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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * IBM Power Virtual Ethernet Device Driver
4 *
5 * Copyright (C) IBM Corporation, 2003, 2010
6 *
7 * Authors: Dave Larson <larson1@us.ibm.com>
8 * Santiago Leon <santil@linux.vnet.ibm.com>
9 * Brian King <brking@linux.vnet.ibm.com>
10 * Robert Jennings <rcj@linux.vnet.ibm.com>
11 * Anton Blanchard <anton@au.ibm.com>
12 */
13
14#include <linux/module.h>
15#include <linux/types.h>
16#include <linux/errno.h>
17#include <linux/dma-mapping.h>
18#include <linux/kernel.h>
19#include <linux/netdevice.h>
20#include <linux/etherdevice.h>
21#include <linux/skbuff.h>
22#include <linux/init.h>
23#include <linux/interrupt.h>
24#include <linux/mm.h>
25#include <linux/pm.h>
26#include <linux/ethtool.h>
27#include <linux/in.h>
28#include <linux/ip.h>
29#include <linux/ipv6.h>
30#include <linux/slab.h>
31#include <asm/hvcall.h>
32#include <linux/atomic.h>
33#include <asm/vio.h>
34#include <asm/iommu.h>
35#include <asm/firmware.h>
36#include <net/tcp.h>
37#include <net/ip6_checksum.h>
38
39#include "ibmveth.h"
40
41static irqreturn_t ibmveth_interrupt(int irq, void *dev_instance);
42static void ibmveth_rxq_harvest_buffer(struct ibmveth_adapter *adapter);
43static unsigned long ibmveth_get_desired_dma(struct vio_dev *vdev);
44
45static struct kobj_type ktype_veth_pool;
46
47
48static const char ibmveth_driver_name[] = "ibmveth";
49static const char ibmveth_driver_string[] = "IBM Power Virtual Ethernet Driver";
50#define ibmveth_driver_version "1.06"
51
52MODULE_AUTHOR("Santiago Leon <santil@linux.vnet.ibm.com>");
53MODULE_DESCRIPTION("IBM Power Virtual Ethernet Driver");
54MODULE_LICENSE("GPL");
55MODULE_VERSION(ibmveth_driver_version);
56
57static unsigned int tx_copybreak __read_mostly = 128;
58module_param(tx_copybreak, uint, 0644);
59MODULE_PARM_DESC(tx_copybreak,
60 "Maximum size of packet that is copied to a new buffer on transmit");
61
62static unsigned int rx_copybreak __read_mostly = 128;
63module_param(rx_copybreak, uint, 0644);
64MODULE_PARM_DESC(rx_copybreak,
65 "Maximum size of packet that is copied to a new buffer on receive");
66
67static unsigned int rx_flush __read_mostly = 0;
68module_param(rx_flush, uint, 0644);
69MODULE_PARM_DESC(rx_flush, "Flush receive buffers before use");
70
71static bool old_large_send __read_mostly;
72module_param(old_large_send, bool, 0444);
73MODULE_PARM_DESC(old_large_send,
74 "Use old large send method on firmware that supports the new method");
75
76struct ibmveth_stat {
77 char name[ETH_GSTRING_LEN];
78 int offset;
79};
80
81#define IBMVETH_STAT_OFF(stat) offsetof(struct ibmveth_adapter, stat)
82#define IBMVETH_GET_STAT(a, off) *((u64 *)(((unsigned long)(a)) + off))
83
84static struct ibmveth_stat ibmveth_stats[] = {
85 { "replenish_task_cycles", IBMVETH_STAT_OFF(replenish_task_cycles) },
86 { "replenish_no_mem", IBMVETH_STAT_OFF(replenish_no_mem) },
87 { "replenish_add_buff_failure",
88 IBMVETH_STAT_OFF(replenish_add_buff_failure) },
89 { "replenish_add_buff_success",
90 IBMVETH_STAT_OFF(replenish_add_buff_success) },
91 { "rx_invalid_buffer", IBMVETH_STAT_OFF(rx_invalid_buffer) },
92 { "rx_no_buffer", IBMVETH_STAT_OFF(rx_no_buffer) },
93 { "tx_map_failed", IBMVETH_STAT_OFF(tx_map_failed) },
94 { "tx_send_failed", IBMVETH_STAT_OFF(tx_send_failed) },
95 { "fw_enabled_ipv4_csum", IBMVETH_STAT_OFF(fw_ipv4_csum_support) },
96 { "fw_enabled_ipv6_csum", IBMVETH_STAT_OFF(fw_ipv6_csum_support) },
97 { "tx_large_packets", IBMVETH_STAT_OFF(tx_large_packets) },
98 { "rx_large_packets", IBMVETH_STAT_OFF(rx_large_packets) },
99 { "fw_enabled_large_send", IBMVETH_STAT_OFF(fw_large_send_support) }
100};
101
102/* simple methods of getting data from the current rxq entry */
103static inline u32 ibmveth_rxq_flags(struct ibmveth_adapter *adapter)
104{
105 return be32_to_cpu(adapter->rx_queue.queue_addr[adapter->rx_queue.index].flags_off);
106}
107
108static inline int ibmveth_rxq_toggle(struct ibmveth_adapter *adapter)
109{
110 return (ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_TOGGLE) >>
111 IBMVETH_RXQ_TOGGLE_SHIFT;
112}
113
114static inline int ibmveth_rxq_pending_buffer(struct ibmveth_adapter *adapter)
115{
116 return ibmveth_rxq_toggle(adapter) == adapter->rx_queue.toggle;
117}
118
119static inline int ibmveth_rxq_buffer_valid(struct ibmveth_adapter *adapter)
120{
121 return ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_VALID;
122}
123
124static inline int ibmveth_rxq_frame_offset(struct ibmveth_adapter *adapter)
125{
126 return ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_OFF_MASK;
127}
128
129static inline int ibmveth_rxq_large_packet(struct ibmveth_adapter *adapter)
130{
131 return ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_LRG_PKT;
132}
133
134static inline int ibmveth_rxq_frame_length(struct ibmveth_adapter *adapter)
135{
136 return be32_to_cpu(adapter->rx_queue.queue_addr[adapter->rx_queue.index].length);
137}
138
139static inline int ibmveth_rxq_csum_good(struct ibmveth_adapter *adapter)
140{
141 return ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_CSUM_GOOD;
142}
143
144/* setup the initial settings for a buffer pool */
145static void ibmveth_init_buffer_pool(struct ibmveth_buff_pool *pool,
146 u32 pool_index, u32 pool_size,
147 u32 buff_size, u32 pool_active)
148{
149 pool->size = pool_size;
150 pool->index = pool_index;
151 pool->buff_size = buff_size;
152 pool->threshold = pool_size * 7 / 8;
153 pool->active = pool_active;
154}
155
156/* allocate and setup an buffer pool - called during open */
157static int ibmveth_alloc_buffer_pool(struct ibmveth_buff_pool *pool)
158{
159 int i;
160
161 pool->free_map = kmalloc_array(pool->size, sizeof(u16), GFP_KERNEL);
162
163 if (!pool->free_map)
164 return -1;
165
166 pool->dma_addr = kcalloc(pool->size, sizeof(dma_addr_t), GFP_KERNEL);
167 if (!pool->dma_addr) {
168 kfree(pool->free_map);
169 pool->free_map = NULL;
170 return -1;
171 }
172
173 pool->skbuff = kcalloc(pool->size, sizeof(void *), GFP_KERNEL);
174
175 if (!pool->skbuff) {
176 kfree(pool->dma_addr);
177 pool->dma_addr = NULL;
178
179 kfree(pool->free_map);
180 pool->free_map = NULL;
181 return -1;
182 }
183
184 for (i = 0; i < pool->size; ++i)
185 pool->free_map[i] = i;
186
187 atomic_set(&pool->available, 0);
188 pool->producer_index = 0;
189 pool->consumer_index = 0;
190
191 return 0;
192}
193
194static inline void ibmveth_flush_buffer(void *addr, unsigned long length)
195{
196 unsigned long offset;
197
198 for (offset = 0; offset < length; offset += SMP_CACHE_BYTES)
199 asm("dcbfl %0,%1" :: "b" (addr), "r" (offset));
200}
201
202/* replenish the buffers for a pool. note that we don't need to
203 * skb_reserve these since they are used for incoming...
204 */
205static void ibmveth_replenish_buffer_pool(struct ibmveth_adapter *adapter,
206 struct ibmveth_buff_pool *pool)
207{
208 u32 i;
209 u32 count = pool->size - atomic_read(&pool->available);
210 u32 buffers_added = 0;
211 struct sk_buff *skb;
212 unsigned int free_index, index;
213 u64 correlator;
214 unsigned long lpar_rc;
215 dma_addr_t dma_addr;
216
217 mb();
218
219 for (i = 0; i < count; ++i) {
220 union ibmveth_buf_desc desc;
221
222 skb = netdev_alloc_skb(adapter->netdev, pool->buff_size);
223
224 if (!skb) {
225 netdev_dbg(adapter->netdev,
226 "replenish: unable to allocate skb\n");
227 adapter->replenish_no_mem++;
228 break;
229 }
230
231 free_index = pool->consumer_index;
232 pool->consumer_index++;
233 if (pool->consumer_index >= pool->size)
234 pool->consumer_index = 0;
235 index = pool->free_map[free_index];
236
237 BUG_ON(index == IBM_VETH_INVALID_MAP);
238 BUG_ON(pool->skbuff[index] != NULL);
239
240 dma_addr = dma_map_single(&adapter->vdev->dev, skb->data,
241 pool->buff_size, DMA_FROM_DEVICE);
242
243 if (dma_mapping_error(&adapter->vdev->dev, dma_addr))
244 goto failure;
245
246 pool->free_map[free_index] = IBM_VETH_INVALID_MAP;
247 pool->dma_addr[index] = dma_addr;
248 pool->skbuff[index] = skb;
249
250 correlator = ((u64)pool->index << 32) | index;
251 *(u64 *)skb->data = correlator;
252
253 desc.fields.flags_len = IBMVETH_BUF_VALID | pool->buff_size;
254 desc.fields.address = dma_addr;
255
256 if (rx_flush) {
257 unsigned int len = min(pool->buff_size,
258 adapter->netdev->mtu +
259 IBMVETH_BUFF_OH);
260 ibmveth_flush_buffer(skb->data, len);
261 }
262 lpar_rc = h_add_logical_lan_buffer(adapter->vdev->unit_address,
263 desc.desc);
264
265 if (lpar_rc != H_SUCCESS) {
266 goto failure;
267 } else {
268 buffers_added++;
269 adapter->replenish_add_buff_success++;
270 }
271 }
272
273 mb();
274 atomic_add(buffers_added, &(pool->available));
275 return;
276
277failure:
278 pool->free_map[free_index] = index;
279 pool->skbuff[index] = NULL;
280 if (pool->consumer_index == 0)
281 pool->consumer_index = pool->size - 1;
282 else
283 pool->consumer_index--;
284 if (!dma_mapping_error(&adapter->vdev->dev, dma_addr))
285 dma_unmap_single(&adapter->vdev->dev,
286 pool->dma_addr[index], pool->buff_size,
287 DMA_FROM_DEVICE);
288 dev_kfree_skb_any(skb);
289 adapter->replenish_add_buff_failure++;
290
291 mb();
292 atomic_add(buffers_added, &(pool->available));
293}
294
295/*
296 * The final 8 bytes of the buffer list is a counter of frames dropped
297 * because there was not a buffer in the buffer list capable of holding
298 * the frame.
299 */
300static void ibmveth_update_rx_no_buffer(struct ibmveth_adapter *adapter)
301{
302 __be64 *p = adapter->buffer_list_addr + 4096 - 8;
303
304 adapter->rx_no_buffer = be64_to_cpup(p);
305}
306
307/* replenish routine */
308static void ibmveth_replenish_task(struct ibmveth_adapter *adapter)
309{
310 int i;
311
312 adapter->replenish_task_cycles++;
313
314 for (i = (IBMVETH_NUM_BUFF_POOLS - 1); i >= 0; i--) {
315 struct ibmveth_buff_pool *pool = &adapter->rx_buff_pool[i];
316
317 if (pool->active &&
318 (atomic_read(&pool->available) < pool->threshold))
319 ibmveth_replenish_buffer_pool(adapter, pool);
320 }
321
322 ibmveth_update_rx_no_buffer(adapter);
323}
324
325/* empty and free ana buffer pool - also used to do cleanup in error paths */
326static void ibmveth_free_buffer_pool(struct ibmveth_adapter *adapter,
327 struct ibmveth_buff_pool *pool)
328{
329 int i;
330
331 kfree(pool->free_map);
332 pool->free_map = NULL;
333
334 if (pool->skbuff && pool->dma_addr) {
335 for (i = 0; i < pool->size; ++i) {
336 struct sk_buff *skb = pool->skbuff[i];
337 if (skb) {
338 dma_unmap_single(&adapter->vdev->dev,
339 pool->dma_addr[i],
340 pool->buff_size,
341 DMA_FROM_DEVICE);
342 dev_kfree_skb_any(skb);
343 pool->skbuff[i] = NULL;
344 }
345 }
346 }
347
348 if (pool->dma_addr) {
349 kfree(pool->dma_addr);
350 pool->dma_addr = NULL;
351 }
352
353 if (pool->skbuff) {
354 kfree(pool->skbuff);
355 pool->skbuff = NULL;
356 }
357}
358
359/* remove a buffer from a pool */
360static void ibmveth_remove_buffer_from_pool(struct ibmveth_adapter *adapter,
361 u64 correlator)
362{
363 unsigned int pool = correlator >> 32;
364 unsigned int index = correlator & 0xffffffffUL;
365 unsigned int free_index;
366 struct sk_buff *skb;
367
368 BUG_ON(pool >= IBMVETH_NUM_BUFF_POOLS);
369 BUG_ON(index >= adapter->rx_buff_pool[pool].size);
370
371 skb = adapter->rx_buff_pool[pool].skbuff[index];
372
373 BUG_ON(skb == NULL);
374
375 adapter->rx_buff_pool[pool].skbuff[index] = NULL;
376
377 dma_unmap_single(&adapter->vdev->dev,
378 adapter->rx_buff_pool[pool].dma_addr[index],
379 adapter->rx_buff_pool[pool].buff_size,
380 DMA_FROM_DEVICE);
381
382 free_index = adapter->rx_buff_pool[pool].producer_index;
383 adapter->rx_buff_pool[pool].producer_index++;
384 if (adapter->rx_buff_pool[pool].producer_index >=
385 adapter->rx_buff_pool[pool].size)
386 adapter->rx_buff_pool[pool].producer_index = 0;
387 adapter->rx_buff_pool[pool].free_map[free_index] = index;
388
389 mb();
390
391 atomic_dec(&(adapter->rx_buff_pool[pool].available));
392}
393
394/* get the current buffer on the rx queue */
395static inline struct sk_buff *ibmveth_rxq_get_buffer(struct ibmveth_adapter *adapter)
396{
397 u64 correlator = adapter->rx_queue.queue_addr[adapter->rx_queue.index].correlator;
398 unsigned int pool = correlator >> 32;
399 unsigned int index = correlator & 0xffffffffUL;
400
401 BUG_ON(pool >= IBMVETH_NUM_BUFF_POOLS);
402 BUG_ON(index >= adapter->rx_buff_pool[pool].size);
403
404 return adapter->rx_buff_pool[pool].skbuff[index];
405}
406
407/* recycle the current buffer on the rx queue */
408static int ibmveth_rxq_recycle_buffer(struct ibmveth_adapter *adapter)
409{
410 u32 q_index = adapter->rx_queue.index;
411 u64 correlator = adapter->rx_queue.queue_addr[q_index].correlator;
412 unsigned int pool = correlator >> 32;
413 unsigned int index = correlator & 0xffffffffUL;
414 union ibmveth_buf_desc desc;
415 unsigned long lpar_rc;
416 int ret = 1;
417
418 BUG_ON(pool >= IBMVETH_NUM_BUFF_POOLS);
419 BUG_ON(index >= adapter->rx_buff_pool[pool].size);
420
421 if (!adapter->rx_buff_pool[pool].active) {
422 ibmveth_rxq_harvest_buffer(adapter);
423 ibmveth_free_buffer_pool(adapter, &adapter->rx_buff_pool[pool]);
424 goto out;
425 }
426
427 desc.fields.flags_len = IBMVETH_BUF_VALID |
428 adapter->rx_buff_pool[pool].buff_size;
429 desc.fields.address = adapter->rx_buff_pool[pool].dma_addr[index];
430
431 lpar_rc = h_add_logical_lan_buffer(adapter->vdev->unit_address, desc.desc);
432
433 if (lpar_rc != H_SUCCESS) {
434 netdev_dbg(adapter->netdev, "h_add_logical_lan_buffer failed "
435 "during recycle rc=%ld", lpar_rc);
436 ibmveth_remove_buffer_from_pool(adapter, adapter->rx_queue.queue_addr[adapter->rx_queue.index].correlator);
437 ret = 0;
438 }
439
440 if (++adapter->rx_queue.index == adapter->rx_queue.num_slots) {
441 adapter->rx_queue.index = 0;
442 adapter->rx_queue.toggle = !adapter->rx_queue.toggle;
443 }
444
445out:
446 return ret;
447}
448
449static void ibmveth_rxq_harvest_buffer(struct ibmveth_adapter *adapter)
450{
451 ibmveth_remove_buffer_from_pool(adapter, adapter->rx_queue.queue_addr[adapter->rx_queue.index].correlator);
452
453 if (++adapter->rx_queue.index == adapter->rx_queue.num_slots) {
454 adapter->rx_queue.index = 0;
455 adapter->rx_queue.toggle = !adapter->rx_queue.toggle;
456 }
457}
458
459static int ibmveth_register_logical_lan(struct ibmveth_adapter *adapter,
460 union ibmveth_buf_desc rxq_desc, u64 mac_address)
461{
462 int rc, try_again = 1;
463
464 /*
465 * After a kexec the adapter will still be open, so our attempt to
466 * open it will fail. So if we get a failure we free the adapter and
467 * try again, but only once.
468 */
469retry:
470 rc = h_register_logical_lan(adapter->vdev->unit_address,
471 adapter->buffer_list_dma, rxq_desc.desc,
472 adapter->filter_list_dma, mac_address);
473
474 if (rc != H_SUCCESS && try_again) {
475 do {
476 rc = h_free_logical_lan(adapter->vdev->unit_address);
477 } while (H_IS_LONG_BUSY(rc) || (rc == H_BUSY));
478
479 try_again = 0;
480 goto retry;
481 }
482
483 return rc;
484}
485
486static u64 ibmveth_encode_mac_addr(u8 *mac)
487{
488 int i;
489 u64 encoded = 0;
490
491 for (i = 0; i < ETH_ALEN; i++)
492 encoded = (encoded << 8) | mac[i];
493
494 return encoded;
495}
496
497static int ibmveth_open(struct net_device *netdev)
498{
499 struct ibmveth_adapter *adapter = netdev_priv(netdev);
500 u64 mac_address;
501 int rxq_entries = 1;
502 unsigned long lpar_rc;
503 int rc;
504 union ibmveth_buf_desc rxq_desc;
505 int i;
506 struct device *dev;
507
508 netdev_dbg(netdev, "open starting\n");
509
510 napi_enable(&adapter->napi);
511
512 for(i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
513 rxq_entries += adapter->rx_buff_pool[i].size;
514
515 rc = -ENOMEM;
516 adapter->buffer_list_addr = (void*) get_zeroed_page(GFP_KERNEL);
517 if (!adapter->buffer_list_addr) {
518 netdev_err(netdev, "unable to allocate list pages\n");
519 goto out;
520 }
521
522 adapter->filter_list_addr = (void*) get_zeroed_page(GFP_KERNEL);
523 if (!adapter->filter_list_addr) {
524 netdev_err(netdev, "unable to allocate filter pages\n");
525 goto out_free_buffer_list;
526 }
527
528 dev = &adapter->vdev->dev;
529
530 adapter->rx_queue.queue_len = sizeof(struct ibmveth_rx_q_entry) *
531 rxq_entries;
532 adapter->rx_queue.queue_addr =
533 dma_alloc_coherent(dev, adapter->rx_queue.queue_len,
534 &adapter->rx_queue.queue_dma, GFP_KERNEL);
535 if (!adapter->rx_queue.queue_addr)
536 goto out_free_filter_list;
537
538 adapter->buffer_list_dma = dma_map_single(dev,
539 adapter->buffer_list_addr, 4096, DMA_BIDIRECTIONAL);
540 if (dma_mapping_error(dev, adapter->buffer_list_dma)) {
541 netdev_err(netdev, "unable to map buffer list pages\n");
542 goto out_free_queue_mem;
543 }
544
545 adapter->filter_list_dma = dma_map_single(dev,
546 adapter->filter_list_addr, 4096, DMA_BIDIRECTIONAL);
547 if (dma_mapping_error(dev, adapter->filter_list_dma)) {
548 netdev_err(netdev, "unable to map filter list pages\n");
549 goto out_unmap_buffer_list;
550 }
551
552 adapter->rx_queue.index = 0;
553 adapter->rx_queue.num_slots = rxq_entries;
554 adapter->rx_queue.toggle = 1;
555
556 mac_address = ibmveth_encode_mac_addr(netdev->dev_addr);
557
558 rxq_desc.fields.flags_len = IBMVETH_BUF_VALID |
559 adapter->rx_queue.queue_len;
560 rxq_desc.fields.address = adapter->rx_queue.queue_dma;
561
562 netdev_dbg(netdev, "buffer list @ 0x%p\n", adapter->buffer_list_addr);
563 netdev_dbg(netdev, "filter list @ 0x%p\n", adapter->filter_list_addr);
564 netdev_dbg(netdev, "receive q @ 0x%p\n", adapter->rx_queue.queue_addr);
565
566 h_vio_signal(adapter->vdev->unit_address, VIO_IRQ_DISABLE);
567
568 lpar_rc = ibmveth_register_logical_lan(adapter, rxq_desc, mac_address);
569
570 if (lpar_rc != H_SUCCESS) {
571 netdev_err(netdev, "h_register_logical_lan failed with %ld\n",
572 lpar_rc);
573 netdev_err(netdev, "buffer TCE:0x%llx filter TCE:0x%llx rxq "
574 "desc:0x%llx MAC:0x%llx\n",
575 adapter->buffer_list_dma,
576 adapter->filter_list_dma,
577 rxq_desc.desc,
578 mac_address);
579 rc = -ENONET;
580 goto out_unmap_filter_list;
581 }
582
583 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
584 if (!adapter->rx_buff_pool[i].active)
585 continue;
586 if (ibmveth_alloc_buffer_pool(&adapter->rx_buff_pool[i])) {
587 netdev_err(netdev, "unable to alloc pool\n");
588 adapter->rx_buff_pool[i].active = 0;
589 rc = -ENOMEM;
590 goto out_free_buffer_pools;
591 }
592 }
593
594 netdev_dbg(netdev, "registering irq 0x%x\n", netdev->irq);
595 rc = request_irq(netdev->irq, ibmveth_interrupt, 0, netdev->name,
596 netdev);
597 if (rc != 0) {
598 netdev_err(netdev, "unable to request irq 0x%x, rc %d\n",
599 netdev->irq, rc);
600 do {
601 lpar_rc = h_free_logical_lan(adapter->vdev->unit_address);
602 } while (H_IS_LONG_BUSY(lpar_rc) || (lpar_rc == H_BUSY));
603
604 goto out_free_buffer_pools;
605 }
606
607 rc = -ENOMEM;
608 adapter->bounce_buffer =
609 kmalloc(netdev->mtu + IBMVETH_BUFF_OH, GFP_KERNEL);
610 if (!adapter->bounce_buffer)
611 goto out_free_irq;
612
613 adapter->bounce_buffer_dma =
614 dma_map_single(&adapter->vdev->dev, adapter->bounce_buffer,
615 netdev->mtu + IBMVETH_BUFF_OH, DMA_BIDIRECTIONAL);
616 if (dma_mapping_error(dev, adapter->bounce_buffer_dma)) {
617 netdev_err(netdev, "unable to map bounce buffer\n");
618 goto out_free_bounce_buffer;
619 }
620
621 netdev_dbg(netdev, "initial replenish cycle\n");
622 ibmveth_interrupt(netdev->irq, netdev);
623
624 netif_start_queue(netdev);
625
626 netdev_dbg(netdev, "open complete\n");
627
628 return 0;
629
630out_free_bounce_buffer:
631 kfree(adapter->bounce_buffer);
632out_free_irq:
633 free_irq(netdev->irq, netdev);
634out_free_buffer_pools:
635 while (--i >= 0) {
636 if (adapter->rx_buff_pool[i].active)
637 ibmveth_free_buffer_pool(adapter,
638 &adapter->rx_buff_pool[i]);
639 }
640out_unmap_filter_list:
641 dma_unmap_single(dev, adapter->filter_list_dma, 4096,
642 DMA_BIDIRECTIONAL);
643out_unmap_buffer_list:
644 dma_unmap_single(dev, adapter->buffer_list_dma, 4096,
645 DMA_BIDIRECTIONAL);
646out_free_queue_mem:
647 dma_free_coherent(dev, adapter->rx_queue.queue_len,
648 adapter->rx_queue.queue_addr,
649 adapter->rx_queue.queue_dma);
650out_free_filter_list:
651 free_page((unsigned long)adapter->filter_list_addr);
652out_free_buffer_list:
653 free_page((unsigned long)adapter->buffer_list_addr);
654out:
655 napi_disable(&adapter->napi);
656 return rc;
657}
658
659static int ibmveth_close(struct net_device *netdev)
660{
661 struct ibmveth_adapter *adapter = netdev_priv(netdev);
662 struct device *dev = &adapter->vdev->dev;
663 long lpar_rc;
664 int i;
665
666 netdev_dbg(netdev, "close starting\n");
667
668 napi_disable(&adapter->napi);
669
670 if (!adapter->pool_config)
671 netif_stop_queue(netdev);
672
673 h_vio_signal(adapter->vdev->unit_address, VIO_IRQ_DISABLE);
674
675 do {
676 lpar_rc = h_free_logical_lan(adapter->vdev->unit_address);
677 } while (H_IS_LONG_BUSY(lpar_rc) || (lpar_rc == H_BUSY));
678
679 if (lpar_rc != H_SUCCESS) {
680 netdev_err(netdev, "h_free_logical_lan failed with %lx, "
681 "continuing with close\n", lpar_rc);
682 }
683
684 free_irq(netdev->irq, netdev);
685
686 ibmveth_update_rx_no_buffer(adapter);
687
688 dma_unmap_single(dev, adapter->buffer_list_dma, 4096,
689 DMA_BIDIRECTIONAL);
690 free_page((unsigned long)adapter->buffer_list_addr);
691
692 dma_unmap_single(dev, adapter->filter_list_dma, 4096,
693 DMA_BIDIRECTIONAL);
694 free_page((unsigned long)adapter->filter_list_addr);
695
696 dma_free_coherent(dev, adapter->rx_queue.queue_len,
697 adapter->rx_queue.queue_addr,
698 adapter->rx_queue.queue_dma);
699
700 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
701 if (adapter->rx_buff_pool[i].active)
702 ibmveth_free_buffer_pool(adapter,
703 &adapter->rx_buff_pool[i]);
704
705 dma_unmap_single(&adapter->vdev->dev, adapter->bounce_buffer_dma,
706 adapter->netdev->mtu + IBMVETH_BUFF_OH,
707 DMA_BIDIRECTIONAL);
708 kfree(adapter->bounce_buffer);
709
710 netdev_dbg(netdev, "close complete\n");
711
712 return 0;
713}
714
715static int ibmveth_set_link_ksettings(struct net_device *dev,
716 const struct ethtool_link_ksettings *cmd)
717{
718 struct ibmveth_adapter *adapter = netdev_priv(dev);
719
720 return ethtool_virtdev_set_link_ksettings(dev, cmd,
721 &adapter->speed,
722 &adapter->duplex);
723}
724
725static int ibmveth_get_link_ksettings(struct net_device *dev,
726 struct ethtool_link_ksettings *cmd)
727{
728 struct ibmveth_adapter *adapter = netdev_priv(dev);
729
730 cmd->base.speed = adapter->speed;
731 cmd->base.duplex = adapter->duplex;
732 cmd->base.port = PORT_OTHER;
733
734 return 0;
735}
736
737static void ibmveth_init_link_settings(struct net_device *dev)
738{
739 struct ibmveth_adapter *adapter = netdev_priv(dev);
740
741 adapter->speed = SPEED_1000;
742 adapter->duplex = DUPLEX_FULL;
743}
744
745static void netdev_get_drvinfo(struct net_device *dev,
746 struct ethtool_drvinfo *info)
747{
748 strlcpy(info->driver, ibmveth_driver_name, sizeof(info->driver));
749 strlcpy(info->version, ibmveth_driver_version, sizeof(info->version));
750}
751
752static netdev_features_t ibmveth_fix_features(struct net_device *dev,
753 netdev_features_t features)
754{
755 /*
756 * Since the ibmveth firmware interface does not have the
757 * concept of separate tx/rx checksum offload enable, if rx
758 * checksum is disabled we also have to disable tx checksum
759 * offload. Once we disable rx checksum offload, we are no
760 * longer allowed to send tx buffers that are not properly
761 * checksummed.
762 */
763
764 if (!(features & NETIF_F_RXCSUM))
765 features &= ~NETIF_F_CSUM_MASK;
766
767 return features;
768}
769
770static int ibmveth_set_csum_offload(struct net_device *dev, u32 data)
771{
772 struct ibmveth_adapter *adapter = netdev_priv(dev);
773 unsigned long set_attr, clr_attr, ret_attr;
774 unsigned long set_attr6, clr_attr6;
775 long ret, ret4, ret6;
776 int rc1 = 0, rc2 = 0;
777 int restart = 0;
778
779 if (netif_running(dev)) {
780 restart = 1;
781 adapter->pool_config = 1;
782 ibmveth_close(dev);
783 adapter->pool_config = 0;
784 }
785
786 set_attr = 0;
787 clr_attr = 0;
788 set_attr6 = 0;
789 clr_attr6 = 0;
790
791 if (data) {
792 set_attr = IBMVETH_ILLAN_IPV4_TCP_CSUM;
793 set_attr6 = IBMVETH_ILLAN_IPV6_TCP_CSUM;
794 } else {
795 clr_attr = IBMVETH_ILLAN_IPV4_TCP_CSUM;
796 clr_attr6 = IBMVETH_ILLAN_IPV6_TCP_CSUM;
797 }
798
799 ret = h_illan_attributes(adapter->vdev->unit_address, 0, 0, &ret_attr);
800
801 if (ret == H_SUCCESS &&
802 (ret_attr & IBMVETH_ILLAN_PADDED_PKT_CSUM)) {
803 ret4 = h_illan_attributes(adapter->vdev->unit_address, clr_attr,
804 set_attr, &ret_attr);
805
806 if (ret4 != H_SUCCESS) {
807 netdev_err(dev, "unable to change IPv4 checksum "
808 "offload settings. %d rc=%ld\n",
809 data, ret4);
810
811 h_illan_attributes(adapter->vdev->unit_address,
812 set_attr, clr_attr, &ret_attr);
813
814 if (data == 1)
815 dev->features &= ~NETIF_F_IP_CSUM;
816
817 } else {
818 adapter->fw_ipv4_csum_support = data;
819 }
820
821 ret6 = h_illan_attributes(adapter->vdev->unit_address,
822 clr_attr6, set_attr6, &ret_attr);
823
824 if (ret6 != H_SUCCESS) {
825 netdev_err(dev, "unable to change IPv6 checksum "
826 "offload settings. %d rc=%ld\n",
827 data, ret6);
828
829 h_illan_attributes(adapter->vdev->unit_address,
830 set_attr6, clr_attr6, &ret_attr);
831
832 if (data == 1)
833 dev->features &= ~NETIF_F_IPV6_CSUM;
834
835 } else
836 adapter->fw_ipv6_csum_support = data;
837
838 if (ret4 == H_SUCCESS || ret6 == H_SUCCESS)
839 adapter->rx_csum = data;
840 else
841 rc1 = -EIO;
842 } else {
843 rc1 = -EIO;
844 netdev_err(dev, "unable to change checksum offload settings."
845 " %d rc=%ld ret_attr=%lx\n", data, ret,
846 ret_attr);
847 }
848
849 if (restart)
850 rc2 = ibmveth_open(dev);
851
852 return rc1 ? rc1 : rc2;
853}
854
855static int ibmveth_set_tso(struct net_device *dev, u32 data)
856{
857 struct ibmveth_adapter *adapter = netdev_priv(dev);
858 unsigned long set_attr, clr_attr, ret_attr;
859 long ret1, ret2;
860 int rc1 = 0, rc2 = 0;
861 int restart = 0;
862
863 if (netif_running(dev)) {
864 restart = 1;
865 adapter->pool_config = 1;
866 ibmveth_close(dev);
867 adapter->pool_config = 0;
868 }
869
870 set_attr = 0;
871 clr_attr = 0;
872
873 if (data)
874 set_attr = IBMVETH_ILLAN_LRG_SR_ENABLED;
875 else
876 clr_attr = IBMVETH_ILLAN_LRG_SR_ENABLED;
877
878 ret1 = h_illan_attributes(adapter->vdev->unit_address, 0, 0, &ret_attr);
879
880 if (ret1 == H_SUCCESS && (ret_attr & IBMVETH_ILLAN_LRG_SND_SUPPORT) &&
881 !old_large_send) {
882 ret2 = h_illan_attributes(adapter->vdev->unit_address, clr_attr,
883 set_attr, &ret_attr);
884
885 if (ret2 != H_SUCCESS) {
886 netdev_err(dev, "unable to change tso settings. %d rc=%ld\n",
887 data, ret2);
888
889 h_illan_attributes(adapter->vdev->unit_address,
890 set_attr, clr_attr, &ret_attr);
891
892 if (data == 1)
893 dev->features &= ~(NETIF_F_TSO | NETIF_F_TSO6);
894 rc1 = -EIO;
895
896 } else {
897 adapter->fw_large_send_support = data;
898 adapter->large_send = data;
899 }
900 } else {
901 /* Older firmware version of large send offload does not
902 * support tcp6/ipv6
903 */
904 if (data == 1) {
905 dev->features &= ~NETIF_F_TSO6;
906 netdev_info(dev, "TSO feature requires all partitions to have updated driver");
907 }
908 adapter->large_send = data;
909 }
910
911 if (restart)
912 rc2 = ibmveth_open(dev);
913
914 return rc1 ? rc1 : rc2;
915}
916
917static int ibmveth_set_features(struct net_device *dev,
918 netdev_features_t features)
919{
920 struct ibmveth_adapter *adapter = netdev_priv(dev);
921 int rx_csum = !!(features & NETIF_F_RXCSUM);
922 int large_send = !!(features & (NETIF_F_TSO | NETIF_F_TSO6));
923 int rc1 = 0, rc2 = 0;
924
925 if (rx_csum != adapter->rx_csum) {
926 rc1 = ibmveth_set_csum_offload(dev, rx_csum);
927 if (rc1 && !adapter->rx_csum)
928 dev->features =
929 features & ~(NETIF_F_CSUM_MASK |
930 NETIF_F_RXCSUM);
931 }
932
933 if (large_send != adapter->large_send) {
934 rc2 = ibmveth_set_tso(dev, large_send);
935 if (rc2 && !adapter->large_send)
936 dev->features =
937 features & ~(NETIF_F_TSO | NETIF_F_TSO6);
938 }
939
940 return rc1 ? rc1 : rc2;
941}
942
943static void ibmveth_get_strings(struct net_device *dev, u32 stringset, u8 *data)
944{
945 int i;
946
947 if (stringset != ETH_SS_STATS)
948 return;
949
950 for (i = 0; i < ARRAY_SIZE(ibmveth_stats); i++, data += ETH_GSTRING_LEN)
951 memcpy(data, ibmveth_stats[i].name, ETH_GSTRING_LEN);
952}
953
954static int ibmveth_get_sset_count(struct net_device *dev, int sset)
955{
956 switch (sset) {
957 case ETH_SS_STATS:
958 return ARRAY_SIZE(ibmveth_stats);
959 default:
960 return -EOPNOTSUPP;
961 }
962}
963
964static void ibmveth_get_ethtool_stats(struct net_device *dev,
965 struct ethtool_stats *stats, u64 *data)
966{
967 int i;
968 struct ibmveth_adapter *adapter = netdev_priv(dev);
969
970 for (i = 0; i < ARRAY_SIZE(ibmveth_stats); i++)
971 data[i] = IBMVETH_GET_STAT(adapter, ibmveth_stats[i].offset);
972}
973
974static const struct ethtool_ops netdev_ethtool_ops = {
975 .get_drvinfo = netdev_get_drvinfo,
976 .get_link = ethtool_op_get_link,
977 .get_strings = ibmveth_get_strings,
978 .get_sset_count = ibmveth_get_sset_count,
979 .get_ethtool_stats = ibmveth_get_ethtool_stats,
980 .get_link_ksettings = ibmveth_get_link_ksettings,
981 .set_link_ksettings = ibmveth_set_link_ksettings,
982};
983
984static int ibmveth_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
985{
986 return -EOPNOTSUPP;
987}
988
989static int ibmveth_send(struct ibmveth_adapter *adapter,
990 union ibmveth_buf_desc *descs, unsigned long mss)
991{
992 unsigned long correlator;
993 unsigned int retry_count;
994 unsigned long ret;
995
996 /*
997 * The retry count sets a maximum for the number of broadcast and
998 * multicast destinations within the system.
999 */
1000 retry_count = 1024;
1001 correlator = 0;
1002 do {
1003 ret = h_send_logical_lan(adapter->vdev->unit_address,
1004 descs[0].desc, descs[1].desc,
1005 descs[2].desc, descs[3].desc,
1006 descs[4].desc, descs[5].desc,
1007 correlator, &correlator, mss,
1008 adapter->fw_large_send_support);
1009 } while ((ret == H_BUSY) && (retry_count--));
1010
1011 if (ret != H_SUCCESS && ret != H_DROPPED) {
1012 netdev_err(adapter->netdev, "tx: h_send_logical_lan failed "
1013 "with rc=%ld\n", ret);
1014 return 1;
1015 }
1016
1017 return 0;
1018}
1019
1020static int ibmveth_is_packet_unsupported(struct sk_buff *skb,
1021 struct net_device *netdev)
1022{
1023 struct ethhdr *ether_header;
1024 int ret = 0;
1025
1026 ether_header = eth_hdr(skb);
1027
1028 if (ether_addr_equal(ether_header->h_dest, netdev->dev_addr)) {
1029 netdev_dbg(netdev, "veth doesn't support loopback packets, dropping packet.\n");
1030 netdev->stats.tx_dropped++;
1031 ret = -EOPNOTSUPP;
1032 }
1033
1034 if (!ether_addr_equal(ether_header->h_source, netdev->dev_addr)) {
1035 netdev_dbg(netdev, "source packet MAC address does not match veth device's, dropping packet.\n");
1036 netdev->stats.tx_dropped++;
1037 ret = -EOPNOTSUPP;
1038 }
1039
1040 return ret;
1041}
1042
1043static netdev_tx_t ibmveth_start_xmit(struct sk_buff *skb,
1044 struct net_device *netdev)
1045{
1046 struct ibmveth_adapter *adapter = netdev_priv(netdev);
1047 unsigned int desc_flags;
1048 union ibmveth_buf_desc descs[6];
1049 int last, i;
1050 int force_bounce = 0;
1051 dma_addr_t dma_addr;
1052 unsigned long mss = 0;
1053
1054 if (ibmveth_is_packet_unsupported(skb, netdev))
1055 goto out;
1056
1057 /* veth doesn't handle frag_list, so linearize the skb.
1058 * When GRO is enabled SKB's can have frag_list.
1059 */
1060 if (adapter->is_active_trunk &&
1061 skb_has_frag_list(skb) && __skb_linearize(skb)) {
1062 netdev->stats.tx_dropped++;
1063 goto out;
1064 }
1065
1066 /*
1067 * veth handles a maximum of 6 segments including the header, so
1068 * we have to linearize the skb if there are more than this.
1069 */
1070 if (skb_shinfo(skb)->nr_frags > 5 && __skb_linearize(skb)) {
1071 netdev->stats.tx_dropped++;
1072 goto out;
1073 }
1074
1075 /* veth can't checksum offload UDP */
1076 if (skb->ip_summed == CHECKSUM_PARTIAL &&
1077 ((skb->protocol == htons(ETH_P_IP) &&
1078 ip_hdr(skb)->protocol != IPPROTO_TCP) ||
1079 (skb->protocol == htons(ETH_P_IPV6) &&
1080 ipv6_hdr(skb)->nexthdr != IPPROTO_TCP)) &&
1081 skb_checksum_help(skb)) {
1082
1083 netdev_err(netdev, "tx: failed to checksum packet\n");
1084 netdev->stats.tx_dropped++;
1085 goto out;
1086 }
1087
1088 desc_flags = IBMVETH_BUF_VALID;
1089
1090 if (skb->ip_summed == CHECKSUM_PARTIAL) {
1091 unsigned char *buf = skb_transport_header(skb) +
1092 skb->csum_offset;
1093
1094 desc_flags |= (IBMVETH_BUF_NO_CSUM | IBMVETH_BUF_CSUM_GOOD);
1095
1096 /* Need to zero out the checksum */
1097 buf[0] = 0;
1098 buf[1] = 0;
1099
1100 if (skb_is_gso(skb) && adapter->fw_large_send_support)
1101 desc_flags |= IBMVETH_BUF_LRG_SND;
1102 }
1103
1104retry_bounce:
1105 memset(descs, 0, sizeof(descs));
1106
1107 /*
1108 * If a linear packet is below the rx threshold then
1109 * copy it into the static bounce buffer. This avoids the
1110 * cost of a TCE insert and remove.
1111 */
1112 if (force_bounce || (!skb_is_nonlinear(skb) &&
1113 (skb->len < tx_copybreak))) {
1114 skb_copy_from_linear_data(skb, adapter->bounce_buffer,
1115 skb->len);
1116
1117 descs[0].fields.flags_len = desc_flags | skb->len;
1118 descs[0].fields.address = adapter->bounce_buffer_dma;
1119
1120 if (ibmveth_send(adapter, descs, 0)) {
1121 adapter->tx_send_failed++;
1122 netdev->stats.tx_dropped++;
1123 } else {
1124 netdev->stats.tx_packets++;
1125 netdev->stats.tx_bytes += skb->len;
1126 }
1127
1128 goto out;
1129 }
1130
1131 /* Map the header */
1132 dma_addr = dma_map_single(&adapter->vdev->dev, skb->data,
1133 skb_headlen(skb), DMA_TO_DEVICE);
1134 if (dma_mapping_error(&adapter->vdev->dev, dma_addr))
1135 goto map_failed;
1136
1137 descs[0].fields.flags_len = desc_flags | skb_headlen(skb);
1138 descs[0].fields.address = dma_addr;
1139
1140 /* Map the frags */
1141 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1142 const skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1143
1144 dma_addr = skb_frag_dma_map(&adapter->vdev->dev, frag, 0,
1145 skb_frag_size(frag), DMA_TO_DEVICE);
1146
1147 if (dma_mapping_error(&adapter->vdev->dev, dma_addr))
1148 goto map_failed_frags;
1149
1150 descs[i+1].fields.flags_len = desc_flags | skb_frag_size(frag);
1151 descs[i+1].fields.address = dma_addr;
1152 }
1153
1154 if (skb->ip_summed == CHECKSUM_PARTIAL && skb_is_gso(skb)) {
1155 if (adapter->fw_large_send_support) {
1156 mss = (unsigned long)skb_shinfo(skb)->gso_size;
1157 adapter->tx_large_packets++;
1158 } else if (!skb_is_gso_v6(skb)) {
1159 /* Put -1 in the IP checksum to tell phyp it
1160 * is a largesend packet. Put the mss in
1161 * the TCP checksum.
1162 */
1163 ip_hdr(skb)->check = 0xffff;
1164 tcp_hdr(skb)->check =
1165 cpu_to_be16(skb_shinfo(skb)->gso_size);
1166 adapter->tx_large_packets++;
1167 }
1168 }
1169
1170 if (ibmveth_send(adapter, descs, mss)) {
1171 adapter->tx_send_failed++;
1172 netdev->stats.tx_dropped++;
1173 } else {
1174 netdev->stats.tx_packets++;
1175 netdev->stats.tx_bytes += skb->len;
1176 }
1177
1178 dma_unmap_single(&adapter->vdev->dev,
1179 descs[0].fields.address,
1180 descs[0].fields.flags_len & IBMVETH_BUF_LEN_MASK,
1181 DMA_TO_DEVICE);
1182
1183 for (i = 1; i < skb_shinfo(skb)->nr_frags + 1; i++)
1184 dma_unmap_page(&adapter->vdev->dev, descs[i].fields.address,
1185 descs[i].fields.flags_len & IBMVETH_BUF_LEN_MASK,
1186 DMA_TO_DEVICE);
1187
1188out:
1189 dev_consume_skb_any(skb);
1190 return NETDEV_TX_OK;
1191
1192map_failed_frags:
1193 last = i+1;
1194 for (i = 1; i < last; i++)
1195 dma_unmap_page(&adapter->vdev->dev, descs[i].fields.address,
1196 descs[i].fields.flags_len & IBMVETH_BUF_LEN_MASK,
1197 DMA_TO_DEVICE);
1198
1199 dma_unmap_single(&adapter->vdev->dev,
1200 descs[0].fields.address,
1201 descs[0].fields.flags_len & IBMVETH_BUF_LEN_MASK,
1202 DMA_TO_DEVICE);
1203map_failed:
1204 if (!firmware_has_feature(FW_FEATURE_CMO))
1205 netdev_err(netdev, "tx: unable to map xmit buffer\n");
1206 adapter->tx_map_failed++;
1207 if (skb_linearize(skb)) {
1208 netdev->stats.tx_dropped++;
1209 goto out;
1210 }
1211 force_bounce = 1;
1212 goto retry_bounce;
1213}
1214
1215static void ibmveth_rx_mss_helper(struct sk_buff *skb, u16 mss, int lrg_pkt)
1216{
1217 struct tcphdr *tcph;
1218 int offset = 0;
1219 int hdr_len;
1220
1221 /* only TCP packets will be aggregated */
1222 if (skb->protocol == htons(ETH_P_IP)) {
1223 struct iphdr *iph = (struct iphdr *)skb->data;
1224
1225 if (iph->protocol == IPPROTO_TCP) {
1226 offset = iph->ihl * 4;
1227 skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4;
1228 } else {
1229 return;
1230 }
1231 } else if (skb->protocol == htons(ETH_P_IPV6)) {
1232 struct ipv6hdr *iph6 = (struct ipv6hdr *)skb->data;
1233
1234 if (iph6->nexthdr == IPPROTO_TCP) {
1235 offset = sizeof(struct ipv6hdr);
1236 skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6;
1237 } else {
1238 return;
1239 }
1240 } else {
1241 return;
1242 }
1243 /* if mss is not set through Large Packet bit/mss in rx buffer,
1244 * expect that the mss will be written to the tcp header checksum.
1245 */
1246 tcph = (struct tcphdr *)(skb->data + offset);
1247 if (lrg_pkt) {
1248 skb_shinfo(skb)->gso_size = mss;
1249 } else if (offset) {
1250 skb_shinfo(skb)->gso_size = ntohs(tcph->check);
1251 tcph->check = 0;
1252 }
1253
1254 if (skb_shinfo(skb)->gso_size) {
1255 hdr_len = offset + tcph->doff * 4;
1256 skb_shinfo(skb)->gso_segs =
1257 DIV_ROUND_UP(skb->len - hdr_len,
1258 skb_shinfo(skb)->gso_size);
1259 }
1260}
1261
1262static void ibmveth_rx_csum_helper(struct sk_buff *skb,
1263 struct ibmveth_adapter *adapter)
1264{
1265 struct iphdr *iph = NULL;
1266 struct ipv6hdr *iph6 = NULL;
1267 __be16 skb_proto = 0;
1268 u16 iphlen = 0;
1269 u16 iph_proto = 0;
1270 u16 tcphdrlen = 0;
1271
1272 skb_proto = be16_to_cpu(skb->protocol);
1273
1274 if (skb_proto == ETH_P_IP) {
1275 iph = (struct iphdr *)skb->data;
1276
1277 /* If the IP checksum is not offloaded and if the packet
1278 * is large send, the checksum must be rebuilt.
1279 */
1280 if (iph->check == 0xffff) {
1281 iph->check = 0;
1282 iph->check = ip_fast_csum((unsigned char *)iph,
1283 iph->ihl);
1284 }
1285
1286 iphlen = iph->ihl * 4;
1287 iph_proto = iph->protocol;
1288 } else if (skb_proto == ETH_P_IPV6) {
1289 iph6 = (struct ipv6hdr *)skb->data;
1290 iphlen = sizeof(struct ipv6hdr);
1291 iph_proto = iph6->nexthdr;
1292 }
1293
1294 /* In OVS environment, when a flow is not cached, specifically for a
1295 * new TCP connection, the first packet information is passed up
1296 * the user space for finding a flow. During this process, OVS computes
1297 * checksum on the first packet when CHECKSUM_PARTIAL flag is set.
1298 *
1299 * Given that we zeroed out TCP checksum field in transmit path
1300 * (refer ibmveth_start_xmit routine) as we set "no checksum bit",
1301 * OVS computed checksum will be incorrect w/o TCP pseudo checksum
1302 * in the packet. This leads to OVS dropping the packet and hence
1303 * TCP retransmissions are seen.
1304 *
1305 * So, re-compute TCP pseudo header checksum.
1306 */
1307 if (iph_proto == IPPROTO_TCP && adapter->is_active_trunk) {
1308 struct tcphdr *tcph = (struct tcphdr *)(skb->data + iphlen);
1309
1310 tcphdrlen = skb->len - iphlen;
1311
1312 /* Recompute TCP pseudo header checksum */
1313 if (skb_proto == ETH_P_IP)
1314 tcph->check = ~csum_tcpudp_magic(iph->saddr,
1315 iph->daddr, tcphdrlen, iph_proto, 0);
1316 else if (skb_proto == ETH_P_IPV6)
1317 tcph->check = ~csum_ipv6_magic(&iph6->saddr,
1318 &iph6->daddr, tcphdrlen, iph_proto, 0);
1319
1320 /* Setup SKB fields for checksum offload */
1321 skb_partial_csum_set(skb, iphlen,
1322 offsetof(struct tcphdr, check));
1323 skb_reset_network_header(skb);
1324 }
1325}
1326
1327static int ibmveth_poll(struct napi_struct *napi, int budget)
1328{
1329 struct ibmveth_adapter *adapter =
1330 container_of(napi, struct ibmveth_adapter, napi);
1331 struct net_device *netdev = adapter->netdev;
1332 int frames_processed = 0;
1333 unsigned long lpar_rc;
1334 u16 mss = 0;
1335
1336 while (frames_processed < budget) {
1337 if (!ibmveth_rxq_pending_buffer(adapter))
1338 break;
1339
1340 smp_rmb();
1341 if (!ibmveth_rxq_buffer_valid(adapter)) {
1342 wmb(); /* suggested by larson1 */
1343 adapter->rx_invalid_buffer++;
1344 netdev_dbg(netdev, "recycling invalid buffer\n");
1345 ibmveth_rxq_recycle_buffer(adapter);
1346 } else {
1347 struct sk_buff *skb, *new_skb;
1348 int length = ibmveth_rxq_frame_length(adapter);
1349 int offset = ibmveth_rxq_frame_offset(adapter);
1350 int csum_good = ibmveth_rxq_csum_good(adapter);
1351 int lrg_pkt = ibmveth_rxq_large_packet(adapter);
1352
1353 skb = ibmveth_rxq_get_buffer(adapter);
1354
1355 /* if the large packet bit is set in the rx queue
1356 * descriptor, the mss will be written by PHYP eight
1357 * bytes from the start of the rx buffer, which is
1358 * skb->data at this stage
1359 */
1360 if (lrg_pkt) {
1361 __be64 *rxmss = (__be64 *)(skb->data + 8);
1362
1363 mss = (u16)be64_to_cpu(*rxmss);
1364 }
1365
1366 new_skb = NULL;
1367 if (length < rx_copybreak)
1368 new_skb = netdev_alloc_skb(netdev, length);
1369
1370 if (new_skb) {
1371 skb_copy_to_linear_data(new_skb,
1372 skb->data + offset,
1373 length);
1374 if (rx_flush)
1375 ibmveth_flush_buffer(skb->data,
1376 length + offset);
1377 if (!ibmveth_rxq_recycle_buffer(adapter))
1378 kfree_skb(skb);
1379 skb = new_skb;
1380 } else {
1381 ibmveth_rxq_harvest_buffer(adapter);
1382 skb_reserve(skb, offset);
1383 }
1384
1385 skb_put(skb, length);
1386 skb->protocol = eth_type_trans(skb, netdev);
1387
1388 if (csum_good) {
1389 skb->ip_summed = CHECKSUM_UNNECESSARY;
1390 ibmveth_rx_csum_helper(skb, adapter);
1391 }
1392
1393 if (length > netdev->mtu + ETH_HLEN) {
1394 ibmveth_rx_mss_helper(skb, mss, lrg_pkt);
1395 adapter->rx_large_packets++;
1396 }
1397
1398 napi_gro_receive(napi, skb); /* send it up */
1399
1400 netdev->stats.rx_packets++;
1401 netdev->stats.rx_bytes += length;
1402 frames_processed++;
1403 }
1404 }
1405
1406 ibmveth_replenish_task(adapter);
1407
1408 if (frames_processed < budget) {
1409 napi_complete_done(napi, frames_processed);
1410
1411 /* We think we are done - reenable interrupts,
1412 * then check once more to make sure we are done.
1413 */
1414 lpar_rc = h_vio_signal(adapter->vdev->unit_address,
1415 VIO_IRQ_ENABLE);
1416
1417 BUG_ON(lpar_rc != H_SUCCESS);
1418
1419 if (ibmveth_rxq_pending_buffer(adapter) &&
1420 napi_reschedule(napi)) {
1421 lpar_rc = h_vio_signal(adapter->vdev->unit_address,
1422 VIO_IRQ_DISABLE);
1423 }
1424 }
1425
1426 return frames_processed;
1427}
1428
1429static irqreturn_t ibmveth_interrupt(int irq, void *dev_instance)
1430{
1431 struct net_device *netdev = dev_instance;
1432 struct ibmveth_adapter *adapter = netdev_priv(netdev);
1433 unsigned long lpar_rc;
1434
1435 if (napi_schedule_prep(&adapter->napi)) {
1436 lpar_rc = h_vio_signal(adapter->vdev->unit_address,
1437 VIO_IRQ_DISABLE);
1438 BUG_ON(lpar_rc != H_SUCCESS);
1439 __napi_schedule(&adapter->napi);
1440 }
1441 return IRQ_HANDLED;
1442}
1443
1444static void ibmveth_set_multicast_list(struct net_device *netdev)
1445{
1446 struct ibmveth_adapter *adapter = netdev_priv(netdev);
1447 unsigned long lpar_rc;
1448
1449 if ((netdev->flags & IFF_PROMISC) ||
1450 (netdev_mc_count(netdev) > adapter->mcastFilterSize)) {
1451 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1452 IbmVethMcastEnableRecv |
1453 IbmVethMcastDisableFiltering,
1454 0);
1455 if (lpar_rc != H_SUCCESS) {
1456 netdev_err(netdev, "h_multicast_ctrl rc=%ld when "
1457 "entering promisc mode\n", lpar_rc);
1458 }
1459 } else {
1460 struct netdev_hw_addr *ha;
1461 /* clear the filter table & disable filtering */
1462 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1463 IbmVethMcastEnableRecv |
1464 IbmVethMcastDisableFiltering |
1465 IbmVethMcastClearFilterTable,
1466 0);
1467 if (lpar_rc != H_SUCCESS) {
1468 netdev_err(netdev, "h_multicast_ctrl rc=%ld when "
1469 "attempting to clear filter table\n",
1470 lpar_rc);
1471 }
1472 /* add the addresses to the filter table */
1473 netdev_for_each_mc_addr(ha, netdev) {
1474 /* add the multicast address to the filter table */
1475 u64 mcast_addr;
1476 mcast_addr = ibmveth_encode_mac_addr(ha->addr);
1477 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1478 IbmVethMcastAddFilter,
1479 mcast_addr);
1480 if (lpar_rc != H_SUCCESS) {
1481 netdev_err(netdev, "h_multicast_ctrl rc=%ld "
1482 "when adding an entry to the filter "
1483 "table\n", lpar_rc);
1484 }
1485 }
1486
1487 /* re-enable filtering */
1488 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1489 IbmVethMcastEnableFiltering,
1490 0);
1491 if (lpar_rc != H_SUCCESS) {
1492 netdev_err(netdev, "h_multicast_ctrl rc=%ld when "
1493 "enabling filtering\n", lpar_rc);
1494 }
1495 }
1496}
1497
1498static int ibmveth_change_mtu(struct net_device *dev, int new_mtu)
1499{
1500 struct ibmveth_adapter *adapter = netdev_priv(dev);
1501 struct vio_dev *viodev = adapter->vdev;
1502 int new_mtu_oh = new_mtu + IBMVETH_BUFF_OH;
1503 int i, rc;
1504 int need_restart = 0;
1505
1506 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
1507 if (new_mtu_oh <= adapter->rx_buff_pool[i].buff_size)
1508 break;
1509
1510 if (i == IBMVETH_NUM_BUFF_POOLS)
1511 return -EINVAL;
1512
1513 /* Deactivate all the buffer pools so that the next loop can activate
1514 only the buffer pools necessary to hold the new MTU */
1515 if (netif_running(adapter->netdev)) {
1516 need_restart = 1;
1517 adapter->pool_config = 1;
1518 ibmveth_close(adapter->netdev);
1519 adapter->pool_config = 0;
1520 }
1521
1522 /* Look for an active buffer pool that can hold the new MTU */
1523 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1524 adapter->rx_buff_pool[i].active = 1;
1525
1526 if (new_mtu_oh <= adapter->rx_buff_pool[i].buff_size) {
1527 dev->mtu = new_mtu;
1528 vio_cmo_set_dev_desired(viodev,
1529 ibmveth_get_desired_dma
1530 (viodev));
1531 if (need_restart) {
1532 return ibmveth_open(adapter->netdev);
1533 }
1534 return 0;
1535 }
1536 }
1537
1538 if (need_restart && (rc = ibmveth_open(adapter->netdev)))
1539 return rc;
1540
1541 return -EINVAL;
1542}
1543
1544#ifdef CONFIG_NET_POLL_CONTROLLER
1545static void ibmveth_poll_controller(struct net_device *dev)
1546{
1547 ibmveth_replenish_task(netdev_priv(dev));
1548 ibmveth_interrupt(dev->irq, dev);
1549}
1550#endif
1551
1552/**
1553 * ibmveth_get_desired_dma - Calculate IO memory desired by the driver
1554 *
1555 * @vdev: struct vio_dev for the device whose desired IO mem is to be returned
1556 *
1557 * Return value:
1558 * Number of bytes of IO data the driver will need to perform well.
1559 */
1560static unsigned long ibmveth_get_desired_dma(struct vio_dev *vdev)
1561{
1562 struct net_device *netdev = dev_get_drvdata(&vdev->dev);
1563 struct ibmveth_adapter *adapter;
1564 struct iommu_table *tbl;
1565 unsigned long ret;
1566 int i;
1567 int rxqentries = 1;
1568
1569 tbl = get_iommu_table_base(&vdev->dev);
1570
1571 /* netdev inits at probe time along with the structures we need below*/
1572 if (netdev == NULL)
1573 return IOMMU_PAGE_ALIGN(IBMVETH_IO_ENTITLEMENT_DEFAULT, tbl);
1574
1575 adapter = netdev_priv(netdev);
1576
1577 ret = IBMVETH_BUFF_LIST_SIZE + IBMVETH_FILT_LIST_SIZE;
1578 ret += IOMMU_PAGE_ALIGN(netdev->mtu, tbl);
1579
1580 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1581 /* add the size of the active receive buffers */
1582 if (adapter->rx_buff_pool[i].active)
1583 ret +=
1584 adapter->rx_buff_pool[i].size *
1585 IOMMU_PAGE_ALIGN(adapter->rx_buff_pool[i].
1586 buff_size, tbl);
1587 rxqentries += adapter->rx_buff_pool[i].size;
1588 }
1589 /* add the size of the receive queue entries */
1590 ret += IOMMU_PAGE_ALIGN(
1591 rxqentries * sizeof(struct ibmveth_rx_q_entry), tbl);
1592
1593 return ret;
1594}
1595
1596static int ibmveth_set_mac_addr(struct net_device *dev, void *p)
1597{
1598 struct ibmveth_adapter *adapter = netdev_priv(dev);
1599 struct sockaddr *addr = p;
1600 u64 mac_address;
1601 int rc;
1602
1603 if (!is_valid_ether_addr(addr->sa_data))
1604 return -EADDRNOTAVAIL;
1605
1606 mac_address = ibmveth_encode_mac_addr(addr->sa_data);
1607 rc = h_change_logical_lan_mac(adapter->vdev->unit_address, mac_address);
1608 if (rc) {
1609 netdev_err(adapter->netdev, "h_change_logical_lan_mac failed with rc=%d\n", rc);
1610 return rc;
1611 }
1612
1613 ether_addr_copy(dev->dev_addr, addr->sa_data);
1614
1615 return 0;
1616}
1617
1618static const struct net_device_ops ibmveth_netdev_ops = {
1619 .ndo_open = ibmveth_open,
1620 .ndo_stop = ibmveth_close,
1621 .ndo_start_xmit = ibmveth_start_xmit,
1622 .ndo_set_rx_mode = ibmveth_set_multicast_list,
1623 .ndo_do_ioctl = ibmveth_ioctl,
1624 .ndo_change_mtu = ibmveth_change_mtu,
1625 .ndo_fix_features = ibmveth_fix_features,
1626 .ndo_set_features = ibmveth_set_features,
1627 .ndo_validate_addr = eth_validate_addr,
1628 .ndo_set_mac_address = ibmveth_set_mac_addr,
1629#ifdef CONFIG_NET_POLL_CONTROLLER
1630 .ndo_poll_controller = ibmveth_poll_controller,
1631#endif
1632};
1633
1634static int ibmveth_probe(struct vio_dev *dev, const struct vio_device_id *id)
1635{
1636 int rc, i, mac_len;
1637 struct net_device *netdev;
1638 struct ibmveth_adapter *adapter;
1639 unsigned char *mac_addr_p;
1640 __be32 *mcastFilterSize_p;
1641 long ret;
1642 unsigned long ret_attr;
1643
1644 dev_dbg(&dev->dev, "entering ibmveth_probe for UA 0x%x\n",
1645 dev->unit_address);
1646
1647 mac_addr_p = (unsigned char *)vio_get_attribute(dev, VETH_MAC_ADDR,
1648 &mac_len);
1649 if (!mac_addr_p) {
1650 dev_err(&dev->dev, "Can't find VETH_MAC_ADDR attribute\n");
1651 return -EINVAL;
1652 }
1653 /* Workaround for old/broken pHyp */
1654 if (mac_len == 8)
1655 mac_addr_p += 2;
1656 else if (mac_len != 6) {
1657 dev_err(&dev->dev, "VETH_MAC_ADDR attribute wrong len %d\n",
1658 mac_len);
1659 return -EINVAL;
1660 }
1661
1662 mcastFilterSize_p = (__be32 *)vio_get_attribute(dev,
1663 VETH_MCAST_FILTER_SIZE,
1664 NULL);
1665 if (!mcastFilterSize_p) {
1666 dev_err(&dev->dev, "Can't find VETH_MCAST_FILTER_SIZE "
1667 "attribute\n");
1668 return -EINVAL;
1669 }
1670
1671 netdev = alloc_etherdev(sizeof(struct ibmveth_adapter));
1672
1673 if (!netdev)
1674 return -ENOMEM;
1675
1676 adapter = netdev_priv(netdev);
1677 dev_set_drvdata(&dev->dev, netdev);
1678
1679 adapter->vdev = dev;
1680 adapter->netdev = netdev;
1681 adapter->mcastFilterSize = be32_to_cpu(*mcastFilterSize_p);
1682 adapter->pool_config = 0;
1683 ibmveth_init_link_settings(netdev);
1684
1685 netif_napi_add(netdev, &adapter->napi, ibmveth_poll, 16);
1686
1687 netdev->irq = dev->irq;
1688 netdev->netdev_ops = &ibmveth_netdev_ops;
1689 netdev->ethtool_ops = &netdev_ethtool_ops;
1690 SET_NETDEV_DEV(netdev, &dev->dev);
1691 netdev->hw_features = NETIF_F_SG;
1692 if (vio_get_attribute(dev, "ibm,illan-options", NULL) != NULL) {
1693 netdev->hw_features |= NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
1694 NETIF_F_RXCSUM;
1695 }
1696
1697 netdev->features |= netdev->hw_features;
1698
1699 ret = h_illan_attributes(adapter->vdev->unit_address, 0, 0, &ret_attr);
1700
1701 /* If running older firmware, TSO should not be enabled by default */
1702 if (ret == H_SUCCESS && (ret_attr & IBMVETH_ILLAN_LRG_SND_SUPPORT) &&
1703 !old_large_send) {
1704 netdev->hw_features |= NETIF_F_TSO | NETIF_F_TSO6;
1705 netdev->features |= netdev->hw_features;
1706 } else {
1707 netdev->hw_features |= NETIF_F_TSO;
1708 }
1709
1710 adapter->is_active_trunk = false;
1711 if (ret == H_SUCCESS && (ret_attr & IBMVETH_ILLAN_ACTIVE_TRUNK)) {
1712 adapter->is_active_trunk = true;
1713 netdev->hw_features |= NETIF_F_FRAGLIST;
1714 netdev->features |= NETIF_F_FRAGLIST;
1715 }
1716
1717 netdev->min_mtu = IBMVETH_MIN_MTU;
1718 netdev->max_mtu = ETH_MAX_MTU - IBMVETH_BUFF_OH;
1719
1720 memcpy(netdev->dev_addr, mac_addr_p, ETH_ALEN);
1721
1722 if (firmware_has_feature(FW_FEATURE_CMO))
1723 memcpy(pool_count, pool_count_cmo, sizeof(pool_count));
1724
1725 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1726 struct kobject *kobj = &adapter->rx_buff_pool[i].kobj;
1727 int error;
1728
1729 ibmveth_init_buffer_pool(&adapter->rx_buff_pool[i], i,
1730 pool_count[i], pool_size[i],
1731 pool_active[i]);
1732 error = kobject_init_and_add(kobj, &ktype_veth_pool,
1733 &dev->dev.kobj, "pool%d", i);
1734 if (!error)
1735 kobject_uevent(kobj, KOBJ_ADD);
1736 }
1737
1738 netdev_dbg(netdev, "adapter @ 0x%p\n", adapter);
1739 netdev_dbg(netdev, "registering netdev...\n");
1740
1741 ibmveth_set_features(netdev, netdev->features);
1742
1743 rc = register_netdev(netdev);
1744
1745 if (rc) {
1746 netdev_dbg(netdev, "failed to register netdev rc=%d\n", rc);
1747 free_netdev(netdev);
1748 return rc;
1749 }
1750
1751 netdev_dbg(netdev, "registered\n");
1752
1753 return 0;
1754}
1755
1756static int ibmveth_remove(struct vio_dev *dev)
1757{
1758 struct net_device *netdev = dev_get_drvdata(&dev->dev);
1759 struct ibmveth_adapter *adapter = netdev_priv(netdev);
1760 int i;
1761
1762 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
1763 kobject_put(&adapter->rx_buff_pool[i].kobj);
1764
1765 unregister_netdev(netdev);
1766
1767 free_netdev(netdev);
1768 dev_set_drvdata(&dev->dev, NULL);
1769
1770 return 0;
1771}
1772
1773static struct attribute veth_active_attr;
1774static struct attribute veth_num_attr;
1775static struct attribute veth_size_attr;
1776
1777static ssize_t veth_pool_show(struct kobject *kobj,
1778 struct attribute *attr, char *buf)
1779{
1780 struct ibmveth_buff_pool *pool = container_of(kobj,
1781 struct ibmveth_buff_pool,
1782 kobj);
1783
1784 if (attr == &veth_active_attr)
1785 return sprintf(buf, "%d\n", pool->active);
1786 else if (attr == &veth_num_attr)
1787 return sprintf(buf, "%d\n", pool->size);
1788 else if (attr == &veth_size_attr)
1789 return sprintf(buf, "%d\n", pool->buff_size);
1790 return 0;
1791}
1792
1793static ssize_t veth_pool_store(struct kobject *kobj, struct attribute *attr,
1794 const char *buf, size_t count)
1795{
1796 struct ibmveth_buff_pool *pool = container_of(kobj,
1797 struct ibmveth_buff_pool,
1798 kobj);
1799 struct net_device *netdev = dev_get_drvdata(
1800 container_of(kobj->parent, struct device, kobj));
1801 struct ibmveth_adapter *adapter = netdev_priv(netdev);
1802 long value = simple_strtol(buf, NULL, 10);
1803 long rc;
1804
1805 if (attr == &veth_active_attr) {
1806 if (value && !pool->active) {
1807 if (netif_running(netdev)) {
1808 if (ibmveth_alloc_buffer_pool(pool)) {
1809 netdev_err(netdev,
1810 "unable to alloc pool\n");
1811 return -ENOMEM;
1812 }
1813 pool->active = 1;
1814 adapter->pool_config = 1;
1815 ibmveth_close(netdev);
1816 adapter->pool_config = 0;
1817 if ((rc = ibmveth_open(netdev)))
1818 return rc;
1819 } else {
1820 pool->active = 1;
1821 }
1822 } else if (!value && pool->active) {
1823 int mtu = netdev->mtu + IBMVETH_BUFF_OH;
1824 int i;
1825 /* Make sure there is a buffer pool with buffers that
1826 can hold a packet of the size of the MTU */
1827 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1828 if (pool == &adapter->rx_buff_pool[i])
1829 continue;
1830 if (!adapter->rx_buff_pool[i].active)
1831 continue;
1832 if (mtu <= adapter->rx_buff_pool[i].buff_size)
1833 break;
1834 }
1835
1836 if (i == IBMVETH_NUM_BUFF_POOLS) {
1837 netdev_err(netdev, "no active pool >= MTU\n");
1838 return -EPERM;
1839 }
1840
1841 if (netif_running(netdev)) {
1842 adapter->pool_config = 1;
1843 ibmveth_close(netdev);
1844 pool->active = 0;
1845 adapter->pool_config = 0;
1846 if ((rc = ibmveth_open(netdev)))
1847 return rc;
1848 }
1849 pool->active = 0;
1850 }
1851 } else if (attr == &veth_num_attr) {
1852 if (value <= 0 || value > IBMVETH_MAX_POOL_COUNT) {
1853 return -EINVAL;
1854 } else {
1855 if (netif_running(netdev)) {
1856 adapter->pool_config = 1;
1857 ibmveth_close(netdev);
1858 adapter->pool_config = 0;
1859 pool->size = value;
1860 if ((rc = ibmveth_open(netdev)))
1861 return rc;
1862 } else {
1863 pool->size = value;
1864 }
1865 }
1866 } else if (attr == &veth_size_attr) {
1867 if (value <= IBMVETH_BUFF_OH || value > IBMVETH_MAX_BUF_SIZE) {
1868 return -EINVAL;
1869 } else {
1870 if (netif_running(netdev)) {
1871 adapter->pool_config = 1;
1872 ibmveth_close(netdev);
1873 adapter->pool_config = 0;
1874 pool->buff_size = value;
1875 if ((rc = ibmveth_open(netdev)))
1876 return rc;
1877 } else {
1878 pool->buff_size = value;
1879 }
1880 }
1881 }
1882
1883 /* kick the interrupt handler to allocate/deallocate pools */
1884 ibmveth_interrupt(netdev->irq, netdev);
1885 return count;
1886}
1887
1888
1889#define ATTR(_name, _mode) \
1890 struct attribute veth_##_name##_attr = { \
1891 .name = __stringify(_name), .mode = _mode, \
1892 };
1893
1894static ATTR(active, 0644);
1895static ATTR(num, 0644);
1896static ATTR(size, 0644);
1897
1898static struct attribute *veth_pool_attrs[] = {
1899 &veth_active_attr,
1900 &veth_num_attr,
1901 &veth_size_attr,
1902 NULL,
1903};
1904
1905static const struct sysfs_ops veth_pool_ops = {
1906 .show = veth_pool_show,
1907 .store = veth_pool_store,
1908};
1909
1910static struct kobj_type ktype_veth_pool = {
1911 .release = NULL,
1912 .sysfs_ops = &veth_pool_ops,
1913 .default_attrs = veth_pool_attrs,
1914};
1915
1916static int ibmveth_resume(struct device *dev)
1917{
1918 struct net_device *netdev = dev_get_drvdata(dev);
1919 ibmveth_interrupt(netdev->irq, netdev);
1920 return 0;
1921}
1922
1923static const struct vio_device_id ibmveth_device_table[] = {
1924 { "network", "IBM,l-lan"},
1925 { "", "" }
1926};
1927MODULE_DEVICE_TABLE(vio, ibmveth_device_table);
1928
1929static const struct dev_pm_ops ibmveth_pm_ops = {
1930 .resume = ibmveth_resume
1931};
1932
1933static struct vio_driver ibmveth_driver = {
1934 .id_table = ibmveth_device_table,
1935 .probe = ibmveth_probe,
1936 .remove = ibmveth_remove,
1937 .get_desired_dma = ibmveth_get_desired_dma,
1938 .name = ibmveth_driver_name,
1939 .pm = &ibmveth_pm_ops,
1940};
1941
1942static int __init ibmveth_module_init(void)
1943{
1944 printk(KERN_DEBUG "%s: %s %s\n", ibmveth_driver_name,
1945 ibmveth_driver_string, ibmveth_driver_version);
1946
1947 return vio_register_driver(&ibmveth_driver);
1948}
1949
1950static void __exit ibmveth_module_exit(void)
1951{
1952 vio_unregister_driver(&ibmveth_driver);
1953}
1954
1955module_init(ibmveth_module_init);
1956module_exit(ibmveth_module_exit);
1/*
2 * IBM Power Virtual Ethernet Device Driver
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, see <http://www.gnu.org/licenses/>.
16 *
17 * Copyright (C) IBM Corporation, 2003, 2010
18 *
19 * Authors: Dave Larson <larson1@us.ibm.com>
20 * Santiago Leon <santil@linux.vnet.ibm.com>
21 * Brian King <brking@linux.vnet.ibm.com>
22 * Robert Jennings <rcj@linux.vnet.ibm.com>
23 * Anton Blanchard <anton@au.ibm.com>
24 */
25
26#include <linux/module.h>
27#include <linux/moduleparam.h>
28#include <linux/types.h>
29#include <linux/errno.h>
30#include <linux/dma-mapping.h>
31#include <linux/kernel.h>
32#include <linux/netdevice.h>
33#include <linux/etherdevice.h>
34#include <linux/skbuff.h>
35#include <linux/init.h>
36#include <linux/interrupt.h>
37#include <linux/mm.h>
38#include <linux/pm.h>
39#include <linux/ethtool.h>
40#include <linux/in.h>
41#include <linux/ip.h>
42#include <linux/ipv6.h>
43#include <linux/slab.h>
44#include <asm/hvcall.h>
45#include <linux/atomic.h>
46#include <asm/vio.h>
47#include <asm/iommu.h>
48#include <asm/firmware.h>
49
50#include "ibmveth.h"
51
52static irqreturn_t ibmveth_interrupt(int irq, void *dev_instance);
53static void ibmveth_rxq_harvest_buffer(struct ibmveth_adapter *adapter);
54static unsigned long ibmveth_get_desired_dma(struct vio_dev *vdev);
55
56static struct kobj_type ktype_veth_pool;
57
58
59static const char ibmveth_driver_name[] = "ibmveth";
60static const char ibmveth_driver_string[] = "IBM Power Virtual Ethernet Driver";
61#define ibmveth_driver_version "1.04"
62
63MODULE_AUTHOR("Santiago Leon <santil@linux.vnet.ibm.com>");
64MODULE_DESCRIPTION("IBM Power Virtual Ethernet Driver");
65MODULE_LICENSE("GPL");
66MODULE_VERSION(ibmveth_driver_version);
67
68static unsigned int tx_copybreak __read_mostly = 128;
69module_param(tx_copybreak, uint, 0644);
70MODULE_PARM_DESC(tx_copybreak,
71 "Maximum size of packet that is copied to a new buffer on transmit");
72
73static unsigned int rx_copybreak __read_mostly = 128;
74module_param(rx_copybreak, uint, 0644);
75MODULE_PARM_DESC(rx_copybreak,
76 "Maximum size of packet that is copied to a new buffer on receive");
77
78static unsigned int rx_flush __read_mostly = 0;
79module_param(rx_flush, uint, 0644);
80MODULE_PARM_DESC(rx_flush, "Flush receive buffers before use");
81
82struct ibmveth_stat {
83 char name[ETH_GSTRING_LEN];
84 int offset;
85};
86
87#define IBMVETH_STAT_OFF(stat) offsetof(struct ibmveth_adapter, stat)
88#define IBMVETH_GET_STAT(a, off) *((u64 *)(((unsigned long)(a)) + off))
89
90struct ibmveth_stat ibmveth_stats[] = {
91 { "replenish_task_cycles", IBMVETH_STAT_OFF(replenish_task_cycles) },
92 { "replenish_no_mem", IBMVETH_STAT_OFF(replenish_no_mem) },
93 { "replenish_add_buff_failure",
94 IBMVETH_STAT_OFF(replenish_add_buff_failure) },
95 { "replenish_add_buff_success",
96 IBMVETH_STAT_OFF(replenish_add_buff_success) },
97 { "rx_invalid_buffer", IBMVETH_STAT_OFF(rx_invalid_buffer) },
98 { "rx_no_buffer", IBMVETH_STAT_OFF(rx_no_buffer) },
99 { "tx_map_failed", IBMVETH_STAT_OFF(tx_map_failed) },
100 { "tx_send_failed", IBMVETH_STAT_OFF(tx_send_failed) },
101 { "fw_enabled_ipv4_csum", IBMVETH_STAT_OFF(fw_ipv4_csum_support) },
102 { "fw_enabled_ipv6_csum", IBMVETH_STAT_OFF(fw_ipv6_csum_support) },
103};
104
105/* simple methods of getting data from the current rxq entry */
106static inline u32 ibmveth_rxq_flags(struct ibmveth_adapter *adapter)
107{
108 return be32_to_cpu(adapter->rx_queue.queue_addr[adapter->rx_queue.index].flags_off);
109}
110
111static inline int ibmveth_rxq_toggle(struct ibmveth_adapter *adapter)
112{
113 return (ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_TOGGLE) >>
114 IBMVETH_RXQ_TOGGLE_SHIFT;
115}
116
117static inline int ibmveth_rxq_pending_buffer(struct ibmveth_adapter *adapter)
118{
119 return ibmveth_rxq_toggle(adapter) == adapter->rx_queue.toggle;
120}
121
122static inline int ibmveth_rxq_buffer_valid(struct ibmveth_adapter *adapter)
123{
124 return ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_VALID;
125}
126
127static inline int ibmveth_rxq_frame_offset(struct ibmveth_adapter *adapter)
128{
129 return ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_OFF_MASK;
130}
131
132static inline int ibmveth_rxq_frame_length(struct ibmveth_adapter *adapter)
133{
134 return be32_to_cpu(adapter->rx_queue.queue_addr[adapter->rx_queue.index].length);
135}
136
137static inline int ibmveth_rxq_csum_good(struct ibmveth_adapter *adapter)
138{
139 return ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_CSUM_GOOD;
140}
141
142/* setup the initial settings for a buffer pool */
143static void ibmveth_init_buffer_pool(struct ibmveth_buff_pool *pool,
144 u32 pool_index, u32 pool_size,
145 u32 buff_size, u32 pool_active)
146{
147 pool->size = pool_size;
148 pool->index = pool_index;
149 pool->buff_size = buff_size;
150 pool->threshold = pool_size * 7 / 8;
151 pool->active = pool_active;
152}
153
154/* allocate and setup an buffer pool - called during open */
155static int ibmveth_alloc_buffer_pool(struct ibmveth_buff_pool *pool)
156{
157 int i;
158
159 pool->free_map = kmalloc(sizeof(u16) * pool->size, GFP_KERNEL);
160
161 if (!pool->free_map)
162 return -1;
163
164 pool->dma_addr = kmalloc(sizeof(dma_addr_t) * pool->size, GFP_KERNEL);
165 if (!pool->dma_addr) {
166 kfree(pool->free_map);
167 pool->free_map = NULL;
168 return -1;
169 }
170
171 pool->skbuff = kcalloc(pool->size, sizeof(void *), GFP_KERNEL);
172
173 if (!pool->skbuff) {
174 kfree(pool->dma_addr);
175 pool->dma_addr = NULL;
176
177 kfree(pool->free_map);
178 pool->free_map = NULL;
179 return -1;
180 }
181
182 memset(pool->dma_addr, 0, sizeof(dma_addr_t) * pool->size);
183
184 for (i = 0; i < pool->size; ++i)
185 pool->free_map[i] = i;
186
187 atomic_set(&pool->available, 0);
188 pool->producer_index = 0;
189 pool->consumer_index = 0;
190
191 return 0;
192}
193
194static inline void ibmveth_flush_buffer(void *addr, unsigned long length)
195{
196 unsigned long offset;
197
198 for (offset = 0; offset < length; offset += SMP_CACHE_BYTES)
199 asm("dcbfl %0,%1" :: "b" (addr), "r" (offset));
200}
201
202/* replenish the buffers for a pool. note that we don't need to
203 * skb_reserve these since they are used for incoming...
204 */
205static void ibmveth_replenish_buffer_pool(struct ibmveth_adapter *adapter,
206 struct ibmveth_buff_pool *pool)
207{
208 u32 i;
209 u32 count = pool->size - atomic_read(&pool->available);
210 u32 buffers_added = 0;
211 struct sk_buff *skb;
212 unsigned int free_index, index;
213 u64 correlator;
214 unsigned long lpar_rc;
215 dma_addr_t dma_addr;
216
217 mb();
218
219 for (i = 0; i < count; ++i) {
220 union ibmveth_buf_desc desc;
221
222 skb = netdev_alloc_skb(adapter->netdev, pool->buff_size);
223
224 if (!skb) {
225 netdev_dbg(adapter->netdev,
226 "replenish: unable to allocate skb\n");
227 adapter->replenish_no_mem++;
228 break;
229 }
230
231 free_index = pool->consumer_index;
232 pool->consumer_index++;
233 if (pool->consumer_index >= pool->size)
234 pool->consumer_index = 0;
235 index = pool->free_map[free_index];
236
237 BUG_ON(index == IBM_VETH_INVALID_MAP);
238 BUG_ON(pool->skbuff[index] != NULL);
239
240 dma_addr = dma_map_single(&adapter->vdev->dev, skb->data,
241 pool->buff_size, DMA_FROM_DEVICE);
242
243 if (dma_mapping_error(&adapter->vdev->dev, dma_addr))
244 goto failure;
245
246 pool->free_map[free_index] = IBM_VETH_INVALID_MAP;
247 pool->dma_addr[index] = dma_addr;
248 pool->skbuff[index] = skb;
249
250 correlator = ((u64)pool->index << 32) | index;
251 *(u64 *)skb->data = correlator;
252
253 desc.fields.flags_len = IBMVETH_BUF_VALID | pool->buff_size;
254 desc.fields.address = dma_addr;
255
256 if (rx_flush) {
257 unsigned int len = min(pool->buff_size,
258 adapter->netdev->mtu +
259 IBMVETH_BUFF_OH);
260 ibmveth_flush_buffer(skb->data, len);
261 }
262 lpar_rc = h_add_logical_lan_buffer(adapter->vdev->unit_address,
263 desc.desc);
264
265 if (lpar_rc != H_SUCCESS) {
266 goto failure;
267 } else {
268 buffers_added++;
269 adapter->replenish_add_buff_success++;
270 }
271 }
272
273 mb();
274 atomic_add(buffers_added, &(pool->available));
275 return;
276
277failure:
278 pool->free_map[free_index] = index;
279 pool->skbuff[index] = NULL;
280 if (pool->consumer_index == 0)
281 pool->consumer_index = pool->size - 1;
282 else
283 pool->consumer_index--;
284 if (!dma_mapping_error(&adapter->vdev->dev, dma_addr))
285 dma_unmap_single(&adapter->vdev->dev,
286 pool->dma_addr[index], pool->buff_size,
287 DMA_FROM_DEVICE);
288 dev_kfree_skb_any(skb);
289 adapter->replenish_add_buff_failure++;
290
291 mb();
292 atomic_add(buffers_added, &(pool->available));
293}
294
295/* replenish routine */
296static void ibmveth_replenish_task(struct ibmveth_adapter *adapter)
297{
298 int i;
299
300 adapter->replenish_task_cycles++;
301
302 for (i = (IBMVETH_NUM_BUFF_POOLS - 1); i >= 0; i--) {
303 struct ibmveth_buff_pool *pool = &adapter->rx_buff_pool[i];
304
305 if (pool->active &&
306 (atomic_read(&pool->available) < pool->threshold))
307 ibmveth_replenish_buffer_pool(adapter, pool);
308 }
309
310 adapter->rx_no_buffer = *(u64 *)(((char*)adapter->buffer_list_addr) +
311 4096 - 8);
312}
313
314/* empty and free ana buffer pool - also used to do cleanup in error paths */
315static void ibmveth_free_buffer_pool(struct ibmveth_adapter *adapter,
316 struct ibmveth_buff_pool *pool)
317{
318 int i;
319
320 kfree(pool->free_map);
321 pool->free_map = NULL;
322
323 if (pool->skbuff && pool->dma_addr) {
324 for (i = 0; i < pool->size; ++i) {
325 struct sk_buff *skb = pool->skbuff[i];
326 if (skb) {
327 dma_unmap_single(&adapter->vdev->dev,
328 pool->dma_addr[i],
329 pool->buff_size,
330 DMA_FROM_DEVICE);
331 dev_kfree_skb_any(skb);
332 pool->skbuff[i] = NULL;
333 }
334 }
335 }
336
337 if (pool->dma_addr) {
338 kfree(pool->dma_addr);
339 pool->dma_addr = NULL;
340 }
341
342 if (pool->skbuff) {
343 kfree(pool->skbuff);
344 pool->skbuff = NULL;
345 }
346}
347
348/* remove a buffer from a pool */
349static void ibmveth_remove_buffer_from_pool(struct ibmveth_adapter *adapter,
350 u64 correlator)
351{
352 unsigned int pool = correlator >> 32;
353 unsigned int index = correlator & 0xffffffffUL;
354 unsigned int free_index;
355 struct sk_buff *skb;
356
357 BUG_ON(pool >= IBMVETH_NUM_BUFF_POOLS);
358 BUG_ON(index >= adapter->rx_buff_pool[pool].size);
359
360 skb = adapter->rx_buff_pool[pool].skbuff[index];
361
362 BUG_ON(skb == NULL);
363
364 adapter->rx_buff_pool[pool].skbuff[index] = NULL;
365
366 dma_unmap_single(&adapter->vdev->dev,
367 adapter->rx_buff_pool[pool].dma_addr[index],
368 adapter->rx_buff_pool[pool].buff_size,
369 DMA_FROM_DEVICE);
370
371 free_index = adapter->rx_buff_pool[pool].producer_index;
372 adapter->rx_buff_pool[pool].producer_index++;
373 if (adapter->rx_buff_pool[pool].producer_index >=
374 adapter->rx_buff_pool[pool].size)
375 adapter->rx_buff_pool[pool].producer_index = 0;
376 adapter->rx_buff_pool[pool].free_map[free_index] = index;
377
378 mb();
379
380 atomic_dec(&(adapter->rx_buff_pool[pool].available));
381}
382
383/* get the current buffer on the rx queue */
384static inline struct sk_buff *ibmveth_rxq_get_buffer(struct ibmveth_adapter *adapter)
385{
386 u64 correlator = adapter->rx_queue.queue_addr[adapter->rx_queue.index].correlator;
387 unsigned int pool = correlator >> 32;
388 unsigned int index = correlator & 0xffffffffUL;
389
390 BUG_ON(pool >= IBMVETH_NUM_BUFF_POOLS);
391 BUG_ON(index >= adapter->rx_buff_pool[pool].size);
392
393 return adapter->rx_buff_pool[pool].skbuff[index];
394}
395
396/* recycle the current buffer on the rx queue */
397static int ibmveth_rxq_recycle_buffer(struct ibmveth_adapter *adapter)
398{
399 u32 q_index = adapter->rx_queue.index;
400 u64 correlator = adapter->rx_queue.queue_addr[q_index].correlator;
401 unsigned int pool = correlator >> 32;
402 unsigned int index = correlator & 0xffffffffUL;
403 union ibmveth_buf_desc desc;
404 unsigned long lpar_rc;
405 int ret = 1;
406
407 BUG_ON(pool >= IBMVETH_NUM_BUFF_POOLS);
408 BUG_ON(index >= adapter->rx_buff_pool[pool].size);
409
410 if (!adapter->rx_buff_pool[pool].active) {
411 ibmveth_rxq_harvest_buffer(adapter);
412 ibmveth_free_buffer_pool(adapter, &adapter->rx_buff_pool[pool]);
413 goto out;
414 }
415
416 desc.fields.flags_len = IBMVETH_BUF_VALID |
417 adapter->rx_buff_pool[pool].buff_size;
418 desc.fields.address = adapter->rx_buff_pool[pool].dma_addr[index];
419
420 lpar_rc = h_add_logical_lan_buffer(adapter->vdev->unit_address, desc.desc);
421
422 if (lpar_rc != H_SUCCESS) {
423 netdev_dbg(adapter->netdev, "h_add_logical_lan_buffer failed "
424 "during recycle rc=%ld", lpar_rc);
425 ibmveth_remove_buffer_from_pool(adapter, adapter->rx_queue.queue_addr[adapter->rx_queue.index].correlator);
426 ret = 0;
427 }
428
429 if (++adapter->rx_queue.index == adapter->rx_queue.num_slots) {
430 adapter->rx_queue.index = 0;
431 adapter->rx_queue.toggle = !adapter->rx_queue.toggle;
432 }
433
434out:
435 return ret;
436}
437
438static void ibmveth_rxq_harvest_buffer(struct ibmveth_adapter *adapter)
439{
440 ibmveth_remove_buffer_from_pool(adapter, adapter->rx_queue.queue_addr[adapter->rx_queue.index].correlator);
441
442 if (++adapter->rx_queue.index == adapter->rx_queue.num_slots) {
443 adapter->rx_queue.index = 0;
444 adapter->rx_queue.toggle = !adapter->rx_queue.toggle;
445 }
446}
447
448static void ibmveth_cleanup(struct ibmveth_adapter *adapter)
449{
450 int i;
451 struct device *dev = &adapter->vdev->dev;
452
453 if (adapter->buffer_list_addr != NULL) {
454 if (!dma_mapping_error(dev, adapter->buffer_list_dma)) {
455 dma_unmap_single(dev, adapter->buffer_list_dma, 4096,
456 DMA_BIDIRECTIONAL);
457 adapter->buffer_list_dma = DMA_ERROR_CODE;
458 }
459 free_page((unsigned long)adapter->buffer_list_addr);
460 adapter->buffer_list_addr = NULL;
461 }
462
463 if (adapter->filter_list_addr != NULL) {
464 if (!dma_mapping_error(dev, adapter->filter_list_dma)) {
465 dma_unmap_single(dev, adapter->filter_list_dma, 4096,
466 DMA_BIDIRECTIONAL);
467 adapter->filter_list_dma = DMA_ERROR_CODE;
468 }
469 free_page((unsigned long)adapter->filter_list_addr);
470 adapter->filter_list_addr = NULL;
471 }
472
473 if (adapter->rx_queue.queue_addr != NULL) {
474 dma_free_coherent(dev, adapter->rx_queue.queue_len,
475 adapter->rx_queue.queue_addr,
476 adapter->rx_queue.queue_dma);
477 adapter->rx_queue.queue_addr = NULL;
478 }
479
480 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
481 if (adapter->rx_buff_pool[i].active)
482 ibmveth_free_buffer_pool(adapter,
483 &adapter->rx_buff_pool[i]);
484
485 if (adapter->bounce_buffer != NULL) {
486 if (!dma_mapping_error(dev, adapter->bounce_buffer_dma)) {
487 dma_unmap_single(&adapter->vdev->dev,
488 adapter->bounce_buffer_dma,
489 adapter->netdev->mtu + IBMVETH_BUFF_OH,
490 DMA_BIDIRECTIONAL);
491 adapter->bounce_buffer_dma = DMA_ERROR_CODE;
492 }
493 kfree(adapter->bounce_buffer);
494 adapter->bounce_buffer = NULL;
495 }
496}
497
498static int ibmveth_register_logical_lan(struct ibmveth_adapter *adapter,
499 union ibmveth_buf_desc rxq_desc, u64 mac_address)
500{
501 int rc, try_again = 1;
502
503 /*
504 * After a kexec the adapter will still be open, so our attempt to
505 * open it will fail. So if we get a failure we free the adapter and
506 * try again, but only once.
507 */
508retry:
509 rc = h_register_logical_lan(adapter->vdev->unit_address,
510 adapter->buffer_list_dma, rxq_desc.desc,
511 adapter->filter_list_dma, mac_address);
512
513 if (rc != H_SUCCESS && try_again) {
514 do {
515 rc = h_free_logical_lan(adapter->vdev->unit_address);
516 } while (H_IS_LONG_BUSY(rc) || (rc == H_BUSY));
517
518 try_again = 0;
519 goto retry;
520 }
521
522 return rc;
523}
524
525static u64 ibmveth_encode_mac_addr(u8 *mac)
526{
527 int i;
528 u64 encoded = 0;
529
530 for (i = 0; i < ETH_ALEN; i++)
531 encoded = (encoded << 8) | mac[i];
532
533 return encoded;
534}
535
536static int ibmveth_open(struct net_device *netdev)
537{
538 struct ibmveth_adapter *adapter = netdev_priv(netdev);
539 u64 mac_address;
540 int rxq_entries = 1;
541 unsigned long lpar_rc;
542 int rc;
543 union ibmveth_buf_desc rxq_desc;
544 int i;
545 struct device *dev;
546
547 netdev_dbg(netdev, "open starting\n");
548
549 napi_enable(&adapter->napi);
550
551 for(i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
552 rxq_entries += adapter->rx_buff_pool[i].size;
553
554 adapter->buffer_list_addr = (void*) get_zeroed_page(GFP_KERNEL);
555 adapter->filter_list_addr = (void*) get_zeroed_page(GFP_KERNEL);
556
557 if (!adapter->buffer_list_addr || !adapter->filter_list_addr) {
558 netdev_err(netdev, "unable to allocate filter or buffer list "
559 "pages\n");
560 rc = -ENOMEM;
561 goto err_out;
562 }
563
564 dev = &adapter->vdev->dev;
565
566 adapter->rx_queue.queue_len = sizeof(struct ibmveth_rx_q_entry) *
567 rxq_entries;
568 adapter->rx_queue.queue_addr =
569 dma_alloc_coherent(dev, adapter->rx_queue.queue_len,
570 &adapter->rx_queue.queue_dma, GFP_KERNEL);
571 if (!adapter->rx_queue.queue_addr) {
572 rc = -ENOMEM;
573 goto err_out;
574 }
575
576 adapter->buffer_list_dma = dma_map_single(dev,
577 adapter->buffer_list_addr, 4096, DMA_BIDIRECTIONAL);
578 adapter->filter_list_dma = dma_map_single(dev,
579 adapter->filter_list_addr, 4096, DMA_BIDIRECTIONAL);
580
581 if ((dma_mapping_error(dev, adapter->buffer_list_dma)) ||
582 (dma_mapping_error(dev, adapter->filter_list_dma))) {
583 netdev_err(netdev, "unable to map filter or buffer list "
584 "pages\n");
585 rc = -ENOMEM;
586 goto err_out;
587 }
588
589 adapter->rx_queue.index = 0;
590 adapter->rx_queue.num_slots = rxq_entries;
591 adapter->rx_queue.toggle = 1;
592
593 mac_address = ibmveth_encode_mac_addr(netdev->dev_addr);
594
595 rxq_desc.fields.flags_len = IBMVETH_BUF_VALID |
596 adapter->rx_queue.queue_len;
597 rxq_desc.fields.address = adapter->rx_queue.queue_dma;
598
599 netdev_dbg(netdev, "buffer list @ 0x%p\n", adapter->buffer_list_addr);
600 netdev_dbg(netdev, "filter list @ 0x%p\n", adapter->filter_list_addr);
601 netdev_dbg(netdev, "receive q @ 0x%p\n", adapter->rx_queue.queue_addr);
602
603 h_vio_signal(adapter->vdev->unit_address, VIO_IRQ_DISABLE);
604
605 lpar_rc = ibmveth_register_logical_lan(adapter, rxq_desc, mac_address);
606
607 if (lpar_rc != H_SUCCESS) {
608 netdev_err(netdev, "h_register_logical_lan failed with %ld\n",
609 lpar_rc);
610 netdev_err(netdev, "buffer TCE:0x%llx filter TCE:0x%llx rxq "
611 "desc:0x%llx MAC:0x%llx\n",
612 adapter->buffer_list_dma,
613 adapter->filter_list_dma,
614 rxq_desc.desc,
615 mac_address);
616 rc = -ENONET;
617 goto err_out;
618 }
619
620 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
621 if (!adapter->rx_buff_pool[i].active)
622 continue;
623 if (ibmveth_alloc_buffer_pool(&adapter->rx_buff_pool[i])) {
624 netdev_err(netdev, "unable to alloc pool\n");
625 adapter->rx_buff_pool[i].active = 0;
626 rc = -ENOMEM;
627 goto err_out;
628 }
629 }
630
631 netdev_dbg(netdev, "registering irq 0x%x\n", netdev->irq);
632 rc = request_irq(netdev->irq, ibmveth_interrupt, 0, netdev->name,
633 netdev);
634 if (rc != 0) {
635 netdev_err(netdev, "unable to request irq 0x%x, rc %d\n",
636 netdev->irq, rc);
637 do {
638 lpar_rc = h_free_logical_lan(adapter->vdev->unit_address);
639 } while (H_IS_LONG_BUSY(lpar_rc) || (lpar_rc == H_BUSY));
640
641 goto err_out;
642 }
643
644 adapter->bounce_buffer =
645 kmalloc(netdev->mtu + IBMVETH_BUFF_OH, GFP_KERNEL);
646 if (!adapter->bounce_buffer) {
647 rc = -ENOMEM;
648 goto err_out_free_irq;
649 }
650 adapter->bounce_buffer_dma =
651 dma_map_single(&adapter->vdev->dev, adapter->bounce_buffer,
652 netdev->mtu + IBMVETH_BUFF_OH, DMA_BIDIRECTIONAL);
653 if (dma_mapping_error(dev, adapter->bounce_buffer_dma)) {
654 netdev_err(netdev, "unable to map bounce buffer\n");
655 rc = -ENOMEM;
656 goto err_out_free_irq;
657 }
658
659 netdev_dbg(netdev, "initial replenish cycle\n");
660 ibmveth_interrupt(netdev->irq, netdev);
661
662 netif_start_queue(netdev);
663
664 netdev_dbg(netdev, "open complete\n");
665
666 return 0;
667
668err_out_free_irq:
669 free_irq(netdev->irq, netdev);
670err_out:
671 ibmveth_cleanup(adapter);
672 napi_disable(&adapter->napi);
673 return rc;
674}
675
676static int ibmveth_close(struct net_device *netdev)
677{
678 struct ibmveth_adapter *adapter = netdev_priv(netdev);
679 long lpar_rc;
680
681 netdev_dbg(netdev, "close starting\n");
682
683 napi_disable(&adapter->napi);
684
685 if (!adapter->pool_config)
686 netif_stop_queue(netdev);
687
688 h_vio_signal(adapter->vdev->unit_address, VIO_IRQ_DISABLE);
689
690 do {
691 lpar_rc = h_free_logical_lan(adapter->vdev->unit_address);
692 } while (H_IS_LONG_BUSY(lpar_rc) || (lpar_rc == H_BUSY));
693
694 if (lpar_rc != H_SUCCESS) {
695 netdev_err(netdev, "h_free_logical_lan failed with %lx, "
696 "continuing with close\n", lpar_rc);
697 }
698
699 free_irq(netdev->irq, netdev);
700
701 adapter->rx_no_buffer = *(u64 *)(((char *)adapter->buffer_list_addr) +
702 4096 - 8);
703
704 ibmveth_cleanup(adapter);
705
706 netdev_dbg(netdev, "close complete\n");
707
708 return 0;
709}
710
711static int netdev_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
712{
713 cmd->supported = (SUPPORTED_1000baseT_Full | SUPPORTED_Autoneg |
714 SUPPORTED_FIBRE);
715 cmd->advertising = (ADVERTISED_1000baseT_Full | ADVERTISED_Autoneg |
716 ADVERTISED_FIBRE);
717 ethtool_cmd_speed_set(cmd, SPEED_1000);
718 cmd->duplex = DUPLEX_FULL;
719 cmd->port = PORT_FIBRE;
720 cmd->phy_address = 0;
721 cmd->transceiver = XCVR_INTERNAL;
722 cmd->autoneg = AUTONEG_ENABLE;
723 cmd->maxtxpkt = 0;
724 cmd->maxrxpkt = 1;
725 return 0;
726}
727
728static void netdev_get_drvinfo(struct net_device *dev,
729 struct ethtool_drvinfo *info)
730{
731 strlcpy(info->driver, ibmveth_driver_name, sizeof(info->driver));
732 strlcpy(info->version, ibmveth_driver_version, sizeof(info->version));
733}
734
735static netdev_features_t ibmveth_fix_features(struct net_device *dev,
736 netdev_features_t features)
737{
738 /*
739 * Since the ibmveth firmware interface does not have the
740 * concept of separate tx/rx checksum offload enable, if rx
741 * checksum is disabled we also have to disable tx checksum
742 * offload. Once we disable rx checksum offload, we are no
743 * longer allowed to send tx buffers that are not properly
744 * checksummed.
745 */
746
747 if (!(features & NETIF_F_RXCSUM))
748 features &= ~NETIF_F_ALL_CSUM;
749
750 return features;
751}
752
753static int ibmveth_set_csum_offload(struct net_device *dev, u32 data)
754{
755 struct ibmveth_adapter *adapter = netdev_priv(dev);
756 unsigned long set_attr, clr_attr, ret_attr;
757 unsigned long set_attr6, clr_attr6;
758 long ret, ret4, ret6;
759 int rc1 = 0, rc2 = 0;
760 int restart = 0;
761
762 if (netif_running(dev)) {
763 restart = 1;
764 adapter->pool_config = 1;
765 ibmveth_close(dev);
766 adapter->pool_config = 0;
767 }
768
769 set_attr = 0;
770 clr_attr = 0;
771 set_attr6 = 0;
772 clr_attr6 = 0;
773
774 if (data) {
775 set_attr = IBMVETH_ILLAN_IPV4_TCP_CSUM;
776 set_attr6 = IBMVETH_ILLAN_IPV6_TCP_CSUM;
777 } else {
778 clr_attr = IBMVETH_ILLAN_IPV4_TCP_CSUM;
779 clr_attr6 = IBMVETH_ILLAN_IPV6_TCP_CSUM;
780 }
781
782 ret = h_illan_attributes(adapter->vdev->unit_address, 0, 0, &ret_attr);
783
784 if (ret == H_SUCCESS && !(ret_attr & IBMVETH_ILLAN_ACTIVE_TRUNK) &&
785 !(ret_attr & IBMVETH_ILLAN_TRUNK_PRI_MASK) &&
786 (ret_attr & IBMVETH_ILLAN_PADDED_PKT_CSUM)) {
787 ret4 = h_illan_attributes(adapter->vdev->unit_address, clr_attr,
788 set_attr, &ret_attr);
789
790 if (ret4 != H_SUCCESS) {
791 netdev_err(dev, "unable to change IPv4 checksum "
792 "offload settings. %d rc=%ld\n",
793 data, ret4);
794
795 h_illan_attributes(adapter->vdev->unit_address,
796 set_attr, clr_attr, &ret_attr);
797
798 if (data == 1)
799 dev->features &= ~NETIF_F_IP_CSUM;
800
801 } else {
802 adapter->fw_ipv4_csum_support = data;
803 }
804
805 ret6 = h_illan_attributes(adapter->vdev->unit_address,
806 clr_attr6, set_attr6, &ret_attr);
807
808 if (ret6 != H_SUCCESS) {
809 netdev_err(dev, "unable to change IPv6 checksum "
810 "offload settings. %d rc=%ld\n",
811 data, ret6);
812
813 h_illan_attributes(adapter->vdev->unit_address,
814 set_attr6, clr_attr6, &ret_attr);
815
816 if (data == 1)
817 dev->features &= ~NETIF_F_IPV6_CSUM;
818
819 } else
820 adapter->fw_ipv6_csum_support = data;
821
822 if (ret4 == H_SUCCESS || ret6 == H_SUCCESS)
823 adapter->rx_csum = data;
824 else
825 rc1 = -EIO;
826 } else {
827 rc1 = -EIO;
828 netdev_err(dev, "unable to change checksum offload settings."
829 " %d rc=%ld ret_attr=%lx\n", data, ret,
830 ret_attr);
831 }
832
833 if (restart)
834 rc2 = ibmveth_open(dev);
835
836 return rc1 ? rc1 : rc2;
837}
838
839static int ibmveth_set_features(struct net_device *dev,
840 netdev_features_t features)
841{
842 struct ibmveth_adapter *adapter = netdev_priv(dev);
843 int rx_csum = !!(features & NETIF_F_RXCSUM);
844 int rc;
845
846 if (rx_csum == adapter->rx_csum)
847 return 0;
848
849 rc = ibmveth_set_csum_offload(dev, rx_csum);
850 if (rc && !adapter->rx_csum)
851 dev->features = features & ~(NETIF_F_ALL_CSUM | NETIF_F_RXCSUM);
852
853 return rc;
854}
855
856static void ibmveth_get_strings(struct net_device *dev, u32 stringset, u8 *data)
857{
858 int i;
859
860 if (stringset != ETH_SS_STATS)
861 return;
862
863 for (i = 0; i < ARRAY_SIZE(ibmveth_stats); i++, data += ETH_GSTRING_LEN)
864 memcpy(data, ibmveth_stats[i].name, ETH_GSTRING_LEN);
865}
866
867static int ibmveth_get_sset_count(struct net_device *dev, int sset)
868{
869 switch (sset) {
870 case ETH_SS_STATS:
871 return ARRAY_SIZE(ibmveth_stats);
872 default:
873 return -EOPNOTSUPP;
874 }
875}
876
877static void ibmveth_get_ethtool_stats(struct net_device *dev,
878 struct ethtool_stats *stats, u64 *data)
879{
880 int i;
881 struct ibmveth_adapter *adapter = netdev_priv(dev);
882
883 for (i = 0; i < ARRAY_SIZE(ibmveth_stats); i++)
884 data[i] = IBMVETH_GET_STAT(adapter, ibmveth_stats[i].offset);
885}
886
887static const struct ethtool_ops netdev_ethtool_ops = {
888 .get_drvinfo = netdev_get_drvinfo,
889 .get_settings = netdev_get_settings,
890 .get_link = ethtool_op_get_link,
891 .get_strings = ibmveth_get_strings,
892 .get_sset_count = ibmveth_get_sset_count,
893 .get_ethtool_stats = ibmveth_get_ethtool_stats,
894};
895
896static int ibmveth_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
897{
898 return -EOPNOTSUPP;
899}
900
901#define page_offset(v) ((unsigned long)(v) & ((1 << 12) - 1))
902
903static int ibmveth_send(struct ibmveth_adapter *adapter,
904 union ibmveth_buf_desc *descs)
905{
906 unsigned long correlator;
907 unsigned int retry_count;
908 unsigned long ret;
909
910 /*
911 * The retry count sets a maximum for the number of broadcast and
912 * multicast destinations within the system.
913 */
914 retry_count = 1024;
915 correlator = 0;
916 do {
917 ret = h_send_logical_lan(adapter->vdev->unit_address,
918 descs[0].desc, descs[1].desc,
919 descs[2].desc, descs[3].desc,
920 descs[4].desc, descs[5].desc,
921 correlator, &correlator);
922 } while ((ret == H_BUSY) && (retry_count--));
923
924 if (ret != H_SUCCESS && ret != H_DROPPED) {
925 netdev_err(adapter->netdev, "tx: h_send_logical_lan failed "
926 "with rc=%ld\n", ret);
927 return 1;
928 }
929
930 return 0;
931}
932
933static netdev_tx_t ibmveth_start_xmit(struct sk_buff *skb,
934 struct net_device *netdev)
935{
936 struct ibmveth_adapter *adapter = netdev_priv(netdev);
937 unsigned int desc_flags;
938 union ibmveth_buf_desc descs[6];
939 int last, i;
940 int force_bounce = 0;
941 dma_addr_t dma_addr;
942
943 /*
944 * veth handles a maximum of 6 segments including the header, so
945 * we have to linearize the skb if there are more than this.
946 */
947 if (skb_shinfo(skb)->nr_frags > 5 && __skb_linearize(skb)) {
948 netdev->stats.tx_dropped++;
949 goto out;
950 }
951
952 /* veth can't checksum offload UDP */
953 if (skb->ip_summed == CHECKSUM_PARTIAL &&
954 ((skb->protocol == htons(ETH_P_IP) &&
955 ip_hdr(skb)->protocol != IPPROTO_TCP) ||
956 (skb->protocol == htons(ETH_P_IPV6) &&
957 ipv6_hdr(skb)->nexthdr != IPPROTO_TCP)) &&
958 skb_checksum_help(skb)) {
959
960 netdev_err(netdev, "tx: failed to checksum packet\n");
961 netdev->stats.tx_dropped++;
962 goto out;
963 }
964
965 desc_flags = IBMVETH_BUF_VALID;
966
967 if (skb->ip_summed == CHECKSUM_PARTIAL) {
968 unsigned char *buf = skb_transport_header(skb) +
969 skb->csum_offset;
970
971 desc_flags |= (IBMVETH_BUF_NO_CSUM | IBMVETH_BUF_CSUM_GOOD);
972
973 /* Need to zero out the checksum */
974 buf[0] = 0;
975 buf[1] = 0;
976 }
977
978retry_bounce:
979 memset(descs, 0, sizeof(descs));
980
981 /*
982 * If a linear packet is below the rx threshold then
983 * copy it into the static bounce buffer. This avoids the
984 * cost of a TCE insert and remove.
985 */
986 if (force_bounce || (!skb_is_nonlinear(skb) &&
987 (skb->len < tx_copybreak))) {
988 skb_copy_from_linear_data(skb, adapter->bounce_buffer,
989 skb->len);
990
991 descs[0].fields.flags_len = desc_flags | skb->len;
992 descs[0].fields.address = adapter->bounce_buffer_dma;
993
994 if (ibmveth_send(adapter, descs)) {
995 adapter->tx_send_failed++;
996 netdev->stats.tx_dropped++;
997 } else {
998 netdev->stats.tx_packets++;
999 netdev->stats.tx_bytes += skb->len;
1000 }
1001
1002 goto out;
1003 }
1004
1005 /* Map the header */
1006 dma_addr = dma_map_single(&adapter->vdev->dev, skb->data,
1007 skb_headlen(skb), DMA_TO_DEVICE);
1008 if (dma_mapping_error(&adapter->vdev->dev, dma_addr))
1009 goto map_failed;
1010
1011 descs[0].fields.flags_len = desc_flags | skb_headlen(skb);
1012 descs[0].fields.address = dma_addr;
1013
1014 /* Map the frags */
1015 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1016 const skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1017
1018 dma_addr = skb_frag_dma_map(&adapter->vdev->dev, frag, 0,
1019 skb_frag_size(frag), DMA_TO_DEVICE);
1020
1021 if (dma_mapping_error(&adapter->vdev->dev, dma_addr))
1022 goto map_failed_frags;
1023
1024 descs[i+1].fields.flags_len = desc_flags | skb_frag_size(frag);
1025 descs[i+1].fields.address = dma_addr;
1026 }
1027
1028 if (ibmveth_send(adapter, descs)) {
1029 adapter->tx_send_failed++;
1030 netdev->stats.tx_dropped++;
1031 } else {
1032 netdev->stats.tx_packets++;
1033 netdev->stats.tx_bytes += skb->len;
1034 }
1035
1036 dma_unmap_single(&adapter->vdev->dev,
1037 descs[0].fields.address,
1038 descs[0].fields.flags_len & IBMVETH_BUF_LEN_MASK,
1039 DMA_TO_DEVICE);
1040
1041 for (i = 1; i < skb_shinfo(skb)->nr_frags + 1; i++)
1042 dma_unmap_page(&adapter->vdev->dev, descs[i].fields.address,
1043 descs[i].fields.flags_len & IBMVETH_BUF_LEN_MASK,
1044 DMA_TO_DEVICE);
1045
1046out:
1047 dev_consume_skb_any(skb);
1048 return NETDEV_TX_OK;
1049
1050map_failed_frags:
1051 last = i+1;
1052 for (i = 0; i < last; i++)
1053 dma_unmap_page(&adapter->vdev->dev, descs[i].fields.address,
1054 descs[i].fields.flags_len & IBMVETH_BUF_LEN_MASK,
1055 DMA_TO_DEVICE);
1056
1057map_failed:
1058 if (!firmware_has_feature(FW_FEATURE_CMO))
1059 netdev_err(netdev, "tx: unable to map xmit buffer\n");
1060 adapter->tx_map_failed++;
1061 skb_linearize(skb);
1062 force_bounce = 1;
1063 goto retry_bounce;
1064}
1065
1066static int ibmveth_poll(struct napi_struct *napi, int budget)
1067{
1068 struct ibmveth_adapter *adapter =
1069 container_of(napi, struct ibmveth_adapter, napi);
1070 struct net_device *netdev = adapter->netdev;
1071 int frames_processed = 0;
1072 unsigned long lpar_rc;
1073
1074restart_poll:
1075 while (frames_processed < budget) {
1076 if (!ibmveth_rxq_pending_buffer(adapter))
1077 break;
1078
1079 smp_rmb();
1080 if (!ibmveth_rxq_buffer_valid(adapter)) {
1081 wmb(); /* suggested by larson1 */
1082 adapter->rx_invalid_buffer++;
1083 netdev_dbg(netdev, "recycling invalid buffer\n");
1084 ibmveth_rxq_recycle_buffer(adapter);
1085 } else {
1086 struct sk_buff *skb, *new_skb;
1087 int length = ibmveth_rxq_frame_length(adapter);
1088 int offset = ibmveth_rxq_frame_offset(adapter);
1089 int csum_good = ibmveth_rxq_csum_good(adapter);
1090
1091 skb = ibmveth_rxq_get_buffer(adapter);
1092
1093 new_skb = NULL;
1094 if (length < rx_copybreak)
1095 new_skb = netdev_alloc_skb(netdev, length);
1096
1097 if (new_skb) {
1098 skb_copy_to_linear_data(new_skb,
1099 skb->data + offset,
1100 length);
1101 if (rx_flush)
1102 ibmveth_flush_buffer(skb->data,
1103 length + offset);
1104 if (!ibmveth_rxq_recycle_buffer(adapter))
1105 kfree_skb(skb);
1106 skb = new_skb;
1107 } else {
1108 ibmveth_rxq_harvest_buffer(adapter);
1109 skb_reserve(skb, offset);
1110 }
1111
1112 skb_put(skb, length);
1113 skb->protocol = eth_type_trans(skb, netdev);
1114
1115 if (csum_good)
1116 skb->ip_summed = CHECKSUM_UNNECESSARY;
1117
1118 netif_receive_skb(skb); /* send it up */
1119
1120 netdev->stats.rx_packets++;
1121 netdev->stats.rx_bytes += length;
1122 frames_processed++;
1123 }
1124 }
1125
1126 ibmveth_replenish_task(adapter);
1127
1128 if (frames_processed < budget) {
1129 /* We think we are done - reenable interrupts,
1130 * then check once more to make sure we are done.
1131 */
1132 lpar_rc = h_vio_signal(adapter->vdev->unit_address,
1133 VIO_IRQ_ENABLE);
1134
1135 BUG_ON(lpar_rc != H_SUCCESS);
1136
1137 napi_complete(napi);
1138
1139 if (ibmveth_rxq_pending_buffer(adapter) &&
1140 napi_reschedule(napi)) {
1141 lpar_rc = h_vio_signal(adapter->vdev->unit_address,
1142 VIO_IRQ_DISABLE);
1143 goto restart_poll;
1144 }
1145 }
1146
1147 return frames_processed;
1148}
1149
1150static irqreturn_t ibmveth_interrupt(int irq, void *dev_instance)
1151{
1152 struct net_device *netdev = dev_instance;
1153 struct ibmveth_adapter *adapter = netdev_priv(netdev);
1154 unsigned long lpar_rc;
1155
1156 if (napi_schedule_prep(&adapter->napi)) {
1157 lpar_rc = h_vio_signal(adapter->vdev->unit_address,
1158 VIO_IRQ_DISABLE);
1159 BUG_ON(lpar_rc != H_SUCCESS);
1160 __napi_schedule(&adapter->napi);
1161 }
1162 return IRQ_HANDLED;
1163}
1164
1165static void ibmveth_set_multicast_list(struct net_device *netdev)
1166{
1167 struct ibmveth_adapter *adapter = netdev_priv(netdev);
1168 unsigned long lpar_rc;
1169
1170 if ((netdev->flags & IFF_PROMISC) ||
1171 (netdev_mc_count(netdev) > adapter->mcastFilterSize)) {
1172 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1173 IbmVethMcastEnableRecv |
1174 IbmVethMcastDisableFiltering,
1175 0);
1176 if (lpar_rc != H_SUCCESS) {
1177 netdev_err(netdev, "h_multicast_ctrl rc=%ld when "
1178 "entering promisc mode\n", lpar_rc);
1179 }
1180 } else {
1181 struct netdev_hw_addr *ha;
1182 /* clear the filter table & disable filtering */
1183 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1184 IbmVethMcastEnableRecv |
1185 IbmVethMcastDisableFiltering |
1186 IbmVethMcastClearFilterTable,
1187 0);
1188 if (lpar_rc != H_SUCCESS) {
1189 netdev_err(netdev, "h_multicast_ctrl rc=%ld when "
1190 "attempting to clear filter table\n",
1191 lpar_rc);
1192 }
1193 /* add the addresses to the filter table */
1194 netdev_for_each_mc_addr(ha, netdev) {
1195 /* add the multicast address to the filter table */
1196 u64 mcast_addr;
1197 mcast_addr = ibmveth_encode_mac_addr(ha->addr);
1198 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1199 IbmVethMcastAddFilter,
1200 mcast_addr);
1201 if (lpar_rc != H_SUCCESS) {
1202 netdev_err(netdev, "h_multicast_ctrl rc=%ld "
1203 "when adding an entry to the filter "
1204 "table\n", lpar_rc);
1205 }
1206 }
1207
1208 /* re-enable filtering */
1209 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1210 IbmVethMcastEnableFiltering,
1211 0);
1212 if (lpar_rc != H_SUCCESS) {
1213 netdev_err(netdev, "h_multicast_ctrl rc=%ld when "
1214 "enabling filtering\n", lpar_rc);
1215 }
1216 }
1217}
1218
1219static int ibmveth_change_mtu(struct net_device *dev, int new_mtu)
1220{
1221 struct ibmveth_adapter *adapter = netdev_priv(dev);
1222 struct vio_dev *viodev = adapter->vdev;
1223 int new_mtu_oh = new_mtu + IBMVETH_BUFF_OH;
1224 int i, rc;
1225 int need_restart = 0;
1226
1227 if (new_mtu < IBMVETH_MIN_MTU)
1228 return -EINVAL;
1229
1230 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
1231 if (new_mtu_oh < adapter->rx_buff_pool[i].buff_size)
1232 break;
1233
1234 if (i == IBMVETH_NUM_BUFF_POOLS)
1235 return -EINVAL;
1236
1237 /* Deactivate all the buffer pools so that the next loop can activate
1238 only the buffer pools necessary to hold the new MTU */
1239 if (netif_running(adapter->netdev)) {
1240 need_restart = 1;
1241 adapter->pool_config = 1;
1242 ibmveth_close(adapter->netdev);
1243 adapter->pool_config = 0;
1244 }
1245
1246 /* Look for an active buffer pool that can hold the new MTU */
1247 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1248 adapter->rx_buff_pool[i].active = 1;
1249
1250 if (new_mtu_oh < adapter->rx_buff_pool[i].buff_size) {
1251 dev->mtu = new_mtu;
1252 vio_cmo_set_dev_desired(viodev,
1253 ibmveth_get_desired_dma
1254 (viodev));
1255 if (need_restart) {
1256 return ibmveth_open(adapter->netdev);
1257 }
1258 return 0;
1259 }
1260 }
1261
1262 if (need_restart && (rc = ibmveth_open(adapter->netdev)))
1263 return rc;
1264
1265 return -EINVAL;
1266}
1267
1268#ifdef CONFIG_NET_POLL_CONTROLLER
1269static void ibmveth_poll_controller(struct net_device *dev)
1270{
1271 ibmveth_replenish_task(netdev_priv(dev));
1272 ibmveth_interrupt(dev->irq, dev);
1273}
1274#endif
1275
1276/**
1277 * ibmveth_get_desired_dma - Calculate IO memory desired by the driver
1278 *
1279 * @vdev: struct vio_dev for the device whose desired IO mem is to be returned
1280 *
1281 * Return value:
1282 * Number of bytes of IO data the driver will need to perform well.
1283 */
1284static unsigned long ibmveth_get_desired_dma(struct vio_dev *vdev)
1285{
1286 struct net_device *netdev = dev_get_drvdata(&vdev->dev);
1287 struct ibmveth_adapter *adapter;
1288 struct iommu_table *tbl;
1289 unsigned long ret;
1290 int i;
1291 int rxqentries = 1;
1292
1293 tbl = get_iommu_table_base(&vdev->dev);
1294
1295 /* netdev inits at probe time along with the structures we need below*/
1296 if (netdev == NULL)
1297 return IOMMU_PAGE_ALIGN(IBMVETH_IO_ENTITLEMENT_DEFAULT, tbl);
1298
1299 adapter = netdev_priv(netdev);
1300
1301 ret = IBMVETH_BUFF_LIST_SIZE + IBMVETH_FILT_LIST_SIZE;
1302 ret += IOMMU_PAGE_ALIGN(netdev->mtu, tbl);
1303
1304 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1305 /* add the size of the active receive buffers */
1306 if (adapter->rx_buff_pool[i].active)
1307 ret +=
1308 adapter->rx_buff_pool[i].size *
1309 IOMMU_PAGE_ALIGN(adapter->rx_buff_pool[i].
1310 buff_size, tbl);
1311 rxqentries += adapter->rx_buff_pool[i].size;
1312 }
1313 /* add the size of the receive queue entries */
1314 ret += IOMMU_PAGE_ALIGN(
1315 rxqentries * sizeof(struct ibmveth_rx_q_entry), tbl);
1316
1317 return ret;
1318}
1319
1320static const struct net_device_ops ibmveth_netdev_ops = {
1321 .ndo_open = ibmveth_open,
1322 .ndo_stop = ibmveth_close,
1323 .ndo_start_xmit = ibmveth_start_xmit,
1324 .ndo_set_rx_mode = ibmveth_set_multicast_list,
1325 .ndo_do_ioctl = ibmveth_ioctl,
1326 .ndo_change_mtu = ibmveth_change_mtu,
1327 .ndo_fix_features = ibmveth_fix_features,
1328 .ndo_set_features = ibmveth_set_features,
1329 .ndo_validate_addr = eth_validate_addr,
1330 .ndo_set_mac_address = eth_mac_addr,
1331#ifdef CONFIG_NET_POLL_CONTROLLER
1332 .ndo_poll_controller = ibmveth_poll_controller,
1333#endif
1334};
1335
1336static int ibmveth_probe(struct vio_dev *dev, const struct vio_device_id *id)
1337{
1338 int rc, i, mac_len;
1339 struct net_device *netdev;
1340 struct ibmveth_adapter *adapter;
1341 unsigned char *mac_addr_p;
1342 unsigned int *mcastFilterSize_p;
1343
1344 dev_dbg(&dev->dev, "entering ibmveth_probe for UA 0x%x\n",
1345 dev->unit_address);
1346
1347 mac_addr_p = (unsigned char *)vio_get_attribute(dev, VETH_MAC_ADDR,
1348 &mac_len);
1349 if (!mac_addr_p) {
1350 dev_err(&dev->dev, "Can't find VETH_MAC_ADDR attribute\n");
1351 return -EINVAL;
1352 }
1353 /* Workaround for old/broken pHyp */
1354 if (mac_len == 8)
1355 mac_addr_p += 2;
1356 else if (mac_len != 6) {
1357 dev_err(&dev->dev, "VETH_MAC_ADDR attribute wrong len %d\n",
1358 mac_len);
1359 return -EINVAL;
1360 }
1361
1362 mcastFilterSize_p = (unsigned int *)vio_get_attribute(dev,
1363 VETH_MCAST_FILTER_SIZE, NULL);
1364 if (!mcastFilterSize_p) {
1365 dev_err(&dev->dev, "Can't find VETH_MCAST_FILTER_SIZE "
1366 "attribute\n");
1367 return -EINVAL;
1368 }
1369
1370 netdev = alloc_etherdev(sizeof(struct ibmveth_adapter));
1371
1372 if (!netdev)
1373 return -ENOMEM;
1374
1375 adapter = netdev_priv(netdev);
1376 dev_set_drvdata(&dev->dev, netdev);
1377
1378 adapter->vdev = dev;
1379 adapter->netdev = netdev;
1380 adapter->mcastFilterSize = *mcastFilterSize_p;
1381 adapter->pool_config = 0;
1382
1383 netif_napi_add(netdev, &adapter->napi, ibmveth_poll, 16);
1384
1385 netdev->irq = dev->irq;
1386 netdev->netdev_ops = &ibmveth_netdev_ops;
1387 netdev->ethtool_ops = &netdev_ethtool_ops;
1388 SET_NETDEV_DEV(netdev, &dev->dev);
1389 netdev->hw_features = NETIF_F_SG | NETIF_F_RXCSUM |
1390 NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;
1391 netdev->features |= netdev->hw_features;
1392
1393 memcpy(netdev->dev_addr, mac_addr_p, ETH_ALEN);
1394
1395 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1396 struct kobject *kobj = &adapter->rx_buff_pool[i].kobj;
1397 int error;
1398
1399 ibmveth_init_buffer_pool(&adapter->rx_buff_pool[i], i,
1400 pool_count[i], pool_size[i],
1401 pool_active[i]);
1402 error = kobject_init_and_add(kobj, &ktype_veth_pool,
1403 &dev->dev.kobj, "pool%d", i);
1404 if (!error)
1405 kobject_uevent(kobj, KOBJ_ADD);
1406 }
1407
1408 netdev_dbg(netdev, "adapter @ 0x%p\n", adapter);
1409
1410 adapter->buffer_list_dma = DMA_ERROR_CODE;
1411 adapter->filter_list_dma = DMA_ERROR_CODE;
1412 adapter->rx_queue.queue_dma = DMA_ERROR_CODE;
1413
1414 netdev_dbg(netdev, "registering netdev...\n");
1415
1416 ibmveth_set_features(netdev, netdev->features);
1417
1418 rc = register_netdev(netdev);
1419
1420 if (rc) {
1421 netdev_dbg(netdev, "failed to register netdev rc=%d\n", rc);
1422 free_netdev(netdev);
1423 return rc;
1424 }
1425
1426 netdev_dbg(netdev, "registered\n");
1427
1428 return 0;
1429}
1430
1431static int ibmveth_remove(struct vio_dev *dev)
1432{
1433 struct net_device *netdev = dev_get_drvdata(&dev->dev);
1434 struct ibmveth_adapter *adapter = netdev_priv(netdev);
1435 int i;
1436
1437 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
1438 kobject_put(&adapter->rx_buff_pool[i].kobj);
1439
1440 unregister_netdev(netdev);
1441
1442 free_netdev(netdev);
1443 dev_set_drvdata(&dev->dev, NULL);
1444
1445 return 0;
1446}
1447
1448static struct attribute veth_active_attr;
1449static struct attribute veth_num_attr;
1450static struct attribute veth_size_attr;
1451
1452static ssize_t veth_pool_show(struct kobject *kobj,
1453 struct attribute *attr, char *buf)
1454{
1455 struct ibmveth_buff_pool *pool = container_of(kobj,
1456 struct ibmveth_buff_pool,
1457 kobj);
1458
1459 if (attr == &veth_active_attr)
1460 return sprintf(buf, "%d\n", pool->active);
1461 else if (attr == &veth_num_attr)
1462 return sprintf(buf, "%d\n", pool->size);
1463 else if (attr == &veth_size_attr)
1464 return sprintf(buf, "%d\n", pool->buff_size);
1465 return 0;
1466}
1467
1468static ssize_t veth_pool_store(struct kobject *kobj, struct attribute *attr,
1469 const char *buf, size_t count)
1470{
1471 struct ibmveth_buff_pool *pool = container_of(kobj,
1472 struct ibmveth_buff_pool,
1473 kobj);
1474 struct net_device *netdev = dev_get_drvdata(
1475 container_of(kobj->parent, struct device, kobj));
1476 struct ibmveth_adapter *adapter = netdev_priv(netdev);
1477 long value = simple_strtol(buf, NULL, 10);
1478 long rc;
1479
1480 if (attr == &veth_active_attr) {
1481 if (value && !pool->active) {
1482 if (netif_running(netdev)) {
1483 if (ibmveth_alloc_buffer_pool(pool)) {
1484 netdev_err(netdev,
1485 "unable to alloc pool\n");
1486 return -ENOMEM;
1487 }
1488 pool->active = 1;
1489 adapter->pool_config = 1;
1490 ibmveth_close(netdev);
1491 adapter->pool_config = 0;
1492 if ((rc = ibmveth_open(netdev)))
1493 return rc;
1494 } else {
1495 pool->active = 1;
1496 }
1497 } else if (!value && pool->active) {
1498 int mtu = netdev->mtu + IBMVETH_BUFF_OH;
1499 int i;
1500 /* Make sure there is a buffer pool with buffers that
1501 can hold a packet of the size of the MTU */
1502 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1503 if (pool == &adapter->rx_buff_pool[i])
1504 continue;
1505 if (!adapter->rx_buff_pool[i].active)
1506 continue;
1507 if (mtu <= adapter->rx_buff_pool[i].buff_size)
1508 break;
1509 }
1510
1511 if (i == IBMVETH_NUM_BUFF_POOLS) {
1512 netdev_err(netdev, "no active pool >= MTU\n");
1513 return -EPERM;
1514 }
1515
1516 if (netif_running(netdev)) {
1517 adapter->pool_config = 1;
1518 ibmveth_close(netdev);
1519 pool->active = 0;
1520 adapter->pool_config = 0;
1521 if ((rc = ibmveth_open(netdev)))
1522 return rc;
1523 }
1524 pool->active = 0;
1525 }
1526 } else if (attr == &veth_num_attr) {
1527 if (value <= 0 || value > IBMVETH_MAX_POOL_COUNT) {
1528 return -EINVAL;
1529 } else {
1530 if (netif_running(netdev)) {
1531 adapter->pool_config = 1;
1532 ibmveth_close(netdev);
1533 adapter->pool_config = 0;
1534 pool->size = value;
1535 if ((rc = ibmveth_open(netdev)))
1536 return rc;
1537 } else {
1538 pool->size = value;
1539 }
1540 }
1541 } else if (attr == &veth_size_attr) {
1542 if (value <= IBMVETH_BUFF_OH || value > IBMVETH_MAX_BUF_SIZE) {
1543 return -EINVAL;
1544 } else {
1545 if (netif_running(netdev)) {
1546 adapter->pool_config = 1;
1547 ibmveth_close(netdev);
1548 adapter->pool_config = 0;
1549 pool->buff_size = value;
1550 if ((rc = ibmveth_open(netdev)))
1551 return rc;
1552 } else {
1553 pool->buff_size = value;
1554 }
1555 }
1556 }
1557
1558 /* kick the interrupt handler to allocate/deallocate pools */
1559 ibmveth_interrupt(netdev->irq, netdev);
1560 return count;
1561}
1562
1563
1564#define ATTR(_name, _mode) \
1565 struct attribute veth_##_name##_attr = { \
1566 .name = __stringify(_name), .mode = _mode, \
1567 };
1568
1569static ATTR(active, 0644);
1570static ATTR(num, 0644);
1571static ATTR(size, 0644);
1572
1573static struct attribute *veth_pool_attrs[] = {
1574 &veth_active_attr,
1575 &veth_num_attr,
1576 &veth_size_attr,
1577 NULL,
1578};
1579
1580static const struct sysfs_ops veth_pool_ops = {
1581 .show = veth_pool_show,
1582 .store = veth_pool_store,
1583};
1584
1585static struct kobj_type ktype_veth_pool = {
1586 .release = NULL,
1587 .sysfs_ops = &veth_pool_ops,
1588 .default_attrs = veth_pool_attrs,
1589};
1590
1591static int ibmveth_resume(struct device *dev)
1592{
1593 struct net_device *netdev = dev_get_drvdata(dev);
1594 ibmveth_interrupt(netdev->irq, netdev);
1595 return 0;
1596}
1597
1598static struct vio_device_id ibmveth_device_table[] = {
1599 { "network", "IBM,l-lan"},
1600 { "", "" }
1601};
1602MODULE_DEVICE_TABLE(vio, ibmveth_device_table);
1603
1604static struct dev_pm_ops ibmveth_pm_ops = {
1605 .resume = ibmveth_resume
1606};
1607
1608static struct vio_driver ibmveth_driver = {
1609 .id_table = ibmveth_device_table,
1610 .probe = ibmveth_probe,
1611 .remove = ibmveth_remove,
1612 .get_desired_dma = ibmveth_get_desired_dma,
1613 .name = ibmveth_driver_name,
1614 .pm = &ibmveth_pm_ops,
1615};
1616
1617static int __init ibmveth_module_init(void)
1618{
1619 printk(KERN_DEBUG "%s: %s %s\n", ibmveth_driver_name,
1620 ibmveth_driver_string, ibmveth_driver_version);
1621
1622 return vio_register_driver(&ibmveth_driver);
1623}
1624
1625static void __exit ibmveth_module_exit(void)
1626{
1627 vio_unregister_driver(&ibmveth_driver);
1628}
1629
1630module_init(ibmveth_module_init);
1631module_exit(ibmveth_module_exit);