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ethernet: Remove unnecessary alloc/OOM messages, alloc cleanups
[linux-2.6/btrfs-unstable.git] / drivers / net / ethernet / ibm / ibmveth.c
blobc859771a9902e21e2f5e03a7c0901c06788e6172
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 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 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
562 if (!adapter->rx_queue.queue_addr) {
563 netdev_err(netdev, "unable to allocate rx queue pages\n");
564 rc = -ENOMEM;
565 goto err_out;
566 }
567
568 adapter->buffer_list_dma = dma_map_single(dev,
569 adapter->buffer_list_addr, 4096, DMA_BIDIRECTIONAL);
570 adapter->filter_list_dma = dma_map_single(dev,
571 adapter->filter_list_addr, 4096, DMA_BIDIRECTIONAL);
572
573 if ((dma_mapping_error(dev, adapter->buffer_list_dma)) ||
574 (dma_mapping_error(dev, adapter->filter_list_dma))) {
575 netdev_err(netdev, "unable to map filter or buffer list "
576 "pages\n");
577 rc = -ENOMEM;
578 goto err_out;
579 }
580
581 adapter->rx_queue.index = 0;
582 adapter->rx_queue.num_slots = rxq_entries;
583 adapter->rx_queue.toggle = 1;
584
585 memcpy(&mac_address, netdev->dev_addr, netdev->addr_len);
586 mac_address = mac_address >> 16;
587
588 rxq_desc.fields.flags_len = IBMVETH_BUF_VALID |
589 adapter->rx_queue.queue_len;
590 rxq_desc.fields.address = adapter->rx_queue.queue_dma;
591
592 netdev_dbg(netdev, "buffer list @ 0x%p\n", adapter->buffer_list_addr);
593 netdev_dbg(netdev, "filter list @ 0x%p\n", adapter->filter_list_addr);
594 netdev_dbg(netdev, "receive q @ 0x%p\n", adapter->rx_queue.queue_addr);
595
596 h_vio_signal(adapter->vdev->unit_address, VIO_IRQ_DISABLE);
597
598 lpar_rc = ibmveth_register_logical_lan(adapter, rxq_desc, mac_address);
599
600 if (lpar_rc != H_SUCCESS) {
601 netdev_err(netdev, "h_register_logical_lan failed with %ld\n",
602 lpar_rc);
603 netdev_err(netdev, "buffer TCE:0x%llx filter TCE:0x%llx rxq "
604 "desc:0x%llx MAC:0x%llx\n",
605 adapter->buffer_list_dma,
606 adapter->filter_list_dma,
607 rxq_desc.desc,
608 mac_address);
609 rc = -ENONET;
610 goto err_out;
611 }
612
613 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
614 if (!adapter->rx_buff_pool[i].active)
615 continue;
616 if (ibmveth_alloc_buffer_pool(&adapter->rx_buff_pool[i])) {
617 netdev_err(netdev, "unable to alloc pool\n");
618 adapter->rx_buff_pool[i].active = 0;
619 rc = -ENOMEM;
620 goto err_out;
621 }
622 }
623
624 netdev_dbg(netdev, "registering irq 0x%x\n", netdev->irq);
625 rc = request_irq(netdev->irq, ibmveth_interrupt, 0, netdev->name,
626 netdev);
627 if (rc != 0) {
628 netdev_err(netdev, "unable to request irq 0x%x, rc %d\n",
629 netdev->irq, rc);
630 do {
631 lpar_rc = h_free_logical_lan(adapter->vdev->unit_address);
632 } while (H_IS_LONG_BUSY(lpar_rc) || (lpar_rc == H_BUSY));
633
634 goto err_out;
635 }
636
637 adapter->bounce_buffer =
638 kmalloc(netdev->mtu + IBMVETH_BUFF_OH, GFP_KERNEL);
639 if (!adapter->bounce_buffer) {
640 rc = -ENOMEM;
641 goto err_out_free_irq;
642 }
643 adapter->bounce_buffer_dma =
644 dma_map_single(&adapter->vdev->dev, adapter->bounce_buffer,
645 netdev->mtu + IBMVETH_BUFF_OH, DMA_BIDIRECTIONAL);
646 if (dma_mapping_error(dev, adapter->bounce_buffer_dma)) {
647 netdev_err(netdev, "unable to map bounce buffer\n");
648 rc = -ENOMEM;
649 goto err_out_free_irq;
650 }
651
652 netdev_dbg(netdev, "initial replenish cycle\n");
653 ibmveth_interrupt(netdev->irq, netdev);
654
655 netif_start_queue(netdev);
656
657 netdev_dbg(netdev, "open complete\n");
658
659 return 0;
660
661 err_out_free_irq:
662 free_irq(netdev->irq, netdev);
663 err_out:
664 ibmveth_cleanup(adapter);
665 napi_disable(&adapter->napi);
666 return rc;
667 }
668
669 static int ibmveth_close(struct net_device *netdev)
670 {
671 struct ibmveth_adapter *adapter = netdev_priv(netdev);
672 long lpar_rc;
673
674 netdev_dbg(netdev, "close starting\n");
675
676 napi_disable(&adapter->napi);
677
678 if (!adapter->pool_config)
679 netif_stop_queue(netdev);
680
681 h_vio_signal(adapter->vdev->unit_address, VIO_IRQ_DISABLE);
682
683 do {
684 lpar_rc = h_free_logical_lan(adapter->vdev->unit_address);
685 } while (H_IS_LONG_BUSY(lpar_rc) || (lpar_rc == H_BUSY));
686
687 if (lpar_rc != H_SUCCESS) {
688 netdev_err(netdev, "h_free_logical_lan failed with %lx, "
689 "continuing with close\n", lpar_rc);
690 }
691
692 free_irq(netdev->irq, netdev);
693
694 adapter->rx_no_buffer = *(u64 *)(((char *)adapter->buffer_list_addr) +
695 4096 - 8);
696
697 ibmveth_cleanup(adapter);
698
699 netdev_dbg(netdev, "close complete\n");
700
701 return 0;
702 }
703
704 static int netdev_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
705 {
706 cmd->supported = (SUPPORTED_1000baseT_Full | SUPPORTED_Autoneg |
707 SUPPORTED_FIBRE);
708 cmd->advertising = (ADVERTISED_1000baseT_Full | ADVERTISED_Autoneg |
709 ADVERTISED_FIBRE);
710 ethtool_cmd_speed_set(cmd, SPEED_1000);
711 cmd->duplex = DUPLEX_FULL;
712 cmd->port = PORT_FIBRE;
713 cmd->phy_address = 0;
714 cmd->transceiver = XCVR_INTERNAL;
715 cmd->autoneg = AUTONEG_ENABLE;
716 cmd->maxtxpkt = 0;
717 cmd->maxrxpkt = 1;
718 return 0;
719 }
720
721 static void netdev_get_drvinfo(struct net_device *dev,
722 struct ethtool_drvinfo *info)
723 {
724 strlcpy(info->driver, ibmveth_driver_name, sizeof(info->driver));
725 strlcpy(info->version, ibmveth_driver_version, sizeof(info->version));
726 }
727
728 static netdev_features_t ibmveth_fix_features(struct net_device *dev,
729 netdev_features_t features)
730 {
731 /*
732 * Since the ibmveth firmware interface does not have the
733 * concept of separate tx/rx checksum offload enable, if rx
734 * checksum is disabled we also have to disable tx checksum
735 * offload. Once we disable rx checksum offload, we are no
736 * longer allowed to send tx buffers that are not properly
737 * checksummed.
738 */
739
740 if (!(features & NETIF_F_RXCSUM))
741 features &= ~NETIF_F_ALL_CSUM;
742
743 return features;
744 }
745
746 static int ibmveth_set_csum_offload(struct net_device *dev, u32 data)
747 {
748 struct ibmveth_adapter *adapter = netdev_priv(dev);
749 unsigned long set_attr, clr_attr, ret_attr;
750 unsigned long set_attr6, clr_attr6;
751 long ret, ret4, ret6;
752 int rc1 = 0, rc2 = 0;
753 int restart = 0;
754
755 if (netif_running(dev)) {
756 restart = 1;
757 adapter->pool_config = 1;
758 ibmveth_close(dev);
759 adapter->pool_config = 0;
760 }
761
762 set_attr = 0;
763 clr_attr = 0;
764 set_attr6 = 0;
765 clr_attr6 = 0;
766
767 if (data) {
768 set_attr = IBMVETH_ILLAN_IPV4_TCP_CSUM;
769 set_attr6 = IBMVETH_ILLAN_IPV6_TCP_CSUM;
770 } else {
771 clr_attr = IBMVETH_ILLAN_IPV4_TCP_CSUM;
772 clr_attr6 = IBMVETH_ILLAN_IPV6_TCP_CSUM;
773 }
774
775 ret = h_illan_attributes(adapter->vdev->unit_address, 0, 0, &ret_attr);
776
777 if (ret == H_SUCCESS && !(ret_attr & IBMVETH_ILLAN_ACTIVE_TRUNK) &&
778 !(ret_attr & IBMVETH_ILLAN_TRUNK_PRI_MASK) &&
779 (ret_attr & IBMVETH_ILLAN_PADDED_PKT_CSUM)) {
780 ret4 = h_illan_attributes(adapter->vdev->unit_address, clr_attr,
781 set_attr, &ret_attr);
782
783 if (ret4 != H_SUCCESS) {
784 netdev_err(dev, "unable to change IPv4 checksum "
785 "offload settings. %d rc=%ld\n",
786 data, ret4);
787
788 h_illan_attributes(adapter->vdev->unit_address,
789 set_attr, clr_attr, &ret_attr);
790
791 if (data == 1)
792 dev->features &= ~NETIF_F_IP_CSUM;
793
794 } else {
795 adapter->fw_ipv4_csum_support = data;
796 }
797
798 ret6 = h_illan_attributes(adapter->vdev->unit_address,
799 clr_attr6, set_attr6, &ret_attr);
800
801 if (ret6 != H_SUCCESS) {
802 netdev_err(dev, "unable to change IPv6 checksum "
803 "offload settings. %d rc=%ld\n",
804 data, ret6);
805
806 h_illan_attributes(adapter->vdev->unit_address,
807 set_attr6, clr_attr6, &ret_attr);
808
809 if (data == 1)
810 dev->features &= ~NETIF_F_IPV6_CSUM;
811
812 } else
813 adapter->fw_ipv6_csum_support = data;
814
815 if (ret4 == H_SUCCESS || ret6 == H_SUCCESS)
816 adapter->rx_csum = data;
817 else
818 rc1 = -EIO;
819 } else {
820 rc1 = -EIO;
821 netdev_err(dev, "unable to change checksum offload settings."
822 " %d rc=%ld ret_attr=%lx\n", data, ret,
823 ret_attr);
824 }
825
826 if (restart)
827 rc2 = ibmveth_open(dev);
828
829 return rc1 ? rc1 : rc2;
830 }
831
832 static int ibmveth_set_features(struct net_device *dev,
833 netdev_features_t features)
834 {
835 struct ibmveth_adapter *adapter = netdev_priv(dev);
836 int rx_csum = !!(features & NETIF_F_RXCSUM);
837 int rc;
838
839 if (rx_csum == adapter->rx_csum)
840 return 0;
841
842 rc = ibmveth_set_csum_offload(dev, rx_csum);
843 if (rc && !adapter->rx_csum)
844 dev->features = features & ~(NETIF_F_ALL_CSUM | NETIF_F_RXCSUM);
845
846 return rc;
847 }
848
849 static void ibmveth_get_strings(struct net_device *dev, u32 stringset, u8 *data)
850 {
851 int i;
852
853 if (stringset != ETH_SS_STATS)
854 return;
855
856 for (i = 0; i < ARRAY_SIZE(ibmveth_stats); i++, data += ETH_GSTRING_LEN)
857 memcpy(data, ibmveth_stats[i].name, ETH_GSTRING_LEN);
858 }
859
860 static int ibmveth_get_sset_count(struct net_device *dev, int sset)
861 {
862 switch (sset) {
863 case ETH_SS_STATS:
864 return ARRAY_SIZE(ibmveth_stats);
865 default:
866 return -EOPNOTSUPP;
867 }
868 }
869
870 static void ibmveth_get_ethtool_stats(struct net_device *dev,
871 struct ethtool_stats *stats, u64 *data)
872 {
873 int i;
874 struct ibmveth_adapter *adapter = netdev_priv(dev);
875
876 for (i = 0; i < ARRAY_SIZE(ibmveth_stats); i++)
877 data[i] = IBMVETH_GET_STAT(adapter, ibmveth_stats[i].offset);
878 }
879
880 static const struct ethtool_ops netdev_ethtool_ops = {
881 .get_drvinfo = netdev_get_drvinfo,
882 .get_settings = netdev_get_settings,
883 .get_link = ethtool_op_get_link,
884 .get_strings = ibmveth_get_strings,
885 .get_sset_count = ibmveth_get_sset_count,
886 .get_ethtool_stats = ibmveth_get_ethtool_stats,
887 };
888
889 static int ibmveth_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
890 {
891 return -EOPNOTSUPP;
892 }
893
894 #define page_offset(v) ((unsigned long)(v) & ((1 << 12) - 1))
895
896 static int ibmveth_send(struct ibmveth_adapter *adapter,
897 union ibmveth_buf_desc *descs)
898 {
899 unsigned long correlator;
900 unsigned int retry_count;
901 unsigned long ret;
902
903 /*
904 * The retry count sets a maximum for the number of broadcast and
905 * multicast destinations within the system.
906 */
907 retry_count = 1024;
908 correlator = 0;
909 do {
910 ret = h_send_logical_lan(adapter->vdev->unit_address,
911 descs[0].desc, descs[1].desc,
912 descs[2].desc, descs[3].desc,
913 descs[4].desc, descs[5].desc,
914 correlator, &correlator);
915 } while ((ret == H_BUSY) && (retry_count--));
916
917 if (ret != H_SUCCESS && ret != H_DROPPED) {
918 netdev_err(adapter->netdev, "tx: h_send_logical_lan failed "
919 "with rc=%ld\n", ret);
920 return 1;
921 }
922
923 return 0;
924 }
925
926 static netdev_tx_t ibmveth_start_xmit(struct sk_buff *skb,
927 struct net_device *netdev)
928 {
929 struct ibmveth_adapter *adapter = netdev_priv(netdev);
930 unsigned int desc_flags;
931 union ibmveth_buf_desc descs[6];
932 int last, i;
933 int force_bounce = 0;
934 dma_addr_t dma_addr;
935
936 /*
937 * veth handles a maximum of 6 segments including the header, so
938 * we have to linearize the skb if there are more than this.
939 */
940 if (skb_shinfo(skb)->nr_frags > 5 && __skb_linearize(skb)) {
941 netdev->stats.tx_dropped++;
942 goto out;
943 }
944
945 /* veth can't checksum offload UDP */
946 if (skb->ip_summed == CHECKSUM_PARTIAL &&
947 ((skb->protocol == htons(ETH_P_IP) &&
948 ip_hdr(skb)->protocol != IPPROTO_TCP) ||
949 (skb->protocol == htons(ETH_P_IPV6) &&
950 ipv6_hdr(skb)->nexthdr != IPPROTO_TCP)) &&
951 skb_checksum_help(skb)) {
952
953 netdev_err(netdev, "tx: failed to checksum packet\n");
954 netdev->stats.tx_dropped++;
955 goto out;
956 }
957
958 desc_flags = IBMVETH_BUF_VALID;
959
960 if (skb->ip_summed == CHECKSUM_PARTIAL) {
961 unsigned char *buf = skb_transport_header(skb) +
962 skb->csum_offset;
963
964 desc_flags |= (IBMVETH_BUF_NO_CSUM | IBMVETH_BUF_CSUM_GOOD);
965
966 /* Need to zero out the checksum */
967 buf[0] = 0;
968 buf[1] = 0;
969 }
970
971 retry_bounce:
972 memset(descs, 0, sizeof(descs));
973
974 /*
975 * If a linear packet is below the rx threshold then
976 * copy it into the static bounce buffer. This avoids the
977 * cost of a TCE insert and remove.
978 */
979 if (force_bounce || (!skb_is_nonlinear(skb) &&
980 (skb->len < tx_copybreak))) {
981 skb_copy_from_linear_data(skb, adapter->bounce_buffer,
982 skb->len);
983
984 descs[0].fields.flags_len = desc_flags | skb->len;
985 descs[0].fields.address = adapter->bounce_buffer_dma;
986
987 if (ibmveth_send(adapter, descs)) {
988 adapter->tx_send_failed++;
989 netdev->stats.tx_dropped++;
990 } else {
991 netdev->stats.tx_packets++;
992 netdev->stats.tx_bytes += skb->len;
993 }
994
995 goto out;
996 }
997
998 /* Map the header */
999 dma_addr = dma_map_single(&adapter->vdev->dev, skb->data,
1000 skb_headlen(skb), DMA_TO_DEVICE);
1001 if (dma_mapping_error(&adapter->vdev->dev, dma_addr))
1002 goto map_failed;
1003
1004 descs[0].fields.flags_len = desc_flags | skb_headlen(skb);
1005 descs[0].fields.address = dma_addr;
1006
1007 /* Map the frags */
1008 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1009 const skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1010
1011 dma_addr = skb_frag_dma_map(&adapter->vdev->dev, frag, 0,
1012 skb_frag_size(frag), DMA_TO_DEVICE);
1013
1014 if (dma_mapping_error(&adapter->vdev->dev, dma_addr))
1015 goto map_failed_frags;
1016
1017 descs[i+1].fields.flags_len = desc_flags | skb_frag_size(frag);
1018 descs[i+1].fields.address = dma_addr;
1019 }
1020
1021 if (ibmveth_send(adapter, descs)) {
1022 adapter->tx_send_failed++;
1023 netdev->stats.tx_dropped++;
1024 } else {
1025 netdev->stats.tx_packets++;
1026 netdev->stats.tx_bytes += skb->len;
1027 }
1028
1029 dma_unmap_single(&adapter->vdev->dev,
1030 descs[0].fields.address,
1031 descs[0].fields.flags_len & IBMVETH_BUF_LEN_MASK,
1032 DMA_TO_DEVICE);
1033
1034 for (i = 1; i < skb_shinfo(skb)->nr_frags + 1; i++)
1035 dma_unmap_page(&adapter->vdev->dev, descs[i].fields.address,
1036 descs[i].fields.flags_len & IBMVETH_BUF_LEN_MASK,
1037 DMA_TO_DEVICE);
1038
1039 out:
1040 dev_kfree_skb(skb);
1041 return NETDEV_TX_OK;
1042
1043 map_failed_frags:
1044 last = i+1;
1045 for (i = 0; i < last; i++)
1046 dma_unmap_page(&adapter->vdev->dev, descs[i].fields.address,
1047 descs[i].fields.flags_len & IBMVETH_BUF_LEN_MASK,
1048 DMA_TO_DEVICE);
1049
1050 map_failed:
1051 if (!firmware_has_feature(FW_FEATURE_CMO))
1052 netdev_err(netdev, "tx: unable to map xmit buffer\n");
1053 adapter->tx_map_failed++;
1054 skb_linearize(skb);
1055 force_bounce = 1;
1056 goto retry_bounce;
1057 }
1058
1059 static int ibmveth_poll(struct napi_struct *napi, int budget)
1060 {
1061 struct ibmveth_adapter *adapter =
1062 container_of(napi, struct ibmveth_adapter, napi);
1063 struct net_device *netdev = adapter->netdev;
1064 int frames_processed = 0;
1065 unsigned long lpar_rc;
1066
1067 restart_poll:
1068 do {
1069 if (!ibmveth_rxq_pending_buffer(adapter))
1070 break;
1071
1072 smp_rmb();
1073 if (!ibmveth_rxq_buffer_valid(adapter)) {
1074 wmb(); /* suggested by larson1 */
1075 adapter->rx_invalid_buffer++;
1076 netdev_dbg(netdev, "recycling invalid buffer\n");
1077 ibmveth_rxq_recycle_buffer(adapter);
1078 } else {
1079 struct sk_buff *skb, *new_skb;
1080 int length = ibmveth_rxq_frame_length(adapter);
1081 int offset = ibmveth_rxq_frame_offset(adapter);
1082 int csum_good = ibmveth_rxq_csum_good(adapter);
1083
1084 skb = ibmveth_rxq_get_buffer(adapter);
1085
1086 new_skb = NULL;
1087 if (length < rx_copybreak)
1088 new_skb = netdev_alloc_skb(netdev, length);
1089
1090 if (new_skb) {
1091 skb_copy_to_linear_data(new_skb,
1092 skb->data + offset,
1093 length);
1094 if (rx_flush)
1095 ibmveth_flush_buffer(skb->data,
1096 length + offset);
1097 if (!ibmveth_rxq_recycle_buffer(adapter))
1098 kfree_skb(skb);
1099 skb = new_skb;
1100 } else {
1101 ibmveth_rxq_harvest_buffer(adapter);
1102 skb_reserve(skb, offset);
1103 }
1104
1105 skb_put(skb, length);
1106 skb->protocol = eth_type_trans(skb, netdev);
1107
1108 if (csum_good)
1109 skb->ip_summed = CHECKSUM_UNNECESSARY;
1110
1111 netif_receive_skb(skb); /* send it up */
1112
1113 netdev->stats.rx_packets++;
1114 netdev->stats.rx_bytes += length;
1115 frames_processed++;
1116 }
1117 } while (frames_processed < budget);
1118
1119 ibmveth_replenish_task(adapter);
1120
1121 if (frames_processed < budget) {
1122 /* We think we are done - reenable interrupts,
1123 * then check once more to make sure we are done.
1124 */
1125 lpar_rc = h_vio_signal(adapter->vdev->unit_address,
1126 VIO_IRQ_ENABLE);
1127
1128 BUG_ON(lpar_rc != H_SUCCESS);
1129
1130 napi_complete(napi);
1131
1132 if (ibmveth_rxq_pending_buffer(adapter) &&
1133 napi_reschedule(napi)) {
1134 lpar_rc = h_vio_signal(adapter->vdev->unit_address,
1135 VIO_IRQ_DISABLE);
1136 goto restart_poll;
1137 }
1138 }
1139
1140 return frames_processed;
1141 }
1142
1143 static irqreturn_t ibmveth_interrupt(int irq, void *dev_instance)
1144 {
1145 struct net_device *netdev = dev_instance;
1146 struct ibmveth_adapter *adapter = netdev_priv(netdev);
1147 unsigned long lpar_rc;
1148
1149 if (napi_schedule_prep(&adapter->napi)) {
1150 lpar_rc = h_vio_signal(adapter->vdev->unit_address,
1151 VIO_IRQ_DISABLE);
1152 BUG_ON(lpar_rc != H_SUCCESS);
1153 __napi_schedule(&adapter->napi);
1154 }
1155 return IRQ_HANDLED;
1156 }
1157
1158 static void ibmveth_set_multicast_list(struct net_device *netdev)
1159 {
1160 struct ibmveth_adapter *adapter = netdev_priv(netdev);
1161 unsigned long lpar_rc;
1162
1163 if ((netdev->flags & IFF_PROMISC) ||
1164 (netdev_mc_count(netdev) > adapter->mcastFilterSize)) {
1165 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1166 IbmVethMcastEnableRecv |
1167 IbmVethMcastDisableFiltering,
1168 0);
1169 if (lpar_rc != H_SUCCESS) {
1170 netdev_err(netdev, "h_multicast_ctrl rc=%ld when "
1171 "entering promisc mode\n", lpar_rc);
1172 }
1173 } else {
1174 struct netdev_hw_addr *ha;
1175 /* clear the filter table & disable filtering */
1176 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1177 IbmVethMcastEnableRecv |
1178 IbmVethMcastDisableFiltering |
1179 IbmVethMcastClearFilterTable,
1180 0);
1181 if (lpar_rc != H_SUCCESS) {
1182 netdev_err(netdev, "h_multicast_ctrl rc=%ld when "
1183 "attempting to clear filter table\n",
1184 lpar_rc);
1185 }
1186 /* add the addresses to the filter table */
1187 netdev_for_each_mc_addr(ha, netdev) {
1188 /* add the multicast address to the filter table */
1189 unsigned long mcast_addr = 0;
1190 memcpy(((char *)&mcast_addr)+2, ha->addr, 6);
1191 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1192 IbmVethMcastAddFilter,
1193 mcast_addr);
1194 if (lpar_rc != H_SUCCESS) {
1195 netdev_err(netdev, "h_multicast_ctrl rc=%ld "
1196 "when adding an entry to the filter "
1197 "table\n", lpar_rc);
1198 }
1199 }
1200
1201 /* re-enable filtering */
1202 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1203 IbmVethMcastEnableFiltering,
1204 0);
1205 if (lpar_rc != H_SUCCESS) {
1206 netdev_err(netdev, "h_multicast_ctrl rc=%ld when "
1207 "enabling filtering\n", lpar_rc);
1208 }
1209 }
1210 }
1211
1212 static int ibmveth_change_mtu(struct net_device *dev, int new_mtu)
1213 {
1214 struct ibmveth_adapter *adapter = netdev_priv(dev);
1215 struct vio_dev *viodev = adapter->vdev;
1216 int new_mtu_oh = new_mtu + IBMVETH_BUFF_OH;
1217 int i, rc;
1218 int need_restart = 0;
1219
1220 if (new_mtu < IBMVETH_MIN_MTU)
1221 return -EINVAL;
1222
1223 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
1224 if (new_mtu_oh < adapter->rx_buff_pool[i].buff_size)
1225 break;
1226
1227 if (i == IBMVETH_NUM_BUFF_POOLS)
1228 return -EINVAL;
1229
1230 /* Deactivate all the buffer pools so that the next loop can activate
1231 only the buffer pools necessary to hold the new MTU */
1232 if (netif_running(adapter->netdev)) {
1233 need_restart = 1;
1234 adapter->pool_config = 1;
1235 ibmveth_close(adapter->netdev);
1236 adapter->pool_config = 0;
1237 }
1238
1239 /* Look for an active buffer pool that can hold the new MTU */
1240 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1241 adapter->rx_buff_pool[i].active = 1;
1242
1243 if (new_mtu_oh < adapter->rx_buff_pool[i].buff_size) {
1244 dev->mtu = new_mtu;
1245 vio_cmo_set_dev_desired(viodev,
1246 ibmveth_get_desired_dma
1247 (viodev));
1248 if (need_restart) {
1249 return ibmveth_open(adapter->netdev);
1250 }
1251 return 0;
1252 }
1253 }
1254
1255 if (need_restart && (rc = ibmveth_open(adapter->netdev)))
1256 return rc;
1257
1258 return -EINVAL;
1259 }
1260
1261 #ifdef CONFIG_NET_POLL_CONTROLLER
1262 static void ibmveth_poll_controller(struct net_device *dev)
1263 {
1264 ibmveth_replenish_task(netdev_priv(dev));
1265 ibmveth_interrupt(dev->irq, dev);
1266 }
1267 #endif
1268
1269 /**
1270 * ibmveth_get_desired_dma - Calculate IO memory desired by the driver
1271 *
1272 * @vdev: struct vio_dev for the device whose desired IO mem is to be returned
1273 *
1274 * Return value:
1275 * Number of bytes of IO data the driver will need to perform well.
1276 */
1277 static unsigned long ibmveth_get_desired_dma(struct vio_dev *vdev)
1278 {
1279 struct net_device *netdev = dev_get_drvdata(&vdev->dev);
1280 struct ibmveth_adapter *adapter;
1281 unsigned long ret;
1282 int i;
1283 int rxqentries = 1;
1284
1285 /* netdev inits at probe time along with the structures we need below*/
1286 if (netdev == NULL)
1287 return IOMMU_PAGE_ALIGN(IBMVETH_IO_ENTITLEMENT_DEFAULT);
1288
1289 adapter = netdev_priv(netdev);
1290
1291 ret = IBMVETH_BUFF_LIST_SIZE + IBMVETH_FILT_LIST_SIZE;
1292 ret += IOMMU_PAGE_ALIGN(netdev->mtu);
1293
1294 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1295 /* add the size of the active receive buffers */
1296 if (adapter->rx_buff_pool[i].active)
1297 ret +=
1298 adapter->rx_buff_pool[i].size *
1299 IOMMU_PAGE_ALIGN(adapter->rx_buff_pool[i].
1300 buff_size);
1301 rxqentries += adapter->rx_buff_pool[i].size;
1302 }
1303 /* add the size of the receive queue entries */
1304 ret += IOMMU_PAGE_ALIGN(rxqentries * sizeof(struct ibmveth_rx_q_entry));
1305
1306 return ret;
1307 }
1308
1309 static const struct net_device_ops ibmveth_netdev_ops = {
1310 .ndo_open = ibmveth_open,
1311 .ndo_stop = ibmveth_close,
1312 .ndo_start_xmit = ibmveth_start_xmit,
1313 .ndo_set_rx_mode = ibmveth_set_multicast_list,
1314 .ndo_do_ioctl = ibmveth_ioctl,
1315 .ndo_change_mtu = ibmveth_change_mtu,
1316 .ndo_fix_features = ibmveth_fix_features,
1317 .ndo_set_features = ibmveth_set_features,
1318 .ndo_validate_addr = eth_validate_addr,
1319 .ndo_set_mac_address = eth_mac_addr,
1320 #ifdef CONFIG_NET_POLL_CONTROLLER
1321 .ndo_poll_controller = ibmveth_poll_controller,
1322 #endif
1323 };
1324
1325 static int ibmveth_probe(struct vio_dev *dev, 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 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[] = {
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 .name = ibmveth_driver_name,
1609 .pm = &ibmveth_pm_ops,
1610 };
1611
1612 static int __init ibmveth_module_init(void)
1613 {
1614 printk(KERN_DEBUG "%s: %s %s\n", ibmveth_driver_name,
1615 ibmveth_driver_string, ibmveth_driver_version);
1616
1617 return vio_register_driver(&ibmveth_driver);
1618 }
1619
1620 static void __exit ibmveth_module_exit(void)
1621 {
1622 vio_unregister_driver(&ibmveth_driver);
1623 }
1624
1625 module_init(ibmveth_module_init);
1626 module_exit(ibmveth_module_exit);
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