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MAINTAINERS: Add phy-miphy28lp.c and phy-miphy365x.c to ARCH/STI architecture
[deliverable/linux.git] / drivers / net / ethernet / ibm / ibmveth.c
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, see <http://www.gnu.org/licenses/>.
16 *
17 * Copyright (C) IBM Corporation, 2003, 2010
18 *
19 * Authors: Dave Larson <larson1@us.ibm.com>
20 * Santiago Leon <santil@linux.vnet.ibm.com>
21 * Brian King <brking@linux.vnet.ibm.com>
22 * Robert Jennings <rcj@linux.vnet.ibm.com>
23 * Anton Blanchard <anton@au.ibm.com>
24 */
25
26 #include <linux/module.h>
27 #include <linux/moduleparam.h>
28 #include <linux/types.h>
29 #include <linux/errno.h>
30 #include <linux/dma-mapping.h>
31 #include <linux/kernel.h>
32 #include <linux/netdevice.h>
33 #include <linux/etherdevice.h>
34 #include <linux/skbuff.h>
35 #include <linux/init.h>
36 #include <linux/interrupt.h>
37 #include <linux/mm.h>
38 #include <linux/pm.h>
39 #include <linux/ethtool.h>
40 #include <linux/in.h>
41 #include <linux/ip.h>
42 #include <linux/ipv6.h>
43 #include <linux/slab.h>
44 #include <asm/hvcall.h>
45 #include <linux/atomic.h>
46 #include <asm/vio.h>
47 #include <asm/iommu.h>
48 #include <asm/firmware.h>
49
50 #include "ibmveth.h"
51
52 static irqreturn_t ibmveth_interrupt(int irq, void *dev_instance);
53 static void ibmveth_rxq_harvest_buffer(struct ibmveth_adapter *adapter);
54 static unsigned long ibmveth_get_desired_dma(struct vio_dev *vdev);
55
56 static struct kobj_type ktype_veth_pool;
57
58
59 static const char ibmveth_driver_name[] = "ibmveth";
60 static const char ibmveth_driver_string[] = "IBM Power Virtual Ethernet Driver";
61 #define ibmveth_driver_version "1.04"
62
63 MODULE_AUTHOR("Santiago Leon <santil@linux.vnet.ibm.com>");
64 MODULE_DESCRIPTION("IBM Power Virtual Ethernet Driver");
65 MODULE_LICENSE("GPL");
66 MODULE_VERSION(ibmveth_driver_version);
67
68 static unsigned int tx_copybreak __read_mostly = 128;
69 module_param(tx_copybreak, uint, 0644);
70 MODULE_PARM_DESC(tx_copybreak,
71 "Maximum size of packet that is copied to a new buffer on transmit");
72
73 static unsigned int rx_copybreak __read_mostly = 128;
74 module_param(rx_copybreak, uint, 0644);
75 MODULE_PARM_DESC(rx_copybreak,
76 "Maximum size of packet that is copied to a new buffer on receive");
77
78 static unsigned int rx_flush __read_mostly = 0;
79 module_param(rx_flush, uint, 0644);
80 MODULE_PARM_DESC(rx_flush, "Flush receive buffers before use");
81
82 struct ibmveth_stat {
83 char name[ETH_GSTRING_LEN];
84 int offset;
85 };
86
87 #define IBMVETH_STAT_OFF(stat) offsetof(struct ibmveth_adapter, stat)
88 #define IBMVETH_GET_STAT(a, off) *((u64 *)(((unsigned long)(a)) + off))
89
90 struct ibmveth_stat ibmveth_stats[] = {
91 { "replenish_task_cycles", IBMVETH_STAT_OFF(replenish_task_cycles) },
92 { "replenish_no_mem", IBMVETH_STAT_OFF(replenish_no_mem) },
93 { "replenish_add_buff_failure",
94 IBMVETH_STAT_OFF(replenish_add_buff_failure) },
95 { "replenish_add_buff_success",
96 IBMVETH_STAT_OFF(replenish_add_buff_success) },
97 { "rx_invalid_buffer", IBMVETH_STAT_OFF(rx_invalid_buffer) },
98 { "rx_no_buffer", IBMVETH_STAT_OFF(rx_no_buffer) },
99 { "tx_map_failed", IBMVETH_STAT_OFF(tx_map_failed) },
100 { "tx_send_failed", IBMVETH_STAT_OFF(tx_send_failed) },
101 { "fw_enabled_ipv4_csum", IBMVETH_STAT_OFF(fw_ipv4_csum_support) },
102 { "fw_enabled_ipv6_csum", IBMVETH_STAT_OFF(fw_ipv6_csum_support) },
103 };
104
105 /* simple methods of getting data from the current rxq entry */
106 static inline u32 ibmveth_rxq_flags(struct ibmveth_adapter *adapter)
107 {
108 return be32_to_cpu(adapter->rx_queue.queue_addr[adapter->rx_queue.index].flags_off);
109 }
110
111 static inline int ibmveth_rxq_toggle(struct ibmveth_adapter *adapter)
112 {
113 return (ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_TOGGLE) >>
114 IBMVETH_RXQ_TOGGLE_SHIFT;
115 }
116
117 static inline int ibmveth_rxq_pending_buffer(struct ibmveth_adapter *adapter)
118 {
119 return ibmveth_rxq_toggle(adapter) == adapter->rx_queue.toggle;
120 }
121
122 static inline int ibmveth_rxq_buffer_valid(struct ibmveth_adapter *adapter)
123 {
124 return ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_VALID;
125 }
126
127 static inline int ibmveth_rxq_frame_offset(struct ibmveth_adapter *adapter)
128 {
129 return ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_OFF_MASK;
130 }
131
132 static inline int ibmveth_rxq_frame_length(struct ibmveth_adapter *adapter)
133 {
134 return be32_to_cpu(adapter->rx_queue.queue_addr[adapter->rx_queue.index].length);
135 }
136
137 static inline int ibmveth_rxq_csum_good(struct ibmveth_adapter *adapter)
138 {
139 return ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_CSUM_GOOD;
140 }
141
142 /* setup the initial settings for a buffer pool */
143 static void ibmveth_init_buffer_pool(struct ibmveth_buff_pool *pool,
144 u32 pool_index, u32 pool_size,
145 u32 buff_size, u32 pool_active)
146 {
147 pool->size = pool_size;
148 pool->index = pool_index;
149 pool->buff_size = buff_size;
150 pool->threshold = pool_size * 7 / 8;
151 pool->active = pool_active;
152 }
153
154 /* allocate and setup an buffer pool - called during open */
155 static int ibmveth_alloc_buffer_pool(struct ibmveth_buff_pool *pool)
156 {
157 int i;
158
159 pool->free_map = kmalloc(sizeof(u16) * pool->size, GFP_KERNEL);
160
161 if (!pool->free_map)
162 return -1;
163
164 pool->dma_addr = kmalloc(sizeof(dma_addr_t) * pool->size, GFP_KERNEL);
165 if (!pool->dma_addr) {
166 kfree(pool->free_map);
167 pool->free_map = NULL;
168 return -1;
169 }
170
171 pool->skbuff = kcalloc(pool->size, sizeof(void *), GFP_KERNEL);
172
173 if (!pool->skbuff) {
174 kfree(pool->dma_addr);
175 pool->dma_addr = NULL;
176
177 kfree(pool->free_map);
178 pool->free_map = NULL;
179 return -1;
180 }
181
182 memset(pool->dma_addr, 0, sizeof(dma_addr_t) * pool->size);
183
184 for (i = 0; i < pool->size; ++i)
185 pool->free_map[i] = i;
186
187 atomic_set(&pool->available, 0);
188 pool->producer_index = 0;
189 pool->consumer_index = 0;
190
191 return 0;
192 }
193
194 static inline void ibmveth_flush_buffer(void *addr, unsigned long length)
195 {
196 unsigned long offset;
197
198 for (offset = 0; offset < length; offset += SMP_CACHE_BYTES)
199 asm("dcbfl %0,%1" :: "b" (addr), "r" (offset));
200 }
201
202 /* replenish the buffers for a pool. note that we don't need to
203 * skb_reserve these since they are used for incoming...
204 */
205 static void ibmveth_replenish_buffer_pool(struct ibmveth_adapter *adapter,
206 struct ibmveth_buff_pool *pool)
207 {
208 u32 i;
209 u32 count = pool->size - atomic_read(&pool->available);
210 u32 buffers_added = 0;
211 struct sk_buff *skb;
212 unsigned int free_index, index;
213 u64 correlator;
214 unsigned long lpar_rc;
215 dma_addr_t dma_addr;
216
217 mb();
218
219 for (i = 0; i < count; ++i) {
220 union ibmveth_buf_desc desc;
221
222 skb = netdev_alloc_skb(adapter->netdev, pool->buff_size);
223
224 if (!skb) {
225 netdev_dbg(adapter->netdev,
226 "replenish: unable to allocate skb\n");
227 adapter->replenish_no_mem++;
228 break;
229 }
230
231 free_index = pool->consumer_index;
232 pool->consumer_index++;
233 if (pool->consumer_index >= pool->size)
234 pool->consumer_index = 0;
235 index = pool->free_map[free_index];
236
237 BUG_ON(index == IBM_VETH_INVALID_MAP);
238 BUG_ON(pool->skbuff[index] != NULL);
239
240 dma_addr = dma_map_single(&adapter->vdev->dev, skb->data,
241 pool->buff_size, DMA_FROM_DEVICE);
242
243 if (dma_mapping_error(&adapter->vdev->dev, dma_addr))
244 goto failure;
245
246 pool->free_map[free_index] = IBM_VETH_INVALID_MAP;
247 pool->dma_addr[index] = dma_addr;
248 pool->skbuff[index] = skb;
249
250 correlator = ((u64)pool->index << 32) | index;
251 *(u64 *)skb->data = correlator;
252
253 desc.fields.flags_len = IBMVETH_BUF_VALID | pool->buff_size;
254 desc.fields.address = dma_addr;
255
256 if (rx_flush) {
257 unsigned int len = min(pool->buff_size,
258 adapter->netdev->mtu +
259 IBMVETH_BUFF_OH);
260 ibmveth_flush_buffer(skb->data, len);
261 }
262 lpar_rc = h_add_logical_lan_buffer(adapter->vdev->unit_address,
263 desc.desc);
264
265 if (lpar_rc != H_SUCCESS) {
266 goto failure;
267 } else {
268 buffers_added++;
269 adapter->replenish_add_buff_success++;
270 }
271 }
272
273 mb();
274 atomic_add(buffers_added, &(pool->available));
275 return;
276
277 failure:
278 pool->free_map[free_index] = index;
279 pool->skbuff[index] = NULL;
280 if (pool->consumer_index == 0)
281 pool->consumer_index = pool->size - 1;
282 else
283 pool->consumer_index--;
284 if (!dma_mapping_error(&adapter->vdev->dev, dma_addr))
285 dma_unmap_single(&adapter->vdev->dev,
286 pool->dma_addr[index], pool->buff_size,
287 DMA_FROM_DEVICE);
288 dev_kfree_skb_any(skb);
289 adapter->replenish_add_buff_failure++;
290
291 mb();
292 atomic_add(buffers_added, &(pool->available));
293 }
294
295 /*
296 * The final 8 bytes of the buffer list is a counter of frames dropped
297 * because there was not a buffer in the buffer list capable of holding
298 * the frame.
299 */
300 static void ibmveth_update_rx_no_buffer(struct ibmveth_adapter *adapter)
301 {
302 __be64 *p = adapter->buffer_list_addr + 4096 - 8;
303
304 adapter->rx_no_buffer = be64_to_cpup(p);
305 }
306
307 /* replenish routine */
308 static void ibmveth_replenish_task(struct ibmveth_adapter *adapter)
309 {
310 int i;
311
312 adapter->replenish_task_cycles++;
313
314 for (i = (IBMVETH_NUM_BUFF_POOLS - 1); i >= 0; i--) {
315 struct ibmveth_buff_pool *pool = &adapter->rx_buff_pool[i];
316
317 if (pool->active &&
318 (atomic_read(&pool->available) < pool->threshold))
319 ibmveth_replenish_buffer_pool(adapter, pool);
320 }
321
322 ibmveth_update_rx_no_buffer(adapter);
323 }
324
325 /* empty and free ana buffer pool - also used to do cleanup in error paths */
326 static void ibmveth_free_buffer_pool(struct ibmveth_adapter *adapter,
327 struct ibmveth_buff_pool *pool)
328 {
329 int i;
330
331 kfree(pool->free_map);
332 pool->free_map = NULL;
333
334 if (pool->skbuff && pool->dma_addr) {
335 for (i = 0; i < pool->size; ++i) {
336 struct sk_buff *skb = pool->skbuff[i];
337 if (skb) {
338 dma_unmap_single(&adapter->vdev->dev,
339 pool->dma_addr[i],
340 pool->buff_size,
341 DMA_FROM_DEVICE);
342 dev_kfree_skb_any(skb);
343 pool->skbuff[i] = NULL;
344 }
345 }
346 }
347
348 if (pool->dma_addr) {
349 kfree(pool->dma_addr);
350 pool->dma_addr = NULL;
351 }
352
353 if (pool->skbuff) {
354 kfree(pool->skbuff);
355 pool->skbuff = NULL;
356 }
357 }
358
359 /* remove a buffer from a pool */
360 static void ibmveth_remove_buffer_from_pool(struct ibmveth_adapter *adapter,
361 u64 correlator)
362 {
363 unsigned int pool = correlator >> 32;
364 unsigned int index = correlator & 0xffffffffUL;
365 unsigned int free_index;
366 struct sk_buff *skb;
367
368 BUG_ON(pool >= IBMVETH_NUM_BUFF_POOLS);
369 BUG_ON(index >= adapter->rx_buff_pool[pool].size);
370
371 skb = adapter->rx_buff_pool[pool].skbuff[index];
372
373 BUG_ON(skb == NULL);
374
375 adapter->rx_buff_pool[pool].skbuff[index] = NULL;
376
377 dma_unmap_single(&adapter->vdev->dev,
378 adapter->rx_buff_pool[pool].dma_addr[index],
379 adapter->rx_buff_pool[pool].buff_size,
380 DMA_FROM_DEVICE);
381
382 free_index = adapter->rx_buff_pool[pool].producer_index;
383 adapter->rx_buff_pool[pool].producer_index++;
384 if (adapter->rx_buff_pool[pool].producer_index >=
385 adapter->rx_buff_pool[pool].size)
386 adapter->rx_buff_pool[pool].producer_index = 0;
387 adapter->rx_buff_pool[pool].free_map[free_index] = index;
388
389 mb();
390
391 atomic_dec(&(adapter->rx_buff_pool[pool].available));
392 }
393
394 /* get the current buffer on the rx queue */
395 static inline struct sk_buff *ibmveth_rxq_get_buffer(struct ibmveth_adapter *adapter)
396 {
397 u64 correlator = adapter->rx_queue.queue_addr[adapter->rx_queue.index].correlator;
398 unsigned int pool = correlator >> 32;
399 unsigned int index = correlator & 0xffffffffUL;
400
401 BUG_ON(pool >= IBMVETH_NUM_BUFF_POOLS);
402 BUG_ON(index >= adapter->rx_buff_pool[pool].size);
403
404 return adapter->rx_buff_pool[pool].skbuff[index];
405 }
406
407 /* recycle the current buffer on the rx queue */
408 static int ibmveth_rxq_recycle_buffer(struct ibmveth_adapter *adapter)
409 {
410 u32 q_index = adapter->rx_queue.index;
411 u64 correlator = adapter->rx_queue.queue_addr[q_index].correlator;
412 unsigned int pool = correlator >> 32;
413 unsigned int index = correlator & 0xffffffffUL;
414 union ibmveth_buf_desc desc;
415 unsigned long lpar_rc;
416 int ret = 1;
417
418 BUG_ON(pool >= IBMVETH_NUM_BUFF_POOLS);
419 BUG_ON(index >= adapter->rx_buff_pool[pool].size);
420
421 if (!adapter->rx_buff_pool[pool].active) {
422 ibmveth_rxq_harvest_buffer(adapter);
423 ibmveth_free_buffer_pool(adapter, &adapter->rx_buff_pool[pool]);
424 goto out;
425 }
426
427 desc.fields.flags_len = IBMVETH_BUF_VALID |
428 adapter->rx_buff_pool[pool].buff_size;
429 desc.fields.address = adapter->rx_buff_pool[pool].dma_addr[index];
430
431 lpar_rc = h_add_logical_lan_buffer(adapter->vdev->unit_address, desc.desc);
432
433 if (lpar_rc != H_SUCCESS) {
434 netdev_dbg(adapter->netdev, "h_add_logical_lan_buffer failed "
435 "during recycle rc=%ld", lpar_rc);
436 ibmveth_remove_buffer_from_pool(adapter, adapter->rx_queue.queue_addr[adapter->rx_queue.index].correlator);
437 ret = 0;
438 }
439
440 if (++adapter->rx_queue.index == adapter->rx_queue.num_slots) {
441 adapter->rx_queue.index = 0;
442 adapter->rx_queue.toggle = !adapter->rx_queue.toggle;
443 }
444
445 out:
446 return ret;
447 }
448
449 static void ibmveth_rxq_harvest_buffer(struct ibmveth_adapter *adapter)
450 {
451 ibmveth_remove_buffer_from_pool(adapter, adapter->rx_queue.queue_addr[adapter->rx_queue.index].correlator);
452
453 if (++adapter->rx_queue.index == adapter->rx_queue.num_slots) {
454 adapter->rx_queue.index = 0;
455 adapter->rx_queue.toggle = !adapter->rx_queue.toggle;
456 }
457 }
458
459 static void ibmveth_cleanup(struct ibmveth_adapter *adapter)
460 {
461 int i;
462 struct device *dev = &adapter->vdev->dev;
463
464 if (adapter->buffer_list_addr != NULL) {
465 if (!dma_mapping_error(dev, adapter->buffer_list_dma)) {
466 dma_unmap_single(dev, adapter->buffer_list_dma, 4096,
467 DMA_BIDIRECTIONAL);
468 adapter->buffer_list_dma = DMA_ERROR_CODE;
469 }
470 free_page((unsigned long)adapter->buffer_list_addr);
471 adapter->buffer_list_addr = NULL;
472 }
473
474 if (adapter->filter_list_addr != NULL) {
475 if (!dma_mapping_error(dev, adapter->filter_list_dma)) {
476 dma_unmap_single(dev, adapter->filter_list_dma, 4096,
477 DMA_BIDIRECTIONAL);
478 adapter->filter_list_dma = DMA_ERROR_CODE;
479 }
480 free_page((unsigned long)adapter->filter_list_addr);
481 adapter->filter_list_addr = NULL;
482 }
483
484 if (adapter->rx_queue.queue_addr != NULL) {
485 dma_free_coherent(dev, adapter->rx_queue.queue_len,
486 adapter->rx_queue.queue_addr,
487 adapter->rx_queue.queue_dma);
488 adapter->rx_queue.queue_addr = NULL;
489 }
490
491 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
492 if (adapter->rx_buff_pool[i].active)
493 ibmveth_free_buffer_pool(adapter,
494 &adapter->rx_buff_pool[i]);
495
496 if (adapter->bounce_buffer != NULL) {
497 if (!dma_mapping_error(dev, adapter->bounce_buffer_dma)) {
498 dma_unmap_single(&adapter->vdev->dev,
499 adapter->bounce_buffer_dma,
500 adapter->netdev->mtu + IBMVETH_BUFF_OH,
501 DMA_BIDIRECTIONAL);
502 adapter->bounce_buffer_dma = DMA_ERROR_CODE;
503 }
504 kfree(adapter->bounce_buffer);
505 adapter->bounce_buffer = NULL;
506 }
507 }
508
509 static int ibmveth_register_logical_lan(struct ibmveth_adapter *adapter,
510 union ibmveth_buf_desc rxq_desc, u64 mac_address)
511 {
512 int rc, try_again = 1;
513
514 /*
515 * After a kexec the adapter will still be open, so our attempt to
516 * open it will fail. So if we get a failure we free the adapter and
517 * try again, but only once.
518 */
519 retry:
520 rc = h_register_logical_lan(adapter->vdev->unit_address,
521 adapter->buffer_list_dma, rxq_desc.desc,
522 adapter->filter_list_dma, mac_address);
523
524 if (rc != H_SUCCESS && try_again) {
525 do {
526 rc = h_free_logical_lan(adapter->vdev->unit_address);
527 } while (H_IS_LONG_BUSY(rc) || (rc == H_BUSY));
528
529 try_again = 0;
530 goto retry;
531 }
532
533 return rc;
534 }
535
536 static u64 ibmveth_encode_mac_addr(u8 *mac)
537 {
538 int i;
539 u64 encoded = 0;
540
541 for (i = 0; i < ETH_ALEN; i++)
542 encoded = (encoded << 8) | mac[i];
543
544 return encoded;
545 }
546
547 static int ibmveth_open(struct net_device *netdev)
548 {
549 struct ibmveth_adapter *adapter = netdev_priv(netdev);
550 u64 mac_address;
551 int rxq_entries = 1;
552 unsigned long lpar_rc;
553 int rc;
554 union ibmveth_buf_desc rxq_desc;
555 int i;
556 struct device *dev;
557
558 netdev_dbg(netdev, "open starting\n");
559
560 napi_enable(&adapter->napi);
561
562 for(i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
563 rxq_entries += adapter->rx_buff_pool[i].size;
564
565 adapter->buffer_list_addr = (void*) get_zeroed_page(GFP_KERNEL);
566 adapter->filter_list_addr = (void*) get_zeroed_page(GFP_KERNEL);
567
568 if (!adapter->buffer_list_addr || !adapter->filter_list_addr) {
569 netdev_err(netdev, "unable to allocate filter or buffer list "
570 "pages\n");
571 rc = -ENOMEM;
572 goto err_out;
573 }
574
575 dev = &adapter->vdev->dev;
576
577 adapter->rx_queue.queue_len = sizeof(struct ibmveth_rx_q_entry) *
578 rxq_entries;
579 adapter->rx_queue.queue_addr =
580 dma_alloc_coherent(dev, adapter->rx_queue.queue_len,
581 &adapter->rx_queue.queue_dma, GFP_KERNEL);
582 if (!adapter->rx_queue.queue_addr) {
583 rc = -ENOMEM;
584 goto err_out;
585 }
586
587 adapter->buffer_list_dma = dma_map_single(dev,
588 adapter->buffer_list_addr, 4096, DMA_BIDIRECTIONAL);
589 adapter->filter_list_dma = dma_map_single(dev,
590 adapter->filter_list_addr, 4096, DMA_BIDIRECTIONAL);
591
592 if ((dma_mapping_error(dev, adapter->buffer_list_dma)) ||
593 (dma_mapping_error(dev, adapter->filter_list_dma))) {
594 netdev_err(netdev, "unable to map filter or buffer list "
595 "pages\n");
596 rc = -ENOMEM;
597 goto err_out;
598 }
599
600 adapter->rx_queue.index = 0;
601 adapter->rx_queue.num_slots = rxq_entries;
602 adapter->rx_queue.toggle = 1;
603
604 mac_address = ibmveth_encode_mac_addr(netdev->dev_addr);
605
606 rxq_desc.fields.flags_len = IBMVETH_BUF_VALID |
607 adapter->rx_queue.queue_len;
608 rxq_desc.fields.address = adapter->rx_queue.queue_dma;
609
610 netdev_dbg(netdev, "buffer list @ 0x%p\n", adapter->buffer_list_addr);
611 netdev_dbg(netdev, "filter list @ 0x%p\n", adapter->filter_list_addr);
612 netdev_dbg(netdev, "receive q @ 0x%p\n", adapter->rx_queue.queue_addr);
613
614 h_vio_signal(adapter->vdev->unit_address, VIO_IRQ_DISABLE);
615
616 lpar_rc = ibmveth_register_logical_lan(adapter, rxq_desc, mac_address);
617
618 if (lpar_rc != H_SUCCESS) {
619 netdev_err(netdev, "h_register_logical_lan failed with %ld\n",
620 lpar_rc);
621 netdev_err(netdev, "buffer TCE:0x%llx filter TCE:0x%llx rxq "
622 "desc:0x%llx MAC:0x%llx\n",
623 adapter->buffer_list_dma,
624 adapter->filter_list_dma,
625 rxq_desc.desc,
626 mac_address);
627 rc = -ENONET;
628 goto err_out;
629 }
630
631 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
632 if (!adapter->rx_buff_pool[i].active)
633 continue;
634 if (ibmveth_alloc_buffer_pool(&adapter->rx_buff_pool[i])) {
635 netdev_err(netdev, "unable to alloc pool\n");
636 adapter->rx_buff_pool[i].active = 0;
637 rc = -ENOMEM;
638 goto err_out;
639 }
640 }
641
642 netdev_dbg(netdev, "registering irq 0x%x\n", netdev->irq);
643 rc = request_irq(netdev->irq, ibmveth_interrupt, 0, netdev->name,
644 netdev);
645 if (rc != 0) {
646 netdev_err(netdev, "unable to request irq 0x%x, rc %d\n",
647 netdev->irq, rc);
648 do {
649 lpar_rc = h_free_logical_lan(adapter->vdev->unit_address);
650 } while (H_IS_LONG_BUSY(lpar_rc) || (lpar_rc == H_BUSY));
651
652 goto err_out;
653 }
654
655 adapter->bounce_buffer =
656 kmalloc(netdev->mtu + IBMVETH_BUFF_OH, GFP_KERNEL);
657 if (!adapter->bounce_buffer) {
658 rc = -ENOMEM;
659 goto err_out_free_irq;
660 }
661 adapter->bounce_buffer_dma =
662 dma_map_single(&adapter->vdev->dev, adapter->bounce_buffer,
663 netdev->mtu + IBMVETH_BUFF_OH, DMA_BIDIRECTIONAL);
664 if (dma_mapping_error(dev, adapter->bounce_buffer_dma)) {
665 netdev_err(netdev, "unable to map bounce buffer\n");
666 rc = -ENOMEM;
667 goto err_out_free_irq;
668 }
669
670 netdev_dbg(netdev, "initial replenish cycle\n");
671 ibmveth_interrupt(netdev->irq, netdev);
672
673 netif_start_queue(netdev);
674
675 netdev_dbg(netdev, "open complete\n");
676
677 return 0;
678
679 err_out_free_irq:
680 free_irq(netdev->irq, netdev);
681 err_out:
682 ibmveth_cleanup(adapter);
683 napi_disable(&adapter->napi);
684 return rc;
685 }
686
687 static int ibmveth_close(struct net_device *netdev)
688 {
689 struct ibmveth_adapter *adapter = netdev_priv(netdev);
690 long lpar_rc;
691
692 netdev_dbg(netdev, "close starting\n");
693
694 napi_disable(&adapter->napi);
695
696 if (!adapter->pool_config)
697 netif_stop_queue(netdev);
698
699 h_vio_signal(adapter->vdev->unit_address, VIO_IRQ_DISABLE);
700
701 do {
702 lpar_rc = h_free_logical_lan(adapter->vdev->unit_address);
703 } while (H_IS_LONG_BUSY(lpar_rc) || (lpar_rc == H_BUSY));
704
705 if (lpar_rc != H_SUCCESS) {
706 netdev_err(netdev, "h_free_logical_lan failed with %lx, "
707 "continuing with close\n", lpar_rc);
708 }
709
710 free_irq(netdev->irq, netdev);
711
712 ibmveth_update_rx_no_buffer(adapter);
713
714 ibmveth_cleanup(adapter);
715
716 netdev_dbg(netdev, "close complete\n");
717
718 return 0;
719 }
720
721 static int netdev_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
722 {
723 cmd->supported = (SUPPORTED_1000baseT_Full | SUPPORTED_Autoneg |
724 SUPPORTED_FIBRE);
725 cmd->advertising = (ADVERTISED_1000baseT_Full | ADVERTISED_Autoneg |
726 ADVERTISED_FIBRE);
727 ethtool_cmd_speed_set(cmd, SPEED_1000);
728 cmd->duplex = DUPLEX_FULL;
729 cmd->port = PORT_FIBRE;
730 cmd->phy_address = 0;
731 cmd->transceiver = XCVR_INTERNAL;
732 cmd->autoneg = AUTONEG_ENABLE;
733 cmd->maxtxpkt = 0;
734 cmd->maxrxpkt = 1;
735 return 0;
736 }
737
738 static void netdev_get_drvinfo(struct net_device *dev,
739 struct ethtool_drvinfo *info)
740 {
741 strlcpy(info->driver, ibmveth_driver_name, sizeof(info->driver));
742 strlcpy(info->version, ibmveth_driver_version, sizeof(info->version));
743 }
744
745 static netdev_features_t ibmveth_fix_features(struct net_device *dev,
746 netdev_features_t features)
747 {
748 /*
749 * Since the ibmveth firmware interface does not have the
750 * concept of separate tx/rx checksum offload enable, if rx
751 * checksum is disabled we also have to disable tx checksum
752 * offload. Once we disable rx checksum offload, we are no
753 * longer allowed to send tx buffers that are not properly
754 * checksummed.
755 */
756
757 if (!(features & NETIF_F_RXCSUM))
758 features &= ~NETIF_F_ALL_CSUM;
759
760 return features;
761 }
762
763 static int ibmveth_set_csum_offload(struct net_device *dev, u32 data)
764 {
765 struct ibmveth_adapter *adapter = netdev_priv(dev);
766 unsigned long set_attr, clr_attr, ret_attr;
767 unsigned long set_attr6, clr_attr6;
768 long ret, ret4, ret6;
769 int rc1 = 0, rc2 = 0;
770 int restart = 0;
771
772 if (netif_running(dev)) {
773 restart = 1;
774 adapter->pool_config = 1;
775 ibmveth_close(dev);
776 adapter->pool_config = 0;
777 }
778
779 set_attr = 0;
780 clr_attr = 0;
781 set_attr6 = 0;
782 clr_attr6 = 0;
783
784 if (data) {
785 set_attr = IBMVETH_ILLAN_IPV4_TCP_CSUM;
786 set_attr6 = IBMVETH_ILLAN_IPV6_TCP_CSUM;
787 } else {
788 clr_attr = IBMVETH_ILLAN_IPV4_TCP_CSUM;
789 clr_attr6 = IBMVETH_ILLAN_IPV6_TCP_CSUM;
790 }
791
792 ret = h_illan_attributes(adapter->vdev->unit_address, 0, 0, &ret_attr);
793
794 if (ret == H_SUCCESS && !(ret_attr & IBMVETH_ILLAN_ACTIVE_TRUNK) &&
795 !(ret_attr & IBMVETH_ILLAN_TRUNK_PRI_MASK) &&
796 (ret_attr & IBMVETH_ILLAN_PADDED_PKT_CSUM)) {
797 ret4 = h_illan_attributes(adapter->vdev->unit_address, clr_attr,
798 set_attr, &ret_attr);
799
800 if (ret4 != H_SUCCESS) {
801 netdev_err(dev, "unable to change IPv4 checksum "
802 "offload settings. %d rc=%ld\n",
803 data, ret4);
804
805 h_illan_attributes(adapter->vdev->unit_address,
806 set_attr, clr_attr, &ret_attr);
807
808 if (data == 1)
809 dev->features &= ~NETIF_F_IP_CSUM;
810
811 } else {
812 adapter->fw_ipv4_csum_support = data;
813 }
814
815 ret6 = h_illan_attributes(adapter->vdev->unit_address,
816 clr_attr6, set_attr6, &ret_attr);
817
818 if (ret6 != H_SUCCESS) {
819 netdev_err(dev, "unable to change IPv6 checksum "
820 "offload settings. %d rc=%ld\n",
821 data, ret6);
822
823 h_illan_attributes(adapter->vdev->unit_address,
824 set_attr6, clr_attr6, &ret_attr);
825
826 if (data == 1)
827 dev->features &= ~NETIF_F_IPV6_CSUM;
828
829 } else
830 adapter->fw_ipv6_csum_support = data;
831
832 if (ret4 == H_SUCCESS || ret6 == H_SUCCESS)
833 adapter->rx_csum = data;
834 else
835 rc1 = -EIO;
836 } else {
837 rc1 = -EIO;
838 netdev_err(dev, "unable to change checksum offload settings."
839 " %d rc=%ld ret_attr=%lx\n", data, ret,
840 ret_attr);
841 }
842
843 if (restart)
844 rc2 = ibmveth_open(dev);
845
846 return rc1 ? rc1 : rc2;
847 }
848
849 static int ibmveth_set_features(struct net_device *dev,
850 netdev_features_t features)
851 {
852 struct ibmveth_adapter *adapter = netdev_priv(dev);
853 int rx_csum = !!(features & NETIF_F_RXCSUM);
854 int rc;
855
856 if (rx_csum == adapter->rx_csum)
857 return 0;
858
859 rc = ibmveth_set_csum_offload(dev, rx_csum);
860 if (rc && !adapter->rx_csum)
861 dev->features = features & ~(NETIF_F_ALL_CSUM | NETIF_F_RXCSUM);
862
863 return rc;
864 }
865
866 static void ibmveth_get_strings(struct net_device *dev, u32 stringset, u8 *data)
867 {
868 int i;
869
870 if (stringset != ETH_SS_STATS)
871 return;
872
873 for (i = 0; i < ARRAY_SIZE(ibmveth_stats); i++, data += ETH_GSTRING_LEN)
874 memcpy(data, ibmveth_stats[i].name, ETH_GSTRING_LEN);
875 }
876
877 static int ibmveth_get_sset_count(struct net_device *dev, int sset)
878 {
879 switch (sset) {
880 case ETH_SS_STATS:
881 return ARRAY_SIZE(ibmveth_stats);
882 default:
883 return -EOPNOTSUPP;
884 }
885 }
886
887 static void ibmveth_get_ethtool_stats(struct net_device *dev,
888 struct ethtool_stats *stats, u64 *data)
889 {
890 int i;
891 struct ibmveth_adapter *adapter = netdev_priv(dev);
892
893 for (i = 0; i < ARRAY_SIZE(ibmveth_stats); i++)
894 data[i] = IBMVETH_GET_STAT(adapter, ibmveth_stats[i].offset);
895 }
896
897 static const struct ethtool_ops netdev_ethtool_ops = {
898 .get_drvinfo = netdev_get_drvinfo,
899 .get_settings = netdev_get_settings,
900 .get_link = ethtool_op_get_link,
901 .get_strings = ibmveth_get_strings,
902 .get_sset_count = ibmveth_get_sset_count,
903 .get_ethtool_stats = ibmveth_get_ethtool_stats,
904 };
905
906 static int ibmveth_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
907 {
908 return -EOPNOTSUPP;
909 }
910
911 #define page_offset(v) ((unsigned long)(v) & ((1 << 12) - 1))
912
913 static int ibmveth_send(struct ibmveth_adapter *adapter,
914 union ibmveth_buf_desc *descs)
915 {
916 unsigned long correlator;
917 unsigned int retry_count;
918 unsigned long ret;
919
920 /*
921 * The retry count sets a maximum for the number of broadcast and
922 * multicast destinations within the system.
923 */
924 retry_count = 1024;
925 correlator = 0;
926 do {
927 ret = h_send_logical_lan(adapter->vdev->unit_address,
928 descs[0].desc, descs[1].desc,
929 descs[2].desc, descs[3].desc,
930 descs[4].desc, descs[5].desc,
931 correlator, &correlator);
932 } while ((ret == H_BUSY) && (retry_count--));
933
934 if (ret != H_SUCCESS && ret != H_DROPPED) {
935 netdev_err(adapter->netdev, "tx: h_send_logical_lan failed "
936 "with rc=%ld\n", ret);
937 return 1;
938 }
939
940 return 0;
941 }
942
943 static netdev_tx_t ibmveth_start_xmit(struct sk_buff *skb,
944 struct net_device *netdev)
945 {
946 struct ibmveth_adapter *adapter = netdev_priv(netdev);
947 unsigned int desc_flags;
948 union ibmveth_buf_desc descs[6];
949 int last, i;
950 int force_bounce = 0;
951 dma_addr_t dma_addr;
952
953 /*
954 * veth handles a maximum of 6 segments including the header, so
955 * we have to linearize the skb if there are more than this.
956 */
957 if (skb_shinfo(skb)->nr_frags > 5 && __skb_linearize(skb)) {
958 netdev->stats.tx_dropped++;
959 goto out;
960 }
961
962 /* veth can't checksum offload UDP */
963 if (skb->ip_summed == CHECKSUM_PARTIAL &&
964 ((skb->protocol == htons(ETH_P_IP) &&
965 ip_hdr(skb)->protocol != IPPROTO_TCP) ||
966 (skb->protocol == htons(ETH_P_IPV6) &&
967 ipv6_hdr(skb)->nexthdr != IPPROTO_TCP)) &&
968 skb_checksum_help(skb)) {
969
970 netdev_err(netdev, "tx: failed to checksum packet\n");
971 netdev->stats.tx_dropped++;
972 goto out;
973 }
974
975 desc_flags = IBMVETH_BUF_VALID;
976
977 if (skb->ip_summed == CHECKSUM_PARTIAL) {
978 unsigned char *buf = skb_transport_header(skb) +
979 skb->csum_offset;
980
981 desc_flags |= (IBMVETH_BUF_NO_CSUM | IBMVETH_BUF_CSUM_GOOD);
982
983 /* Need to zero out the checksum */
984 buf[0] = 0;
985 buf[1] = 0;
986 }
987
988 retry_bounce:
989 memset(descs, 0, sizeof(descs));
990
991 /*
992 * If a linear packet is below the rx threshold then
993 * copy it into the static bounce buffer. This avoids the
994 * cost of a TCE insert and remove.
995 */
996 if (force_bounce || (!skb_is_nonlinear(skb) &&
997 (skb->len < tx_copybreak))) {
998 skb_copy_from_linear_data(skb, adapter->bounce_buffer,
999 skb->len);
1000
1001 descs[0].fields.flags_len = desc_flags | skb->len;
1002 descs[0].fields.address = adapter->bounce_buffer_dma;
1003
1004 if (ibmveth_send(adapter, descs)) {
1005 adapter->tx_send_failed++;
1006 netdev->stats.tx_dropped++;
1007 } else {
1008 netdev->stats.tx_packets++;
1009 netdev->stats.tx_bytes += skb->len;
1010 }
1011
1012 goto out;
1013 }
1014
1015 /* Map the header */
1016 dma_addr = dma_map_single(&adapter->vdev->dev, skb->data,
1017 skb_headlen(skb), DMA_TO_DEVICE);
1018 if (dma_mapping_error(&adapter->vdev->dev, dma_addr))
1019 goto map_failed;
1020
1021 descs[0].fields.flags_len = desc_flags | skb_headlen(skb);
1022 descs[0].fields.address = dma_addr;
1023
1024 /* Map the frags */
1025 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1026 const skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1027
1028 dma_addr = skb_frag_dma_map(&adapter->vdev->dev, frag, 0,
1029 skb_frag_size(frag), DMA_TO_DEVICE);
1030
1031 if (dma_mapping_error(&adapter->vdev->dev, dma_addr))
1032 goto map_failed_frags;
1033
1034 descs[i+1].fields.flags_len = desc_flags | skb_frag_size(frag);
1035 descs[i+1].fields.address = dma_addr;
1036 }
1037
1038 if (ibmveth_send(adapter, descs)) {
1039 adapter->tx_send_failed++;
1040 netdev->stats.tx_dropped++;
1041 } else {
1042 netdev->stats.tx_packets++;
1043 netdev->stats.tx_bytes += skb->len;
1044 }
1045
1046 dma_unmap_single(&adapter->vdev->dev,
1047 descs[0].fields.address,
1048 descs[0].fields.flags_len & IBMVETH_BUF_LEN_MASK,
1049 DMA_TO_DEVICE);
1050
1051 for (i = 1; i < skb_shinfo(skb)->nr_frags + 1; i++)
1052 dma_unmap_page(&adapter->vdev->dev, descs[i].fields.address,
1053 descs[i].fields.flags_len & IBMVETH_BUF_LEN_MASK,
1054 DMA_TO_DEVICE);
1055
1056 out:
1057 dev_consume_skb_any(skb);
1058 return NETDEV_TX_OK;
1059
1060 map_failed_frags:
1061 last = i+1;
1062 for (i = 0; i < last; i++)
1063 dma_unmap_page(&adapter->vdev->dev, descs[i].fields.address,
1064 descs[i].fields.flags_len & IBMVETH_BUF_LEN_MASK,
1065 DMA_TO_DEVICE);
1066
1067 map_failed:
1068 if (!firmware_has_feature(FW_FEATURE_CMO))
1069 netdev_err(netdev, "tx: unable to map xmit buffer\n");
1070 adapter->tx_map_failed++;
1071 skb_linearize(skb);
1072 force_bounce = 1;
1073 goto retry_bounce;
1074 }
1075
1076 static int ibmveth_poll(struct napi_struct *napi, int budget)
1077 {
1078 struct ibmveth_adapter *adapter =
1079 container_of(napi, struct ibmveth_adapter, napi);
1080 struct net_device *netdev = adapter->netdev;
1081 int frames_processed = 0;
1082 unsigned long lpar_rc;
1083
1084 restart_poll:
1085 while (frames_processed < budget) {
1086 if (!ibmveth_rxq_pending_buffer(adapter))
1087 break;
1088
1089 smp_rmb();
1090 if (!ibmveth_rxq_buffer_valid(adapter)) {
1091 wmb(); /* suggested by larson1 */
1092 adapter->rx_invalid_buffer++;
1093 netdev_dbg(netdev, "recycling invalid buffer\n");
1094 ibmveth_rxq_recycle_buffer(adapter);
1095 } else {
1096 struct sk_buff *skb, *new_skb;
1097 int length = ibmveth_rxq_frame_length(adapter);
1098 int offset = ibmveth_rxq_frame_offset(adapter);
1099 int csum_good = ibmveth_rxq_csum_good(adapter);
1100
1101 skb = ibmveth_rxq_get_buffer(adapter);
1102
1103 new_skb = NULL;
1104 if (length < rx_copybreak)
1105 new_skb = netdev_alloc_skb(netdev, length);
1106
1107 if (new_skb) {
1108 skb_copy_to_linear_data(new_skb,
1109 skb->data + offset,
1110 length);
1111 if (rx_flush)
1112 ibmveth_flush_buffer(skb->data,
1113 length + offset);
1114 if (!ibmveth_rxq_recycle_buffer(adapter))
1115 kfree_skb(skb);
1116 skb = new_skb;
1117 } else {
1118 ibmveth_rxq_harvest_buffer(adapter);
1119 skb_reserve(skb, offset);
1120 }
1121
1122 skb_put(skb, length);
1123 skb->protocol = eth_type_trans(skb, netdev);
1124
1125 if (csum_good)
1126 skb->ip_summed = CHECKSUM_UNNECESSARY;
1127
1128 netif_receive_skb(skb); /* send it up */
1129
1130 netdev->stats.rx_packets++;
1131 netdev->stats.rx_bytes += length;
1132 frames_processed++;
1133 }
1134 }
1135
1136 ibmveth_replenish_task(adapter);
1137
1138 if (frames_processed < budget) {
1139 /* We think we are done - reenable interrupts,
1140 * then check once more to make sure we are done.
1141 */
1142 lpar_rc = h_vio_signal(adapter->vdev->unit_address,
1143 VIO_IRQ_ENABLE);
1144
1145 BUG_ON(lpar_rc != H_SUCCESS);
1146
1147 napi_complete(napi);
1148
1149 if (ibmveth_rxq_pending_buffer(adapter) &&
1150 napi_reschedule(napi)) {
1151 lpar_rc = h_vio_signal(adapter->vdev->unit_address,
1152 VIO_IRQ_DISABLE);
1153 goto restart_poll;
1154 }
1155 }
1156
1157 return frames_processed;
1158 }
1159
1160 static irqreturn_t ibmveth_interrupt(int irq, void *dev_instance)
1161 {
1162 struct net_device *netdev = dev_instance;
1163 struct ibmveth_adapter *adapter = netdev_priv(netdev);
1164 unsigned long lpar_rc;
1165
1166 if (napi_schedule_prep(&adapter->napi)) {
1167 lpar_rc = h_vio_signal(adapter->vdev->unit_address,
1168 VIO_IRQ_DISABLE);
1169 BUG_ON(lpar_rc != H_SUCCESS);
1170 __napi_schedule(&adapter->napi);
1171 }
1172 return IRQ_HANDLED;
1173 }
1174
1175 static void ibmveth_set_multicast_list(struct net_device *netdev)
1176 {
1177 struct ibmveth_adapter *adapter = netdev_priv(netdev);
1178 unsigned long lpar_rc;
1179
1180 if ((netdev->flags & IFF_PROMISC) ||
1181 (netdev_mc_count(netdev) > adapter->mcastFilterSize)) {
1182 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1183 IbmVethMcastEnableRecv |
1184 IbmVethMcastDisableFiltering,
1185 0);
1186 if (lpar_rc != H_SUCCESS) {
1187 netdev_err(netdev, "h_multicast_ctrl rc=%ld when "
1188 "entering promisc mode\n", lpar_rc);
1189 }
1190 } else {
1191 struct netdev_hw_addr *ha;
1192 /* clear the filter table & disable filtering */
1193 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1194 IbmVethMcastEnableRecv |
1195 IbmVethMcastDisableFiltering |
1196 IbmVethMcastClearFilterTable,
1197 0);
1198 if (lpar_rc != H_SUCCESS) {
1199 netdev_err(netdev, "h_multicast_ctrl rc=%ld when "
1200 "attempting to clear filter table\n",
1201 lpar_rc);
1202 }
1203 /* add the addresses to the filter table */
1204 netdev_for_each_mc_addr(ha, netdev) {
1205 /* add the multicast address to the filter table */
1206 u64 mcast_addr;
1207 mcast_addr = ibmveth_encode_mac_addr(ha->addr);
1208 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1209 IbmVethMcastAddFilter,
1210 mcast_addr);
1211 if (lpar_rc != H_SUCCESS) {
1212 netdev_err(netdev, "h_multicast_ctrl rc=%ld "
1213 "when adding an entry to the filter "
1214 "table\n", lpar_rc);
1215 }
1216 }
1217
1218 /* re-enable filtering */
1219 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1220 IbmVethMcastEnableFiltering,
1221 0);
1222 if (lpar_rc != H_SUCCESS) {
1223 netdev_err(netdev, "h_multicast_ctrl rc=%ld when "
1224 "enabling filtering\n", lpar_rc);
1225 }
1226 }
1227 }
1228
1229 static int ibmveth_change_mtu(struct net_device *dev, int new_mtu)
1230 {
1231 struct ibmveth_adapter *adapter = netdev_priv(dev);
1232 struct vio_dev *viodev = adapter->vdev;
1233 int new_mtu_oh = new_mtu + IBMVETH_BUFF_OH;
1234 int i, rc;
1235 int need_restart = 0;
1236
1237 if (new_mtu < IBMVETH_MIN_MTU)
1238 return -EINVAL;
1239
1240 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
1241 if (new_mtu_oh < adapter->rx_buff_pool[i].buff_size)
1242 break;
1243
1244 if (i == IBMVETH_NUM_BUFF_POOLS)
1245 return -EINVAL;
1246
1247 /* Deactivate all the buffer pools so that the next loop can activate
1248 only the buffer pools necessary to hold the new MTU */
1249 if (netif_running(adapter->netdev)) {
1250 need_restart = 1;
1251 adapter->pool_config = 1;
1252 ibmveth_close(adapter->netdev);
1253 adapter->pool_config = 0;
1254 }
1255
1256 /* Look for an active buffer pool that can hold the new MTU */
1257 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1258 adapter->rx_buff_pool[i].active = 1;
1259
1260 if (new_mtu_oh < adapter->rx_buff_pool[i].buff_size) {
1261 dev->mtu = new_mtu;
1262 vio_cmo_set_dev_desired(viodev,
1263 ibmveth_get_desired_dma
1264 (viodev));
1265 if (need_restart) {
1266 return ibmveth_open(adapter->netdev);
1267 }
1268 return 0;
1269 }
1270 }
1271
1272 if (need_restart && (rc = ibmveth_open(adapter->netdev)))
1273 return rc;
1274
1275 return -EINVAL;
1276 }
1277
1278 #ifdef CONFIG_NET_POLL_CONTROLLER
1279 static void ibmveth_poll_controller(struct net_device *dev)
1280 {
1281 ibmveth_replenish_task(netdev_priv(dev));
1282 ibmveth_interrupt(dev->irq, dev);
1283 }
1284 #endif
1285
1286 /**
1287 * ibmveth_get_desired_dma - Calculate IO memory desired by the driver
1288 *
1289 * @vdev: struct vio_dev for the device whose desired IO mem is to be returned
1290 *
1291 * Return value:
1292 * Number of bytes of IO data the driver will need to perform well.
1293 */
1294 static unsigned long ibmveth_get_desired_dma(struct vio_dev *vdev)
1295 {
1296 struct net_device *netdev = dev_get_drvdata(&vdev->dev);
1297 struct ibmveth_adapter *adapter;
1298 struct iommu_table *tbl;
1299 unsigned long ret;
1300 int i;
1301 int rxqentries = 1;
1302
1303 tbl = get_iommu_table_base(&vdev->dev);
1304
1305 /* netdev inits at probe time along with the structures we need below*/
1306 if (netdev == NULL)
1307 return IOMMU_PAGE_ALIGN(IBMVETH_IO_ENTITLEMENT_DEFAULT, tbl);
1308
1309 adapter = netdev_priv(netdev);
1310
1311 ret = IBMVETH_BUFF_LIST_SIZE + IBMVETH_FILT_LIST_SIZE;
1312 ret += IOMMU_PAGE_ALIGN(netdev->mtu, tbl);
1313
1314 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1315 /* add the size of the active receive buffers */
1316 if (adapter->rx_buff_pool[i].active)
1317 ret +=
1318 adapter->rx_buff_pool[i].size *
1319 IOMMU_PAGE_ALIGN(adapter->rx_buff_pool[i].
1320 buff_size, tbl);
1321 rxqentries += adapter->rx_buff_pool[i].size;
1322 }
1323 /* add the size of the receive queue entries */
1324 ret += IOMMU_PAGE_ALIGN(
1325 rxqentries * sizeof(struct ibmveth_rx_q_entry), tbl);
1326
1327 return ret;
1328 }
1329
1330 static const struct net_device_ops ibmveth_netdev_ops = {
1331 .ndo_open = ibmveth_open,
1332 .ndo_stop = ibmveth_close,
1333 .ndo_start_xmit = ibmveth_start_xmit,
1334 .ndo_set_rx_mode = ibmveth_set_multicast_list,
1335 .ndo_do_ioctl = ibmveth_ioctl,
1336 .ndo_change_mtu = ibmveth_change_mtu,
1337 .ndo_fix_features = ibmveth_fix_features,
1338 .ndo_set_features = ibmveth_set_features,
1339 .ndo_validate_addr = eth_validate_addr,
1340 .ndo_set_mac_address = eth_mac_addr,
1341 #ifdef CONFIG_NET_POLL_CONTROLLER
1342 .ndo_poll_controller = ibmveth_poll_controller,
1343 #endif
1344 };
1345
1346 static int ibmveth_probe(struct vio_dev *dev, const struct vio_device_id *id)
1347 {
1348 int rc, i, mac_len;
1349 struct net_device *netdev;
1350 struct ibmveth_adapter *adapter;
1351 unsigned char *mac_addr_p;
1352 unsigned int *mcastFilterSize_p;
1353
1354 dev_dbg(&dev->dev, "entering ibmveth_probe for UA 0x%x\n",
1355 dev->unit_address);
1356
1357 mac_addr_p = (unsigned char *)vio_get_attribute(dev, VETH_MAC_ADDR,
1358 &mac_len);
1359 if (!mac_addr_p) {
1360 dev_err(&dev->dev, "Can't find VETH_MAC_ADDR attribute\n");
1361 return -EINVAL;
1362 }
1363 /* Workaround for old/broken pHyp */
1364 if (mac_len == 8)
1365 mac_addr_p += 2;
1366 else if (mac_len != 6) {
1367 dev_err(&dev->dev, "VETH_MAC_ADDR attribute wrong len %d\n",
1368 mac_len);
1369 return -EINVAL;
1370 }
1371
1372 mcastFilterSize_p = (unsigned int *)vio_get_attribute(dev,
1373 VETH_MCAST_FILTER_SIZE, NULL);
1374 if (!mcastFilterSize_p) {
1375 dev_err(&dev->dev, "Can't find VETH_MCAST_FILTER_SIZE "
1376 "attribute\n");
1377 return -EINVAL;
1378 }
1379
1380 netdev = alloc_etherdev(sizeof(struct ibmveth_adapter));
1381
1382 if (!netdev)
1383 return -ENOMEM;
1384
1385 adapter = netdev_priv(netdev);
1386 dev_set_drvdata(&dev->dev, netdev);
1387
1388 adapter->vdev = dev;
1389 adapter->netdev = netdev;
1390 adapter->mcastFilterSize = *mcastFilterSize_p;
1391 adapter->pool_config = 0;
1392
1393 netif_napi_add(netdev, &adapter->napi, ibmveth_poll, 16);
1394
1395 netdev->irq = dev->irq;
1396 netdev->netdev_ops = &ibmveth_netdev_ops;
1397 netdev->ethtool_ops = &netdev_ethtool_ops;
1398 SET_NETDEV_DEV(netdev, &dev->dev);
1399 netdev->hw_features = NETIF_F_SG | NETIF_F_RXCSUM |
1400 NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;
1401 netdev->features |= netdev->hw_features;
1402
1403 memcpy(netdev->dev_addr, mac_addr_p, ETH_ALEN);
1404
1405 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1406 struct kobject *kobj = &adapter->rx_buff_pool[i].kobj;
1407 int error;
1408
1409 ibmveth_init_buffer_pool(&adapter->rx_buff_pool[i], i,
1410 pool_count[i], pool_size[i],
1411 pool_active[i]);
1412 error = kobject_init_and_add(kobj, &ktype_veth_pool,
1413 &dev->dev.kobj, "pool%d", i);
1414 if (!error)
1415 kobject_uevent(kobj, KOBJ_ADD);
1416 }
1417
1418 netdev_dbg(netdev, "adapter @ 0x%p\n", adapter);
1419
1420 adapter->buffer_list_dma = DMA_ERROR_CODE;
1421 adapter->filter_list_dma = DMA_ERROR_CODE;
1422 adapter->rx_queue.queue_dma = DMA_ERROR_CODE;
1423
1424 netdev_dbg(netdev, "registering netdev...\n");
1425
1426 ibmveth_set_features(netdev, netdev->features);
1427
1428 rc = register_netdev(netdev);
1429
1430 if (rc) {
1431 netdev_dbg(netdev, "failed to register netdev rc=%d\n", rc);
1432 free_netdev(netdev);
1433 return rc;
1434 }
1435
1436 netdev_dbg(netdev, "registered\n");
1437
1438 return 0;
1439 }
1440
1441 static int ibmveth_remove(struct vio_dev *dev)
1442 {
1443 struct net_device *netdev = dev_get_drvdata(&dev->dev);
1444 struct ibmveth_adapter *adapter = netdev_priv(netdev);
1445 int i;
1446
1447 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
1448 kobject_put(&adapter->rx_buff_pool[i].kobj);
1449
1450 unregister_netdev(netdev);
1451
1452 free_netdev(netdev);
1453 dev_set_drvdata(&dev->dev, NULL);
1454
1455 return 0;
1456 }
1457
1458 static struct attribute veth_active_attr;
1459 static struct attribute veth_num_attr;
1460 static struct attribute veth_size_attr;
1461
1462 static ssize_t veth_pool_show(struct kobject *kobj,
1463 struct attribute *attr, char *buf)
1464 {
1465 struct ibmveth_buff_pool *pool = container_of(kobj,
1466 struct ibmveth_buff_pool,
1467 kobj);
1468
1469 if (attr == &veth_active_attr)
1470 return sprintf(buf, "%d\n", pool->active);
1471 else if (attr == &veth_num_attr)
1472 return sprintf(buf, "%d\n", pool->size);
1473 else if (attr == &veth_size_attr)
1474 return sprintf(buf, "%d\n", pool->buff_size);
1475 return 0;
1476 }
1477
1478 static ssize_t veth_pool_store(struct kobject *kobj, struct attribute *attr,
1479 const char *buf, size_t count)
1480 {
1481 struct ibmveth_buff_pool *pool = container_of(kobj,
1482 struct ibmveth_buff_pool,
1483 kobj);
1484 struct net_device *netdev = dev_get_drvdata(
1485 container_of(kobj->parent, struct device, kobj));
1486 struct ibmveth_adapter *adapter = netdev_priv(netdev);
1487 long value = simple_strtol(buf, NULL, 10);
1488 long rc;
1489
1490 if (attr == &veth_active_attr) {
1491 if (value && !pool->active) {
1492 if (netif_running(netdev)) {
1493 if (ibmveth_alloc_buffer_pool(pool)) {
1494 netdev_err(netdev,
1495 "unable to alloc pool\n");
1496 return -ENOMEM;
1497 }
1498 pool->active = 1;
1499 adapter->pool_config = 1;
1500 ibmveth_close(netdev);
1501 adapter->pool_config = 0;
1502 if ((rc = ibmveth_open(netdev)))
1503 return rc;
1504 } else {
1505 pool->active = 1;
1506 }
1507 } else if (!value && pool->active) {
1508 int mtu = netdev->mtu + IBMVETH_BUFF_OH;
1509 int i;
1510 /* Make sure there is a buffer pool with buffers that
1511 can hold a packet of the size of the MTU */
1512 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1513 if (pool == &adapter->rx_buff_pool[i])
1514 continue;
1515 if (!adapter->rx_buff_pool[i].active)
1516 continue;
1517 if (mtu <= adapter->rx_buff_pool[i].buff_size)
1518 break;
1519 }
1520
1521 if (i == IBMVETH_NUM_BUFF_POOLS) {
1522 netdev_err(netdev, "no active pool >= MTU\n");
1523 return -EPERM;
1524 }
1525
1526 if (netif_running(netdev)) {
1527 adapter->pool_config = 1;
1528 ibmveth_close(netdev);
1529 pool->active = 0;
1530 adapter->pool_config = 0;
1531 if ((rc = ibmveth_open(netdev)))
1532 return rc;
1533 }
1534 pool->active = 0;
1535 }
1536 } else if (attr == &veth_num_attr) {
1537 if (value <= 0 || value > IBMVETH_MAX_POOL_COUNT) {
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->size = value;
1545 if ((rc = ibmveth_open(netdev)))
1546 return rc;
1547 } else {
1548 pool->size = value;
1549 }
1550 }
1551 } else if (attr == &veth_size_attr) {
1552 if (value <= IBMVETH_BUFF_OH || value > IBMVETH_MAX_BUF_SIZE) {
1553 return -EINVAL;
1554 } else {
1555 if (netif_running(netdev)) {
1556 adapter->pool_config = 1;
1557 ibmveth_close(netdev);
1558 adapter->pool_config = 0;
1559 pool->buff_size = value;
1560 if ((rc = ibmveth_open(netdev)))
1561 return rc;
1562 } else {
1563 pool->buff_size = value;
1564 }
1565 }
1566 }
1567
1568 /* kick the interrupt handler to allocate/deallocate pools */
1569 ibmveth_interrupt(netdev->irq, netdev);
1570 return count;
1571 }
1572
1573
1574 #define ATTR(_name, _mode) \
1575 struct attribute veth_##_name##_attr = { \
1576 .name = __stringify(_name), .mode = _mode, \
1577 };
1578
1579 static ATTR(active, 0644);
1580 static ATTR(num, 0644);
1581 static ATTR(size, 0644);
1582
1583 static struct attribute *veth_pool_attrs[] = {
1584 &veth_active_attr,
1585 &veth_num_attr,
1586 &veth_size_attr,
1587 NULL,
1588 };
1589
1590 static const struct sysfs_ops veth_pool_ops = {
1591 .show = veth_pool_show,
1592 .store = veth_pool_store,
1593 };
1594
1595 static struct kobj_type ktype_veth_pool = {
1596 .release = NULL,
1597 .sysfs_ops = &veth_pool_ops,
1598 .default_attrs = veth_pool_attrs,
1599 };
1600
1601 static int ibmveth_resume(struct device *dev)
1602 {
1603 struct net_device *netdev = dev_get_drvdata(dev);
1604 ibmveth_interrupt(netdev->irq, netdev);
1605 return 0;
1606 }
1607
1608 static struct vio_device_id ibmveth_device_table[] = {
1609 { "network", "IBM,l-lan"},
1610 { "", "" }
1611 };
1612 MODULE_DEVICE_TABLE(vio, ibmveth_device_table);
1613
1614 static struct dev_pm_ops ibmveth_pm_ops = {
1615 .resume = ibmveth_resume
1616 };
1617
1618 static struct vio_driver ibmveth_driver = {
1619 .id_table = ibmveth_device_table,
1620 .probe = ibmveth_probe,
1621 .remove = ibmveth_remove,
1622 .get_desired_dma = ibmveth_get_desired_dma,
1623 .name = ibmveth_driver_name,
1624 .pm = &ibmveth_pm_ops,
1625 };
1626
1627 static int __init ibmveth_module_init(void)
1628 {
1629 printk(KERN_DEBUG "%s: %s %s\n", ibmveth_driver_name,
1630 ibmveth_driver_string, ibmveth_driver_version);
1631
1632 return vio_register_driver(&ibmveth_driver);
1633 }
1634
1635 static void __exit ibmveth_module_exit(void)
1636 {
1637 vio_unregister_driver(&ibmveth_driver);
1638 }
1639
1640 module_init(ibmveth_module_init);
1641 module_exit(ibmveth_module_exit);
Linux kernel - Deliverables
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