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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, write to the Free Software
16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
17 *
18 * Copyright (C) IBM Corporation, 2003, 2010
19 *
20 * Authors: Dave Larson <larson1@us.ibm.com>
21 * Santiago Leon <santil@linux.vnet.ibm.com>
22 * Brian King <brking@linux.vnet.ibm.com>
23 * Robert Jennings <rcj@linux.vnet.ibm.com>
24 * Anton Blanchard <anton@au.ibm.com>
25 */
26
27#include <linux/module.h>
28#include <linux/moduleparam.h>
29#include <linux/types.h>
30#include <linux/errno.h>
31#include <linux/dma-mapping.h>
32#include <linux/kernel.h>
33#include <linux/netdevice.h>
34#include <linux/etherdevice.h>
35#include <linux/skbuff.h>
36#include <linux/init.h>
37#include <linux/interrupt.h>
38#include <linux/mm.h>
39#include <linux/pm.h>
40#include <linux/ethtool.h>
41#include <linux/in.h>
42#include <linux/ip.h>
43#include <linux/ipv6.h>
44#include <linux/slab.h>
45#include <asm/hvcall.h>
46#include <linux/atomic.h>
47#include <asm/vio.h>
48#include <asm/iommu.h>
49#include <asm/firmware.h>
50
51#include "ibmveth.h"
52
53static irqreturn_t ibmveth_interrupt(int irq, void *dev_instance);
54static void ibmveth_rxq_harvest_buffer(struct ibmveth_adapter *adapter);
55static unsigned long ibmveth_get_desired_dma(struct vio_dev *vdev);
56
57static struct kobj_type ktype_veth_pool;
58
59
60static const char ibmveth_driver_name[] = "ibmveth";
61static const char ibmveth_driver_string[] = "IBM Power Virtual Ethernet Driver";
62#define ibmveth_driver_version "1.04"
63
64MODULE_AUTHOR("Santiago Leon <santil@linux.vnet.ibm.com>");
65MODULE_DESCRIPTION("IBM Power Virtual Ethernet Driver");
66MODULE_LICENSE("GPL");
67MODULE_VERSION(ibmveth_driver_version);
68
69static unsigned int tx_copybreak __read_mostly = 128;
70module_param(tx_copybreak, uint, 0644);
71MODULE_PARM_DESC(tx_copybreak,
72 "Maximum size of packet that is copied to a new buffer on transmit");
73
74static unsigned int rx_copybreak __read_mostly = 128;
75module_param(rx_copybreak, uint, 0644);
76MODULE_PARM_DESC(rx_copybreak,
77 "Maximum size of packet that is copied to a new buffer on receive");
78
79static unsigned int rx_flush __read_mostly = 0;
80module_param(rx_flush, uint, 0644);
81MODULE_PARM_DESC(rx_flush, "Flush receive buffers before use");
82
83struct ibmveth_stat {
84 char name[ETH_GSTRING_LEN];
85 int offset;
86};
87
88#define IBMVETH_STAT_OFF(stat) offsetof(struct ibmveth_adapter, stat)
89#define IBMVETH_GET_STAT(a, off) *((u64 *)(((unsigned long)(a)) + off))
90
91struct ibmveth_stat ibmveth_stats[] = {
92 { "replenish_task_cycles", IBMVETH_STAT_OFF(replenish_task_cycles) },
93 { "replenish_no_mem", IBMVETH_STAT_OFF(replenish_no_mem) },
94 { "replenish_add_buff_failure",
95 IBMVETH_STAT_OFF(replenish_add_buff_failure) },
96 { "replenish_add_buff_success",
97 IBMVETH_STAT_OFF(replenish_add_buff_success) },
98 { "rx_invalid_buffer", IBMVETH_STAT_OFF(rx_invalid_buffer) },
99 { "rx_no_buffer", IBMVETH_STAT_OFF(rx_no_buffer) },
100 { "tx_map_failed", IBMVETH_STAT_OFF(tx_map_failed) },
101 { "tx_send_failed", IBMVETH_STAT_OFF(tx_send_failed) },
102 { "fw_enabled_ipv4_csum", IBMVETH_STAT_OFF(fw_ipv4_csum_support) },
103 { "fw_enabled_ipv6_csum", IBMVETH_STAT_OFF(fw_ipv6_csum_support) },
104};
105
106/* simple methods of getting data from the current rxq entry */
107static inline u32 ibmveth_rxq_flags(struct ibmveth_adapter *adapter)
108{
109 return adapter->rx_queue.queue_addr[adapter->rx_queue.index].flags_off;
110}
111
112static inline int ibmveth_rxq_toggle(struct ibmveth_adapter *adapter)
113{
114 return (ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_TOGGLE) >>
115 IBMVETH_RXQ_TOGGLE_SHIFT;
116}
117
118static inline int ibmveth_rxq_pending_buffer(struct ibmveth_adapter *adapter)
119{
120 return ibmveth_rxq_toggle(adapter) == adapter->rx_queue.toggle;
121}
122
123static inline int ibmveth_rxq_buffer_valid(struct ibmveth_adapter *adapter)
124{
125 return ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_VALID;
126}
127
128static inline int ibmveth_rxq_frame_offset(struct ibmveth_adapter *adapter)
129{
130 return ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_OFF_MASK;
131}
132
133static inline int ibmveth_rxq_frame_length(struct ibmveth_adapter *adapter)
134{
135 return adapter->rx_queue.queue_addr[adapter->rx_queue.index].length;
136}
137
138static inline int ibmveth_rxq_csum_good(struct ibmveth_adapter *adapter)
139{
140 return ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_CSUM_GOOD;
141}
142
143/* setup the initial settings for a buffer pool */
144static void ibmveth_init_buffer_pool(struct ibmveth_buff_pool *pool,
145 u32 pool_index, u32 pool_size,
146 u32 buff_size, u32 pool_active)
147{
148 pool->size = pool_size;
149 pool->index = pool_index;
150 pool->buff_size = buff_size;
151 pool->threshold = pool_size * 7 / 8;
152 pool->active = pool_active;
153}
154
155/* allocate and setup an buffer pool - called during open */
156static int ibmveth_alloc_buffer_pool(struct ibmveth_buff_pool *pool)
157{
158 int i;
159
160 pool->free_map = kmalloc(sizeof(u16) * pool->size, GFP_KERNEL);
161
162 if (!pool->free_map)
163 return -1;
164
165 pool->dma_addr = kmalloc(sizeof(dma_addr_t) * pool->size, GFP_KERNEL);
166 if (!pool->dma_addr) {
167 kfree(pool->free_map);
168 pool->free_map = NULL;
169 return -1;
170 }
171
172 pool->skbuff = kcalloc(pool->size, sizeof(void *), GFP_KERNEL);
173
174 if (!pool->skbuff) {
175 kfree(pool->dma_addr);
176 pool->dma_addr = NULL;
177
178 kfree(pool->free_map);
179 pool->free_map = NULL;
180 return -1;
181 }
182
183 memset(pool->dma_addr, 0, sizeof(dma_addr_t) * pool->size);
184
185 for (i = 0; i < pool->size; ++i)
186 pool->free_map[i] = i;
187
188 atomic_set(&pool->available, 0);
189 pool->producer_index = 0;
190 pool->consumer_index = 0;
191
192 return 0;
193}
194
195static inline void ibmveth_flush_buffer(void *addr, unsigned long length)
196{
197 unsigned long offset;
198
199 for (offset = 0; offset < length; offset += SMP_CACHE_BYTES)
200 asm("dcbfl %0,%1" :: "b" (addr), "r" (offset));
201}
202
203/* replenish the buffers for a pool. note that we don't need to
204 * skb_reserve these since they are used for incoming...
205 */
206static void ibmveth_replenish_buffer_pool(struct ibmveth_adapter *adapter,
207 struct ibmveth_buff_pool *pool)
208{
209 u32 i;
210 u32 count = pool->size - atomic_read(&pool->available);
211 u32 buffers_added = 0;
212 struct sk_buff *skb;
213 unsigned int free_index, index;
214 u64 correlator;
215 unsigned long lpar_rc;
216 dma_addr_t dma_addr;
217
218 mb();
219
220 for (i = 0; i < count; ++i) {
221 union ibmveth_buf_desc desc;
222
223 skb = netdev_alloc_skb(adapter->netdev, pool->buff_size);
224
225 if (!skb) {
226 netdev_dbg(adapter->netdev,
227 "replenish: unable to allocate skb\n");
228 adapter->replenish_no_mem++;
229 break;
230 }
231
232 free_index = pool->consumer_index;
233 pool->consumer_index++;
234 if (pool->consumer_index >= pool->size)
235 pool->consumer_index = 0;
236 index = pool->free_map[free_index];
237
238 BUG_ON(index == IBM_VETH_INVALID_MAP);
239 BUG_ON(pool->skbuff[index] != NULL);
240
241 dma_addr = dma_map_single(&adapter->vdev->dev, skb->data,
242 pool->buff_size, DMA_FROM_DEVICE);
243
244 if (dma_mapping_error(&adapter->vdev->dev, dma_addr))
245 goto failure;
246
247 pool->free_map[free_index] = IBM_VETH_INVALID_MAP;
248 pool->dma_addr[index] = dma_addr;
249 pool->skbuff[index] = skb;
250
251 correlator = ((u64)pool->index << 32) | index;
252 *(u64 *)skb->data = correlator;
253
254 desc.fields.flags_len = IBMVETH_BUF_VALID | pool->buff_size;
255 desc.fields.address = dma_addr;
256
257 if (rx_flush) {
258 unsigned int len = min(pool->buff_size,
259 adapter->netdev->mtu +
260 IBMVETH_BUFF_OH);
261 ibmveth_flush_buffer(skb->data, len);
262 }
263 lpar_rc = h_add_logical_lan_buffer(adapter->vdev->unit_address,
264 desc.desc);
265
266 if (lpar_rc != H_SUCCESS) {
267 goto failure;
268 } else {
269 buffers_added++;
270 adapter->replenish_add_buff_success++;
271 }
272 }
273
274 mb();
275 atomic_add(buffers_added, &(pool->available));
276 return;
277
278failure:
279 pool->free_map[free_index] = index;
280 pool->skbuff[index] = NULL;
281 if (pool->consumer_index == 0)
282 pool->consumer_index = pool->size - 1;
283 else
284 pool->consumer_index--;
285 if (!dma_mapping_error(&adapter->vdev->dev, dma_addr))
286 dma_unmap_single(&adapter->vdev->dev,
287 pool->dma_addr[index], pool->buff_size,
288 DMA_FROM_DEVICE);
289 dev_kfree_skb_any(skb);
290 adapter->replenish_add_buff_failure++;
291
292 mb();
293 atomic_add(buffers_added, &(pool->available));
294}
295
296/* replenish routine */
297static void ibmveth_replenish_task(struct ibmveth_adapter *adapter)
298{
299 int i;
300
301 adapter->replenish_task_cycles++;
302
303 for (i = (IBMVETH_NUM_BUFF_POOLS - 1); i >= 0; i--) {
304 struct ibmveth_buff_pool *pool = &adapter->rx_buff_pool[i];
305
306 if (pool->active &&
307 (atomic_read(&pool->available) < pool->threshold))
308 ibmveth_replenish_buffer_pool(adapter, pool);
309 }
310
311 adapter->rx_no_buffer = *(u64 *)(((char*)adapter->buffer_list_addr) +
312 4096 - 8);
313}
314
315/* empty and free ana buffer pool - also used to do cleanup in error paths */
316static void ibmveth_free_buffer_pool(struct ibmveth_adapter *adapter,
317 struct ibmveth_buff_pool *pool)
318{
319 int i;
320
321 kfree(pool->free_map);
322 pool->free_map = NULL;
323
324 if (pool->skbuff && pool->dma_addr) {
325 for (i = 0; i < pool->size; ++i) {
326 struct sk_buff *skb = pool->skbuff[i];
327 if (skb) {
328 dma_unmap_single(&adapter->vdev->dev,
329 pool->dma_addr[i],
330 pool->buff_size,
331 DMA_FROM_DEVICE);
332 dev_kfree_skb_any(skb);
333 pool->skbuff[i] = NULL;
334 }
335 }
336 }
337
338 if (pool->dma_addr) {
339 kfree(pool->dma_addr);
340 pool->dma_addr = NULL;
341 }
342
343 if (pool->skbuff) {
344 kfree(pool->skbuff);
345 pool->skbuff = NULL;
346 }
347}
348
349/* remove a buffer from a pool */
350static void ibmveth_remove_buffer_from_pool(struct ibmveth_adapter *adapter,
351 u64 correlator)
352{
353 unsigned int pool = correlator >> 32;
354 unsigned int index = correlator & 0xffffffffUL;
355 unsigned int free_index;
356 struct sk_buff *skb;
357
358 BUG_ON(pool >= IBMVETH_NUM_BUFF_POOLS);
359 BUG_ON(index >= adapter->rx_buff_pool[pool].size);
360
361 skb = adapter->rx_buff_pool[pool].skbuff[index];
362
363 BUG_ON(skb == NULL);
364
365 adapter->rx_buff_pool[pool].skbuff[index] = NULL;
366
367 dma_unmap_single(&adapter->vdev->dev,
368 adapter->rx_buff_pool[pool].dma_addr[index],
369 adapter->rx_buff_pool[pool].buff_size,
370 DMA_FROM_DEVICE);
371
372 free_index = adapter->rx_buff_pool[pool].producer_index;
373 adapter->rx_buff_pool[pool].producer_index++;
374 if (adapter->rx_buff_pool[pool].producer_index >=
375 adapter->rx_buff_pool[pool].size)
376 adapter->rx_buff_pool[pool].producer_index = 0;
377 adapter->rx_buff_pool[pool].free_map[free_index] = index;
378
379 mb();
380
381 atomic_dec(&(adapter->rx_buff_pool[pool].available));
382}
383
384/* get the current buffer on the rx queue */
385static inline struct sk_buff *ibmveth_rxq_get_buffer(struct ibmveth_adapter *adapter)
386{
387 u64 correlator = adapter->rx_queue.queue_addr[adapter->rx_queue.index].correlator;
388 unsigned int pool = correlator >> 32;
389 unsigned int index = correlator & 0xffffffffUL;
390
391 BUG_ON(pool >= IBMVETH_NUM_BUFF_POOLS);
392 BUG_ON(index >= adapter->rx_buff_pool[pool].size);
393
394 return adapter->rx_buff_pool[pool].skbuff[index];
395}
396
397/* recycle the current buffer on the rx queue */
398static int ibmveth_rxq_recycle_buffer(struct ibmveth_adapter *adapter)
399{
400 u32 q_index = adapter->rx_queue.index;
401 u64 correlator = adapter->rx_queue.queue_addr[q_index].correlator;
402 unsigned int pool = correlator >> 32;
403 unsigned int index = correlator & 0xffffffffUL;
404 union ibmveth_buf_desc desc;
405 unsigned long lpar_rc;
406 int ret = 1;
407
408 BUG_ON(pool >= IBMVETH_NUM_BUFF_POOLS);
409 BUG_ON(index >= adapter->rx_buff_pool[pool].size);
410
411 if (!adapter->rx_buff_pool[pool].active) {
412 ibmveth_rxq_harvest_buffer(adapter);
413 ibmveth_free_buffer_pool(adapter, &adapter->rx_buff_pool[pool]);
414 goto out;
415 }
416
417 desc.fields.flags_len = IBMVETH_BUF_VALID |
418 adapter->rx_buff_pool[pool].buff_size;
419 desc.fields.address = adapter->rx_buff_pool[pool].dma_addr[index];
420
421 lpar_rc = h_add_logical_lan_buffer(adapter->vdev->unit_address, desc.desc);
422
423 if (lpar_rc != H_SUCCESS) {
424 netdev_dbg(adapter->netdev, "h_add_logical_lan_buffer failed "
425 "during recycle rc=%ld", lpar_rc);
426 ibmveth_remove_buffer_from_pool(adapter, adapter->rx_queue.queue_addr[adapter->rx_queue.index].correlator);
427 ret = 0;
428 }
429
430 if (++adapter->rx_queue.index == adapter->rx_queue.num_slots) {
431 adapter->rx_queue.index = 0;
432 adapter->rx_queue.toggle = !adapter->rx_queue.toggle;
433 }
434
435out:
436 return ret;
437}
438
439static void ibmveth_rxq_harvest_buffer(struct ibmveth_adapter *adapter)
440{
441 ibmveth_remove_buffer_from_pool(adapter, adapter->rx_queue.queue_addr[adapter->rx_queue.index].correlator);
442
443 if (++adapter->rx_queue.index == adapter->rx_queue.num_slots) {
444 adapter->rx_queue.index = 0;
445 adapter->rx_queue.toggle = !adapter->rx_queue.toggle;
446 }
447}
448
449static void ibmveth_cleanup(struct ibmveth_adapter *adapter)
450{
451 int i;
452 struct device *dev = &adapter->vdev->dev;
453
454 if (adapter->buffer_list_addr != NULL) {
455 if (!dma_mapping_error(dev, adapter->buffer_list_dma)) {
456 dma_unmap_single(dev, adapter->buffer_list_dma, 4096,
457 DMA_BIDIRECTIONAL);
458 adapter->buffer_list_dma = DMA_ERROR_CODE;
459 }
460 free_page((unsigned long)adapter->buffer_list_addr);
461 adapter->buffer_list_addr = NULL;
462 }
463
464 if (adapter->filter_list_addr != NULL) {
465 if (!dma_mapping_error(dev, adapter->filter_list_dma)) {
466 dma_unmap_single(dev, adapter->filter_list_dma, 4096,
467 DMA_BIDIRECTIONAL);
468 adapter->filter_list_dma = DMA_ERROR_CODE;
469 }
470 free_page((unsigned long)adapter->filter_list_addr);
471 adapter->filter_list_addr = NULL;
472 }
473
474 if (adapter->rx_queue.queue_addr != NULL) {
475 dma_free_coherent(dev, adapter->rx_queue.queue_len,
476 adapter->rx_queue.queue_addr,
477 adapter->rx_queue.queue_dma);
478 adapter->rx_queue.queue_addr = NULL;
479 }
480
481 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
482 if (adapter->rx_buff_pool[i].active)
483 ibmveth_free_buffer_pool(adapter,
484 &adapter->rx_buff_pool[i]);
485
486 if (adapter->bounce_buffer != NULL) {
487 if (!dma_mapping_error(dev, adapter->bounce_buffer_dma)) {
488 dma_unmap_single(&adapter->vdev->dev,
489 adapter->bounce_buffer_dma,
490 adapter->netdev->mtu + IBMVETH_BUFF_OH,
491 DMA_BIDIRECTIONAL);
492 adapter->bounce_buffer_dma = DMA_ERROR_CODE;
493 }
494 kfree(adapter->bounce_buffer);
495 adapter->bounce_buffer = NULL;
496 }
497}
498
499static int ibmveth_register_logical_lan(struct ibmveth_adapter *adapter,
500 union ibmveth_buf_desc rxq_desc, u64 mac_address)
501{
502 int rc, try_again = 1;
503
504 /*
505 * After a kexec the adapter will still be open, so our attempt to
506 * open it will fail. So if we get a failure we free the adapter and
507 * try again, but only once.
508 */
509retry:
510 rc = h_register_logical_lan(adapter->vdev->unit_address,
511 adapter->buffer_list_dma, rxq_desc.desc,
512 adapter->filter_list_dma, mac_address);
513
514 if (rc != H_SUCCESS && try_again) {
515 do {
516 rc = h_free_logical_lan(adapter->vdev->unit_address);
517 } while (H_IS_LONG_BUSY(rc) || (rc == H_BUSY));
518
519 try_again = 0;
520 goto retry;
521 }
522
523 return rc;
524}
525
526static int ibmveth_open(struct net_device *netdev)
527{
528 struct ibmveth_adapter *adapter = netdev_priv(netdev);
529 u64 mac_address = 0;
530 int rxq_entries = 1;
531 unsigned long lpar_rc;
532 int rc;
533 union ibmveth_buf_desc rxq_desc;
534 int i;
535 struct device *dev;
536
537 netdev_dbg(netdev, "open starting\n");
538
539 napi_enable(&adapter->napi);
540
541 for(i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
542 rxq_entries += adapter->rx_buff_pool[i].size;
543
544 adapter->buffer_list_addr = (void*) get_zeroed_page(GFP_KERNEL);
545 adapter->filter_list_addr = (void*) get_zeroed_page(GFP_KERNEL);
546
547 if (!adapter->buffer_list_addr || !adapter->filter_list_addr) {
548 netdev_err(netdev, "unable to allocate filter or buffer list "
549 "pages\n");
550 rc = -ENOMEM;
551 goto err_out;
552 }
553
554 dev = &adapter->vdev->dev;
555
556 adapter->rx_queue.queue_len = sizeof(struct ibmveth_rx_q_entry) *
557 rxq_entries;
558 adapter->rx_queue.queue_addr =
559 dma_alloc_coherent(dev, adapter->rx_queue.queue_len,
560 &adapter->rx_queue.queue_dma, GFP_KERNEL);
561
562 if (!adapter->rx_queue.queue_addr) {
563 netdev_err(netdev, "unable to allocate rx queue pages\n");
564 rc = -ENOMEM;
565 goto err_out;
566 }
567
568 adapter->buffer_list_dma = dma_map_single(dev,
569 adapter->buffer_list_addr, 4096, DMA_BIDIRECTIONAL);
570 adapter->filter_list_dma = dma_map_single(dev,
571 adapter->filter_list_addr, 4096, DMA_BIDIRECTIONAL);
572
573 if ((dma_mapping_error(dev, adapter->buffer_list_dma)) ||
574 (dma_mapping_error(dev, adapter->filter_list_dma))) {
575 netdev_err(netdev, "unable to map filter or buffer list "
576 "pages\n");
577 rc = -ENOMEM;
578 goto err_out;
579 }
580
581 adapter->rx_queue.index = 0;
582 adapter->rx_queue.num_slots = rxq_entries;
583 adapter->rx_queue.toggle = 1;
584
585 memcpy(&mac_address, netdev->dev_addr, netdev->addr_len);
586 mac_address = mac_address >> 16;
587
588 rxq_desc.fields.flags_len = IBMVETH_BUF_VALID |
589 adapter->rx_queue.queue_len;
590 rxq_desc.fields.address = adapter->rx_queue.queue_dma;
591
592 netdev_dbg(netdev, "buffer list @ 0x%p\n", adapter->buffer_list_addr);
593 netdev_dbg(netdev, "filter list @ 0x%p\n", adapter->filter_list_addr);
594 netdev_dbg(netdev, "receive q @ 0x%p\n", adapter->rx_queue.queue_addr);
595
596 h_vio_signal(adapter->vdev->unit_address, VIO_IRQ_DISABLE);
597
598 lpar_rc = ibmveth_register_logical_lan(adapter, rxq_desc, mac_address);
599
600 if (lpar_rc != H_SUCCESS) {
601 netdev_err(netdev, "h_register_logical_lan failed with %ld\n",
602 lpar_rc);
603 netdev_err(netdev, "buffer TCE:0x%llx filter TCE:0x%llx rxq "
604 "desc:0x%llx MAC:0x%llx\n",
605 adapter->buffer_list_dma,
606 adapter->filter_list_dma,
607 rxq_desc.desc,
608 mac_address);
609 rc = -ENONET;
610 goto err_out;
611 }
612
613 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
614 if (!adapter->rx_buff_pool[i].active)
615 continue;
616 if (ibmveth_alloc_buffer_pool(&adapter->rx_buff_pool[i])) {
617 netdev_err(netdev, "unable to alloc pool\n");
618 adapter->rx_buff_pool[i].active = 0;
619 rc = -ENOMEM;
620 goto err_out;
621 }
622 }
623
624 netdev_dbg(netdev, "registering irq 0x%x\n", netdev->irq);
625 rc = request_irq(netdev->irq, ibmveth_interrupt, 0, netdev->name,
626 netdev);
627 if (rc != 0) {
628 netdev_err(netdev, "unable to request irq 0x%x, rc %d\n",
629 netdev->irq, rc);
630 do {
631 lpar_rc = h_free_logical_lan(adapter->vdev->unit_address);
632 } while (H_IS_LONG_BUSY(lpar_rc) || (lpar_rc == H_BUSY));
633
634 goto err_out;
635 }
636
637 adapter->bounce_buffer =
638 kmalloc(netdev->mtu + IBMVETH_BUFF_OH, GFP_KERNEL);
639 if (!adapter->bounce_buffer) {
640 netdev_err(netdev, "unable to allocate bounce buffer\n");
641 rc = -ENOMEM;
642 goto err_out_free_irq;
643 }
644 adapter->bounce_buffer_dma =
645 dma_map_single(&adapter->vdev->dev, adapter->bounce_buffer,
646 netdev->mtu + IBMVETH_BUFF_OH, DMA_BIDIRECTIONAL);
647 if (dma_mapping_error(dev, adapter->bounce_buffer_dma)) {
648 netdev_err(netdev, "unable to map bounce buffer\n");
649 rc = -ENOMEM;
650 goto err_out_free_irq;
651 }
652
653 netdev_dbg(netdev, "initial replenish cycle\n");
654 ibmveth_interrupt(netdev->irq, netdev);
655
656 netif_start_queue(netdev);
657
658 netdev_dbg(netdev, "open complete\n");
659
660 return 0;
661
662err_out_free_irq:
663 free_irq(netdev->irq, netdev);
664err_out:
665 ibmveth_cleanup(adapter);
666 napi_disable(&adapter->napi);
667 return rc;
668}
669
670static int ibmveth_close(struct net_device *netdev)
671{
672 struct ibmveth_adapter *adapter = netdev_priv(netdev);
673 long lpar_rc;
674
675 netdev_dbg(netdev, "close starting\n");
676
677 napi_disable(&adapter->napi);
678
679 if (!adapter->pool_config)
680 netif_stop_queue(netdev);
681
682 h_vio_signal(adapter->vdev->unit_address, VIO_IRQ_DISABLE);
683
684 do {
685 lpar_rc = h_free_logical_lan(adapter->vdev->unit_address);
686 } while (H_IS_LONG_BUSY(lpar_rc) || (lpar_rc == H_BUSY));
687
688 if (lpar_rc != H_SUCCESS) {
689 netdev_err(netdev, "h_free_logical_lan failed with %lx, "
690 "continuing with close\n", lpar_rc);
691 }
692
693 free_irq(netdev->irq, netdev);
694
695 adapter->rx_no_buffer = *(u64 *)(((char *)adapter->buffer_list_addr) +
696 4096 - 8);
697
698 ibmveth_cleanup(adapter);
699
700 netdev_dbg(netdev, "close complete\n");
701
702 return 0;
703}
704
705static int netdev_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
706{
707 cmd->supported = (SUPPORTED_1000baseT_Full | SUPPORTED_Autoneg |
708 SUPPORTED_FIBRE);
709 cmd->advertising = (ADVERTISED_1000baseT_Full | ADVERTISED_Autoneg |
710 ADVERTISED_FIBRE);
711 ethtool_cmd_speed_set(cmd, SPEED_1000);
712 cmd->duplex = DUPLEX_FULL;
713 cmd->port = PORT_FIBRE;
714 cmd->phy_address = 0;
715 cmd->transceiver = XCVR_INTERNAL;
716 cmd->autoneg = AUTONEG_ENABLE;
717 cmd->maxtxpkt = 0;
718 cmd->maxrxpkt = 1;
719 return 0;
720}
721
722static void netdev_get_drvinfo(struct net_device *dev,
723 struct ethtool_drvinfo *info)
724{
725 strncpy(info->driver, ibmveth_driver_name, sizeof(info->driver) - 1);
726 strncpy(info->version, ibmveth_driver_version,
727 sizeof(info->version) - 1);
728}
729
730static netdev_features_t ibmveth_fix_features(struct net_device *dev,
731 netdev_features_t features)
732{
733 /*
734 * Since the ibmveth firmware interface does not have the
735 * concept of separate tx/rx checksum offload enable, if rx
736 * checksum is disabled we also have to disable tx checksum
737 * offload. Once we disable rx checksum offload, we are no
738 * longer allowed to send tx buffers that are not properly
739 * checksummed.
740 */
741
742 if (!(features & NETIF_F_RXCSUM))
743 features &= ~NETIF_F_ALL_CSUM;
744
745 return features;
746}
747
748static int ibmveth_set_csum_offload(struct net_device *dev, u32 data)
749{
750 struct ibmveth_adapter *adapter = netdev_priv(dev);
751 unsigned long set_attr, clr_attr, ret_attr;
752 unsigned long set_attr6, clr_attr6;
753 long ret, ret4, ret6;
754 int rc1 = 0, rc2 = 0;
755 int restart = 0;
756
757 if (netif_running(dev)) {
758 restart = 1;
759 adapter->pool_config = 1;
760 ibmveth_close(dev);
761 adapter->pool_config = 0;
762 }
763
764 set_attr = 0;
765 clr_attr = 0;
766 set_attr6 = 0;
767 clr_attr6 = 0;
768
769 if (data) {
770 set_attr = IBMVETH_ILLAN_IPV4_TCP_CSUM;
771 set_attr6 = IBMVETH_ILLAN_IPV6_TCP_CSUM;
772 } else {
773 clr_attr = IBMVETH_ILLAN_IPV4_TCP_CSUM;
774 clr_attr6 = IBMVETH_ILLAN_IPV6_TCP_CSUM;
775 }
776
777 ret = h_illan_attributes(adapter->vdev->unit_address, 0, 0, &ret_attr);
778
779 if (ret == H_SUCCESS && !(ret_attr & IBMVETH_ILLAN_ACTIVE_TRUNK) &&
780 !(ret_attr & IBMVETH_ILLAN_TRUNK_PRI_MASK) &&
781 (ret_attr & IBMVETH_ILLAN_PADDED_PKT_CSUM)) {
782 ret4 = h_illan_attributes(adapter->vdev->unit_address, clr_attr,
783 set_attr, &ret_attr);
784
785 if (ret4 != H_SUCCESS) {
786 netdev_err(dev, "unable to change IPv4 checksum "
787 "offload settings. %d rc=%ld\n",
788 data, ret4);
789
790 h_illan_attributes(adapter->vdev->unit_address,
791 set_attr, clr_attr, &ret_attr);
792
793 if (data == 1)
794 dev->features &= ~NETIF_F_IP_CSUM;
795
796 } else {
797 adapter->fw_ipv4_csum_support = data;
798 }
799
800 ret6 = h_illan_attributes(adapter->vdev->unit_address,
801 clr_attr6, set_attr6, &ret_attr);
802
803 if (ret6 != H_SUCCESS) {
804 netdev_err(dev, "unable to change IPv6 checksum "
805 "offload settings. %d rc=%ld\n",
806 data, ret6);
807
808 h_illan_attributes(adapter->vdev->unit_address,
809 set_attr6, clr_attr6, &ret_attr);
810
811 if (data == 1)
812 dev->features &= ~NETIF_F_IPV6_CSUM;
813
814 } else
815 adapter->fw_ipv6_csum_support = data;
816
817 if (ret4 == H_SUCCESS || ret6 == H_SUCCESS)
818 adapter->rx_csum = data;
819 else
820 rc1 = -EIO;
821 } else {
822 rc1 = -EIO;
823 netdev_err(dev, "unable to change checksum offload settings."
824 " %d rc=%ld ret_attr=%lx\n", data, ret,
825 ret_attr);
826 }
827
828 if (restart)
829 rc2 = ibmveth_open(dev);
830
831 return rc1 ? rc1 : rc2;
832}
833
834static int ibmveth_set_features(struct net_device *dev,
835 netdev_features_t features)
836{
837 struct ibmveth_adapter *adapter = netdev_priv(dev);
838 int rx_csum = !!(features & NETIF_F_RXCSUM);
839 int rc;
840
841 if (rx_csum == adapter->rx_csum)
842 return 0;
843
844 rc = ibmveth_set_csum_offload(dev, rx_csum);
845 if (rc && !adapter->rx_csum)
846 dev->features = features & ~(NETIF_F_ALL_CSUM | NETIF_F_RXCSUM);
847
848 return rc;
849}
850
851static void ibmveth_get_strings(struct net_device *dev, u32 stringset, u8 *data)
852{
853 int i;
854
855 if (stringset != ETH_SS_STATS)
856 return;
857
858 for (i = 0; i < ARRAY_SIZE(ibmveth_stats); i++, data += ETH_GSTRING_LEN)
859 memcpy(data, ibmveth_stats[i].name, ETH_GSTRING_LEN);
860}
861
862static int ibmveth_get_sset_count(struct net_device *dev, int sset)
863{
864 switch (sset) {
865 case ETH_SS_STATS:
866 return ARRAY_SIZE(ibmveth_stats);
867 default:
868 return -EOPNOTSUPP;
869 }
870}
871
872static void ibmveth_get_ethtool_stats(struct net_device *dev,
873 struct ethtool_stats *stats, u64 *data)
874{
875 int i;
876 struct ibmveth_adapter *adapter = netdev_priv(dev);
877
878 for (i = 0; i < ARRAY_SIZE(ibmveth_stats); i++)
879 data[i] = IBMVETH_GET_STAT(adapter, ibmveth_stats[i].offset);
880}
881
882static const struct ethtool_ops netdev_ethtool_ops = {
883 .get_drvinfo = netdev_get_drvinfo,
884 .get_settings = netdev_get_settings,
885 .get_link = ethtool_op_get_link,
886 .get_strings = ibmveth_get_strings,
887 .get_sset_count = ibmveth_get_sset_count,
888 .get_ethtool_stats = ibmveth_get_ethtool_stats,
889};
890
891static int ibmveth_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
892{
893 return -EOPNOTSUPP;
894}
895
896#define page_offset(v) ((unsigned long)(v) & ((1 << 12) - 1))
897
898static int ibmveth_send(struct ibmveth_adapter *adapter,
899 union ibmveth_buf_desc *descs)
900{
901 unsigned long correlator;
902 unsigned int retry_count;
903 unsigned long ret;
904
905 /*
906 * The retry count sets a maximum for the number of broadcast and
907 * multicast destinations within the system.
908 */
909 retry_count = 1024;
910 correlator = 0;
911 do {
912 ret = h_send_logical_lan(adapter->vdev->unit_address,
913 descs[0].desc, descs[1].desc,
914 descs[2].desc, descs[3].desc,
915 descs[4].desc, descs[5].desc,
916 correlator, &correlator);
917 } while ((ret == H_BUSY) && (retry_count--));
918
919 if (ret != H_SUCCESS && ret != H_DROPPED) {
920 netdev_err(adapter->netdev, "tx: h_send_logical_lan failed "
921 "with rc=%ld\n", ret);
922 return 1;
923 }
924
925 return 0;
926}
927
928static netdev_tx_t ibmveth_start_xmit(struct sk_buff *skb,
929 struct net_device *netdev)
930{
931 struct ibmveth_adapter *adapter = netdev_priv(netdev);
932 unsigned int desc_flags;
933 union ibmveth_buf_desc descs[6];
934 int last, i;
935 int force_bounce = 0;
936 dma_addr_t dma_addr;
937
938 /*
939 * veth handles a maximum of 6 segments including the header, so
940 * we have to linearize the skb if there are more than this.
941 */
942 if (skb_shinfo(skb)->nr_frags > 5 && __skb_linearize(skb)) {
943 netdev->stats.tx_dropped++;
944 goto out;
945 }
946
947 /* veth can't checksum offload UDP */
948 if (skb->ip_summed == CHECKSUM_PARTIAL &&
949 ((skb->protocol == htons(ETH_P_IP) &&
950 ip_hdr(skb)->protocol != IPPROTO_TCP) ||
951 (skb->protocol == htons(ETH_P_IPV6) &&
952 ipv6_hdr(skb)->nexthdr != IPPROTO_TCP)) &&
953 skb_checksum_help(skb)) {
954
955 netdev_err(netdev, "tx: failed to checksum packet\n");
956 netdev->stats.tx_dropped++;
957 goto out;
958 }
959
960 desc_flags = IBMVETH_BUF_VALID;
961
962 if (skb->ip_summed == CHECKSUM_PARTIAL) {
963 unsigned char *buf = skb_transport_header(skb) +
964 skb->csum_offset;
965
966 desc_flags |= (IBMVETH_BUF_NO_CSUM | IBMVETH_BUF_CSUM_GOOD);
967
968 /* Need to zero out the checksum */
969 buf[0] = 0;
970 buf[1] = 0;
971 }
972
973retry_bounce:
974 memset(descs, 0, sizeof(descs));
975
976 /*
977 * If a linear packet is below the rx threshold then
978 * copy it into the static bounce buffer. This avoids the
979 * cost of a TCE insert and remove.
980 */
981 if (force_bounce || (!skb_is_nonlinear(skb) &&
982 (skb->len < tx_copybreak))) {
983 skb_copy_from_linear_data(skb, adapter->bounce_buffer,
984 skb->len);
985
986 descs[0].fields.flags_len = desc_flags | skb->len;
987 descs[0].fields.address = adapter->bounce_buffer_dma;
988
989 if (ibmveth_send(adapter, descs)) {
990 adapter->tx_send_failed++;
991 netdev->stats.tx_dropped++;
992 } else {
993 netdev->stats.tx_packets++;
994 netdev->stats.tx_bytes += skb->len;
995 }
996
997 goto out;
998 }
999
1000 /* Map the header */
1001 dma_addr = dma_map_single(&adapter->vdev->dev, skb->data,
1002 skb_headlen(skb), DMA_TO_DEVICE);
1003 if (dma_mapping_error(&adapter->vdev->dev, dma_addr))
1004 goto map_failed;
1005
1006 descs[0].fields.flags_len = desc_flags | skb_headlen(skb);
1007 descs[0].fields.address = dma_addr;
1008
1009 /* Map the frags */
1010 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1011 const skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1012
1013 dma_addr = skb_frag_dma_map(&adapter->vdev->dev, frag, 0,
1014 skb_frag_size(frag), DMA_TO_DEVICE);
1015
1016 if (dma_mapping_error(&adapter->vdev->dev, dma_addr))
1017 goto map_failed_frags;
1018
1019 descs[i+1].fields.flags_len = desc_flags | skb_frag_size(frag);
1020 descs[i+1].fields.address = dma_addr;
1021 }
1022
1023 if (ibmveth_send(adapter, descs)) {
1024 adapter->tx_send_failed++;
1025 netdev->stats.tx_dropped++;
1026 } else {
1027 netdev->stats.tx_packets++;
1028 netdev->stats.tx_bytes += skb->len;
1029 }
1030
1031 dma_unmap_single(&adapter->vdev->dev,
1032 descs[0].fields.address,
1033 descs[0].fields.flags_len & IBMVETH_BUF_LEN_MASK,
1034 DMA_TO_DEVICE);
1035
1036 for (i = 1; i < skb_shinfo(skb)->nr_frags + 1; i++)
1037 dma_unmap_page(&adapter->vdev->dev, descs[i].fields.address,
1038 descs[i].fields.flags_len & IBMVETH_BUF_LEN_MASK,
1039 DMA_TO_DEVICE);
1040
1041out:
1042 dev_kfree_skb(skb);
1043 return NETDEV_TX_OK;
1044
1045map_failed_frags:
1046 last = i+1;
1047 for (i = 0; i < last; i++)
1048 dma_unmap_page(&adapter->vdev->dev, descs[i].fields.address,
1049 descs[i].fields.flags_len & IBMVETH_BUF_LEN_MASK,
1050 DMA_TO_DEVICE);
1051
1052map_failed:
1053 if (!firmware_has_feature(FW_FEATURE_CMO))
1054 netdev_err(netdev, "tx: unable to map xmit buffer\n");
1055 adapter->tx_map_failed++;
1056 skb_linearize(skb);
1057 force_bounce = 1;
1058 goto retry_bounce;
1059}
1060
1061static int ibmveth_poll(struct napi_struct *napi, int budget)
1062{
1063 struct ibmveth_adapter *adapter =
1064 container_of(napi, struct ibmveth_adapter, napi);
1065 struct net_device *netdev = adapter->netdev;
1066 int frames_processed = 0;
1067 unsigned long lpar_rc;
1068
1069restart_poll:
1070 do {
1071 if (!ibmveth_rxq_pending_buffer(adapter))
1072 break;
1073
1074 smp_rmb();
1075 if (!ibmveth_rxq_buffer_valid(adapter)) {
1076 wmb(); /* suggested by larson1 */
1077 adapter->rx_invalid_buffer++;
1078 netdev_dbg(netdev, "recycling invalid buffer\n");
1079 ibmveth_rxq_recycle_buffer(adapter);
1080 } else {
1081 struct sk_buff *skb, *new_skb;
1082 int length = ibmveth_rxq_frame_length(adapter);
1083 int offset = ibmveth_rxq_frame_offset(adapter);
1084 int csum_good = ibmveth_rxq_csum_good(adapter);
1085
1086 skb = ibmveth_rxq_get_buffer(adapter);
1087
1088 new_skb = NULL;
1089 if (length < rx_copybreak)
1090 new_skb = netdev_alloc_skb(netdev, length);
1091
1092 if (new_skb) {
1093 skb_copy_to_linear_data(new_skb,
1094 skb->data + offset,
1095 length);
1096 if (rx_flush)
1097 ibmveth_flush_buffer(skb->data,
1098 length + offset);
1099 if (!ibmveth_rxq_recycle_buffer(adapter))
1100 kfree_skb(skb);
1101 skb = new_skb;
1102 } else {
1103 ibmveth_rxq_harvest_buffer(adapter);
1104 skb_reserve(skb, offset);
1105 }
1106
1107 skb_put(skb, length);
1108 skb->protocol = eth_type_trans(skb, netdev);
1109
1110 if (csum_good)
1111 skb->ip_summed = CHECKSUM_UNNECESSARY;
1112
1113 netif_receive_skb(skb); /* send it up */
1114
1115 netdev->stats.rx_packets++;
1116 netdev->stats.rx_bytes += length;
1117 frames_processed++;
1118 }
1119 } while (frames_processed < budget);
1120
1121 ibmveth_replenish_task(adapter);
1122
1123 if (frames_processed < budget) {
1124 /* We think we are done - reenable interrupts,
1125 * then check once more to make sure we are done.
1126 */
1127 lpar_rc = h_vio_signal(adapter->vdev->unit_address,
1128 VIO_IRQ_ENABLE);
1129
1130 BUG_ON(lpar_rc != H_SUCCESS);
1131
1132 napi_complete(napi);
1133
1134 if (ibmveth_rxq_pending_buffer(adapter) &&
1135 napi_reschedule(napi)) {
1136 lpar_rc = h_vio_signal(adapter->vdev->unit_address,
1137 VIO_IRQ_DISABLE);
1138 goto restart_poll;
1139 }
1140 }
1141
1142 return frames_processed;
1143}
1144
1145static irqreturn_t ibmveth_interrupt(int irq, void *dev_instance)
1146{
1147 struct net_device *netdev = dev_instance;
1148 struct ibmveth_adapter *adapter = netdev_priv(netdev);
1149 unsigned long lpar_rc;
1150
1151 if (napi_schedule_prep(&adapter->napi)) {
1152 lpar_rc = h_vio_signal(adapter->vdev->unit_address,
1153 VIO_IRQ_DISABLE);
1154 BUG_ON(lpar_rc != H_SUCCESS);
1155 __napi_schedule(&adapter->napi);
1156 }
1157 return IRQ_HANDLED;
1158}
1159
1160static void ibmveth_set_multicast_list(struct net_device *netdev)
1161{
1162 struct ibmveth_adapter *adapter = netdev_priv(netdev);
1163 unsigned long lpar_rc;
1164
1165 if ((netdev->flags & IFF_PROMISC) ||
1166 (netdev_mc_count(netdev) > adapter->mcastFilterSize)) {
1167 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1168 IbmVethMcastEnableRecv |
1169 IbmVethMcastDisableFiltering,
1170 0);
1171 if (lpar_rc != H_SUCCESS) {
1172 netdev_err(netdev, "h_multicast_ctrl rc=%ld when "
1173 "entering promisc mode\n", lpar_rc);
1174 }
1175 } else {
1176 struct netdev_hw_addr *ha;
1177 /* clear the filter table & disable filtering */
1178 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1179 IbmVethMcastEnableRecv |
1180 IbmVethMcastDisableFiltering |
1181 IbmVethMcastClearFilterTable,
1182 0);
1183 if (lpar_rc != H_SUCCESS) {
1184 netdev_err(netdev, "h_multicast_ctrl rc=%ld when "
1185 "attempting to clear filter table\n",
1186 lpar_rc);
1187 }
1188 /* add the addresses to the filter table */
1189 netdev_for_each_mc_addr(ha, netdev) {
1190 /* add the multicast address to the filter table */
1191 unsigned long mcast_addr = 0;
1192 memcpy(((char *)&mcast_addr)+2, ha->addr, 6);
1193 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1194 IbmVethMcastAddFilter,
1195 mcast_addr);
1196 if (lpar_rc != H_SUCCESS) {
1197 netdev_err(netdev, "h_multicast_ctrl rc=%ld "
1198 "when adding an entry to the filter "
1199 "table\n", lpar_rc);
1200 }
1201 }
1202
1203 /* re-enable filtering */
1204 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1205 IbmVethMcastEnableFiltering,
1206 0);
1207 if (lpar_rc != H_SUCCESS) {
1208 netdev_err(netdev, "h_multicast_ctrl rc=%ld when "
1209 "enabling filtering\n", lpar_rc);
1210 }
1211 }
1212}
1213
1214static int ibmveth_change_mtu(struct net_device *dev, int new_mtu)
1215{
1216 struct ibmveth_adapter *adapter = netdev_priv(dev);
1217 struct vio_dev *viodev = adapter->vdev;
1218 int new_mtu_oh = new_mtu + IBMVETH_BUFF_OH;
1219 int i, rc;
1220 int need_restart = 0;
1221
1222 if (new_mtu < IBMVETH_MIN_MTU)
1223 return -EINVAL;
1224
1225 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
1226 if (new_mtu_oh < adapter->rx_buff_pool[i].buff_size)
1227 break;
1228
1229 if (i == IBMVETH_NUM_BUFF_POOLS)
1230 return -EINVAL;
1231
1232 /* Deactivate all the buffer pools so that the next loop can activate
1233 only the buffer pools necessary to hold the new MTU */
1234 if (netif_running(adapter->netdev)) {
1235 need_restart = 1;
1236 adapter->pool_config = 1;
1237 ibmveth_close(adapter->netdev);
1238 adapter->pool_config = 0;
1239 }
1240
1241 /* Look for an active buffer pool that can hold the new MTU */
1242 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1243 adapter->rx_buff_pool[i].active = 1;
1244
1245 if (new_mtu_oh < adapter->rx_buff_pool[i].buff_size) {
1246 dev->mtu = new_mtu;
1247 vio_cmo_set_dev_desired(viodev,
1248 ibmveth_get_desired_dma
1249 (viodev));
1250 if (need_restart) {
1251 return ibmveth_open(adapter->netdev);
1252 }
1253 return 0;
1254 }
1255 }
1256
1257 if (need_restart && (rc = ibmveth_open(adapter->netdev)))
1258 return rc;
1259
1260 return -EINVAL;
1261}
1262
1263#ifdef CONFIG_NET_POLL_CONTROLLER
1264static void ibmveth_poll_controller(struct net_device *dev)
1265{
1266 ibmveth_replenish_task(netdev_priv(dev));
1267 ibmveth_interrupt(dev->irq, dev);
1268}
1269#endif
1270
1271/**
1272 * ibmveth_get_desired_dma - Calculate IO memory desired by the driver
1273 *
1274 * @vdev: struct vio_dev for the device whose desired IO mem is to be returned
1275 *
1276 * Return value:
1277 * Number of bytes of IO data the driver will need to perform well.
1278 */
1279static unsigned long ibmveth_get_desired_dma(struct vio_dev *vdev)
1280{
1281 struct net_device *netdev = dev_get_drvdata(&vdev->dev);
1282 struct ibmveth_adapter *adapter;
1283 unsigned long ret;
1284 int i;
1285 int rxqentries = 1;
1286
1287 /* netdev inits at probe time along with the structures we need below*/
1288 if (netdev == NULL)
1289 return IOMMU_PAGE_ALIGN(IBMVETH_IO_ENTITLEMENT_DEFAULT);
1290
1291 adapter = netdev_priv(netdev);
1292
1293 ret = IBMVETH_BUFF_LIST_SIZE + IBMVETH_FILT_LIST_SIZE;
1294 ret += IOMMU_PAGE_ALIGN(netdev->mtu);
1295
1296 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1297 /* add the size of the active receive buffers */
1298 if (adapter->rx_buff_pool[i].active)
1299 ret +=
1300 adapter->rx_buff_pool[i].size *
1301 IOMMU_PAGE_ALIGN(adapter->rx_buff_pool[i].
1302 buff_size);
1303 rxqentries += adapter->rx_buff_pool[i].size;
1304 }
1305 /* add the size of the receive queue entries */
1306 ret += IOMMU_PAGE_ALIGN(rxqentries * sizeof(struct ibmveth_rx_q_entry));
1307
1308 return ret;
1309}
1310
1311static const struct net_device_ops ibmveth_netdev_ops = {
1312 .ndo_open = ibmveth_open,
1313 .ndo_stop = ibmveth_close,
1314 .ndo_start_xmit = ibmveth_start_xmit,
1315 .ndo_set_rx_mode = ibmveth_set_multicast_list,
1316 .ndo_do_ioctl = ibmveth_ioctl,
1317 .ndo_change_mtu = ibmveth_change_mtu,
1318 .ndo_fix_features = ibmveth_fix_features,
1319 .ndo_set_features = ibmveth_set_features,
1320 .ndo_validate_addr = eth_validate_addr,
1321 .ndo_set_mac_address = eth_mac_addr,
1322#ifdef CONFIG_NET_POLL_CONTROLLER
1323 .ndo_poll_controller = ibmveth_poll_controller,
1324#endif
1325};
1326
1327static int __devinit ibmveth_probe(struct vio_dev *dev,
1328 const struct vio_device_id *id)
1329{
1330 int rc, i;
1331 struct net_device *netdev;
1332 struct ibmveth_adapter *adapter;
1333 unsigned char *mac_addr_p;
1334 unsigned int *mcastFilterSize_p;
1335
1336 dev_dbg(&dev->dev, "entering ibmveth_probe for UA 0x%x\n",
1337 dev->unit_address);
1338
1339 mac_addr_p = (unsigned char *)vio_get_attribute(dev, VETH_MAC_ADDR,
1340 NULL);
1341 if (!mac_addr_p) {
1342 dev_err(&dev->dev, "Can't find VETH_MAC_ADDR attribute\n");
1343 return -EINVAL;
1344 }
1345
1346 mcastFilterSize_p = (unsigned int *)vio_get_attribute(dev,
1347 VETH_MCAST_FILTER_SIZE, NULL);
1348 if (!mcastFilterSize_p) {
1349 dev_err(&dev->dev, "Can't find VETH_MCAST_FILTER_SIZE "
1350 "attribute\n");
1351 return -EINVAL;
1352 }
1353
1354 netdev = alloc_etherdev(sizeof(struct ibmveth_adapter));
1355
1356 if (!netdev)
1357 return -ENOMEM;
1358
1359 adapter = netdev_priv(netdev);
1360 dev_set_drvdata(&dev->dev, netdev);
1361
1362 adapter->vdev = dev;
1363 adapter->netdev = netdev;
1364 adapter->mcastFilterSize = *mcastFilterSize_p;
1365 adapter->pool_config = 0;
1366
1367 netif_napi_add(netdev, &adapter->napi, ibmveth_poll, 16);
1368
1369 /*
1370 * Some older boxes running PHYP non-natively have an OF that returns
1371 * a 8-byte local-mac-address field (and the first 2 bytes have to be
1372 * ignored) while newer boxes' OF return a 6-byte field. Note that
1373 * IEEE 1275 specifies that local-mac-address must be a 6-byte field.
1374 * The RPA doc specifies that the first byte must be 10b, so we'll
1375 * just look for it to solve this 8 vs. 6 byte field issue
1376 */
1377 if ((*mac_addr_p & 0x3) != 0x02)
1378 mac_addr_p += 2;
1379
1380 adapter->mac_addr = 0;
1381 memcpy(&adapter->mac_addr, mac_addr_p, 6);
1382
1383 netdev->irq = dev->irq;
1384 netdev->netdev_ops = &ibmveth_netdev_ops;
1385 netdev->ethtool_ops = &netdev_ethtool_ops;
1386 SET_NETDEV_DEV(netdev, &dev->dev);
1387 netdev->hw_features = NETIF_F_SG | NETIF_F_RXCSUM |
1388 NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;
1389 netdev->features |= netdev->hw_features;
1390
1391 memcpy(netdev->dev_addr, &adapter->mac_addr, netdev->addr_len);
1392
1393 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1394 struct kobject *kobj = &adapter->rx_buff_pool[i].kobj;
1395 int error;
1396
1397 ibmveth_init_buffer_pool(&adapter->rx_buff_pool[i], i,
1398 pool_count[i], pool_size[i],
1399 pool_active[i]);
1400 error = kobject_init_and_add(kobj, &ktype_veth_pool,
1401 &dev->dev.kobj, "pool%d", i);
1402 if (!error)
1403 kobject_uevent(kobj, KOBJ_ADD);
1404 }
1405
1406 netdev_dbg(netdev, "adapter @ 0x%p\n", adapter);
1407
1408 adapter->buffer_list_dma = DMA_ERROR_CODE;
1409 adapter->filter_list_dma = DMA_ERROR_CODE;
1410 adapter->rx_queue.queue_dma = DMA_ERROR_CODE;
1411
1412 netdev_dbg(netdev, "registering netdev...\n");
1413
1414 ibmveth_set_features(netdev, netdev->features);
1415
1416 rc = register_netdev(netdev);
1417
1418 if (rc) {
1419 netdev_dbg(netdev, "failed to register netdev rc=%d\n", rc);
1420 free_netdev(netdev);
1421 return rc;
1422 }
1423
1424 netdev_dbg(netdev, "registered\n");
1425
1426 return 0;
1427}
1428
1429static int __devexit ibmveth_remove(struct vio_dev *dev)
1430{
1431 struct net_device *netdev = dev_get_drvdata(&dev->dev);
1432 struct ibmveth_adapter *adapter = netdev_priv(netdev);
1433 int i;
1434
1435 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
1436 kobject_put(&adapter->rx_buff_pool[i].kobj);
1437
1438 unregister_netdev(netdev);
1439
1440 free_netdev(netdev);
1441 dev_set_drvdata(&dev->dev, NULL);
1442
1443 return 0;
1444}
1445
1446static struct attribute veth_active_attr;
1447static struct attribute veth_num_attr;
1448static struct attribute veth_size_attr;
1449
1450static ssize_t veth_pool_show(struct kobject *kobj,
1451 struct attribute *attr, char *buf)
1452{
1453 struct ibmveth_buff_pool *pool = container_of(kobj,
1454 struct ibmveth_buff_pool,
1455 kobj);
1456
1457 if (attr == &veth_active_attr)
1458 return sprintf(buf, "%d\n", pool->active);
1459 else if (attr == &veth_num_attr)
1460 return sprintf(buf, "%d\n", pool->size);
1461 else if (attr == &veth_size_attr)
1462 return sprintf(buf, "%d\n", pool->buff_size);
1463 return 0;
1464}
1465
1466static ssize_t veth_pool_store(struct kobject *kobj, struct attribute *attr,
1467 const char *buf, size_t count)
1468{
1469 struct ibmveth_buff_pool *pool = container_of(kobj,
1470 struct ibmveth_buff_pool,
1471 kobj);
1472 struct net_device *netdev = dev_get_drvdata(
1473 container_of(kobj->parent, struct device, kobj));
1474 struct ibmveth_adapter *adapter = netdev_priv(netdev);
1475 long value = simple_strtol(buf, NULL, 10);
1476 long rc;
1477
1478 if (attr == &veth_active_attr) {
1479 if (value && !pool->active) {
1480 if (netif_running(netdev)) {
1481 if (ibmveth_alloc_buffer_pool(pool)) {
1482 netdev_err(netdev,
1483 "unable to alloc pool\n");
1484 return -ENOMEM;
1485 }
1486 pool->active = 1;
1487 adapter->pool_config = 1;
1488 ibmveth_close(netdev);
1489 adapter->pool_config = 0;
1490 if ((rc = ibmveth_open(netdev)))
1491 return rc;
1492 } else {
1493 pool->active = 1;
1494 }
1495 } else if (!value && pool->active) {
1496 int mtu = netdev->mtu + IBMVETH_BUFF_OH;
1497 int i;
1498 /* Make sure there is a buffer pool with buffers that
1499 can hold a packet of the size of the MTU */
1500 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1501 if (pool == &adapter->rx_buff_pool[i])
1502 continue;
1503 if (!adapter->rx_buff_pool[i].active)
1504 continue;
1505 if (mtu <= adapter->rx_buff_pool[i].buff_size)
1506 break;
1507 }
1508
1509 if (i == IBMVETH_NUM_BUFF_POOLS) {
1510 netdev_err(netdev, "no active pool >= MTU\n");
1511 return -EPERM;
1512 }
1513
1514 if (netif_running(netdev)) {
1515 adapter->pool_config = 1;
1516 ibmveth_close(netdev);
1517 pool->active = 0;
1518 adapter->pool_config = 0;
1519 if ((rc = ibmveth_open(netdev)))
1520 return rc;
1521 }
1522 pool->active = 0;
1523 }
1524 } else if (attr == &veth_num_attr) {
1525 if (value <= 0 || value > IBMVETH_MAX_POOL_COUNT) {
1526 return -EINVAL;
1527 } else {
1528 if (netif_running(netdev)) {
1529 adapter->pool_config = 1;
1530 ibmveth_close(netdev);
1531 adapter->pool_config = 0;
1532 pool->size = value;
1533 if ((rc = ibmveth_open(netdev)))
1534 return rc;
1535 } else {
1536 pool->size = value;
1537 }
1538 }
1539 } else if (attr == &veth_size_attr) {
1540 if (value <= IBMVETH_BUFF_OH || value > IBMVETH_MAX_BUF_SIZE) {
1541 return -EINVAL;
1542 } else {
1543 if (netif_running(netdev)) {
1544 adapter->pool_config = 1;
1545 ibmveth_close(netdev);
1546 adapter->pool_config = 0;
1547 pool->buff_size = value;
1548 if ((rc = ibmveth_open(netdev)))
1549 return rc;
1550 } else {
1551 pool->buff_size = value;
1552 }
1553 }
1554 }
1555
1556 /* kick the interrupt handler to allocate/deallocate pools */
1557 ibmveth_interrupt(netdev->irq, netdev);
1558 return count;
1559}
1560
1561
1562#define ATTR(_name, _mode) \
1563 struct attribute veth_##_name##_attr = { \
1564 .name = __stringify(_name), .mode = _mode, \
1565 };
1566
1567static ATTR(active, 0644);
1568static ATTR(num, 0644);
1569static ATTR(size, 0644);
1570
1571static struct attribute *veth_pool_attrs[] = {
1572 &veth_active_attr,
1573 &veth_num_attr,
1574 &veth_size_attr,
1575 NULL,
1576};
1577
1578static const struct sysfs_ops veth_pool_ops = {
1579 .show = veth_pool_show,
1580 .store = veth_pool_store,
1581};
1582
1583static struct kobj_type ktype_veth_pool = {
1584 .release = NULL,
1585 .sysfs_ops = &veth_pool_ops,
1586 .default_attrs = veth_pool_attrs,
1587};
1588
1589static int ibmveth_resume(struct device *dev)
1590{
1591 struct net_device *netdev = dev_get_drvdata(dev);
1592 ibmveth_interrupt(netdev->irq, netdev);
1593 return 0;
1594}
1595
1596static struct vio_device_id ibmveth_device_table[] __devinitdata = {
1597 { "network", "IBM,l-lan"},
1598 { "", "" }
1599};
1600MODULE_DEVICE_TABLE(vio, ibmveth_device_table);
1601
1602static struct dev_pm_ops ibmveth_pm_ops = {
1603 .resume = ibmveth_resume
1604};
1605
1606static struct vio_driver ibmveth_driver = {
1607 .id_table = ibmveth_device_table,
1608 .probe = ibmveth_probe,
1609 .remove = ibmveth_remove,
1610 .get_desired_dma = ibmveth_get_desired_dma,
1611 .name = ibmveth_driver_name,
1612 .pm = &ibmveth_pm_ops,
1613};
1614
1615static int __init ibmveth_module_init(void)
1616{
1617 printk(KERN_DEBUG "%s: %s %s\n", ibmveth_driver_name,
1618 ibmveth_driver_string, ibmveth_driver_version);
1619
1620 return vio_register_driver(&ibmveth_driver);
1621}
1622
1623static void __exit ibmveth_module_exit(void)
1624{
1625 vio_unregister_driver(&ibmveth_driver);
1626}
1627
1628module_init(ibmveth_module_init);
1629module_exit(ibmveth_module_exit);