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[mirror_ubuntu-jammy-kernel.git] / drivers / net / ethernet / ibm / ibmveth.c
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * IBM Power Virtual Ethernet Device Driver
4 *
5 * Copyright (C) IBM Corporation, 2003, 2010
6 *
7 * Authors: Dave Larson <larson1@us.ibm.com>
8 * Santiago Leon <santil@linux.vnet.ibm.com>
9 * Brian King <brking@linux.vnet.ibm.com>
10 * Robert Jennings <rcj@linux.vnet.ibm.com>
11 * Anton Blanchard <anton@au.ibm.com>
12 */
13
14 #include <linux/module.h>
15 #include <linux/types.h>
16 #include <linux/errno.h>
17 #include <linux/dma-mapping.h>
18 #include <linux/kernel.h>
19 #include <linux/netdevice.h>
20 #include <linux/etherdevice.h>
21 #include <linux/skbuff.h>
22 #include <linux/init.h>
23 #include <linux/interrupt.h>
24 #include <linux/mm.h>
25 #include <linux/pm.h>
26 #include <linux/ethtool.h>
27 #include <linux/in.h>
28 #include <linux/ip.h>
29 #include <linux/ipv6.h>
30 #include <linux/slab.h>
31 #include <asm/hvcall.h>
32 #include <linux/atomic.h>
33 #include <asm/vio.h>
34 #include <asm/iommu.h>
35 #include <asm/firmware.h>
36 #include <net/tcp.h>
37 #include <net/ip6_checksum.h>
38
39 #include "ibmveth.h"
40
41 static irqreturn_t ibmveth_interrupt(int irq, void *dev_instance);
42 static void ibmveth_rxq_harvest_buffer(struct ibmveth_adapter *adapter);
43 static unsigned long ibmveth_get_desired_dma(struct vio_dev *vdev);
44
45 static struct kobj_type ktype_veth_pool;
46
47
48 static const char ibmveth_driver_name[] = "ibmveth";
49 static const char ibmveth_driver_string[] = "IBM Power Virtual Ethernet Driver";
50 #define ibmveth_driver_version "1.06"
51
52 MODULE_AUTHOR("Santiago Leon <santil@linux.vnet.ibm.com>");
53 MODULE_DESCRIPTION("IBM Power Virtual Ethernet Driver");
54 MODULE_LICENSE("GPL");
55 MODULE_VERSION(ibmveth_driver_version);
56
57 static unsigned int tx_copybreak __read_mostly = 128;
58 module_param(tx_copybreak, uint, 0644);
59 MODULE_PARM_DESC(tx_copybreak,
60 "Maximum size of packet that is copied to a new buffer on transmit");
61
62 static unsigned int rx_copybreak __read_mostly = 128;
63 module_param(rx_copybreak, uint, 0644);
64 MODULE_PARM_DESC(rx_copybreak,
65 "Maximum size of packet that is copied to a new buffer on receive");
66
67 static unsigned int rx_flush __read_mostly = 0;
68 module_param(rx_flush, uint, 0644);
69 MODULE_PARM_DESC(rx_flush, "Flush receive buffers before use");
70
71 static bool old_large_send __read_mostly;
72 module_param(old_large_send, bool, 0444);
73 MODULE_PARM_DESC(old_large_send,
74 "Use old large send method on firmware that supports the new method");
75
76 struct ibmveth_stat {
77 char name[ETH_GSTRING_LEN];
78 int offset;
79 };
80
81 #define IBMVETH_STAT_OFF(stat) offsetof(struct ibmveth_adapter, stat)
82 #define IBMVETH_GET_STAT(a, off) *((u64 *)(((unsigned long)(a)) + off))
83
84 static struct ibmveth_stat ibmveth_stats[] = {
85 { "replenish_task_cycles", IBMVETH_STAT_OFF(replenish_task_cycles) },
86 { "replenish_no_mem", IBMVETH_STAT_OFF(replenish_no_mem) },
87 { "replenish_add_buff_failure",
88 IBMVETH_STAT_OFF(replenish_add_buff_failure) },
89 { "replenish_add_buff_success",
90 IBMVETH_STAT_OFF(replenish_add_buff_success) },
91 { "rx_invalid_buffer", IBMVETH_STAT_OFF(rx_invalid_buffer) },
92 { "rx_no_buffer", IBMVETH_STAT_OFF(rx_no_buffer) },
93 { "tx_map_failed", IBMVETH_STAT_OFF(tx_map_failed) },
94 { "tx_send_failed", IBMVETH_STAT_OFF(tx_send_failed) },
95 { "fw_enabled_ipv4_csum", IBMVETH_STAT_OFF(fw_ipv4_csum_support) },
96 { "fw_enabled_ipv6_csum", IBMVETH_STAT_OFF(fw_ipv6_csum_support) },
97 { "tx_large_packets", IBMVETH_STAT_OFF(tx_large_packets) },
98 { "rx_large_packets", IBMVETH_STAT_OFF(rx_large_packets) },
99 { "fw_enabled_large_send", IBMVETH_STAT_OFF(fw_large_send_support) }
100 };
101
102 /* simple methods of getting data from the current rxq entry */
103 static inline u32 ibmveth_rxq_flags(struct ibmveth_adapter *adapter)
104 {
105 return be32_to_cpu(adapter->rx_queue.queue_addr[adapter->rx_queue.index].flags_off);
106 }
107
108 static inline int ibmveth_rxq_toggle(struct ibmveth_adapter *adapter)
109 {
110 return (ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_TOGGLE) >>
111 IBMVETH_RXQ_TOGGLE_SHIFT;
112 }
113
114 static inline int ibmveth_rxq_pending_buffer(struct ibmveth_adapter *adapter)
115 {
116 return ibmveth_rxq_toggle(adapter) == adapter->rx_queue.toggle;
117 }
118
119 static inline int ibmveth_rxq_buffer_valid(struct ibmveth_adapter *adapter)
120 {
121 return ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_VALID;
122 }
123
124 static inline int ibmveth_rxq_frame_offset(struct ibmveth_adapter *adapter)
125 {
126 return ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_OFF_MASK;
127 }
128
129 static inline int ibmveth_rxq_large_packet(struct ibmveth_adapter *adapter)
130 {
131 return ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_LRG_PKT;
132 }
133
134 static inline int ibmveth_rxq_frame_length(struct ibmveth_adapter *adapter)
135 {
136 return be32_to_cpu(adapter->rx_queue.queue_addr[adapter->rx_queue.index].length);
137 }
138
139 static inline int ibmveth_rxq_csum_good(struct ibmveth_adapter *adapter)
140 {
141 return ibmveth_rxq_flags(adapter) & IBMVETH_RXQ_CSUM_GOOD;
142 }
143
144 /* setup the initial settings for a buffer pool */
145 static void ibmveth_init_buffer_pool(struct ibmveth_buff_pool *pool,
146 u32 pool_index, u32 pool_size,
147 u32 buff_size, u32 pool_active)
148 {
149 pool->size = pool_size;
150 pool->index = pool_index;
151 pool->buff_size = buff_size;
152 pool->threshold = pool_size * 7 / 8;
153 pool->active = pool_active;
154 }
155
156 /* allocate and setup an buffer pool - called during open */
157 static int ibmveth_alloc_buffer_pool(struct ibmveth_buff_pool *pool)
158 {
159 int i;
160
161 pool->free_map = kmalloc_array(pool->size, sizeof(u16), GFP_KERNEL);
162
163 if (!pool->free_map)
164 return -1;
165
166 pool->dma_addr = kcalloc(pool->size, sizeof(dma_addr_t), GFP_KERNEL);
167 if (!pool->dma_addr) {
168 kfree(pool->free_map);
169 pool->free_map = NULL;
170 return -1;
171 }
172
173 pool->skbuff = kcalloc(pool->size, sizeof(void *), GFP_KERNEL);
174
175 if (!pool->skbuff) {
176 kfree(pool->dma_addr);
177 pool->dma_addr = NULL;
178
179 kfree(pool->free_map);
180 pool->free_map = NULL;
181 return -1;
182 }
183
184 for (i = 0; i < pool->size; ++i)
185 pool->free_map[i] = i;
186
187 atomic_set(&pool->available, 0);
188 pool->producer_index = 0;
189 pool->consumer_index = 0;
190
191 return 0;
192 }
193
194 static inline void ibmveth_flush_buffer(void *addr, unsigned long length)
195 {
196 unsigned long offset;
197
198 for (offset = 0; offset < length; offset += SMP_CACHE_BYTES)
199 asm("dcbfl %0,%1" :: "b" (addr), "r" (offset));
200 }
201
202 /* replenish the buffers for a pool. note that we don't need to
203 * skb_reserve these since they are used for incoming...
204 */
205 static void ibmveth_replenish_buffer_pool(struct ibmveth_adapter *adapter,
206 struct ibmveth_buff_pool *pool)
207 {
208 u32 i;
209 u32 count = pool->size - atomic_read(&pool->available);
210 u32 buffers_added = 0;
211 struct sk_buff *skb;
212 unsigned int free_index, index;
213 u64 correlator;
214 unsigned long lpar_rc;
215 dma_addr_t dma_addr;
216
217 mb();
218
219 for (i = 0; i < count; ++i) {
220 union ibmveth_buf_desc desc;
221
222 skb = netdev_alloc_skb(adapter->netdev, pool->buff_size);
223
224 if (!skb) {
225 netdev_dbg(adapter->netdev,
226 "replenish: unable to allocate skb\n");
227 adapter->replenish_no_mem++;
228 break;
229 }
230
231 free_index = pool->consumer_index;
232 pool->consumer_index++;
233 if (pool->consumer_index >= pool->size)
234 pool->consumer_index = 0;
235 index = pool->free_map[free_index];
236
237 BUG_ON(index == IBM_VETH_INVALID_MAP);
238 BUG_ON(pool->skbuff[index] != NULL);
239
240 dma_addr = dma_map_single(&adapter->vdev->dev, skb->data,
241 pool->buff_size, DMA_FROM_DEVICE);
242
243 if (dma_mapping_error(&adapter->vdev->dev, dma_addr))
244 goto failure;
245
246 pool->free_map[free_index] = IBM_VETH_INVALID_MAP;
247 pool->dma_addr[index] = dma_addr;
248 pool->skbuff[index] = skb;
249
250 correlator = ((u64)pool->index << 32) | index;
251 *(u64 *)skb->data = correlator;
252
253 desc.fields.flags_len = IBMVETH_BUF_VALID | pool->buff_size;
254 desc.fields.address = dma_addr;
255
256 if (rx_flush) {
257 unsigned int len = min(pool->buff_size,
258 adapter->netdev->mtu +
259 IBMVETH_BUFF_OH);
260 ibmveth_flush_buffer(skb->data, len);
261 }
262 lpar_rc = h_add_logical_lan_buffer(adapter->vdev->unit_address,
263 desc.desc);
264
265 if (lpar_rc != H_SUCCESS) {
266 goto failure;
267 } else {
268 buffers_added++;
269 adapter->replenish_add_buff_success++;
270 }
271 }
272
273 mb();
274 atomic_add(buffers_added, &(pool->available));
275 return;
276
277 failure:
278 pool->free_map[free_index] = index;
279 pool->skbuff[index] = NULL;
280 if (pool->consumer_index == 0)
281 pool->consumer_index = pool->size - 1;
282 else
283 pool->consumer_index--;
284 if (!dma_mapping_error(&adapter->vdev->dev, dma_addr))
285 dma_unmap_single(&adapter->vdev->dev,
286 pool->dma_addr[index], pool->buff_size,
287 DMA_FROM_DEVICE);
288 dev_kfree_skb_any(skb);
289 adapter->replenish_add_buff_failure++;
290
291 mb();
292 atomic_add(buffers_added, &(pool->available));
293 }
294
295 /*
296 * The final 8 bytes of the buffer list is a counter of frames dropped
297 * because there was not a buffer in the buffer list capable of holding
298 * the frame.
299 */
300 static void ibmveth_update_rx_no_buffer(struct ibmveth_adapter *adapter)
301 {
302 __be64 *p = adapter->buffer_list_addr + 4096 - 8;
303
304 adapter->rx_no_buffer = be64_to_cpup(p);
305 }
306
307 /* replenish routine */
308 static void ibmveth_replenish_task(struct ibmveth_adapter *adapter)
309 {
310 int i;
311
312 adapter->replenish_task_cycles++;
313
314 for (i = (IBMVETH_NUM_BUFF_POOLS - 1); i >= 0; i--) {
315 struct ibmveth_buff_pool *pool = &adapter->rx_buff_pool[i];
316
317 if (pool->active &&
318 (atomic_read(&pool->available) < pool->threshold))
319 ibmveth_replenish_buffer_pool(adapter, pool);
320 }
321
322 ibmveth_update_rx_no_buffer(adapter);
323 }
324
325 /* empty and free ana buffer pool - also used to do cleanup in error paths */
326 static void ibmveth_free_buffer_pool(struct ibmveth_adapter *adapter,
327 struct ibmveth_buff_pool *pool)
328 {
329 int i;
330
331 kfree(pool->free_map);
332 pool->free_map = NULL;
333
334 if (pool->skbuff && pool->dma_addr) {
335 for (i = 0; i < pool->size; ++i) {
336 struct sk_buff *skb = pool->skbuff[i];
337 if (skb) {
338 dma_unmap_single(&adapter->vdev->dev,
339 pool->dma_addr[i],
340 pool->buff_size,
341 DMA_FROM_DEVICE);
342 dev_kfree_skb_any(skb);
343 pool->skbuff[i] = NULL;
344 }
345 }
346 }
347
348 if (pool->dma_addr) {
349 kfree(pool->dma_addr);
350 pool->dma_addr = NULL;
351 }
352
353 if (pool->skbuff) {
354 kfree(pool->skbuff);
355 pool->skbuff = NULL;
356 }
357 }
358
359 /* remove a buffer from a pool */
360 static void ibmveth_remove_buffer_from_pool(struct ibmveth_adapter *adapter,
361 u64 correlator)
362 {
363 unsigned int pool = correlator >> 32;
364 unsigned int index = correlator & 0xffffffffUL;
365 unsigned int free_index;
366 struct sk_buff *skb;
367
368 BUG_ON(pool >= IBMVETH_NUM_BUFF_POOLS);
369 BUG_ON(index >= adapter->rx_buff_pool[pool].size);
370
371 skb = adapter->rx_buff_pool[pool].skbuff[index];
372
373 BUG_ON(skb == NULL);
374
375 adapter->rx_buff_pool[pool].skbuff[index] = NULL;
376
377 dma_unmap_single(&adapter->vdev->dev,
378 adapter->rx_buff_pool[pool].dma_addr[index],
379 adapter->rx_buff_pool[pool].buff_size,
380 DMA_FROM_DEVICE);
381
382 free_index = adapter->rx_buff_pool[pool].producer_index;
383 adapter->rx_buff_pool[pool].producer_index++;
384 if (adapter->rx_buff_pool[pool].producer_index >=
385 adapter->rx_buff_pool[pool].size)
386 adapter->rx_buff_pool[pool].producer_index = 0;
387 adapter->rx_buff_pool[pool].free_map[free_index] = index;
388
389 mb();
390
391 atomic_dec(&(adapter->rx_buff_pool[pool].available));
392 }
393
394 /* get the current buffer on the rx queue */
395 static inline struct sk_buff *ibmveth_rxq_get_buffer(struct ibmveth_adapter *adapter)
396 {
397 u64 correlator = adapter->rx_queue.queue_addr[adapter->rx_queue.index].correlator;
398 unsigned int pool = correlator >> 32;
399 unsigned int index = correlator & 0xffffffffUL;
400
401 BUG_ON(pool >= IBMVETH_NUM_BUFF_POOLS);
402 BUG_ON(index >= adapter->rx_buff_pool[pool].size);
403
404 return adapter->rx_buff_pool[pool].skbuff[index];
405 }
406
407 /* recycle the current buffer on the rx queue */
408 static int ibmveth_rxq_recycle_buffer(struct ibmveth_adapter *adapter)
409 {
410 u32 q_index = adapter->rx_queue.index;
411 u64 correlator = adapter->rx_queue.queue_addr[q_index].correlator;
412 unsigned int pool = correlator >> 32;
413 unsigned int index = correlator & 0xffffffffUL;
414 union ibmveth_buf_desc desc;
415 unsigned long lpar_rc;
416 int ret = 1;
417
418 BUG_ON(pool >= IBMVETH_NUM_BUFF_POOLS);
419 BUG_ON(index >= adapter->rx_buff_pool[pool].size);
420
421 if (!adapter->rx_buff_pool[pool].active) {
422 ibmveth_rxq_harvest_buffer(adapter);
423 ibmveth_free_buffer_pool(adapter, &adapter->rx_buff_pool[pool]);
424 goto out;
425 }
426
427 desc.fields.flags_len = IBMVETH_BUF_VALID |
428 adapter->rx_buff_pool[pool].buff_size;
429 desc.fields.address = adapter->rx_buff_pool[pool].dma_addr[index];
430
431 lpar_rc = h_add_logical_lan_buffer(adapter->vdev->unit_address, desc.desc);
432
433 if (lpar_rc != H_SUCCESS) {
434 netdev_dbg(adapter->netdev, "h_add_logical_lan_buffer failed "
435 "during recycle rc=%ld", lpar_rc);
436 ibmveth_remove_buffer_from_pool(adapter, adapter->rx_queue.queue_addr[adapter->rx_queue.index].correlator);
437 ret = 0;
438 }
439
440 if (++adapter->rx_queue.index == adapter->rx_queue.num_slots) {
441 adapter->rx_queue.index = 0;
442 adapter->rx_queue.toggle = !adapter->rx_queue.toggle;
443 }
444
445 out:
446 return ret;
447 }
448
449 static void ibmveth_rxq_harvest_buffer(struct ibmveth_adapter *adapter)
450 {
451 ibmveth_remove_buffer_from_pool(adapter, adapter->rx_queue.queue_addr[adapter->rx_queue.index].correlator);
452
453 if (++adapter->rx_queue.index == adapter->rx_queue.num_slots) {
454 adapter->rx_queue.index = 0;
455 adapter->rx_queue.toggle = !adapter->rx_queue.toggle;
456 }
457 }
458
459 static int ibmveth_register_logical_lan(struct ibmveth_adapter *adapter,
460 union ibmveth_buf_desc rxq_desc, u64 mac_address)
461 {
462 int rc, try_again = 1;
463
464 /*
465 * After a kexec the adapter will still be open, so our attempt to
466 * open it will fail. So if we get a failure we free the adapter and
467 * try again, but only once.
468 */
469 retry:
470 rc = h_register_logical_lan(adapter->vdev->unit_address,
471 adapter->buffer_list_dma, rxq_desc.desc,
472 adapter->filter_list_dma, mac_address);
473
474 if (rc != H_SUCCESS && try_again) {
475 do {
476 rc = h_free_logical_lan(adapter->vdev->unit_address);
477 } while (H_IS_LONG_BUSY(rc) || (rc == H_BUSY));
478
479 try_again = 0;
480 goto retry;
481 }
482
483 return rc;
484 }
485
486 static u64 ibmveth_encode_mac_addr(u8 *mac)
487 {
488 int i;
489 u64 encoded = 0;
490
491 for (i = 0; i < ETH_ALEN; i++)
492 encoded = (encoded << 8) | mac[i];
493
494 return encoded;
495 }
496
497 static int ibmveth_open(struct net_device *netdev)
498 {
499 struct ibmveth_adapter *adapter = netdev_priv(netdev);
500 u64 mac_address;
501 int rxq_entries = 1;
502 unsigned long lpar_rc;
503 int rc;
504 union ibmveth_buf_desc rxq_desc;
505 int i;
506 struct device *dev;
507
508 netdev_dbg(netdev, "open starting\n");
509
510 napi_enable(&adapter->napi);
511
512 for(i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
513 rxq_entries += adapter->rx_buff_pool[i].size;
514
515 rc = -ENOMEM;
516 adapter->buffer_list_addr = (void*) get_zeroed_page(GFP_KERNEL);
517 if (!adapter->buffer_list_addr) {
518 netdev_err(netdev, "unable to allocate list pages\n");
519 goto out;
520 }
521
522 adapter->filter_list_addr = (void*) get_zeroed_page(GFP_KERNEL);
523 if (!adapter->filter_list_addr) {
524 netdev_err(netdev, "unable to allocate filter pages\n");
525 goto out_free_buffer_list;
526 }
527
528 dev = &adapter->vdev->dev;
529
530 adapter->rx_queue.queue_len = sizeof(struct ibmveth_rx_q_entry) *
531 rxq_entries;
532 adapter->rx_queue.queue_addr =
533 dma_alloc_coherent(dev, adapter->rx_queue.queue_len,
534 &adapter->rx_queue.queue_dma, GFP_KERNEL);
535 if (!adapter->rx_queue.queue_addr)
536 goto out_free_filter_list;
537
538 adapter->buffer_list_dma = dma_map_single(dev,
539 adapter->buffer_list_addr, 4096, DMA_BIDIRECTIONAL);
540 if (dma_mapping_error(dev, adapter->buffer_list_dma)) {
541 netdev_err(netdev, "unable to map buffer list pages\n");
542 goto out_free_queue_mem;
543 }
544
545 adapter->filter_list_dma = dma_map_single(dev,
546 adapter->filter_list_addr, 4096, DMA_BIDIRECTIONAL);
547 if (dma_mapping_error(dev, adapter->filter_list_dma)) {
548 netdev_err(netdev, "unable to map filter list pages\n");
549 goto out_unmap_buffer_list;
550 }
551
552 adapter->rx_queue.index = 0;
553 adapter->rx_queue.num_slots = rxq_entries;
554 adapter->rx_queue.toggle = 1;
555
556 mac_address = ibmveth_encode_mac_addr(netdev->dev_addr);
557
558 rxq_desc.fields.flags_len = IBMVETH_BUF_VALID |
559 adapter->rx_queue.queue_len;
560 rxq_desc.fields.address = adapter->rx_queue.queue_dma;
561
562 netdev_dbg(netdev, "buffer list @ 0x%p\n", adapter->buffer_list_addr);
563 netdev_dbg(netdev, "filter list @ 0x%p\n", adapter->filter_list_addr);
564 netdev_dbg(netdev, "receive q @ 0x%p\n", adapter->rx_queue.queue_addr);
565
566 h_vio_signal(adapter->vdev->unit_address, VIO_IRQ_DISABLE);
567
568 lpar_rc = ibmveth_register_logical_lan(adapter, rxq_desc, mac_address);
569
570 if (lpar_rc != H_SUCCESS) {
571 netdev_err(netdev, "h_register_logical_lan failed with %ld\n",
572 lpar_rc);
573 netdev_err(netdev, "buffer TCE:0x%llx filter TCE:0x%llx rxq "
574 "desc:0x%llx MAC:0x%llx\n",
575 adapter->buffer_list_dma,
576 adapter->filter_list_dma,
577 rxq_desc.desc,
578 mac_address);
579 rc = -ENONET;
580 goto out_unmap_filter_list;
581 }
582
583 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
584 if (!adapter->rx_buff_pool[i].active)
585 continue;
586 if (ibmveth_alloc_buffer_pool(&adapter->rx_buff_pool[i])) {
587 netdev_err(netdev, "unable to alloc pool\n");
588 adapter->rx_buff_pool[i].active = 0;
589 rc = -ENOMEM;
590 goto out_free_buffer_pools;
591 }
592 }
593
594 netdev_dbg(netdev, "registering irq 0x%x\n", netdev->irq);
595 rc = request_irq(netdev->irq, ibmveth_interrupt, 0, netdev->name,
596 netdev);
597 if (rc != 0) {
598 netdev_err(netdev, "unable to request irq 0x%x, rc %d\n",
599 netdev->irq, rc);
600 do {
601 lpar_rc = h_free_logical_lan(adapter->vdev->unit_address);
602 } while (H_IS_LONG_BUSY(lpar_rc) || (lpar_rc == H_BUSY));
603
604 goto out_free_buffer_pools;
605 }
606
607 rc = -ENOMEM;
608 adapter->bounce_buffer =
609 kmalloc(netdev->mtu + IBMVETH_BUFF_OH, GFP_KERNEL);
610 if (!adapter->bounce_buffer)
611 goto out_free_irq;
612
613 adapter->bounce_buffer_dma =
614 dma_map_single(&adapter->vdev->dev, adapter->bounce_buffer,
615 netdev->mtu + IBMVETH_BUFF_OH, DMA_BIDIRECTIONAL);
616 if (dma_mapping_error(dev, adapter->bounce_buffer_dma)) {
617 netdev_err(netdev, "unable to map bounce buffer\n");
618 goto out_free_bounce_buffer;
619 }
620
621 netdev_dbg(netdev, "initial replenish cycle\n");
622 ibmveth_interrupt(netdev->irq, netdev);
623
624 netif_start_queue(netdev);
625
626 netdev_dbg(netdev, "open complete\n");
627
628 return 0;
629
630 out_free_bounce_buffer:
631 kfree(adapter->bounce_buffer);
632 out_free_irq:
633 free_irq(netdev->irq, netdev);
634 out_free_buffer_pools:
635 while (--i >= 0) {
636 if (adapter->rx_buff_pool[i].active)
637 ibmveth_free_buffer_pool(adapter,
638 &adapter->rx_buff_pool[i]);
639 }
640 out_unmap_filter_list:
641 dma_unmap_single(dev, adapter->filter_list_dma, 4096,
642 DMA_BIDIRECTIONAL);
643 out_unmap_buffer_list:
644 dma_unmap_single(dev, adapter->buffer_list_dma, 4096,
645 DMA_BIDIRECTIONAL);
646 out_free_queue_mem:
647 dma_free_coherent(dev, adapter->rx_queue.queue_len,
648 adapter->rx_queue.queue_addr,
649 adapter->rx_queue.queue_dma);
650 out_free_filter_list:
651 free_page((unsigned long)adapter->filter_list_addr);
652 out_free_buffer_list:
653 free_page((unsigned long)adapter->buffer_list_addr);
654 out:
655 napi_disable(&adapter->napi);
656 return rc;
657 }
658
659 static int ibmveth_close(struct net_device *netdev)
660 {
661 struct ibmveth_adapter *adapter = netdev_priv(netdev);
662 struct device *dev = &adapter->vdev->dev;
663 long lpar_rc;
664 int i;
665
666 netdev_dbg(netdev, "close starting\n");
667
668 napi_disable(&adapter->napi);
669
670 if (!adapter->pool_config)
671 netif_stop_queue(netdev);
672
673 h_vio_signal(adapter->vdev->unit_address, VIO_IRQ_DISABLE);
674
675 do {
676 lpar_rc = h_free_logical_lan(adapter->vdev->unit_address);
677 } while (H_IS_LONG_BUSY(lpar_rc) || (lpar_rc == H_BUSY));
678
679 if (lpar_rc != H_SUCCESS) {
680 netdev_err(netdev, "h_free_logical_lan failed with %lx, "
681 "continuing with close\n", lpar_rc);
682 }
683
684 free_irq(netdev->irq, netdev);
685
686 ibmveth_update_rx_no_buffer(adapter);
687
688 dma_unmap_single(dev, adapter->buffer_list_dma, 4096,
689 DMA_BIDIRECTIONAL);
690 free_page((unsigned long)adapter->buffer_list_addr);
691
692 dma_unmap_single(dev, adapter->filter_list_dma, 4096,
693 DMA_BIDIRECTIONAL);
694 free_page((unsigned long)adapter->filter_list_addr);
695
696 dma_free_coherent(dev, adapter->rx_queue.queue_len,
697 adapter->rx_queue.queue_addr,
698 adapter->rx_queue.queue_dma);
699
700 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
701 if (adapter->rx_buff_pool[i].active)
702 ibmveth_free_buffer_pool(adapter,
703 &adapter->rx_buff_pool[i]);
704
705 dma_unmap_single(&adapter->vdev->dev, adapter->bounce_buffer_dma,
706 adapter->netdev->mtu + IBMVETH_BUFF_OH,
707 DMA_BIDIRECTIONAL);
708 kfree(adapter->bounce_buffer);
709
710 netdev_dbg(netdev, "close complete\n");
711
712 return 0;
713 }
714
715 static int ibmveth_set_link_ksettings(struct net_device *dev,
716 const struct ethtool_link_ksettings *cmd)
717 {
718 struct ibmveth_adapter *adapter = netdev_priv(dev);
719
720 return ethtool_virtdev_set_link_ksettings(dev, cmd,
721 &adapter->speed,
722 &adapter->duplex);
723 }
724
725 static int ibmveth_get_link_ksettings(struct net_device *dev,
726 struct ethtool_link_ksettings *cmd)
727 {
728 struct ibmveth_adapter *adapter = netdev_priv(dev);
729
730 cmd->base.speed = adapter->speed;
731 cmd->base.duplex = adapter->duplex;
732 cmd->base.port = PORT_OTHER;
733
734 return 0;
735 }
736
737 static void ibmveth_init_link_settings(struct net_device *dev)
738 {
739 struct ibmveth_adapter *adapter = netdev_priv(dev);
740
741 adapter->speed = SPEED_1000;
742 adapter->duplex = DUPLEX_FULL;
743 }
744
745 static void netdev_get_drvinfo(struct net_device *dev,
746 struct ethtool_drvinfo *info)
747 {
748 strlcpy(info->driver, ibmveth_driver_name, sizeof(info->driver));
749 strlcpy(info->version, ibmveth_driver_version, sizeof(info->version));
750 }
751
752 static netdev_features_t ibmveth_fix_features(struct net_device *dev,
753 netdev_features_t features)
754 {
755 /*
756 * Since the ibmveth firmware interface does not have the
757 * concept of separate tx/rx checksum offload enable, if rx
758 * checksum is disabled we also have to disable tx checksum
759 * offload. Once we disable rx checksum offload, we are no
760 * longer allowed to send tx buffers that are not properly
761 * checksummed.
762 */
763
764 if (!(features & NETIF_F_RXCSUM))
765 features &= ~NETIF_F_CSUM_MASK;
766
767 return features;
768 }
769
770 static int ibmveth_set_csum_offload(struct net_device *dev, u32 data)
771 {
772 struct ibmveth_adapter *adapter = netdev_priv(dev);
773 unsigned long set_attr, clr_attr, ret_attr;
774 unsigned long set_attr6, clr_attr6;
775 long ret, ret4, ret6;
776 int rc1 = 0, rc2 = 0;
777 int restart = 0;
778
779 if (netif_running(dev)) {
780 restart = 1;
781 adapter->pool_config = 1;
782 ibmveth_close(dev);
783 adapter->pool_config = 0;
784 }
785
786 set_attr = 0;
787 clr_attr = 0;
788 set_attr6 = 0;
789 clr_attr6 = 0;
790
791 if (data) {
792 set_attr = IBMVETH_ILLAN_IPV4_TCP_CSUM;
793 set_attr6 = IBMVETH_ILLAN_IPV6_TCP_CSUM;
794 } else {
795 clr_attr = IBMVETH_ILLAN_IPV4_TCP_CSUM;
796 clr_attr6 = IBMVETH_ILLAN_IPV6_TCP_CSUM;
797 }
798
799 ret = h_illan_attributes(adapter->vdev->unit_address, 0, 0, &ret_attr);
800
801 if (ret == H_SUCCESS &&
802 (ret_attr & IBMVETH_ILLAN_PADDED_PKT_CSUM)) {
803 ret4 = h_illan_attributes(adapter->vdev->unit_address, clr_attr,
804 set_attr, &ret_attr);
805
806 if (ret4 != H_SUCCESS) {
807 netdev_err(dev, "unable to change IPv4 checksum "
808 "offload settings. %d rc=%ld\n",
809 data, ret4);
810
811 h_illan_attributes(adapter->vdev->unit_address,
812 set_attr, clr_attr, &ret_attr);
813
814 if (data == 1)
815 dev->features &= ~NETIF_F_IP_CSUM;
816
817 } else {
818 adapter->fw_ipv4_csum_support = data;
819 }
820
821 ret6 = h_illan_attributes(adapter->vdev->unit_address,
822 clr_attr6, set_attr6, &ret_attr);
823
824 if (ret6 != H_SUCCESS) {
825 netdev_err(dev, "unable to change IPv6 checksum "
826 "offload settings. %d rc=%ld\n",
827 data, ret6);
828
829 h_illan_attributes(adapter->vdev->unit_address,
830 set_attr6, clr_attr6, &ret_attr);
831
832 if (data == 1)
833 dev->features &= ~NETIF_F_IPV6_CSUM;
834
835 } else
836 adapter->fw_ipv6_csum_support = data;
837
838 if (ret4 == H_SUCCESS || ret6 == H_SUCCESS)
839 adapter->rx_csum = data;
840 else
841 rc1 = -EIO;
842 } else {
843 rc1 = -EIO;
844 netdev_err(dev, "unable to change checksum offload settings."
845 " %d rc=%ld ret_attr=%lx\n", data, ret,
846 ret_attr);
847 }
848
849 if (restart)
850 rc2 = ibmveth_open(dev);
851
852 return rc1 ? rc1 : rc2;
853 }
854
855 static int ibmveth_set_tso(struct net_device *dev, u32 data)
856 {
857 struct ibmveth_adapter *adapter = netdev_priv(dev);
858 unsigned long set_attr, clr_attr, ret_attr;
859 long ret1, ret2;
860 int rc1 = 0, rc2 = 0;
861 int restart = 0;
862
863 if (netif_running(dev)) {
864 restart = 1;
865 adapter->pool_config = 1;
866 ibmveth_close(dev);
867 adapter->pool_config = 0;
868 }
869
870 set_attr = 0;
871 clr_attr = 0;
872
873 if (data)
874 set_attr = IBMVETH_ILLAN_LRG_SR_ENABLED;
875 else
876 clr_attr = IBMVETH_ILLAN_LRG_SR_ENABLED;
877
878 ret1 = h_illan_attributes(adapter->vdev->unit_address, 0, 0, &ret_attr);
879
880 if (ret1 == H_SUCCESS && (ret_attr & IBMVETH_ILLAN_LRG_SND_SUPPORT) &&
881 !old_large_send) {
882 ret2 = h_illan_attributes(adapter->vdev->unit_address, clr_attr,
883 set_attr, &ret_attr);
884
885 if (ret2 != H_SUCCESS) {
886 netdev_err(dev, "unable to change tso settings. %d rc=%ld\n",
887 data, ret2);
888
889 h_illan_attributes(adapter->vdev->unit_address,
890 set_attr, clr_attr, &ret_attr);
891
892 if (data == 1)
893 dev->features &= ~(NETIF_F_TSO | NETIF_F_TSO6);
894 rc1 = -EIO;
895
896 } else {
897 adapter->fw_large_send_support = data;
898 adapter->large_send = data;
899 }
900 } else {
901 /* Older firmware version of large send offload does not
902 * support tcp6/ipv6
903 */
904 if (data == 1) {
905 dev->features &= ~NETIF_F_TSO6;
906 netdev_info(dev, "TSO feature requires all partitions to have updated driver");
907 }
908 adapter->large_send = data;
909 }
910
911 if (restart)
912 rc2 = ibmveth_open(dev);
913
914 return rc1 ? rc1 : rc2;
915 }
916
917 static int ibmveth_set_features(struct net_device *dev,
918 netdev_features_t features)
919 {
920 struct ibmveth_adapter *adapter = netdev_priv(dev);
921 int rx_csum = !!(features & NETIF_F_RXCSUM);
922 int large_send = !!(features & (NETIF_F_TSO | NETIF_F_TSO6));
923 int rc1 = 0, rc2 = 0;
924
925 if (rx_csum != adapter->rx_csum) {
926 rc1 = ibmveth_set_csum_offload(dev, rx_csum);
927 if (rc1 && !adapter->rx_csum)
928 dev->features =
929 features & ~(NETIF_F_CSUM_MASK |
930 NETIF_F_RXCSUM);
931 }
932
933 if (large_send != adapter->large_send) {
934 rc2 = ibmveth_set_tso(dev, large_send);
935 if (rc2 && !adapter->large_send)
936 dev->features =
937 features & ~(NETIF_F_TSO | NETIF_F_TSO6);
938 }
939
940 return rc1 ? rc1 : rc2;
941 }
942
943 static void ibmveth_get_strings(struct net_device *dev, u32 stringset, u8 *data)
944 {
945 int i;
946
947 if (stringset != ETH_SS_STATS)
948 return;
949
950 for (i = 0; i < ARRAY_SIZE(ibmveth_stats); i++, data += ETH_GSTRING_LEN)
951 memcpy(data, ibmveth_stats[i].name, ETH_GSTRING_LEN);
952 }
953
954 static int ibmveth_get_sset_count(struct net_device *dev, int sset)
955 {
956 switch (sset) {
957 case ETH_SS_STATS:
958 return ARRAY_SIZE(ibmveth_stats);
959 default:
960 return -EOPNOTSUPP;
961 }
962 }
963
964 static void ibmveth_get_ethtool_stats(struct net_device *dev,
965 struct ethtool_stats *stats, u64 *data)
966 {
967 int i;
968 struct ibmveth_adapter *adapter = netdev_priv(dev);
969
970 for (i = 0; i < ARRAY_SIZE(ibmveth_stats); i++)
971 data[i] = IBMVETH_GET_STAT(adapter, ibmveth_stats[i].offset);
972 }
973
974 static const struct ethtool_ops netdev_ethtool_ops = {
975 .get_drvinfo = netdev_get_drvinfo,
976 .get_link = ethtool_op_get_link,
977 .get_strings = ibmveth_get_strings,
978 .get_sset_count = ibmveth_get_sset_count,
979 .get_ethtool_stats = ibmveth_get_ethtool_stats,
980 .get_link_ksettings = ibmveth_get_link_ksettings,
981 .set_link_ksettings = ibmveth_set_link_ksettings,
982 };
983
984 static int ibmveth_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
985 {
986 return -EOPNOTSUPP;
987 }
988
989 static int ibmveth_send(struct ibmveth_adapter *adapter,
990 union ibmveth_buf_desc *descs, unsigned long mss)
991 {
992 unsigned long correlator;
993 unsigned int retry_count;
994 unsigned long ret;
995
996 /*
997 * The retry count sets a maximum for the number of broadcast and
998 * multicast destinations within the system.
999 */
1000 retry_count = 1024;
1001 correlator = 0;
1002 do {
1003 ret = h_send_logical_lan(adapter->vdev->unit_address,
1004 descs[0].desc, descs[1].desc,
1005 descs[2].desc, descs[3].desc,
1006 descs[4].desc, descs[5].desc,
1007 correlator, &correlator, mss,
1008 adapter->fw_large_send_support);
1009 } while ((ret == H_BUSY) && (retry_count--));
1010
1011 if (ret != H_SUCCESS && ret != H_DROPPED) {
1012 netdev_err(adapter->netdev, "tx: h_send_logical_lan failed "
1013 "with rc=%ld\n", ret);
1014 return 1;
1015 }
1016
1017 return 0;
1018 }
1019
1020 static int ibmveth_is_packet_unsupported(struct sk_buff *skb,
1021 struct net_device *netdev)
1022 {
1023 struct ethhdr *ether_header;
1024 int ret = 0;
1025
1026 ether_header = eth_hdr(skb);
1027
1028 if (ether_addr_equal(ether_header->h_dest, netdev->dev_addr)) {
1029 netdev_dbg(netdev, "veth doesn't support loopback packets, dropping packet.\n");
1030 netdev->stats.tx_dropped++;
1031 ret = -EOPNOTSUPP;
1032 }
1033
1034 return ret;
1035 }
1036
1037 static netdev_tx_t ibmveth_start_xmit(struct sk_buff *skb,
1038 struct net_device *netdev)
1039 {
1040 struct ibmveth_adapter *adapter = netdev_priv(netdev);
1041 unsigned int desc_flags;
1042 union ibmveth_buf_desc descs[6];
1043 int last, i;
1044 int force_bounce = 0;
1045 dma_addr_t dma_addr;
1046 unsigned long mss = 0;
1047
1048 if (ibmveth_is_packet_unsupported(skb, netdev))
1049 goto out;
1050
1051 /* veth doesn't handle frag_list, so linearize the skb.
1052 * When GRO is enabled SKB's can have frag_list.
1053 */
1054 if (adapter->is_active_trunk &&
1055 skb_has_frag_list(skb) && __skb_linearize(skb)) {
1056 netdev->stats.tx_dropped++;
1057 goto out;
1058 }
1059
1060 /*
1061 * veth handles a maximum of 6 segments including the header, so
1062 * we have to linearize the skb if there are more than this.
1063 */
1064 if (skb_shinfo(skb)->nr_frags > 5 && __skb_linearize(skb)) {
1065 netdev->stats.tx_dropped++;
1066 goto out;
1067 }
1068
1069 /* veth can't checksum offload UDP */
1070 if (skb->ip_summed == CHECKSUM_PARTIAL &&
1071 ((skb->protocol == htons(ETH_P_IP) &&
1072 ip_hdr(skb)->protocol != IPPROTO_TCP) ||
1073 (skb->protocol == htons(ETH_P_IPV6) &&
1074 ipv6_hdr(skb)->nexthdr != IPPROTO_TCP)) &&
1075 skb_checksum_help(skb)) {
1076
1077 netdev_err(netdev, "tx: failed to checksum packet\n");
1078 netdev->stats.tx_dropped++;
1079 goto out;
1080 }
1081
1082 desc_flags = IBMVETH_BUF_VALID;
1083
1084 if (skb->ip_summed == CHECKSUM_PARTIAL) {
1085 unsigned char *buf = skb_transport_header(skb) +
1086 skb->csum_offset;
1087
1088 desc_flags |= (IBMVETH_BUF_NO_CSUM | IBMVETH_BUF_CSUM_GOOD);
1089
1090 /* Need to zero out the checksum */
1091 buf[0] = 0;
1092 buf[1] = 0;
1093
1094 if (skb_is_gso(skb) && adapter->fw_large_send_support)
1095 desc_flags |= IBMVETH_BUF_LRG_SND;
1096 }
1097
1098 retry_bounce:
1099 memset(descs, 0, sizeof(descs));
1100
1101 /*
1102 * If a linear packet is below the rx threshold then
1103 * copy it into the static bounce buffer. This avoids the
1104 * cost of a TCE insert and remove.
1105 */
1106 if (force_bounce || (!skb_is_nonlinear(skb) &&
1107 (skb->len < tx_copybreak))) {
1108 skb_copy_from_linear_data(skb, adapter->bounce_buffer,
1109 skb->len);
1110
1111 descs[0].fields.flags_len = desc_flags | skb->len;
1112 descs[0].fields.address = adapter->bounce_buffer_dma;
1113
1114 if (ibmveth_send(adapter, descs, 0)) {
1115 adapter->tx_send_failed++;
1116 netdev->stats.tx_dropped++;
1117 } else {
1118 netdev->stats.tx_packets++;
1119 netdev->stats.tx_bytes += skb->len;
1120 }
1121
1122 goto out;
1123 }
1124
1125 /* Map the header */
1126 dma_addr = dma_map_single(&adapter->vdev->dev, skb->data,
1127 skb_headlen(skb), DMA_TO_DEVICE);
1128 if (dma_mapping_error(&adapter->vdev->dev, dma_addr))
1129 goto map_failed;
1130
1131 descs[0].fields.flags_len = desc_flags | skb_headlen(skb);
1132 descs[0].fields.address = dma_addr;
1133
1134 /* Map the frags */
1135 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1136 const skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1137
1138 dma_addr = skb_frag_dma_map(&adapter->vdev->dev, frag, 0,
1139 skb_frag_size(frag), DMA_TO_DEVICE);
1140
1141 if (dma_mapping_error(&adapter->vdev->dev, dma_addr))
1142 goto map_failed_frags;
1143
1144 descs[i+1].fields.flags_len = desc_flags | skb_frag_size(frag);
1145 descs[i+1].fields.address = dma_addr;
1146 }
1147
1148 if (skb->ip_summed == CHECKSUM_PARTIAL && skb_is_gso(skb)) {
1149 if (adapter->fw_large_send_support) {
1150 mss = (unsigned long)skb_shinfo(skb)->gso_size;
1151 adapter->tx_large_packets++;
1152 } else if (!skb_is_gso_v6(skb)) {
1153 /* Put -1 in the IP checksum to tell phyp it
1154 * is a largesend packet. Put the mss in
1155 * the TCP checksum.
1156 */
1157 ip_hdr(skb)->check = 0xffff;
1158 tcp_hdr(skb)->check =
1159 cpu_to_be16(skb_shinfo(skb)->gso_size);
1160 adapter->tx_large_packets++;
1161 }
1162 }
1163
1164 if (ibmveth_send(adapter, descs, mss)) {
1165 adapter->tx_send_failed++;
1166 netdev->stats.tx_dropped++;
1167 } else {
1168 netdev->stats.tx_packets++;
1169 netdev->stats.tx_bytes += skb->len;
1170 }
1171
1172 dma_unmap_single(&adapter->vdev->dev,
1173 descs[0].fields.address,
1174 descs[0].fields.flags_len & IBMVETH_BUF_LEN_MASK,
1175 DMA_TO_DEVICE);
1176
1177 for (i = 1; i < skb_shinfo(skb)->nr_frags + 1; i++)
1178 dma_unmap_page(&adapter->vdev->dev, descs[i].fields.address,
1179 descs[i].fields.flags_len & IBMVETH_BUF_LEN_MASK,
1180 DMA_TO_DEVICE);
1181
1182 out:
1183 dev_consume_skb_any(skb);
1184 return NETDEV_TX_OK;
1185
1186 map_failed_frags:
1187 last = i+1;
1188 for (i = 1; i < last; i++)
1189 dma_unmap_page(&adapter->vdev->dev, descs[i].fields.address,
1190 descs[i].fields.flags_len & IBMVETH_BUF_LEN_MASK,
1191 DMA_TO_DEVICE);
1192
1193 dma_unmap_single(&adapter->vdev->dev,
1194 descs[0].fields.address,
1195 descs[0].fields.flags_len & IBMVETH_BUF_LEN_MASK,
1196 DMA_TO_DEVICE);
1197 map_failed:
1198 if (!firmware_has_feature(FW_FEATURE_CMO))
1199 netdev_err(netdev, "tx: unable to map xmit buffer\n");
1200 adapter->tx_map_failed++;
1201 if (skb_linearize(skb)) {
1202 netdev->stats.tx_dropped++;
1203 goto out;
1204 }
1205 force_bounce = 1;
1206 goto retry_bounce;
1207 }
1208
1209 static void ibmveth_rx_mss_helper(struct sk_buff *skb, u16 mss, int lrg_pkt)
1210 {
1211 struct tcphdr *tcph;
1212 int offset = 0;
1213 int hdr_len;
1214
1215 /* only TCP packets will be aggregated */
1216 if (skb->protocol == htons(ETH_P_IP)) {
1217 struct iphdr *iph = (struct iphdr *)skb->data;
1218
1219 if (iph->protocol == IPPROTO_TCP) {
1220 offset = iph->ihl * 4;
1221 skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4;
1222 } else {
1223 return;
1224 }
1225 } else if (skb->protocol == htons(ETH_P_IPV6)) {
1226 struct ipv6hdr *iph6 = (struct ipv6hdr *)skb->data;
1227
1228 if (iph6->nexthdr == IPPROTO_TCP) {
1229 offset = sizeof(struct ipv6hdr);
1230 skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6;
1231 } else {
1232 return;
1233 }
1234 } else {
1235 return;
1236 }
1237 /* if mss is not set through Large Packet bit/mss in rx buffer,
1238 * expect that the mss will be written to the tcp header checksum.
1239 */
1240 tcph = (struct tcphdr *)(skb->data + offset);
1241 if (lrg_pkt) {
1242 skb_shinfo(skb)->gso_size = mss;
1243 } else if (offset) {
1244 skb_shinfo(skb)->gso_size = ntohs(tcph->check);
1245 tcph->check = 0;
1246 }
1247
1248 if (skb_shinfo(skb)->gso_size) {
1249 hdr_len = offset + tcph->doff * 4;
1250 skb_shinfo(skb)->gso_segs =
1251 DIV_ROUND_UP(skb->len - hdr_len,
1252 skb_shinfo(skb)->gso_size);
1253 }
1254 }
1255
1256 static void ibmveth_rx_csum_helper(struct sk_buff *skb,
1257 struct ibmveth_adapter *adapter)
1258 {
1259 struct iphdr *iph = NULL;
1260 struct ipv6hdr *iph6 = NULL;
1261 __be16 skb_proto = 0;
1262 u16 iphlen = 0;
1263 u16 iph_proto = 0;
1264 u16 tcphdrlen = 0;
1265
1266 skb_proto = be16_to_cpu(skb->protocol);
1267
1268 if (skb_proto == ETH_P_IP) {
1269 iph = (struct iphdr *)skb->data;
1270
1271 /* If the IP checksum is not offloaded and if the packet
1272 * is large send, the checksum must be rebuilt.
1273 */
1274 if (iph->check == 0xffff) {
1275 iph->check = 0;
1276 iph->check = ip_fast_csum((unsigned char *)iph,
1277 iph->ihl);
1278 }
1279
1280 iphlen = iph->ihl * 4;
1281 iph_proto = iph->protocol;
1282 } else if (skb_proto == ETH_P_IPV6) {
1283 iph6 = (struct ipv6hdr *)skb->data;
1284 iphlen = sizeof(struct ipv6hdr);
1285 iph_proto = iph6->nexthdr;
1286 }
1287
1288 /* In OVS environment, when a flow is not cached, specifically for a
1289 * new TCP connection, the first packet information is passed up
1290 * the user space for finding a flow. During this process, OVS computes
1291 * checksum on the first packet when CHECKSUM_PARTIAL flag is set.
1292 *
1293 * Given that we zeroed out TCP checksum field in transmit path
1294 * (refer ibmveth_start_xmit routine) as we set "no checksum bit",
1295 * OVS computed checksum will be incorrect w/o TCP pseudo checksum
1296 * in the packet. This leads to OVS dropping the packet and hence
1297 * TCP retransmissions are seen.
1298 *
1299 * So, re-compute TCP pseudo header checksum.
1300 */
1301 if (iph_proto == IPPROTO_TCP && adapter->is_active_trunk) {
1302 struct tcphdr *tcph = (struct tcphdr *)(skb->data + iphlen);
1303
1304 tcphdrlen = skb->len - iphlen;
1305
1306 /* Recompute TCP pseudo header checksum */
1307 if (skb_proto == ETH_P_IP)
1308 tcph->check = ~csum_tcpudp_magic(iph->saddr,
1309 iph->daddr, tcphdrlen, iph_proto, 0);
1310 else if (skb_proto == ETH_P_IPV6)
1311 tcph->check = ~csum_ipv6_magic(&iph6->saddr,
1312 &iph6->daddr, tcphdrlen, iph_proto, 0);
1313
1314 /* Setup SKB fields for checksum offload */
1315 skb_partial_csum_set(skb, iphlen,
1316 offsetof(struct tcphdr, check));
1317 skb_reset_network_header(skb);
1318 }
1319 }
1320
1321 static int ibmveth_poll(struct napi_struct *napi, int budget)
1322 {
1323 struct ibmveth_adapter *adapter =
1324 container_of(napi, struct ibmveth_adapter, napi);
1325 struct net_device *netdev = adapter->netdev;
1326 int frames_processed = 0;
1327 unsigned long lpar_rc;
1328 u16 mss = 0;
1329
1330 while (frames_processed < budget) {
1331 if (!ibmveth_rxq_pending_buffer(adapter))
1332 break;
1333
1334 smp_rmb();
1335 if (!ibmveth_rxq_buffer_valid(adapter)) {
1336 wmb(); /* suggested by larson1 */
1337 adapter->rx_invalid_buffer++;
1338 netdev_dbg(netdev, "recycling invalid buffer\n");
1339 ibmveth_rxq_recycle_buffer(adapter);
1340 } else {
1341 struct sk_buff *skb, *new_skb;
1342 int length = ibmveth_rxq_frame_length(adapter);
1343 int offset = ibmveth_rxq_frame_offset(adapter);
1344 int csum_good = ibmveth_rxq_csum_good(adapter);
1345 int lrg_pkt = ibmveth_rxq_large_packet(adapter);
1346 __sum16 iph_check = 0;
1347
1348 skb = ibmveth_rxq_get_buffer(adapter);
1349
1350 /* if the large packet bit is set in the rx queue
1351 * descriptor, the mss will be written by PHYP eight
1352 * bytes from the start of the rx buffer, which is
1353 * skb->data at this stage
1354 */
1355 if (lrg_pkt) {
1356 __be64 *rxmss = (__be64 *)(skb->data + 8);
1357
1358 mss = (u16)be64_to_cpu(*rxmss);
1359 }
1360
1361 new_skb = NULL;
1362 if (length < rx_copybreak)
1363 new_skb = netdev_alloc_skb(netdev, length);
1364
1365 if (new_skb) {
1366 skb_copy_to_linear_data(new_skb,
1367 skb->data + offset,
1368 length);
1369 if (rx_flush)
1370 ibmveth_flush_buffer(skb->data,
1371 length + offset);
1372 if (!ibmveth_rxq_recycle_buffer(adapter))
1373 kfree_skb(skb);
1374 skb = new_skb;
1375 } else {
1376 ibmveth_rxq_harvest_buffer(adapter);
1377 skb_reserve(skb, offset);
1378 }
1379
1380 skb_put(skb, length);
1381 skb->protocol = eth_type_trans(skb, netdev);
1382
1383 /* PHYP without PLSO support places a -1 in the ip
1384 * checksum for large send frames.
1385 */
1386 if (skb->protocol == cpu_to_be16(ETH_P_IP)) {
1387 struct iphdr *iph = (struct iphdr *)skb->data;
1388
1389 iph_check = iph->check;
1390 }
1391
1392 if ((length > netdev->mtu + ETH_HLEN) ||
1393 lrg_pkt || iph_check == 0xffff) {
1394 ibmveth_rx_mss_helper(skb, mss, lrg_pkt);
1395 adapter->rx_large_packets++;
1396 }
1397
1398 if (csum_good) {
1399 skb->ip_summed = CHECKSUM_UNNECESSARY;
1400 ibmveth_rx_csum_helper(skb, adapter);
1401 }
1402
1403 napi_gro_receive(napi, skb); /* send it up */
1404
1405 netdev->stats.rx_packets++;
1406 netdev->stats.rx_bytes += length;
1407 frames_processed++;
1408 }
1409 }
1410
1411 ibmveth_replenish_task(adapter);
1412
1413 if (frames_processed < budget) {
1414 napi_complete_done(napi, frames_processed);
1415
1416 /* We think we are done - reenable interrupts,
1417 * then check once more to make sure we are done.
1418 */
1419 lpar_rc = h_vio_signal(adapter->vdev->unit_address,
1420 VIO_IRQ_ENABLE);
1421
1422 BUG_ON(lpar_rc != H_SUCCESS);
1423
1424 if (ibmveth_rxq_pending_buffer(adapter) &&
1425 napi_reschedule(napi)) {
1426 lpar_rc = h_vio_signal(adapter->vdev->unit_address,
1427 VIO_IRQ_DISABLE);
1428 }
1429 }
1430
1431 return frames_processed;
1432 }
1433
1434 static irqreturn_t ibmveth_interrupt(int irq, void *dev_instance)
1435 {
1436 struct net_device *netdev = dev_instance;
1437 struct ibmveth_adapter *adapter = netdev_priv(netdev);
1438 unsigned long lpar_rc;
1439
1440 if (napi_schedule_prep(&adapter->napi)) {
1441 lpar_rc = h_vio_signal(adapter->vdev->unit_address,
1442 VIO_IRQ_DISABLE);
1443 BUG_ON(lpar_rc != H_SUCCESS);
1444 __napi_schedule(&adapter->napi);
1445 }
1446 return IRQ_HANDLED;
1447 }
1448
1449 static void ibmveth_set_multicast_list(struct net_device *netdev)
1450 {
1451 struct ibmveth_adapter *adapter = netdev_priv(netdev);
1452 unsigned long lpar_rc;
1453
1454 if ((netdev->flags & IFF_PROMISC) ||
1455 (netdev_mc_count(netdev) > adapter->mcastFilterSize)) {
1456 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1457 IbmVethMcastEnableRecv |
1458 IbmVethMcastDisableFiltering,
1459 0);
1460 if (lpar_rc != H_SUCCESS) {
1461 netdev_err(netdev, "h_multicast_ctrl rc=%ld when "
1462 "entering promisc mode\n", lpar_rc);
1463 }
1464 } else {
1465 struct netdev_hw_addr *ha;
1466 /* clear the filter table & disable filtering */
1467 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1468 IbmVethMcastEnableRecv |
1469 IbmVethMcastDisableFiltering |
1470 IbmVethMcastClearFilterTable,
1471 0);
1472 if (lpar_rc != H_SUCCESS) {
1473 netdev_err(netdev, "h_multicast_ctrl rc=%ld when "
1474 "attempting to clear filter table\n",
1475 lpar_rc);
1476 }
1477 /* add the addresses to the filter table */
1478 netdev_for_each_mc_addr(ha, netdev) {
1479 /* add the multicast address to the filter table */
1480 u64 mcast_addr;
1481 mcast_addr = ibmveth_encode_mac_addr(ha->addr);
1482 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1483 IbmVethMcastAddFilter,
1484 mcast_addr);
1485 if (lpar_rc != H_SUCCESS) {
1486 netdev_err(netdev, "h_multicast_ctrl rc=%ld "
1487 "when adding an entry to the filter "
1488 "table\n", lpar_rc);
1489 }
1490 }
1491
1492 /* re-enable filtering */
1493 lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
1494 IbmVethMcastEnableFiltering,
1495 0);
1496 if (lpar_rc != H_SUCCESS) {
1497 netdev_err(netdev, "h_multicast_ctrl rc=%ld when "
1498 "enabling filtering\n", lpar_rc);
1499 }
1500 }
1501 }
1502
1503 static int ibmveth_change_mtu(struct net_device *dev, int new_mtu)
1504 {
1505 struct ibmveth_adapter *adapter = netdev_priv(dev);
1506 struct vio_dev *viodev = adapter->vdev;
1507 int new_mtu_oh = new_mtu + IBMVETH_BUFF_OH;
1508 int i, rc;
1509 int need_restart = 0;
1510
1511 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
1512 if (new_mtu_oh <= adapter->rx_buff_pool[i].buff_size)
1513 break;
1514
1515 if (i == IBMVETH_NUM_BUFF_POOLS)
1516 return -EINVAL;
1517
1518 /* Deactivate all the buffer pools so that the next loop can activate
1519 only the buffer pools necessary to hold the new MTU */
1520 if (netif_running(adapter->netdev)) {
1521 need_restart = 1;
1522 adapter->pool_config = 1;
1523 ibmveth_close(adapter->netdev);
1524 adapter->pool_config = 0;
1525 }
1526
1527 /* Look for an active buffer pool that can hold the new MTU */
1528 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1529 adapter->rx_buff_pool[i].active = 1;
1530
1531 if (new_mtu_oh <= adapter->rx_buff_pool[i].buff_size) {
1532 dev->mtu = new_mtu;
1533 vio_cmo_set_dev_desired(viodev,
1534 ibmveth_get_desired_dma
1535 (viodev));
1536 if (need_restart) {
1537 return ibmveth_open(adapter->netdev);
1538 }
1539 return 0;
1540 }
1541 }
1542
1543 if (need_restart && (rc = ibmveth_open(adapter->netdev)))
1544 return rc;
1545
1546 return -EINVAL;
1547 }
1548
1549 #ifdef CONFIG_NET_POLL_CONTROLLER
1550 static void ibmveth_poll_controller(struct net_device *dev)
1551 {
1552 ibmveth_replenish_task(netdev_priv(dev));
1553 ibmveth_interrupt(dev->irq, dev);
1554 }
1555 #endif
1556
1557 /**
1558 * ibmveth_get_desired_dma - Calculate IO memory desired by the driver
1559 *
1560 * @vdev: struct vio_dev for the device whose desired IO mem is to be returned
1561 *
1562 * Return value:
1563 * Number of bytes of IO data the driver will need to perform well.
1564 */
1565 static unsigned long ibmveth_get_desired_dma(struct vio_dev *vdev)
1566 {
1567 struct net_device *netdev = dev_get_drvdata(&vdev->dev);
1568 struct ibmveth_adapter *adapter;
1569 struct iommu_table *tbl;
1570 unsigned long ret;
1571 int i;
1572 int rxqentries = 1;
1573
1574 tbl = get_iommu_table_base(&vdev->dev);
1575
1576 /* netdev inits at probe time along with the structures we need below*/
1577 if (netdev == NULL)
1578 return IOMMU_PAGE_ALIGN(IBMVETH_IO_ENTITLEMENT_DEFAULT, tbl);
1579
1580 adapter = netdev_priv(netdev);
1581
1582 ret = IBMVETH_BUFF_LIST_SIZE + IBMVETH_FILT_LIST_SIZE;
1583 ret += IOMMU_PAGE_ALIGN(netdev->mtu, tbl);
1584
1585 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1586 /* add the size of the active receive buffers */
1587 if (adapter->rx_buff_pool[i].active)
1588 ret +=
1589 adapter->rx_buff_pool[i].size *
1590 IOMMU_PAGE_ALIGN(adapter->rx_buff_pool[i].
1591 buff_size, tbl);
1592 rxqentries += adapter->rx_buff_pool[i].size;
1593 }
1594 /* add the size of the receive queue entries */
1595 ret += IOMMU_PAGE_ALIGN(
1596 rxqentries * sizeof(struct ibmveth_rx_q_entry), tbl);
1597
1598 return ret;
1599 }
1600
1601 static int ibmveth_set_mac_addr(struct net_device *dev, void *p)
1602 {
1603 struct ibmveth_adapter *adapter = netdev_priv(dev);
1604 struct sockaddr *addr = p;
1605 u64 mac_address;
1606 int rc;
1607
1608 if (!is_valid_ether_addr(addr->sa_data))
1609 return -EADDRNOTAVAIL;
1610
1611 mac_address = ibmveth_encode_mac_addr(addr->sa_data);
1612 rc = h_change_logical_lan_mac(adapter->vdev->unit_address, mac_address);
1613 if (rc) {
1614 netdev_err(adapter->netdev, "h_change_logical_lan_mac failed with rc=%d\n", rc);
1615 return rc;
1616 }
1617
1618 ether_addr_copy(dev->dev_addr, addr->sa_data);
1619
1620 return 0;
1621 }
1622
1623 static const struct net_device_ops ibmveth_netdev_ops = {
1624 .ndo_open = ibmveth_open,
1625 .ndo_stop = ibmveth_close,
1626 .ndo_start_xmit = ibmveth_start_xmit,
1627 .ndo_set_rx_mode = ibmveth_set_multicast_list,
1628 .ndo_do_ioctl = ibmveth_ioctl,
1629 .ndo_change_mtu = ibmveth_change_mtu,
1630 .ndo_fix_features = ibmveth_fix_features,
1631 .ndo_set_features = ibmveth_set_features,
1632 .ndo_validate_addr = eth_validate_addr,
1633 .ndo_set_mac_address = ibmveth_set_mac_addr,
1634 #ifdef CONFIG_NET_POLL_CONTROLLER
1635 .ndo_poll_controller = ibmveth_poll_controller,
1636 #endif
1637 };
1638
1639 static int ibmveth_probe(struct vio_dev *dev, const struct vio_device_id *id)
1640 {
1641 int rc, i, mac_len;
1642 struct net_device *netdev;
1643 struct ibmveth_adapter *adapter;
1644 unsigned char *mac_addr_p;
1645 __be32 *mcastFilterSize_p;
1646 long ret;
1647 unsigned long ret_attr;
1648
1649 dev_dbg(&dev->dev, "entering ibmveth_probe for UA 0x%x\n",
1650 dev->unit_address);
1651
1652 mac_addr_p = (unsigned char *)vio_get_attribute(dev, VETH_MAC_ADDR,
1653 &mac_len);
1654 if (!mac_addr_p) {
1655 dev_err(&dev->dev, "Can't find VETH_MAC_ADDR attribute\n");
1656 return -EINVAL;
1657 }
1658 /* Workaround for old/broken pHyp */
1659 if (mac_len == 8)
1660 mac_addr_p += 2;
1661 else if (mac_len != 6) {
1662 dev_err(&dev->dev, "VETH_MAC_ADDR attribute wrong len %d\n",
1663 mac_len);
1664 return -EINVAL;
1665 }
1666
1667 mcastFilterSize_p = (__be32 *)vio_get_attribute(dev,
1668 VETH_MCAST_FILTER_SIZE,
1669 NULL);
1670 if (!mcastFilterSize_p) {
1671 dev_err(&dev->dev, "Can't find VETH_MCAST_FILTER_SIZE "
1672 "attribute\n");
1673 return -EINVAL;
1674 }
1675
1676 netdev = alloc_etherdev(sizeof(struct ibmveth_adapter));
1677
1678 if (!netdev)
1679 return -ENOMEM;
1680
1681 adapter = netdev_priv(netdev);
1682 dev_set_drvdata(&dev->dev, netdev);
1683
1684 adapter->vdev = dev;
1685 adapter->netdev = netdev;
1686 adapter->mcastFilterSize = be32_to_cpu(*mcastFilterSize_p);
1687 adapter->pool_config = 0;
1688 ibmveth_init_link_settings(netdev);
1689
1690 netif_napi_add(netdev, &adapter->napi, ibmveth_poll, 16);
1691
1692 netdev->irq = dev->irq;
1693 netdev->netdev_ops = &ibmveth_netdev_ops;
1694 netdev->ethtool_ops = &netdev_ethtool_ops;
1695 SET_NETDEV_DEV(netdev, &dev->dev);
1696 netdev->hw_features = NETIF_F_SG;
1697 if (vio_get_attribute(dev, "ibm,illan-options", NULL) != NULL) {
1698 netdev->hw_features |= NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
1699 NETIF_F_RXCSUM;
1700 }
1701
1702 netdev->features |= netdev->hw_features;
1703
1704 ret = h_illan_attributes(adapter->vdev->unit_address, 0, 0, &ret_attr);
1705
1706 /* If running older firmware, TSO should not be enabled by default */
1707 if (ret == H_SUCCESS && (ret_attr & IBMVETH_ILLAN_LRG_SND_SUPPORT) &&
1708 !old_large_send) {
1709 netdev->hw_features |= NETIF_F_TSO | NETIF_F_TSO6;
1710 netdev->features |= netdev->hw_features;
1711 } else {
1712 netdev->hw_features |= NETIF_F_TSO;
1713 }
1714
1715 adapter->is_active_trunk = false;
1716 if (ret == H_SUCCESS && (ret_attr & IBMVETH_ILLAN_ACTIVE_TRUNK)) {
1717 adapter->is_active_trunk = true;
1718 netdev->hw_features |= NETIF_F_FRAGLIST;
1719 netdev->features |= NETIF_F_FRAGLIST;
1720 }
1721
1722 netdev->min_mtu = IBMVETH_MIN_MTU;
1723 netdev->max_mtu = ETH_MAX_MTU - IBMVETH_BUFF_OH;
1724
1725 memcpy(netdev->dev_addr, mac_addr_p, ETH_ALEN);
1726
1727 if (firmware_has_feature(FW_FEATURE_CMO))
1728 memcpy(pool_count, pool_count_cmo, sizeof(pool_count));
1729
1730 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1731 struct kobject *kobj = &adapter->rx_buff_pool[i].kobj;
1732 int error;
1733
1734 ibmveth_init_buffer_pool(&adapter->rx_buff_pool[i], i,
1735 pool_count[i], pool_size[i],
1736 pool_active[i]);
1737 error = kobject_init_and_add(kobj, &ktype_veth_pool,
1738 &dev->dev.kobj, "pool%d", i);
1739 if (!error)
1740 kobject_uevent(kobj, KOBJ_ADD);
1741 }
1742
1743 netdev_dbg(netdev, "adapter @ 0x%p\n", adapter);
1744 netdev_dbg(netdev, "registering netdev...\n");
1745
1746 ibmveth_set_features(netdev, netdev->features);
1747
1748 rc = register_netdev(netdev);
1749
1750 if (rc) {
1751 netdev_dbg(netdev, "failed to register netdev rc=%d\n", rc);
1752 free_netdev(netdev);
1753 return rc;
1754 }
1755
1756 netdev_dbg(netdev, "registered\n");
1757
1758 return 0;
1759 }
1760
1761 static void ibmveth_remove(struct vio_dev *dev)
1762 {
1763 struct net_device *netdev = dev_get_drvdata(&dev->dev);
1764 struct ibmveth_adapter *adapter = netdev_priv(netdev);
1765 int i;
1766
1767 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++)
1768 kobject_put(&adapter->rx_buff_pool[i].kobj);
1769
1770 unregister_netdev(netdev);
1771
1772 free_netdev(netdev);
1773 dev_set_drvdata(&dev->dev, NULL);
1774 }
1775
1776 static struct attribute veth_active_attr;
1777 static struct attribute veth_num_attr;
1778 static struct attribute veth_size_attr;
1779
1780 static ssize_t veth_pool_show(struct kobject *kobj,
1781 struct attribute *attr, char *buf)
1782 {
1783 struct ibmveth_buff_pool *pool = container_of(kobj,
1784 struct ibmveth_buff_pool,
1785 kobj);
1786
1787 if (attr == &veth_active_attr)
1788 return sprintf(buf, "%d\n", pool->active);
1789 else if (attr == &veth_num_attr)
1790 return sprintf(buf, "%d\n", pool->size);
1791 else if (attr == &veth_size_attr)
1792 return sprintf(buf, "%d\n", pool->buff_size);
1793 return 0;
1794 }
1795
1796 static ssize_t veth_pool_store(struct kobject *kobj, struct attribute *attr,
1797 const char *buf, size_t count)
1798 {
1799 struct ibmveth_buff_pool *pool = container_of(kobj,
1800 struct ibmveth_buff_pool,
1801 kobj);
1802 struct net_device *netdev = dev_get_drvdata(
1803 container_of(kobj->parent, struct device, kobj));
1804 struct ibmveth_adapter *adapter = netdev_priv(netdev);
1805 long value = simple_strtol(buf, NULL, 10);
1806 long rc;
1807
1808 if (attr == &veth_active_attr) {
1809 if (value && !pool->active) {
1810 if (netif_running(netdev)) {
1811 if (ibmveth_alloc_buffer_pool(pool)) {
1812 netdev_err(netdev,
1813 "unable to alloc pool\n");
1814 return -ENOMEM;
1815 }
1816 pool->active = 1;
1817 adapter->pool_config = 1;
1818 ibmveth_close(netdev);
1819 adapter->pool_config = 0;
1820 if ((rc = ibmveth_open(netdev)))
1821 return rc;
1822 } else {
1823 pool->active = 1;
1824 }
1825 } else if (!value && pool->active) {
1826 int mtu = netdev->mtu + IBMVETH_BUFF_OH;
1827 int i;
1828 /* Make sure there is a buffer pool with buffers that
1829 can hold a packet of the size of the MTU */
1830 for (i = 0; i < IBMVETH_NUM_BUFF_POOLS; i++) {
1831 if (pool == &adapter->rx_buff_pool[i])
1832 continue;
1833 if (!adapter->rx_buff_pool[i].active)
1834 continue;
1835 if (mtu <= adapter->rx_buff_pool[i].buff_size)
1836 break;
1837 }
1838
1839 if (i == IBMVETH_NUM_BUFF_POOLS) {
1840 netdev_err(netdev, "no active pool >= MTU\n");
1841 return -EPERM;
1842 }
1843
1844 if (netif_running(netdev)) {
1845 adapter->pool_config = 1;
1846 ibmveth_close(netdev);
1847 pool->active = 0;
1848 adapter->pool_config = 0;
1849 if ((rc = ibmveth_open(netdev)))
1850 return rc;
1851 }
1852 pool->active = 0;
1853 }
1854 } else if (attr == &veth_num_attr) {
1855 if (value <= 0 || value > IBMVETH_MAX_POOL_COUNT) {
1856 return -EINVAL;
1857 } else {
1858 if (netif_running(netdev)) {
1859 adapter->pool_config = 1;
1860 ibmveth_close(netdev);
1861 adapter->pool_config = 0;
1862 pool->size = value;
1863 if ((rc = ibmveth_open(netdev)))
1864 return rc;
1865 } else {
1866 pool->size = value;
1867 }
1868 }
1869 } else if (attr == &veth_size_attr) {
1870 if (value <= IBMVETH_BUFF_OH || value > IBMVETH_MAX_BUF_SIZE) {
1871 return -EINVAL;
1872 } else {
1873 if (netif_running(netdev)) {
1874 adapter->pool_config = 1;
1875 ibmveth_close(netdev);
1876 adapter->pool_config = 0;
1877 pool->buff_size = value;
1878 if ((rc = ibmveth_open(netdev)))
1879 return rc;
1880 } else {
1881 pool->buff_size = value;
1882 }
1883 }
1884 }
1885
1886 /* kick the interrupt handler to allocate/deallocate pools */
1887 ibmveth_interrupt(netdev->irq, netdev);
1888 return count;
1889 }
1890
1891
1892 #define ATTR(_name, _mode) \
1893 struct attribute veth_##_name##_attr = { \
1894 .name = __stringify(_name), .mode = _mode, \
1895 };
1896
1897 static ATTR(active, 0644);
1898 static ATTR(num, 0644);
1899 static ATTR(size, 0644);
1900
1901 static struct attribute *veth_pool_attrs[] = {
1902 &veth_active_attr,
1903 &veth_num_attr,
1904 &veth_size_attr,
1905 NULL,
1906 };
1907
1908 static const struct sysfs_ops veth_pool_ops = {
1909 .show = veth_pool_show,
1910 .store = veth_pool_store,
1911 };
1912
1913 static struct kobj_type ktype_veth_pool = {
1914 .release = NULL,
1915 .sysfs_ops = &veth_pool_ops,
1916 .default_attrs = veth_pool_attrs,
1917 };
1918
1919 static int ibmveth_resume(struct device *dev)
1920 {
1921 struct net_device *netdev = dev_get_drvdata(dev);
1922 ibmveth_interrupt(netdev->irq, netdev);
1923 return 0;
1924 }
1925
1926 static const struct vio_device_id ibmveth_device_table[] = {
1927 { "network", "IBM,l-lan"},
1928 { "", "" }
1929 };
1930 MODULE_DEVICE_TABLE(vio, ibmveth_device_table);
1931
1932 static const struct dev_pm_ops ibmveth_pm_ops = {
1933 .resume = ibmveth_resume
1934 };
1935
1936 static struct vio_driver ibmveth_driver = {
1937 .id_table = ibmveth_device_table,
1938 .probe = ibmveth_probe,
1939 .remove = ibmveth_remove,
1940 .get_desired_dma = ibmveth_get_desired_dma,
1941 .name = ibmveth_driver_name,
1942 .pm = &ibmveth_pm_ops,
1943 };
1944
1945 static int __init ibmveth_module_init(void)
1946 {
1947 printk(KERN_DEBUG "%s: %s %s\n", ibmveth_driver_name,
1948 ibmveth_driver_string, ibmveth_driver_version);
1949
1950 return vio_register_driver(&ibmveth_driver);
1951 }
1952
1953 static void __exit ibmveth_module_exit(void)
1954 {
1955 vio_unregister_driver(&ibmveth_driver);
1956 }
1957
1958 module_init(ibmveth_module_init);
1959 module_exit(ibmveth_module_exit);
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