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x86/topology: Fix function name in documentation
[cris-mirror.git] / drivers / infiniband / ulp / ipoib / ipoib_cm.c
blob962fbcb57dc7fe3034c83d1e1cb75144aa27ca23
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 #include <linux/sched/signal.h>
42 #include <linux/sched/mm.h>
43
44 #include "ipoib.h"
45
46 int ipoib_max_conn_qp = 128;
47
48 module_param_named(max_nonsrq_conn_qp, ipoib_max_conn_qp, int, 0444);
49 MODULE_PARM_DESC(max_nonsrq_conn_qp,
50 "Max number of connected-mode QPs per interface "
51 "(applied only if shared receive queue is not available)");
52
53 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG_DATA
54 static int data_debug_level;
55
56 module_param_named(cm_data_debug_level, data_debug_level, int, 0644);
57 MODULE_PARM_DESC(cm_data_debug_level,
58 "Enable data path debug tracing for connected mode if > 0");
59 #endif
60
61 #define IPOIB_CM_IETF_ID 0x1000000000000000ULL
62
63 #define IPOIB_CM_RX_UPDATE_TIME (256 * HZ)
64 #define IPOIB_CM_RX_TIMEOUT (2 * 256 * HZ)
65 #define IPOIB_CM_RX_DELAY (3 * 256 * HZ)
66 #define IPOIB_CM_RX_UPDATE_MASK (0x3)
67
68 #define IPOIB_CM_RX_RESERVE (ALIGN(IPOIB_HARD_LEN, 16) - IPOIB_ENCAP_LEN)
69
70 static struct ib_qp_attr ipoib_cm_err_attr = {
71 .qp_state = IB_QPS_ERR
72 };
73
74 #define IPOIB_CM_RX_DRAIN_WRID 0xffffffff
75
76 static struct ib_send_wr ipoib_cm_rx_drain_wr = {
77 .opcode = IB_WR_SEND,
78 };
79
80 static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id,
81 struct ib_cm_event *event);
82
83 static void ipoib_cm_dma_unmap_rx(struct ipoib_dev_priv *priv, int frags,
84 u64 mapping[IPOIB_CM_RX_SG])
85 {
86 int i;
87
88 ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_CM_HEAD_SIZE, DMA_FROM_DEVICE);
89
90 for (i = 0; i < frags; ++i)
91 ib_dma_unmap_page(priv->ca, mapping[i + 1], PAGE_SIZE, DMA_FROM_DEVICE);
92 }
93
94 static int ipoib_cm_post_receive_srq(struct net_device *dev, int id)
95 {
96 struct ipoib_dev_priv *priv = ipoib_priv(dev);
97 struct ib_recv_wr *bad_wr;
98 int i, ret;
99
100 priv->cm.rx_wr.wr_id = id | IPOIB_OP_CM | IPOIB_OP_RECV;
101
102 for (i = 0; i < priv->cm.num_frags; ++i)
103 priv->cm.rx_sge[i].addr = priv->cm.srq_ring[id].mapping[i];
104
105 ret = ib_post_srq_recv(priv->cm.srq, &priv->cm.rx_wr, &bad_wr);
106 if (unlikely(ret)) {
107 ipoib_warn(priv, "post srq failed for buf %d (%d)\n", id, ret);
108 ipoib_cm_dma_unmap_rx(priv, priv->cm.num_frags - 1,
109 priv->cm.srq_ring[id].mapping);
110 dev_kfree_skb_any(priv->cm.srq_ring[id].skb);
111 priv->cm.srq_ring[id].skb = NULL;
112 }
113
114 return ret;
115 }
116
117 static int ipoib_cm_post_receive_nonsrq(struct net_device *dev,
118 struct ipoib_cm_rx *rx,
119 struct ib_recv_wr *wr,
120 struct ib_sge *sge, int id)
121 {
122 struct ipoib_dev_priv *priv = ipoib_priv(dev);
123 struct ib_recv_wr *bad_wr;
124 int i, ret;
125
126 wr->wr_id = id | IPOIB_OP_CM | IPOIB_OP_RECV;
127
128 for (i = 0; i < IPOIB_CM_RX_SG; ++i)
129 sge[i].addr = rx->rx_ring[id].mapping[i];
130
131 ret = ib_post_recv(rx->qp, wr, &bad_wr);
132 if (unlikely(ret)) {
133 ipoib_warn(priv, "post recv failed for buf %d (%d)\n", id, ret);
134 ipoib_cm_dma_unmap_rx(priv, IPOIB_CM_RX_SG - 1,
135 rx->rx_ring[id].mapping);
136 dev_kfree_skb_any(rx->rx_ring[id].skb);
137 rx->rx_ring[id].skb = NULL;
138 }
139
140 return ret;
141 }
142
143 static struct sk_buff *ipoib_cm_alloc_rx_skb(struct net_device *dev,
144 struct ipoib_cm_rx_buf *rx_ring,
145 int id, int frags,
146 u64 mapping[IPOIB_CM_RX_SG],
147 gfp_t gfp)
148 {
149 struct ipoib_dev_priv *priv = ipoib_priv(dev);
150 struct sk_buff *skb;
151 int i;
152
153 skb = dev_alloc_skb(ALIGN(IPOIB_CM_HEAD_SIZE + IPOIB_PSEUDO_LEN, 16));
154 if (unlikely(!skb))
155 return NULL;
156
157 /*
158 * IPoIB adds a IPOIB_ENCAP_LEN byte header, this will align the
159 * IP header to a multiple of 16.
160 */
161 skb_reserve(skb, IPOIB_CM_RX_RESERVE);
162
163 mapping[0] = ib_dma_map_single(priv->ca, skb->data, IPOIB_CM_HEAD_SIZE,
164 DMA_FROM_DEVICE);
165 if (unlikely(ib_dma_mapping_error(priv->ca, mapping[0]))) {
166 dev_kfree_skb_any(skb);
167 return NULL;
168 }
169
170 for (i = 0; i < frags; i++) {
171 struct page *page = alloc_page(gfp);
172
173 if (!page)
174 goto partial_error;
175 skb_fill_page_desc(skb, i, page, 0, PAGE_SIZE);
176
177 mapping[i + 1] = ib_dma_map_page(priv->ca, page,
178 0, PAGE_SIZE, DMA_FROM_DEVICE);
179 if (unlikely(ib_dma_mapping_error(priv->ca, mapping[i + 1])))
180 goto partial_error;
181 }
182
183 rx_ring[id].skb = skb;
184 return skb;
185
186 partial_error:
187
188 ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_CM_HEAD_SIZE, DMA_FROM_DEVICE);
189
190 for (; i > 0; --i)
191 ib_dma_unmap_page(priv->ca, mapping[i], PAGE_SIZE, DMA_FROM_DEVICE);
192
193 dev_kfree_skb_any(skb);
194 return NULL;
195 }
196
197 static void ipoib_cm_free_rx_ring(struct net_device *dev,
198 struct ipoib_cm_rx_buf *rx_ring)
199 {
200 struct ipoib_dev_priv *priv = ipoib_priv(dev);
201 int i;
202
203 for (i = 0; i < ipoib_recvq_size; ++i)
204 if (rx_ring[i].skb) {
205 ipoib_cm_dma_unmap_rx(priv, IPOIB_CM_RX_SG - 1,
206 rx_ring[i].mapping);
207 dev_kfree_skb_any(rx_ring[i].skb);
208 }
209
210 vfree(rx_ring);
211 }
212
213 static void ipoib_cm_start_rx_drain(struct ipoib_dev_priv *priv)
214 {
215 struct ib_send_wr *bad_wr;
216 struct ipoib_cm_rx *p;
217
218 /* We only reserved 1 extra slot in CQ for drain WRs, so
219 * make sure we have at most 1 outstanding WR. */
220 if (list_empty(&priv->cm.rx_flush_list) ||
221 !list_empty(&priv->cm.rx_drain_list))
222 return;
223
224 /*
225 * QPs on flush list are error state. This way, a "flush
226 * error" WC will be immediately generated for each WR we post.
227 */
228 p = list_entry(priv->cm.rx_flush_list.next, typeof(*p), list);
229 ipoib_cm_rx_drain_wr.wr_id = IPOIB_CM_RX_DRAIN_WRID;
230 if (ib_post_send(p->qp, &ipoib_cm_rx_drain_wr, &bad_wr))
231 ipoib_warn(priv, "failed to post drain wr\n");
232
233 list_splice_init(&priv->cm.rx_flush_list, &priv->cm.rx_drain_list);
234 }
235
236 static void ipoib_cm_rx_event_handler(struct ib_event *event, void *ctx)
237 {
238 struct ipoib_cm_rx *p = ctx;
239 struct ipoib_dev_priv *priv = ipoib_priv(p->dev);
240 unsigned long flags;
241
242 if (event->event != IB_EVENT_QP_LAST_WQE_REACHED)
243 return;
244
245 spin_lock_irqsave(&priv->lock, flags);
246 list_move(&p->list, &priv->cm.rx_flush_list);
247 p->state = IPOIB_CM_RX_FLUSH;
248 ipoib_cm_start_rx_drain(priv);
249 spin_unlock_irqrestore(&priv->lock, flags);
250 }
251
252 static struct ib_qp *ipoib_cm_create_rx_qp(struct net_device *dev,
253 struct ipoib_cm_rx *p)
254 {
255 struct ipoib_dev_priv *priv = ipoib_priv(dev);
256 struct ib_qp_init_attr attr = {
257 .event_handler = ipoib_cm_rx_event_handler,
258 .send_cq = priv->recv_cq, /* For drain WR */
259 .recv_cq = priv->recv_cq,
260 .srq = priv->cm.srq,
261 .cap.max_send_wr = 1, /* For drain WR */
262 .cap.max_send_sge = 1, /* FIXME: 0 Seems not to work */
263 .sq_sig_type = IB_SIGNAL_ALL_WR,
264 .qp_type = IB_QPT_RC,
265 .qp_context = p,
266 };
267
268 if (!ipoib_cm_has_srq(dev)) {
269 attr.cap.max_recv_wr = ipoib_recvq_size;
270 attr.cap.max_recv_sge = IPOIB_CM_RX_SG;
271 }
272
273 return ib_create_qp(priv->pd, &attr);
274 }
275
276 static int ipoib_cm_modify_rx_qp(struct net_device *dev,
277 struct ib_cm_id *cm_id, struct ib_qp *qp,
278 unsigned psn)
279 {
280 struct ipoib_dev_priv *priv = ipoib_priv(dev);
281 struct ib_qp_attr qp_attr;
282 int qp_attr_mask, ret;
283
284 qp_attr.qp_state = IB_QPS_INIT;
285 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
286 if (ret) {
287 ipoib_warn(priv, "failed to init QP attr for INIT: %d\n", ret);
288 return ret;
289 }
290 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
291 if (ret) {
292 ipoib_warn(priv, "failed to modify QP to INIT: %d\n", ret);
293 return ret;
294 }
295 qp_attr.qp_state = IB_QPS_RTR;
296 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
297 if (ret) {
298 ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret);
299 return ret;
300 }
301 qp_attr.rq_psn = psn;
302 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
303 if (ret) {
304 ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret);
305 return ret;
306 }
307
308 /*
309 * Current Mellanox HCA firmware won't generate completions
310 * with error for drain WRs unless the QP has been moved to
311 * RTS first. This work-around leaves a window where a QP has
312 * moved to error asynchronously, but this will eventually get
313 * fixed in firmware, so let's not error out if modify QP
314 * fails.
315 */
316 qp_attr.qp_state = IB_QPS_RTS;
317 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
318 if (ret) {
319 ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret);
320 return 0;
321 }
322 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
323 if (ret) {
324 ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret);
325 return 0;
326 }
327
328 return 0;
329 }
330
331 static void ipoib_cm_init_rx_wr(struct net_device *dev,
332 struct ib_recv_wr *wr,
333 struct ib_sge *sge)
334 {
335 struct ipoib_dev_priv *priv = ipoib_priv(dev);
336 int i;
337
338 for (i = 0; i < priv->cm.num_frags; ++i)
339 sge[i].lkey = priv->pd->local_dma_lkey;
340
341 sge[0].length = IPOIB_CM_HEAD_SIZE;
342 for (i = 1; i < priv->cm.num_frags; ++i)
343 sge[i].length = PAGE_SIZE;
344
345 wr->next = NULL;
346 wr->sg_list = sge;
347 wr->num_sge = priv->cm.num_frags;
348 }
349
350 static int ipoib_cm_nonsrq_init_rx(struct net_device *dev, struct ib_cm_id *cm_id,
351 struct ipoib_cm_rx *rx)
352 {
353 struct ipoib_dev_priv *priv = ipoib_priv(dev);
354 struct {
355 struct ib_recv_wr wr;
356 struct ib_sge sge[IPOIB_CM_RX_SG];
357 } *t;
358 int ret;
359 int i;
360
361 rx->rx_ring = vzalloc(ipoib_recvq_size * sizeof *rx->rx_ring);
362 if (!rx->rx_ring)
363 return -ENOMEM;
364
365 t = kmalloc(sizeof *t, GFP_KERNEL);
366 if (!t) {
367 ret = -ENOMEM;
368 goto err_free_1;
369 }
370
371 ipoib_cm_init_rx_wr(dev, &t->wr, t->sge);
372
373 spin_lock_irq(&priv->lock);
374
375 if (priv->cm.nonsrq_conn_qp >= ipoib_max_conn_qp) {
376 spin_unlock_irq(&priv->lock);
377 ib_send_cm_rej(cm_id, IB_CM_REJ_NO_QP, NULL, 0, NULL, 0);
378 ret = -EINVAL;
379 goto err_free;
380 } else
381 ++priv->cm.nonsrq_conn_qp;
382
383 spin_unlock_irq(&priv->lock);
384
385 for (i = 0; i < ipoib_recvq_size; ++i) {
386 if (!ipoib_cm_alloc_rx_skb(dev, rx->rx_ring, i, IPOIB_CM_RX_SG - 1,
387 rx->rx_ring[i].mapping,
388 GFP_KERNEL)) {
389 ipoib_warn(priv, "failed to allocate receive buffer %d\n", i);
390 ret = -ENOMEM;
391 goto err_count;
392 }
393 ret = ipoib_cm_post_receive_nonsrq(dev, rx, &t->wr, t->sge, i);
394 if (ret) {
395 ipoib_warn(priv, "ipoib_cm_post_receive_nonsrq "
396 "failed for buf %d\n", i);
397 ret = -EIO;
398 goto err_count;
399 }
400 }
401
402 rx->recv_count = ipoib_recvq_size;
403
404 kfree(t);
405
406 return 0;
407
408 err_count:
409 spin_lock_irq(&priv->lock);
410 --priv->cm.nonsrq_conn_qp;
411 spin_unlock_irq(&priv->lock);
412
413 err_free:
414 kfree(t);
415
416 err_free_1:
417 ipoib_cm_free_rx_ring(dev, rx->rx_ring);
418
419 return ret;
420 }
421
422 static int ipoib_cm_send_rep(struct net_device *dev, struct ib_cm_id *cm_id,
423 struct ib_qp *qp, struct ib_cm_req_event_param *req,
424 unsigned psn)
425 {
426 struct ipoib_dev_priv *priv = ipoib_priv(dev);
427 struct ipoib_cm_data data = {};
428 struct ib_cm_rep_param rep = {};
429
430 data.qpn = cpu_to_be32(priv->qp->qp_num);
431 data.mtu = cpu_to_be32(IPOIB_CM_BUF_SIZE);
432
433 rep.private_data = &data;
434 rep.private_data_len = sizeof data;
435 rep.flow_control = 0;
436 rep.rnr_retry_count = req->rnr_retry_count;
437 rep.srq = ipoib_cm_has_srq(dev);
438 rep.qp_num = qp->qp_num;
439 rep.starting_psn = psn;
440 return ib_send_cm_rep(cm_id, &rep);
441 }
442
443 static int ipoib_cm_req_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
444 {
445 struct net_device *dev = cm_id->context;
446 struct ipoib_dev_priv *priv = ipoib_priv(dev);
447 struct ipoib_cm_rx *p;
448 unsigned psn;
449 int ret;
450
451 ipoib_dbg(priv, "REQ arrived\n");
452 p = kzalloc(sizeof *p, GFP_KERNEL);
453 if (!p)
454 return -ENOMEM;
455 p->dev = dev;
456 p->id = cm_id;
457 cm_id->context = p;
458 p->state = IPOIB_CM_RX_LIVE;
459 p->jiffies = jiffies;
460 INIT_LIST_HEAD(&p->list);
461
462 p->qp = ipoib_cm_create_rx_qp(dev, p);
463 if (IS_ERR(p->qp)) {
464 ret = PTR_ERR(p->qp);
465 goto err_qp;
466 }
467
468 psn = prandom_u32() & 0xffffff;
469 ret = ipoib_cm_modify_rx_qp(dev, cm_id, p->qp, psn);
470 if (ret)
471 goto err_modify;
472
473 if (!ipoib_cm_has_srq(dev)) {
474 ret = ipoib_cm_nonsrq_init_rx(dev, cm_id, p);
475 if (ret)
476 goto err_modify;
477 }
478
479 spin_lock_irq(&priv->lock);
480 queue_delayed_work(priv->wq,
481 &priv->cm.stale_task, IPOIB_CM_RX_DELAY);
482 /* Add this entry to passive ids list head, but do not re-add it
483 * if IB_EVENT_QP_LAST_WQE_REACHED has moved it to flush list. */
484 p->jiffies = jiffies;
485 if (p->state == IPOIB_CM_RX_LIVE)
486 list_move(&p->list, &priv->cm.passive_ids);
487 spin_unlock_irq(&priv->lock);
488
489 ret = ipoib_cm_send_rep(dev, cm_id, p->qp, &event->param.req_rcvd, psn);
490 if (ret) {
491 ipoib_warn(priv, "failed to send REP: %d\n", ret);
492 if (ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE))
493 ipoib_warn(priv, "unable to move qp to error state\n");
494 }
495 return 0;
496
497 err_modify:
498 ib_destroy_qp(p->qp);
499 err_qp:
500 kfree(p);
501 return ret;
502 }
503
504 static int ipoib_cm_rx_handler(struct ib_cm_id *cm_id,
505 struct ib_cm_event *event)
506 {
507 struct ipoib_cm_rx *p;
508 struct ipoib_dev_priv *priv;
509
510 switch (event->event) {
511 case IB_CM_REQ_RECEIVED:
512 return ipoib_cm_req_handler(cm_id, event);
513 case IB_CM_DREQ_RECEIVED:
514 ib_send_cm_drep(cm_id, NULL, 0);
515 /* Fall through */
516 case IB_CM_REJ_RECEIVED:
517 p = cm_id->context;
518 priv = ipoib_priv(p->dev);
519 if (ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE))
520 ipoib_warn(priv, "unable to move qp to error state\n");
521 /* Fall through */
522 default:
523 return 0;
524 }
525 }
526 /* Adjust length of skb with fragments to match received data */
527 static void skb_put_frags(struct sk_buff *skb, unsigned int hdr_space,
528 unsigned int length, struct sk_buff *toskb)
529 {
530 int i, num_frags;
531 unsigned int size;
532
533 /* put header into skb */
534 size = min(length, hdr_space);
535 skb->tail += size;
536 skb->len += size;
537 length -= size;
538
539 num_frags = skb_shinfo(skb)->nr_frags;
540 for (i = 0; i < num_frags; i++) {
541 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
542
543 if (length == 0) {
544 /* don't need this page */
545 skb_fill_page_desc(toskb, i, skb_frag_page(frag),
546 0, PAGE_SIZE);
547 --skb_shinfo(skb)->nr_frags;
548 } else {
549 size = min(length, (unsigned) PAGE_SIZE);
550
551 skb_frag_size_set(frag, size);
552 skb->data_len += size;
553 skb->truesize += size;
554 skb->len += size;
555 length -= size;
556 }
557 }
558 }
559
560 void ipoib_cm_handle_rx_wc(struct net_device *dev, struct ib_wc *wc)
561 {
562 struct ipoib_dev_priv *priv = ipoib_priv(dev);
563 struct ipoib_cm_rx_buf *rx_ring;
564 unsigned int wr_id = wc->wr_id & ~(IPOIB_OP_CM | IPOIB_OP_RECV);
565 struct sk_buff *skb, *newskb;
566 struct ipoib_cm_rx *p;
567 unsigned long flags;
568 u64 mapping[IPOIB_CM_RX_SG];
569 int frags;
570 int has_srq;
571 struct sk_buff *small_skb;
572
573 ipoib_dbg_data(priv, "cm recv completion: id %d, status: %d\n",
574 wr_id, wc->status);
575
576 if (unlikely(wr_id >= ipoib_recvq_size)) {
577 if (wr_id == (IPOIB_CM_RX_DRAIN_WRID & ~(IPOIB_OP_CM | IPOIB_OP_RECV))) {
578 spin_lock_irqsave(&priv->lock, flags);
579 list_splice_init(&priv->cm.rx_drain_list, &priv->cm.rx_reap_list);
580 ipoib_cm_start_rx_drain(priv);
581 queue_work(priv->wq, &priv->cm.rx_reap_task);
582 spin_unlock_irqrestore(&priv->lock, flags);
583 } else
584 ipoib_warn(priv, "cm recv completion event with wrid %d (> %d)\n",
585 wr_id, ipoib_recvq_size);
586 return;
587 }
588
589 p = wc->qp->qp_context;
590
591 has_srq = ipoib_cm_has_srq(dev);
592 rx_ring = has_srq ? priv->cm.srq_ring : p->rx_ring;
593
594 skb = rx_ring[wr_id].skb;
595
596 if (unlikely(wc->status != IB_WC_SUCCESS)) {
597 ipoib_dbg(priv,
598 "cm recv error (status=%d, wrid=%d vend_err %#x)\n",
599 wc->status, wr_id, wc->vendor_err);
600 ++dev->stats.rx_dropped;
601 if (has_srq)
602 goto repost;
603 else {
604 if (!--p->recv_count) {
605 spin_lock_irqsave(&priv->lock, flags);
606 list_move(&p->list, &priv->cm.rx_reap_list);
607 spin_unlock_irqrestore(&priv->lock, flags);
608 queue_work(priv->wq, &priv->cm.rx_reap_task);
609 }
610 return;
611 }
612 }
613
614 if (unlikely(!(wr_id & IPOIB_CM_RX_UPDATE_MASK))) {
615 if (p && time_after_eq(jiffies, p->jiffies + IPOIB_CM_RX_UPDATE_TIME)) {
616 spin_lock_irqsave(&priv->lock, flags);
617 p->jiffies = jiffies;
618 /* Move this entry to list head, but do not re-add it
619 * if it has been moved out of list. */
620 if (p->state == IPOIB_CM_RX_LIVE)
621 list_move(&p->list, &priv->cm.passive_ids);
622 spin_unlock_irqrestore(&priv->lock, flags);
623 }
624 }
625
626 if (wc->byte_len < IPOIB_CM_COPYBREAK) {
627 int dlen = wc->byte_len;
628
629 small_skb = dev_alloc_skb(dlen + IPOIB_CM_RX_RESERVE);
630 if (small_skb) {
631 skb_reserve(small_skb, IPOIB_CM_RX_RESERVE);
632 ib_dma_sync_single_for_cpu(priv->ca, rx_ring[wr_id].mapping[0],
633 dlen, DMA_FROM_DEVICE);
634 skb_copy_from_linear_data(skb, small_skb->data, dlen);
635 ib_dma_sync_single_for_device(priv->ca, rx_ring[wr_id].mapping[0],
636 dlen, DMA_FROM_DEVICE);
637 skb_put(small_skb, dlen);
638 skb = small_skb;
639 goto copied;
640 }
641 }
642
643 frags = PAGE_ALIGN(wc->byte_len - min(wc->byte_len,
644 (unsigned)IPOIB_CM_HEAD_SIZE)) / PAGE_SIZE;
645
646 newskb = ipoib_cm_alloc_rx_skb(dev, rx_ring, wr_id, frags,
647 mapping, GFP_ATOMIC);
648 if (unlikely(!newskb)) {
649 /*
650 * If we can't allocate a new RX buffer, dump
651 * this packet and reuse the old buffer.
652 */
653 ipoib_dbg(priv, "failed to allocate receive buffer %d\n", wr_id);
654 ++dev->stats.rx_dropped;
655 goto repost;
656 }
657
658 ipoib_cm_dma_unmap_rx(priv, frags, rx_ring[wr_id].mapping);
659 memcpy(rx_ring[wr_id].mapping, mapping, (frags + 1) * sizeof *mapping);
660
661 ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n",
662 wc->byte_len, wc->slid);
663
664 skb_put_frags(skb, IPOIB_CM_HEAD_SIZE, wc->byte_len, newskb);
665
666 copied:
667 skb->protocol = ((struct ipoib_header *) skb->data)->proto;
668 skb_add_pseudo_hdr(skb);
669
670 ++dev->stats.rx_packets;
671 dev->stats.rx_bytes += skb->len;
672
673 skb->dev = dev;
674 /* XXX get correct PACKET_ type here */
675 skb->pkt_type = PACKET_HOST;
676 netif_receive_skb(skb);
677
678 repost:
679 if (has_srq) {
680 if (unlikely(ipoib_cm_post_receive_srq(dev, wr_id)))
681 ipoib_warn(priv, "ipoib_cm_post_receive_srq failed "
682 "for buf %d\n", wr_id);
683 } else {
684 if (unlikely(ipoib_cm_post_receive_nonsrq(dev, p,
685 &priv->cm.rx_wr,
686 priv->cm.rx_sge,
687 wr_id))) {
688 --p->recv_count;
689 ipoib_warn(priv, "ipoib_cm_post_receive_nonsrq failed "
690 "for buf %d\n", wr_id);
691 }
692 }
693 }
694
695 static inline int post_send(struct ipoib_dev_priv *priv,
696 struct ipoib_cm_tx *tx,
697 unsigned int wr_id,
698 struct ipoib_tx_buf *tx_req)
699 {
700 struct ib_send_wr *bad_wr;
701
702 ipoib_build_sge(priv, tx_req);
703
704 priv->tx_wr.wr.wr_id = wr_id | IPOIB_OP_CM;
705
706 return ib_post_send(tx->qp, &priv->tx_wr.wr, &bad_wr);
707 }
708
709 void ipoib_cm_send(struct net_device *dev, struct sk_buff *skb, struct ipoib_cm_tx *tx)
710 {
711 struct ipoib_dev_priv *priv = ipoib_priv(dev);
712 struct ipoib_tx_buf *tx_req;
713 int rc;
714 unsigned usable_sge = tx->max_send_sge - !!skb_headlen(skb);
715
716 if (unlikely(skb->len > tx->mtu)) {
717 ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n",
718 skb->len, tx->mtu);
719 ++dev->stats.tx_dropped;
720 ++dev->stats.tx_errors;
721 ipoib_cm_skb_too_long(dev, skb, tx->mtu - IPOIB_ENCAP_LEN);
722 return;
723 }
724 if (skb_shinfo(skb)->nr_frags > usable_sge) {
725 if (skb_linearize(skb) < 0) {
726 ipoib_warn(priv, "skb could not be linearized\n");
727 ++dev->stats.tx_dropped;
728 ++dev->stats.tx_errors;
729 dev_kfree_skb_any(skb);
730 return;
731 }
732 /* Does skb_linearize return ok without reducing nr_frags? */
733 if (skb_shinfo(skb)->nr_frags > usable_sge) {
734 ipoib_warn(priv, "too many frags after skb linearize\n");
735 ++dev->stats.tx_dropped;
736 ++dev->stats.tx_errors;
737 dev_kfree_skb_any(skb);
738 return;
739 }
740 }
741 ipoib_dbg_data(priv, "sending packet: head 0x%x length %d connection 0x%x\n",
742 tx->tx_head, skb->len, tx->qp->qp_num);
743
744 /*
745 * We put the skb into the tx_ring _before_ we call post_send()
746 * because it's entirely possible that the completion handler will
747 * run before we execute anything after the post_send(). That
748 * means we have to make sure everything is properly recorded and
749 * our state is consistent before we call post_send().
750 */
751 tx_req = &tx->tx_ring[tx->tx_head & (ipoib_sendq_size - 1)];
752 tx_req->skb = skb;
753
754 if (unlikely(ipoib_dma_map_tx(priv->ca, tx_req))) {
755 ++dev->stats.tx_errors;
756 dev_kfree_skb_any(skb);
757 return;
758 }
759
760 if ((priv->tx_head - priv->tx_tail) == ipoib_sendq_size - 1) {
761 ipoib_dbg(priv, "TX ring 0x%x full, stopping kernel net queue\n",
762 tx->qp->qp_num);
763 netif_stop_queue(dev);
764 }
765
766 skb_orphan(skb);
767 skb_dst_drop(skb);
768
769 if (netif_queue_stopped(dev)) {
770 rc = ib_req_notify_cq(priv->send_cq, IB_CQ_NEXT_COMP |
771 IB_CQ_REPORT_MISSED_EVENTS);
772 if (unlikely(rc < 0))
773 ipoib_warn(priv, "IPoIB/CM:request notify on send CQ failed\n");
774 else if (rc)
775 napi_schedule(&priv->send_napi);
776 }
777
778 rc = post_send(priv, tx, tx->tx_head & (ipoib_sendq_size - 1), tx_req);
779 if (unlikely(rc)) {
780 ipoib_warn(priv, "IPoIB/CM:post_send failed, error %d\n", rc);
781 ++dev->stats.tx_errors;
782 ipoib_dma_unmap_tx(priv, tx_req);
783 dev_kfree_skb_any(skb);
784
785 if (netif_queue_stopped(dev))
786 netif_wake_queue(dev);
787 } else {
788 netif_trans_update(dev);
789 ++tx->tx_head;
790 ++priv->tx_head;
791 }
792 }
793
794 void ipoib_cm_handle_tx_wc(struct net_device *dev, struct ib_wc *wc)
795 {
796 struct ipoib_dev_priv *priv = ipoib_priv(dev);
797 struct ipoib_cm_tx *tx = wc->qp->qp_context;
798 unsigned int wr_id = wc->wr_id & ~IPOIB_OP_CM;
799 struct ipoib_tx_buf *tx_req;
800 unsigned long flags;
801
802 ipoib_dbg_data(priv, "cm send completion: id %d, status: %d\n",
803 wr_id, wc->status);
804
805 if (unlikely(wr_id >= ipoib_sendq_size)) {
806 ipoib_warn(priv, "cm send completion event with wrid %d (> %d)\n",
807 wr_id, ipoib_sendq_size);
808 return;
809 }
810
811 tx_req = &tx->tx_ring[wr_id];
812
813 ipoib_dma_unmap_tx(priv, tx_req);
814
815 /* FIXME: is this right? Shouldn't we only increment on success? */
816 ++dev->stats.tx_packets;
817 dev->stats.tx_bytes += tx_req->skb->len;
818
819 dev_kfree_skb_any(tx_req->skb);
820
821 netif_tx_lock(dev);
822
823 ++tx->tx_tail;
824 ++priv->tx_tail;
825
826 if (unlikely(netif_queue_stopped(dev) &&
827 (priv->tx_head - priv->tx_tail) <= ipoib_sendq_size >> 1 &&
828 test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)))
829 netif_wake_queue(dev);
830
831 if (wc->status != IB_WC_SUCCESS &&
832 wc->status != IB_WC_WR_FLUSH_ERR) {
833 struct ipoib_neigh *neigh;
834
835 /* IB_WC[_RNR]_RETRY_EXC_ERR error is part of the life cycle,
836 * so don't make waves.
837 */
838 if (wc->status == IB_WC_RNR_RETRY_EXC_ERR ||
839 wc->status == IB_WC_RETRY_EXC_ERR)
840 ipoib_dbg(priv,
841 "%s: failed cm send event (status=%d, wrid=%d vend_err %#x)\n",
842 __func__, wc->status, wr_id, wc->vendor_err);
843 else
844 ipoib_warn(priv,
845 "%s: failed cm send event (status=%d, wrid=%d vend_err %#x)\n",
846 __func__, wc->status, wr_id, wc->vendor_err);
847
848 spin_lock_irqsave(&priv->lock, flags);
849 neigh = tx->neigh;
850
851 if (neigh) {
852 neigh->cm = NULL;
853 ipoib_neigh_free(neigh);
854
855 tx->neigh = NULL;
856 }
857
858 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
859 list_move(&tx->list, &priv->cm.reap_list);
860 queue_work(priv->wq, &priv->cm.reap_task);
861 }
862
863 clear_bit(IPOIB_FLAG_OPER_UP, &tx->flags);
864
865 spin_unlock_irqrestore(&priv->lock, flags);
866 }
867
868 netif_tx_unlock(dev);
869 }
870
871 int ipoib_cm_dev_open(struct net_device *dev)
872 {
873 struct ipoib_dev_priv *priv = ipoib_priv(dev);
874 int ret;
875
876 if (!IPOIB_CM_SUPPORTED(dev->dev_addr))
877 return 0;
878
879 priv->cm.id = ib_create_cm_id(priv->ca, ipoib_cm_rx_handler, dev);
880 if (IS_ERR(priv->cm.id)) {
881 pr_warn("%s: failed to create CM ID\n", priv->ca->name);
882 ret = PTR_ERR(priv->cm.id);
883 goto err_cm;
884 }
885
886 ret = ib_cm_listen(priv->cm.id, cpu_to_be64(IPOIB_CM_IETF_ID | priv->qp->qp_num),
887 0);
888 if (ret) {
889 pr_warn("%s: failed to listen on ID 0x%llx\n", priv->ca->name,
890 IPOIB_CM_IETF_ID | priv->qp->qp_num);
891 goto err_listen;
892 }
893
894 return 0;
895
896 err_listen:
897 ib_destroy_cm_id(priv->cm.id);
898 err_cm:
899 priv->cm.id = NULL;
900 return ret;
901 }
902
903 static void ipoib_cm_free_rx_reap_list(struct net_device *dev)
904 {
905 struct ipoib_dev_priv *priv = ipoib_priv(dev);
906 struct ipoib_cm_rx *rx, *n;
907 LIST_HEAD(list);
908
909 spin_lock_irq(&priv->lock);
910 list_splice_init(&priv->cm.rx_reap_list, &list);
911 spin_unlock_irq(&priv->lock);
912
913 list_for_each_entry_safe(rx, n, &list, list) {
914 ib_destroy_cm_id(rx->id);
915 ib_destroy_qp(rx->qp);
916 if (!ipoib_cm_has_srq(dev)) {
917 ipoib_cm_free_rx_ring(priv->dev, rx->rx_ring);
918 spin_lock_irq(&priv->lock);
919 --priv->cm.nonsrq_conn_qp;
920 spin_unlock_irq(&priv->lock);
921 }
922 kfree(rx);
923 }
924 }
925
926 void ipoib_cm_dev_stop(struct net_device *dev)
927 {
928 struct ipoib_dev_priv *priv = ipoib_priv(dev);
929 struct ipoib_cm_rx *p;
930 unsigned long begin;
931 int ret;
932
933 if (!IPOIB_CM_SUPPORTED(dev->dev_addr) || !priv->cm.id)
934 return;
935
936 ib_destroy_cm_id(priv->cm.id);
937 priv->cm.id = NULL;
938
939 spin_lock_irq(&priv->lock);
940 while (!list_empty(&priv->cm.passive_ids)) {
941 p = list_entry(priv->cm.passive_ids.next, typeof(*p), list);
942 list_move(&p->list, &priv->cm.rx_error_list);
943 p->state = IPOIB_CM_RX_ERROR;
944 spin_unlock_irq(&priv->lock);
945 ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE);
946 if (ret)
947 ipoib_warn(priv, "unable to move qp to error state: %d\n", ret);
948 spin_lock_irq(&priv->lock);
949 }
950
951 /* Wait for all RX to be drained */
952 begin = jiffies;
953
954 while (!list_empty(&priv->cm.rx_error_list) ||
955 !list_empty(&priv->cm.rx_flush_list) ||
956 !list_empty(&priv->cm.rx_drain_list)) {
957 if (time_after(jiffies, begin + 5 * HZ)) {
958 ipoib_warn(priv, "RX drain timing out\n");
959
960 /*
961 * assume the HW is wedged and just free up everything.
962 */
963 list_splice_init(&priv->cm.rx_flush_list,
964 &priv->cm.rx_reap_list);
965 list_splice_init(&priv->cm.rx_error_list,
966 &priv->cm.rx_reap_list);
967 list_splice_init(&priv->cm.rx_drain_list,
968 &priv->cm.rx_reap_list);
969 break;
970 }
971 spin_unlock_irq(&priv->lock);
972 usleep_range(1000, 2000);
973 ipoib_drain_cq(dev);
974 spin_lock_irq(&priv->lock);
975 }
976
977 spin_unlock_irq(&priv->lock);
978
979 ipoib_cm_free_rx_reap_list(dev);
980
981 cancel_delayed_work(&priv->cm.stale_task);
982 }
983
984 static int ipoib_cm_rep_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
985 {
986 struct ipoib_cm_tx *p = cm_id->context;
987 struct ipoib_dev_priv *priv = ipoib_priv(p->dev);
988 struct ipoib_cm_data *data = event->private_data;
989 struct sk_buff_head skqueue;
990 struct ib_qp_attr qp_attr;
991 int qp_attr_mask, ret;
992 struct sk_buff *skb;
993
994 p->mtu = be32_to_cpu(data->mtu);
995
996 if (p->mtu <= IPOIB_ENCAP_LEN) {
997 ipoib_warn(priv, "Rejecting connection: mtu %d <= %d\n",
998 p->mtu, IPOIB_ENCAP_LEN);
999 return -EINVAL;
1000 }
1001
1002 qp_attr.qp_state = IB_QPS_RTR;
1003 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
1004 if (ret) {
1005 ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret);
1006 return ret;
1007 }
1008
1009 qp_attr.rq_psn = 0 /* FIXME */;
1010 ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask);
1011 if (ret) {
1012 ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret);
1013 return ret;
1014 }
1015
1016 qp_attr.qp_state = IB_QPS_RTS;
1017 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
1018 if (ret) {
1019 ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret);
1020 return ret;
1021 }
1022 ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask);
1023 if (ret) {
1024 ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret);
1025 return ret;
1026 }
1027
1028 skb_queue_head_init(&skqueue);
1029
1030 spin_lock_irq(&priv->lock);
1031 set_bit(IPOIB_FLAG_OPER_UP, &p->flags);
1032 if (p->neigh)
1033 while ((skb = __skb_dequeue(&p->neigh->queue)))
1034 __skb_queue_tail(&skqueue, skb);
1035 spin_unlock_irq(&priv->lock);
1036
1037 while ((skb = __skb_dequeue(&skqueue))) {
1038 skb->dev = p->dev;
1039 ret = dev_queue_xmit(skb);
1040 if (ret)
1041 ipoib_warn(priv, "%s:dev_queue_xmit failed to re-queue packet, ret:%d\n",
1042 __func__, ret);
1043 }
1044
1045 ret = ib_send_cm_rtu(cm_id, NULL, 0);
1046 if (ret) {
1047 ipoib_warn(priv, "failed to send RTU: %d\n", ret);
1048 return ret;
1049 }
1050 return 0;
1051 }
1052
1053 static struct ib_qp *ipoib_cm_create_tx_qp(struct net_device *dev, struct ipoib_cm_tx *tx)
1054 {
1055 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1056 struct ib_qp_init_attr attr = {
1057 .send_cq = priv->send_cq,
1058 .recv_cq = priv->recv_cq,
1059 .srq = priv->cm.srq,
1060 .cap.max_send_wr = ipoib_sendq_size,
1061 .cap.max_send_sge = 1,
1062 .sq_sig_type = IB_SIGNAL_ALL_WR,
1063 .qp_type = IB_QPT_RC,
1064 .qp_context = tx,
1065 .create_flags = 0
1066 };
1067 struct ib_qp *tx_qp;
1068
1069 if (dev->features & NETIF_F_SG)
1070 attr.cap.max_send_sge =
1071 min_t(u32, priv->ca->attrs.max_sge, MAX_SKB_FRAGS + 1);
1072
1073 tx_qp = ib_create_qp(priv->pd, &attr);
1074 tx->max_send_sge = attr.cap.max_send_sge;
1075 return tx_qp;
1076 }
1077
1078 static int ipoib_cm_send_req(struct net_device *dev,
1079 struct ib_cm_id *id, struct ib_qp *qp,
1080 u32 qpn,
1081 struct sa_path_rec *pathrec)
1082 {
1083 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1084 struct ipoib_cm_data data = {};
1085 struct ib_cm_req_param req = {};
1086
1087 data.qpn = cpu_to_be32(priv->qp->qp_num);
1088 data.mtu = cpu_to_be32(IPOIB_CM_BUF_SIZE);
1089
1090 req.primary_path = pathrec;
1091 req.alternate_path = NULL;
1092 req.service_id = cpu_to_be64(IPOIB_CM_IETF_ID | qpn);
1093 req.qp_num = qp->qp_num;
1094 req.qp_type = qp->qp_type;
1095 req.private_data = &data;
1096 req.private_data_len = sizeof data;
1097 req.flow_control = 0;
1098
1099 req.starting_psn = 0; /* FIXME */
1100
1101 /*
1102 * Pick some arbitrary defaults here; we could make these
1103 * module parameters if anyone cared about setting them.
1104 */
1105 req.responder_resources = 4;
1106 req.remote_cm_response_timeout = 20;
1107 req.local_cm_response_timeout = 20;
1108 req.retry_count = 0; /* RFC draft warns against retries */
1109 req.rnr_retry_count = 0; /* RFC draft warns against retries */
1110 req.max_cm_retries = 15;
1111 req.srq = ipoib_cm_has_srq(dev);
1112 return ib_send_cm_req(id, &req);
1113 }
1114
1115 static int ipoib_cm_modify_tx_init(struct net_device *dev,
1116 struct ib_cm_id *cm_id, struct ib_qp *qp)
1117 {
1118 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1119 struct ib_qp_attr qp_attr;
1120 int qp_attr_mask, ret;
1121 ret = ib_find_pkey(priv->ca, priv->port, priv->pkey, &qp_attr.pkey_index);
1122 if (ret) {
1123 ipoib_warn(priv, "pkey 0x%x not found: %d\n", priv->pkey, ret);
1124 return ret;
1125 }
1126
1127 qp_attr.qp_state = IB_QPS_INIT;
1128 qp_attr.qp_access_flags = IB_ACCESS_LOCAL_WRITE;
1129 qp_attr.port_num = priv->port;
1130 qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS | IB_QP_PKEY_INDEX | IB_QP_PORT;
1131
1132 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
1133 if (ret) {
1134 ipoib_warn(priv, "failed to modify tx QP to INIT: %d\n", ret);
1135 return ret;
1136 }
1137 return 0;
1138 }
1139
1140 static int ipoib_cm_tx_init(struct ipoib_cm_tx *p, u32 qpn,
1141 struct sa_path_rec *pathrec)
1142 {
1143 struct ipoib_dev_priv *priv = ipoib_priv(p->dev);
1144 unsigned int noio_flag;
1145 int ret;
1146
1147 noio_flag = memalloc_noio_save();
1148 p->tx_ring = vzalloc(ipoib_sendq_size * sizeof(*p->tx_ring));
1149 if (!p->tx_ring) {
1150 memalloc_noio_restore(noio_flag);
1151 ret = -ENOMEM;
1152 goto err_tx;
1153 }
1154 memset(p->tx_ring, 0, ipoib_sendq_size * sizeof *p->tx_ring);
1155
1156 p->qp = ipoib_cm_create_tx_qp(p->dev, p);
1157 memalloc_noio_restore(noio_flag);
1158 if (IS_ERR(p->qp)) {
1159 ret = PTR_ERR(p->qp);
1160 ipoib_warn(priv, "failed to create tx qp: %d\n", ret);
1161 goto err_qp;
1162 }
1163
1164 p->id = ib_create_cm_id(priv->ca, ipoib_cm_tx_handler, p);
1165 if (IS_ERR(p->id)) {
1166 ret = PTR_ERR(p->id);
1167 ipoib_warn(priv, "failed to create tx cm id: %d\n", ret);
1168 goto err_id;
1169 }
1170
1171 ret = ipoib_cm_modify_tx_init(p->dev, p->id, p->qp);
1172 if (ret) {
1173 ipoib_warn(priv, "failed to modify tx qp to rtr: %d\n", ret);
1174 goto err_modify_send;
1175 }
1176
1177 ret = ipoib_cm_send_req(p->dev, p->id, p->qp, qpn, pathrec);
1178 if (ret) {
1179 ipoib_warn(priv, "failed to send cm req: %d\n", ret);
1180 goto err_modify_send;
1181 }
1182
1183 ipoib_dbg(priv, "Request connection 0x%x for gid %pI6 qpn 0x%x\n",
1184 p->qp->qp_num, pathrec->dgid.raw, qpn);
1185
1186 return 0;
1187
1188 err_modify_send:
1189 ib_destroy_cm_id(p->id);
1190 err_id:
1191 p->id = NULL;
1192 ib_destroy_qp(p->qp);
1193 err_qp:
1194 p->qp = NULL;
1195 vfree(p->tx_ring);
1196 err_tx:
1197 return ret;
1198 }
1199
1200 static void ipoib_cm_tx_destroy(struct ipoib_cm_tx *p)
1201 {
1202 struct ipoib_dev_priv *priv = ipoib_priv(p->dev);
1203 struct ipoib_tx_buf *tx_req;
1204 unsigned long begin;
1205
1206 ipoib_dbg(priv, "Destroy active connection 0x%x head 0x%x tail 0x%x\n",
1207 p->qp ? p->qp->qp_num : 0, p->tx_head, p->tx_tail);
1208
1209 if (p->id)
1210 ib_destroy_cm_id(p->id);
1211
1212 if (p->tx_ring) {
1213 /* Wait for all sends to complete */
1214 begin = jiffies;
1215 while ((int) p->tx_tail - (int) p->tx_head < 0) {
1216 if (time_after(jiffies, begin + 5 * HZ)) {
1217 ipoib_warn(priv, "timing out; %d sends not completed\n",
1218 p->tx_head - p->tx_tail);
1219 goto timeout;
1220 }
1221
1222 usleep_range(1000, 2000);
1223 }
1224 }
1225
1226 timeout:
1227
1228 while ((int) p->tx_tail - (int) p->tx_head < 0) {
1229 tx_req = &p->tx_ring[p->tx_tail & (ipoib_sendq_size - 1)];
1230 ipoib_dma_unmap_tx(priv, tx_req);
1231 dev_kfree_skb_any(tx_req->skb);
1232 netif_tx_lock_bh(p->dev);
1233 ++p->tx_tail;
1234 ++priv->tx_tail;
1235 if (unlikely(priv->tx_head - priv->tx_tail == ipoib_sendq_size >> 1) &&
1236 netif_queue_stopped(p->dev) &&
1237 test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
1238 netif_wake_queue(p->dev);
1239 netif_tx_unlock_bh(p->dev);
1240 }
1241
1242 if (p->qp)
1243 ib_destroy_qp(p->qp);
1244
1245 vfree(p->tx_ring);
1246 kfree(p);
1247 }
1248
1249 static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id,
1250 struct ib_cm_event *event)
1251 {
1252 struct ipoib_cm_tx *tx = cm_id->context;
1253 struct ipoib_dev_priv *priv = ipoib_priv(tx->dev);
1254 struct net_device *dev = priv->dev;
1255 struct ipoib_neigh *neigh;
1256 unsigned long flags;
1257 int ret;
1258
1259 switch (event->event) {
1260 case IB_CM_DREQ_RECEIVED:
1261 ipoib_dbg(priv, "DREQ received.\n");
1262 ib_send_cm_drep(cm_id, NULL, 0);
1263 break;
1264 case IB_CM_REP_RECEIVED:
1265 ipoib_dbg(priv, "REP received.\n");
1266 ret = ipoib_cm_rep_handler(cm_id, event);
1267 if (ret)
1268 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
1269 NULL, 0, NULL, 0);
1270 break;
1271 case IB_CM_REQ_ERROR:
1272 case IB_CM_REJ_RECEIVED:
1273 case IB_CM_TIMEWAIT_EXIT:
1274 ipoib_dbg(priv, "CM error %d.\n", event->event);
1275 netif_tx_lock_bh(dev);
1276 spin_lock_irqsave(&priv->lock, flags);
1277 neigh = tx->neigh;
1278
1279 if (neigh) {
1280 neigh->cm = NULL;
1281 ipoib_neigh_free(neigh);
1282
1283 tx->neigh = NULL;
1284 }
1285
1286 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
1287 list_move(&tx->list, &priv->cm.reap_list);
1288 queue_work(priv->wq, &priv->cm.reap_task);
1289 }
1290
1291 spin_unlock_irqrestore(&priv->lock, flags);
1292 netif_tx_unlock_bh(dev);
1293 break;
1294 default:
1295 break;
1296 }
1297
1298 return 0;
1299 }
1300
1301 struct ipoib_cm_tx *ipoib_cm_create_tx(struct net_device *dev, struct ipoib_path *path,
1302 struct ipoib_neigh *neigh)
1303 {
1304 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1305 struct ipoib_cm_tx *tx;
1306
1307 tx = kzalloc(sizeof *tx, GFP_ATOMIC);
1308 if (!tx)
1309 return NULL;
1310
1311 neigh->cm = tx;
1312 tx->neigh = neigh;
1313 tx->path = path;
1314 tx->dev = dev;
1315 list_add(&tx->list, &priv->cm.start_list);
1316 set_bit(IPOIB_FLAG_INITIALIZED, &tx->flags);
1317 queue_work(priv->wq, &priv->cm.start_task);
1318 return tx;
1319 }
1320
1321 void ipoib_cm_destroy_tx(struct ipoib_cm_tx *tx)
1322 {
1323 struct ipoib_dev_priv *priv = ipoib_priv(tx->dev);
1324 unsigned long flags;
1325 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
1326 spin_lock_irqsave(&priv->lock, flags);
1327 list_move(&tx->list, &priv->cm.reap_list);
1328 queue_work(priv->wq, &priv->cm.reap_task);
1329 ipoib_dbg(priv, "Reap connection for gid %pI6\n",
1330 tx->neigh->daddr + 4);
1331 tx->neigh = NULL;
1332 spin_unlock_irqrestore(&priv->lock, flags);
1333 }
1334 }
1335
1336 #define QPN_AND_OPTIONS_OFFSET 4
1337
1338 static void ipoib_cm_tx_start(struct work_struct *work)
1339 {
1340 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1341 cm.start_task);
1342 struct net_device *dev = priv->dev;
1343 struct ipoib_neigh *neigh;
1344 struct ipoib_cm_tx *p;
1345 unsigned long flags;
1346 struct ipoib_path *path;
1347 int ret;
1348
1349 struct sa_path_rec pathrec;
1350 u32 qpn;
1351
1352 netif_tx_lock_bh(dev);
1353 spin_lock_irqsave(&priv->lock, flags);
1354
1355 while (!list_empty(&priv->cm.start_list)) {
1356 p = list_entry(priv->cm.start_list.next, typeof(*p), list);
1357 list_del_init(&p->list);
1358 neigh = p->neigh;
1359
1360 qpn = IPOIB_QPN(neigh->daddr);
1361 /*
1362 * As long as the search is with these 2 locks,
1363 * path existence indicates its validity.
1364 */
1365 path = __path_find(dev, neigh->daddr + QPN_AND_OPTIONS_OFFSET);
1366 if (!path) {
1367 pr_info("%s ignore not valid path %pI6\n",
1368 __func__,
1369 neigh->daddr + QPN_AND_OPTIONS_OFFSET);
1370 goto free_neigh;
1371 }
1372 memcpy(&pathrec, &p->path->pathrec, sizeof pathrec);
1373
1374 spin_unlock_irqrestore(&priv->lock, flags);
1375 netif_tx_unlock_bh(dev);
1376
1377 ret = ipoib_cm_tx_init(p, qpn, &pathrec);
1378
1379 netif_tx_lock_bh(dev);
1380 spin_lock_irqsave(&priv->lock, flags);
1381
1382 if (ret) {
1383 free_neigh:
1384 neigh = p->neigh;
1385 if (neigh) {
1386 neigh->cm = NULL;
1387 ipoib_neigh_free(neigh);
1388 }
1389 list_del(&p->list);
1390 kfree(p);
1391 }
1392 }
1393
1394 spin_unlock_irqrestore(&priv->lock, flags);
1395 netif_tx_unlock_bh(dev);
1396 }
1397
1398 static void ipoib_cm_tx_reap(struct work_struct *work)
1399 {
1400 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1401 cm.reap_task);
1402 struct net_device *dev = priv->dev;
1403 struct ipoib_cm_tx *p;
1404 unsigned long flags;
1405
1406 netif_tx_lock_bh(dev);
1407 spin_lock_irqsave(&priv->lock, flags);
1408
1409 while (!list_empty(&priv->cm.reap_list)) {
1410 p = list_entry(priv->cm.reap_list.next, typeof(*p), list);
1411 list_del_init(&p->list);
1412 spin_unlock_irqrestore(&priv->lock, flags);
1413 netif_tx_unlock_bh(dev);
1414 ipoib_cm_tx_destroy(p);
1415 netif_tx_lock_bh(dev);
1416 spin_lock_irqsave(&priv->lock, flags);
1417 }
1418
1419 spin_unlock_irqrestore(&priv->lock, flags);
1420 netif_tx_unlock_bh(dev);
1421 }
1422
1423 static void ipoib_cm_skb_reap(struct work_struct *work)
1424 {
1425 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1426 cm.skb_task);
1427 struct net_device *dev = priv->dev;
1428 struct sk_buff *skb;
1429 unsigned long flags;
1430 unsigned mtu = priv->mcast_mtu;
1431
1432 netif_tx_lock_bh(dev);
1433 spin_lock_irqsave(&priv->lock, flags);
1434
1435 while ((skb = skb_dequeue(&priv->cm.skb_queue))) {
1436 spin_unlock_irqrestore(&priv->lock, flags);
1437 netif_tx_unlock_bh(dev);
1438
1439 if (skb->protocol == htons(ETH_P_IP))
1440 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu));
1441 #if IS_ENABLED(CONFIG_IPV6)
1442 else if (skb->protocol == htons(ETH_P_IPV6))
1443 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1444 #endif
1445 dev_kfree_skb_any(skb);
1446
1447 netif_tx_lock_bh(dev);
1448 spin_lock_irqsave(&priv->lock, flags);
1449 }
1450
1451 spin_unlock_irqrestore(&priv->lock, flags);
1452 netif_tx_unlock_bh(dev);
1453 }
1454
1455 void ipoib_cm_skb_too_long(struct net_device *dev, struct sk_buff *skb,
1456 unsigned int mtu)
1457 {
1458 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1459 int e = skb_queue_empty(&priv->cm.skb_queue);
1460
1461 skb_dst_update_pmtu(skb, mtu);
1462
1463 skb_queue_tail(&priv->cm.skb_queue, skb);
1464 if (e)
1465 queue_work(priv->wq, &priv->cm.skb_task);
1466 }
1467
1468 static void ipoib_cm_rx_reap(struct work_struct *work)
1469 {
1470 ipoib_cm_free_rx_reap_list(container_of(work, struct ipoib_dev_priv,
1471 cm.rx_reap_task)->dev);
1472 }
1473
1474 static void ipoib_cm_stale_task(struct work_struct *work)
1475 {
1476 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1477 cm.stale_task.work);
1478 struct ipoib_cm_rx *p;
1479 int ret;
1480
1481 spin_lock_irq(&priv->lock);
1482 while (!list_empty(&priv->cm.passive_ids)) {
1483 /* List is sorted by LRU, start from tail,
1484 * stop when we see a recently used entry */
1485 p = list_entry(priv->cm.passive_ids.prev, typeof(*p), list);
1486 if (time_before_eq(jiffies, p->jiffies + IPOIB_CM_RX_TIMEOUT))
1487 break;
1488 list_move(&p->list, &priv->cm.rx_error_list);
1489 p->state = IPOIB_CM_RX_ERROR;
1490 spin_unlock_irq(&priv->lock);
1491 ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE);
1492 if (ret)
1493 ipoib_warn(priv, "unable to move qp to error state: %d\n", ret);
1494 spin_lock_irq(&priv->lock);
1495 }
1496
1497 if (!list_empty(&priv->cm.passive_ids))
1498 queue_delayed_work(priv->wq,
1499 &priv->cm.stale_task, IPOIB_CM_RX_DELAY);
1500 spin_unlock_irq(&priv->lock);
1501 }
1502
1503 static ssize_t show_mode(struct device *d, struct device_attribute *attr,
1504 char *buf)
1505 {
1506 struct net_device *dev = to_net_dev(d);
1507 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1508
1509 if (test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags))
1510 return sprintf(buf, "connected\n");
1511 else
1512 return sprintf(buf, "datagram\n");
1513 }
1514
1515 static ssize_t set_mode(struct device *d, struct device_attribute *attr,
1516 const char *buf, size_t count)
1517 {
1518 struct net_device *dev = to_net_dev(d);
1519 int ret;
1520 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1521
1522 if (test_bit(IPOIB_FLAG_GOING_DOWN, &priv->flags))
1523 return -EPERM;
1524
1525 if (!mutex_trylock(&priv->sysfs_mutex))
1526 return restart_syscall();
1527
1528 if (!rtnl_trylock()) {
1529 mutex_unlock(&priv->sysfs_mutex);
1530 return restart_syscall();
1531 }
1532
1533 ret = ipoib_set_mode(dev, buf);
1534
1535 /* The assumption is that the function ipoib_set_mode returned
1536 * with the rtnl held by it, if not the value -EBUSY returned,
1537 * then no need to rtnl_unlock
1538 */
1539 if (ret != -EBUSY)
1540 rtnl_unlock();
1541 mutex_unlock(&priv->sysfs_mutex);
1542
1543 return (!ret || ret == -EBUSY) ? count : ret;
1544 }
1545
1546 static DEVICE_ATTR(mode, S_IWUSR | S_IRUGO, show_mode, set_mode);
1547
1548 int ipoib_cm_add_mode_attr(struct net_device *dev)
1549 {
1550 return device_create_file(&dev->dev, &dev_attr_mode);
1551 }
1552
1553 static void ipoib_cm_create_srq(struct net_device *dev, int max_sge)
1554 {
1555 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1556 struct ib_srq_init_attr srq_init_attr = {
1557 .srq_type = IB_SRQT_BASIC,
1558 .attr = {
1559 .max_wr = ipoib_recvq_size,
1560 .max_sge = max_sge
1561 }
1562 };
1563
1564 priv->cm.srq = ib_create_srq(priv->pd, &srq_init_attr);
1565 if (IS_ERR(priv->cm.srq)) {
1566 if (PTR_ERR(priv->cm.srq) != -ENOSYS)
1567 pr_warn("%s: failed to allocate SRQ, error %ld\n",
1568 priv->ca->name, PTR_ERR(priv->cm.srq));
1569 priv->cm.srq = NULL;
1570 return;
1571 }
1572
1573 priv->cm.srq_ring = vzalloc(ipoib_recvq_size * sizeof *priv->cm.srq_ring);
1574 if (!priv->cm.srq_ring) {
1575 ib_destroy_srq(priv->cm.srq);
1576 priv->cm.srq = NULL;
1577 return;
1578 }
1579
1580 }
1581
1582 int ipoib_cm_dev_init(struct net_device *dev)
1583 {
1584 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1585 int max_srq_sge, i;
1586
1587 INIT_LIST_HEAD(&priv->cm.passive_ids);
1588 INIT_LIST_HEAD(&priv->cm.reap_list);
1589 INIT_LIST_HEAD(&priv->cm.start_list);
1590 INIT_LIST_HEAD(&priv->cm.rx_error_list);
1591 INIT_LIST_HEAD(&priv->cm.rx_flush_list);
1592 INIT_LIST_HEAD(&priv->cm.rx_drain_list);
1593 INIT_LIST_HEAD(&priv->cm.rx_reap_list);
1594 INIT_WORK(&priv->cm.start_task, ipoib_cm_tx_start);
1595 INIT_WORK(&priv->cm.reap_task, ipoib_cm_tx_reap);
1596 INIT_WORK(&priv->cm.skb_task, ipoib_cm_skb_reap);
1597 INIT_WORK(&priv->cm.rx_reap_task, ipoib_cm_rx_reap);
1598 INIT_DELAYED_WORK(&priv->cm.stale_task, ipoib_cm_stale_task);
1599
1600 skb_queue_head_init(&priv->cm.skb_queue);
1601
1602 ipoib_dbg(priv, "max_srq_sge=%d\n", priv->ca->attrs.max_srq_sge);
1603
1604 max_srq_sge = min_t(int, IPOIB_CM_RX_SG, priv->ca->attrs.max_srq_sge);
1605 ipoib_cm_create_srq(dev, max_srq_sge);
1606 if (ipoib_cm_has_srq(dev)) {
1607 priv->cm.max_cm_mtu = max_srq_sge * PAGE_SIZE - 0x10;
1608 priv->cm.num_frags = max_srq_sge;
1609 ipoib_dbg(priv, "max_cm_mtu = 0x%x, num_frags=%d\n",
1610 priv->cm.max_cm_mtu, priv->cm.num_frags);
1611 } else {
1612 priv->cm.max_cm_mtu = IPOIB_CM_MTU;
1613 priv->cm.num_frags = IPOIB_CM_RX_SG;
1614 }
1615
1616 ipoib_cm_init_rx_wr(dev, &priv->cm.rx_wr, priv->cm.rx_sge);
1617
1618 if (ipoib_cm_has_srq(dev)) {
1619 for (i = 0; i < ipoib_recvq_size; ++i) {
1620 if (!ipoib_cm_alloc_rx_skb(dev, priv->cm.srq_ring, i,
1621 priv->cm.num_frags - 1,
1622 priv->cm.srq_ring[i].mapping,
1623 GFP_KERNEL)) {
1624 ipoib_warn(priv, "failed to allocate "
1625 "receive buffer %d\n", i);
1626 ipoib_cm_dev_cleanup(dev);
1627 return -ENOMEM;
1628 }
1629
1630 if (ipoib_cm_post_receive_srq(dev, i)) {
1631 ipoib_warn(priv, "ipoib_cm_post_receive_srq "
1632 "failed for buf %d\n", i);
1633 ipoib_cm_dev_cleanup(dev);
1634 return -EIO;
1635 }
1636 }
1637 }
1638
1639 priv->dev->dev_addr[0] = IPOIB_FLAGS_RC;
1640 return 0;
1641 }
1642
1643 void ipoib_cm_dev_cleanup(struct net_device *dev)
1644 {
1645 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1646 int ret;
1647
1648 if (!priv->cm.srq)
1649 return;
1650
1651 ipoib_dbg(priv, "Cleanup ipoib connected mode.\n");
1652
1653 ret = ib_destroy_srq(priv->cm.srq);
1654 if (ret)
1655 ipoib_warn(priv, "ib_destroy_srq failed: %d\n", ret);
1656
1657 priv->cm.srq = NULL;
1658 if (!priv->cm.srq_ring)
1659 return;
1660
1661 ipoib_cm_free_rx_ring(dev, priv->cm.srq_ring);
1662 priv->cm.srq_ring = NULL;
1663 }
CRIS linux kernel tree