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1// SPDX-License-Identifier: GPL-2.0-or-later
2/**************************************************************************/
3/* */
4/* IBM System i and System p Virtual NIC Device Driver */
5/* Copyright (C) 2014 IBM Corp. */
6/* Santiago Leon (santi_leon@yahoo.com) */
7/* Thomas Falcon (tlfalcon@linux.vnet.ibm.com) */
8/* John Allen (jallen@linux.vnet.ibm.com) */
9/* */
10/* */
11/* This module contains the implementation of a virtual ethernet device */
12/* for use with IBM i/p Series LPAR Linux. It utilizes the logical LAN */
13/* option of the RS/6000 Platform Architecture to interface with virtual */
14/* ethernet NICs that are presented to the partition by the hypervisor. */
15/* */
16/* Messages are passed between the VNIC driver and the VNIC server using */
17/* Command/Response Queues (CRQs) and sub CRQs (sCRQs). CRQs are used to */
18/* issue and receive commands that initiate communication with the server */
19/* on driver initialization. Sub CRQs (sCRQs) are similar to CRQs, but */
20/* are used by the driver to notify the server that a packet is */
21/* ready for transmission or that a buffer has been added to receive a */
22/* packet. Subsequently, sCRQs are used by the server to notify the */
23/* driver that a packet transmission has been completed or that a packet */
24/* has been received and placed in a waiting buffer. */
25/* */
26/* In lieu of a more conventional "on-the-fly" DMA mapping strategy in */
27/* which skbs are DMA mapped and immediately unmapped when the transmit */
28/* or receive has been completed, the VNIC driver is required to use */
29/* "long term mapping". This entails that large, continuous DMA mapped */
30/* buffers are allocated on driver initialization and these buffers are */
31/* then continuously reused to pass skbs to and from the VNIC server. */
32/* */
33/**************************************************************************/
34
35#include <linux/module.h>
36#include <linux/moduleparam.h>
37#include <linux/types.h>
38#include <linux/errno.h>
39#include <linux/completion.h>
40#include <linux/ioport.h>
41#include <linux/dma-mapping.h>
42#include <linux/kernel.h>
43#include <linux/netdevice.h>
44#include <linux/etherdevice.h>
45#include <linux/skbuff.h>
46#include <linux/init.h>
47#include <linux/delay.h>
48#include <linux/mm.h>
49#include <linux/ethtool.h>
50#include <linux/proc_fs.h>
51#include <linux/if_arp.h>
52#include <linux/in.h>
53#include <linux/ip.h>
54#include <linux/ipv6.h>
55#include <linux/irq.h>
56#include <linux/irqdomain.h>
57#include <linux/kthread.h>
58#include <linux/seq_file.h>
59#include <linux/interrupt.h>
60#include <net/net_namespace.h>
61#include <asm/hvcall.h>
62#include <linux/atomic.h>
63#include <asm/vio.h>
64#include <asm/xive.h>
65#include <asm/iommu.h>
66#include <linux/uaccess.h>
67#include <asm/firmware.h>
68#include <linux/workqueue.h>
69#include <linux/if_vlan.h>
70#include <linux/utsname.h>
71#include <linux/cpu.h>
72
73#include "ibmvnic.h"
74
75static const char ibmvnic_driver_name[] = "ibmvnic";
76static const char ibmvnic_driver_string[] = "IBM System i/p Virtual NIC Driver";
77
78MODULE_AUTHOR("Santiago Leon");
79MODULE_DESCRIPTION("IBM System i/p Virtual NIC Driver");
80MODULE_LICENSE("GPL");
81MODULE_VERSION(IBMVNIC_DRIVER_VERSION);
82
83static int ibmvnic_version = IBMVNIC_INITIAL_VERSION;
84static void release_sub_crqs(struct ibmvnic_adapter *, bool);
85static int ibmvnic_reset_crq(struct ibmvnic_adapter *);
86static int ibmvnic_send_crq_init(struct ibmvnic_adapter *);
87static int ibmvnic_reenable_crq_queue(struct ibmvnic_adapter *);
88static int ibmvnic_send_crq(struct ibmvnic_adapter *, union ibmvnic_crq *);
89static int send_subcrq_indirect(struct ibmvnic_adapter *, u64, u64, u64);
90static irqreturn_t ibmvnic_interrupt_rx(int irq, void *instance);
91static int enable_scrq_irq(struct ibmvnic_adapter *,
92 struct ibmvnic_sub_crq_queue *);
93static int disable_scrq_irq(struct ibmvnic_adapter *,
94 struct ibmvnic_sub_crq_queue *);
95static int pending_scrq(struct ibmvnic_adapter *,
96 struct ibmvnic_sub_crq_queue *);
97static union sub_crq *ibmvnic_next_scrq(struct ibmvnic_adapter *,
98 struct ibmvnic_sub_crq_queue *);
99static int ibmvnic_poll(struct napi_struct *napi, int data);
100static int reset_sub_crq_queues(struct ibmvnic_adapter *adapter);
101static inline void reinit_init_done(struct ibmvnic_adapter *adapter);
102static void send_query_map(struct ibmvnic_adapter *adapter);
103static int send_request_map(struct ibmvnic_adapter *, dma_addr_t, u32, u8);
104static int send_request_unmap(struct ibmvnic_adapter *, u8);
105static int send_login(struct ibmvnic_adapter *adapter);
106static void send_query_cap(struct ibmvnic_adapter *adapter);
107static int init_sub_crqs(struct ibmvnic_adapter *);
108static int init_sub_crq_irqs(struct ibmvnic_adapter *adapter);
109static int ibmvnic_reset_init(struct ibmvnic_adapter *, bool reset);
110static void release_crq_queue(struct ibmvnic_adapter *);
111static int __ibmvnic_set_mac(struct net_device *, u8 *);
112static int init_crq_queue(struct ibmvnic_adapter *adapter);
113static int send_query_phys_parms(struct ibmvnic_adapter *adapter);
114static void ibmvnic_tx_scrq_clean_buffer(struct ibmvnic_adapter *adapter,
115 struct ibmvnic_sub_crq_queue *tx_scrq);
116static void free_long_term_buff(struct ibmvnic_adapter *adapter,
117 struct ibmvnic_long_term_buff *ltb);
118static void ibmvnic_disable_irqs(struct ibmvnic_adapter *adapter);
119static void flush_reset_queue(struct ibmvnic_adapter *adapter);
120static void print_subcrq_error(struct device *dev, int rc, const char *func);
121
122struct ibmvnic_stat {
123 char name[ETH_GSTRING_LEN];
124 int offset;
125};
126
127#define IBMVNIC_STAT_OFF(stat) (offsetof(struct ibmvnic_adapter, stats) + \
128 offsetof(struct ibmvnic_statistics, stat))
129#define IBMVNIC_GET_STAT(a, off) (*((u64 *)(((unsigned long)(a)) + (off))))
130
131static const struct ibmvnic_stat ibmvnic_stats[] = {
132 {"rx_packets", IBMVNIC_STAT_OFF(rx_packets)},
133 {"rx_bytes", IBMVNIC_STAT_OFF(rx_bytes)},
134 {"tx_packets", IBMVNIC_STAT_OFF(tx_packets)},
135 {"tx_bytes", IBMVNIC_STAT_OFF(tx_bytes)},
136 {"ucast_tx_packets", IBMVNIC_STAT_OFF(ucast_tx_packets)},
137 {"ucast_rx_packets", IBMVNIC_STAT_OFF(ucast_rx_packets)},
138 {"mcast_tx_packets", IBMVNIC_STAT_OFF(mcast_tx_packets)},
139 {"mcast_rx_packets", IBMVNIC_STAT_OFF(mcast_rx_packets)},
140 {"bcast_tx_packets", IBMVNIC_STAT_OFF(bcast_tx_packets)},
141 {"bcast_rx_packets", IBMVNIC_STAT_OFF(bcast_rx_packets)},
142 {"align_errors", IBMVNIC_STAT_OFF(align_errors)},
143 {"fcs_errors", IBMVNIC_STAT_OFF(fcs_errors)},
144 {"single_collision_frames", IBMVNIC_STAT_OFF(single_collision_frames)},
145 {"multi_collision_frames", IBMVNIC_STAT_OFF(multi_collision_frames)},
146 {"sqe_test_errors", IBMVNIC_STAT_OFF(sqe_test_errors)},
147 {"deferred_tx", IBMVNIC_STAT_OFF(deferred_tx)},
148 {"late_collisions", IBMVNIC_STAT_OFF(late_collisions)},
149 {"excess_collisions", IBMVNIC_STAT_OFF(excess_collisions)},
150 {"internal_mac_tx_errors", IBMVNIC_STAT_OFF(internal_mac_tx_errors)},
151 {"carrier_sense", IBMVNIC_STAT_OFF(carrier_sense)},
152 {"too_long_frames", IBMVNIC_STAT_OFF(too_long_frames)},
153 {"internal_mac_rx_errors", IBMVNIC_STAT_OFF(internal_mac_rx_errors)},
154};
155
156static int send_crq_init_complete(struct ibmvnic_adapter *adapter)
157{
158 union ibmvnic_crq crq;
159
160 memset(&crq, 0, sizeof(crq));
161 crq.generic.first = IBMVNIC_CRQ_INIT_CMD;
162 crq.generic.cmd = IBMVNIC_CRQ_INIT_COMPLETE;
163
164 return ibmvnic_send_crq(adapter, &crq);
165}
166
167static int send_version_xchg(struct ibmvnic_adapter *adapter)
168{
169 union ibmvnic_crq crq;
170
171 memset(&crq, 0, sizeof(crq));
172 crq.version_exchange.first = IBMVNIC_CRQ_CMD;
173 crq.version_exchange.cmd = VERSION_EXCHANGE;
174 crq.version_exchange.version = cpu_to_be16(ibmvnic_version);
175
176 return ibmvnic_send_crq(adapter, &crq);
177}
178
179static void ibmvnic_clean_queue_affinity(struct ibmvnic_adapter *adapter,
180 struct ibmvnic_sub_crq_queue *queue)
181{
182 if (!(queue && queue->irq))
183 return;
184
185 cpumask_clear(queue->affinity_mask);
186
187 if (irq_set_affinity_and_hint(queue->irq, NULL))
188 netdev_warn(adapter->netdev,
189 "%s: Clear affinity failed, queue addr = %p, IRQ = %d\n",
190 __func__, queue, queue->irq);
191}
192
193static void ibmvnic_clean_affinity(struct ibmvnic_adapter *adapter)
194{
195 struct ibmvnic_sub_crq_queue **rxqs;
196 struct ibmvnic_sub_crq_queue **txqs;
197 int num_rxqs, num_txqs;
198 int i;
199
200 rxqs = adapter->rx_scrq;
201 txqs = adapter->tx_scrq;
202 num_txqs = adapter->num_active_tx_scrqs;
203 num_rxqs = adapter->num_active_rx_scrqs;
204
205 netdev_dbg(adapter->netdev, "%s: Cleaning irq affinity hints", __func__);
206 if (txqs) {
207 for (i = 0; i < num_txqs; i++)
208 ibmvnic_clean_queue_affinity(adapter, txqs[i]);
209 }
210 if (rxqs) {
211 for (i = 0; i < num_rxqs; i++)
212 ibmvnic_clean_queue_affinity(adapter, rxqs[i]);
213 }
214}
215
216static int ibmvnic_set_queue_affinity(struct ibmvnic_sub_crq_queue *queue,
217 unsigned int *cpu, int *stragglers,
218 int stride)
219{
220 cpumask_var_t mask;
221 int i;
222 int rc = 0;
223
224 if (!(queue && queue->irq))
225 return rc;
226
227 /* cpumask_var_t is either a pointer or array, allocation works here */
228 if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
229 return -ENOMEM;
230
231 /* while we have extra cpu give one extra to this irq */
232 if (*stragglers) {
233 stride++;
234 (*stragglers)--;
235 }
236 /* atomic write is safer than writing bit by bit directly */
237 for (i = 0; i < stride; i++) {
238 cpumask_set_cpu(*cpu, mask);
239 *cpu = cpumask_next_wrap(*cpu, cpu_online_mask,
240 nr_cpu_ids, false);
241 }
242 /* set queue affinity mask */
243 cpumask_copy(queue->affinity_mask, mask);
244 rc = irq_set_affinity_and_hint(queue->irq, queue->affinity_mask);
245 free_cpumask_var(mask);
246
247 return rc;
248}
249
250/* assumes cpu read lock is held */
251static void ibmvnic_set_affinity(struct ibmvnic_adapter *adapter)
252{
253 struct ibmvnic_sub_crq_queue **rxqs = adapter->rx_scrq;
254 struct ibmvnic_sub_crq_queue **txqs = adapter->tx_scrq;
255 struct ibmvnic_sub_crq_queue *queue;
256 int num_rxqs = adapter->num_active_rx_scrqs, i_rxqs = 0;
257 int num_txqs = adapter->num_active_tx_scrqs, i_txqs = 0;
258 int total_queues, stride, stragglers, i;
259 unsigned int num_cpu, cpu;
260 bool is_rx_queue;
261 int rc = 0;
262
263 netdev_dbg(adapter->netdev, "%s: Setting irq affinity hints", __func__);
264 if (!(adapter->rx_scrq && adapter->tx_scrq)) {
265 netdev_warn(adapter->netdev,
266 "%s: Set affinity failed, queues not allocated\n",
267 __func__);
268 return;
269 }
270
271 total_queues = num_rxqs + num_txqs;
272 num_cpu = num_online_cpus();
273 /* number of cpu's assigned per irq */
274 stride = max_t(int, num_cpu / total_queues, 1);
275 /* number of leftover cpu's */
276 stragglers = num_cpu >= total_queues ? num_cpu % total_queues : 0;
277 /* next available cpu to assign irq to */
278 cpu = cpumask_next(-1, cpu_online_mask);
279
280 for (i = 0; i < total_queues; i++) {
281 is_rx_queue = false;
282 /* balance core load by alternating rx and tx assignments
283 * ex: TX0 -> RX0 -> TX1 -> RX1 etc.
284 */
285 if ((i % 2 == 1 && i_rxqs < num_rxqs) || i_txqs == num_txqs) {
286 queue = rxqs[i_rxqs++];
287 is_rx_queue = true;
288 } else {
289 queue = txqs[i_txqs++];
290 }
291
292 rc = ibmvnic_set_queue_affinity(queue, &cpu, &stragglers,
293 stride);
294 if (rc)
295 goto out;
296
297 if (!queue || is_rx_queue)
298 continue;
299
300 rc = __netif_set_xps_queue(adapter->netdev,
301 cpumask_bits(queue->affinity_mask),
302 i_txqs - 1, XPS_CPUS);
303 if (rc)
304 netdev_warn(adapter->netdev, "%s: Set XPS on queue %d failed, rc = %d.\n",
305 __func__, i_txqs - 1, rc);
306 }
307
308out:
309 if (rc) {
310 netdev_warn(adapter->netdev,
311 "%s: Set affinity failed, queue addr = %p, IRQ = %d, rc = %d.\n",
312 __func__, queue, queue->irq, rc);
313 ibmvnic_clean_affinity(adapter);
314 }
315}
316
317static int ibmvnic_cpu_online(unsigned int cpu, struct hlist_node *node)
318{
319 struct ibmvnic_adapter *adapter;
320
321 adapter = hlist_entry_safe(node, struct ibmvnic_adapter, node);
322 ibmvnic_set_affinity(adapter);
323 return 0;
324}
325
326static int ibmvnic_cpu_dead(unsigned int cpu, struct hlist_node *node)
327{
328 struct ibmvnic_adapter *adapter;
329
330 adapter = hlist_entry_safe(node, struct ibmvnic_adapter, node_dead);
331 ibmvnic_set_affinity(adapter);
332 return 0;
333}
334
335static int ibmvnic_cpu_down_prep(unsigned int cpu, struct hlist_node *node)
336{
337 struct ibmvnic_adapter *adapter;
338
339 adapter = hlist_entry_safe(node, struct ibmvnic_adapter, node);
340 ibmvnic_clean_affinity(adapter);
341 return 0;
342}
343
344static enum cpuhp_state ibmvnic_online;
345
346static int ibmvnic_cpu_notif_add(struct ibmvnic_adapter *adapter)
347{
348 int ret;
349
350 ret = cpuhp_state_add_instance_nocalls(ibmvnic_online, &adapter->node);
351 if (ret)
352 return ret;
353 ret = cpuhp_state_add_instance_nocalls(CPUHP_IBMVNIC_DEAD,
354 &adapter->node_dead);
355 if (!ret)
356 return ret;
357 cpuhp_state_remove_instance_nocalls(ibmvnic_online, &adapter->node);
358 return ret;
359}
360
361static void ibmvnic_cpu_notif_remove(struct ibmvnic_adapter *adapter)
362{
363 cpuhp_state_remove_instance_nocalls(ibmvnic_online, &adapter->node);
364 cpuhp_state_remove_instance_nocalls(CPUHP_IBMVNIC_DEAD,
365 &adapter->node_dead);
366}
367
368static long h_reg_sub_crq(unsigned long unit_address, unsigned long token,
369 unsigned long length, unsigned long *number,
370 unsigned long *irq)
371{
372 unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
373 long rc;
374
375 rc = plpar_hcall(H_REG_SUB_CRQ, retbuf, unit_address, token, length);
376 *number = retbuf[0];
377 *irq = retbuf[1];
378
379 return rc;
380}
381
382/**
383 * ibmvnic_wait_for_completion - Check device state and wait for completion
384 * @adapter: private device data
385 * @comp_done: completion structure to wait for
386 * @timeout: time to wait in milliseconds
387 *
388 * Wait for a completion signal or until the timeout limit is reached
389 * while checking that the device is still active.
390 */
391static int ibmvnic_wait_for_completion(struct ibmvnic_adapter *adapter,
392 struct completion *comp_done,
393 unsigned long timeout)
394{
395 struct net_device *netdev;
396 unsigned long div_timeout;
397 u8 retry;
398
399 netdev = adapter->netdev;
400 retry = 5;
401 div_timeout = msecs_to_jiffies(timeout / retry);
402 while (true) {
403 if (!adapter->crq.active) {
404 netdev_err(netdev, "Device down!\n");
405 return -ENODEV;
406 }
407 if (!retry--)
408 break;
409 if (wait_for_completion_timeout(comp_done, div_timeout))
410 return 0;
411 }
412 netdev_err(netdev, "Operation timed out.\n");
413 return -ETIMEDOUT;
414}
415
416/**
417 * reuse_ltb() - Check if a long term buffer can be reused
418 * @ltb: The long term buffer to be checked
419 * @size: The size of the long term buffer.
420 *
421 * An LTB can be reused unless its size has changed.
422 *
423 * Return: Return true if the LTB can be reused, false otherwise.
424 */
425static bool reuse_ltb(struct ibmvnic_long_term_buff *ltb, int size)
426{
427 return (ltb->buff && ltb->size == size);
428}
429
430/**
431 * alloc_long_term_buff() - Allocate a long term buffer (LTB)
432 *
433 * @adapter: ibmvnic adapter associated to the LTB
434 * @ltb: container object for the LTB
435 * @size: size of the LTB
436 *
437 * Allocate an LTB of the specified size and notify VIOS.
438 *
439 * If the given @ltb already has the correct size, reuse it. Otherwise if
440 * its non-NULL, free it. Then allocate a new one of the correct size.
441 * Notify the VIOS either way since we may now be working with a new VIOS.
442 *
443 * Allocating larger chunks of memory during resets, specially LPM or under
444 * low memory situations can cause resets to fail/timeout and for LPAR to
445 * lose connectivity. So hold onto the LTB even if we fail to communicate
446 * with the VIOS and reuse it on next open. Free LTB when adapter is closed.
447 *
448 * Return: 0 if we were able to allocate the LTB and notify the VIOS and
449 * a negative value otherwise.
450 */
451static int alloc_long_term_buff(struct ibmvnic_adapter *adapter,
452 struct ibmvnic_long_term_buff *ltb, int size)
453{
454 struct device *dev = &adapter->vdev->dev;
455 u64 prev = 0;
456 int rc;
457
458 if (!reuse_ltb(ltb, size)) {
459 dev_dbg(dev,
460 "LTB size changed from 0x%llx to 0x%x, reallocating\n",
461 ltb->size, size);
462 prev = ltb->size;
463 free_long_term_buff(adapter, ltb);
464 }
465
466 if (ltb->buff) {
467 dev_dbg(dev, "Reusing LTB [map %d, size 0x%llx]\n",
468 ltb->map_id, ltb->size);
469 } else {
470 ltb->buff = dma_alloc_coherent(dev, size, <b->addr,
471 GFP_KERNEL);
472 if (!ltb->buff) {
473 dev_err(dev, "Couldn't alloc long term buffer\n");
474 return -ENOMEM;
475 }
476 ltb->size = size;
477
478 ltb->map_id = find_first_zero_bit(adapter->map_ids,
479 MAX_MAP_ID);
480 bitmap_set(adapter->map_ids, ltb->map_id, 1);
481
482 dev_dbg(dev,
483 "Allocated new LTB [map %d, size 0x%llx was 0x%llx]\n",
484 ltb->map_id, ltb->size, prev);
485 }
486
487 /* Ensure ltb is zeroed - specially when reusing it. */
488 memset(ltb->buff, 0, ltb->size);
489
490 mutex_lock(&adapter->fw_lock);
491 adapter->fw_done_rc = 0;
492 reinit_completion(&adapter->fw_done);
493
494 rc = send_request_map(adapter, ltb->addr, ltb->size, ltb->map_id);
495 if (rc) {
496 dev_err(dev, "send_request_map failed, rc = %d\n", rc);
497 goto out;
498 }
499
500 rc = ibmvnic_wait_for_completion(adapter, &adapter->fw_done, 10000);
501 if (rc) {
502 dev_err(dev, "LTB map request aborted or timed out, rc = %d\n",
503 rc);
504 goto out;
505 }
506
507 if (adapter->fw_done_rc) {
508 dev_err(dev, "Couldn't map LTB, rc = %d\n",
509 adapter->fw_done_rc);
510 rc = -EIO;
511 goto out;
512 }
513 rc = 0;
514out:
515 /* don't free LTB on communication error - see function header */
516 mutex_unlock(&adapter->fw_lock);
517 return rc;
518}
519
520static void free_long_term_buff(struct ibmvnic_adapter *adapter,
521 struct ibmvnic_long_term_buff *ltb)
522{
523 struct device *dev = &adapter->vdev->dev;
524
525 if (!ltb->buff)
526 return;
527
528 /* VIOS automatically unmaps the long term buffer at remote
529 * end for the following resets:
530 * FAILOVER, MOBILITY, TIMEOUT.
531 */
532 if (adapter->reset_reason != VNIC_RESET_FAILOVER &&
533 adapter->reset_reason != VNIC_RESET_MOBILITY &&
534 adapter->reset_reason != VNIC_RESET_TIMEOUT)
535 send_request_unmap(adapter, ltb->map_id);
536
537 dma_free_coherent(dev, ltb->size, ltb->buff, ltb->addr);
538
539 ltb->buff = NULL;
540 /* mark this map_id free */
541 bitmap_clear(adapter->map_ids, ltb->map_id, 1);
542 ltb->map_id = 0;
543}
544
545/**
546 * free_ltb_set - free the given set of long term buffers (LTBS)
547 * @adapter: The ibmvnic adapter containing this ltb set
548 * @ltb_set: The ltb_set to be freed
549 *
550 * Free the set of LTBs in the given set.
551 */
552
553static void free_ltb_set(struct ibmvnic_adapter *adapter,
554 struct ibmvnic_ltb_set *ltb_set)
555{
556 int i;
557
558 for (i = 0; i < ltb_set->num_ltbs; i++)
559 free_long_term_buff(adapter, <b_set->ltbs[i]);
560
561 kfree(ltb_set->ltbs);
562 ltb_set->ltbs = NULL;
563 ltb_set->num_ltbs = 0;
564}
565
566/**
567 * alloc_ltb_set() - Allocate a set of long term buffers (LTBs)
568 *
569 * @adapter: ibmvnic adapter associated to the LTB
570 * @ltb_set: container object for the set of LTBs
571 * @num_buffs: Number of buffers in the LTB
572 * @buff_size: Size of each buffer in the LTB
573 *
574 * Allocate a set of LTBs to accommodate @num_buffs buffers of @buff_size
575 * each. We currently cap size each LTB to IBMVNIC_ONE_LTB_SIZE. If the
576 * new set of LTBs have fewer LTBs than the old set, free the excess LTBs.
577 * If new set needs more than in old set, allocate the remaining ones.
578 * Try and reuse as many LTBs as possible and avoid reallocation.
579 *
580 * Any changes to this allocation strategy must be reflected in
581 * map_rxpool_buff_to_ltb() and map_txpool_buff_to_ltb().
582 */
583static int alloc_ltb_set(struct ibmvnic_adapter *adapter,
584 struct ibmvnic_ltb_set *ltb_set, int num_buffs,
585 int buff_size)
586{
587 struct device *dev = &adapter->vdev->dev;
588 struct ibmvnic_ltb_set old_set;
589 struct ibmvnic_ltb_set new_set;
590 int rem_size;
591 int tot_size; /* size of all ltbs */
592 int ltb_size; /* size of one ltb */
593 int nltbs;
594 int rc;
595 int n;
596 int i;
597
598 dev_dbg(dev, "%s() num_buffs %d, buff_size %d\n", __func__, num_buffs,
599 buff_size);
600
601 ltb_size = rounddown(IBMVNIC_ONE_LTB_SIZE, buff_size);
602 tot_size = num_buffs * buff_size;
603
604 if (ltb_size > tot_size)
605 ltb_size = tot_size;
606
607 nltbs = tot_size / ltb_size;
608 if (tot_size % ltb_size)
609 nltbs++;
610
611 old_set = *ltb_set;
612
613 if (old_set.num_ltbs == nltbs) {
614 new_set = old_set;
615 } else {
616 int tmp = nltbs * sizeof(struct ibmvnic_long_term_buff);
617
618 new_set.ltbs = kzalloc(tmp, GFP_KERNEL);
619 if (!new_set.ltbs)
620 return -ENOMEM;
621
622 new_set.num_ltbs = nltbs;
623
624 /* Free any excess ltbs in old set */
625 for (i = new_set.num_ltbs; i < old_set.num_ltbs; i++)
626 free_long_term_buff(adapter, &old_set.ltbs[i]);
627
628 /* Copy remaining ltbs to new set. All LTBs except the
629 * last one are of the same size. alloc_long_term_buff()
630 * will realloc if the size changes.
631 */
632 n = min(old_set.num_ltbs, new_set.num_ltbs);
633 for (i = 0; i < n; i++)
634 new_set.ltbs[i] = old_set.ltbs[i];
635
636 /* Any additional ltbs in new set will have NULL ltbs for
637 * now and will be allocated in alloc_long_term_buff().
638 */
639
640 /* We no longer need the old_set so free it. Note that we
641 * may have reused some ltbs from old set and freed excess
642 * ltbs above. So we only need to free the container now
643 * not the LTBs themselves. (i.e. dont free_ltb_set()!)
644 */
645 kfree(old_set.ltbs);
646 old_set.ltbs = NULL;
647 old_set.num_ltbs = 0;
648
649 /* Install the new set. If allocations fail below, we will
650 * retry later and know what size LTBs we need.
651 */
652 *ltb_set = new_set;
653 }
654
655 i = 0;
656 rem_size = tot_size;
657 while (rem_size) {
658 if (ltb_size > rem_size)
659 ltb_size = rem_size;
660
661 rem_size -= ltb_size;
662
663 rc = alloc_long_term_buff(adapter, &new_set.ltbs[i], ltb_size);
664 if (rc)
665 goto out;
666 i++;
667 }
668
669 WARN_ON(i != new_set.num_ltbs);
670
671 return 0;
672out:
673 /* We may have allocated one/more LTBs before failing and we
674 * want to try and reuse on next reset. So don't free ltb set.
675 */
676 return rc;
677}
678
679/**
680 * map_rxpool_buf_to_ltb - Map given rxpool buffer to offset in an LTB.
681 * @rxpool: The receive buffer pool containing buffer
682 * @bufidx: Index of buffer in rxpool
683 * @ltbp: (Output) pointer to the long term buffer containing the buffer
684 * @offset: (Output) offset of buffer in the LTB from @ltbp
685 *
686 * Map the given buffer identified by [rxpool, bufidx] to an LTB in the
687 * pool and its corresponding offset. Assume for now that each LTB is of
688 * different size but could possibly be optimized based on the allocation
689 * strategy in alloc_ltb_set().
690 */
691static void map_rxpool_buf_to_ltb(struct ibmvnic_rx_pool *rxpool,
692 unsigned int bufidx,
693 struct ibmvnic_long_term_buff **ltbp,
694 unsigned int *offset)
695{
696 struct ibmvnic_long_term_buff *ltb;
697 int nbufs; /* # of buffers in one ltb */
698 int i;
699
700 WARN_ON(bufidx >= rxpool->size);
701
702 for (i = 0; i < rxpool->ltb_set.num_ltbs; i++) {
703 ltb = &rxpool->ltb_set.ltbs[i];
704 nbufs = ltb->size / rxpool->buff_size;
705 if (bufidx < nbufs)
706 break;
707 bufidx -= nbufs;
708 }
709
710 *ltbp = ltb;
711 *offset = bufidx * rxpool->buff_size;
712}
713
714/**
715 * map_txpool_buf_to_ltb - Map given txpool buffer to offset in an LTB.
716 * @txpool: The transmit buffer pool containing buffer
717 * @bufidx: Index of buffer in txpool
718 * @ltbp: (Output) pointer to the long term buffer (LTB) containing the buffer
719 * @offset: (Output) offset of buffer in the LTB from @ltbp
720 *
721 * Map the given buffer identified by [txpool, bufidx] to an LTB in the
722 * pool and its corresponding offset.
723 */
724static void map_txpool_buf_to_ltb(struct ibmvnic_tx_pool *txpool,
725 unsigned int bufidx,
726 struct ibmvnic_long_term_buff **ltbp,
727 unsigned int *offset)
728{
729 struct ibmvnic_long_term_buff *ltb;
730 int nbufs; /* # of buffers in one ltb */
731 int i;
732
733 WARN_ON_ONCE(bufidx >= txpool->num_buffers);
734
735 for (i = 0; i < txpool->ltb_set.num_ltbs; i++) {
736 ltb = &txpool->ltb_set.ltbs[i];
737 nbufs = ltb->size / txpool->buf_size;
738 if (bufidx < nbufs)
739 break;
740 bufidx -= nbufs;
741 }
742
743 *ltbp = ltb;
744 *offset = bufidx * txpool->buf_size;
745}
746
747static void deactivate_rx_pools(struct ibmvnic_adapter *adapter)
748{
749 int i;
750
751 for (i = 0; i < adapter->num_active_rx_pools; i++)
752 adapter->rx_pool[i].active = 0;
753}
754
755static void replenish_rx_pool(struct ibmvnic_adapter *adapter,
756 struct ibmvnic_rx_pool *pool)
757{
758 int count = pool->size - atomic_read(&pool->available);
759 u64 handle = adapter->rx_scrq[pool->index]->handle;
760 struct device *dev = &adapter->vdev->dev;
761 struct ibmvnic_ind_xmit_queue *ind_bufp;
762 struct ibmvnic_sub_crq_queue *rx_scrq;
763 struct ibmvnic_long_term_buff *ltb;
764 union sub_crq *sub_crq;
765 int buffers_added = 0;
766 unsigned long lpar_rc;
767 struct sk_buff *skb;
768 unsigned int offset;
769 dma_addr_t dma_addr;
770 unsigned char *dst;
771 int shift = 0;
772 int bufidx;
773 int i;
774
775 if (!pool->active)
776 return;
777
778 rx_scrq = adapter->rx_scrq[pool->index];
779 ind_bufp = &rx_scrq->ind_buf;
780
781 /* netdev_skb_alloc() could have failed after we saved a few skbs
782 * in the indir_buf and we would not have sent them to VIOS yet.
783 * To account for them, start the loop at ind_bufp->index rather
784 * than 0. If we pushed all the skbs to VIOS, ind_bufp->index will
785 * be 0.
786 */
787 for (i = ind_bufp->index; i < count; ++i) {
788 bufidx = pool->free_map[pool->next_free];
789
790 /* We maybe reusing the skb from earlier resets. Allocate
791 * only if necessary. But since the LTB may have changed
792 * during reset (see init_rx_pools()), update LTB below
793 * even if reusing skb.
794 */
795 skb = pool->rx_buff[bufidx].skb;
796 if (!skb) {
797 skb = netdev_alloc_skb(adapter->netdev,
798 pool->buff_size);
799 if (!skb) {
800 dev_err(dev, "Couldn't replenish rx buff\n");
801 adapter->replenish_no_mem++;
802 break;
803 }
804 }
805
806 pool->free_map[pool->next_free] = IBMVNIC_INVALID_MAP;
807 pool->next_free = (pool->next_free + 1) % pool->size;
808
809 /* Copy the skb to the long term mapped DMA buffer */
810 map_rxpool_buf_to_ltb(pool, bufidx, <b, &offset);
811 dst = ltb->buff + offset;
812 memset(dst, 0, pool->buff_size);
813 dma_addr = ltb->addr + offset;
814
815 /* add the skb to an rx_buff in the pool */
816 pool->rx_buff[bufidx].data = dst;
817 pool->rx_buff[bufidx].dma = dma_addr;
818 pool->rx_buff[bufidx].skb = skb;
819 pool->rx_buff[bufidx].pool_index = pool->index;
820 pool->rx_buff[bufidx].size = pool->buff_size;
821
822 /* queue the rx_buff for the next send_subcrq_indirect */
823 sub_crq = &ind_bufp->indir_arr[ind_bufp->index++];
824 memset(sub_crq, 0, sizeof(*sub_crq));
825 sub_crq->rx_add.first = IBMVNIC_CRQ_CMD;
826 sub_crq->rx_add.correlator =
827 cpu_to_be64((u64)&pool->rx_buff[bufidx]);
828 sub_crq->rx_add.ioba = cpu_to_be32(dma_addr);
829 sub_crq->rx_add.map_id = ltb->map_id;
830
831 /* The length field of the sCRQ is defined to be 24 bits so the
832 * buffer size needs to be left shifted by a byte before it is
833 * converted to big endian to prevent the last byte from being
834 * truncated.
835 */
836#ifdef __LITTLE_ENDIAN__
837 shift = 8;
838#endif
839 sub_crq->rx_add.len = cpu_to_be32(pool->buff_size << shift);
840
841 /* if send_subcrq_indirect queue is full, flush to VIOS */
842 if (ind_bufp->index == IBMVNIC_MAX_IND_DESCS ||
843 i == count - 1) {
844 lpar_rc =
845 send_subcrq_indirect(adapter, handle,
846 (u64)ind_bufp->indir_dma,
847 (u64)ind_bufp->index);
848 if (lpar_rc != H_SUCCESS)
849 goto failure;
850 buffers_added += ind_bufp->index;
851 adapter->replenish_add_buff_success += ind_bufp->index;
852 ind_bufp->index = 0;
853 }
854 }
855 atomic_add(buffers_added, &pool->available);
856 return;
857
858failure:
859 if (lpar_rc != H_PARAMETER && lpar_rc != H_CLOSED)
860 dev_err_ratelimited(dev, "rx: replenish packet buffer failed\n");
861 for (i = ind_bufp->index - 1; i >= 0; --i) {
862 struct ibmvnic_rx_buff *rx_buff;
863
864 pool->next_free = pool->next_free == 0 ?
865 pool->size - 1 : pool->next_free - 1;
866 sub_crq = &ind_bufp->indir_arr[i];
867 rx_buff = (struct ibmvnic_rx_buff *)
868 be64_to_cpu(sub_crq->rx_add.correlator);
869 bufidx = (int)(rx_buff - pool->rx_buff);
870 pool->free_map[pool->next_free] = bufidx;
871 dev_kfree_skb_any(pool->rx_buff[bufidx].skb);
872 pool->rx_buff[bufidx].skb = NULL;
873 }
874 adapter->replenish_add_buff_failure += ind_bufp->index;
875 atomic_add(buffers_added, &pool->available);
876 ind_bufp->index = 0;
877 if (lpar_rc == H_CLOSED || adapter->failover_pending) {
878 /* Disable buffer pool replenishment and report carrier off if
879 * queue is closed or pending failover.
880 * Firmware guarantees that a signal will be sent to the
881 * driver, triggering a reset.
882 */
883 deactivate_rx_pools(adapter);
884 netif_carrier_off(adapter->netdev);
885 }
886}
887
888static void replenish_pools(struct ibmvnic_adapter *adapter)
889{
890 int i;
891
892 adapter->replenish_task_cycles++;
893 for (i = 0; i < adapter->num_active_rx_pools; i++) {
894 if (adapter->rx_pool[i].active)
895 replenish_rx_pool(adapter, &adapter->rx_pool[i]);
896 }
897
898 netdev_dbg(adapter->netdev, "Replenished %d pools\n", i);
899}
900
901static void release_stats_buffers(struct ibmvnic_adapter *adapter)
902{
903 kfree(adapter->tx_stats_buffers);
904 kfree(adapter->rx_stats_buffers);
905 adapter->tx_stats_buffers = NULL;
906 adapter->rx_stats_buffers = NULL;
907}
908
909static int init_stats_buffers(struct ibmvnic_adapter *adapter)
910{
911 adapter->tx_stats_buffers =
912 kcalloc(IBMVNIC_MAX_QUEUES,
913 sizeof(struct ibmvnic_tx_queue_stats),
914 GFP_KERNEL);
915 if (!adapter->tx_stats_buffers)
916 return -ENOMEM;
917
918 adapter->rx_stats_buffers =
919 kcalloc(IBMVNIC_MAX_QUEUES,
920 sizeof(struct ibmvnic_rx_queue_stats),
921 GFP_KERNEL);
922 if (!adapter->rx_stats_buffers)
923 return -ENOMEM;
924
925 return 0;
926}
927
928static void release_stats_token(struct ibmvnic_adapter *adapter)
929{
930 struct device *dev = &adapter->vdev->dev;
931
932 if (!adapter->stats_token)
933 return;
934
935 dma_unmap_single(dev, adapter->stats_token,
936 sizeof(struct ibmvnic_statistics),
937 DMA_FROM_DEVICE);
938 adapter->stats_token = 0;
939}
940
941static int init_stats_token(struct ibmvnic_adapter *adapter)
942{
943 struct device *dev = &adapter->vdev->dev;
944 dma_addr_t stok;
945 int rc;
946
947 stok = dma_map_single(dev, &adapter->stats,
948 sizeof(struct ibmvnic_statistics),
949 DMA_FROM_DEVICE);
950 rc = dma_mapping_error(dev, stok);
951 if (rc) {
952 dev_err(dev, "Couldn't map stats buffer, rc = %d\n", rc);
953 return rc;
954 }
955
956 adapter->stats_token = stok;
957 netdev_dbg(adapter->netdev, "Stats token initialized (%llx)\n", stok);
958 return 0;
959}
960
961/**
962 * release_rx_pools() - Release any rx pools attached to @adapter.
963 * @adapter: ibmvnic adapter
964 *
965 * Safe to call this multiple times - even if no pools are attached.
966 */
967static void release_rx_pools(struct ibmvnic_adapter *adapter)
968{
969 struct ibmvnic_rx_pool *rx_pool;
970 int i, j;
971
972 if (!adapter->rx_pool)
973 return;
974
975 for (i = 0; i < adapter->num_active_rx_pools; i++) {
976 rx_pool = &adapter->rx_pool[i];
977
978 netdev_dbg(adapter->netdev, "Releasing rx_pool[%d]\n", i);
979
980 kfree(rx_pool->free_map);
981
982 free_ltb_set(adapter, &rx_pool->ltb_set);
983
984 if (!rx_pool->rx_buff)
985 continue;
986
987 for (j = 0; j < rx_pool->size; j++) {
988 if (rx_pool->rx_buff[j].skb) {
989 dev_kfree_skb_any(rx_pool->rx_buff[j].skb);
990 rx_pool->rx_buff[j].skb = NULL;
991 }
992 }
993
994 kfree(rx_pool->rx_buff);
995 }
996
997 kfree(adapter->rx_pool);
998 adapter->rx_pool = NULL;
999 adapter->num_active_rx_pools = 0;
1000 adapter->prev_rx_pool_size = 0;
1001}
1002
1003/**
1004 * reuse_rx_pools() - Check if the existing rx pools can be reused.
1005 * @adapter: ibmvnic adapter
1006 *
1007 * Check if the existing rx pools in the adapter can be reused. The
1008 * pools can be reused if the pool parameters (number of pools,
1009 * number of buffers in the pool and size of each buffer) have not
1010 * changed.
1011 *
1012 * NOTE: This assumes that all pools have the same number of buffers
1013 * which is the case currently. If that changes, we must fix this.
1014 *
1015 * Return: true if the rx pools can be reused, false otherwise.
1016 */
1017static bool reuse_rx_pools(struct ibmvnic_adapter *adapter)
1018{
1019 u64 old_num_pools, new_num_pools;
1020 u64 old_pool_size, new_pool_size;
1021 u64 old_buff_size, new_buff_size;
1022
1023 if (!adapter->rx_pool)
1024 return false;
1025
1026 old_num_pools = adapter->num_active_rx_pools;
1027 new_num_pools = adapter->req_rx_queues;
1028
1029 old_pool_size = adapter->prev_rx_pool_size;
1030 new_pool_size = adapter->req_rx_add_entries_per_subcrq;
1031
1032 old_buff_size = adapter->prev_rx_buf_sz;
1033 new_buff_size = adapter->cur_rx_buf_sz;
1034
1035 if (old_buff_size != new_buff_size ||
1036 old_num_pools != new_num_pools ||
1037 old_pool_size != new_pool_size)
1038 return false;
1039
1040 return true;
1041}
1042
1043/**
1044 * init_rx_pools(): Initialize the set of receiver pools in the adapter.
1045 * @netdev: net device associated with the vnic interface
1046 *
1047 * Initialize the set of receiver pools in the ibmvnic adapter associated
1048 * with the net_device @netdev. If possible, reuse the existing rx pools.
1049 * Otherwise free any existing pools and allocate a new set of pools
1050 * before initializing them.
1051 *
1052 * Return: 0 on success and negative value on error.
1053 */
1054static int init_rx_pools(struct net_device *netdev)
1055{
1056 struct ibmvnic_adapter *adapter = netdev_priv(netdev);
1057 struct device *dev = &adapter->vdev->dev;
1058 struct ibmvnic_rx_pool *rx_pool;
1059 u64 num_pools;
1060 u64 pool_size; /* # of buffers in one pool */
1061 u64 buff_size;
1062 int i, j, rc;
1063
1064 pool_size = adapter->req_rx_add_entries_per_subcrq;
1065 num_pools = adapter->req_rx_queues;
1066 buff_size = adapter->cur_rx_buf_sz;
1067
1068 if (reuse_rx_pools(adapter)) {
1069 dev_dbg(dev, "Reusing rx pools\n");
1070 goto update_ltb;
1071 }
1072
1073 /* Allocate/populate the pools. */
1074 release_rx_pools(adapter);
1075
1076 adapter->rx_pool = kcalloc(num_pools,
1077 sizeof(struct ibmvnic_rx_pool),
1078 GFP_KERNEL);
1079 if (!adapter->rx_pool) {
1080 dev_err(dev, "Failed to allocate rx pools\n");
1081 return -ENOMEM;
1082 }
1083
1084 /* Set num_active_rx_pools early. If we fail below after partial
1085 * allocation, release_rx_pools() will know how many to look for.
1086 */
1087 adapter->num_active_rx_pools = num_pools;
1088
1089 for (i = 0; i < num_pools; i++) {
1090 rx_pool = &adapter->rx_pool[i];
1091
1092 netdev_dbg(adapter->netdev,
1093 "Initializing rx_pool[%d], %lld buffs, %lld bytes each\n",
1094 i, pool_size, buff_size);
1095
1096 rx_pool->size = pool_size;
1097 rx_pool->index = i;
1098 rx_pool->buff_size = ALIGN(buff_size, L1_CACHE_BYTES);
1099
1100 rx_pool->free_map = kcalloc(rx_pool->size, sizeof(int),
1101 GFP_KERNEL);
1102 if (!rx_pool->free_map) {
1103 dev_err(dev, "Couldn't alloc free_map %d\n", i);
1104 rc = -ENOMEM;
1105 goto out_release;
1106 }
1107
1108 rx_pool->rx_buff = kcalloc(rx_pool->size,
1109 sizeof(struct ibmvnic_rx_buff),
1110 GFP_KERNEL);
1111 if (!rx_pool->rx_buff) {
1112 dev_err(dev, "Couldn't alloc rx buffers\n");
1113 rc = -ENOMEM;
1114 goto out_release;
1115 }
1116 }
1117
1118 adapter->prev_rx_pool_size = pool_size;
1119 adapter->prev_rx_buf_sz = adapter->cur_rx_buf_sz;
1120
1121update_ltb:
1122 for (i = 0; i < num_pools; i++) {
1123 rx_pool = &adapter->rx_pool[i];
1124 dev_dbg(dev, "Updating LTB for rx pool %d [%d, %d]\n",
1125 i, rx_pool->size, rx_pool->buff_size);
1126
1127 rc = alloc_ltb_set(adapter, &rx_pool->ltb_set,
1128 rx_pool->size, rx_pool->buff_size);
1129 if (rc)
1130 goto out;
1131
1132 for (j = 0; j < rx_pool->size; ++j) {
1133 struct ibmvnic_rx_buff *rx_buff;
1134
1135 rx_pool->free_map[j] = j;
1136
1137 /* NOTE: Don't clear rx_buff->skb here - will leak
1138 * memory! replenish_rx_pool() will reuse skbs or
1139 * allocate as necessary.
1140 */
1141 rx_buff = &rx_pool->rx_buff[j];
1142 rx_buff->dma = 0;
1143 rx_buff->data = 0;
1144 rx_buff->size = 0;
1145 rx_buff->pool_index = 0;
1146 }
1147
1148 /* Mark pool "empty" so replenish_rx_pools() will
1149 * update the LTB info for each buffer
1150 */
1151 atomic_set(&rx_pool->available, 0);
1152 rx_pool->next_alloc = 0;
1153 rx_pool->next_free = 0;
1154 /* replenish_rx_pool() may have called deactivate_rx_pools()
1155 * on failover. Ensure pool is active now.
1156 */
1157 rx_pool->active = 1;
1158 }
1159 return 0;
1160out_release:
1161 release_rx_pools(adapter);
1162out:
1163 /* We failed to allocate one or more LTBs or map them on the VIOS.
1164 * Hold onto the pools and any LTBs that we did allocate/map.
1165 */
1166 return rc;
1167}
1168
1169static void release_vpd_data(struct ibmvnic_adapter *adapter)
1170{
1171 if (!adapter->vpd)
1172 return;
1173
1174 kfree(adapter->vpd->buff);
1175 kfree(adapter->vpd);
1176
1177 adapter->vpd = NULL;
1178}
1179
1180static void release_one_tx_pool(struct ibmvnic_adapter *adapter,
1181 struct ibmvnic_tx_pool *tx_pool)
1182{
1183 kfree(tx_pool->tx_buff);
1184 kfree(tx_pool->free_map);
1185 free_ltb_set(adapter, &tx_pool->ltb_set);
1186}
1187
1188/**
1189 * release_tx_pools() - Release any tx pools attached to @adapter.
1190 * @adapter: ibmvnic adapter
1191 *
1192 * Safe to call this multiple times - even if no pools are attached.
1193 */
1194static void release_tx_pools(struct ibmvnic_adapter *adapter)
1195{
1196 int i;
1197
1198 /* init_tx_pools() ensures that ->tx_pool and ->tso_pool are
1199 * both NULL or both non-NULL. So we only need to check one.
1200 */
1201 if (!adapter->tx_pool)
1202 return;
1203
1204 for (i = 0; i < adapter->num_active_tx_pools; i++) {
1205 release_one_tx_pool(adapter, &adapter->tx_pool[i]);
1206 release_one_tx_pool(adapter, &adapter->tso_pool[i]);
1207 }
1208
1209 kfree(adapter->tx_pool);
1210 adapter->tx_pool = NULL;
1211 kfree(adapter->tso_pool);
1212 adapter->tso_pool = NULL;
1213 adapter->num_active_tx_pools = 0;
1214 adapter->prev_tx_pool_size = 0;
1215}
1216
1217static int init_one_tx_pool(struct net_device *netdev,
1218 struct ibmvnic_tx_pool *tx_pool,
1219 int pool_size, int buf_size)
1220{
1221 int i;
1222
1223 tx_pool->tx_buff = kcalloc(pool_size,
1224 sizeof(struct ibmvnic_tx_buff),
1225 GFP_KERNEL);
1226 if (!tx_pool->tx_buff)
1227 return -ENOMEM;
1228
1229 tx_pool->free_map = kcalloc(pool_size, sizeof(int), GFP_KERNEL);
1230 if (!tx_pool->free_map) {
1231 kfree(tx_pool->tx_buff);
1232 tx_pool->tx_buff = NULL;
1233 return -ENOMEM;
1234 }
1235
1236 for (i = 0; i < pool_size; i++)
1237 tx_pool->free_map[i] = i;
1238
1239 tx_pool->consumer_index = 0;
1240 tx_pool->producer_index = 0;
1241 tx_pool->num_buffers = pool_size;
1242 tx_pool->buf_size = buf_size;
1243
1244 return 0;
1245}
1246
1247/**
1248 * reuse_tx_pools() - Check if the existing tx pools can be reused.
1249 * @adapter: ibmvnic adapter
1250 *
1251 * Check if the existing tx pools in the adapter can be reused. The
1252 * pools can be reused if the pool parameters (number of pools,
1253 * number of buffers in the pool and mtu) have not changed.
1254 *
1255 * NOTE: This assumes that all pools have the same number of buffers
1256 * which is the case currently. If that changes, we must fix this.
1257 *
1258 * Return: true if the tx pools can be reused, false otherwise.
1259 */
1260static bool reuse_tx_pools(struct ibmvnic_adapter *adapter)
1261{
1262 u64 old_num_pools, new_num_pools;
1263 u64 old_pool_size, new_pool_size;
1264 u64 old_mtu, new_mtu;
1265
1266 if (!adapter->tx_pool)
1267 return false;
1268
1269 old_num_pools = adapter->num_active_tx_pools;
1270 new_num_pools = adapter->num_active_tx_scrqs;
1271 old_pool_size = adapter->prev_tx_pool_size;
1272 new_pool_size = adapter->req_tx_entries_per_subcrq;
1273 old_mtu = adapter->prev_mtu;
1274 new_mtu = adapter->req_mtu;
1275
1276 if (old_mtu != new_mtu ||
1277 old_num_pools != new_num_pools ||
1278 old_pool_size != new_pool_size)
1279 return false;
1280
1281 return true;
1282}
1283
1284/**
1285 * init_tx_pools(): Initialize the set of transmit pools in the adapter.
1286 * @netdev: net device associated with the vnic interface
1287 *
1288 * Initialize the set of transmit pools in the ibmvnic adapter associated
1289 * with the net_device @netdev. If possible, reuse the existing tx pools.
1290 * Otherwise free any existing pools and allocate a new set of pools
1291 * before initializing them.
1292 *
1293 * Return: 0 on success and negative value on error.
1294 */
1295static int init_tx_pools(struct net_device *netdev)
1296{
1297 struct ibmvnic_adapter *adapter = netdev_priv(netdev);
1298 struct device *dev = &adapter->vdev->dev;
1299 int num_pools;
1300 u64 pool_size; /* # of buffers in pool */
1301 u64 buff_size;
1302 int i, j, rc;
1303
1304 num_pools = adapter->req_tx_queues;
1305
1306 /* We must notify the VIOS about the LTB on all resets - but we only
1307 * need to alloc/populate pools if either the number of buffers or
1308 * size of each buffer in the pool has changed.
1309 */
1310 if (reuse_tx_pools(adapter)) {
1311 netdev_dbg(netdev, "Reusing tx pools\n");
1312 goto update_ltb;
1313 }
1314
1315 /* Allocate/populate the pools. */
1316 release_tx_pools(adapter);
1317
1318 pool_size = adapter->req_tx_entries_per_subcrq;
1319 num_pools = adapter->num_active_tx_scrqs;
1320
1321 adapter->tx_pool = kcalloc(num_pools,
1322 sizeof(struct ibmvnic_tx_pool), GFP_KERNEL);
1323 if (!adapter->tx_pool)
1324 return -ENOMEM;
1325
1326 adapter->tso_pool = kcalloc(num_pools,
1327 sizeof(struct ibmvnic_tx_pool), GFP_KERNEL);
1328 /* To simplify release_tx_pools() ensure that ->tx_pool and
1329 * ->tso_pool are either both NULL or both non-NULL.
1330 */
1331 if (!adapter->tso_pool) {
1332 kfree(adapter->tx_pool);
1333 adapter->tx_pool = NULL;
1334 return -ENOMEM;
1335 }
1336
1337 /* Set num_active_tx_pools early. If we fail below after partial
1338 * allocation, release_tx_pools() will know how many to look for.
1339 */
1340 adapter->num_active_tx_pools = num_pools;
1341
1342 buff_size = adapter->req_mtu + VLAN_HLEN;
1343 buff_size = ALIGN(buff_size, L1_CACHE_BYTES);
1344
1345 for (i = 0; i < num_pools; i++) {
1346 dev_dbg(dev, "Init tx pool %d [%llu, %llu]\n",
1347 i, adapter->req_tx_entries_per_subcrq, buff_size);
1348
1349 rc = init_one_tx_pool(netdev, &adapter->tx_pool[i],
1350 pool_size, buff_size);
1351 if (rc)
1352 goto out_release;
1353
1354 rc = init_one_tx_pool(netdev, &adapter->tso_pool[i],
1355 IBMVNIC_TSO_BUFS,
1356 IBMVNIC_TSO_BUF_SZ);
1357 if (rc)
1358 goto out_release;
1359 }
1360
1361 adapter->prev_tx_pool_size = pool_size;
1362 adapter->prev_mtu = adapter->req_mtu;
1363
1364update_ltb:
1365 /* NOTE: All tx_pools have the same number of buffers (which is
1366 * same as pool_size). All tso_pools have IBMVNIC_TSO_BUFS
1367 * buffers (see calls init_one_tx_pool() for these).
1368 * For consistency, we use tx_pool->num_buffers and
1369 * tso_pool->num_buffers below.
1370 */
1371 rc = -1;
1372 for (i = 0; i < num_pools; i++) {
1373 struct ibmvnic_tx_pool *tso_pool;
1374 struct ibmvnic_tx_pool *tx_pool;
1375
1376 tx_pool = &adapter->tx_pool[i];
1377
1378 dev_dbg(dev, "Updating LTB for tx pool %d [%d, %d]\n",
1379 i, tx_pool->num_buffers, tx_pool->buf_size);
1380
1381 rc = alloc_ltb_set(adapter, &tx_pool->ltb_set,
1382 tx_pool->num_buffers, tx_pool->buf_size);
1383 if (rc)
1384 goto out;
1385
1386 tx_pool->consumer_index = 0;
1387 tx_pool->producer_index = 0;
1388
1389 for (j = 0; j < tx_pool->num_buffers; j++)
1390 tx_pool->free_map[j] = j;
1391
1392 tso_pool = &adapter->tso_pool[i];
1393
1394 dev_dbg(dev, "Updating LTB for tso pool %d [%d, %d]\n",
1395 i, tso_pool->num_buffers, tso_pool->buf_size);
1396
1397 rc = alloc_ltb_set(adapter, &tso_pool->ltb_set,
1398 tso_pool->num_buffers, tso_pool->buf_size);
1399 if (rc)
1400 goto out;
1401
1402 tso_pool->consumer_index = 0;
1403 tso_pool->producer_index = 0;
1404
1405 for (j = 0; j < tso_pool->num_buffers; j++)
1406 tso_pool->free_map[j] = j;
1407 }
1408
1409 return 0;
1410out_release:
1411 release_tx_pools(adapter);
1412out:
1413 /* We failed to allocate one or more LTBs or map them on the VIOS.
1414 * Hold onto the pools and any LTBs that we did allocate/map.
1415 */
1416 return rc;
1417}
1418
1419static void ibmvnic_napi_enable(struct ibmvnic_adapter *adapter)
1420{
1421 int i;
1422
1423 if (adapter->napi_enabled)
1424 return;
1425
1426 for (i = 0; i < adapter->req_rx_queues; i++)
1427 napi_enable(&adapter->napi[i]);
1428
1429 adapter->napi_enabled = true;
1430}
1431
1432static void ibmvnic_napi_disable(struct ibmvnic_adapter *adapter)
1433{
1434 int i;
1435
1436 if (!adapter->napi_enabled)
1437 return;
1438
1439 for (i = 0; i < adapter->req_rx_queues; i++) {
1440 netdev_dbg(adapter->netdev, "Disabling napi[%d]\n", i);
1441 napi_disable(&adapter->napi[i]);
1442 }
1443
1444 adapter->napi_enabled = false;
1445}
1446
1447static int init_napi(struct ibmvnic_adapter *adapter)
1448{
1449 int i;
1450
1451 adapter->napi = kcalloc(adapter->req_rx_queues,
1452 sizeof(struct napi_struct), GFP_KERNEL);
1453 if (!adapter->napi)
1454 return -ENOMEM;
1455
1456 for (i = 0; i < adapter->req_rx_queues; i++) {
1457 netdev_dbg(adapter->netdev, "Adding napi[%d]\n", i);
1458 netif_napi_add(adapter->netdev, &adapter->napi[i],
1459 ibmvnic_poll);
1460 }
1461
1462 adapter->num_active_rx_napi = adapter->req_rx_queues;
1463 return 0;
1464}
1465
1466static void release_napi(struct ibmvnic_adapter *adapter)
1467{
1468 int i;
1469
1470 if (!adapter->napi)
1471 return;
1472
1473 for (i = 0; i < adapter->num_active_rx_napi; i++) {
1474 netdev_dbg(adapter->netdev, "Releasing napi[%d]\n", i);
1475 netif_napi_del(&adapter->napi[i]);
1476 }
1477
1478 kfree(adapter->napi);
1479 adapter->napi = NULL;
1480 adapter->num_active_rx_napi = 0;
1481 adapter->napi_enabled = false;
1482}
1483
1484static const char *adapter_state_to_string(enum vnic_state state)
1485{
1486 switch (state) {
1487 case VNIC_PROBING:
1488 return "PROBING";
1489 case VNIC_PROBED:
1490 return "PROBED";
1491 case VNIC_OPENING:
1492 return "OPENING";
1493 case VNIC_OPEN:
1494 return "OPEN";
1495 case VNIC_CLOSING:
1496 return "CLOSING";
1497 case VNIC_CLOSED:
1498 return "CLOSED";
1499 case VNIC_REMOVING:
1500 return "REMOVING";
1501 case VNIC_REMOVED:
1502 return "REMOVED";
1503 case VNIC_DOWN:
1504 return "DOWN";
1505 }
1506 return "UNKNOWN";
1507}
1508
1509static int ibmvnic_login(struct net_device *netdev)
1510{
1511 unsigned long flags, timeout = msecs_to_jiffies(20000);
1512 struct ibmvnic_adapter *adapter = netdev_priv(netdev);
1513 int retry_count = 0;
1514 int retries = 10;
1515 bool retry;
1516 int rc;
1517
1518 do {
1519 retry = false;
1520 if (retry_count > retries) {
1521 netdev_warn(netdev, "Login attempts exceeded\n");
1522 return -EACCES;
1523 }
1524
1525 adapter->init_done_rc = 0;
1526 reinit_completion(&adapter->init_done);
1527 rc = send_login(adapter);
1528 if (rc)
1529 return rc;
1530
1531 if (!wait_for_completion_timeout(&adapter->init_done,
1532 timeout)) {
1533 netdev_warn(netdev, "Login timed out\n");
1534 adapter->login_pending = false;
1535 goto partial_reset;
1536 }
1537
1538 if (adapter->init_done_rc == ABORTED) {
1539 netdev_warn(netdev, "Login aborted, retrying...\n");
1540 retry = true;
1541 adapter->init_done_rc = 0;
1542 retry_count++;
1543 /* FW or device may be busy, so
1544 * wait a bit before retrying login
1545 */
1546 msleep(500);
1547 } else if (adapter->init_done_rc == PARTIALSUCCESS) {
1548 retry_count++;
1549 release_sub_crqs(adapter, 1);
1550
1551 retry = true;
1552 netdev_dbg(netdev,
1553 "Received partial success, retrying...\n");
1554 adapter->init_done_rc = 0;
1555 reinit_completion(&adapter->init_done);
1556 send_query_cap(adapter);
1557 if (!wait_for_completion_timeout(&adapter->init_done,
1558 timeout)) {
1559 netdev_warn(netdev,
1560 "Capabilities query timed out\n");
1561 return -ETIMEDOUT;
1562 }
1563
1564 rc = init_sub_crqs(adapter);
1565 if (rc) {
1566 netdev_warn(netdev,
1567 "SCRQ initialization failed\n");
1568 return rc;
1569 }
1570
1571 rc = init_sub_crq_irqs(adapter);
1572 if (rc) {
1573 netdev_warn(netdev,
1574 "SCRQ irq initialization failed\n");
1575 return rc;
1576 }
1577 /* Default/timeout error handling, reset and start fresh */
1578 } else if (adapter->init_done_rc) {
1579 netdev_warn(netdev, "Adapter login failed, init_done_rc = %d\n",
1580 adapter->init_done_rc);
1581
1582partial_reset:
1583 /* adapter login failed, so free any CRQs or sub-CRQs
1584 * and register again before attempting to login again.
1585 * If we don't do this then the VIOS may think that
1586 * we are already logged in and reject any subsequent
1587 * attempts
1588 */
1589 netdev_warn(netdev,
1590 "Freeing and re-registering CRQs before attempting to login again\n");
1591 retry = true;
1592 adapter->init_done_rc = 0;
1593 release_sub_crqs(adapter, true);
1594 /* Much of this is similar logic as ibmvnic_probe(),
1595 * we are essentially re-initializing communication
1596 * with the server. We really should not run any
1597 * resets/failovers here because this is already a form
1598 * of reset and we do not want parallel resets occurring
1599 */
1600 do {
1601 reinit_init_done(adapter);
1602 /* Clear any failovers we got in the previous
1603 * pass since we are re-initializing the CRQ
1604 */
1605 adapter->failover_pending = false;
1606 release_crq_queue(adapter);
1607 /* If we don't sleep here then we risk an
1608 * unnecessary failover event from the VIOS.
1609 * This is a known VIOS issue caused by a vnic
1610 * device freeing and registering a CRQ too
1611 * quickly.
1612 */
1613 msleep(1500);
1614 /* Avoid any resets, since we are currently
1615 * resetting.
1616 */
1617 spin_lock_irqsave(&adapter->rwi_lock, flags);
1618 flush_reset_queue(adapter);
1619 spin_unlock_irqrestore(&adapter->rwi_lock,
1620 flags);
1621
1622 rc = init_crq_queue(adapter);
1623 if (rc) {
1624 netdev_err(netdev, "login recovery: init CRQ failed %d\n",
1625 rc);
1626 return -EIO;
1627 }
1628
1629 rc = ibmvnic_reset_init(adapter, false);
1630 if (rc)
1631 netdev_err(netdev, "login recovery: Reset init failed %d\n",
1632 rc);
1633 /* IBMVNIC_CRQ_INIT will return EAGAIN if it
1634 * fails, since ibmvnic_reset_init will free
1635 * irq's in failure, we won't be able to receive
1636 * new CRQs so we need to keep trying. probe()
1637 * handles this similarly.
1638 */
1639 } while (rc == -EAGAIN && retry_count++ < retries);
1640 }
1641 } while (retry);
1642
1643 __ibmvnic_set_mac(netdev, adapter->mac_addr);
1644
1645 netdev_dbg(netdev, "[S:%s] Login succeeded\n", adapter_state_to_string(adapter->state));
1646 return 0;
1647}
1648
1649static void release_login_buffer(struct ibmvnic_adapter *adapter)
1650{
1651 if (!adapter->login_buf)
1652 return;
1653
1654 dma_unmap_single(&adapter->vdev->dev, adapter->login_buf_token,
1655 adapter->login_buf_sz, DMA_TO_DEVICE);
1656 kfree(adapter->login_buf);
1657 adapter->login_buf = NULL;
1658}
1659
1660static void release_login_rsp_buffer(struct ibmvnic_adapter *adapter)
1661{
1662 if (!adapter->login_rsp_buf)
1663 return;
1664
1665 dma_unmap_single(&adapter->vdev->dev, adapter->login_rsp_buf_token,
1666 adapter->login_rsp_buf_sz, DMA_FROM_DEVICE);
1667 kfree(adapter->login_rsp_buf);
1668 adapter->login_rsp_buf = NULL;
1669}
1670
1671static void release_resources(struct ibmvnic_adapter *adapter)
1672{
1673 release_vpd_data(adapter);
1674
1675 release_napi(adapter);
1676 release_login_buffer(adapter);
1677 release_login_rsp_buffer(adapter);
1678}
1679
1680static int set_link_state(struct ibmvnic_adapter *adapter, u8 link_state)
1681{
1682 struct net_device *netdev = adapter->netdev;
1683 unsigned long timeout = msecs_to_jiffies(20000);
1684 union ibmvnic_crq crq;
1685 bool resend;
1686 int rc;
1687
1688 netdev_dbg(netdev, "setting link state %d\n", link_state);
1689
1690 memset(&crq, 0, sizeof(crq));
1691 crq.logical_link_state.first = IBMVNIC_CRQ_CMD;
1692 crq.logical_link_state.cmd = LOGICAL_LINK_STATE;
1693 crq.logical_link_state.link_state = link_state;
1694
1695 do {
1696 resend = false;
1697
1698 reinit_completion(&adapter->init_done);
1699 rc = ibmvnic_send_crq(adapter, &crq);
1700 if (rc) {
1701 netdev_err(netdev, "Failed to set link state\n");
1702 return rc;
1703 }
1704
1705 if (!wait_for_completion_timeout(&adapter->init_done,
1706 timeout)) {
1707 netdev_err(netdev, "timeout setting link state\n");
1708 return -ETIMEDOUT;
1709 }
1710
1711 if (adapter->init_done_rc == PARTIALSUCCESS) {
1712 /* Partuial success, delay and re-send */
1713 mdelay(1000);
1714 resend = true;
1715 } else if (adapter->init_done_rc) {
1716 netdev_warn(netdev, "Unable to set link state, rc=%d\n",
1717 adapter->init_done_rc);
1718 return adapter->init_done_rc;
1719 }
1720 } while (resend);
1721
1722 return 0;
1723}
1724
1725static int set_real_num_queues(struct net_device *netdev)
1726{
1727 struct ibmvnic_adapter *adapter = netdev_priv(netdev);
1728 int rc;
1729
1730 netdev_dbg(netdev, "Setting real tx/rx queues (%llx/%llx)\n",
1731 adapter->req_tx_queues, adapter->req_rx_queues);
1732
1733 rc = netif_set_real_num_tx_queues(netdev, adapter->req_tx_queues);
1734 if (rc) {
1735 netdev_err(netdev, "failed to set the number of tx queues\n");
1736 return rc;
1737 }
1738
1739 rc = netif_set_real_num_rx_queues(netdev, adapter->req_rx_queues);
1740 if (rc)
1741 netdev_err(netdev, "failed to set the number of rx queues\n");
1742
1743 return rc;
1744}
1745
1746static int ibmvnic_get_vpd(struct ibmvnic_adapter *adapter)
1747{
1748 struct device *dev = &adapter->vdev->dev;
1749 union ibmvnic_crq crq;
1750 int len = 0;
1751 int rc;
1752
1753 if (adapter->vpd->buff)
1754 len = adapter->vpd->len;
1755
1756 mutex_lock(&adapter->fw_lock);
1757 adapter->fw_done_rc = 0;
1758 reinit_completion(&adapter->fw_done);
1759
1760 crq.get_vpd_size.first = IBMVNIC_CRQ_CMD;
1761 crq.get_vpd_size.cmd = GET_VPD_SIZE;
1762 rc = ibmvnic_send_crq(adapter, &crq);
1763 if (rc) {
1764 mutex_unlock(&adapter->fw_lock);
1765 return rc;
1766 }
1767
1768 rc = ibmvnic_wait_for_completion(adapter, &adapter->fw_done, 10000);
1769 if (rc) {
1770 dev_err(dev, "Could not retrieve VPD size, rc = %d\n", rc);
1771 mutex_unlock(&adapter->fw_lock);
1772 return rc;
1773 }
1774 mutex_unlock(&adapter->fw_lock);
1775
1776 if (!adapter->vpd->len)
1777 return -ENODATA;
1778
1779 if (!adapter->vpd->buff)
1780 adapter->vpd->buff = kzalloc(adapter->vpd->len, GFP_KERNEL);
1781 else if (adapter->vpd->len != len)
1782 adapter->vpd->buff =
1783 krealloc(adapter->vpd->buff,
1784 adapter->vpd->len, GFP_KERNEL);
1785
1786 if (!adapter->vpd->buff) {
1787 dev_err(dev, "Could allocate VPD buffer\n");
1788 return -ENOMEM;
1789 }
1790
1791 adapter->vpd->dma_addr =
1792 dma_map_single(dev, adapter->vpd->buff, adapter->vpd->len,
1793 DMA_FROM_DEVICE);
1794 if (dma_mapping_error(dev, adapter->vpd->dma_addr)) {
1795 dev_err(dev, "Could not map VPD buffer\n");
1796 kfree(adapter->vpd->buff);
1797 adapter->vpd->buff = NULL;
1798 return -ENOMEM;
1799 }
1800
1801 mutex_lock(&adapter->fw_lock);
1802 adapter->fw_done_rc = 0;
1803 reinit_completion(&adapter->fw_done);
1804
1805 crq.get_vpd.first = IBMVNIC_CRQ_CMD;
1806 crq.get_vpd.cmd = GET_VPD;
1807 crq.get_vpd.ioba = cpu_to_be32(adapter->vpd->dma_addr);
1808 crq.get_vpd.len = cpu_to_be32((u32)adapter->vpd->len);
1809 rc = ibmvnic_send_crq(adapter, &crq);
1810 if (rc) {
1811 kfree(adapter->vpd->buff);
1812 adapter->vpd->buff = NULL;
1813 mutex_unlock(&adapter->fw_lock);
1814 return rc;
1815 }
1816
1817 rc = ibmvnic_wait_for_completion(adapter, &adapter->fw_done, 10000);
1818 if (rc) {
1819 dev_err(dev, "Unable to retrieve VPD, rc = %d\n", rc);
1820 kfree(adapter->vpd->buff);
1821 adapter->vpd->buff = NULL;
1822 mutex_unlock(&adapter->fw_lock);
1823 return rc;
1824 }
1825
1826 mutex_unlock(&adapter->fw_lock);
1827 return 0;
1828}
1829
1830static int init_resources(struct ibmvnic_adapter *adapter)
1831{
1832 struct net_device *netdev = adapter->netdev;
1833 int rc;
1834
1835 rc = set_real_num_queues(netdev);
1836 if (rc)
1837 return rc;
1838
1839 adapter->vpd = kzalloc(sizeof(*adapter->vpd), GFP_KERNEL);
1840 if (!adapter->vpd)
1841 return -ENOMEM;
1842
1843 /* Vital Product Data (VPD) */
1844 rc = ibmvnic_get_vpd(adapter);
1845 if (rc) {
1846 netdev_err(netdev, "failed to initialize Vital Product Data (VPD)\n");
1847 return rc;
1848 }
1849
1850 rc = init_napi(adapter);
1851 if (rc)
1852 return rc;
1853
1854 send_query_map(adapter);
1855
1856 rc = init_rx_pools(netdev);
1857 if (rc)
1858 return rc;
1859
1860 rc = init_tx_pools(netdev);
1861 return rc;
1862}
1863
1864static int __ibmvnic_open(struct net_device *netdev)
1865{
1866 struct ibmvnic_adapter *adapter = netdev_priv(netdev);
1867 enum vnic_state prev_state = adapter->state;
1868 int i, rc;
1869
1870 adapter->state = VNIC_OPENING;
1871 replenish_pools(adapter);
1872 ibmvnic_napi_enable(adapter);
1873
1874 /* We're ready to receive frames, enable the sub-crq interrupts and
1875 * set the logical link state to up
1876 */
1877 for (i = 0; i < adapter->req_rx_queues; i++) {
1878 netdev_dbg(netdev, "Enabling rx_scrq[%d] irq\n", i);
1879 if (prev_state == VNIC_CLOSED)
1880 enable_irq(adapter->rx_scrq[i]->irq);
1881 enable_scrq_irq(adapter, adapter->rx_scrq[i]);
1882 }
1883
1884 for (i = 0; i < adapter->req_tx_queues; i++) {
1885 netdev_dbg(netdev, "Enabling tx_scrq[%d] irq\n", i);
1886 if (prev_state == VNIC_CLOSED)
1887 enable_irq(adapter->tx_scrq[i]->irq);
1888 enable_scrq_irq(adapter, adapter->tx_scrq[i]);
1889 /* netdev_tx_reset_queue will reset dql stats. During NON_FATAL
1890 * resets, don't reset the stats because there could be batched
1891 * skb's waiting to be sent. If we reset dql stats, we risk
1892 * num_completed being greater than num_queued. This will cause
1893 * a BUG_ON in dql_completed().
1894 */
1895 if (adapter->reset_reason != VNIC_RESET_NON_FATAL)
1896 netdev_tx_reset_queue(netdev_get_tx_queue(netdev, i));
1897 }
1898
1899 rc = set_link_state(adapter, IBMVNIC_LOGICAL_LNK_UP);
1900 if (rc) {
1901 ibmvnic_napi_disable(adapter);
1902 ibmvnic_disable_irqs(adapter);
1903 return rc;
1904 }
1905
1906 adapter->tx_queues_active = true;
1907
1908 /* Since queues were stopped until now, there shouldn't be any
1909 * one in ibmvnic_complete_tx() or ibmvnic_xmit() so maybe we
1910 * don't need the synchronize_rcu()? Leaving it for consistency
1911 * with setting ->tx_queues_active = false.
1912 */
1913 synchronize_rcu();
1914
1915 netif_tx_start_all_queues(netdev);
1916
1917 if (prev_state == VNIC_CLOSED) {
1918 for (i = 0; i < adapter->req_rx_queues; i++)
1919 napi_schedule(&adapter->napi[i]);
1920 }
1921
1922 adapter->state = VNIC_OPEN;
1923 return rc;
1924}
1925
1926static int ibmvnic_open(struct net_device *netdev)
1927{
1928 struct ibmvnic_adapter *adapter = netdev_priv(netdev);
1929 int rc;
1930
1931 ASSERT_RTNL();
1932
1933 /* If device failover is pending or we are about to reset, just set
1934 * device state and return. Device operation will be handled by reset
1935 * routine.
1936 *
1937 * It should be safe to overwrite the adapter->state here. Since
1938 * we hold the rtnl, either the reset has not actually started or
1939 * the rtnl got dropped during the set_link_state() in do_reset().
1940 * In the former case, no one else is changing the state (again we
1941 * have the rtnl) and in the latter case, do_reset() will detect and
1942 * honor our setting below.
1943 */
1944 if (adapter->failover_pending || (test_bit(0, &adapter->resetting))) {
1945 netdev_dbg(netdev, "[S:%s FOP:%d] Resetting, deferring open\n",
1946 adapter_state_to_string(adapter->state),
1947 adapter->failover_pending);
1948 adapter->state = VNIC_OPEN;
1949 rc = 0;
1950 goto out;
1951 }
1952
1953 if (adapter->state != VNIC_CLOSED) {
1954 rc = ibmvnic_login(netdev);
1955 if (rc)
1956 goto out;
1957
1958 rc = init_resources(adapter);
1959 if (rc) {
1960 netdev_err(netdev, "failed to initialize resources\n");
1961 goto out;
1962 }
1963 }
1964
1965 rc = __ibmvnic_open(netdev);
1966
1967out:
1968 /* If open failed and there is a pending failover or in-progress reset,
1969 * set device state and return. Device operation will be handled by
1970 * reset routine. See also comments above regarding rtnl.
1971 */
1972 if (rc &&
1973 (adapter->failover_pending || (test_bit(0, &adapter->resetting)))) {
1974 adapter->state = VNIC_OPEN;
1975 rc = 0;
1976 }
1977
1978 if (rc) {
1979 release_resources(adapter);
1980 release_rx_pools(adapter);
1981 release_tx_pools(adapter);
1982 }
1983
1984 return rc;
1985}
1986
1987static void clean_rx_pools(struct ibmvnic_adapter *adapter)
1988{
1989 struct ibmvnic_rx_pool *rx_pool;
1990 struct ibmvnic_rx_buff *rx_buff;
1991 u64 rx_entries;
1992 int rx_scrqs;
1993 int i, j;
1994
1995 if (!adapter->rx_pool)
1996 return;
1997
1998 rx_scrqs = adapter->num_active_rx_pools;
1999 rx_entries = adapter->req_rx_add_entries_per_subcrq;
2000
2001 /* Free any remaining skbs in the rx buffer pools */
2002 for (i = 0; i < rx_scrqs; i++) {
2003 rx_pool = &adapter->rx_pool[i];
2004 if (!rx_pool || !rx_pool->rx_buff)
2005 continue;
2006
2007 netdev_dbg(adapter->netdev, "Cleaning rx_pool[%d]\n", i);
2008 for (j = 0; j < rx_entries; j++) {
2009 rx_buff = &rx_pool->rx_buff[j];
2010 if (rx_buff && rx_buff->skb) {
2011 dev_kfree_skb_any(rx_buff->skb);
2012 rx_buff->skb = NULL;
2013 }
2014 }
2015 }
2016}
2017
2018static void clean_one_tx_pool(struct ibmvnic_adapter *adapter,
2019 struct ibmvnic_tx_pool *tx_pool)
2020{
2021 struct ibmvnic_tx_buff *tx_buff;
2022 u64 tx_entries;
2023 int i;
2024
2025 if (!tx_pool || !tx_pool->tx_buff)
2026 return;
2027
2028 tx_entries = tx_pool->num_buffers;
2029
2030 for (i = 0; i < tx_entries; i++) {
2031 tx_buff = &tx_pool->tx_buff[i];
2032 if (tx_buff && tx_buff->skb) {
2033 dev_kfree_skb_any(tx_buff->skb);
2034 tx_buff->skb = NULL;
2035 }
2036 }
2037}
2038
2039static void clean_tx_pools(struct ibmvnic_adapter *adapter)
2040{
2041 int tx_scrqs;
2042 int i;
2043
2044 if (!adapter->tx_pool || !adapter->tso_pool)
2045 return;
2046
2047 tx_scrqs = adapter->num_active_tx_pools;
2048
2049 /* Free any remaining skbs in the tx buffer pools */
2050 for (i = 0; i < tx_scrqs; i++) {
2051 netdev_dbg(adapter->netdev, "Cleaning tx_pool[%d]\n", i);
2052 clean_one_tx_pool(adapter, &adapter->tx_pool[i]);
2053 clean_one_tx_pool(adapter, &adapter->tso_pool[i]);
2054 }
2055}
2056
2057static void ibmvnic_disable_irqs(struct ibmvnic_adapter *adapter)
2058{
2059 struct net_device *netdev = adapter->netdev;
2060 int i;
2061
2062 if (adapter->tx_scrq) {
2063 for (i = 0; i < adapter->req_tx_queues; i++)
2064 if (adapter->tx_scrq[i]->irq) {
2065 netdev_dbg(netdev,
2066 "Disabling tx_scrq[%d] irq\n", i);
2067 disable_scrq_irq(adapter, adapter->tx_scrq[i]);
2068 disable_irq(adapter->tx_scrq[i]->irq);
2069 }
2070 }
2071
2072 if (adapter->rx_scrq) {
2073 for (i = 0; i < adapter->req_rx_queues; i++) {
2074 if (adapter->rx_scrq[i]->irq) {
2075 netdev_dbg(netdev,
2076 "Disabling rx_scrq[%d] irq\n", i);
2077 disable_scrq_irq(adapter, adapter->rx_scrq[i]);
2078 disable_irq(adapter->rx_scrq[i]->irq);
2079 }
2080 }
2081 }
2082}
2083
2084static void ibmvnic_cleanup(struct net_device *netdev)
2085{
2086 struct ibmvnic_adapter *adapter = netdev_priv(netdev);
2087
2088 /* ensure that transmissions are stopped if called by do_reset */
2089
2090 adapter->tx_queues_active = false;
2091
2092 /* Ensure complete_tx() and ibmvnic_xmit() see ->tx_queues_active
2093 * update so they don't restart a queue after we stop it below.
2094 */
2095 synchronize_rcu();
2096
2097 if (test_bit(0, &adapter->resetting))
2098 netif_tx_disable(netdev);
2099 else
2100 netif_tx_stop_all_queues(netdev);
2101
2102 ibmvnic_napi_disable(adapter);
2103 ibmvnic_disable_irqs(adapter);
2104}
2105
2106static int __ibmvnic_close(struct net_device *netdev)
2107{
2108 struct ibmvnic_adapter *adapter = netdev_priv(netdev);
2109 int rc = 0;
2110
2111 adapter->state = VNIC_CLOSING;
2112 rc = set_link_state(adapter, IBMVNIC_LOGICAL_LNK_DN);
2113 adapter->state = VNIC_CLOSED;
2114 return rc;
2115}
2116
2117static int ibmvnic_close(struct net_device *netdev)
2118{
2119 struct ibmvnic_adapter *adapter = netdev_priv(netdev);
2120 int rc;
2121
2122 netdev_dbg(netdev, "[S:%s FOP:%d FRR:%d] Closing\n",
2123 adapter_state_to_string(adapter->state),
2124 adapter->failover_pending,
2125 adapter->force_reset_recovery);
2126
2127 /* If device failover is pending, just set device state and return.
2128 * Device operation will be handled by reset routine.
2129 */
2130 if (adapter->failover_pending) {
2131 adapter->state = VNIC_CLOSED;
2132 return 0;
2133 }
2134
2135 rc = __ibmvnic_close(netdev);
2136 ibmvnic_cleanup(netdev);
2137 clean_rx_pools(adapter);
2138 clean_tx_pools(adapter);
2139
2140 return rc;
2141}
2142
2143/**
2144 * get_hdr_lens - fills list of L2/L3/L4 hdr lens
2145 * @hdr_field: bitfield determining needed headers
2146 * @skb: socket buffer
2147 * @hdr_len: array of header lengths to be filled
2148 *
2149 * Reads hdr_field to determine which headers are needed by firmware.
2150 * Builds a buffer containing these headers. Saves individual header
2151 * lengths and total buffer length to be used to build descriptors.
2152 *
2153 * Return: total len of all headers
2154 */
2155static int get_hdr_lens(u8 hdr_field, struct sk_buff *skb,
2156 int *hdr_len)
2157{
2158 int len = 0;
2159
2160
2161 if ((hdr_field >> 6) & 1) {
2162 hdr_len[0] = skb_mac_header_len(skb);
2163 len += hdr_len[0];
2164 }
2165
2166 if ((hdr_field >> 5) & 1) {
2167 hdr_len[1] = skb_network_header_len(skb);
2168 len += hdr_len[1];
2169 }
2170
2171 if (!((hdr_field >> 4) & 1))
2172 return len;
2173
2174 if (skb->protocol == htons(ETH_P_IP)) {
2175 if (ip_hdr(skb)->protocol == IPPROTO_TCP)
2176 hdr_len[2] = tcp_hdrlen(skb);
2177 else if (ip_hdr(skb)->protocol == IPPROTO_UDP)
2178 hdr_len[2] = sizeof(struct udphdr);
2179 } else if (skb->protocol == htons(ETH_P_IPV6)) {
2180 if (ipv6_hdr(skb)->nexthdr == IPPROTO_TCP)
2181 hdr_len[2] = tcp_hdrlen(skb);
2182 else if (ipv6_hdr(skb)->nexthdr == IPPROTO_UDP)
2183 hdr_len[2] = sizeof(struct udphdr);
2184 }
2185
2186 return len + hdr_len[2];
2187}
2188
2189/**
2190 * create_hdr_descs - create header and header extension descriptors
2191 * @hdr_field: bitfield determining needed headers
2192 * @hdr_data: buffer containing header data
2193 * @len: length of data buffer
2194 * @hdr_len: array of individual header lengths
2195 * @scrq_arr: descriptor array
2196 *
2197 * Creates header and, if needed, header extension descriptors and
2198 * places them in a descriptor array, scrq_arr
2199 *
2200 * Return: Number of header descs
2201 */
2202
2203static int create_hdr_descs(u8 hdr_field, u8 *hdr_data, int len, int *hdr_len,
2204 union sub_crq *scrq_arr)
2205{
2206 union sub_crq *hdr_desc;
2207 int tmp_len = len;
2208 int num_descs = 0;
2209 u8 *data, *cur;
2210 int tmp;
2211
2212 while (tmp_len > 0) {
2213 cur = hdr_data + len - tmp_len;
2214
2215 hdr_desc = &scrq_arr[num_descs];
2216 if (num_descs) {
2217 data = hdr_desc->hdr_ext.data;
2218 tmp = tmp_len > 29 ? 29 : tmp_len;
2219 hdr_desc->hdr_ext.first = IBMVNIC_CRQ_CMD;
2220 hdr_desc->hdr_ext.type = IBMVNIC_HDR_EXT_DESC;
2221 hdr_desc->hdr_ext.len = tmp;
2222 } else {
2223 data = hdr_desc->hdr.data;
2224 tmp = tmp_len > 24 ? 24 : tmp_len;
2225 hdr_desc->hdr.first = IBMVNIC_CRQ_CMD;
2226 hdr_desc->hdr.type = IBMVNIC_HDR_DESC;
2227 hdr_desc->hdr.len = tmp;
2228 hdr_desc->hdr.l2_len = (u8)hdr_len[0];
2229 hdr_desc->hdr.l3_len = cpu_to_be16((u16)hdr_len[1]);
2230 hdr_desc->hdr.l4_len = (u8)hdr_len[2];
2231 hdr_desc->hdr.flag = hdr_field << 1;
2232 }
2233 memcpy(data, cur, tmp);
2234 tmp_len -= tmp;
2235 num_descs++;
2236 }
2237
2238 return num_descs;
2239}
2240
2241/**
2242 * build_hdr_descs_arr - build a header descriptor array
2243 * @skb: tx socket buffer
2244 * @indir_arr: indirect array
2245 * @num_entries: number of descriptors to be sent
2246 * @hdr_field: bit field determining which headers will be sent
2247 *
2248 * This function will build a TX descriptor array with applicable
2249 * L2/L3/L4 packet header descriptors to be sent by send_subcrq_indirect.
2250 */
2251
2252static void build_hdr_descs_arr(struct sk_buff *skb,
2253 union sub_crq *indir_arr,
2254 int *num_entries, u8 hdr_field)
2255{
2256 int hdr_len[3] = {0, 0, 0};
2257 int tot_len;
2258
2259 tot_len = get_hdr_lens(hdr_field, skb, hdr_len);
2260 *num_entries += create_hdr_descs(hdr_field, skb_mac_header(skb),
2261 tot_len, hdr_len, indir_arr + 1);
2262}
2263
2264static int ibmvnic_xmit_workarounds(struct sk_buff *skb,
2265 struct net_device *netdev)
2266{
2267 /* For some backing devices, mishandling of small packets
2268 * can result in a loss of connection or TX stall. Device
2269 * architects recommend that no packet should be smaller
2270 * than the minimum MTU value provided to the driver, so
2271 * pad any packets to that length
2272 */
2273 if (skb->len < netdev->min_mtu)
2274 return skb_put_padto(skb, netdev->min_mtu);
2275
2276 return 0;
2277}
2278
2279static void ibmvnic_tx_scrq_clean_buffer(struct ibmvnic_adapter *adapter,
2280 struct ibmvnic_sub_crq_queue *tx_scrq)
2281{
2282 struct ibmvnic_ind_xmit_queue *ind_bufp;
2283 struct ibmvnic_tx_buff *tx_buff;
2284 struct ibmvnic_tx_pool *tx_pool;
2285 union sub_crq tx_scrq_entry;
2286 int queue_num;
2287 int entries;
2288 int index;
2289 int i;
2290
2291 ind_bufp = &tx_scrq->ind_buf;
2292 entries = (u64)ind_bufp->index;
2293 queue_num = tx_scrq->pool_index;
2294
2295 for (i = entries - 1; i >= 0; --i) {
2296 tx_scrq_entry = ind_bufp->indir_arr[i];
2297 if (tx_scrq_entry.v1.type != IBMVNIC_TX_DESC)
2298 continue;
2299 index = be32_to_cpu(tx_scrq_entry.v1.correlator);
2300 if (index & IBMVNIC_TSO_POOL_MASK) {
2301 tx_pool = &adapter->tso_pool[queue_num];
2302 index &= ~IBMVNIC_TSO_POOL_MASK;
2303 } else {
2304 tx_pool = &adapter->tx_pool[queue_num];
2305 }
2306 tx_pool->free_map[tx_pool->consumer_index] = index;
2307 tx_pool->consumer_index = tx_pool->consumer_index == 0 ?
2308 tx_pool->num_buffers - 1 :
2309 tx_pool->consumer_index - 1;
2310 tx_buff = &tx_pool->tx_buff[index];
2311 adapter->netdev->stats.tx_packets--;
2312 adapter->netdev->stats.tx_bytes -= tx_buff->skb->len;
2313 adapter->tx_stats_buffers[queue_num].batched_packets--;
2314 adapter->tx_stats_buffers[queue_num].bytes -=
2315 tx_buff->skb->len;
2316 dev_kfree_skb_any(tx_buff->skb);
2317 tx_buff->skb = NULL;
2318 adapter->netdev->stats.tx_dropped++;
2319 }
2320
2321 ind_bufp->index = 0;
2322
2323 if (atomic_sub_return(entries, &tx_scrq->used) <=
2324 (adapter->req_tx_entries_per_subcrq / 2) &&
2325 __netif_subqueue_stopped(adapter->netdev, queue_num)) {
2326 rcu_read_lock();
2327
2328 if (adapter->tx_queues_active) {
2329 netif_wake_subqueue(adapter->netdev, queue_num);
2330 netdev_dbg(adapter->netdev, "Started queue %d\n",
2331 queue_num);
2332 }
2333
2334 rcu_read_unlock();
2335 }
2336}
2337
2338static int send_subcrq_direct(struct ibmvnic_adapter *adapter,
2339 u64 remote_handle, u64 *entry)
2340{
2341 unsigned int ua = adapter->vdev->unit_address;
2342 struct device *dev = &adapter->vdev->dev;
2343 int rc;
2344
2345 /* Make sure the hypervisor sees the complete request */
2346 dma_wmb();
2347 rc = plpar_hcall_norets(H_SEND_SUB_CRQ, ua,
2348 cpu_to_be64(remote_handle),
2349 cpu_to_be64(entry[0]), cpu_to_be64(entry[1]),
2350 cpu_to_be64(entry[2]), cpu_to_be64(entry[3]));
2351
2352 if (rc)
2353 print_subcrq_error(dev, rc, __func__);
2354
2355 return rc;
2356}
2357
2358static int ibmvnic_tx_scrq_flush(struct ibmvnic_adapter *adapter,
2359 struct ibmvnic_sub_crq_queue *tx_scrq,
2360 bool indirect)
2361{
2362 struct ibmvnic_ind_xmit_queue *ind_bufp;
2363 u64 dma_addr;
2364 u64 entries;
2365 u64 handle;
2366 int rc;
2367
2368 ind_bufp = &tx_scrq->ind_buf;
2369 dma_addr = (u64)ind_bufp->indir_dma;
2370 entries = (u64)ind_bufp->index;
2371 handle = tx_scrq->handle;
2372
2373 if (!entries)
2374 return 0;
2375
2376 if (indirect)
2377 rc = send_subcrq_indirect(adapter, handle, dma_addr, entries);
2378 else
2379 rc = send_subcrq_direct(adapter, handle,
2380 (u64 *)ind_bufp->indir_arr);
2381
2382 if (rc)
2383 ibmvnic_tx_scrq_clean_buffer(adapter, tx_scrq);
2384 else
2385 ind_bufp->index = 0;
2386 return rc;
2387}
2388
2389static netdev_tx_t ibmvnic_xmit(struct sk_buff *skb, struct net_device *netdev)
2390{
2391 struct ibmvnic_adapter *adapter = netdev_priv(netdev);
2392 int queue_num = skb_get_queue_mapping(skb);
2393 u8 *hdrs = (u8 *)&adapter->tx_rx_desc_req;
2394 struct device *dev = &adapter->vdev->dev;
2395 struct ibmvnic_ind_xmit_queue *ind_bufp;
2396 struct ibmvnic_tx_buff *tx_buff = NULL;
2397 struct ibmvnic_sub_crq_queue *tx_scrq;
2398 struct ibmvnic_long_term_buff *ltb;
2399 struct ibmvnic_tx_pool *tx_pool;
2400 unsigned int tx_send_failed = 0;
2401 netdev_tx_t ret = NETDEV_TX_OK;
2402 unsigned int tx_map_failed = 0;
2403 union sub_crq indir_arr[16];
2404 unsigned int tx_dropped = 0;
2405 unsigned int tx_dpackets = 0;
2406 unsigned int tx_bpackets = 0;
2407 unsigned int tx_bytes = 0;
2408 dma_addr_t data_dma_addr;
2409 struct netdev_queue *txq;
2410 unsigned long lpar_rc;
2411 unsigned int skblen;
2412 union sub_crq tx_crq;
2413 unsigned int offset;
2414 bool use_scrq_send_direct = false;
2415 int num_entries = 1;
2416 unsigned char *dst;
2417 int bufidx = 0;
2418 u8 proto = 0;
2419
2420 /* If a reset is in progress, drop the packet since
2421 * the scrqs may get torn down. Otherwise use the
2422 * rcu to ensure reset waits for us to complete.
2423 */
2424 rcu_read_lock();
2425 if (!adapter->tx_queues_active) {
2426 dev_kfree_skb_any(skb);
2427
2428 tx_send_failed++;
2429 tx_dropped++;
2430 ret = NETDEV_TX_OK;
2431 goto out;
2432 }
2433
2434 tx_scrq = adapter->tx_scrq[queue_num];
2435 txq = netdev_get_tx_queue(netdev, queue_num);
2436 ind_bufp = &tx_scrq->ind_buf;
2437
2438 if (ibmvnic_xmit_workarounds(skb, netdev)) {
2439 tx_dropped++;
2440 tx_send_failed++;
2441 ret = NETDEV_TX_OK;
2442 lpar_rc = ibmvnic_tx_scrq_flush(adapter, tx_scrq, true);
2443 if (lpar_rc != H_SUCCESS)
2444 goto tx_err;
2445 goto out;
2446 }
2447
2448 if (skb_is_gso(skb))
2449 tx_pool = &adapter->tso_pool[queue_num];
2450 else
2451 tx_pool = &adapter->tx_pool[queue_num];
2452
2453 bufidx = tx_pool->free_map[tx_pool->consumer_index];
2454
2455 if (bufidx == IBMVNIC_INVALID_MAP) {
2456 dev_kfree_skb_any(skb);
2457 tx_send_failed++;
2458 tx_dropped++;
2459 ret = NETDEV_TX_OK;
2460 lpar_rc = ibmvnic_tx_scrq_flush(adapter, tx_scrq, true);
2461 if (lpar_rc != H_SUCCESS)
2462 goto tx_err;
2463 goto out;
2464 }
2465
2466 tx_pool->free_map[tx_pool->consumer_index] = IBMVNIC_INVALID_MAP;
2467
2468 map_txpool_buf_to_ltb(tx_pool, bufidx, <b, &offset);
2469
2470 dst = ltb->buff + offset;
2471 memset(dst, 0, tx_pool->buf_size);
2472 data_dma_addr = ltb->addr + offset;
2473
2474 /* if we are going to send_subcrq_direct this then we need to
2475 * update the checksum before copying the data into ltb. Essentially
2476 * these packets force disable CSO so that we can guarantee that
2477 * FW does not need header info and we can send direct. Also, vnic
2478 * server must be able to xmit standard packets without header data
2479 */
2480 if (*hdrs == 0 && !skb_is_gso(skb) &&
2481 !ind_bufp->index && !netdev_xmit_more()) {
2482 use_scrq_send_direct = true;
2483 if (skb->ip_summed == CHECKSUM_PARTIAL &&
2484 skb_checksum_help(skb))
2485 use_scrq_send_direct = false;
2486 }
2487
2488 if (skb_shinfo(skb)->nr_frags) {
2489 int cur, i;
2490
2491 /* Copy the head */
2492 skb_copy_from_linear_data(skb, dst, skb_headlen(skb));
2493 cur = skb_headlen(skb);
2494
2495 /* Copy the frags */
2496 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
2497 const skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
2498
2499 memcpy(dst + cur, skb_frag_address(frag),
2500 skb_frag_size(frag));
2501 cur += skb_frag_size(frag);
2502 }
2503 } else {
2504 skb_copy_from_linear_data(skb, dst, skb->len);
2505 }
2506
2507 tx_pool->consumer_index =
2508 (tx_pool->consumer_index + 1) % tx_pool->num_buffers;
2509
2510 tx_buff = &tx_pool->tx_buff[bufidx];
2511
2512 /* Sanity checks on our free map to make sure it points to an index
2513 * that is not being occupied by another skb. If skb memory is
2514 * not freed then we see congestion control kick in and halt tx.
2515 */
2516 if (unlikely(tx_buff->skb)) {
2517 dev_warn_ratelimited(dev, "TX free map points to untracked skb (%s %d idx=%d)\n",
2518 skb_is_gso(skb) ? "tso_pool" : "tx_pool",
2519 queue_num, bufidx);
2520 dev_kfree_skb_any(tx_buff->skb);
2521 }
2522
2523 tx_buff->skb = skb;
2524 tx_buff->index = bufidx;
2525 tx_buff->pool_index = queue_num;
2526 skblen = skb->len;
2527
2528 memset(&tx_crq, 0, sizeof(tx_crq));
2529 tx_crq.v1.first = IBMVNIC_CRQ_CMD;
2530 tx_crq.v1.type = IBMVNIC_TX_DESC;
2531 tx_crq.v1.n_crq_elem = 1;
2532 tx_crq.v1.n_sge = 1;
2533 tx_crq.v1.flags1 = IBMVNIC_TX_COMP_NEEDED;
2534
2535 if (skb_is_gso(skb))
2536 tx_crq.v1.correlator =
2537 cpu_to_be32(bufidx | IBMVNIC_TSO_POOL_MASK);
2538 else
2539 tx_crq.v1.correlator = cpu_to_be32(bufidx);
2540 tx_crq.v1.dma_reg = cpu_to_be16(ltb->map_id);
2541 tx_crq.v1.sge_len = cpu_to_be32(skb->len);
2542 tx_crq.v1.ioba = cpu_to_be64(data_dma_addr);
2543
2544 if (adapter->vlan_header_insertion && skb_vlan_tag_present(skb)) {
2545 tx_crq.v1.flags2 |= IBMVNIC_TX_VLAN_INSERT;
2546 tx_crq.v1.vlan_id = cpu_to_be16(skb->vlan_tci);
2547 }
2548
2549 if (skb->protocol == htons(ETH_P_IP)) {
2550 tx_crq.v1.flags1 |= IBMVNIC_TX_PROT_IPV4;
2551 proto = ip_hdr(skb)->protocol;
2552 } else if (skb->protocol == htons(ETH_P_IPV6)) {
2553 tx_crq.v1.flags1 |= IBMVNIC_TX_PROT_IPV6;
2554 proto = ipv6_hdr(skb)->nexthdr;
2555 }
2556
2557 if (proto == IPPROTO_TCP)
2558 tx_crq.v1.flags1 |= IBMVNIC_TX_PROT_TCP;
2559 else if (proto == IPPROTO_UDP)
2560 tx_crq.v1.flags1 |= IBMVNIC_TX_PROT_UDP;
2561
2562 if (skb->ip_summed == CHECKSUM_PARTIAL) {
2563 tx_crq.v1.flags1 |= IBMVNIC_TX_CHKSUM_OFFLOAD;
2564 hdrs += 2;
2565 }
2566 if (skb_is_gso(skb)) {
2567 tx_crq.v1.flags1 |= IBMVNIC_TX_LSO;
2568 tx_crq.v1.mss = cpu_to_be16(skb_shinfo(skb)->gso_size);
2569 hdrs += 2;
2570 } else if (use_scrq_send_direct) {
2571 /* See above comment, CSO disabled with direct xmit */
2572 tx_crq.v1.flags1 &= ~(IBMVNIC_TX_CHKSUM_OFFLOAD);
2573 ind_bufp->index = 1;
2574 tx_buff->num_entries = 1;
2575 netdev_tx_sent_queue(txq, skb->len);
2576 ind_bufp->indir_arr[0] = tx_crq;
2577 lpar_rc = ibmvnic_tx_scrq_flush(adapter, tx_scrq, false);
2578 if (lpar_rc != H_SUCCESS)
2579 goto tx_err;
2580
2581 tx_dpackets++;
2582 goto early_exit;
2583 }
2584
2585 if ((*hdrs >> 7) & 1)
2586 build_hdr_descs_arr(skb, indir_arr, &num_entries, *hdrs);
2587
2588 tx_crq.v1.n_crq_elem = num_entries;
2589 tx_buff->num_entries = num_entries;
2590 /* flush buffer if current entry can not fit */
2591 if (num_entries + ind_bufp->index > IBMVNIC_MAX_IND_DESCS) {
2592 lpar_rc = ibmvnic_tx_scrq_flush(adapter, tx_scrq, true);
2593 if (lpar_rc != H_SUCCESS)
2594 goto tx_flush_err;
2595 }
2596
2597 indir_arr[0] = tx_crq;
2598 memcpy(&ind_bufp->indir_arr[ind_bufp->index], &indir_arr[0],
2599 num_entries * sizeof(struct ibmvnic_generic_scrq));
2600
2601 ind_bufp->index += num_entries;
2602 if (__netdev_tx_sent_queue(txq, skb->len,
2603 netdev_xmit_more() &&
2604 ind_bufp->index < IBMVNIC_MAX_IND_DESCS)) {
2605 lpar_rc = ibmvnic_tx_scrq_flush(adapter, tx_scrq, true);
2606 if (lpar_rc != H_SUCCESS)
2607 goto tx_err;
2608 }
2609
2610 tx_bpackets++;
2611
2612early_exit:
2613 if (atomic_add_return(num_entries, &tx_scrq->used)
2614 >= adapter->req_tx_entries_per_subcrq) {
2615 netdev_dbg(netdev, "Stopping queue %d\n", queue_num);
2616 netif_stop_subqueue(netdev, queue_num);
2617 }
2618
2619 tx_bytes += skblen;
2620 txq_trans_cond_update(txq);
2621 ret = NETDEV_TX_OK;
2622 goto out;
2623
2624tx_flush_err:
2625 dev_kfree_skb_any(skb);
2626 tx_buff->skb = NULL;
2627 tx_pool->consumer_index = tx_pool->consumer_index == 0 ?
2628 tx_pool->num_buffers - 1 :
2629 tx_pool->consumer_index - 1;
2630 tx_dropped++;
2631tx_err:
2632 if (lpar_rc != H_CLOSED && lpar_rc != H_PARAMETER)
2633 dev_err_ratelimited(dev, "tx: send failed\n");
2634
2635 if (lpar_rc == H_CLOSED || adapter->failover_pending) {
2636 /* Disable TX and report carrier off if queue is closed
2637 * or pending failover.
2638 * Firmware guarantees that a signal will be sent to the
2639 * driver, triggering a reset or some other action.
2640 */
2641 netif_tx_stop_all_queues(netdev);
2642 netif_carrier_off(netdev);
2643 }
2644out:
2645 rcu_read_unlock();
2646 netdev->stats.tx_dropped += tx_dropped;
2647 netdev->stats.tx_bytes += tx_bytes;
2648 netdev->stats.tx_packets += tx_bpackets + tx_dpackets;
2649 adapter->tx_send_failed += tx_send_failed;
2650 adapter->tx_map_failed += tx_map_failed;
2651 adapter->tx_stats_buffers[queue_num].batched_packets += tx_bpackets;
2652 adapter->tx_stats_buffers[queue_num].direct_packets += tx_dpackets;
2653 adapter->tx_stats_buffers[queue_num].bytes += tx_bytes;
2654 adapter->tx_stats_buffers[queue_num].dropped_packets += tx_dropped;
2655
2656 return ret;
2657}
2658
2659static void ibmvnic_set_multi(struct net_device *netdev)
2660{
2661 struct ibmvnic_adapter *adapter = netdev_priv(netdev);
2662 struct netdev_hw_addr *ha;
2663 union ibmvnic_crq crq;
2664
2665 memset(&crq, 0, sizeof(crq));
2666 crq.request_capability.first = IBMVNIC_CRQ_CMD;
2667 crq.request_capability.cmd = REQUEST_CAPABILITY;
2668
2669 if (netdev->flags & IFF_PROMISC) {
2670 if (!adapter->promisc_supported)
2671 return;
2672 } else {
2673 if (netdev->flags & IFF_ALLMULTI) {
2674 /* Accept all multicast */
2675 memset(&crq, 0, sizeof(crq));
2676 crq.multicast_ctrl.first = IBMVNIC_CRQ_CMD;
2677 crq.multicast_ctrl.cmd = MULTICAST_CTRL;
2678 crq.multicast_ctrl.flags = IBMVNIC_ENABLE_ALL;
2679 ibmvnic_send_crq(adapter, &crq);
2680 } else if (netdev_mc_empty(netdev)) {
2681 /* Reject all multicast */
2682 memset(&crq, 0, sizeof(crq));
2683 crq.multicast_ctrl.first = IBMVNIC_CRQ_CMD;
2684 crq.multicast_ctrl.cmd = MULTICAST_CTRL;
2685 crq.multicast_ctrl.flags = IBMVNIC_DISABLE_ALL;
2686 ibmvnic_send_crq(adapter, &crq);
2687 } else {
2688 /* Accept one or more multicast(s) */
2689 netdev_for_each_mc_addr(ha, netdev) {
2690 memset(&crq, 0, sizeof(crq));
2691 crq.multicast_ctrl.first = IBMVNIC_CRQ_CMD;
2692 crq.multicast_ctrl.cmd = MULTICAST_CTRL;
2693 crq.multicast_ctrl.flags = IBMVNIC_ENABLE_MC;
2694 ether_addr_copy(&crq.multicast_ctrl.mac_addr[0],
2695 ha->addr);
2696 ibmvnic_send_crq(adapter, &crq);
2697 }
2698 }
2699 }
2700}
2701
2702static int __ibmvnic_set_mac(struct net_device *netdev, u8 *dev_addr)
2703{
2704 struct ibmvnic_adapter *adapter = netdev_priv(netdev);
2705 union ibmvnic_crq crq;
2706 int rc;
2707
2708 if (!is_valid_ether_addr(dev_addr)) {
2709 rc = -EADDRNOTAVAIL;
2710 goto err;
2711 }
2712
2713 memset(&crq, 0, sizeof(crq));
2714 crq.change_mac_addr.first = IBMVNIC_CRQ_CMD;
2715 crq.change_mac_addr.cmd = CHANGE_MAC_ADDR;
2716 ether_addr_copy(&crq.change_mac_addr.mac_addr[0], dev_addr);
2717
2718 mutex_lock(&adapter->fw_lock);
2719 adapter->fw_done_rc = 0;
2720 reinit_completion(&adapter->fw_done);
2721
2722 rc = ibmvnic_send_crq(adapter, &crq);
2723 if (rc) {
2724 rc = -EIO;
2725 mutex_unlock(&adapter->fw_lock);
2726 goto err;
2727 }
2728
2729 rc = ibmvnic_wait_for_completion(adapter, &adapter->fw_done, 10000);
2730 /* netdev->dev_addr is changed in handle_change_mac_rsp function */
2731 if (rc || adapter->fw_done_rc) {
2732 rc = -EIO;
2733 mutex_unlock(&adapter->fw_lock);
2734 goto err;
2735 }
2736 mutex_unlock(&adapter->fw_lock);
2737 return 0;
2738err:
2739 ether_addr_copy(adapter->mac_addr, netdev->dev_addr);
2740 return rc;
2741}
2742
2743static int ibmvnic_set_mac(struct net_device *netdev, void *p)
2744{
2745 struct ibmvnic_adapter *adapter = netdev_priv(netdev);
2746 struct sockaddr *addr = p;
2747 int rc;
2748
2749 rc = 0;
2750 if (!is_valid_ether_addr(addr->sa_data))
2751 return -EADDRNOTAVAIL;
2752
2753 ether_addr_copy(adapter->mac_addr, addr->sa_data);
2754 if (adapter->state != VNIC_PROBED)
2755 rc = __ibmvnic_set_mac(netdev, addr->sa_data);
2756
2757 return rc;
2758}
2759
2760static const char *reset_reason_to_string(enum ibmvnic_reset_reason reason)
2761{
2762 switch (reason) {
2763 case VNIC_RESET_FAILOVER:
2764 return "FAILOVER";
2765 case VNIC_RESET_MOBILITY:
2766 return "MOBILITY";
2767 case VNIC_RESET_FATAL:
2768 return "FATAL";
2769 case VNIC_RESET_NON_FATAL:
2770 return "NON_FATAL";
2771 case VNIC_RESET_TIMEOUT:
2772 return "TIMEOUT";
2773 case VNIC_RESET_CHANGE_PARAM:
2774 return "CHANGE_PARAM";
2775 case VNIC_RESET_PASSIVE_INIT:
2776 return "PASSIVE_INIT";
2777 }
2778 return "UNKNOWN";
2779}
2780
2781/*
2782 * Initialize the init_done completion and return code values. We
2783 * can get a transport event just after registering the CRQ and the
2784 * tasklet will use this to communicate the transport event. To ensure
2785 * we don't miss the notification/error, initialize these _before_
2786 * regisering the CRQ.
2787 */
2788static inline void reinit_init_done(struct ibmvnic_adapter *adapter)
2789{
2790 reinit_completion(&adapter->init_done);
2791 adapter->init_done_rc = 0;
2792}
2793
2794/*
2795 * do_reset returns zero if we are able to keep processing reset events, or
2796 * non-zero if we hit a fatal error and must halt.
2797 */
2798static int do_reset(struct ibmvnic_adapter *adapter,
2799 struct ibmvnic_rwi *rwi, u32 reset_state)
2800{
2801 struct net_device *netdev = adapter->netdev;
2802 u64 old_num_rx_queues, old_num_tx_queues;
2803 u64 old_num_rx_slots, old_num_tx_slots;
2804 int rc;
2805
2806 netdev_dbg(adapter->netdev,
2807 "[S:%s FOP:%d] Reset reason: %s, reset_state: %s\n",
2808 adapter_state_to_string(adapter->state),
2809 adapter->failover_pending,
2810 reset_reason_to_string(rwi->reset_reason),
2811 adapter_state_to_string(reset_state));
2812
2813 adapter->reset_reason = rwi->reset_reason;
2814 /* requestor of VNIC_RESET_CHANGE_PARAM already has the rtnl lock */
2815 if (!(adapter->reset_reason == VNIC_RESET_CHANGE_PARAM))
2816 rtnl_lock();
2817
2818 /* Now that we have the rtnl lock, clear any pending failover.
2819 * This will ensure ibmvnic_open() has either completed or will
2820 * block until failover is complete.
2821 */
2822 if (rwi->reset_reason == VNIC_RESET_FAILOVER)
2823 adapter->failover_pending = false;
2824
2825 /* read the state and check (again) after getting rtnl */
2826 reset_state = adapter->state;
2827
2828 if (reset_state == VNIC_REMOVING || reset_state == VNIC_REMOVED) {
2829 rc = -EBUSY;
2830 goto out;
2831 }
2832
2833 netif_carrier_off(netdev);
2834
2835 old_num_rx_queues = adapter->req_rx_queues;
2836 old_num_tx_queues = adapter->req_tx_queues;
2837 old_num_rx_slots = adapter->req_rx_add_entries_per_subcrq;
2838 old_num_tx_slots = adapter->req_tx_entries_per_subcrq;
2839
2840 ibmvnic_cleanup(netdev);
2841
2842 if (reset_state == VNIC_OPEN &&
2843 adapter->reset_reason != VNIC_RESET_MOBILITY &&
2844 adapter->reset_reason != VNIC_RESET_FAILOVER) {
2845 if (adapter->reset_reason == VNIC_RESET_CHANGE_PARAM) {
2846 rc = __ibmvnic_close(netdev);
2847 if (rc)
2848 goto out;
2849 } else {
2850 adapter->state = VNIC_CLOSING;
2851
2852 /* Release the RTNL lock before link state change and
2853 * re-acquire after the link state change to allow
2854 * linkwatch_event to grab the RTNL lock and run during
2855 * a reset.
2856 */
2857 rtnl_unlock();
2858 rc = set_link_state(adapter, IBMVNIC_LOGICAL_LNK_DN);
2859 rtnl_lock();
2860 if (rc)
2861 goto out;
2862
2863 if (adapter->state == VNIC_OPEN) {
2864 /* When we dropped rtnl, ibmvnic_open() got
2865 * it and noticed that we are resetting and
2866 * set the adapter state to OPEN. Update our
2867 * new "target" state, and resume the reset
2868 * from VNIC_CLOSING state.
2869 */
2870 netdev_dbg(netdev,
2871 "Open changed state from %s, updating.\n",
2872 adapter_state_to_string(reset_state));
2873 reset_state = VNIC_OPEN;
2874 adapter->state = VNIC_CLOSING;
2875 }
2876
2877 if (adapter->state != VNIC_CLOSING) {
2878 /* If someone else changed the adapter state
2879 * when we dropped the rtnl, fail the reset
2880 */
2881 rc = -EAGAIN;
2882 goto out;
2883 }
2884 adapter->state = VNIC_CLOSED;
2885 }
2886 }
2887
2888 if (adapter->reset_reason == VNIC_RESET_CHANGE_PARAM) {
2889 release_resources(adapter);
2890 release_sub_crqs(adapter, 1);
2891 release_crq_queue(adapter);
2892 }
2893
2894 if (adapter->reset_reason != VNIC_RESET_NON_FATAL) {
2895 /* remove the closed state so when we call open it appears
2896 * we are coming from the probed state.
2897 */
2898 adapter->state = VNIC_PROBED;
2899
2900 reinit_init_done(adapter);
2901
2902 if (adapter->reset_reason == VNIC_RESET_CHANGE_PARAM) {
2903 rc = init_crq_queue(adapter);
2904 } else if (adapter->reset_reason == VNIC_RESET_MOBILITY) {
2905 rc = ibmvnic_reenable_crq_queue(adapter);
2906 release_sub_crqs(adapter, 1);
2907 } else {
2908 rc = ibmvnic_reset_crq(adapter);
2909 if (rc == H_CLOSED || rc == H_SUCCESS) {
2910 rc = vio_enable_interrupts(adapter->vdev);
2911 if (rc)
2912 netdev_err(adapter->netdev,
2913 "Reset failed to enable interrupts. rc=%d\n",
2914 rc);
2915 }
2916 }
2917
2918 if (rc) {
2919 netdev_err(adapter->netdev,
2920 "Reset couldn't initialize crq. rc=%d\n", rc);
2921 goto out;
2922 }
2923
2924 rc = ibmvnic_reset_init(adapter, true);
2925 if (rc)
2926 goto out;
2927
2928 /* If the adapter was in PROBE or DOWN state prior to the reset,
2929 * exit here.
2930 */
2931 if (reset_state == VNIC_PROBED || reset_state == VNIC_DOWN) {
2932 rc = 0;
2933 goto out;
2934 }
2935
2936 rc = ibmvnic_login(netdev);
2937 if (rc)
2938 goto out;
2939
2940 if (adapter->reset_reason == VNIC_RESET_CHANGE_PARAM) {
2941 rc = init_resources(adapter);
2942 if (rc)
2943 goto out;
2944 } else if (adapter->req_rx_queues != old_num_rx_queues ||
2945 adapter->req_tx_queues != old_num_tx_queues ||
2946 adapter->req_rx_add_entries_per_subcrq !=
2947 old_num_rx_slots ||
2948 adapter->req_tx_entries_per_subcrq !=
2949 old_num_tx_slots ||
2950 !adapter->rx_pool ||
2951 !adapter->tso_pool ||
2952 !adapter->tx_pool) {
2953 release_napi(adapter);
2954 release_vpd_data(adapter);
2955
2956 rc = init_resources(adapter);
2957 if (rc)
2958 goto out;
2959
2960 } else {
2961 rc = init_tx_pools(netdev);
2962 if (rc) {
2963 netdev_dbg(netdev,
2964 "init tx pools failed (%d)\n",
2965 rc);
2966 goto out;
2967 }
2968
2969 rc = init_rx_pools(netdev);
2970 if (rc) {
2971 netdev_dbg(netdev,
2972 "init rx pools failed (%d)\n",
2973 rc);
2974 goto out;
2975 }
2976 }
2977 ibmvnic_disable_irqs(adapter);
2978 }
2979 adapter->state = VNIC_CLOSED;
2980
2981 if (reset_state == VNIC_CLOSED) {
2982 rc = 0;
2983 goto out;
2984 }
2985
2986 rc = __ibmvnic_open(netdev);
2987 if (rc) {
2988 rc = IBMVNIC_OPEN_FAILED;
2989 goto out;
2990 }
2991
2992 /* refresh device's multicast list */
2993 ibmvnic_set_multi(netdev);
2994
2995 if (adapter->reset_reason == VNIC_RESET_FAILOVER ||
2996 adapter->reset_reason == VNIC_RESET_MOBILITY)
2997 __netdev_notify_peers(netdev);
2998
2999 rc = 0;
3000
3001out:
3002 /* restore the adapter state if reset failed */
3003 if (rc)
3004 adapter->state = reset_state;
3005 /* requestor of VNIC_RESET_CHANGE_PARAM should still hold the rtnl lock */
3006 if (!(adapter->reset_reason == VNIC_RESET_CHANGE_PARAM))
3007 rtnl_unlock();
3008
3009 netdev_dbg(adapter->netdev, "[S:%s FOP:%d] Reset done, rc %d\n",
3010 adapter_state_to_string(adapter->state),
3011 adapter->failover_pending, rc);
3012 return rc;
3013}
3014
3015static int do_hard_reset(struct ibmvnic_adapter *adapter,
3016 struct ibmvnic_rwi *rwi, u32 reset_state)
3017{
3018 struct net_device *netdev = adapter->netdev;
3019 int rc;
3020
3021 netdev_dbg(adapter->netdev, "Hard resetting driver (%s)\n",
3022 reset_reason_to_string(rwi->reset_reason));
3023
3024 /* read the state and check (again) after getting rtnl */
3025 reset_state = adapter->state;
3026
3027 if (reset_state == VNIC_REMOVING || reset_state == VNIC_REMOVED) {
3028 rc = -EBUSY;
3029 goto out;
3030 }
3031
3032 netif_carrier_off(netdev);
3033 adapter->reset_reason = rwi->reset_reason;
3034
3035 ibmvnic_cleanup(netdev);
3036 release_resources(adapter);
3037 release_sub_crqs(adapter, 0);
3038 release_crq_queue(adapter);
3039
3040 /* remove the closed state so when we call open it appears
3041 * we are coming from the probed state.
3042 */
3043 adapter->state = VNIC_PROBED;
3044
3045 reinit_init_done(adapter);
3046
3047 rc = init_crq_queue(adapter);
3048 if (rc) {
3049 netdev_err(adapter->netdev,
3050 "Couldn't initialize crq. rc=%d\n", rc);
3051 goto out;
3052 }
3053
3054 rc = ibmvnic_reset_init(adapter, false);
3055 if (rc)
3056 goto out;
3057
3058 /* If the adapter was in PROBE or DOWN state prior to the reset,
3059 * exit here.
3060 */
3061 if (reset_state == VNIC_PROBED || reset_state == VNIC_DOWN)
3062 goto out;
3063
3064 rc = ibmvnic_login(netdev);
3065 if (rc)
3066 goto out;
3067
3068 rc = init_resources(adapter);
3069 if (rc)
3070 goto out;
3071
3072 ibmvnic_disable_irqs(adapter);
3073 adapter->state = VNIC_CLOSED;
3074
3075 if (reset_state == VNIC_CLOSED)
3076 goto out;
3077
3078 rc = __ibmvnic_open(netdev);
3079 if (rc) {
3080 rc = IBMVNIC_OPEN_FAILED;
3081 goto out;
3082 }
3083
3084 __netdev_notify_peers(netdev);
3085out:
3086 /* restore adapter state if reset failed */
3087 if (rc)
3088 adapter->state = reset_state;
3089 netdev_dbg(adapter->netdev, "[S:%s FOP:%d] Hard reset done, rc %d\n",
3090 adapter_state_to_string(adapter->state),
3091 adapter->failover_pending, rc);
3092 return rc;
3093}
3094
3095static struct ibmvnic_rwi *get_next_rwi(struct ibmvnic_adapter *adapter)
3096{
3097 struct ibmvnic_rwi *rwi;
3098 unsigned long flags;
3099
3100 spin_lock_irqsave(&adapter->rwi_lock, flags);
3101
3102 if (!list_empty(&adapter->rwi_list)) {
3103 rwi = list_first_entry(&adapter->rwi_list, struct ibmvnic_rwi,
3104 list);
3105 list_del(&rwi->list);
3106 } else {
3107 rwi = NULL;
3108 }
3109
3110 spin_unlock_irqrestore(&adapter->rwi_lock, flags);
3111 return rwi;
3112}
3113
3114/**
3115 * do_passive_init - complete probing when partner device is detected.
3116 * @adapter: ibmvnic_adapter struct
3117 *
3118 * If the ibmvnic device does not have a partner device to communicate with at boot
3119 * and that partner device comes online at a later time, this function is called
3120 * to complete the initialization process of ibmvnic device.
3121 * Caller is expected to hold rtnl_lock().
3122 *
3123 * Returns non-zero if sub-CRQs are not initialized properly leaving the device
3124 * in the down state.
3125 * Returns 0 upon success and the device is in PROBED state.
3126 */
3127
3128static int do_passive_init(struct ibmvnic_adapter *adapter)
3129{
3130 unsigned long timeout = msecs_to_jiffies(30000);
3131 struct net_device *netdev = adapter->netdev;
3132 struct device *dev = &adapter->vdev->dev;
3133 int rc;
3134
3135 netdev_dbg(netdev, "Partner device found, probing.\n");
3136
3137 adapter->state = VNIC_PROBING;
3138 reinit_completion(&adapter->init_done);
3139 adapter->init_done_rc = 0;
3140 adapter->crq.active = true;
3141
3142 rc = send_crq_init_complete(adapter);
3143 if (rc)
3144 goto out;
3145
3146 rc = send_version_xchg(adapter);
3147 if (rc)
3148 netdev_dbg(adapter->netdev, "send_version_xchg failed, rc=%d\n", rc);
3149
3150 if (!wait_for_completion_timeout(&adapter->init_done, timeout)) {
3151 dev_err(dev, "Initialization sequence timed out\n");
3152 rc = -ETIMEDOUT;
3153 goto out;
3154 }
3155
3156 rc = init_sub_crqs(adapter);
3157 if (rc) {
3158 dev_err(dev, "Initialization of sub crqs failed, rc=%d\n", rc);
3159 goto out;
3160 }
3161
3162 rc = init_sub_crq_irqs(adapter);
3163 if (rc) {
3164 dev_err(dev, "Failed to initialize sub crq irqs\n, rc=%d", rc);
3165 goto init_failed;
3166 }
3167
3168 netdev->mtu = adapter->req_mtu - ETH_HLEN;
3169 netdev->min_mtu = adapter->min_mtu - ETH_HLEN;
3170 netdev->max_mtu = adapter->max_mtu - ETH_HLEN;
3171
3172 adapter->state = VNIC_PROBED;
3173 netdev_dbg(netdev, "Probed successfully. Waiting for signal from partner device.\n");
3174
3175 return 0;
3176
3177init_failed:
3178 release_sub_crqs(adapter, 1);
3179out:
3180 adapter->state = VNIC_DOWN;
3181 return rc;
3182}
3183
3184static void __ibmvnic_reset(struct work_struct *work)
3185{
3186 struct ibmvnic_adapter *adapter;
3187 unsigned int timeout = 5000;
3188 struct ibmvnic_rwi *tmprwi;
3189 bool saved_state = false;
3190 struct ibmvnic_rwi *rwi;
3191 unsigned long flags;
3192 struct device *dev;
3193 bool need_reset;
3194 int num_fails = 0;
3195 u32 reset_state;
3196 int rc = 0;
3197
3198 adapter = container_of(work, struct ibmvnic_adapter, ibmvnic_reset);
3199 dev = &adapter->vdev->dev;
3200
3201 /* Wait for ibmvnic_probe() to complete. If probe is taking too long
3202 * or if another reset is in progress, defer work for now. If probe
3203 * eventually fails it will flush and terminate our work.
3204 *
3205 * Three possibilities here:
3206 * 1. Adpater being removed - just return
3207 * 2. Timed out on probe or another reset in progress - delay the work
3208 * 3. Completed probe - perform any resets in queue
3209 */
3210 if (adapter->state == VNIC_PROBING &&
3211 !wait_for_completion_timeout(&adapter->probe_done, timeout)) {
3212 dev_err(dev, "Reset thread timed out on probe");
3213 queue_delayed_work(system_long_wq,
3214 &adapter->ibmvnic_delayed_reset,
3215 IBMVNIC_RESET_DELAY);
3216 return;
3217 }
3218
3219 /* adapter is done with probe (i.e state is never VNIC_PROBING now) */
3220 if (adapter->state == VNIC_REMOVING)
3221 return;
3222
3223 /* ->rwi_list is stable now (no one else is removing entries) */
3224
3225 /* ibmvnic_probe() may have purged the reset queue after we were
3226 * scheduled to process a reset so there maybe no resets to process.
3227 * Before setting the ->resetting bit though, we have to make sure
3228 * that there is infact a reset to process. Otherwise we may race
3229 * with ibmvnic_open() and end up leaving the vnic down:
3230 *
3231 * __ibmvnic_reset() ibmvnic_open()
3232 * ----------------- --------------
3233 *
3234 * set ->resetting bit
3235 * find ->resetting bit is set
3236 * set ->state to IBMVNIC_OPEN (i.e
3237 * assume reset will open device)
3238 * return
3239 * find reset queue empty
3240 * return
3241 *
3242 * Neither performed vnic login/open and vnic stays down
3243 *
3244 * If we hold the lock and conditionally set the bit, either we
3245 * or ibmvnic_open() will complete the open.
3246 */
3247 need_reset = false;
3248 spin_lock(&adapter->rwi_lock);
3249 if (!list_empty(&adapter->rwi_list)) {
3250 if (test_and_set_bit_lock(0, &adapter->resetting)) {
3251 queue_delayed_work(system_long_wq,
3252 &adapter->ibmvnic_delayed_reset,
3253 IBMVNIC_RESET_DELAY);
3254 } else {
3255 need_reset = true;
3256 }
3257 }
3258 spin_unlock(&adapter->rwi_lock);
3259
3260 if (!need_reset)
3261 return;
3262
3263 rwi = get_next_rwi(adapter);
3264 while (rwi) {
3265 spin_lock_irqsave(&adapter->state_lock, flags);
3266
3267 if (adapter->state == VNIC_REMOVING ||
3268 adapter->state == VNIC_REMOVED) {
3269 spin_unlock_irqrestore(&adapter->state_lock, flags);
3270 kfree(rwi);
3271 rc = EBUSY;
3272 break;
3273 }
3274
3275 if (!saved_state) {
3276 reset_state = adapter->state;
3277 saved_state = true;
3278 }
3279 spin_unlock_irqrestore(&adapter->state_lock, flags);
3280
3281 if (rwi->reset_reason == VNIC_RESET_PASSIVE_INIT) {
3282 rtnl_lock();
3283 rc = do_passive_init(adapter);
3284 rtnl_unlock();
3285 if (!rc)
3286 netif_carrier_on(adapter->netdev);
3287 } else if (adapter->force_reset_recovery) {
3288 /* Since we are doing a hard reset now, clear the
3289 * failover_pending flag so we don't ignore any
3290 * future MOBILITY or other resets.
3291 */
3292 adapter->failover_pending = false;
3293
3294 /* Transport event occurred during previous reset */
3295 if (adapter->wait_for_reset) {
3296 /* Previous was CHANGE_PARAM; caller locked */
3297 adapter->force_reset_recovery = false;
3298 rc = do_hard_reset(adapter, rwi, reset_state);
3299 } else {
3300 rtnl_lock();
3301 adapter->force_reset_recovery = false;
3302 rc = do_hard_reset(adapter, rwi, reset_state);
3303 rtnl_unlock();
3304 }
3305 if (rc)
3306 num_fails++;
3307 else
3308 num_fails = 0;
3309
3310 /* If auto-priority-failover is enabled we can get
3311 * back to back failovers during resets, resulting
3312 * in at least two failed resets (from high-priority
3313 * backing device to low-priority one and then back)
3314 * If resets continue to fail beyond that, give the
3315 * adapter some time to settle down before retrying.
3316 */
3317 if (num_fails >= 3) {
3318 netdev_dbg(adapter->netdev,
3319 "[S:%s] Hard reset failed %d times, waiting 60 secs\n",
3320 adapter_state_to_string(adapter->state),
3321 num_fails);
3322 set_current_state(TASK_UNINTERRUPTIBLE);
3323 schedule_timeout(60 * HZ);
3324 }
3325 } else {
3326 rc = do_reset(adapter, rwi, reset_state);
3327 }
3328 tmprwi = rwi;
3329 adapter->last_reset_time = jiffies;
3330
3331 if (rc)
3332 netdev_dbg(adapter->netdev, "Reset failed, rc=%d\n", rc);
3333
3334 rwi = get_next_rwi(adapter);
3335
3336 /*
3337 * If there are no resets queued and the previous reset failed,
3338 * the adapter would be in an undefined state. So retry the
3339 * previous reset as a hard reset.
3340 *
3341 * Else, free the previous rwi and, if there is another reset
3342 * queued, process the new reset even if previous reset failed
3343 * (the previous reset could have failed because of a fail
3344 * over for instance, so process the fail over).
3345 */
3346 if (!rwi && rc)
3347 rwi = tmprwi;
3348 else
3349 kfree(tmprwi);
3350
3351 if (rwi && (rwi->reset_reason == VNIC_RESET_FAILOVER ||
3352 rwi->reset_reason == VNIC_RESET_MOBILITY || rc))
3353 adapter->force_reset_recovery = true;
3354 }
3355
3356 if (adapter->wait_for_reset) {
3357 adapter->reset_done_rc = rc;
3358 complete(&adapter->reset_done);
3359 }
3360
3361 clear_bit_unlock(0, &adapter->resetting);
3362
3363 netdev_dbg(adapter->netdev,
3364 "[S:%s FRR:%d WFR:%d] Done processing resets\n",
3365 adapter_state_to_string(adapter->state),
3366 adapter->force_reset_recovery,
3367 adapter->wait_for_reset);
3368}
3369
3370static void __ibmvnic_delayed_reset(struct work_struct *work)
3371{
3372 struct ibmvnic_adapter *adapter;
3373
3374 adapter = container_of(work, struct ibmvnic_adapter,
3375 ibmvnic_delayed_reset.work);
3376 __ibmvnic_reset(&adapter->ibmvnic_reset);
3377}
3378
3379static void flush_reset_queue(struct ibmvnic_adapter *adapter)
3380{
3381 struct list_head *entry, *tmp_entry;
3382
3383 if (!list_empty(&adapter->rwi_list)) {
3384 list_for_each_safe(entry, tmp_entry, &adapter->rwi_list) {
3385 list_del(entry);
3386 kfree(list_entry(entry, struct ibmvnic_rwi, list));
3387 }
3388 }
3389}
3390
3391static int ibmvnic_reset(struct ibmvnic_adapter *adapter,
3392 enum ibmvnic_reset_reason reason)
3393{
3394 struct net_device *netdev = adapter->netdev;
3395 struct ibmvnic_rwi *rwi, *tmp;
3396 unsigned long flags;
3397 int ret;
3398
3399 spin_lock_irqsave(&adapter->rwi_lock, flags);
3400
3401 /* If failover is pending don't schedule any other reset.
3402 * Instead let the failover complete. If there is already a
3403 * a failover reset scheduled, we will detect and drop the
3404 * duplicate reset when walking the ->rwi_list below.
3405 */
3406 if (adapter->state == VNIC_REMOVING ||
3407 adapter->state == VNIC_REMOVED ||
3408 (adapter->failover_pending && reason != VNIC_RESET_FAILOVER)) {
3409 ret = EBUSY;
3410 netdev_dbg(netdev, "Adapter removing or pending failover, skipping reset\n");
3411 goto err;
3412 }
3413
3414 list_for_each_entry(tmp, &adapter->rwi_list, list) {
3415 if (tmp->reset_reason == reason) {
3416 netdev_dbg(netdev, "Skipping matching reset, reason=%s\n",
3417 reset_reason_to_string(reason));
3418 ret = EBUSY;
3419 goto err;
3420 }
3421 }
3422
3423 rwi = kzalloc(sizeof(*rwi), GFP_ATOMIC);
3424 if (!rwi) {
3425 ret = ENOMEM;
3426 goto err;
3427 }
3428 /* if we just received a transport event,
3429 * flush reset queue and process this reset
3430 */
3431 if (adapter->force_reset_recovery)
3432 flush_reset_queue(adapter);
3433
3434 rwi->reset_reason = reason;
3435 list_add_tail(&rwi->list, &adapter->rwi_list);
3436 netdev_dbg(adapter->netdev, "Scheduling reset (reason %s)\n",
3437 reset_reason_to_string(reason));
3438 queue_work(system_long_wq, &adapter->ibmvnic_reset);
3439
3440 ret = 0;
3441err:
3442 /* ibmvnic_close() below can block, so drop the lock first */
3443 spin_unlock_irqrestore(&adapter->rwi_lock, flags);
3444
3445 if (ret == ENOMEM)
3446 ibmvnic_close(netdev);
3447
3448 return -ret;
3449}
3450
3451static void ibmvnic_tx_timeout(struct net_device *dev, unsigned int txqueue)
3452{
3453 struct ibmvnic_adapter *adapter = netdev_priv(dev);
3454
3455 if (test_bit(0, &adapter->resetting)) {
3456 netdev_err(adapter->netdev,
3457 "Adapter is resetting, skip timeout reset\n");
3458 return;
3459 }
3460 /* No queuing up reset until at least 5 seconds (default watchdog val)
3461 * after last reset
3462 */
3463 if (time_before(jiffies, (adapter->last_reset_time + dev->watchdog_timeo))) {
3464 netdev_dbg(dev, "Not yet time to tx timeout.\n");
3465 return;
3466 }
3467 ibmvnic_reset(adapter, VNIC_RESET_TIMEOUT);
3468}
3469
3470static void remove_buff_from_pool(struct ibmvnic_adapter *adapter,
3471 struct ibmvnic_rx_buff *rx_buff)
3472{
3473 struct ibmvnic_rx_pool *pool = &adapter->rx_pool[rx_buff->pool_index];
3474
3475 rx_buff->skb = NULL;
3476
3477 pool->free_map[pool->next_alloc] = (int)(rx_buff - pool->rx_buff);
3478 pool->next_alloc = (pool->next_alloc + 1) % pool->size;
3479
3480 atomic_dec(&pool->available);
3481}
3482
3483static int ibmvnic_poll(struct napi_struct *napi, int budget)
3484{
3485 struct ibmvnic_sub_crq_queue *rx_scrq;
3486 struct ibmvnic_adapter *adapter;
3487 struct net_device *netdev;
3488 int frames_processed;
3489 int scrq_num;
3490
3491 netdev = napi->dev;
3492 adapter = netdev_priv(netdev);
3493 scrq_num = (int)(napi - adapter->napi);
3494 frames_processed = 0;
3495 rx_scrq = adapter->rx_scrq[scrq_num];
3496
3497restart_poll:
3498 while (frames_processed < budget) {
3499 struct sk_buff *skb;
3500 struct ibmvnic_rx_buff *rx_buff;
3501 union sub_crq *next;
3502 u32 length;
3503 u16 offset;
3504 u8 flags = 0;
3505
3506 if (unlikely(test_bit(0, &adapter->resetting) &&
3507 adapter->reset_reason != VNIC_RESET_NON_FATAL)) {
3508 enable_scrq_irq(adapter, rx_scrq);
3509 napi_complete_done(napi, frames_processed);
3510 return frames_processed;
3511 }
3512
3513 if (!pending_scrq(adapter, rx_scrq))
3514 break;
3515 next = ibmvnic_next_scrq(adapter, rx_scrq);
3516 rx_buff = (struct ibmvnic_rx_buff *)
3517 be64_to_cpu(next->rx_comp.correlator);
3518 /* do error checking */
3519 if (next->rx_comp.rc) {
3520 netdev_dbg(netdev, "rx buffer returned with rc %x\n",
3521 be16_to_cpu(next->rx_comp.rc));
3522 /* free the entry */
3523 next->rx_comp.first = 0;
3524 dev_kfree_skb_any(rx_buff->skb);
3525 remove_buff_from_pool(adapter, rx_buff);
3526 continue;
3527 } else if (!rx_buff->skb) {
3528 /* free the entry */
3529 next->rx_comp.first = 0;
3530 remove_buff_from_pool(adapter, rx_buff);
3531 continue;
3532 }
3533
3534 length = be32_to_cpu(next->rx_comp.len);
3535 offset = be16_to_cpu(next->rx_comp.off_frame_data);
3536 flags = next->rx_comp.flags;
3537 skb = rx_buff->skb;
3538 /* load long_term_buff before copying to skb */
3539 dma_rmb();
3540 skb_copy_to_linear_data(skb, rx_buff->data + offset,
3541 length);
3542
3543 /* VLAN Header has been stripped by the system firmware and
3544 * needs to be inserted by the driver
3545 */
3546 if (adapter->rx_vlan_header_insertion &&
3547 (flags & IBMVNIC_VLAN_STRIPPED))
3548 __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
3549 ntohs(next->rx_comp.vlan_tci));
3550
3551 /* free the entry */
3552 next->rx_comp.first = 0;
3553 remove_buff_from_pool(adapter, rx_buff);
3554
3555 skb_put(skb, length);
3556 skb->protocol = eth_type_trans(skb, netdev);
3557 skb_record_rx_queue(skb, scrq_num);
3558
3559 if (flags & IBMVNIC_IP_CHKSUM_GOOD &&
3560 flags & IBMVNIC_TCP_UDP_CHKSUM_GOOD) {
3561 skb->ip_summed = CHECKSUM_UNNECESSARY;
3562 }
3563
3564 length = skb->len;
3565 napi_gro_receive(napi, skb); /* send it up */
3566 netdev->stats.rx_packets++;
3567 netdev->stats.rx_bytes += length;
3568 adapter->rx_stats_buffers[scrq_num].packets++;
3569 adapter->rx_stats_buffers[scrq_num].bytes += length;
3570 frames_processed++;
3571 }
3572
3573 if (adapter->state != VNIC_CLOSING &&
3574 (atomic_read(&adapter->rx_pool[scrq_num].available) <
3575 adapter->req_rx_add_entries_per_subcrq / 2))
3576 replenish_rx_pool(adapter, &adapter->rx_pool[scrq_num]);
3577 if (frames_processed < budget) {
3578 if (napi_complete_done(napi, frames_processed)) {
3579 enable_scrq_irq(adapter, rx_scrq);
3580 if (pending_scrq(adapter, rx_scrq)) {
3581 if (napi_schedule(napi)) {
3582 disable_scrq_irq(adapter, rx_scrq);
3583 goto restart_poll;
3584 }
3585 }
3586 }
3587 }
3588 return frames_processed;
3589}
3590
3591static int wait_for_reset(struct ibmvnic_adapter *adapter)
3592{
3593 int rc, ret;
3594
3595 adapter->fallback.mtu = adapter->req_mtu;
3596 adapter->fallback.rx_queues = adapter->req_rx_queues;
3597 adapter->fallback.tx_queues = adapter->req_tx_queues;
3598 adapter->fallback.rx_entries = adapter->req_rx_add_entries_per_subcrq;
3599 adapter->fallback.tx_entries = adapter->req_tx_entries_per_subcrq;
3600
3601 reinit_completion(&adapter->reset_done);
3602 adapter->wait_for_reset = true;
3603 rc = ibmvnic_reset(adapter, VNIC_RESET_CHANGE_PARAM);
3604
3605 if (rc) {
3606 ret = rc;
3607 goto out;
3608 }
3609 rc = ibmvnic_wait_for_completion(adapter, &adapter->reset_done, 60000);
3610 if (rc) {
3611 ret = -ENODEV;
3612 goto out;
3613 }
3614
3615 ret = 0;
3616 if (adapter->reset_done_rc) {
3617 ret = -EIO;
3618 adapter->desired.mtu = adapter->fallback.mtu;
3619 adapter->desired.rx_queues = adapter->fallback.rx_queues;
3620 adapter->desired.tx_queues = adapter->fallback.tx_queues;
3621 adapter->desired.rx_entries = adapter->fallback.rx_entries;
3622 adapter->desired.tx_entries = adapter->fallback.tx_entries;
3623
3624 reinit_completion(&adapter->reset_done);
3625 adapter->wait_for_reset = true;
3626 rc = ibmvnic_reset(adapter, VNIC_RESET_CHANGE_PARAM);
3627 if (rc) {
3628 ret = rc;
3629 goto out;
3630 }
3631 rc = ibmvnic_wait_for_completion(adapter, &adapter->reset_done,
3632 60000);
3633 if (rc) {
3634 ret = -ENODEV;
3635 goto out;
3636 }
3637 }
3638out:
3639 adapter->wait_for_reset = false;
3640
3641 return ret;
3642}
3643
3644static int ibmvnic_change_mtu(struct net_device *netdev, int new_mtu)
3645{
3646 struct ibmvnic_adapter *adapter = netdev_priv(netdev);
3647
3648 adapter->desired.mtu = new_mtu + ETH_HLEN;
3649
3650 return wait_for_reset(adapter);
3651}
3652
3653static netdev_features_t ibmvnic_features_check(struct sk_buff *skb,
3654 struct net_device *dev,
3655 netdev_features_t features)
3656{
3657 /* Some backing hardware adapters can not
3658 * handle packets with a MSS less than 224
3659 * or with only one segment.
3660 */
3661 if (skb_is_gso(skb)) {
3662 if (skb_shinfo(skb)->gso_size < 224 ||
3663 skb_shinfo(skb)->gso_segs == 1)
3664 features &= ~NETIF_F_GSO_MASK;
3665 }
3666
3667 return features;
3668}
3669
3670static const struct net_device_ops ibmvnic_netdev_ops = {
3671 .ndo_open = ibmvnic_open,
3672 .ndo_stop = ibmvnic_close,
3673 .ndo_start_xmit = ibmvnic_xmit,
3674 .ndo_set_rx_mode = ibmvnic_set_multi,
3675 .ndo_set_mac_address = ibmvnic_set_mac,
3676 .ndo_validate_addr = eth_validate_addr,
3677 .ndo_tx_timeout = ibmvnic_tx_timeout,
3678 .ndo_change_mtu = ibmvnic_change_mtu,
3679 .ndo_features_check = ibmvnic_features_check,
3680};
3681
3682/* ethtool functions */
3683
3684static int ibmvnic_get_link_ksettings(struct net_device *netdev,
3685 struct ethtool_link_ksettings *cmd)
3686{
3687 struct ibmvnic_adapter *adapter = netdev_priv(netdev);
3688 int rc;
3689
3690 rc = send_query_phys_parms(adapter);
3691 if (rc) {
3692 adapter->speed = SPEED_UNKNOWN;
3693 adapter->duplex = DUPLEX_UNKNOWN;
3694 }
3695 cmd->base.speed = adapter->speed;
3696 cmd->base.duplex = adapter->duplex;
3697 cmd->base.port = PORT_FIBRE;
3698 cmd->base.phy_address = 0;
3699 cmd->base.autoneg = AUTONEG_ENABLE;
3700
3701 return 0;
3702}
3703
3704static void ibmvnic_get_drvinfo(struct net_device *netdev,
3705 struct ethtool_drvinfo *info)
3706{
3707 struct ibmvnic_adapter *adapter = netdev_priv(netdev);
3708
3709 strscpy(info->driver, ibmvnic_driver_name, sizeof(info->driver));
3710 strscpy(info->version, IBMVNIC_DRIVER_VERSION, sizeof(info->version));
3711 strscpy(info->fw_version, adapter->fw_version,
3712 sizeof(info->fw_version));
3713}
3714
3715static u32 ibmvnic_get_msglevel(struct net_device *netdev)
3716{
3717 struct ibmvnic_adapter *adapter = netdev_priv(netdev);
3718
3719 return adapter->msg_enable;
3720}
3721
3722static void ibmvnic_set_msglevel(struct net_device *netdev, u32 data)
3723{
3724 struct ibmvnic_adapter *adapter = netdev_priv(netdev);
3725
3726 adapter->msg_enable = data;
3727}
3728
3729static u32 ibmvnic_get_link(struct net_device *netdev)
3730{
3731 struct ibmvnic_adapter *adapter = netdev_priv(netdev);
3732
3733 /* Don't need to send a query because we request a logical link up at
3734 * init and then we wait for link state indications
3735 */
3736 return adapter->logical_link_state;
3737}
3738
3739static void ibmvnic_get_ringparam(struct net_device *netdev,
3740 struct ethtool_ringparam *ring,
3741 struct kernel_ethtool_ringparam *kernel_ring,
3742 struct netlink_ext_ack *extack)
3743{
3744 struct ibmvnic_adapter *adapter = netdev_priv(netdev);
3745
3746 ring->rx_max_pending = adapter->max_rx_add_entries_per_subcrq;
3747 ring->tx_max_pending = adapter->max_tx_entries_per_subcrq;
3748 ring->rx_mini_max_pending = 0;
3749 ring->rx_jumbo_max_pending = 0;
3750 ring->rx_pending = adapter->req_rx_add_entries_per_subcrq;
3751 ring->tx_pending = adapter->req_tx_entries_per_subcrq;
3752 ring->rx_mini_pending = 0;
3753 ring->rx_jumbo_pending = 0;
3754}
3755
3756static int ibmvnic_set_ringparam(struct net_device *netdev,
3757 struct ethtool_ringparam *ring,
3758 struct kernel_ethtool_ringparam *kernel_ring,
3759 struct netlink_ext_ack *extack)
3760{
3761 struct ibmvnic_adapter *adapter = netdev_priv(netdev);
3762
3763 if (ring->rx_pending > adapter->max_rx_add_entries_per_subcrq ||
3764 ring->tx_pending > adapter->max_tx_entries_per_subcrq) {
3765 netdev_err(netdev, "Invalid request.\n");
3766 netdev_err(netdev, "Max tx buffers = %llu\n",
3767 adapter->max_rx_add_entries_per_subcrq);
3768 netdev_err(netdev, "Max rx buffers = %llu\n",
3769 adapter->max_tx_entries_per_subcrq);
3770 return -EINVAL;
3771 }
3772
3773 adapter->desired.rx_entries = ring->rx_pending;
3774 adapter->desired.tx_entries = ring->tx_pending;
3775
3776 return wait_for_reset(adapter);
3777}
3778
3779static void ibmvnic_get_channels(struct net_device *netdev,
3780 struct ethtool_channels *channels)
3781{
3782 struct ibmvnic_adapter *adapter = netdev_priv(netdev);
3783
3784 channels->max_rx = adapter->max_rx_queues;
3785 channels->max_tx = adapter->max_tx_queues;
3786 channels->max_other = 0;
3787 channels->max_combined = 0;
3788 channels->rx_count = adapter->req_rx_queues;
3789 channels->tx_count = adapter->req_tx_queues;
3790 channels->other_count = 0;
3791 channels->combined_count = 0;
3792}
3793
3794static int ibmvnic_set_channels(struct net_device *netdev,
3795 struct ethtool_channels *channels)
3796{
3797 struct ibmvnic_adapter *adapter = netdev_priv(netdev);
3798
3799 adapter->desired.rx_queues = channels->rx_count;
3800 adapter->desired.tx_queues = channels->tx_count;
3801
3802 return wait_for_reset(adapter);
3803}
3804
3805static void ibmvnic_get_strings(struct net_device *dev, u32 stringset, u8 *data)
3806{
3807 struct ibmvnic_adapter *adapter = netdev_priv(dev);
3808 int i;
3809
3810 if (stringset != ETH_SS_STATS)
3811 return;
3812
3813 for (i = 0; i < ARRAY_SIZE(ibmvnic_stats); i++)
3814 ethtool_puts(&data, ibmvnic_stats[i].name);
3815
3816 for (i = 0; i < adapter->req_tx_queues; i++) {
3817 ethtool_sprintf(&data, "tx%d_batched_packets", i);
3818 ethtool_sprintf(&data, "tx%d_direct_packets", i);
3819 ethtool_sprintf(&data, "tx%d_bytes", i);
3820 ethtool_sprintf(&data, "tx%d_dropped_packets", i);
3821 }
3822
3823 for (i = 0; i < adapter->req_rx_queues; i++) {
3824 ethtool_sprintf(&data, "rx%d_packets", i);
3825 ethtool_sprintf(&data, "rx%d_bytes", i);
3826 ethtool_sprintf(&data, "rx%d_interrupts", i);
3827 }
3828}
3829
3830static int ibmvnic_get_sset_count(struct net_device *dev, int sset)
3831{
3832 struct ibmvnic_adapter *adapter = netdev_priv(dev);
3833
3834 switch (sset) {
3835 case ETH_SS_STATS:
3836 return ARRAY_SIZE(ibmvnic_stats) +
3837 adapter->req_tx_queues * NUM_TX_STATS +
3838 adapter->req_rx_queues * NUM_RX_STATS;
3839 default:
3840 return -EOPNOTSUPP;
3841 }
3842}
3843
3844static void ibmvnic_get_ethtool_stats(struct net_device *dev,
3845 struct ethtool_stats *stats, u64 *data)
3846{
3847 struct ibmvnic_adapter *adapter = netdev_priv(dev);
3848 union ibmvnic_crq crq;
3849 int i, j;
3850 int rc;
3851
3852 memset(&crq, 0, sizeof(crq));
3853 crq.request_statistics.first = IBMVNIC_CRQ_CMD;
3854 crq.request_statistics.cmd = REQUEST_STATISTICS;
3855 crq.request_statistics.ioba = cpu_to_be32(adapter->stats_token);
3856 crq.request_statistics.len =
3857 cpu_to_be32(sizeof(struct ibmvnic_statistics));
3858
3859 /* Wait for data to be written */
3860 reinit_completion(&adapter->stats_done);
3861 rc = ibmvnic_send_crq(adapter, &crq);
3862 if (rc)
3863 return;
3864 rc = ibmvnic_wait_for_completion(adapter, &adapter->stats_done, 10000);
3865 if (rc)
3866 return;
3867
3868 for (i = 0; i < ARRAY_SIZE(ibmvnic_stats); i++)
3869 data[i] = be64_to_cpu(IBMVNIC_GET_STAT
3870 (adapter, ibmvnic_stats[i].offset));
3871
3872 for (j = 0; j < adapter->req_tx_queues; j++) {
3873 data[i] = adapter->tx_stats_buffers[j].batched_packets;
3874 i++;
3875 data[i] = adapter->tx_stats_buffers[j].direct_packets;
3876 i++;
3877 data[i] = adapter->tx_stats_buffers[j].bytes;
3878 i++;
3879 data[i] = adapter->tx_stats_buffers[j].dropped_packets;
3880 i++;
3881 }
3882
3883 for (j = 0; j < adapter->req_rx_queues; j++) {
3884 data[i] = adapter->rx_stats_buffers[j].packets;
3885 i++;
3886 data[i] = adapter->rx_stats_buffers[j].bytes;
3887 i++;
3888 data[i] = adapter->rx_stats_buffers[j].interrupts;
3889 i++;
3890 }
3891}
3892
3893static const struct ethtool_ops ibmvnic_ethtool_ops = {
3894 .get_drvinfo = ibmvnic_get_drvinfo,
3895 .get_msglevel = ibmvnic_get_msglevel,
3896 .set_msglevel = ibmvnic_set_msglevel,
3897 .get_link = ibmvnic_get_link,
3898 .get_ringparam = ibmvnic_get_ringparam,
3899 .set_ringparam = ibmvnic_set_ringparam,
3900 .get_channels = ibmvnic_get_channels,
3901 .set_channels = ibmvnic_set_channels,
3902 .get_strings = ibmvnic_get_strings,
3903 .get_sset_count = ibmvnic_get_sset_count,
3904 .get_ethtool_stats = ibmvnic_get_ethtool_stats,
3905 .get_link_ksettings = ibmvnic_get_link_ksettings,
3906};
3907
3908/* Routines for managing CRQs/sCRQs */
3909
3910static int reset_one_sub_crq_queue(struct ibmvnic_adapter *adapter,
3911 struct ibmvnic_sub_crq_queue *scrq)
3912{
3913 int rc;
3914
3915 if (!scrq) {
3916 netdev_dbg(adapter->netdev, "Invalid scrq reset.\n");
3917 return -EINVAL;
3918 }
3919
3920 if (scrq->irq) {
3921 free_irq(scrq->irq, scrq);
3922 irq_dispose_mapping(scrq->irq);
3923 scrq->irq = 0;
3924 }
3925
3926 if (scrq->msgs) {
3927 memset(scrq->msgs, 0, 4 * PAGE_SIZE);
3928 atomic_set(&scrq->used, 0);
3929 scrq->cur = 0;
3930 scrq->ind_buf.index = 0;
3931 } else {
3932 netdev_dbg(adapter->netdev, "Invalid scrq reset\n");
3933 return -EINVAL;
3934 }
3935
3936 rc = h_reg_sub_crq(adapter->vdev->unit_address, scrq->msg_token,
3937 4 * PAGE_SIZE, &scrq->crq_num, &scrq->hw_irq);
3938 return rc;
3939}
3940
3941static int reset_sub_crq_queues(struct ibmvnic_adapter *adapter)
3942{
3943 int i, rc;
3944
3945 if (!adapter->tx_scrq || !adapter->rx_scrq)
3946 return -EINVAL;
3947
3948 ibmvnic_clean_affinity(adapter);
3949
3950 for (i = 0; i < adapter->req_tx_queues; i++) {
3951 netdev_dbg(adapter->netdev, "Re-setting tx_scrq[%d]\n", i);
3952 rc = reset_one_sub_crq_queue(adapter, adapter->tx_scrq[i]);
3953 if (rc)
3954 return rc;
3955 }
3956
3957 for (i = 0; i < adapter->req_rx_queues; i++) {
3958 netdev_dbg(adapter->netdev, "Re-setting rx_scrq[%d]\n", i);
3959 rc = reset_one_sub_crq_queue(adapter, adapter->rx_scrq[i]);
3960 if (rc)
3961 return rc;
3962 }
3963
3964 return rc;
3965}
3966
3967static void release_sub_crq_queue(struct ibmvnic_adapter *adapter,
3968 struct ibmvnic_sub_crq_queue *scrq,
3969 bool do_h_free)
3970{
3971 struct device *dev = &adapter->vdev->dev;
3972 long rc;
3973
3974 netdev_dbg(adapter->netdev, "Releasing sub-CRQ\n");
3975
3976 if (do_h_free) {
3977 /* Close the sub-crqs */
3978 do {
3979 rc = plpar_hcall_norets(H_FREE_SUB_CRQ,
3980 adapter->vdev->unit_address,
3981 scrq->crq_num);
3982 } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
3983
3984 if (rc) {
3985 netdev_err(adapter->netdev,
3986 "Failed to release sub-CRQ %16lx, rc = %ld\n",
3987 scrq->crq_num, rc);
3988 }
3989 }
3990
3991 dma_free_coherent(dev,
3992 IBMVNIC_IND_ARR_SZ,
3993 scrq->ind_buf.indir_arr,
3994 scrq->ind_buf.indir_dma);
3995
3996 dma_unmap_single(dev, scrq->msg_token, 4 * PAGE_SIZE,
3997 DMA_BIDIRECTIONAL);
3998 free_pages((unsigned long)scrq->msgs, 2);
3999 free_cpumask_var(scrq->affinity_mask);
4000 kfree(scrq);
4001}
4002
4003static struct ibmvnic_sub_crq_queue *init_sub_crq_queue(struct ibmvnic_adapter
4004 *adapter)
4005{
4006 struct device *dev = &adapter->vdev->dev;
4007 struct ibmvnic_sub_crq_queue *scrq;
4008 int rc;
4009
4010 scrq = kzalloc(sizeof(*scrq), GFP_KERNEL);
4011 if (!scrq)
4012 return NULL;
4013
4014 scrq->msgs =
4015 (union sub_crq *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, 2);
4016 if (!scrq->msgs) {
4017 dev_warn(dev, "Couldn't allocate crq queue messages page\n");
4018 goto zero_page_failed;
4019 }
4020 if (!zalloc_cpumask_var(&scrq->affinity_mask, GFP_KERNEL))
4021 goto cpumask_alloc_failed;
4022
4023 scrq->msg_token = dma_map_single(dev, scrq->msgs, 4 * PAGE_SIZE,
4024 DMA_BIDIRECTIONAL);
4025 if (dma_mapping_error(dev, scrq->msg_token)) {
4026 dev_warn(dev, "Couldn't map crq queue messages page\n");
4027 goto map_failed;
4028 }
4029
4030 rc = h_reg_sub_crq(adapter->vdev->unit_address, scrq->msg_token,
4031 4 * PAGE_SIZE, &scrq->crq_num, &scrq->hw_irq);
4032
4033 if (rc == H_RESOURCE)
4034 rc = ibmvnic_reset_crq(adapter);
4035
4036 if (rc == H_CLOSED) {
4037 dev_warn(dev, "Partner adapter not ready, waiting.\n");
4038 } else if (rc) {
4039 dev_warn(dev, "Error %d registering sub-crq\n", rc);
4040 goto reg_failed;
4041 }
4042
4043 scrq->adapter = adapter;
4044 scrq->size = 4 * PAGE_SIZE / sizeof(*scrq->msgs);
4045 scrq->ind_buf.index = 0;
4046
4047 scrq->ind_buf.indir_arr =
4048 dma_alloc_coherent(dev,
4049 IBMVNIC_IND_ARR_SZ,
4050 &scrq->ind_buf.indir_dma,
4051 GFP_KERNEL);
4052
4053 if (!scrq->ind_buf.indir_arr)
4054 goto indir_failed;
4055
4056 spin_lock_init(&scrq->lock);
4057
4058 netdev_dbg(adapter->netdev,
4059 "sub-crq initialized, num %lx, hw_irq=%lx, irq=%x\n",
4060 scrq->crq_num, scrq->hw_irq, scrq->irq);
4061
4062 return scrq;
4063
4064indir_failed:
4065 do {
4066 rc = plpar_hcall_norets(H_FREE_SUB_CRQ,
4067 adapter->vdev->unit_address,
4068 scrq->crq_num);
4069 } while (rc == H_BUSY || rc == H_IS_LONG_BUSY(rc));
4070reg_failed:
4071 dma_unmap_single(dev, scrq->msg_token, 4 * PAGE_SIZE,
4072 DMA_BIDIRECTIONAL);
4073map_failed:
4074 free_cpumask_var(scrq->affinity_mask);
4075cpumask_alloc_failed:
4076 free_pages((unsigned long)scrq->msgs, 2);
4077zero_page_failed:
4078 kfree(scrq);
4079
4080 return NULL;
4081}
4082
4083static void release_sub_crqs(struct ibmvnic_adapter *adapter, bool do_h_free)
4084{
4085 int i;
4086
4087 ibmvnic_clean_affinity(adapter);
4088 if (adapter->tx_scrq) {
4089 for (i = 0; i < adapter->num_active_tx_scrqs; i++) {
4090 if (!adapter->tx_scrq[i])
4091 continue;
4092
4093 netdev_dbg(adapter->netdev, "Releasing tx_scrq[%d]\n",
4094 i);
4095 ibmvnic_tx_scrq_clean_buffer(adapter, adapter->tx_scrq[i]);
4096 if (adapter->tx_scrq[i]->irq) {
4097 free_irq(adapter->tx_scrq[i]->irq,
4098 adapter->tx_scrq[i]);
4099 irq_dispose_mapping(adapter->tx_scrq[i]->irq);
4100 adapter->tx_scrq[i]->irq = 0;
4101 }
4102
4103 release_sub_crq_queue(adapter, adapter->tx_scrq[i],
4104 do_h_free);
4105 }
4106
4107 kfree(adapter->tx_scrq);
4108 adapter->tx_scrq = NULL;
4109 adapter->num_active_tx_scrqs = 0;
4110 }
4111
4112 /* Clean any remaining outstanding SKBs
4113 * we freed the irq so we won't be hearing
4114 * from them
4115 */
4116 clean_tx_pools(adapter);
4117
4118 if (adapter->rx_scrq) {
4119 for (i = 0; i < adapter->num_active_rx_scrqs; i++) {
4120 if (!adapter->rx_scrq[i])
4121 continue;
4122
4123 netdev_dbg(adapter->netdev, "Releasing rx_scrq[%d]\n",
4124 i);
4125 if (adapter->rx_scrq[i]->irq) {
4126 free_irq(adapter->rx_scrq[i]->irq,
4127 adapter->rx_scrq[i]);
4128 irq_dispose_mapping(adapter->rx_scrq[i]->irq);
4129 adapter->rx_scrq[i]->irq = 0;
4130 }
4131
4132 release_sub_crq_queue(adapter, adapter->rx_scrq[i],
4133 do_h_free);
4134 }
4135
4136 kfree(adapter->rx_scrq);
4137 adapter->rx_scrq = NULL;
4138 adapter->num_active_rx_scrqs = 0;
4139 }
4140}
4141
4142static int disable_scrq_irq(struct ibmvnic_adapter *adapter,
4143 struct ibmvnic_sub_crq_queue *scrq)
4144{
4145 struct device *dev = &adapter->vdev->dev;
4146 unsigned long rc;
4147
4148 rc = plpar_hcall_norets(H_VIOCTL, adapter->vdev->unit_address,
4149 H_DISABLE_VIO_INTERRUPT, scrq->hw_irq, 0, 0);
4150 if (rc)
4151 dev_err(dev, "Couldn't disable scrq irq 0x%lx. rc=%ld\n",
4152 scrq->hw_irq, rc);
4153 return rc;
4154}
4155
4156/* We can not use the IRQ chip EOI handler because that has the
4157 * unintended effect of changing the interrupt priority.
4158 */
4159static void ibmvnic_xics_eoi(struct device *dev, struct ibmvnic_sub_crq_queue *scrq)
4160{
4161 u64 val = 0xff000000 | scrq->hw_irq;
4162 unsigned long rc;
4163
4164 rc = plpar_hcall_norets(H_EOI, val);
4165 if (rc)
4166 dev_err(dev, "H_EOI FAILED irq 0x%llx. rc=%ld\n", val, rc);
4167}
4168
4169/* Due to a firmware bug, the hypervisor can send an interrupt to a
4170 * transmit or receive queue just prior to a partition migration.
4171 * Force an EOI after migration.
4172 */
4173static void ibmvnic_clear_pending_interrupt(struct device *dev,
4174 struct ibmvnic_sub_crq_queue *scrq)
4175{
4176 if (!xive_enabled())
4177 ibmvnic_xics_eoi(dev, scrq);
4178}
4179
4180static int enable_scrq_irq(struct ibmvnic_adapter *adapter,
4181 struct ibmvnic_sub_crq_queue *scrq)
4182{
4183 struct device *dev = &adapter->vdev->dev;
4184 unsigned long rc;
4185
4186 if (scrq->hw_irq > 0x100000000ULL) {
4187 dev_err(dev, "bad hw_irq = %lx\n", scrq->hw_irq);
4188 return 1;
4189 }
4190
4191 if (test_bit(0, &adapter->resetting) &&
4192 adapter->reset_reason == VNIC_RESET_MOBILITY) {
4193 ibmvnic_clear_pending_interrupt(dev, scrq);
4194 }
4195
4196 rc = plpar_hcall_norets(H_VIOCTL, adapter->vdev->unit_address,
4197 H_ENABLE_VIO_INTERRUPT, scrq->hw_irq, 0, 0);
4198 if (rc)
4199 dev_err(dev, "Couldn't enable scrq irq 0x%lx. rc=%ld\n",
4200 scrq->hw_irq, rc);
4201 return rc;
4202}
4203
4204static int ibmvnic_complete_tx(struct ibmvnic_adapter *adapter,
4205 struct ibmvnic_sub_crq_queue *scrq)
4206{
4207 struct device *dev = &adapter->vdev->dev;
4208 int num_packets = 0, total_bytes = 0;
4209 struct ibmvnic_tx_pool *tx_pool;
4210 struct ibmvnic_tx_buff *txbuff;
4211 struct netdev_queue *txq;
4212 union sub_crq *next;
4213 int index, i;
4214
4215restart_loop:
4216 while (pending_scrq(adapter, scrq)) {
4217 unsigned int pool = scrq->pool_index;
4218 int num_entries = 0;
4219 next = ibmvnic_next_scrq(adapter, scrq);
4220 for (i = 0; i < next->tx_comp.num_comps; i++) {
4221 index = be32_to_cpu(next->tx_comp.correlators[i]);
4222 if (index & IBMVNIC_TSO_POOL_MASK) {
4223 tx_pool = &adapter->tso_pool[pool];
4224 index &= ~IBMVNIC_TSO_POOL_MASK;
4225 } else {
4226 tx_pool = &adapter->tx_pool[pool];
4227 }
4228
4229 txbuff = &tx_pool->tx_buff[index];
4230 num_packets++;
4231 num_entries += txbuff->num_entries;
4232 if (txbuff->skb) {
4233 total_bytes += txbuff->skb->len;
4234 if (next->tx_comp.rcs[i]) {
4235 dev_err(dev, "tx error %x\n",
4236 next->tx_comp.rcs[i]);
4237 dev_kfree_skb_irq(txbuff->skb);
4238 } else {
4239 dev_consume_skb_irq(txbuff->skb);
4240 }
4241 txbuff->skb = NULL;
4242 } else {
4243 netdev_warn(adapter->netdev,
4244 "TX completion received with NULL socket buffer\n");
4245 }
4246 tx_pool->free_map[tx_pool->producer_index] = index;
4247 tx_pool->producer_index =
4248 (tx_pool->producer_index + 1) %
4249 tx_pool->num_buffers;
4250 }
4251 /* remove tx_comp scrq*/
4252 next->tx_comp.first = 0;
4253
4254
4255 if (atomic_sub_return(num_entries, &scrq->used) <=
4256 (adapter->req_tx_entries_per_subcrq / 2) &&
4257 __netif_subqueue_stopped(adapter->netdev,
4258 scrq->pool_index)) {
4259 rcu_read_lock();
4260 if (adapter->tx_queues_active) {
4261 netif_wake_subqueue(adapter->netdev,
4262 scrq->pool_index);
4263 netdev_dbg(adapter->netdev,
4264 "Started queue %d\n",
4265 scrq->pool_index);
4266 }
4267 rcu_read_unlock();
4268 }
4269 }
4270
4271 enable_scrq_irq(adapter, scrq);
4272
4273 if (pending_scrq(adapter, scrq)) {
4274 disable_scrq_irq(adapter, scrq);
4275 goto restart_loop;
4276 }
4277
4278 txq = netdev_get_tx_queue(adapter->netdev, scrq->pool_index);
4279 netdev_tx_completed_queue(txq, num_packets, total_bytes);
4280
4281 return 0;
4282}
4283
4284static irqreturn_t ibmvnic_interrupt_tx(int irq, void *instance)
4285{
4286 struct ibmvnic_sub_crq_queue *scrq = instance;
4287 struct ibmvnic_adapter *adapter = scrq->adapter;
4288
4289 disable_scrq_irq(adapter, scrq);
4290 ibmvnic_complete_tx(adapter, scrq);
4291
4292 return IRQ_HANDLED;
4293}
4294
4295static irqreturn_t ibmvnic_interrupt_rx(int irq, void *instance)
4296{
4297 struct ibmvnic_sub_crq_queue *scrq = instance;
4298 struct ibmvnic_adapter *adapter = scrq->adapter;
4299
4300 /* When booting a kdump kernel we can hit pending interrupts
4301 * prior to completing driver initialization.
4302 */
4303 if (unlikely(adapter->state != VNIC_OPEN))
4304 return IRQ_NONE;
4305
4306 adapter->rx_stats_buffers[scrq->scrq_num].interrupts++;
4307
4308 if (napi_schedule_prep(&adapter->napi[scrq->scrq_num])) {
4309 disable_scrq_irq(adapter, scrq);
4310 __napi_schedule(&adapter->napi[scrq->scrq_num]);
4311 }
4312
4313 return IRQ_HANDLED;
4314}
4315
4316static int init_sub_crq_irqs(struct ibmvnic_adapter *adapter)
4317{
4318 struct device *dev = &adapter->vdev->dev;
4319 struct ibmvnic_sub_crq_queue *scrq;
4320 int i = 0, j = 0;
4321 int rc = 0;
4322
4323 for (i = 0; i < adapter->req_tx_queues; i++) {
4324 netdev_dbg(adapter->netdev, "Initializing tx_scrq[%d] irq\n",
4325 i);
4326 scrq = adapter->tx_scrq[i];
4327 scrq->irq = irq_create_mapping(NULL, scrq->hw_irq);
4328
4329 if (!scrq->irq) {
4330 rc = -EINVAL;
4331 dev_err(dev, "Error mapping irq\n");
4332 goto req_tx_irq_failed;
4333 }
4334
4335 snprintf(scrq->name, sizeof(scrq->name), "ibmvnic-%x-tx%d",
4336 adapter->vdev->unit_address, i);
4337 rc = request_irq(scrq->irq, ibmvnic_interrupt_tx,
4338 0, scrq->name, scrq);
4339
4340 if (rc) {
4341 dev_err(dev, "Couldn't register tx irq 0x%x. rc=%d\n",
4342 scrq->irq, rc);
4343 irq_dispose_mapping(scrq->irq);
4344 goto req_tx_irq_failed;
4345 }
4346 }
4347
4348 for (i = 0; i < adapter->req_rx_queues; i++) {
4349 netdev_dbg(adapter->netdev, "Initializing rx_scrq[%d] irq\n",
4350 i);
4351 scrq = adapter->rx_scrq[i];
4352 scrq->irq = irq_create_mapping(NULL, scrq->hw_irq);
4353 if (!scrq->irq) {
4354 rc = -EINVAL;
4355 dev_err(dev, "Error mapping irq\n");
4356 goto req_rx_irq_failed;
4357 }
4358 snprintf(scrq->name, sizeof(scrq->name), "ibmvnic-%x-rx%d",
4359 adapter->vdev->unit_address, i);
4360 rc = request_irq(scrq->irq, ibmvnic_interrupt_rx,
4361 0, scrq->name, scrq);
4362 if (rc) {
4363 dev_err(dev, "Couldn't register rx irq 0x%x. rc=%d\n",
4364 scrq->irq, rc);
4365 irq_dispose_mapping(scrq->irq);
4366 goto req_rx_irq_failed;
4367 }
4368 }
4369
4370 cpus_read_lock();
4371 ibmvnic_set_affinity(adapter);
4372 cpus_read_unlock();
4373
4374 return rc;
4375
4376req_rx_irq_failed:
4377 for (j = 0; j < i; j++) {
4378 free_irq(adapter->rx_scrq[j]->irq, adapter->rx_scrq[j]);
4379 irq_dispose_mapping(adapter->rx_scrq[j]->irq);
4380 }
4381 i = adapter->req_tx_queues;
4382req_tx_irq_failed:
4383 for (j = 0; j < i; j++) {
4384 free_irq(adapter->tx_scrq[j]->irq, adapter->tx_scrq[j]);
4385 irq_dispose_mapping(adapter->tx_scrq[j]->irq);
4386 }
4387 release_sub_crqs(adapter, 1);
4388 return rc;
4389}
4390
4391static int init_sub_crqs(struct ibmvnic_adapter *adapter)
4392{
4393 struct device *dev = &adapter->vdev->dev;
4394 struct ibmvnic_sub_crq_queue **allqueues;
4395 int registered_queues = 0;
4396 int total_queues;
4397 int more = 0;
4398 int i;
4399
4400 total_queues = adapter->req_tx_queues + adapter->req_rx_queues;
4401
4402 allqueues = kcalloc(total_queues, sizeof(*allqueues), GFP_KERNEL);
4403 if (!allqueues)
4404 return -ENOMEM;
4405
4406 for (i = 0; i < total_queues; i++) {
4407 allqueues[i] = init_sub_crq_queue(adapter);
4408 if (!allqueues[i]) {
4409 dev_warn(dev, "Couldn't allocate all sub-crqs\n");
4410 break;
4411 }
4412 registered_queues++;
4413 }
4414
4415 /* Make sure we were able to register the minimum number of queues */
4416 if (registered_queues <
4417 adapter->min_tx_queues + adapter->min_rx_queues) {
4418 dev_err(dev, "Fatal: Couldn't init min number of sub-crqs\n");
4419 goto tx_failed;
4420 }
4421
4422 /* Distribute the failed allocated queues*/
4423 for (i = 0; i < total_queues - registered_queues + more ; i++) {
4424 netdev_dbg(adapter->netdev, "Reducing number of queues\n");
4425 switch (i % 3) {
4426 case 0:
4427 if (adapter->req_rx_queues > adapter->min_rx_queues)
4428 adapter->req_rx_queues--;
4429 else
4430 more++;
4431 break;
4432 case 1:
4433 if (adapter->req_tx_queues > adapter->min_tx_queues)
4434 adapter->req_tx_queues--;
4435 else
4436 more++;
4437 break;
4438 }
4439 }
4440
4441 adapter->tx_scrq = kcalloc(adapter->req_tx_queues,
4442 sizeof(*adapter->tx_scrq), GFP_KERNEL);
4443 if (!adapter->tx_scrq)
4444 goto tx_failed;
4445
4446 for (i = 0; i < adapter->req_tx_queues; i++) {
4447 adapter->tx_scrq[i] = allqueues[i];
4448 adapter->tx_scrq[i]->pool_index = i;
4449 adapter->num_active_tx_scrqs++;
4450 }
4451
4452 adapter->rx_scrq = kcalloc(adapter->req_rx_queues,
4453 sizeof(*adapter->rx_scrq), GFP_KERNEL);
4454 if (!adapter->rx_scrq)
4455 goto rx_failed;
4456
4457 for (i = 0; i < adapter->req_rx_queues; i++) {
4458 adapter->rx_scrq[i] = allqueues[i + adapter->req_tx_queues];
4459 adapter->rx_scrq[i]->scrq_num = i;
4460 adapter->num_active_rx_scrqs++;
4461 }
4462
4463 kfree(allqueues);
4464 return 0;
4465
4466rx_failed:
4467 kfree(adapter->tx_scrq);
4468 adapter->tx_scrq = NULL;
4469tx_failed:
4470 for (i = 0; i < registered_queues; i++)
4471 release_sub_crq_queue(adapter, allqueues[i], 1);
4472 kfree(allqueues);
4473 return -ENOMEM;
4474}
4475
4476static void send_request_cap(struct ibmvnic_adapter *adapter, int retry)
4477{
4478 struct device *dev = &adapter->vdev->dev;
4479 union ibmvnic_crq crq;
4480 int max_entries;
4481 int cap_reqs;
4482
4483 /* We send out 6 or 7 REQUEST_CAPABILITY CRQs below (depending on
4484 * the PROMISC flag). Initialize this count upfront. When the tasklet
4485 * receives a response to all of these, it will send the next protocol
4486 * message (QUERY_IP_OFFLOAD).
4487 */
4488 if (!(adapter->netdev->flags & IFF_PROMISC) ||
4489 adapter->promisc_supported)
4490 cap_reqs = 7;
4491 else
4492 cap_reqs = 6;
4493
4494 if (!retry) {
4495 /* Sub-CRQ entries are 32 byte long */
4496 int entries_page = 4 * PAGE_SIZE / (sizeof(u64) * 4);
4497
4498 atomic_set(&adapter->running_cap_crqs, cap_reqs);
4499
4500 if (adapter->min_tx_entries_per_subcrq > entries_page ||
4501 adapter->min_rx_add_entries_per_subcrq > entries_page) {
4502 dev_err(dev, "Fatal, invalid entries per sub-crq\n");
4503 return;
4504 }
4505
4506 if (adapter->desired.mtu)
4507 adapter->req_mtu = adapter->desired.mtu;
4508 else
4509 adapter->req_mtu = adapter->netdev->mtu + ETH_HLEN;
4510
4511 if (!adapter->desired.tx_entries)
4512 adapter->desired.tx_entries =
4513 adapter->max_tx_entries_per_subcrq;
4514 if (!adapter->desired.rx_entries)
4515 adapter->desired.rx_entries =
4516 adapter->max_rx_add_entries_per_subcrq;
4517
4518 max_entries = IBMVNIC_LTB_SET_SIZE /
4519 (adapter->req_mtu + IBMVNIC_BUFFER_HLEN);
4520
4521 if ((adapter->req_mtu + IBMVNIC_BUFFER_HLEN) *
4522 adapter->desired.tx_entries > IBMVNIC_LTB_SET_SIZE) {
4523 adapter->desired.tx_entries = max_entries;
4524 }
4525
4526 if ((adapter->req_mtu + IBMVNIC_BUFFER_HLEN) *
4527 adapter->desired.rx_entries > IBMVNIC_LTB_SET_SIZE) {
4528 adapter->desired.rx_entries = max_entries;
4529 }
4530
4531 if (adapter->desired.tx_entries)
4532 adapter->req_tx_entries_per_subcrq =
4533 adapter->desired.tx_entries;
4534 else
4535 adapter->req_tx_entries_per_subcrq =
4536 adapter->max_tx_entries_per_subcrq;
4537
4538 if (adapter->desired.rx_entries)
4539 adapter->req_rx_add_entries_per_subcrq =
4540 adapter->desired.rx_entries;
4541 else
4542 adapter->req_rx_add_entries_per_subcrq =
4543 adapter->max_rx_add_entries_per_subcrq;
4544
4545 if (adapter->desired.tx_queues)
4546 adapter->req_tx_queues =
4547 adapter->desired.tx_queues;
4548 else
4549 adapter->req_tx_queues =
4550 adapter->opt_tx_comp_sub_queues;
4551
4552 if (adapter->desired.rx_queues)
4553 adapter->req_rx_queues =
4554 adapter->desired.rx_queues;
4555 else
4556 adapter->req_rx_queues =
4557 adapter->opt_rx_comp_queues;
4558
4559 adapter->req_rx_add_queues = adapter->max_rx_add_queues;
4560 } else {
4561 atomic_add(cap_reqs, &adapter->running_cap_crqs);
4562 }
4563 memset(&crq, 0, sizeof(crq));
4564 crq.request_capability.first = IBMVNIC_CRQ_CMD;
4565 crq.request_capability.cmd = REQUEST_CAPABILITY;
4566
4567 crq.request_capability.capability = cpu_to_be16(REQ_TX_QUEUES);
4568 crq.request_capability.number = cpu_to_be64(adapter->req_tx_queues);
4569 cap_reqs--;
4570 ibmvnic_send_crq(adapter, &crq);
4571
4572 crq.request_capability.capability = cpu_to_be16(REQ_RX_QUEUES);
4573 crq.request_capability.number = cpu_to_be64(adapter->req_rx_queues);
4574 cap_reqs--;
4575 ibmvnic_send_crq(adapter, &crq);
4576
4577 crq.request_capability.capability = cpu_to_be16(REQ_RX_ADD_QUEUES);
4578 crq.request_capability.number = cpu_to_be64(adapter->req_rx_add_queues);
4579 cap_reqs--;
4580 ibmvnic_send_crq(adapter, &crq);
4581
4582 crq.request_capability.capability =
4583 cpu_to_be16(REQ_TX_ENTRIES_PER_SUBCRQ);
4584 crq.request_capability.number =
4585 cpu_to_be64(adapter->req_tx_entries_per_subcrq);
4586 cap_reqs--;
4587 ibmvnic_send_crq(adapter, &crq);
4588
4589 crq.request_capability.capability =
4590 cpu_to_be16(REQ_RX_ADD_ENTRIES_PER_SUBCRQ);
4591 crq.request_capability.number =
4592 cpu_to_be64(adapter->req_rx_add_entries_per_subcrq);
4593 cap_reqs--;
4594 ibmvnic_send_crq(adapter, &crq);
4595
4596 crq.request_capability.capability = cpu_to_be16(REQ_MTU);
4597 crq.request_capability.number = cpu_to_be64(adapter->req_mtu);
4598 cap_reqs--;
4599 ibmvnic_send_crq(adapter, &crq);
4600
4601 if (adapter->netdev->flags & IFF_PROMISC) {
4602 if (adapter->promisc_supported) {
4603 crq.request_capability.capability =
4604 cpu_to_be16(PROMISC_REQUESTED);
4605 crq.request_capability.number = cpu_to_be64(1);
4606 cap_reqs--;
4607 ibmvnic_send_crq(adapter, &crq);
4608 }
4609 } else {
4610 crq.request_capability.capability =
4611 cpu_to_be16(PROMISC_REQUESTED);
4612 crq.request_capability.number = cpu_to_be64(0);
4613 cap_reqs--;
4614 ibmvnic_send_crq(adapter, &crq);
4615 }
4616
4617 /* Keep at end to catch any discrepancy between expected and actual
4618 * CRQs sent.
4619 */
4620 WARN_ON(cap_reqs != 0);
4621}
4622
4623static int pending_scrq(struct ibmvnic_adapter *adapter,
4624 struct ibmvnic_sub_crq_queue *scrq)
4625{
4626 union sub_crq *entry = &scrq->msgs[scrq->cur];
4627 int rc;
4628
4629 rc = !!(entry->generic.first & IBMVNIC_CRQ_CMD_RSP);
4630
4631 /* Ensure that the SCRQ valid flag is loaded prior to loading the
4632 * contents of the SCRQ descriptor
4633 */
4634 dma_rmb();
4635
4636 return rc;
4637}
4638
4639static union sub_crq *ibmvnic_next_scrq(struct ibmvnic_adapter *adapter,
4640 struct ibmvnic_sub_crq_queue *scrq)
4641{
4642 union sub_crq *entry;
4643 unsigned long flags;
4644
4645 spin_lock_irqsave(&scrq->lock, flags);
4646 entry = &scrq->msgs[scrq->cur];
4647 if (entry->generic.first & IBMVNIC_CRQ_CMD_RSP) {
4648 if (++scrq->cur == scrq->size)
4649 scrq->cur = 0;
4650 } else {
4651 entry = NULL;
4652 }
4653 spin_unlock_irqrestore(&scrq->lock, flags);
4654
4655 /* Ensure that the SCRQ valid flag is loaded prior to loading the
4656 * contents of the SCRQ descriptor
4657 */
4658 dma_rmb();
4659
4660 return entry;
4661}
4662
4663static union ibmvnic_crq *ibmvnic_next_crq(struct ibmvnic_adapter *adapter)
4664{
4665 struct ibmvnic_crq_queue *queue = &adapter->crq;
4666 union ibmvnic_crq *crq;
4667
4668 crq = &queue->msgs[queue->cur];
4669 if (crq->generic.first & IBMVNIC_CRQ_CMD_RSP) {
4670 if (++queue->cur == queue->size)
4671 queue->cur = 0;
4672 } else {
4673 crq = NULL;
4674 }
4675
4676 return crq;
4677}
4678
4679static void print_subcrq_error(struct device *dev, int rc, const char *func)
4680{
4681 switch (rc) {
4682 case H_PARAMETER:
4683 dev_warn_ratelimited(dev,
4684 "%s failed: Send request is malformed or adapter failover pending. (rc=%d)\n",
4685 func, rc);
4686 break;
4687 case H_CLOSED:
4688 dev_warn_ratelimited(dev,
4689 "%s failed: Backing queue closed. Adapter is down or failover pending. (rc=%d)\n",
4690 func, rc);
4691 break;
4692 default:
4693 dev_err_ratelimited(dev, "%s failed: (rc=%d)\n", func, rc);
4694 break;
4695 }
4696}
4697
4698static int send_subcrq_indirect(struct ibmvnic_adapter *adapter,
4699 u64 remote_handle, u64 ioba, u64 num_entries)
4700{
4701 unsigned int ua = adapter->vdev->unit_address;
4702 struct device *dev = &adapter->vdev->dev;
4703 int rc;
4704
4705 /* Make sure the hypervisor sees the complete request */
4706 dma_wmb();
4707 rc = plpar_hcall_norets(H_SEND_SUB_CRQ_INDIRECT, ua,
4708 cpu_to_be64(remote_handle),
4709 ioba, num_entries);
4710
4711 if (rc)
4712 print_subcrq_error(dev, rc, __func__);
4713
4714 return rc;
4715}
4716
4717static int ibmvnic_send_crq(struct ibmvnic_adapter *adapter,
4718 union ibmvnic_crq *crq)
4719{
4720 unsigned int ua = adapter->vdev->unit_address;
4721 struct device *dev = &adapter->vdev->dev;
4722 u64 *u64_crq = (u64 *)crq;
4723 int rc;
4724
4725 netdev_dbg(adapter->netdev, "Sending CRQ: %016lx %016lx\n",
4726 (unsigned long)cpu_to_be64(u64_crq[0]),
4727 (unsigned long)cpu_to_be64(u64_crq[1]));
4728
4729 if (!adapter->crq.active &&
4730 crq->generic.first != IBMVNIC_CRQ_INIT_CMD) {
4731 dev_warn(dev, "Invalid request detected while CRQ is inactive, possible device state change during reset\n");
4732 return -EINVAL;
4733 }
4734
4735 /* Make sure the hypervisor sees the complete request */
4736 dma_wmb();
4737
4738 rc = plpar_hcall_norets(H_SEND_CRQ, ua,
4739 cpu_to_be64(u64_crq[0]),
4740 cpu_to_be64(u64_crq[1]));
4741
4742 if (rc) {
4743 if (rc == H_CLOSED) {
4744 dev_warn(dev, "CRQ Queue closed\n");
4745 /* do not reset, report the fail, wait for passive init from server */
4746 }
4747
4748 dev_warn(dev, "Send error (rc=%d)\n", rc);
4749 }
4750
4751 return rc;
4752}
4753
4754static int ibmvnic_send_crq_init(struct ibmvnic_adapter *adapter)
4755{
4756 struct device *dev = &adapter->vdev->dev;
4757 union ibmvnic_crq crq;
4758 int retries = 100;
4759 int rc;
4760
4761 memset(&crq, 0, sizeof(crq));
4762 crq.generic.first = IBMVNIC_CRQ_INIT_CMD;
4763 crq.generic.cmd = IBMVNIC_CRQ_INIT;
4764 netdev_dbg(adapter->netdev, "Sending CRQ init\n");
4765
4766 do {
4767 rc = ibmvnic_send_crq(adapter, &crq);
4768 if (rc != H_CLOSED)
4769 break;
4770 retries--;
4771 msleep(50);
4772
4773 } while (retries > 0);
4774
4775 if (rc) {
4776 dev_err(dev, "Failed to send init request, rc = %d\n", rc);
4777 return rc;
4778 }
4779
4780 return 0;
4781}
4782
4783struct vnic_login_client_data {
4784 u8 type;
4785 __be16 len;
4786 char name[];
4787} __packed;
4788
4789static int vnic_client_data_len(struct ibmvnic_adapter *adapter)
4790{
4791 int len;
4792
4793 /* Calculate the amount of buffer space needed for the
4794 * vnic client data in the login buffer. There are four entries,
4795 * OS name, LPAR name, device name, and a null last entry.
4796 */
4797 len = 4 * sizeof(struct vnic_login_client_data);
4798 len += 6; /* "Linux" plus NULL */
4799 len += strlen(utsname()->nodename) + 1;
4800 len += strlen(adapter->netdev->name) + 1;
4801
4802 return len;
4803}
4804
4805static void vnic_add_client_data(struct ibmvnic_adapter *adapter,
4806 struct vnic_login_client_data *vlcd)
4807{
4808 const char *os_name = "Linux";
4809 int len;
4810
4811 /* Type 1 - LPAR OS */
4812 vlcd->type = 1;
4813 len = strlen(os_name) + 1;
4814 vlcd->len = cpu_to_be16(len);
4815 strscpy(vlcd->name, os_name, len);
4816 vlcd = (struct vnic_login_client_data *)(vlcd->name + len);
4817
4818 /* Type 2 - LPAR name */
4819 vlcd->type = 2;
4820 len = strlen(utsname()->nodename) + 1;
4821 vlcd->len = cpu_to_be16(len);
4822 strscpy(vlcd->name, utsname()->nodename, len);
4823 vlcd = (struct vnic_login_client_data *)(vlcd->name + len);
4824
4825 /* Type 3 - device name */
4826 vlcd->type = 3;
4827 len = strlen(adapter->netdev->name) + 1;
4828 vlcd->len = cpu_to_be16(len);
4829 strscpy(vlcd->name, adapter->netdev->name, len);
4830}
4831
4832static int send_login(struct ibmvnic_adapter *adapter)
4833{
4834 struct ibmvnic_login_rsp_buffer *login_rsp_buffer;
4835 struct ibmvnic_login_buffer *login_buffer;
4836 struct device *dev = &adapter->vdev->dev;
4837 struct vnic_login_client_data *vlcd;
4838 dma_addr_t rsp_buffer_token;
4839 dma_addr_t buffer_token;
4840 size_t rsp_buffer_size;
4841 union ibmvnic_crq crq;
4842 int client_data_len;
4843 size_t buffer_size;
4844 __be64 *tx_list_p;
4845 __be64 *rx_list_p;
4846 int rc;
4847 int i;
4848
4849 if (!adapter->tx_scrq || !adapter->rx_scrq) {
4850 netdev_err(adapter->netdev,
4851 "RX or TX queues are not allocated, device login failed\n");
4852 return -ENOMEM;
4853 }
4854
4855 release_login_buffer(adapter);
4856 release_login_rsp_buffer(adapter);
4857
4858 client_data_len = vnic_client_data_len(adapter);
4859
4860 buffer_size =
4861 sizeof(struct ibmvnic_login_buffer) +
4862 sizeof(u64) * (adapter->req_tx_queues + adapter->req_rx_queues) +
4863 client_data_len;
4864
4865 login_buffer = kzalloc(buffer_size, GFP_ATOMIC);
4866 if (!login_buffer)
4867 goto buf_alloc_failed;
4868
4869 buffer_token = dma_map_single(dev, login_buffer, buffer_size,
4870 DMA_TO_DEVICE);
4871 if (dma_mapping_error(dev, buffer_token)) {
4872 dev_err(dev, "Couldn't map login buffer\n");
4873 goto buf_map_failed;
4874 }
4875
4876 rsp_buffer_size = sizeof(struct ibmvnic_login_rsp_buffer) +
4877 sizeof(u64) * adapter->req_tx_queues +
4878 sizeof(u64) * adapter->req_rx_queues +
4879 sizeof(u64) * adapter->req_rx_queues +
4880 sizeof(u8) * IBMVNIC_TX_DESC_VERSIONS;
4881
4882 login_rsp_buffer = kmalloc(rsp_buffer_size, GFP_ATOMIC);
4883 if (!login_rsp_buffer)
4884 goto buf_rsp_alloc_failed;
4885
4886 rsp_buffer_token = dma_map_single(dev, login_rsp_buffer,
4887 rsp_buffer_size, DMA_FROM_DEVICE);
4888 if (dma_mapping_error(dev, rsp_buffer_token)) {
4889 dev_err(dev, "Couldn't map login rsp buffer\n");
4890 goto buf_rsp_map_failed;
4891 }
4892
4893 adapter->login_buf = login_buffer;
4894 adapter->login_buf_token = buffer_token;
4895 adapter->login_buf_sz = buffer_size;
4896 adapter->login_rsp_buf = login_rsp_buffer;
4897 adapter->login_rsp_buf_token = rsp_buffer_token;
4898 adapter->login_rsp_buf_sz = rsp_buffer_size;
4899
4900 login_buffer->len = cpu_to_be32(buffer_size);
4901 login_buffer->version = cpu_to_be32(INITIAL_VERSION_LB);
4902 login_buffer->num_txcomp_subcrqs = cpu_to_be32(adapter->req_tx_queues);
4903 login_buffer->off_txcomp_subcrqs =
4904 cpu_to_be32(sizeof(struct ibmvnic_login_buffer));
4905 login_buffer->num_rxcomp_subcrqs = cpu_to_be32(adapter->req_rx_queues);
4906 login_buffer->off_rxcomp_subcrqs =
4907 cpu_to_be32(sizeof(struct ibmvnic_login_buffer) +
4908 sizeof(u64) * adapter->req_tx_queues);
4909 login_buffer->login_rsp_ioba = cpu_to_be32(rsp_buffer_token);
4910 login_buffer->login_rsp_len = cpu_to_be32(rsp_buffer_size);
4911
4912 tx_list_p = (__be64 *)((char *)login_buffer +
4913 sizeof(struct ibmvnic_login_buffer));
4914 rx_list_p = (__be64 *)((char *)login_buffer +
4915 sizeof(struct ibmvnic_login_buffer) +
4916 sizeof(u64) * adapter->req_tx_queues);
4917
4918 for (i = 0; i < adapter->req_tx_queues; i++) {
4919 if (adapter->tx_scrq[i]) {
4920 tx_list_p[i] =
4921 cpu_to_be64(adapter->tx_scrq[i]->crq_num);
4922 }
4923 }
4924
4925 for (i = 0; i < adapter->req_rx_queues; i++) {
4926 if (adapter->rx_scrq[i]) {
4927 rx_list_p[i] =
4928 cpu_to_be64(adapter->rx_scrq[i]->crq_num);
4929 }
4930 }
4931
4932 /* Insert vNIC login client data */
4933 vlcd = (struct vnic_login_client_data *)
4934 ((char *)rx_list_p + (sizeof(u64) * adapter->req_rx_queues));
4935 login_buffer->client_data_offset =
4936 cpu_to_be32((char *)vlcd - (char *)login_buffer);
4937 login_buffer->client_data_len = cpu_to_be32(client_data_len);
4938
4939 vnic_add_client_data(adapter, vlcd);
4940
4941 netdev_dbg(adapter->netdev, "Login Buffer:\n");
4942 for (i = 0; i < (adapter->login_buf_sz - 1) / 8 + 1; i++) {
4943 netdev_dbg(adapter->netdev, "%016lx\n",
4944 ((unsigned long *)(adapter->login_buf))[i]);
4945 }
4946
4947 memset(&crq, 0, sizeof(crq));
4948 crq.login.first = IBMVNIC_CRQ_CMD;
4949 crq.login.cmd = LOGIN;
4950 crq.login.ioba = cpu_to_be32(buffer_token);
4951 crq.login.len = cpu_to_be32(buffer_size);
4952
4953 adapter->login_pending = true;
4954 rc = ibmvnic_send_crq(adapter, &crq);
4955 if (rc) {
4956 adapter->login_pending = false;
4957 netdev_err(adapter->netdev, "Failed to send login, rc=%d\n", rc);
4958 goto buf_send_failed;
4959 }
4960
4961 return 0;
4962
4963buf_send_failed:
4964 dma_unmap_single(dev, rsp_buffer_token, rsp_buffer_size,
4965 DMA_FROM_DEVICE);
4966buf_rsp_map_failed:
4967 kfree(login_rsp_buffer);
4968 adapter->login_rsp_buf = NULL;
4969buf_rsp_alloc_failed:
4970 dma_unmap_single(dev, buffer_token, buffer_size, DMA_TO_DEVICE);
4971buf_map_failed:
4972 kfree(login_buffer);
4973 adapter->login_buf = NULL;
4974buf_alloc_failed:
4975 return -ENOMEM;
4976}
4977
4978static int send_request_map(struct ibmvnic_adapter *adapter, dma_addr_t addr,
4979 u32 len, u8 map_id)
4980{
4981 union ibmvnic_crq crq;
4982
4983 memset(&crq, 0, sizeof(crq));
4984 crq.request_map.first = IBMVNIC_CRQ_CMD;
4985 crq.request_map.cmd = REQUEST_MAP;
4986 crq.request_map.map_id = map_id;
4987 crq.request_map.ioba = cpu_to_be32(addr);
4988 crq.request_map.len = cpu_to_be32(len);
4989 return ibmvnic_send_crq(adapter, &crq);
4990}
4991
4992static int send_request_unmap(struct ibmvnic_adapter *adapter, u8 map_id)
4993{
4994 union ibmvnic_crq crq;
4995
4996 memset(&crq, 0, sizeof(crq));
4997 crq.request_unmap.first = IBMVNIC_CRQ_CMD;
4998 crq.request_unmap.cmd = REQUEST_UNMAP;
4999 crq.request_unmap.map_id = map_id;
5000 return ibmvnic_send_crq(adapter, &crq);
5001}
5002
5003static void send_query_map(struct ibmvnic_adapter *adapter)
5004{
5005 union ibmvnic_crq crq;
5006
5007 memset(&crq, 0, sizeof(crq));
5008 crq.query_map.first = IBMVNIC_CRQ_CMD;
5009 crq.query_map.cmd = QUERY_MAP;
5010 ibmvnic_send_crq(adapter, &crq);
5011}
5012
5013/* Send a series of CRQs requesting various capabilities of the VNIC server */
5014static void send_query_cap(struct ibmvnic_adapter *adapter)
5015{
5016 union ibmvnic_crq crq;
5017 int cap_reqs;
5018
5019 /* We send out 25 QUERY_CAPABILITY CRQs below. Initialize this count
5020 * upfront. When the tasklet receives a response to all of these, it
5021 * can send out the next protocol messaage (REQUEST_CAPABILITY).
5022 */
5023 cap_reqs = 25;
5024
5025 atomic_set(&adapter->running_cap_crqs, cap_reqs);
5026
5027 memset(&crq, 0, sizeof(crq));
5028 crq.query_capability.first = IBMVNIC_CRQ_CMD;
5029 crq.query_capability.cmd = QUERY_CAPABILITY;
5030
5031 crq.query_capability.capability = cpu_to_be16(MIN_TX_QUEUES);
5032 ibmvnic_send_crq(adapter, &crq);
5033 cap_reqs--;
5034
5035 crq.query_capability.capability = cpu_to_be16(MIN_RX_QUEUES);
5036 ibmvnic_send_crq(adapter, &crq);
5037 cap_reqs--;
5038
5039 crq.query_capability.capability = cpu_to_be16(MIN_RX_ADD_QUEUES);
5040 ibmvnic_send_crq(adapter, &crq);
5041 cap_reqs--;
5042
5043 crq.query_capability.capability = cpu_to_be16(MAX_TX_QUEUES);
5044 ibmvnic_send_crq(adapter, &crq);
5045 cap_reqs--;
5046
5047 crq.query_capability.capability = cpu_to_be16(MAX_RX_QUEUES);
5048 ibmvnic_send_crq(adapter, &crq);
5049 cap_reqs--;
5050
5051 crq.query_capability.capability = cpu_to_be16(MAX_RX_ADD_QUEUES);
5052 ibmvnic_send_crq(adapter, &crq);
5053 cap_reqs--;
5054
5055 crq.query_capability.capability =
5056 cpu_to_be16(MIN_TX_ENTRIES_PER_SUBCRQ);
5057 ibmvnic_send_crq(adapter, &crq);
5058 cap_reqs--;
5059
5060 crq.query_capability.capability =
5061 cpu_to_be16(MIN_RX_ADD_ENTRIES_PER_SUBCRQ);
5062 ibmvnic_send_crq(adapter, &crq);
5063 cap_reqs--;
5064
5065 crq.query_capability.capability =
5066 cpu_to_be16(MAX_TX_ENTRIES_PER_SUBCRQ);
5067 ibmvnic_send_crq(adapter, &crq);
5068 cap_reqs--;
5069
5070 crq.query_capability.capability =
5071 cpu_to_be16(MAX_RX_ADD_ENTRIES_PER_SUBCRQ);
5072 ibmvnic_send_crq(adapter, &crq);
5073 cap_reqs--;
5074
5075 crq.query_capability.capability = cpu_to_be16(TCP_IP_OFFLOAD);
5076 ibmvnic_send_crq(adapter, &crq);
5077 cap_reqs--;
5078
5079 crq.query_capability.capability = cpu_to_be16(PROMISC_SUPPORTED);
5080 ibmvnic_send_crq(adapter, &crq);
5081 cap_reqs--;
5082
5083 crq.query_capability.capability = cpu_to_be16(MIN_MTU);
5084 ibmvnic_send_crq(adapter, &crq);
5085 cap_reqs--;
5086
5087 crq.query_capability.capability = cpu_to_be16(MAX_MTU);
5088 ibmvnic_send_crq(adapter, &crq);
5089 cap_reqs--;
5090
5091 crq.query_capability.capability = cpu_to_be16(MAX_MULTICAST_FILTERS);
5092 ibmvnic_send_crq(adapter, &crq);
5093 cap_reqs--;
5094
5095 crq.query_capability.capability = cpu_to_be16(VLAN_HEADER_INSERTION);
5096 ibmvnic_send_crq(adapter, &crq);
5097 cap_reqs--;
5098
5099 crq.query_capability.capability = cpu_to_be16(RX_VLAN_HEADER_INSERTION);
5100 ibmvnic_send_crq(adapter, &crq);
5101 cap_reqs--;
5102
5103 crq.query_capability.capability = cpu_to_be16(MAX_TX_SG_ENTRIES);
5104 ibmvnic_send_crq(adapter, &crq);
5105 cap_reqs--;
5106
5107 crq.query_capability.capability = cpu_to_be16(RX_SG_SUPPORTED);
5108 ibmvnic_send_crq(adapter, &crq);
5109 cap_reqs--;
5110
5111 crq.query_capability.capability = cpu_to_be16(OPT_TX_COMP_SUB_QUEUES);
5112 ibmvnic_send_crq(adapter, &crq);
5113 cap_reqs--;
5114
5115 crq.query_capability.capability = cpu_to_be16(OPT_RX_COMP_QUEUES);
5116 ibmvnic_send_crq(adapter, &crq);
5117 cap_reqs--;
5118
5119 crq.query_capability.capability =
5120 cpu_to_be16(OPT_RX_BUFADD_Q_PER_RX_COMP_Q);
5121 ibmvnic_send_crq(adapter, &crq);
5122 cap_reqs--;
5123
5124 crq.query_capability.capability =
5125 cpu_to_be16(OPT_TX_ENTRIES_PER_SUBCRQ);
5126 ibmvnic_send_crq(adapter, &crq);
5127 cap_reqs--;
5128
5129 crq.query_capability.capability =
5130 cpu_to_be16(OPT_RXBA_ENTRIES_PER_SUBCRQ);
5131 ibmvnic_send_crq(adapter, &crq);
5132 cap_reqs--;
5133
5134 crq.query_capability.capability = cpu_to_be16(TX_RX_DESC_REQ);
5135
5136 ibmvnic_send_crq(adapter, &crq);
5137 cap_reqs--;
5138
5139 /* Keep at end to catch any discrepancy between expected and actual
5140 * CRQs sent.
5141 */
5142 WARN_ON(cap_reqs != 0);
5143}
5144
5145static void send_query_ip_offload(struct ibmvnic_adapter *adapter)
5146{
5147 int buf_sz = sizeof(struct ibmvnic_query_ip_offload_buffer);
5148 struct device *dev = &adapter->vdev->dev;
5149 union ibmvnic_crq crq;
5150
5151 adapter->ip_offload_tok =
5152 dma_map_single(dev,
5153 &adapter->ip_offload_buf,
5154 buf_sz,
5155 DMA_FROM_DEVICE);
5156
5157 if (dma_mapping_error(dev, adapter->ip_offload_tok)) {
5158 if (!firmware_has_feature(FW_FEATURE_CMO))
5159 dev_err(dev, "Couldn't map offload buffer\n");
5160 return;
5161 }
5162
5163 memset(&crq, 0, sizeof(crq));
5164 crq.query_ip_offload.first = IBMVNIC_CRQ_CMD;
5165 crq.query_ip_offload.cmd = QUERY_IP_OFFLOAD;
5166 crq.query_ip_offload.len = cpu_to_be32(buf_sz);
5167 crq.query_ip_offload.ioba =
5168 cpu_to_be32(adapter->ip_offload_tok);
5169
5170 ibmvnic_send_crq(adapter, &crq);
5171}
5172
5173static void send_control_ip_offload(struct ibmvnic_adapter *adapter)
5174{
5175 struct ibmvnic_control_ip_offload_buffer *ctrl_buf = &adapter->ip_offload_ctrl;
5176 struct ibmvnic_query_ip_offload_buffer *buf = &adapter->ip_offload_buf;
5177 struct device *dev = &adapter->vdev->dev;
5178 netdev_features_t old_hw_features = 0;
5179 union ibmvnic_crq crq;
5180
5181 adapter->ip_offload_ctrl_tok =
5182 dma_map_single(dev,
5183 ctrl_buf,
5184 sizeof(adapter->ip_offload_ctrl),
5185 DMA_TO_DEVICE);
5186
5187 if (dma_mapping_error(dev, adapter->ip_offload_ctrl_tok)) {
5188 dev_err(dev, "Couldn't map ip offload control buffer\n");
5189 return;
5190 }
5191
5192 ctrl_buf->len = cpu_to_be32(sizeof(adapter->ip_offload_ctrl));
5193 ctrl_buf->version = cpu_to_be32(INITIAL_VERSION_IOB);
5194 ctrl_buf->ipv4_chksum = buf->ipv4_chksum;
5195 ctrl_buf->ipv6_chksum = buf->ipv6_chksum;
5196 ctrl_buf->tcp_ipv4_chksum = buf->tcp_ipv4_chksum;
5197 ctrl_buf->udp_ipv4_chksum = buf->udp_ipv4_chksum;
5198 ctrl_buf->tcp_ipv6_chksum = buf->tcp_ipv6_chksum;
5199 ctrl_buf->udp_ipv6_chksum = buf->udp_ipv6_chksum;
5200 ctrl_buf->large_tx_ipv4 = buf->large_tx_ipv4;
5201 ctrl_buf->large_tx_ipv6 = buf->large_tx_ipv6;
5202
5203 /* large_rx disabled for now, additional features needed */
5204 ctrl_buf->large_rx_ipv4 = 0;
5205 ctrl_buf->large_rx_ipv6 = 0;
5206
5207 if (adapter->state != VNIC_PROBING) {
5208 old_hw_features = adapter->netdev->hw_features;
5209 adapter->netdev->hw_features = 0;
5210 }
5211
5212 adapter->netdev->hw_features = NETIF_F_SG | NETIF_F_GSO | NETIF_F_GRO;
5213
5214 if (buf->tcp_ipv4_chksum || buf->udp_ipv4_chksum)
5215 adapter->netdev->hw_features |= NETIF_F_IP_CSUM;
5216
5217 if (buf->tcp_ipv6_chksum || buf->udp_ipv6_chksum)
5218 adapter->netdev->hw_features |= NETIF_F_IPV6_CSUM;
5219
5220 if ((adapter->netdev->features &
5221 (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM)))
5222 adapter->netdev->hw_features |= NETIF_F_RXCSUM;
5223
5224 if (buf->large_tx_ipv4)
5225 adapter->netdev->hw_features |= NETIF_F_TSO;
5226 if (buf->large_tx_ipv6)
5227 adapter->netdev->hw_features |= NETIF_F_TSO6;
5228
5229 if (adapter->state == VNIC_PROBING) {
5230 adapter->netdev->features |= adapter->netdev->hw_features;
5231 } else if (old_hw_features != adapter->netdev->hw_features) {
5232 netdev_features_t tmp = 0;
5233
5234 /* disable features no longer supported */
5235 adapter->netdev->features &= adapter->netdev->hw_features;
5236 /* turn on features now supported if previously enabled */
5237 tmp = (old_hw_features ^ adapter->netdev->hw_features) &
5238 adapter->netdev->hw_features;
5239 adapter->netdev->features |=
5240 tmp & adapter->netdev->wanted_features;
5241 }
5242
5243 memset(&crq, 0, sizeof(crq));
5244 crq.control_ip_offload.first = IBMVNIC_CRQ_CMD;
5245 crq.control_ip_offload.cmd = CONTROL_IP_OFFLOAD;
5246 crq.control_ip_offload.len =
5247 cpu_to_be32(sizeof(adapter->ip_offload_ctrl));
5248 crq.control_ip_offload.ioba = cpu_to_be32(adapter->ip_offload_ctrl_tok);
5249 ibmvnic_send_crq(adapter, &crq);
5250}
5251
5252static void handle_vpd_size_rsp(union ibmvnic_crq *crq,
5253 struct ibmvnic_adapter *adapter)
5254{
5255 struct device *dev = &adapter->vdev->dev;
5256
5257 if (crq->get_vpd_size_rsp.rc.code) {
5258 dev_err(dev, "Error retrieving VPD size, rc=%x\n",
5259 crq->get_vpd_size_rsp.rc.code);
5260 complete(&adapter->fw_done);
5261 return;
5262 }
5263
5264 adapter->vpd->len = be64_to_cpu(crq->get_vpd_size_rsp.len);
5265 complete(&adapter->fw_done);
5266}
5267
5268static void handle_vpd_rsp(union ibmvnic_crq *crq,
5269 struct ibmvnic_adapter *adapter)
5270{
5271 struct device *dev = &adapter->vdev->dev;
5272 unsigned char *substr = NULL;
5273 u8 fw_level_len = 0;
5274
5275 memset(adapter->fw_version, 0, 32);
5276
5277 dma_unmap_single(dev, adapter->vpd->dma_addr, adapter->vpd->len,
5278 DMA_FROM_DEVICE);
5279
5280 if (crq->get_vpd_rsp.rc.code) {
5281 dev_err(dev, "Error retrieving VPD from device, rc=%x\n",
5282 crq->get_vpd_rsp.rc.code);
5283 goto complete;
5284 }
5285
5286 /* get the position of the firmware version info
5287 * located after the ASCII 'RM' substring in the buffer
5288 */
5289 substr = strnstr(adapter->vpd->buff, "RM", adapter->vpd->len);
5290 if (!substr) {
5291 dev_info(dev, "Warning - No FW level has been provided in the VPD buffer by the VIOS Server\n");
5292 goto complete;
5293 }
5294
5295 /* get length of firmware level ASCII substring */
5296 if ((substr + 2) < (adapter->vpd->buff + adapter->vpd->len)) {
5297 fw_level_len = *(substr + 2);
5298 } else {
5299 dev_info(dev, "Length of FW substr extrapolated VDP buff\n");
5300 goto complete;
5301 }
5302
5303 /* copy firmware version string from vpd into adapter */
5304 if ((substr + 3 + fw_level_len) <
5305 (adapter->vpd->buff + adapter->vpd->len)) {
5306 strscpy(adapter->fw_version, substr + 3,
5307 sizeof(adapter->fw_version));
5308 } else {
5309 dev_info(dev, "FW substr extrapolated VPD buff\n");
5310 }
5311
5312complete:
5313 if (adapter->fw_version[0] == '\0')
5314 strscpy((char *)adapter->fw_version, "N/A", sizeof(adapter->fw_version));
5315 complete(&adapter->fw_done);
5316}
5317
5318static void handle_query_ip_offload_rsp(struct ibmvnic_adapter *adapter)
5319{
5320 struct device *dev = &adapter->vdev->dev;
5321 struct ibmvnic_query_ip_offload_buffer *buf = &adapter->ip_offload_buf;
5322 int i;
5323
5324 dma_unmap_single(dev, adapter->ip_offload_tok,
5325 sizeof(adapter->ip_offload_buf), DMA_FROM_DEVICE);
5326
5327 netdev_dbg(adapter->netdev, "Query IP Offload Buffer:\n");
5328 for (i = 0; i < (sizeof(adapter->ip_offload_buf) - 1) / 8 + 1; i++)
5329 netdev_dbg(adapter->netdev, "%016lx\n",
5330 ((unsigned long *)(buf))[i]);
5331
5332 netdev_dbg(adapter->netdev, "ipv4_chksum = %d\n", buf->ipv4_chksum);
5333 netdev_dbg(adapter->netdev, "ipv6_chksum = %d\n", buf->ipv6_chksum);
5334 netdev_dbg(adapter->netdev, "tcp_ipv4_chksum = %d\n",
5335 buf->tcp_ipv4_chksum);
5336 netdev_dbg(adapter->netdev, "tcp_ipv6_chksum = %d\n",
5337 buf->tcp_ipv6_chksum);
5338 netdev_dbg(adapter->netdev, "udp_ipv4_chksum = %d\n",
5339 buf->udp_ipv4_chksum);
5340 netdev_dbg(adapter->netdev, "udp_ipv6_chksum = %d\n",
5341 buf->udp_ipv6_chksum);
5342 netdev_dbg(adapter->netdev, "large_tx_ipv4 = %d\n",
5343 buf->large_tx_ipv4);
5344 netdev_dbg(adapter->netdev, "large_tx_ipv6 = %d\n",
5345 buf->large_tx_ipv6);
5346 netdev_dbg(adapter->netdev, "large_rx_ipv4 = %d\n",
5347 buf->large_rx_ipv4);
5348 netdev_dbg(adapter->netdev, "large_rx_ipv6 = %d\n",
5349 buf->large_rx_ipv6);
5350 netdev_dbg(adapter->netdev, "max_ipv4_hdr_sz = %d\n",
5351 buf->max_ipv4_header_size);
5352 netdev_dbg(adapter->netdev, "max_ipv6_hdr_sz = %d\n",
5353 buf->max_ipv6_header_size);
5354 netdev_dbg(adapter->netdev, "max_tcp_hdr_size = %d\n",
5355 buf->max_tcp_header_size);
5356 netdev_dbg(adapter->netdev, "max_udp_hdr_size = %d\n",
5357 buf->max_udp_header_size);
5358 netdev_dbg(adapter->netdev, "max_large_tx_size = %d\n",
5359 buf->max_large_tx_size);
5360 netdev_dbg(adapter->netdev, "max_large_rx_size = %d\n",
5361 buf->max_large_rx_size);
5362 netdev_dbg(adapter->netdev, "ipv6_ext_hdr = %d\n",
5363 buf->ipv6_extension_header);
5364 netdev_dbg(adapter->netdev, "tcp_pseudosum_req = %d\n",
5365 buf->tcp_pseudosum_req);
5366 netdev_dbg(adapter->netdev, "num_ipv6_ext_hd = %d\n",
5367 buf->num_ipv6_ext_headers);
5368 netdev_dbg(adapter->netdev, "off_ipv6_ext_hd = %d\n",
5369 buf->off_ipv6_ext_headers);
5370
5371 send_control_ip_offload(adapter);
5372}
5373
5374static const char *ibmvnic_fw_err_cause(u16 cause)
5375{
5376 switch (cause) {
5377 case ADAPTER_PROBLEM:
5378 return "adapter problem";
5379 case BUS_PROBLEM:
5380 return "bus problem";
5381 case FW_PROBLEM:
5382 return "firmware problem";
5383 case DD_PROBLEM:
5384 return "device driver problem";
5385 case EEH_RECOVERY:
5386 return "EEH recovery";
5387 case FW_UPDATED:
5388 return "firmware updated";
5389 case LOW_MEMORY:
5390 return "low Memory";
5391 default:
5392 return "unknown";
5393 }
5394}
5395
5396static void handle_error_indication(union ibmvnic_crq *crq,
5397 struct ibmvnic_adapter *adapter)
5398{
5399 struct device *dev = &adapter->vdev->dev;
5400 u16 cause;
5401
5402 cause = be16_to_cpu(crq->error_indication.error_cause);
5403
5404 dev_warn_ratelimited(dev,
5405 "Firmware reports %serror, cause: %s. Starting recovery...\n",
5406 crq->error_indication.flags
5407 & IBMVNIC_FATAL_ERROR ? "FATAL " : "",
5408 ibmvnic_fw_err_cause(cause));
5409
5410 if (crq->error_indication.flags & IBMVNIC_FATAL_ERROR)
5411 ibmvnic_reset(adapter, VNIC_RESET_FATAL);
5412 else
5413 ibmvnic_reset(adapter, VNIC_RESET_NON_FATAL);
5414}
5415
5416static int handle_change_mac_rsp(union ibmvnic_crq *crq,
5417 struct ibmvnic_adapter *adapter)
5418{
5419 struct net_device *netdev = adapter->netdev;
5420 struct device *dev = &adapter->vdev->dev;
5421 long rc;
5422
5423 rc = crq->change_mac_addr_rsp.rc.code;
5424 if (rc) {
5425 dev_err(dev, "Error %ld in CHANGE_MAC_ADDR_RSP\n", rc);
5426 goto out;
5427 }
5428 /* crq->change_mac_addr.mac_addr is the requested one
5429 * crq->change_mac_addr_rsp.mac_addr is the returned valid one.
5430 */
5431 eth_hw_addr_set(netdev, &crq->change_mac_addr_rsp.mac_addr[0]);
5432 ether_addr_copy(adapter->mac_addr,
5433 &crq->change_mac_addr_rsp.mac_addr[0]);
5434out:
5435 complete(&adapter->fw_done);
5436 return rc;
5437}
5438
5439static void handle_request_cap_rsp(union ibmvnic_crq *crq,
5440 struct ibmvnic_adapter *adapter)
5441{
5442 struct device *dev = &adapter->vdev->dev;
5443 u64 *req_value;
5444 char *name;
5445
5446 atomic_dec(&adapter->running_cap_crqs);
5447 netdev_dbg(adapter->netdev, "Outstanding request-caps: %d\n",
5448 atomic_read(&adapter->running_cap_crqs));
5449 switch (be16_to_cpu(crq->request_capability_rsp.capability)) {
5450 case REQ_TX_QUEUES:
5451 req_value = &adapter->req_tx_queues;
5452 name = "tx";
5453 break;
5454 case REQ_RX_QUEUES:
5455 req_value = &adapter->req_rx_queues;
5456 name = "rx";
5457 break;
5458 case REQ_RX_ADD_QUEUES:
5459 req_value = &adapter->req_rx_add_queues;
5460 name = "rx_add";
5461 break;
5462 case REQ_TX_ENTRIES_PER_SUBCRQ:
5463 req_value = &adapter->req_tx_entries_per_subcrq;
5464 name = "tx_entries_per_subcrq";
5465 break;
5466 case REQ_RX_ADD_ENTRIES_PER_SUBCRQ:
5467 req_value = &adapter->req_rx_add_entries_per_subcrq;
5468 name = "rx_add_entries_per_subcrq";
5469 break;
5470 case REQ_MTU:
5471 req_value = &adapter->req_mtu;
5472 name = "mtu";
5473 break;
5474 case PROMISC_REQUESTED:
5475 req_value = &adapter->promisc;
5476 name = "promisc";
5477 break;
5478 default:
5479 dev_err(dev, "Got invalid cap request rsp %d\n",
5480 crq->request_capability.capability);
5481 return;
5482 }
5483
5484 switch (crq->request_capability_rsp.rc.code) {
5485 case SUCCESS:
5486 break;
5487 case PARTIALSUCCESS:
5488 dev_info(dev, "req=%lld, rsp=%ld in %s queue, retrying.\n",
5489 *req_value,
5490 (long)be64_to_cpu(crq->request_capability_rsp.number),
5491 name);
5492
5493 if (be16_to_cpu(crq->request_capability_rsp.capability) ==
5494 REQ_MTU) {
5495 pr_err("mtu of %llu is not supported. Reverting.\n",
5496 *req_value);
5497 *req_value = adapter->fallback.mtu;
5498 } else {
5499 *req_value =
5500 be64_to_cpu(crq->request_capability_rsp.number);
5501 }
5502
5503 send_request_cap(adapter, 1);
5504 return;
5505 default:
5506 dev_err(dev, "Error %d in request cap rsp\n",
5507 crq->request_capability_rsp.rc.code);
5508 return;
5509 }
5510
5511 /* Done receiving requested capabilities, query IP offload support */
5512 if (atomic_read(&adapter->running_cap_crqs) == 0)
5513 send_query_ip_offload(adapter);
5514}
5515
5516static int handle_login_rsp(union ibmvnic_crq *login_rsp_crq,
5517 struct ibmvnic_adapter *adapter)
5518{
5519 struct device *dev = &adapter->vdev->dev;
5520 struct net_device *netdev = adapter->netdev;
5521 struct ibmvnic_login_rsp_buffer *login_rsp = adapter->login_rsp_buf;
5522 struct ibmvnic_login_buffer *login = adapter->login_buf;
5523 u64 *tx_handle_array;
5524 u64 *rx_handle_array;
5525 int num_tx_pools;
5526 int num_rx_pools;
5527 u64 *size_array;
5528 u32 rsp_len;
5529 int i;
5530
5531 /* CHECK: Test/set of login_pending does not need to be atomic
5532 * because only ibmvnic_tasklet tests/clears this.
5533 */
5534 if (!adapter->login_pending) {
5535 netdev_warn(netdev, "Ignoring unexpected login response\n");
5536 return 0;
5537 }
5538 adapter->login_pending = false;
5539
5540 /* If the number of queues requested can't be allocated by the
5541 * server, the login response will return with code 1. We will need
5542 * to resend the login buffer with fewer queues requested.
5543 */
5544 if (login_rsp_crq->generic.rc.code) {
5545 adapter->init_done_rc = login_rsp_crq->generic.rc.code;
5546 complete(&adapter->init_done);
5547 return 0;
5548 }
5549
5550 if (adapter->failover_pending) {
5551 adapter->init_done_rc = -EAGAIN;
5552 netdev_dbg(netdev, "Failover pending, ignoring login response\n");
5553 complete(&adapter->init_done);
5554 /* login response buffer will be released on reset */
5555 return 0;
5556 }
5557
5558 netdev->mtu = adapter->req_mtu - ETH_HLEN;
5559
5560 netdev_dbg(adapter->netdev, "Login Response Buffer:\n");
5561 for (i = 0; i < (adapter->login_rsp_buf_sz - 1) / 8 + 1; i++) {
5562 netdev_dbg(adapter->netdev, "%016lx\n",
5563 ((unsigned long *)(adapter->login_rsp_buf))[i]);
5564 }
5565
5566 /* Sanity checks */
5567 if (login->num_txcomp_subcrqs != login_rsp->num_txsubm_subcrqs ||
5568 (be32_to_cpu(login->num_rxcomp_subcrqs) *
5569 adapter->req_rx_add_queues !=
5570 be32_to_cpu(login_rsp->num_rxadd_subcrqs))) {
5571 dev_err(dev, "FATAL: Inconsistent login and login rsp\n");
5572 ibmvnic_reset(adapter, VNIC_RESET_FATAL);
5573 return -EIO;
5574 }
5575
5576 rsp_len = be32_to_cpu(login_rsp->len);
5577 if (be32_to_cpu(login->login_rsp_len) < rsp_len ||
5578 rsp_len <= be32_to_cpu(login_rsp->off_txsubm_subcrqs) ||
5579 rsp_len <= be32_to_cpu(login_rsp->off_rxadd_subcrqs) ||
5580 rsp_len <= be32_to_cpu(login_rsp->off_rxadd_buff_size) ||
5581 rsp_len <= be32_to_cpu(login_rsp->off_supp_tx_desc)) {
5582 /* This can happen if a login request times out and there are
5583 * 2 outstanding login requests sent, the LOGIN_RSP crq
5584 * could have been for the older login request. So we are
5585 * parsing the newer response buffer which may be incomplete
5586 */
5587 dev_err(dev, "FATAL: Login rsp offsets/lengths invalid\n");
5588 ibmvnic_reset(adapter, VNIC_RESET_FATAL);
5589 return -EIO;
5590 }
5591
5592 size_array = (u64 *)((u8 *)(adapter->login_rsp_buf) +
5593 be32_to_cpu(adapter->login_rsp_buf->off_rxadd_buff_size));
5594 /* variable buffer sizes are not supported, so just read the
5595 * first entry.
5596 */
5597 adapter->cur_rx_buf_sz = be64_to_cpu(size_array[0]);
5598
5599 num_tx_pools = be32_to_cpu(adapter->login_rsp_buf->num_txsubm_subcrqs);
5600 num_rx_pools = be32_to_cpu(adapter->login_rsp_buf->num_rxadd_subcrqs);
5601
5602 tx_handle_array = (u64 *)((u8 *)(adapter->login_rsp_buf) +
5603 be32_to_cpu(adapter->login_rsp_buf->off_txsubm_subcrqs));
5604 rx_handle_array = (u64 *)((u8 *)(adapter->login_rsp_buf) +
5605 be32_to_cpu(adapter->login_rsp_buf->off_rxadd_subcrqs));
5606
5607 for (i = 0; i < num_tx_pools; i++)
5608 adapter->tx_scrq[i]->handle = tx_handle_array[i];
5609
5610 for (i = 0; i < num_rx_pools; i++)
5611 adapter->rx_scrq[i]->handle = rx_handle_array[i];
5612
5613 adapter->num_active_tx_scrqs = num_tx_pools;
5614 adapter->num_active_rx_scrqs = num_rx_pools;
5615 release_login_rsp_buffer(adapter);
5616 release_login_buffer(adapter);
5617 complete(&adapter->init_done);
5618
5619 return 0;
5620}
5621
5622static void handle_request_unmap_rsp(union ibmvnic_crq *crq,
5623 struct ibmvnic_adapter *adapter)
5624{
5625 struct device *dev = &adapter->vdev->dev;
5626 long rc;
5627
5628 rc = crq->request_unmap_rsp.rc.code;
5629 if (rc)
5630 dev_err(dev, "Error %ld in REQUEST_UNMAP_RSP\n", rc);
5631}
5632
5633static void handle_query_map_rsp(union ibmvnic_crq *crq,
5634 struct ibmvnic_adapter *adapter)
5635{
5636 struct net_device *netdev = adapter->netdev;
5637 struct device *dev = &adapter->vdev->dev;
5638 long rc;
5639
5640 rc = crq->query_map_rsp.rc.code;
5641 if (rc) {
5642 dev_err(dev, "Error %ld in QUERY_MAP_RSP\n", rc);
5643 return;
5644 }
5645 netdev_dbg(netdev, "page_size = %d\ntot_pages = %u\nfree_pages = %u\n",
5646 crq->query_map_rsp.page_size,
5647 __be32_to_cpu(crq->query_map_rsp.tot_pages),
5648 __be32_to_cpu(crq->query_map_rsp.free_pages));
5649}
5650
5651static void handle_query_cap_rsp(union ibmvnic_crq *crq,
5652 struct ibmvnic_adapter *adapter)
5653{
5654 struct net_device *netdev = adapter->netdev;
5655 struct device *dev = &adapter->vdev->dev;
5656 long rc;
5657
5658 atomic_dec(&adapter->running_cap_crqs);
5659 netdev_dbg(netdev, "Outstanding queries: %d\n",
5660 atomic_read(&adapter->running_cap_crqs));
5661 rc = crq->query_capability.rc.code;
5662 if (rc) {
5663 dev_err(dev, "Error %ld in QUERY_CAP_RSP\n", rc);
5664 goto out;
5665 }
5666
5667 switch (be16_to_cpu(crq->query_capability.capability)) {
5668 case MIN_TX_QUEUES:
5669 adapter->min_tx_queues =
5670 be64_to_cpu(crq->query_capability.number);
5671 netdev_dbg(netdev, "min_tx_queues = %lld\n",
5672 adapter->min_tx_queues);
5673 break;
5674 case MIN_RX_QUEUES:
5675 adapter->min_rx_queues =
5676 be64_to_cpu(crq->query_capability.number);
5677 netdev_dbg(netdev, "min_rx_queues = %lld\n",
5678 adapter->min_rx_queues);
5679 break;
5680 case MIN_RX_ADD_QUEUES:
5681 adapter->min_rx_add_queues =
5682 be64_to_cpu(crq->query_capability.number);
5683 netdev_dbg(netdev, "min_rx_add_queues = %lld\n",
5684 adapter->min_rx_add_queues);
5685 break;
5686 case MAX_TX_QUEUES:
5687 adapter->max_tx_queues =
5688 be64_to_cpu(crq->query_capability.number);
5689 netdev_dbg(netdev, "max_tx_queues = %lld\n",
5690 adapter->max_tx_queues);
5691 break;
5692 case MAX_RX_QUEUES:
5693 adapter->max_rx_queues =
5694 be64_to_cpu(crq->query_capability.number);
5695 netdev_dbg(netdev, "max_rx_queues = %lld\n",
5696 adapter->max_rx_queues);
5697 break;
5698 case MAX_RX_ADD_QUEUES:
5699 adapter->max_rx_add_queues =
5700 be64_to_cpu(crq->query_capability.number);
5701 netdev_dbg(netdev, "max_rx_add_queues = %lld\n",
5702 adapter->max_rx_add_queues);
5703 break;
5704 case MIN_TX_ENTRIES_PER_SUBCRQ:
5705 adapter->min_tx_entries_per_subcrq =
5706 be64_to_cpu(crq->query_capability.number);
5707 netdev_dbg(netdev, "min_tx_entries_per_subcrq = %lld\n",
5708 adapter->min_tx_entries_per_subcrq);
5709 break;
5710 case MIN_RX_ADD_ENTRIES_PER_SUBCRQ:
5711 adapter->min_rx_add_entries_per_subcrq =
5712 be64_to_cpu(crq->query_capability.number);
5713 netdev_dbg(netdev, "min_rx_add_entrs_per_subcrq = %lld\n",
5714 adapter->min_rx_add_entries_per_subcrq);
5715 break;
5716 case MAX_TX_ENTRIES_PER_SUBCRQ:
5717 adapter->max_tx_entries_per_subcrq =
5718 be64_to_cpu(crq->query_capability.number);
5719 netdev_dbg(netdev, "max_tx_entries_per_subcrq = %lld\n",
5720 adapter->max_tx_entries_per_subcrq);
5721 break;
5722 case MAX_RX_ADD_ENTRIES_PER_SUBCRQ:
5723 adapter->max_rx_add_entries_per_subcrq =
5724 be64_to_cpu(crq->query_capability.number);
5725 netdev_dbg(netdev, "max_rx_add_entrs_per_subcrq = %lld\n",
5726 adapter->max_rx_add_entries_per_subcrq);
5727 break;
5728 case TCP_IP_OFFLOAD:
5729 adapter->tcp_ip_offload =
5730 be64_to_cpu(crq->query_capability.number);
5731 netdev_dbg(netdev, "tcp_ip_offload = %lld\n",
5732 adapter->tcp_ip_offload);
5733 break;
5734 case PROMISC_SUPPORTED:
5735 adapter->promisc_supported =
5736 be64_to_cpu(crq->query_capability.number);
5737 netdev_dbg(netdev, "promisc_supported = %lld\n",
5738 adapter->promisc_supported);
5739 break;
5740 case MIN_MTU:
5741 adapter->min_mtu = be64_to_cpu(crq->query_capability.number);
5742 netdev->min_mtu = adapter->min_mtu - ETH_HLEN;
5743 netdev_dbg(netdev, "min_mtu = %lld\n", adapter->min_mtu);
5744 break;
5745 case MAX_MTU:
5746 adapter->max_mtu = be64_to_cpu(crq->query_capability.number);
5747 netdev->max_mtu = adapter->max_mtu - ETH_HLEN;
5748 netdev_dbg(netdev, "max_mtu = %lld\n", adapter->max_mtu);
5749 break;
5750 case MAX_MULTICAST_FILTERS:
5751 adapter->max_multicast_filters =
5752 be64_to_cpu(crq->query_capability.number);
5753 netdev_dbg(netdev, "max_multicast_filters = %lld\n",
5754 adapter->max_multicast_filters);
5755 break;
5756 case VLAN_HEADER_INSERTION:
5757 adapter->vlan_header_insertion =
5758 be64_to_cpu(crq->query_capability.number);
5759 if (adapter->vlan_header_insertion)
5760 netdev->features |= NETIF_F_HW_VLAN_STAG_TX;
5761 netdev_dbg(netdev, "vlan_header_insertion = %lld\n",
5762 adapter->vlan_header_insertion);
5763 break;
5764 case RX_VLAN_HEADER_INSERTION:
5765 adapter->rx_vlan_header_insertion =
5766 be64_to_cpu(crq->query_capability.number);
5767 netdev_dbg(netdev, "rx_vlan_header_insertion = %lld\n",
5768 adapter->rx_vlan_header_insertion);
5769 break;
5770 case MAX_TX_SG_ENTRIES:
5771 adapter->max_tx_sg_entries =
5772 be64_to_cpu(crq->query_capability.number);
5773 netdev_dbg(netdev, "max_tx_sg_entries = %lld\n",
5774 adapter->max_tx_sg_entries);
5775 break;
5776 case RX_SG_SUPPORTED:
5777 adapter->rx_sg_supported =
5778 be64_to_cpu(crq->query_capability.number);
5779 netdev_dbg(netdev, "rx_sg_supported = %lld\n",
5780 adapter->rx_sg_supported);
5781 break;
5782 case OPT_TX_COMP_SUB_QUEUES:
5783 adapter->opt_tx_comp_sub_queues =
5784 be64_to_cpu(crq->query_capability.number);
5785 netdev_dbg(netdev, "opt_tx_comp_sub_queues = %lld\n",
5786 adapter->opt_tx_comp_sub_queues);
5787 break;
5788 case OPT_RX_COMP_QUEUES:
5789 adapter->opt_rx_comp_queues =
5790 be64_to_cpu(crq->query_capability.number);
5791 netdev_dbg(netdev, "opt_rx_comp_queues = %lld\n",
5792 adapter->opt_rx_comp_queues);
5793 break;
5794 case OPT_RX_BUFADD_Q_PER_RX_COMP_Q:
5795 adapter->opt_rx_bufadd_q_per_rx_comp_q =
5796 be64_to_cpu(crq->query_capability.number);
5797 netdev_dbg(netdev, "opt_rx_bufadd_q_per_rx_comp_q = %lld\n",
5798 adapter->opt_rx_bufadd_q_per_rx_comp_q);
5799 break;
5800 case OPT_TX_ENTRIES_PER_SUBCRQ:
5801 adapter->opt_tx_entries_per_subcrq =
5802 be64_to_cpu(crq->query_capability.number);
5803 netdev_dbg(netdev, "opt_tx_entries_per_subcrq = %lld\n",
5804 adapter->opt_tx_entries_per_subcrq);
5805 break;
5806 case OPT_RXBA_ENTRIES_PER_SUBCRQ:
5807 adapter->opt_rxba_entries_per_subcrq =
5808 be64_to_cpu(crq->query_capability.number);
5809 netdev_dbg(netdev, "opt_rxba_entries_per_subcrq = %lld\n",
5810 adapter->opt_rxba_entries_per_subcrq);
5811 break;
5812 case TX_RX_DESC_REQ:
5813 adapter->tx_rx_desc_req = crq->query_capability.number;
5814 netdev_dbg(netdev, "tx_rx_desc_req = %llx\n",
5815 adapter->tx_rx_desc_req);
5816 break;
5817
5818 default:
5819 netdev_err(netdev, "Got invalid cap rsp %d\n",
5820 crq->query_capability.capability);
5821 }
5822
5823out:
5824 if (atomic_read(&adapter->running_cap_crqs) == 0)
5825 send_request_cap(adapter, 0);
5826}
5827
5828static int send_query_phys_parms(struct ibmvnic_adapter *adapter)
5829{
5830 union ibmvnic_crq crq;
5831 int rc;
5832
5833 memset(&crq, 0, sizeof(crq));
5834 crq.query_phys_parms.first = IBMVNIC_CRQ_CMD;
5835 crq.query_phys_parms.cmd = QUERY_PHYS_PARMS;
5836
5837 mutex_lock(&adapter->fw_lock);
5838 adapter->fw_done_rc = 0;
5839 reinit_completion(&adapter->fw_done);
5840
5841 rc = ibmvnic_send_crq(adapter, &crq);
5842 if (rc) {
5843 mutex_unlock(&adapter->fw_lock);
5844 return rc;
5845 }
5846
5847 rc = ibmvnic_wait_for_completion(adapter, &adapter->fw_done, 10000);
5848 if (rc) {
5849 mutex_unlock(&adapter->fw_lock);
5850 return rc;
5851 }
5852
5853 mutex_unlock(&adapter->fw_lock);
5854 return adapter->fw_done_rc ? -EIO : 0;
5855}
5856
5857static int handle_query_phys_parms_rsp(union ibmvnic_crq *crq,
5858 struct ibmvnic_adapter *adapter)
5859{
5860 struct net_device *netdev = adapter->netdev;
5861 int rc;
5862 __be32 rspeed = cpu_to_be32(crq->query_phys_parms_rsp.speed);
5863
5864 rc = crq->query_phys_parms_rsp.rc.code;
5865 if (rc) {
5866 netdev_err(netdev, "Error %d in QUERY_PHYS_PARMS\n", rc);
5867 return rc;
5868 }
5869 switch (rspeed) {
5870 case IBMVNIC_10MBPS:
5871 adapter->speed = SPEED_10;
5872 break;
5873 case IBMVNIC_100MBPS:
5874 adapter->speed = SPEED_100;
5875 break;
5876 case IBMVNIC_1GBPS:
5877 adapter->speed = SPEED_1000;
5878 break;
5879 case IBMVNIC_10GBPS:
5880 adapter->speed = SPEED_10000;
5881 break;
5882 case IBMVNIC_25GBPS:
5883 adapter->speed = SPEED_25000;
5884 break;
5885 case IBMVNIC_40GBPS:
5886 adapter->speed = SPEED_40000;
5887 break;
5888 case IBMVNIC_50GBPS:
5889 adapter->speed = SPEED_50000;
5890 break;
5891 case IBMVNIC_100GBPS:
5892 adapter->speed = SPEED_100000;
5893 break;
5894 case IBMVNIC_200GBPS:
5895 adapter->speed = SPEED_200000;
5896 break;
5897 default:
5898 if (netif_carrier_ok(netdev))
5899 netdev_warn(netdev, "Unknown speed 0x%08x\n", rspeed);
5900 adapter->speed = SPEED_UNKNOWN;
5901 }
5902 if (crq->query_phys_parms_rsp.flags1 & IBMVNIC_FULL_DUPLEX)
5903 adapter->duplex = DUPLEX_FULL;
5904 else if (crq->query_phys_parms_rsp.flags1 & IBMVNIC_HALF_DUPLEX)
5905 adapter->duplex = DUPLEX_HALF;
5906 else
5907 adapter->duplex = DUPLEX_UNKNOWN;
5908
5909 return rc;
5910}
5911
5912static void ibmvnic_handle_crq(union ibmvnic_crq *crq,
5913 struct ibmvnic_adapter *adapter)
5914{
5915 struct ibmvnic_generic_crq *gen_crq = &crq->generic;
5916 struct net_device *netdev = adapter->netdev;
5917 struct device *dev = &adapter->vdev->dev;
5918 u64 *u64_crq = (u64 *)crq;
5919 long rc;
5920
5921 netdev_dbg(netdev, "Handling CRQ: %016lx %016lx\n",
5922 (unsigned long)cpu_to_be64(u64_crq[0]),
5923 (unsigned long)cpu_to_be64(u64_crq[1]));
5924 switch (gen_crq->first) {
5925 case IBMVNIC_CRQ_INIT_RSP:
5926 switch (gen_crq->cmd) {
5927 case IBMVNIC_CRQ_INIT:
5928 dev_info(dev, "Partner initialized\n");
5929 adapter->from_passive_init = true;
5930 /* Discard any stale login responses from prev reset.
5931 * CHECK: should we clear even on INIT_COMPLETE?
5932 */
5933 adapter->login_pending = false;
5934
5935 if (adapter->state == VNIC_DOWN)
5936 rc = ibmvnic_reset(adapter, VNIC_RESET_PASSIVE_INIT);
5937 else
5938 rc = ibmvnic_reset(adapter, VNIC_RESET_FAILOVER);
5939
5940 if (rc && rc != -EBUSY) {
5941 /* We were unable to schedule the failover
5942 * reset either because the adapter was still
5943 * probing (eg: during kexec) or we could not
5944 * allocate memory. Clear the failover_pending
5945 * flag since no one else will. We ignore
5946 * EBUSY because it means either FAILOVER reset
5947 * is already scheduled or the adapter is
5948 * being removed.
5949 */
5950 netdev_err(netdev,
5951 "Error %ld scheduling failover reset\n",
5952 rc);
5953 adapter->failover_pending = false;
5954 }
5955
5956 if (!completion_done(&adapter->init_done)) {
5957 if (!adapter->init_done_rc)
5958 adapter->init_done_rc = -EAGAIN;
5959 complete(&adapter->init_done);
5960 }
5961
5962 break;
5963 case IBMVNIC_CRQ_INIT_COMPLETE:
5964 dev_info(dev, "Partner initialization complete\n");
5965 adapter->crq.active = true;
5966 send_version_xchg(adapter);
5967 break;
5968 default:
5969 dev_err(dev, "Unknown crq cmd: %d\n", gen_crq->cmd);
5970 }
5971 return;
5972 case IBMVNIC_CRQ_XPORT_EVENT:
5973 netif_carrier_off(netdev);
5974 adapter->crq.active = false;
5975 /* terminate any thread waiting for a response
5976 * from the device
5977 */
5978 if (!completion_done(&adapter->fw_done)) {
5979 adapter->fw_done_rc = -EIO;
5980 complete(&adapter->fw_done);
5981 }
5982
5983 /* if we got here during crq-init, retry crq-init */
5984 if (!completion_done(&adapter->init_done)) {
5985 adapter->init_done_rc = -EAGAIN;
5986 complete(&adapter->init_done);
5987 }
5988
5989 if (!completion_done(&adapter->stats_done))
5990 complete(&adapter->stats_done);
5991 if (test_bit(0, &adapter->resetting))
5992 adapter->force_reset_recovery = true;
5993 if (gen_crq->cmd == IBMVNIC_PARTITION_MIGRATED) {
5994 dev_info(dev, "Migrated, re-enabling adapter\n");
5995 ibmvnic_reset(adapter, VNIC_RESET_MOBILITY);
5996 } else if (gen_crq->cmd == IBMVNIC_DEVICE_FAILOVER) {
5997 dev_info(dev, "Backing device failover detected\n");
5998 adapter->failover_pending = true;
5999 } else {
6000 /* The adapter lost the connection */
6001 dev_err(dev, "Virtual Adapter failed (rc=%d)\n",
6002 gen_crq->cmd);
6003 ibmvnic_reset(adapter, VNIC_RESET_FATAL);
6004 }
6005 return;
6006 case IBMVNIC_CRQ_CMD_RSP:
6007 break;
6008 default:
6009 dev_err(dev, "Got an invalid msg type 0x%02x\n",
6010 gen_crq->first);
6011 return;
6012 }
6013
6014 switch (gen_crq->cmd) {
6015 case VERSION_EXCHANGE_RSP:
6016 rc = crq->version_exchange_rsp.rc.code;
6017 if (rc) {
6018 dev_err(dev, "Error %ld in VERSION_EXCHG_RSP\n", rc);
6019 break;
6020 }
6021 ibmvnic_version =
6022 be16_to_cpu(crq->version_exchange_rsp.version);
6023 dev_info(dev, "Partner protocol version is %d\n",
6024 ibmvnic_version);
6025 send_query_cap(adapter);
6026 break;
6027 case QUERY_CAPABILITY_RSP:
6028 handle_query_cap_rsp(crq, adapter);
6029 break;
6030 case QUERY_MAP_RSP:
6031 handle_query_map_rsp(crq, adapter);
6032 break;
6033 case REQUEST_MAP_RSP:
6034 adapter->fw_done_rc = crq->request_map_rsp.rc.code;
6035 complete(&adapter->fw_done);
6036 break;
6037 case REQUEST_UNMAP_RSP:
6038 handle_request_unmap_rsp(crq, adapter);
6039 break;
6040 case REQUEST_CAPABILITY_RSP:
6041 handle_request_cap_rsp(crq, adapter);
6042 break;
6043 case LOGIN_RSP:
6044 netdev_dbg(netdev, "Got Login Response\n");
6045 handle_login_rsp(crq, adapter);
6046 break;
6047 case LOGICAL_LINK_STATE_RSP:
6048 netdev_dbg(netdev,
6049 "Got Logical Link State Response, state: %d rc: %d\n",
6050 crq->logical_link_state_rsp.link_state,
6051 crq->logical_link_state_rsp.rc.code);
6052 adapter->logical_link_state =
6053 crq->logical_link_state_rsp.link_state;
6054 adapter->init_done_rc = crq->logical_link_state_rsp.rc.code;
6055 complete(&adapter->init_done);
6056 break;
6057 case LINK_STATE_INDICATION:
6058 netdev_dbg(netdev, "Got Logical Link State Indication\n");
6059 adapter->phys_link_state =
6060 crq->link_state_indication.phys_link_state;
6061 adapter->logical_link_state =
6062 crq->link_state_indication.logical_link_state;
6063 if (adapter->phys_link_state && adapter->logical_link_state)
6064 netif_carrier_on(netdev);
6065 else
6066 netif_carrier_off(netdev);
6067 break;
6068 case CHANGE_MAC_ADDR_RSP:
6069 netdev_dbg(netdev, "Got MAC address change Response\n");
6070 adapter->fw_done_rc = handle_change_mac_rsp(crq, adapter);
6071 break;
6072 case ERROR_INDICATION:
6073 netdev_dbg(netdev, "Got Error Indication\n");
6074 handle_error_indication(crq, adapter);
6075 break;
6076 case REQUEST_STATISTICS_RSP:
6077 netdev_dbg(netdev, "Got Statistics Response\n");
6078 complete(&adapter->stats_done);
6079 break;
6080 case QUERY_IP_OFFLOAD_RSP:
6081 netdev_dbg(netdev, "Got Query IP offload Response\n");
6082 handle_query_ip_offload_rsp(adapter);
6083 break;
6084 case MULTICAST_CTRL_RSP:
6085 netdev_dbg(netdev, "Got multicast control Response\n");
6086 break;
6087 case CONTROL_IP_OFFLOAD_RSP:
6088 netdev_dbg(netdev, "Got Control IP offload Response\n");
6089 dma_unmap_single(dev, adapter->ip_offload_ctrl_tok,
6090 sizeof(adapter->ip_offload_ctrl),
6091 DMA_TO_DEVICE);
6092 complete(&adapter->init_done);
6093 break;
6094 case COLLECT_FW_TRACE_RSP:
6095 netdev_dbg(netdev, "Got Collect firmware trace Response\n");
6096 complete(&adapter->fw_done);
6097 break;
6098 case GET_VPD_SIZE_RSP:
6099 handle_vpd_size_rsp(crq, adapter);
6100 break;
6101 case GET_VPD_RSP:
6102 handle_vpd_rsp(crq, adapter);
6103 break;
6104 case QUERY_PHYS_PARMS_RSP:
6105 adapter->fw_done_rc = handle_query_phys_parms_rsp(crq, adapter);
6106 complete(&adapter->fw_done);
6107 break;
6108 default:
6109 netdev_err(netdev, "Got an invalid cmd type 0x%02x\n",
6110 gen_crq->cmd);
6111 }
6112}
6113
6114static irqreturn_t ibmvnic_interrupt(int irq, void *instance)
6115{
6116 struct ibmvnic_adapter *adapter = instance;
6117
6118 tasklet_schedule(&adapter->tasklet);
6119 return IRQ_HANDLED;
6120}
6121
6122static void ibmvnic_tasklet(struct tasklet_struct *t)
6123{
6124 struct ibmvnic_adapter *adapter = from_tasklet(adapter, t, tasklet);
6125 struct ibmvnic_crq_queue *queue = &adapter->crq;
6126 union ibmvnic_crq *crq;
6127 unsigned long flags;
6128
6129 spin_lock_irqsave(&queue->lock, flags);
6130
6131 /* Pull all the valid messages off the CRQ */
6132 while ((crq = ibmvnic_next_crq(adapter)) != NULL) {
6133 /* This barrier makes sure ibmvnic_next_crq()'s
6134 * crq->generic.first & IBMVNIC_CRQ_CMD_RSP is loaded
6135 * before ibmvnic_handle_crq()'s
6136 * switch(gen_crq->first) and switch(gen_crq->cmd).
6137 */
6138 dma_rmb();
6139 ibmvnic_handle_crq(crq, adapter);
6140 crq->generic.first = 0;
6141 }
6142
6143 spin_unlock_irqrestore(&queue->lock, flags);
6144}
6145
6146static int ibmvnic_reenable_crq_queue(struct ibmvnic_adapter *adapter)
6147{
6148 struct vio_dev *vdev = adapter->vdev;
6149 int rc;
6150
6151 do {
6152 rc = plpar_hcall_norets(H_ENABLE_CRQ, vdev->unit_address);
6153 } while (rc == H_IN_PROGRESS || rc == H_BUSY || H_IS_LONG_BUSY(rc));
6154
6155 if (rc)
6156 dev_err(&vdev->dev, "Error enabling adapter (rc=%d)\n", rc);
6157
6158 return rc;
6159}
6160
6161static int ibmvnic_reset_crq(struct ibmvnic_adapter *adapter)
6162{
6163 struct ibmvnic_crq_queue *crq = &adapter->crq;
6164 struct device *dev = &adapter->vdev->dev;
6165 struct vio_dev *vdev = adapter->vdev;
6166 int rc;
6167
6168 /* Close the CRQ */
6169 do {
6170 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
6171 } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
6172
6173 /* Clean out the queue */
6174 if (!crq->msgs)
6175 return -EINVAL;
6176
6177 memset(crq->msgs, 0, PAGE_SIZE);
6178 crq->cur = 0;
6179 crq->active = false;
6180
6181 /* And re-open it again */
6182 rc = plpar_hcall_norets(H_REG_CRQ, vdev->unit_address,
6183 crq->msg_token, PAGE_SIZE);
6184
6185 if (rc == H_CLOSED)
6186 /* Adapter is good, but other end is not ready */
6187 dev_warn(dev, "Partner adapter not ready\n");
6188 else if (rc != 0)
6189 dev_warn(dev, "Couldn't register crq (rc=%d)\n", rc);
6190
6191 return rc;
6192}
6193
6194static void release_crq_queue(struct ibmvnic_adapter *adapter)
6195{
6196 struct ibmvnic_crq_queue *crq = &adapter->crq;
6197 struct vio_dev *vdev = adapter->vdev;
6198 long rc;
6199
6200 if (!crq->msgs)
6201 return;
6202
6203 netdev_dbg(adapter->netdev, "Releasing CRQ\n");
6204 free_irq(vdev->irq, adapter);
6205 tasklet_kill(&adapter->tasklet);
6206 do {
6207 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
6208 } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
6209
6210 dma_unmap_single(&vdev->dev, crq->msg_token, PAGE_SIZE,
6211 DMA_BIDIRECTIONAL);
6212 free_page((unsigned long)crq->msgs);
6213 crq->msgs = NULL;
6214 crq->active = false;
6215}
6216
6217static int init_crq_queue(struct ibmvnic_adapter *adapter)
6218{
6219 struct ibmvnic_crq_queue *crq = &adapter->crq;
6220 struct device *dev = &adapter->vdev->dev;
6221 struct vio_dev *vdev = adapter->vdev;
6222 int rc, retrc = -ENOMEM;
6223
6224 if (crq->msgs)
6225 return 0;
6226
6227 crq->msgs = (union ibmvnic_crq *)get_zeroed_page(GFP_KERNEL);
6228 /* Should we allocate more than one page? */
6229
6230 if (!crq->msgs)
6231 return -ENOMEM;
6232
6233 crq->size = PAGE_SIZE / sizeof(*crq->msgs);
6234 crq->msg_token = dma_map_single(dev, crq->msgs, PAGE_SIZE,
6235 DMA_BIDIRECTIONAL);
6236 if (dma_mapping_error(dev, crq->msg_token))
6237 goto map_failed;
6238
6239 rc = plpar_hcall_norets(H_REG_CRQ, vdev->unit_address,
6240 crq->msg_token, PAGE_SIZE);
6241
6242 if (rc == H_RESOURCE)
6243 /* maybe kexecing and resource is busy. try a reset */
6244 rc = ibmvnic_reset_crq(adapter);
6245 retrc = rc;
6246
6247 if (rc == H_CLOSED) {
6248 dev_warn(dev, "Partner adapter not ready\n");
6249 } else if (rc) {
6250 dev_warn(dev, "Error %d opening adapter\n", rc);
6251 goto reg_crq_failed;
6252 }
6253
6254 retrc = 0;
6255
6256 tasklet_setup(&adapter->tasklet, (void *)ibmvnic_tasklet);
6257
6258 netdev_dbg(adapter->netdev, "registering irq 0x%x\n", vdev->irq);
6259 snprintf(crq->name, sizeof(crq->name), "ibmvnic-%x",
6260 adapter->vdev->unit_address);
6261 rc = request_irq(vdev->irq, ibmvnic_interrupt, 0, crq->name, adapter);
6262 if (rc) {
6263 dev_err(dev, "Couldn't register irq 0x%x. rc=%d\n",
6264 vdev->irq, rc);
6265 goto req_irq_failed;
6266 }
6267
6268 rc = vio_enable_interrupts(vdev);
6269 if (rc) {
6270 dev_err(dev, "Error %d enabling interrupts\n", rc);
6271 goto req_irq_failed;
6272 }
6273
6274 crq->cur = 0;
6275 spin_lock_init(&crq->lock);
6276
6277 /* process any CRQs that were queued before we enabled interrupts */
6278 tasklet_schedule(&adapter->tasklet);
6279
6280 return retrc;
6281
6282req_irq_failed:
6283 tasklet_kill(&adapter->tasklet);
6284 do {
6285 rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
6286 } while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
6287reg_crq_failed:
6288 dma_unmap_single(dev, crq->msg_token, PAGE_SIZE, DMA_BIDIRECTIONAL);
6289map_failed:
6290 free_page((unsigned long)crq->msgs);
6291 crq->msgs = NULL;
6292 return retrc;
6293}
6294
6295static int ibmvnic_reset_init(struct ibmvnic_adapter *adapter, bool reset)
6296{
6297 struct device *dev = &adapter->vdev->dev;
6298 unsigned long timeout = msecs_to_jiffies(20000);
6299 u64 old_num_rx_queues = adapter->req_rx_queues;
6300 u64 old_num_tx_queues = adapter->req_tx_queues;
6301 int rc;
6302
6303 adapter->from_passive_init = false;
6304
6305 rc = ibmvnic_send_crq_init(adapter);
6306 if (rc) {
6307 dev_err(dev, "Send crq init failed with error %d\n", rc);
6308 return rc;
6309 }
6310
6311 if (!wait_for_completion_timeout(&adapter->init_done, timeout)) {
6312 dev_err(dev, "Initialization sequence timed out\n");
6313 return -ETIMEDOUT;
6314 }
6315
6316 if (adapter->init_done_rc) {
6317 release_crq_queue(adapter);
6318 dev_err(dev, "CRQ-init failed, %d\n", adapter->init_done_rc);
6319 return adapter->init_done_rc;
6320 }
6321
6322 if (adapter->from_passive_init) {
6323 adapter->state = VNIC_OPEN;
6324 adapter->from_passive_init = false;
6325 dev_err(dev, "CRQ-init failed, passive-init\n");
6326 return -EINVAL;
6327 }
6328
6329 if (reset &&
6330 test_bit(0, &adapter->resetting) && !adapter->wait_for_reset &&
6331 adapter->reset_reason != VNIC_RESET_MOBILITY) {
6332 if (adapter->req_rx_queues != old_num_rx_queues ||
6333 adapter->req_tx_queues != old_num_tx_queues) {
6334 release_sub_crqs(adapter, 0);
6335 rc = init_sub_crqs(adapter);
6336 } else {
6337 /* no need to reinitialize completely, but we do
6338 * need to clean up transmits that were in flight
6339 * when we processed the reset. Failure to do so
6340 * will confound the upper layer, usually TCP, by
6341 * creating the illusion of transmits that are
6342 * awaiting completion.
6343 */
6344 clean_tx_pools(adapter);
6345
6346 rc = reset_sub_crq_queues(adapter);
6347 }
6348 } else {
6349 rc = init_sub_crqs(adapter);
6350 }
6351
6352 if (rc) {
6353 dev_err(dev, "Initialization of sub crqs failed\n");
6354 release_crq_queue(adapter);
6355 return rc;
6356 }
6357
6358 rc = init_sub_crq_irqs(adapter);
6359 if (rc) {
6360 dev_err(dev, "Failed to initialize sub crq irqs\n");
6361 release_crq_queue(adapter);
6362 }
6363
6364 return rc;
6365}
6366
6367static struct device_attribute dev_attr_failover;
6368
6369static int ibmvnic_probe(struct vio_dev *dev, const struct vio_device_id *id)
6370{
6371 struct ibmvnic_adapter *adapter;
6372 struct net_device *netdev;
6373 unsigned char *mac_addr_p;
6374 unsigned long flags;
6375 bool init_success;
6376 int rc;
6377
6378 dev_dbg(&dev->dev, "entering ibmvnic_probe for UA 0x%x\n",
6379 dev->unit_address);
6380
6381 mac_addr_p = (unsigned char *)vio_get_attribute(dev,
6382 VETH_MAC_ADDR, NULL);
6383 if (!mac_addr_p) {
6384 dev_err(&dev->dev,
6385 "(%s:%3.3d) ERROR: Can't find MAC_ADDR attribute\n",
6386 __FILE__, __LINE__);
6387 return 0;
6388 }
6389
6390 netdev = alloc_etherdev_mq(sizeof(struct ibmvnic_adapter),
6391 IBMVNIC_MAX_QUEUES);
6392 if (!netdev)
6393 return -ENOMEM;
6394
6395 adapter = netdev_priv(netdev);
6396 adapter->state = VNIC_PROBING;
6397 dev_set_drvdata(&dev->dev, netdev);
6398 adapter->vdev = dev;
6399 adapter->netdev = netdev;
6400 adapter->login_pending = false;
6401 memset(&adapter->map_ids, 0, sizeof(adapter->map_ids));
6402 /* map_ids start at 1, so ensure map_id 0 is always "in-use" */
6403 bitmap_set(adapter->map_ids, 0, 1);
6404
6405 ether_addr_copy(adapter->mac_addr, mac_addr_p);
6406 eth_hw_addr_set(netdev, adapter->mac_addr);
6407 netdev->irq = dev->irq;
6408 netdev->netdev_ops = &ibmvnic_netdev_ops;
6409 netdev->ethtool_ops = &ibmvnic_ethtool_ops;
6410 SET_NETDEV_DEV(netdev, &dev->dev);
6411
6412 INIT_WORK(&adapter->ibmvnic_reset, __ibmvnic_reset);
6413 INIT_DELAYED_WORK(&adapter->ibmvnic_delayed_reset,
6414 __ibmvnic_delayed_reset);
6415 INIT_LIST_HEAD(&adapter->rwi_list);
6416 spin_lock_init(&adapter->rwi_lock);
6417 spin_lock_init(&adapter->state_lock);
6418 mutex_init(&adapter->fw_lock);
6419 init_completion(&adapter->probe_done);
6420 init_completion(&adapter->init_done);
6421 init_completion(&adapter->fw_done);
6422 init_completion(&adapter->reset_done);
6423 init_completion(&adapter->stats_done);
6424 clear_bit(0, &adapter->resetting);
6425 adapter->prev_rx_buf_sz = 0;
6426 adapter->prev_mtu = 0;
6427
6428 init_success = false;
6429 do {
6430 reinit_init_done(adapter);
6431
6432 /* clear any failovers we got in the previous pass
6433 * since we are reinitializing the CRQ
6434 */
6435 adapter->failover_pending = false;
6436
6437 /* If we had already initialized CRQ, we may have one or
6438 * more resets queued already. Discard those and release
6439 * the CRQ before initializing the CRQ again.
6440 */
6441 release_crq_queue(adapter);
6442
6443 /* Since we are still in PROBING state, __ibmvnic_reset()
6444 * will not access the ->rwi_list and since we released CRQ,
6445 * we won't get _new_ transport events. But there maybe an
6446 * ongoing ibmvnic_reset() call. So serialize access to
6447 * rwi_list. If we win the race, ibvmnic_reset() could add
6448 * a reset after we purged but thats ok - we just may end
6449 * up with an extra reset (i.e similar to having two or more
6450 * resets in the queue at once).
6451 * CHECK.
6452 */
6453 spin_lock_irqsave(&adapter->rwi_lock, flags);
6454 flush_reset_queue(adapter);
6455 spin_unlock_irqrestore(&adapter->rwi_lock, flags);
6456
6457 rc = init_crq_queue(adapter);
6458 if (rc) {
6459 dev_err(&dev->dev, "Couldn't initialize crq. rc=%d\n",
6460 rc);
6461 goto ibmvnic_init_fail;
6462 }
6463
6464 rc = ibmvnic_reset_init(adapter, false);
6465 } while (rc == -EAGAIN);
6466
6467 /* We are ignoring the error from ibmvnic_reset_init() assuming that the
6468 * partner is not ready. CRQ is not active. When the partner becomes
6469 * ready, we will do the passive init reset.
6470 */
6471
6472 if (!rc)
6473 init_success = true;
6474
6475 rc = init_stats_buffers(adapter);
6476 if (rc)
6477 goto ibmvnic_init_fail;
6478
6479 rc = init_stats_token(adapter);
6480 if (rc)
6481 goto ibmvnic_stats_fail;
6482
6483 rc = device_create_file(&dev->dev, &dev_attr_failover);
6484 if (rc)
6485 goto ibmvnic_dev_file_err;
6486
6487 netif_carrier_off(netdev);
6488
6489 if (init_success) {
6490 adapter->state = VNIC_PROBED;
6491 netdev->mtu = adapter->req_mtu - ETH_HLEN;
6492 netdev->min_mtu = adapter->min_mtu - ETH_HLEN;
6493 netdev->max_mtu = adapter->max_mtu - ETH_HLEN;
6494 } else {
6495 adapter->state = VNIC_DOWN;
6496 }
6497
6498 adapter->wait_for_reset = false;
6499 adapter->last_reset_time = jiffies;
6500
6501 rc = register_netdev(netdev);
6502 if (rc) {
6503 dev_err(&dev->dev, "failed to register netdev rc=%d\n", rc);
6504 goto ibmvnic_register_fail;
6505 }
6506 dev_info(&dev->dev, "ibmvnic registered\n");
6507
6508 rc = ibmvnic_cpu_notif_add(adapter);
6509 if (rc) {
6510 netdev_err(netdev, "Registering cpu notifier failed\n");
6511 goto cpu_notif_add_failed;
6512 }
6513
6514 complete(&adapter->probe_done);
6515
6516 return 0;
6517
6518cpu_notif_add_failed:
6519 unregister_netdev(netdev);
6520
6521ibmvnic_register_fail:
6522 device_remove_file(&dev->dev, &dev_attr_failover);
6523
6524ibmvnic_dev_file_err:
6525 release_stats_token(adapter);
6526
6527ibmvnic_stats_fail:
6528 release_stats_buffers(adapter);
6529
6530ibmvnic_init_fail:
6531 release_sub_crqs(adapter, 1);
6532 release_crq_queue(adapter);
6533
6534 /* cleanup worker thread after releasing CRQ so we don't get
6535 * transport events (i.e new work items for the worker thread).
6536 */
6537 adapter->state = VNIC_REMOVING;
6538 complete(&adapter->probe_done);
6539 flush_work(&adapter->ibmvnic_reset);
6540 flush_delayed_work(&adapter->ibmvnic_delayed_reset);
6541
6542 flush_reset_queue(adapter);
6543
6544 mutex_destroy(&adapter->fw_lock);
6545 free_netdev(netdev);
6546
6547 return rc;
6548}
6549
6550static void ibmvnic_remove(struct vio_dev *dev)
6551{
6552 struct net_device *netdev = dev_get_drvdata(&dev->dev);
6553 struct ibmvnic_adapter *adapter = netdev_priv(netdev);
6554 unsigned long flags;
6555
6556 spin_lock_irqsave(&adapter->state_lock, flags);
6557
6558 /* If ibmvnic_reset() is scheduling a reset, wait for it to
6559 * finish. Then, set the state to REMOVING to prevent it from
6560 * scheduling any more work and to have reset functions ignore
6561 * any resets that have already been scheduled. Drop the lock
6562 * after setting state, so __ibmvnic_reset() which is called
6563 * from the flush_work() below, can make progress.
6564 */
6565 spin_lock(&adapter->rwi_lock);
6566 adapter->state = VNIC_REMOVING;
6567 spin_unlock(&adapter->rwi_lock);
6568
6569 spin_unlock_irqrestore(&adapter->state_lock, flags);
6570
6571 ibmvnic_cpu_notif_remove(adapter);
6572
6573 flush_work(&adapter->ibmvnic_reset);
6574 flush_delayed_work(&adapter->ibmvnic_delayed_reset);
6575
6576 rtnl_lock();
6577 unregister_netdevice(netdev);
6578
6579 release_resources(adapter);
6580 release_rx_pools(adapter);
6581 release_tx_pools(adapter);
6582 release_sub_crqs(adapter, 1);
6583 release_crq_queue(adapter);
6584
6585 release_stats_token(adapter);
6586 release_stats_buffers(adapter);
6587
6588 adapter->state = VNIC_REMOVED;
6589
6590 rtnl_unlock();
6591 mutex_destroy(&adapter->fw_lock);
6592 device_remove_file(&dev->dev, &dev_attr_failover);
6593 free_netdev(netdev);
6594 dev_set_drvdata(&dev->dev, NULL);
6595}
6596
6597static ssize_t failover_store(struct device *dev, struct device_attribute *attr,
6598 const char *buf, size_t count)
6599{
6600 struct net_device *netdev = dev_get_drvdata(dev);
6601 struct ibmvnic_adapter *adapter = netdev_priv(netdev);
6602 unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
6603 __be64 session_token;
6604 long rc;
6605
6606 if (!sysfs_streq(buf, "1"))
6607 return -EINVAL;
6608
6609 rc = plpar_hcall(H_VIOCTL, retbuf, adapter->vdev->unit_address,
6610 H_GET_SESSION_TOKEN, 0, 0, 0);
6611 if (rc) {
6612 netdev_err(netdev, "Couldn't retrieve session token, rc %ld\n",
6613 rc);
6614 goto last_resort;
6615 }
6616
6617 session_token = (__be64)retbuf[0];
6618 netdev_dbg(netdev, "Initiating client failover, session id %llx\n",
6619 be64_to_cpu(session_token));
6620 rc = plpar_hcall_norets(H_VIOCTL, adapter->vdev->unit_address,
6621 H_SESSION_ERR_DETECTED, session_token, 0, 0);
6622 if (rc) {
6623 netdev_err(netdev,
6624 "H_VIOCTL initiated failover failed, rc %ld\n",
6625 rc);
6626 goto last_resort;
6627 }
6628
6629 return count;
6630
6631last_resort:
6632 netdev_dbg(netdev, "Trying to send CRQ_CMD, the last resort\n");
6633 ibmvnic_reset(adapter, VNIC_RESET_FAILOVER);
6634
6635 return count;
6636}
6637static DEVICE_ATTR_WO(failover);
6638
6639static unsigned long ibmvnic_get_desired_dma(struct vio_dev *vdev)
6640{
6641 struct net_device *netdev = dev_get_drvdata(&vdev->dev);
6642 struct ibmvnic_adapter *adapter;
6643 struct iommu_table *tbl;
6644 unsigned long ret = 0;
6645 int i;
6646
6647 tbl = get_iommu_table_base(&vdev->dev);
6648
6649 /* netdev inits at probe time along with the structures we need below*/
6650 if (!netdev)
6651 return IOMMU_PAGE_ALIGN(IBMVNIC_IO_ENTITLEMENT_DEFAULT, tbl);
6652
6653 adapter = netdev_priv(netdev);
6654
6655 ret += PAGE_SIZE; /* the crq message queue */
6656 ret += IOMMU_PAGE_ALIGN(sizeof(struct ibmvnic_statistics), tbl);
6657
6658 for (i = 0; i < adapter->req_tx_queues + adapter->req_rx_queues; i++)
6659 ret += 4 * PAGE_SIZE; /* the scrq message queue */
6660
6661 for (i = 0; i < adapter->num_active_rx_pools; i++)
6662 ret += adapter->rx_pool[i].size *
6663 IOMMU_PAGE_ALIGN(adapter->rx_pool[i].buff_size, tbl);
6664
6665 return ret;
6666}
6667
6668static int ibmvnic_resume(struct device *dev)
6669{
6670 struct net_device *netdev = dev_get_drvdata(dev);
6671 struct ibmvnic_adapter *adapter = netdev_priv(netdev);
6672
6673 if (adapter->state != VNIC_OPEN)
6674 return 0;
6675
6676 tasklet_schedule(&adapter->tasklet);
6677
6678 return 0;
6679}
6680
6681static const struct vio_device_id ibmvnic_device_table[] = {
6682 {"network", "IBM,vnic"},
6683 {"", "" }
6684};
6685MODULE_DEVICE_TABLE(vio, ibmvnic_device_table);
6686
6687static const struct dev_pm_ops ibmvnic_pm_ops = {
6688 .resume = ibmvnic_resume
6689};
6690
6691static struct vio_driver ibmvnic_driver = {
6692 .id_table = ibmvnic_device_table,
6693 .probe = ibmvnic_probe,
6694 .remove = ibmvnic_remove,
6695 .get_desired_dma = ibmvnic_get_desired_dma,
6696 .name = ibmvnic_driver_name,
6697 .pm = &ibmvnic_pm_ops,
6698};
6699
6700/* module functions */
6701static int __init ibmvnic_module_init(void)
6702{
6703 int ret;
6704
6705 ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "net/ibmvnic:online",
6706 ibmvnic_cpu_online,
6707 ibmvnic_cpu_down_prep);
6708 if (ret < 0)
6709 goto out;
6710 ibmvnic_online = ret;
6711 ret = cpuhp_setup_state_multi(CPUHP_IBMVNIC_DEAD, "net/ibmvnic:dead",
6712 NULL, ibmvnic_cpu_dead);
6713 if (ret)
6714 goto err_dead;
6715
6716 ret = vio_register_driver(&ibmvnic_driver);
6717 if (ret)
6718 goto err_vio_register;
6719
6720 pr_info("%s: %s %s\n", ibmvnic_driver_name, ibmvnic_driver_string,
6721 IBMVNIC_DRIVER_VERSION);
6722
6723 return 0;
6724err_vio_register:
6725 cpuhp_remove_multi_state(CPUHP_IBMVNIC_DEAD);
6726err_dead:
6727 cpuhp_remove_multi_state(ibmvnic_online);
6728out:
6729 return ret;
6730}
6731
6732static void __exit ibmvnic_module_exit(void)
6733{
6734 vio_unregister_driver(&ibmvnic_driver);
6735 cpuhp_remove_multi_state(CPUHP_IBMVNIC_DEAD);
6736 cpuhp_remove_multi_state(ibmvnic_online);
6737}
6738
6739module_init(ibmvnic_module_init);
6740module_exit(ibmvnic_module_exit);