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Merge tag 'v3.10.56' into update
[GitHub/mt8127/android_kernel_alcatel_ttab.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, write to the Free Software
16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
17 *
18 * Copyright (C) IBM Corporation, 2003, 2010
19 *
20 * Authors: Dave Larson <larson1@us.ibm.com>
21 * Santiago Leon <santil@linux.vnet.ibm.com>
22 * Brian King <brking@linux.vnet.ibm.com>
23 * Robert Jennings <rcj@linux.vnet.ibm.com>
24 * Anton Blanchard <anton@au.ibm.com>
25 */
26
27 #include <linux/module.h>
28 #include <linux/moduleparam.h>
29 #include <linux/types.h>
30 #include <linux/errno.h>
31 #include <linux/dma-mapping.h>
32 #include <linux/kernel.h>
33 #include <linux/netdevice.h>
34 #include <linux/etherdevice.h>
35 #include <linux/skbuff.h>
36 #include <linux/init.h>
37 #include <linux/interrupt.h>
38 #include <linux/mm.h>
39 #include <linux/pm.h>
40 #include <linux/ethtool.h>
41 #include <linux/in.h>
42 #include <linux/ip.h>
43 #include <linux/ipv6.h>
44 #include <linux/slab.h>
45 #include <asm/hvcall.h>
46 #include <linux/atomic.h>
47 #include <asm/vio.h>
48 #include <asm/iommu.h>
49 #include <asm/firmware.h>
50
51 #include "ibmveth.h"
52
53 static irqreturn_t ibmveth_interrupt(int irq, void *dev_instance);
54 static void ibmveth_rxq_harvest_buffer(struct ibmveth_adapter *adapter);
55 static unsigned long ibmveth_get_desired_dma(struct vio_dev *vdev);
56
57 static struct kobj_type ktype_veth_pool;
58
59
60 static const char ibmveth_driver_name[] = "ibmveth";
61 static const char ibmveth_driver_string[] = "IBM Power Virtual Ethernet Driver";
62 #define ibmveth_driver_version "1.04"
63
64 MODULE_AUTHOR("Santiago Leon <santil@linux.vnet.ibm.com>");
65 MODULE_DESCRIPTION("IBM Power Virtual Ethernet Driver");
66 MODULE_LICENSE("GPL");
67 MODULE_VERSION(ibmveth_driver_version);
68
69 static unsigned int tx_copybreak __read_mostly = 128;
70 module_param(tx_copybreak, uint, 0644);
71 MODULE_PARM_DESC(tx_copybreak,
72 "Maximum size of packet that is copied to a new buffer on transmit");
73
74 static unsigned int rx_copybreak __read_mostly = 128;
75 module_param(rx_copybreak, uint, 0644);
76 MODULE_PARM_DESC(rx_copybreak,
77 "Maximum size of packet that is copied to a new buffer on receive");
78
79 static unsigned int rx_flush __read_mostly = 0;
80 module_param(rx_flush, uint, 0644);
81 MODULE_PARM_DESC(rx_flush, "Flush receive buffers before use");
82
83 struct ibmveth_stat {
84 char name[ETH_GSTRING_LEN];
85 int offset;
86 };
87
88 #define IBMVETH_STAT_OFF(stat) offsetof(struct ibmveth_adapter, stat)
89 #define IBMVETH_GET_STAT(a, off) *((u64 *)(((unsigned long)(a)) + off))
90
91 struct ibmveth_stat ibmveth_stats[] = {
92 { "replenish_task_cycles", IBMVETH_STAT_OFF(replenish_task_cycles) },
93 { "replenish_no_mem", IBMVETH_STAT_OFF(replenish_no_mem) },
94 { "replenish_add_buff_failure",
95 IBMVETH_STAT_OFF(replenish_add_buff_failure) },
96 { "replenish_add_buff_success",
97 IBMVETH_STAT_OFF(replenish_add_buff_success) },
98 { "rx_invalid_buffer", IBMVETH_STAT_OFF(rx_invalid_buffer) },
99 { "rx_no_buffer", IBMVETH_STAT_OFF(rx_no_buffer) },
100 { "tx_map_failed", IBMVETH_STAT_OFF(tx_map_failed) },
101 { "tx_send_failed", IBMVETH_STAT_OFF(tx_send_failed) },
102 { "fw_enabled_ipv4_csum", IBMVETH_STAT_OFF(fw_ipv4_csum_support) },
103 { "fw_enabled_ipv6_csum", IBMVETH_STAT_OFF(fw_ipv6_csum_support) },
104 };
105
106 /* simple methods of getting data from the current rxq entry */
107 static inline u32 ibmveth_rxq_flags(struct ibmveth_adapter *adapter)
108 {
109 return adapter->rx_queue.queue_addr[adapter->rx_queue.index].flags_off;
110 }
111
112 static inline int ibmveth_rxq_toggle(struct ibmveth_adapter *adapter)
113 {
114 return (ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_TOGGLE) >>
115 IBMVETH_RXQ_TOGGLE_SHIFT;
116 }
117
118 static inline int ibmveth_rxq_pending_buffer(struct ibmveth_adapter *adapter)
119 {
120 return ibmveth_rxq_toggle(adapter) == adapter->rx_queue.toggle;
121 }
122
123 static inline int ibmveth_rxq_buffer_valid(struct ibmveth_adapter *adapter)
124 {
125 return ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_VALID;
126 }
127
128 static inline int ibmveth_rxq_frame_offset(struct ibmveth_adapter *adapter)
129 {
130 return ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_OFF_MASK;
131 }
132
133 static inline int ibmveth_rxq_frame_length(struct ibmveth_adapter *adapter)
134 {
135 return adapter->rx_queue.queue_addr[adapter->rx_queue.index].length;
136 }
137
138 static inline int ibmveth_rxq_csum_good(struct ibmveth_adapter *adapter)
139 {
140 return ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_CSUM_GOOD;
141 }
142
143 /* setup the initial settings for a buffer pool */
144 static void ibmveth_init_buffer_pool(struct ibmveth_buff_pool *pool,
145 u32 pool_index, u32 pool_size,
146 u32 buff_size, u32 pool_active)
147 {
148 pool->size = pool_size;
149 pool->index = pool_index;
150 pool->buff_size = buff_size;
151 pool->threshold = pool_size * 7 / 8;
152 pool->active = pool_active;
153 }
154
155 /* allocate and setup an buffer pool - called during open */
156 static int ibmveth_alloc_buffer_pool(struct ibmveth_buff_pool *pool)
157 {
158 int i;
159
160 pool->free_map = kmalloc(sizeof(u16) * pool->size, GFP_KERNEL);
161
162 if (!pool->free_map)
163 return -1;
164
165 pool->dma_addr = kmalloc(sizeof(dma_addr_t) * pool->size, GFP_KERNEL);
166 if (!pool->dma_addr) {
167 kfree(pool->free_map);
168 pool->free_map = NULL;
169 return -1;
170 }
171
172 pool->skbuff = kcalloc(pool->size, sizeof(void *), GFP_KERNEL);
173
174 if (!pool->skbuff) {
175 kfree(pool->dma_addr);
176 pool->dma_addr = NULL;
177
178 kfree(pool->free_map);
179 pool->free_map = NULL;
180 return -1;
181 }
182
183 memset(pool->dma_addr, 0, sizeof(dma_addr_t) * pool->size);
184
185 for (i = 0; i < pool->size; ++i)
186 pool->free_map[i] = i;
187
188 atomic_set(&pool->available, 0);
189 pool->producer_index = 0;
190 pool->consumer_index = 0;
191
192 return 0;
193 }
194
195 static inline void ibmveth_flush_buffer(void *addr, unsigned long length)
196 {
197 unsigned long offset;
198
199 for (offset = 0; offset < length; offset += SMP_CACHE_BYTES)
200 asm("dcbfl %0,%1" :: "b" (addr), "r" (offset));
201 }
202
203 /* replenish the buffers for a pool. note that we don't need to
204 * skb_reserve these since they are used for incoming...
205 */
206 static void ibmveth_replenish_buffer_pool(struct ibmveth_adapter *adapter,
207 struct ibmveth_buff_pool *pool)
208 {
209 u32 i;
210 u32 count = pool->size - atomic_read(&pool->available);
211 u32 buffers_added = 0;
212 struct sk_buff *skb;
213 unsigned int free_index, index;
214 u64 correlator;
215 unsigned long lpar_rc;
216 dma_addr_t dma_addr;
217
218 mb();
219
220 for (i = 0; i < count; ++i) {
221 union ibmveth_buf_desc desc;
222
223 skb = netdev_alloc_skb(adapter->netdev, pool->buff_size);
224
225 if (!skb) {
226 netdev_dbg(adapter->netdev,
227 "replenish: unable to allocate skb\n");
228 adapter->replenish_no_mem++;
229 break;
230 }
231
232 free_index = pool->consumer_index;
233 pool->consumer_index++;
234 if (pool->consumer_index >= pool->size)
235 pool->consumer_index = 0;
236 index = pool->free_map[free_index];
237
238 BUG_ON(index == IBM_VETH_INVALID_MAP);
239 BUG_ON(pool->skbuff[index] != NULL);
240
241 dma_addr = dma_map_single(&adapter->vdev->dev, skb->data,
242 pool->buff_size, DMA_FROM_DEVICE);
243
244 if (dma_mapping_error(&adapter->vdev->dev, dma_addr))
245 goto failure;
246
247 pool->free_map[free_index] = IBM_VETH_INVALID_MAP;
248 pool->dma_addr[index] = dma_addr;
249 pool->skbuff[index] = skb;
250
251 correlator = ((u64)pool->index << 32) | index;
252 *(u64 *)skb->data = correlator;
253
254 desc.fields.flags_len = IBMVETH_BUF_VALID | pool->buff_size;
255 desc.fields.address = dma_addr;
256
257 if (rx_flush) {
258 unsigned int len = min(pool->buff_size,
259 adapter->netdev->mtu +
260 IBMVETH_BUFF_OH);
261 ibmveth_flush_buffer(skb->data, len);
262 }
263 lpar_rc = h_add_logical_lan_buffer(adapter->vdev->unit_address,
264 desc.desc);
265
266 if (lpar_rc != H_SUCCESS) {
267 goto failure;
268 } else {
269 buffers_added++;
270 adapter->replenish_add_buff_success++;
271 }
272 }
273
274 mb();
275 atomic_add(buffers_added, &(pool->available));
276 return;
277
278 failure:
279 pool->free_map[free_index] = index;
280 pool->skbuff[index] = NULL;
281 if (pool->consumer_index == 0)
282 pool->consumer_index = pool->size - 1;
283 else
284 pool->consumer_index--;
285 if (!dma_mapping_error(&adapter->vdev->dev, dma_addr))
286 dma_unmap_single(&adapter->vdev->dev,
287 pool->dma_addr[index], pool->buff_size,
288 DMA_FROM_DEVICE);
289 dev_kfree_skb_any(skb);
290 adapter->replenish_add_buff_failure++;
291
292 mb();
293 atomic_add(buffers_added, &(pool->available));
294 }
295
296 /*
297 * The final 8 bytes of the buffer list is a counter of frames dropped
298 * because there was not a buffer in the buffer list capable of holding
299 * the frame.
300 */
301 static void ibmveth_update_rx_no_buffer(struct ibmveth_adapter *adapter)
302 {
303 __be64 *p = adapter->buffer_list_addr + 4096 - 8;
304
305 adapter->rx_no_buffer = be64_to_cpup(p);
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 ibmveth_update_rx_no_buffer(adapter);
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,
328 struct ibmveth_buff_pool *pool)
329 {
330 int i;
331
332 kfree(pool->free_map);
333 pool->free_map = NULL;
334
335 if (pool->skbuff && pool->dma_addr) {
336 for (i = 0; i < pool->size; ++i) {
337 struct sk_buff *skb = pool->skbuff[i];
338 if (skb) {
339 dma_unmap_single(&adapter->vdev->dev,
340 pool->dma_addr[i],
341 pool->buff_size,
342 DMA_FROM_DEVICE);
343 dev_kfree_skb_any(skb);
344 pool->skbuff[i] = NULL;
345 }
346 }
347 }
348
349 if (pool->dma_addr) {
350 kfree(pool->dma_addr);
351 pool->dma_addr = NULL;
352 }
353
354 if (pool->skbuff) {
355 kfree(pool->skbuff);
356 pool->skbuff = NULL;
357 }
358 }
359
360 /* remove a buffer from a pool */
361 static void ibmveth_remove_buffer_from_pool(struct ibmveth_adapter *adapter,
362 u64 correlator)
363 {
364 unsigned int pool = correlator >> 32;
365 unsigned int index = correlator & 0xffffffffUL;
366 unsigned int free_index;
367 struct sk_buff *skb;
368
369 BUG_ON(pool >= IBMVETH_NUM_BUFF_POOLS);
370 BUG_ON(index >= adapter->rx_buff_pool[pool].size);
371
372 skb = adapter->rx_buff_pool[pool].skbuff[index];
373
374 BUG_ON(skb == NULL);
375
376 adapter->rx_buff_pool[pool].skbuff[index] = NULL;
377
378 dma_unmap_single(&adapter->vdev->dev,
379 adapter->rx_buff_pool[pool].dma_addr[index],
380 adapter->rx_buff_pool[pool].buff_size,
381 DMA_FROM_DEVICE);
382
383 free_index = adapter->rx_buff_pool[pool].producer_index;
384 adapter->rx_buff_pool[pool].producer_index++;
385 if (adapter->rx_buff_pool[pool].producer_index >=
386 adapter->rx_buff_pool[pool].size)
387 adapter->rx_buff_pool[pool].producer_index = 0;
388 adapter->rx_buff_pool[pool].free_map[free_index] = index;
389
390 mb();
391
392 atomic_dec(&(adapter->rx_buff_pool[pool].available));
393 }
394
395 /* get the current buffer on the rx queue */
396 static inline struct sk_buff *ibmveth_rxq_get_buffer(struct ibmveth_adapter *adapter)
397 {
398 u64 correlator = adapter->rx_queue.queue_addr[adapter->rx_queue.index].correlator;
399 unsigned int pool = correlator >> 32;
400 unsigned int index = correlator & 0xffffffffUL;
401
402 BUG_ON(pool >= IBMVETH_NUM_BUFF_POOLS);
403 BUG_ON(index >= adapter->rx_buff_pool[pool].size);
404
405 return adapter->rx_buff_pool[pool].skbuff[index];
406 }
407
408 /* recycle the current buffer on the rx queue */
409 static int ibmveth_rxq_recycle_buffer(struct ibmveth_adapter *adapter)
410 {
411 u32 q_index = adapter->rx_queue.index;
412 u64 correlator = adapter->rx_queue.queue_addr[q_index].correlator;
413 unsigned int pool = correlator >> 32;
414 unsigned int index = correlator & 0xffffffffUL;
415 union ibmveth_buf_desc desc;
416 unsigned long lpar_rc;
417 int ret = 1;
418
419 BUG_ON(pool >= IBMVETH_NUM_BUFF_POOLS);
420 BUG_ON(index >= adapter->rx_buff_pool[pool].size);
421
422 if (!adapter->rx_buff_pool[pool].active) {
423 ibmveth_rxq_harvest_buffer(adapter);
424 ibmveth_free_buffer_pool(adapter, &adapter->rx_buff_pool[pool]);
425 goto out;
426 }
427
428 desc.fields.flags_len = IBMVETH_BUF_VALID |
429 adapter->rx_buff_pool[pool].buff_size;
430 desc.fields.address = adapter->rx_buff_pool[pool].dma_addr[index];
431
432 lpar_rc = h_add_logical_lan_buffer(adapter->vdev->unit_address, desc.desc);
433
434 if (lpar_rc != H_SUCCESS) {
435 netdev_dbg(adapter->netdev, "h_add_logical_lan_buffer failed "
436 "during recycle rc=%ld", lpar_rc);
437 ibmveth_remove_buffer_from_pool(adapter, adapter->rx_queue.queue_addr[adapter->rx_queue.index].correlator);
438 ret = 0;
439 }
440
441 if (++adapter->rx_queue.index == adapter->rx_queue.num_slots) {
442 adapter->rx_queue.index = 0;
443 adapter->rx_queue.toggle = !adapter->rx_queue.toggle;
444 }
445
446 out:
447 return ret;
448 }
449
450 static void ibmveth_rxq_harvest_buffer(struct ibmveth_adapter *adapter)
451 {
452 ibmveth_remove_buffer_from_pool(adapter, adapter->rx_queue.queue_addr[adapter->rx_queue.index].correlator);
453
454 if (++adapter->rx_queue.index == adapter->rx_queue.num_slots) {
455 adapter->rx_queue.index = 0;
456 adapter->rx_queue.toggle = !adapter->rx_queue.toggle;
457 }
458 }
459
460 static void ibmveth_cleanup(struct ibmveth_adapter *adapter)
461 {
462 int i;
463 struct device *dev = &adapter->vdev->dev;
464
465 if (adapter->buffer_list_addr != NULL) {
466 if (!dma_mapping_error(dev, adapter->buffer_list_dma)) {
467 dma_unmap_single(dev, adapter->buffer_list_dma, 4096,
468 DMA_BIDIRECTIONAL);
469 adapter->buffer_list_dma = DMA_ERROR_CODE;
470 }
471 free_page((unsigned long)adapter->buffer_list_addr);
472 adapter->buffer_list_addr = NULL;
473 }
474
475 if (adapter->filter_list_addr != NULL) {
476 if (!dma_mapping_error(dev, adapter->filter_list_dma)) {
477 dma_unmap_single(dev, adapter->filter_list_dma, 4096,
478 DMA_BIDIRECTIONAL);
479 adapter->filter_list_dma = DMA_ERROR_CODE;
480 }
481 free_page((unsigned long)adapter->filter_list_addr);
482 adapter->filter_list_addr = NULL;
483 }
484
485 if (adapter->rx_queue.queue_addr != NULL) {
486 dma_free_coherent(dev, adapter->rx_queue.queue_len,
487 adapter->rx_queue.queue_addr,
488 adapter->rx_queue.queue_dma);
489 adapter->rx_queue.queue_addr = NULL;
490 }
491
492 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
493 if (adapter->rx_buff_pool[i].active)
494 ibmveth_free_buffer_pool(adapter,
495 &adapter->rx_buff_pool[i]);
496
497 if (adapter->bounce_buffer != NULL) {
498 if (!dma_mapping_error(dev, adapter->bounce_buffer_dma)) {
499 dma_unmap_single(&adapter->vdev->dev,
500 adapter->bounce_buffer_dma,
501 adapter->netdev->mtu + IBMVETH_BUFF_OH,
502 DMA_BIDIRECTIONAL);
503 adapter->bounce_buffer_dma = DMA_ERROR_CODE;
504 }
505 kfree(adapter->bounce_buffer);
506 adapter->bounce_buffer = NULL;
507 }
508 }
509
510 static int ibmveth_register_logical_lan(struct ibmveth_adapter *adapter,
511 union ibmveth_buf_desc rxq_desc, u64 mac_address)
512 {
513 int rc, try_again = 1;
514
515 /*
516 * After a kexec the adapter will still be open, so our attempt to
517 * open it will fail. So if we get a failure we free the adapter and
518 * try again, but only once.
519 */
520 retry:
521 rc = h_register_logical_lan(adapter->vdev->unit_address,
522 adapter->buffer_list_dma, rxq_desc.desc,
523 adapter->filter_list_dma, mac_address);
524
525 if (rc != H_SUCCESS && try_again) {
526 do {
527 rc = h_free_logical_lan(adapter->vdev->unit_address);
528 } while (H_IS_LONG_BUSY(rc) || (rc == H_BUSY));
529
530 try_again = 0;
531 goto retry;
532 }
533
534 return rc;
535 }
536
537 static int ibmveth_open(struct net_device *netdev)
538 {
539 struct ibmveth_adapter *adapter = netdev_priv(netdev);
540 u64 mac_address = 0;
541 int rxq_entries = 1;
542 unsigned long lpar_rc;
543 int rc;
544 union ibmveth_buf_desc rxq_desc;
545 int i;
546 struct device *dev;
547
548 netdev_dbg(netdev, "open starting\n");
549
550 napi_enable(&adapter->napi);
551
552 for(i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
553 rxq_entries += adapter->rx_buff_pool[i].size;
554
555 adapter->buffer_list_addr = (void*) get_zeroed_page(GFP_KERNEL);
556 adapter->filter_list_addr = (void*) get_zeroed_page(GFP_KERNEL);
557
558 if (!adapter->buffer_list_addr || !adapter->filter_list_addr) {
559 netdev_err(netdev, "unable to allocate filter or buffer list "
560 "pages\n");
561 rc = -ENOMEM;
562 goto err_out;
563 }
564
565 dev = &adapter->vdev->dev;
566
567 adapter->rx_queue.queue_len = sizeof(struct ibmveth_rx_q_entry) *
568 rxq_entries;
569 adapter->rx_queue.queue_addr =
570 dma_alloc_coherent(dev, adapter->rx_queue.queue_len,
571 &adapter->rx_queue.queue_dma, GFP_KERNEL);
572 if (!adapter->rx_queue.queue_addr) {
573 rc = -ENOMEM;
574 goto err_out;
575 }
576
577 adapter->buffer_list_dma = dma_map_single(dev,
578 adapter->buffer_list_addr, 4096, DMA_BIDIRECTIONAL);
579 adapter->filter_list_dma = dma_map_single(dev,
580 adapter->filter_list_addr, 4096, DMA_BIDIRECTIONAL);
581
582 if ((dma_mapping_error(dev, adapter->buffer_list_dma)) ||
583 (dma_mapping_error(dev, adapter->filter_list_dma))) {
584 netdev_err(netdev, "unable to map filter or buffer list "
585 "pages\n");
586 rc = -ENOMEM;
587 goto err_out;
588 }
589
590 adapter->rx_queue.index = 0;
591 adapter->rx_queue.num_slots = rxq_entries;
592 adapter->rx_queue.toggle = 1;
593
594 memcpy(&mac_address, netdev->dev_addr, netdev->addr_len);
595 mac_address = mac_address >> 16;
596
597 rxq_desc.fields.flags_len = IBMVETH_BUF_VALID |
598 adapter->rx_queue.queue_len;
599 rxq_desc.fields.address = adapter->rx_queue.queue_dma;
600
601 netdev_dbg(netdev, "buffer list @ 0x%p\n", adapter->buffer_list_addr);
602 netdev_dbg(netdev, "filter list @ 0x%p\n", adapter->filter_list_addr);
603 netdev_dbg(netdev, "receive q @ 0x%p\n", adapter->rx_queue.queue_addr);
604
605 h_vio_signal(adapter->vdev->unit_address, VIO_IRQ_DISABLE);
606
607 lpar_rc = ibmveth_register_logical_lan(adapter, rxq_desc, mac_address);
608
609 if (lpar_rc != H_SUCCESS) {
610 netdev_err(netdev, "h_register_logical_lan failed with %ld\n",
611 lpar_rc);
612 netdev_err(netdev, "buffer TCE:0x%llx filter TCE:0x%llx rxq "
613 "desc:0x%llx MAC:0x%llx\n",
614 adapter->buffer_list_dma,
615 adapter->filter_list_dma,
616 rxq_desc.desc,
617 mac_address);
618 rc = -ENONET;
619 goto err_out;
620 }
621
622 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
623 if (!adapter->rx_buff_pool[i].active)
624 continue;
625 if (ibmveth_alloc_buffer_pool(&adapter->rx_buff_pool[i])) {
626 netdev_err(netdev, "unable to alloc pool\n");
627 adapter->rx_buff_pool[i].active = 0;
628 rc = -ENOMEM;
629 goto err_out;
630 }
631 }
632
633 netdev_dbg(netdev, "registering irq 0x%x\n", netdev->irq);
634 rc = request_irq(netdev->irq, ibmveth_interrupt, 0, netdev->name,
635 netdev);
636 if (rc != 0) {
637 netdev_err(netdev, "unable to request irq 0x%x, rc %d\n",
638 netdev->irq, rc);
639 do {
640 lpar_rc = h_free_logical_lan(adapter->vdev->unit_address);
641 } while (H_IS_LONG_BUSY(lpar_rc) || (lpar_rc == H_BUSY));
642
643 goto err_out;
644 }
645
646 adapter->bounce_buffer =
647 kmalloc(netdev->mtu + IBMVETH_BUFF_OH, GFP_KERNEL);
648 if (!adapter->bounce_buffer) {
649 rc = -ENOMEM;
650 goto err_out_free_irq;
651 }
652 adapter->bounce_buffer_dma =
653 dma_map_single(&adapter->vdev->dev, adapter->bounce_buffer,
654 netdev->mtu + IBMVETH_BUFF_OH, DMA_BIDIRECTIONAL);
655 if (dma_mapping_error(dev, adapter->bounce_buffer_dma)) {
656 netdev_err(netdev, "unable to map bounce buffer\n");
657 rc = -ENOMEM;
658 goto err_out_free_irq;
659 }
660
661 netdev_dbg(netdev, "initial replenish cycle\n");
662 ibmveth_interrupt(netdev->irq, netdev);
663
664 netif_start_queue(netdev);
665
666 netdev_dbg(netdev, "open complete\n");
667
668 return 0;
669
670 err_out_free_irq:
671 free_irq(netdev->irq, netdev);
672 err_out:
673 ibmveth_cleanup(adapter);
674 napi_disable(&adapter->napi);
675 return rc;
676 }
677
678 static int ibmveth_close(struct net_device *netdev)
679 {
680 struct ibmveth_adapter *adapter = netdev_priv(netdev);
681 long lpar_rc;
682
683 netdev_dbg(netdev, "close starting\n");
684
685 napi_disable(&adapter->napi);
686
687 if (!adapter->pool_config)
688 netif_stop_queue(netdev);
689
690 h_vio_signal(adapter->vdev->unit_address, VIO_IRQ_DISABLE);
691
692 do {
693 lpar_rc = h_free_logical_lan(adapter->vdev->unit_address);
694 } while (H_IS_LONG_BUSY(lpar_rc) || (lpar_rc == H_BUSY));
695
696 if (lpar_rc != H_SUCCESS) {
697 netdev_err(netdev, "h_free_logical_lan failed with %lx, "
698 "continuing with close\n", lpar_rc);
699 }
700
701 free_irq(netdev->irq, netdev);
702
703 ibmveth_update_rx_no_buffer(adapter);
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 {
714 cmd->supported = (SUPPORTED_1000baseT_Full | SUPPORTED_Autoneg |
715 SUPPORTED_FIBRE);
716 cmd->advertising = (ADVERTISED_1000baseT_Full | ADVERTISED_Autoneg |
717 ADVERTISED_FIBRE);
718 ethtool_cmd_speed_set(cmd, SPEED_1000);
719 cmd->duplex = DUPLEX_FULL;
720 cmd->port = PORT_FIBRE;
721 cmd->phy_address = 0;
722 cmd->transceiver = XCVR_INTERNAL;
723 cmd->autoneg = AUTONEG_ENABLE;
724 cmd->maxtxpkt = 0;
725 cmd->maxrxpkt = 1;
726 return 0;
727 }
728
729 static void netdev_get_drvinfo(struct net_device *dev,
730 struct ethtool_drvinfo *info)
731 {
732 strlcpy(info->driver, ibmveth_driver_name, sizeof(info->driver));
733 strlcpy(info->version, ibmveth_driver_version, sizeof(info->version));
734 }
735
736 static netdev_features_t ibmveth_fix_features(struct net_device *dev,
737 netdev_features_t features)
738 {
739 /*
740 * Since the ibmveth firmware interface does not have the
741 * concept of separate tx/rx checksum offload enable, if rx
742 * checksum is disabled we also have to disable tx checksum
743 * offload. Once we disable rx checksum offload, we are no
744 * longer allowed to send tx buffers that are not properly
745 * checksummed.
746 */
747
748 if (!(features & NETIF_F_RXCSUM))
749 features &= ~NETIF_F_ALL_CSUM;
750
751 return features;
752 }
753
754 static int ibmveth_set_csum_offload(struct net_device *dev, u32 data)
755 {
756 struct ibmveth_adapter *adapter = netdev_priv(dev);
757 unsigned long set_attr, clr_attr, ret_attr;
758 unsigned long set_attr6, clr_attr6;
759 long ret, ret4, ret6;
760 int rc1 = 0, rc2 = 0;
761 int restart = 0;
762
763 if (netif_running(dev)) {
764 restart = 1;
765 adapter->pool_config = 1;
766 ibmveth_close(dev);
767 adapter->pool_config = 0;
768 }
769
770 set_attr = 0;
771 clr_attr = 0;
772 set_attr6 = 0;
773 clr_attr6 = 0;
774
775 if (data) {
776 set_attr = IBMVETH_ILLAN_IPV4_TCP_CSUM;
777 set_attr6 = IBMVETH_ILLAN_IPV6_TCP_CSUM;
778 } else {
779 clr_attr = IBMVETH_ILLAN_IPV4_TCP_CSUM;
780 clr_attr6 = IBMVETH_ILLAN_IPV6_TCP_CSUM;
781 }
782
783 ret = h_illan_attributes(adapter->vdev->unit_address, 0, 0, &ret_attr);
784
785 if (ret == H_SUCCESS && !(ret_attr & IBMVETH_ILLAN_ACTIVE_TRUNK) &&
786 !(ret_attr & IBMVETH_ILLAN_TRUNK_PRI_MASK) &&
787 (ret_attr & IBMVETH_ILLAN_PADDED_PKT_CSUM)) {
788 ret4 = h_illan_attributes(adapter->vdev->unit_address, clr_attr,
789 set_attr, &ret_attr);
790
791 if (ret4 != H_SUCCESS) {
792 netdev_err(dev, "unable to change IPv4 checksum "
793 "offload settings. %d rc=%ld\n",
794 data, ret4);
795
796 h_illan_attributes(adapter->vdev->unit_address,
797 set_attr, clr_attr, &ret_attr);
798
799 if (data == 1)
800 dev->features &= ~NETIF_F_IP_CSUM;
801
802 } else {
803 adapter->fw_ipv4_csum_support = data;
804 }
805
806 ret6 = h_illan_attributes(adapter->vdev->unit_address,
807 clr_attr6, set_attr6, &ret_attr);
808
809 if (ret6 != H_SUCCESS) {
810 netdev_err(dev, "unable to change IPv6 checksum "
811 "offload settings. %d rc=%ld\n",
812 data, ret6);
813
814 h_illan_attributes(adapter->vdev->unit_address,
815 set_attr6, clr_attr6, &ret_attr);
816
817 if (data == 1)
818 dev->features &= ~NETIF_F_IPV6_CSUM;
819
820 } else
821 adapter->fw_ipv6_csum_support = data;
822
823 if (ret4 == H_SUCCESS || ret6 == H_SUCCESS)
824 adapter->rx_csum = data;
825 else
826 rc1 = -EIO;
827 } else {
828 rc1 = -EIO;
829 netdev_err(dev, "unable to change checksum offload settings."
830 " %d rc=%ld ret_attr=%lx\n", data, ret,
831 ret_attr);
832 }
833
834 if (restart)
835 rc2 = ibmveth_open(dev);
836
837 return rc1 ? rc1 : rc2;
838 }
839
840 static int ibmveth_set_features(struct net_device *dev,
841 netdev_features_t features)
842 {
843 struct ibmveth_adapter *adapter = netdev_priv(dev);
844 int rx_csum = !!(features & NETIF_F_RXCSUM);
845 int rc;
846
847 if (rx_csum == adapter->rx_csum)
848 return 0;
849
850 rc = ibmveth_set_csum_offload(dev, rx_csum);
851 if (rc && !adapter->rx_csum)
852 dev->features = features & ~(NETIF_F_ALL_CSUM | NETIF_F_RXCSUM);
853
854 return rc;
855 }
856
857 static void ibmveth_get_strings(struct net_device *dev, u32 stringset, u8 *data)
858 {
859 int i;
860
861 if (stringset != ETH_SS_STATS)
862 return;
863
864 for (i = 0; i < ARRAY_SIZE(ibmveth_stats); i++, data += ETH_GSTRING_LEN)
865 memcpy(data, ibmveth_stats[i].name, ETH_GSTRING_LEN);
866 }
867
868 static int ibmveth_get_sset_count(struct net_device *dev, int sset)
869 {
870 switch (sset) {
871 case ETH_SS_STATS:
872 return ARRAY_SIZE(ibmveth_stats);
873 default:
874 return -EOPNOTSUPP;
875 }
876 }
877
878 static void ibmveth_get_ethtool_stats(struct net_device *dev,
879 struct ethtool_stats *stats, u64 *data)
880 {
881 int i;
882 struct ibmveth_adapter *adapter = netdev_priv(dev);
883
884 for (i = 0; i < ARRAY_SIZE(ibmveth_stats); i++)
885 data[i] = IBMVETH_GET_STAT(adapter, ibmveth_stats[i].offset);
886 }
887
888 static const struct ethtool_ops netdev_ethtool_ops = {
889 .get_drvinfo = netdev_get_drvinfo,
890 .get_settings = netdev_get_settings,
891 .get_link = ethtool_op_get_link,
892 .get_strings = ibmveth_get_strings,
893 .get_sset_count = ibmveth_get_sset_count,
894 .get_ethtool_stats = ibmveth_get_ethtool_stats,
895 };
896
897 static int ibmveth_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
898 {
899 return -EOPNOTSUPP;
900 }
901
902 #define page_offset(v) ((unsigned long)(v) & ((1 << 12) - 1))
903
904 static int ibmveth_send(struct ibmveth_adapter *adapter,
905 union ibmveth_buf_desc *descs)
906 {
907 unsigned long correlator;
908 unsigned int retry_count;
909 unsigned long ret;
910
911 /*
912 * The retry count sets a maximum for the number of broadcast and
913 * multicast destinations within the system.
914 */
915 retry_count = 1024;
916 correlator = 0;
917 do {
918 ret = h_send_logical_lan(adapter->vdev->unit_address,
919 descs[0].desc, descs[1].desc,
920 descs[2].desc, descs[3].desc,
921 descs[4].desc, descs[5].desc,
922 correlator, &correlator);
923 } while ((ret == H_BUSY) && (retry_count--));
924
925 if (ret != H_SUCCESS && ret != H_DROPPED) {
926 netdev_err(adapter->netdev, "tx: h_send_logical_lan failed "
927 "with rc=%ld\n", ret);
928 return 1;
929 }
930
931 return 0;
932 }
933
934 static netdev_tx_t ibmveth_start_xmit(struct sk_buff *skb,
935 struct net_device *netdev)
936 {
937 struct ibmveth_adapter *adapter = netdev_priv(netdev);
938 unsigned int desc_flags;
939 union ibmveth_buf_desc descs[6];
940 int last, i;
941 int force_bounce = 0;
942 dma_addr_t dma_addr;
943
944 /*
945 * veth handles a maximum of 6 segments including the header, so
946 * we have to linearize the skb if there are more than this.
947 */
948 if (skb_shinfo(skb)->nr_frags > 5 && __skb_linearize(skb)) {
949 netdev->stats.tx_dropped++;
950 goto out;
951 }
952
953 /* veth can't checksum offload UDP */
954 if (skb->ip_summed == CHECKSUM_PARTIAL &&
955 ((skb->protocol == htons(ETH_P_IP) &&
956 ip_hdr(skb)->protocol != IPPROTO_TCP) ||
957 (skb->protocol == htons(ETH_P_IPV6) &&
958 ipv6_hdr(skb)->nexthdr != IPPROTO_TCP)) &&
959 skb_checksum_help(skb)) {
960
961 netdev_err(netdev, "tx: failed to checksum packet\n");
962 netdev->stats.tx_dropped++;
963 goto out;
964 }
965
966 desc_flags = IBMVETH_BUF_VALID;
967
968 if (skb->ip_summed == CHECKSUM_PARTIAL) {
969 unsigned char *buf = skb_transport_header(skb) +
970 skb->csum_offset;
971
972 desc_flags |= (IBMVETH_BUF_NO_CSUM | IBMVETH_BUF_CSUM_GOOD);
973
974 /* Need to zero out the checksum */
975 buf[0] = 0;
976 buf[1] = 0;
977 }
978
979 retry_bounce:
980 memset(descs, 0, sizeof(descs));
981
982 /*
983 * If a linear packet is below the rx threshold then
984 * copy it into the static bounce buffer. This avoids the
985 * cost of a TCE insert and remove.
986 */
987 if (force_bounce || (!skb_is_nonlinear(skb) &&
988 (skb->len < tx_copybreak))) {
989 skb_copy_from_linear_data(skb, adapter->bounce_buffer,
990 skb->len);
991
992 descs[0].fields.flags_len = desc_flags | skb->len;
993 descs[0].fields.address = adapter->bounce_buffer_dma;
994
995 if (ibmveth_send(adapter, descs)) {
996 adapter->tx_send_failed++;
997 netdev->stats.tx_dropped++;
998 } else {
999 netdev->stats.tx_packets++;
1000 netdev->stats.tx_bytes += skb->len;
1001 }
1002
1003 goto out;
1004 }
1005
1006 /* Map the header */
1007 dma_addr = dma_map_single(&adapter->vdev->dev, skb->data,
1008 skb_headlen(skb), DMA_TO_DEVICE);
1009 if (dma_mapping_error(&adapter->vdev->dev, dma_addr))
1010 goto map_failed;
1011
1012 descs[0].fields.flags_len = desc_flags | skb_headlen(skb);
1013 descs[0].fields.address = dma_addr;
1014
1015 /* Map the frags */
1016 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1017 const skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1018
1019 dma_addr = skb_frag_dma_map(&adapter->vdev->dev, frag, 0,
1020 skb_frag_size(frag), DMA_TO_DEVICE);
1021
1022 if (dma_mapping_error(&adapter->vdev->dev, dma_addr))
1023 goto map_failed_frags;
1024
1025 descs[i+1].fields.flags_len = desc_flags | skb_frag_size(frag);
1026 descs[i+1].fields.address = dma_addr;
1027 }
1028
1029 if (ibmveth_send(adapter, descs)) {
1030 adapter->tx_send_failed++;
1031 netdev->stats.tx_dropped++;
1032 } else {
1033 netdev->stats.tx_packets++;
1034 netdev->stats.tx_bytes += skb->len;
1035 }
1036
1037 dma_unmap_single(&adapter->vdev->dev,
1038 descs[0].fields.address,
1039 descs[0].fields.flags_len & IBMVETH_BUF_LEN_MASK,
1040 DMA_TO_DEVICE);
1041
1042 for (i = 1; i < skb_shinfo(skb)->nr_frags + 1; i++)
1043 dma_unmap_page(&adapter->vdev->dev, descs[i].fields.address,
1044 descs[i].fields.flags_len & IBMVETH_BUF_LEN_MASK,
1045 DMA_TO_DEVICE);
1046
1047 out:
1048 dev_kfree_skb(skb);
1049 return NETDEV_TX_OK;
1050
1051 map_failed_frags:
1052 last = i+1;
1053 for (i = 0; i < last; i++)
1054 dma_unmap_page(&adapter->vdev->dev, descs[i].fields.address,
1055 descs[i].fields.flags_len & IBMVETH_BUF_LEN_MASK,
1056 DMA_TO_DEVICE);
1057
1058 map_failed:
1059 if (!firmware_has_feature(FW_FEATURE_CMO))
1060 netdev_err(netdev, "tx: unable to map xmit buffer\n");
1061 adapter->tx_map_failed++;
1062 skb_linearize(skb);
1063 force_bounce = 1;
1064 goto retry_bounce;
1065 }
1066
1067 static int ibmveth_poll(struct napi_struct *napi, int budget)
1068 {
1069 struct ibmveth_adapter *adapter =
1070 container_of(napi, struct ibmveth_adapter, napi);
1071 struct net_device *netdev = adapter->netdev;
1072 int frames_processed = 0;
1073 unsigned long lpar_rc;
1074
1075 restart_poll:
1076 do {
1077 if (!ibmveth_rxq_pending_buffer(adapter))
1078 break;
1079
1080 smp_rmb();
1081 if (!ibmveth_rxq_buffer_valid(adapter)) {
1082 wmb(); /* suggested by larson1 */
1083 adapter->rx_invalid_buffer++;
1084 netdev_dbg(netdev, "recycling invalid buffer\n");
1085 ibmveth_rxq_recycle_buffer(adapter);
1086 } else {
1087 struct sk_buff *skb, *new_skb;
1088 int length = ibmveth_rxq_frame_length(adapter);
1089 int offset = ibmveth_rxq_frame_offset(adapter);
1090 int csum_good = ibmveth_rxq_csum_good(adapter);
1091
1092 skb = ibmveth_rxq_get_buffer(adapter);
1093
1094 new_skb = NULL;
1095 if (length < rx_copybreak)
1096 new_skb = netdev_alloc_skb(netdev, length);
1097
1098 if (new_skb) {
1099 skb_copy_to_linear_data(new_skb,
1100 skb->data + offset,
1101 length);
1102 if (rx_flush)
1103 ibmveth_flush_buffer(skb->data,
1104 length + offset);
1105 if (!ibmveth_rxq_recycle_buffer(adapter))
1106 kfree_skb(skb);
1107 skb = new_skb;
1108 } else {
1109 ibmveth_rxq_harvest_buffer(adapter);
1110 skb_reserve(skb, offset);
1111 }
1112
1113 skb_put(skb, length);
1114 skb->protocol = eth_type_trans(skb, netdev);
1115
1116 if (csum_good)
1117 skb->ip_summed = CHECKSUM_UNNECESSARY;
1118
1119 netif_receive_skb(skb); /* send it up */
1120
1121 netdev->stats.rx_packets++;
1122 netdev->stats.rx_bytes += length;
1123 frames_processed++;
1124 }
1125 } while (frames_processed < budget);
1126
1127 ibmveth_replenish_task(adapter);
1128
1129 if (frames_processed < budget) {
1130 /* We think we are done - reenable interrupts,
1131 * then check once more to make sure we are done.
1132 */
1133 lpar_rc = h_vio_signal(adapter->vdev->unit_address,
1134 VIO_IRQ_ENABLE);
1135
1136 BUG_ON(lpar_rc != H_SUCCESS);
1137
1138 napi_complete(napi);
1139
1140 if (ibmveth_rxq_pending_buffer(adapter) &&
1141 napi_reschedule(napi)) {
1142 lpar_rc = h_vio_signal(adapter->vdev->unit_address,
1143 VIO_IRQ_DISABLE);
1144 goto restart_poll;
1145 }
1146 }
1147
1148 return frames_processed;
1149 }
1150
1151 static irqreturn_t ibmveth_interrupt(int irq, void *dev_instance)
1152 {
1153 struct net_device *netdev = dev_instance;
1154 struct ibmveth_adapter *adapter = netdev_priv(netdev);
1155 unsigned long lpar_rc;
1156
1157 if (napi_schedule_prep(&adapter->napi)) {
1158 lpar_rc = h_vio_signal(adapter->vdev->unit_address,
1159 VIO_IRQ_DISABLE);
1160 BUG_ON(lpar_rc != H_SUCCESS);
1161 __napi_schedule(&adapter->napi);
1162 }
1163 return IRQ_HANDLED;
1164 }
1165
1166 static void ibmveth_set_multicast_list(struct net_device *netdev)
1167 {
1168 struct ibmveth_adapter *adapter = netdev_priv(netdev);
1169 unsigned long lpar_rc;
1170
1171 if ((netdev->flags & IFF_PROMISC) ||
1172 (netdev_mc_count(netdev) > adapter->mcastFilterSize)) {
1173 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1174 IbmVethMcastEnableRecv |
1175 IbmVethMcastDisableFiltering,
1176 0);
1177 if (lpar_rc != H_SUCCESS) {
1178 netdev_err(netdev, "h_multicast_ctrl rc=%ld when "
1179 "entering promisc mode\n", lpar_rc);
1180 }
1181 } else {
1182 struct netdev_hw_addr *ha;
1183 /* clear the filter table & disable filtering */
1184 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1185 IbmVethMcastEnableRecv |
1186 IbmVethMcastDisableFiltering |
1187 IbmVethMcastClearFilterTable,
1188 0);
1189 if (lpar_rc != H_SUCCESS) {
1190 netdev_err(netdev, "h_multicast_ctrl rc=%ld when "
1191 "attempting to clear filter table\n",
1192 lpar_rc);
1193 }
1194 /* add the addresses to the filter table */
1195 netdev_for_each_mc_addr(ha, netdev) {
1196 /* add the multicast address to the filter table */
1197 unsigned long mcast_addr = 0;
1198 memcpy(((char *)&mcast_addr)+2, ha->addr, 6);
1199 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1200 IbmVethMcastAddFilter,
1201 mcast_addr);
1202 if (lpar_rc != H_SUCCESS) {
1203 netdev_err(netdev, "h_multicast_ctrl rc=%ld "
1204 "when adding an entry to the filter "
1205 "table\n", lpar_rc);
1206 }
1207 }
1208
1209 /* re-enable filtering */
1210 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1211 IbmVethMcastEnableFiltering,
1212 0);
1213 if (lpar_rc != H_SUCCESS) {
1214 netdev_err(netdev, "h_multicast_ctrl rc=%ld when "
1215 "enabling filtering\n", lpar_rc);
1216 }
1217 }
1218 }
1219
1220 static int ibmveth_change_mtu(struct net_device *dev, int new_mtu)
1221 {
1222 struct ibmveth_adapter *adapter = netdev_priv(dev);
1223 struct vio_dev *viodev = adapter->vdev;
1224 int new_mtu_oh = new_mtu + IBMVETH_BUFF_OH;
1225 int i, rc;
1226 int need_restart = 0;
1227
1228 if (new_mtu < IBMVETH_MIN_MTU)
1229 return -EINVAL;
1230
1231 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
1232 if (new_mtu_oh < adapter->rx_buff_pool[i].buff_size)
1233 break;
1234
1235 if (i == IBMVETH_NUM_BUFF_POOLS)
1236 return -EINVAL;
1237
1238 /* Deactivate all the buffer pools so that the next loop can activate
1239 only the buffer pools necessary to hold the new MTU */
1240 if (netif_running(adapter->netdev)) {
1241 need_restart = 1;
1242 adapter->pool_config = 1;
1243 ibmveth_close(adapter->netdev);
1244 adapter->pool_config = 0;
1245 }
1246
1247 /* Look for an active buffer pool that can hold the new MTU */
1248 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1249 adapter->rx_buff_pool[i].active = 1;
1250
1251 if (new_mtu_oh < adapter->rx_buff_pool[i].buff_size) {
1252 dev->mtu = new_mtu;
1253 vio_cmo_set_dev_desired(viodev,
1254 ibmveth_get_desired_dma
1255 (viodev));
1256 if (need_restart) {
1257 return ibmveth_open(adapter->netdev);
1258 }
1259 return 0;
1260 }
1261 }
1262
1263 if (need_restart && (rc = ibmveth_open(adapter->netdev)))
1264 return rc;
1265
1266 return -EINVAL;
1267 }
1268
1269 #ifdef CONFIG_NET_POLL_CONTROLLER
1270 static void ibmveth_poll_controller(struct net_device *dev)
1271 {
1272 ibmveth_replenish_task(netdev_priv(dev));
1273 ibmveth_interrupt(dev->irq, dev);
1274 }
1275 #endif
1276
1277 /**
1278 * ibmveth_get_desired_dma - Calculate IO memory desired by the driver
1279 *
1280 * @vdev: struct vio_dev for the device whose desired IO mem is to be returned
1281 *
1282 * Return value:
1283 * Number of bytes of IO data the driver will need to perform well.
1284 */
1285 static unsigned long ibmveth_get_desired_dma(struct vio_dev *vdev)
1286 {
1287 struct net_device *netdev = dev_get_drvdata(&vdev->dev);
1288 struct ibmveth_adapter *adapter;
1289 unsigned long ret;
1290 int i;
1291 int rxqentries = 1;
1292
1293 /* netdev inits at probe time along with the structures we need below*/
1294 if (netdev == NULL)
1295 return IOMMU_PAGE_ALIGN(IBMVETH_IO_ENTITLEMENT_DEFAULT);
1296
1297 adapter = netdev_priv(netdev);
1298
1299 ret = IBMVETH_BUFF_LIST_SIZE + IBMVETH_FILT_LIST_SIZE;
1300 ret += IOMMU_PAGE_ALIGN(netdev->mtu);
1301
1302 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1303 /* add the size of the active receive buffers */
1304 if (adapter->rx_buff_pool[i].active)
1305 ret +=
1306 adapter->rx_buff_pool[i].size *
1307 IOMMU_PAGE_ALIGN(adapter->rx_buff_pool[i].
1308 buff_size);
1309 rxqentries += adapter->rx_buff_pool[i].size;
1310 }
1311 /* add the size of the receive queue entries */
1312 ret += IOMMU_PAGE_ALIGN(rxqentries * sizeof(struct ibmveth_rx_q_entry));
1313
1314 return ret;
1315 }
1316
1317 static const struct net_device_ops ibmveth_netdev_ops = {
1318 .ndo_open = ibmveth_open,
1319 .ndo_stop = ibmveth_close,
1320 .ndo_start_xmit = ibmveth_start_xmit,
1321 .ndo_set_rx_mode = ibmveth_set_multicast_list,
1322 .ndo_do_ioctl = ibmveth_ioctl,
1323 .ndo_change_mtu = ibmveth_change_mtu,
1324 .ndo_fix_features = ibmveth_fix_features,
1325 .ndo_set_features = ibmveth_set_features,
1326 .ndo_validate_addr = eth_validate_addr,
1327 .ndo_set_mac_address = eth_mac_addr,
1328 #ifdef CONFIG_NET_POLL_CONTROLLER
1329 .ndo_poll_controller = ibmveth_poll_controller,
1330 #endif
1331 };
1332
1333 static int ibmveth_probe(struct vio_dev *dev, const struct vio_device_id *id)
1334 {
1335 int rc, i, mac_len;
1336 struct net_device *netdev;
1337 struct ibmveth_adapter *adapter;
1338 unsigned char *mac_addr_p;
1339 unsigned int *mcastFilterSize_p;
1340
1341 dev_dbg(&dev->dev, "entering ibmveth_probe for UA 0x%x\n",
1342 dev->unit_address);
1343
1344 mac_addr_p = (unsigned char *)vio_get_attribute(dev, VETH_MAC_ADDR,
1345 &mac_len);
1346 if (!mac_addr_p) {
1347 dev_err(&dev->dev, "Can't find VETH_MAC_ADDR attribute\n");
1348 return -EINVAL;
1349 }
1350 /* Workaround for old/broken pHyp */
1351 if (mac_len == 8)
1352 mac_addr_p += 2;
1353 else if (mac_len != 6) {
1354 dev_err(&dev->dev, "VETH_MAC_ADDR attribute wrong len %d\n",
1355 mac_len);
1356 return -EINVAL;
1357 }
1358
1359 mcastFilterSize_p = (unsigned int *)vio_get_attribute(dev,
1360 VETH_MCAST_FILTER_SIZE, NULL);
1361 if (!mcastFilterSize_p) {
1362 dev_err(&dev->dev, "Can't find VETH_MCAST_FILTER_SIZE "
1363 "attribute\n");
1364 return -EINVAL;
1365 }
1366
1367 netdev = alloc_etherdev(sizeof(struct ibmveth_adapter));
1368
1369 if (!netdev)
1370 return -ENOMEM;
1371
1372 adapter = netdev_priv(netdev);
1373 dev_set_drvdata(&dev->dev, netdev);
1374
1375 adapter->vdev = dev;
1376 adapter->netdev = netdev;
1377 adapter->mcastFilterSize = *mcastFilterSize_p;
1378 adapter->pool_config = 0;
1379
1380 netif_napi_add(netdev, &adapter->napi, ibmveth_poll, 16);
1381
1382 adapter->mac_addr = 0;
1383 memcpy(&adapter->mac_addr, mac_addr_p, 6);
1384
1385 netdev->irq = dev->irq;
1386 netdev->netdev_ops = &ibmveth_netdev_ops;
1387 netdev->ethtool_ops = &netdev_ethtool_ops;
1388 SET_NETDEV_DEV(netdev, &dev->dev);
1389 netdev->hw_features = NETIF_F_SG | NETIF_F_RXCSUM |
1390 NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;
1391 netdev->features |= netdev->hw_features;
1392
1393 memcpy(netdev->dev_addr, &adapter->mac_addr, netdev->addr_len);
1394
1395 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1396 struct kobject *kobj = &adapter->rx_buff_pool[i].kobj;
1397 int error;
1398
1399 ibmveth_init_buffer_pool(&adapter->rx_buff_pool[i], i,
1400 pool_count[i], pool_size[i],
1401 pool_active[i]);
1402 error = kobject_init_and_add(kobj, &ktype_veth_pool,
1403 &dev->dev.kobj, "pool%d", i);
1404 if (!error)
1405 kobject_uevent(kobj, KOBJ_ADD);
1406 }
1407
1408 netdev_dbg(netdev, "adapter @ 0x%p\n", adapter);
1409
1410 adapter->buffer_list_dma = DMA_ERROR_CODE;
1411 adapter->filter_list_dma = DMA_ERROR_CODE;
1412 adapter->rx_queue.queue_dma = DMA_ERROR_CODE;
1413
1414 netdev_dbg(netdev, "registering netdev...\n");
1415
1416 ibmveth_set_features(netdev, netdev->features);
1417
1418 rc = register_netdev(netdev);
1419
1420 if (rc) {
1421 netdev_dbg(netdev, "failed to register netdev rc=%d\n", rc);
1422 free_netdev(netdev);
1423 return rc;
1424 }
1425
1426 netdev_dbg(netdev, "registered\n");
1427
1428 return 0;
1429 }
1430
1431 static int ibmveth_remove(struct vio_dev *dev)
1432 {
1433 struct net_device *netdev = dev_get_drvdata(&dev->dev);
1434 struct ibmveth_adapter *adapter = netdev_priv(netdev);
1435 int i;
1436
1437 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
1438 kobject_put(&adapter->rx_buff_pool[i].kobj);
1439
1440 unregister_netdev(netdev);
1441
1442 free_netdev(netdev);
1443 dev_set_drvdata(&dev->dev, NULL);
1444
1445 return 0;
1446 }
1447
1448 static struct attribute veth_active_attr;
1449 static struct attribute veth_num_attr;
1450 static struct attribute veth_size_attr;
1451
1452 static ssize_t veth_pool_show(struct kobject *kobj,
1453 struct attribute *attr, char *buf)
1454 {
1455 struct ibmveth_buff_pool *pool = container_of(kobj,
1456 struct ibmveth_buff_pool,
1457 kobj);
1458
1459 if (attr == &veth_active_attr)
1460 return sprintf(buf, "%d\n", pool->active);
1461 else if (attr == &veth_num_attr)
1462 return sprintf(buf, "%d\n", pool->size);
1463 else if (attr == &veth_size_attr)
1464 return sprintf(buf, "%d\n", pool->buff_size);
1465 return 0;
1466 }
1467
1468 static ssize_t veth_pool_store(struct kobject *kobj, struct attribute *attr,
1469 const char *buf, size_t count)
1470 {
1471 struct ibmveth_buff_pool *pool = container_of(kobj,
1472 struct ibmveth_buff_pool,
1473 kobj);
1474 struct net_device *netdev = dev_get_drvdata(
1475 container_of(kobj->parent, struct device, kobj));
1476 struct ibmveth_adapter *adapter = netdev_priv(netdev);
1477 long value = simple_strtol(buf, NULL, 10);
1478 long rc;
1479
1480 if (attr == &veth_active_attr) {
1481 if (value && !pool->active) {
1482 if (netif_running(netdev)) {
1483 if (ibmveth_alloc_buffer_pool(pool)) {
1484 netdev_err(netdev,
1485 "unable to alloc pool\n");
1486 return -ENOMEM;
1487 }
1488 pool->active = 1;
1489 adapter->pool_config = 1;
1490 ibmveth_close(netdev);
1491 adapter->pool_config = 0;
1492 if ((rc = ibmveth_open(netdev)))
1493 return rc;
1494 } else {
1495 pool->active = 1;
1496 }
1497 } else if (!value && pool->active) {
1498 int mtu = netdev->mtu + IBMVETH_BUFF_OH;
1499 int i;
1500 /* Make sure there is a buffer pool with buffers that
1501 can hold a packet of the size of the MTU */
1502 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1503 if (pool == &adapter->rx_buff_pool[i])
1504 continue;
1505 if (!adapter->rx_buff_pool[i].active)
1506 continue;
1507 if (mtu <= adapter->rx_buff_pool[i].buff_size)
1508 break;
1509 }
1510
1511 if (i == IBMVETH_NUM_BUFF_POOLS) {
1512 netdev_err(netdev, "no active pool >= MTU\n");
1513 return -EPERM;
1514 }
1515
1516 if (netif_running(netdev)) {
1517 adapter->pool_config = 1;
1518 ibmveth_close(netdev);
1519 pool->active = 0;
1520 adapter->pool_config = 0;
1521 if ((rc = ibmveth_open(netdev)))
1522 return rc;
1523 }
1524 pool->active = 0;
1525 }
1526 } else if (attr == &veth_num_attr) {
1527 if (value <= 0 || value > IBMVETH_MAX_POOL_COUNT) {
1528 return -EINVAL;
1529 } else {
1530 if (netif_running(netdev)) {
1531 adapter->pool_config = 1;
1532 ibmveth_close(netdev);
1533 adapter->pool_config = 0;
1534 pool->size = value;
1535 if ((rc = ibmveth_open(netdev)))
1536 return rc;
1537 } else {
1538 pool->size = value;
1539 }
1540 }
1541 } else if (attr == &veth_size_attr) {
1542 if (value <= IBMVETH_BUFF_OH || value > IBMVETH_MAX_BUF_SIZE) {
1543 return -EINVAL;
1544 } else {
1545 if (netif_running(netdev)) {
1546 adapter->pool_config = 1;
1547 ibmveth_close(netdev);
1548 adapter->pool_config = 0;
1549 pool->buff_size = value;
1550 if ((rc = ibmveth_open(netdev)))
1551 return rc;
1552 } else {
1553 pool->buff_size = value;
1554 }
1555 }
1556 }
1557
1558 /* kick the interrupt handler to allocate/deallocate pools */
1559 ibmveth_interrupt(netdev->irq, netdev);
1560 return count;
1561 }
1562
1563
1564 #define ATTR(_name, _mode) \
1565 struct attribute veth_##_name##_attr = { \
1566 .name = __stringify(_name), .mode = _mode, \
1567 };
1568
1569 static ATTR(active, 0644);
1570 static ATTR(num, 0644);
1571 static ATTR(size, 0644);
1572
1573 static struct attribute *veth_pool_attrs[] = {
1574 &veth_active_attr,
1575 &veth_num_attr,
1576 &veth_size_attr,
1577 NULL,
1578 };
1579
1580 static const struct sysfs_ops veth_pool_ops = {
1581 .show = veth_pool_show,
1582 .store = veth_pool_store,
1583 };
1584
1585 static struct kobj_type ktype_veth_pool = {
1586 .release = NULL,
1587 .sysfs_ops = &veth_pool_ops,
1588 .default_attrs = veth_pool_attrs,
1589 };
1590
1591 static int ibmveth_resume(struct device *dev)
1592 {
1593 struct net_device *netdev = dev_get_drvdata(dev);
1594 ibmveth_interrupt(netdev->irq, netdev);
1595 return 0;
1596 }
1597
1598 static struct vio_device_id ibmveth_device_table[] = {
1599 { "network", "IBM,l-lan"},
1600 { "", "" }
1601 };
1602 MODULE_DEVICE_TABLE(vio, ibmveth_device_table);
1603
1604 static struct dev_pm_ops ibmveth_pm_ops = {
1605 .resume = ibmveth_resume
1606 };
1607
1608 static struct vio_driver ibmveth_driver = {
1609 .id_table = ibmveth_device_table,
1610 .probe = ibmveth_probe,
1611 .remove = ibmveth_remove,
1612 .get_desired_dma = ibmveth_get_desired_dma,
1613 .name = ibmveth_driver_name,
1614 .pm = &ibmveth_pm_ops,
1615 };
1616
1617 static int __init ibmveth_module_init(void)
1618 {
1619 printk(KERN_DEBUG "%s: %s %s\n", ibmveth_driver_name,
1620 ibmveth_driver_string, ibmveth_driver_version);
1621
1622 return vio_register_driver(&ibmveth_driver);
1623 }
1624
1625 static void __exit ibmveth_module_exit(void)
1626 {
1627 vio_unregister_driver(&ibmveth_driver);
1628 }
1629
1630 module_init(ibmveth_module_init);
1631 module_exit(ibmveth_module_exit);
kernel source for telekom puls (alcatel/mediatek)