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ibmveth: Convert driver specific assert to BUG_ON
[deliverable/linux.git] / drivers / net / ibmveth.c
1 /*
2 * IBM eServer i/pSeries Virtual Ethernet Device Driver
3 * Copyright (C) 2003 IBM Corp.
4 * Originally written by Dave Larson (larson1@us.ibm.com)
5 * Maintained by Santiago Leon (santil@us.ibm.com)
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
20 * USA
21 *
22 * This module contains the implementation of a virtual ethernet device
23 * for use with IBM i/pSeries LPAR Linux. It utilizes the logical LAN
24 * option of the RS/6000 Platform Architechture to interface with virtual
25 * ethernet NICs that are presented to the partition by the hypervisor.
26 */
27
28 #include <linux/module.h>
29 #include <linux/moduleparam.h>
30 #include <linux/types.h>
31 #include <linux/errno.h>
32 #include <linux/ioport.h>
33 #include <linux/dma-mapping.h>
34 #include <linux/kernel.h>
35 #include <linux/netdevice.h>
36 #include <linux/etherdevice.h>
37 #include <linux/skbuff.h>
38 #include <linux/init.h>
39 #include <linux/delay.h>
40 #include <linux/mm.h>
41 #include <linux/pm.h>
42 #include <linux/ethtool.h>
43 #include <linux/in.h>
44 #include <linux/ip.h>
45 #include <linux/ipv6.h>
46 #include <linux/slab.h>
47 #include <asm/hvcall.h>
48 #include <asm/atomic.h>
49 #include <asm/vio.h>
50 #include <asm/iommu.h>
51 #include <asm/uaccess.h>
52 #include <asm/firmware.h>
53
54 #include "ibmveth.h"
55
56 static irqreturn_t ibmveth_interrupt(int irq, void *dev_instance);
57 static void ibmveth_rxq_harvest_buffer(struct ibmveth_adapter *adapter);
58 static unsigned long ibmveth_get_desired_dma(struct vio_dev *vdev);
59
60 static struct kobj_type ktype_veth_pool;
61
62
63 static const char ibmveth_driver_name[] = "ibmveth";
64 static const char ibmveth_driver_string[] = "IBM i/pSeries Virtual Ethernet "
65 "Driver";
66 #define ibmveth_driver_version "1.03"
67
68 MODULE_AUTHOR("Santiago Leon <santil@us.ibm.com>");
69 MODULE_DESCRIPTION("IBM i/pSeries Virtual Ethernet Driver");
70 MODULE_LICENSE("GPL");
71 MODULE_VERSION(ibmveth_driver_version);
72
73 static unsigned int tx_copybreak __read_mostly = 128;
74 module_param(tx_copybreak, uint, 0644);
75 MODULE_PARM_DESC(tx_copybreak,
76 "Maximum size of packet that is copied to a new buffer on transmit");
77
78 static unsigned int rx_copybreak __read_mostly = 128;
79 module_param(rx_copybreak, uint, 0644);
80 MODULE_PARM_DESC(rx_copybreak,
81 "Maximum size of packet that is copied to a new buffer on receive");
82
83 static unsigned int rx_flush __read_mostly = 0;
84 module_param(rx_flush, uint, 0644);
85 MODULE_PARM_DESC(rx_flush, "Flush receive buffers before use");
86
87 struct ibmveth_stat {
88 char name[ETH_GSTRING_LEN];
89 int offset;
90 };
91
92 #define IBMVETH_STAT_OFF(stat) offsetof(struct ibmveth_adapter, stat)
93 #define IBMVETH_GET_STAT(a, off) *((u64 *)(((unsigned long)(a)) + off))
94
95 struct ibmveth_stat ibmveth_stats[] = {
96 { "replenish_task_cycles", IBMVETH_STAT_OFF(replenish_task_cycles) },
97 { "replenish_no_mem", IBMVETH_STAT_OFF(replenish_no_mem) },
98 { "replenish_add_buff_failure",
99 IBMVETH_STAT_OFF(replenish_add_buff_failure) },
100 { "replenish_add_buff_success",
101 IBMVETH_STAT_OFF(replenish_add_buff_success) },
102 { "rx_invalid_buffer", IBMVETH_STAT_OFF(rx_invalid_buffer) },
103 { "rx_no_buffer", IBMVETH_STAT_OFF(rx_no_buffer) },
104 { "tx_map_failed", IBMVETH_STAT_OFF(tx_map_failed) },
105 { "tx_send_failed", IBMVETH_STAT_OFF(tx_send_failed) },
106 { "fw_enabled_ipv4_csum", IBMVETH_STAT_OFF(fw_ipv4_csum_support) },
107 { "fw_enabled_ipv6_csum", IBMVETH_STAT_OFF(fw_ipv6_csum_support) },
108 };
109
110 /* simple methods of getting data from the current rxq entry */
111 static inline u32 ibmveth_rxq_flags(struct ibmveth_adapter *adapter)
112 {
113 return adapter->rx_queue.queue_addr[adapter->rx_queue.index].flags_off;
114 }
115
116 static inline int ibmveth_rxq_toggle(struct ibmveth_adapter *adapter)
117 {
118 return (ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_TOGGLE) >>
119 IBMVETH_RXQ_TOGGLE_SHIFT;
120 }
121
122 static inline int ibmveth_rxq_pending_buffer(struct ibmveth_adapter *adapter)
123 {
124 return ibmveth_rxq_toggle(adapter) == adapter->rx_queue.toggle;
125 }
126
127 static inline int ibmveth_rxq_buffer_valid(struct ibmveth_adapter *adapter)
128 {
129 return ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_VALID;
130 }
131
132 static inline int ibmveth_rxq_frame_offset(struct ibmveth_adapter *adapter)
133 {
134 return ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_OFF_MASK;
135 }
136
137 static inline int ibmveth_rxq_frame_length(struct ibmveth_adapter *adapter)
138 {
139 return adapter->rx_queue.queue_addr[adapter->rx_queue.index].length;
140 }
141
142 static inline int ibmveth_rxq_csum_good(struct ibmveth_adapter *adapter)
143 {
144 return ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_CSUM_GOOD;
145 }
146
147 /* setup the initial settings for a buffer pool */
148 static void ibmveth_init_buffer_pool(struct ibmveth_buff_pool *pool,
149 u32 pool_index, u32 pool_size,
150 u32 buff_size, u32 pool_active)
151 {
152 pool->size = pool_size;
153 pool->index = pool_index;
154 pool->buff_size = buff_size;
155 pool->threshold = pool_size * 7 / 8;
156 pool->active = pool_active;
157 }
158
159 /* allocate and setup an buffer pool - called during open */
160 static int ibmveth_alloc_buffer_pool(struct ibmveth_buff_pool *pool)
161 {
162 int i;
163
164 pool->free_map = kmalloc(sizeof(u16) * pool->size, GFP_KERNEL);
165
166 if (!pool->free_map)
167 return -1;
168
169 pool->dma_addr = kmalloc(sizeof(dma_addr_t) * pool->size, GFP_KERNEL);
170 if (!pool->dma_addr) {
171 kfree(pool->free_map);
172 pool->free_map = NULL;
173 return -1;
174 }
175
176 pool->skbuff = kcalloc(pool->size, sizeof(void *), GFP_KERNEL);
177
178 if (!pool->skbuff) {
179 kfree(pool->dma_addr);
180 pool->dma_addr = NULL;
181
182 kfree(pool->free_map);
183 pool->free_map = NULL;
184 return -1;
185 }
186
187 memset(pool->dma_addr, 0, sizeof(dma_addr_t) * pool->size);
188
189 for (i = 0; i < pool->size; ++i)
190 pool->free_map[i] = i;
191
192 atomic_set(&pool->available, 0);
193 pool->producer_index = 0;
194 pool->consumer_index = 0;
195
196 return 0;
197 }
198
199 static inline void ibmveth_flush_buffer(void *addr, unsigned long length)
200 {
201 unsigned long offset;
202
203 for (offset = 0; offset < length; offset += SMP_CACHE_BYTES)
204 asm("dcbfl %0,%1" :: "b" (addr), "r" (offset));
205 }
206
207 /* replenish the buffers for a pool. note that we don't need to
208 * skb_reserve these since they are used for incoming...
209 */
210 static void ibmveth_replenish_buffer_pool(struct ibmveth_adapter *adapter,
211 struct ibmveth_buff_pool *pool)
212 {
213 u32 i;
214 u32 count = pool->size - atomic_read(&pool->available);
215 u32 buffers_added = 0;
216 struct sk_buff *skb;
217 unsigned int free_index, index;
218 u64 correlator;
219 unsigned long lpar_rc;
220 dma_addr_t dma_addr;
221
222 mb();
223
224 for (i = 0; i < count; ++i) {
225 union ibmveth_buf_desc desc;
226
227 skb = netdev_alloc_skb(adapter->netdev, pool->buff_size);
228
229 if (!skb) {
230 netdev_dbg(adapter->netdev,
231 "replenish: unable to allocate skb\n");
232 adapter->replenish_no_mem++;
233 break;
234 }
235
236 free_index = pool->consumer_index;
237 pool->consumer_index++;
238 if (pool->consumer_index >= pool->size)
239 pool->consumer_index = 0;
240 index = pool->free_map[free_index];
241
242 BUG_ON(index == IBM_VETH_INVALID_MAP);
243 BUG_ON(pool->skbuff[index] != NULL);
244
245 dma_addr = dma_map_single(&adapter->vdev->dev, skb->data,
246 pool->buff_size, DMA_FROM_DEVICE);
247
248 if (dma_mapping_error(&adapter->vdev->dev, dma_addr))
249 goto failure;
250
251 pool->free_map[free_index] = IBM_VETH_INVALID_MAP;
252 pool->dma_addr[index] = dma_addr;
253 pool->skbuff[index] = skb;
254
255 correlator = ((u64)pool->index << 32) | index;
256 *(u64 *)skb->data = correlator;
257
258 desc.fields.flags_len = IBMVETH_BUF_VALID | pool->buff_size;
259 desc.fields.address = dma_addr;
260
261 if (rx_flush) {
262 unsigned int len = min(pool->buff_size,
263 adapter->netdev->mtu +
264 IBMVETH_BUFF_OH);
265 ibmveth_flush_buffer(skb->data, len);
266 }
267 lpar_rc = h_add_logical_lan_buffer(adapter->vdev->unit_address,
268 desc.desc);
269
270 if (lpar_rc != H_SUCCESS) {
271 goto failure;
272 } else {
273 buffers_added++;
274 adapter->replenish_add_buff_success++;
275 }
276 }
277
278 mb();
279 atomic_add(buffers_added, &(pool->available));
280 return;
281
282 failure:
283 pool->free_map[free_index] = index;
284 pool->skbuff[index] = NULL;
285 if (pool->consumer_index == 0)
286 pool->consumer_index = pool->size - 1;
287 else
288 pool->consumer_index--;
289 if (!dma_mapping_error(&adapter->vdev->dev, dma_addr))
290 dma_unmap_single(&adapter->vdev->dev,
291 pool->dma_addr[index], pool->buff_size,
292 DMA_FROM_DEVICE);
293 dev_kfree_skb_any(skb);
294 adapter->replenish_add_buff_failure++;
295
296 mb();
297 atomic_add(buffers_added, &(pool->available));
298 }
299
300 /* replenish routine */
301 static void ibmveth_replenish_task(struct ibmveth_adapter *adapter)
302 {
303 int i;
304
305 adapter->replenish_task_cycles++;
306
307 for (i = (IBMVETH_NUM_BUFF_POOLS - 1); i >= 0; i--) {
308 struct ibmveth_buff_pool *pool = &adapter->rx_buff_pool[i];
309
310 if (pool->active &&
311 (atomic_read(&pool->available) < pool->threshold))
312 ibmveth_replenish_buffer_pool(adapter, pool);
313 }
314
315 adapter->rx_no_buffer = *(u64 *)(((char*)adapter->buffer_list_addr) +
316 4096 - 8);
317 }
318
319 /* empty and free ana buffer pool - also used to do cleanup in error paths */
320 static void ibmveth_free_buffer_pool(struct ibmveth_adapter *adapter,
321 struct ibmveth_buff_pool *pool)
322 {
323 int i;
324
325 kfree(pool->free_map);
326 pool->free_map = NULL;
327
328 if (pool->skbuff && pool->dma_addr) {
329 for (i = 0; i < pool->size; ++i) {
330 struct sk_buff *skb = pool->skbuff[i];
331 if (skb) {
332 dma_unmap_single(&adapter->vdev->dev,
333 pool->dma_addr[i],
334 pool->buff_size,
335 DMA_FROM_DEVICE);
336 dev_kfree_skb_any(skb);
337 pool->skbuff[i] = NULL;
338 }
339 }
340 }
341
342 if (pool->dma_addr) {
343 kfree(pool->dma_addr);
344 pool->dma_addr = NULL;
345 }
346
347 if (pool->skbuff) {
348 kfree(pool->skbuff);
349 pool->skbuff = NULL;
350 }
351 }
352
353 /* remove a buffer from a pool */
354 static void ibmveth_remove_buffer_from_pool(struct ibmveth_adapter *adapter,
355 u64 correlator)
356 {
357 unsigned int pool = correlator >> 32;
358 unsigned int index = correlator & 0xffffffffUL;
359 unsigned int free_index;
360 struct sk_buff *skb;
361
362 BUG_ON(pool >= IBMVETH_NUM_BUFF_POOLS);
363 BUG_ON(index >= adapter->rx_buff_pool[pool].size);
364
365 skb = adapter->rx_buff_pool[pool].skbuff[index];
366
367 BUG_ON(skb == NULL);
368
369 adapter->rx_buff_pool[pool].skbuff[index] = NULL;
370
371 dma_unmap_single(&adapter->vdev->dev,
372 adapter->rx_buff_pool[pool].dma_addr[index],
373 adapter->rx_buff_pool[pool].buff_size,
374 DMA_FROM_DEVICE);
375
376 free_index = adapter->rx_buff_pool[pool].producer_index;
377 adapter->rx_buff_pool[pool].producer_index++;
378 if (adapter->rx_buff_pool[pool].producer_index >=
379 adapter->rx_buff_pool[pool].size)
380 adapter->rx_buff_pool[pool].producer_index = 0;
381 adapter->rx_buff_pool[pool].free_map[free_index] = index;
382
383 mb();
384
385 atomic_dec(&(adapter->rx_buff_pool[pool].available));
386 }
387
388 /* get the current buffer on the rx queue */
389 static inline struct sk_buff *ibmveth_rxq_get_buffer(struct ibmveth_adapter *adapter)
390 {
391 u64 correlator = adapter->rx_queue.queue_addr[adapter->rx_queue.index].correlator;
392 unsigned int pool = correlator >> 32;
393 unsigned int index = correlator & 0xffffffffUL;
394
395 BUG_ON(pool >= IBMVETH_NUM_BUFF_POOLS);
396 BUG_ON(index >= adapter->rx_buff_pool[pool].size);
397
398 return adapter->rx_buff_pool[pool].skbuff[index];
399 }
400
401 /* recycle the current buffer on the rx queue */
402 static void ibmveth_rxq_recycle_buffer(struct ibmveth_adapter *adapter)
403 {
404 u32 q_index = adapter->rx_queue.index;
405 u64 correlator = adapter->rx_queue.queue_addr[q_index].correlator;
406 unsigned int pool = correlator >> 32;
407 unsigned int index = correlator & 0xffffffffUL;
408 union ibmveth_buf_desc desc;
409 unsigned long lpar_rc;
410
411 BUG_ON(pool >= IBMVETH_NUM_BUFF_POOLS);
412 BUG_ON(index >= adapter->rx_buff_pool[pool].size);
413
414 if (!adapter->rx_buff_pool[pool].active) {
415 ibmveth_rxq_harvest_buffer(adapter);
416 ibmveth_free_buffer_pool(adapter, &adapter->rx_buff_pool[pool]);
417 return;
418 }
419
420 desc.fields.flags_len = IBMVETH_BUF_VALID |
421 adapter->rx_buff_pool[pool].buff_size;
422 desc.fields.address = adapter->rx_buff_pool[pool].dma_addr[index];
423
424 lpar_rc = h_add_logical_lan_buffer(adapter->vdev->unit_address, desc.desc);
425
426 if (lpar_rc != H_SUCCESS) {
427 netdev_dbg(adapter->netdev, "h_add_logical_lan_buffer failed "
428 "during recycle rc=%ld", lpar_rc);
429 ibmveth_remove_buffer_from_pool(adapter, adapter->rx_queue.queue_addr[adapter->rx_queue.index].correlator);
430 }
431
432 if (++adapter->rx_queue.index == adapter->rx_queue.num_slots) {
433 adapter->rx_queue.index = 0;
434 adapter->rx_queue.toggle = !adapter->rx_queue.toggle;
435 }
436 }
437
438 static void ibmveth_rxq_harvest_buffer(struct ibmveth_adapter *adapter)
439 {
440 ibmveth_remove_buffer_from_pool(adapter, adapter->rx_queue.queue_addr[adapter->rx_queue.index].correlator);
441
442 if (++adapter->rx_queue.index == adapter->rx_queue.num_slots) {
443 adapter->rx_queue.index = 0;
444 adapter->rx_queue.toggle = !adapter->rx_queue.toggle;
445 }
446 }
447
448 static void ibmveth_cleanup(struct ibmveth_adapter *adapter)
449 {
450 int i;
451 struct device *dev = &adapter->vdev->dev;
452
453 if (adapter->buffer_list_addr != NULL) {
454 if (!dma_mapping_error(dev, adapter->buffer_list_dma)) {
455 dma_unmap_single(dev, adapter->buffer_list_dma, 4096,
456 DMA_BIDIRECTIONAL);
457 adapter->buffer_list_dma = DMA_ERROR_CODE;
458 }
459 free_page((unsigned long)adapter->buffer_list_addr);
460 adapter->buffer_list_addr = NULL;
461 }
462
463 if (adapter->filter_list_addr != NULL) {
464 if (!dma_mapping_error(dev, adapter->filter_list_dma)) {
465 dma_unmap_single(dev, adapter->filter_list_dma, 4096,
466 DMA_BIDIRECTIONAL);
467 adapter->filter_list_dma = DMA_ERROR_CODE;
468 }
469 free_page((unsigned long)adapter->filter_list_addr);
470 adapter->filter_list_addr = NULL;
471 }
472
473 if (adapter->rx_queue.queue_addr != NULL) {
474 if (!dma_mapping_error(dev, adapter->rx_queue.queue_dma)) {
475 dma_unmap_single(dev,
476 adapter->rx_queue.queue_dma,
477 adapter->rx_queue.queue_len,
478 DMA_BIDIRECTIONAL);
479 adapter->rx_queue.queue_dma = DMA_ERROR_CODE;
480 }
481 kfree(adapter->rx_queue.queue_addr);
482 adapter->rx_queue.queue_addr = NULL;
483 }
484
485 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
486 if (adapter->rx_buff_pool[i].active)
487 ibmveth_free_buffer_pool(adapter,
488 &adapter->rx_buff_pool[i]);
489
490 if (adapter->bounce_buffer != NULL) {
491 if (!dma_mapping_error(dev, adapter->bounce_buffer_dma)) {
492 dma_unmap_single(&adapter->vdev->dev,
493 adapter->bounce_buffer_dma,
494 adapter->netdev->mtu + IBMVETH_BUFF_OH,
495 DMA_BIDIRECTIONAL);
496 adapter->bounce_buffer_dma = DMA_ERROR_CODE;
497 }
498 kfree(adapter->bounce_buffer);
499 adapter->bounce_buffer = NULL;
500 }
501 }
502
503 static int ibmveth_register_logical_lan(struct ibmveth_adapter *adapter,
504 union ibmveth_buf_desc rxq_desc, u64 mac_address)
505 {
506 int rc, try_again = 1;
507
508 /*
509 * After a kexec the adapter will still be open, so our attempt to
510 * open it will fail. So if we get a failure we free the adapter and
511 * try again, but only once.
512 */
513 retry:
514 rc = h_register_logical_lan(adapter->vdev->unit_address,
515 adapter->buffer_list_dma, rxq_desc.desc,
516 adapter->filter_list_dma, mac_address);
517
518 if (rc != H_SUCCESS && try_again) {
519 do {
520 rc = h_free_logical_lan(adapter->vdev->unit_address);
521 } while (H_IS_LONG_BUSY(rc) || (rc == H_BUSY));
522
523 try_again = 0;
524 goto retry;
525 }
526
527 return rc;
528 }
529
530 static int ibmveth_open(struct net_device *netdev)
531 {
532 struct ibmveth_adapter *adapter = netdev_priv(netdev);
533 u64 mac_address = 0;
534 int rxq_entries = 1;
535 unsigned long lpar_rc;
536 int rc;
537 union ibmveth_buf_desc rxq_desc;
538 int i;
539 struct device *dev;
540
541 netdev_dbg(netdev, "open starting\n");
542
543 napi_enable(&adapter->napi);
544
545 for(i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
546 rxq_entries += adapter->rx_buff_pool[i].size;
547
548 adapter->buffer_list_addr = (void*) get_zeroed_page(GFP_KERNEL);
549 adapter->filter_list_addr = (void*) get_zeroed_page(GFP_KERNEL);
550
551 if (!adapter->buffer_list_addr || !adapter->filter_list_addr) {
552 netdev_err(netdev, "unable to allocate filter or buffer list "
553 "pages\n");
554 ibmveth_cleanup(adapter);
555 napi_disable(&adapter->napi);
556 return -ENOMEM;
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 ibmveth_cleanup(adapter);
567 napi_disable(&adapter->napi);
568 return -ENOMEM;
569 }
570
571 dev = &adapter->vdev->dev;
572
573 adapter->buffer_list_dma = dma_map_single(dev,
574 adapter->buffer_list_addr, 4096, DMA_BIDIRECTIONAL);
575 adapter->filter_list_dma = dma_map_single(dev,
576 adapter->filter_list_addr, 4096, DMA_BIDIRECTIONAL);
577 adapter->rx_queue.queue_dma = dma_map_single(dev,
578 adapter->rx_queue.queue_addr,
579 adapter->rx_queue.queue_len, DMA_BIDIRECTIONAL);
580
581 if ((dma_mapping_error(dev, adapter->buffer_list_dma)) ||
582 (dma_mapping_error(dev, adapter->filter_list_dma)) ||
583 (dma_mapping_error(dev, adapter->rx_queue.queue_dma))) {
584 netdev_err(netdev, "unable to map filter or buffer list "
585 "pages\n");
586 ibmveth_cleanup(adapter);
587 napi_disable(&adapter->napi);
588 return -ENOMEM;
589 }
590
591 adapter->rx_queue.index = 0;
592 adapter->rx_queue.num_slots = rxq_entries;
593 adapter->rx_queue.toggle = 1;
594
595 memcpy(&mac_address, netdev->dev_addr, netdev->addr_len);
596 mac_address = mac_address >> 16;
597
598 rxq_desc.fields.flags_len = IBMVETH_BUF_VALID |
599 adapter->rx_queue.queue_len;
600 rxq_desc.fields.address = adapter->rx_queue.queue_dma;
601
602 netdev_dbg(netdev, "buffer list @ 0x%p\n", adapter->buffer_list_addr);
603 netdev_dbg(netdev, "filter list @ 0x%p\n", adapter->filter_list_addr);
604 netdev_dbg(netdev, "receive q @ 0x%p\n", adapter->rx_queue.queue_addr);
605
606 h_vio_signal(adapter->vdev->unit_address, VIO_IRQ_DISABLE);
607
608 lpar_rc = ibmveth_register_logical_lan(adapter, rxq_desc, mac_address);
609
610 if (lpar_rc != H_SUCCESS) {
611 netdev_err(netdev, "h_register_logical_lan failed with %ld\n",
612 lpar_rc);
613 netdev_err(netdev, "buffer TCE:0x%llx filter TCE:0x%llx rxq "
614 "desc:0x%llx MAC:0x%llx\n",
615 adapter->buffer_list_dma,
616 adapter->filter_list_dma,
617 rxq_desc.desc,
618 mac_address);
619 ibmveth_cleanup(adapter);
620 napi_disable(&adapter->napi);
621 return -ENONET;
622 }
623
624 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
625 if (!adapter->rx_buff_pool[i].active)
626 continue;
627 if (ibmveth_alloc_buffer_pool(&adapter->rx_buff_pool[i])) {
628 netdev_err(netdev, "unable to alloc pool\n");
629 adapter->rx_buff_pool[i].active = 0;
630 ibmveth_cleanup(adapter);
631 napi_disable(&adapter->napi);
632 return -ENOMEM ;
633 }
634 }
635
636 netdev_dbg(netdev, "registering irq 0x%x\n", netdev->irq);
637 rc = request_irq(netdev->irq, ibmveth_interrupt, 0, netdev->name,
638 netdev);
639 if (rc != 0) {
640 netdev_err(netdev, "unable to request irq 0x%x, rc %d\n",
641 netdev->irq, rc);
642 do {
643 rc = h_free_logical_lan(adapter->vdev->unit_address);
644 } while (H_IS_LONG_BUSY(rc) || (rc == H_BUSY));
645
646 ibmveth_cleanup(adapter);
647 napi_disable(&adapter->napi);
648 return rc;
649 }
650
651 adapter->bounce_buffer =
652 kmalloc(netdev->mtu + IBMVETH_BUFF_OH, GFP_KERNEL);
653 if (!adapter->bounce_buffer) {
654 netdev_err(netdev, "unable to allocate bounce buffer\n");
655 ibmveth_cleanup(adapter);
656 napi_disable(&adapter->napi);
657 return -ENOMEM;
658 }
659 adapter->bounce_buffer_dma =
660 dma_map_single(&adapter->vdev->dev, adapter->bounce_buffer,
661 netdev->mtu + IBMVETH_BUFF_OH, DMA_BIDIRECTIONAL);
662 if (dma_mapping_error(dev, adapter->bounce_buffer_dma)) {
663 netdev_err(netdev, "unable to map bounce buffer\n");
664 ibmveth_cleanup(adapter);
665 napi_disable(&adapter->napi);
666 return -ENOMEM;
667 }
668
669 netdev_dbg(netdev, "initial replenish cycle\n");
670 ibmveth_interrupt(netdev->irq, netdev);
671
672 netif_start_queue(netdev);
673
674 netdev_dbg(netdev, "open complete\n");
675
676 return 0;
677 }
678
679 static int ibmveth_close(struct net_device *netdev)
680 {
681 struct ibmveth_adapter *adapter = netdev_priv(netdev);
682 long lpar_rc;
683
684 netdev_dbg(netdev, "close starting\n");
685
686 napi_disable(&adapter->napi);
687
688 if (!adapter->pool_config)
689 netif_stop_queue(netdev);
690
691 h_vio_signal(adapter->vdev->unit_address, VIO_IRQ_DISABLE);
692
693 do {
694 lpar_rc = h_free_logical_lan(adapter->vdev->unit_address);
695 } while (H_IS_LONG_BUSY(lpar_rc) || (lpar_rc == H_BUSY));
696
697 if (lpar_rc != H_SUCCESS) {
698 netdev_err(netdev, "h_free_logical_lan failed with %lx, "
699 "continuing with close\n", lpar_rc);
700 }
701
702 free_irq(netdev->irq, netdev);
703
704 adapter->rx_no_buffer = *(u64 *)(((char *)adapter->buffer_list_addr) +
705 4096 - 8);
706
707 ibmveth_cleanup(adapter);
708
709 netdev_dbg(netdev, "close complete\n");
710
711 return 0;
712 }
713
714 static int netdev_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
715 {
716 cmd->supported = (SUPPORTED_1000baseT_Full | SUPPORTED_Autoneg |
717 SUPPORTED_FIBRE);
718 cmd->advertising = (ADVERTISED_1000baseT_Full | ADVERTISED_Autoneg |
719 ADVERTISED_FIBRE);
720 cmd->speed = SPEED_1000;
721 cmd->duplex = DUPLEX_FULL;
722 cmd->port = PORT_FIBRE;
723 cmd->phy_address = 0;
724 cmd->transceiver = XCVR_INTERNAL;
725 cmd->autoneg = AUTONEG_ENABLE;
726 cmd->maxtxpkt = 0;
727 cmd->maxrxpkt = 1;
728 return 0;
729 }
730
731 static void netdev_get_drvinfo(struct net_device *dev,
732 struct ethtool_drvinfo *info)
733 {
734 strncpy(info->driver, ibmveth_driver_name, sizeof(info->driver) - 1);
735 strncpy(info->version, ibmveth_driver_version,
736 sizeof(info->version) - 1);
737 }
738
739 static u32 netdev_get_link(struct net_device *dev)
740 {
741 return 1;
742 }
743
744 static void ibmveth_set_rx_csum_flags(struct net_device *dev, u32 data)
745 {
746 struct ibmveth_adapter *adapter = netdev_priv(dev);
747
748 if (data) {
749 adapter->rx_csum = 1;
750 } else {
751 /*
752 * Since the ibmveth firmware interface does not have the
753 * concept of separate tx/rx checksum offload enable, if rx
754 * checksum is disabled we also have to disable tx checksum
755 * offload. Once we disable rx checksum offload, we are no
756 * longer allowed to send tx buffers that are not properly
757 * checksummed.
758 */
759 adapter->rx_csum = 0;
760 dev->features &= ~NETIF_F_IP_CSUM;
761 dev->features &= ~NETIF_F_IPV6_CSUM;
762 }
763 }
764
765 static void ibmveth_set_tx_csum_flags(struct net_device *dev, u32 data)
766 {
767 struct ibmveth_adapter *adapter = netdev_priv(dev);
768
769 if (data) {
770 if (adapter->fw_ipv4_csum_support)
771 dev->features |= NETIF_F_IP_CSUM;
772 if (adapter->fw_ipv6_csum_support)
773 dev->features |= NETIF_F_IPV6_CSUM;
774 adapter->rx_csum = 1;
775 } else {
776 dev->features &= ~NETIF_F_IP_CSUM;
777 dev->features &= ~NETIF_F_IPV6_CSUM;
778 }
779 }
780
781 static int ibmveth_set_csum_offload(struct net_device *dev, u32 data,
782 void (*done) (struct net_device *, u32))
783 {
784 struct ibmveth_adapter *adapter = netdev_priv(dev);
785 unsigned long set_attr, clr_attr, ret_attr;
786 unsigned long set_attr6, clr_attr6;
787 long ret, ret6;
788 int rc1 = 0, rc2 = 0;
789 int restart = 0;
790
791 if (netif_running(dev)) {
792 restart = 1;
793 adapter->pool_config = 1;
794 ibmveth_close(dev);
795 adapter->pool_config = 0;
796 }
797
798 set_attr = 0;
799 clr_attr = 0;
800
801 if (data) {
802 set_attr = IBMVETH_ILLAN_IPV4_TCP_CSUM;
803 set_attr6 = IBMVETH_ILLAN_IPV6_TCP_CSUM;
804 } else {
805 clr_attr = IBMVETH_ILLAN_IPV4_TCP_CSUM;
806 clr_attr6 = IBMVETH_ILLAN_IPV6_TCP_CSUM;
807 }
808
809 ret = h_illan_attributes(adapter->vdev->unit_address, 0, 0, &ret_attr);
810
811 if (ret == H_SUCCESS && !(ret_attr & IBMVETH_ILLAN_ACTIVE_TRUNK) &&
812 !(ret_attr & IBMVETH_ILLAN_TRUNK_PRI_MASK) &&
813 (ret_attr & IBMVETH_ILLAN_PADDED_PKT_CSUM)) {
814 ret = h_illan_attributes(adapter->vdev->unit_address, clr_attr,
815 set_attr, &ret_attr);
816
817 if (ret != H_SUCCESS) {
818 netdev_err(dev, "unable to change IPv4 checksum "
819 "offload settings. %d rc=%ld\n",
820 data, ret);
821
822 ret = h_illan_attributes(adapter->vdev->unit_address,
823 set_attr, clr_attr, &ret_attr);
824 } else {
825 adapter->fw_ipv4_csum_support = data;
826 }
827
828 ret6 = h_illan_attributes(adapter->vdev->unit_address,
829 clr_attr6, set_attr6, &ret_attr);
830
831 if (ret6 != H_SUCCESS) {
832 netdev_err(dev, "unable to change IPv6 checksum "
833 "offload settings. %d rc=%ld\n",
834 data, ret);
835
836 ret = h_illan_attributes(adapter->vdev->unit_address,
837 set_attr6, clr_attr6,
838 &ret_attr);
839 } else
840 adapter->fw_ipv6_csum_support = data;
841
842 if (ret == H_SUCCESS || ret6 == H_SUCCESS)
843 done(dev, data);
844 else
845 rc1 = -EIO;
846 } else {
847 rc1 = -EIO;
848 netdev_err(dev, "unable to change checksum offload settings."
849 " %d rc=%ld ret_attr=%lx\n", data, ret,
850 ret_attr);
851 }
852
853 if (restart)
854 rc2 = ibmveth_open(dev);
855
856 return rc1 ? rc1 : rc2;
857 }
858
859 static int ibmveth_set_rx_csum(struct net_device *dev, u32 data)
860 {
861 struct ibmveth_adapter *adapter = netdev_priv(dev);
862
863 if ((data && adapter->rx_csum) || (!data && !adapter->rx_csum))
864 return 0;
865
866 return ibmveth_set_csum_offload(dev, data, ibmveth_set_rx_csum_flags);
867 }
868
869 static int ibmveth_set_tx_csum(struct net_device *dev, u32 data)
870 {
871 struct ibmveth_adapter *adapter = netdev_priv(dev);
872 int rc = 0;
873
874 if (data && (dev->features & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM)))
875 return 0;
876 if (!data && !(dev->features & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM)))
877 return 0;
878
879 if (data && !adapter->rx_csum)
880 rc = ibmveth_set_csum_offload(dev, data,
881 ibmveth_set_tx_csum_flags);
882 else
883 ibmveth_set_tx_csum_flags(dev, data);
884
885 return rc;
886 }
887
888 static u32 ibmveth_get_rx_csum(struct net_device *dev)
889 {
890 struct ibmveth_adapter *adapter = netdev_priv(dev);
891 return adapter->rx_csum;
892 }
893
894 static void ibmveth_get_strings(struct net_device *dev, u32 stringset, u8 *data)
895 {
896 int i;
897
898 if (stringset != ETH_SS_STATS)
899 return;
900
901 for (i = 0; i < ARRAY_SIZE(ibmveth_stats); i++, data += ETH_GSTRING_LEN)
902 memcpy(data, ibmveth_stats[i].name, ETH_GSTRING_LEN);
903 }
904
905 static int ibmveth_get_sset_count(struct net_device *dev, int sset)
906 {
907 switch (sset) {
908 case ETH_SS_STATS:
909 return ARRAY_SIZE(ibmveth_stats);
910 default:
911 return -EOPNOTSUPP;
912 }
913 }
914
915 static void ibmveth_get_ethtool_stats(struct net_device *dev,
916 struct ethtool_stats *stats, u64 *data)
917 {
918 int i;
919 struct ibmveth_adapter *adapter = netdev_priv(dev);
920
921 for (i = 0; i < ARRAY_SIZE(ibmveth_stats); i++)
922 data[i] = IBMVETH_GET_STAT(adapter, ibmveth_stats[i].offset);
923 }
924
925 static const struct ethtool_ops netdev_ethtool_ops = {
926 .get_drvinfo = netdev_get_drvinfo,
927 .get_settings = netdev_get_settings,
928 .get_link = netdev_get_link,
929 .set_tx_csum = ibmveth_set_tx_csum,
930 .get_rx_csum = ibmveth_get_rx_csum,
931 .set_rx_csum = ibmveth_set_rx_csum,
932 .get_strings = ibmveth_get_strings,
933 .get_sset_count = ibmveth_get_sset_count,
934 .get_ethtool_stats = ibmveth_get_ethtool_stats,
935 .set_sg = ethtool_op_set_sg,
936 };
937
938 static int ibmveth_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
939 {
940 return -EOPNOTSUPP;
941 }
942
943 #define page_offset(v) ((unsigned long)(v) & ((1 << 12) - 1))
944
945 static int ibmveth_send(struct ibmveth_adapter *adapter,
946 union ibmveth_buf_desc *descs)
947 {
948 unsigned long correlator;
949 unsigned int retry_count;
950 unsigned long ret;
951
952 /*
953 * The retry count sets a maximum for the number of broadcast and
954 * multicast destinations within the system.
955 */
956 retry_count = 1024;
957 correlator = 0;
958 do {
959 ret = h_send_logical_lan(adapter->vdev->unit_address,
960 descs[0].desc, descs[1].desc,
961 descs[2].desc, descs[3].desc,
962 descs[4].desc, descs[5].desc,
963 correlator, &correlator);
964 } while ((ret == H_BUSY) && (retry_count--));
965
966 if (ret != H_SUCCESS && ret != H_DROPPED) {
967 netdev_err(adapter->netdev, "tx: h_send_logical_lan failed "
968 "with rc=%ld\n", ret);
969 return 1;
970 }
971
972 return 0;
973 }
974
975 static netdev_tx_t ibmveth_start_xmit(struct sk_buff *skb,
976 struct net_device *netdev)
977 {
978 struct ibmveth_adapter *adapter = netdev_priv(netdev);
979 unsigned int desc_flags;
980 union ibmveth_buf_desc descs[6];
981 int last, i;
982 int force_bounce = 0;
983
984 /*
985 * veth handles a maximum of 6 segments including the header, so
986 * we have to linearize the skb if there are more than this.
987 */
988 if (skb_shinfo(skb)->nr_frags > 5 && __skb_linearize(skb)) {
989 netdev->stats.tx_dropped++;
990 goto out;
991 }
992
993 /* veth can't checksum offload UDP */
994 if (skb->ip_summed == CHECKSUM_PARTIAL &&
995 ((skb->protocol == htons(ETH_P_IP) &&
996 ip_hdr(skb)->protocol != IPPROTO_TCP) ||
997 (skb->protocol == htons(ETH_P_IPV6) &&
998 ipv6_hdr(skb)->nexthdr != IPPROTO_TCP)) &&
999 skb_checksum_help(skb)) {
1000
1001 netdev_err(netdev, "tx: failed to checksum packet\n");
1002 netdev->stats.tx_dropped++;
1003 goto out;
1004 }
1005
1006 desc_flags = IBMVETH_BUF_VALID;
1007
1008 if (skb->ip_summed == CHECKSUM_PARTIAL) {
1009 unsigned char *buf = skb_transport_header(skb) +
1010 skb->csum_offset;
1011
1012 desc_flags |= (IBMVETH_BUF_NO_CSUM | IBMVETH_BUF_CSUM_GOOD);
1013
1014 /* Need to zero out the checksum */
1015 buf[0] = 0;
1016 buf[1] = 0;
1017 }
1018
1019 retry_bounce:
1020 memset(descs, 0, sizeof(descs));
1021
1022 /*
1023 * If a linear packet is below the rx threshold then
1024 * copy it into the static bounce buffer. This avoids the
1025 * cost of a TCE insert and remove.
1026 */
1027 if (force_bounce || (!skb_is_nonlinear(skb) &&
1028 (skb->len < tx_copybreak))) {
1029 skb_copy_from_linear_data(skb, adapter->bounce_buffer,
1030 skb->len);
1031
1032 descs[0].fields.flags_len = desc_flags | skb->len;
1033 descs[0].fields.address = adapter->bounce_buffer_dma;
1034
1035 if (ibmveth_send(adapter, descs)) {
1036 adapter->tx_send_failed++;
1037 netdev->stats.tx_dropped++;
1038 } else {
1039 netdev->stats.tx_packets++;
1040 netdev->stats.tx_bytes += skb->len;
1041 }
1042
1043 goto out;
1044 }
1045
1046 /* Map the header */
1047 descs[0].fields.address = dma_map_single(&adapter->vdev->dev, skb->data,
1048 skb_headlen(skb),
1049 DMA_TO_DEVICE);
1050 if (dma_mapping_error(&adapter->vdev->dev, descs[0].fields.address))
1051 goto map_failed;
1052
1053 descs[0].fields.flags_len = desc_flags | skb_headlen(skb);
1054
1055 /* Map the frags */
1056 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1057 unsigned long dma_addr;
1058 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1059
1060 dma_addr = dma_map_page(&adapter->vdev->dev, frag->page,
1061 frag->page_offset, frag->size,
1062 DMA_TO_DEVICE);
1063
1064 if (dma_mapping_error(&adapter->vdev->dev, dma_addr))
1065 goto map_failed_frags;
1066
1067 descs[i+1].fields.flags_len = desc_flags | frag->size;
1068 descs[i+1].fields.address = dma_addr;
1069 }
1070
1071 if (ibmveth_send(adapter, descs)) {
1072 adapter->tx_send_failed++;
1073 netdev->stats.tx_dropped++;
1074 } else {
1075 netdev->stats.tx_packets++;
1076 netdev->stats.tx_bytes += skb->len;
1077 }
1078
1079 for (i = 0; i < skb_shinfo(skb)->nr_frags + 1; i++)
1080 dma_unmap_page(&adapter->vdev->dev, descs[i].fields.address,
1081 descs[i].fields.flags_len & IBMVETH_BUF_LEN_MASK,
1082 DMA_TO_DEVICE);
1083
1084 out:
1085 dev_kfree_skb(skb);
1086 return NETDEV_TX_OK;
1087
1088 map_failed_frags:
1089 last = i+1;
1090 for (i = 0; i < last; i++)
1091 dma_unmap_page(&adapter->vdev->dev, descs[i].fields.address,
1092 descs[i].fields.flags_len & IBMVETH_BUF_LEN_MASK,
1093 DMA_TO_DEVICE);
1094
1095 map_failed:
1096 if (!firmware_has_feature(FW_FEATURE_CMO))
1097 netdev_err(netdev, "tx: unable to map xmit buffer\n");
1098 adapter->tx_map_failed++;
1099 skb_linearize(skb);
1100 force_bounce = 1;
1101 goto retry_bounce;
1102 }
1103
1104 static int ibmveth_poll(struct napi_struct *napi, int budget)
1105 {
1106 struct ibmveth_adapter *adapter =
1107 container_of(napi, struct ibmveth_adapter, napi);
1108 struct net_device *netdev = adapter->netdev;
1109 int frames_processed = 0;
1110 unsigned long lpar_rc;
1111
1112 restart_poll:
1113 do {
1114 if (!ibmveth_rxq_pending_buffer(adapter))
1115 break;
1116
1117 smp_rmb();
1118 if (!ibmveth_rxq_buffer_valid(adapter)) {
1119 wmb(); /* suggested by larson1 */
1120 adapter->rx_invalid_buffer++;
1121 netdev_dbg(netdev, "recycling invalid buffer\n");
1122 ibmveth_rxq_recycle_buffer(adapter);
1123 } else {
1124 struct sk_buff *skb, *new_skb;
1125 int length = ibmveth_rxq_frame_length(adapter);
1126 int offset = ibmveth_rxq_frame_offset(adapter);
1127 int csum_good = ibmveth_rxq_csum_good(adapter);
1128
1129 skb = ibmveth_rxq_get_buffer(adapter);
1130
1131 new_skb = NULL;
1132 if (length < rx_copybreak)
1133 new_skb = netdev_alloc_skb(netdev, length);
1134
1135 if (new_skb) {
1136 skb_copy_to_linear_data(new_skb,
1137 skb->data + offset,
1138 length);
1139 if (rx_flush)
1140 ibmveth_flush_buffer(skb->data,
1141 length + offset);
1142 skb = new_skb;
1143 ibmveth_rxq_recycle_buffer(adapter);
1144 } else {
1145 ibmveth_rxq_harvest_buffer(adapter);
1146 skb_reserve(skb, offset);
1147 }
1148
1149 skb_put(skb, length);
1150 skb->protocol = eth_type_trans(skb, netdev);
1151
1152 if (csum_good)
1153 skb->ip_summed = CHECKSUM_UNNECESSARY;
1154
1155 netif_receive_skb(skb); /* send it up */
1156
1157 netdev->stats.rx_packets++;
1158 netdev->stats.rx_bytes += length;
1159 frames_processed++;
1160 }
1161 } while (frames_processed < budget);
1162
1163 ibmveth_replenish_task(adapter);
1164
1165 if (frames_processed < budget) {
1166 /* We think we are done - reenable interrupts,
1167 * then check once more to make sure we are done.
1168 */
1169 lpar_rc = h_vio_signal(adapter->vdev->unit_address,
1170 VIO_IRQ_ENABLE);
1171
1172 BUG_ON(lpar_rc != H_SUCCESS);
1173
1174 napi_complete(napi);
1175
1176 if (ibmveth_rxq_pending_buffer(adapter) &&
1177 napi_reschedule(napi)) {
1178 lpar_rc = h_vio_signal(adapter->vdev->unit_address,
1179 VIO_IRQ_DISABLE);
1180 goto restart_poll;
1181 }
1182 }
1183
1184 return frames_processed;
1185 }
1186
1187 static irqreturn_t ibmveth_interrupt(int irq, void *dev_instance)
1188 {
1189 struct net_device *netdev = dev_instance;
1190 struct ibmveth_adapter *adapter = netdev_priv(netdev);
1191 unsigned long lpar_rc;
1192
1193 if (napi_schedule_prep(&adapter->napi)) {
1194 lpar_rc = h_vio_signal(adapter->vdev->unit_address,
1195 VIO_IRQ_DISABLE);
1196 BUG_ON(lpar_rc != H_SUCCESS);
1197 __napi_schedule(&adapter->napi);
1198 }
1199 return IRQ_HANDLED;
1200 }
1201
1202 static void ibmveth_set_multicast_list(struct net_device *netdev)
1203 {
1204 struct ibmveth_adapter *adapter = netdev_priv(netdev);
1205 unsigned long lpar_rc;
1206
1207 if ((netdev->flags & IFF_PROMISC) ||
1208 (netdev_mc_count(netdev) > adapter->mcastFilterSize)) {
1209 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1210 IbmVethMcastEnableRecv |
1211 IbmVethMcastDisableFiltering,
1212 0);
1213 if (lpar_rc != H_SUCCESS) {
1214 netdev_err(netdev, "h_multicast_ctrl rc=%ld when "
1215 "entering promisc mode\n", lpar_rc);
1216 }
1217 } else {
1218 struct netdev_hw_addr *ha;
1219 /* clear the filter table & disable filtering */
1220 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1221 IbmVethMcastEnableRecv |
1222 IbmVethMcastDisableFiltering |
1223 IbmVethMcastClearFilterTable,
1224 0);
1225 if (lpar_rc != H_SUCCESS) {
1226 netdev_err(netdev, "h_multicast_ctrl rc=%ld when "
1227 "attempting to clear filter table\n",
1228 lpar_rc);
1229 }
1230 /* add the addresses to the filter table */
1231 netdev_for_each_mc_addr(ha, netdev) {
1232 /* add the multicast address to the filter table */
1233 unsigned long mcast_addr = 0;
1234 memcpy(((char *)&mcast_addr)+2, ha->addr, 6);
1235 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1236 IbmVethMcastAddFilter,
1237 mcast_addr);
1238 if (lpar_rc != H_SUCCESS) {
1239 netdev_err(netdev, "h_multicast_ctrl rc=%ld "
1240 "when adding an entry to the filter "
1241 "table\n", lpar_rc);
1242 }
1243 }
1244
1245 /* re-enable filtering */
1246 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1247 IbmVethMcastEnableFiltering,
1248 0);
1249 if (lpar_rc != H_SUCCESS) {
1250 netdev_err(netdev, "h_multicast_ctrl rc=%ld when "
1251 "enabling filtering\n", lpar_rc);
1252 }
1253 }
1254 }
1255
1256 static int ibmveth_change_mtu(struct net_device *dev, int new_mtu)
1257 {
1258 struct ibmveth_adapter *adapter = netdev_priv(dev);
1259 struct vio_dev *viodev = adapter->vdev;
1260 int new_mtu_oh = new_mtu + IBMVETH_BUFF_OH;
1261 int i, rc;
1262 int need_restart = 0;
1263
1264 if (new_mtu < IBMVETH_MIN_MTU)
1265 return -EINVAL;
1266
1267 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
1268 if (new_mtu_oh < adapter->rx_buff_pool[i].buff_size)
1269 break;
1270
1271 if (i == IBMVETH_NUM_BUFF_POOLS)
1272 return -EINVAL;
1273
1274 /* Deactivate all the buffer pools so that the next loop can activate
1275 only the buffer pools necessary to hold the new MTU */
1276 if (netif_running(adapter->netdev)) {
1277 need_restart = 1;
1278 adapter->pool_config = 1;
1279 ibmveth_close(adapter->netdev);
1280 adapter->pool_config = 0;
1281 }
1282
1283 /* Look for an active buffer pool that can hold the new MTU */
1284 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1285 adapter->rx_buff_pool[i].active = 1;
1286
1287 if (new_mtu_oh < adapter->rx_buff_pool[i].buff_size) {
1288 dev->mtu = new_mtu;
1289 vio_cmo_set_dev_desired(viodev,
1290 ibmveth_get_desired_dma
1291 (viodev));
1292 if (need_restart) {
1293 return ibmveth_open(adapter->netdev);
1294 }
1295 return 0;
1296 }
1297 }
1298
1299 if (need_restart && (rc = ibmveth_open(adapter->netdev)))
1300 return rc;
1301
1302 return -EINVAL;
1303 }
1304
1305 #ifdef CONFIG_NET_POLL_CONTROLLER
1306 static void ibmveth_poll_controller(struct net_device *dev)
1307 {
1308 ibmveth_replenish_task(netdev_priv(dev));
1309 ibmveth_interrupt(dev->irq, dev);
1310 }
1311 #endif
1312
1313 /**
1314 * ibmveth_get_desired_dma - Calculate IO memory desired by the driver
1315 *
1316 * @vdev: struct vio_dev for the device whose desired IO mem is to be returned
1317 *
1318 * Return value:
1319 * Number of bytes of IO data the driver will need to perform well.
1320 */
1321 static unsigned long ibmveth_get_desired_dma(struct vio_dev *vdev)
1322 {
1323 struct net_device *netdev = dev_get_drvdata(&vdev->dev);
1324 struct ibmveth_adapter *adapter;
1325 unsigned long ret;
1326 int i;
1327 int rxqentries = 1;
1328
1329 /* netdev inits at probe time along with the structures we need below*/
1330 if (netdev == NULL)
1331 return IOMMU_PAGE_ALIGN(IBMVETH_IO_ENTITLEMENT_DEFAULT);
1332
1333 adapter = netdev_priv(netdev);
1334
1335 ret = IBMVETH_BUFF_LIST_SIZE + IBMVETH_FILT_LIST_SIZE;
1336 ret += IOMMU_PAGE_ALIGN(netdev->mtu);
1337
1338 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1339 /* add the size of the active receive buffers */
1340 if (adapter->rx_buff_pool[i].active)
1341 ret +=
1342 adapter->rx_buff_pool[i].size *
1343 IOMMU_PAGE_ALIGN(adapter->rx_buff_pool[i].
1344 buff_size);
1345 rxqentries += adapter->rx_buff_pool[i].size;
1346 }
1347 /* add the size of the receive queue entries */
1348 ret += IOMMU_PAGE_ALIGN(rxqentries * sizeof(struct ibmveth_rx_q_entry));
1349
1350 return ret;
1351 }
1352
1353 static const struct net_device_ops ibmveth_netdev_ops = {
1354 .ndo_open = ibmveth_open,
1355 .ndo_stop = ibmveth_close,
1356 .ndo_start_xmit = ibmveth_start_xmit,
1357 .ndo_set_multicast_list = ibmveth_set_multicast_list,
1358 .ndo_do_ioctl = ibmveth_ioctl,
1359 .ndo_change_mtu = ibmveth_change_mtu,
1360 .ndo_validate_addr = eth_validate_addr,
1361 .ndo_set_mac_address = eth_mac_addr,
1362 #ifdef CONFIG_NET_POLL_CONTROLLER
1363 .ndo_poll_controller = ibmveth_poll_controller,
1364 #endif
1365 };
1366
1367 static int __devinit ibmveth_probe(struct vio_dev *dev,
1368 const struct vio_device_id *id)
1369 {
1370 int rc, i;
1371 struct net_device *netdev;
1372 struct ibmveth_adapter *adapter;
1373 unsigned char *mac_addr_p;
1374 unsigned int *mcastFilterSize_p;
1375
1376 dev_dbg(&dev->dev, "entering ibmveth_probe for UA 0x%x\n",
1377 dev->unit_address);
1378
1379 mac_addr_p = (unsigned char *)vio_get_attribute(dev, VETH_MAC_ADDR,
1380 NULL);
1381 if (!mac_addr_p) {
1382 dev_err(&dev->dev, "Can't find VETH_MAC_ADDR attribute\n");
1383 return -EINVAL;
1384 }
1385
1386 mcastFilterSize_p = (unsigned int *)vio_get_attribute(dev,
1387 VETH_MCAST_FILTER_SIZE, NULL);
1388 if (!mcastFilterSize_p) {
1389 dev_err(&dev->dev, "Can't find VETH_MCAST_FILTER_SIZE "
1390 "attribute\n");
1391 return -EINVAL;
1392 }
1393
1394 netdev = alloc_etherdev(sizeof(struct ibmveth_adapter));
1395
1396 if (!netdev)
1397 return -ENOMEM;
1398
1399 adapter = netdev_priv(netdev);
1400 dev_set_drvdata(&dev->dev, netdev);
1401
1402 adapter->vdev = dev;
1403 adapter->netdev = netdev;
1404 adapter->mcastFilterSize = *mcastFilterSize_p;
1405 adapter->pool_config = 0;
1406
1407 netif_napi_add(netdev, &adapter->napi, ibmveth_poll, 16);
1408
1409 /*
1410 * Some older boxes running PHYP non-natively have an OF that returns
1411 * a 8-byte local-mac-address field (and the first 2 bytes have to be
1412 * ignored) while newer boxes' OF return a 6-byte field. Note that
1413 * IEEE 1275 specifies that local-mac-address must be a 6-byte field.
1414 * The RPA doc specifies that the first byte must be 10b, so we'll
1415 * just look for it to solve this 8 vs. 6 byte field issue
1416 */
1417 if ((*mac_addr_p & 0x3) != 0x02)
1418 mac_addr_p += 2;
1419
1420 adapter->mac_addr = 0;
1421 memcpy(&adapter->mac_addr, mac_addr_p, 6);
1422
1423 netdev->irq = dev->irq;
1424 netdev->netdev_ops = &ibmveth_netdev_ops;
1425 netdev->ethtool_ops = &netdev_ethtool_ops;
1426 SET_NETDEV_DEV(netdev, &dev->dev);
1427 netdev->features |= NETIF_F_SG;
1428
1429 memcpy(netdev->dev_addr, &adapter->mac_addr, netdev->addr_len);
1430
1431 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1432 struct kobject *kobj = &adapter->rx_buff_pool[i].kobj;
1433 int error;
1434
1435 ibmveth_init_buffer_pool(&adapter->rx_buff_pool[i], i,
1436 pool_count[i], pool_size[i],
1437 pool_active[i]);
1438 error = kobject_init_and_add(kobj, &ktype_veth_pool,
1439 &dev->dev.kobj, "pool%d", i);
1440 if (!error)
1441 kobject_uevent(kobj, KOBJ_ADD);
1442 }
1443
1444 netdev_dbg(netdev, "adapter @ 0x%p\n", adapter);
1445
1446 adapter->buffer_list_dma = DMA_ERROR_CODE;
1447 adapter->filter_list_dma = DMA_ERROR_CODE;
1448 adapter->rx_queue.queue_dma = DMA_ERROR_CODE;
1449
1450 netdev_dbg(netdev, "registering netdev...\n");
1451
1452 ibmveth_set_csum_offload(netdev, 1, ibmveth_set_tx_csum_flags);
1453
1454 rc = register_netdev(netdev);
1455
1456 if (rc) {
1457 netdev_dbg(netdev, "failed to register netdev rc=%d\n", rc);
1458 free_netdev(netdev);
1459 return rc;
1460 }
1461
1462 netdev_dbg(netdev, "registered\n");
1463
1464 return 0;
1465 }
1466
1467 static int __devexit ibmveth_remove(struct vio_dev *dev)
1468 {
1469 struct net_device *netdev = dev_get_drvdata(&dev->dev);
1470 struct ibmveth_adapter *adapter = netdev_priv(netdev);
1471 int i;
1472
1473 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
1474 kobject_put(&adapter->rx_buff_pool[i].kobj);
1475
1476 unregister_netdev(netdev);
1477
1478 free_netdev(netdev);
1479 dev_set_drvdata(&dev->dev, NULL);
1480
1481 return 0;
1482 }
1483
1484 static struct attribute veth_active_attr;
1485 static struct attribute veth_num_attr;
1486 static struct attribute veth_size_attr;
1487
1488 static ssize_t veth_pool_show(struct kobject *kobj,
1489 struct attribute *attr, char *buf)
1490 {
1491 struct ibmveth_buff_pool *pool = container_of(kobj,
1492 struct ibmveth_buff_pool,
1493 kobj);
1494
1495 if (attr == &veth_active_attr)
1496 return sprintf(buf, "%d\n", pool->active);
1497 else if (attr == &veth_num_attr)
1498 return sprintf(buf, "%d\n", pool->size);
1499 else if (attr == &veth_size_attr)
1500 return sprintf(buf, "%d\n", pool->buff_size);
1501 return 0;
1502 }
1503
1504 static ssize_t veth_pool_store(struct kobject *kobj, struct attribute *attr,
1505 const char *buf, size_t count)
1506 {
1507 struct ibmveth_buff_pool *pool = container_of(kobj,
1508 struct ibmveth_buff_pool,
1509 kobj);
1510 struct net_device *netdev = dev_get_drvdata(
1511 container_of(kobj->parent, struct device, kobj));
1512 struct ibmveth_adapter *adapter = netdev_priv(netdev);
1513 long value = simple_strtol(buf, NULL, 10);
1514 long rc;
1515
1516 if (attr == &veth_active_attr) {
1517 if (value && !pool->active) {
1518 if (netif_running(netdev)) {
1519 if (ibmveth_alloc_buffer_pool(pool)) {
1520 netdev_err(netdev,
1521 "unable to alloc pool\n");
1522 return -ENOMEM;
1523 }
1524 pool->active = 1;
1525 adapter->pool_config = 1;
1526 ibmveth_close(netdev);
1527 adapter->pool_config = 0;
1528 if ((rc = ibmveth_open(netdev)))
1529 return rc;
1530 } else {
1531 pool->active = 1;
1532 }
1533 } else if (!value && pool->active) {
1534 int mtu = netdev->mtu + IBMVETH_BUFF_OH;
1535 int i;
1536 /* Make sure there is a buffer pool with buffers that
1537 can hold a packet of the size of the MTU */
1538 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1539 if (pool == &adapter->rx_buff_pool[i])
1540 continue;
1541 if (!adapter->rx_buff_pool[i].active)
1542 continue;
1543 if (mtu <= adapter->rx_buff_pool[i].buff_size)
1544 break;
1545 }
1546
1547 if (i == IBMVETH_NUM_BUFF_POOLS) {
1548 netdev_err(netdev, "no active pool >= MTU\n");
1549 return -EPERM;
1550 }
1551
1552 if (netif_running(netdev)) {
1553 adapter->pool_config = 1;
1554 ibmveth_close(netdev);
1555 pool->active = 0;
1556 adapter->pool_config = 0;
1557 if ((rc = ibmveth_open(netdev)))
1558 return rc;
1559 }
1560 pool->active = 0;
1561 }
1562 } else if (attr == &veth_num_attr) {
1563 if (value <= 0 || value > IBMVETH_MAX_POOL_COUNT) {
1564 return -EINVAL;
1565 } else {
1566 if (netif_running(netdev)) {
1567 adapter->pool_config = 1;
1568 ibmveth_close(netdev);
1569 adapter->pool_config = 0;
1570 pool->size = value;
1571 if ((rc = ibmveth_open(netdev)))
1572 return rc;
1573 } else {
1574 pool->size = value;
1575 }
1576 }
1577 } else if (attr == &veth_size_attr) {
1578 if (value <= IBMVETH_BUFF_OH || value > IBMVETH_MAX_BUF_SIZE) {
1579 return -EINVAL;
1580 } else {
1581 if (netif_running(netdev)) {
1582 adapter->pool_config = 1;
1583 ibmveth_close(netdev);
1584 adapter->pool_config = 0;
1585 pool->buff_size = value;
1586 if ((rc = ibmveth_open(netdev)))
1587 return rc;
1588 } else {
1589 pool->buff_size = value;
1590 }
1591 }
1592 }
1593
1594 /* kick the interrupt handler to allocate/deallocate pools */
1595 ibmveth_interrupt(netdev->irq, netdev);
1596 return count;
1597 }
1598
1599
1600 #define ATTR(_name, _mode) \
1601 struct attribute veth_##_name##_attr = { \
1602 .name = __stringify(_name), .mode = _mode, \
1603 };
1604
1605 static ATTR(active, 0644);
1606 static ATTR(num, 0644);
1607 static ATTR(size, 0644);
1608
1609 static struct attribute *veth_pool_attrs[] = {
1610 &veth_active_attr,
1611 &veth_num_attr,
1612 &veth_size_attr,
1613 NULL,
1614 };
1615
1616 static const struct sysfs_ops veth_pool_ops = {
1617 .show = veth_pool_show,
1618 .store = veth_pool_store,
1619 };
1620
1621 static struct kobj_type ktype_veth_pool = {
1622 .release = NULL,
1623 .sysfs_ops = &veth_pool_ops,
1624 .default_attrs = veth_pool_attrs,
1625 };
1626
1627 static int ibmveth_resume(struct device *dev)
1628 {
1629 struct net_device *netdev = dev_get_drvdata(dev);
1630 ibmveth_interrupt(netdev->irq, netdev);
1631 return 0;
1632 }
1633
1634 static struct vio_device_id ibmveth_device_table[] __devinitdata = {
1635 { "network", "IBM,l-lan"},
1636 { "", "" }
1637 };
1638 MODULE_DEVICE_TABLE(vio, ibmveth_device_table);
1639
1640 static struct dev_pm_ops ibmveth_pm_ops = {
1641 .resume = ibmveth_resume
1642 };
1643
1644 static struct vio_driver ibmveth_driver = {
1645 .id_table = ibmveth_device_table,
1646 .probe = ibmveth_probe,
1647 .remove = ibmveth_remove,
1648 .get_desired_dma = ibmveth_get_desired_dma,
1649 .driver = {
1650 .name = ibmveth_driver_name,
1651 .owner = THIS_MODULE,
1652 .pm = &ibmveth_pm_ops,
1653 }
1654 };
1655
1656 static int __init ibmveth_module_init(void)
1657 {
1658 printk(KERN_DEBUG "%s: %s %s\n", ibmveth_driver_name,
1659 ibmveth_driver_string, ibmveth_driver_version);
1660
1661 return vio_register_driver(&ibmveth_driver);
1662 }
1663
1664 static void __exit ibmveth_module_exit(void)
1665 {
1666 vio_unregister_driver(&ibmveth_driver);
1667 }
1668
1669 module_init(ibmveth_module_init);
1670 module_exit(ibmveth_module_exit);
Linux kernel - Deliverables
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