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