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Merge branch 'for-linus' of git://git.infradead.org/users/sameo/mfd-2.6
[linux-btrfs-devel.git] / drivers / net / ibmveth.c
blob8dd5fccef7252933429d474418fdd712d841dac7
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 if (!dma_mapping_error(dev, adapter->rx_queue.queue_dma)) {
476 dma_unmap_single(dev,
477 adapter->rx_queue.queue_dma,
478 adapter->rx_queue.queue_len,
479 DMA_BIDIRECTIONAL);
480 adapter->rx_queue.queue_dma = DMA_ERROR_CODE;
481 }
482 kfree(adapter->rx_queue.queue_addr);
483 adapter->rx_queue.queue_addr = NULL;
484 }
485
486 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
487 if (adapter->rx_buff_pool[i].active)
488 ibmveth_free_buffer_pool(adapter,
489 &adapter->rx_buff_pool[i]);
490
491 if (adapter->bounce_buffer != NULL) {
492 if (!dma_mapping_error(dev, adapter->bounce_buffer_dma)) {
493 dma_unmap_single(&adapter->vdev->dev,
494 adapter->bounce_buffer_dma,
495 adapter->netdev->mtu + IBMVETH_BUFF_OH,
496 DMA_BIDIRECTIONAL);
497 adapter->bounce_buffer_dma = DMA_ERROR_CODE;
498 }
499 kfree(adapter->bounce_buffer);
500 adapter->bounce_buffer = NULL;
501 }
502 }
503
504 static int ibmveth_register_logical_lan(struct ibmveth_adapter *adapter,
505 union ibmveth_buf_desc rxq_desc, u64 mac_address)
506 {
507 int rc, try_again = 1;
508
509 /*
510 * After a kexec the adapter will still be open, so our attempt to
511 * open it will fail. So if we get a failure we free the adapter and
512 * try again, but only once.
513 */
514 retry:
515 rc = h_register_logical_lan(adapter->vdev->unit_address,
516 adapter->buffer_list_dma, rxq_desc.desc,
517 adapter->filter_list_dma, mac_address);
518
519 if (rc != H_SUCCESS && try_again) {
520 do {
521 rc = h_free_logical_lan(adapter->vdev->unit_address);
522 } while (H_IS_LONG_BUSY(rc) || (rc == H_BUSY));
523
524 try_again = 0;
525 goto retry;
526 }
527
528 return rc;
529 }
530
531 static int ibmveth_open(struct net_device *netdev)
532 {
533 struct ibmveth_adapter *adapter = netdev_priv(netdev);
534 u64 mac_address = 0;
535 int rxq_entries = 1;
536 unsigned long lpar_rc;
537 int rc;
538 union ibmveth_buf_desc rxq_desc;
539 int i;
540 struct device *dev;
541
542 netdev_dbg(netdev, "open starting\n");
543
544 napi_enable(&adapter->napi);
545
546 for(i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
547 rxq_entries += adapter->rx_buff_pool[i].size;
548
549 adapter->buffer_list_addr = (void*) get_zeroed_page(GFP_KERNEL);
550 adapter->filter_list_addr = (void*) get_zeroed_page(GFP_KERNEL);
551
552 if (!adapter->buffer_list_addr || !adapter->filter_list_addr) {
553 netdev_err(netdev, "unable to allocate filter or buffer list "
554 "pages\n");
555 rc = -ENOMEM;
556 goto err_out;
557 }
558
559 adapter->rx_queue.queue_len = sizeof(struct ibmveth_rx_q_entry) *
560 rxq_entries;
561 adapter->rx_queue.queue_addr = kmalloc(adapter->rx_queue.queue_len,
562 GFP_KERNEL);
563
564 if (!adapter->rx_queue.queue_addr) {
565 netdev_err(netdev, "unable to allocate rx queue pages\n");
566 rc = -ENOMEM;
567 goto err_out;
568 }
569
570 dev = &adapter->vdev->dev;
571
572 adapter->buffer_list_dma = dma_map_single(dev,
573 adapter->buffer_list_addr, 4096, DMA_BIDIRECTIONAL);
574 adapter->filter_list_dma = dma_map_single(dev,
575 adapter->filter_list_addr, 4096, DMA_BIDIRECTIONAL);
576 adapter->rx_queue.queue_dma = dma_map_single(dev,
577 adapter->rx_queue.queue_addr,
578 adapter->rx_queue.queue_len, DMA_BIDIRECTIONAL);
579
580 if ((dma_mapping_error(dev, adapter->buffer_list_dma)) ||
581 (dma_mapping_error(dev, adapter->filter_list_dma)) ||
582 (dma_mapping_error(dev, adapter->rx_queue.queue_dma))) {
583 netdev_err(netdev, "unable to map filter or buffer list "
584 "pages\n");
585 rc = -ENOMEM;
586 goto err_out;
587 }
588
589 adapter->rx_queue.index = 0;
590 adapter->rx_queue.num_slots = rxq_entries;
591 adapter->rx_queue.toggle = 1;
592
593 memcpy(&mac_address, netdev->dev_addr, netdev->addr_len);
594 mac_address = mac_address >> 16;
595
596 rxq_desc.fields.flags_len = IBMVETH_BUF_VALID |
597 adapter->rx_queue.queue_len;
598 rxq_desc.fields.address = adapter->rx_queue.queue_dma;
599
600 netdev_dbg(netdev, "buffer list @ 0x%p\n", adapter->buffer_list_addr);
601 netdev_dbg(netdev, "filter list @ 0x%p\n", adapter->filter_list_addr);
602 netdev_dbg(netdev, "receive q @ 0x%p\n", adapter->rx_queue.queue_addr);
603
604 h_vio_signal(adapter->vdev->unit_address, VIO_IRQ_DISABLE);
605
606 lpar_rc = ibmveth_register_logical_lan(adapter, rxq_desc, mac_address);
607
608 if (lpar_rc != H_SUCCESS) {
609 netdev_err(netdev, "h_register_logical_lan failed with %ld\n",
610 lpar_rc);
611 netdev_err(netdev, "buffer TCE:0x%llx filter TCE:0x%llx rxq "
612 "desc:0x%llx MAC:0x%llx\n",
613 adapter->buffer_list_dma,
614 adapter->filter_list_dma,
615 rxq_desc.desc,
616 mac_address);
617 rc = -ENONET;
618 goto err_out;
619 }
620
621 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
622 if (!adapter->rx_buff_pool[i].active)
623 continue;
624 if (ibmveth_alloc_buffer_pool(&adapter->rx_buff_pool[i])) {
625 netdev_err(netdev, "unable to alloc pool\n");
626 adapter->rx_buff_pool[i].active = 0;
627 rc = -ENOMEM;
628 goto err_out;
629 }
630 }
631
632 netdev_dbg(netdev, "registering irq 0x%x\n", netdev->irq);
633 rc = request_irq(netdev->irq, ibmveth_interrupt, 0, netdev->name,
634 netdev);
635 if (rc != 0) {
636 netdev_err(netdev, "unable to request irq 0x%x, rc %d\n",
637 netdev->irq, rc);
638 do {
639 rc = h_free_logical_lan(adapter->vdev->unit_address);
640 } while (H_IS_LONG_BUSY(rc) || (rc == H_BUSY));
641
642 goto err_out;
643 }
644
645 adapter->bounce_buffer =
646 kmalloc(netdev->mtu + IBMVETH_BUFF_OH, GFP_KERNEL);
647 if (!adapter->bounce_buffer) {
648 netdev_err(netdev, "unable to allocate bounce buffer\n");
649 rc = -ENOMEM;
650 goto err_out_free_irq;
651 }
652 adapter->bounce_buffer_dma =
653 dma_map_single(&adapter->vdev->dev, adapter->bounce_buffer,
654 netdev->mtu + IBMVETH_BUFF_OH, DMA_BIDIRECTIONAL);
655 if (dma_mapping_error(dev, adapter->bounce_buffer_dma)) {
656 netdev_err(netdev, "unable to map bounce buffer\n");
657 rc = -ENOMEM;
658 goto err_out_free_irq;
659 }
660
661 netdev_dbg(netdev, "initial replenish cycle\n");
662 ibmveth_interrupt(netdev->irq, netdev);
663
664 netif_start_queue(netdev);
665
666 netdev_dbg(netdev, "open complete\n");
667
668 return 0;
669
670 err_out_free_irq:
671 free_irq(netdev->irq, netdev);
672 err_out:
673 ibmveth_cleanup(adapter);
674 napi_disable(&adapter->napi);
675 return rc;
676 }
677
678 static int ibmveth_close(struct net_device *netdev)
679 {
680 struct ibmveth_adapter *adapter = netdev_priv(netdev);
681 long lpar_rc;
682
683 netdev_dbg(netdev, "close starting\n");
684
685 napi_disable(&adapter->napi);
686
687 if (!adapter->pool_config)
688 netif_stop_queue(netdev);
689
690 h_vio_signal(adapter->vdev->unit_address, VIO_IRQ_DISABLE);
691
692 do {
693 lpar_rc = h_free_logical_lan(adapter->vdev->unit_address);
694 } while (H_IS_LONG_BUSY(lpar_rc) || (lpar_rc == H_BUSY));
695
696 if (lpar_rc != H_SUCCESS) {
697 netdev_err(netdev, "h_free_logical_lan failed with %lx, "
698 "continuing with close\n", lpar_rc);
699 }
700
701 free_irq(netdev->irq, netdev);
702
703 adapter->rx_no_buffer = *(u64 *)(((char *)adapter->buffer_list_addr) +
704 4096 - 8);
705
706 ibmveth_cleanup(adapter);
707
708 netdev_dbg(netdev, "close complete\n");
709
710 return 0;
711 }
712
713 static int netdev_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
714 {
715 cmd->supported = (SUPPORTED_1000baseT_Full | SUPPORTED_Autoneg |
716 SUPPORTED_FIBRE);
717 cmd->advertising = (ADVERTISED_1000baseT_Full | ADVERTISED_Autoneg |
718 ADVERTISED_FIBRE);
719 ethtool_cmd_speed_set(cmd, SPEED_1000);
720 cmd->duplex = DUPLEX_FULL;
721 cmd->port = PORT_FIBRE;
722 cmd->phy_address = 0;
723 cmd->transceiver = XCVR_INTERNAL;
724 cmd->autoneg = AUTONEG_ENABLE;
725 cmd->maxtxpkt = 0;
726 cmd->maxrxpkt = 1;
727 return 0;
728 }
729
730 static void netdev_get_drvinfo(struct net_device *dev,
731 struct ethtool_drvinfo *info)
732 {
733 strncpy(info->driver, ibmveth_driver_name, sizeof(info->driver) - 1);
734 strncpy(info->version, ibmveth_driver_version,
735 sizeof(info->version) - 1);
736 }
737
738 static u32 ibmveth_fix_features(struct net_device *dev, u32 features)
739 {
740 /*
741 * Since the ibmveth firmware interface does not have the
742 * concept of separate tx/rx checksum offload enable, if rx
743 * checksum is disabled we also have to disable tx checksum
744 * offload. Once we disable rx checksum offload, we are no
745 * longer allowed to send tx buffers that are not properly
746 * checksummed.
747 */
748
749 if (!(features & NETIF_F_RXCSUM))
750 features &= ~NETIF_F_ALL_CSUM;
751
752 return features;
753 }
754
755 static int ibmveth_set_csum_offload(struct net_device *dev, u32 data)
756 {
757 struct ibmveth_adapter *adapter = netdev_priv(dev);
758 unsigned long set_attr, clr_attr, ret_attr;
759 unsigned long set_attr6, clr_attr6;
760 long ret, ret4, ret6;
761 int rc1 = 0, rc2 = 0;
762 int restart = 0;
763
764 if (netif_running(dev)) {
765 restart = 1;
766 adapter->pool_config = 1;
767 ibmveth_close(dev);
768 adapter->pool_config = 0;
769 }
770
771 set_attr = 0;
772 clr_attr = 0;
773 set_attr6 = 0;
774 clr_attr6 = 0;
775
776 if (data) {
777 set_attr = IBMVETH_ILLAN_IPV4_TCP_CSUM;
778 set_attr6 = IBMVETH_ILLAN_IPV6_TCP_CSUM;
779 } else {
780 clr_attr = IBMVETH_ILLAN_IPV4_TCP_CSUM;
781 clr_attr6 = IBMVETH_ILLAN_IPV6_TCP_CSUM;
782 }
783
784 ret = h_illan_attributes(adapter->vdev->unit_address, 0, 0, &ret_attr);
785
786 if (ret == H_SUCCESS && !(ret_attr & IBMVETH_ILLAN_ACTIVE_TRUNK) &&
787 !(ret_attr & IBMVETH_ILLAN_TRUNK_PRI_MASK) &&
788 (ret_attr & IBMVETH_ILLAN_PADDED_PKT_CSUM)) {
789 ret4 = h_illan_attributes(adapter->vdev->unit_address, clr_attr,
790 set_attr, &ret_attr);
791
792 if (ret4 != H_SUCCESS) {
793 netdev_err(dev, "unable to change IPv4 checksum "
794 "offload settings. %d rc=%ld\n",
795 data, ret4);
796
797 h_illan_attributes(adapter->vdev->unit_address,
798 set_attr, clr_attr, &ret_attr);
799
800 if (data == 1)
801 dev->features &= ~NETIF_F_IP_CSUM;
802
803 } else {
804 adapter->fw_ipv4_csum_support = data;
805 }
806
807 ret6 = h_illan_attributes(adapter->vdev->unit_address,
808 clr_attr6, set_attr6, &ret_attr);
809
810 if (ret6 != H_SUCCESS) {
811 netdev_err(dev, "unable to change IPv6 checksum "
812 "offload settings. %d rc=%ld\n",
813 data, ret6);
814
815 h_illan_attributes(adapter->vdev->unit_address,
816 set_attr6, clr_attr6, &ret_attr);
817
818 if (data == 1)
819 dev->features &= ~NETIF_F_IPV6_CSUM;
820
821 } else
822 adapter->fw_ipv6_csum_support = data;
823
824 if (ret4 == H_SUCCESS || ret6 == H_SUCCESS)
825 adapter->rx_csum = data;
826 else
827 rc1 = -EIO;
828 } else {
829 rc1 = -EIO;
830 netdev_err(dev, "unable to change checksum offload settings."
831 " %d rc=%ld ret_attr=%lx\n", data, ret,
832 ret_attr);
833 }
834
835 if (restart)
836 rc2 = ibmveth_open(dev);
837
838 return rc1 ? rc1 : rc2;
839 }
840
841 static int ibmveth_set_features(struct net_device *dev, u32 features)
842 {
843 struct ibmveth_adapter *adapter = netdev_priv(dev);
844 int rx_csum = !!(features & NETIF_F_RXCSUM);
845 int rc;
846
847 if (rx_csum == adapter->rx_csum)
848 return 0;
849
850 rc = ibmveth_set_csum_offload(dev, rx_csum);
851 if (rc && !adapter->rx_csum)
852 dev->features = features & ~(NETIF_F_ALL_CSUM | NETIF_F_RXCSUM);
853
854 return rc;
855 }
856
857 static void ibmveth_get_strings(struct net_device *dev, u32 stringset, u8 *data)
858 {
859 int i;
860
861 if (stringset != ETH_SS_STATS)
862 return;
863
864 for (i = 0; i < ARRAY_SIZE(ibmveth_stats); i++, data += ETH_GSTRING_LEN)
865 memcpy(data, ibmveth_stats[i].name, ETH_GSTRING_LEN);
866 }
867
868 static int ibmveth_get_sset_count(struct net_device *dev, int sset)
869 {
870 switch (sset) {
871 case ETH_SS_STATS:
872 return ARRAY_SIZE(ibmveth_stats);
873 default:
874 return -EOPNOTSUPP;
875 }
876 }
877
878 static void ibmveth_get_ethtool_stats(struct net_device *dev,
879 struct ethtool_stats *stats, u64 *data)
880 {
881 int i;
882 struct ibmveth_adapter *adapter = netdev_priv(dev);
883
884 for (i = 0; i < ARRAY_SIZE(ibmveth_stats); i++)
885 data[i] = IBMVETH_GET_STAT(adapter, ibmveth_stats[i].offset);
886 }
887
888 static const struct ethtool_ops netdev_ethtool_ops = {
889 .get_drvinfo = netdev_get_drvinfo,
890 .get_settings = netdev_get_settings,
891 .get_link = ethtool_op_get_link,
892 .get_strings = ibmveth_get_strings,
893 .get_sset_count = ibmveth_get_sset_count,
894 .get_ethtool_stats = ibmveth_get_ethtool_stats,
895 };
896
897 static int ibmveth_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
898 {
899 return -EOPNOTSUPP;
900 }
901
902 #define page_offset(v) ((unsigned long)(v) & ((1 << 12) - 1))
903
904 static int ibmveth_send(struct ibmveth_adapter *adapter,
905 union ibmveth_buf_desc *descs)
906 {
907 unsigned long correlator;
908 unsigned int retry_count;
909 unsigned long ret;
910
911 /*
912 * The retry count sets a maximum for the number of broadcast and
913 * multicast destinations within the system.
914 */
915 retry_count = 1024;
916 correlator = 0;
917 do {
918 ret = h_send_logical_lan(adapter->vdev->unit_address,
919 descs[0].desc, descs[1].desc,
920 descs[2].desc, descs[3].desc,
921 descs[4].desc, descs[5].desc,
922 correlator, &correlator);
923 } while ((ret == H_BUSY) && (retry_count--));
924
925 if (ret != H_SUCCESS && ret != H_DROPPED) {
926 netdev_err(adapter->netdev, "tx: h_send_logical_lan failed "
927 "with rc=%ld\n", ret);
928 return 1;
929 }
930
931 return 0;
932 }
933
934 static netdev_tx_t ibmveth_start_xmit(struct sk_buff *skb,
935 struct net_device *netdev)
936 {
937 struct ibmveth_adapter *adapter = netdev_priv(netdev);
938 unsigned int desc_flags;
939 union ibmveth_buf_desc descs[6];
940 int last, i;
941 int force_bounce = 0;
942 dma_addr_t dma_addr;
943
944 /*
945 * veth handles a maximum of 6 segments including the header, so
946 * we have to linearize the skb if there are more than this.
947 */
948 if (skb_shinfo(skb)->nr_frags > 5 && __skb_linearize(skb)) {
949 netdev->stats.tx_dropped++;
950 goto out;
951 }
952
953 /* veth can't checksum offload UDP */
954 if (skb->ip_summed == CHECKSUM_PARTIAL &&
955 ((skb->protocol == htons(ETH_P_IP) &&
956 ip_hdr(skb)->protocol != IPPROTO_TCP) ||
957 (skb->protocol == htons(ETH_P_IPV6) &&
958 ipv6_hdr(skb)->nexthdr != IPPROTO_TCP)) &&
959 skb_checksum_help(skb)) {
960
961 netdev_err(netdev, "tx: failed to checksum packet\n");
962 netdev->stats.tx_dropped++;
963 goto out;
964 }
965
966 desc_flags = IBMVETH_BUF_VALID;
967
968 if (skb->ip_summed == CHECKSUM_PARTIAL) {
969 unsigned char *buf = skb_transport_header(skb) +
970 skb->csum_offset;
971
972 desc_flags |= (IBMVETH_BUF_NO_CSUM | IBMVETH_BUF_CSUM_GOOD);
973
974 /* Need to zero out the checksum */
975 buf[0] = 0;
976 buf[1] = 0;
977 }
978
979 retry_bounce:
980 memset(descs, 0, sizeof(descs));
981
982 /*
983 * If a linear packet is below the rx threshold then
984 * copy it into the static bounce buffer. This avoids the
985 * cost of a TCE insert and remove.
986 */
987 if (force_bounce || (!skb_is_nonlinear(skb) &&
988 (skb->len < tx_copybreak))) {
989 skb_copy_from_linear_data(skb, adapter->bounce_buffer,
990 skb->len);
991
992 descs[0].fields.flags_len = desc_flags | skb->len;
993 descs[0].fields.address = adapter->bounce_buffer_dma;
994
995 if (ibmveth_send(adapter, descs)) {
996 adapter->tx_send_failed++;
997 netdev->stats.tx_dropped++;
998 } else {
999 netdev->stats.tx_packets++;
1000 netdev->stats.tx_bytes += skb->len;
1001 }
1002
1003 goto out;
1004 }
1005
1006 /* Map the header */
1007 dma_addr = dma_map_single(&adapter->vdev->dev, skb->data,
1008 skb_headlen(skb), DMA_TO_DEVICE);
1009 if (dma_mapping_error(&adapter->vdev->dev, dma_addr))
1010 goto map_failed;
1011
1012 descs[0].fields.flags_len = desc_flags | skb_headlen(skb);
1013 descs[0].fields.address = dma_addr;
1014
1015 /* Map the frags */
1016 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1017 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1018
1019 dma_addr = dma_map_page(&adapter->vdev->dev, frag->page,
1020 frag->page_offset, frag->size,
1021 DMA_TO_DEVICE);
1022
1023 if (dma_mapping_error(&adapter->vdev->dev, dma_addr))
1024 goto map_failed_frags;
1025
1026 descs[i+1].fields.flags_len = desc_flags | frag->size;
1027 descs[i+1].fields.address = dma_addr;
1028 }
1029
1030 if (ibmveth_send(adapter, descs)) {
1031 adapter->tx_send_failed++;
1032 netdev->stats.tx_dropped++;
1033 } else {
1034 netdev->stats.tx_packets++;
1035 netdev->stats.tx_bytes += skb->len;
1036 }
1037
1038 dma_unmap_single(&adapter->vdev->dev,
1039 descs[0].fields.address,
1040 descs[0].fields.flags_len & IBMVETH_BUF_LEN_MASK,
1041 DMA_TO_DEVICE);
1042
1043 for (i = 1; i < skb_shinfo(skb)->nr_frags + 1; i++)
1044 dma_unmap_page(&adapter->vdev->dev, descs[i].fields.address,
1045 descs[i].fields.flags_len & IBMVETH_BUF_LEN_MASK,
1046 DMA_TO_DEVICE);
1047
1048 out:
1049 dev_kfree_skb(skb);
1050 return NETDEV_TX_OK;
1051
1052 map_failed_frags:
1053 last = i+1;
1054 for (i = 0; i < last; i++)
1055 dma_unmap_page(&adapter->vdev->dev, descs[i].fields.address,
1056 descs[i].fields.flags_len & IBMVETH_BUF_LEN_MASK,
1057 DMA_TO_DEVICE);
1058
1059 map_failed:
1060 if (!firmware_has_feature(FW_FEATURE_CMO))
1061 netdev_err(netdev, "tx: unable to map xmit buffer\n");
1062 adapter->tx_map_failed++;
1063 skb_linearize(skb);
1064 force_bounce = 1;
1065 goto retry_bounce;
1066 }
1067
1068 static int ibmveth_poll(struct napi_struct *napi, int budget)
1069 {
1070 struct ibmveth_adapter *adapter =
1071 container_of(napi, struct ibmveth_adapter, napi);
1072 struct net_device *netdev = adapter->netdev;
1073 int frames_processed = 0;
1074 unsigned long lpar_rc;
1075
1076 restart_poll:
1077 do {
1078 if (!ibmveth_rxq_pending_buffer(adapter))
1079 break;
1080
1081 smp_rmb();
1082 if (!ibmveth_rxq_buffer_valid(adapter)) {
1083 wmb(); /* suggested by larson1 */
1084 adapter->rx_invalid_buffer++;
1085 netdev_dbg(netdev, "recycling invalid buffer\n");
1086 ibmveth_rxq_recycle_buffer(adapter);
1087 } else {
1088 struct sk_buff *skb, *new_skb;
1089 int length = ibmveth_rxq_frame_length(adapter);
1090 int offset = ibmveth_rxq_frame_offset(adapter);
1091 int csum_good = ibmveth_rxq_csum_good(adapter);
1092
1093 skb = ibmveth_rxq_get_buffer(adapter);
1094
1095 new_skb = NULL;
1096 if (length < rx_copybreak)
1097 new_skb = netdev_alloc_skb(netdev, length);
1098
1099 if (new_skb) {
1100 skb_copy_to_linear_data(new_skb,
1101 skb->data + offset,
1102 length);
1103 if (rx_flush)
1104 ibmveth_flush_buffer(skb->data,
1105 length + offset);
1106 if (!ibmveth_rxq_recycle_buffer(adapter))
1107 kfree_skb(skb);
1108 skb = new_skb;
1109 } else {
1110 ibmveth_rxq_harvest_buffer(adapter);
1111 skb_reserve(skb, offset);
1112 }
1113
1114 skb_put(skb, length);
1115 skb->protocol = eth_type_trans(skb, netdev);
1116
1117 if (csum_good)
1118 skb->ip_summed = CHECKSUM_UNNECESSARY;
1119
1120 netif_receive_skb(skb); /* send it up */
1121
1122 netdev->stats.rx_packets++;
1123 netdev->stats.rx_bytes += length;
1124 frames_processed++;
1125 }
1126 } while (frames_processed < budget);
1127
1128 ibmveth_replenish_task(adapter);
1129
1130 if (frames_processed < budget) {
1131 /* We think we are done - reenable interrupts,
1132 * then check once more to make sure we are done.
1133 */
1134 lpar_rc = h_vio_signal(adapter->vdev->unit_address,
1135 VIO_IRQ_ENABLE);
1136
1137 BUG_ON(lpar_rc != H_SUCCESS);
1138
1139 napi_complete(napi);
1140
1141 if (ibmveth_rxq_pending_buffer(adapter) &&
1142 napi_reschedule(napi)) {
1143 lpar_rc = h_vio_signal(adapter->vdev->unit_address,
1144 VIO_IRQ_DISABLE);
1145 goto restart_poll;
1146 }
1147 }
1148
1149 return frames_processed;
1150 }
1151
1152 static irqreturn_t ibmveth_interrupt(int irq, void *dev_instance)
1153 {
1154 struct net_device *netdev = dev_instance;
1155 struct ibmveth_adapter *adapter = netdev_priv(netdev);
1156 unsigned long lpar_rc;
1157
1158 if (napi_schedule_prep(&adapter->napi)) {
1159 lpar_rc = h_vio_signal(adapter->vdev->unit_address,
1160 VIO_IRQ_DISABLE);
1161 BUG_ON(lpar_rc != H_SUCCESS);
1162 __napi_schedule(&adapter->napi);
1163 }
1164 return IRQ_HANDLED;
1165 }
1166
1167 static void ibmveth_set_multicast_list(struct net_device *netdev)
1168 {
1169 struct ibmveth_adapter *adapter = netdev_priv(netdev);
1170 unsigned long lpar_rc;
1171
1172 if ((netdev->flags & IFF_PROMISC) ||
1173 (netdev_mc_count(netdev) > adapter->mcastFilterSize)) {
1174 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1175 IbmVethMcastEnableRecv |
1176 IbmVethMcastDisableFiltering,
1177 0);
1178 if (lpar_rc != H_SUCCESS) {
1179 netdev_err(netdev, "h_multicast_ctrl rc=%ld when "
1180 "entering promisc mode\n", lpar_rc);
1181 }
1182 } else {
1183 struct netdev_hw_addr *ha;
1184 /* clear the filter table & disable filtering */
1185 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1186 IbmVethMcastEnableRecv |
1187 IbmVethMcastDisableFiltering |
1188 IbmVethMcastClearFilterTable,
1189 0);
1190 if (lpar_rc != H_SUCCESS) {
1191 netdev_err(netdev, "h_multicast_ctrl rc=%ld when "
1192 "attempting to clear filter table\n",
1193 lpar_rc);
1194 }
1195 /* add the addresses to the filter table */
1196 netdev_for_each_mc_addr(ha, netdev) {
1197 /* add the multicast address to the filter table */
1198 unsigned long mcast_addr = 0;
1199 memcpy(((char *)&mcast_addr)+2, ha->addr, 6);
1200 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1201 IbmVethMcastAddFilter,
1202 mcast_addr);
1203 if (lpar_rc != H_SUCCESS) {
1204 netdev_err(netdev, "h_multicast_ctrl rc=%ld "
1205 "when adding an entry to the filter "
1206 "table\n", lpar_rc);
1207 }
1208 }
1209
1210 /* re-enable filtering */
1211 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1212 IbmVethMcastEnableFiltering,
1213 0);
1214 if (lpar_rc != H_SUCCESS) {
1215 netdev_err(netdev, "h_multicast_ctrl rc=%ld when "
1216 "enabling filtering\n", lpar_rc);
1217 }
1218 }
1219 }
1220
1221 static int ibmveth_change_mtu(struct net_device *dev, int new_mtu)
1222 {
1223 struct ibmveth_adapter *adapter = netdev_priv(dev);
1224 struct vio_dev *viodev = adapter->vdev;
1225 int new_mtu_oh = new_mtu + IBMVETH_BUFF_OH;
1226 int i, rc;
1227 int need_restart = 0;
1228
1229 if (new_mtu < IBMVETH_MIN_MTU)
1230 return -EINVAL;
1231
1232 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
1233 if (new_mtu_oh < adapter->rx_buff_pool[i].buff_size)
1234 break;
1235
1236 if (i == IBMVETH_NUM_BUFF_POOLS)
1237 return -EINVAL;
1238
1239 /* Deactivate all the buffer pools so that the next loop can activate
1240 only the buffer pools necessary to hold the new MTU */
1241 if (netif_running(adapter->netdev)) {
1242 need_restart = 1;
1243 adapter->pool_config = 1;
1244 ibmveth_close(adapter->netdev);
1245 adapter->pool_config = 0;
1246 }
1247
1248 /* Look for an active buffer pool that can hold the new MTU */
1249 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1250 adapter->rx_buff_pool[i].active = 1;
1251
1252 if (new_mtu_oh < adapter->rx_buff_pool[i].buff_size) {
1253 dev->mtu = new_mtu;
1254 vio_cmo_set_dev_desired(viodev,
1255 ibmveth_get_desired_dma
1256 (viodev));
1257 if (need_restart) {
1258 return ibmveth_open(adapter->netdev);
1259 }
1260 return 0;
1261 }
1262 }
1263
1264 if (need_restart && (rc = ibmveth_open(adapter->netdev)))
1265 return rc;
1266
1267 return -EINVAL;
1268 }
1269
1270 #ifdef CONFIG_NET_POLL_CONTROLLER
1271 static void ibmveth_poll_controller(struct net_device *dev)
1272 {
1273 ibmveth_replenish_task(netdev_priv(dev));
1274 ibmveth_interrupt(dev->irq, dev);
1275 }
1276 #endif
1277
1278 /**
1279 * ibmveth_get_desired_dma - Calculate IO memory desired by the driver
1280 *
1281 * @vdev: struct vio_dev for the device whose desired IO mem is to be returned
1282 *
1283 * Return value:
1284 * Number of bytes of IO data the driver will need to perform well.
1285 */
1286 static unsigned long ibmveth_get_desired_dma(struct vio_dev *vdev)
1287 {
1288 struct net_device *netdev = dev_get_drvdata(&vdev->dev);
1289 struct ibmveth_adapter *adapter;
1290 unsigned long ret;
1291 int i;
1292 int rxqentries = 1;
1293
1294 /* netdev inits at probe time along with the structures we need below*/
1295 if (netdev == NULL)
1296 return IOMMU_PAGE_ALIGN(IBMVETH_IO_ENTITLEMENT_DEFAULT);
1297
1298 adapter = netdev_priv(netdev);
1299
1300 ret = IBMVETH_BUFF_LIST_SIZE + IBMVETH_FILT_LIST_SIZE;
1301 ret += IOMMU_PAGE_ALIGN(netdev->mtu);
1302
1303 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1304 /* add the size of the active receive buffers */
1305 if (adapter->rx_buff_pool[i].active)
1306 ret +=
1307 adapter->rx_buff_pool[i].size *
1308 IOMMU_PAGE_ALIGN(adapter->rx_buff_pool[i].
1309 buff_size);
1310 rxqentries += adapter->rx_buff_pool[i].size;
1311 }
1312 /* add the size of the receive queue entries */
1313 ret += IOMMU_PAGE_ALIGN(rxqentries * sizeof(struct ibmveth_rx_q_entry));
1314
1315 return ret;
1316 }
1317
1318 static const struct net_device_ops ibmveth_netdev_ops = {
1319 .ndo_open = ibmveth_open,
1320 .ndo_stop = ibmveth_close,
1321 .ndo_start_xmit = ibmveth_start_xmit,
1322 .ndo_set_multicast_list = ibmveth_set_multicast_list,
1323 .ndo_do_ioctl = ibmveth_ioctl,
1324 .ndo_change_mtu = ibmveth_change_mtu,
1325 .ndo_fix_features = ibmveth_fix_features,
1326 .ndo_set_features = ibmveth_set_features,
1327 .ndo_validate_addr = eth_validate_addr,
1328 .ndo_set_mac_address = eth_mac_addr,
1329 #ifdef CONFIG_NET_POLL_CONTROLLER
1330 .ndo_poll_controller = ibmveth_poll_controller,
1331 #endif
1332 };
1333
1334 static int __devinit ibmveth_probe(struct vio_dev *dev,
1335 const struct vio_device_id *id)
1336 {
1337 int rc, i;
1338 struct net_device *netdev;
1339 struct ibmveth_adapter *adapter;
1340 unsigned char *mac_addr_p;
1341 unsigned int *mcastFilterSize_p;
1342
1343 dev_dbg(&dev->dev, "entering ibmveth_probe for UA 0x%x\n",
1344 dev->unit_address);
1345
1346 mac_addr_p = (unsigned char *)vio_get_attribute(dev, VETH_MAC_ADDR,
1347 NULL);
1348 if (!mac_addr_p) {
1349 dev_err(&dev->dev, "Can't find VETH_MAC_ADDR attribute\n");
1350 return -EINVAL;
1351 }
1352
1353 mcastFilterSize_p = (unsigned int *)vio_get_attribute(dev,
1354 VETH_MCAST_FILTER_SIZE, NULL);
1355 if (!mcastFilterSize_p) {
1356 dev_err(&dev->dev, "Can't find VETH_MCAST_FILTER_SIZE "
1357 "attribute\n");
1358 return -EINVAL;
1359 }
1360
1361 netdev = alloc_etherdev(sizeof(struct ibmveth_adapter));
1362
1363 if (!netdev)
1364 return -ENOMEM;
1365
1366 adapter = netdev_priv(netdev);
1367 dev_set_drvdata(&dev->dev, netdev);
1368
1369 adapter->vdev = dev;
1370 adapter->netdev = netdev;
1371 adapter->mcastFilterSize = *mcastFilterSize_p;
1372 adapter->pool_config = 0;
1373
1374 netif_napi_add(netdev, &adapter->napi, ibmveth_poll, 16);
1375
1376 /*
1377 * Some older boxes running PHYP non-natively have an OF that returns
1378 * a 8-byte local-mac-address field (and the first 2 bytes have to be
1379 * ignored) while newer boxes' OF return a 6-byte field. Note that
1380 * IEEE 1275 specifies that local-mac-address must be a 6-byte field.
1381 * The RPA doc specifies that the first byte must be 10b, so we'll
1382 * just look for it to solve this 8 vs. 6 byte field issue
1383 */
1384 if ((*mac_addr_p & 0x3) != 0x02)
1385 mac_addr_p += 2;
1386
1387 adapter->mac_addr = 0;
1388 memcpy(&adapter->mac_addr, mac_addr_p, 6);
1389
1390 netdev->irq = dev->irq;
1391 netdev->netdev_ops = &ibmveth_netdev_ops;
1392 netdev->ethtool_ops = &netdev_ethtool_ops;
1393 SET_NETDEV_DEV(netdev, &dev->dev);
1394 netdev->hw_features = NETIF_F_SG | NETIF_F_RXCSUM |
1395 NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;
1396 netdev->features |= netdev->hw_features;
1397
1398 memcpy(netdev->dev_addr, &adapter->mac_addr, netdev->addr_len);
1399
1400 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1401 struct kobject *kobj = &adapter->rx_buff_pool[i].kobj;
1402 int error;
1403
1404 ibmveth_init_buffer_pool(&adapter->rx_buff_pool[i], i,
1405 pool_count[i], pool_size[i],
1406 pool_active[i]);
1407 error = kobject_init_and_add(kobj, &ktype_veth_pool,
1408 &dev->dev.kobj, "pool%d", i);
1409 if (!error)
1410 kobject_uevent(kobj, KOBJ_ADD);
1411 }
1412
1413 netdev_dbg(netdev, "adapter @ 0x%p\n", adapter);
1414
1415 adapter->buffer_list_dma = DMA_ERROR_CODE;
1416 adapter->filter_list_dma = DMA_ERROR_CODE;
1417 adapter->rx_queue.queue_dma = DMA_ERROR_CODE;
1418
1419 netdev_dbg(netdev, "registering netdev...\n");
1420
1421 ibmveth_set_features(netdev, netdev->features);
1422
1423 rc = register_netdev(netdev);
1424
1425 if (rc) {
1426 netdev_dbg(netdev, "failed to register netdev rc=%d\n", rc);
1427 free_netdev(netdev);
1428 return rc;
1429 }
1430
1431 netdev_dbg(netdev, "registered\n");
1432
1433 return 0;
1434 }
1435
1436 static int __devexit ibmveth_remove(struct vio_dev *dev)
1437 {
1438 struct net_device *netdev = dev_get_drvdata(&dev->dev);
1439 struct ibmveth_adapter *adapter = netdev_priv(netdev);
1440 int i;
1441
1442 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
1443 kobject_put(&adapter->rx_buff_pool[i].kobj);
1444
1445 unregister_netdev(netdev);
1446
1447 free_netdev(netdev);
1448 dev_set_drvdata(&dev->dev, NULL);
1449
1450 return 0;
1451 }
1452
1453 static struct attribute veth_active_attr;
1454 static struct attribute veth_num_attr;
1455 static struct attribute veth_size_attr;
1456
1457 static ssize_t veth_pool_show(struct kobject *kobj,
1458 struct attribute *attr, char *buf)
1459 {
1460 struct ibmveth_buff_pool *pool = container_of(kobj,
1461 struct ibmveth_buff_pool,
1462 kobj);
1463
1464 if (attr == &veth_active_attr)
1465 return sprintf(buf, "%d\n", pool->active);
1466 else if (attr == &veth_num_attr)
1467 return sprintf(buf, "%d\n", pool->size);
1468 else if (attr == &veth_size_attr)
1469 return sprintf(buf, "%d\n", pool->buff_size);
1470 return 0;
1471 }
1472
1473 static ssize_t veth_pool_store(struct kobject *kobj, struct attribute *attr,
1474 const char *buf, size_t count)
1475 {
1476 struct ibmveth_buff_pool *pool = container_of(kobj,
1477 struct ibmveth_buff_pool,
1478 kobj);
1479 struct net_device *netdev = dev_get_drvdata(
1480 container_of(kobj->parent, struct device, kobj));
1481 struct ibmveth_adapter *adapter = netdev_priv(netdev);
1482 long value = simple_strtol(buf, NULL, 10);
1483 long rc;
1484
1485 if (attr == &veth_active_attr) {
1486 if (value && !pool->active) {
1487 if (netif_running(netdev)) {
1488 if (ibmveth_alloc_buffer_pool(pool)) {
1489 netdev_err(netdev,
1490 "unable to alloc pool\n");
1491 return -ENOMEM;
1492 }
1493 pool->active = 1;
1494 adapter->pool_config = 1;
1495 ibmveth_close(netdev);
1496 adapter->pool_config = 0;
1497 if ((rc = ibmveth_open(netdev)))
1498 return rc;
1499 } else {
1500 pool->active = 1;
1501 }
1502 } else if (!value && pool->active) {
1503 int mtu = netdev->mtu + IBMVETH_BUFF_OH;
1504 int i;
1505 /* Make sure there is a buffer pool with buffers that
1506 can hold a packet of the size of the MTU */
1507 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1508 if (pool == &adapter->rx_buff_pool[i])
1509 continue;
1510 if (!adapter->rx_buff_pool[i].active)
1511 continue;
1512 if (mtu <= adapter->rx_buff_pool[i].buff_size)
1513 break;
1514 }
1515
1516 if (i == IBMVETH_NUM_BUFF_POOLS) {
1517 netdev_err(netdev, "no active pool >= MTU\n");
1518 return -EPERM;
1519 }
1520
1521 if (netif_running(netdev)) {
1522 adapter->pool_config = 1;
1523 ibmveth_close(netdev);
1524 pool->active = 0;
1525 adapter->pool_config = 0;
1526 if ((rc = ibmveth_open(netdev)))
1527 return rc;
1528 }
1529 pool->active = 0;
1530 }
1531 } else if (attr == &veth_num_attr) {
1532 if (value <= 0 || value > IBMVETH_MAX_POOL_COUNT) {
1533 return -EINVAL;
1534 } else {
1535 if (netif_running(netdev)) {
1536 adapter->pool_config = 1;
1537 ibmveth_close(netdev);
1538 adapter->pool_config = 0;
1539 pool->size = value;
1540 if ((rc = ibmveth_open(netdev)))
1541 return rc;
1542 } else {
1543 pool->size = value;
1544 }
1545 }
1546 } else if (attr == &veth_size_attr) {
1547 if (value <= IBMVETH_BUFF_OH || value > IBMVETH_MAX_BUF_SIZE) {
1548 return -EINVAL;
1549 } else {
1550 if (netif_running(netdev)) {
1551 adapter->pool_config = 1;
1552 ibmveth_close(netdev);
1553 adapter->pool_config = 0;
1554 pool->buff_size = value;
1555 if ((rc = ibmveth_open(netdev)))
1556 return rc;
1557 } else {
1558 pool->buff_size = value;
1559 }
1560 }
1561 }
1562
1563 /* kick the interrupt handler to allocate/deallocate pools */
1564 ibmveth_interrupt(netdev->irq, netdev);
1565 return count;
1566 }
1567
1568
1569 #define ATTR(_name, _mode) \
1570 struct attribute veth_##_name##_attr = { \
1571 .name = __stringify(_name), .mode = _mode, \
1572 };
1573
1574 static ATTR(active, 0644);
1575 static ATTR(num, 0644);
1576 static ATTR(size, 0644);
1577
1578 static struct attribute *veth_pool_attrs[] = {
1579 &veth_active_attr,
1580 &veth_num_attr,
1581 &veth_size_attr,
1582 NULL,
1583 };
1584
1585 static const struct sysfs_ops veth_pool_ops = {
1586 .show = veth_pool_show,
1587 .store = veth_pool_store,
1588 };
1589
1590 static struct kobj_type ktype_veth_pool = {
1591 .release = NULL,
1592 .sysfs_ops = &veth_pool_ops,
1593 .default_attrs = veth_pool_attrs,
1594 };
1595
1596 static int ibmveth_resume(struct device *dev)
1597 {
1598 struct net_device *netdev = dev_get_drvdata(dev);
1599 ibmveth_interrupt(netdev->irq, netdev);
1600 return 0;
1601 }
1602
1603 static struct vio_device_id ibmveth_device_table[] __devinitdata = {
1604 { "network", "IBM,l-lan"},
1605 { "", "" }
1606 };
1607 MODULE_DEVICE_TABLE(vio, ibmveth_device_table);
1608
1609 static struct dev_pm_ops ibmveth_pm_ops = {
1610 .resume = ibmveth_resume
1611 };
1612
1613 static struct vio_driver ibmveth_driver = {
1614 .id_table = ibmveth_device_table,
1615 .probe = ibmveth_probe,
1616 .remove = ibmveth_remove,
1617 .get_desired_dma = ibmveth_get_desired_dma,
1618 .driver = {
1619 .name = ibmveth_driver_name,
1620 .owner = THIS_MODULE,
1621 .pm = &ibmveth_pm_ops,
1622 }
1623 };
1624
1625 static int __init ibmveth_module_init(void)
1626 {
1627 printk(KERN_DEBUG "%s: %s %s\n", ibmveth_driver_name,
1628 ibmveth_driver_string, ibmveth_driver_version);
1629
1630 return vio_register_driver(&ibmveth_driver);
1631 }
1632
1633 static void __exit ibmveth_module_exit(void)
1634 {
1635 vio_unregister_driver(&ibmveth_driver);
1636 }
1637
1638 module_init(ibmveth_module_init);
1639 module_exit(ibmveth_module_exit);
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