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196b1d13cbcbc09548e92a4be6c9a18cdc6aae36
[deliverable/linux.git] / drivers / infiniband / ulp / ipoib / ipoib_ib.c
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/moduleparam.h>
38 #include <linux/dma-mapping.h>
39 #include <linux/slab.h>
40
41 #include <linux/ip.h>
42 #include <linux/tcp.h>
43
44 #include "ipoib.h"
45
46 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG_DATA
47 static int data_debug_level;
48
49 module_param(data_debug_level, int, 0644);
50 MODULE_PARM_DESC(data_debug_level,
51 "Enable data path debug tracing if > 0");
52 #endif
53
54 static DEFINE_MUTEX(pkey_mutex);
55
56 struct ipoib_ah *ipoib_create_ah(struct net_device *dev,
57 struct ib_pd *pd, struct ib_ah_attr *attr)
58 {
59 struct ipoib_ah *ah;
60 struct ib_ah *vah;
61
62 ah = kmalloc(sizeof *ah, GFP_KERNEL);
63 if (!ah)
64 return ERR_PTR(-ENOMEM);
65
66 ah->dev = dev;
67 ah->last_send = 0;
68 kref_init(&ah->ref);
69
70 vah = ib_create_ah(pd, attr);
71 if (IS_ERR(vah)) {
72 kfree(ah);
73 ah = (struct ipoib_ah *)vah;
74 } else {
75 ah->ah = vah;
76 ipoib_dbg(netdev_priv(dev), "Created ah %p\n", ah->ah);
77 }
78
79 return ah;
80 }
81
82 void ipoib_free_ah(struct kref *kref)
83 {
84 struct ipoib_ah *ah = container_of(kref, struct ipoib_ah, ref);
85 struct ipoib_dev_priv *priv = netdev_priv(ah->dev);
86
87 unsigned long flags;
88
89 spin_lock_irqsave(&priv->lock, flags);
90 list_add_tail(&ah->list, &priv->dead_ahs);
91 spin_unlock_irqrestore(&priv->lock, flags);
92 }
93
94 static void ipoib_ud_dma_unmap_rx(struct ipoib_dev_priv *priv,
95 u64 mapping[IPOIB_UD_RX_SG])
96 {
97 if (ipoib_ud_need_sg(priv->max_ib_mtu)) {
98 ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_UD_HEAD_SIZE,
99 DMA_FROM_DEVICE);
100 ib_dma_unmap_page(priv->ca, mapping[1], PAGE_SIZE,
101 DMA_FROM_DEVICE);
102 } else
103 ib_dma_unmap_single(priv->ca, mapping[0],
104 IPOIB_UD_BUF_SIZE(priv->max_ib_mtu),
105 DMA_FROM_DEVICE);
106 }
107
108 static void ipoib_ud_skb_put_frags(struct ipoib_dev_priv *priv,
109 struct sk_buff *skb,
110 unsigned int length)
111 {
112 if (ipoib_ud_need_sg(priv->max_ib_mtu)) {
113 skb_frag_t *frag = &skb_shinfo(skb)->frags[0];
114 unsigned int size;
115 /*
116 * There is only two buffers needed for max_payload = 4K,
117 * first buf size is IPOIB_UD_HEAD_SIZE
118 */
119 skb->tail += IPOIB_UD_HEAD_SIZE;
120 skb->len += length;
121
122 size = length - IPOIB_UD_HEAD_SIZE;
123
124 skb_frag_size_set(frag, size);
125 skb->data_len += size;
126 skb->truesize += PAGE_SIZE;
127 } else
128 skb_put(skb, length);
129
130 }
131
132 static int ipoib_ib_post_receive(struct net_device *dev, int id)
133 {
134 struct ipoib_dev_priv *priv = netdev_priv(dev);
135 struct ib_recv_wr *bad_wr;
136 int ret;
137
138 priv->rx_wr.wr_id = id | IPOIB_OP_RECV;
139 priv->rx_sge[0].addr = priv->rx_ring[id].mapping[0];
140 priv->rx_sge[1].addr = priv->rx_ring[id].mapping[1];
141
142
143 ret = ib_post_recv(priv->qp, &priv->rx_wr, &bad_wr);
144 if (unlikely(ret)) {
145 ipoib_warn(priv, "receive failed for buf %d (%d)\n", id, ret);
146 ipoib_ud_dma_unmap_rx(priv, priv->rx_ring[id].mapping);
147 dev_kfree_skb_any(priv->rx_ring[id].skb);
148 priv->rx_ring[id].skb = NULL;
149 }
150
151 return ret;
152 }
153
154 static struct sk_buff *ipoib_alloc_rx_skb(struct net_device *dev, int id)
155 {
156 struct ipoib_dev_priv *priv = netdev_priv(dev);
157 struct sk_buff *skb;
158 int buf_size;
159 int tailroom;
160 u64 *mapping;
161
162 if (ipoib_ud_need_sg(priv->max_ib_mtu)) {
163 buf_size = IPOIB_UD_HEAD_SIZE;
164 tailroom = 128; /* reserve some tailroom for IP/TCP headers */
165 } else {
166 buf_size = IPOIB_UD_BUF_SIZE(priv->max_ib_mtu);
167 tailroom = 0;
168 }
169
170 skb = dev_alloc_skb(buf_size + tailroom + 4);
171 if (unlikely(!skb))
172 return NULL;
173
174 /*
175 * IB will leave a 40 byte gap for a GRH and IPoIB adds a 4 byte
176 * header. So we need 4 more bytes to get to 48 and align the
177 * IP header to a multiple of 16.
178 */
179 skb_reserve(skb, 4);
180
181 mapping = priv->rx_ring[id].mapping;
182 mapping[0] = ib_dma_map_single(priv->ca, skb->data, buf_size,
183 DMA_FROM_DEVICE);
184 if (unlikely(ib_dma_mapping_error(priv->ca, mapping[0])))
185 goto error;
186
187 if (ipoib_ud_need_sg(priv->max_ib_mtu)) {
188 struct page *page = alloc_page(GFP_ATOMIC);
189 if (!page)
190 goto partial_error;
191 skb_fill_page_desc(skb, 0, page, 0, PAGE_SIZE);
192 mapping[1] =
193 ib_dma_map_page(priv->ca, page,
194 0, PAGE_SIZE, DMA_FROM_DEVICE);
195 if (unlikely(ib_dma_mapping_error(priv->ca, mapping[1])))
196 goto partial_error;
197 }
198
199 priv->rx_ring[id].skb = skb;
200 return skb;
201
202 partial_error:
203 ib_dma_unmap_single(priv->ca, mapping[0], buf_size, DMA_FROM_DEVICE);
204 error:
205 dev_kfree_skb_any(skb);
206 return NULL;
207 }
208
209 static int ipoib_ib_post_receives(struct net_device *dev)
210 {
211 struct ipoib_dev_priv *priv = netdev_priv(dev);
212 int i;
213
214 for (i = 0; i < ipoib_recvq_size; ++i) {
215 if (!ipoib_alloc_rx_skb(dev, i)) {
216 ipoib_warn(priv, "failed to allocate receive buffer %d\n", i);
217 return -ENOMEM;
218 }
219 if (ipoib_ib_post_receive(dev, i)) {
220 ipoib_warn(priv, "ipoib_ib_post_receive failed for buf %d\n", i);
221 return -EIO;
222 }
223 }
224
225 return 0;
226 }
227
228 static void ipoib_ib_handle_rx_wc(struct net_device *dev, struct ib_wc *wc)
229 {
230 struct ipoib_dev_priv *priv = netdev_priv(dev);
231 unsigned int wr_id = wc->wr_id & ~IPOIB_OP_RECV;
232 struct sk_buff *skb;
233 u64 mapping[IPOIB_UD_RX_SG];
234 union ib_gid *dgid;
235
236 ipoib_dbg_data(priv, "recv completion: id %d, status: %d\n",
237 wr_id, wc->status);
238
239 if (unlikely(wr_id >= ipoib_recvq_size)) {
240 ipoib_warn(priv, "recv completion event with wrid %d (> %d)\n",
241 wr_id, ipoib_recvq_size);
242 return;
243 }
244
245 skb = priv->rx_ring[wr_id].skb;
246
247 if (unlikely(wc->status != IB_WC_SUCCESS)) {
248 if (wc->status != IB_WC_WR_FLUSH_ERR)
249 ipoib_warn(priv, "failed recv event "
250 "(status=%d, wrid=%d vend_err %x)\n",
251 wc->status, wr_id, wc->vendor_err);
252 ipoib_ud_dma_unmap_rx(priv, priv->rx_ring[wr_id].mapping);
253 dev_kfree_skb_any(skb);
254 priv->rx_ring[wr_id].skb = NULL;
255 return;
256 }
257
258 /*
259 * Drop packets that this interface sent, ie multicast packets
260 * that the HCA has replicated.
261 */
262 if (wc->slid == priv->local_lid && wc->src_qp == priv->qp->qp_num)
263 goto repost;
264
265 memcpy(mapping, priv->rx_ring[wr_id].mapping,
266 IPOIB_UD_RX_SG * sizeof *mapping);
267
268 /*
269 * If we can't allocate a new RX buffer, dump
270 * this packet and reuse the old buffer.
271 */
272 if (unlikely(!ipoib_alloc_rx_skb(dev, wr_id))) {
273 ++dev->stats.rx_dropped;
274 goto repost;
275 }
276
277 ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n",
278 wc->byte_len, wc->slid);
279
280 ipoib_ud_dma_unmap_rx(priv, mapping);
281 ipoib_ud_skb_put_frags(priv, skb, wc->byte_len);
282
283 /* First byte of dgid signals multicast when 0xff */
284 dgid = &((struct ib_grh *)skb->data)->dgid;
285
286 if (!(wc->wc_flags & IB_WC_GRH) || dgid->raw[0] != 0xff)
287 skb->pkt_type = PACKET_HOST;
288 else if (memcmp(dgid, dev->broadcast + 4, sizeof(union ib_gid)) == 0)
289 skb->pkt_type = PACKET_BROADCAST;
290 else
291 skb->pkt_type = PACKET_MULTICAST;
292
293 skb_pull(skb, IB_GRH_BYTES);
294
295 skb->protocol = ((struct ipoib_header *) skb->data)->proto;
296 skb_reset_mac_header(skb);
297 skb_pull(skb, IPOIB_ENCAP_LEN);
298
299 ++dev->stats.rx_packets;
300 dev->stats.rx_bytes += skb->len;
301
302 skb->dev = dev;
303 if ((dev->features & NETIF_F_RXCSUM) &&
304 likely(wc->wc_flags & IB_WC_IP_CSUM_OK))
305 skb->ip_summed = CHECKSUM_UNNECESSARY;
306
307 napi_gro_receive(&priv->napi, skb);
308
309 repost:
310 if (unlikely(ipoib_ib_post_receive(dev, wr_id)))
311 ipoib_warn(priv, "ipoib_ib_post_receive failed "
312 "for buf %d\n", wr_id);
313 }
314
315 static int ipoib_dma_map_tx(struct ib_device *ca,
316 struct ipoib_tx_buf *tx_req)
317 {
318 struct sk_buff *skb = tx_req->skb;
319 u64 *mapping = tx_req->mapping;
320 int i;
321 int off;
322
323 if (skb_headlen(skb)) {
324 mapping[0] = ib_dma_map_single(ca, skb->data, skb_headlen(skb),
325 DMA_TO_DEVICE);
326 if (unlikely(ib_dma_mapping_error(ca, mapping[0])))
327 return -EIO;
328
329 off = 1;
330 } else
331 off = 0;
332
333 for (i = 0; i < skb_shinfo(skb)->nr_frags; ++i) {
334 const skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
335 mapping[i + off] = ib_dma_map_page(ca,
336 skb_frag_page(frag),
337 frag->page_offset, skb_frag_size(frag),
338 DMA_TO_DEVICE);
339 if (unlikely(ib_dma_mapping_error(ca, mapping[i + off])))
340 goto partial_error;
341 }
342 return 0;
343
344 partial_error:
345 for (; i > 0; --i) {
346 const skb_frag_t *frag = &skb_shinfo(skb)->frags[i - 1];
347
348 ib_dma_unmap_page(ca, mapping[i - !off], skb_frag_size(frag), DMA_TO_DEVICE);
349 }
350
351 if (off)
352 ib_dma_unmap_single(ca, mapping[0], skb_headlen(skb), DMA_TO_DEVICE);
353
354 return -EIO;
355 }
356
357 static void ipoib_dma_unmap_tx(struct ib_device *ca,
358 struct ipoib_tx_buf *tx_req)
359 {
360 struct sk_buff *skb = tx_req->skb;
361 u64 *mapping = tx_req->mapping;
362 int i;
363 int off;
364
365 if (skb_headlen(skb)) {
366 ib_dma_unmap_single(ca, mapping[0], skb_headlen(skb), DMA_TO_DEVICE);
367 off = 1;
368 } else
369 off = 0;
370
371 for (i = 0; i < skb_shinfo(skb)->nr_frags; ++i) {
372 const skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
373
374 ib_dma_unmap_page(ca, mapping[i + off], skb_frag_size(frag),
375 DMA_TO_DEVICE);
376 }
377 }
378
379 static void ipoib_ib_handle_tx_wc(struct net_device *dev, struct ib_wc *wc)
380 {
381 struct ipoib_dev_priv *priv = netdev_priv(dev);
382 unsigned int wr_id = wc->wr_id;
383 struct ipoib_tx_buf *tx_req;
384
385 ipoib_dbg_data(priv, "send completion: id %d, status: %d\n",
386 wr_id, wc->status);
387
388 if (unlikely(wr_id >= ipoib_sendq_size)) {
389 ipoib_warn(priv, "send completion event with wrid %d (> %d)\n",
390 wr_id, ipoib_sendq_size);
391 return;
392 }
393
394 tx_req = &priv->tx_ring[wr_id];
395
396 ipoib_dma_unmap_tx(priv->ca, tx_req);
397
398 ++dev->stats.tx_packets;
399 dev->stats.tx_bytes += tx_req->skb->len;
400
401 dev_kfree_skb_any(tx_req->skb);
402
403 ++priv->tx_tail;
404 if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) &&
405 netif_queue_stopped(dev) &&
406 test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
407 netif_wake_queue(dev);
408
409 if (wc->status != IB_WC_SUCCESS &&
410 wc->status != IB_WC_WR_FLUSH_ERR)
411 ipoib_warn(priv, "failed send event "
412 "(status=%d, wrid=%d vend_err %x)\n",
413 wc->status, wr_id, wc->vendor_err);
414 }
415
416 static int poll_tx(struct ipoib_dev_priv *priv)
417 {
418 int n, i;
419
420 n = ib_poll_cq(priv->send_cq, MAX_SEND_CQE, priv->send_wc);
421 for (i = 0; i < n; ++i)
422 ipoib_ib_handle_tx_wc(priv->dev, priv->send_wc + i);
423
424 return n == MAX_SEND_CQE;
425 }
426
427 int ipoib_poll(struct napi_struct *napi, int budget)
428 {
429 struct ipoib_dev_priv *priv = container_of(napi, struct ipoib_dev_priv, napi);
430 struct net_device *dev = priv->dev;
431 int done;
432 int t;
433 int n, i;
434
435 done = 0;
436
437 poll_more:
438 while (done < budget) {
439 int max = (budget - done);
440
441 t = min(IPOIB_NUM_WC, max);
442 n = ib_poll_cq(priv->recv_cq, t, priv->ibwc);
443
444 for (i = 0; i < n; i++) {
445 struct ib_wc *wc = priv->ibwc + i;
446
447 if (wc->wr_id & IPOIB_OP_RECV) {
448 ++done;
449 if (wc->wr_id & IPOIB_OP_CM)
450 ipoib_cm_handle_rx_wc(dev, wc);
451 else
452 ipoib_ib_handle_rx_wc(dev, wc);
453 } else
454 ipoib_cm_handle_tx_wc(priv->dev, wc);
455 }
456
457 if (n != t)
458 break;
459 }
460
461 if (done < budget) {
462 napi_complete(napi);
463 if (unlikely(ib_req_notify_cq(priv->recv_cq,
464 IB_CQ_NEXT_COMP |
465 IB_CQ_REPORT_MISSED_EVENTS)) &&
466 napi_reschedule(napi))
467 goto poll_more;
468 }
469
470 return done;
471 }
472
473 void ipoib_ib_completion(struct ib_cq *cq, void *dev_ptr)
474 {
475 struct net_device *dev = dev_ptr;
476 struct ipoib_dev_priv *priv = netdev_priv(dev);
477
478 napi_schedule(&priv->napi);
479 }
480
481 static void drain_tx_cq(struct net_device *dev)
482 {
483 struct ipoib_dev_priv *priv = netdev_priv(dev);
484
485 netif_tx_lock(dev);
486 while (poll_tx(priv))
487 ; /* nothing */
488
489 if (netif_queue_stopped(dev))
490 mod_timer(&priv->poll_timer, jiffies + 1);
491
492 netif_tx_unlock(dev);
493 }
494
495 void ipoib_send_comp_handler(struct ib_cq *cq, void *dev_ptr)
496 {
497 struct ipoib_dev_priv *priv = netdev_priv(dev_ptr);
498
499 mod_timer(&priv->poll_timer, jiffies);
500 }
501
502 static inline int post_send(struct ipoib_dev_priv *priv,
503 unsigned int wr_id,
504 struct ib_ah *address, u32 qpn,
505 struct ipoib_tx_buf *tx_req,
506 void *head, int hlen)
507 {
508 struct ib_send_wr *bad_wr;
509 int i, off;
510 struct sk_buff *skb = tx_req->skb;
511 skb_frag_t *frags = skb_shinfo(skb)->frags;
512 int nr_frags = skb_shinfo(skb)->nr_frags;
513 u64 *mapping = tx_req->mapping;
514
515 if (skb_headlen(skb)) {
516 priv->tx_sge[0].addr = mapping[0];
517 priv->tx_sge[0].length = skb_headlen(skb);
518 off = 1;
519 } else
520 off = 0;
521
522 for (i = 0; i < nr_frags; ++i) {
523 priv->tx_sge[i + off].addr = mapping[i + off];
524 priv->tx_sge[i + off].length = skb_frag_size(&frags[i]);
525 }
526 priv->tx_wr.num_sge = nr_frags + off;
527 priv->tx_wr.wr_id = wr_id;
528 priv->tx_wr.wr.ud.remote_qpn = qpn;
529 priv->tx_wr.wr.ud.ah = address;
530
531 if (head) {
532 priv->tx_wr.wr.ud.mss = skb_shinfo(skb)->gso_size;
533 priv->tx_wr.wr.ud.header = head;
534 priv->tx_wr.wr.ud.hlen = hlen;
535 priv->tx_wr.opcode = IB_WR_LSO;
536 } else
537 priv->tx_wr.opcode = IB_WR_SEND;
538
539 return ib_post_send(priv->qp, &priv->tx_wr, &bad_wr);
540 }
541
542 void ipoib_send(struct net_device *dev, struct sk_buff *skb,
543 struct ipoib_ah *address, u32 qpn)
544 {
545 struct ipoib_dev_priv *priv = netdev_priv(dev);
546 struct ipoib_tx_buf *tx_req;
547 int hlen, rc;
548 void *phead;
549
550 if (skb_is_gso(skb)) {
551 hlen = skb_transport_offset(skb) + tcp_hdrlen(skb);
552 phead = skb->data;
553 if (unlikely(!skb_pull(skb, hlen))) {
554 ipoib_warn(priv, "linear data too small\n");
555 ++dev->stats.tx_dropped;
556 ++dev->stats.tx_errors;
557 dev_kfree_skb_any(skb);
558 return;
559 }
560 } else {
561 if (unlikely(skb->len > priv->mcast_mtu + IPOIB_ENCAP_LEN)) {
562 ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n",
563 skb->len, priv->mcast_mtu + IPOIB_ENCAP_LEN);
564 ++dev->stats.tx_dropped;
565 ++dev->stats.tx_errors;
566 ipoib_cm_skb_too_long(dev, skb, priv->mcast_mtu);
567 return;
568 }
569 phead = NULL;
570 hlen = 0;
571 }
572
573 ipoib_dbg_data(priv, "sending packet, length=%d address=%p qpn=0x%06x\n",
574 skb->len, address, qpn);
575
576 /*
577 * We put the skb into the tx_ring _before_ we call post_send()
578 * because it's entirely possible that the completion handler will
579 * run before we execute anything after the post_send(). That
580 * means we have to make sure everything is properly recorded and
581 * our state is consistent before we call post_send().
582 */
583 tx_req = &priv->tx_ring[priv->tx_head & (ipoib_sendq_size - 1)];
584 tx_req->skb = skb;
585 if (unlikely(ipoib_dma_map_tx(priv->ca, tx_req))) {
586 ++dev->stats.tx_errors;
587 dev_kfree_skb_any(skb);
588 return;
589 }
590
591 if (skb->ip_summed == CHECKSUM_PARTIAL)
592 priv->tx_wr.send_flags |= IB_SEND_IP_CSUM;
593 else
594 priv->tx_wr.send_flags &= ~IB_SEND_IP_CSUM;
595
596 if (++priv->tx_outstanding == ipoib_sendq_size) {
597 ipoib_dbg(priv, "TX ring full, stopping kernel net queue\n");
598 if (ib_req_notify_cq(priv->send_cq, IB_CQ_NEXT_COMP))
599 ipoib_warn(priv, "request notify on send CQ failed\n");
600 netif_stop_queue(dev);
601 }
602
603 skb_orphan(skb);
604 skb_dst_drop(skb);
605
606 rc = post_send(priv, priv->tx_head & (ipoib_sendq_size - 1),
607 address->ah, qpn, tx_req, phead, hlen);
608 if (unlikely(rc)) {
609 ipoib_warn(priv, "post_send failed, error %d\n", rc);
610 ++dev->stats.tx_errors;
611 --priv->tx_outstanding;
612 ipoib_dma_unmap_tx(priv->ca, tx_req);
613 dev_kfree_skb_any(skb);
614 if (netif_queue_stopped(dev))
615 netif_wake_queue(dev);
616 } else {
617 dev->trans_start = jiffies;
618
619 address->last_send = priv->tx_head;
620 ++priv->tx_head;
621 }
622
623 if (unlikely(priv->tx_outstanding > MAX_SEND_CQE))
624 while (poll_tx(priv))
625 ; /* nothing */
626 }
627
628 static void __ipoib_reap_ah(struct net_device *dev)
629 {
630 struct ipoib_dev_priv *priv = netdev_priv(dev);
631 struct ipoib_ah *ah, *tah;
632 LIST_HEAD(remove_list);
633 unsigned long flags;
634
635 netif_tx_lock_bh(dev);
636 spin_lock_irqsave(&priv->lock, flags);
637
638 list_for_each_entry_safe(ah, tah, &priv->dead_ahs, list)
639 if ((int) priv->tx_tail - (int) ah->last_send >= 0) {
640 list_del(&ah->list);
641 ib_destroy_ah(ah->ah);
642 kfree(ah);
643 }
644
645 spin_unlock_irqrestore(&priv->lock, flags);
646 netif_tx_unlock_bh(dev);
647 }
648
649 void ipoib_reap_ah(struct work_struct *work)
650 {
651 struct ipoib_dev_priv *priv =
652 container_of(work, struct ipoib_dev_priv, ah_reap_task.work);
653 struct net_device *dev = priv->dev;
654
655 __ipoib_reap_ah(dev);
656
657 if (!test_bit(IPOIB_STOP_REAPER, &priv->flags))
658 queue_delayed_work(ipoib_workqueue, &priv->ah_reap_task,
659 round_jiffies_relative(HZ));
660 }
661
662 static void ipoib_ib_tx_timer_func(unsigned long ctx)
663 {
664 drain_tx_cq((struct net_device *)ctx);
665 }
666
667 int ipoib_ib_dev_open(struct net_device *dev)
668 {
669 struct ipoib_dev_priv *priv = netdev_priv(dev);
670 int ret;
671
672 if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &priv->pkey_index)) {
673 ipoib_warn(priv, "P_Key 0x%04x not found\n", priv->pkey);
674 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
675 return -1;
676 }
677 set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
678
679 ret = ipoib_init_qp(dev);
680 if (ret) {
681 ipoib_warn(priv, "ipoib_init_qp returned %d\n", ret);
682 return -1;
683 }
684
685 ret = ipoib_ib_post_receives(dev);
686 if (ret) {
687 ipoib_warn(priv, "ipoib_ib_post_receives returned %d\n", ret);
688 ipoib_ib_dev_stop(dev, 1);
689 return -1;
690 }
691
692 ret = ipoib_cm_dev_open(dev);
693 if (ret) {
694 ipoib_warn(priv, "ipoib_cm_dev_open returned %d\n", ret);
695 ipoib_ib_dev_stop(dev, 1);
696 return -1;
697 }
698
699 clear_bit(IPOIB_STOP_REAPER, &priv->flags);
700 queue_delayed_work(ipoib_workqueue, &priv->ah_reap_task,
701 round_jiffies_relative(HZ));
702
703 if (!test_and_set_bit(IPOIB_FLAG_INITIALIZED, &priv->flags))
704 napi_enable(&priv->napi);
705
706 return 0;
707 }
708
709 static void ipoib_pkey_dev_check_presence(struct net_device *dev)
710 {
711 struct ipoib_dev_priv *priv = netdev_priv(dev);
712 u16 pkey_index = 0;
713
714 if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &pkey_index))
715 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
716 else
717 set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
718 }
719
720 int ipoib_ib_dev_up(struct net_device *dev)
721 {
722 struct ipoib_dev_priv *priv = netdev_priv(dev);
723
724 ipoib_pkey_dev_check_presence(dev);
725
726 if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
727 ipoib_dbg(priv, "PKEY is not assigned.\n");
728 return 0;
729 }
730
731 set_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
732
733 return ipoib_mcast_start_thread(dev);
734 }
735
736 int ipoib_ib_dev_down(struct net_device *dev, int flush)
737 {
738 struct ipoib_dev_priv *priv = netdev_priv(dev);
739
740 ipoib_dbg(priv, "downing ib_dev\n");
741
742 clear_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
743 netif_carrier_off(dev);
744
745 /* Shutdown the P_Key thread if still active */
746 if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
747 mutex_lock(&pkey_mutex);
748 set_bit(IPOIB_PKEY_STOP, &priv->flags);
749 cancel_delayed_work(&priv->pkey_poll_task);
750 mutex_unlock(&pkey_mutex);
751 if (flush)
752 flush_workqueue(ipoib_workqueue);
753 }
754
755 ipoib_mcast_stop_thread(dev, flush);
756 ipoib_mcast_dev_flush(dev);
757
758 ipoib_flush_paths(dev);
759
760 return 0;
761 }
762
763 static int recvs_pending(struct net_device *dev)
764 {
765 struct ipoib_dev_priv *priv = netdev_priv(dev);
766 int pending = 0;
767 int i;
768
769 for (i = 0; i < ipoib_recvq_size; ++i)
770 if (priv->rx_ring[i].skb)
771 ++pending;
772
773 return pending;
774 }
775
776 void ipoib_drain_cq(struct net_device *dev)
777 {
778 struct ipoib_dev_priv *priv = netdev_priv(dev);
779 int i, n;
780
781 /*
782 * We call completion handling routines that expect to be
783 * called from the BH-disabled NAPI poll context, so disable
784 * BHs here too.
785 */
786 local_bh_disable();
787
788 do {
789 n = ib_poll_cq(priv->recv_cq, IPOIB_NUM_WC, priv->ibwc);
790 for (i = 0; i < n; ++i) {
791 /*
792 * Convert any successful completions to flush
793 * errors to avoid passing packets up the
794 * stack after bringing the device down.
795 */
796 if (priv->ibwc[i].status == IB_WC_SUCCESS)
797 priv->ibwc[i].status = IB_WC_WR_FLUSH_ERR;
798
799 if (priv->ibwc[i].wr_id & IPOIB_OP_RECV) {
800 if (priv->ibwc[i].wr_id & IPOIB_OP_CM)
801 ipoib_cm_handle_rx_wc(dev, priv->ibwc + i);
802 else
803 ipoib_ib_handle_rx_wc(dev, priv->ibwc + i);
804 } else
805 ipoib_cm_handle_tx_wc(dev, priv->ibwc + i);
806 }
807 } while (n == IPOIB_NUM_WC);
808
809 while (poll_tx(priv))
810 ; /* nothing */
811
812 local_bh_enable();
813 }
814
815 int ipoib_ib_dev_stop(struct net_device *dev, int flush)
816 {
817 struct ipoib_dev_priv *priv = netdev_priv(dev);
818 struct ib_qp_attr qp_attr;
819 unsigned long begin;
820 struct ipoib_tx_buf *tx_req;
821 int i;
822
823 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &priv->flags))
824 napi_disable(&priv->napi);
825
826 ipoib_cm_dev_stop(dev);
827
828 /*
829 * Move our QP to the error state and then reinitialize in
830 * when all work requests have completed or have been flushed.
831 */
832 qp_attr.qp_state = IB_QPS_ERR;
833 if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
834 ipoib_warn(priv, "Failed to modify QP to ERROR state\n");
835
836 /* Wait for all sends and receives to complete */
837 begin = jiffies;
838
839 while (priv->tx_head != priv->tx_tail || recvs_pending(dev)) {
840 if (time_after(jiffies, begin + 5 * HZ)) {
841 ipoib_warn(priv, "timing out; %d sends %d receives not completed\n",
842 priv->tx_head - priv->tx_tail, recvs_pending(dev));
843
844 /*
845 * assume the HW is wedged and just free up
846 * all our pending work requests.
847 */
848 while ((int) priv->tx_tail - (int) priv->tx_head < 0) {
849 tx_req = &priv->tx_ring[priv->tx_tail &
850 (ipoib_sendq_size - 1)];
851 ipoib_dma_unmap_tx(priv->ca, tx_req);
852 dev_kfree_skb_any(tx_req->skb);
853 ++priv->tx_tail;
854 --priv->tx_outstanding;
855 }
856
857 for (i = 0; i < ipoib_recvq_size; ++i) {
858 struct ipoib_rx_buf *rx_req;
859
860 rx_req = &priv->rx_ring[i];
861 if (!rx_req->skb)
862 continue;
863 ipoib_ud_dma_unmap_rx(priv,
864 priv->rx_ring[i].mapping);
865 dev_kfree_skb_any(rx_req->skb);
866 rx_req->skb = NULL;
867 }
868
869 goto timeout;
870 }
871
872 ipoib_drain_cq(dev);
873
874 msleep(1);
875 }
876
877 ipoib_dbg(priv, "All sends and receives done.\n");
878
879 timeout:
880 del_timer_sync(&priv->poll_timer);
881 qp_attr.qp_state = IB_QPS_RESET;
882 if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
883 ipoib_warn(priv, "Failed to modify QP to RESET state\n");
884
885 /* Wait for all AHs to be reaped */
886 set_bit(IPOIB_STOP_REAPER, &priv->flags);
887 cancel_delayed_work(&priv->ah_reap_task);
888 if (flush)
889 flush_workqueue(ipoib_workqueue);
890
891 begin = jiffies;
892
893 while (!list_empty(&priv->dead_ahs)) {
894 __ipoib_reap_ah(dev);
895
896 if (time_after(jiffies, begin + HZ)) {
897 ipoib_warn(priv, "timing out; will leak address handles\n");
898 break;
899 }
900
901 msleep(1);
902 }
903
904 ib_req_notify_cq(priv->recv_cq, IB_CQ_NEXT_COMP);
905
906 return 0;
907 }
908
909 int ipoib_ib_dev_init(struct net_device *dev, struct ib_device *ca, int port)
910 {
911 struct ipoib_dev_priv *priv = netdev_priv(dev);
912
913 priv->ca = ca;
914 priv->port = port;
915 priv->qp = NULL;
916
917 if (ipoib_transport_dev_init(dev, ca)) {
918 printk(KERN_WARNING "%s: ipoib_transport_dev_init failed\n", ca->name);
919 return -ENODEV;
920 }
921
922 setup_timer(&priv->poll_timer, ipoib_ib_tx_timer_func,
923 (unsigned long) dev);
924
925 if (dev->flags & IFF_UP) {
926 if (ipoib_ib_dev_open(dev)) {
927 ipoib_transport_dev_cleanup(dev);
928 return -ENODEV;
929 }
930 }
931
932 return 0;
933 }
934
935 /*
936 * Takes whatever value which is in pkey index 0 and updates priv->pkey
937 * returns 0 if the pkey value was changed.
938 */
939 static inline int update_parent_pkey(struct ipoib_dev_priv *priv)
940 {
941 int result;
942 u16 prev_pkey;
943
944 prev_pkey = priv->pkey;
945 result = ib_query_pkey(priv->ca, priv->port, 0, &priv->pkey);
946 if (result) {
947 ipoib_warn(priv, "ib_query_pkey port %d failed (ret = %d)\n",
948 priv->port, result);
949 return result;
950 }
951
952 priv->pkey |= 0x8000;
953
954 if (prev_pkey != priv->pkey) {
955 ipoib_dbg(priv, "pkey changed from 0x%x to 0x%x\n",
956 prev_pkey, priv->pkey);
957 /*
958 * Update the pkey in the broadcast address, while making sure to set
959 * the full membership bit, so that we join the right broadcast group.
960 */
961 priv->dev->broadcast[8] = priv->pkey >> 8;
962 priv->dev->broadcast[9] = priv->pkey & 0xff;
963 return 0;
964 }
965
966 return 1;
967 }
968
969 static void __ipoib_ib_dev_flush(struct ipoib_dev_priv *priv,
970 enum ipoib_flush_level level)
971 {
972 struct ipoib_dev_priv *cpriv;
973 struct net_device *dev = priv->dev;
974 u16 new_index;
975 int result;
976
977 mutex_lock(&priv->vlan_mutex);
978
979 /*
980 * Flush any child interfaces too -- they might be up even if
981 * the parent is down.
982 */
983 list_for_each_entry(cpriv, &priv->child_intfs, list)
984 __ipoib_ib_dev_flush(cpriv, level);
985
986 mutex_unlock(&priv->vlan_mutex);
987
988 if (!test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags)) {
989 /* for non-child devices must check/update the pkey value here */
990 if (level == IPOIB_FLUSH_HEAVY &&
991 !test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags))
992 update_parent_pkey(priv);
993 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_INITIALIZED not set.\n");
994 return;
995 }
996
997 if (!test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) {
998 ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_ADMIN_UP not set.\n");
999 return;
1000 }
1001
1002 if (level == IPOIB_FLUSH_HEAVY) {
1003 /* child devices chase their origin pkey value, while non-child
1004 * (parent) devices should always takes what present in pkey index 0
1005 */
1006 if (test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
1007 if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &new_index)) {
1008 clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
1009 ipoib_ib_dev_down(dev, 0);
1010 ipoib_ib_dev_stop(dev, 0);
1011 if (ipoib_pkey_dev_delay_open(dev))
1012 return;
1013 }
1014 /* restart QP only if P_Key index is changed */
1015 if (test_and_set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags) &&
1016 new_index == priv->pkey_index) {
1017 ipoib_dbg(priv, "Not flushing - P_Key index not changed.\n");
1018 return;
1019 }
1020 priv->pkey_index = new_index;
1021 } else {
1022 result = update_parent_pkey(priv);
1023 /* restart QP only if P_Key value changed */
1024 if (result) {
1025 ipoib_dbg(priv, "Not flushing - P_Key value not changed.\n");
1026 return;
1027 }
1028 }
1029 }
1030
1031 if (level == IPOIB_FLUSH_LIGHT) {
1032 ipoib_mark_paths_invalid(dev);
1033 ipoib_mcast_dev_flush(dev);
1034 }
1035
1036 if (level >= IPOIB_FLUSH_NORMAL)
1037 ipoib_ib_dev_down(dev, 0);
1038
1039 if (level == IPOIB_FLUSH_HEAVY) {
1040 ipoib_ib_dev_stop(dev, 0);
1041 ipoib_ib_dev_open(dev);
1042 }
1043
1044 /*
1045 * The device could have been brought down between the start and when
1046 * we get here, don't bring it back up if it's not configured up
1047 */
1048 if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) {
1049 if (level >= IPOIB_FLUSH_NORMAL)
1050 ipoib_ib_dev_up(dev);
1051 ipoib_mcast_restart_task(&priv->restart_task);
1052 }
1053 }
1054
1055 void ipoib_ib_dev_flush_light(struct work_struct *work)
1056 {
1057 struct ipoib_dev_priv *priv =
1058 container_of(work, struct ipoib_dev_priv, flush_light);
1059
1060 __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_LIGHT);
1061 }
1062
1063 void ipoib_ib_dev_flush_normal(struct work_struct *work)
1064 {
1065 struct ipoib_dev_priv *priv =
1066 container_of(work, struct ipoib_dev_priv, flush_normal);
1067
1068 __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_NORMAL);
1069 }
1070
1071 void ipoib_ib_dev_flush_heavy(struct work_struct *work)
1072 {
1073 struct ipoib_dev_priv *priv =
1074 container_of(work, struct ipoib_dev_priv, flush_heavy);
1075
1076 __ipoib_ib_dev_flush(priv, IPOIB_FLUSH_HEAVY);
1077 }
1078
1079 void ipoib_ib_dev_cleanup(struct net_device *dev)
1080 {
1081 struct ipoib_dev_priv *priv = netdev_priv(dev);
1082
1083 ipoib_dbg(priv, "cleaning up ib_dev\n");
1084
1085 ipoib_mcast_stop_thread(dev, 1);
1086 ipoib_mcast_dev_flush(dev);
1087
1088 ipoib_transport_dev_cleanup(dev);
1089 }
1090
1091 /*
1092 * Delayed P_Key Assigment Interim Support
1093 *
1094 * The following is initial implementation of delayed P_Key assigment
1095 * mechanism. It is using the same approach implemented for the multicast
1096 * group join. The single goal of this implementation is to quickly address
1097 * Bug #2507. This implementation will probably be removed when the P_Key
1098 * change async notification is available.
1099 */
1100
1101 void ipoib_pkey_poll(struct work_struct *work)
1102 {
1103 struct ipoib_dev_priv *priv =
1104 container_of(work, struct ipoib_dev_priv, pkey_poll_task.work);
1105 struct net_device *dev = priv->dev;
1106
1107 ipoib_pkey_dev_check_presence(dev);
1108
1109 if (test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags))
1110 ipoib_open(dev);
1111 else {
1112 mutex_lock(&pkey_mutex);
1113 if (!test_bit(IPOIB_PKEY_STOP, &priv->flags))
1114 queue_delayed_work(ipoib_workqueue,
1115 &priv->pkey_poll_task,
1116 HZ);
1117 mutex_unlock(&pkey_mutex);
1118 }
1119 }
1120
1121 int ipoib_pkey_dev_delay_open(struct net_device *dev)
1122 {
1123 struct ipoib_dev_priv *priv = netdev_priv(dev);
1124
1125 /* Look for the interface pkey value in the IB Port P_Key table and */
1126 /* set the interface pkey assigment flag */
1127 ipoib_pkey_dev_check_presence(dev);
1128
1129 /* P_Key value not assigned yet - start polling */
1130 if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
1131 mutex_lock(&pkey_mutex);
1132 clear_bit(IPOIB_PKEY_STOP, &priv->flags);
1133 queue_delayed_work(ipoib_workqueue,
1134 &priv->pkey_poll_task,
1135 HZ);
1136 mutex_unlock(&pkey_mutex);
1137 return 1;
1138 }
1139
1140 return 0;
1141 }
Linux kernel - Deliverables
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