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ARM: 7409/1: Do not call flush_cache_user_range with mmap_sem held
[linux/fpc-iii.git] / drivers / net / ibmveth.c
blob145c924e278f442b8bdfce9bca42b757079f5cba
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/mm.h>
38 #include <linux/pm.h>
39 #include <linux/ethtool.h>
40 #include <linux/in.h>
41 #include <linux/ip.h>
42 #include <linux/ipv6.h>
43 #include <linux/slab.h>
44 #include <asm/hvcall.h>
45 #include <asm/atomic.h>
46 #include <asm/vio.h>
47 #include <asm/iommu.h>
48 #include <asm/firmware.h>
49
50 #include "ibmveth.h"
51
52 static irqreturn_t ibmveth_interrupt(int irq, void *dev_instance);
53 static void ibmveth_rxq_harvest_buffer(struct ibmveth_adapter *adapter);
54 static unsigned long ibmveth_get_desired_dma(struct vio_dev *vdev);
55
56 static struct kobj_type ktype_veth_pool;
57
58
59 static const char ibmveth_driver_name[] = "ibmveth";
60 static const char ibmveth_driver_string[] = "IBM Power Virtual Ethernet Driver";
61 #define ibmveth_driver_version "1.04"
62
63 MODULE_AUTHOR("Santiago Leon <santil@linux.vnet.ibm.com>");
64 MODULE_DESCRIPTION("IBM Power Virtual Ethernet Driver");
65 MODULE_LICENSE("GPL");
66 MODULE_VERSION(ibmveth_driver_version);
67
68 static unsigned int tx_copybreak __read_mostly = 128;
69 module_param(tx_copybreak, uint, 0644);
70 MODULE_PARM_DESC(tx_copybreak,
71 "Maximum size of packet that is copied to a new buffer on transmit");
72
73 static unsigned int rx_copybreak __read_mostly = 128;
74 module_param(rx_copybreak, uint, 0644);
75 MODULE_PARM_DESC(rx_copybreak,
76 "Maximum size of packet that is copied to a new buffer on receive");
77
78 static unsigned int rx_flush __read_mostly = 0;
79 module_param(rx_flush, uint, 0644);
80 MODULE_PARM_DESC(rx_flush, "Flush receive buffers before use");
81
82 struct ibmveth_stat {
83 char name[ETH_GSTRING_LEN];
84 int offset;
85 };
86
87 #define IBMVETH_STAT_OFF(stat) offsetof(struct ibmveth_adapter, stat)
88 #define IBMVETH_GET_STAT(a, off) *((u64 *)(((unsigned long)(a)) + off))
89
90 struct ibmveth_stat ibmveth_stats[] = {
91 { "replenish_task_cycles", IBMVETH_STAT_OFF(replenish_task_cycles) },
92 { "replenish_no_mem", IBMVETH_STAT_OFF(replenish_no_mem) },
93 { "replenish_add_buff_failure",
94 IBMVETH_STAT_OFF(replenish_add_buff_failure) },
95 { "replenish_add_buff_success",
96 IBMVETH_STAT_OFF(replenish_add_buff_success) },
97 { "rx_invalid_buffer", IBMVETH_STAT_OFF(rx_invalid_buffer) },
98 { "rx_no_buffer", IBMVETH_STAT_OFF(rx_no_buffer) },
99 { "tx_map_failed", IBMVETH_STAT_OFF(tx_map_failed) },
100 { "tx_send_failed", IBMVETH_STAT_OFF(tx_send_failed) },
101 { "fw_enabled_ipv4_csum", IBMVETH_STAT_OFF(fw_ipv4_csum_support) },
102 { "fw_enabled_ipv6_csum", IBMVETH_STAT_OFF(fw_ipv6_csum_support) },
103 };
104
105 /* simple methods of getting data from the current rxq entry */
106 static inline u32 ibmveth_rxq_flags(struct ibmveth_adapter *adapter)
107 {
108 return adapter->rx_queue.queue_addr[adapter->rx_queue.index].flags_off;
109 }
110
111 static inline int ibmveth_rxq_toggle(struct ibmveth_adapter *adapter)
112 {
113 return (ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_TOGGLE) >>
114 IBMVETH_RXQ_TOGGLE_SHIFT;
115 }
116
117 static inline int ibmveth_rxq_pending_buffer(struct ibmveth_adapter *adapter)
118 {
119 return ibmveth_rxq_toggle(adapter) == adapter->rx_queue.toggle;
120 }
121
122 static inline int ibmveth_rxq_buffer_valid(struct ibmveth_adapter *adapter)
123 {
124 return ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_VALID;
125 }
126
127 static inline int ibmveth_rxq_frame_offset(struct ibmveth_adapter *adapter)
128 {
129 return ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_OFF_MASK;
130 }
131
132 static inline int ibmveth_rxq_frame_length(struct ibmveth_adapter *adapter)
133 {
134 return adapter->rx_queue.queue_addr[adapter->rx_queue.index].length;
135 }
136
137 static inline int ibmveth_rxq_csum_good(struct ibmveth_adapter *adapter)
138 {
139 return ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_CSUM_GOOD;
140 }
141
142 /* setup the initial settings for a buffer pool */
143 static void ibmveth_init_buffer_pool(struct ibmveth_buff_pool *pool,
144 u32 pool_index, u32 pool_size,
145 u32 buff_size, u32 pool_active)
146 {
147 pool->size = pool_size;
148 pool->index = pool_index;
149 pool->buff_size = buff_size;
150 pool->threshold = pool_size * 7 / 8;
151 pool->active = pool_active;
152 }
153
154 /* allocate and setup an buffer pool - called during open */
155 static int ibmveth_alloc_buffer_pool(struct ibmveth_buff_pool *pool)
156 {
157 int i;
158
159 pool->free_map = kmalloc(sizeof(u16) * pool->size, GFP_KERNEL);
160
161 if (!pool->free_map)
162 return -1;
163
164 pool->dma_addr = kmalloc(sizeof(dma_addr_t) * pool->size, GFP_KERNEL);
165 if (!pool->dma_addr) {
166 kfree(pool->free_map);
167 pool->free_map = NULL;
168 return -1;
169 }
170
171 pool->skbuff = kcalloc(pool->size, sizeof(void *), GFP_KERNEL);
172
173 if (!pool->skbuff) {
174 kfree(pool->dma_addr);
175 pool->dma_addr = NULL;
176
177 kfree(pool->free_map);
178 pool->free_map = NULL;
179 return -1;
180 }
181
182 memset(pool->dma_addr, 0, sizeof(dma_addr_t) * pool->size);
183
184 for (i = 0; i < pool->size; ++i)
185 pool->free_map[i] = i;
186
187 atomic_set(&pool->available, 0);
188 pool->producer_index = 0;
189 pool->consumer_index = 0;
190
191 return 0;
192 }
193
194 static inline void ibmveth_flush_buffer(void *addr, unsigned long length)
195 {
196 unsigned long offset;
197
198 for (offset = 0; offset < length; offset += SMP_CACHE_BYTES)
199 asm("dcbfl %0,%1" :: "b" (addr), "r" (offset));
200 }
201
202 /* replenish the buffers for a pool. note that we don't need to
203 * skb_reserve these since they are used for incoming...
204 */
205 static void ibmveth_replenish_buffer_pool(struct ibmveth_adapter *adapter,
206 struct ibmveth_buff_pool *pool)
207 {
208 u32 i;
209 u32 count = pool->size - atomic_read(&pool->available);
210 u32 buffers_added = 0;
211 struct sk_buff *skb;
212 unsigned int free_index, index;
213 u64 correlator;
214 unsigned long lpar_rc;
215 dma_addr_t dma_addr;
216
217 mb();
218
219 for (i = 0; i < count; ++i) {
220 union ibmveth_buf_desc desc;
221
222 skb = netdev_alloc_skb(adapter->netdev, pool->buff_size);
223
224 if (!skb) {
225 netdev_dbg(adapter->netdev,
226 "replenish: unable to allocate skb\n");
227 adapter->replenish_no_mem++;
228 break;
229 }
230
231 free_index = pool->consumer_index;
232 pool->consumer_index++;
233 if (pool->consumer_index >= pool->size)
234 pool->consumer_index = 0;
235 index = pool->free_map[free_index];
236
237 BUG_ON(index == IBM_VETH_INVALID_MAP);
238 BUG_ON(pool->skbuff[index] != NULL);
239
240 dma_addr = dma_map_single(&adapter->vdev->dev, skb->data,
241 pool->buff_size, DMA_FROM_DEVICE);
242
243 if (dma_mapping_error(&adapter->vdev->dev, dma_addr))
244 goto failure;
245
246 pool->free_map[free_index] = IBM_VETH_INVALID_MAP;
247 pool->dma_addr[index] = dma_addr;
248 pool->skbuff[index] = skb;
249
250 correlator = ((u64)pool->index << 32) | index;
251 *(u64 *)skb->data = correlator;
252
253 desc.fields.flags_len = IBMVETH_BUF_VALID | pool->buff_size;
254 desc.fields.address = dma_addr;
255
256 if (rx_flush) {
257 unsigned int len = min(pool->buff_size,
258 adapter->netdev->mtu +
259 IBMVETH_BUFF_OH);
260 ibmveth_flush_buffer(skb->data, len);
261 }
262 lpar_rc = h_add_logical_lan_buffer(adapter->vdev->unit_address,
263 desc.desc);
264
265 if (lpar_rc != H_SUCCESS) {
266 goto failure;
267 } else {
268 buffers_added++;
269 adapter->replenish_add_buff_success++;
270 }
271 }
272
273 mb();
274 atomic_add(buffers_added, &(pool->available));
275 return;
276
277 failure:
278 pool->free_map[free_index] = index;
279 pool->skbuff[index] = NULL;
280 if (pool->consumer_index == 0)
281 pool->consumer_index = pool->size - 1;
282 else
283 pool->consumer_index--;
284 if (!dma_mapping_error(&adapter->vdev->dev, dma_addr))
285 dma_unmap_single(&adapter->vdev->dev,
286 pool->dma_addr[index], pool->buff_size,
287 DMA_FROM_DEVICE);
288 dev_kfree_skb_any(skb);
289 adapter->replenish_add_buff_failure++;
290
291 mb();
292 atomic_add(buffers_added, &(pool->available));
293 }
294
295 /* replenish routine */
296 static void ibmveth_replenish_task(struct ibmveth_adapter *adapter)
297 {
298 int i;
299
300 adapter->replenish_task_cycles++;
301
302 for (i = (IBMVETH_NUM_BUFF_POOLS - 1); i >= 0; i--) {
303 struct ibmveth_buff_pool *pool = &adapter->rx_buff_pool[i];
304
305 if (pool->active &&
306 (atomic_read(&pool->available) < pool->threshold))
307 ibmveth_replenish_buffer_pool(adapter, pool);
308 }
309
310 adapter->rx_no_buffer = *(u64 *)(((char*)adapter->buffer_list_addr) +
311 4096 - 8);
312 }
313
314 /* empty and free ana buffer pool - also used to do cleanup in error paths */
315 static void ibmveth_free_buffer_pool(struct ibmveth_adapter *adapter,
316 struct ibmveth_buff_pool *pool)
317 {
318 int i;
319
320 kfree(pool->free_map);
321 pool->free_map = NULL;
322
323 if (pool->skbuff && pool->dma_addr) {
324 for (i = 0; i < pool->size; ++i) {
325 struct sk_buff *skb = pool->skbuff[i];
326 if (skb) {
327 dma_unmap_single(&adapter->vdev->dev,
328 pool->dma_addr[i],
329 pool->buff_size,
330 DMA_FROM_DEVICE);
331 dev_kfree_skb_any(skb);
332 pool->skbuff[i] = NULL;
333 }
334 }
335 }
336
337 if (pool->dma_addr) {
338 kfree(pool->dma_addr);
339 pool->dma_addr = NULL;
340 }
341
342 if (pool->skbuff) {
343 kfree(pool->skbuff);
344 pool->skbuff = NULL;
345 }
346 }
347
348 /* remove a buffer from a pool */
349 static void ibmveth_remove_buffer_from_pool(struct ibmveth_adapter *adapter,
350 u64 correlator)
351 {
352 unsigned int pool = correlator >> 32;
353 unsigned int index = correlator & 0xffffffffUL;
354 unsigned int free_index;
355 struct sk_buff *skb;
356
357 BUG_ON(pool >= IBMVETH_NUM_BUFF_POOLS);
358 BUG_ON(index >= adapter->rx_buff_pool[pool].size);
359
360 skb = adapter->rx_buff_pool[pool].skbuff[index];
361
362 BUG_ON(skb == NULL);
363
364 adapter->rx_buff_pool[pool].skbuff[index] = NULL;
365
366 dma_unmap_single(&adapter->vdev->dev,
367 adapter->rx_buff_pool[pool].dma_addr[index],
368 adapter->rx_buff_pool[pool].buff_size,
369 DMA_FROM_DEVICE);
370
371 free_index = adapter->rx_buff_pool[pool].producer_index;
372 adapter->rx_buff_pool[pool].producer_index++;
373 if (adapter->rx_buff_pool[pool].producer_index >=
374 adapter->rx_buff_pool[pool].size)
375 adapter->rx_buff_pool[pool].producer_index = 0;
376 adapter->rx_buff_pool[pool].free_map[free_index] = index;
377
378 mb();
379
380 atomic_dec(&(adapter->rx_buff_pool[pool].available));
381 }
382
383 /* get the current buffer on the rx queue */
384 static inline struct sk_buff *ibmveth_rxq_get_buffer(struct ibmveth_adapter *adapter)
385 {
386 u64 correlator = adapter->rx_queue.queue_addr[adapter->rx_queue.index].correlator;
387 unsigned int pool = correlator >> 32;
388 unsigned int index = correlator & 0xffffffffUL;
389
390 BUG_ON(pool >= IBMVETH_NUM_BUFF_POOLS);
391 BUG_ON(index >= adapter->rx_buff_pool[pool].size);
392
393 return adapter->rx_buff_pool[pool].skbuff[index];
394 }
395
396 /* recycle the current buffer on the rx queue */
397 static int ibmveth_rxq_recycle_buffer(struct ibmveth_adapter *adapter)
398 {
399 u32 q_index = adapter->rx_queue.index;
400 u64 correlator = adapter->rx_queue.queue_addr[q_index].correlator;
401 unsigned int pool = correlator >> 32;
402 unsigned int index = correlator & 0xffffffffUL;
403 union ibmveth_buf_desc desc;
404 unsigned long lpar_rc;
405 int ret = 1;
406
407 BUG_ON(pool >= IBMVETH_NUM_BUFF_POOLS);
408 BUG_ON(index >= adapter->rx_buff_pool[pool].size);
409
410 if (!adapter->rx_buff_pool[pool].active) {
411 ibmveth_rxq_harvest_buffer(adapter);
412 ibmveth_free_buffer_pool(adapter, &adapter->rx_buff_pool[pool]);
413 goto out;
414 }
415
416 desc.fields.flags_len = IBMVETH_BUF_VALID |
417 adapter->rx_buff_pool[pool].buff_size;
418 desc.fields.address = adapter->rx_buff_pool[pool].dma_addr[index];
419
420 lpar_rc = h_add_logical_lan_buffer(adapter->vdev->unit_address, desc.desc);
421
422 if (lpar_rc != H_SUCCESS) {
423 netdev_dbg(adapter->netdev, "h_add_logical_lan_buffer failed "
424 "during recycle rc=%ld", lpar_rc);
425 ibmveth_remove_buffer_from_pool(adapter, adapter->rx_queue.queue_addr[adapter->rx_queue.index].correlator);
426 ret = 0;
427 }
428
429 if (++adapter->rx_queue.index == adapter->rx_queue.num_slots) {
430 adapter->rx_queue.index = 0;
431 adapter->rx_queue.toggle = !adapter->rx_queue.toggle;
432 }
433
434 out:
435 return ret;
436 }
437
438 static void ibmveth_rxq_harvest_buffer(struct ibmveth_adapter *adapter)
439 {
440 ibmveth_remove_buffer_from_pool(adapter, adapter->rx_queue.queue_addr[adapter->rx_queue.index].correlator);
441
442 if (++adapter->rx_queue.index == adapter->rx_queue.num_slots) {
443 adapter->rx_queue.index = 0;
444 adapter->rx_queue.toggle = !adapter->rx_queue.toggle;
445 }
446 }
447
448 static void ibmveth_cleanup(struct ibmveth_adapter *adapter)
449 {
450 int i;
451 struct device *dev = &adapter->vdev->dev;
452
453 if (adapter->buffer_list_addr != NULL) {
454 if (!dma_mapping_error(dev, adapter->buffer_list_dma)) {
455 dma_unmap_single(dev, adapter->buffer_list_dma, 4096,
456 DMA_BIDIRECTIONAL);
457 adapter->buffer_list_dma = DMA_ERROR_CODE;
458 }
459 free_page((unsigned long)adapter->buffer_list_addr);
460 adapter->buffer_list_addr = NULL;
461 }
462
463 if (adapter->filter_list_addr != NULL) {
464 if (!dma_mapping_error(dev, adapter->filter_list_dma)) {
465 dma_unmap_single(dev, adapter->filter_list_dma, 4096,
466 DMA_BIDIRECTIONAL);
467 adapter->filter_list_dma = DMA_ERROR_CODE;
468 }
469 free_page((unsigned long)adapter->filter_list_addr);
470 adapter->filter_list_addr = NULL;
471 }
472
473 if (adapter->rx_queue.queue_addr != NULL) {
474 if (!dma_mapping_error(dev, adapter->rx_queue.queue_dma)) {
475 dma_unmap_single(dev,
476 adapter->rx_queue.queue_dma,
477 adapter->rx_queue.queue_len,
478 DMA_BIDIRECTIONAL);
479 adapter->rx_queue.queue_dma = DMA_ERROR_CODE;
480 }
481 kfree(adapter->rx_queue.queue_addr);
482 adapter->rx_queue.queue_addr = NULL;
483 }
484
485 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
486 if (adapter->rx_buff_pool[i].active)
487 ibmveth_free_buffer_pool(adapter,
488 &adapter->rx_buff_pool[i]);
489
490 if (adapter->bounce_buffer != NULL) {
491 if (!dma_mapping_error(dev, adapter->bounce_buffer_dma)) {
492 dma_unmap_single(&adapter->vdev->dev,
493 adapter->bounce_buffer_dma,
494 adapter->netdev->mtu + IBMVETH_BUFF_OH,
495 DMA_BIDIRECTIONAL);
496 adapter->bounce_buffer_dma = DMA_ERROR_CODE;
497 }
498 kfree(adapter->bounce_buffer);
499 adapter->bounce_buffer = NULL;
500 }
501 }
502
503 static int ibmveth_register_logical_lan(struct ibmveth_adapter *adapter,
504 union ibmveth_buf_desc rxq_desc, u64 mac_address)
505 {
506 int rc, try_again = 1;
507
508 /*
509 * After a kexec the adapter will still be open, so our attempt to
510 * open it will fail. So if we get a failure we free the adapter and
511 * try again, but only once.
512 */
513 retry:
514 rc = h_register_logical_lan(adapter->vdev->unit_address,
515 adapter->buffer_list_dma, rxq_desc.desc,
516 adapter->filter_list_dma, mac_address);
517
518 if (rc != H_SUCCESS && try_again) {
519 do {
520 rc = h_free_logical_lan(adapter->vdev->unit_address);
521 } while (H_IS_LONG_BUSY(rc) || (rc == H_BUSY));
522
523 try_again = 0;
524 goto retry;
525 }
526
527 return rc;
528 }
529
530 static int ibmveth_open(struct net_device *netdev)
531 {
532 struct ibmveth_adapter *adapter = netdev_priv(netdev);
533 u64 mac_address = 0;
534 int rxq_entries = 1;
535 unsigned long lpar_rc;
536 int rc;
537 union ibmveth_buf_desc rxq_desc;
538 int i;
539 struct device *dev;
540
541 netdev_dbg(netdev, "open starting\n");
542
543 napi_enable(&adapter->napi);
544
545 for(i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
546 rxq_entries += adapter->rx_buff_pool[i].size;
547
548 adapter->buffer_list_addr = (void*) get_zeroed_page(GFP_KERNEL);
549 adapter->filter_list_addr = (void*) get_zeroed_page(GFP_KERNEL);
550
551 if (!adapter->buffer_list_addr || !adapter->filter_list_addr) {
552 netdev_err(netdev, "unable to allocate filter or buffer list "
553 "pages\n");
554 rc = -ENOMEM;
555 goto err_out;
556 }
557
558 adapter->rx_queue.queue_len = sizeof(struct ibmveth_rx_q_entry) *
559 rxq_entries;
560 adapter->rx_queue.queue_addr = kmalloc(adapter->rx_queue.queue_len,
561 GFP_KERNEL);
562
563 if (!adapter->rx_queue.queue_addr) {
564 netdev_err(netdev, "unable to allocate rx queue pages\n");
565 rc = -ENOMEM;
566 goto err_out;
567 }
568
569 dev = &adapter->vdev->dev;
570
571 adapter->buffer_list_dma = dma_map_single(dev,
572 adapter->buffer_list_addr, 4096, DMA_BIDIRECTIONAL);
573 adapter->filter_list_dma = dma_map_single(dev,
574 adapter->filter_list_addr, 4096, DMA_BIDIRECTIONAL);
575 adapter->rx_queue.queue_dma = dma_map_single(dev,
576 adapter->rx_queue.queue_addr,
577 adapter->rx_queue.queue_len, DMA_BIDIRECTIONAL);
578
579 if ((dma_mapping_error(dev, adapter->buffer_list_dma)) ||
580 (dma_mapping_error(dev, adapter->filter_list_dma)) ||
581 (dma_mapping_error(dev, adapter->rx_queue.queue_dma))) {
582 netdev_err(netdev, "unable to map filter or buffer list "
583 "pages\n");
584 rc = -ENOMEM;
585 goto err_out;
586 }
587
588 adapter->rx_queue.index = 0;
589 adapter->rx_queue.num_slots = rxq_entries;
590 adapter->rx_queue.toggle = 1;
591
592 memcpy(&mac_address, netdev->dev_addr, netdev->addr_len);
593 mac_address = mac_address >> 16;
594
595 rxq_desc.fields.flags_len = IBMVETH_BUF_VALID |
596 adapter->rx_queue.queue_len;
597 rxq_desc.fields.address = adapter->rx_queue.queue_dma;
598
599 netdev_dbg(netdev, "buffer list @ 0x%p\n", adapter->buffer_list_addr);
600 netdev_dbg(netdev, "filter list @ 0x%p\n", adapter->filter_list_addr);
601 netdev_dbg(netdev, "receive q @ 0x%p\n", adapter->rx_queue.queue_addr);
602
603 h_vio_signal(adapter->vdev->unit_address, VIO_IRQ_DISABLE);
604
605 lpar_rc = ibmveth_register_logical_lan(adapter, rxq_desc, mac_address);
606
607 if (lpar_rc != H_SUCCESS) {
608 netdev_err(netdev, "h_register_logical_lan failed with %ld\n",
609 lpar_rc);
610 netdev_err(netdev, "buffer TCE:0x%llx filter TCE:0x%llx rxq "
611 "desc:0x%llx MAC:0x%llx\n",
612 adapter->buffer_list_dma,
613 adapter->filter_list_dma,
614 rxq_desc.desc,
615 mac_address);
616 rc = -ENONET;
617 goto err_out;
618 }
619
620 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
621 if (!adapter->rx_buff_pool[i].active)
622 continue;
623 if (ibmveth_alloc_buffer_pool(&adapter->rx_buff_pool[i])) {
624 netdev_err(netdev, "unable to alloc pool\n");
625 adapter->rx_buff_pool[i].active = 0;
626 rc = -ENOMEM;
627 goto err_out;
628 }
629 }
630
631 netdev_dbg(netdev, "registering irq 0x%x\n", netdev->irq);
632 rc = request_irq(netdev->irq, ibmveth_interrupt, 0, netdev->name,
633 netdev);
634 if (rc != 0) {
635 netdev_err(netdev, "unable to request irq 0x%x, rc %d\n",
636 netdev->irq, rc);
637 do {
638 rc = h_free_logical_lan(adapter->vdev->unit_address);
639 } while (H_IS_LONG_BUSY(rc) || (rc == H_BUSY));
640
641 goto err_out;
642 }
643
644 adapter->bounce_buffer =
645 kmalloc(netdev->mtu + IBMVETH_BUFF_OH, GFP_KERNEL);
646 if (!adapter->bounce_buffer) {
647 netdev_err(netdev, "unable to allocate bounce buffer\n");
648 rc = -ENOMEM;
649 goto err_out_free_irq;
650 }
651 adapter->bounce_buffer_dma =
652 dma_map_single(&adapter->vdev->dev, adapter->bounce_buffer,
653 netdev->mtu + IBMVETH_BUFF_OH, DMA_BIDIRECTIONAL);
654 if (dma_mapping_error(dev, adapter->bounce_buffer_dma)) {
655 netdev_err(netdev, "unable to map bounce buffer\n");
656 rc = -ENOMEM;
657 goto err_out_free_irq;
658 }
659
660 netdev_dbg(netdev, "initial replenish cycle\n");
661 ibmveth_interrupt(netdev->irq, netdev);
662
663 netif_start_queue(netdev);
664
665 netdev_dbg(netdev, "open complete\n");
666
667 return 0;
668
669 err_out_free_irq:
670 free_irq(netdev->irq, netdev);
671 err_out:
672 ibmveth_cleanup(adapter);
673 napi_disable(&adapter->napi);
674 return rc;
675 }
676
677 static int ibmveth_close(struct net_device *netdev)
678 {
679 struct ibmveth_adapter *adapter = netdev_priv(netdev);
680 long lpar_rc;
681
682 netdev_dbg(netdev, "close starting\n");
683
684 napi_disable(&adapter->napi);
685
686 if (!adapter->pool_config)
687 netif_stop_queue(netdev);
688
689 h_vio_signal(adapter->vdev->unit_address, VIO_IRQ_DISABLE);
690
691 do {
692 lpar_rc = h_free_logical_lan(adapter->vdev->unit_address);
693 } while (H_IS_LONG_BUSY(lpar_rc) || (lpar_rc == H_BUSY));
694
695 if (lpar_rc != H_SUCCESS) {
696 netdev_err(netdev, "h_free_logical_lan failed with %lx, "
697 "continuing with close\n", lpar_rc);
698 }
699
700 free_irq(netdev->irq, netdev);
701
702 adapter->rx_no_buffer = *(u64 *)(((char *)adapter->buffer_list_addr) +
703 4096 - 8);
704
705 ibmveth_cleanup(adapter);
706
707 netdev_dbg(netdev, "close complete\n");
708
709 return 0;
710 }
711
712 static int netdev_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
713 {
714 cmd->supported = (SUPPORTED_1000baseT_Full | SUPPORTED_Autoneg |
715 SUPPORTED_FIBRE);
716 cmd->advertising = (ADVERTISED_1000baseT_Full | ADVERTISED_Autoneg |
717 ADVERTISED_FIBRE);
718 ethtool_cmd_speed_set(cmd, SPEED_1000);
719 cmd->duplex = DUPLEX_FULL;
720 cmd->port = PORT_FIBRE;
721 cmd->phy_address = 0;
722 cmd->transceiver = XCVR_INTERNAL;
723 cmd->autoneg = AUTONEG_ENABLE;
724 cmd->maxtxpkt = 0;
725 cmd->maxrxpkt = 1;
726 return 0;
727 }
728
729 static void netdev_get_drvinfo(struct net_device *dev,
730 struct ethtool_drvinfo *info)
731 {
732 strncpy(info->driver, ibmveth_driver_name, sizeof(info->driver) - 1);
733 strncpy(info->version, ibmveth_driver_version,
734 sizeof(info->version) - 1);
735 }
736
737 static u32 ibmveth_fix_features(struct net_device *dev, u32 features)
738 {
739 /*
740 * Since the ibmveth firmware interface does not have the
741 * concept of separate tx/rx checksum offload enable, if rx
742 * checksum is disabled we also have to disable tx checksum
743 * offload. Once we disable rx checksum offload, we are no
744 * longer allowed to send tx buffers that are not properly
745 * checksummed.
746 */
747
748 if (!(features & NETIF_F_RXCSUM))
749 features &= ~NETIF_F_ALL_CSUM;
750
751 return features;
752 }
753
754 static int ibmveth_set_csum_offload(struct net_device *dev, u32 data)
755 {
756 struct ibmveth_adapter *adapter = netdev_priv(dev);
757 unsigned long set_attr, clr_attr, ret_attr;
758 unsigned long set_attr6, clr_attr6;
759 long ret, ret6;
760 int rc1 = 0, rc2 = 0;
761 int restart = 0;
762
763 if (netif_running(dev)) {
764 restart = 1;
765 adapter->pool_config = 1;
766 ibmveth_close(dev);
767 adapter->pool_config = 0;
768 }
769
770 set_attr = 0;
771 clr_attr = 0;
772
773 if (data) {
774 set_attr = IBMVETH_ILLAN_IPV4_TCP_CSUM;
775 set_attr6 = IBMVETH_ILLAN_IPV6_TCP_CSUM;
776 } else {
777 clr_attr = IBMVETH_ILLAN_IPV4_TCP_CSUM;
778 clr_attr6 = IBMVETH_ILLAN_IPV6_TCP_CSUM;
779 }
780
781 ret = h_illan_attributes(adapter->vdev->unit_address, 0, 0, &ret_attr);
782
783 if (ret == H_SUCCESS && !(ret_attr & IBMVETH_ILLAN_ACTIVE_TRUNK) &&
784 !(ret_attr & IBMVETH_ILLAN_TRUNK_PRI_MASK) &&
785 (ret_attr & IBMVETH_ILLAN_PADDED_PKT_CSUM)) {
786 ret = h_illan_attributes(adapter->vdev->unit_address, clr_attr,
787 set_attr, &ret_attr);
788
789 if (ret != H_SUCCESS) {
790 netdev_err(dev, "unable to change IPv4 checksum "
791 "offload settings. %d rc=%ld\n",
792 data, ret);
793
794 ret = h_illan_attributes(adapter->vdev->unit_address,
795 set_attr, clr_attr, &ret_attr);
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, ret);
807
808 ret = h_illan_attributes(adapter->vdev->unit_address,
809 set_attr6, clr_attr6,
810 &ret_attr);
811 } else
812 adapter->fw_ipv6_csum_support = data;
813
814 if (ret == H_SUCCESS || ret6 == H_SUCCESS)
815 adapter->rx_csum = data;
816 else
817 rc1 = -EIO;
818 } else {
819 rc1 = -EIO;
820 netdev_err(dev, "unable to change checksum offload settings."
821 " %d rc=%ld ret_attr=%lx\n", data, ret,
822 ret_attr);
823 }
824
825 if (restart)
826 rc2 = ibmveth_open(dev);
827
828 return rc1 ? rc1 : rc2;
829 }
830
831 static int ibmveth_set_features(struct net_device *dev, u32 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 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1008
1009 dma_addr = dma_map_page(&adapter->vdev->dev, frag->page,
1010 frag->page_offset, frag->size,
1011 DMA_TO_DEVICE);
1012
1013 if (dma_mapping_error(&adapter->vdev->dev, dma_addr))
1014 goto map_failed_frags;
1015
1016 descs[i+1].fields.flags_len = desc_flags | frag->size;
1017 descs[i+1].fields.address = dma_addr;
1018 }
1019
1020 if (ibmveth_send(adapter, descs)) {
1021 adapter->tx_send_failed++;
1022 netdev->stats.tx_dropped++;
1023 } else {
1024 netdev->stats.tx_packets++;
1025 netdev->stats.tx_bytes += skb->len;
1026 }
1027
1028 dma_unmap_single(&adapter->vdev->dev,
1029 descs[0].fields.address,
1030 descs[0].fields.flags_len & IBMVETH_BUF_LEN_MASK,
1031 DMA_TO_DEVICE);
1032
1033 for (i = 1; i < skb_shinfo(skb)->nr_frags + 1; i++)
1034 dma_unmap_page(&adapter->vdev->dev, descs[i].fields.address,
1035 descs[i].fields.flags_len & IBMVETH_BUF_LEN_MASK,
1036 DMA_TO_DEVICE);
1037
1038 out:
1039 dev_kfree_skb(skb);
1040 return NETDEV_TX_OK;
1041
1042 map_failed_frags:
1043 last = i+1;
1044 for (i = 0; i < last; i++)
1045 dma_unmap_page(&adapter->vdev->dev, descs[i].fields.address,
1046 descs[i].fields.flags_len & IBMVETH_BUF_LEN_MASK,
1047 DMA_TO_DEVICE);
1048
1049 map_failed:
1050 if (!firmware_has_feature(FW_FEATURE_CMO))
1051 netdev_err(netdev, "tx: unable to map xmit buffer\n");
1052 adapter->tx_map_failed++;
1053 skb_linearize(skb);
1054 force_bounce = 1;
1055 goto retry_bounce;
1056 }
1057
1058 static int ibmveth_poll(struct napi_struct *napi, int budget)
1059 {
1060 struct ibmveth_adapter *adapter =
1061 container_of(napi, struct ibmveth_adapter, napi);
1062 struct net_device *netdev = adapter->netdev;
1063 int frames_processed = 0;
1064 unsigned long lpar_rc;
1065
1066 restart_poll:
1067 do {
1068 if (!ibmveth_rxq_pending_buffer(adapter))
1069 break;
1070
1071 smp_rmb();
1072 if (!ibmveth_rxq_buffer_valid(adapter)) {
1073 wmb(); /* suggested by larson1 */
1074 adapter->rx_invalid_buffer++;
1075 netdev_dbg(netdev, "recycling invalid buffer\n");
1076 ibmveth_rxq_recycle_buffer(adapter);
1077 } else {
1078 struct sk_buff *skb, *new_skb;
1079 int length = ibmveth_rxq_frame_length(adapter);
1080 int offset = ibmveth_rxq_frame_offset(adapter);
1081 int csum_good = ibmveth_rxq_csum_good(adapter);
1082
1083 skb = ibmveth_rxq_get_buffer(adapter);
1084
1085 new_skb = NULL;
1086 if (length < rx_copybreak)
1087 new_skb = netdev_alloc_skb(netdev, length);
1088
1089 if (new_skb) {
1090 skb_copy_to_linear_data(new_skb,
1091 skb->data + offset,
1092 length);
1093 if (rx_flush)
1094 ibmveth_flush_buffer(skb->data,
1095 length + offset);
1096 if (!ibmveth_rxq_recycle_buffer(adapter))
1097 kfree_skb(skb);
1098 skb = new_skb;
1099 } else {
1100 ibmveth_rxq_harvest_buffer(adapter);
1101 skb_reserve(skb, offset);
1102 }
1103
1104 skb_put(skb, length);
1105 skb->protocol = eth_type_trans(skb, netdev);
1106
1107 if (csum_good)
1108 skb->ip_summed = CHECKSUM_UNNECESSARY;
1109
1110 netif_receive_skb(skb); /* send it up */
1111
1112 netdev->stats.rx_packets++;
1113 netdev->stats.rx_bytes += length;
1114 frames_processed++;
1115 }
1116 } while (frames_processed < budget);
1117
1118 ibmveth_replenish_task(adapter);
1119
1120 if (frames_processed < budget) {
1121 /* We think we are done - reenable interrupts,
1122 * then check once more to make sure we are done.
1123 */
1124 lpar_rc = h_vio_signal(adapter->vdev->unit_address,
1125 VIO_IRQ_ENABLE);
1126
1127 BUG_ON(lpar_rc != H_SUCCESS);
1128
1129 napi_complete(napi);
1130
1131 if (ibmveth_rxq_pending_buffer(adapter) &&
1132 napi_reschedule(napi)) {
1133 lpar_rc = h_vio_signal(adapter->vdev->unit_address,
1134 VIO_IRQ_DISABLE);
1135 goto restart_poll;
1136 }
1137 }
1138
1139 return frames_processed;
1140 }
1141
1142 static irqreturn_t ibmveth_interrupt(int irq, void *dev_instance)
1143 {
1144 struct net_device *netdev = dev_instance;
1145 struct ibmveth_adapter *adapter = netdev_priv(netdev);
1146 unsigned long lpar_rc;
1147
1148 if (napi_schedule_prep(&adapter->napi)) {
1149 lpar_rc = h_vio_signal(adapter->vdev->unit_address,
1150 VIO_IRQ_DISABLE);
1151 BUG_ON(lpar_rc != H_SUCCESS);
1152 __napi_schedule(&adapter->napi);
1153 }
1154 return IRQ_HANDLED;
1155 }
1156
1157 static void ibmveth_set_multicast_list(struct net_device *netdev)
1158 {
1159 struct ibmveth_adapter *adapter = netdev_priv(netdev);
1160 unsigned long lpar_rc;
1161
1162 if ((netdev->flags & IFF_PROMISC) ||
1163 (netdev_mc_count(netdev) > adapter->mcastFilterSize)) {
1164 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1165 IbmVethMcastEnableRecv |
1166 IbmVethMcastDisableFiltering,
1167 0);
1168 if (lpar_rc != H_SUCCESS) {
1169 netdev_err(netdev, "h_multicast_ctrl rc=%ld when "
1170 "entering promisc mode\n", lpar_rc);
1171 }
1172 } else {
1173 struct netdev_hw_addr *ha;
1174 /* clear the filter table & disable filtering */
1175 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1176 IbmVethMcastEnableRecv |
1177 IbmVethMcastDisableFiltering |
1178 IbmVethMcastClearFilterTable,
1179 0);
1180 if (lpar_rc != H_SUCCESS) {
1181 netdev_err(netdev, "h_multicast_ctrl rc=%ld when "
1182 "attempting to clear filter table\n",
1183 lpar_rc);
1184 }
1185 /* add the addresses to the filter table */
1186 netdev_for_each_mc_addr(ha, netdev) {
1187 /* add the multicast address to the filter table */
1188 unsigned long mcast_addr = 0;
1189 memcpy(((char *)&mcast_addr)+2, ha->addr, 6);
1190 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1191 IbmVethMcastAddFilter,
1192 mcast_addr);
1193 if (lpar_rc != H_SUCCESS) {
1194 netdev_err(netdev, "h_multicast_ctrl rc=%ld "
1195 "when adding an entry to the filter "
1196 "table\n", lpar_rc);
1197 }
1198 }
1199
1200 /* re-enable filtering */
1201 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1202 IbmVethMcastEnableFiltering,
1203 0);
1204 if (lpar_rc != H_SUCCESS) {
1205 netdev_err(netdev, "h_multicast_ctrl rc=%ld when "
1206 "enabling filtering\n", lpar_rc);
1207 }
1208 }
1209 }
1210
1211 static int ibmveth_change_mtu(struct net_device *dev, int new_mtu)
1212 {
1213 struct ibmveth_adapter *adapter = netdev_priv(dev);
1214 struct vio_dev *viodev = adapter->vdev;
1215 int new_mtu_oh = new_mtu + IBMVETH_BUFF_OH;
1216 int i, rc;
1217 int need_restart = 0;
1218
1219 if (new_mtu < IBMVETH_MIN_MTU)
1220 return -EINVAL;
1221
1222 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
1223 if (new_mtu_oh < adapter->rx_buff_pool[i].buff_size)
1224 break;
1225
1226 if (i == IBMVETH_NUM_BUFF_POOLS)
1227 return -EINVAL;
1228
1229 /* Deactivate all the buffer pools so that the next loop can activate
1230 only the buffer pools necessary to hold the new MTU */
1231 if (netif_running(adapter->netdev)) {
1232 need_restart = 1;
1233 adapter->pool_config = 1;
1234 ibmveth_close(adapter->netdev);
1235 adapter->pool_config = 0;
1236 }
1237
1238 /* Look for an active buffer pool that can hold the new MTU */
1239 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1240 adapter->rx_buff_pool[i].active = 1;
1241
1242 if (new_mtu_oh < adapter->rx_buff_pool[i].buff_size) {
1243 dev->mtu = new_mtu;
1244 vio_cmo_set_dev_desired(viodev,
1245 ibmveth_get_desired_dma
1246 (viodev));
1247 if (need_restart) {
1248 return ibmveth_open(adapter->netdev);
1249 }
1250 return 0;
1251 }
1252 }
1253
1254 if (need_restart && (rc = ibmveth_open(adapter->netdev)))
1255 return rc;
1256
1257 return -EINVAL;
1258 }
1259
1260 #ifdef CONFIG_NET_POLL_CONTROLLER
1261 static void ibmveth_poll_controller(struct net_device *dev)
1262 {
1263 ibmveth_replenish_task(netdev_priv(dev));
1264 ibmveth_interrupt(dev->irq, dev);
1265 }
1266 #endif
1267
1268 /**
1269 * ibmveth_get_desired_dma - Calculate IO memory desired by the driver
1270 *
1271 * @vdev: struct vio_dev for the device whose desired IO mem is to be returned
1272 *
1273 * Return value:
1274 * Number of bytes of IO data the driver will need to perform well.
1275 */
1276 static unsigned long ibmveth_get_desired_dma(struct vio_dev *vdev)
1277 {
1278 struct net_device *netdev = dev_get_drvdata(&vdev->dev);
1279 struct ibmveth_adapter *adapter;
1280 unsigned long ret;
1281 int i;
1282 int rxqentries = 1;
1283
1284 /* netdev inits at probe time along with the structures we need below*/
1285 if (netdev == NULL)
1286 return IOMMU_PAGE_ALIGN(IBMVETH_IO_ENTITLEMENT_DEFAULT);
1287
1288 adapter = netdev_priv(netdev);
1289
1290 ret = IBMVETH_BUFF_LIST_SIZE + IBMVETH_FILT_LIST_SIZE;
1291 ret += IOMMU_PAGE_ALIGN(netdev->mtu);
1292
1293 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1294 /* add the size of the active receive buffers */
1295 if (adapter->rx_buff_pool[i].active)
1296 ret +=
1297 adapter->rx_buff_pool[i].size *
1298 IOMMU_PAGE_ALIGN(adapter->rx_buff_pool[i].
1299 buff_size);
1300 rxqentries += adapter->rx_buff_pool[i].size;
1301 }
1302 /* add the size of the receive queue entries */
1303 ret += IOMMU_PAGE_ALIGN(rxqentries * sizeof(struct ibmveth_rx_q_entry));
1304
1305 return ret;
1306 }
1307
1308 static const struct net_device_ops ibmveth_netdev_ops = {
1309 .ndo_open = ibmveth_open,
1310 .ndo_stop = ibmveth_close,
1311 .ndo_start_xmit = ibmveth_start_xmit,
1312 .ndo_set_multicast_list = ibmveth_set_multicast_list,
1313 .ndo_do_ioctl = ibmveth_ioctl,
1314 .ndo_change_mtu = ibmveth_change_mtu,
1315 .ndo_fix_features = ibmveth_fix_features,
1316 .ndo_set_features = ibmveth_set_features,
1317 .ndo_validate_addr = eth_validate_addr,
1318 .ndo_set_mac_address = eth_mac_addr,
1319 #ifdef CONFIG_NET_POLL_CONTROLLER
1320 .ndo_poll_controller = ibmveth_poll_controller,
1321 #endif
1322 };
1323
1324 static int __devinit ibmveth_probe(struct vio_dev *dev,
1325 const struct vio_device_id *id)
1326 {
1327 int rc, i;
1328 struct net_device *netdev;
1329 struct ibmveth_adapter *adapter;
1330 unsigned char *mac_addr_p;
1331 unsigned int *mcastFilterSize_p;
1332
1333 dev_dbg(&dev->dev, "entering ibmveth_probe for UA 0x%x\n",
1334 dev->unit_address);
1335
1336 mac_addr_p = (unsigned char *)vio_get_attribute(dev, VETH_MAC_ADDR,
1337 NULL);
1338 if (!mac_addr_p) {
1339 dev_err(&dev->dev, "Can't find VETH_MAC_ADDR attribute\n");
1340 return -EINVAL;
1341 }
1342
1343 mcastFilterSize_p = (unsigned int *)vio_get_attribute(dev,
1344 VETH_MCAST_FILTER_SIZE, NULL);
1345 if (!mcastFilterSize_p) {
1346 dev_err(&dev->dev, "Can't find VETH_MCAST_FILTER_SIZE "
1347 "attribute\n");
1348 return -EINVAL;
1349 }
1350
1351 netdev = alloc_etherdev(sizeof(struct ibmveth_adapter));
1352
1353 if (!netdev)
1354 return -ENOMEM;
1355
1356 adapter = netdev_priv(netdev);
1357 dev_set_drvdata(&dev->dev, netdev);
1358
1359 adapter->vdev = dev;
1360 adapter->netdev = netdev;
1361 adapter->mcastFilterSize = *mcastFilterSize_p;
1362 adapter->pool_config = 0;
1363
1364 netif_napi_add(netdev, &adapter->napi, ibmveth_poll, 16);
1365
1366 /*
1367 * Some older boxes running PHYP non-natively have an OF that returns
1368 * a 8-byte local-mac-address field (and the first 2 bytes have to be
1369 * ignored) while newer boxes' OF return a 6-byte field. Note that
1370 * IEEE 1275 specifies that local-mac-address must be a 6-byte field.
1371 * The RPA doc specifies that the first byte must be 10b, so we'll
1372 * just look for it to solve this 8 vs. 6 byte field issue
1373 */
1374 if ((*mac_addr_p & 0x3) != 0x02)
1375 mac_addr_p += 2;
1376
1377 adapter->mac_addr = 0;
1378 memcpy(&adapter->mac_addr, mac_addr_p, 6);
1379
1380 netdev->irq = dev->irq;
1381 netdev->netdev_ops = &ibmveth_netdev_ops;
1382 netdev->ethtool_ops = &netdev_ethtool_ops;
1383 SET_NETDEV_DEV(netdev, &dev->dev);
1384 netdev->hw_features = NETIF_F_SG | NETIF_F_RXCSUM |
1385 NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;
1386 netdev->features |= netdev->hw_features;
1387
1388 memcpy(netdev->dev_addr, &adapter->mac_addr, netdev->addr_len);
1389
1390 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1391 struct kobject *kobj = &adapter->rx_buff_pool[i].kobj;
1392 int error;
1393
1394 ibmveth_init_buffer_pool(&adapter->rx_buff_pool[i], i,
1395 pool_count[i], pool_size[i],
1396 pool_active[i]);
1397 error = kobject_init_and_add(kobj, &ktype_veth_pool,
1398 &dev->dev.kobj, "pool%d", i);
1399 if (!error)
1400 kobject_uevent(kobj, KOBJ_ADD);
1401 }
1402
1403 netdev_dbg(netdev, "adapter @ 0x%p\n", adapter);
1404
1405 adapter->buffer_list_dma = DMA_ERROR_CODE;
1406 adapter->filter_list_dma = DMA_ERROR_CODE;
1407 adapter->rx_queue.queue_dma = DMA_ERROR_CODE;
1408
1409 netdev_dbg(netdev, "registering netdev...\n");
1410
1411 ibmveth_set_features(netdev, netdev->features);
1412
1413 rc = register_netdev(netdev);
1414
1415 if (rc) {
1416 netdev_dbg(netdev, "failed to register netdev rc=%d\n", rc);
1417 free_netdev(netdev);
1418 return rc;
1419 }
1420
1421 netdev_dbg(netdev, "registered\n");
1422
1423 return 0;
1424 }
1425
1426 static int __devexit ibmveth_remove(struct vio_dev *dev)
1427 {
1428 struct net_device *netdev = dev_get_drvdata(&dev->dev);
1429 struct ibmveth_adapter *adapter = netdev_priv(netdev);
1430 int i;
1431
1432 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
1433 kobject_put(&adapter->rx_buff_pool[i].kobj);
1434
1435 unregister_netdev(netdev);
1436
1437 free_netdev(netdev);
1438 dev_set_drvdata(&dev->dev, NULL);
1439
1440 return 0;
1441 }
1442
1443 static struct attribute veth_active_attr;
1444 static struct attribute veth_num_attr;
1445 static struct attribute veth_size_attr;
1446
1447 static ssize_t veth_pool_show(struct kobject *kobj,
1448 struct attribute *attr, char *buf)
1449 {
1450 struct ibmveth_buff_pool *pool = container_of(kobj,
1451 struct ibmveth_buff_pool,
1452 kobj);
1453
1454 if (attr == &veth_active_attr)
1455 return sprintf(buf, "%d\n", pool->active);
1456 else if (attr == &veth_num_attr)
1457 return sprintf(buf, "%d\n", pool->size);
1458 else if (attr == &veth_size_attr)
1459 return sprintf(buf, "%d\n", pool->buff_size);
1460 return 0;
1461 }
1462
1463 static ssize_t veth_pool_store(struct kobject *kobj, struct attribute *attr,
1464 const char *buf, size_t count)
1465 {
1466 struct ibmveth_buff_pool *pool = container_of(kobj,
1467 struct ibmveth_buff_pool,
1468 kobj);
1469 struct net_device *netdev = dev_get_drvdata(
1470 container_of(kobj->parent, struct device, kobj));
1471 struct ibmveth_adapter *adapter = netdev_priv(netdev);
1472 long value = simple_strtol(buf, NULL, 10);
1473 long rc;
1474
1475 if (attr == &veth_active_attr) {
1476 if (value && !pool->active) {
1477 if (netif_running(netdev)) {
1478 if (ibmveth_alloc_buffer_pool(pool)) {
1479 netdev_err(netdev,
1480 "unable to alloc pool\n");
1481 return -ENOMEM;
1482 }
1483 pool->active = 1;
1484 adapter->pool_config = 1;
1485 ibmveth_close(netdev);
1486 adapter->pool_config = 0;
1487 if ((rc = ibmveth_open(netdev)))
1488 return rc;
1489 } else {
1490 pool->active = 1;
1491 }
1492 } else if (!value && pool->active) {
1493 int mtu = netdev->mtu + IBMVETH_BUFF_OH;
1494 int i;
1495 /* Make sure there is a buffer pool with buffers that
1496 can hold a packet of the size of the MTU */
1497 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1498 if (pool == &adapter->rx_buff_pool[i])
1499 continue;
1500 if (!adapter->rx_buff_pool[i].active)
1501 continue;
1502 if (mtu <= adapter->rx_buff_pool[i].buff_size)
1503 break;
1504 }
1505
1506 if (i == IBMVETH_NUM_BUFF_POOLS) {
1507 netdev_err(netdev, "no active pool >= MTU\n");
1508 return -EPERM;
1509 }
1510
1511 if (netif_running(netdev)) {
1512 adapter->pool_config = 1;
1513 ibmveth_close(netdev);
1514 pool->active = 0;
1515 adapter->pool_config = 0;
1516 if ((rc = ibmveth_open(netdev)))
1517 return rc;
1518 }
1519 pool->active = 0;
1520 }
1521 } else if (attr == &veth_num_attr) {
1522 if (value <= 0 || value > IBMVETH_MAX_POOL_COUNT) {
1523 return -EINVAL;
1524 } else {
1525 if (netif_running(netdev)) {
1526 adapter->pool_config = 1;
1527 ibmveth_close(netdev);
1528 adapter->pool_config = 0;
1529 pool->size = value;
1530 if ((rc = ibmveth_open(netdev)))
1531 return rc;
1532 } else {
1533 pool->size = value;
1534 }
1535 }
1536 } else if (attr == &veth_size_attr) {
1537 if (value <= IBMVETH_BUFF_OH || value > IBMVETH_MAX_BUF_SIZE) {
1538 return -EINVAL;
1539 } else {
1540 if (netif_running(netdev)) {
1541 adapter->pool_config = 1;
1542 ibmveth_close(netdev);
1543 adapter->pool_config = 0;
1544 pool->buff_size = value;
1545 if ((rc = ibmveth_open(netdev)))
1546 return rc;
1547 } else {
1548 pool->buff_size = value;
1549 }
1550 }
1551 }
1552
1553 /* kick the interrupt handler to allocate/deallocate pools */
1554 ibmveth_interrupt(netdev->irq, netdev);
1555 return count;
1556 }
1557
1558
1559 #define ATTR(_name, _mode) \
1560 struct attribute veth_##_name##_attr = { \
1561 .name = __stringify(_name), .mode = _mode, \
1562 };
1563
1564 static ATTR(active, 0644);
1565 static ATTR(num, 0644);
1566 static ATTR(size, 0644);
1567
1568 static struct attribute *veth_pool_attrs[] = {
1569 &veth_active_attr,
1570 &veth_num_attr,
1571 &veth_size_attr,
1572 NULL,
1573 };
1574
1575 static const struct sysfs_ops veth_pool_ops = {
1576 .show = veth_pool_show,
1577 .store = veth_pool_store,
1578 };
1579
1580 static struct kobj_type ktype_veth_pool = {
1581 .release = NULL,
1582 .sysfs_ops = &veth_pool_ops,
1583 .default_attrs = veth_pool_attrs,
1584 };
1585
1586 static int ibmveth_resume(struct device *dev)
1587 {
1588 struct net_device *netdev = dev_get_drvdata(dev);
1589 ibmveth_interrupt(netdev->irq, netdev);
1590 return 0;
1591 }
1592
1593 static struct vio_device_id ibmveth_device_table[] __devinitdata = {
1594 { "network", "IBM,l-lan"},
1595 { "", "" }
1596 };
1597 MODULE_DEVICE_TABLE(vio, ibmveth_device_table);
1598
1599 static struct dev_pm_ops ibmveth_pm_ops = {
1600 .resume = ibmveth_resume
1601 };
1602
1603 static struct vio_driver ibmveth_driver = {
1604 .id_table = ibmveth_device_table,
1605 .probe = ibmveth_probe,
1606 .remove = ibmveth_remove,
1607 .get_desired_dma = ibmveth_get_desired_dma,
1608 .driver = {
1609 .name = ibmveth_driver_name,
1610 .owner = THIS_MODULE,
1611 .pm = &ibmveth_pm_ops,
1612 }
1613 };
1614
1615 static 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
1623 static void __exit ibmveth_module_exit(void)
1624 {
1625 vio_unregister_driver(&ibmveth_driver);
1626 }
1627
1628 module_init(ibmveth_module_init);
1629 module_exit(ibmveth_module_exit);
Linux with added FPC-III support