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IPoIB/cm: Use common CQ for CM send completions
[deliverable/linux.git] / drivers / infiniband / ulp / ipoib / ipoib_cm.c
CommitLineData
839fcaba
MT		 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>
518b1646 40#include <linux/delay.h>
839fcaba
MT		 41
42#ifdef CONFIG_INFINIBAND_IPOIB_DEBUG_DATA
43static int data_debug_level;
44
45module_param_named(cm_data_debug_level, data_debug_level, int, 0644);
46MODULE_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
518b1646
MT		 59static 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
ec56dc0b
MT		 65static struct ib_send_wr ipoib_cm_rx_drain_wr = {
66 .wr_id = IPOIB_CM_RX_DRAIN_WRID,
67 .opcode = IB_WR_SEND,
518b1646
MT		 68};
69
839fcaba
MT		 70static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id,
71 struct ib_cm_event *event);
72
1812063b 73static void ipoib_cm_dma_unmap_rx(struct ipoib_dev_priv *priv, int frags,
839fcaba
MT		 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
1812063b 80 for (i = 0; i < frags; ++i)
839fcaba
MT		 81 ib_dma_unmap_single(priv->ca, mapping[i + 1], PAGE_SIZE, DMA_FROM_DEVICE);
82}
83
84static 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
1b524963 90 priv->cm.rx_wr.wr_id = id | IPOIB_OP_CM | IPOIB_OP_RECV;
839fcaba
MT		 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);
1812063b
MT		 98 ipoib_cm_dma_unmap_rx(priv, IPOIB_CM_RX_SG - 1,
99 priv->cm.srq_ring[id].mapping);
839fcaba
MT		 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
1812063b
MT		 107static struct sk_buff *ipoib_cm_alloc_rx_skb(struct net_device *dev, int id, int frags,
108 u64 mapping[IPOIB_CM_RX_SG])
839fcaba
MT		 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))
1812063b 116 return NULL;
839fcaba
MT		 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);
1812063b 128 return NULL;
839fcaba
MT		 129 }
130
1812063b 131 for (i = 0; i < frags; i++) {
839fcaba
MT		 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,
6371ea3d 139 0, PAGE_SIZE, DMA_FROM_DEVICE);
839fcaba
MT		 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;
1812063b 145 return skb;
839fcaba
MT		 146
147partial_error:
148
149 ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_CM_HEAD_SIZE, DMA_FROM_DEVICE);
150
841adfca
RC		 151 for (; i > 0; --i)
152 ib_dma_unmap_single(priv->ca, mapping[i], PAGE_SIZE, DMA_FROM_DEVICE);
839fcaba 153
8a2e65f8 154 dev_kfree_skb_any(skb);
1812063b 155 return NULL;
839fcaba
MT		 156}
157
518b1646
MT		 158static void ipoib_cm_start_rx_drain(struct ipoib_dev_priv* priv)
159{
ec56dc0b
MT		 160 struct ib_send_wr *bad_wr;
161 struct ipoib_cm_rx *p;
518b1646 162
ec56dc0b 163 /* We only reserved 1 extra slot in CQ for drain WRs, so
518b1646
MT		 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
ec56dc0b
MT		 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");
518b1646
MT		 176
177 list_splice_init(&priv->cm.rx_flush_list, &priv->cm.rx_drain_list);
178}
179
180static 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
839fcaba
MT		 196static 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 = {
518b1646 201 .event_handler = ipoib_cm_rx_event_handler,
ec56dc0b 202 .send_cq = priv->cq, /* For drain WR */
839fcaba
MT		 203 .recv_cq = priv->cq,
204 .srq = priv->cm.srq,
ec56dc0b 205 .cap.max_send_wr = 1, /* For drain WR */
839fcaba
MT		 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
214static 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 }
ec56dc0b
MT		 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
839fcaba
MT		 266 return 0;
267}
268
269static 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;
839fcaba
MT		 284 rep.srq = 1;
285 rep.qp_num = qp->qp_num;
286 rep.starting_psn = psn;
287 return ib_send_cm_rep(cm_id, &rep);
288}
289
290static int ipoib_cm_req_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
291{
292 struct net_device *dev = cm_id->context;
293 struct ipoib_dev_priv *priv = netdev_priv(dev);
294 struct ipoib_cm_rx *p;
839fcaba
MT		 295 unsigned psn;
296 int ret;
297
298 ipoib_dbg(priv, "REQ arrived\n");
299 p = kzalloc(sizeof *p, GFP_KERNEL);
300 if (!p)
301 return -ENOMEM;
302 p->dev = dev;
303 p->id = cm_id;
3ec7393a
MT		 304 cm_id->context = p;
305 p->state = IPOIB_CM_RX_LIVE;
306 p->jiffies = jiffies;
307 INIT_LIST_HEAD(&p->list);
308
839fcaba
MT		 309 p->qp = ipoib_cm_create_rx_qp(dev, p);
310 if (IS_ERR(p->qp)) {
311 ret = PTR_ERR(p->qp);
312 goto err_qp;
313 }
314
315 psn = random32() & 0xffffff;
316 ret = ipoib_cm_modify_rx_qp(dev, cm_id, p->qp, psn);
317 if (ret)
318 goto err_modify;
319
3ec7393a
MT		 320 spin_lock_irq(&priv->lock);
321 queue_delayed_work(ipoib_workqueue,
322 &priv->cm.stale_task, IPOIB_CM_RX_DELAY);
323 /* Add this entry to passive ids list head, but do not re-add it
324 * if IB_EVENT_QP_LAST_WQE_REACHED has moved it to flush list. */
325 p->jiffies = jiffies;
326 if (p->state == IPOIB_CM_RX_LIVE)
327 list_move(&p->list, &priv->cm.passive_ids);
328 spin_unlock_irq(&priv->lock);
329
839fcaba
MT		 330 ret = ipoib_cm_send_rep(dev, cm_id, p->qp, &event->param.req_rcvd, psn);
331 if (ret) {
332 ipoib_warn(priv, "failed to send REP: %d\n", ret);
3ec7393a
MT		 333 if (ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE))
334 ipoib_warn(priv, "unable to move qp to error state\n");
839fcaba 335 }
839fcaba
MT		 336 return 0;
337
839fcaba
MT		 338err_modify:
339 ib_destroy_qp(p->qp);
340err_qp:
341 kfree(p);
342 return ret;
343}
344
345static int ipoib_cm_rx_handler(struct ib_cm_id *cm_id,
346 struct ib_cm_event *event)
347{
348 struct ipoib_cm_rx *p;
349 struct ipoib_dev_priv *priv;
839fcaba
MT		 350
351 switch (event->event) {
352 case IB_CM_REQ_RECEIVED:
353 return ipoib_cm_req_handler(cm_id, event);
354 case IB_CM_DREQ_RECEIVED:
355 p = cm_id->context;
356 ib_send_cm_drep(cm_id, NULL, 0);
357 /* Fall through */
358 case IB_CM_REJ_RECEIVED:
359 p = cm_id->context;
360 priv = netdev_priv(p->dev);
518b1646
MT		 361 if (ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE))
362 ipoib_warn(priv, "unable to move qp to error state\n");
363 /* Fall through */
839fcaba
MT		 364 default:
365 return 0;
366 }
367}
368/* Adjust length of skb with fragments to match received data */
369static void skb_put_frags(struct sk_buff *skb, unsigned int hdr_space,
1812063b 370 unsigned int length, struct sk_buff *toskb)
839fcaba
MT		 371{
372 int i, num_frags;
373 unsigned int size;
374
375 /* put header into skb */
376 size = min(length, hdr_space);
377 skb->tail += size;
378 skb->len += size;
379 length -= size;
380
381 num_frags = skb_shinfo(skb)->nr_frags;
382 for (i = 0; i < num_frags; i++) {
383 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
384
385 if (length == 0) {
386 /* don't need this page */
1812063b 387 skb_fill_page_desc(toskb, i, frag->page, 0, PAGE_SIZE);
839fcaba
MT		 388 --skb_shinfo(skb)->nr_frags;
389 } else {
390 size = min(length, (unsigned) PAGE_SIZE);
391
392 frag->size = size;
393 skb->data_len += size;
394 skb->truesize += size;
395 skb->len += size;
396 length -= size;
397 }
398 }
399}
400
401void ipoib_cm_handle_rx_wc(struct net_device *dev, struct ib_wc *wc)
402{
403 struct ipoib_dev_priv *priv = netdev_priv(dev);
1b524963 404 unsigned int wr_id = wc->wr_id & ~(IPOIB_OP_CM | IPOIB_OP_RECV);
1812063b 405 struct sk_buff *skb, *newskb;
839fcaba
MT		 406 struct ipoib_cm_rx *p;
407 unsigned long flags;
408 u64 mapping[IPOIB_CM_RX_SG];
1812063b 409 int frags;
839fcaba 410
a89875fc
RD		 411 ipoib_dbg_data(priv, "cm recv completion: id %d, status: %d\n",
412 wr_id, wc->status);
839fcaba
MT		 413
414 if (unlikely(wr_id >= ipoib_recvq_size)) {
1b524963 415 if (wr_id == (IPOIB_CM_RX_DRAIN_WRID & ~(IPOIB_OP_CM | IPOIB_OP_RECV))) {
518b1646
MT		 416 spin_lock_irqsave(&priv->lock, flags);
417 list_splice_init(&priv->cm.rx_drain_list, &priv->cm.rx_reap_list);
418 ipoib_cm_start_rx_drain(priv);
419 queue_work(ipoib_workqueue, &priv->cm.rx_reap_task);
420 spin_unlock_irqrestore(&priv->lock, flags);
421 } else
422 ipoib_warn(priv, "cm recv completion event with wrid %d (> %d)\n",
423 wr_id, ipoib_recvq_size);
839fcaba
MT		 424 return;
425 }
426
427 skb = priv->cm.srq_ring[wr_id].skb;
428
429 if (unlikely(wc->status != IB_WC_SUCCESS)) {
430 ipoib_dbg(priv, "cm recv error "
431 "(status=%d, wrid=%d vend_err %x)\n",
432 wc->status, wr_id, wc->vendor_err);
de903512 433 ++dev->stats.rx_dropped;
839fcaba
MT		 434 goto repost;
435 }
436
fd312561 437 if (unlikely(!(wr_id & IPOIB_CM_RX_UPDATE_MASK))) {
839fcaba 438 p = wc->qp->qp_context;
d6ef7d68 439 if (p && time_after_eq(jiffies, p->jiffies + IPOIB_CM_RX_UPDATE_TIME)) {
839fcaba
MT		 440 spin_lock_irqsave(&priv->lock, flags);
441 p->jiffies = jiffies;
518b1646
MT		 442 /* Move this entry to list head, but do not re-add it
443 * if it has been moved out of list. */
444 if (p->state == IPOIB_CM_RX_LIVE)
839fcaba
MT		 445 list_move(&p->list, &priv->cm.passive_ids);
446 spin_unlock_irqrestore(&priv->lock, flags);
839fcaba
MT		 447 }
448 }
449
1812063b
MT		 450 frags = PAGE_ALIGN(wc->byte_len - min(wc->byte_len,
451 (unsigned)IPOIB_CM_HEAD_SIZE)) / PAGE_SIZE;
452
453 newskb = ipoib_cm_alloc_rx_skb(dev, wr_id, frags, mapping);
454 if (unlikely(!newskb)) {
839fcaba
MT		 455 /*
456 * If we can't allocate a new RX buffer, dump
457 * this packet and reuse the old buffer.
458 */
459 ipoib_dbg(priv, "failed to allocate receive buffer %d\n", wr_id);
de903512 460 ++dev->stats.rx_dropped;
839fcaba
MT		 461 goto repost;
462 }
463
1812063b
MT		 464 ipoib_cm_dma_unmap_rx(priv, frags, priv->cm.srq_ring[wr_id].mapping);
465 memcpy(priv->cm.srq_ring[wr_id].mapping, mapping, (frags + 1) * sizeof *mapping);
839fcaba
MT		 466
467 ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n",
468 wc->byte_len, wc->slid);
469
1812063b 470 skb_put_frags(skb, IPOIB_CM_HEAD_SIZE, wc->byte_len, newskb);
839fcaba
MT		 471
472 skb->protocol = ((struct ipoib_header *) skb->data)->proto;
459a98ed 473 skb_reset_mac_header(skb);
839fcaba
MT		 474 skb_pull(skb, IPOIB_ENCAP_LEN);
475
476 dev->last_rx = jiffies;
de903512
RD		 477 ++dev->stats.rx_packets;
478 dev->stats.rx_bytes += skb->len;
839fcaba
MT		 479
480 skb->dev = dev;
481 /* XXX get correct PACKET_ type here */
482 skb->pkt_type = PACKET_HOST;
8d1cc86a 483 netif_receive_skb(skb);
839fcaba
MT		 484
485repost:
486 if (unlikely(ipoib_cm_post_receive(dev, wr_id)))
487 ipoib_warn(priv, "ipoib_cm_post_receive failed "
488 "for buf %d\n", wr_id);
489}
490
491static inline int post_send(struct ipoib_dev_priv *priv,
492 struct ipoib_cm_tx *tx,
493 unsigned int wr_id,
494 u64 addr, int len)
495{
496 struct ib_send_wr *bad_wr;
497
498 priv->tx_sge.addr = addr;
499 priv->tx_sge.length = len;
500
1b524963 501 priv->tx_wr.wr_id = wr_id | IPOIB_OP_CM;
839fcaba
MT		 502
503 return ib_post_send(tx->qp, &priv->tx_wr, &bad_wr);
504}
505
506void ipoib_cm_send(struct net_device *dev, struct sk_buff *skb, struct ipoib_cm_tx *tx)
507{
508 struct ipoib_dev_priv *priv = netdev_priv(dev);
509 struct ipoib_tx_buf *tx_req;
510 u64 addr;
511
512 if (unlikely(skb->len > tx->mtu)) {
513 ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n",
514 skb->len, tx->mtu);
de903512
RD		 515 ++dev->stats.tx_dropped;
516 ++dev->stats.tx_errors;
77d8e1ef 517 ipoib_cm_skb_too_long(dev, skb, tx->mtu - IPOIB_ENCAP_LEN);
839fcaba
MT		 518 return;
519 }
520
521 ipoib_dbg_data(priv, "sending packet: head 0x%x length %d connection 0x%x\n",
522 tx->tx_head, skb->len, tx->qp->qp_num);
523
524 /*
525 * We put the skb into the tx_ring _before_ we call post_send()
526 * because it's entirely possible that the completion handler will
527 * run before we execute anything after the post_send(). That
528 * means we have to make sure everything is properly recorded and
529 * our state is consistent before we call post_send().
530 */
531 tx_req = &tx->tx_ring[tx->tx_head & (ipoib_sendq_size - 1)];
532 tx_req->skb = skb;
533 addr = ib_dma_map_single(priv->ca, skb->data, skb->len, DMA_TO_DEVICE);
534 if (unlikely(ib_dma_mapping_error(priv->ca, addr))) {
de903512 535 ++dev->stats.tx_errors;
839fcaba
MT		 536 dev_kfree_skb_any(skb);
537 return;
538 }
539
540 tx_req->mapping = addr;
541
542 if (unlikely(post_send(priv, tx, tx->tx_head & (ipoib_sendq_size - 1),
543 addr, skb->len))) {
544 ipoib_warn(priv, "post_send failed\n");
de903512 545 ++dev->stats.tx_errors;
839fcaba
MT		 546 ib_dma_unmap_single(priv->ca, addr, skb->len, DMA_TO_DEVICE);
547 dev_kfree_skb_any(skb);
548 } else {
549 dev->trans_start = jiffies;
550 ++tx->tx_head;
551
1b524963 552 if (++priv->tx_outstanding == ipoib_sendq_size) {
839fcaba
MT		 553 ipoib_dbg(priv, "TX ring 0x%x full, stopping kernel net queue\n",
554 tx->qp->qp_num);
555 netif_stop_queue(dev);
839fcaba
MT		 556 }
557 }
558}
559
1b524963 560void ipoib_cm_handle_tx_wc(struct net_device *dev, struct ib_wc *wc)
839fcaba
MT		 561{
562 struct ipoib_dev_priv *priv = netdev_priv(dev);
1b524963
MT		 563 struct ipoib_cm_tx *tx = wc->qp->qp_context;
564 unsigned int wr_id = wc->wr_id & ~IPOIB_OP_CM;
839fcaba
MT		 565 struct ipoib_tx_buf *tx_req;
566 unsigned long flags;
567
a89875fc
RD		 568 ipoib_dbg_data(priv, "cm send completion: id %d, status: %d\n",
569 wr_id, wc->status);
839fcaba
MT		 570
571 if (unlikely(wr_id >= ipoib_sendq_size)) {
572 ipoib_warn(priv, "cm send completion event with wrid %d (> %d)\n",
573 wr_id, ipoib_sendq_size);
574 return;
575 }
576
577 tx_req = &tx->tx_ring[wr_id];
578
579 ib_dma_unmap_single(priv->ca, tx_req->mapping, tx_req->skb->len, DMA_TO_DEVICE);
580
581 /* FIXME: is this right? Shouldn't we only increment on success? */
de903512
RD		 582 ++dev->stats.tx_packets;
583 dev->stats.tx_bytes += tx_req->skb->len;
839fcaba
MT		 584
585 dev_kfree_skb_any(tx_req->skb);
586
587 spin_lock_irqsave(&priv->tx_lock, flags);
588 ++tx->tx_tail;
1b524963
MT		 589 if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) &&
590 netif_queue_stopped(dev) &&
591 test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
839fcaba 592 netif_wake_queue(dev);
839fcaba
MT		 593
594 if (wc->status != IB_WC_SUCCESS &&
595 wc->status != IB_WC_WR_FLUSH_ERR) {
596 struct ipoib_neigh *neigh;
597
598 ipoib_dbg(priv, "failed cm send event "
599 "(status=%d, wrid=%d vend_err %x)\n",
600 wc->status, wr_id, wc->vendor_err);
601
602 spin_lock(&priv->lock);
603 neigh = tx->neigh;
604
605 if (neigh) {
606 neigh->cm = NULL;
607 list_del(&neigh->list);
608 if (neigh->ah)
609 ipoib_put_ah(neigh->ah);
610 ipoib_neigh_free(dev, neigh);
611
612 tx->neigh = NULL;
613 }
614
839fcaba
MT		 615 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
616 list_move(&tx->list, &priv->cm.reap_list);
617 queue_work(ipoib_workqueue, &priv->cm.reap_task);
618 }
619
620 clear_bit(IPOIB_FLAG_OPER_UP, &tx->flags);
621
622 spin_unlock(&priv->lock);
623 }
624
625 spin_unlock_irqrestore(&priv->tx_lock, flags);
626}
627
839fcaba
MT		 628int ipoib_cm_dev_open(struct net_device *dev)
629{
630 struct ipoib_dev_priv *priv = netdev_priv(dev);
631 int ret;
632
633 if (!IPOIB_CM_SUPPORTED(dev->dev_addr))
634 return 0;
635
636 priv->cm.id = ib_create_cm_id(priv->ca, ipoib_cm_rx_handler, dev);
637 if (IS_ERR(priv->cm.id)) {
638 printk(KERN_WARNING "%s: failed to create CM ID\n", priv->ca->name);
347fcfbe 639 ret = PTR_ERR(priv->cm.id);
518b1646 640 goto err_cm;
839fcaba
MT		 641 }
642
643 ret = ib_cm_listen(priv->cm.id, cpu_to_be64(IPOIB_CM_IETF_ID | priv->qp->qp_num),
644 0, NULL);
645 if (ret) {
646 printk(KERN_WARNING "%s: failed to listen on ID 0x%llx\n", priv->ca->name,
647 IPOIB_CM_IETF_ID | priv->qp->qp_num);
518b1646 648 goto err_listen;
839fcaba 649 }
518b1646 650
839fcaba 651 return 0;
518b1646
MT		 652
653err_listen:
654 ib_destroy_cm_id(priv->cm.id);
655err_cm:
656 priv->cm.id = NULL;
518b1646 657 return ret;
839fcaba
MT		 658}
659
660void ipoib_cm_dev_stop(struct net_device *dev)
661{
662 struct ipoib_dev_priv *priv = netdev_priv(dev);
518b1646
MT		 663 struct ipoib_cm_rx *p, *n;
664 unsigned long begin;
665 LIST_HEAD(list);
666 int ret;
839fcaba 667
347fcfbe 668 if (!IPOIB_CM_SUPPORTED(dev->dev_addr) || !priv->cm.id)
839fcaba
MT		 669 return;
670
671 ib_destroy_cm_id(priv->cm.id);
347fcfbe 672 priv->cm.id = NULL;
518b1646 673
37aebbde 674 spin_lock_irq(&priv->lock);
839fcaba
MT		 675 while (!list_empty(&priv->cm.passive_ids)) {
676 p = list_entry(priv->cm.passive_ids.next, typeof(*p), list);
518b1646
MT		 677 list_move(&p->list, &priv->cm.rx_error_list);
678 p->state = IPOIB_CM_RX_ERROR;
37aebbde 679 spin_unlock_irq(&priv->lock);
518b1646
MT		 680 ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE);
681 if (ret)
682 ipoib_warn(priv, "unable to move qp to error state: %d\n", ret);
683 spin_lock_irq(&priv->lock);
684 }
685
686 /* Wait for all RX to be drained */
687 begin = jiffies;
688
689 while (!list_empty(&priv->cm.rx_error_list) ||
690 !list_empty(&priv->cm.rx_flush_list) ||
691 !list_empty(&priv->cm.rx_drain_list)) {
8fd357a6 692 if (time_after(jiffies, begin + 5 * HZ)) {
518b1646
MT		 693 ipoib_warn(priv, "RX drain timing out\n");
694
695 /*
696 * assume the HW is wedged and just free up everything.
697 */
698 list_splice_init(&priv->cm.rx_flush_list, &list);
699 list_splice_init(&priv->cm.rx_error_list, &list);
700 list_splice_init(&priv->cm.rx_drain_list, &list);
701 break;
702 }
703 spin_unlock_irq(&priv->lock);
704 msleep(1);
2dfbfc37 705 ipoib_drain_cq(dev);
518b1646
MT		 706 spin_lock_irq(&priv->lock);
707 }
708
709 list_splice_init(&priv->cm.rx_reap_list, &list);
710
711 spin_unlock_irq(&priv->lock);
712
713 list_for_each_entry_safe(p, n, &list, list) {
839fcaba
MT		 714 ib_destroy_cm_id(p->id);
715 ib_destroy_qp(p->qp);
716 kfree(p);
839fcaba 717 }
839fcaba
MT		 718
719 cancel_delayed_work(&priv->cm.stale_task);
720}
721
722static int ipoib_cm_rep_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
723{
724 struct ipoib_cm_tx *p = cm_id->context;
725 struct ipoib_dev_priv *priv = netdev_priv(p->dev);
726 struct ipoib_cm_data *data = event->private_data;
727 struct sk_buff_head skqueue;
728 struct ib_qp_attr qp_attr;
729 int qp_attr_mask, ret;
730 struct sk_buff *skb;
839fcaba
MT		 731
732 p->mtu = be32_to_cpu(data->mtu);
733
82c3aca6
MT		 734 if (p->mtu <= IPOIB_ENCAP_LEN) {
735 ipoib_warn(priv, "Rejecting connection: mtu %d <= %d\n",
736 p->mtu, IPOIB_ENCAP_LEN);
839fcaba
MT		 737 return -EINVAL;
738 }
739
740 qp_attr.qp_state = IB_QPS_RTR;
741 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
742 if (ret) {
743 ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret);
744 return ret;
745 }
746
747 qp_attr.rq_psn = 0 /* FIXME */;
748 ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask);
749 if (ret) {
750 ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret);
751 return ret;
752 }
753
754 qp_attr.qp_state = IB_QPS_RTS;
755 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
756 if (ret) {
757 ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret);
758 return ret;
759 }
760 ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask);
761 if (ret) {
762 ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret);
763 return ret;
764 }
765
766 skb_queue_head_init(&skqueue);
767
37aebbde 768 spin_lock_irq(&priv->lock);
839fcaba
MT		 769 set_bit(IPOIB_FLAG_OPER_UP, &p->flags);
770 if (p->neigh)
771 while ((skb = __skb_dequeue(&p->neigh->queue)))
772 __skb_queue_tail(&skqueue, skb);
37aebbde 773 spin_unlock_irq(&priv->lock);
839fcaba
MT		 774
775 while ((skb = __skb_dequeue(&skqueue))) {
776 skb->dev = p->dev;
777 if (dev_queue_xmit(skb))
778 ipoib_warn(priv, "dev_queue_xmit failed "
779 "to requeue packet\n");
780 }
781
782 ret = ib_send_cm_rtu(cm_id, NULL, 0);
783 if (ret) {
784 ipoib_warn(priv, "failed to send RTU: %d\n", ret);
785 return ret;
786 }
787 return 0;
788}
789
1b524963 790static struct ib_qp *ipoib_cm_create_tx_qp(struct net_device *dev, struct ipoib_cm_tx *tx)
839fcaba
MT		 791{
792 struct ipoib_dev_priv *priv = netdev_priv(dev);
ede6bc04 793 struct ib_qp_init_attr attr = {
1b524963 794 .send_cq = priv->cq,
ede6bc04
DB		 795 .recv_cq = priv->cq,
796 .srq = priv->cm.srq,
797 .cap.max_send_wr = ipoib_sendq_size,
798 .cap.max_send_sge = 1,
799 .sq_sig_type = IB_SIGNAL_ALL_WR,
800 .qp_type = IB_QPT_RC,
1b524963 801 .qp_context = tx
ede6bc04
DB		 802 };
803
839fcaba
MT		 804 return ib_create_qp(priv->pd, &attr);
805}
806
807static int ipoib_cm_send_req(struct net_device *dev,
808 struct ib_cm_id *id, struct ib_qp *qp,
809 u32 qpn,
810 struct ib_sa_path_rec *pathrec)
811{
812 struct ipoib_dev_priv *priv = netdev_priv(dev);
813 struct ipoib_cm_data data = {};
814 struct ib_cm_req_param req = {};
815
816 data.qpn = cpu_to_be32(priv->qp->qp_num);
817 data.mtu = cpu_to_be32(IPOIB_CM_BUF_SIZE);
818
819 req.primary_path = pathrec;
820 req.alternate_path = NULL;
821 req.service_id = cpu_to_be64(IPOIB_CM_IETF_ID | qpn);
822 req.qp_num = qp->qp_num;
823 req.qp_type = qp->qp_type;
824 req.private_data = &data;
825 req.private_data_len = sizeof data;
826 req.flow_control = 0;
827
828 req.starting_psn = 0; /* FIXME */
829
830 /*
831 * Pick some arbitrary defaults here; we could make these
832 * module parameters if anyone cared about setting them.
833 */
834 req.responder_resources = 4;
835 req.remote_cm_response_timeout = 20;
836 req.local_cm_response_timeout = 20;
837 req.retry_count = 0; /* RFC draft warns against retries */
838 req.rnr_retry_count = 0; /* RFC draft warns against retries */
839 req.max_cm_retries = 15;
840 req.srq = 1;
841 return ib_send_cm_req(id, &req);
842}
843
844static int ipoib_cm_modify_tx_init(struct net_device *dev,
845 struct ib_cm_id *cm_id, struct ib_qp *qp)
846{
847 struct ipoib_dev_priv *priv = netdev_priv(dev);
848 struct ib_qp_attr qp_attr;
849 int qp_attr_mask, ret;
850 ret = ib_find_cached_pkey(priv->ca, priv->port, priv->pkey, &qp_attr.pkey_index);
851 if (ret) {
852 ipoib_warn(priv, "pkey 0x%x not in cache: %d\n", priv->pkey, ret);
853 return ret;
854 }
855
856 qp_attr.qp_state = IB_QPS_INIT;
857 qp_attr.qp_access_flags = IB_ACCESS_LOCAL_WRITE;
858 qp_attr.port_num = priv->port;
859 qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS | IB_QP_PKEY_INDEX | IB_QP_PORT;
860
861 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
862 if (ret) {
863 ipoib_warn(priv, "failed to modify tx QP to INIT: %d\n", ret);
864 return ret;
865 }
866 return 0;
867}
868
869static int ipoib_cm_tx_init(struct ipoib_cm_tx *p, u32 qpn,
870 struct ib_sa_path_rec *pathrec)
871{
872 struct ipoib_dev_priv *priv = netdev_priv(p->dev);
873 int ret;
874
875 p->tx_ring = kzalloc(ipoib_sendq_size * sizeof *p->tx_ring,
876 GFP_KERNEL);
877 if (!p->tx_ring) {
878 ipoib_warn(priv, "failed to allocate tx ring\n");
879 ret = -ENOMEM;
880 goto err_tx;
881 }
882
1b524963 883 p->qp = ipoib_cm_create_tx_qp(p->dev, p);
839fcaba
MT		 884 if (IS_ERR(p->qp)) {
885 ret = PTR_ERR(p->qp);
886 ipoib_warn(priv, "failed to allocate tx qp: %d\n", ret);
887 goto err_qp;
888 }
889
890 p->id = ib_create_cm_id(priv->ca, ipoib_cm_tx_handler, p);
891 if (IS_ERR(p->id)) {
892 ret = PTR_ERR(p->id);
893 ipoib_warn(priv, "failed to create tx cm id: %d\n", ret);
894 goto err_id;
895 }
896
897 ret = ipoib_cm_modify_tx_init(p->dev, p->id, p->qp);
898 if (ret) {
899 ipoib_warn(priv, "failed to modify tx qp to rtr: %d\n", ret);
900 goto err_modify;
901 }
902
903 ret = ipoib_cm_send_req(p->dev, p->id, p->qp, qpn, pathrec);
904 if (ret) {
905 ipoib_warn(priv, "failed to send cm req: %d\n", ret);
906 goto err_send_cm;
907 }
908
909 ipoib_dbg(priv, "Request connection 0x%x for gid " IPOIB_GID_FMT " qpn 0x%x\n",
910 p->qp->qp_num, IPOIB_GID_ARG(pathrec->dgid), qpn);
911
912 return 0;
913
914err_send_cm:
915err_modify:
916 ib_destroy_cm_id(p->id);
917err_id:
918 p->id = NULL;
919 ib_destroy_qp(p->qp);
839fcaba
MT		 920err_qp:
921 p->qp = NULL;
839fcaba
MT		 922err_tx:
923 return ret;
924}
925
926static void ipoib_cm_tx_destroy(struct ipoib_cm_tx *p)
927{
928 struct ipoib_dev_priv *priv = netdev_priv(p->dev);
929 struct ipoib_tx_buf *tx_req;
1b524963
MT		 930 unsigned long flags;
931 unsigned long begin;
839fcaba
MT		 932
933 ipoib_dbg(priv, "Destroy active connection 0x%x head 0x%x tail 0x%x\n",
934 p->qp ? p->qp->qp_num : 0, p->tx_head, p->tx_tail);
935
936 if (p->id)
937 ib_destroy_cm_id(p->id);
938
839fcaba 939 if (p->tx_ring) {
1b524963
MT		 940 /* Wait for all sends to complete */
941 begin = jiffies;
839fcaba 942 while ((int) p->tx_tail - (int) p->tx_head < 0) {
1b524963
MT		 943 if (time_after(jiffies, begin + 5 * HZ)) {
944 ipoib_warn(priv, "timing out; %d sends not completed\n",
945 p->tx_head - p->tx_tail);
946 goto timeout;
947 }
948
949 msleep(1);
839fcaba 950 }
1b524963
MT		 951 }
952
953timeout:
839fcaba 954
1b524963
MT		 955 while ((int) p->tx_tail - (int) p->tx_head < 0) {
956 tx_req = &p->tx_ring[p->tx_tail & (ipoib_sendq_size - 1)];
957 ib_dma_unmap_single(priv->ca, tx_req->mapping, tx_req->skb->len,
958 DMA_TO_DEVICE);
959 dev_kfree_skb_any(tx_req->skb);
960 ++p->tx_tail;
961 spin_lock_irqsave(&priv->tx_lock, flags);
962 if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) &&
963 netif_queue_stopped(p->dev) &&
964 test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
965 netif_wake_queue(p->dev);
966 spin_unlock_irqrestore(&priv->tx_lock, flags);
839fcaba
MT		 967 }
968
1b524963
MT		 969 if (p->qp)
970 ib_destroy_qp(p->qp);
971
972 kfree(p->tx_ring);
839fcaba
MT		 973 kfree(p);
974}
975
976static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id,
977 struct ib_cm_event *event)
978{
979 struct ipoib_cm_tx *tx = cm_id->context;
980 struct ipoib_dev_priv *priv = netdev_priv(tx->dev);
981 struct net_device *dev = priv->dev;
982 struct ipoib_neigh *neigh;
839fcaba
MT		 983 int ret;
984
985 switch (event->event) {
986 case IB_CM_DREQ_RECEIVED:
987 ipoib_dbg(priv, "DREQ received.\n");
988 ib_send_cm_drep(cm_id, NULL, 0);
989 break;
990 case IB_CM_REP_RECEIVED:
991 ipoib_dbg(priv, "REP received.\n");
992 ret = ipoib_cm_rep_handler(cm_id, event);
993 if (ret)
994 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
995 NULL, 0, NULL, 0);
996 break;
997 case IB_CM_REQ_ERROR:
998 case IB_CM_REJ_RECEIVED:
999 case IB_CM_TIMEWAIT_EXIT:
1000 ipoib_dbg(priv, "CM error %d.\n", event->event);
37aebbde 1001 spin_lock_irq(&priv->tx_lock);
839fcaba
MT		 1002 spin_lock(&priv->lock);
1003 neigh = tx->neigh;
1004
1005 if (neigh) {
1006 neigh->cm = NULL;
1007 list_del(&neigh->list);
1008 if (neigh->ah)
1009 ipoib_put_ah(neigh->ah);
1010 ipoib_neigh_free(dev, neigh);
1011
1012 tx->neigh = NULL;
1013 }
1014
1015 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
1016 list_move(&tx->list, &priv->cm.reap_list);
1017 queue_work(ipoib_workqueue, &priv->cm.reap_task);
1018 }
1019
1020 spin_unlock(&priv->lock);
37aebbde 1021 spin_unlock_irq(&priv->tx_lock);
839fcaba
MT		 1022 break;
1023 default:
1024 break;
1025 }
1026
1027 return 0;
1028}
1029
1030struct ipoib_cm_tx *ipoib_cm_create_tx(struct net_device *dev, struct ipoib_path *path,
1031 struct ipoib_neigh *neigh)
1032{
1033 struct ipoib_dev_priv *priv = netdev_priv(dev);
1034 struct ipoib_cm_tx *tx;
1035
1036 tx = kzalloc(sizeof *tx, GFP_ATOMIC);
1037 if (!tx)
1038 return NULL;
1039
1040 neigh->cm = tx;
1041 tx->neigh = neigh;
1042 tx->path = path;
1043 tx->dev = dev;
1044 list_add(&tx->list, &priv->cm.start_list);
1045 set_bit(IPOIB_FLAG_INITIALIZED, &tx->flags);
1046 queue_work(ipoib_workqueue, &priv->cm.start_task);
1047 return tx;
1048}
1049
1050void ipoib_cm_destroy_tx(struct ipoib_cm_tx *tx)
1051{
1052 struct ipoib_dev_priv *priv = netdev_priv(tx->dev);
1053 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
1054 list_move(&tx->list, &priv->cm.reap_list);
1055 queue_work(ipoib_workqueue, &priv->cm.reap_task);
1056 ipoib_dbg(priv, "Reap connection for gid " IPOIB_GID_FMT "\n",
1057 IPOIB_GID_ARG(tx->neigh->dgid));
1058 tx->neigh = NULL;
1059 }
1060}
1061
1062static void ipoib_cm_tx_start(struct work_struct *work)
1063{
1064 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1065 cm.start_task);
1066 struct net_device *dev = priv->dev;
1067 struct ipoib_neigh *neigh;
1068 struct ipoib_cm_tx *p;
1069 unsigned long flags;
1070 int ret;
1071
1072 struct ib_sa_path_rec pathrec;
1073 u32 qpn;
1074
1075 spin_lock_irqsave(&priv->tx_lock, flags);
1076 spin_lock(&priv->lock);
1077 while (!list_empty(&priv->cm.start_list)) {
1078 p = list_entry(priv->cm.start_list.next, typeof(*p), list);
1079 list_del_init(&p->list);
1080 neigh = p->neigh;
1081 qpn = IPOIB_QPN(neigh->neighbour->ha);
1082 memcpy(&pathrec, &p->path->pathrec, sizeof pathrec);
1083 spin_unlock(&priv->lock);
1084 spin_unlock_irqrestore(&priv->tx_lock, flags);
1085 ret = ipoib_cm_tx_init(p, qpn, &pathrec);
1086 spin_lock_irqsave(&priv->tx_lock, flags);
1087 spin_lock(&priv->lock);
1088 if (ret) {
1089 neigh = p->neigh;
1090 if (neigh) {
1091 neigh->cm = NULL;
1092 list_del(&neigh->list);
1093 if (neigh->ah)
1094 ipoib_put_ah(neigh->ah);
1095 ipoib_neigh_free(dev, neigh);
1096 }
1097 list_del(&p->list);
1098 kfree(p);
1099 }
1100 }
1101 spin_unlock(&priv->lock);
1102 spin_unlock_irqrestore(&priv->tx_lock, flags);
1103}
1104
1105static void ipoib_cm_tx_reap(struct work_struct *work)
1106{
1107 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1108 cm.reap_task);
1109 struct ipoib_cm_tx *p;
839fcaba 1110
37aebbde 1111 spin_lock_irq(&priv->tx_lock);
839fcaba
MT		 1112 spin_lock(&priv->lock);
1113 while (!list_empty(&priv->cm.reap_list)) {
1114 p = list_entry(priv->cm.reap_list.next, typeof(*p), list);
1115 list_del(&p->list);
1116 spin_unlock(&priv->lock);
37aebbde 1117 spin_unlock_irq(&priv->tx_lock);
839fcaba 1118 ipoib_cm_tx_destroy(p);
37aebbde 1119 spin_lock_irq(&priv->tx_lock);
839fcaba
MT		 1120 spin_lock(&priv->lock);
1121 }
1122 spin_unlock(&priv->lock);
37aebbde 1123 spin_unlock_irq(&priv->tx_lock);
839fcaba
MT		 1124}
1125
1126static void ipoib_cm_skb_reap(struct work_struct *work)
1127{
1128 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1129 cm.skb_task);
839fcaba 1130 struct sk_buff *skb;
839fcaba
MT		 1131
1132 unsigned mtu = priv->mcast_mtu;
1133
37aebbde 1134 spin_lock_irq(&priv->tx_lock);
839fcaba
MT		 1135 spin_lock(&priv->lock);
1136 while ((skb = skb_dequeue(&priv->cm.skb_queue))) {
1137 spin_unlock(&priv->lock);
37aebbde 1138 spin_unlock_irq(&priv->tx_lock);
839fcaba
MT		 1139 if (skb->protocol == htons(ETH_P_IP))
1140 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu));
1141#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1142 else if (skb->protocol == htons(ETH_P_IPV6))
20089ca5 1143 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, priv->dev);
839fcaba
MT		 1144#endif
1145 dev_kfree_skb_any(skb);
37aebbde 1146 spin_lock_irq(&priv->tx_lock);
839fcaba
MT		 1147 spin_lock(&priv->lock);
1148 }
1149 spin_unlock(&priv->lock);
37aebbde 1150 spin_unlock_irq(&priv->tx_lock);
839fcaba
MT		 1151}
1152
1153void ipoib_cm_skb_too_long(struct net_device* dev, struct sk_buff *skb,
1154 unsigned int mtu)
1155{
1156 struct ipoib_dev_priv *priv = netdev_priv(dev);
1157 int e = skb_queue_empty(&priv->cm.skb_queue);
1158
1159 if (skb->dst)
1160 skb->dst->ops->update_pmtu(skb->dst, mtu);
1161
1162 skb_queue_tail(&priv->cm.skb_queue, skb);
1163 if (e)
1164 queue_work(ipoib_workqueue, &priv->cm.skb_task);
1165}
1166
518b1646
MT		 1167static void ipoib_cm_rx_reap(struct work_struct *work)
1168{
1169 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1170 cm.rx_reap_task);
1171 struct ipoib_cm_rx *p, *n;
1172 LIST_HEAD(list);
1173
1174 spin_lock_irq(&priv->lock);
1175 list_splice_init(&priv->cm.rx_reap_list, &list);
1176 spin_unlock_irq(&priv->lock);
1177
1178 list_for_each_entry_safe(p, n, &list, list) {
1179 ib_destroy_cm_id(p->id);
1180 ib_destroy_qp(p->qp);
1181 kfree(p);
1182 }
1183}
1184
839fcaba
MT		 1185static void ipoib_cm_stale_task(struct work_struct *work)
1186{
1187 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1188 cm.stale_task.work);
1189 struct ipoib_cm_rx *p;
518b1646 1190 int ret;
839fcaba 1191
37aebbde 1192 spin_lock_irq(&priv->lock);
839fcaba 1193 while (!list_empty(&priv->cm.passive_ids)) {
518b1646 1194 /* List is sorted by LRU, start from tail,
839fcaba
MT		 1195 * stop when we see a recently used entry */
1196 p = list_entry(priv->cm.passive_ids.prev, typeof(*p), list);
60a596da 1197 if (time_before_eq(jiffies, p->jiffies + IPOIB_CM_RX_TIMEOUT))
839fcaba 1198 break;
518b1646
MT		 1199 list_move(&p->list, &priv->cm.rx_error_list);
1200 p->state = IPOIB_CM_RX_ERROR;
37aebbde 1201 spin_unlock_irq(&priv->lock);
518b1646
MT		 1202 ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE);
1203 if (ret)
1204 ipoib_warn(priv, "unable to move qp to error state: %d\n", ret);
37aebbde 1205 spin_lock_irq(&priv->lock);
839fcaba 1206 }
7c5b9ef8
MT		 1207
1208 if (!list_empty(&priv->cm.passive_ids))
1209 queue_delayed_work(ipoib_workqueue,
1210 &priv->cm.stale_task, IPOIB_CM_RX_DELAY);
37aebbde 1211 spin_unlock_irq(&priv->lock);
839fcaba
MT		 1212}
1213
1214
1215static ssize_t show_mode(struct device *d, struct device_attribute *attr,
1216 char *buf)
1217{
1218 struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(d));
1219
1220 if (test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags))
1221 return sprintf(buf, "connected\n");
1222 else
1223 return sprintf(buf, "datagram\n");
1224}
1225
1226static ssize_t set_mode(struct device *d, struct device_attribute *attr,
1227 const char *buf, size_t count)
1228{
1229 struct net_device *dev = to_net_dev(d);
1230 struct ipoib_dev_priv *priv = netdev_priv(dev);
1231
1232 /* flush paths if we switch modes so that connections are restarted */
1233 if (IPOIB_CM_SUPPORTED(dev->dev_addr) && !strcmp(buf, "connected\n")) {
1234 set_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags);
1235 ipoib_warn(priv, "enabling connected mode "
1236 "will cause multicast packet drops\n");
1237 ipoib_flush_paths(dev);
1238 return count;
1239 }
1240
1241 if (!strcmp(buf, "datagram\n")) {
1242 clear_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags);
1243 dev->mtu = min(priv->mcast_mtu, dev->mtu);
1244 ipoib_flush_paths(dev);
1245 return count;
1246 }
1247
1248 return -EINVAL;
1249}
1250
551fd612 1251static DEVICE_ATTR(mode, S_IWUSR | S_IRUGO, show_mode, set_mode);
839fcaba
MT		 1252
1253int ipoib_cm_add_mode_attr(struct net_device *dev)
1254{
1255 return device_create_file(&dev->dev, &dev_attr_mode);
1256}
1257
1258int ipoib_cm_dev_init(struct net_device *dev)
1259{
1260 struct ipoib_dev_priv *priv = netdev_priv(dev);
1261 struct ib_srq_init_attr srq_init_attr = {
1262 .attr = {
1263 .max_wr = ipoib_recvq_size,
1264 .max_sge = IPOIB_CM_RX_SG
1265 }
1266 };
1267 int ret, i;
1268
1269 INIT_LIST_HEAD(&priv->cm.passive_ids);
1270 INIT_LIST_HEAD(&priv->cm.reap_list);
1271 INIT_LIST_HEAD(&priv->cm.start_list);
518b1646
MT		 1272 INIT_LIST_HEAD(&priv->cm.rx_error_list);
1273 INIT_LIST_HEAD(&priv->cm.rx_flush_list);
1274 INIT_LIST_HEAD(&priv->cm.rx_drain_list);
1275 INIT_LIST_HEAD(&priv->cm.rx_reap_list);
839fcaba
MT		 1276 INIT_WORK(&priv->cm.start_task, ipoib_cm_tx_start);
1277 INIT_WORK(&priv->cm.reap_task, ipoib_cm_tx_reap);
1278 INIT_WORK(&priv->cm.skb_task, ipoib_cm_skb_reap);
518b1646 1279 INIT_WORK(&priv->cm.rx_reap_task, ipoib_cm_rx_reap);
839fcaba
MT		 1280 INIT_DELAYED_WORK(&priv->cm.stale_task, ipoib_cm_stale_task);
1281
1282 skb_queue_head_init(&priv->cm.skb_queue);
1283
1284 priv->cm.srq = ib_create_srq(priv->pd, &srq_init_attr);
1285 if (IS_ERR(priv->cm.srq)) {
1286 ret = PTR_ERR(priv->cm.srq);
1287 priv->cm.srq = NULL;
1288 return ret;
1289 }
1290
1291 priv->cm.srq_ring = kzalloc(ipoib_recvq_size * sizeof *priv->cm.srq_ring,
1292 GFP_KERNEL);
1293 if (!priv->cm.srq_ring) {
1294 printk(KERN_WARNING "%s: failed to allocate CM ring (%d entries)\n",
1295 priv->ca->name, ipoib_recvq_size);
1296 ipoib_cm_dev_cleanup(dev);
1297 return -ENOMEM;
1298 }
1299
1300 for (i = 0; i < IPOIB_CM_RX_SG; ++i)
1301 priv->cm.rx_sge[i].lkey = priv->mr->lkey;
1302
1303 priv->cm.rx_sge[0].length = IPOIB_CM_HEAD_SIZE;
1304 for (i = 1; i < IPOIB_CM_RX_SG; ++i)
1305 priv->cm.rx_sge[i].length = PAGE_SIZE;
1306 priv->cm.rx_wr.next = NULL;
1307 priv->cm.rx_wr.sg_list = priv->cm.rx_sge;
1308 priv->cm.rx_wr.num_sge = IPOIB_CM_RX_SG;
1309
1310 for (i = 0; i < ipoib_recvq_size; ++i) {
1812063b
MT		 1311 if (!ipoib_cm_alloc_rx_skb(dev, i, IPOIB_CM_RX_SG - 1,
1312 priv->cm.srq_ring[i].mapping)) {
839fcaba
MT		 1313 ipoib_warn(priv, "failed to allocate receive buffer %d\n", i);
1314 ipoib_cm_dev_cleanup(dev);
1315 return -ENOMEM;
1316 }
1317 if (ipoib_cm_post_receive(dev, i)) {
1318 ipoib_warn(priv, "ipoib_ib_post_receive failed for buf %d\n", i);
1319 ipoib_cm_dev_cleanup(dev);
1320 return -EIO;
1321 }
1322 }
1323
1324 priv->dev->dev_addr[0] = IPOIB_FLAGS_RC;
1325 return 0;
1326}
1327
1328void ipoib_cm_dev_cleanup(struct net_device *dev)
1329{
1330 struct ipoib_dev_priv *priv = netdev_priv(dev);
1331 int i, ret;
1332
1333 if (!priv->cm.srq)
1334 return;
1335
1336 ipoib_dbg(priv, "Cleanup ipoib connected mode.\n");
1337
1338 ret = ib_destroy_srq(priv->cm.srq);
1339 if (ret)
1340 ipoib_warn(priv, "ib_destroy_srq failed: %d\n", ret);
1341
1342 priv->cm.srq = NULL;
1343 if (!priv->cm.srq_ring)
1344 return;
1345 for (i = 0; i < ipoib_recvq_size; ++i)
1346 if (priv->cm.srq_ring[i].skb) {
1812063b
MT		 1347 ipoib_cm_dma_unmap_rx(priv, IPOIB_CM_RX_SG - 1,
1348 priv->cm.srq_ring[i].mapping);
839fcaba
MT		 1349 dev_kfree_skb_any(priv->cm.srq_ring[i].skb);
1350 priv->cm.srq_ring[i].skb = NULL;
1351 }
1352 kfree(priv->cm.srq_ring);
1353 priv->cm.srq_ring = NULL;
1354}
Linux kernel - Deliverables
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