projects / deliverable / linux.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Merge remote-tracking branch 'ftrace/for-next'
[deliverable/linux.git] / drivers / infiniband / ulp / ipoib / ipoib_cm.c
1 /*
2 * Copyright (c) 2006 Mellanox Technologies. All rights reserved
3 *
4 * This software is available to you under a choice of one of two
5 * licenses. You may choose to be licensed under the terms of the GNU
6 * General Public License (GPL) Version 2, available from the file
7 * COPYING in the main directory of this source tree, or the
8 * OpenIB.org BSD license below:
9 *
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
12 * conditions are met:
13 *
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
16 * disclaimer.
17 *
18 * - Redistributions in binary form must reproduce the above
19 * copyright notice, this list of conditions and the following
20 * disclaimer in the documentation and/or other materials
21 * provided with the distribution.
22 *
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30 * SOFTWARE.
31 */
32
33 #include <rdma/ib_cm.h>
34 #include <net/dst.h>
35 #include <net/icmp.h>
36 #include <linux/icmpv6.h>
37 #include <linux/delay.h>
38 #include <linux/slab.h>
39 #include <linux/vmalloc.h>
40 #include <linux/moduleparam.h>
41
42 #include "ipoib.h"
43
44 int ipoib_max_conn_qp = 128;
45
46 module_param_named(max_nonsrq_conn_qp, ipoib_max_conn_qp, int, 0444);
47 MODULE_PARM_DESC(max_nonsrq_conn_qp,
48 "Max number of connected-mode QPs per interface "
49 "(applied only if shared receive queue is not available)");
50
51 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG_DATA
52 static int data_debug_level;
53
54 module_param_named(cm_data_debug_level, data_debug_level, int, 0644);
55 MODULE_PARM_DESC(cm_data_debug_level,
56 "Enable data path debug tracing for connected mode if > 0");
57 #endif
58
59 #define IPOIB_CM_IETF_ID 0x1000000000000000ULL
60
61 #define IPOIB_CM_RX_UPDATE_TIME (256 * HZ)
62 #define IPOIB_CM_RX_TIMEOUT (2 * 256 * HZ)
63 #define IPOIB_CM_RX_DELAY (3 * 256 * HZ)
64 #define IPOIB_CM_RX_UPDATE_MASK (0x3)
65
66 static struct ib_qp_attr ipoib_cm_err_attr = {
67 .qp_state = IB_QPS_ERR
68 };
69
70 #define IPOIB_CM_RX_DRAIN_WRID 0xffffffff
71
72 static struct ib_send_wr ipoib_cm_rx_drain_wr = {
73 .opcode = IB_WR_SEND,
74 };
75
76 static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id,
77 struct ib_cm_event *event);
78
79 static void ipoib_cm_dma_unmap_rx(struct ipoib_dev_priv *priv, int frags,
80 u64 mapping[IPOIB_CM_RX_SG])
81 {
82 int i;
83
84 ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_CM_HEAD_SIZE, DMA_FROM_DEVICE);
85
86 for (i = 0; i < frags; ++i)
87 ib_dma_unmap_page(priv->ca, mapping[i + 1], PAGE_SIZE, DMA_FROM_DEVICE);
88 }
89
90 static int ipoib_cm_post_receive_srq(struct net_device *dev, int id)
91 {
92 struct ipoib_dev_priv *priv = netdev_priv(dev);
93 struct ib_recv_wr *bad_wr;
94 int i, ret;
95
96 priv->cm.rx_wr.wr_id = id | IPOIB_OP_CM | IPOIB_OP_RECV;
97
98 for (i = 0; i < priv->cm.num_frags; ++i)
99 priv->cm.rx_sge[i].addr = priv->cm.srq_ring[id].mapping[i];
100
101 ret = ib_post_srq_recv(priv->cm.srq, &priv->cm.rx_wr, &bad_wr);
102 if (unlikely(ret)) {
103 ipoib_warn(priv, "post srq failed for buf %d (%d)\n", id, ret);
104 ipoib_cm_dma_unmap_rx(priv, priv->cm.num_frags - 1,
105 priv->cm.srq_ring[id].mapping);
106 dev_kfree_skb_any(priv->cm.srq_ring[id].skb);
107 priv->cm.srq_ring[id].skb = NULL;
108 }
109
110 return ret;
111 }
112
113 static int ipoib_cm_post_receive_nonsrq(struct net_device *dev,
114 struct ipoib_cm_rx *rx,
115 struct ib_recv_wr *wr,
116 struct ib_sge *sge, int id)
117 {
118 struct ipoib_dev_priv *priv = netdev_priv(dev);
119 struct ib_recv_wr *bad_wr;
120 int i, ret;
121
122 wr->wr_id = id | IPOIB_OP_CM | IPOIB_OP_RECV;
123
124 for (i = 0; i < IPOIB_CM_RX_SG; ++i)
125 sge[i].addr = rx->rx_ring[id].mapping[i];
126
127 ret = ib_post_recv(rx->qp, wr, &bad_wr);
128 if (unlikely(ret)) {
129 ipoib_warn(priv, "post recv failed for buf %d (%d)\n", id, ret);
130 ipoib_cm_dma_unmap_rx(priv, IPOIB_CM_RX_SG - 1,
131 rx->rx_ring[id].mapping);
132 dev_kfree_skb_any(rx->rx_ring[id].skb);
133 rx->rx_ring[id].skb = NULL;
134 }
135
136 return ret;
137 }
138
139 static struct sk_buff *ipoib_cm_alloc_rx_skb(struct net_device *dev,
140 struct ipoib_cm_rx_buf *rx_ring,
141 int id, int frags,
142 u64 mapping[IPOIB_CM_RX_SG],
143 gfp_t gfp)
144 {
145 struct ipoib_dev_priv *priv = netdev_priv(dev);
146 struct sk_buff *skb;
147 int i;
148
149 skb = dev_alloc_skb(IPOIB_CM_HEAD_SIZE + 12);
150 if (unlikely(!skb))
151 return NULL;
152
153 /*
154 * IPoIB adds a 4 byte header. So we need 12 more bytes to align the
155 * IP header to a multiple of 16.
156 */
157 skb_reserve(skb, 12);
158
159 mapping[0] = ib_dma_map_single(priv->ca, skb->data, IPOIB_CM_HEAD_SIZE,
160 DMA_FROM_DEVICE);
161 if (unlikely(ib_dma_mapping_error(priv->ca, mapping[0]))) {
162 dev_kfree_skb_any(skb);
163 return NULL;
164 }
165
166 for (i = 0; i < frags; i++) {
167 struct page *page = alloc_page(gfp);
168
169 if (!page)
170 goto partial_error;
171 skb_fill_page_desc(skb, i, page, 0, PAGE_SIZE);
172
173 mapping[i + 1] = ib_dma_map_page(priv->ca, page,
174 0, PAGE_SIZE, DMA_FROM_DEVICE);
175 if (unlikely(ib_dma_mapping_error(priv->ca, mapping[i + 1])))
176 goto partial_error;
177 }
178
179 rx_ring[id].skb = skb;
180 return skb;
181
182 partial_error:
183
184 ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_CM_HEAD_SIZE, DMA_FROM_DEVICE);
185
186 for (; i > 0; --i)
187 ib_dma_unmap_page(priv->ca, mapping[i], PAGE_SIZE, DMA_FROM_DEVICE);
188
189 dev_kfree_skb_any(skb);
190 return NULL;
191 }
192
193 static void ipoib_cm_free_rx_ring(struct net_device *dev,
194 struct ipoib_cm_rx_buf *rx_ring)
195 {
196 struct ipoib_dev_priv *priv = netdev_priv(dev);
197 int i;
198
199 for (i = 0; i < ipoib_recvq_size; ++i)
200 if (rx_ring[i].skb) {
201 ipoib_cm_dma_unmap_rx(priv, IPOIB_CM_RX_SG - 1,
202 rx_ring[i].mapping);
203 dev_kfree_skb_any(rx_ring[i].skb);
204 }
205
206 vfree(rx_ring);
207 }
208
209 static void ipoib_cm_start_rx_drain(struct ipoib_dev_priv *priv)
210 {
211 struct ib_send_wr *bad_wr;
212 struct ipoib_cm_rx *p;
213
214 /* We only reserved 1 extra slot in CQ for drain WRs, so
215 * make sure we have at most 1 outstanding WR. */
216 if (list_empty(&priv->cm.rx_flush_list) ||
217 !list_empty(&priv->cm.rx_drain_list))
218 return;
219
220 /*
221 * QPs on flush list are error state. This way, a "flush
222 * error" WC will be immediately generated for each WR we post.
223 */
224 p = list_entry(priv->cm.rx_flush_list.next, typeof(*p), list);
225 ipoib_cm_rx_drain_wr.wr_id = IPOIB_CM_RX_DRAIN_WRID;
226 if (ib_post_send(p->qp, &ipoib_cm_rx_drain_wr, &bad_wr))
227 ipoib_warn(priv, "failed to post drain wr\n");
228
229 list_splice_init(&priv->cm.rx_flush_list, &priv->cm.rx_drain_list);
230 }
231
232 static void ipoib_cm_rx_event_handler(struct ib_event *event, void *ctx)
233 {
234 struct ipoib_cm_rx *p = ctx;
235 struct ipoib_dev_priv *priv = netdev_priv(p->dev);
236 unsigned long flags;
237
238 if (event->event != IB_EVENT_QP_LAST_WQE_REACHED)
239 return;
240
241 spin_lock_irqsave(&priv->lock, flags);
242 list_move(&p->list, &priv->cm.rx_flush_list);
243 p->state = IPOIB_CM_RX_FLUSH;
244 ipoib_cm_start_rx_drain(priv);
245 spin_unlock_irqrestore(&priv->lock, flags);
246 }
247
248 static struct ib_qp *ipoib_cm_create_rx_qp(struct net_device *dev,
249 struct ipoib_cm_rx *p)
250 {
251 struct ipoib_dev_priv *priv = netdev_priv(dev);
252 struct ib_qp_init_attr attr = {
253 .event_handler = ipoib_cm_rx_event_handler,
254 .send_cq = priv->recv_cq, /* For drain WR */
255 .recv_cq = priv->recv_cq,
256 .srq = priv->cm.srq,
257 .cap.max_send_wr = 1, /* For drain WR */
258 .cap.max_send_sge = 1, /* FIXME: 0 Seems not to work */
259 .sq_sig_type = IB_SIGNAL_ALL_WR,
260 .qp_type = IB_QPT_RC,
261 .qp_context = p,
262 };
263
264 if (!ipoib_cm_has_srq(dev)) {
265 attr.cap.max_recv_wr = ipoib_recvq_size;
266 attr.cap.max_recv_sge = IPOIB_CM_RX_SG;
267 }
268
269 return ib_create_qp(priv->pd, &attr);
270 }
271
272 static int ipoib_cm_modify_rx_qp(struct net_device *dev,
273 struct ib_cm_id *cm_id, struct ib_qp *qp,
274 unsigned psn)
275 {
276 struct ipoib_dev_priv *priv = netdev_priv(dev);
277 struct ib_qp_attr qp_attr;
278 int qp_attr_mask, ret;
279
280 qp_attr.qp_state = IB_QPS_INIT;
281 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
282 if (ret) {
283 ipoib_warn(priv, "failed to init QP attr for INIT: %d\n", ret);
284 return ret;
285 }
286 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
287 if (ret) {
288 ipoib_warn(priv, "failed to modify QP to INIT: %d\n", ret);
289 return ret;
290 }
291 qp_attr.qp_state = IB_QPS_RTR;
292 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
293 if (ret) {
294 ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret);
295 return ret;
296 }
297 qp_attr.rq_psn = psn;
298 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
299 if (ret) {
300 ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret);
301 return ret;
302 }
303
304 /*
305 * Current Mellanox HCA firmware won't generate completions
306 * with error for drain WRs unless the QP has been moved to
307 * RTS first. This work-around leaves a window where a QP has
308 * moved to error asynchronously, but this will eventually get
309 * fixed in firmware, so let's not error out if modify QP
310 * fails.
311 */
312 qp_attr.qp_state = IB_QPS_RTS;
313 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
314 if (ret) {
315 ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret);
316 return 0;
317 }
318 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
319 if (ret) {
320 ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret);
321 return 0;
322 }
323
324 return 0;
325 }
326
327 static void ipoib_cm_init_rx_wr(struct net_device *dev,
328 struct ib_recv_wr *wr,
329 struct ib_sge *sge)
330 {
331 struct ipoib_dev_priv *priv = netdev_priv(dev);
332 int i;
333
334 for (i = 0; i < priv->cm.num_frags; ++i)
335 sge[i].lkey = priv->pd->local_dma_lkey;
336
337 sge[0].length = IPOIB_CM_HEAD_SIZE;
338 for (i = 1; i < priv->cm.num_frags; ++i)
339 sge[i].length = PAGE_SIZE;
340
341 wr->next = NULL;
342 wr->sg_list = sge;
343 wr->num_sge = priv->cm.num_frags;
344 }
345
346 static int ipoib_cm_nonsrq_init_rx(struct net_device *dev, struct ib_cm_id *cm_id,
347 struct ipoib_cm_rx *rx)
348 {
349 struct ipoib_dev_priv *priv = netdev_priv(dev);
350 struct {
351 struct ib_recv_wr wr;
352 struct ib_sge sge[IPOIB_CM_RX_SG];
353 } *t;
354 int ret;
355 int i;
356
357 rx->rx_ring = vzalloc(ipoib_recvq_size * sizeof *rx->rx_ring);
358 if (!rx->rx_ring) {
359 printk(KERN_WARNING "%s: failed to allocate CM non-SRQ ring (%d entries)\n",
360 priv->ca->name, ipoib_recvq_size);
361 return -ENOMEM;
362 }
363
364 t = kmalloc(sizeof *t, GFP_KERNEL);
365 if (!t) {
366 ret = -ENOMEM;
367 goto err_free;
368 }
369
370 ipoib_cm_init_rx_wr(dev, &t->wr, t->sge);
371
372 spin_lock_irq(&priv->lock);
373
374 if (priv->cm.nonsrq_conn_qp >= ipoib_max_conn_qp) {
375 spin_unlock_irq(&priv->lock);
376 ib_send_cm_rej(cm_id, IB_CM_REJ_NO_QP, NULL, 0, NULL, 0);
377 ret = -EINVAL;
378 goto err_free;
379 } else
380 ++priv->cm.nonsrq_conn_qp;
381
382 spin_unlock_irq(&priv->lock);
383
384 for (i = 0; i < ipoib_recvq_size; ++i) {
385 if (!ipoib_cm_alloc_rx_skb(dev, rx->rx_ring, i, IPOIB_CM_RX_SG - 1,
386 rx->rx_ring[i].mapping,
387 GFP_KERNEL)) {
388 ipoib_warn(priv, "failed to allocate receive buffer %d\n", i);
389 ret = -ENOMEM;
390 goto err_count;
391 }
392 ret = ipoib_cm_post_receive_nonsrq(dev, rx, &t->wr, t->sge, i);
393 if (ret) {
394 ipoib_warn(priv, "ipoib_cm_post_receive_nonsrq "
395 "failed for buf %d\n", i);
396 ret = -EIO;
397 goto err_count;
398 }
399 }
400
401 rx->recv_count = ipoib_recvq_size;
402
403 kfree(t);
404
405 return 0;
406
407 err_count:
408 spin_lock_irq(&priv->lock);
409 --priv->cm.nonsrq_conn_qp;
410 spin_unlock_irq(&priv->lock);
411
412 err_free:
413 kfree(t);
414 ipoib_cm_free_rx_ring(dev, rx->rx_ring);
415
416 return ret;
417 }
418
419 static int ipoib_cm_send_rep(struct net_device *dev, struct ib_cm_id *cm_id,
420 struct ib_qp *qp, struct ib_cm_req_event_param *req,
421 unsigned psn)
422 {
423 struct ipoib_dev_priv *priv = netdev_priv(dev);
424 struct ipoib_cm_data data = {};
425 struct ib_cm_rep_param rep = {};
426
427 data.qpn = cpu_to_be32(priv->qp->qp_num);
428 data.mtu = cpu_to_be32(IPOIB_CM_BUF_SIZE);
429
430 rep.private_data = &data;
431 rep.private_data_len = sizeof data;
432 rep.flow_control = 0;
433 rep.rnr_retry_count = req->rnr_retry_count;
434 rep.srq = ipoib_cm_has_srq(dev);
435 rep.qp_num = qp->qp_num;
436 rep.starting_psn = psn;
437 return ib_send_cm_rep(cm_id, &rep);
438 }
439
440 static int ipoib_cm_req_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
441 {
442 struct net_device *dev = cm_id->context;
443 struct ipoib_dev_priv *priv = netdev_priv(dev);
444 struct ipoib_cm_rx *p;
445 unsigned psn;
446 int ret;
447
448 ipoib_dbg(priv, "REQ arrived\n");
449 p = kzalloc(sizeof *p, GFP_KERNEL);
450 if (!p)
451 return -ENOMEM;
452 p->dev = dev;
453 p->id = cm_id;
454 cm_id->context = p;
455 p->state = IPOIB_CM_RX_LIVE;
456 p->jiffies = jiffies;
457 INIT_LIST_HEAD(&p->list);
458
459 p->qp = ipoib_cm_create_rx_qp(dev, p);
460 if (IS_ERR(p->qp)) {
461 ret = PTR_ERR(p->qp);
462 goto err_qp;
463 }
464
465 psn = prandom_u32() & 0xffffff;
466 ret = ipoib_cm_modify_rx_qp(dev, cm_id, p->qp, psn);
467 if (ret)
468 goto err_modify;
469
470 if (!ipoib_cm_has_srq(dev)) {
471 ret = ipoib_cm_nonsrq_init_rx(dev, cm_id, p);
472 if (ret)
473 goto err_modify;
474 }
475
476 spin_lock_irq(&priv->lock);
477 queue_delayed_work(priv->wq,
478 &priv->cm.stale_task, IPOIB_CM_RX_DELAY);
479 /* Add this entry to passive ids list head, but do not re-add it
480 * if IB_EVENT_QP_LAST_WQE_REACHED has moved it to flush list. */
481 p->jiffies = jiffies;
482 if (p->state == IPOIB_CM_RX_LIVE)
483 list_move(&p->list, &priv->cm.passive_ids);
484 spin_unlock_irq(&priv->lock);
485
486 ret = ipoib_cm_send_rep(dev, cm_id, p->qp, &event->param.req_rcvd, psn);
487 if (ret) {
488 ipoib_warn(priv, "failed to send REP: %d\n", ret);
489 if (ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE))
490 ipoib_warn(priv, "unable to move qp to error state\n");
491 }
492 return 0;
493
494 err_modify:
495 ib_destroy_qp(p->qp);
496 err_qp:
497 kfree(p);
498 return ret;
499 }
500
501 static int ipoib_cm_rx_handler(struct ib_cm_id *cm_id,
502 struct ib_cm_event *event)
503 {
504 struct ipoib_cm_rx *p;
505 struct ipoib_dev_priv *priv;
506
507 switch (event->event) {
508 case IB_CM_REQ_RECEIVED:
509 return ipoib_cm_req_handler(cm_id, event);
510 case IB_CM_DREQ_RECEIVED:
511 p = cm_id->context;
512 ib_send_cm_drep(cm_id, NULL, 0);
513 /* Fall through */
514 case IB_CM_REJ_RECEIVED:
515 p = cm_id->context;
516 priv = netdev_priv(p->dev);
517 if (ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE))
518 ipoib_warn(priv, "unable to move qp to error state\n");
519 /* Fall through */
520 default:
521 return 0;
522 }
523 }
524 /* Adjust length of skb with fragments to match received data */
525 static void skb_put_frags(struct sk_buff *skb, unsigned int hdr_space,
526 unsigned int length, struct sk_buff *toskb)
527 {
528 int i, num_frags;
529 unsigned int size;
530
531 /* put header into skb */
532 size = min(length, hdr_space);
533 skb->tail += size;
534 skb->len += size;
535 length -= size;
536
537 num_frags = skb_shinfo(skb)->nr_frags;
538 for (i = 0; i < num_frags; i++) {
539 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
540
541 if (length == 0) {
542 /* don't need this page */
543 skb_fill_page_desc(toskb, i, skb_frag_page(frag),
544 0, PAGE_SIZE);
545 --skb_shinfo(skb)->nr_frags;
546 } else {
547 size = min(length, (unsigned) PAGE_SIZE);
548
549 skb_frag_size_set(frag, size);
550 skb->data_len += size;
551 skb->truesize += size;
552 skb->len += size;
553 length -= size;
554 }
555 }
556 }
557
558 void ipoib_cm_handle_rx_wc(struct net_device *dev, struct ib_wc *wc)
559 {
560 struct ipoib_dev_priv *priv = netdev_priv(dev);
561 struct ipoib_cm_rx_buf *rx_ring;
562 unsigned int wr_id = wc->wr_id & ~(IPOIB_OP_CM | IPOIB_OP_RECV);
563 struct sk_buff *skb, *newskb;
564 struct ipoib_cm_rx *p;
565 unsigned long flags;
566 u64 mapping[IPOIB_CM_RX_SG];
567 int frags;
568 int has_srq;
569 struct sk_buff *small_skb;
570
571 ipoib_dbg_data(priv, "cm recv completion: id %d, status: %d\n",
572 wr_id, wc->status);
573
574 if (unlikely(wr_id >= ipoib_recvq_size)) {
575 if (wr_id == (IPOIB_CM_RX_DRAIN_WRID & ~(IPOIB_OP_CM | IPOIB_OP_RECV))) {
576 spin_lock_irqsave(&priv->lock, flags);
577 list_splice_init(&priv->cm.rx_drain_list, &priv->cm.rx_reap_list);
578 ipoib_cm_start_rx_drain(priv);
579 queue_work(priv->wq, &priv->cm.rx_reap_task);
580 spin_unlock_irqrestore(&priv->lock, flags);
581 } else
582 ipoib_warn(priv, "cm recv completion event with wrid %d (> %d)\n",
583 wr_id, ipoib_recvq_size);
584 return;
585 }
586
587 p = wc->qp->qp_context;
588
589 has_srq = ipoib_cm_has_srq(dev);
590 rx_ring = has_srq ? priv->cm.srq_ring : p->rx_ring;
591
592 skb = rx_ring[wr_id].skb;
593
594 if (unlikely(wc->status != IB_WC_SUCCESS)) {
595 ipoib_dbg(priv, "cm recv error "
596 "(status=%d, wrid=%d vend_err %x)\n",
597 wc->status, wr_id, wc->vendor_err);
598 ++dev->stats.rx_dropped;
599 if (has_srq)
600 goto repost;
601 else {
602 if (!--p->recv_count) {
603 spin_lock_irqsave(&priv->lock, flags);
604 list_move(&p->list, &priv->cm.rx_reap_list);
605 spin_unlock_irqrestore(&priv->lock, flags);
606 queue_work(priv->wq, &priv->cm.rx_reap_task);
607 }
608 return;
609 }
610 }
611
612 if (unlikely(!(wr_id & IPOIB_CM_RX_UPDATE_MASK))) {
613 if (p && time_after_eq(jiffies, p->jiffies + IPOIB_CM_RX_UPDATE_TIME)) {
614 spin_lock_irqsave(&priv->lock, flags);
615 p->jiffies = jiffies;
616 /* Move this entry to list head, but do not re-add it
617 * if it has been moved out of list. */
618 if (p->state == IPOIB_CM_RX_LIVE)
619 list_move(&p->list, &priv->cm.passive_ids);
620 spin_unlock_irqrestore(&priv->lock, flags);
621 }
622 }
623
624 if (wc->byte_len < IPOIB_CM_COPYBREAK) {
625 int dlen = wc->byte_len;
626
627 small_skb = dev_alloc_skb(dlen + 12);
628 if (small_skb) {
629 skb_reserve(small_skb, 12);
630 ib_dma_sync_single_for_cpu(priv->ca, rx_ring[wr_id].mapping[0],
631 dlen, DMA_FROM_DEVICE);
632 skb_copy_from_linear_data(skb, small_skb->data, dlen);
633 ib_dma_sync_single_for_device(priv->ca, rx_ring[wr_id].mapping[0],
634 dlen, DMA_FROM_DEVICE);
635 skb_put(small_skb, dlen);
636 skb = small_skb;
637 goto copied;
638 }
639 }
640
641 frags = PAGE_ALIGN(wc->byte_len - min(wc->byte_len,
642 (unsigned)IPOIB_CM_HEAD_SIZE)) / PAGE_SIZE;
643
644 newskb = ipoib_cm_alloc_rx_skb(dev, rx_ring, wr_id, frags,
645 mapping, GFP_ATOMIC);
646 if (unlikely(!newskb)) {
647 /*
648 * If we can't allocate a new RX buffer, dump
649 * this packet and reuse the old buffer.
650 */
651 ipoib_dbg(priv, "failed to allocate receive buffer %d\n", wr_id);
652 ++dev->stats.rx_dropped;
653 goto repost;
654 }
655
656 ipoib_cm_dma_unmap_rx(priv, frags, rx_ring[wr_id].mapping);
657 memcpy(rx_ring[wr_id].mapping, mapping, (frags + 1) * sizeof *mapping);
658
659 ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n",
660 wc->byte_len, wc->slid);
661
662 skb_put_frags(skb, IPOIB_CM_HEAD_SIZE, wc->byte_len, newskb);
663
664 copied:
665 skb->protocol = ((struct ipoib_header *) skb->data)->proto;
666 skb_reset_mac_header(skb);
667 skb_pull(skb, IPOIB_ENCAP_LEN);
668
669 ++dev->stats.rx_packets;
670 dev->stats.rx_bytes += skb->len;
671
672 skb->dev = dev;
673 /* XXX get correct PACKET_ type here */
674 skb->pkt_type = PACKET_HOST;
675 netif_receive_skb(skb);
676
677 repost:
678 if (has_srq) {
679 if (unlikely(ipoib_cm_post_receive_srq(dev, wr_id)))
680 ipoib_warn(priv, "ipoib_cm_post_receive_srq failed "
681 "for buf %d\n", wr_id);
682 } else {
683 if (unlikely(ipoib_cm_post_receive_nonsrq(dev, p,
684 &priv->cm.rx_wr,
685 priv->cm.rx_sge,
686 wr_id))) {
687 --p->recv_count;
688 ipoib_warn(priv, "ipoib_cm_post_receive_nonsrq failed "
689 "for buf %d\n", wr_id);
690 }
691 }
692 }
693
694 static inline int post_send(struct ipoib_dev_priv *priv,
695 struct ipoib_cm_tx *tx,
696 unsigned int wr_id,
697 struct ipoib_tx_buf *tx_req)
698 {
699 struct ib_send_wr *bad_wr;
700
701 ipoib_build_sge(priv, tx_req);
702
703 priv->tx_wr.wr.wr_id = wr_id | IPOIB_OP_CM;
704
705 return ib_post_send(tx->qp, &priv->tx_wr.wr, &bad_wr);
706 }
707
708 void ipoib_cm_send(struct net_device *dev, struct sk_buff *skb, struct ipoib_cm_tx *tx)
709 {
710 struct ipoib_dev_priv *priv = netdev_priv(dev);
711 struct ipoib_tx_buf *tx_req;
712 int rc;
713 unsigned usable_sge = tx->max_send_sge - !!skb_headlen(skb);
714
715 if (unlikely(skb->len > tx->mtu)) {
716 ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n",
717 skb->len, tx->mtu);
718 ++dev->stats.tx_dropped;
719 ++dev->stats.tx_errors;
720 ipoib_cm_skb_too_long(dev, skb, tx->mtu - IPOIB_ENCAP_LEN);
721 return;
722 }
723 if (skb_shinfo(skb)->nr_frags > usable_sge) {
724 if (skb_linearize(skb) < 0) {
725 ipoib_warn(priv, "skb could not be linearized\n");
726 ++dev->stats.tx_dropped;
727 ++dev->stats.tx_errors;
728 dev_kfree_skb_any(skb);
729 return;
730 }
731 /* Does skb_linearize return ok without reducing nr_frags? */
732 if (skb_shinfo(skb)->nr_frags > usable_sge) {
733 ipoib_warn(priv, "too many frags after skb linearize\n");
734 ++dev->stats.tx_dropped;
735 ++dev->stats.tx_errors;
736 dev_kfree_skb_any(skb);
737 return;
738 }
739 }
740 ipoib_dbg_data(priv, "sending packet: head 0x%x length %d connection 0x%x\n",
741 tx->tx_head, skb->len, tx->qp->qp_num);
742
743 /*
744 * We put the skb into the tx_ring _before_ we call post_send()
745 * because it's entirely possible that the completion handler will
746 * run before we execute anything after the post_send(). That
747 * means we have to make sure everything is properly recorded and
748 * our state is consistent before we call post_send().
749 */
750 tx_req = &tx->tx_ring[tx->tx_head & (ipoib_sendq_size - 1)];
751 tx_req->skb = skb;
752
753 if (unlikely(ipoib_dma_map_tx(priv->ca, tx_req))) {
754 ++dev->stats.tx_errors;
755 dev_kfree_skb_any(skb);
756 return;
757 }
758
759 skb_orphan(skb);
760 skb_dst_drop(skb);
761
762 rc = post_send(priv, tx, tx->tx_head & (ipoib_sendq_size - 1), tx_req);
763 if (unlikely(rc)) {
764 ipoib_warn(priv, "post_send failed, error %d\n", rc);
765 ++dev->stats.tx_errors;
766 ipoib_dma_unmap_tx(priv, tx_req);
767 dev_kfree_skb_any(skb);
768 } else {
769 netif_trans_update(dev);
770 ++tx->tx_head;
771
772 if (++priv->tx_outstanding == ipoib_sendq_size) {
773 ipoib_dbg(priv, "TX ring 0x%x full, stopping kernel net queue\n",
774 tx->qp->qp_num);
775 netif_stop_queue(dev);
776 rc = ib_req_notify_cq(priv->send_cq,
777 IB_CQ_NEXT_COMP | IB_CQ_REPORT_MISSED_EVENTS);
778 if (rc < 0)
779 ipoib_warn(priv, "request notify on send CQ failed\n");
780 else if (rc)
781 ipoib_send_comp_handler(priv->send_cq, dev);
782 }
783 }
784 }
785
786 void ipoib_cm_handle_tx_wc(struct net_device *dev, struct ib_wc *wc)
787 {
788 struct ipoib_dev_priv *priv = netdev_priv(dev);
789 struct ipoib_cm_tx *tx = wc->qp->qp_context;
790 unsigned int wr_id = wc->wr_id & ~IPOIB_OP_CM;
791 struct ipoib_tx_buf *tx_req;
792 unsigned long flags;
793
794 ipoib_dbg_data(priv, "cm send completion: id %d, status: %d\n",
795 wr_id, wc->status);
796
797 if (unlikely(wr_id >= ipoib_sendq_size)) {
798 ipoib_warn(priv, "cm send completion event with wrid %d (> %d)\n",
799 wr_id, ipoib_sendq_size);
800 return;
801 }
802
803 tx_req = &tx->tx_ring[wr_id];
804
805 ipoib_dma_unmap_tx(priv, tx_req);
806
807 /* FIXME: is this right? Shouldn't we only increment on success? */
808 ++dev->stats.tx_packets;
809 dev->stats.tx_bytes += tx_req->skb->len;
810
811 dev_kfree_skb_any(tx_req->skb);
812
813 netif_tx_lock(dev);
814
815 ++tx->tx_tail;
816 if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) &&
817 netif_queue_stopped(dev) &&
818 test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
819 netif_wake_queue(dev);
820
821 if (wc->status != IB_WC_SUCCESS &&
822 wc->status != IB_WC_WR_FLUSH_ERR) {
823 struct ipoib_neigh *neigh;
824
825 ipoib_dbg(priv, "failed cm send event "
826 "(status=%d, wrid=%d vend_err %x)\n",
827 wc->status, wr_id, wc->vendor_err);
828
829 spin_lock_irqsave(&priv->lock, flags);
830 neigh = tx->neigh;
831
832 if (neigh) {
833 neigh->cm = NULL;
834 ipoib_neigh_free(neigh);
835
836 tx->neigh = NULL;
837 }
838
839 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
840 list_move(&tx->list, &priv->cm.reap_list);
841 queue_work(priv->wq, &priv->cm.reap_task);
842 }
843
844 clear_bit(IPOIB_FLAG_OPER_UP, &tx->flags);
845
846 spin_unlock_irqrestore(&priv->lock, flags);
847 }
848
849 netif_tx_unlock(dev);
850 }
851
852 int ipoib_cm_dev_open(struct net_device *dev)
853 {
854 struct ipoib_dev_priv *priv = netdev_priv(dev);
855 int ret;
856
857 if (!IPOIB_CM_SUPPORTED(dev->dev_addr))
858 return 0;
859
860 priv->cm.id = ib_create_cm_id(priv->ca, ipoib_cm_rx_handler, dev);
861 if (IS_ERR(priv->cm.id)) {
862 printk(KERN_WARNING "%s: failed to create CM ID\n", priv->ca->name);
863 ret = PTR_ERR(priv->cm.id);
864 goto err_cm;
865 }
866
867 ret = ib_cm_listen(priv->cm.id, cpu_to_be64(IPOIB_CM_IETF_ID | priv->qp->qp_num),
868 0);
869 if (ret) {
870 printk(KERN_WARNING "%s: failed to listen on ID 0x%llx\n", priv->ca->name,
871 IPOIB_CM_IETF_ID | priv->qp->qp_num);
872 goto err_listen;
873 }
874
875 return 0;
876
877 err_listen:
878 ib_destroy_cm_id(priv->cm.id);
879 err_cm:
880 priv->cm.id = NULL;
881 return ret;
882 }
883
884 static void ipoib_cm_free_rx_reap_list(struct net_device *dev)
885 {
886 struct ipoib_dev_priv *priv = netdev_priv(dev);
887 struct ipoib_cm_rx *rx, *n;
888 LIST_HEAD(list);
889
890 spin_lock_irq(&priv->lock);
891 list_splice_init(&priv->cm.rx_reap_list, &list);
892 spin_unlock_irq(&priv->lock);
893
894 list_for_each_entry_safe(rx, n, &list, list) {
895 ib_destroy_cm_id(rx->id);
896 ib_destroy_qp(rx->qp);
897 if (!ipoib_cm_has_srq(dev)) {
898 ipoib_cm_free_rx_ring(priv->dev, rx->rx_ring);
899 spin_lock_irq(&priv->lock);
900 --priv->cm.nonsrq_conn_qp;
901 spin_unlock_irq(&priv->lock);
902 }
903 kfree(rx);
904 }
905 }
906
907 void ipoib_cm_dev_stop(struct net_device *dev)
908 {
909 struct ipoib_dev_priv *priv = netdev_priv(dev);
910 struct ipoib_cm_rx *p;
911 unsigned long begin;
912 int ret;
913
914 if (!IPOIB_CM_SUPPORTED(dev->dev_addr) || !priv->cm.id)
915 return;
916
917 ib_destroy_cm_id(priv->cm.id);
918 priv->cm.id = NULL;
919
920 spin_lock_irq(&priv->lock);
921 while (!list_empty(&priv->cm.passive_ids)) {
922 p = list_entry(priv->cm.passive_ids.next, typeof(*p), list);
923 list_move(&p->list, &priv->cm.rx_error_list);
924 p->state = IPOIB_CM_RX_ERROR;
925 spin_unlock_irq(&priv->lock);
926 ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE);
927 if (ret)
928 ipoib_warn(priv, "unable to move qp to error state: %d\n", ret);
929 spin_lock_irq(&priv->lock);
930 }
931
932 /* Wait for all RX to be drained */
933 begin = jiffies;
934
935 while (!list_empty(&priv->cm.rx_error_list) ||
936 !list_empty(&priv->cm.rx_flush_list) ||
937 !list_empty(&priv->cm.rx_drain_list)) {
938 if (time_after(jiffies, begin + 5 * HZ)) {
939 ipoib_warn(priv, "RX drain timing out\n");
940
941 /*
942 * assume the HW is wedged and just free up everything.
943 */
944 list_splice_init(&priv->cm.rx_flush_list,
945 &priv->cm.rx_reap_list);
946 list_splice_init(&priv->cm.rx_error_list,
947 &priv->cm.rx_reap_list);
948 list_splice_init(&priv->cm.rx_drain_list,
949 &priv->cm.rx_reap_list);
950 break;
951 }
952 spin_unlock_irq(&priv->lock);
953 msleep(1);
954 ipoib_drain_cq(dev);
955 spin_lock_irq(&priv->lock);
956 }
957
958 spin_unlock_irq(&priv->lock);
959
960 ipoib_cm_free_rx_reap_list(dev);
961
962 cancel_delayed_work(&priv->cm.stale_task);
963 }
964
965 static int ipoib_cm_rep_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
966 {
967 struct ipoib_cm_tx *p = cm_id->context;
968 struct ipoib_dev_priv *priv = netdev_priv(p->dev);
969 struct ipoib_cm_data *data = event->private_data;
970 struct sk_buff_head skqueue;
971 struct ib_qp_attr qp_attr;
972 int qp_attr_mask, ret;
973 struct sk_buff *skb;
974
975 p->mtu = be32_to_cpu(data->mtu);
976
977 if (p->mtu <= IPOIB_ENCAP_LEN) {
978 ipoib_warn(priv, "Rejecting connection: mtu %d <= %d\n",
979 p->mtu, IPOIB_ENCAP_LEN);
980 return -EINVAL;
981 }
982
983 qp_attr.qp_state = IB_QPS_RTR;
984 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
985 if (ret) {
986 ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret);
987 return ret;
988 }
989
990 qp_attr.rq_psn = 0 /* FIXME */;
991 ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask);
992 if (ret) {
993 ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret);
994 return ret;
995 }
996
997 qp_attr.qp_state = IB_QPS_RTS;
998 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
999 if (ret) {
1000 ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret);
1001 return ret;
1002 }
1003 ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask);
1004 if (ret) {
1005 ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret);
1006 return ret;
1007 }
1008
1009 skb_queue_head_init(&skqueue);
1010
1011 spin_lock_irq(&priv->lock);
1012 set_bit(IPOIB_FLAG_OPER_UP, &p->flags);
1013 if (p->neigh)
1014 while ((skb = __skb_dequeue(&p->neigh->queue)))
1015 __skb_queue_tail(&skqueue, skb);
1016 spin_unlock_irq(&priv->lock);
1017
1018 while ((skb = __skb_dequeue(&skqueue))) {
1019 skb->dev = p->dev;
1020 if (dev_queue_xmit(skb))
1021 ipoib_warn(priv, "dev_queue_xmit failed "
1022 "to requeue packet\n");
1023 }
1024
1025 ret = ib_send_cm_rtu(cm_id, NULL, 0);
1026 if (ret) {
1027 ipoib_warn(priv, "failed to send RTU: %d\n", ret);
1028 return ret;
1029 }
1030 return 0;
1031 }
1032
1033 static struct ib_qp *ipoib_cm_create_tx_qp(struct net_device *dev, struct ipoib_cm_tx *tx)
1034 {
1035 struct ipoib_dev_priv *priv = netdev_priv(dev);
1036 struct ib_qp_init_attr attr = {
1037 .send_cq = priv->recv_cq,
1038 .recv_cq = priv->recv_cq,
1039 .srq = priv->cm.srq,
1040 .cap.max_send_wr = ipoib_sendq_size,
1041 .cap.max_send_sge = 1,
1042 .sq_sig_type = IB_SIGNAL_ALL_WR,
1043 .qp_type = IB_QPT_RC,
1044 .qp_context = tx,
1045 .create_flags = IB_QP_CREATE_USE_GFP_NOIO
1046 };
1047
1048 struct ib_qp *tx_qp;
1049
1050 if (dev->features & NETIF_F_SG)
1051 attr.cap.max_send_sge =
1052 min_t(u32, priv->ca->attrs.max_sge, MAX_SKB_FRAGS + 1);
1053
1054 tx_qp = ib_create_qp(priv->pd, &attr);
1055 if (PTR_ERR(tx_qp) == -EINVAL) {
1056 ipoib_warn(priv, "can't use GFP_NOIO for QPs on device %s, using GFP_KERNEL\n",
1057 priv->ca->name);
1058 attr.create_flags &= ~IB_QP_CREATE_USE_GFP_NOIO;
1059 tx_qp = ib_create_qp(priv->pd, &attr);
1060 }
1061 tx->max_send_sge = attr.cap.max_send_sge;
1062 return tx_qp;
1063 }
1064
1065 static int ipoib_cm_send_req(struct net_device *dev,
1066 struct ib_cm_id *id, struct ib_qp *qp,
1067 u32 qpn,
1068 struct ib_sa_path_rec *pathrec)
1069 {
1070 struct ipoib_dev_priv *priv = netdev_priv(dev);
1071 struct ipoib_cm_data data = {};
1072 struct ib_cm_req_param req = {};
1073
1074 data.qpn = cpu_to_be32(priv->qp->qp_num);
1075 data.mtu = cpu_to_be32(IPOIB_CM_BUF_SIZE);
1076
1077 req.primary_path = pathrec;
1078 req.alternate_path = NULL;
1079 req.service_id = cpu_to_be64(IPOIB_CM_IETF_ID | qpn);
1080 req.qp_num = qp->qp_num;
1081 req.qp_type = qp->qp_type;
1082 req.private_data = &data;
1083 req.private_data_len = sizeof data;
1084 req.flow_control = 0;
1085
1086 req.starting_psn = 0; /* FIXME */
1087
1088 /*
1089 * Pick some arbitrary defaults here; we could make these
1090 * module parameters if anyone cared about setting them.
1091 */
1092 req.responder_resources = 4;
1093 req.remote_cm_response_timeout = 20;
1094 req.local_cm_response_timeout = 20;
1095 req.retry_count = 0; /* RFC draft warns against retries */
1096 req.rnr_retry_count = 0; /* RFC draft warns against retries */
1097 req.max_cm_retries = 15;
1098 req.srq = ipoib_cm_has_srq(dev);
1099 return ib_send_cm_req(id, &req);
1100 }
1101
1102 static int ipoib_cm_modify_tx_init(struct net_device *dev,
1103 struct ib_cm_id *cm_id, struct ib_qp *qp)
1104 {
1105 struct ipoib_dev_priv *priv = netdev_priv(dev);
1106 struct ib_qp_attr qp_attr;
1107 int qp_attr_mask, ret;
1108 ret = ib_find_pkey(priv->ca, priv->port, priv->pkey, &qp_attr.pkey_index);
1109 if (ret) {
1110 ipoib_warn(priv, "pkey 0x%x not found: %d\n", priv->pkey, ret);
1111 return ret;
1112 }
1113
1114 qp_attr.qp_state = IB_QPS_INIT;
1115 qp_attr.qp_access_flags = IB_ACCESS_LOCAL_WRITE;
1116 qp_attr.port_num = priv->port;
1117 qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS | IB_QP_PKEY_INDEX | IB_QP_PORT;
1118
1119 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
1120 if (ret) {
1121 ipoib_warn(priv, "failed to modify tx QP to INIT: %d\n", ret);
1122 return ret;
1123 }
1124 return 0;
1125 }
1126
1127 static int ipoib_cm_tx_init(struct ipoib_cm_tx *p, u32 qpn,
1128 struct ib_sa_path_rec *pathrec)
1129 {
1130 struct ipoib_dev_priv *priv = netdev_priv(p->dev);
1131 int ret;
1132
1133 p->tx_ring = __vmalloc(ipoib_sendq_size * sizeof *p->tx_ring,
1134 GFP_NOIO, PAGE_KERNEL);
1135 if (!p->tx_ring) {
1136 ipoib_warn(priv, "failed to allocate tx ring\n");
1137 ret = -ENOMEM;
1138 goto err_tx;
1139 }
1140 memset(p->tx_ring, 0, ipoib_sendq_size * sizeof *p->tx_ring);
1141
1142 p->qp = ipoib_cm_create_tx_qp(p->dev, p);
1143 if (IS_ERR(p->qp)) {
1144 ret = PTR_ERR(p->qp);
1145 ipoib_warn(priv, "failed to allocate tx qp: %d\n", ret);
1146 goto err_qp;
1147 }
1148
1149 p->id = ib_create_cm_id(priv->ca, ipoib_cm_tx_handler, p);
1150 if (IS_ERR(p->id)) {
1151 ret = PTR_ERR(p->id);
1152 ipoib_warn(priv, "failed to create tx cm id: %d\n", ret);
1153 goto err_id;
1154 }
1155
1156 ret = ipoib_cm_modify_tx_init(p->dev, p->id, p->qp);
1157 if (ret) {
1158 ipoib_warn(priv, "failed to modify tx qp to rtr: %d\n", ret);
1159 goto err_modify;
1160 }
1161
1162 ret = ipoib_cm_send_req(p->dev, p->id, p->qp, qpn, pathrec);
1163 if (ret) {
1164 ipoib_warn(priv, "failed to send cm req: %d\n", ret);
1165 goto err_send_cm;
1166 }
1167
1168 ipoib_dbg(priv, "Request connection 0x%x for gid %pI6 qpn 0x%x\n",
1169 p->qp->qp_num, pathrec->dgid.raw, qpn);
1170
1171 return 0;
1172
1173 err_send_cm:
1174 err_modify:
1175 ib_destroy_cm_id(p->id);
1176 err_id:
1177 p->id = NULL;
1178 ib_destroy_qp(p->qp);
1179 err_qp:
1180 p->qp = NULL;
1181 vfree(p->tx_ring);
1182 err_tx:
1183 return ret;
1184 }
1185
1186 static void ipoib_cm_tx_destroy(struct ipoib_cm_tx *p)
1187 {
1188 struct ipoib_dev_priv *priv = netdev_priv(p->dev);
1189 struct ipoib_tx_buf *tx_req;
1190 unsigned long begin;
1191
1192 ipoib_dbg(priv, "Destroy active connection 0x%x head 0x%x tail 0x%x\n",
1193 p->qp ? p->qp->qp_num : 0, p->tx_head, p->tx_tail);
1194
1195 if (p->id)
1196 ib_destroy_cm_id(p->id);
1197
1198 if (p->tx_ring) {
1199 /* Wait for all sends to complete */
1200 begin = jiffies;
1201 while ((int) p->tx_tail - (int) p->tx_head < 0) {
1202 if (time_after(jiffies, begin + 5 * HZ)) {
1203 ipoib_warn(priv, "timing out; %d sends not completed\n",
1204 p->tx_head - p->tx_tail);
1205 goto timeout;
1206 }
1207
1208 msleep(1);
1209 }
1210 }
1211
1212 timeout:
1213
1214 while ((int) p->tx_tail - (int) p->tx_head < 0) {
1215 tx_req = &p->tx_ring[p->tx_tail & (ipoib_sendq_size - 1)];
1216 ipoib_dma_unmap_tx(priv, tx_req);
1217 dev_kfree_skb_any(tx_req->skb);
1218 ++p->tx_tail;
1219 netif_tx_lock_bh(p->dev);
1220 if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) &&
1221 netif_queue_stopped(p->dev) &&
1222 test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
1223 netif_wake_queue(p->dev);
1224 netif_tx_unlock_bh(p->dev);
1225 }
1226
1227 if (p->qp)
1228 ib_destroy_qp(p->qp);
1229
1230 vfree(p->tx_ring);
1231 kfree(p);
1232 }
1233
1234 static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id,
1235 struct ib_cm_event *event)
1236 {
1237 struct ipoib_cm_tx *tx = cm_id->context;
1238 struct ipoib_dev_priv *priv = netdev_priv(tx->dev);
1239 struct net_device *dev = priv->dev;
1240 struct ipoib_neigh *neigh;
1241 unsigned long flags;
1242 int ret;
1243
1244 switch (event->event) {
1245 case IB_CM_DREQ_RECEIVED:
1246 ipoib_dbg(priv, "DREQ received.\n");
1247 ib_send_cm_drep(cm_id, NULL, 0);
1248 break;
1249 case IB_CM_REP_RECEIVED:
1250 ipoib_dbg(priv, "REP received.\n");
1251 ret = ipoib_cm_rep_handler(cm_id, event);
1252 if (ret)
1253 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
1254 NULL, 0, NULL, 0);
1255 break;
1256 case IB_CM_REQ_ERROR:
1257 case IB_CM_REJ_RECEIVED:
1258 case IB_CM_TIMEWAIT_EXIT:
1259 ipoib_dbg(priv, "CM error %d.\n", event->event);
1260 netif_tx_lock_bh(dev);
1261 spin_lock_irqsave(&priv->lock, flags);
1262 neigh = tx->neigh;
1263
1264 if (neigh) {
1265 neigh->cm = NULL;
1266 ipoib_neigh_free(neigh);
1267
1268 tx->neigh = NULL;
1269 }
1270
1271 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
1272 list_move(&tx->list, &priv->cm.reap_list);
1273 queue_work(priv->wq, &priv->cm.reap_task);
1274 }
1275
1276 spin_unlock_irqrestore(&priv->lock, flags);
1277 netif_tx_unlock_bh(dev);
1278 break;
1279 default:
1280 break;
1281 }
1282
1283 return 0;
1284 }
1285
1286 struct ipoib_cm_tx *ipoib_cm_create_tx(struct net_device *dev, struct ipoib_path *path,
1287 struct ipoib_neigh *neigh)
1288 {
1289 struct ipoib_dev_priv *priv = netdev_priv(dev);
1290 struct ipoib_cm_tx *tx;
1291
1292 tx = kzalloc(sizeof *tx, GFP_ATOMIC);
1293 if (!tx)
1294 return NULL;
1295
1296 neigh->cm = tx;
1297 tx->neigh = neigh;
1298 tx->path = path;
1299 tx->dev = dev;
1300 list_add(&tx->list, &priv->cm.start_list);
1301 set_bit(IPOIB_FLAG_INITIALIZED, &tx->flags);
1302 queue_work(priv->wq, &priv->cm.start_task);
1303 return tx;
1304 }
1305
1306 void ipoib_cm_destroy_tx(struct ipoib_cm_tx *tx)
1307 {
1308 struct ipoib_dev_priv *priv = netdev_priv(tx->dev);
1309 unsigned long flags;
1310 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
1311 spin_lock_irqsave(&priv->lock, flags);
1312 list_move(&tx->list, &priv->cm.reap_list);
1313 queue_work(priv->wq, &priv->cm.reap_task);
1314 ipoib_dbg(priv, "Reap connection for gid %pI6\n",
1315 tx->neigh->daddr + 4);
1316 tx->neigh = NULL;
1317 spin_unlock_irqrestore(&priv->lock, flags);
1318 }
1319 }
1320
1321 #define QPN_AND_OPTIONS_OFFSET 4
1322
1323 static void ipoib_cm_tx_start(struct work_struct *work)
1324 {
1325 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1326 cm.start_task);
1327 struct net_device *dev = priv->dev;
1328 struct ipoib_neigh *neigh;
1329 struct ipoib_cm_tx *p;
1330 unsigned long flags;
1331 struct ipoib_path *path;
1332 int ret;
1333
1334 struct ib_sa_path_rec pathrec;
1335 u32 qpn;
1336
1337 netif_tx_lock_bh(dev);
1338 spin_lock_irqsave(&priv->lock, flags);
1339
1340 while (!list_empty(&priv->cm.start_list)) {
1341 p = list_entry(priv->cm.start_list.next, typeof(*p), list);
1342 list_del_init(&p->list);
1343 neigh = p->neigh;
1344
1345 qpn = IPOIB_QPN(neigh->daddr);
1346 /*
1347 * As long as the search is with these 2 locks,
1348 * path existence indicates its validity.
1349 */
1350 path = __path_find(dev, neigh->daddr + QPN_AND_OPTIONS_OFFSET);
1351 if (!path) {
1352 pr_info("%s ignore not valid path %pI6\n",
1353 __func__,
1354 neigh->daddr + QPN_AND_OPTIONS_OFFSET);
1355 goto free_neigh;
1356 }
1357 memcpy(&pathrec, &p->path->pathrec, sizeof pathrec);
1358
1359 spin_unlock_irqrestore(&priv->lock, flags);
1360 netif_tx_unlock_bh(dev);
1361
1362 ret = ipoib_cm_tx_init(p, qpn, &pathrec);
1363
1364 netif_tx_lock_bh(dev);
1365 spin_lock_irqsave(&priv->lock, flags);
1366
1367 if (ret) {
1368 free_neigh:
1369 neigh = p->neigh;
1370 if (neigh) {
1371 neigh->cm = NULL;
1372 ipoib_neigh_free(neigh);
1373 }
1374 list_del(&p->list);
1375 kfree(p);
1376 }
1377 }
1378
1379 spin_unlock_irqrestore(&priv->lock, flags);
1380 netif_tx_unlock_bh(dev);
1381 }
1382
1383 static void ipoib_cm_tx_reap(struct work_struct *work)
1384 {
1385 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1386 cm.reap_task);
1387 struct net_device *dev = priv->dev;
1388 struct ipoib_cm_tx *p;
1389 unsigned long flags;
1390
1391 netif_tx_lock_bh(dev);
1392 spin_lock_irqsave(&priv->lock, flags);
1393
1394 while (!list_empty(&priv->cm.reap_list)) {
1395 p = list_entry(priv->cm.reap_list.next, typeof(*p), list);
1396 list_del(&p->list);
1397 spin_unlock_irqrestore(&priv->lock, flags);
1398 netif_tx_unlock_bh(dev);
1399 ipoib_cm_tx_destroy(p);
1400 netif_tx_lock_bh(dev);
1401 spin_lock_irqsave(&priv->lock, flags);
1402 }
1403
1404 spin_unlock_irqrestore(&priv->lock, flags);
1405 netif_tx_unlock_bh(dev);
1406 }
1407
1408 static void ipoib_cm_skb_reap(struct work_struct *work)
1409 {
1410 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1411 cm.skb_task);
1412 struct net_device *dev = priv->dev;
1413 struct sk_buff *skb;
1414 unsigned long flags;
1415 unsigned mtu = priv->mcast_mtu;
1416
1417 netif_tx_lock_bh(dev);
1418 spin_lock_irqsave(&priv->lock, flags);
1419
1420 while ((skb = skb_dequeue(&priv->cm.skb_queue))) {
1421 spin_unlock_irqrestore(&priv->lock, flags);
1422 netif_tx_unlock_bh(dev);
1423
1424 if (skb->protocol == htons(ETH_P_IP))
1425 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu));
1426 #if IS_ENABLED(CONFIG_IPV6)
1427 else if (skb->protocol == htons(ETH_P_IPV6))
1428 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1429 #endif
1430 dev_kfree_skb_any(skb);
1431
1432 netif_tx_lock_bh(dev);
1433 spin_lock_irqsave(&priv->lock, flags);
1434 }
1435
1436 spin_unlock_irqrestore(&priv->lock, flags);
1437 netif_tx_unlock_bh(dev);
1438 }
1439
1440 void ipoib_cm_skb_too_long(struct net_device *dev, struct sk_buff *skb,
1441 unsigned int mtu)
1442 {
1443 struct ipoib_dev_priv *priv = netdev_priv(dev);
1444 int e = skb_queue_empty(&priv->cm.skb_queue);
1445
1446 if (skb_dst(skb))
1447 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
1448
1449 skb_queue_tail(&priv->cm.skb_queue, skb);
1450 if (e)
1451 queue_work(priv->wq, &priv->cm.skb_task);
1452 }
1453
1454 static void ipoib_cm_rx_reap(struct work_struct *work)
1455 {
1456 ipoib_cm_free_rx_reap_list(container_of(work, struct ipoib_dev_priv,
1457 cm.rx_reap_task)->dev);
1458 }
1459
1460 static void ipoib_cm_stale_task(struct work_struct *work)
1461 {
1462 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1463 cm.stale_task.work);
1464 struct ipoib_cm_rx *p;
1465 int ret;
1466
1467 spin_lock_irq(&priv->lock);
1468 while (!list_empty(&priv->cm.passive_ids)) {
1469 /* List is sorted by LRU, start from tail,
1470 * stop when we see a recently used entry */
1471 p = list_entry(priv->cm.passive_ids.prev, typeof(*p), list);
1472 if (time_before_eq(jiffies, p->jiffies + IPOIB_CM_RX_TIMEOUT))
1473 break;
1474 list_move(&p->list, &priv->cm.rx_error_list);
1475 p->state = IPOIB_CM_RX_ERROR;
1476 spin_unlock_irq(&priv->lock);
1477 ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE);
1478 if (ret)
1479 ipoib_warn(priv, "unable to move qp to error state: %d\n", ret);
1480 spin_lock_irq(&priv->lock);
1481 }
1482
1483 if (!list_empty(&priv->cm.passive_ids))
1484 queue_delayed_work(priv->wq,
1485 &priv->cm.stale_task, IPOIB_CM_RX_DELAY);
1486 spin_unlock_irq(&priv->lock);
1487 }
1488
1489 static ssize_t show_mode(struct device *d, struct device_attribute *attr,
1490 char *buf)
1491 {
1492 struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(d));
1493
1494 if (test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags))
1495 return sprintf(buf, "connected\n");
1496 else
1497 return sprintf(buf, "datagram\n");
1498 }
1499
1500 static ssize_t set_mode(struct device *d, struct device_attribute *attr,
1501 const char *buf, size_t count)
1502 {
1503 struct net_device *dev = to_net_dev(d);
1504 int ret;
1505 struct ipoib_dev_priv *priv = netdev_priv(dev);
1506
1507 if (test_bit(IPOIB_FLAG_GOING_DOWN, &priv->flags))
1508 return -EPERM;
1509
1510 if (!rtnl_trylock())
1511 return restart_syscall();
1512
1513 ret = ipoib_set_mode(dev, buf);
1514
1515 rtnl_unlock();
1516
1517 if (!ret)
1518 return count;
1519
1520 return ret;
1521 }
1522
1523 static DEVICE_ATTR(mode, S_IWUSR | S_IRUGO, show_mode, set_mode);
1524
1525 int ipoib_cm_add_mode_attr(struct net_device *dev)
1526 {
1527 return device_create_file(&dev->dev, &dev_attr_mode);
1528 }
1529
1530 static void ipoib_cm_create_srq(struct net_device *dev, int max_sge)
1531 {
1532 struct ipoib_dev_priv *priv = netdev_priv(dev);
1533 struct ib_srq_init_attr srq_init_attr = {
1534 .srq_type = IB_SRQT_BASIC,
1535 .attr = {
1536 .max_wr = ipoib_recvq_size,
1537 .max_sge = max_sge
1538 }
1539 };
1540
1541 priv->cm.srq = ib_create_srq(priv->pd, &srq_init_attr);
1542 if (IS_ERR(priv->cm.srq)) {
1543 if (PTR_ERR(priv->cm.srq) != -ENOSYS)
1544 printk(KERN_WARNING "%s: failed to allocate SRQ, error %ld\n",
1545 priv->ca->name, PTR_ERR(priv->cm.srq));
1546 priv->cm.srq = NULL;
1547 return;
1548 }
1549
1550 priv->cm.srq_ring = vzalloc(ipoib_recvq_size * sizeof *priv->cm.srq_ring);
1551 if (!priv->cm.srq_ring) {
1552 printk(KERN_WARNING "%s: failed to allocate CM SRQ ring (%d entries)\n",
1553 priv->ca->name, ipoib_recvq_size);
1554 ib_destroy_srq(priv->cm.srq);
1555 priv->cm.srq = NULL;
1556 return;
1557 }
1558
1559 }
1560
1561 int ipoib_cm_dev_init(struct net_device *dev)
1562 {
1563 struct ipoib_dev_priv *priv = netdev_priv(dev);
1564 int max_srq_sge, i;
1565
1566 INIT_LIST_HEAD(&priv->cm.passive_ids);
1567 INIT_LIST_HEAD(&priv->cm.reap_list);
1568 INIT_LIST_HEAD(&priv->cm.start_list);
1569 INIT_LIST_HEAD(&priv->cm.rx_error_list);
1570 INIT_LIST_HEAD(&priv->cm.rx_flush_list);
1571 INIT_LIST_HEAD(&priv->cm.rx_drain_list);
1572 INIT_LIST_HEAD(&priv->cm.rx_reap_list);
1573 INIT_WORK(&priv->cm.start_task, ipoib_cm_tx_start);
1574 INIT_WORK(&priv->cm.reap_task, ipoib_cm_tx_reap);
1575 INIT_WORK(&priv->cm.skb_task, ipoib_cm_skb_reap);
1576 INIT_WORK(&priv->cm.rx_reap_task, ipoib_cm_rx_reap);
1577 INIT_DELAYED_WORK(&priv->cm.stale_task, ipoib_cm_stale_task);
1578
1579 skb_queue_head_init(&priv->cm.skb_queue);
1580
1581 ipoib_dbg(priv, "max_srq_sge=%d\n", priv->ca->attrs.max_srq_sge);
1582
1583 max_srq_sge = min_t(int, IPOIB_CM_RX_SG, priv->ca->attrs.max_srq_sge);
1584 ipoib_cm_create_srq(dev, max_srq_sge);
1585 if (ipoib_cm_has_srq(dev)) {
1586 priv->cm.max_cm_mtu = max_srq_sge * PAGE_SIZE - 0x10;
1587 priv->cm.num_frags = max_srq_sge;
1588 ipoib_dbg(priv, "max_cm_mtu = 0x%x, num_frags=%d\n",
1589 priv->cm.max_cm_mtu, priv->cm.num_frags);
1590 } else {
1591 priv->cm.max_cm_mtu = IPOIB_CM_MTU;
1592 priv->cm.num_frags = IPOIB_CM_RX_SG;
1593 }
1594
1595 ipoib_cm_init_rx_wr(dev, &priv->cm.rx_wr, priv->cm.rx_sge);
1596
1597 if (ipoib_cm_has_srq(dev)) {
1598 for (i = 0; i < ipoib_recvq_size; ++i) {
1599 if (!ipoib_cm_alloc_rx_skb(dev, priv->cm.srq_ring, i,
1600 priv->cm.num_frags - 1,
1601 priv->cm.srq_ring[i].mapping,
1602 GFP_KERNEL)) {
1603 ipoib_warn(priv, "failed to allocate "
1604 "receive buffer %d\n", i);
1605 ipoib_cm_dev_cleanup(dev);
1606 return -ENOMEM;
1607 }
1608
1609 if (ipoib_cm_post_receive_srq(dev, i)) {
1610 ipoib_warn(priv, "ipoib_cm_post_receive_srq "
1611 "failed for buf %d\n", i);
1612 ipoib_cm_dev_cleanup(dev);
1613 return -EIO;
1614 }
1615 }
1616 }
1617
1618 priv->dev->dev_addr[0] = IPOIB_FLAGS_RC;
1619 return 0;
1620 }
1621
1622 void ipoib_cm_dev_cleanup(struct net_device *dev)
1623 {
1624 struct ipoib_dev_priv *priv = netdev_priv(dev);
1625 int ret;
1626
1627 if (!priv->cm.srq)
1628 return;
1629
1630 ipoib_dbg(priv, "Cleanup ipoib connected mode.\n");
1631
1632 ret = ib_destroy_srq(priv->cm.srq);
1633 if (ret)
1634 ipoib_warn(priv, "ib_destroy_srq failed: %d\n", ret);
1635
1636 priv->cm.srq = NULL;
1637 if (!priv->cm.srq_ring)
1638 return;
1639
1640 ipoib_cm_free_rx_ring(dev, priv->cm.srq_ring);
1641 priv->cm.srq_ring = NULL;
1642 }
Linux kernel - Deliverables
This page took 0.067778 seconds and 5 git commands to generate.