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net: ethernet: ax88796: avoid null pointer dereference
[deliverable/linux.git] / drivers / net / ethernet / ibm / ibmveth.c
1 /*
2 * IBM Power Virtual Ethernet Device Driver
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, see <http://www.gnu.org/licenses/>.
16 *
17 * Copyright (C) IBM Corporation, 2003, 2010
18 *
19 * Authors: Dave Larson <larson1@us.ibm.com>
20 * Santiago Leon <santil@linux.vnet.ibm.com>
21 * Brian King <brking@linux.vnet.ibm.com>
22 * Robert Jennings <rcj@linux.vnet.ibm.com>
23 * Anton Blanchard <anton@au.ibm.com>
24 */
25
26 #include <linux/module.h>
27 #include <linux/moduleparam.h>
28 #include <linux/types.h>
29 #include <linux/errno.h>
30 #include <linux/dma-mapping.h>
31 #include <linux/kernel.h>
32 #include <linux/netdevice.h>
33 #include <linux/etherdevice.h>
34 #include <linux/skbuff.h>
35 #include <linux/init.h>
36 #include <linux/interrupt.h>
37 #include <linux/mm.h>
38 #include <linux/pm.h>
39 #include <linux/ethtool.h>
40 #include <linux/in.h>
41 #include <linux/ip.h>
42 #include <linux/ipv6.h>
43 #include <linux/slab.h>
44 #include <asm/hvcall.h>
45 #include <linux/atomic.h>
46 #include <asm/vio.h>
47 #include <asm/iommu.h>
48 #include <asm/firmware.h>
49
50 #include "ibmveth.h"
51
52 static irqreturn_t ibmveth_interrupt(int irq, void *dev_instance);
53 static void ibmveth_rxq_harvest_buffer(struct ibmveth_adapter *adapter);
54 static unsigned long ibmveth_get_desired_dma(struct vio_dev *vdev);
55
56 static struct kobj_type ktype_veth_pool;
57
58
59 static const char ibmveth_driver_name[] = "ibmveth";
60 static const char ibmveth_driver_string[] = "IBM Power Virtual Ethernet Driver";
61 #define ibmveth_driver_version "1.05"
62
63 MODULE_AUTHOR("Santiago Leon <santil@linux.vnet.ibm.com>");
64 MODULE_DESCRIPTION("IBM Power Virtual Ethernet Driver");
65 MODULE_LICENSE("GPL");
66 MODULE_VERSION(ibmveth_driver_version);
67
68 static unsigned int tx_copybreak __read_mostly = 128;
69 module_param(tx_copybreak, uint, 0644);
70 MODULE_PARM_DESC(tx_copybreak,
71 "Maximum size of packet that is copied to a new buffer on transmit");
72
73 static unsigned int rx_copybreak __read_mostly = 128;
74 module_param(rx_copybreak, uint, 0644);
75 MODULE_PARM_DESC(rx_copybreak,
76 "Maximum size of packet that is copied to a new buffer on receive");
77
78 static unsigned int rx_flush __read_mostly = 0;
79 module_param(rx_flush, uint, 0644);
80 MODULE_PARM_DESC(rx_flush, "Flush receive buffers before use");
81
82 static bool old_large_send __read_mostly;
83 module_param(old_large_send, bool, S_IRUGO);
84 MODULE_PARM_DESC(old_large_send,
85 "Use old large send method on firmware that supports the new method");
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 { "tx_large_packets", IBMVETH_STAT_OFF(tx_large_packets) },
109 { "rx_large_packets", IBMVETH_STAT_OFF(rx_large_packets) },
110 { "fw_enabled_large_send", IBMVETH_STAT_OFF(fw_large_send_support) }
111 };
112
113 /* simple methods of getting data from the current rxq entry */
114 static inline u32 ibmveth_rxq_flags(struct ibmveth_adapter *adapter)
115 {
116 return be32_to_cpu(adapter->rx_queue.queue_addr[adapter->rx_queue.index].flags_off);
117 }
118
119 static inline int ibmveth_rxq_toggle(struct ibmveth_adapter *adapter)
120 {
121 return (ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_TOGGLE) >>
122 IBMVETH_RXQ_TOGGLE_SHIFT;
123 }
124
125 static inline int ibmveth_rxq_pending_buffer(struct ibmveth_adapter *adapter)
126 {
127 return ibmveth_rxq_toggle(adapter) == adapter->rx_queue.toggle;
128 }
129
130 static inline int ibmveth_rxq_buffer_valid(struct ibmveth_adapter *adapter)
131 {
132 return ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_VALID;
133 }
134
135 static inline int ibmveth_rxq_frame_offset(struct ibmveth_adapter *adapter)
136 {
137 return ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_OFF_MASK;
138 }
139
140 static inline int ibmveth_rxq_frame_length(struct ibmveth_adapter *adapter)
141 {
142 return be32_to_cpu(adapter->rx_queue.queue_addr[adapter->rx_queue.index].length);
143 }
144
145 static inline int ibmveth_rxq_csum_good(struct ibmveth_adapter *adapter)
146 {
147 return ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_CSUM_GOOD;
148 }
149
150 /* setup the initial settings for a buffer pool */
151 static void ibmveth_init_buffer_pool(struct ibmveth_buff_pool *pool,
152 u32 pool_index, u32 pool_size,
153 u32 buff_size, u32 pool_active)
154 {
155 pool->size = pool_size;
156 pool->index = pool_index;
157 pool->buff_size = buff_size;
158 pool->threshold = pool_size * 7 / 8;
159 pool->active = pool_active;
160 }
161
162 /* allocate and setup an buffer pool - called during open */
163 static int ibmveth_alloc_buffer_pool(struct ibmveth_buff_pool *pool)
164 {
165 int i;
166
167 pool->free_map = kmalloc(sizeof(u16) * pool->size, GFP_KERNEL);
168
169 if (!pool->free_map)
170 return -1;
171
172 pool->dma_addr = kcalloc(pool->size, sizeof(dma_addr_t), GFP_KERNEL);
173 if (!pool->dma_addr) {
174 kfree(pool->free_map);
175 pool->free_map = NULL;
176 return -1;
177 }
178
179 pool->skbuff = kcalloc(pool->size, sizeof(void *), GFP_KERNEL);
180
181 if (!pool->skbuff) {
182 kfree(pool->dma_addr);
183 pool->dma_addr = NULL;
184
185 kfree(pool->free_map);
186 pool->free_map = NULL;
187 return -1;
188 }
189
190 for (i = 0; i < pool->size; ++i)
191 pool->free_map[i] = i;
192
193 atomic_set(&pool->available, 0);
194 pool->producer_index = 0;
195 pool->consumer_index = 0;
196
197 return 0;
198 }
199
200 static inline void ibmveth_flush_buffer(void *addr, unsigned long length)
201 {
202 unsigned long offset;
203
204 for (offset = 0; offset < length; offset += SMP_CACHE_BYTES)
205 asm("dcbfl %0,%1" :: "b" (addr), "r" (offset));
206 }
207
208 /* replenish the buffers for a pool. note that we don't need to
209 * skb_reserve these since they are used for incoming...
210 */
211 static void ibmveth_replenish_buffer_pool(struct ibmveth_adapter *adapter,
212 struct ibmveth_buff_pool *pool)
213 {
214 u32 i;
215 u32 count = pool->size - atomic_read(&pool->available);
216 u32 buffers_added = 0;
217 struct sk_buff *skb;
218 unsigned int free_index, index;
219 u64 correlator;
220 unsigned long lpar_rc;
221 dma_addr_t dma_addr;
222
223 mb();
224
225 for (i = 0; i < count; ++i) {
226 union ibmveth_buf_desc desc;
227
228 skb = netdev_alloc_skb(adapter->netdev, pool->buff_size);
229
230 if (!skb) {
231 netdev_dbg(adapter->netdev,
232 "replenish: unable to allocate skb\n");
233 adapter->replenish_no_mem++;
234 break;
235 }
236
237 free_index = pool->consumer_index;
238 pool->consumer_index++;
239 if (pool->consumer_index >= pool->size)
240 pool->consumer_index = 0;
241 index = pool->free_map[free_index];
242
243 BUG_ON(index == IBM_VETH_INVALID_MAP);
244 BUG_ON(pool->skbuff[index] != NULL);
245
246 dma_addr = dma_map_single(&adapter->vdev->dev, skb->data,
247 pool->buff_size, DMA_FROM_DEVICE);
248
249 if (dma_mapping_error(&adapter->vdev->dev, dma_addr))
250 goto failure;
251
252 pool->free_map[free_index] = IBM_VETH_INVALID_MAP;
253 pool->dma_addr[index] = dma_addr;
254 pool->skbuff[index] = skb;
255
256 correlator = ((u64)pool->index << 32) | index;
257 *(u64 *)skb->data = correlator;
258
259 desc.fields.flags_len = IBMVETH_BUF_VALID | pool->buff_size;
260 desc.fields.address = dma_addr;
261
262 if (rx_flush) {
263 unsigned int len = min(pool->buff_size,
264 adapter->netdev->mtu +
265 IBMVETH_BUFF_OH);
266 ibmveth_flush_buffer(skb->data, len);
267 }
268 lpar_rc = h_add_logical_lan_buffer(adapter->vdev->unit_address,
269 desc.desc);
270
271 if (lpar_rc != H_SUCCESS) {
272 goto failure;
273 } else {
274 buffers_added++;
275 adapter->replenish_add_buff_success++;
276 }
277 }
278
279 mb();
280 atomic_add(buffers_added, &(pool->available));
281 return;
282
283 failure:
284 pool->free_map[free_index] = index;
285 pool->skbuff[index] = NULL;
286 if (pool->consumer_index == 0)
287 pool->consumer_index = pool->size - 1;
288 else
289 pool->consumer_index--;
290 if (!dma_mapping_error(&adapter->vdev->dev, dma_addr))
291 dma_unmap_single(&adapter->vdev->dev,
292 pool->dma_addr[index], pool->buff_size,
293 DMA_FROM_DEVICE);
294 dev_kfree_skb_any(skb);
295 adapter->replenish_add_buff_failure++;
296
297 mb();
298 atomic_add(buffers_added, &(pool->available));
299 }
300
301 /*
302 * The final 8 bytes of the buffer list is a counter of frames dropped
303 * because there was not a buffer in the buffer list capable of holding
304 * the frame.
305 */
306 static void ibmveth_update_rx_no_buffer(struct ibmveth_adapter *adapter)
307 {
308 __be64 *p = adapter->buffer_list_addr + 4096 - 8;
309
310 adapter->rx_no_buffer = be64_to_cpup(p);
311 }
312
313 /* replenish routine */
314 static void ibmveth_replenish_task(struct ibmveth_adapter *adapter)
315 {
316 int i;
317
318 adapter->replenish_task_cycles++;
319
320 for (i = (IBMVETH_NUM_BUFF_POOLS - 1); i >= 0; i--) {
321 struct ibmveth_buff_pool *pool = &adapter->rx_buff_pool[i];
322
323 if (pool->active &&
324 (atomic_read(&pool->available) < pool->threshold))
325 ibmveth_replenish_buffer_pool(adapter, pool);
326 }
327
328 ibmveth_update_rx_no_buffer(adapter);
329 }
330
331 /* empty and free ana buffer pool - also used to do cleanup in error paths */
332 static void ibmveth_free_buffer_pool(struct ibmveth_adapter *adapter,
333 struct ibmveth_buff_pool *pool)
334 {
335 int i;
336
337 kfree(pool->free_map);
338 pool->free_map = NULL;
339
340 if (pool->skbuff && pool->dma_addr) {
341 for (i = 0; i < pool->size; ++i) {
342 struct sk_buff *skb = pool->skbuff[i];
343 if (skb) {
344 dma_unmap_single(&adapter->vdev->dev,
345 pool->dma_addr[i],
346 pool->buff_size,
347 DMA_FROM_DEVICE);
348 dev_kfree_skb_any(skb);
349 pool->skbuff[i] = NULL;
350 }
351 }
352 }
353
354 if (pool->dma_addr) {
355 kfree(pool->dma_addr);
356 pool->dma_addr = NULL;
357 }
358
359 if (pool->skbuff) {
360 kfree(pool->skbuff);
361 pool->skbuff = NULL;
362 }
363 }
364
365 /* remove a buffer from a pool */
366 static void ibmveth_remove_buffer_from_pool(struct ibmveth_adapter *adapter,
367 u64 correlator)
368 {
369 unsigned int pool = correlator >> 32;
370 unsigned int index = correlator & 0xffffffffUL;
371 unsigned int free_index;
372 struct sk_buff *skb;
373
374 BUG_ON(pool >= IBMVETH_NUM_BUFF_POOLS);
375 BUG_ON(index >= adapter->rx_buff_pool[pool].size);
376
377 skb = adapter->rx_buff_pool[pool].skbuff[index];
378
379 BUG_ON(skb == NULL);
380
381 adapter->rx_buff_pool[pool].skbuff[index] = NULL;
382
383 dma_unmap_single(&adapter->vdev->dev,
384 adapter->rx_buff_pool[pool].dma_addr[index],
385 adapter->rx_buff_pool[pool].buff_size,
386 DMA_FROM_DEVICE);
387
388 free_index = adapter->rx_buff_pool[pool].producer_index;
389 adapter->rx_buff_pool[pool].producer_index++;
390 if (adapter->rx_buff_pool[pool].producer_index >=
391 adapter->rx_buff_pool[pool].size)
392 adapter->rx_buff_pool[pool].producer_index = 0;
393 adapter->rx_buff_pool[pool].free_map[free_index] = index;
394
395 mb();
396
397 atomic_dec(&(adapter->rx_buff_pool[pool].available));
398 }
399
400 /* get the current buffer on the rx queue */
401 static inline struct sk_buff *ibmveth_rxq_get_buffer(struct ibmveth_adapter *adapter)
402 {
403 u64 correlator = adapter->rx_queue.queue_addr[adapter->rx_queue.index].correlator;
404 unsigned int pool = correlator >> 32;
405 unsigned int index = correlator & 0xffffffffUL;
406
407 BUG_ON(pool >= IBMVETH_NUM_BUFF_POOLS);
408 BUG_ON(index >= adapter->rx_buff_pool[pool].size);
409
410 return adapter->rx_buff_pool[pool].skbuff[index];
411 }
412
413 /* recycle the current buffer on the rx queue */
414 static int ibmveth_rxq_recycle_buffer(struct ibmveth_adapter *adapter)
415 {
416 u32 q_index = adapter->rx_queue.index;
417 u64 correlator = adapter->rx_queue.queue_addr[q_index].correlator;
418 unsigned int pool = correlator >> 32;
419 unsigned int index = correlator & 0xffffffffUL;
420 union ibmveth_buf_desc desc;
421 unsigned long lpar_rc;
422 int ret = 1;
423
424 BUG_ON(pool >= IBMVETH_NUM_BUFF_POOLS);
425 BUG_ON(index >= adapter->rx_buff_pool[pool].size);
426
427 if (!adapter->rx_buff_pool[pool].active) {
428 ibmveth_rxq_harvest_buffer(adapter);
429 ibmveth_free_buffer_pool(adapter, &adapter->rx_buff_pool[pool]);
430 goto out;
431 }
432
433 desc.fields.flags_len = IBMVETH_BUF_VALID |
434 adapter->rx_buff_pool[pool].buff_size;
435 desc.fields.address = adapter->rx_buff_pool[pool].dma_addr[index];
436
437 lpar_rc = h_add_logical_lan_buffer(adapter->vdev->unit_address, desc.desc);
438
439 if (lpar_rc != H_SUCCESS) {
440 netdev_dbg(adapter->netdev, "h_add_logical_lan_buffer failed "
441 "during recycle rc=%ld", lpar_rc);
442 ibmveth_remove_buffer_from_pool(adapter, adapter->rx_queue.queue_addr[adapter->rx_queue.index].correlator);
443 ret = 0;
444 }
445
446 if (++adapter->rx_queue.index == adapter->rx_queue.num_slots) {
447 adapter->rx_queue.index = 0;
448 adapter->rx_queue.toggle = !adapter->rx_queue.toggle;
449 }
450
451 out:
452 return ret;
453 }
454
455 static void ibmveth_rxq_harvest_buffer(struct ibmveth_adapter *adapter)
456 {
457 ibmveth_remove_buffer_from_pool(adapter, adapter->rx_queue.queue_addr[adapter->rx_queue.index].correlator);
458
459 if (++adapter->rx_queue.index == adapter->rx_queue.num_slots) {
460 adapter->rx_queue.index = 0;
461 adapter->rx_queue.toggle = !adapter->rx_queue.toggle;
462 }
463 }
464
465 static void ibmveth_cleanup(struct ibmveth_adapter *adapter)
466 {
467 int i;
468 struct device *dev = &adapter->vdev->dev;
469
470 if (adapter->buffer_list_addr != NULL) {
471 if (!dma_mapping_error(dev, adapter->buffer_list_dma)) {
472 dma_unmap_single(dev, adapter->buffer_list_dma, 4096,
473 DMA_BIDIRECTIONAL);
474 adapter->buffer_list_dma = DMA_ERROR_CODE;
475 }
476 free_page((unsigned long)adapter->buffer_list_addr);
477 adapter->buffer_list_addr = NULL;
478 }
479
480 if (adapter->filter_list_addr != NULL) {
481 if (!dma_mapping_error(dev, adapter->filter_list_dma)) {
482 dma_unmap_single(dev, adapter->filter_list_dma, 4096,
483 DMA_BIDIRECTIONAL);
484 adapter->filter_list_dma = DMA_ERROR_CODE;
485 }
486 free_page((unsigned long)adapter->filter_list_addr);
487 adapter->filter_list_addr = NULL;
488 }
489
490 if (adapter->rx_queue.queue_addr != NULL) {
491 dma_free_coherent(dev, adapter->rx_queue.queue_len,
492 adapter->rx_queue.queue_addr,
493 adapter->rx_queue.queue_dma);
494 adapter->rx_queue.queue_addr = NULL;
495 }
496
497 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
498 if (adapter->rx_buff_pool[i].active)
499 ibmveth_free_buffer_pool(adapter,
500 &adapter->rx_buff_pool[i]);
501
502 if (adapter->bounce_buffer != NULL) {
503 if (!dma_mapping_error(dev, adapter->bounce_buffer_dma)) {
504 dma_unmap_single(&adapter->vdev->dev,
505 adapter->bounce_buffer_dma,
506 adapter->netdev->mtu + IBMVETH_BUFF_OH,
507 DMA_BIDIRECTIONAL);
508 adapter->bounce_buffer_dma = DMA_ERROR_CODE;
509 }
510 kfree(adapter->bounce_buffer);
511 adapter->bounce_buffer = NULL;
512 }
513 }
514
515 static int ibmveth_register_logical_lan(struct ibmveth_adapter *adapter,
516 union ibmveth_buf_desc rxq_desc, u64 mac_address)
517 {
518 int rc, try_again = 1;
519
520 /*
521 * After a kexec the adapter will still be open, so our attempt to
522 * open it will fail. So if we get a failure we free the adapter and
523 * try again, but only once.
524 */
525 retry:
526 rc = h_register_logical_lan(adapter->vdev->unit_address,
527 adapter->buffer_list_dma, rxq_desc.desc,
528 adapter->filter_list_dma, mac_address);
529
530 if (rc != H_SUCCESS && try_again) {
531 do {
532 rc = h_free_logical_lan(adapter->vdev->unit_address);
533 } while (H_IS_LONG_BUSY(rc) || (rc == H_BUSY));
534
535 try_again = 0;
536 goto retry;
537 }
538
539 return rc;
540 }
541
542 static u64 ibmveth_encode_mac_addr(u8 *mac)
543 {
544 int i;
545 u64 encoded = 0;
546
547 for (i = 0; i < ETH_ALEN; i++)
548 encoded = (encoded << 8) | mac[i];
549
550 return encoded;
551 }
552
553 static int ibmveth_open(struct net_device *netdev)
554 {
555 struct ibmveth_adapter *adapter = netdev_priv(netdev);
556 u64 mac_address;
557 int rxq_entries = 1;
558 unsigned long lpar_rc;
559 int rc;
560 union ibmveth_buf_desc rxq_desc;
561 int i;
562 struct device *dev;
563
564 netdev_dbg(netdev, "open starting\n");
565
566 napi_enable(&adapter->napi);
567
568 for(i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
569 rxq_entries += adapter->rx_buff_pool[i].size;
570
571 adapter->buffer_list_addr = (void*) get_zeroed_page(GFP_KERNEL);
572 adapter->filter_list_addr = (void*) get_zeroed_page(GFP_KERNEL);
573
574 if (!adapter->buffer_list_addr || !adapter->filter_list_addr) {
575 netdev_err(netdev, "unable to allocate filter or buffer list "
576 "pages\n");
577 rc = -ENOMEM;
578 goto err_out;
579 }
580
581 dev = &adapter->vdev->dev;
582
583 adapter->rx_queue.queue_len = sizeof(struct ibmveth_rx_q_entry) *
584 rxq_entries;
585 adapter->rx_queue.queue_addr =
586 dma_alloc_coherent(dev, adapter->rx_queue.queue_len,
587 &adapter->rx_queue.queue_dma, GFP_KERNEL);
588 if (!adapter->rx_queue.queue_addr) {
589 rc = -ENOMEM;
590 goto err_out;
591 }
592
593 adapter->buffer_list_dma = dma_map_single(dev,
594 adapter->buffer_list_addr, 4096, DMA_BIDIRECTIONAL);
595 adapter->filter_list_dma = dma_map_single(dev,
596 adapter->filter_list_addr, 4096, DMA_BIDIRECTIONAL);
597
598 if ((dma_mapping_error(dev, adapter->buffer_list_dma)) ||
599 (dma_mapping_error(dev, adapter->filter_list_dma))) {
600 netdev_err(netdev, "unable to map filter or buffer list "
601 "pages\n");
602 rc = -ENOMEM;
603 goto err_out;
604 }
605
606 adapter->rx_queue.index = 0;
607 adapter->rx_queue.num_slots = rxq_entries;
608 adapter->rx_queue.toggle = 1;
609
610 mac_address = ibmveth_encode_mac_addr(netdev->dev_addr);
611
612 rxq_desc.fields.flags_len = IBMVETH_BUF_VALID |
613 adapter->rx_queue.queue_len;
614 rxq_desc.fields.address = adapter->rx_queue.queue_dma;
615
616 netdev_dbg(netdev, "buffer list @ 0x%p\n", adapter->buffer_list_addr);
617 netdev_dbg(netdev, "filter list @ 0x%p\n", adapter->filter_list_addr);
618 netdev_dbg(netdev, "receive q @ 0x%p\n", adapter->rx_queue.queue_addr);
619
620 h_vio_signal(adapter->vdev->unit_address, VIO_IRQ_DISABLE);
621
622 lpar_rc = ibmveth_register_logical_lan(adapter, rxq_desc, mac_address);
623
624 if (lpar_rc != H_SUCCESS) {
625 netdev_err(netdev, "h_register_logical_lan failed with %ld\n",
626 lpar_rc);
627 netdev_err(netdev, "buffer TCE:0x%llx filter TCE:0x%llx rxq "
628 "desc:0x%llx MAC:0x%llx\n",
629 adapter->buffer_list_dma,
630 adapter->filter_list_dma,
631 rxq_desc.desc,
632 mac_address);
633 rc = -ENONET;
634 goto err_out;
635 }
636
637 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
638 if (!adapter->rx_buff_pool[i].active)
639 continue;
640 if (ibmveth_alloc_buffer_pool(&adapter->rx_buff_pool[i])) {
641 netdev_err(netdev, "unable to alloc pool\n");
642 adapter->rx_buff_pool[i].active = 0;
643 rc = -ENOMEM;
644 goto err_out;
645 }
646 }
647
648 netdev_dbg(netdev, "registering irq 0x%x\n", netdev->irq);
649 rc = request_irq(netdev->irq, ibmveth_interrupt, 0, netdev->name,
650 netdev);
651 if (rc != 0) {
652 netdev_err(netdev, "unable to request irq 0x%x, rc %d\n",
653 netdev->irq, rc);
654 do {
655 lpar_rc = h_free_logical_lan(adapter->vdev->unit_address);
656 } while (H_IS_LONG_BUSY(lpar_rc) || (lpar_rc == H_BUSY));
657
658 goto err_out;
659 }
660
661 adapter->bounce_buffer =
662 kmalloc(netdev->mtu + IBMVETH_BUFF_OH, GFP_KERNEL);
663 if (!adapter->bounce_buffer) {
664 rc = -ENOMEM;
665 goto err_out_free_irq;
666 }
667 adapter->bounce_buffer_dma =
668 dma_map_single(&adapter->vdev->dev, adapter->bounce_buffer,
669 netdev->mtu + IBMVETH_BUFF_OH, DMA_BIDIRECTIONAL);
670 if (dma_mapping_error(dev, adapter->bounce_buffer_dma)) {
671 netdev_err(netdev, "unable to map bounce buffer\n");
672 rc = -ENOMEM;
673 goto err_out_free_irq;
674 }
675
676 netdev_dbg(netdev, "initial replenish cycle\n");
677 ibmveth_interrupt(netdev->irq, netdev);
678
679 netif_start_queue(netdev);
680
681 netdev_dbg(netdev, "open complete\n");
682
683 return 0;
684
685 err_out_free_irq:
686 free_irq(netdev->irq, netdev);
687 err_out:
688 ibmveth_cleanup(adapter);
689 napi_disable(&adapter->napi);
690 return rc;
691 }
692
693 static int ibmveth_close(struct net_device *netdev)
694 {
695 struct ibmveth_adapter *adapter = netdev_priv(netdev);
696 long lpar_rc;
697
698 netdev_dbg(netdev, "close starting\n");
699
700 napi_disable(&adapter->napi);
701
702 if (!adapter->pool_config)
703 netif_stop_queue(netdev);
704
705 h_vio_signal(adapter->vdev->unit_address, VIO_IRQ_DISABLE);
706
707 do {
708 lpar_rc = h_free_logical_lan(adapter->vdev->unit_address);
709 } while (H_IS_LONG_BUSY(lpar_rc) || (lpar_rc == H_BUSY));
710
711 if (lpar_rc != H_SUCCESS) {
712 netdev_err(netdev, "h_free_logical_lan failed with %lx, "
713 "continuing with close\n", lpar_rc);
714 }
715
716 free_irq(netdev->irq, netdev);
717
718 ibmveth_update_rx_no_buffer(adapter);
719
720 ibmveth_cleanup(adapter);
721
722 netdev_dbg(netdev, "close complete\n");
723
724 return 0;
725 }
726
727 static int netdev_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
728 {
729 cmd->supported = (SUPPORTED_1000baseT_Full | SUPPORTED_Autoneg |
730 SUPPORTED_FIBRE);
731 cmd->advertising = (ADVERTISED_1000baseT_Full | ADVERTISED_Autoneg |
732 ADVERTISED_FIBRE);
733 ethtool_cmd_speed_set(cmd, SPEED_1000);
734 cmd->duplex = DUPLEX_FULL;
735 cmd->port = PORT_FIBRE;
736 cmd->phy_address = 0;
737 cmd->transceiver = XCVR_INTERNAL;
738 cmd->autoneg = AUTONEG_ENABLE;
739 cmd->maxtxpkt = 0;
740 cmd->maxrxpkt = 1;
741 return 0;
742 }
743
744 static void netdev_get_drvinfo(struct net_device *dev,
745 struct ethtool_drvinfo *info)
746 {
747 strlcpy(info->driver, ibmveth_driver_name, sizeof(info->driver));
748 strlcpy(info->version, ibmveth_driver_version, sizeof(info->version));
749 }
750
751 static netdev_features_t ibmveth_fix_features(struct net_device *dev,
752 netdev_features_t features)
753 {
754 /*
755 * Since the ibmveth firmware interface does not have the
756 * concept of separate tx/rx checksum offload enable, if rx
757 * checksum is disabled we also have to disable tx checksum
758 * offload. Once we disable rx checksum offload, we are no
759 * longer allowed to send tx buffers that are not properly
760 * checksummed.
761 */
762
763 if (!(features & NETIF_F_RXCSUM))
764 features &= ~NETIF_F_CSUM_MASK;
765
766 return features;
767 }
768
769 static int ibmveth_set_csum_offload(struct net_device *dev, u32 data)
770 {
771 struct ibmveth_adapter *adapter = netdev_priv(dev);
772 unsigned long set_attr, clr_attr, ret_attr;
773 unsigned long set_attr6, clr_attr6;
774 long ret, ret4, ret6;
775 int rc1 = 0, rc2 = 0;
776 int restart = 0;
777
778 if (netif_running(dev)) {
779 restart = 1;
780 adapter->pool_config = 1;
781 ibmveth_close(dev);
782 adapter->pool_config = 0;
783 }
784
785 set_attr = 0;
786 clr_attr = 0;
787 set_attr6 = 0;
788 clr_attr6 = 0;
789
790 if (data) {
791 set_attr = IBMVETH_ILLAN_IPV4_TCP_CSUM;
792 set_attr6 = IBMVETH_ILLAN_IPV6_TCP_CSUM;
793 } else {
794 clr_attr = IBMVETH_ILLAN_IPV4_TCP_CSUM;
795 clr_attr6 = IBMVETH_ILLAN_IPV6_TCP_CSUM;
796 }
797
798 ret = h_illan_attributes(adapter->vdev->unit_address, 0, 0, &ret_attr);
799
800 if (ret == H_SUCCESS && !(ret_attr & IBMVETH_ILLAN_ACTIVE_TRUNK) &&
801 !(ret_attr & IBMVETH_ILLAN_TRUNK_PRI_MASK) &&
802 (ret_attr & IBMVETH_ILLAN_PADDED_PKT_CSUM)) {
803 ret4 = h_illan_attributes(adapter->vdev->unit_address, clr_attr,
804 set_attr, &ret_attr);
805
806 if (ret4 != H_SUCCESS) {
807 netdev_err(dev, "unable to change IPv4 checksum "
808 "offload settings. %d rc=%ld\n",
809 data, ret4);
810
811 h_illan_attributes(adapter->vdev->unit_address,
812 set_attr, clr_attr, &ret_attr);
813
814 if (data == 1)
815 dev->features &= ~NETIF_F_IP_CSUM;
816
817 } else {
818 adapter->fw_ipv4_csum_support = data;
819 }
820
821 ret6 = h_illan_attributes(adapter->vdev->unit_address,
822 clr_attr6, set_attr6, &ret_attr);
823
824 if (ret6 != H_SUCCESS) {
825 netdev_err(dev, "unable to change IPv6 checksum "
826 "offload settings. %d rc=%ld\n",
827 data, ret6);
828
829 h_illan_attributes(adapter->vdev->unit_address,
830 set_attr6, clr_attr6, &ret_attr);
831
832 if (data == 1)
833 dev->features &= ~NETIF_F_IPV6_CSUM;
834
835 } else
836 adapter->fw_ipv6_csum_support = data;
837
838 if (ret4 == H_SUCCESS || ret6 == H_SUCCESS)
839 adapter->rx_csum = data;
840 else
841 rc1 = -EIO;
842 } else {
843 rc1 = -EIO;
844 netdev_err(dev, "unable to change checksum offload settings."
845 " %d rc=%ld ret_attr=%lx\n", data, ret,
846 ret_attr);
847 }
848
849 if (restart)
850 rc2 = ibmveth_open(dev);
851
852 return rc1 ? rc1 : rc2;
853 }
854
855 static int ibmveth_set_tso(struct net_device *dev, u32 data)
856 {
857 struct ibmveth_adapter *adapter = netdev_priv(dev);
858 unsigned long set_attr, clr_attr, ret_attr;
859 long ret1, ret2;
860 int rc1 = 0, rc2 = 0;
861 int restart = 0;
862
863 if (netif_running(dev)) {
864 restart = 1;
865 adapter->pool_config = 1;
866 ibmveth_close(dev);
867 adapter->pool_config = 0;
868 }
869
870 set_attr = 0;
871 clr_attr = 0;
872
873 if (data)
874 set_attr = IBMVETH_ILLAN_LRG_SR_ENABLED;
875 else
876 clr_attr = IBMVETH_ILLAN_LRG_SR_ENABLED;
877
878 ret1 = h_illan_attributes(adapter->vdev->unit_address, 0, 0, &ret_attr);
879
880 if (ret1 == H_SUCCESS && (ret_attr & IBMVETH_ILLAN_LRG_SND_SUPPORT) &&
881 !old_large_send) {
882 ret2 = h_illan_attributes(adapter->vdev->unit_address, clr_attr,
883 set_attr, &ret_attr);
884
885 if (ret2 != H_SUCCESS) {
886 netdev_err(dev, "unable to change tso settings. %d rc=%ld\n",
887 data, ret2);
888
889 h_illan_attributes(adapter->vdev->unit_address,
890 set_attr, clr_attr, &ret_attr);
891
892 if (data == 1)
893 dev->features &= ~(NETIF_F_TSO | NETIF_F_TSO6);
894 rc1 = -EIO;
895
896 } else {
897 adapter->fw_large_send_support = data;
898 adapter->large_send = data;
899 }
900 } else {
901 /* Older firmware version of large send offload does not
902 * support tcp6/ipv6
903 */
904 if (data == 1) {
905 dev->features &= ~NETIF_F_TSO6;
906 netdev_info(dev, "TSO feature requires all partitions to have updated driver");
907 }
908 adapter->large_send = data;
909 }
910
911 if (restart)
912 rc2 = ibmveth_open(dev);
913
914 return rc1 ? rc1 : rc2;
915 }
916
917 static int ibmveth_set_features(struct net_device *dev,
918 netdev_features_t features)
919 {
920 struct ibmveth_adapter *adapter = netdev_priv(dev);
921 int rx_csum = !!(features & NETIF_F_RXCSUM);
922 int large_send = !!(features & (NETIF_F_TSO | NETIF_F_TSO6));
923 int rc1 = 0, rc2 = 0;
924
925 if (rx_csum != adapter->rx_csum) {
926 rc1 = ibmveth_set_csum_offload(dev, rx_csum);
927 if (rc1 && !adapter->rx_csum)
928 dev->features =
929 features & ~(NETIF_F_CSUM_MASK |
930 NETIF_F_RXCSUM);
931 }
932
933 if (large_send != adapter->large_send) {
934 rc2 = ibmveth_set_tso(dev, large_send);
935 if (rc2 && !adapter->large_send)
936 dev->features =
937 features & ~(NETIF_F_TSO | NETIF_F_TSO6);
938 }
939
940 return rc1 ? rc1 : rc2;
941 }
942
943 static void ibmveth_get_strings(struct net_device *dev, u32 stringset, u8 *data)
944 {
945 int i;
946
947 if (stringset != ETH_SS_STATS)
948 return;
949
950 for (i = 0; i < ARRAY_SIZE(ibmveth_stats); i++, data += ETH_GSTRING_LEN)
951 memcpy(data, ibmveth_stats[i].name, ETH_GSTRING_LEN);
952 }
953
954 static int ibmveth_get_sset_count(struct net_device *dev, int sset)
955 {
956 switch (sset) {
957 case ETH_SS_STATS:
958 return ARRAY_SIZE(ibmveth_stats);
959 default:
960 return -EOPNOTSUPP;
961 }
962 }
963
964 static void ibmveth_get_ethtool_stats(struct net_device *dev,
965 struct ethtool_stats *stats, u64 *data)
966 {
967 int i;
968 struct ibmveth_adapter *adapter = netdev_priv(dev);
969
970 for (i = 0; i < ARRAY_SIZE(ibmveth_stats); i++)
971 data[i] = IBMVETH_GET_STAT(adapter, ibmveth_stats[i].offset);
972 }
973
974 static const struct ethtool_ops netdev_ethtool_ops = {
975 .get_drvinfo = netdev_get_drvinfo,
976 .get_settings = netdev_get_settings,
977 .get_link = ethtool_op_get_link,
978 .get_strings = ibmveth_get_strings,
979 .get_sset_count = ibmveth_get_sset_count,
980 .get_ethtool_stats = ibmveth_get_ethtool_stats,
981 };
982
983 static int ibmveth_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
984 {
985 return -EOPNOTSUPP;
986 }
987
988 #define page_offset(v) ((unsigned long)(v) & ((1 << 12) - 1))
989
990 static int ibmveth_send(struct ibmveth_adapter *adapter,
991 union ibmveth_buf_desc *descs, unsigned long mss)
992 {
993 unsigned long correlator;
994 unsigned int retry_count;
995 unsigned long ret;
996
997 /*
998 * The retry count sets a maximum for the number of broadcast and
999 * multicast destinations within the system.
1000 */
1001 retry_count = 1024;
1002 correlator = 0;
1003 do {
1004 ret = h_send_logical_lan(adapter->vdev->unit_address,
1005 descs[0].desc, descs[1].desc,
1006 descs[2].desc, descs[3].desc,
1007 descs[4].desc, descs[5].desc,
1008 correlator, &correlator, mss,
1009 adapter->fw_large_send_support);
1010 } while ((ret == H_BUSY) && (retry_count--));
1011
1012 if (ret != H_SUCCESS && ret != H_DROPPED) {
1013 netdev_err(adapter->netdev, "tx: h_send_logical_lan failed "
1014 "with rc=%ld\n", ret);
1015 return 1;
1016 }
1017
1018 return 0;
1019 }
1020
1021 static netdev_tx_t ibmveth_start_xmit(struct sk_buff *skb,
1022 struct net_device *netdev)
1023 {
1024 struct ibmveth_adapter *adapter = netdev_priv(netdev);
1025 unsigned int desc_flags;
1026 union ibmveth_buf_desc descs[6];
1027 int last, i;
1028 int force_bounce = 0;
1029 dma_addr_t dma_addr;
1030 unsigned long mss = 0;
1031
1032 /*
1033 * veth handles a maximum of 6 segments including the header, so
1034 * we have to linearize the skb if there are more than this.
1035 */
1036 if (skb_shinfo(skb)->nr_frags > 5 && __skb_linearize(skb)) {
1037 netdev->stats.tx_dropped++;
1038 goto out;
1039 }
1040
1041 /* veth can't checksum offload UDP */
1042 if (skb->ip_summed == CHECKSUM_PARTIAL &&
1043 ((skb->protocol == htons(ETH_P_IP) &&
1044 ip_hdr(skb)->protocol != IPPROTO_TCP) ||
1045 (skb->protocol == htons(ETH_P_IPV6) &&
1046 ipv6_hdr(skb)->nexthdr != IPPROTO_TCP)) &&
1047 skb_checksum_help(skb)) {
1048
1049 netdev_err(netdev, "tx: failed to checksum packet\n");
1050 netdev->stats.tx_dropped++;
1051 goto out;
1052 }
1053
1054 desc_flags = IBMVETH_BUF_VALID;
1055
1056 if (skb_is_gso(skb) && adapter->fw_large_send_support)
1057 desc_flags |= IBMVETH_BUF_LRG_SND;
1058
1059 if (skb->ip_summed == CHECKSUM_PARTIAL) {
1060 unsigned char *buf = skb_transport_header(skb) +
1061 skb->csum_offset;
1062
1063 desc_flags |= (IBMVETH_BUF_NO_CSUM | IBMVETH_BUF_CSUM_GOOD);
1064
1065 /* Need to zero out the checksum */
1066 buf[0] = 0;
1067 buf[1] = 0;
1068 }
1069
1070 retry_bounce:
1071 memset(descs, 0, sizeof(descs));
1072
1073 /*
1074 * If a linear packet is below the rx threshold then
1075 * copy it into the static bounce buffer. This avoids the
1076 * cost of a TCE insert and remove.
1077 */
1078 if (force_bounce || (!skb_is_nonlinear(skb) &&
1079 (skb->len < tx_copybreak))) {
1080 skb_copy_from_linear_data(skb, adapter->bounce_buffer,
1081 skb->len);
1082
1083 descs[0].fields.flags_len = desc_flags | skb->len;
1084 descs[0].fields.address = adapter->bounce_buffer_dma;
1085
1086 if (ibmveth_send(adapter, descs, 0)) {
1087 adapter->tx_send_failed++;
1088 netdev->stats.tx_dropped++;
1089 } else {
1090 netdev->stats.tx_packets++;
1091 netdev->stats.tx_bytes += skb->len;
1092 }
1093
1094 goto out;
1095 }
1096
1097 /* Map the header */
1098 dma_addr = dma_map_single(&adapter->vdev->dev, skb->data,
1099 skb_headlen(skb), DMA_TO_DEVICE);
1100 if (dma_mapping_error(&adapter->vdev->dev, dma_addr))
1101 goto map_failed;
1102
1103 descs[0].fields.flags_len = desc_flags | skb_headlen(skb);
1104 descs[0].fields.address = dma_addr;
1105
1106 /* Map the frags */
1107 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1108 const skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1109
1110 dma_addr = skb_frag_dma_map(&adapter->vdev->dev, frag, 0,
1111 skb_frag_size(frag), DMA_TO_DEVICE);
1112
1113 if (dma_mapping_error(&adapter->vdev->dev, dma_addr))
1114 goto map_failed_frags;
1115
1116 descs[i+1].fields.flags_len = desc_flags | skb_frag_size(frag);
1117 descs[i+1].fields.address = dma_addr;
1118 }
1119
1120 if (skb_is_gso(skb)) {
1121 if (adapter->fw_large_send_support) {
1122 mss = (unsigned long)skb_shinfo(skb)->gso_size;
1123 adapter->tx_large_packets++;
1124 } else if (!skb_is_gso_v6(skb)) {
1125 /* Put -1 in the IP checksum to tell phyp it
1126 * is a largesend packet. Put the mss in
1127 * the TCP checksum.
1128 */
1129 ip_hdr(skb)->check = 0xffff;
1130 tcp_hdr(skb)->check =
1131 cpu_to_be16(skb_shinfo(skb)->gso_size);
1132 adapter->tx_large_packets++;
1133 }
1134 }
1135
1136 if (ibmveth_send(adapter, descs, mss)) {
1137 adapter->tx_send_failed++;
1138 netdev->stats.tx_dropped++;
1139 } else {
1140 netdev->stats.tx_packets++;
1141 netdev->stats.tx_bytes += skb->len;
1142 }
1143
1144 dma_unmap_single(&adapter->vdev->dev,
1145 descs[0].fields.address,
1146 descs[0].fields.flags_len & IBMVETH_BUF_LEN_MASK,
1147 DMA_TO_DEVICE);
1148
1149 for (i = 1; i < skb_shinfo(skb)->nr_frags + 1; i++)
1150 dma_unmap_page(&adapter->vdev->dev, descs[i].fields.address,
1151 descs[i].fields.flags_len & IBMVETH_BUF_LEN_MASK,
1152 DMA_TO_DEVICE);
1153
1154 out:
1155 dev_consume_skb_any(skb);
1156 return NETDEV_TX_OK;
1157
1158 map_failed_frags:
1159 last = i+1;
1160 for (i = 0; i < last; i++)
1161 dma_unmap_page(&adapter->vdev->dev, descs[i].fields.address,
1162 descs[i].fields.flags_len & IBMVETH_BUF_LEN_MASK,
1163 DMA_TO_DEVICE);
1164
1165 map_failed:
1166 if (!firmware_has_feature(FW_FEATURE_CMO))
1167 netdev_err(netdev, "tx: unable to map xmit buffer\n");
1168 adapter->tx_map_failed++;
1169 if (skb_linearize(skb)) {
1170 netdev->stats.tx_dropped++;
1171 goto out;
1172 }
1173 force_bounce = 1;
1174 goto retry_bounce;
1175 }
1176
1177 static int ibmveth_poll(struct napi_struct *napi, int budget)
1178 {
1179 struct ibmveth_adapter *adapter =
1180 container_of(napi, struct ibmveth_adapter, napi);
1181 struct net_device *netdev = adapter->netdev;
1182 int frames_processed = 0;
1183 unsigned long lpar_rc;
1184 struct iphdr *iph;
1185
1186 restart_poll:
1187 while (frames_processed < budget) {
1188 if (!ibmveth_rxq_pending_buffer(adapter))
1189 break;
1190
1191 smp_rmb();
1192 if (!ibmveth_rxq_buffer_valid(adapter)) {
1193 wmb(); /* suggested by larson1 */
1194 adapter->rx_invalid_buffer++;
1195 netdev_dbg(netdev, "recycling invalid buffer\n");
1196 ibmveth_rxq_recycle_buffer(adapter);
1197 } else {
1198 struct sk_buff *skb, *new_skb;
1199 int length = ibmveth_rxq_frame_length(adapter);
1200 int offset = ibmveth_rxq_frame_offset(adapter);
1201 int csum_good = ibmveth_rxq_csum_good(adapter);
1202
1203 skb = ibmveth_rxq_get_buffer(adapter);
1204
1205 new_skb = NULL;
1206 if (length < rx_copybreak)
1207 new_skb = netdev_alloc_skb(netdev, length);
1208
1209 if (new_skb) {
1210 skb_copy_to_linear_data(new_skb,
1211 skb->data + offset,
1212 length);
1213 if (rx_flush)
1214 ibmveth_flush_buffer(skb->data,
1215 length + offset);
1216 if (!ibmveth_rxq_recycle_buffer(adapter))
1217 kfree_skb(skb);
1218 skb = new_skb;
1219 } else {
1220 ibmveth_rxq_harvest_buffer(adapter);
1221 skb_reserve(skb, offset);
1222 }
1223
1224 skb_put(skb, length);
1225 skb->protocol = eth_type_trans(skb, netdev);
1226
1227 if (csum_good) {
1228 skb->ip_summed = CHECKSUM_UNNECESSARY;
1229 if (be16_to_cpu(skb->protocol) == ETH_P_IP) {
1230 iph = (struct iphdr *)skb->data;
1231
1232 /* If the IP checksum is not offloaded and if the packet
1233 * is large send, the checksum must be rebuilt.
1234 */
1235 if (iph->check == 0xffff) {
1236 iph->check = 0;
1237 iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl);
1238 adapter->rx_large_packets++;
1239 }
1240 }
1241 }
1242
1243 napi_gro_receive(napi, skb); /* send it up */
1244
1245 netdev->stats.rx_packets++;
1246 netdev->stats.rx_bytes += length;
1247 frames_processed++;
1248 }
1249 }
1250
1251 ibmveth_replenish_task(adapter);
1252
1253 if (frames_processed < budget) {
1254 napi_complete(napi);
1255
1256 /* We think we are done - reenable interrupts,
1257 * then check once more to make sure we are done.
1258 */
1259 lpar_rc = h_vio_signal(adapter->vdev->unit_address,
1260 VIO_IRQ_ENABLE);
1261
1262 BUG_ON(lpar_rc != H_SUCCESS);
1263
1264 if (ibmveth_rxq_pending_buffer(adapter) &&
1265 napi_reschedule(napi)) {
1266 lpar_rc = h_vio_signal(adapter->vdev->unit_address,
1267 VIO_IRQ_DISABLE);
1268 goto restart_poll;
1269 }
1270 }
1271
1272 return frames_processed;
1273 }
1274
1275 static irqreturn_t ibmveth_interrupt(int irq, void *dev_instance)
1276 {
1277 struct net_device *netdev = dev_instance;
1278 struct ibmveth_adapter *adapter = netdev_priv(netdev);
1279 unsigned long lpar_rc;
1280
1281 if (napi_schedule_prep(&adapter->napi)) {
1282 lpar_rc = h_vio_signal(adapter->vdev->unit_address,
1283 VIO_IRQ_DISABLE);
1284 BUG_ON(lpar_rc != H_SUCCESS);
1285 __napi_schedule(&adapter->napi);
1286 }
1287 return IRQ_HANDLED;
1288 }
1289
1290 static void ibmveth_set_multicast_list(struct net_device *netdev)
1291 {
1292 struct ibmveth_adapter *adapter = netdev_priv(netdev);
1293 unsigned long lpar_rc;
1294
1295 if ((netdev->flags & IFF_PROMISC) ||
1296 (netdev_mc_count(netdev) > adapter->mcastFilterSize)) {
1297 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1298 IbmVethMcastEnableRecv |
1299 IbmVethMcastDisableFiltering,
1300 0);
1301 if (lpar_rc != H_SUCCESS) {
1302 netdev_err(netdev, "h_multicast_ctrl rc=%ld when "
1303 "entering promisc mode\n", lpar_rc);
1304 }
1305 } else {
1306 struct netdev_hw_addr *ha;
1307 /* clear the filter table & disable filtering */
1308 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1309 IbmVethMcastEnableRecv |
1310 IbmVethMcastDisableFiltering |
1311 IbmVethMcastClearFilterTable,
1312 0);
1313 if (lpar_rc != H_SUCCESS) {
1314 netdev_err(netdev, "h_multicast_ctrl rc=%ld when "
1315 "attempting to clear filter table\n",
1316 lpar_rc);
1317 }
1318 /* add the addresses to the filter table */
1319 netdev_for_each_mc_addr(ha, netdev) {
1320 /* add the multicast address to the filter table */
1321 u64 mcast_addr;
1322 mcast_addr = ibmveth_encode_mac_addr(ha->addr);
1323 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1324 IbmVethMcastAddFilter,
1325 mcast_addr);
1326 if (lpar_rc != H_SUCCESS) {
1327 netdev_err(netdev, "h_multicast_ctrl rc=%ld "
1328 "when adding an entry to the filter "
1329 "table\n", lpar_rc);
1330 }
1331 }
1332
1333 /* re-enable filtering */
1334 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1335 IbmVethMcastEnableFiltering,
1336 0);
1337 if (lpar_rc != H_SUCCESS) {
1338 netdev_err(netdev, "h_multicast_ctrl rc=%ld when "
1339 "enabling filtering\n", lpar_rc);
1340 }
1341 }
1342 }
1343
1344 static int ibmveth_change_mtu(struct net_device *dev, int new_mtu)
1345 {
1346 struct ibmveth_adapter *adapter = netdev_priv(dev);
1347 struct vio_dev *viodev = adapter->vdev;
1348 int new_mtu_oh = new_mtu + IBMVETH_BUFF_OH;
1349 int i, rc;
1350 int need_restart = 0;
1351
1352 if (new_mtu < IBMVETH_MIN_MTU)
1353 return -EINVAL;
1354
1355 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
1356 if (new_mtu_oh <= adapter->rx_buff_pool[i].buff_size)
1357 break;
1358
1359 if (i == IBMVETH_NUM_BUFF_POOLS)
1360 return -EINVAL;
1361
1362 /* Deactivate all the buffer pools so that the next loop can activate
1363 only the buffer pools necessary to hold the new MTU */
1364 if (netif_running(adapter->netdev)) {
1365 need_restart = 1;
1366 adapter->pool_config = 1;
1367 ibmveth_close(adapter->netdev);
1368 adapter->pool_config = 0;
1369 }
1370
1371 /* Look for an active buffer pool that can hold the new MTU */
1372 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1373 adapter->rx_buff_pool[i].active = 1;
1374
1375 if (new_mtu_oh <= adapter->rx_buff_pool[i].buff_size) {
1376 dev->mtu = new_mtu;
1377 vio_cmo_set_dev_desired(viodev,
1378 ibmveth_get_desired_dma
1379 (viodev));
1380 if (need_restart) {
1381 return ibmveth_open(adapter->netdev);
1382 }
1383 return 0;
1384 }
1385 }
1386
1387 if (need_restart && (rc = ibmveth_open(adapter->netdev)))
1388 return rc;
1389
1390 return -EINVAL;
1391 }
1392
1393 #ifdef CONFIG_NET_POLL_CONTROLLER
1394 static void ibmveth_poll_controller(struct net_device *dev)
1395 {
1396 ibmveth_replenish_task(netdev_priv(dev));
1397 ibmveth_interrupt(dev->irq, dev);
1398 }
1399 #endif
1400
1401 /**
1402 * ibmveth_get_desired_dma - Calculate IO memory desired by the driver
1403 *
1404 * @vdev: struct vio_dev for the device whose desired IO mem is to be returned
1405 *
1406 * Return value:
1407 * Number of bytes of IO data the driver will need to perform well.
1408 */
1409 static unsigned long ibmveth_get_desired_dma(struct vio_dev *vdev)
1410 {
1411 struct net_device *netdev = dev_get_drvdata(&vdev->dev);
1412 struct ibmveth_adapter *adapter;
1413 struct iommu_table *tbl;
1414 unsigned long ret;
1415 int i;
1416 int rxqentries = 1;
1417
1418 tbl = get_iommu_table_base(&vdev->dev);
1419
1420 /* netdev inits at probe time along with the structures we need below*/
1421 if (netdev == NULL)
1422 return IOMMU_PAGE_ALIGN(IBMVETH_IO_ENTITLEMENT_DEFAULT, tbl);
1423
1424 adapter = netdev_priv(netdev);
1425
1426 ret = IBMVETH_BUFF_LIST_SIZE + IBMVETH_FILT_LIST_SIZE;
1427 ret += IOMMU_PAGE_ALIGN(netdev->mtu, tbl);
1428
1429 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1430 /* add the size of the active receive buffers */
1431 if (adapter->rx_buff_pool[i].active)
1432 ret +=
1433 adapter->rx_buff_pool[i].size *
1434 IOMMU_PAGE_ALIGN(adapter->rx_buff_pool[i].
1435 buff_size, tbl);
1436 rxqentries += adapter->rx_buff_pool[i].size;
1437 }
1438 /* add the size of the receive queue entries */
1439 ret += IOMMU_PAGE_ALIGN(
1440 rxqentries * sizeof(struct ibmveth_rx_q_entry), tbl);
1441
1442 return ret;
1443 }
1444
1445 static int ibmveth_set_mac_addr(struct net_device *dev, void *p)
1446 {
1447 struct ibmveth_adapter *adapter = netdev_priv(dev);
1448 struct sockaddr *addr = p;
1449 u64 mac_address;
1450 int rc;
1451
1452 if (!is_valid_ether_addr(addr->sa_data))
1453 return -EADDRNOTAVAIL;
1454
1455 mac_address = ibmveth_encode_mac_addr(addr->sa_data);
1456 rc = h_change_logical_lan_mac(adapter->vdev->unit_address, mac_address);
1457 if (rc) {
1458 netdev_err(adapter->netdev, "h_change_logical_lan_mac failed with rc=%d\n", rc);
1459 return rc;
1460 }
1461
1462 ether_addr_copy(dev->dev_addr, addr->sa_data);
1463
1464 return 0;
1465 }
1466
1467 static const struct net_device_ops ibmveth_netdev_ops = {
1468 .ndo_open = ibmveth_open,
1469 .ndo_stop = ibmveth_close,
1470 .ndo_start_xmit = ibmveth_start_xmit,
1471 .ndo_set_rx_mode = ibmveth_set_multicast_list,
1472 .ndo_do_ioctl = ibmveth_ioctl,
1473 .ndo_change_mtu = ibmveth_change_mtu,
1474 .ndo_fix_features = ibmveth_fix_features,
1475 .ndo_set_features = ibmveth_set_features,
1476 .ndo_validate_addr = eth_validate_addr,
1477 .ndo_set_mac_address = ibmveth_set_mac_addr,
1478 #ifdef CONFIG_NET_POLL_CONTROLLER
1479 .ndo_poll_controller = ibmveth_poll_controller,
1480 #endif
1481 };
1482
1483 static int ibmveth_probe(struct vio_dev *dev, const struct vio_device_id *id)
1484 {
1485 int rc, i, mac_len;
1486 struct net_device *netdev;
1487 struct ibmveth_adapter *adapter;
1488 unsigned char *mac_addr_p;
1489 unsigned int *mcastFilterSize_p;
1490 long ret;
1491 unsigned long ret_attr;
1492
1493 dev_dbg(&dev->dev, "entering ibmveth_probe for UA 0x%x\n",
1494 dev->unit_address);
1495
1496 mac_addr_p = (unsigned char *)vio_get_attribute(dev, VETH_MAC_ADDR,
1497 &mac_len);
1498 if (!mac_addr_p) {
1499 dev_err(&dev->dev, "Can't find VETH_MAC_ADDR attribute\n");
1500 return -EINVAL;
1501 }
1502 /* Workaround for old/broken pHyp */
1503 if (mac_len == 8)
1504 mac_addr_p += 2;
1505 else if (mac_len != 6) {
1506 dev_err(&dev->dev, "VETH_MAC_ADDR attribute wrong len %d\n",
1507 mac_len);
1508 return -EINVAL;
1509 }
1510
1511 mcastFilterSize_p = (unsigned int *)vio_get_attribute(dev,
1512 VETH_MCAST_FILTER_SIZE, NULL);
1513 if (!mcastFilterSize_p) {
1514 dev_err(&dev->dev, "Can't find VETH_MCAST_FILTER_SIZE "
1515 "attribute\n");
1516 return -EINVAL;
1517 }
1518
1519 netdev = alloc_etherdev(sizeof(struct ibmveth_adapter));
1520
1521 if (!netdev)
1522 return -ENOMEM;
1523
1524 adapter = netdev_priv(netdev);
1525 dev_set_drvdata(&dev->dev, netdev);
1526
1527 adapter->vdev = dev;
1528 adapter->netdev = netdev;
1529 adapter->mcastFilterSize = *mcastFilterSize_p;
1530 adapter->pool_config = 0;
1531
1532 netif_napi_add(netdev, &adapter->napi, ibmveth_poll, 16);
1533
1534 netdev->irq = dev->irq;
1535 netdev->netdev_ops = &ibmveth_netdev_ops;
1536 netdev->ethtool_ops = &netdev_ethtool_ops;
1537 SET_NETDEV_DEV(netdev, &dev->dev);
1538 netdev->hw_features = NETIF_F_SG | NETIF_F_RXCSUM |
1539 NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;
1540
1541 netdev->features |= netdev->hw_features;
1542
1543 ret = h_illan_attributes(adapter->vdev->unit_address, 0, 0, &ret_attr);
1544
1545 /* If running older firmware, TSO should not be enabled by default */
1546 if (ret == H_SUCCESS && (ret_attr & IBMVETH_ILLAN_LRG_SND_SUPPORT) &&
1547 !old_large_send) {
1548 netdev->hw_features |= NETIF_F_TSO | NETIF_F_TSO6;
1549 netdev->features |= netdev->hw_features;
1550 } else {
1551 netdev->hw_features |= NETIF_F_TSO;
1552 }
1553
1554 memcpy(netdev->dev_addr, mac_addr_p, ETH_ALEN);
1555
1556 if (firmware_has_feature(FW_FEATURE_CMO))
1557 memcpy(pool_count, pool_count_cmo, sizeof(pool_count));
1558
1559 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1560 struct kobject *kobj = &adapter->rx_buff_pool[i].kobj;
1561 int error;
1562
1563 ibmveth_init_buffer_pool(&adapter->rx_buff_pool[i], i,
1564 pool_count[i], pool_size[i],
1565 pool_active[i]);
1566 error = kobject_init_and_add(kobj, &ktype_veth_pool,
1567 &dev->dev.kobj, "pool%d", i);
1568 if (!error)
1569 kobject_uevent(kobj, KOBJ_ADD);
1570 }
1571
1572 netdev_dbg(netdev, "adapter @ 0x%p\n", adapter);
1573
1574 adapter->buffer_list_dma = DMA_ERROR_CODE;
1575 adapter->filter_list_dma = DMA_ERROR_CODE;
1576 adapter->rx_queue.queue_dma = DMA_ERROR_CODE;
1577
1578 netdev_dbg(netdev, "registering netdev...\n");
1579
1580 ibmveth_set_features(netdev, netdev->features);
1581
1582 rc = register_netdev(netdev);
1583
1584 if (rc) {
1585 netdev_dbg(netdev, "failed to register netdev rc=%d\n", rc);
1586 free_netdev(netdev);
1587 return rc;
1588 }
1589
1590 netdev_dbg(netdev, "registered\n");
1591
1592 return 0;
1593 }
1594
1595 static int ibmveth_remove(struct vio_dev *dev)
1596 {
1597 struct net_device *netdev = dev_get_drvdata(&dev->dev);
1598 struct ibmveth_adapter *adapter = netdev_priv(netdev);
1599 int i;
1600
1601 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
1602 kobject_put(&adapter->rx_buff_pool[i].kobj);
1603
1604 unregister_netdev(netdev);
1605
1606 free_netdev(netdev);
1607 dev_set_drvdata(&dev->dev, NULL);
1608
1609 return 0;
1610 }
1611
1612 static struct attribute veth_active_attr;
1613 static struct attribute veth_num_attr;
1614 static struct attribute veth_size_attr;
1615
1616 static ssize_t veth_pool_show(struct kobject *kobj,
1617 struct attribute *attr, char *buf)
1618 {
1619 struct ibmveth_buff_pool *pool = container_of(kobj,
1620 struct ibmveth_buff_pool,
1621 kobj);
1622
1623 if (attr == &veth_active_attr)
1624 return sprintf(buf, "%d\n", pool->active);
1625 else if (attr == &veth_num_attr)
1626 return sprintf(buf, "%d\n", pool->size);
1627 else if (attr == &veth_size_attr)
1628 return sprintf(buf, "%d\n", pool->buff_size);
1629 return 0;
1630 }
1631
1632 static ssize_t veth_pool_store(struct kobject *kobj, struct attribute *attr,
1633 const char *buf, size_t count)
1634 {
1635 struct ibmveth_buff_pool *pool = container_of(kobj,
1636 struct ibmveth_buff_pool,
1637 kobj);
1638 struct net_device *netdev = dev_get_drvdata(
1639 container_of(kobj->parent, struct device, kobj));
1640 struct ibmveth_adapter *adapter = netdev_priv(netdev);
1641 long value = simple_strtol(buf, NULL, 10);
1642 long rc;
1643
1644 if (attr == &veth_active_attr) {
1645 if (value && !pool->active) {
1646 if (netif_running(netdev)) {
1647 if (ibmveth_alloc_buffer_pool(pool)) {
1648 netdev_err(netdev,
1649 "unable to alloc pool\n");
1650 return -ENOMEM;
1651 }
1652 pool->active = 1;
1653 adapter->pool_config = 1;
1654 ibmveth_close(netdev);
1655 adapter->pool_config = 0;
1656 if ((rc = ibmveth_open(netdev)))
1657 return rc;
1658 } else {
1659 pool->active = 1;
1660 }
1661 } else if (!value && pool->active) {
1662 int mtu = netdev->mtu + IBMVETH_BUFF_OH;
1663 int i;
1664 /* Make sure there is a buffer pool with buffers that
1665 can hold a packet of the size of the MTU */
1666 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1667 if (pool == &adapter->rx_buff_pool[i])
1668 continue;
1669 if (!adapter->rx_buff_pool[i].active)
1670 continue;
1671 if (mtu <= adapter->rx_buff_pool[i].buff_size)
1672 break;
1673 }
1674
1675 if (i == IBMVETH_NUM_BUFF_POOLS) {
1676 netdev_err(netdev, "no active pool >= MTU\n");
1677 return -EPERM;
1678 }
1679
1680 if (netif_running(netdev)) {
1681 adapter->pool_config = 1;
1682 ibmveth_close(netdev);
1683 pool->active = 0;
1684 adapter->pool_config = 0;
1685 if ((rc = ibmveth_open(netdev)))
1686 return rc;
1687 }
1688 pool->active = 0;
1689 }
1690 } else if (attr == &veth_num_attr) {
1691 if (value <= 0 || value > IBMVETH_MAX_POOL_COUNT) {
1692 return -EINVAL;
1693 } else {
1694 if (netif_running(netdev)) {
1695 adapter->pool_config = 1;
1696 ibmveth_close(netdev);
1697 adapter->pool_config = 0;
1698 pool->size = value;
1699 if ((rc = ibmveth_open(netdev)))
1700 return rc;
1701 } else {
1702 pool->size = value;
1703 }
1704 }
1705 } else if (attr == &veth_size_attr) {
1706 if (value <= IBMVETH_BUFF_OH || value > IBMVETH_MAX_BUF_SIZE) {
1707 return -EINVAL;
1708 } else {
1709 if (netif_running(netdev)) {
1710 adapter->pool_config = 1;
1711 ibmveth_close(netdev);
1712 adapter->pool_config = 0;
1713 pool->buff_size = value;
1714 if ((rc = ibmveth_open(netdev)))
1715 return rc;
1716 } else {
1717 pool->buff_size = value;
1718 }
1719 }
1720 }
1721
1722 /* kick the interrupt handler to allocate/deallocate pools */
1723 ibmveth_interrupt(netdev->irq, netdev);
1724 return count;
1725 }
1726
1727
1728 #define ATTR(_name, _mode) \
1729 struct attribute veth_##_name##_attr = { \
1730 .name = __stringify(_name), .mode = _mode, \
1731 };
1732
1733 static ATTR(active, 0644);
1734 static ATTR(num, 0644);
1735 static ATTR(size, 0644);
1736
1737 static struct attribute *veth_pool_attrs[] = {
1738 &veth_active_attr,
1739 &veth_num_attr,
1740 &veth_size_attr,
1741 NULL,
1742 };
1743
1744 static const struct sysfs_ops veth_pool_ops = {
1745 .show = veth_pool_show,
1746 .store = veth_pool_store,
1747 };
1748
1749 static struct kobj_type ktype_veth_pool = {
1750 .release = NULL,
1751 .sysfs_ops = &veth_pool_ops,
1752 .default_attrs = veth_pool_attrs,
1753 };
1754
1755 static int ibmveth_resume(struct device *dev)
1756 {
1757 struct net_device *netdev = dev_get_drvdata(dev);
1758 ibmveth_interrupt(netdev->irq, netdev);
1759 return 0;
1760 }
1761
1762 static struct vio_device_id ibmveth_device_table[] = {
1763 { "network", "IBM,l-lan"},
1764 { "", "" }
1765 };
1766 MODULE_DEVICE_TABLE(vio, ibmveth_device_table);
1767
1768 static struct dev_pm_ops ibmveth_pm_ops = {
1769 .resume = ibmveth_resume
1770 };
1771
1772 static struct vio_driver ibmveth_driver = {
1773 .id_table = ibmveth_device_table,
1774 .probe = ibmveth_probe,
1775 .remove = ibmveth_remove,
1776 .get_desired_dma = ibmveth_get_desired_dma,
1777 .name = ibmveth_driver_name,
1778 .pm = &ibmveth_pm_ops,
1779 };
1780
1781 static int __init ibmveth_module_init(void)
1782 {
1783 printk(KERN_DEBUG "%s: %s %s\n", ibmveth_driver_name,
1784 ibmveth_driver_string, ibmveth_driver_version);
1785
1786 return vio_register_driver(&ibmveth_driver);
1787 }
1788
1789 static void __exit ibmveth_module_exit(void)
1790 {
1791 vio_unregister_driver(&ibmveth_driver);
1792 }
1793
1794 module_init(ibmveth_module_init);
1795 module_exit(ibmveth_module_exit);
Linux kernel - Deliverables
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