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c781c7c633fdbf2b27a3bc70ca578511a2eb6839
[GitHub/mt8127/android_kernel_alcatel_ttab.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 .wr_id = IPOIB_CM_RX_DRAIN_WRID,
74 .opcode = IB_WR_SEND,
75 };
76
77 static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id,
78 struct ib_cm_event *event);
79
80 static void ipoib_cm_dma_unmap_rx(struct ipoib_dev_priv *priv, int frags,
81 u64 mapping[IPOIB_CM_RX_SG])
82 {
83 int i;
84
85 ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_CM_HEAD_SIZE, DMA_FROM_DEVICE);
86
87 for (i = 0; i < frags; ++i)
88 ib_dma_unmap_page(priv->ca, mapping[i + 1], PAGE_SIZE, DMA_FROM_DEVICE);
89 }
90
91 static int ipoib_cm_post_receive_srq(struct net_device *dev, int id)
92 {
93 struct ipoib_dev_priv *priv = netdev_priv(dev);
94 struct ib_recv_wr *bad_wr;
95 int i, ret;
96
97 priv->cm.rx_wr.wr_id = id | IPOIB_OP_CM | IPOIB_OP_RECV;
98
99 for (i = 0; i < priv->cm.num_frags; ++i)
100 priv->cm.rx_sge[i].addr = priv->cm.srq_ring[id].mapping[i];
101
102 ret = ib_post_srq_recv(priv->cm.srq, &priv->cm.rx_wr, &bad_wr);
103 if (unlikely(ret)) {
104 ipoib_warn(priv, "post srq failed for buf %d (%d)\n", id, ret);
105 ipoib_cm_dma_unmap_rx(priv, priv->cm.num_frags - 1,
106 priv->cm.srq_ring[id].mapping);
107 dev_kfree_skb_any(priv->cm.srq_ring[id].skb);
108 priv->cm.srq_ring[id].skb = NULL;
109 }
110
111 return ret;
112 }
113
114 static int ipoib_cm_post_receive_nonsrq(struct net_device *dev,
115 struct ipoib_cm_rx *rx,
116 struct ib_recv_wr *wr,
117 struct ib_sge *sge, int id)
118 {
119 struct ipoib_dev_priv *priv = netdev_priv(dev);
120 struct ib_recv_wr *bad_wr;
121 int i, ret;
122
123 wr->wr_id = id | IPOIB_OP_CM | IPOIB_OP_RECV;
124
125 for (i = 0; i < IPOIB_CM_RX_SG; ++i)
126 sge[i].addr = rx->rx_ring[id].mapping[i];
127
128 ret = ib_post_recv(rx->qp, wr, &bad_wr);
129 if (unlikely(ret)) {
130 ipoib_warn(priv, "post recv failed for buf %d (%d)\n", id, ret);
131 ipoib_cm_dma_unmap_rx(priv, IPOIB_CM_RX_SG - 1,
132 rx->rx_ring[id].mapping);
133 dev_kfree_skb_any(rx->rx_ring[id].skb);
134 rx->rx_ring[id].skb = NULL;
135 }
136
137 return ret;
138 }
139
140 static struct sk_buff *ipoib_cm_alloc_rx_skb(struct net_device *dev,
141 struct ipoib_cm_rx_buf *rx_ring,
142 int id, int frags,
143 u64 mapping[IPOIB_CM_RX_SG])
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_ATOMIC);
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 if (ib_post_send(p->qp, &ipoib_cm_rx_drain_wr, &bad_wr))
226 ipoib_warn(priv, "failed to post drain wr\n");
227
228 list_splice_init(&priv->cm.rx_flush_list, &priv->cm.rx_drain_list);
229 }
230
231 static void ipoib_cm_rx_event_handler(struct ib_event *event, void *ctx)
232 {
233 struct ipoib_cm_rx *p = ctx;
234 struct ipoib_dev_priv *priv = netdev_priv(p->dev);
235 unsigned long flags;
236
237 if (event->event != IB_EVENT_QP_LAST_WQE_REACHED)
238 return;
239
240 spin_lock_irqsave(&priv->lock, flags);
241 list_move(&p->list, &priv->cm.rx_flush_list);
242 p->state = IPOIB_CM_RX_FLUSH;
243 ipoib_cm_start_rx_drain(priv);
244 spin_unlock_irqrestore(&priv->lock, flags);
245 }
246
247 static struct ib_qp *ipoib_cm_create_rx_qp(struct net_device *dev,
248 struct ipoib_cm_rx *p)
249 {
250 struct ipoib_dev_priv *priv = netdev_priv(dev);
251 struct ib_qp_init_attr attr = {
252 .event_handler = ipoib_cm_rx_event_handler,
253 .send_cq = priv->recv_cq, /* For drain WR */
254 .recv_cq = priv->recv_cq,
255 .srq = priv->cm.srq,
256 .cap.max_send_wr = 1, /* For drain WR */
257 .cap.max_send_sge = 1, /* FIXME: 0 Seems not to work */
258 .sq_sig_type = IB_SIGNAL_ALL_WR,
259 .qp_type = IB_QPT_RC,
260 .qp_context = p,
261 };
262
263 if (!ipoib_cm_has_srq(dev)) {
264 attr.cap.max_recv_wr = ipoib_recvq_size;
265 attr.cap.max_recv_sge = IPOIB_CM_RX_SG;
266 }
267
268 return ib_create_qp(priv->pd, &attr);
269 }
270
271 static int ipoib_cm_modify_rx_qp(struct net_device *dev,
272 struct ib_cm_id *cm_id, struct ib_qp *qp,
273 unsigned psn)
274 {
275 struct ipoib_dev_priv *priv = netdev_priv(dev);
276 struct ib_qp_attr qp_attr;
277 int qp_attr_mask, ret;
278
279 qp_attr.qp_state = IB_QPS_INIT;
280 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
281 if (ret) {
282 ipoib_warn(priv, "failed to init QP attr for INIT: %d\n", ret);
283 return ret;
284 }
285 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
286 if (ret) {
287 ipoib_warn(priv, "failed to modify QP to INIT: %d\n", ret);
288 return ret;
289 }
290 qp_attr.qp_state = IB_QPS_RTR;
291 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
292 if (ret) {
293 ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret);
294 return ret;
295 }
296 qp_attr.rq_psn = psn;
297 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
298 if (ret) {
299 ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret);
300 return ret;
301 }
302
303 /*
304 * Current Mellanox HCA firmware won't generate completions
305 * with error for drain WRs unless the QP has been moved to
306 * RTS first. This work-around leaves a window where a QP has
307 * moved to error asynchronously, but this will eventually get
308 * fixed in firmware, so let's not error out if modify QP
309 * fails.
310 */
311 qp_attr.qp_state = IB_QPS_RTS;
312 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
313 if (ret) {
314 ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret);
315 return 0;
316 }
317 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
318 if (ret) {
319 ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret);
320 return 0;
321 }
322
323 return 0;
324 }
325
326 static void ipoib_cm_init_rx_wr(struct net_device *dev,
327 struct ib_recv_wr *wr,
328 struct ib_sge *sge)
329 {
330 struct ipoib_dev_priv *priv = netdev_priv(dev);
331 int i;
332
333 for (i = 0; i < priv->cm.num_frags; ++i)
334 sge[i].lkey = priv->mr->lkey;
335
336 sge[0].length = IPOIB_CM_HEAD_SIZE;
337 for (i = 1; i < priv->cm.num_frags; ++i)
338 sge[i].length = PAGE_SIZE;
339
340 wr->next = NULL;
341 wr->sg_list = sge;
342 wr->num_sge = priv->cm.num_frags;
343 }
344
345 static int ipoib_cm_nonsrq_init_rx(struct net_device *dev, struct ib_cm_id *cm_id,
346 struct ipoib_cm_rx *rx)
347 {
348 struct ipoib_dev_priv *priv = netdev_priv(dev);
349 struct {
350 struct ib_recv_wr wr;
351 struct ib_sge sge[IPOIB_CM_RX_SG];
352 } *t;
353 int ret;
354 int i;
355
356 rx->rx_ring = vzalloc(ipoib_recvq_size * sizeof *rx->rx_ring);
357 if (!rx->rx_ring) {
358 printk(KERN_WARNING "%s: failed to allocate CM non-SRQ ring (%d entries)\n",
359 priv->ca->name, ipoib_recvq_size);
360 return -ENOMEM;
361 }
362
363 t = kmalloc(sizeof *t, GFP_KERNEL);
364 if (!t) {
365 ret = -ENOMEM;
366 goto err_free;
367 }
368
369 ipoib_cm_init_rx_wr(dev, &t->wr, t->sge);
370
371 spin_lock_irq(&priv->lock);
372
373 if (priv->cm.nonsrq_conn_qp >= ipoib_max_conn_qp) {
374 spin_unlock_irq(&priv->lock);
375 ib_send_cm_rej(cm_id, IB_CM_REJ_NO_QP, NULL, 0, NULL, 0);
376 ret = -EINVAL;
377 goto err_free;
378 } else
379 ++priv->cm.nonsrq_conn_qp;
380
381 spin_unlock_irq(&priv->lock);
382
383 for (i = 0; i < ipoib_recvq_size; ++i) {
384 if (!ipoib_cm_alloc_rx_skb(dev, rx->rx_ring, i, IPOIB_CM_RX_SG - 1,
385 rx->rx_ring[i].mapping)) {
386 ipoib_warn(priv, "failed to allocate receive buffer %d\n", i);
387 ret = -ENOMEM;
388 goto err_count;
389 }
390 ret = ipoib_cm_post_receive_nonsrq(dev, rx, &t->wr, t->sge, i);
391 if (ret) {
392 ipoib_warn(priv, "ipoib_cm_post_receive_nonsrq "
393 "failed for buf %d\n", i);
394 ret = -EIO;
395 goto err_count;
396 }
397 }
398
399 rx->recv_count = ipoib_recvq_size;
400
401 kfree(t);
402
403 return 0;
404
405 err_count:
406 spin_lock_irq(&priv->lock);
407 --priv->cm.nonsrq_conn_qp;
408 spin_unlock_irq(&priv->lock);
409
410 err_free:
411 kfree(t);
412 ipoib_cm_free_rx_ring(dev, rx->rx_ring);
413
414 return ret;
415 }
416
417 static int ipoib_cm_send_rep(struct net_device *dev, struct ib_cm_id *cm_id,
418 struct ib_qp *qp, struct ib_cm_req_event_param *req,
419 unsigned psn)
420 {
421 struct ipoib_dev_priv *priv = netdev_priv(dev);
422 struct ipoib_cm_data data = {};
423 struct ib_cm_rep_param rep = {};
424
425 data.qpn = cpu_to_be32(priv->qp->qp_num);
426 data.mtu = cpu_to_be32(IPOIB_CM_BUF_SIZE);
427
428 rep.private_data = &data;
429 rep.private_data_len = sizeof data;
430 rep.flow_control = 0;
431 rep.rnr_retry_count = req->rnr_retry_count;
432 rep.srq = ipoib_cm_has_srq(dev);
433 rep.qp_num = qp->qp_num;
434 rep.starting_psn = psn;
435 return ib_send_cm_rep(cm_id, &rep);
436 }
437
438 static int ipoib_cm_req_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
439 {
440 struct net_device *dev = cm_id->context;
441 struct ipoib_dev_priv *priv = netdev_priv(dev);
442 struct ipoib_cm_rx *p;
443 unsigned psn;
444 int ret;
445
446 ipoib_dbg(priv, "REQ arrived\n");
447 p = kzalloc(sizeof *p, GFP_KERNEL);
448 if (!p)
449 return -ENOMEM;
450 p->dev = dev;
451 p->id = cm_id;
452 cm_id->context = p;
453 p->state = IPOIB_CM_RX_LIVE;
454 p->jiffies = jiffies;
455 INIT_LIST_HEAD(&p->list);
456
457 p->qp = ipoib_cm_create_rx_qp(dev, p);
458 if (IS_ERR(p->qp)) {
459 ret = PTR_ERR(p->qp);
460 goto err_qp;
461 }
462
463 psn = prandom_u32() & 0xffffff;
464 ret = ipoib_cm_modify_rx_qp(dev, cm_id, p->qp, psn);
465 if (ret)
466 goto err_modify;
467
468 if (!ipoib_cm_has_srq(dev)) {
469 ret = ipoib_cm_nonsrq_init_rx(dev, cm_id, p);
470 if (ret)
471 goto err_modify;
472 }
473
474 spin_lock_irq(&priv->lock);
475 queue_delayed_work(ipoib_workqueue,
476 &priv->cm.stale_task, IPOIB_CM_RX_DELAY);
477 /* Add this entry to passive ids list head, but do not re-add it
478 * if IB_EVENT_QP_LAST_WQE_REACHED has moved it to flush list. */
479 p->jiffies = jiffies;
480 if (p->state == IPOIB_CM_RX_LIVE)
481 list_move(&p->list, &priv->cm.passive_ids);
482 spin_unlock_irq(&priv->lock);
483
484 ret = ipoib_cm_send_rep(dev, cm_id, p->qp, &event->param.req_rcvd, psn);
485 if (ret) {
486 ipoib_warn(priv, "failed to send REP: %d\n", ret);
487 if (ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE))
488 ipoib_warn(priv, "unable to move qp to error state\n");
489 }
490 return 0;
491
492 err_modify:
493 ib_destroy_qp(p->qp);
494 err_qp:
495 kfree(p);
496 return ret;
497 }
498
499 static int ipoib_cm_rx_handler(struct ib_cm_id *cm_id,
500 struct ib_cm_event *event)
501 {
502 struct ipoib_cm_rx *p;
503 struct ipoib_dev_priv *priv;
504
505 switch (event->event) {
506 case IB_CM_REQ_RECEIVED:
507 return ipoib_cm_req_handler(cm_id, event);
508 case IB_CM_DREQ_RECEIVED:
509 p = cm_id->context;
510 ib_send_cm_drep(cm_id, NULL, 0);
511 /* Fall through */
512 case IB_CM_REJ_RECEIVED:
513 p = cm_id->context;
514 priv = netdev_priv(p->dev);
515 if (ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE))
516 ipoib_warn(priv, "unable to move qp to error state\n");
517 /* Fall through */
518 default:
519 return 0;
520 }
521 }
522 /* Adjust length of skb with fragments to match received data */
523 static void skb_put_frags(struct sk_buff *skb, unsigned int hdr_space,
524 unsigned int length, struct sk_buff *toskb)
525 {
526 int i, num_frags;
527 unsigned int size;
528
529 /* put header into skb */
530 size = min(length, hdr_space);
531 skb->tail += size;
532 skb->len += size;
533 length -= size;
534
535 num_frags = skb_shinfo(skb)->nr_frags;
536 for (i = 0; i < num_frags; i++) {
537 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
538
539 if (length == 0) {
540 /* don't need this page */
541 skb_fill_page_desc(toskb, i, skb_frag_page(frag),
542 0, PAGE_SIZE);
543 --skb_shinfo(skb)->nr_frags;
544 } else {
545 size = min(length, (unsigned) PAGE_SIZE);
546
547 skb_frag_size_set(frag, size);
548 skb->data_len += size;
549 skb->truesize += size;
550 skb->len += size;
551 length -= size;
552 }
553 }
554 }
555
556 void ipoib_cm_handle_rx_wc(struct net_device *dev, struct ib_wc *wc)
557 {
558 struct ipoib_dev_priv *priv = netdev_priv(dev);
559 struct ipoib_cm_rx_buf *rx_ring;
560 unsigned int wr_id = wc->wr_id & ~(IPOIB_OP_CM | IPOIB_OP_RECV);
561 struct sk_buff *skb, *newskb;
562 struct ipoib_cm_rx *p;
563 unsigned long flags;
564 u64 mapping[IPOIB_CM_RX_SG];
565 int frags;
566 int has_srq;
567 struct sk_buff *small_skb;
568
569 ipoib_dbg_data(priv, "cm recv completion: id %d, status: %d\n",
570 wr_id, wc->status);
571
572 if (unlikely(wr_id >= ipoib_recvq_size)) {
573 if (wr_id == (IPOIB_CM_RX_DRAIN_WRID & ~(IPOIB_OP_CM | IPOIB_OP_RECV))) {
574 spin_lock_irqsave(&priv->lock, flags);
575 list_splice_init(&priv->cm.rx_drain_list, &priv->cm.rx_reap_list);
576 ipoib_cm_start_rx_drain(priv);
577 queue_work(ipoib_workqueue, &priv->cm.rx_reap_task);
578 spin_unlock_irqrestore(&priv->lock, flags);
579 } else
580 ipoib_warn(priv, "cm recv completion event with wrid %d (> %d)\n",
581 wr_id, ipoib_recvq_size);
582 return;
583 }
584
585 p = wc->qp->qp_context;
586
587 has_srq = ipoib_cm_has_srq(dev);
588 rx_ring = has_srq ? priv->cm.srq_ring : p->rx_ring;
589
590 skb = rx_ring[wr_id].skb;
591
592 if (unlikely(wc->status != IB_WC_SUCCESS)) {
593 ipoib_dbg(priv, "cm recv error "
594 "(status=%d, wrid=%d vend_err %x)\n",
595 wc->status, wr_id, wc->vendor_err);
596 ++dev->stats.rx_dropped;
597 if (has_srq)
598 goto repost;
599 else {
600 if (!--p->recv_count) {
601 spin_lock_irqsave(&priv->lock, flags);
602 list_move(&p->list, &priv->cm.rx_reap_list);
603 spin_unlock_irqrestore(&priv->lock, flags);
604 queue_work(ipoib_workqueue, &priv->cm.rx_reap_task);
605 }
606 return;
607 }
608 }
609
610 if (unlikely(!(wr_id & IPOIB_CM_RX_UPDATE_MASK))) {
611 if (p && time_after_eq(jiffies, p->jiffies + IPOIB_CM_RX_UPDATE_TIME)) {
612 spin_lock_irqsave(&priv->lock, flags);
613 p->jiffies = jiffies;
614 /* Move this entry to list head, but do not re-add it
615 * if it has been moved out of list. */
616 if (p->state == IPOIB_CM_RX_LIVE)
617 list_move(&p->list, &priv->cm.passive_ids);
618 spin_unlock_irqrestore(&priv->lock, flags);
619 }
620 }
621
622 if (wc->byte_len < IPOIB_CM_COPYBREAK) {
623 int dlen = wc->byte_len;
624
625 small_skb = dev_alloc_skb(dlen + 12);
626 if (small_skb) {
627 skb_reserve(small_skb, 12);
628 ib_dma_sync_single_for_cpu(priv->ca, rx_ring[wr_id].mapping[0],
629 dlen, DMA_FROM_DEVICE);
630 skb_copy_from_linear_data(skb, small_skb->data, dlen);
631 ib_dma_sync_single_for_device(priv->ca, rx_ring[wr_id].mapping[0],
632 dlen, DMA_FROM_DEVICE);
633 skb_put(small_skb, dlen);
634 skb = small_skb;
635 goto copied;
636 }
637 }
638
639 frags = PAGE_ALIGN(wc->byte_len - min(wc->byte_len,
640 (unsigned)IPOIB_CM_HEAD_SIZE)) / PAGE_SIZE;
641
642 newskb = ipoib_cm_alloc_rx_skb(dev, rx_ring, wr_id, frags, mapping);
643 if (unlikely(!newskb)) {
644 /*
645 * If we can't allocate a new RX buffer, dump
646 * this packet and reuse the old buffer.
647 */
648 ipoib_dbg(priv, "failed to allocate receive buffer %d\n", wr_id);
649 ++dev->stats.rx_dropped;
650 goto repost;
651 }
652
653 ipoib_cm_dma_unmap_rx(priv, frags, rx_ring[wr_id].mapping);
654 memcpy(rx_ring[wr_id].mapping, mapping, (frags + 1) * sizeof *mapping);
655
656 ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n",
657 wc->byte_len, wc->slid);
658
659 skb_put_frags(skb, IPOIB_CM_HEAD_SIZE, wc->byte_len, newskb);
660
661 copied:
662 skb->protocol = ((struct ipoib_header *) skb->data)->proto;
663 skb_reset_mac_header(skb);
664 skb_pull(skb, IPOIB_ENCAP_LEN);
665
666 ++dev->stats.rx_packets;
667 dev->stats.rx_bytes += skb->len;
668
669 skb->dev = dev;
670 /* XXX get correct PACKET_ type here */
671 skb->pkt_type = PACKET_HOST;
672 netif_receive_skb(skb);
673
674 repost:
675 if (has_srq) {
676 if (unlikely(ipoib_cm_post_receive_srq(dev, wr_id)))
677 ipoib_warn(priv, "ipoib_cm_post_receive_srq failed "
678 "for buf %d\n", wr_id);
679 } else {
680 if (unlikely(ipoib_cm_post_receive_nonsrq(dev, p,
681 &priv->cm.rx_wr,
682 priv->cm.rx_sge,
683 wr_id))) {
684 --p->recv_count;
685 ipoib_warn(priv, "ipoib_cm_post_receive_nonsrq failed "
686 "for buf %d\n", wr_id);
687 }
688 }
689 }
690
691 static inline int post_send(struct ipoib_dev_priv *priv,
692 struct ipoib_cm_tx *tx,
693 unsigned int wr_id,
694 u64 addr, int len)
695 {
696 struct ib_send_wr *bad_wr;
697
698 priv->tx_sge[0].addr = addr;
699 priv->tx_sge[0].length = len;
700
701 priv->tx_wr.num_sge = 1;
702 priv->tx_wr.wr_id = wr_id | IPOIB_OP_CM;
703
704 return ib_post_send(tx->qp, &priv->tx_wr, &bad_wr);
705 }
706
707 void ipoib_cm_send(struct net_device *dev, struct sk_buff *skb, struct ipoib_cm_tx *tx)
708 {
709 struct ipoib_dev_priv *priv = netdev_priv(dev);
710 struct ipoib_cm_tx_buf *tx_req;
711 u64 addr;
712 int rc;
713
714 if (unlikely(skb->len > tx->mtu)) {
715 ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n",
716 skb->len, tx->mtu);
717 ++dev->stats.tx_dropped;
718 ++dev->stats.tx_errors;
719 ipoib_cm_skb_too_long(dev, skb, tx->mtu - IPOIB_ENCAP_LEN);
720 return;
721 }
722
723 ipoib_dbg_data(priv, "sending packet: head 0x%x length %d connection 0x%x\n",
724 tx->tx_head, skb->len, tx->qp->qp_num);
725
726 /*
727 * We put the skb into the tx_ring _before_ we call post_send()
728 * because it's entirely possible that the completion handler will
729 * run before we execute anything after the post_send(). That
730 * means we have to make sure everything is properly recorded and
731 * our state is consistent before we call post_send().
732 */
733 tx_req = &tx->tx_ring[tx->tx_head & (ipoib_sendq_size - 1)];
734 tx_req->skb = skb;
735 addr = ib_dma_map_single(priv->ca, skb->data, skb->len, DMA_TO_DEVICE);
736 if (unlikely(ib_dma_mapping_error(priv->ca, addr))) {
737 ++dev->stats.tx_errors;
738 dev_kfree_skb_any(skb);
739 return;
740 }
741
742 tx_req->mapping = addr;
743
744 skb_orphan(skb);
745 skb_dst_drop(skb);
746
747 rc = post_send(priv, tx, tx->tx_head & (ipoib_sendq_size - 1),
748 addr, skb->len);
749 if (unlikely(rc)) {
750 ipoib_warn(priv, "post_send failed, error %d\n", rc);
751 ++dev->stats.tx_errors;
752 ib_dma_unmap_single(priv->ca, addr, skb->len, DMA_TO_DEVICE);
753 dev_kfree_skb_any(skb);
754 } else {
755 dev->trans_start = jiffies;
756 ++tx->tx_head;
757
758 if (++priv->tx_outstanding == ipoib_sendq_size) {
759 ipoib_dbg(priv, "TX ring 0x%x full, stopping kernel net queue\n",
760 tx->qp->qp_num);
761 netif_stop_queue(dev);
762 rc = ib_req_notify_cq(priv->send_cq,
763 IB_CQ_NEXT_COMP | IB_CQ_REPORT_MISSED_EVENTS);
764 if (rc < 0)
765 ipoib_warn(priv, "request notify on send CQ failed\n");
766 else if (rc)
767 ipoib_send_comp_handler(priv->send_cq, dev);
768 }
769 }
770 }
771
772 void ipoib_cm_handle_tx_wc(struct net_device *dev, struct ib_wc *wc)
773 {
774 struct ipoib_dev_priv *priv = netdev_priv(dev);
775 struct ipoib_cm_tx *tx = wc->qp->qp_context;
776 unsigned int wr_id = wc->wr_id & ~IPOIB_OP_CM;
777 struct ipoib_cm_tx_buf *tx_req;
778 unsigned long flags;
779
780 ipoib_dbg_data(priv, "cm send completion: id %d, status: %d\n",
781 wr_id, wc->status);
782
783 if (unlikely(wr_id >= ipoib_sendq_size)) {
784 ipoib_warn(priv, "cm send completion event with wrid %d (> %d)\n",
785 wr_id, ipoib_sendq_size);
786 return;
787 }
788
789 tx_req = &tx->tx_ring[wr_id];
790
791 ib_dma_unmap_single(priv->ca, tx_req->mapping, tx_req->skb->len, DMA_TO_DEVICE);
792
793 /* FIXME: is this right? Shouldn't we only increment on success? */
794 ++dev->stats.tx_packets;
795 dev->stats.tx_bytes += tx_req->skb->len;
796
797 dev_kfree_skb_any(tx_req->skb);
798
799 netif_tx_lock(dev);
800
801 ++tx->tx_tail;
802 if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) &&
803 netif_queue_stopped(dev) &&
804 test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
805 netif_wake_queue(dev);
806
807 if (wc->status != IB_WC_SUCCESS &&
808 wc->status != IB_WC_WR_FLUSH_ERR) {
809 struct ipoib_neigh *neigh;
810
811 ipoib_dbg(priv, "failed cm send event "
812 "(status=%d, wrid=%d vend_err %x)\n",
813 wc->status, wr_id, wc->vendor_err);
814
815 spin_lock_irqsave(&priv->lock, flags);
816 neigh = tx->neigh;
817
818 if (neigh) {
819 neigh->cm = NULL;
820 list_del(&neigh->list);
821 ipoib_neigh_free(neigh);
822
823 tx->neigh = NULL;
824 }
825
826 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
827 list_move(&tx->list, &priv->cm.reap_list);
828 queue_work(ipoib_workqueue, &priv->cm.reap_task);
829 }
830
831 clear_bit(IPOIB_FLAG_OPER_UP, &tx->flags);
832
833 spin_unlock_irqrestore(&priv->lock, flags);
834 }
835
836 netif_tx_unlock(dev);
837 }
838
839 int ipoib_cm_dev_open(struct net_device *dev)
840 {
841 struct ipoib_dev_priv *priv = netdev_priv(dev);
842 int ret;
843
844 if (!IPOIB_CM_SUPPORTED(dev->dev_addr))
845 return 0;
846
847 priv->cm.id = ib_create_cm_id(priv->ca, ipoib_cm_rx_handler, dev);
848 if (IS_ERR(priv->cm.id)) {
849 printk(KERN_WARNING "%s: failed to create CM ID\n", priv->ca->name);
850 ret = PTR_ERR(priv->cm.id);
851 goto err_cm;
852 }
853
854 ret = ib_cm_listen(priv->cm.id, cpu_to_be64(IPOIB_CM_IETF_ID | priv->qp->qp_num),
855 0, NULL);
856 if (ret) {
857 printk(KERN_WARNING "%s: failed to listen on ID 0x%llx\n", priv->ca->name,
858 IPOIB_CM_IETF_ID | priv->qp->qp_num);
859 goto err_listen;
860 }
861
862 return 0;
863
864 err_listen:
865 ib_destroy_cm_id(priv->cm.id);
866 err_cm:
867 priv->cm.id = NULL;
868 return ret;
869 }
870
871 static void ipoib_cm_free_rx_reap_list(struct net_device *dev)
872 {
873 struct ipoib_dev_priv *priv = netdev_priv(dev);
874 struct ipoib_cm_rx *rx, *n;
875 LIST_HEAD(list);
876
877 spin_lock_irq(&priv->lock);
878 list_splice_init(&priv->cm.rx_reap_list, &list);
879 spin_unlock_irq(&priv->lock);
880
881 list_for_each_entry_safe(rx, n, &list, list) {
882 ib_destroy_cm_id(rx->id);
883 ib_destroy_qp(rx->qp);
884 if (!ipoib_cm_has_srq(dev)) {
885 ipoib_cm_free_rx_ring(priv->dev, rx->rx_ring);
886 spin_lock_irq(&priv->lock);
887 --priv->cm.nonsrq_conn_qp;
888 spin_unlock_irq(&priv->lock);
889 }
890 kfree(rx);
891 }
892 }
893
894 void ipoib_cm_dev_stop(struct net_device *dev)
895 {
896 struct ipoib_dev_priv *priv = netdev_priv(dev);
897 struct ipoib_cm_rx *p;
898 unsigned long begin;
899 int ret;
900
901 if (!IPOIB_CM_SUPPORTED(dev->dev_addr) || !priv->cm.id)
902 return;
903
904 ib_destroy_cm_id(priv->cm.id);
905 priv->cm.id = NULL;
906
907 spin_lock_irq(&priv->lock);
908 while (!list_empty(&priv->cm.passive_ids)) {
909 p = list_entry(priv->cm.passive_ids.next, typeof(*p), list);
910 list_move(&p->list, &priv->cm.rx_error_list);
911 p->state = IPOIB_CM_RX_ERROR;
912 spin_unlock_irq(&priv->lock);
913 ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE);
914 if (ret)
915 ipoib_warn(priv, "unable to move qp to error state: %d\n", ret);
916 spin_lock_irq(&priv->lock);
917 }
918
919 /* Wait for all RX to be drained */
920 begin = jiffies;
921
922 while (!list_empty(&priv->cm.rx_error_list) ||
923 !list_empty(&priv->cm.rx_flush_list) ||
924 !list_empty(&priv->cm.rx_drain_list)) {
925 if (time_after(jiffies, begin + 5 * HZ)) {
926 ipoib_warn(priv, "RX drain timing out\n");
927
928 /*
929 * assume the HW is wedged and just free up everything.
930 */
931 list_splice_init(&priv->cm.rx_flush_list,
932 &priv->cm.rx_reap_list);
933 list_splice_init(&priv->cm.rx_error_list,
934 &priv->cm.rx_reap_list);
935 list_splice_init(&priv->cm.rx_drain_list,
936 &priv->cm.rx_reap_list);
937 break;
938 }
939 spin_unlock_irq(&priv->lock);
940 msleep(1);
941 ipoib_drain_cq(dev);
942 spin_lock_irq(&priv->lock);
943 }
944
945 spin_unlock_irq(&priv->lock);
946
947 ipoib_cm_free_rx_reap_list(dev);
948
949 cancel_delayed_work(&priv->cm.stale_task);
950 }
951
952 static int ipoib_cm_rep_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
953 {
954 struct ipoib_cm_tx *p = cm_id->context;
955 struct ipoib_dev_priv *priv = netdev_priv(p->dev);
956 struct ipoib_cm_data *data = event->private_data;
957 struct sk_buff_head skqueue;
958 struct ib_qp_attr qp_attr;
959 int qp_attr_mask, ret;
960 struct sk_buff *skb;
961
962 p->mtu = be32_to_cpu(data->mtu);
963
964 if (p->mtu <= IPOIB_ENCAP_LEN) {
965 ipoib_warn(priv, "Rejecting connection: mtu %d <= %d\n",
966 p->mtu, IPOIB_ENCAP_LEN);
967 return -EINVAL;
968 }
969
970 qp_attr.qp_state = IB_QPS_RTR;
971 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
972 if (ret) {
973 ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret);
974 return ret;
975 }
976
977 qp_attr.rq_psn = 0 /* FIXME */;
978 ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask);
979 if (ret) {
980 ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret);
981 return ret;
982 }
983
984 qp_attr.qp_state = IB_QPS_RTS;
985 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
986 if (ret) {
987 ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret);
988 return ret;
989 }
990 ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask);
991 if (ret) {
992 ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret);
993 return ret;
994 }
995
996 skb_queue_head_init(&skqueue);
997
998 spin_lock_irq(&priv->lock);
999 set_bit(IPOIB_FLAG_OPER_UP, &p->flags);
1000 if (p->neigh)
1001 while ((skb = __skb_dequeue(&p->neigh->queue)))
1002 __skb_queue_tail(&skqueue, skb);
1003 spin_unlock_irq(&priv->lock);
1004
1005 while ((skb = __skb_dequeue(&skqueue))) {
1006 skb->dev = p->dev;
1007 if (dev_queue_xmit(skb))
1008 ipoib_warn(priv, "dev_queue_xmit failed "
1009 "to requeue packet\n");
1010 }
1011
1012 ret = ib_send_cm_rtu(cm_id, NULL, 0);
1013 if (ret) {
1014 ipoib_warn(priv, "failed to send RTU: %d\n", ret);
1015 return ret;
1016 }
1017 return 0;
1018 }
1019
1020 static struct ib_qp *ipoib_cm_create_tx_qp(struct net_device *dev, struct ipoib_cm_tx *tx)
1021 {
1022 struct ipoib_dev_priv *priv = netdev_priv(dev);
1023 struct ib_qp_init_attr attr = {
1024 .send_cq = priv->recv_cq,
1025 .recv_cq = priv->recv_cq,
1026 .srq = priv->cm.srq,
1027 .cap.max_send_wr = ipoib_sendq_size,
1028 .cap.max_send_sge = 1,
1029 .sq_sig_type = IB_SIGNAL_ALL_WR,
1030 .qp_type = IB_QPT_RC,
1031 .qp_context = tx
1032 };
1033
1034 return ib_create_qp(priv->pd, &attr);
1035 }
1036
1037 static int ipoib_cm_send_req(struct net_device *dev,
1038 struct ib_cm_id *id, struct ib_qp *qp,
1039 u32 qpn,
1040 struct ib_sa_path_rec *pathrec)
1041 {
1042 struct ipoib_dev_priv *priv = netdev_priv(dev);
1043 struct ipoib_cm_data data = {};
1044 struct ib_cm_req_param req = {};
1045
1046 data.qpn = cpu_to_be32(priv->qp->qp_num);
1047 data.mtu = cpu_to_be32(IPOIB_CM_BUF_SIZE);
1048
1049 req.primary_path = pathrec;
1050 req.alternate_path = NULL;
1051 req.service_id = cpu_to_be64(IPOIB_CM_IETF_ID | qpn);
1052 req.qp_num = qp->qp_num;
1053 req.qp_type = qp->qp_type;
1054 req.private_data = &data;
1055 req.private_data_len = sizeof data;
1056 req.flow_control = 0;
1057
1058 req.starting_psn = 0; /* FIXME */
1059
1060 /*
1061 * Pick some arbitrary defaults here; we could make these
1062 * module parameters if anyone cared about setting them.
1063 */
1064 req.responder_resources = 4;
1065 req.remote_cm_response_timeout = 20;
1066 req.local_cm_response_timeout = 20;
1067 req.retry_count = 0; /* RFC draft warns against retries */
1068 req.rnr_retry_count = 0; /* RFC draft warns against retries */
1069 req.max_cm_retries = 15;
1070 req.srq = ipoib_cm_has_srq(dev);
1071 return ib_send_cm_req(id, &req);
1072 }
1073
1074 static int ipoib_cm_modify_tx_init(struct net_device *dev,
1075 struct ib_cm_id *cm_id, struct ib_qp *qp)
1076 {
1077 struct ipoib_dev_priv *priv = netdev_priv(dev);
1078 struct ib_qp_attr qp_attr;
1079 int qp_attr_mask, ret;
1080 ret = ib_find_pkey(priv->ca, priv->port, priv->pkey, &qp_attr.pkey_index);
1081 if (ret) {
1082 ipoib_warn(priv, "pkey 0x%x not found: %d\n", priv->pkey, ret);
1083 return ret;
1084 }
1085
1086 qp_attr.qp_state = IB_QPS_INIT;
1087 qp_attr.qp_access_flags = IB_ACCESS_LOCAL_WRITE;
1088 qp_attr.port_num = priv->port;
1089 qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS | IB_QP_PKEY_INDEX | IB_QP_PORT;
1090
1091 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
1092 if (ret) {
1093 ipoib_warn(priv, "failed to modify tx QP to INIT: %d\n", ret);
1094 return ret;
1095 }
1096 return 0;
1097 }
1098
1099 static int ipoib_cm_tx_init(struct ipoib_cm_tx *p, u32 qpn,
1100 struct ib_sa_path_rec *pathrec)
1101 {
1102 struct ipoib_dev_priv *priv = netdev_priv(p->dev);
1103 int ret;
1104
1105 p->tx_ring = vzalloc(ipoib_sendq_size * sizeof *p->tx_ring);
1106 if (!p->tx_ring) {
1107 ipoib_warn(priv, "failed to allocate tx ring\n");
1108 ret = -ENOMEM;
1109 goto err_tx;
1110 }
1111
1112 p->qp = ipoib_cm_create_tx_qp(p->dev, p);
1113 if (IS_ERR(p->qp)) {
1114 ret = PTR_ERR(p->qp);
1115 ipoib_warn(priv, "failed to allocate tx qp: %d\n", ret);
1116 goto err_qp;
1117 }
1118
1119 p->id = ib_create_cm_id(priv->ca, ipoib_cm_tx_handler, p);
1120 if (IS_ERR(p->id)) {
1121 ret = PTR_ERR(p->id);
1122 ipoib_warn(priv, "failed to create tx cm id: %d\n", ret);
1123 goto err_id;
1124 }
1125
1126 ret = ipoib_cm_modify_tx_init(p->dev, p->id, p->qp);
1127 if (ret) {
1128 ipoib_warn(priv, "failed to modify tx qp to rtr: %d\n", ret);
1129 goto err_modify;
1130 }
1131
1132 ret = ipoib_cm_send_req(p->dev, p->id, p->qp, qpn, pathrec);
1133 if (ret) {
1134 ipoib_warn(priv, "failed to send cm req: %d\n", ret);
1135 goto err_send_cm;
1136 }
1137
1138 ipoib_dbg(priv, "Request connection 0x%x for gid %pI6 qpn 0x%x\n",
1139 p->qp->qp_num, pathrec->dgid.raw, qpn);
1140
1141 return 0;
1142
1143 err_send_cm:
1144 err_modify:
1145 ib_destroy_cm_id(p->id);
1146 err_id:
1147 p->id = NULL;
1148 ib_destroy_qp(p->qp);
1149 err_qp:
1150 p->qp = NULL;
1151 vfree(p->tx_ring);
1152 err_tx:
1153 return ret;
1154 }
1155
1156 static void ipoib_cm_tx_destroy(struct ipoib_cm_tx *p)
1157 {
1158 struct ipoib_dev_priv *priv = netdev_priv(p->dev);
1159 struct ipoib_cm_tx_buf *tx_req;
1160 unsigned long begin;
1161
1162 ipoib_dbg(priv, "Destroy active connection 0x%x head 0x%x tail 0x%x\n",
1163 p->qp ? p->qp->qp_num : 0, p->tx_head, p->tx_tail);
1164
1165 if (p->id)
1166 ib_destroy_cm_id(p->id);
1167
1168 if (p->tx_ring) {
1169 /* Wait for all sends to complete */
1170 begin = jiffies;
1171 while ((int) p->tx_tail - (int) p->tx_head < 0) {
1172 if (time_after(jiffies, begin + 5 * HZ)) {
1173 ipoib_warn(priv, "timing out; %d sends not completed\n",
1174 p->tx_head - p->tx_tail);
1175 goto timeout;
1176 }
1177
1178 msleep(1);
1179 }
1180 }
1181
1182 timeout:
1183
1184 while ((int) p->tx_tail - (int) p->tx_head < 0) {
1185 tx_req = &p->tx_ring[p->tx_tail & (ipoib_sendq_size - 1)];
1186 ib_dma_unmap_single(priv->ca, tx_req->mapping, tx_req->skb->len,
1187 DMA_TO_DEVICE);
1188 dev_kfree_skb_any(tx_req->skb);
1189 ++p->tx_tail;
1190 netif_tx_lock_bh(p->dev);
1191 if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) &&
1192 netif_queue_stopped(p->dev) &&
1193 test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
1194 netif_wake_queue(p->dev);
1195 netif_tx_unlock_bh(p->dev);
1196 }
1197
1198 if (p->qp)
1199 ib_destroy_qp(p->qp);
1200
1201 vfree(p->tx_ring);
1202 kfree(p);
1203 }
1204
1205 static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id,
1206 struct ib_cm_event *event)
1207 {
1208 struct ipoib_cm_tx *tx = cm_id->context;
1209 struct ipoib_dev_priv *priv = netdev_priv(tx->dev);
1210 struct net_device *dev = priv->dev;
1211 struct ipoib_neigh *neigh;
1212 unsigned long flags;
1213 int ret;
1214
1215 switch (event->event) {
1216 case IB_CM_DREQ_RECEIVED:
1217 ipoib_dbg(priv, "DREQ received.\n");
1218 ib_send_cm_drep(cm_id, NULL, 0);
1219 break;
1220 case IB_CM_REP_RECEIVED:
1221 ipoib_dbg(priv, "REP received.\n");
1222 ret = ipoib_cm_rep_handler(cm_id, event);
1223 if (ret)
1224 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
1225 NULL, 0, NULL, 0);
1226 break;
1227 case IB_CM_REQ_ERROR:
1228 case IB_CM_REJ_RECEIVED:
1229 case IB_CM_TIMEWAIT_EXIT:
1230 ipoib_dbg(priv, "CM error %d.\n", event->event);
1231 netif_tx_lock_bh(dev);
1232 spin_lock_irqsave(&priv->lock, flags);
1233 neigh = tx->neigh;
1234
1235 if (neigh) {
1236 neigh->cm = NULL;
1237 list_del(&neigh->list);
1238 ipoib_neigh_free(neigh);
1239
1240 tx->neigh = NULL;
1241 }
1242
1243 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
1244 list_move(&tx->list, &priv->cm.reap_list);
1245 queue_work(ipoib_workqueue, &priv->cm.reap_task);
1246 }
1247
1248 spin_unlock_irqrestore(&priv->lock, flags);
1249 netif_tx_unlock_bh(dev);
1250 break;
1251 default:
1252 break;
1253 }
1254
1255 return 0;
1256 }
1257
1258 struct ipoib_cm_tx *ipoib_cm_create_tx(struct net_device *dev, struct ipoib_path *path,
1259 struct ipoib_neigh *neigh)
1260 {
1261 struct ipoib_dev_priv *priv = netdev_priv(dev);
1262 struct ipoib_cm_tx *tx;
1263
1264 tx = kzalloc(sizeof *tx, GFP_ATOMIC);
1265 if (!tx)
1266 return NULL;
1267
1268 neigh->cm = tx;
1269 tx->neigh = neigh;
1270 tx->path = path;
1271 tx->dev = dev;
1272 list_add(&tx->list, &priv->cm.start_list);
1273 set_bit(IPOIB_FLAG_INITIALIZED, &tx->flags);
1274 queue_work(ipoib_workqueue, &priv->cm.start_task);
1275 return tx;
1276 }
1277
1278 void ipoib_cm_destroy_tx(struct ipoib_cm_tx *tx)
1279 {
1280 struct ipoib_dev_priv *priv = netdev_priv(tx->dev);
1281 unsigned long flags;
1282 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
1283 spin_lock_irqsave(&priv->lock, flags);
1284 list_move(&tx->list, &priv->cm.reap_list);
1285 queue_work(ipoib_workqueue, &priv->cm.reap_task);
1286 ipoib_dbg(priv, "Reap connection for gid %pI6\n",
1287 tx->neigh->daddr + 4);
1288 tx->neigh = NULL;
1289 spin_unlock_irqrestore(&priv->lock, flags);
1290 }
1291 }
1292
1293 #define QPN_AND_OPTIONS_OFFSET 4
1294
1295 static void ipoib_cm_tx_start(struct work_struct *work)
1296 {
1297 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1298 cm.start_task);
1299 struct net_device *dev = priv->dev;
1300 struct ipoib_neigh *neigh;
1301 struct ipoib_cm_tx *p;
1302 unsigned long flags;
1303 struct ipoib_path *path;
1304 int ret;
1305
1306 struct ib_sa_path_rec pathrec;
1307 u32 qpn;
1308
1309 netif_tx_lock_bh(dev);
1310 spin_lock_irqsave(&priv->lock, flags);
1311
1312 while (!list_empty(&priv->cm.start_list)) {
1313 p = list_entry(priv->cm.start_list.next, typeof(*p), list);
1314 list_del_init(&p->list);
1315 neigh = p->neigh;
1316
1317 qpn = IPOIB_QPN(neigh->daddr);
1318 /*
1319 * As long as the search is with these 2 locks,
1320 * path existence indicates its validity.
1321 */
1322 path = __path_find(dev, neigh->daddr + QPN_AND_OPTIONS_OFFSET);
1323 if (!path) {
1324 pr_info("%s ignore not valid path %pI6\n",
1325 __func__,
1326 neigh->daddr + QPN_AND_OPTIONS_OFFSET);
1327 goto free_neigh;
1328 }
1329 memcpy(&pathrec, &p->path->pathrec, sizeof pathrec);
1330
1331 spin_unlock_irqrestore(&priv->lock, flags);
1332 netif_tx_unlock_bh(dev);
1333
1334 ret = ipoib_cm_tx_init(p, qpn, &pathrec);
1335
1336 netif_tx_lock_bh(dev);
1337 spin_lock_irqsave(&priv->lock, flags);
1338
1339 if (ret) {
1340 free_neigh:
1341 neigh = p->neigh;
1342 if (neigh) {
1343 neigh->cm = NULL;
1344 list_del(&neigh->list);
1345 ipoib_neigh_free(neigh);
1346 }
1347 list_del(&p->list);
1348 kfree(p);
1349 }
1350 }
1351
1352 spin_unlock_irqrestore(&priv->lock, flags);
1353 netif_tx_unlock_bh(dev);
1354 }
1355
1356 static void ipoib_cm_tx_reap(struct work_struct *work)
1357 {
1358 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1359 cm.reap_task);
1360 struct net_device *dev = priv->dev;
1361 struct ipoib_cm_tx *p;
1362 unsigned long flags;
1363
1364 netif_tx_lock_bh(dev);
1365 spin_lock_irqsave(&priv->lock, flags);
1366
1367 while (!list_empty(&priv->cm.reap_list)) {
1368 p = list_entry(priv->cm.reap_list.next, typeof(*p), list);
1369 list_del(&p->list);
1370 spin_unlock_irqrestore(&priv->lock, flags);
1371 netif_tx_unlock_bh(dev);
1372 ipoib_cm_tx_destroy(p);
1373 netif_tx_lock_bh(dev);
1374 spin_lock_irqsave(&priv->lock, flags);
1375 }
1376
1377 spin_unlock_irqrestore(&priv->lock, flags);
1378 netif_tx_unlock_bh(dev);
1379 }
1380
1381 static void ipoib_cm_skb_reap(struct work_struct *work)
1382 {
1383 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1384 cm.skb_task);
1385 struct net_device *dev = priv->dev;
1386 struct sk_buff *skb;
1387 unsigned long flags;
1388 unsigned mtu = priv->mcast_mtu;
1389
1390 netif_tx_lock_bh(dev);
1391 spin_lock_irqsave(&priv->lock, flags);
1392
1393 while ((skb = skb_dequeue(&priv->cm.skb_queue))) {
1394 spin_unlock_irqrestore(&priv->lock, flags);
1395 netif_tx_unlock_bh(dev);
1396
1397 if (skb->protocol == htons(ETH_P_IP))
1398 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu));
1399 #if IS_ENABLED(CONFIG_IPV6)
1400 else if (skb->protocol == htons(ETH_P_IPV6))
1401 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1402 #endif
1403 dev_kfree_skb_any(skb);
1404
1405 netif_tx_lock_bh(dev);
1406 spin_lock_irqsave(&priv->lock, flags);
1407 }
1408
1409 spin_unlock_irqrestore(&priv->lock, flags);
1410 netif_tx_unlock_bh(dev);
1411 }
1412
1413 void ipoib_cm_skb_too_long(struct net_device *dev, struct sk_buff *skb,
1414 unsigned int mtu)
1415 {
1416 struct ipoib_dev_priv *priv = netdev_priv(dev);
1417 int e = skb_queue_empty(&priv->cm.skb_queue);
1418
1419 if (skb_dst(skb))
1420 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
1421
1422 skb_queue_tail(&priv->cm.skb_queue, skb);
1423 if (e)
1424 queue_work(ipoib_workqueue, &priv->cm.skb_task);
1425 }
1426
1427 static void ipoib_cm_rx_reap(struct work_struct *work)
1428 {
1429 ipoib_cm_free_rx_reap_list(container_of(work, struct ipoib_dev_priv,
1430 cm.rx_reap_task)->dev);
1431 }
1432
1433 static void ipoib_cm_stale_task(struct work_struct *work)
1434 {
1435 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1436 cm.stale_task.work);
1437 struct ipoib_cm_rx *p;
1438 int ret;
1439
1440 spin_lock_irq(&priv->lock);
1441 while (!list_empty(&priv->cm.passive_ids)) {
1442 /* List is sorted by LRU, start from tail,
1443 * stop when we see a recently used entry */
1444 p = list_entry(priv->cm.passive_ids.prev, typeof(*p), list);
1445 if (time_before_eq(jiffies, p->jiffies + IPOIB_CM_RX_TIMEOUT))
1446 break;
1447 list_move(&p->list, &priv->cm.rx_error_list);
1448 p->state = IPOIB_CM_RX_ERROR;
1449 spin_unlock_irq(&priv->lock);
1450 ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE);
1451 if (ret)
1452 ipoib_warn(priv, "unable to move qp to error state: %d\n", ret);
1453 spin_lock_irq(&priv->lock);
1454 }
1455
1456 if (!list_empty(&priv->cm.passive_ids))
1457 queue_delayed_work(ipoib_workqueue,
1458 &priv->cm.stale_task, IPOIB_CM_RX_DELAY);
1459 spin_unlock_irq(&priv->lock);
1460 }
1461
1462
1463 static ssize_t show_mode(struct device *d, struct device_attribute *attr,
1464 char *buf)
1465 {
1466 struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(d));
1467
1468 if (test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags))
1469 return sprintf(buf, "connected\n");
1470 else
1471 return sprintf(buf, "datagram\n");
1472 }
1473
1474 static ssize_t set_mode(struct device *d, struct device_attribute *attr,
1475 const char *buf, size_t count)
1476 {
1477 struct net_device *dev = to_net_dev(d);
1478 int ret;
1479
1480 if (!rtnl_trylock())
1481 return restart_syscall();
1482
1483 ret = ipoib_set_mode(dev, buf);
1484
1485 /* The assumption is that the function ipoib_set_mode returned
1486 * with the rtnl held by it, if not the value -EBUSY returned,
1487 * then no need to rtnl_unlock
1488 */
1489 if (ret != -EBUSY)
1490 rtnl_unlock();
1491
1492 return (!ret || ret == -EBUSY) ? count : ret;
1493 }
1494
1495 static DEVICE_ATTR(mode, S_IWUSR | S_IRUGO, show_mode, set_mode);
1496
1497 int ipoib_cm_add_mode_attr(struct net_device *dev)
1498 {
1499 return device_create_file(&dev->dev, &dev_attr_mode);
1500 }
1501
1502 static void ipoib_cm_create_srq(struct net_device *dev, int max_sge)
1503 {
1504 struct ipoib_dev_priv *priv = netdev_priv(dev);
1505 struct ib_srq_init_attr srq_init_attr = {
1506 .srq_type = IB_SRQT_BASIC,
1507 .attr = {
1508 .max_wr = ipoib_recvq_size,
1509 .max_sge = max_sge
1510 }
1511 };
1512
1513 priv->cm.srq = ib_create_srq(priv->pd, &srq_init_attr);
1514 if (IS_ERR(priv->cm.srq)) {
1515 if (PTR_ERR(priv->cm.srq) != -ENOSYS)
1516 printk(KERN_WARNING "%s: failed to allocate SRQ, error %ld\n",
1517 priv->ca->name, PTR_ERR(priv->cm.srq));
1518 priv->cm.srq = NULL;
1519 return;
1520 }
1521
1522 priv->cm.srq_ring = vzalloc(ipoib_recvq_size * sizeof *priv->cm.srq_ring);
1523 if (!priv->cm.srq_ring) {
1524 printk(KERN_WARNING "%s: failed to allocate CM SRQ ring (%d entries)\n",
1525 priv->ca->name, ipoib_recvq_size);
1526 ib_destroy_srq(priv->cm.srq);
1527 priv->cm.srq = NULL;
1528 return;
1529 }
1530
1531 }
1532
1533 int ipoib_cm_dev_init(struct net_device *dev)
1534 {
1535 struct ipoib_dev_priv *priv = netdev_priv(dev);
1536 int i, ret;
1537 struct ib_device_attr attr;
1538
1539 INIT_LIST_HEAD(&priv->cm.passive_ids);
1540 INIT_LIST_HEAD(&priv->cm.reap_list);
1541 INIT_LIST_HEAD(&priv->cm.start_list);
1542 INIT_LIST_HEAD(&priv->cm.rx_error_list);
1543 INIT_LIST_HEAD(&priv->cm.rx_flush_list);
1544 INIT_LIST_HEAD(&priv->cm.rx_drain_list);
1545 INIT_LIST_HEAD(&priv->cm.rx_reap_list);
1546 INIT_WORK(&priv->cm.start_task, ipoib_cm_tx_start);
1547 INIT_WORK(&priv->cm.reap_task, ipoib_cm_tx_reap);
1548 INIT_WORK(&priv->cm.skb_task, ipoib_cm_skb_reap);
1549 INIT_WORK(&priv->cm.rx_reap_task, ipoib_cm_rx_reap);
1550 INIT_DELAYED_WORK(&priv->cm.stale_task, ipoib_cm_stale_task);
1551
1552 skb_queue_head_init(&priv->cm.skb_queue);
1553
1554 ret = ib_query_device(priv->ca, &attr);
1555 if (ret) {
1556 printk(KERN_WARNING "ib_query_device() failed with %d\n", ret);
1557 return ret;
1558 }
1559
1560 ipoib_dbg(priv, "max_srq_sge=%d\n", attr.max_srq_sge);
1561
1562 attr.max_srq_sge = min_t(int, IPOIB_CM_RX_SG, attr.max_srq_sge);
1563 ipoib_cm_create_srq(dev, attr.max_srq_sge);
1564 if (ipoib_cm_has_srq(dev)) {
1565 priv->cm.max_cm_mtu = attr.max_srq_sge * PAGE_SIZE - 0x10;
1566 priv->cm.num_frags = attr.max_srq_sge;
1567 ipoib_dbg(priv, "max_cm_mtu = 0x%x, num_frags=%d\n",
1568 priv->cm.max_cm_mtu, priv->cm.num_frags);
1569 } else {
1570 priv->cm.max_cm_mtu = IPOIB_CM_MTU;
1571 priv->cm.num_frags = IPOIB_CM_RX_SG;
1572 }
1573
1574 ipoib_cm_init_rx_wr(dev, &priv->cm.rx_wr, priv->cm.rx_sge);
1575
1576 if (ipoib_cm_has_srq(dev)) {
1577 for (i = 0; i < ipoib_recvq_size; ++i) {
1578 if (!ipoib_cm_alloc_rx_skb(dev, priv->cm.srq_ring, i,
1579 priv->cm.num_frags - 1,
1580 priv->cm.srq_ring[i].mapping)) {
1581 ipoib_warn(priv, "failed to allocate "
1582 "receive buffer %d\n", i);
1583 ipoib_cm_dev_cleanup(dev);
1584 return -ENOMEM;
1585 }
1586
1587 if (ipoib_cm_post_receive_srq(dev, i)) {
1588 ipoib_warn(priv, "ipoib_cm_post_receive_srq "
1589 "failed for buf %d\n", i);
1590 ipoib_cm_dev_cleanup(dev);
1591 return -EIO;
1592 }
1593 }
1594 }
1595
1596 priv->dev->dev_addr[0] = IPOIB_FLAGS_RC;
1597 return 0;
1598 }
1599
1600 void ipoib_cm_dev_cleanup(struct net_device *dev)
1601 {
1602 struct ipoib_dev_priv *priv = netdev_priv(dev);
1603 int ret;
1604
1605 if (!priv->cm.srq)
1606 return;
1607
1608 ipoib_dbg(priv, "Cleanup ipoib connected mode.\n");
1609
1610 ret = ib_destroy_srq(priv->cm.srq);
1611 if (ret)
1612 ipoib_warn(priv, "ib_destroy_srq failed: %d\n", ret);
1613
1614 priv->cm.srq = NULL;
1615 if (!priv->cm.srq_ring)
1616 return;
1617
1618 ipoib_cm_free_rx_ring(dev, priv->cm.srq_ring);
1619 priv->cm.srq_ring = NULL;
1620 }
kernel source for telekom puls (alcatel/mediatek)