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RT-AC66 3.0.0.4.374.130 core
[tomato.git] / release / src-rt-6.x / linux / linux-2.6 / drivers / infiniband / ulp / ipoib / ipoib_cm.c
blobea74d1eaf0046c15c78e6a819067b8743a572a71
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 * $Id$
33 */
34
35 #include <rdma/ib_cm.h>
36 #include <rdma/ib_cache.h>
37 #include <net/dst.h>
38 #include <net/icmp.h>
39 #include <linux/icmpv6.h>
40 #include <linux/delay.h>
41
42 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG_DATA
43 static int data_debug_level;
44
45 module_param_named(cm_data_debug_level, data_debug_level, int, 0644);
46 MODULE_PARM_DESC(cm_data_debug_level,
47 "Enable data path debug tracing for connected mode if > 0");
48 #endif
49
50 #include "ipoib.h"
51
52 #define IPOIB_CM_IETF_ID 0x1000000000000000ULL
53
54 #define IPOIB_CM_RX_UPDATE_TIME (256 * HZ)
55 #define IPOIB_CM_RX_TIMEOUT (2 * 256 * HZ)
56 #define IPOIB_CM_RX_DELAY (3 * 256 * HZ)
57 #define IPOIB_CM_RX_UPDATE_MASK (0x3)
58
59 static struct ib_qp_attr ipoib_cm_err_attr = {
60 .qp_state = IB_QPS_ERR
61 };
62
63 #define IPOIB_CM_RX_DRAIN_WRID 0x7fffffff
64
65 static struct ib_send_wr ipoib_cm_rx_drain_wr = {
66 .wr_id = IPOIB_CM_RX_DRAIN_WRID,
67 .opcode = IB_WR_SEND,
68 };
69
70 static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id,
71 struct ib_cm_event *event);
72
73 static void ipoib_cm_dma_unmap_rx(struct ipoib_dev_priv *priv, int frags,
74 u64 mapping[IPOIB_CM_RX_SG])
75 {
76 int i;
77
78 ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_CM_HEAD_SIZE, DMA_FROM_DEVICE);
79
80 for (i = 0; i < frags; ++i)
81 ib_dma_unmap_single(priv->ca, mapping[i + 1], PAGE_SIZE, DMA_FROM_DEVICE);
82 }
83
84 static int ipoib_cm_post_receive(struct net_device *dev, int id)
85 {
86 struct ipoib_dev_priv *priv = netdev_priv(dev);
87 struct ib_recv_wr *bad_wr;
88 int i, ret;
89
90 priv->cm.rx_wr.wr_id = id | IPOIB_CM_OP_SRQ;
91
92 for (i = 0; i < IPOIB_CM_RX_SG; ++i)
93 priv->cm.rx_sge[i].addr = priv->cm.srq_ring[id].mapping[i];
94
95 ret = ib_post_srq_recv(priv->cm.srq, &priv->cm.rx_wr, &bad_wr);
96 if (unlikely(ret)) {
97 ipoib_warn(priv, "post srq failed for buf %d (%d)\n", id, ret);
98 ipoib_cm_dma_unmap_rx(priv, IPOIB_CM_RX_SG - 1,
99 priv->cm.srq_ring[id].mapping);
100 dev_kfree_skb_any(priv->cm.srq_ring[id].skb);
101 priv->cm.srq_ring[id].skb = NULL;
102 }
103
104 return ret;
105 }
106
107 static struct sk_buff *ipoib_cm_alloc_rx_skb(struct net_device *dev, int id, int frags,
108 u64 mapping[IPOIB_CM_RX_SG])
109 {
110 struct ipoib_dev_priv *priv = netdev_priv(dev);
111 struct sk_buff *skb;
112 int i;
113
114 skb = dev_alloc_skb(IPOIB_CM_HEAD_SIZE + 12);
115 if (unlikely(!skb))
116 return NULL;
117
118 /*
119 * IPoIB adds a 4 byte header. So we need 12 more bytes to align the
120 * IP header to a multiple of 16.
121 */
122 skb_reserve(skb, 12);
123
124 mapping[0] = ib_dma_map_single(priv->ca, skb->data, IPOIB_CM_HEAD_SIZE,
125 DMA_FROM_DEVICE);
126 if (unlikely(ib_dma_mapping_error(priv->ca, mapping[0]))) {
127 dev_kfree_skb_any(skb);
128 return NULL;
129 }
130
131 for (i = 0; i < frags; i++) {
132 struct page *page = alloc_page(GFP_ATOMIC);
133
134 if (!page)
135 goto partial_error;
136 skb_fill_page_desc(skb, i, page, 0, PAGE_SIZE);
137
138 mapping[i + 1] = ib_dma_map_page(priv->ca, skb_shinfo(skb)->frags[i].page,
139 0, PAGE_SIZE, DMA_FROM_DEVICE);
140 if (unlikely(ib_dma_mapping_error(priv->ca, mapping[i + 1])))
141 goto partial_error;
142 }
143
144 priv->cm.srq_ring[id].skb = skb;
145 return skb;
146
147 partial_error:
148
149 ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_CM_HEAD_SIZE, DMA_FROM_DEVICE);
150
151 for (; i > 0; --i)
152 ib_dma_unmap_single(priv->ca, mapping[i], PAGE_SIZE, DMA_FROM_DEVICE);
153
154 dev_kfree_skb_any(skb);
155 return NULL;
156 }
157
158 static void ipoib_cm_start_rx_drain(struct ipoib_dev_priv* priv)
159 {
160 struct ib_send_wr *bad_wr;
161 struct ipoib_cm_rx *p;
162
163 /* We only reserved 1 extra slot in CQ for drain WRs, so
164 * make sure we have at most 1 outstanding WR. */
165 if (list_empty(&priv->cm.rx_flush_list) ||
166 !list_empty(&priv->cm.rx_drain_list))
167 return;
168
169 /*
170 * QPs on flush list are error state. This way, a "flush
171 * error" WC will be immediately generated for each WR we post.
172 */
173 p = list_entry(priv->cm.rx_flush_list.next, typeof(*p), list);
174 if (ib_post_send(p->qp, &ipoib_cm_rx_drain_wr, &bad_wr))
175 ipoib_warn(priv, "failed to post drain wr\n");
176
177 list_splice_init(&priv->cm.rx_flush_list, &priv->cm.rx_drain_list);
178 }
179
180 static void ipoib_cm_rx_event_handler(struct ib_event *event, void *ctx)
181 {
182 struct ipoib_cm_rx *p = ctx;
183 struct ipoib_dev_priv *priv = netdev_priv(p->dev);
184 unsigned long flags;
185
186 if (event->event != IB_EVENT_QP_LAST_WQE_REACHED)
187 return;
188
189 spin_lock_irqsave(&priv->lock, flags);
190 list_move(&p->list, &priv->cm.rx_flush_list);
191 p->state = IPOIB_CM_RX_FLUSH;
192 ipoib_cm_start_rx_drain(priv);
193 spin_unlock_irqrestore(&priv->lock, flags);
194 }
195
196 static struct ib_qp *ipoib_cm_create_rx_qp(struct net_device *dev,
197 struct ipoib_cm_rx *p)
198 {
199 struct ipoib_dev_priv *priv = netdev_priv(dev);
200 struct ib_qp_init_attr attr = {
201 .event_handler = ipoib_cm_rx_event_handler,
202 .send_cq = priv->cq, /* For drain WR */
203 .recv_cq = priv->cq,
204 .srq = priv->cm.srq,
205 .cap.max_send_wr = 1, /* For drain WR */
206 .cap.max_send_sge = 1, /* FIXME: 0 Seems not to work */
207 .sq_sig_type = IB_SIGNAL_ALL_WR,
208 .qp_type = IB_QPT_RC,
209 .qp_context = p,
210 };
211 return ib_create_qp(priv->pd, &attr);
212 }
213
214 static int ipoib_cm_modify_rx_qp(struct net_device *dev,
215 struct ib_cm_id *cm_id, struct ib_qp *qp,
216 unsigned psn)
217 {
218 struct ipoib_dev_priv *priv = netdev_priv(dev);
219 struct ib_qp_attr qp_attr;
220 int qp_attr_mask, ret;
221
222 qp_attr.qp_state = IB_QPS_INIT;
223 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
224 if (ret) {
225 ipoib_warn(priv, "failed to init QP attr for INIT: %d\n", ret);
226 return ret;
227 }
228 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
229 if (ret) {
230 ipoib_warn(priv, "failed to modify QP to INIT: %d\n", ret);
231 return ret;
232 }
233 qp_attr.qp_state = IB_QPS_RTR;
234 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
235 if (ret) {
236 ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret);
237 return ret;
238 }
239 qp_attr.rq_psn = psn;
240 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
241 if (ret) {
242 ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret);
243 return ret;
244 }
245
246 /*
247 * Current Mellanox HCA firmware won't generate completions
248 * with error for drain WRs unless the QP has been moved to
249 * RTS first. This work-around leaves a window where a QP has
250 * moved to error asynchronously, but this will eventually get
251 * fixed in firmware, so let's not error out if modify QP
252 * fails.
253 */
254 qp_attr.qp_state = IB_QPS_RTS;
255 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
256 if (ret) {
257 ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret);
258 return 0;
259 }
260 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
261 if (ret) {
262 ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret);
263 return 0;
264 }
265
266 return 0;
267 }
268
269 static int ipoib_cm_send_rep(struct net_device *dev, struct ib_cm_id *cm_id,
270 struct ib_qp *qp, struct ib_cm_req_event_param *req,
271 unsigned psn)
272 {
273 struct ipoib_dev_priv *priv = netdev_priv(dev);
274 struct ipoib_cm_data data = {};
275 struct ib_cm_rep_param rep = {};
276
277 data.qpn = cpu_to_be32(priv->qp->qp_num);
278 data.mtu = cpu_to_be32(IPOIB_CM_BUF_SIZE);
279
280 rep.private_data = &data;
281 rep.private_data_len = sizeof data;
282 rep.flow_control = 0;
283 rep.rnr_retry_count = req->rnr_retry_count;
284 rep.target_ack_delay = 20; /* FIXME */
285 rep.srq = 1;
286 rep.qp_num = qp->qp_num;
287 rep.starting_psn = psn;
288 return ib_send_cm_rep(cm_id, &rep);
289 }
290
291 static int ipoib_cm_req_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
292 {
293 struct net_device *dev = cm_id->context;
294 struct ipoib_dev_priv *priv = netdev_priv(dev);
295 struct ipoib_cm_rx *p;
296 unsigned psn;
297 int ret;
298
299 ipoib_dbg(priv, "REQ arrived\n");
300 p = kzalloc(sizeof *p, GFP_KERNEL);
301 if (!p)
302 return -ENOMEM;
303 p->dev = dev;
304 p->id = cm_id;
305 cm_id->context = p;
306 p->state = IPOIB_CM_RX_LIVE;
307 p->jiffies = jiffies;
308 INIT_LIST_HEAD(&p->list);
309
310 p->qp = ipoib_cm_create_rx_qp(dev, p);
311 if (IS_ERR(p->qp)) {
312 ret = PTR_ERR(p->qp);
313 goto err_qp;
314 }
315
316 psn = random32() & 0xffffff;
317 ret = ipoib_cm_modify_rx_qp(dev, cm_id, p->qp, psn);
318 if (ret)
319 goto err_modify;
320
321 spin_lock_irq(&priv->lock);
322 queue_delayed_work(ipoib_workqueue,
323 &priv->cm.stale_task, IPOIB_CM_RX_DELAY);
324 /* Add this entry to passive ids list head, but do not re-add it
325 * if IB_EVENT_QP_LAST_WQE_REACHED has moved it to flush list. */
326 p->jiffies = jiffies;
327 if (p->state == IPOIB_CM_RX_LIVE)
328 list_move(&p->list, &priv->cm.passive_ids);
329 spin_unlock_irq(&priv->lock);
330
331 ret = ipoib_cm_send_rep(dev, cm_id, p->qp, &event->param.req_rcvd, psn);
332 if (ret) {
333 ipoib_warn(priv, "failed to send REP: %d\n", ret);
334 if (ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE))
335 ipoib_warn(priv, "unable to move qp to error state\n");
336 }
337 return 0;
338
339 err_modify:
340 ib_destroy_qp(p->qp);
341 err_qp:
342 kfree(p);
343 return ret;
344 }
345
346 static int ipoib_cm_rx_handler(struct ib_cm_id *cm_id,
347 struct ib_cm_event *event)
348 {
349 struct ipoib_cm_rx *p;
350 struct ipoib_dev_priv *priv;
351
352 switch (event->event) {
353 case IB_CM_REQ_RECEIVED:
354 return ipoib_cm_req_handler(cm_id, event);
355 case IB_CM_DREQ_RECEIVED:
356 p = cm_id->context;
357 ib_send_cm_drep(cm_id, NULL, 0);
358 /* Fall through */
359 case IB_CM_REJ_RECEIVED:
360 p = cm_id->context;
361 priv = netdev_priv(p->dev);
362 if (ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE))
363 ipoib_warn(priv, "unable to move qp to error state\n");
364 /* Fall through */
365 default:
366 return 0;
367 }
368 }
369 /* Adjust length of skb with fragments to match received data */
370 static void skb_put_frags(struct sk_buff *skb, unsigned int hdr_space,
371 unsigned int length, struct sk_buff *toskb)
372 {
373 int i, num_frags;
374 unsigned int size;
375
376 /* put header into skb */
377 size = min(length, hdr_space);
378 skb->tail += size;
379 skb->len += size;
380 length -= size;
381
382 num_frags = skb_shinfo(skb)->nr_frags;
383 for (i = 0; i < num_frags; i++) {
384 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
385
386 if (length == 0) {
387 /* don't need this page */
388 skb_fill_page_desc(toskb, i, frag->page, 0, PAGE_SIZE);
389 --skb_shinfo(skb)->nr_frags;
390 } else {
391 size = min(length, (unsigned) PAGE_SIZE);
392
393 frag->size = size;
394 skb->data_len += size;
395 skb->truesize += size;
396 skb->len += size;
397 length -= size;
398 }
399 }
400 }
401
402 void ipoib_cm_handle_rx_wc(struct net_device *dev, struct ib_wc *wc)
403 {
404 struct ipoib_dev_priv *priv = netdev_priv(dev);
405 unsigned int wr_id = wc->wr_id & ~IPOIB_CM_OP_SRQ;
406 struct sk_buff *skb, *newskb;
407 struct ipoib_cm_rx *p;
408 unsigned long flags;
409 u64 mapping[IPOIB_CM_RX_SG];
410 int frags;
411
412 ipoib_dbg_data(priv, "cm recv completion: id %d, status: %d\n",
413 wr_id, wc->status);
414
415 if (unlikely(wr_id >= ipoib_recvq_size)) {
416 if (wr_id == (IPOIB_CM_RX_DRAIN_WRID & ~IPOIB_CM_OP_SRQ)) {
417 spin_lock_irqsave(&priv->lock, flags);
418 list_splice_init(&priv->cm.rx_drain_list, &priv->cm.rx_reap_list);
419 ipoib_cm_start_rx_drain(priv);
420 queue_work(ipoib_workqueue, &priv->cm.rx_reap_task);
421 spin_unlock_irqrestore(&priv->lock, flags);
422 } else
423 ipoib_warn(priv, "cm recv completion event with wrid %d (> %d)\n",
424 wr_id, ipoib_recvq_size);
425 return;
426 }
427
428 skb = priv->cm.srq_ring[wr_id].skb;
429
430 if (unlikely(wc->status != IB_WC_SUCCESS)) {
431 ipoib_dbg(priv, "cm recv error "
432 "(status=%d, wrid=%d vend_err %x)\n",
433 wc->status, wr_id, wc->vendor_err);
434 ++priv->stats.rx_dropped;
435 goto repost;
436 }
437
438 if (!likely(wr_id & IPOIB_CM_RX_UPDATE_MASK)) {
439 p = wc->qp->qp_context;
440 if (p && time_after_eq(jiffies, p->jiffies + IPOIB_CM_RX_UPDATE_TIME)) {
441 spin_lock_irqsave(&priv->lock, flags);
442 p->jiffies = jiffies;
443 /* Move this entry to list head, but do not re-add it
444 * if it has been moved out of list. */
445 if (p->state == IPOIB_CM_RX_LIVE)
446 list_move(&p->list, &priv->cm.passive_ids);
447 spin_unlock_irqrestore(&priv->lock, flags);
448 }
449 }
450
451 frags = PAGE_ALIGN(wc->byte_len - min(wc->byte_len,
452 (unsigned)IPOIB_CM_HEAD_SIZE)) / PAGE_SIZE;
453
454 newskb = ipoib_cm_alloc_rx_skb(dev, wr_id, frags, mapping);
455 if (unlikely(!newskb)) {
456 /*
457 * If we can't allocate a new RX buffer, dump
458 * this packet and reuse the old buffer.
459 */
460 ipoib_dbg(priv, "failed to allocate receive buffer %d\n", wr_id);
461 ++priv->stats.rx_dropped;
462 goto repost;
463 }
464
465 ipoib_cm_dma_unmap_rx(priv, frags, priv->cm.srq_ring[wr_id].mapping);
466 memcpy(priv->cm.srq_ring[wr_id].mapping, mapping, (frags + 1) * sizeof *mapping);
467
468 ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n",
469 wc->byte_len, wc->slid);
470
471 skb_put_frags(skb, IPOIB_CM_HEAD_SIZE, wc->byte_len, newskb);
472
473 skb->protocol = ((struct ipoib_header *) skb->data)->proto;
474 skb_reset_mac_header(skb);
475 skb_pull(skb, IPOIB_ENCAP_LEN);
476
477 dev->last_rx = jiffies;
478 ++priv->stats.rx_packets;
479 priv->stats.rx_bytes += skb->len;
480
481 skb->dev = dev;
482 /* XXX get correct PACKET_ type here */
483 skb->pkt_type = PACKET_HOST;
484 netif_receive_skb(skb);
485
486 repost:
487 if (unlikely(ipoib_cm_post_receive(dev, wr_id)))
488 ipoib_warn(priv, "ipoib_cm_post_receive failed "
489 "for buf %d\n", wr_id);
490 }
491
492 static inline int post_send(struct ipoib_dev_priv *priv,
493 struct ipoib_cm_tx *tx,
494 unsigned int wr_id,
495 u64 addr, int len)
496 {
497 struct ib_send_wr *bad_wr;
498
499 priv->tx_sge.addr = addr;
500 priv->tx_sge.length = len;
501
502 priv->tx_wr.wr_id = wr_id;
503
504 return ib_post_send(tx->qp, &priv->tx_wr, &bad_wr);
505 }
506
507 void ipoib_cm_send(struct net_device *dev, struct sk_buff *skb, struct ipoib_cm_tx *tx)
508 {
509 struct ipoib_dev_priv *priv = netdev_priv(dev);
510 struct ipoib_tx_buf *tx_req;
511 u64 addr;
512
513 if (unlikely(skb->len > tx->mtu)) {
514 ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n",
515 skb->len, tx->mtu);
516 ++priv->stats.tx_dropped;
517 ++priv->stats.tx_errors;
518 ipoib_cm_skb_too_long(dev, skb, tx->mtu - IPOIB_ENCAP_LEN);
519 return;
520 }
521
522 ipoib_dbg_data(priv, "sending packet: head 0x%x length %d connection 0x%x\n",
523 tx->tx_head, skb->len, tx->qp->qp_num);
524
525 /*
526 * We put the skb into the tx_ring _before_ we call post_send()
527 * because it's entirely possible that the completion handler will
528 * run before we execute anything after the post_send(). That
529 * means we have to make sure everything is properly recorded and
530 * our state is consistent before we call post_send().
531 */
532 tx_req = &tx->tx_ring[tx->tx_head & (ipoib_sendq_size - 1)];
533 tx_req->skb = skb;
534 addr = ib_dma_map_single(priv->ca, skb->data, skb->len, DMA_TO_DEVICE);
535 if (unlikely(ib_dma_mapping_error(priv->ca, addr))) {
536 ++priv->stats.tx_errors;
537 dev_kfree_skb_any(skb);
538 return;
539 }
540
541 tx_req->mapping = addr;
542
543 if (unlikely(post_send(priv, tx, tx->tx_head & (ipoib_sendq_size - 1),
544 addr, skb->len))) {
545 ipoib_warn(priv, "post_send failed\n");
546 ++priv->stats.tx_errors;
547 ib_dma_unmap_single(priv->ca, addr, skb->len, DMA_TO_DEVICE);
548 dev_kfree_skb_any(skb);
549 } else {
550 dev->trans_start = jiffies;
551 ++tx->tx_head;
552
553 if (tx->tx_head - tx->tx_tail == ipoib_sendq_size) {
554 ipoib_dbg(priv, "TX ring 0x%x full, stopping kernel net queue\n",
555 tx->qp->qp_num);
556 netif_stop_queue(dev);
557 set_bit(IPOIB_FLAG_NETIF_STOPPED, &tx->flags);
558 }
559 }
560 }
561
562 static void ipoib_cm_handle_tx_wc(struct net_device *dev, struct ipoib_cm_tx *tx,
563 struct ib_wc *wc)
564 {
565 struct ipoib_dev_priv *priv = netdev_priv(dev);
566 unsigned int wr_id = wc->wr_id;
567 struct ipoib_tx_buf *tx_req;
568 unsigned long flags;
569
570 ipoib_dbg_data(priv, "cm send completion: id %d, status: %d\n",
571 wr_id, wc->status);
572
573 if (unlikely(wr_id >= ipoib_sendq_size)) {
574 ipoib_warn(priv, "cm send completion event with wrid %d (> %d)\n",
575 wr_id, ipoib_sendq_size);
576 return;
577 }
578
579 tx_req = &tx->tx_ring[wr_id];
580
581 ib_dma_unmap_single(priv->ca, tx_req->mapping, tx_req->skb->len, DMA_TO_DEVICE);
582
583 /* FIXME: is this right? Shouldn't we only increment on success? */
584 ++priv->stats.tx_packets;
585 priv->stats.tx_bytes += tx_req->skb->len;
586
587 dev_kfree_skb_any(tx_req->skb);
588
589 spin_lock_irqsave(&priv->tx_lock, flags);
590 ++tx->tx_tail;
591 if (unlikely(test_bit(IPOIB_FLAG_NETIF_STOPPED, &tx->flags)) &&
592 tx->tx_head - tx->tx_tail <= ipoib_sendq_size >> 1) {
593 clear_bit(IPOIB_FLAG_NETIF_STOPPED, &tx->flags);
594 netif_wake_queue(dev);
595 }
596
597 if (wc->status != IB_WC_SUCCESS &&
598 wc->status != IB_WC_WR_FLUSH_ERR) {
599 struct ipoib_neigh *neigh;
600
601 ipoib_dbg(priv, "failed cm send event "
602 "(status=%d, wrid=%d vend_err %x)\n",
603 wc->status, wr_id, wc->vendor_err);
604
605 spin_lock(&priv->lock);
606 neigh = tx->neigh;
607
608 if (neigh) {
609 neigh->cm = NULL;
610 list_del(&neigh->list);
611 if (neigh->ah)
612 ipoib_put_ah(neigh->ah);
613 ipoib_neigh_free(dev, neigh);
614
615 tx->neigh = NULL;
616 }
617
618 /* queue would be re-started anyway when TX is destroyed,
619 * but it makes sense to do it ASAP here. */
620 if (test_and_clear_bit(IPOIB_FLAG_NETIF_STOPPED, &tx->flags))
621 netif_wake_queue(dev);
622
623 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
624 list_move(&tx->list, &priv->cm.reap_list);
625 queue_work(ipoib_workqueue, &priv->cm.reap_task);
626 }
627
628 clear_bit(IPOIB_FLAG_OPER_UP, &tx->flags);
629
630 spin_unlock(&priv->lock);
631 }
632
633 spin_unlock_irqrestore(&priv->tx_lock, flags);
634 }
635
636 static void ipoib_cm_tx_completion(struct ib_cq *cq, void *tx_ptr)
637 {
638 struct ipoib_cm_tx *tx = tx_ptr;
639 int n, i;
640
641 ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
642 do {
643 n = ib_poll_cq(cq, IPOIB_NUM_WC, tx->ibwc);
644 for (i = 0; i < n; ++i)
645 ipoib_cm_handle_tx_wc(tx->dev, tx, tx->ibwc + i);
646 } while (n == IPOIB_NUM_WC);
647 }
648
649 int ipoib_cm_dev_open(struct net_device *dev)
650 {
651 struct ipoib_dev_priv *priv = netdev_priv(dev);
652 int ret;
653
654 if (!IPOIB_CM_SUPPORTED(dev->dev_addr))
655 return 0;
656
657 priv->cm.id = ib_create_cm_id(priv->ca, ipoib_cm_rx_handler, dev);
658 if (IS_ERR(priv->cm.id)) {
659 printk(KERN_WARNING "%s: failed to create CM ID\n", priv->ca->name);
660 ret = PTR_ERR(priv->cm.id);
661 goto err_cm;
662 }
663
664 ret = ib_cm_listen(priv->cm.id, cpu_to_be64(IPOIB_CM_IETF_ID | priv->qp->qp_num),
665 0, NULL);
666 if (ret) {
667 printk(KERN_WARNING "%s: failed to listen on ID 0x%llx\n", priv->ca->name,
668 IPOIB_CM_IETF_ID | priv->qp->qp_num);
669 goto err_listen;
670 }
671
672 return 0;
673
674 err_listen:
675 ib_destroy_cm_id(priv->cm.id);
676 err_cm:
677 priv->cm.id = NULL;
678 return ret;
679 }
680
681 void ipoib_cm_dev_stop(struct net_device *dev)
682 {
683 struct ipoib_dev_priv *priv = netdev_priv(dev);
684 struct ipoib_cm_rx *p, *n;
685 unsigned long begin;
686 LIST_HEAD(list);
687 int ret;
688
689 if (!IPOIB_CM_SUPPORTED(dev->dev_addr) || !priv->cm.id)
690 return;
691
692 ib_destroy_cm_id(priv->cm.id);
693 priv->cm.id = NULL;
694
695 spin_lock_irq(&priv->lock);
696 while (!list_empty(&priv->cm.passive_ids)) {
697 p = list_entry(priv->cm.passive_ids.next, typeof(*p), list);
698 list_move(&p->list, &priv->cm.rx_error_list);
699 p->state = IPOIB_CM_RX_ERROR;
700 spin_unlock_irq(&priv->lock);
701 ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE);
702 if (ret)
703 ipoib_warn(priv, "unable to move qp to error state: %d\n", ret);
704 spin_lock_irq(&priv->lock);
705 }
706
707 /* Wait for all RX to be drained */
708 begin = jiffies;
709
710 while (!list_empty(&priv->cm.rx_error_list) ||
711 !list_empty(&priv->cm.rx_flush_list) ||
712 !list_empty(&priv->cm.rx_drain_list)) {
713 if (time_after(jiffies, begin + 5 * HZ)) {
714 ipoib_warn(priv, "RX drain timing out\n");
715
716 /*
717 * assume the HW is wedged and just free up everything.
718 */
719 list_splice_init(&priv->cm.rx_flush_list, &list);
720 list_splice_init(&priv->cm.rx_error_list, &list);
721 list_splice_init(&priv->cm.rx_drain_list, &list);
722 break;
723 }
724 spin_unlock_irq(&priv->lock);
725 msleep(1);
726 ipoib_drain_cq(dev);
727 spin_lock_irq(&priv->lock);
728 }
729
730 list_splice_init(&priv->cm.rx_reap_list, &list);
731
732 spin_unlock_irq(&priv->lock);
733
734 list_for_each_entry_safe(p, n, &list, list) {
735 ib_destroy_cm_id(p->id);
736 ib_destroy_qp(p->qp);
737 kfree(p);
738 }
739
740 cancel_delayed_work(&priv->cm.stale_task);
741 }
742
743 static int ipoib_cm_rep_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
744 {
745 struct ipoib_cm_tx *p = cm_id->context;
746 struct ipoib_dev_priv *priv = netdev_priv(p->dev);
747 struct ipoib_cm_data *data = event->private_data;
748 struct sk_buff_head skqueue;
749 struct ib_qp_attr qp_attr;
750 int qp_attr_mask, ret;
751 struct sk_buff *skb;
752
753 p->mtu = be32_to_cpu(data->mtu);
754
755 if (p->mtu <= IPOIB_ENCAP_LEN) {
756 ipoib_warn(priv, "Rejecting connection: mtu %d <= %d\n",
757 p->mtu, IPOIB_ENCAP_LEN);
758 return -EINVAL;
759 }
760
761 qp_attr.qp_state = IB_QPS_RTR;
762 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
763 if (ret) {
764 ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret);
765 return ret;
766 }
767
768 qp_attr.rq_psn = 0 /* FIXME */;
769 ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask);
770 if (ret) {
771 ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret);
772 return ret;
773 }
774
775 qp_attr.qp_state = IB_QPS_RTS;
776 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
777 if (ret) {
778 ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret);
779 return ret;
780 }
781 ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask);
782 if (ret) {
783 ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret);
784 return ret;
785 }
786
787 skb_queue_head_init(&skqueue);
788
789 spin_lock_irq(&priv->lock);
790 set_bit(IPOIB_FLAG_OPER_UP, &p->flags);
791 if (p->neigh)
792 while ((skb = __skb_dequeue(&p->neigh->queue)))
793 __skb_queue_tail(&skqueue, skb);
794 spin_unlock_irq(&priv->lock);
795
796 while ((skb = __skb_dequeue(&skqueue))) {
797 skb->dev = p->dev;
798 if (dev_queue_xmit(skb))
799 ipoib_warn(priv, "dev_queue_xmit failed "
800 "to requeue packet\n");
801 }
802
803 ret = ib_send_cm_rtu(cm_id, NULL, 0);
804 if (ret) {
805 ipoib_warn(priv, "failed to send RTU: %d\n", ret);
806 return ret;
807 }
808 return 0;
809 }
810
811 static struct ib_qp *ipoib_cm_create_tx_qp(struct net_device *dev, struct ib_cq *cq)
812 {
813 struct ipoib_dev_priv *priv = netdev_priv(dev);
814 struct ib_qp_init_attr attr = {};
815 attr.recv_cq = priv->cq;
816 attr.srq = priv->cm.srq;
817 attr.cap.max_send_wr = ipoib_sendq_size;
818 attr.cap.max_send_sge = 1;
819 attr.sq_sig_type = IB_SIGNAL_ALL_WR;
820 attr.qp_type = IB_QPT_RC;
821 attr.send_cq = cq;
822 return ib_create_qp(priv->pd, &attr);
823 }
824
825 static int ipoib_cm_send_req(struct net_device *dev,
826 struct ib_cm_id *id, struct ib_qp *qp,
827 u32 qpn,
828 struct ib_sa_path_rec *pathrec)
829 {
830 struct ipoib_dev_priv *priv = netdev_priv(dev);
831 struct ipoib_cm_data data = {};
832 struct ib_cm_req_param req = {};
833
834 data.qpn = cpu_to_be32(priv->qp->qp_num);
835 data.mtu = cpu_to_be32(IPOIB_CM_BUF_SIZE);
836
837 req.primary_path = pathrec;
838 req.alternate_path = NULL;
839 req.service_id = cpu_to_be64(IPOIB_CM_IETF_ID | qpn);
840 req.qp_num = qp->qp_num;
841 req.qp_type = qp->qp_type;
842 req.private_data = &data;
843 req.private_data_len = sizeof data;
844 req.flow_control = 0;
845
846 req.starting_psn = 0; /* FIXME */
847
848 /*
849 * Pick some arbitrary defaults here; we could make these
850 * module parameters if anyone cared about setting them.
851 */
852 req.responder_resources = 4;
853 req.remote_cm_response_timeout = 20;
854 req.local_cm_response_timeout = 20;
855 req.retry_count = 0; /* RFC draft warns against retries */
856 req.rnr_retry_count = 0; /* RFC draft warns against retries */
857 req.max_cm_retries = 15;
858 req.srq = 1;
859 return ib_send_cm_req(id, &req);
860 }
861
862 static int ipoib_cm_modify_tx_init(struct net_device *dev,
863 struct ib_cm_id *cm_id, struct ib_qp *qp)
864 {
865 struct ipoib_dev_priv *priv = netdev_priv(dev);
866 struct ib_qp_attr qp_attr;
867 int qp_attr_mask, ret;
868 ret = ib_find_cached_pkey(priv->ca, priv->port, priv->pkey, &qp_attr.pkey_index);
869 if (ret) {
870 ipoib_warn(priv, "pkey 0x%x not in cache: %d\n", priv->pkey, ret);
871 return ret;
872 }
873
874 qp_attr.qp_state = IB_QPS_INIT;
875 qp_attr.qp_access_flags = IB_ACCESS_LOCAL_WRITE;
876 qp_attr.port_num = priv->port;
877 qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS | IB_QP_PKEY_INDEX | IB_QP_PORT;
878
879 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
880 if (ret) {
881 ipoib_warn(priv, "failed to modify tx QP to INIT: %d\n", ret);
882 return ret;
883 }
884 return 0;
885 }
886
887 static int ipoib_cm_tx_init(struct ipoib_cm_tx *p, u32 qpn,
888 struct ib_sa_path_rec *pathrec)
889 {
890 struct ipoib_dev_priv *priv = netdev_priv(p->dev);
891 int ret;
892
893 p->tx_ring = kzalloc(ipoib_sendq_size * sizeof *p->tx_ring,
894 GFP_KERNEL);
895 if (!p->tx_ring) {
896 ipoib_warn(priv, "failed to allocate tx ring\n");
897 ret = -ENOMEM;
898 goto err_tx;
899 }
900
901 p->cq = ib_create_cq(priv->ca, ipoib_cm_tx_completion, NULL, p,
902 ipoib_sendq_size + 1, 0);
903 if (IS_ERR(p->cq)) {
904 ret = PTR_ERR(p->cq);
905 ipoib_warn(priv, "failed to allocate tx cq: %d\n", ret);
906 goto err_cq;
907 }
908
909 ret = ib_req_notify_cq(p->cq, IB_CQ_NEXT_COMP);
910 if (ret) {
911 ipoib_warn(priv, "failed to request completion notification: %d\n", ret);
912 goto err_req_notify;
913 }
914
915 p->qp = ipoib_cm_create_tx_qp(p->dev, p->cq);
916 if (IS_ERR(p->qp)) {
917 ret = PTR_ERR(p->qp);
918 ipoib_warn(priv, "failed to allocate tx qp: %d\n", ret);
919 goto err_qp;
920 }
921
922 p->id = ib_create_cm_id(priv->ca, ipoib_cm_tx_handler, p);
923 if (IS_ERR(p->id)) {
924 ret = PTR_ERR(p->id);
925 ipoib_warn(priv, "failed to create tx cm id: %d\n", ret);
926 goto err_id;
927 }
928
929 ret = ipoib_cm_modify_tx_init(p->dev, p->id, p->qp);
930 if (ret) {
931 ipoib_warn(priv, "failed to modify tx qp to rtr: %d\n", ret);
932 goto err_modify;
933 }
934
935 ret = ipoib_cm_send_req(p->dev, p->id, p->qp, qpn, pathrec);
936 if (ret) {
937 ipoib_warn(priv, "failed to send cm req: %d\n", ret);
938 goto err_send_cm;
939 }
940
941 ipoib_dbg(priv, "Request connection 0x%x for gid " IPOIB_GID_FMT " qpn 0x%x\n",
942 p->qp->qp_num, IPOIB_GID_ARG(pathrec->dgid), qpn);
943
944 return 0;
945
946 err_send_cm:
947 err_modify:
948 ib_destroy_cm_id(p->id);
949 err_id:
950 p->id = NULL;
951 ib_destroy_qp(p->qp);
952 err_req_notify:
953 err_qp:
954 p->qp = NULL;
955 ib_destroy_cq(p->cq);
956 err_cq:
957 p->cq = NULL;
958 err_tx:
959 return ret;
960 }
961
962 static void ipoib_cm_tx_destroy(struct ipoib_cm_tx *p)
963 {
964 struct ipoib_dev_priv *priv = netdev_priv(p->dev);
965 struct ipoib_tx_buf *tx_req;
966
967 ipoib_dbg(priv, "Destroy active connection 0x%x head 0x%x tail 0x%x\n",
968 p->qp ? p->qp->qp_num : 0, p->tx_head, p->tx_tail);
969
970 if (p->id)
971 ib_destroy_cm_id(p->id);
972
973 if (p->qp)
974 ib_destroy_qp(p->qp);
975
976 if (p->cq)
977 ib_destroy_cq(p->cq);
978
979 if (test_bit(IPOIB_FLAG_NETIF_STOPPED, &p->flags))
980 netif_wake_queue(p->dev);
981
982 if (p->tx_ring) {
983 while ((int) p->tx_tail - (int) p->tx_head < 0) {
984 tx_req = &p->tx_ring[p->tx_tail & (ipoib_sendq_size - 1)];
985 ib_dma_unmap_single(priv->ca, tx_req->mapping, tx_req->skb->len,
986 DMA_TO_DEVICE);
987 dev_kfree_skb_any(tx_req->skb);
988 ++p->tx_tail;
989 }
990
991 kfree(p->tx_ring);
992 }
993
994 kfree(p);
995 }
996
997 static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id,
998 struct ib_cm_event *event)
999 {
1000 struct ipoib_cm_tx *tx = cm_id->context;
1001 struct ipoib_dev_priv *priv = netdev_priv(tx->dev);
1002 struct net_device *dev = priv->dev;
1003 struct ipoib_neigh *neigh;
1004 int ret;
1005
1006 switch (event->event) {
1007 case IB_CM_DREQ_RECEIVED:
1008 ipoib_dbg(priv, "DREQ received.\n");
1009 ib_send_cm_drep(cm_id, NULL, 0);
1010 break;
1011 case IB_CM_REP_RECEIVED:
1012 ipoib_dbg(priv, "REP received.\n");
1013 ret = ipoib_cm_rep_handler(cm_id, event);
1014 if (ret)
1015 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
1016 NULL, 0, NULL, 0);
1017 break;
1018 case IB_CM_REQ_ERROR:
1019 case IB_CM_REJ_RECEIVED:
1020 case IB_CM_TIMEWAIT_EXIT:
1021 ipoib_dbg(priv, "CM error %d.\n", event->event);
1022 spin_lock_irq(&priv->tx_lock);
1023 spin_lock(&priv->lock);
1024 neigh = tx->neigh;
1025
1026 if (neigh) {
1027 neigh->cm = NULL;
1028 list_del(&neigh->list);
1029 if (neigh->ah)
1030 ipoib_put_ah(neigh->ah);
1031 ipoib_neigh_free(dev, neigh);
1032
1033 tx->neigh = NULL;
1034 }
1035
1036 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
1037 list_move(&tx->list, &priv->cm.reap_list);
1038 queue_work(ipoib_workqueue, &priv->cm.reap_task);
1039 }
1040
1041 spin_unlock(&priv->lock);
1042 spin_unlock_irq(&priv->tx_lock);
1043 break;
1044 default:
1045 break;
1046 }
1047
1048 return 0;
1049 }
1050
1051 struct ipoib_cm_tx *ipoib_cm_create_tx(struct net_device *dev, struct ipoib_path *path,
1052 struct ipoib_neigh *neigh)
1053 {
1054 struct ipoib_dev_priv *priv = netdev_priv(dev);
1055 struct ipoib_cm_tx *tx;
1056
1057 tx = kzalloc(sizeof *tx, GFP_ATOMIC);
1058 if (!tx)
1059 return NULL;
1060
1061 neigh->cm = tx;
1062 tx->neigh = neigh;
1063 tx->path = path;
1064 tx->dev = dev;
1065 list_add(&tx->list, &priv->cm.start_list);
1066 set_bit(IPOIB_FLAG_INITIALIZED, &tx->flags);
1067 queue_work(ipoib_workqueue, &priv->cm.start_task);
1068 return tx;
1069 }
1070
1071 void ipoib_cm_destroy_tx(struct ipoib_cm_tx *tx)
1072 {
1073 struct ipoib_dev_priv *priv = netdev_priv(tx->dev);
1074 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
1075 list_move(&tx->list, &priv->cm.reap_list);
1076 queue_work(ipoib_workqueue, &priv->cm.reap_task);
1077 ipoib_dbg(priv, "Reap connection for gid " IPOIB_GID_FMT "\n",
1078 IPOIB_GID_ARG(tx->neigh->dgid));
1079 tx->neigh = NULL;
1080 }
1081 }
1082
1083 static void ipoib_cm_tx_start(struct work_struct *work)
1084 {
1085 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1086 cm.start_task);
1087 struct net_device *dev = priv->dev;
1088 struct ipoib_neigh *neigh;
1089 struct ipoib_cm_tx *p;
1090 unsigned long flags;
1091 int ret;
1092
1093 struct ib_sa_path_rec pathrec;
1094 u32 qpn;
1095
1096 spin_lock_irqsave(&priv->tx_lock, flags);
1097 spin_lock(&priv->lock);
1098 while (!list_empty(&priv->cm.start_list)) {
1099 p = list_entry(priv->cm.start_list.next, typeof(*p), list);
1100 list_del_init(&p->list);
1101 neigh = p->neigh;
1102 qpn = IPOIB_QPN(neigh->neighbour->ha);
1103 memcpy(&pathrec, &p->path->pathrec, sizeof pathrec);
1104 spin_unlock(&priv->lock);
1105 spin_unlock_irqrestore(&priv->tx_lock, flags);
1106 ret = ipoib_cm_tx_init(p, qpn, &pathrec);
1107 spin_lock_irqsave(&priv->tx_lock, flags);
1108 spin_lock(&priv->lock);
1109 if (ret) {
1110 neigh = p->neigh;
1111 if (neigh) {
1112 neigh->cm = NULL;
1113 list_del(&neigh->list);
1114 if (neigh->ah)
1115 ipoib_put_ah(neigh->ah);
1116 ipoib_neigh_free(dev, neigh);
1117 }
1118 list_del(&p->list);
1119 kfree(p);
1120 }
1121 }
1122 spin_unlock(&priv->lock);
1123 spin_unlock_irqrestore(&priv->tx_lock, flags);
1124 }
1125
1126 static void ipoib_cm_tx_reap(struct work_struct *work)
1127 {
1128 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1129 cm.reap_task);
1130 struct ipoib_cm_tx *p;
1131
1132 spin_lock_irq(&priv->tx_lock);
1133 spin_lock(&priv->lock);
1134 while (!list_empty(&priv->cm.reap_list)) {
1135 p = list_entry(priv->cm.reap_list.next, typeof(*p), list);
1136 list_del(&p->list);
1137 spin_unlock(&priv->lock);
1138 spin_unlock_irq(&priv->tx_lock);
1139 ipoib_cm_tx_destroy(p);
1140 spin_lock_irq(&priv->tx_lock);
1141 spin_lock(&priv->lock);
1142 }
1143 spin_unlock(&priv->lock);
1144 spin_unlock_irq(&priv->tx_lock);
1145 }
1146
1147 static void ipoib_cm_skb_reap(struct work_struct *work)
1148 {
1149 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1150 cm.skb_task);
1151 struct net_device *dev = priv->dev;
1152 struct sk_buff *skb;
1153
1154 unsigned mtu = priv->mcast_mtu;
1155
1156 spin_lock_irq(&priv->tx_lock);
1157 spin_lock(&priv->lock);
1158 while ((skb = skb_dequeue(&priv->cm.skb_queue))) {
1159 spin_unlock(&priv->lock);
1160 spin_unlock_irq(&priv->tx_lock);
1161 if (skb->protocol == htons(ETH_P_IP))
1162 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu));
1163 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1164 else if (skb->protocol == htons(ETH_P_IPV6))
1165 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, dev);
1166 #endif
1167 dev_kfree_skb_any(skb);
1168 spin_lock_irq(&priv->tx_lock);
1169 spin_lock(&priv->lock);
1170 }
1171 spin_unlock(&priv->lock);
1172 spin_unlock_irq(&priv->tx_lock);
1173 }
1174
1175 void ipoib_cm_skb_too_long(struct net_device* dev, struct sk_buff *skb,
1176 unsigned int mtu)
1177 {
1178 struct ipoib_dev_priv *priv = netdev_priv(dev);
1179 int e = skb_queue_empty(&priv->cm.skb_queue);
1180
1181 if (skb->dst)
1182 skb->dst->ops->update_pmtu(skb->dst, mtu);
1183
1184 skb_queue_tail(&priv->cm.skb_queue, skb);
1185 if (e)
1186 queue_work(ipoib_workqueue, &priv->cm.skb_task);
1187 }
1188
1189 static void ipoib_cm_rx_reap(struct work_struct *work)
1190 {
1191 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1192 cm.rx_reap_task);
1193 struct ipoib_cm_rx *p, *n;
1194 LIST_HEAD(list);
1195
1196 spin_lock_irq(&priv->lock);
1197 list_splice_init(&priv->cm.rx_reap_list, &list);
1198 spin_unlock_irq(&priv->lock);
1199
1200 list_for_each_entry_safe(p, n, &list, list) {
1201 ib_destroy_cm_id(p->id);
1202 ib_destroy_qp(p->qp);
1203 kfree(p);
1204 }
1205 }
1206
1207 static void ipoib_cm_stale_task(struct work_struct *work)
1208 {
1209 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1210 cm.stale_task.work);
1211 struct ipoib_cm_rx *p;
1212 int ret;
1213
1214 spin_lock_irq(&priv->lock);
1215 while (!list_empty(&priv->cm.passive_ids)) {
1216 /* List is sorted by LRU, start from tail,
1217 * stop when we see a recently used entry */
1218 p = list_entry(priv->cm.passive_ids.prev, typeof(*p), list);
1219 if (time_before_eq(jiffies, p->jiffies + IPOIB_CM_RX_TIMEOUT))
1220 break;
1221 list_move(&p->list, &priv->cm.rx_error_list);
1222 p->state = IPOIB_CM_RX_ERROR;
1223 spin_unlock_irq(&priv->lock);
1224 ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE);
1225 if (ret)
1226 ipoib_warn(priv, "unable to move qp to error state: %d\n", ret);
1227 spin_lock_irq(&priv->lock);
1228 }
1229
1230 if (!list_empty(&priv->cm.passive_ids))
1231 queue_delayed_work(ipoib_workqueue,
1232 &priv->cm.stale_task, IPOIB_CM_RX_DELAY);
1233 spin_unlock_irq(&priv->lock);
1234 }
1235
1236
1237 static ssize_t show_mode(struct device *d, struct device_attribute *attr,
1238 char *buf)
1239 {
1240 struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(d));
1241
1242 if (test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags))
1243 return sprintf(buf, "connected\n");
1244 else
1245 return sprintf(buf, "datagram\n");
1246 }
1247
1248 static ssize_t set_mode(struct device *d, struct device_attribute *attr,
1249 const char *buf, size_t count)
1250 {
1251 struct net_device *dev = to_net_dev(d);
1252 struct ipoib_dev_priv *priv = netdev_priv(dev);
1253
1254 /* flush paths if we switch modes so that connections are restarted */
1255 if (IPOIB_CM_SUPPORTED(dev->dev_addr) && !strcmp(buf, "connected\n")) {
1256 set_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags);
1257 ipoib_warn(priv, "enabling connected mode "
1258 "will cause multicast packet drops\n");
1259 ipoib_flush_paths(dev);
1260 return count;
1261 }
1262
1263 if (!strcmp(buf, "datagram\n")) {
1264 clear_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags);
1265 dev->mtu = min(priv->mcast_mtu, dev->mtu);
1266 ipoib_flush_paths(dev);
1267 return count;
1268 }
1269
1270 return -EINVAL;
1271 }
1272
1273 static DEVICE_ATTR(mode, S_IWUSR | S_IRUGO, show_mode, set_mode);
1274
1275 int ipoib_cm_add_mode_attr(struct net_device *dev)
1276 {
1277 return device_create_file(&dev->dev, &dev_attr_mode);
1278 }
1279
1280 int ipoib_cm_dev_init(struct net_device *dev)
1281 {
1282 struct ipoib_dev_priv *priv = netdev_priv(dev);
1283 struct ib_srq_init_attr srq_init_attr = {
1284 .attr = {
1285 .max_wr = ipoib_recvq_size,
1286 .max_sge = IPOIB_CM_RX_SG
1287 }
1288 };
1289 int ret, i;
1290
1291 INIT_LIST_HEAD(&priv->cm.passive_ids);
1292 INIT_LIST_HEAD(&priv->cm.reap_list);
1293 INIT_LIST_HEAD(&priv->cm.start_list);
1294 INIT_LIST_HEAD(&priv->cm.rx_error_list);
1295 INIT_LIST_HEAD(&priv->cm.rx_flush_list);
1296 INIT_LIST_HEAD(&priv->cm.rx_drain_list);
1297 INIT_LIST_HEAD(&priv->cm.rx_reap_list);
1298 INIT_WORK(&priv->cm.start_task, ipoib_cm_tx_start);
1299 INIT_WORK(&priv->cm.reap_task, ipoib_cm_tx_reap);
1300 INIT_WORK(&priv->cm.skb_task, ipoib_cm_skb_reap);
1301 INIT_WORK(&priv->cm.rx_reap_task, ipoib_cm_rx_reap);
1302 INIT_DELAYED_WORK(&priv->cm.stale_task, ipoib_cm_stale_task);
1303
1304 skb_queue_head_init(&priv->cm.skb_queue);
1305
1306 priv->cm.srq = ib_create_srq(priv->pd, &srq_init_attr);
1307 if (IS_ERR(priv->cm.srq)) {
1308 ret = PTR_ERR(priv->cm.srq);
1309 priv->cm.srq = NULL;
1310 return ret;
1311 }
1312
1313 priv->cm.srq_ring = kzalloc(ipoib_recvq_size * sizeof *priv->cm.srq_ring,
1314 GFP_KERNEL);
1315 if (!priv->cm.srq_ring) {
1316 printk(KERN_WARNING "%s: failed to allocate CM ring (%d entries)\n",
1317 priv->ca->name, ipoib_recvq_size);
1318 ipoib_cm_dev_cleanup(dev);
1319 return -ENOMEM;
1320 }
1321
1322 for (i = 0; i < IPOIB_CM_RX_SG; ++i)
1323 priv->cm.rx_sge[i].lkey = priv->mr->lkey;
1324
1325 priv->cm.rx_sge[0].length = IPOIB_CM_HEAD_SIZE;
1326 for (i = 1; i < IPOIB_CM_RX_SG; ++i)
1327 priv->cm.rx_sge[i].length = PAGE_SIZE;
1328 priv->cm.rx_wr.next = NULL;
1329 priv->cm.rx_wr.sg_list = priv->cm.rx_sge;
1330 priv->cm.rx_wr.num_sge = IPOIB_CM_RX_SG;
1331
1332 for (i = 0; i < ipoib_recvq_size; ++i) {
1333 if (!ipoib_cm_alloc_rx_skb(dev, i, IPOIB_CM_RX_SG - 1,
1334 priv->cm.srq_ring[i].mapping)) {
1335 ipoib_warn(priv, "failed to allocate receive buffer %d\n", i);
1336 ipoib_cm_dev_cleanup(dev);
1337 return -ENOMEM;
1338 }
1339 if (ipoib_cm_post_receive(dev, i)) {
1340 ipoib_warn(priv, "ipoib_ib_post_receive failed for buf %d\n", i);
1341 ipoib_cm_dev_cleanup(dev);
1342 return -EIO;
1343 }
1344 }
1345
1346 priv->dev->dev_addr[0] = IPOIB_FLAGS_RC;
1347 return 0;
1348 }
1349
1350 void ipoib_cm_dev_cleanup(struct net_device *dev)
1351 {
1352 struct ipoib_dev_priv *priv = netdev_priv(dev);
1353 int i, ret;
1354
1355 if (!priv->cm.srq)
1356 return;
1357
1358 ipoib_dbg(priv, "Cleanup ipoib connected mode.\n");
1359
1360 ret = ib_destroy_srq(priv->cm.srq);
1361 if (ret)
1362 ipoib_warn(priv, "ib_destroy_srq failed: %d\n", ret);
1363
1364 priv->cm.srq = NULL;
1365 if (!priv->cm.srq_ring)
1366 return;
1367 for (i = 0; i < ipoib_recvq_size; ++i)
1368 if (priv->cm.srq_ring[i].skb) {
1369 ipoib_cm_dma_unmap_rx(priv, IPOIB_CM_RX_SG - 1,
1370 priv->cm.srq_ring[i].mapping);
1371 dev_kfree_skb_any(priv->cm.srq_ring[i].skb);
1372 priv->cm.srq_ring[i].skb = NULL;
1373 }
1374 kfree(priv->cm.srq_ring);
1375 priv->cm.srq_ring = NULL;
1376 }
Tomato firmware and modifications.