1 /*
2 * Copyright (c) 2004, 2005 Topspin Communications. All rights reserved.
3 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
4 * Copyright (c) 2005 Mellanox Technologies. All rights reserved.
5 * Copyright (c) 2004, 2005 Voltaire, Inc. All rights reserved.
6 *
7 * This software is available to you under a choice of one of two
8 * licenses. You may choose to be licensed under the terms of the GNU
9 * General Public License (GPL) Version 2, available from the file
10 * COPYING in the main directory of this source tree, or the
11 * OpenIB.org BSD license below:
12 *
13 * Redistribution and use in source and binary forms, with or
14 * without modification, are permitted provided that the following
15 * conditions are met:
16 *
17 * - Redistributions of source code must retain the above
18 * copyright notice, this list of conditions and the following
19 * disclaimer.
20 *
21 * - Redistributions in binary form must reproduce the above
22 * copyright notice, this list of conditions and the following
23 * disclaimer in the documentation and/or other materials
24 * provided with the distribution.
25 *
26 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
27 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
28 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
29 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
30 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
31 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
32 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
33 * SOFTWARE.
34 */
35
36 #include <linux/delay.h>
37 #include <linux/dma-mapping.h>
38 #include <linux/slab.h>
39
40 #include <linux/ip.h>
41 #include <linux/tcp.h>
42
43 #include "ipoib.h"
44
45 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG_DATA
46 static int data_debug_level;
47
48 module_param(data_debug_level, int, 0644);
49 MODULE_PARM_DESC(data_debug_level,
50 "Enable data path debug tracing if > 0");
51 #endif
52
53 static DEFINE_MUTEX(pkey_mutex);
54
ipoib_create_ah(struct net_device * dev,struct ib_pd * pd,struct ib_ah_attr * attr)55 struct ipoib_ah *ipoib_create_ah(struct net_device *dev,
56 struct ib_pd *pd, struct ib_ah_attr *attr)
57 {
58 struct ipoib_ah *ah;
59
60 ah = kmalloc(sizeof *ah, GFP_KERNEL);
61 if (!ah)
62 return NULL;
63
64 ah->dev = dev;
65 ah->last_send = 0;
66 kref_init(&ah->ref);
67
68 ah->ah = ib_create_ah(pd, attr);
69 if (IS_ERR(ah->ah)) {
70 kfree(ah);
71 ah = NULL;
72 } else
73 ipoib_dbg(netdev_priv(dev), "Created ah %p\n", ah->ah);
74
75 return ah;
76 }
77
ipoib_free_ah(struct kref * kref)78 void ipoib_free_ah(struct kref *kref)
79 {
80 struct ipoib_ah *ah = container_of(kref, struct ipoib_ah, ref);
81 struct ipoib_dev_priv *priv = netdev_priv(ah->dev);
82
83 unsigned long flags;
84
85 spin_lock_irqsave(&priv->lock, flags);
86 list_add_tail(&ah->list, &priv->dead_ahs);
87 spin_unlock_irqrestore(&priv->lock, flags);
88 }
89
ipoib_ud_dma_unmap_rx(struct ipoib_dev_priv * priv,u64 mapping[IPOIB_UD_RX_SG])90 static void ipoib_ud_dma_unmap_rx(struct ipoib_dev_priv *priv,
91 u64 mapping[IPOIB_UD_RX_SG])
92 {
93 if (ipoib_ud_need_sg(priv->max_ib_mtu)) {
94 ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_UD_HEAD_SIZE,
95 DMA_FROM_DEVICE);
96 ib_dma_unmap_page(priv->ca, mapping[1], PAGE_SIZE,
97 DMA_FROM_DEVICE);
98 } else
99 ib_dma_unmap_single(priv->ca, mapping[0],
100 IPOIB_UD_BUF_SIZE(priv->max_ib_mtu),
101 DMA_FROM_DEVICE);
102 }
103
ipoib_ud_skb_put_frags(struct ipoib_dev_priv * priv,struct sk_buff * skb,unsigned int length)104 static void ipoib_ud_skb_put_frags(struct ipoib_dev_priv *priv,
105 struct sk_buff *skb,
106 unsigned int length)
107 {
108 if (ipoib_ud_need_sg(priv->max_ib_mtu)) {
109 skb_frag_t *frag = &skb_shinfo(skb)->frags[0];
110 unsigned int size;
111 /*
112 * There is only two buffers needed for max_payload = 4K,
113 * first buf size is IPOIB_UD_HEAD_SIZE
114 */
115 skb->tail += IPOIB_UD_HEAD_SIZE;
116 skb->len += length;
117
118 size = length - IPOIB_UD_HEAD_SIZE;
119
120 frag->size = size;
121 skb->data_len += size;
122 skb->truesize += size;
123 } else
124 skb_put(skb, length);
125
126 }
127
ipoib_ib_post_receive(struct net_device * dev,int id)128 static int ipoib_ib_post_receive(struct net_device *dev, int id)
129 {
130 struct ipoib_dev_priv *priv = netdev_priv(dev);
131 struct ib_recv_wr *bad_wr;
132 int ret;
133
134 priv->rx_wr.wr_id = id | IPOIB_OP_RECV;
135 priv->rx_sge[0].addr = priv->rx_ring[id].mapping[0];
136 priv->rx_sge[1].addr = priv->rx_ring[id].mapping[1];
137
138
139 ret = ib_post_recv(priv->qp, &priv->rx_wr, &bad_wr);
140 if (unlikely(ret)) {
141 ipoib_warn(priv, "receive failed for buf %d (%d)\n", id, ret);
142 ipoib_ud_dma_unmap_rx(priv, priv->rx_ring[id].mapping);
143 dev_kfree_skb_any(priv->rx_ring[id].skb);
144 priv->rx_ring[id].skb = NULL;
145 }
146
147 return ret;
148 }
149
ipoib_alloc_rx_skb(struct net_device * dev,int id)150 static struct sk_buff *ipoib_alloc_rx_skb(struct net_device *dev, int id)
151 {
152 struct ipoib_dev_priv *priv = netdev_priv(dev);
153 struct sk_buff *skb;
154 int buf_size;
155 u64 *mapping;
156
157 if (ipoib_ud_need_sg(priv->max_ib_mtu))
158 buf_size = IPOIB_UD_HEAD_SIZE;
159 else
160 buf_size = IPOIB_UD_BUF_SIZE(priv->max_ib_mtu);
161
162 skb = dev_alloc_skb(buf_size + 4);
163 if (unlikely(!skb))
164 return NULL;
165
166 /*
167 * IB will leave a 40 byte gap for a GRH and IPoIB adds a 4 byte
168 * header. So we need 4 more bytes to get to 48 and align the
169 * IP header to a multiple of 16.
170 */
171 skb_reserve(skb, 4);
172
173 mapping = priv->rx_ring[id].mapping;
174 mapping[0] = ib_dma_map_single(priv->ca, skb->data, buf_size,
175 DMA_FROM_DEVICE);
176 if (unlikely(ib_dma_mapping_error(priv->ca, mapping[0])))
177 goto error;
178
179 if (ipoib_ud_need_sg(priv->max_ib_mtu)) {
180 struct page *page = alloc_page(GFP_ATOMIC);
181 if (!page)
182 goto partial_error;
183 skb_fill_page_desc(skb, 0, page, 0, PAGE_SIZE);
184 mapping[1] =
185 ib_dma_map_page(priv->ca, skb_shinfo(skb)->frags[0].page,
186 0, PAGE_SIZE, DMA_FROM_DEVICE);
187 if (unlikely(ib_dma_mapping_error(priv->ca, mapping[1])))
188 goto partial_error;
189 }
190
191 priv->rx_ring[id].skb = skb;
192 return skb;
193
194 partial_error:
195 ib_dma_unmap_single(priv->ca, mapping[0], buf_size, DMA_FROM_DEVICE);
196 error:
197 dev_kfree_skb_any(skb);
198 return NULL;
199 }
200
ipoib_ib_post_receives(struct net_device * dev)201 static int ipoib_ib_post_receives(struct net_device *dev)
202 {
203 struct ipoib_dev_priv *priv = netdev_priv(dev);
204 int i;
205
206 for (i = 0; i < ipoib_recvq_size; ++i) {
207 if (!ipoib_alloc_rx_skb(dev, i)) {
208 ipoib_warn(priv, "failed to allocate receive buffer %d\n", i);
209 return -ENOMEM;
210 }
211 if (ipoib_ib_post_receive(dev, i)) {
212 ipoib_warn(priv, "ipoib_ib_post_receive failed for buf %d\n", i);
213 return -EIO;
214 }
215 }
216
217 return 0;
218 }
219
ipoib_ib_handle_rx_wc(struct net_device * dev,struct ib_wc * wc)220 static void ipoib_ib_handle_rx_wc(struct net_device *dev, struct ib_wc *wc)
221 {
222 struct ipoib_dev_priv *priv = netdev_priv(dev);
223 unsigned int wr_id = wc->wr_id & ~IPOIB_OP_RECV;
224 struct sk_buff *skb;
225 u64 mapping[IPOIB_UD_RX_SG];
226 union ib_gid *dgid;
227
228 ipoib_dbg_data(priv, "recv completion: id %d, status: %d\n",
229 wr_id, wc->status);
230
231 if (unlikely(wr_id >= ipoib_recvq_size)) {
232 ipoib_warn(priv, "recv completion event with wrid %d (> %d)\n",
233 wr_id, ipoib_recvq_size);
234 return;
235 }
236
237 skb = priv->rx_ring[wr_id].skb;
238
239 if (unlikely(wc->status != IB_WC_SUCCESS)) {
240 if (wc->status != IB_WC_WR_FLUSH_ERR)
241 ipoib_warn(priv, "failed recv event "
242 "(status=%d, wrid=%d vend_err %x)\n",
243 wc->status, wr_id, wc->vendor_err);
244 ipoib_ud_dma_unmap_rx(priv, priv->rx_ring[wr_id].mapping);
245 dev_kfree_skb_any(skb);
246 priv->rx_ring[wr_id].skb = NULL;
247 return;
248 }
249
250 /*
251 * Drop packets that this interface sent, ie multicast packets
252 * that the HCA has replicated.
253 */
254 if (wc->slid == priv->local_lid && wc->src_qp == priv->qp->qp_num)
255 goto repost;
256
257 memcpy(mapping, priv->rx_ring[wr_id].mapping,
258 IPOIB_UD_RX_SG * sizeof *mapping);
259
260 /*
261 * If we can't allocate a new RX buffer, dump
262 * this packet and reuse the old buffer.
263 */
264 if (unlikely(!ipoib_alloc_rx_skb(dev, wr_id))) {
265 ++dev->stats.rx_dropped;
266 goto repost;
267 }
268
269 ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n",
270 wc->byte_len, wc->slid);
271
272 ipoib_ud_dma_unmap_rx(priv, mapping);
273 ipoib_ud_skb_put_frags(priv, skb, wc->byte_len);
274
275 /* First byte of dgid signals multicast when 0xff */
276 dgid = &((struct ib_grh *)skb->data)->dgid;
277
278 if (!(wc->wc_flags & IB_WC_GRH) || dgid->raw[0] != 0xff)
279 skb->pkt_type = PACKET_HOST;
280 else if (memcmp(dgid, dev->broadcast + 4, sizeof(union ib_gid)) == 0)
281 skb->pkt_type = PACKET_BROADCAST;
282 else
283 skb->pkt_type = PACKET_MULTICAST;
284
285 skb_pull(skb, IB_GRH_BYTES);
286
287 skb->protocol = ((struct ipoib_header *) skb->data)->proto;
288 skb_reset_mac_header(skb);
289 skb_pull(skb, IPOIB_ENCAP_LEN);
290
291 ++dev->stats.rx_packets;
292 dev->stats.rx_bytes += skb->len;
293
294 skb->dev = dev;
295 if (test_bit(IPOIB_FLAG_CSUM, &priv->flags) && likely(wc->csum_ok))
296 skb->ip_summed = CHECKSUM_UNNECESSARY;
297
298 napi_gro_receive(&priv->napi, skb);
299
300 repost:
301 if (unlikely(ipoib_ib_post_receive(dev, wr_id)))
302 ipoib_warn(priv, "ipoib_ib_post_receive failed "
303 "for buf %d\n", wr_id);
304 }
305
ipoib_dma_map_tx(struct ib_device * ca,struct ipoib_tx_buf * tx_req)306 static int ipoib_dma_map_tx(struct ib_device *ca,
307 struct ipoib_tx_buf *tx_req)
308 {
309 struct sk_buff *skb = tx_req->skb;
310 u64 *mapping = tx_req->mapping;
311 int i;
312 int off;
313
314 if (skb_headlen(skb)) {
315 mapping[0] = ib_dma_map_single(ca, skb->data, skb_headlen(skb),
316 DMA_TO_DEVICE);
317 if (unlikely(ib_dma_mapping_error(ca, mapping[0])))
318 return -EIO;
319
320 off = 1;
321 } else
322 off = 0;
323
324 for (i = 0; i < skb_shinfo(skb)->nr_frags; ++i) {
325 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
326 mapping[i + off] = ib_dma_map_page(ca, frag->page,
327 frag->page_offset, frag->size,
328 DMA_TO_DEVICE);
329 if (unlikely(ib_dma_mapping_error(ca, mapping[i + off])))
330 goto partial_error;
331 }
332 return 0;
333
334 partial_error:
335 for (; i > 0; --i) {
336 skb_frag_t *frag = &skb_shinfo(skb)->frags[i - 1];
337 ib_dma_unmap_page(ca, mapping[i - !off], frag->size, DMA_TO_DEVICE);
338 }
339
340 if (off)
341 ib_dma_unmap_single(ca, mapping[0], skb_headlen(skb), DMA_TO_DEVICE);
342
343 return -EIO;
344 }
345
ipoib_dma_unmap_tx(struct ib_device * ca,struct ipoib_tx_buf * tx_req)346 static void ipoib_dma_unmap_tx(struct ib_device *ca,
347 struct ipoib_tx_buf *tx_req)
348 {
349 struct sk_buff *skb = tx_req->skb;
350 u64 *mapping = tx_req->mapping;
351 int i;
352 int off;
353
354 if (skb_headlen(skb)) {
355 ib_dma_unmap_single(ca, mapping[0], skb_headlen(skb), DMA_TO_DEVICE);
356 off = 1;
357 } else
358 off = 0;
359
360 for (i = 0; i < skb_shinfo(skb)->nr_frags; ++i) {
361 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
362 ib_dma_unmap_page(ca, mapping[i + off], frag->size,
363 DMA_TO_DEVICE);
364 }
365 }
366
ipoib_ib_handle_tx_wc(struct net_device * dev,struct ib_wc * wc)367 static void ipoib_ib_handle_tx_wc(struct net_device *dev, struct ib_wc *wc)
368 {
369 struct ipoib_dev_priv *priv = netdev_priv(dev);
370 unsigned int wr_id = wc->wr_id;
371 struct ipoib_tx_buf *tx_req;
372
373 ipoib_dbg_data(priv, "send completion: id %d, status: %d\n",
374 wr_id, wc->status);
375
376 if (unlikely(wr_id >= ipoib_sendq_size)) {
377 ipoib_warn(priv, "send completion event with wrid %d (> %d)\n",
378 wr_id, ipoib_sendq_size);
379 return;
380 }
381
382 tx_req = &priv->tx_ring[wr_id];
383
384 ipoib_dma_unmap_tx(priv->ca, tx_req);
385
386 ++dev->stats.tx_packets;
387 dev->stats.tx_bytes += tx_req->skb->len;
388
389 dev_kfree_skb_any(tx_req->skb);
390
391 ++priv->tx_tail;
392 if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) &&
393 netif_queue_stopped(dev) &&
394 test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
395 netif_wake_queue(dev);
396
397 if (wc->status != IB_WC_SUCCESS &&
398 wc->status != IB_WC_WR_FLUSH_ERR)
399 ipoib_warn(priv, "failed send event "
400 "(status=%d, wrid=%d vend_err %x)\n",
401 wc->status, wr_id, wc->vendor_err);
402 }
403
poll_tx(struct ipoib_dev_priv * priv)404 static int poll_tx(struct ipoib_dev_priv *priv)
405 {
406 int n, i;
407
408 n = ib_poll_cq(priv->send_cq, MAX_SEND_CQE, priv->send_wc);
409 for (i = 0; i < n; ++i)
410 ipoib_ib_handle_tx_wc(priv->dev, priv->send_wc + i);
411
412 return n == MAX_SEND_CQE;
413 }
414
ipoib_poll(struct napi_struct * napi,int budget)415 int ipoib_poll(struct napi_struct *napi, int budget)
416 {
417 struct ipoib_dev_priv *priv = container_of(napi, struct ipoib_dev_priv, napi);
418 struct net_device *dev = priv->dev;
419 int done;
420 int t;
421 int n, i;
422
423 done = 0;
424
425 poll_more:
426 while (done < budget) {
427 int max = (budget - done);
428
429 t = min(IPOIB_NUM_WC, max);
430 n = ib_poll_cq(priv->recv_cq, t, priv->ibwc);
431
432 for (i = 0; i < n; i++) {
433 struct ib_wc *wc = priv->ibwc + i;
434
435 if (wc->wr_id & IPOIB_OP_RECV) {
436 ++done;
437 if (wc->wr_id & IPOIB_OP_CM)
438 ipoib_cm_handle_rx_wc(dev, wc);
439 else
440 ipoib_ib_handle_rx_wc(dev, wc);
441 } else
442 ipoib_cm_handle_tx_wc(priv->dev, wc);
443 }
444
445 if (n != t)
446 break;
447 }
448
449 if (done < budget) {
450 napi_complete(napi);
451 if (unlikely(ib_req_notify_cq(priv->recv_cq,
452 IB_CQ_NEXT_COMP |
453 IB_CQ_REPORT_MISSED_EVENTS)) &&
454 napi_reschedule(napi))
455 goto poll_more;
456 }
457
458 return done;
459 }
460
ipoib_ib_completion(struct ib_cq * cq,void * dev_ptr)461 void ipoib_ib_completion(struct ib_cq *cq, void *dev_ptr)
462 {
463 struct net_device *dev = dev_ptr;
464 struct ipoib_dev_priv *priv = netdev_priv(dev);
465
466 napi_schedule(&priv->napi);
467 }
468
drain_tx_cq(struct net_device * dev)469 static void drain_tx_cq(struct net_device *dev)
470 {
471 struct ipoib_dev_priv *priv = netdev_priv(dev);
472
473 netif_tx_lock(dev);
474 while (poll_tx(priv))
475 ; /* nothing */
476
477 if (netif_queue_stopped(dev))
478 mod_timer(&priv->poll_timer, jiffies + 1);
479
480 netif_tx_unlock(dev);
481 }
482
ipoib_send_comp_handler(struct ib_cq * cq,void * dev_ptr)483 void ipoib_send_comp_handler(struct ib_cq *cq, void *dev_ptr)
484 {
485 struct ipoib_dev_priv *priv = netdev_priv(dev_ptr);
486
487 mod_timer(&priv->poll_timer, jiffies);
488 }
489
post_send(struct ipoib_dev_priv * priv,unsigned int wr_id,struct ib_ah * address,u32 qpn,struct ipoib_tx_buf * tx_req,void * head,int hlen)490 static inline int post_send(struct ipoib_dev_priv *priv,
491 unsigned int wr_id,
492 struct ib_ah *address, u32 qpn,
493 struct ipoib_tx_buf *tx_req,
494 void *head, int hlen)
495 {
496 struct ib_send_wr *bad_wr;
497 int i, off;
498 struct sk_buff *skb = tx_req->skb;
499 skb_frag_t *frags = skb_shinfo(skb)->frags;
500 int nr_frags = skb_shinfo(skb)->nr_frags;
501 u64 *mapping = tx_req->mapping;
502
503 if (skb_headlen(skb)) {
504 priv->tx_sge[0].addr = mapping[0];
505 priv->tx_sge[0].length = skb_headlen(skb);
506 off = 1;
507 } else
508 off = 0;
509
510 for (i = 0; i < nr_frags; ++i) {
511 priv->tx_sge[i + off].addr = mapping[i + off];
512 priv->tx_sge[i + off].length = frags[i].size;
513 }
514 priv->tx_wr.num_sge = nr_frags + off;
515 priv->tx_wr.wr_id = wr_id;
516 priv->tx_wr.wr.ud.remote_qpn = qpn;
517 priv->tx_wr.wr.ud.ah = address;
518
519 if (head) {
520 priv->tx_wr.wr.ud.mss = skb_shinfo(skb)->gso_size;
521 priv->tx_wr.wr.ud.header = head;
522 priv->tx_wr.wr.ud.hlen = hlen;
523 priv->tx_wr.opcode = IB_WR_LSO;
524 } else
525 priv->tx_wr.opcode = IB_WR_SEND;
526
527 return ib_post_send(priv->qp, &priv->tx_wr, &bad_wr);
528 }
529
ipoib_send(struct net_device * dev,struct sk_buff * skb,struct ipoib_ah * address,u32 qpn)530 void ipoib_send(struct net_device *dev, struct sk_buff *skb,
531 struct ipoib_ah *address, u32 qpn)
532 {
533 struct ipoib_dev_priv *priv = netdev_priv(dev);
534 struct ipoib_tx_buf *tx_req;
535 int hlen, rc;
536 void *phead;
537
538 if (skb_is_gso(skb)) {
539 hlen = skb_transport_offset(skb) + tcp_hdrlen(skb);
540 phead = skb->data;
541 if (unlikely(!skb_pull(skb, hlen))) {
542 ipoib_warn(priv, "linear data too small\n");
543 ++dev->stats.tx_dropped;
544 ++dev->stats.tx_errors;
545 dev_kfree_skb_any(skb);
546 return;
547 }
548 } else {
549 if (unlikely(skb->len > priv->mcast_mtu + IPOIB_ENCAP_LEN)) {
550 ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n",
551 skb->len, priv->mcast_mtu + IPOIB_ENCAP_LEN);
552 ++dev->stats.tx_dropped;
553 ++dev->stats.tx_errors;
554 ipoib_cm_skb_too_long(dev, skb, priv->mcast_mtu);
555 return;
556 }
557 phead = NULL;
558 hlen = 0;
559 }
560
561 ipoib_dbg_data(priv, "sending packet, length=%d address=%p qpn=0x%06x\n",
562 skb->len, address, qpn);
563
564 /*
565 * We put the skb into the tx_ring _before_ we call post_send()
566 * because it's entirely possible that the completion handler will
567 * run before we execute anything after the post_send(). That
568 * means we have to make sure everything is properly recorded and
569 * our state is consistent before we call post_send().
570 */
571 tx_req = &priv->tx_ring[priv->tx_head & (ipoib_sendq_size - 1)];
572 tx_req->skb = skb;
573 if (unlikely(ipoib_dma_map_tx(priv->ca, tx_req))) {
574 ++dev->stats.tx_errors;
575 dev_kfree_skb_any(skb);
576 return;
577 }
578
579 if (skb->ip_summed == CHECKSUM_PARTIAL)
580 priv->tx_wr.send_flags |= IB_SEND_IP_CSUM;
581 else
582 priv->tx_wr.send_flags &= ~IB_SEND_IP_CSUM;
583
584 if (++priv->tx_outstanding == ipoib_sendq_size) {
585 ipoib_dbg(priv, "TX ring full, stopping kernel net queue\n");
586 if (ib_req_notify_cq(priv->send_cq, IB_CQ_NEXT_COMP))
587 ipoib_warn(priv, "request notify on send CQ failed\n");
588 netif_stop_queue(dev);
589 }
590
591 rc = post_send(priv, priv->tx_head & (ipoib_sendq_size - 1),
592 address->ah, qpn, tx_req, phead, hlen);
593 if (unlikely(rc)) {
594 ipoib_warn(priv, "post_send failed, error %d\n", rc);
595 ++dev->stats.tx_errors;
596 --priv->tx_outstanding;
597 ipoib_dma_unmap_tx(priv->ca, tx_req);
598 dev_kfree_skb_any(skb);
599 if (netif_queue_stopped(dev))
600 netif_wake_queue(dev);
601 } else {
602 dev->trans_start = jiffies;
603
604 address->last_send = priv->tx_head;
605 ++priv->tx_head;
606 skb_orphan(skb);
607
608 }
609
610 if (unlikely(priv->tx_outstanding > MAX_SEND_CQE))
611 while (poll_tx(priv))
612 ; /* nothing */
613 }
614
__ipoib_reap_ah(struct net_device * dev)615 static void __ipoib_reap_ah(struct net_device *dev)
616 {
617 struct ipoib_dev_priv *priv = netdev_priv(dev);
618 struct ipoib_ah *ah, *tah;
619 LIST_HEAD(remove_list);
620 unsigned long flags;
621
622 netif_tx_lock_bh(dev);
623 spin_lock_irqsave(&priv->lock, flags);
624
625 list_for_each_entry_safe(ah, tah, &priv->dead_ahs, list)
626 if ((int) priv->tx_tail - (int) ah->last_send >= 0) {
627 list_del(&ah->list);
628 ib_destroy_ah(ah->ah);
629 kfree(ah);
630 }
631
632 spin_unlock_irqrestore(&priv->lock, flags);
633 netif_tx_unlock_bh(dev);
634 }
635
ipoib_reap_ah(struct work_struct * work)636 void ipoib_reap_ah(struct work_struct *work)
637 {
638 struct ipoib_dev_priv *priv =
639 container_of(work, struct ipoib_dev_priv, ah_reap_task.work);
640 struct net_device *dev = priv->dev;
641
642 __ipoib_reap_ah(dev);
643
644 if (!test_bit(IPOIB_STOP_REAPER, &priv->flags))
645 queue_delayed_work(ipoib_workqueue, &priv->ah_reap_task,
646 round_jiffies_relative(HZ));
647 }
648
ipoib_ib_tx_timer_func(unsigned long ctx)649 static void ipoib_ib_tx_timer_func(unsigned long ctx)
650 {
651 drain_tx_cq((struct net_device *)ctx);
652 }
653
ipoib_ib_dev_open(struct net_device * dev)654 int ipoib_ib_dev_open(struct net_device *dev)
655 {
656 struct ipoib_dev_priv *priv = netdev_priv(dev);
657 int ret;
658
659 if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &priv->pkey_index)) {
660 ipoib_warn(priv, "P_Key 0x%04x not found\n", priv->pkey);
661 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
662 return -1;
663 }
664 set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
665
666 ret = ipoib_init_qp(dev);
667 if (ret) {
668 ipoib_warn(priv, "ipoib_init_qp returned %d\n", ret);
669 return -1;
670 }
671
672 ret = ipoib_ib_post_receives(dev);
673 if (ret) {
674 ipoib_warn(priv, "ipoib_ib_post_receives returned %d\n", ret);
675 ipoib_ib_dev_stop(dev, 1);
676 return -1;
677 }
678
679 ret = ipoib_cm_dev_open(dev);
680 if (ret) {
681 ipoib_warn(priv, "ipoib_cm_dev_open returned %d\n", ret);
682 ipoib_ib_dev_stop(dev, 1);
683 return -1;
684 }
685
686 clear_bit(IPOIB_STOP_REAPER, &priv->flags);
687 queue_delayed_work(ipoib_workqueue, &priv->ah_reap_task,
688 round_jiffies_relative(HZ));
689
690 if (!test_and_set_bit(IPOIB_FLAG_INITIALIZED, &priv->flags))
691 napi_enable(&priv->napi);
692
693 return 0;
694 }
695
ipoib_pkey_dev_check_presence(struct net_device * dev)696 static void ipoib_pkey_dev_check_presence(struct net_device *dev)
697 {
698 struct ipoib_dev_priv *priv = netdev_priv(dev);
699 u16 pkey_index = 0;
700
701 if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &pkey_index))
702 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
703 else
704 set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
705 }
706
ipoib_ib_dev_up(struct net_device * dev)707 int ipoib_ib_dev_up(struct net_device *dev)
708 {
709 struct ipoib_dev_priv *priv = netdev_priv(dev);
710
711 ipoib_pkey_dev_check_presence(dev);
712
713 if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
714 ipoib_dbg(priv, "PKEY is not assigned.\n");
715 return 0;
716 }
717
718 set_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
719
720 return ipoib_mcast_start_thread(dev);
721 }
722
ipoib_ib_dev_down(struct net_device * dev,int flush)723 int ipoib_ib_dev_down(struct net_device *dev, int flush)
724 {
725 struct ipoib_dev_priv *priv = netdev_priv(dev);
726
727 ipoib_dbg(priv, "downing ib_dev\n");
728
729 clear_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
730 netif_carrier_off(dev);
731
732 /* Shutdown the P_Key thread if still active */
733 if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
734 mutex_lock(&pkey_mutex);
735 set_bit(IPOIB_PKEY_STOP, &priv->flags);
736 cancel_delayed_work(&priv->pkey_poll_task);
737 mutex_unlock(&pkey_mutex);
738 if (flush)
739 flush_workqueue(ipoib_workqueue);
740 }
741
742 ipoib_mcast_stop_thread(dev, flush);
743 ipoib_mcast_dev_flush(dev);
744
745 ipoib_flush_paths(dev);
746
747 return 0;
748 }
749
recvs_pending(struct net_device * dev)750 static int recvs_pending(struct net_device *dev)
751 {
752 struct ipoib_dev_priv *priv = netdev_priv(dev);
753 int pending = 0;
754 int i;
755
756 for (i = 0; i < ipoib_recvq_size; ++i)
757 if (priv->rx_ring[i].skb)
758 ++pending;
759
760 return pending;
761 }
762
ipoib_drain_cq(struct net_device * dev)763 void ipoib_drain_cq(struct net_device *dev)
764 {
765 struct ipoib_dev_priv *priv = netdev_priv(dev);
766 int i, n;
767
768 /*
769 * We call completion handling routines that expect to be
770 * called from the BH-disabled NAPI poll context, so disable
771 * BHs here too.
772 */
773 local_bh_disable();
774
775 do {
776 n = ib_poll_cq(priv->recv_cq, IPOIB_NUM_WC, priv->ibwc);
777 for (i = 0; i < n; ++i) {
778 /*
779 * Convert any successful completions to flush
780 * errors to avoid passing packets up the
781 * stack after bringing the device down.
782 */
783 if (priv->ibwc[i].status == IB_WC_SUCCESS)
784 priv->ibwc[i].status = IB_WC_WR_FLUSH_ERR;
785
786 if (priv->ibwc[i].wr_id & IPOIB_OP_RECV) {
787 if (priv->ibwc[i].wr_id & IPOIB_OP_CM)
788 ipoib_cm_handle_rx_wc(dev, priv->ibwc + i);
789 else
790 ipoib_ib_handle_rx_wc(dev, priv->ibwc + i);
791 } else
792 ipoib_cm_handle_tx_wc(dev, priv->ibwc + i);
793 }
794 } while (n == IPOIB_NUM_WC);
795
796 while (poll_tx(priv))
797 ; /* nothing */
798
799 local_bh_enable();
800 }
801
ipoib_ib_dev_stop(struct net_device * dev,int flush)802 int ipoib_ib_dev_stop(struct net_device *dev, int flush)
803 {
804 struct ipoib_dev_priv *priv = netdev_priv(dev);
805 struct ib_qp_attr qp_attr;
806 unsigned long begin;
807 struct ipoib_tx_buf *tx_req;
808 int i;
809
810 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &priv->flags))
811 napi_disable(&priv->napi);
812
813 ipoib_cm_dev_stop(dev);
814
815 /*
816 * Move our QP to the error state and then reinitialize in
817 * when all work requests have completed or have been flushed.
818 */
819 qp_attr.qp_state = IB_QPS_ERR;
820 if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
821 ipoib_warn(priv, "Failed to modify QP to ERROR state\n");
822
823 /* Wait for all sends and receives to complete */
824 begin = jiffies;
825
826 while (priv->tx_head != priv->tx_tail || recvs_pending(dev)) {
827 if (time_after(jiffies, begin + 5 * HZ)) {
828 ipoib_warn(priv, "timing out; %d sends %d receives not completed\n",
829 priv->tx_head - priv->tx_tail, recvs_pending(dev));
830
831 /*
832 * assume the HW is wedged and just free up
833 * all our pending work requests.
834 */
835 while ((int) priv->tx_tail - (int) priv->tx_head < 0) {
836 tx_req = &priv->tx_ring[priv->tx_tail &
837 (ipoib_sendq_size - 1)];
838 ipoib_dma_unmap_tx(priv->ca, tx_req);
839 dev_kfree_skb_any(tx_req->skb);
840 ++priv->tx_tail;
841 --priv->tx_outstanding;
842 }
843
844 for (i = 0; i < ipoib_recvq_size; ++i) {
845 struct ipoib_rx_buf *rx_req;
846
847 rx_req = &priv->rx_ring[i];
848 if (!rx_req->skb)
849 continue;
850 ipoib_ud_dma_unmap_rx(priv,
851 priv->rx_ring[i].mapping);
852 dev_kfree_skb_any(rx_req->skb);
853 rx_req->skb = NULL;
854 }
855
856 goto timeout;
857 }
858
859 ipoib_drain_cq(dev);
860
861 msleep(1);
862 }
863
864 ipoib_dbg(priv, "All sends and receives done.\n");
865
866 timeout:
867 del_timer_sync(&priv->poll_timer);
868 qp_attr.qp_state = IB_QPS_RESET;
869 if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
870 ipoib_warn(priv, "Failed to modify QP to RESET state\n");
871
872 /* Wait for all AHs to be reaped */
873 set_bit(IPOIB_STOP_REAPER, &priv->flags);
874 cancel_delayed_work(&priv->ah_reap_task);
875 if (flush)
876 flush_workqueue(ipoib_workqueue);
877
878 begin = jiffies;
879
880 while (!list_empty(&priv->dead_ahs)) {
881 __ipoib_reap_ah(dev);
882
883 if (time_after(jiffies, begin + HZ)) {
884 ipoib_warn(priv, "timing out; will leak address handles\n");
885 break;
886 }
887
888 msleep(1);
889 }
890
891 ib_req_notify_cq(priv->recv_cq, IB_CQ_NEXT_COMP);
892
893 return 0;
894 }
895
ipoib_ib_dev_init(struct net_device * dev,struct ib_device * ca,int port)896 int ipoib_ib_dev_init(struct net_device *dev, struct ib_device *ca, int port)
897 {
898 struct ipoib_dev_priv *priv = netdev_priv(dev);
899
900 priv->ca = ca;
901 priv->port = port;
902 priv->qp = NULL;
903
904 if (ipoib_transport_dev_init(dev, ca)) {
905 printk(KERN_WARNING "%s: ipoib_transport_dev_init failed\n", ca->name);
906 return -ENODEV;
907 }
908
909 setup_timer(&priv->poll_timer, ipoib_ib_tx_timer_func,
910 (unsigned long) dev);
911
912 if (dev->flags & IFF_UP) {
913 if (ipoib_ib_dev_open(dev)) {
914 ipoib_transport_dev_cleanup(dev);
915 return -ENODEV;
916 }
917 }
918
919 return 0;
920 }
921
__ipoib_ib_dev_flush(struct ipoib_dev_priv * priv,enum ipoib_flush_level level)922 static void __ipoib_ib_dev_flush(struct ipoib_dev_priv *priv,
923 enum ipoib_flush_level level)
924 {
925 struct ipoib_dev_priv *cpriv;
926 struct net_device *dev = priv->dev;
927 u16 new_index;
928
929 mutex_lock(&priv->vlan_mutex);
930
931 /*
932 * Flush any child interfaces too -- they might be up even if
933 * the parent is down.
934 */
935 list_for_each_entry(cpriv, &priv->child_intfs, list)
936 __ipoib_ib_dev_flush(cpriv, level);
937
938 mutex_unlock(&priv->vlan_mutex);
939
940 if (!test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags)) {
941 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_INITIALIZED not set.\n");
942 return;
943 }
944
945 if (!test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) {
946 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_ADMIN_UP not set.\n");
947 return;
948 }
949
950 if (level == IPOIB_FLUSH_HEAVY) {
951 if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &new_index)) {
952 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
953 ipoib_ib_dev_down(dev, 0);
954 ipoib_ib_dev_stop(dev, 0);
955 if (ipoib_pkey_dev_delay_open(dev))
956 return;
957 }
958
959 /* restart QP only if P_Key index is changed */
960 if (test_and_set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags) &&
961 new_index == priv->pkey_index) {
962 ipoib_dbg(priv, "Not flushing - P_Key index not changed.\n");
963 return;
964 }
965 priv->pkey_index = new_index;
966 }
967
968 if (level == IPOIB_FLUSH_LIGHT) {
969 ipoib_mark_paths_invalid(dev);
970 ipoib_mcast_dev_flush(dev);
971 }
972
973 if (level >= IPOIB_FLUSH_NORMAL)
974 ipoib_ib_dev_down(dev, 0);
975
976 if (level == IPOIB_FLUSH_HEAVY) {
977 ipoib_ib_dev_stop(dev, 0);
978 ipoib_ib_dev_open(dev);
979 }
980
981 /*
982 * The device could have been brought down between the start and when
983 * we get here, don't bring it back up if it's not configured up
984 */
985 if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) {
986 if (level >= IPOIB_FLUSH_NORMAL)
987 ipoib_ib_dev_up(dev);
988 ipoib_mcast_restart_task(&priv->restart_task);
989 }
990 }
991
ipoib_ib_dev_flush_light(struct work_struct * work)992 void ipoib_ib_dev_flush_light(struct work_struct *work)
993 {
994 struct ipoib_dev_priv *priv =
995 container_of(work, struct ipoib_dev_priv, flush_light);
996
997 __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_LIGHT);
998 }
999
ipoib_ib_dev_flush_normal(struct work_struct * work)1000 void ipoib_ib_dev_flush_normal(struct work_struct *work)
1001 {
1002 struct ipoib_dev_priv *priv =
1003 container_of(work, struct ipoib_dev_priv, flush_normal);
1004
1005 __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_NORMAL);
1006 }
1007
ipoib_ib_dev_flush_heavy(struct work_struct * work)1008 void ipoib_ib_dev_flush_heavy(struct work_struct *work)
1009 {
1010 struct ipoib_dev_priv *priv =
1011 container_of(work, struct ipoib_dev_priv, flush_heavy);
1012
1013 __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_HEAVY);
1014 }
1015
ipoib_ib_dev_cleanup(struct net_device * dev)1016 void ipoib_ib_dev_cleanup(struct net_device *dev)
1017 {
1018 struct ipoib_dev_priv *priv = netdev_priv(dev);
1019
1020 ipoib_dbg(priv, "cleaning up ib_dev\n");
1021
1022 ipoib_mcast_stop_thread(dev, 1);
1023 ipoib_mcast_dev_flush(dev);
1024
1025 ipoib_transport_dev_cleanup(dev);
1026 }
1027
1028 /*
1029 * Delayed P_Key Assigment Interim Support
1030 *
1031 * The following is initial implementation of delayed P_Key assigment
1032 * mechanism. It is using the same approach implemented for the multicast
1033 * group join. The single goal of this implementation is to quickly address
1034 * Bug #2507. This implementation will probably be removed when the P_Key
1035 * change async notification is available.
1036 */
1037
ipoib_pkey_poll(struct work_struct * work)1038 void ipoib_pkey_poll(struct work_struct *work)
1039 {
1040 struct ipoib_dev_priv *priv =
1041 container_of(work, struct ipoib_dev_priv, pkey_poll_task.work);
1042 struct net_device *dev = priv->dev;
1043
1044 ipoib_pkey_dev_check_presence(dev);
1045
1046 if (test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags))
1047 ipoib_open(dev);
1048 else {
1049 mutex_lock(&pkey_mutex);
1050 if (!test_bit(IPOIB_PKEY_STOP, &priv->flags))
1051 queue_delayed_work(ipoib_workqueue,
1052 &priv->pkey_poll_task,
1053 HZ);
1054 mutex_unlock(&pkey_mutex);
1055 }
1056 }
1057
ipoib_pkey_dev_delay_open(struct net_device * dev)1058 int ipoib_pkey_dev_delay_open(struct net_device *dev)
1059 {
1060 struct ipoib_dev_priv *priv = netdev_priv(dev);
1061
1062 /* Look for the interface pkey value in the IB Port P_Key table and */
1063 /* set the interface pkey assigment flag */
1064 ipoib_pkey_dev_check_presence(dev);
1065
1066 /* P_Key value not assigned yet - start polling */
1067 if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
1068 mutex_lock(&pkey_mutex);
1069 clear_bit(IPOIB_PKEY_STOP, &priv->flags);
1070 queue_delayed_work(ipoib_workqueue,
1071 &priv->pkey_poll_task,
1072 HZ);
1073 mutex_unlock(&pkey_mutex);
1074 return 1;
1075 }
1076
1077 return 0;
1078 }
1079