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ibmveth: Some formatting fixes
[deliverable/linux.git] / drivers / net / ibmveth.c
1 /**************************************************************************/
2 /* */
3 /* IBM eServer i/pSeries Virtual Ethernet Device Driver */
4 /* Copyright (C) 2003 IBM Corp. */
5 /* Originally written by Dave Larson (larson1@us.ibm.com) */
6 /* Maintained by Santiago Leon (santil@us.ibm.com) */
7 /* */
8 /* This program is free software; you can redistribute it and/or modify */
9 /* it under the terms of the GNU General Public License as published by */
10 /* the Free Software Foundation; either version 2 of the License, or */
11 /* (at your option) any later version. */
12 /* */
13 /* This program is distributed in the hope that it will be useful, */
14 /* but WITHOUT ANY WARRANTY; without even the implied warranty of */
15 /* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the */
16 /* GNU General Public License for more details. */
17 /* */
18 /* You should have received a copy of the GNU General Public License */
19 /* along with this program; if not, write to the Free Software */
20 /* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 */
21 /* USA */
22 /* */
23 /* This module contains the implementation of a virtual ethernet device */
24 /* for use with IBM i/pSeries LPAR Linux. It utilizes the logical LAN */
25 /* option of the RS/6000 Platform Architechture to interface with virtual */
26 /* ethernet NICs that are presented to the partition by the hypervisor. */
27 /* */
28 /**************************************************************************/
29
30 #include <linux/module.h>
31 #include <linux/moduleparam.h>
32 #include <linux/types.h>
33 #include <linux/errno.h>
34 #include <linux/ioport.h>
35 #include <linux/dma-mapping.h>
36 #include <linux/kernel.h>
37 #include <linux/netdevice.h>
38 #include <linux/etherdevice.h>
39 #include <linux/skbuff.h>
40 #include <linux/init.h>
41 #include <linux/delay.h>
42 #include <linux/mm.h>
43 #include <linux/pm.h>
44 #include <linux/ethtool.h>
45 #include <linux/in.h>
46 #include <linux/ip.h>
47 #include <linux/ipv6.h>
48 #include <linux/slab.h>
49 #include <asm/hvcall.h>
50 #include <asm/atomic.h>
51 #include <asm/vio.h>
52 #include <asm/iommu.h>
53 #include <asm/uaccess.h>
54 #include <asm/firmware.h>
55
56 #include "ibmveth.h"
57
58 #undef DEBUG
59
60 #ifdef DEBUG
61 #define ibmveth_assert(expr) \
62 if(!(expr)) { \
63 printk(KERN_DEBUG "assertion failed (%s:%3.3d ua:%x): %s\n", __FILE__, __LINE__, adapter->vdev->unit_address, #expr); \
64 BUG(); \
65 }
66 #else
67 #define ibmveth_assert(expr)
68 #endif
69
70 static irqreturn_t ibmveth_interrupt(int irq, void *dev_instance);
71 static void ibmveth_rxq_harvest_buffer(struct ibmveth_adapter *adapter);
72 static unsigned long ibmveth_get_desired_dma(struct vio_dev *vdev);
73
74 static struct kobj_type ktype_veth_pool;
75
76
77 static const char ibmveth_driver_name[] = "ibmveth";
78 static const char ibmveth_driver_string[] = "IBM i/pSeries Virtual Ethernet Driver";
79 #define ibmveth_driver_version "1.03"
80
81 MODULE_AUTHOR("Santiago Leon <santil@us.ibm.com>");
82 MODULE_DESCRIPTION("IBM i/pSeries Virtual Ethernet Driver");
83 MODULE_LICENSE("GPL");
84 MODULE_VERSION(ibmveth_driver_version);
85
86 static unsigned int tx_copybreak __read_mostly = 128;
87 module_param(tx_copybreak, uint, 0644);
88 MODULE_PARM_DESC(tx_copybreak,
89 "Maximum size of packet that is copied to a new buffer on transmit");
90
91 static unsigned int rx_copybreak __read_mostly = 128;
92 module_param(rx_copybreak, uint, 0644);
93 MODULE_PARM_DESC(rx_copybreak,
94 "Maximum size of packet that is copied to a new buffer on receive");
95
96 static unsigned int rx_flush __read_mostly = 0;
97 module_param(rx_flush, uint, 0644);
98 MODULE_PARM_DESC(rx_flush, "Flush receive buffers before use");
99
100 struct ibmveth_stat {
101 char name[ETH_GSTRING_LEN];
102 int offset;
103 };
104
105 #define IBMVETH_STAT_OFF(stat) offsetof(struct ibmveth_adapter, stat)
106 #define IBMVETH_GET_STAT(a, off) *((u64 *)(((unsigned long)(a)) + off))
107
108 struct ibmveth_stat ibmveth_stats[] = {
109 { "replenish_task_cycles", IBMVETH_STAT_OFF(replenish_task_cycles) },
110 { "replenish_no_mem", IBMVETH_STAT_OFF(replenish_no_mem) },
111 { "replenish_add_buff_failure", IBMVETH_STAT_OFF(replenish_add_buff_failure) },
112 { "replenish_add_buff_success", IBMVETH_STAT_OFF(replenish_add_buff_success) },
113 { "rx_invalid_buffer", IBMVETH_STAT_OFF(rx_invalid_buffer) },
114 { "rx_no_buffer", IBMVETH_STAT_OFF(rx_no_buffer) },
115 { "tx_map_failed", IBMVETH_STAT_OFF(tx_map_failed) },
116 { "tx_send_failed", IBMVETH_STAT_OFF(tx_send_failed) },
117 { "fw_enabled_ipv4_csum", IBMVETH_STAT_OFF(fw_ipv4_csum_support) },
118 { "fw_enabled_ipv6_csum", IBMVETH_STAT_OFF(fw_ipv6_csum_support) },
119 };
120
121 /* simple methods of getting data from the current rxq entry */
122 static inline u32 ibmveth_rxq_flags(struct ibmveth_adapter *adapter)
123 {
124 return adapter->rx_queue.queue_addr[adapter->rx_queue.index].flags_off;
125 }
126
127 static inline int ibmveth_rxq_toggle(struct ibmveth_adapter *adapter)
128 {
129 return (ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_TOGGLE) >> IBMVETH_RXQ_TOGGLE_SHIFT;
130 }
131
132 static inline int ibmveth_rxq_pending_buffer(struct ibmveth_adapter *adapter)
133 {
134 return (ibmveth_rxq_toggle(adapter) == adapter->rx_queue.toggle);
135 }
136
137 static inline int ibmveth_rxq_buffer_valid(struct ibmveth_adapter *adapter)
138 {
139 return (ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_VALID);
140 }
141
142 static inline int ibmveth_rxq_frame_offset(struct ibmveth_adapter *adapter)
143 {
144 return (ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_OFF_MASK);
145 }
146
147 static inline int ibmveth_rxq_frame_length(struct ibmveth_adapter *adapter)
148 {
149 return (adapter->rx_queue.queue_addr[adapter->rx_queue.index].length);
150 }
151
152 static inline int ibmveth_rxq_csum_good(struct ibmveth_adapter *adapter)
153 {
154 return (ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_CSUM_GOOD);
155 }
156
157 /* setup the initial settings for a buffer pool */
158 static void ibmveth_init_buffer_pool(struct ibmveth_buff_pool *pool, u32 pool_index, u32 pool_size, u32 buff_size, u32 pool_active)
159 {
160 pool->size = pool_size;
161 pool->index = pool_index;
162 pool->buff_size = buff_size;
163 pool->threshold = pool_size * 7 / 8;
164 pool->active = pool_active;
165 }
166
167 /* allocate and setup an buffer pool - called during open */
168 static int ibmveth_alloc_buffer_pool(struct ibmveth_buff_pool *pool)
169 {
170 int i;
171
172 pool->free_map = kmalloc(sizeof(u16) * pool->size, GFP_KERNEL);
173
174 if(!pool->free_map) {
175 return -1;
176 }
177
178 pool->dma_addr = kmalloc(sizeof(dma_addr_t) * pool->size, GFP_KERNEL);
179 if(!pool->dma_addr) {
180 kfree(pool->free_map);
181 pool->free_map = NULL;
182 return -1;
183 }
184
185 pool->skbuff = kcalloc(pool->size, sizeof(void *), GFP_KERNEL);
186
187 if(!pool->skbuff) {
188 kfree(pool->dma_addr);
189 pool->dma_addr = NULL;
190
191 kfree(pool->free_map);
192 pool->free_map = NULL;
193 return -1;
194 }
195
196 memset(pool->dma_addr, 0, sizeof(dma_addr_t) * pool->size);
197
198 for(i = 0; i < pool->size; ++i) {
199 pool->free_map[i] = i;
200 }
201
202 atomic_set(&pool->available, 0);
203 pool->producer_index = 0;
204 pool->consumer_index = 0;
205
206 return 0;
207 }
208
209 static inline void ibmveth_flush_buffer(void *addr, unsigned long length)
210 {
211 unsigned long offset;
212
213 for (offset = 0; offset < length; offset += SMP_CACHE_BYTES)
214 asm("dcbfl %0,%1" :: "b" (addr), "r" (offset));
215 }
216
217 /* replenish the buffers for a pool. note that we don't need to
218 * skb_reserve these since they are used for incoming...
219 */
220 static void ibmveth_replenish_buffer_pool(struct ibmveth_adapter *adapter, struct ibmveth_buff_pool *pool)
221 {
222 u32 i;
223 u32 count = pool->size - atomic_read(&pool->available);
224 u32 buffers_added = 0;
225 struct sk_buff *skb;
226 unsigned int free_index, index;
227 u64 correlator;
228 unsigned long lpar_rc;
229 dma_addr_t dma_addr;
230
231 mb();
232
233 for(i = 0; i < count; ++i) {
234 union ibmveth_buf_desc desc;
235
236 skb = netdev_alloc_skb(adapter->netdev, pool->buff_size);
237
238 if(!skb) {
239 netdev_dbg(adapter->netdev,
240 "replenish: unable to allocate skb\n");
241 adapter->replenish_no_mem++;
242 break;
243 }
244
245 free_index = pool->consumer_index;
246 pool->consumer_index++;
247 if (pool->consumer_index >= pool->size)
248 pool->consumer_index = 0;
249 index = pool->free_map[free_index];
250
251 ibmveth_assert(index != IBM_VETH_INVALID_MAP);
252 ibmveth_assert(pool->skbuff[index] == NULL);
253
254 dma_addr = dma_map_single(&adapter->vdev->dev, skb->data,
255 pool->buff_size, DMA_FROM_DEVICE);
256
257 if (dma_mapping_error(&adapter->vdev->dev, dma_addr))
258 goto failure;
259
260 pool->free_map[free_index] = IBM_VETH_INVALID_MAP;
261 pool->dma_addr[index] = dma_addr;
262 pool->skbuff[index] = skb;
263
264 correlator = ((u64)pool->index << 32) | index;
265 *(u64*)skb->data = correlator;
266
267 desc.fields.flags_len = IBMVETH_BUF_VALID | pool->buff_size;
268 desc.fields.address = dma_addr;
269
270 if (rx_flush) {
271 unsigned int len = min(pool->buff_size,
272 adapter->netdev->mtu +
273 IBMVETH_BUFF_OH);
274 ibmveth_flush_buffer(skb->data, len);
275 }
276 lpar_rc = h_add_logical_lan_buffer(adapter->vdev->unit_address, desc.desc);
277
278 if (lpar_rc != H_SUCCESS)
279 goto failure;
280 else {
281 buffers_added++;
282 adapter->replenish_add_buff_success++;
283 }
284 }
285
286 mb();
287 atomic_add(buffers_added, &(pool->available));
288 return;
289
290 failure:
291 pool->free_map[free_index] = index;
292 pool->skbuff[index] = NULL;
293 if (pool->consumer_index == 0)
294 pool->consumer_index = pool->size - 1;
295 else
296 pool->consumer_index--;
297 if (!dma_mapping_error(&adapter->vdev->dev, dma_addr))
298 dma_unmap_single(&adapter->vdev->dev,
299 pool->dma_addr[index], pool->buff_size,
300 DMA_FROM_DEVICE);
301 dev_kfree_skb_any(skb);
302 adapter->replenish_add_buff_failure++;
303
304 mb();
305 atomic_add(buffers_added, &(pool->available));
306 }
307
308 /* replenish routine */
309 static void ibmveth_replenish_task(struct ibmveth_adapter *adapter)
310 {
311 int i;
312
313 adapter->replenish_task_cycles++;
314
315 for (i = (IBMVETH_NUM_BUFF_POOLS - 1); i >= 0; i--) {
316 struct ibmveth_buff_pool *pool = &adapter->rx_buff_pool[i];
317
318 if (pool->active &&
319 (atomic_read(&pool->available) < pool->threshold))
320 ibmveth_replenish_buffer_pool(adapter, pool);
321 }
322
323 adapter->rx_no_buffer = *(u64*)(((char*)adapter->buffer_list_addr) + 4096 - 8);
324 }
325
326 /* empty and free ana buffer pool - also used to do cleanup in error paths */
327 static void ibmveth_free_buffer_pool(struct ibmveth_adapter *adapter, 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, u64 correlator)
361 {
362 unsigned int pool = correlator >> 32;
363 unsigned int index = correlator & 0xffffffffUL;
364 unsigned int free_index;
365 struct sk_buff *skb;
366
367 ibmveth_assert(pool < IBMVETH_NUM_BUFF_POOLS);
368 ibmveth_assert(index < adapter->rx_buff_pool[pool].size);
369
370 skb = adapter->rx_buff_pool[pool].skbuff[index];
371
372 ibmveth_assert(skb != NULL);
373
374 adapter->rx_buff_pool[pool].skbuff[index] = NULL;
375
376 dma_unmap_single(&adapter->vdev->dev,
377 adapter->rx_buff_pool[pool].dma_addr[index],
378 adapter->rx_buff_pool[pool].buff_size,
379 DMA_FROM_DEVICE);
380
381 free_index = adapter->rx_buff_pool[pool].producer_index;
382 adapter->rx_buff_pool[pool].producer_index++;
383 if (adapter->rx_buff_pool[pool].producer_index >=
384 adapter->rx_buff_pool[pool].size)
385 adapter->rx_buff_pool[pool].producer_index = 0;
386 adapter->rx_buff_pool[pool].free_map[free_index] = index;
387
388 mb();
389
390 atomic_dec(&(adapter->rx_buff_pool[pool].available));
391 }
392
393 /* get the current buffer on the rx queue */
394 static inline struct sk_buff *ibmveth_rxq_get_buffer(struct ibmveth_adapter *adapter)
395 {
396 u64 correlator = adapter->rx_queue.queue_addr[adapter->rx_queue.index].correlator;
397 unsigned int pool = correlator >> 32;
398 unsigned int index = correlator & 0xffffffffUL;
399
400 ibmveth_assert(pool < IBMVETH_NUM_BUFF_POOLS);
401 ibmveth_assert(index < adapter->rx_buff_pool[pool].size);
402
403 return adapter->rx_buff_pool[pool].skbuff[index];
404 }
405
406 /* recycle the current buffer on the rx queue */
407 static void ibmveth_rxq_recycle_buffer(struct ibmveth_adapter *adapter)
408 {
409 u32 q_index = adapter->rx_queue.index;
410 u64 correlator = adapter->rx_queue.queue_addr[q_index].correlator;
411 unsigned int pool = correlator >> 32;
412 unsigned int index = correlator & 0xffffffffUL;
413 union ibmveth_buf_desc desc;
414 unsigned long lpar_rc;
415
416 ibmveth_assert(pool < IBMVETH_NUM_BUFF_POOLS);
417 ibmveth_assert(index < adapter->rx_buff_pool[pool].size);
418
419 if(!adapter->rx_buff_pool[pool].active) {
420 ibmveth_rxq_harvest_buffer(adapter);
421 ibmveth_free_buffer_pool(adapter, &adapter->rx_buff_pool[pool]);
422 return;
423 }
424
425 desc.fields.flags_len = IBMVETH_BUF_VALID |
426 adapter->rx_buff_pool[pool].buff_size;
427 desc.fields.address = adapter->rx_buff_pool[pool].dma_addr[index];
428
429 lpar_rc = h_add_logical_lan_buffer(adapter->vdev->unit_address, desc.desc);
430
431 if(lpar_rc != H_SUCCESS) {
432 netdev_dbg(adapter->netdev, "h_add_logical_lan_buffer failed "
433 "during recycle rc=%ld", lpar_rc);
434 ibmveth_remove_buffer_from_pool(adapter, adapter->rx_queue.queue_addr[adapter->rx_queue.index].correlator);
435 }
436
437 if(++adapter->rx_queue.index == adapter->rx_queue.num_slots) {
438 adapter->rx_queue.index = 0;
439 adapter->rx_queue.toggle = !adapter->rx_queue.toggle;
440 }
441 }
442
443 static void ibmveth_rxq_harvest_buffer(struct ibmveth_adapter *adapter)
444 {
445 ibmveth_remove_buffer_from_pool(adapter, adapter->rx_queue.queue_addr[adapter->rx_queue.index].correlator);
446
447 if(++adapter->rx_queue.index == adapter->rx_queue.num_slots) {
448 adapter->rx_queue.index = 0;
449 adapter->rx_queue.toggle = !adapter->rx_queue.toggle;
450 }
451 }
452
453 static void ibmveth_cleanup(struct ibmveth_adapter *adapter)
454 {
455 int i;
456 struct device *dev = &adapter->vdev->dev;
457
458 if(adapter->buffer_list_addr != NULL) {
459 if (!dma_mapping_error(dev, adapter->buffer_list_dma)) {
460 dma_unmap_single(dev, adapter->buffer_list_dma, 4096,
461 DMA_BIDIRECTIONAL);
462 adapter->buffer_list_dma = DMA_ERROR_CODE;
463 }
464 free_page((unsigned long)adapter->buffer_list_addr);
465 adapter->buffer_list_addr = NULL;
466 }
467
468 if(adapter->filter_list_addr != NULL) {
469 if (!dma_mapping_error(dev, adapter->filter_list_dma)) {
470 dma_unmap_single(dev, adapter->filter_list_dma, 4096,
471 DMA_BIDIRECTIONAL);
472 adapter->filter_list_dma = DMA_ERROR_CODE;
473 }
474 free_page((unsigned long)adapter->filter_list_addr);
475 adapter->filter_list_addr = NULL;
476 }
477
478 if(adapter->rx_queue.queue_addr != NULL) {
479 if (!dma_mapping_error(dev, adapter->rx_queue.queue_dma)) {
480 dma_unmap_single(dev,
481 adapter->rx_queue.queue_dma,
482 adapter->rx_queue.queue_len,
483 DMA_BIDIRECTIONAL);
484 adapter->rx_queue.queue_dma = DMA_ERROR_CODE;
485 }
486 kfree(adapter->rx_queue.queue_addr);
487 adapter->rx_queue.queue_addr = NULL;
488 }
489
490 for(i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
491 if (adapter->rx_buff_pool[i].active)
492 ibmveth_free_buffer_pool(adapter,
493 &adapter->rx_buff_pool[i]);
494
495 if (adapter->bounce_buffer != NULL) {
496 if (!dma_mapping_error(dev, adapter->bounce_buffer_dma)) {
497 dma_unmap_single(&adapter->vdev->dev,
498 adapter->bounce_buffer_dma,
499 adapter->netdev->mtu + IBMVETH_BUFF_OH,
500 DMA_BIDIRECTIONAL);
501 adapter->bounce_buffer_dma = DMA_ERROR_CODE;
502 }
503 kfree(adapter->bounce_buffer);
504 adapter->bounce_buffer = NULL;
505 }
506 }
507
508 static int ibmveth_register_logical_lan(struct ibmveth_adapter *adapter,
509 union ibmveth_buf_desc rxq_desc, u64 mac_address)
510 {
511 int rc, try_again = 1;
512
513 /* After a kexec the adapter will still be open, so our attempt to
514 * open it will fail. So if we get a failure we free the adapter and
515 * try again, but only once. */
516 retry:
517 rc = h_register_logical_lan(adapter->vdev->unit_address,
518 adapter->buffer_list_dma, rxq_desc.desc,
519 adapter->filter_list_dma, mac_address);
520
521 if (rc != H_SUCCESS && try_again) {
522 do {
523 rc = h_free_logical_lan(adapter->vdev->unit_address);
524 } while (H_IS_LONG_BUSY(rc) || (rc == H_BUSY));
525
526 try_again = 0;
527 goto retry;
528 }
529
530 return rc;
531 }
532
533 static int ibmveth_open(struct net_device *netdev)
534 {
535 struct ibmveth_adapter *adapter = netdev_priv(netdev);
536 u64 mac_address = 0;
537 int rxq_entries = 1;
538 unsigned long lpar_rc;
539 int rc;
540 union ibmveth_buf_desc rxq_desc;
541 int i;
542 struct device *dev;
543
544 netdev_dbg(netdev, "open starting\n");
545
546 napi_enable(&adapter->napi);
547
548 for(i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
549 rxq_entries += adapter->rx_buff_pool[i].size;
550
551 adapter->buffer_list_addr = (void*) get_zeroed_page(GFP_KERNEL);
552 adapter->filter_list_addr = (void*) get_zeroed_page(GFP_KERNEL);
553
554 if(!adapter->buffer_list_addr || !adapter->filter_list_addr) {
555 netdev_err(netdev, "unable to allocate filter or buffer list "
556 "pages\n");
557 ibmveth_cleanup(adapter);
558 napi_disable(&adapter->napi);
559 return -ENOMEM;
560 }
561
562 adapter->rx_queue.queue_len = sizeof(struct ibmveth_rx_q_entry) * rxq_entries;
563 adapter->rx_queue.queue_addr = kmalloc(adapter->rx_queue.queue_len, GFP_KERNEL);
564
565 if(!adapter->rx_queue.queue_addr) {
566 netdev_err(netdev, "unable to allocate rx queue pages\n");
567 ibmveth_cleanup(adapter);
568 napi_disable(&adapter->napi);
569 return -ENOMEM;
570 }
571
572 dev = &adapter->vdev->dev;
573
574 adapter->buffer_list_dma = dma_map_single(dev,
575 adapter->buffer_list_addr, 4096, DMA_BIDIRECTIONAL);
576 adapter->filter_list_dma = dma_map_single(dev,
577 adapter->filter_list_addr, 4096, DMA_BIDIRECTIONAL);
578 adapter->rx_queue.queue_dma = dma_map_single(dev,
579 adapter->rx_queue.queue_addr,
580 adapter->rx_queue.queue_len, DMA_BIDIRECTIONAL);
581
582 if ((dma_mapping_error(dev, adapter->buffer_list_dma)) ||
583 (dma_mapping_error(dev, adapter->filter_list_dma)) ||
584 (dma_mapping_error(dev, adapter->rx_queue.queue_dma))) {
585 netdev_err(netdev, "unable to map filter or buffer list "
586 "pages\n");
587 ibmveth_cleanup(adapter);
588 napi_disable(&adapter->napi);
589 return -ENOMEM;
590 }
591
592 adapter->rx_queue.index = 0;
593 adapter->rx_queue.num_slots = rxq_entries;
594 adapter->rx_queue.toggle = 1;
595
596 memcpy(&mac_address, netdev->dev_addr, netdev->addr_len);
597 mac_address = mac_address >> 16;
598
599 rxq_desc.fields.flags_len = IBMVETH_BUF_VALID | 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 if((rc = request_irq(netdev->irq, ibmveth_interrupt, 0, netdev->name, netdev)) != 0) {
638 netdev_err(netdev, "unable to request irq 0x%x, rc %d\n",
639 netdev->irq, rc);
640 do {
641 rc = h_free_logical_lan(adapter->vdev->unit_address);
642 } while (H_IS_LONG_BUSY(rc) || (rc == H_BUSY));
643
644 ibmveth_cleanup(adapter);
645 napi_disable(&adapter->napi);
646 return rc;
647 }
648
649 adapter->bounce_buffer =
650 kmalloc(netdev->mtu + IBMVETH_BUFF_OH, GFP_KERNEL);
651 if (!adapter->bounce_buffer) {
652 netdev_err(netdev, "unable to allocate bounce buffer\n");
653 ibmveth_cleanup(adapter);
654 napi_disable(&adapter->napi);
655 return -ENOMEM;
656 }
657 adapter->bounce_buffer_dma =
658 dma_map_single(&adapter->vdev->dev, adapter->bounce_buffer,
659 netdev->mtu + IBMVETH_BUFF_OH, DMA_BIDIRECTIONAL);
660 if (dma_mapping_error(dev, adapter->bounce_buffer_dma)) {
661 netdev_err(netdev, "unable to map bounce buffer\n");
662 ibmveth_cleanup(adapter);
663 napi_disable(&adapter->napi);
664 return -ENOMEM;
665 }
666
667 netdev_dbg(netdev, "initial replenish cycle\n");
668 ibmveth_interrupt(netdev->irq, netdev);
669
670 netif_start_queue(netdev);
671
672 netdev_dbg(netdev, "open complete\n");
673
674 return 0;
675 }
676
677 static int ibmveth_close(struct net_device *netdev)
678 {
679 struct ibmveth_adapter *adapter = netdev_priv(netdev);
680 long lpar_rc;
681
682 netdev_dbg(netdev, "close starting\n");
683
684 napi_disable(&adapter->napi);
685
686 if (!adapter->pool_config)
687 netif_stop_queue(netdev);
688
689 h_vio_signal(adapter->vdev->unit_address, VIO_IRQ_DISABLE);
690
691 do {
692 lpar_rc = h_free_logical_lan(adapter->vdev->unit_address);
693 } while (H_IS_LONG_BUSY(lpar_rc) || (lpar_rc == H_BUSY));
694
695 if(lpar_rc != H_SUCCESS)
696 {
697 netdev_err(netdev, "h_free_logical_lan failed with %lx, "
698 "continuing with close\n", lpar_rc);
699 }
700
701 free_irq(netdev->irq, netdev);
702
703 adapter->rx_no_buffer = *(u64*)(((char*)adapter->buffer_list_addr) + 4096 - 8);
704
705 ibmveth_cleanup(adapter);
706
707 netdev_dbg(netdev, "close complete\n");
708
709 return 0;
710 }
711
712 static int netdev_get_settings(struct net_device *dev, struct ethtool_cmd *cmd) {
713 cmd->supported = (SUPPORTED_1000baseT_Full | SUPPORTED_Autoneg | SUPPORTED_FIBRE);
714 cmd->advertising = (ADVERTISED_1000baseT_Full | ADVERTISED_Autoneg | ADVERTISED_FIBRE);
715 cmd->speed = SPEED_1000;
716 cmd->duplex = DUPLEX_FULL;
717 cmd->port = PORT_FIBRE;
718 cmd->phy_address = 0;
719 cmd->transceiver = XCVR_INTERNAL;
720 cmd->autoneg = AUTONEG_ENABLE;
721 cmd->maxtxpkt = 0;
722 cmd->maxrxpkt = 1;
723 return 0;
724 }
725
726 static void netdev_get_drvinfo (struct net_device *dev, struct ethtool_drvinfo *info) {
727 strncpy(info->driver, ibmveth_driver_name, sizeof(info->driver) - 1);
728 strncpy(info->version, ibmveth_driver_version, sizeof(info->version) - 1);
729 }
730
731 static u32 netdev_get_link(struct net_device *dev) {
732 return 1;
733 }
734
735 static void ibmveth_set_rx_csum_flags(struct net_device *dev, u32 data)
736 {
737 struct ibmveth_adapter *adapter = netdev_priv(dev);
738
739 if (data)
740 adapter->rx_csum = 1;
741 else {
742 /*
743 * Since the ibmveth firmware interface does not have the concept of
744 * separate tx/rx checksum offload enable, if rx checksum is disabled
745 * we also have to disable tx checksum offload. Once we disable rx
746 * checksum offload, we are no longer allowed to send tx buffers that
747 * are not properly checksummed.
748 */
749 adapter->rx_csum = 0;
750 dev->features &= ~NETIF_F_IP_CSUM;
751 dev->features &= ~NETIF_F_IPV6_CSUM;
752 }
753 }
754
755 static void ibmveth_set_tx_csum_flags(struct net_device *dev, u32 data)
756 {
757 struct ibmveth_adapter *adapter = netdev_priv(dev);
758
759 if (data) {
760 if (adapter->fw_ipv4_csum_support)
761 dev->features |= NETIF_F_IP_CSUM;
762 if (adapter->fw_ipv6_csum_support)
763 dev->features |= NETIF_F_IPV6_CSUM;
764 adapter->rx_csum = 1;
765 } else {
766 dev->features &= ~NETIF_F_IP_CSUM;
767 dev->features &= ~NETIF_F_IPV6_CSUM;
768 }
769 }
770
771 static int ibmveth_set_csum_offload(struct net_device *dev, u32 data,
772 void (*done) (struct net_device *, u32))
773 {
774 struct ibmveth_adapter *adapter = netdev_priv(dev);
775 unsigned long set_attr, clr_attr, ret_attr;
776 unsigned long set_attr6, clr_attr6;
777 long ret, ret6;
778 int rc1 = 0, rc2 = 0;
779 int restart = 0;
780
781 if (netif_running(dev)) {
782 restart = 1;
783 adapter->pool_config = 1;
784 ibmveth_close(dev);
785 adapter->pool_config = 0;
786 }
787
788 set_attr = 0;
789 clr_attr = 0;
790
791 if (data) {
792 set_attr = IBMVETH_ILLAN_IPV4_TCP_CSUM;
793 set_attr6 = IBMVETH_ILLAN_IPV6_TCP_CSUM;
794 } else {
795 clr_attr = IBMVETH_ILLAN_IPV4_TCP_CSUM;
796 clr_attr6 = IBMVETH_ILLAN_IPV6_TCP_CSUM;
797 }
798
799 ret = h_illan_attributes(adapter->vdev->unit_address, 0, 0, &ret_attr);
800
801 if (ret == H_SUCCESS && !(ret_attr & IBMVETH_ILLAN_ACTIVE_TRUNK) &&
802 !(ret_attr & IBMVETH_ILLAN_TRUNK_PRI_MASK) &&
803 (ret_attr & IBMVETH_ILLAN_PADDED_PKT_CSUM)) {
804 ret = h_illan_attributes(adapter->vdev->unit_address, clr_attr,
805 set_attr, &ret_attr);
806
807 if (ret != H_SUCCESS) {
808 netdev_err(dev, "unable to change IPv4 checksum "
809 "offload settings. %d rc=%ld\n",
810 data, ret);
811
812 ret = h_illan_attributes(adapter->vdev->unit_address,
813 set_attr, clr_attr, &ret_attr);
814 } else
815 adapter->fw_ipv4_csum_support = data;
816
817 ret6 = h_illan_attributes(adapter->vdev->unit_address,
818 clr_attr6, set_attr6, &ret_attr);
819
820 if (ret6 != H_SUCCESS) {
821 netdev_err(dev, "unable to change IPv6 checksum "
822 "offload settings. %d rc=%ld\n",
823 data, ret);
824
825 ret = h_illan_attributes(adapter->vdev->unit_address,
826 set_attr6, clr_attr6,
827 &ret_attr);
828 } else
829 adapter->fw_ipv6_csum_support = data;
830
831 if (ret == H_SUCCESS || ret6 == H_SUCCESS)
832 done(dev, data);
833 else
834 rc1 = -EIO;
835 } else {
836 rc1 = -EIO;
837 netdev_err(dev, "unable to change checksum offload settings."
838 " %d rc=%ld ret_attr=%lx\n", data, ret,
839 ret_attr);
840 }
841
842 if (restart)
843 rc2 = ibmveth_open(dev);
844
845 return rc1 ? rc1 : rc2;
846 }
847
848 static int ibmveth_set_rx_csum(struct net_device *dev, u32 data)
849 {
850 struct ibmveth_adapter *adapter = netdev_priv(dev);
851
852 if ((data && adapter->rx_csum) || (!data && !adapter->rx_csum))
853 return 0;
854
855 return ibmveth_set_csum_offload(dev, data, ibmveth_set_rx_csum_flags);
856 }
857
858 static int ibmveth_set_tx_csum(struct net_device *dev, u32 data)
859 {
860 struct ibmveth_adapter *adapter = netdev_priv(dev);
861 int rc = 0;
862
863 if (data && (dev->features & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM)))
864 return 0;
865 if (!data && !(dev->features & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM)))
866 return 0;
867
868 if (data && !adapter->rx_csum)
869 rc = ibmveth_set_csum_offload(dev, data, ibmveth_set_tx_csum_flags);
870 else
871 ibmveth_set_tx_csum_flags(dev, data);
872
873 return rc;
874 }
875
876 static u32 ibmveth_get_rx_csum(struct net_device *dev)
877 {
878 struct ibmveth_adapter *adapter = netdev_priv(dev);
879 return adapter->rx_csum;
880 }
881
882 static void ibmveth_get_strings(struct net_device *dev, u32 stringset, u8 *data)
883 {
884 int i;
885
886 if (stringset != ETH_SS_STATS)
887 return;
888
889 for (i = 0; i < ARRAY_SIZE(ibmveth_stats); i++, data += ETH_GSTRING_LEN)
890 memcpy(data, ibmveth_stats[i].name, ETH_GSTRING_LEN);
891 }
892
893 static int ibmveth_get_sset_count(struct net_device *dev, int sset)
894 {
895 switch (sset) {
896 case ETH_SS_STATS:
897 return ARRAY_SIZE(ibmveth_stats);
898 default:
899 return -EOPNOTSUPP;
900 }
901 }
902
903 static void ibmveth_get_ethtool_stats(struct net_device *dev,
904 struct ethtool_stats *stats, u64 *data)
905 {
906 int i;
907 struct ibmveth_adapter *adapter = netdev_priv(dev);
908
909 for (i = 0; i < ARRAY_SIZE(ibmveth_stats); i++)
910 data[i] = IBMVETH_GET_STAT(adapter, ibmveth_stats[i].offset);
911 }
912
913 static const struct ethtool_ops netdev_ethtool_ops = {
914 .get_drvinfo = netdev_get_drvinfo,
915 .get_settings = netdev_get_settings,
916 .get_link = netdev_get_link,
917 .set_tx_csum = ibmveth_set_tx_csum,
918 .get_rx_csum = ibmveth_get_rx_csum,
919 .set_rx_csum = ibmveth_set_rx_csum,
920 .get_strings = ibmveth_get_strings,
921 .get_sset_count = ibmveth_get_sset_count,
922 .get_ethtool_stats = ibmveth_get_ethtool_stats,
923 .set_sg = ethtool_op_set_sg,
924 };
925
926 static int ibmveth_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
927 {
928 return -EOPNOTSUPP;
929 }
930
931 #define page_offset(v) ((unsigned long)(v) & ((1 << 12) - 1))
932
933 static int ibmveth_send(struct ibmveth_adapter *adapter,
934 union ibmveth_buf_desc *descs)
935 {
936 unsigned long correlator;
937 unsigned int retry_count;
938 unsigned long ret;
939
940 /*
941 * The retry count sets a maximum for the number of broadcast and
942 * multicast destinations within the system.
943 */
944 retry_count = 1024;
945 correlator = 0;
946 do {
947 ret = h_send_logical_lan(adapter->vdev->unit_address,
948 descs[0].desc, descs[1].desc,
949 descs[2].desc, descs[3].desc,
950 descs[4].desc, descs[5].desc,
951 correlator, &correlator);
952 } while ((ret == H_BUSY) && (retry_count--));
953
954 if (ret != H_SUCCESS && ret != H_DROPPED) {
955 netdev_err(adapter->netdev, "tx: h_send_logical_lan failed "
956 "with rc=%ld\n", ret);
957 return 1;
958 }
959
960 return 0;
961 }
962
963 static netdev_tx_t ibmveth_start_xmit(struct sk_buff *skb,
964 struct net_device *netdev)
965 {
966 struct ibmveth_adapter *adapter = netdev_priv(netdev);
967 unsigned int desc_flags;
968 union ibmveth_buf_desc descs[6];
969 int last, i;
970 int force_bounce = 0;
971
972 /*
973 * veth handles a maximum of 6 segments including the header, so
974 * we have to linearize the skb if there are more than this.
975 */
976 if (skb_shinfo(skb)->nr_frags > 5 && __skb_linearize(skb)) {
977 netdev->stats.tx_dropped++;
978 goto out;
979 }
980
981 /* veth can't checksum offload UDP */
982 if (skb->ip_summed == CHECKSUM_PARTIAL &&
983 ((skb->protocol == htons(ETH_P_IP) &&
984 ip_hdr(skb)->protocol != IPPROTO_TCP) ||
985 (skb->protocol == htons(ETH_P_IPV6) &&
986 ipv6_hdr(skb)->nexthdr != IPPROTO_TCP)) &&
987 skb_checksum_help(skb)) {
988
989 netdev_err(netdev, "tx: failed to checksum packet\n");
990 netdev->stats.tx_dropped++;
991 goto out;
992 }
993
994 desc_flags = IBMVETH_BUF_VALID;
995
996 if (skb->ip_summed == CHECKSUM_PARTIAL) {
997 unsigned char *buf = skb_transport_header(skb) +
998 skb->csum_offset;
999
1000 desc_flags |= (IBMVETH_BUF_NO_CSUM | IBMVETH_BUF_CSUM_GOOD);
1001
1002 /* Need to zero out the checksum */
1003 buf[0] = 0;
1004 buf[1] = 0;
1005 }
1006
1007 retry_bounce:
1008 memset(descs, 0, sizeof(descs));
1009
1010 /*
1011 * If a linear packet is below the rx threshold then
1012 * copy it into the static bounce buffer. This avoids the
1013 * cost of a TCE insert and remove.
1014 */
1015 if (force_bounce || (!skb_is_nonlinear(skb) &&
1016 (skb->len < tx_copybreak))) {
1017 skb_copy_from_linear_data(skb, adapter->bounce_buffer,
1018 skb->len);
1019
1020 descs[0].fields.flags_len = desc_flags | skb->len;
1021 descs[0].fields.address = adapter->bounce_buffer_dma;
1022
1023 if (ibmveth_send(adapter, descs)) {
1024 adapter->tx_send_failed++;
1025 netdev->stats.tx_dropped++;
1026 } else {
1027 netdev->stats.tx_packets++;
1028 netdev->stats.tx_bytes += skb->len;
1029 }
1030
1031 goto out;
1032 }
1033
1034 /* Map the header */
1035 descs[0].fields.address = dma_map_single(&adapter->vdev->dev, skb->data,
1036 skb_headlen(skb),
1037 DMA_TO_DEVICE);
1038 if (dma_mapping_error(&adapter->vdev->dev, descs[0].fields.address))
1039 goto map_failed;
1040
1041 descs[0].fields.flags_len = desc_flags | skb_headlen(skb);
1042
1043 /* Map the frags */
1044 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1045 unsigned long dma_addr;
1046 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1047
1048 dma_addr = dma_map_page(&adapter->vdev->dev, frag->page,
1049 frag->page_offset, frag->size,
1050 DMA_TO_DEVICE);
1051
1052 if (dma_mapping_error(&adapter->vdev->dev, dma_addr))
1053 goto map_failed_frags;
1054
1055 descs[i+1].fields.flags_len = desc_flags | frag->size;
1056 descs[i+1].fields.address = dma_addr;
1057 }
1058
1059 if (ibmveth_send(adapter, descs)) {
1060 adapter->tx_send_failed++;
1061 netdev->stats.tx_dropped++;
1062 } else {
1063 netdev->stats.tx_packets++;
1064 netdev->stats.tx_bytes += skb->len;
1065 }
1066
1067 for (i = 0; i < skb_shinfo(skb)->nr_frags + 1; i++)
1068 dma_unmap_page(&adapter->vdev->dev, descs[i].fields.address,
1069 descs[i].fields.flags_len & IBMVETH_BUF_LEN_MASK,
1070 DMA_TO_DEVICE);
1071
1072 out:
1073 dev_kfree_skb(skb);
1074 return NETDEV_TX_OK;
1075
1076 map_failed_frags:
1077 last = i+1;
1078 for (i = 0; i < last; i++)
1079 dma_unmap_page(&adapter->vdev->dev, descs[i].fields.address,
1080 descs[i].fields.flags_len & IBMVETH_BUF_LEN_MASK,
1081 DMA_TO_DEVICE);
1082
1083 map_failed:
1084 if (!firmware_has_feature(FW_FEATURE_CMO))
1085 netdev_err(netdev, "tx: unable to map xmit buffer\n");
1086 adapter->tx_map_failed++;
1087 skb_linearize(skb);
1088 force_bounce = 1;
1089 goto retry_bounce;
1090 }
1091
1092 static int ibmveth_poll(struct napi_struct *napi, int budget)
1093 {
1094 struct ibmveth_adapter *adapter = container_of(napi, struct ibmveth_adapter, napi);
1095 struct net_device *netdev = adapter->netdev;
1096 int frames_processed = 0;
1097 unsigned long lpar_rc;
1098
1099 restart_poll:
1100 do {
1101 if (!ibmveth_rxq_pending_buffer(adapter))
1102 break;
1103
1104 smp_rmb();
1105 if (!ibmveth_rxq_buffer_valid(adapter)) {
1106 wmb(); /* suggested by larson1 */
1107 adapter->rx_invalid_buffer++;
1108 netdev_dbg(netdev, "recycling invalid buffer\n");
1109 ibmveth_rxq_recycle_buffer(adapter);
1110 } else {
1111 struct sk_buff *skb, *new_skb;
1112 int length = ibmveth_rxq_frame_length(adapter);
1113 int offset = ibmveth_rxq_frame_offset(adapter);
1114 int csum_good = ibmveth_rxq_csum_good(adapter);
1115
1116 skb = ibmveth_rxq_get_buffer(adapter);
1117
1118 new_skb = NULL;
1119 if (length < rx_copybreak)
1120 new_skb = netdev_alloc_skb(netdev, length);
1121
1122 if (new_skb) {
1123 skb_copy_to_linear_data(new_skb,
1124 skb->data + offset,
1125 length);
1126 if (rx_flush)
1127 ibmveth_flush_buffer(skb->data,
1128 length + offset);
1129 skb = new_skb;
1130 ibmveth_rxq_recycle_buffer(adapter);
1131 } else {
1132 ibmveth_rxq_harvest_buffer(adapter);
1133 skb_reserve(skb, offset);
1134 }
1135
1136 skb_put(skb, length);
1137 skb->protocol = eth_type_trans(skb, netdev);
1138
1139 if (csum_good)
1140 skb->ip_summed = CHECKSUM_UNNECESSARY;
1141
1142 netif_receive_skb(skb); /* send it up */
1143
1144 netdev->stats.rx_packets++;
1145 netdev->stats.rx_bytes += length;
1146 frames_processed++;
1147 }
1148 } while (frames_processed < budget);
1149
1150 ibmveth_replenish_task(adapter);
1151
1152 if (frames_processed < budget) {
1153 /* We think we are done - reenable interrupts,
1154 * then check once more to make sure we are done.
1155 */
1156 lpar_rc = h_vio_signal(adapter->vdev->unit_address,
1157 VIO_IRQ_ENABLE);
1158
1159 ibmveth_assert(lpar_rc == H_SUCCESS);
1160
1161 napi_complete(napi);
1162
1163 if (ibmveth_rxq_pending_buffer(adapter) &&
1164 napi_reschedule(napi)) {
1165 lpar_rc = h_vio_signal(adapter->vdev->unit_address,
1166 VIO_IRQ_DISABLE);
1167 goto restart_poll;
1168 }
1169 }
1170
1171 return frames_processed;
1172 }
1173
1174 static irqreturn_t ibmveth_interrupt(int irq, void *dev_instance)
1175 {
1176 struct net_device *netdev = dev_instance;
1177 struct ibmveth_adapter *adapter = netdev_priv(netdev);
1178 unsigned long lpar_rc;
1179
1180 if (napi_schedule_prep(&adapter->napi)) {
1181 lpar_rc = h_vio_signal(adapter->vdev->unit_address,
1182 VIO_IRQ_DISABLE);
1183 ibmveth_assert(lpar_rc == H_SUCCESS);
1184 __napi_schedule(&adapter->napi);
1185 }
1186 return IRQ_HANDLED;
1187 }
1188
1189 static void ibmveth_set_multicast_list(struct net_device *netdev)
1190 {
1191 struct ibmveth_adapter *adapter = netdev_priv(netdev);
1192 unsigned long lpar_rc;
1193
1194 if ((netdev->flags & IFF_PROMISC) ||
1195 (netdev_mc_count(netdev) > adapter->mcastFilterSize)) {
1196 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1197 IbmVethMcastEnableRecv |
1198 IbmVethMcastDisableFiltering,
1199 0);
1200 if(lpar_rc != H_SUCCESS) {
1201 netdev_err(netdev, "h_multicast_ctrl rc=%ld when "
1202 "entering promisc mode\n", lpar_rc);
1203 }
1204 } else {
1205 struct netdev_hw_addr *ha;
1206 /* clear the filter table & disable filtering */
1207 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1208 IbmVethMcastEnableRecv |
1209 IbmVethMcastDisableFiltering |
1210 IbmVethMcastClearFilterTable,
1211 0);
1212 if(lpar_rc != H_SUCCESS) {
1213 netdev_err(netdev, "h_multicast_ctrl rc=%ld when "
1214 "attempting to clear filter table\n",
1215 lpar_rc);
1216 }
1217 /* add the addresses to the filter table */
1218 netdev_for_each_mc_addr(ha, netdev) {
1219 // add the multicast address to the filter table
1220 unsigned long mcast_addr = 0;
1221 memcpy(((char *)&mcast_addr)+2, ha->addr, 6);
1222 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1223 IbmVethMcastAddFilter,
1224 mcast_addr);
1225 if(lpar_rc != H_SUCCESS) {
1226 netdev_err(netdev, "h_multicast_ctrl rc=%ld "
1227 "when adding an entry to the filter "
1228 "table\n", lpar_rc);
1229 }
1230 }
1231
1232 /* re-enable filtering */
1233 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1234 IbmVethMcastEnableFiltering,
1235 0);
1236 if(lpar_rc != H_SUCCESS) {
1237 netdev_err(netdev, "h_multicast_ctrl rc=%ld when "
1238 "enabling filtering\n", lpar_rc);
1239 }
1240 }
1241 }
1242
1243 static int ibmveth_change_mtu(struct net_device *dev, int new_mtu)
1244 {
1245 struct ibmveth_adapter *adapter = netdev_priv(dev);
1246 struct vio_dev *viodev = adapter->vdev;
1247 int new_mtu_oh = new_mtu + IBMVETH_BUFF_OH;
1248 int i, rc;
1249 int need_restart = 0;
1250
1251 if (new_mtu < IBMVETH_MIN_MTU)
1252 return -EINVAL;
1253
1254 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
1255 if (new_mtu_oh < adapter->rx_buff_pool[i].buff_size)
1256 break;
1257
1258 if (i == IBMVETH_NUM_BUFF_POOLS)
1259 return -EINVAL;
1260
1261 /* Deactivate all the buffer pools so that the next loop can activate
1262 only the buffer pools necessary to hold the new MTU */
1263 if (netif_running(adapter->netdev)) {
1264 need_restart = 1;
1265 adapter->pool_config = 1;
1266 ibmveth_close(adapter->netdev);
1267 adapter->pool_config = 0;
1268 }
1269
1270 /* Look for an active buffer pool that can hold the new MTU */
1271 for(i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1272 adapter->rx_buff_pool[i].active = 1;
1273
1274 if (new_mtu_oh < adapter->rx_buff_pool[i].buff_size) {
1275 dev->mtu = new_mtu;
1276 vio_cmo_set_dev_desired(viodev,
1277 ibmveth_get_desired_dma
1278 (viodev));
1279 if (need_restart) {
1280 return ibmveth_open(adapter->netdev);
1281 }
1282 return 0;
1283 }
1284 }
1285
1286 if (need_restart && (rc = ibmveth_open(adapter->netdev)))
1287 return rc;
1288
1289 return -EINVAL;
1290 }
1291
1292 #ifdef CONFIG_NET_POLL_CONTROLLER
1293 static void ibmveth_poll_controller(struct net_device *dev)
1294 {
1295 ibmveth_replenish_task(netdev_priv(dev));
1296 ibmveth_interrupt(dev->irq, dev);
1297 }
1298 #endif
1299
1300 /**
1301 * ibmveth_get_desired_dma - Calculate IO memory desired by the driver
1302 *
1303 * @vdev: struct vio_dev for the device whose desired IO mem is to be returned
1304 *
1305 * Return value:
1306 * Number of bytes of IO data the driver will need to perform well.
1307 */
1308 static unsigned long ibmveth_get_desired_dma(struct vio_dev *vdev)
1309 {
1310 struct net_device *netdev = dev_get_drvdata(&vdev->dev);
1311 struct ibmveth_adapter *adapter;
1312 unsigned long ret;
1313 int i;
1314 int rxqentries = 1;
1315
1316 /* netdev inits at probe time along with the structures we need below*/
1317 if (netdev == NULL)
1318 return IOMMU_PAGE_ALIGN(IBMVETH_IO_ENTITLEMENT_DEFAULT);
1319
1320 adapter = netdev_priv(netdev);
1321
1322 ret = IBMVETH_BUFF_LIST_SIZE + IBMVETH_FILT_LIST_SIZE;
1323 ret += IOMMU_PAGE_ALIGN(netdev->mtu);
1324
1325 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1326 /* add the size of the active receive buffers */
1327 if (adapter->rx_buff_pool[i].active)
1328 ret +=
1329 adapter->rx_buff_pool[i].size *
1330 IOMMU_PAGE_ALIGN(adapter->rx_buff_pool[i].
1331 buff_size);
1332 rxqentries += adapter->rx_buff_pool[i].size;
1333 }
1334 /* add the size of the receive queue entries */
1335 ret += IOMMU_PAGE_ALIGN(rxqentries * sizeof(struct ibmveth_rx_q_entry));
1336
1337 return ret;
1338 }
1339
1340 static const struct net_device_ops ibmveth_netdev_ops = {
1341 .ndo_open = ibmveth_open,
1342 .ndo_stop = ibmveth_close,
1343 .ndo_start_xmit = ibmveth_start_xmit,
1344 .ndo_set_multicast_list = ibmveth_set_multicast_list,
1345 .ndo_do_ioctl = ibmveth_ioctl,
1346 .ndo_change_mtu = ibmveth_change_mtu,
1347 .ndo_validate_addr = eth_validate_addr,
1348 .ndo_set_mac_address = eth_mac_addr,
1349 #ifdef CONFIG_NET_POLL_CONTROLLER
1350 .ndo_poll_controller = ibmveth_poll_controller,
1351 #endif
1352 };
1353
1354 static int __devinit ibmveth_probe(struct vio_dev *dev, const struct vio_device_id *id)
1355 {
1356 int rc, i;
1357 struct net_device *netdev;
1358 struct ibmveth_adapter *adapter;
1359
1360 unsigned char *mac_addr_p;
1361 unsigned int *mcastFilterSize_p;
1362
1363
1364 dev_dbg(&dev->dev, "entering ibmveth_probe for UA 0x%x\n",
1365 dev->unit_address);
1366
1367 mac_addr_p = (unsigned char *) vio_get_attribute(dev,
1368 VETH_MAC_ADDR, NULL);
1369 if(!mac_addr_p) {
1370 dev_err(&dev->dev, "Can't find VETH_MAC_ADDR attribute\n");
1371 return 0;
1372 }
1373
1374 mcastFilterSize_p = (unsigned int *) vio_get_attribute(dev,
1375 VETH_MCAST_FILTER_SIZE, NULL);
1376 if(!mcastFilterSize_p) {
1377 dev_err(&dev->dev, "Can't find VETH_MCAST_FILTER_SIZE "
1378 "attribute\n");
1379 return 0;
1380 }
1381
1382 netdev = alloc_etherdev(sizeof(struct ibmveth_adapter));
1383
1384 if(!netdev)
1385 return -ENOMEM;
1386
1387 adapter = netdev_priv(netdev);
1388 dev_set_drvdata(&dev->dev, netdev);
1389
1390 adapter->vdev = dev;
1391 adapter->netdev = netdev;
1392 adapter->mcastFilterSize= *mcastFilterSize_p;
1393 adapter->pool_config = 0;
1394
1395 netif_napi_add(netdev, &adapter->napi, ibmveth_poll, 16);
1396
1397 /* Some older boxes running PHYP non-natively have an OF that
1398 returns a 8-byte local-mac-address field (and the first
1399 2 bytes have to be ignored) while newer boxes' OF return
1400 a 6-byte field. Note that IEEE 1275 specifies that
1401 local-mac-address must be a 6-byte field.
1402 The RPA doc specifies that the first byte must be 10b, so
1403 we'll just look for it to solve this 8 vs. 6 byte field issue */
1404
1405 if ((*mac_addr_p & 0x3) != 0x02)
1406 mac_addr_p += 2;
1407
1408 adapter->mac_addr = 0;
1409 memcpy(&adapter->mac_addr, mac_addr_p, 6);
1410
1411 netdev->irq = dev->irq;
1412 netdev->netdev_ops = &ibmveth_netdev_ops;
1413 netdev->ethtool_ops = &netdev_ethtool_ops;
1414 SET_NETDEV_DEV(netdev, &dev->dev);
1415 netdev->features |= NETIF_F_SG;
1416
1417 memcpy(netdev->dev_addr, &adapter->mac_addr, netdev->addr_len);
1418
1419 for(i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1420 struct kobject *kobj = &adapter->rx_buff_pool[i].kobj;
1421 int error;
1422
1423 ibmveth_init_buffer_pool(&adapter->rx_buff_pool[i], i,
1424 pool_count[i], pool_size[i],
1425 pool_active[i]);
1426 error = kobject_init_and_add(kobj, &ktype_veth_pool,
1427 &dev->dev.kobj, "pool%d", i);
1428 if (!error)
1429 kobject_uevent(kobj, KOBJ_ADD);
1430 }
1431
1432 netdev_dbg(netdev, "adapter @ 0x%p\n", adapter);
1433
1434 adapter->buffer_list_dma = DMA_ERROR_CODE;
1435 adapter->filter_list_dma = DMA_ERROR_CODE;
1436 adapter->rx_queue.queue_dma = DMA_ERROR_CODE;
1437
1438 netdev_dbg(netdev, "registering netdev...\n");
1439
1440 ibmveth_set_csum_offload(netdev, 1, ibmveth_set_tx_csum_flags);
1441
1442 rc = register_netdev(netdev);
1443
1444 if(rc) {
1445 netdev_dbg(netdev, "failed to register netdev rc=%d\n", rc);
1446 free_netdev(netdev);
1447 return rc;
1448 }
1449
1450 netdev_dbg(netdev, "registered\n");
1451
1452 return 0;
1453 }
1454
1455 static int __devexit ibmveth_remove(struct vio_dev *dev)
1456 {
1457 struct net_device *netdev = dev_get_drvdata(&dev->dev);
1458 struct ibmveth_adapter *adapter = netdev_priv(netdev);
1459 int i;
1460
1461 for(i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
1462 kobject_put(&adapter->rx_buff_pool[i].kobj);
1463
1464 unregister_netdev(netdev);
1465
1466 free_netdev(netdev);
1467 dev_set_drvdata(&dev->dev, NULL);
1468
1469 return 0;
1470 }
1471
1472 static struct attribute veth_active_attr;
1473 static struct attribute veth_num_attr;
1474 static struct attribute veth_size_attr;
1475
1476 static ssize_t veth_pool_show(struct kobject * kobj,
1477 struct attribute * attr, char * buf)
1478 {
1479 struct ibmveth_buff_pool *pool = container_of(kobj,
1480 struct ibmveth_buff_pool,
1481 kobj);
1482
1483 if (attr == &veth_active_attr)
1484 return sprintf(buf, "%d\n", pool->active);
1485 else if (attr == &veth_num_attr)
1486 return sprintf(buf, "%d\n", pool->size);
1487 else if (attr == &veth_size_attr)
1488 return sprintf(buf, "%d\n", pool->buff_size);
1489 return 0;
1490 }
1491
1492 static ssize_t veth_pool_store(struct kobject * kobj, struct attribute * attr,
1493 const char * buf, size_t count)
1494 {
1495 struct ibmveth_buff_pool *pool = container_of(kobj,
1496 struct ibmveth_buff_pool,
1497 kobj);
1498 struct net_device *netdev = dev_get_drvdata(
1499 container_of(kobj->parent, struct device, kobj));
1500 struct ibmveth_adapter *adapter = netdev_priv(netdev);
1501 long value = simple_strtol(buf, NULL, 10);
1502 long rc;
1503
1504 if (attr == &veth_active_attr) {
1505 if (value && !pool->active) {
1506 if (netif_running(netdev)) {
1507 if(ibmveth_alloc_buffer_pool(pool)) {
1508 netdev_err(netdev,
1509 "unable to alloc pool\n");
1510 return -ENOMEM;
1511 }
1512 pool->active = 1;
1513 adapter->pool_config = 1;
1514 ibmveth_close(netdev);
1515 adapter->pool_config = 0;
1516 if ((rc = ibmveth_open(netdev)))
1517 return rc;
1518 } else
1519 pool->active = 1;
1520 } else if (!value && pool->active) {
1521 int mtu = netdev->mtu + IBMVETH_BUFF_OH;
1522 int i;
1523 /* Make sure there is a buffer pool with buffers that
1524 can hold a packet of the size of the MTU */
1525 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1526 if (pool == &adapter->rx_buff_pool[i])
1527 continue;
1528 if (!adapter->rx_buff_pool[i].active)
1529 continue;
1530 if (mtu <= adapter->rx_buff_pool[i].buff_size)
1531 break;
1532 }
1533
1534 if (i == IBMVETH_NUM_BUFF_POOLS) {
1535 netdev_err(netdev, "no active pool >= MTU\n");
1536 return -EPERM;
1537 }
1538
1539 if (netif_running(netdev)) {
1540 adapter->pool_config = 1;
1541 ibmveth_close(netdev);
1542 pool->active = 0;
1543 adapter->pool_config = 0;
1544 if ((rc = ibmveth_open(netdev)))
1545 return rc;
1546 }
1547 pool->active = 0;
1548 }
1549 } else if (attr == &veth_num_attr) {
1550 if (value <= 0 || value > IBMVETH_MAX_POOL_COUNT)
1551 return -EINVAL;
1552 else {
1553 if (netif_running(netdev)) {
1554 adapter->pool_config = 1;
1555 ibmveth_close(netdev);
1556 adapter->pool_config = 0;
1557 pool->size = value;
1558 if ((rc = ibmveth_open(netdev)))
1559 return rc;
1560 } else
1561 pool->size = value;
1562 }
1563 } else if (attr == &veth_size_attr) {
1564 if (value <= IBMVETH_BUFF_OH || value > IBMVETH_MAX_BUF_SIZE)
1565 return -EINVAL;
1566 else {
1567 if (netif_running(netdev)) {
1568 adapter->pool_config = 1;
1569 ibmveth_close(netdev);
1570 adapter->pool_config = 0;
1571 pool->buff_size = value;
1572 if ((rc = ibmveth_open(netdev)))
1573 return rc;
1574 } else
1575 pool->buff_size = value;
1576 }
1577 }
1578
1579 /* kick the interrupt handler to allocate/deallocate pools */
1580 ibmveth_interrupt(netdev->irq, netdev);
1581 return count;
1582 }
1583
1584
1585 #define ATTR(_name, _mode) \
1586 struct attribute veth_##_name##_attr = { \
1587 .name = __stringify(_name), .mode = _mode, \
1588 };
1589
1590 static ATTR(active, 0644);
1591 static ATTR(num, 0644);
1592 static ATTR(size, 0644);
1593
1594 static struct attribute * veth_pool_attrs[] = {
1595 &veth_active_attr,
1596 &veth_num_attr,
1597 &veth_size_attr,
1598 NULL,
1599 };
1600
1601 static const struct sysfs_ops veth_pool_ops = {
1602 .show = veth_pool_show,
1603 .store = veth_pool_store,
1604 };
1605
1606 static struct kobj_type ktype_veth_pool = {
1607 .release = NULL,
1608 .sysfs_ops = &veth_pool_ops,
1609 .default_attrs = veth_pool_attrs,
1610 };
1611
1612 static int ibmveth_resume(struct device *dev)
1613 {
1614 struct net_device *netdev = dev_get_drvdata(dev);
1615 ibmveth_interrupt(netdev->irq, netdev);
1616 return 0;
1617 }
1618
1619 static struct vio_device_id ibmveth_device_table[] __devinitdata= {
1620 { "network", "IBM,l-lan"},
1621 { "", "" }
1622 };
1623 MODULE_DEVICE_TABLE(vio, ibmveth_device_table);
1624
1625 static struct dev_pm_ops ibmveth_pm_ops = {
1626 .resume = ibmveth_resume
1627 };
1628
1629 static struct vio_driver ibmveth_driver = {
1630 .id_table = ibmveth_device_table,
1631 .probe = ibmveth_probe,
1632 .remove = ibmveth_remove,
1633 .get_desired_dma = ibmveth_get_desired_dma,
1634 .driver = {
1635 .name = ibmveth_driver_name,
1636 .owner = THIS_MODULE,
1637 .pm = &ibmveth_pm_ops,
1638 }
1639 };
1640
1641 static int __init ibmveth_module_init(void)
1642 {
1643 printk(KERN_DEBUG "%s: %s %s\n", ibmveth_driver_name,
1644 ibmveth_driver_string, ibmveth_driver_version);
1645
1646 return vio_register_driver(&ibmveth_driver);
1647 }
1648
1649 static void __exit ibmveth_module_exit(void)
1650 {
1651 vio_unregister_driver(&ibmveth_driver);
1652 }
1653
1654 module_init(ibmveth_module_init);
1655 module_exit(ibmveth_module_exit);
Linux kernel - Deliverables
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