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Merge tag 'gpio-v3.13-3' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw...
[linux-2.6.git] / drivers / net / ethernet / ibm / ibmveth.c
blob952d795230a479c79c0684ee0849a05e5e0ff631
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
53 static irqreturn_t ibmveth_interrupt(int irq, void *dev_instance);
54 static void ibmveth_rxq_harvest_buffer(struct ibmveth_adapter *adapter);
55 static unsigned long ibmveth_get_desired_dma(struct vio_dev *vdev);
56
57 static struct kobj_type ktype_veth_pool;
58
59
60 static const char ibmveth_driver_name[] = "ibmveth";
61 static const char ibmveth_driver_string[] = "IBM Power Virtual Ethernet Driver";
62 #define ibmveth_driver_version "1.04"
63
64 MODULE_AUTHOR("Santiago Leon <santil@linux.vnet.ibm.com>");
65 MODULE_DESCRIPTION("IBM Power Virtual Ethernet Driver");
66 MODULE_LICENSE("GPL");
67 MODULE_VERSION(ibmveth_driver_version);
68
69 static unsigned int tx_copybreak __read_mostly = 128;
70 module_param(tx_copybreak, uint, 0644);
71 MODULE_PARM_DESC(tx_copybreak,
72 "Maximum size of packet that is copied to a new buffer on transmit");
73
74 static unsigned int rx_copybreak __read_mostly = 128;
75 module_param(rx_copybreak, uint, 0644);
76 MODULE_PARM_DESC(rx_copybreak,
77 "Maximum size of packet that is copied to a new buffer on receive");
78
79 static unsigned int rx_flush __read_mostly = 0;
80 module_param(rx_flush, uint, 0644);
81 MODULE_PARM_DESC(rx_flush, "Flush receive buffers before use");
82
83 struct 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
91 struct 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 */
107 static inline u32 ibmveth_rxq_flags(struct ibmveth_adapter *adapter)
108 {
109 return be32_to_cpu(adapter->rx_queue.queue_addr[adapter->rx_queue.index].flags_off);
110 }
111
112 static 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
118 static inline int ibmveth_rxq_pending_buffer(struct ibmveth_adapter *adapter)
119 {
120 return ibmveth_rxq_toggle(adapter) == adapter->rx_queue.toggle;
121 }
122
123 static inline int ibmveth_rxq_buffer_valid(struct ibmveth_adapter *adapter)
124 {
125 return ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_VALID;
126 }
127
128 static inline int ibmveth_rxq_frame_offset(struct ibmveth_adapter *adapter)
129 {
130 return ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_OFF_MASK;
131 }
132
133 static inline int ibmveth_rxq_frame_length(struct ibmveth_adapter *adapter)
134 {
135 return be32_to_cpu(adapter->rx_queue.queue_addr[adapter->rx_queue.index].length);
136 }
137
138 static 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 */
144 static 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 */
156 static 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
195 static 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 */
206 static 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
278 failure:
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 */
297 static 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 */
316 static 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 */
350 static 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 */
385 static 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 */
398 static 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
435 out:
436 return ret;
437 }
438
439 static 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
449 static 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
499 static 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 */
509 retry:
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
526 static 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 if (!adapter->rx_queue.queue_addr) {
562 rc = -ENOMEM;
563 goto err_out;
564 }
565
566 adapter->buffer_list_dma = dma_map_single(dev,
567 adapter->buffer_list_addr, 4096, DMA_BIDIRECTIONAL);
568 adapter->filter_list_dma = dma_map_single(dev,
569 adapter->filter_list_addr, 4096, DMA_BIDIRECTIONAL);
570
571 if ((dma_mapping_error(dev, adapter->buffer_list_dma)) ||
572 (dma_mapping_error(dev, adapter->filter_list_dma))) {
573 netdev_err(netdev, "unable to map filter or buffer list "
574 "pages\n");
575 rc = -ENOMEM;
576 goto err_out;
577 }
578
579 adapter->rx_queue.index = 0;
580 adapter->rx_queue.num_slots = rxq_entries;
581 adapter->rx_queue.toggle = 1;
582
583 memcpy(&mac_address, netdev->dev_addr, netdev->addr_len);
584 mac_address = mac_address >> 16;
585
586 rxq_desc.fields.flags_len = IBMVETH_BUF_VALID |
587 adapter->rx_queue.queue_len;
588 rxq_desc.fields.address = adapter->rx_queue.queue_dma;
589
590 netdev_dbg(netdev, "buffer list @ 0x%p\n", adapter->buffer_list_addr);
591 netdev_dbg(netdev, "filter list @ 0x%p\n", adapter->filter_list_addr);
592 netdev_dbg(netdev, "receive q @ 0x%p\n", adapter->rx_queue.queue_addr);
593
594 h_vio_signal(adapter->vdev->unit_address, VIO_IRQ_DISABLE);
595
596 lpar_rc = ibmveth_register_logical_lan(adapter, rxq_desc, mac_address);
597
598 if (lpar_rc != H_SUCCESS) {
599 netdev_err(netdev, "h_register_logical_lan failed with %ld\n",
600 lpar_rc);
601 netdev_err(netdev, "buffer TCE:0x%llx filter TCE:0x%llx rxq "
602 "desc:0x%llx MAC:0x%llx\n",
603 adapter->buffer_list_dma,
604 adapter->filter_list_dma,
605 rxq_desc.desc,
606 mac_address);
607 rc = -ENONET;
608 goto err_out;
609 }
610
611 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
612 if (!adapter->rx_buff_pool[i].active)
613 continue;
614 if (ibmveth_alloc_buffer_pool(&adapter->rx_buff_pool[i])) {
615 netdev_err(netdev, "unable to alloc pool\n");
616 adapter->rx_buff_pool[i].active = 0;
617 rc = -ENOMEM;
618 goto err_out;
619 }
620 }
621
622 netdev_dbg(netdev, "registering irq 0x%x\n", netdev->irq);
623 rc = request_irq(netdev->irq, ibmveth_interrupt, 0, netdev->name,
624 netdev);
625 if (rc != 0) {
626 netdev_err(netdev, "unable to request irq 0x%x, rc %d\n",
627 netdev->irq, rc);
628 do {
629 lpar_rc = h_free_logical_lan(adapter->vdev->unit_address);
630 } while (H_IS_LONG_BUSY(lpar_rc) || (lpar_rc == H_BUSY));
631
632 goto err_out;
633 }
634
635 adapter->bounce_buffer =
636 kmalloc(netdev->mtu + IBMVETH_BUFF_OH, GFP_KERNEL);
637 if (!adapter->bounce_buffer) {
638 rc = -ENOMEM;
639 goto err_out_free_irq;
640 }
641 adapter->bounce_buffer_dma =
642 dma_map_single(&adapter->vdev->dev, adapter->bounce_buffer,
643 netdev->mtu + IBMVETH_BUFF_OH, DMA_BIDIRECTIONAL);
644 if (dma_mapping_error(dev, adapter->bounce_buffer_dma)) {
645 netdev_err(netdev, "unable to map bounce buffer\n");
646 rc = -ENOMEM;
647 goto err_out_free_irq;
648 }
649
650 netdev_dbg(netdev, "initial replenish cycle\n");
651 ibmveth_interrupt(netdev->irq, netdev);
652
653 netif_start_queue(netdev);
654
655 netdev_dbg(netdev, "open complete\n");
656
657 return 0;
658
659 err_out_free_irq:
660 free_irq(netdev->irq, netdev);
661 err_out:
662 ibmveth_cleanup(adapter);
663 napi_disable(&adapter->napi);
664 return rc;
665 }
666
667 static int ibmveth_close(struct net_device *netdev)
668 {
669 struct ibmveth_adapter *adapter = netdev_priv(netdev);
670 long lpar_rc;
671
672 netdev_dbg(netdev, "close starting\n");
673
674 napi_disable(&adapter->napi);
675
676 if (!adapter->pool_config)
677 netif_stop_queue(netdev);
678
679 h_vio_signal(adapter->vdev->unit_address, VIO_IRQ_DISABLE);
680
681 do {
682 lpar_rc = h_free_logical_lan(adapter->vdev->unit_address);
683 } while (H_IS_LONG_BUSY(lpar_rc) || (lpar_rc == H_BUSY));
684
685 if (lpar_rc != H_SUCCESS) {
686 netdev_err(netdev, "h_free_logical_lan failed with %lx, "
687 "continuing with close\n", lpar_rc);
688 }
689
690 free_irq(netdev->irq, netdev);
691
692 adapter->rx_no_buffer = *(u64 *)(((char *)adapter->buffer_list_addr) +
693 4096 - 8);
694
695 ibmveth_cleanup(adapter);
696
697 netdev_dbg(netdev, "close complete\n");
698
699 return 0;
700 }
701
702 static int netdev_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
703 {
704 cmd->supported = (SUPPORTED_1000baseT_Full | SUPPORTED_Autoneg |
705 SUPPORTED_FIBRE);
706 cmd->advertising = (ADVERTISED_1000baseT_Full | ADVERTISED_Autoneg |
707 ADVERTISED_FIBRE);
708 ethtool_cmd_speed_set(cmd, SPEED_1000);
709 cmd->duplex = DUPLEX_FULL;
710 cmd->port = PORT_FIBRE;
711 cmd->phy_address = 0;
712 cmd->transceiver = XCVR_INTERNAL;
713 cmd->autoneg = AUTONEG_ENABLE;
714 cmd->maxtxpkt = 0;
715 cmd->maxrxpkt = 1;
716 return 0;
717 }
718
719 static void netdev_get_drvinfo(struct net_device *dev,
720 struct ethtool_drvinfo *info)
721 {
722 strlcpy(info->driver, ibmveth_driver_name, sizeof(info->driver));
723 strlcpy(info->version, ibmveth_driver_version, sizeof(info->version));
724 }
725
726 static netdev_features_t ibmveth_fix_features(struct net_device *dev,
727 netdev_features_t features)
728 {
729 /*
730 * Since the ibmveth firmware interface does not have the
731 * concept of separate tx/rx checksum offload enable, if rx
732 * checksum is disabled we also have to disable tx checksum
733 * offload. Once we disable rx checksum offload, we are no
734 * longer allowed to send tx buffers that are not properly
735 * checksummed.
736 */
737
738 if (!(features & NETIF_F_RXCSUM))
739 features &= ~NETIF_F_ALL_CSUM;
740
741 return features;
742 }
743
744 static int ibmveth_set_csum_offload(struct net_device *dev, u32 data)
745 {
746 struct ibmveth_adapter *adapter = netdev_priv(dev);
747 unsigned long set_attr, clr_attr, ret_attr;
748 unsigned long set_attr6, clr_attr6;
749 long ret, ret4, ret6;
750 int rc1 = 0, rc2 = 0;
751 int restart = 0;
752
753 if (netif_running(dev)) {
754 restart = 1;
755 adapter->pool_config = 1;
756 ibmveth_close(dev);
757 adapter->pool_config = 0;
758 }
759
760 set_attr = 0;
761 clr_attr = 0;
762 set_attr6 = 0;
763 clr_attr6 = 0;
764
765 if (data) {
766 set_attr = IBMVETH_ILLAN_IPV4_TCP_CSUM;
767 set_attr6 = IBMVETH_ILLAN_IPV6_TCP_CSUM;
768 } else {
769 clr_attr = IBMVETH_ILLAN_IPV4_TCP_CSUM;
770 clr_attr6 = IBMVETH_ILLAN_IPV6_TCP_CSUM;
771 }
772
773 ret = h_illan_attributes(adapter->vdev->unit_address, 0, 0, &ret_attr);
774
775 if (ret == H_SUCCESS && !(ret_attr & IBMVETH_ILLAN_ACTIVE_TRUNK) &&
776 !(ret_attr & IBMVETH_ILLAN_TRUNK_PRI_MASK) &&
777 (ret_attr & IBMVETH_ILLAN_PADDED_PKT_CSUM)) {
778 ret4 = h_illan_attributes(adapter->vdev->unit_address, clr_attr,
779 set_attr, &ret_attr);
780
781 if (ret4 != H_SUCCESS) {
782 netdev_err(dev, "unable to change IPv4 checksum "
783 "offload settings. %d rc=%ld\n",
784 data, ret4);
785
786 h_illan_attributes(adapter->vdev->unit_address,
787 set_attr, clr_attr, &ret_attr);
788
789 if (data == 1)
790 dev->features &= ~NETIF_F_IP_CSUM;
791
792 } else {
793 adapter->fw_ipv4_csum_support = data;
794 }
795
796 ret6 = h_illan_attributes(adapter->vdev->unit_address,
797 clr_attr6, set_attr6, &ret_attr);
798
799 if (ret6 != H_SUCCESS) {
800 netdev_err(dev, "unable to change IPv6 checksum "
801 "offload settings. %d rc=%ld\n",
802 data, ret6);
803
804 h_illan_attributes(adapter->vdev->unit_address,
805 set_attr6, clr_attr6, &ret_attr);
806
807 if (data == 1)
808 dev->features &= ~NETIF_F_IPV6_CSUM;
809
810 } else
811 adapter->fw_ipv6_csum_support = data;
812
813 if (ret4 == H_SUCCESS || ret6 == H_SUCCESS)
814 adapter->rx_csum = data;
815 else
816 rc1 = -EIO;
817 } else {
818 rc1 = -EIO;
819 netdev_err(dev, "unable to change checksum offload settings."
820 " %d rc=%ld ret_attr=%lx\n", data, ret,
821 ret_attr);
822 }
823
824 if (restart)
825 rc2 = ibmveth_open(dev);
826
827 return rc1 ? rc1 : rc2;
828 }
829
830 static int ibmveth_set_features(struct net_device *dev,
831 netdev_features_t features)
832 {
833 struct ibmveth_adapter *adapter = netdev_priv(dev);
834 int rx_csum = !!(features & NETIF_F_RXCSUM);
835 int rc;
836
837 if (rx_csum == adapter->rx_csum)
838 return 0;
839
840 rc = ibmveth_set_csum_offload(dev, rx_csum);
841 if (rc && !adapter->rx_csum)
842 dev->features = features & ~(NETIF_F_ALL_CSUM | NETIF_F_RXCSUM);
843
844 return rc;
845 }
846
847 static void ibmveth_get_strings(struct net_device *dev, u32 stringset, u8 *data)
848 {
849 int i;
850
851 if (stringset != ETH_SS_STATS)
852 return;
853
854 for (i = 0; i < ARRAY_SIZE(ibmveth_stats); i++, data += ETH_GSTRING_LEN)
855 memcpy(data, ibmveth_stats[i].name, ETH_GSTRING_LEN);
856 }
857
858 static int ibmveth_get_sset_count(struct net_device *dev, int sset)
859 {
860 switch (sset) {
861 case ETH_SS_STATS:
862 return ARRAY_SIZE(ibmveth_stats);
863 default:
864 return -EOPNOTSUPP;
865 }
866 }
867
868 static void ibmveth_get_ethtool_stats(struct net_device *dev,
869 struct ethtool_stats *stats, u64 *data)
870 {
871 int i;
872 struct ibmveth_adapter *adapter = netdev_priv(dev);
873
874 for (i = 0; i < ARRAY_SIZE(ibmveth_stats); i++)
875 data[i] = IBMVETH_GET_STAT(adapter, ibmveth_stats[i].offset);
876 }
877
878 static const struct ethtool_ops netdev_ethtool_ops = {
879 .get_drvinfo = netdev_get_drvinfo,
880 .get_settings = netdev_get_settings,
881 .get_link = ethtool_op_get_link,
882 .get_strings = ibmveth_get_strings,
883 .get_sset_count = ibmveth_get_sset_count,
884 .get_ethtool_stats = ibmveth_get_ethtool_stats,
885 };
886
887 static int ibmveth_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
888 {
889 return -EOPNOTSUPP;
890 }
891
892 #define page_offset(v) ((unsigned long)(v) & ((1 << 12) - 1))
893
894 static int ibmveth_send(struct ibmveth_adapter *adapter,
895 union ibmveth_buf_desc *descs)
896 {
897 unsigned long correlator;
898 unsigned int retry_count;
899 unsigned long ret;
900
901 /*
902 * The retry count sets a maximum for the number of broadcast and
903 * multicast destinations within the system.
904 */
905 retry_count = 1024;
906 correlator = 0;
907 do {
908 ret = h_send_logical_lan(adapter->vdev->unit_address,
909 descs[0].desc, descs[1].desc,
910 descs[2].desc, descs[3].desc,
911 descs[4].desc, descs[5].desc,
912 correlator, &correlator);
913 } while ((ret == H_BUSY) && (retry_count--));
914
915 if (ret != H_SUCCESS && ret != H_DROPPED) {
916 netdev_err(adapter->netdev, "tx: h_send_logical_lan failed "
917 "with rc=%ld\n", ret);
918 return 1;
919 }
920
921 return 0;
922 }
923
924 static netdev_tx_t ibmveth_start_xmit(struct sk_buff *skb,
925 struct net_device *netdev)
926 {
927 struct ibmveth_adapter *adapter = netdev_priv(netdev);
928 unsigned int desc_flags;
929 union ibmveth_buf_desc descs[6];
930 int last, i;
931 int force_bounce = 0;
932 dma_addr_t dma_addr;
933
934 /*
935 * veth handles a maximum of 6 segments including the header, so
936 * we have to linearize the skb if there are more than this.
937 */
938 if (skb_shinfo(skb)->nr_frags > 5 && __skb_linearize(skb)) {
939 netdev->stats.tx_dropped++;
940 goto out;
941 }
942
943 /* veth can't checksum offload UDP */
944 if (skb->ip_summed == CHECKSUM_PARTIAL &&
945 ((skb->protocol == htons(ETH_P_IP) &&
946 ip_hdr(skb)->protocol != IPPROTO_TCP) ||
947 (skb->protocol == htons(ETH_P_IPV6) &&
948 ipv6_hdr(skb)->nexthdr != IPPROTO_TCP)) &&
949 skb_checksum_help(skb)) {
950
951 netdev_err(netdev, "tx: failed to checksum packet\n");
952 netdev->stats.tx_dropped++;
953 goto out;
954 }
955
956 desc_flags = IBMVETH_BUF_VALID;
957
958 if (skb->ip_summed == CHECKSUM_PARTIAL) {
959 unsigned char *buf = skb_transport_header(skb) +
960 skb->csum_offset;
961
962 desc_flags |= (IBMVETH_BUF_NO_CSUM | IBMVETH_BUF_CSUM_GOOD);
963
964 /* Need to zero out the checksum */
965 buf[0] = 0;
966 buf[1] = 0;
967 }
968
969 retry_bounce:
970 memset(descs, 0, sizeof(descs));
971
972 /*
973 * If a linear packet is below the rx threshold then
974 * copy it into the static bounce buffer. This avoids the
975 * cost of a TCE insert and remove.
976 */
977 if (force_bounce || (!skb_is_nonlinear(skb) &&
978 (skb->len < tx_copybreak))) {
979 skb_copy_from_linear_data(skb, adapter->bounce_buffer,
980 skb->len);
981
982 descs[0].fields.flags_len = desc_flags | skb->len;
983 descs[0].fields.address = adapter->bounce_buffer_dma;
984
985 if (ibmveth_send(adapter, descs)) {
986 adapter->tx_send_failed++;
987 netdev->stats.tx_dropped++;
988 } else {
989 netdev->stats.tx_packets++;
990 netdev->stats.tx_bytes += skb->len;
991 }
992
993 goto out;
994 }
995
996 /* Map the header */
997 dma_addr = dma_map_single(&adapter->vdev->dev, skb->data,
998 skb_headlen(skb), DMA_TO_DEVICE);
999 if (dma_mapping_error(&adapter->vdev->dev, dma_addr))
1000 goto map_failed;
1001
1002 descs[0].fields.flags_len = desc_flags | skb_headlen(skb);
1003 descs[0].fields.address = dma_addr;
1004
1005 /* Map the frags */
1006 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1007 const skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1008
1009 dma_addr = skb_frag_dma_map(&adapter->vdev->dev, frag, 0,
1010 skb_frag_size(frag), DMA_TO_DEVICE);
1011
1012 if (dma_mapping_error(&adapter->vdev->dev, dma_addr))
1013 goto map_failed_frags;
1014
1015 descs[i+1].fields.flags_len = desc_flags | skb_frag_size(frag);
1016 descs[i+1].fields.address = dma_addr;
1017 }
1018
1019 if (ibmveth_send(adapter, descs)) {
1020 adapter->tx_send_failed++;
1021 netdev->stats.tx_dropped++;
1022 } else {
1023 netdev->stats.tx_packets++;
1024 netdev->stats.tx_bytes += skb->len;
1025 }
1026
1027 dma_unmap_single(&adapter->vdev->dev,
1028 descs[0].fields.address,
1029 descs[0].fields.flags_len & IBMVETH_BUF_LEN_MASK,
1030 DMA_TO_DEVICE);
1031
1032 for (i = 1; i < skb_shinfo(skb)->nr_frags + 1; i++)
1033 dma_unmap_page(&adapter->vdev->dev, descs[i].fields.address,
1034 descs[i].fields.flags_len & IBMVETH_BUF_LEN_MASK,
1035 DMA_TO_DEVICE);
1036
1037 out:
1038 dev_kfree_skb(skb);
1039 return NETDEV_TX_OK;
1040
1041 map_failed_frags:
1042 last = i+1;
1043 for (i = 0; i < last; i++)
1044 dma_unmap_page(&adapter->vdev->dev, descs[i].fields.address,
1045 descs[i].fields.flags_len & IBMVETH_BUF_LEN_MASK,
1046 DMA_TO_DEVICE);
1047
1048 map_failed:
1049 if (!firmware_has_feature(FW_FEATURE_CMO))
1050 netdev_err(netdev, "tx: unable to map xmit buffer\n");
1051 adapter->tx_map_failed++;
1052 skb_linearize(skb);
1053 force_bounce = 1;
1054 goto retry_bounce;
1055 }
1056
1057 static int ibmveth_poll(struct napi_struct *napi, int budget)
1058 {
1059 struct ibmveth_adapter *adapter =
1060 container_of(napi, struct ibmveth_adapter, napi);
1061 struct net_device *netdev = adapter->netdev;
1062 int frames_processed = 0;
1063 unsigned long lpar_rc;
1064
1065 restart_poll:
1066 do {
1067 if (!ibmveth_rxq_pending_buffer(adapter))
1068 break;
1069
1070 smp_rmb();
1071 if (!ibmveth_rxq_buffer_valid(adapter)) {
1072 wmb(); /* suggested by larson1 */
1073 adapter->rx_invalid_buffer++;
1074 netdev_dbg(netdev, "recycling invalid buffer\n");
1075 ibmveth_rxq_recycle_buffer(adapter);
1076 } else {
1077 struct sk_buff *skb, *new_skb;
1078 int length = ibmveth_rxq_frame_length(adapter);
1079 int offset = ibmveth_rxq_frame_offset(adapter);
1080 int csum_good = ibmveth_rxq_csum_good(adapter);
1081
1082 skb = ibmveth_rxq_get_buffer(adapter);
1083
1084 new_skb = NULL;
1085 if (length < rx_copybreak)
1086 new_skb = netdev_alloc_skb(netdev, length);
1087
1088 if (new_skb) {
1089 skb_copy_to_linear_data(new_skb,
1090 skb->data + offset,
1091 length);
1092 if (rx_flush)
1093 ibmveth_flush_buffer(skb->data,
1094 length + offset);
1095 if (!ibmveth_rxq_recycle_buffer(adapter))
1096 kfree_skb(skb);
1097 skb = new_skb;
1098 } else {
1099 ibmveth_rxq_harvest_buffer(adapter);
1100 skb_reserve(skb, offset);
1101 }
1102
1103 skb_put(skb, length);
1104 skb->protocol = eth_type_trans(skb, netdev);
1105
1106 if (csum_good)
1107 skb->ip_summed = CHECKSUM_UNNECESSARY;
1108
1109 netif_receive_skb(skb); /* send it up */
1110
1111 netdev->stats.rx_packets++;
1112 netdev->stats.rx_bytes += length;
1113 frames_processed++;
1114 }
1115 } while (frames_processed < budget);
1116
1117 ibmveth_replenish_task(adapter);
1118
1119 if (frames_processed < budget) {
1120 /* We think we are done - reenable interrupts,
1121 * then check once more to make sure we are done.
1122 */
1123 lpar_rc = h_vio_signal(adapter->vdev->unit_address,
1124 VIO_IRQ_ENABLE);
1125
1126 BUG_ON(lpar_rc != H_SUCCESS);
1127
1128 napi_complete(napi);
1129
1130 if (ibmveth_rxq_pending_buffer(adapter) &&
1131 napi_reschedule(napi)) {
1132 lpar_rc = h_vio_signal(adapter->vdev->unit_address,
1133 VIO_IRQ_DISABLE);
1134 goto restart_poll;
1135 }
1136 }
1137
1138 return frames_processed;
1139 }
1140
1141 static irqreturn_t ibmveth_interrupt(int irq, void *dev_instance)
1142 {
1143 struct net_device *netdev = dev_instance;
1144 struct ibmveth_adapter *adapter = netdev_priv(netdev);
1145 unsigned long lpar_rc;
1146
1147 if (napi_schedule_prep(&adapter->napi)) {
1148 lpar_rc = h_vio_signal(adapter->vdev->unit_address,
1149 VIO_IRQ_DISABLE);
1150 BUG_ON(lpar_rc != H_SUCCESS);
1151 __napi_schedule(&adapter->napi);
1152 }
1153 return IRQ_HANDLED;
1154 }
1155
1156 static void ibmveth_set_multicast_list(struct net_device *netdev)
1157 {
1158 struct ibmveth_adapter *adapter = netdev_priv(netdev);
1159 unsigned long lpar_rc;
1160
1161 if ((netdev->flags & IFF_PROMISC) ||
1162 (netdev_mc_count(netdev) > adapter->mcastFilterSize)) {
1163 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1164 IbmVethMcastEnableRecv |
1165 IbmVethMcastDisableFiltering,
1166 0);
1167 if (lpar_rc != H_SUCCESS) {
1168 netdev_err(netdev, "h_multicast_ctrl rc=%ld when "
1169 "entering promisc mode\n", lpar_rc);
1170 }
1171 } else {
1172 struct netdev_hw_addr *ha;
1173 /* clear the filter table & disable filtering */
1174 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1175 IbmVethMcastEnableRecv |
1176 IbmVethMcastDisableFiltering |
1177 IbmVethMcastClearFilterTable,
1178 0);
1179 if (lpar_rc != H_SUCCESS) {
1180 netdev_err(netdev, "h_multicast_ctrl rc=%ld when "
1181 "attempting to clear filter table\n",
1182 lpar_rc);
1183 }
1184 /* add the addresses to the filter table */
1185 netdev_for_each_mc_addr(ha, netdev) {
1186 /* add the multicast address to the filter table */
1187 unsigned long mcast_addr = 0;
1188 memcpy(((char *)&mcast_addr)+2, ha->addr, ETH_ALEN);
1189 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1190 IbmVethMcastAddFilter,
1191 mcast_addr);
1192 if (lpar_rc != H_SUCCESS) {
1193 netdev_err(netdev, "h_multicast_ctrl rc=%ld "
1194 "when adding an entry to the filter "
1195 "table\n", lpar_rc);
1196 }
1197 }
1198
1199 /* re-enable filtering */
1200 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1201 IbmVethMcastEnableFiltering,
1202 0);
1203 if (lpar_rc != H_SUCCESS) {
1204 netdev_err(netdev, "h_multicast_ctrl rc=%ld when "
1205 "enabling filtering\n", lpar_rc);
1206 }
1207 }
1208 }
1209
1210 static int ibmveth_change_mtu(struct net_device *dev, int new_mtu)
1211 {
1212 struct ibmveth_adapter *adapter = netdev_priv(dev);
1213 struct vio_dev *viodev = adapter->vdev;
1214 int new_mtu_oh = new_mtu + IBMVETH_BUFF_OH;
1215 int i, rc;
1216 int need_restart = 0;
1217
1218 if (new_mtu < IBMVETH_MIN_MTU)
1219 return -EINVAL;
1220
1221 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
1222 if (new_mtu_oh < adapter->rx_buff_pool[i].buff_size)
1223 break;
1224
1225 if (i == IBMVETH_NUM_BUFF_POOLS)
1226 return -EINVAL;
1227
1228 /* Deactivate all the buffer pools so that the next loop can activate
1229 only the buffer pools necessary to hold the new MTU */
1230 if (netif_running(adapter->netdev)) {
1231 need_restart = 1;
1232 adapter->pool_config = 1;
1233 ibmveth_close(adapter->netdev);
1234 adapter->pool_config = 0;
1235 }
1236
1237 /* Look for an active buffer pool that can hold the new MTU */
1238 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1239 adapter->rx_buff_pool[i].active = 1;
1240
1241 if (new_mtu_oh < adapter->rx_buff_pool[i].buff_size) {
1242 dev->mtu = new_mtu;
1243 vio_cmo_set_dev_desired(viodev,
1244 ibmveth_get_desired_dma
1245 (viodev));
1246 if (need_restart) {
1247 return ibmveth_open(adapter->netdev);
1248 }
1249 return 0;
1250 }
1251 }
1252
1253 if (need_restart && (rc = ibmveth_open(adapter->netdev)))
1254 return rc;
1255
1256 return -EINVAL;
1257 }
1258
1259 #ifdef CONFIG_NET_POLL_CONTROLLER
1260 static void ibmveth_poll_controller(struct net_device *dev)
1261 {
1262 ibmveth_replenish_task(netdev_priv(dev));
1263 ibmveth_interrupt(dev->irq, dev);
1264 }
1265 #endif
1266
1267 /**
1268 * ibmveth_get_desired_dma - Calculate IO memory desired by the driver
1269 *
1270 * @vdev: struct vio_dev for the device whose desired IO mem is to be returned
1271 *
1272 * Return value:
1273 * Number of bytes of IO data the driver will need to perform well.
1274 */
1275 static unsigned long ibmveth_get_desired_dma(struct vio_dev *vdev)
1276 {
1277 struct net_device *netdev = dev_get_drvdata(&vdev->dev);
1278 struct ibmveth_adapter *adapter;
1279 unsigned long ret;
1280 int i;
1281 int rxqentries = 1;
1282
1283 /* netdev inits at probe time along with the structures we need below*/
1284 if (netdev == NULL)
1285 return IOMMU_PAGE_ALIGN(IBMVETH_IO_ENTITLEMENT_DEFAULT);
1286
1287 adapter = netdev_priv(netdev);
1288
1289 ret = IBMVETH_BUFF_LIST_SIZE + IBMVETH_FILT_LIST_SIZE;
1290 ret += IOMMU_PAGE_ALIGN(netdev->mtu);
1291
1292 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1293 /* add the size of the active receive buffers */
1294 if (adapter->rx_buff_pool[i].active)
1295 ret +=
1296 adapter->rx_buff_pool[i].size *
1297 IOMMU_PAGE_ALIGN(adapter->rx_buff_pool[i].
1298 buff_size);
1299 rxqentries += adapter->rx_buff_pool[i].size;
1300 }
1301 /* add the size of the receive queue entries */
1302 ret += IOMMU_PAGE_ALIGN(rxqentries * sizeof(struct ibmveth_rx_q_entry));
1303
1304 return ret;
1305 }
1306
1307 static const struct net_device_ops ibmveth_netdev_ops = {
1308 .ndo_open = ibmveth_open,
1309 .ndo_stop = ibmveth_close,
1310 .ndo_start_xmit = ibmveth_start_xmit,
1311 .ndo_set_rx_mode = ibmveth_set_multicast_list,
1312 .ndo_do_ioctl = ibmveth_ioctl,
1313 .ndo_change_mtu = ibmveth_change_mtu,
1314 .ndo_fix_features = ibmveth_fix_features,
1315 .ndo_set_features = ibmveth_set_features,
1316 .ndo_validate_addr = eth_validate_addr,
1317 .ndo_set_mac_address = eth_mac_addr,
1318 #ifdef CONFIG_NET_POLL_CONTROLLER
1319 .ndo_poll_controller = ibmveth_poll_controller,
1320 #endif
1321 };
1322
1323 static int ibmveth_probe(struct vio_dev *dev, const struct vio_device_id *id)
1324 {
1325 int rc, i, mac_len;
1326 struct net_device *netdev;
1327 struct ibmveth_adapter *adapter;
1328 unsigned char *mac_addr_p;
1329 unsigned int *mcastFilterSize_p;
1330
1331 dev_dbg(&dev->dev, "entering ibmveth_probe for UA 0x%x\n",
1332 dev->unit_address);
1333
1334 mac_addr_p = (unsigned char *)vio_get_attribute(dev, VETH_MAC_ADDR,
1335 &mac_len);
1336 if (!mac_addr_p) {
1337 dev_err(&dev->dev, "Can't find VETH_MAC_ADDR attribute\n");
1338 return -EINVAL;
1339 }
1340 /* Workaround for old/broken pHyp */
1341 if (mac_len == 8)
1342 mac_addr_p += 2;
1343 else if (mac_len != 6) {
1344 dev_err(&dev->dev, "VETH_MAC_ADDR attribute wrong len %d\n",
1345 mac_len);
1346 return -EINVAL;
1347 }
1348
1349 mcastFilterSize_p = (unsigned int *)vio_get_attribute(dev,
1350 VETH_MCAST_FILTER_SIZE, NULL);
1351 if (!mcastFilterSize_p) {
1352 dev_err(&dev->dev, "Can't find VETH_MCAST_FILTER_SIZE "
1353 "attribute\n");
1354 return -EINVAL;
1355 }
1356
1357 netdev = alloc_etherdev(sizeof(struct ibmveth_adapter));
1358
1359 if (!netdev)
1360 return -ENOMEM;
1361
1362 adapter = netdev_priv(netdev);
1363 dev_set_drvdata(&dev->dev, netdev);
1364
1365 adapter->vdev = dev;
1366 adapter->netdev = netdev;
1367 adapter->mcastFilterSize = *mcastFilterSize_p;
1368 adapter->pool_config = 0;
1369
1370 netif_napi_add(netdev, &adapter->napi, ibmveth_poll, 16);
1371
1372 adapter->mac_addr = 0;
1373 memcpy(&adapter->mac_addr, mac_addr_p, ETH_ALEN);
1374
1375 netdev->irq = dev->irq;
1376 netdev->netdev_ops = &ibmveth_netdev_ops;
1377 netdev->ethtool_ops = &netdev_ethtool_ops;
1378 SET_NETDEV_DEV(netdev, &dev->dev);
1379 netdev->hw_features = NETIF_F_SG | NETIF_F_RXCSUM |
1380 NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;
1381 netdev->features |= netdev->hw_features;
1382
1383 memcpy(netdev->dev_addr, &adapter->mac_addr, netdev->addr_len);
1384
1385 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1386 struct kobject *kobj = &adapter->rx_buff_pool[i].kobj;
1387 int error;
1388
1389 ibmveth_init_buffer_pool(&adapter->rx_buff_pool[i], i,
1390 pool_count[i], pool_size[i],
1391 pool_active[i]);
1392 error = kobject_init_and_add(kobj, &ktype_veth_pool,
1393 &dev->dev.kobj, "pool%d", i);
1394 if (!error)
1395 kobject_uevent(kobj, KOBJ_ADD);
1396 }
1397
1398 netdev_dbg(netdev, "adapter @ 0x%p\n", adapter);
1399
1400 adapter->buffer_list_dma = DMA_ERROR_CODE;
1401 adapter->filter_list_dma = DMA_ERROR_CODE;
1402 adapter->rx_queue.queue_dma = DMA_ERROR_CODE;
1403
1404 netdev_dbg(netdev, "registering netdev...\n");
1405
1406 ibmveth_set_features(netdev, netdev->features);
1407
1408 rc = register_netdev(netdev);
1409
1410 if (rc) {
1411 netdev_dbg(netdev, "failed to register netdev rc=%d\n", rc);
1412 free_netdev(netdev);
1413 return rc;
1414 }
1415
1416 netdev_dbg(netdev, "registered\n");
1417
1418 return 0;
1419 }
1420
1421 static int ibmveth_remove(struct vio_dev *dev)
1422 {
1423 struct net_device *netdev = dev_get_drvdata(&dev->dev);
1424 struct ibmveth_adapter *adapter = netdev_priv(netdev);
1425 int i;
1426
1427 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
1428 kobject_put(&adapter->rx_buff_pool[i].kobj);
1429
1430 unregister_netdev(netdev);
1431
1432 free_netdev(netdev);
1433 dev_set_drvdata(&dev->dev, NULL);
1434
1435 return 0;
1436 }
1437
1438 static struct attribute veth_active_attr;
1439 static struct attribute veth_num_attr;
1440 static struct attribute veth_size_attr;
1441
1442 static ssize_t veth_pool_show(struct kobject *kobj,
1443 struct attribute *attr, char *buf)
1444 {
1445 struct ibmveth_buff_pool *pool = container_of(kobj,
1446 struct ibmveth_buff_pool,
1447 kobj);
1448
1449 if (attr == &veth_active_attr)
1450 return sprintf(buf, "%d\n", pool->active);
1451 else if (attr == &veth_num_attr)
1452 return sprintf(buf, "%d\n", pool->size);
1453 else if (attr == &veth_size_attr)
1454 return sprintf(buf, "%d\n", pool->buff_size);
1455 return 0;
1456 }
1457
1458 static ssize_t veth_pool_store(struct kobject *kobj, struct attribute *attr,
1459 const char *buf, size_t count)
1460 {
1461 struct ibmveth_buff_pool *pool = container_of(kobj,
1462 struct ibmveth_buff_pool,
1463 kobj);
1464 struct net_device *netdev = dev_get_drvdata(
1465 container_of(kobj->parent, struct device, kobj));
1466 struct ibmveth_adapter *adapter = netdev_priv(netdev);
1467 long value = simple_strtol(buf, NULL, 10);
1468 long rc;
1469
1470 if (attr == &veth_active_attr) {
1471 if (value && !pool->active) {
1472 if (netif_running(netdev)) {
1473 if (ibmveth_alloc_buffer_pool(pool)) {
1474 netdev_err(netdev,
1475 "unable to alloc pool\n");
1476 return -ENOMEM;
1477 }
1478 pool->active = 1;
1479 adapter->pool_config = 1;
1480 ibmveth_close(netdev);
1481 adapter->pool_config = 0;
1482 if ((rc = ibmveth_open(netdev)))
1483 return rc;
1484 } else {
1485 pool->active = 1;
1486 }
1487 } else if (!value && pool->active) {
1488 int mtu = netdev->mtu + IBMVETH_BUFF_OH;
1489 int i;
1490 /* Make sure there is a buffer pool with buffers that
1491 can hold a packet of the size of the MTU */
1492 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1493 if (pool == &adapter->rx_buff_pool[i])
1494 continue;
1495 if (!adapter->rx_buff_pool[i].active)
1496 continue;
1497 if (mtu <= adapter->rx_buff_pool[i].buff_size)
1498 break;
1499 }
1500
1501 if (i == IBMVETH_NUM_BUFF_POOLS) {
1502 netdev_err(netdev, "no active pool >= MTU\n");
1503 return -EPERM;
1504 }
1505
1506 if (netif_running(netdev)) {
1507 adapter->pool_config = 1;
1508 ibmveth_close(netdev);
1509 pool->active = 0;
1510 adapter->pool_config = 0;
1511 if ((rc = ibmveth_open(netdev)))
1512 return rc;
1513 }
1514 pool->active = 0;
1515 }
1516 } else if (attr == &veth_num_attr) {
1517 if (value <= 0 || value > IBMVETH_MAX_POOL_COUNT) {
1518 return -EINVAL;
1519 } else {
1520 if (netif_running(netdev)) {
1521 adapter->pool_config = 1;
1522 ibmveth_close(netdev);
1523 adapter->pool_config = 0;
1524 pool->size = value;
1525 if ((rc = ibmveth_open(netdev)))
1526 return rc;
1527 } else {
1528 pool->size = value;
1529 }
1530 }
1531 } else if (attr == &veth_size_attr) {
1532 if (value <= IBMVETH_BUFF_OH || value > IBMVETH_MAX_BUF_SIZE) {
1533 return -EINVAL;
1534 } else {
1535 if (netif_running(netdev)) {
1536 adapter->pool_config = 1;
1537 ibmveth_close(netdev);
1538 adapter->pool_config = 0;
1539 pool->buff_size = value;
1540 if ((rc = ibmveth_open(netdev)))
1541 return rc;
1542 } else {
1543 pool->buff_size = value;
1544 }
1545 }
1546 }
1547
1548 /* kick the interrupt handler to allocate/deallocate pools */
1549 ibmveth_interrupt(netdev->irq, netdev);
1550 return count;
1551 }
1552
1553
1554 #define ATTR(_name, _mode) \
1555 struct attribute veth_##_name##_attr = { \
1556 .name = __stringify(_name), .mode = _mode, \
1557 };
1558
1559 static ATTR(active, 0644);
1560 static ATTR(num, 0644);
1561 static ATTR(size, 0644);
1562
1563 static struct attribute *veth_pool_attrs[] = {
1564 &veth_active_attr,
1565 &veth_num_attr,
1566 &veth_size_attr,
1567 NULL,
1568 };
1569
1570 static const struct sysfs_ops veth_pool_ops = {
1571 .show = veth_pool_show,
1572 .store = veth_pool_store,
1573 };
1574
1575 static struct kobj_type ktype_veth_pool = {
1576 .release = NULL,
1577 .sysfs_ops = &veth_pool_ops,
1578 .default_attrs = veth_pool_attrs,
1579 };
1580
1581 static int ibmveth_resume(struct device *dev)
1582 {
1583 struct net_device *netdev = dev_get_drvdata(dev);
1584 ibmveth_interrupt(netdev->irq, netdev);
1585 return 0;
1586 }
1587
1588 static struct vio_device_id ibmveth_device_table[] = {
1589 { "network", "IBM,l-lan"},
1590 { "", "" }
1591 };
1592 MODULE_DEVICE_TABLE(vio, ibmveth_device_table);
1593
1594 static struct dev_pm_ops ibmveth_pm_ops = {
1595 .resume = ibmveth_resume
1596 };
1597
1598 static struct vio_driver ibmveth_driver = {
1599 .id_table = ibmveth_device_table,
1600 .probe = ibmveth_probe,
1601 .remove = ibmveth_remove,
1602 .get_desired_dma = ibmveth_get_desired_dma,
1603 .name = ibmveth_driver_name,
1604 .pm = &ibmveth_pm_ops,
1605 };
1606
1607 static int __init ibmveth_module_init(void)
1608 {
1609 printk(KERN_DEBUG "%s: %s %s\n", ibmveth_driver_name,
1610 ibmveth_driver_string, ibmveth_driver_version);
1611
1612 return vio_register_driver(&ibmveth_driver);
1613 }
1614
1615 static void __exit ibmveth_module_exit(void)
1616 {
1617 vio_unregister_driver(&ibmveth_driver);
1618 }
1619
1620 module_init(ibmveth_module_init);
1621 module_exit(ibmveth_module_exit);
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