IPoIB/cm: Set correct SG list in ipoib_cm_init_rx_wr()
[safe/jmp/linux-2.6] / 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 <rdma/ib_cache.h>
35 #include <net/dst.h>
36 #include <net/icmp.h>
37 #include <linux/icmpv6.h>
38 #include <linux/delay.h>
39 #include <linux/vmalloc.h>
40
41 #include "ipoib.h"
42
43 int ipoib_max_conn_qp = 128;
44
45 module_param_named(max_nonsrq_conn_qp, ipoib_max_conn_qp, int, 0444);
46 MODULE_PARM_DESC(max_nonsrq_conn_qp,
47                  "Max number of connected-mode QPs per interface "
48                  "(applied only if shared receive queue is not available)");
49
50 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG_DATA
51 static int data_debug_level;
52
53 module_param_named(cm_data_debug_level, data_debug_level, int, 0644);
54 MODULE_PARM_DESC(cm_data_debug_level,
55                  "Enable data path debug tracing for connected mode if > 0");
56 #endif
57
58 #define IPOIB_CM_IETF_ID 0x1000000000000000ULL
59
60 #define IPOIB_CM_RX_UPDATE_TIME (256 * HZ)
61 #define IPOIB_CM_RX_TIMEOUT     (2 * 256 * HZ)
62 #define IPOIB_CM_RX_DELAY       (3 * 256 * HZ)
63 #define IPOIB_CM_RX_UPDATE_MASK (0x3)
64
65 static struct ib_qp_attr ipoib_cm_err_attr = {
66         .qp_state = IB_QPS_ERR
67 };
68
69 #define IPOIB_CM_RX_DRAIN_WRID 0xffffffff
70
71 static struct ib_send_wr ipoib_cm_rx_drain_wr = {
72         .wr_id = IPOIB_CM_RX_DRAIN_WRID,
73         .opcode = IB_WR_SEND,
74 };
75
76 static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id,
77                                struct ib_cm_event *event);
78
79 static void ipoib_cm_dma_unmap_rx(struct ipoib_dev_priv *priv, int frags,
80                                   u64 mapping[IPOIB_CM_RX_SG])
81 {
82         int i;
83
84         ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_CM_HEAD_SIZE, DMA_FROM_DEVICE);
85
86         for (i = 0; i < frags; ++i)
87                 ib_dma_unmap_single(priv->ca, mapping[i + 1], PAGE_SIZE, DMA_FROM_DEVICE);
88 }
89
90 static int ipoib_cm_post_receive_srq(struct net_device *dev, int id)
91 {
92         struct ipoib_dev_priv *priv = netdev_priv(dev);
93         struct ib_recv_wr *bad_wr;
94         int i, ret;
95
96         priv->cm.rx_wr.wr_id = id | IPOIB_OP_CM | IPOIB_OP_RECV;
97
98         for (i = 0; i < priv->cm.num_frags; ++i)
99                 priv->cm.rx_sge[i].addr = priv->cm.srq_ring[id].mapping[i];
100
101         ret = ib_post_srq_recv(priv->cm.srq, &priv->cm.rx_wr, &bad_wr);
102         if (unlikely(ret)) {
103                 ipoib_warn(priv, "post srq failed for buf %d (%d)\n", id, ret);
104                 ipoib_cm_dma_unmap_rx(priv, priv->cm.num_frags - 1,
105                                       priv->cm.srq_ring[id].mapping);
106                 dev_kfree_skb_any(priv->cm.srq_ring[id].skb);
107                 priv->cm.srq_ring[id].skb = NULL;
108         }
109
110         return ret;
111 }
112
113 static int ipoib_cm_post_receive_nonsrq(struct net_device *dev,
114                                         struct ipoib_cm_rx *rx,
115                                         struct ib_recv_wr *wr,
116                                         struct ib_sge *sge, int id)
117 {
118         struct ipoib_dev_priv *priv = netdev_priv(dev);
119         struct ib_recv_wr *bad_wr;
120         int i, ret;
121
122         wr->wr_id = id | IPOIB_OP_CM | IPOIB_OP_RECV;
123
124         for (i = 0; i < IPOIB_CM_RX_SG; ++i)
125                 sge[i].addr = rx->rx_ring[id].mapping[i];
126
127         ret = ib_post_recv(rx->qp, wr, &bad_wr);
128         if (unlikely(ret)) {
129                 ipoib_warn(priv, "post recv failed for buf %d (%d)\n", id, ret);
130                 ipoib_cm_dma_unmap_rx(priv, IPOIB_CM_RX_SG - 1,
131                                       rx->rx_ring[id].mapping);
132                 dev_kfree_skb_any(rx->rx_ring[id].skb);
133                 rx->rx_ring[id].skb = NULL;
134         }
135
136         return ret;
137 }
138
139 static struct sk_buff *ipoib_cm_alloc_rx_skb(struct net_device *dev,
140                                              struct ipoib_cm_rx_buf *rx_ring,
141                                              int id, int frags,
142                                              u64 mapping[IPOIB_CM_RX_SG])
143 {
144         struct ipoib_dev_priv *priv = netdev_priv(dev);
145         struct sk_buff *skb;
146         int i;
147
148         skb = dev_alloc_skb(IPOIB_CM_HEAD_SIZE + 12);
149         if (unlikely(!skb))
150                 return NULL;
151
152         /*
153          * IPoIB adds a 4 byte header. So we need 12 more bytes to align the
154          * IP header to a multiple of 16.
155          */
156         skb_reserve(skb, 12);
157
158         mapping[0] = ib_dma_map_single(priv->ca, skb->data, IPOIB_CM_HEAD_SIZE,
159                                        DMA_FROM_DEVICE);
160         if (unlikely(ib_dma_mapping_error(priv->ca, mapping[0]))) {
161                 dev_kfree_skb_any(skb);
162                 return NULL;
163         }
164
165         for (i = 0; i < frags; i++) {
166                 struct page *page = alloc_page(GFP_ATOMIC);
167
168                 if (!page)
169                         goto partial_error;
170                 skb_fill_page_desc(skb, i, page, 0, PAGE_SIZE);
171
172                 mapping[i + 1] = ib_dma_map_page(priv->ca, skb_shinfo(skb)->frags[i].page,
173                                                  0, PAGE_SIZE, DMA_FROM_DEVICE);
174                 if (unlikely(ib_dma_mapping_error(priv->ca, mapping[i + 1])))
175                         goto partial_error;
176         }
177
178         rx_ring[id].skb = skb;
179         return skb;
180
181 partial_error:
182
183         ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_CM_HEAD_SIZE, DMA_FROM_DEVICE);
184
185         for (; i > 0; --i)
186                 ib_dma_unmap_single(priv->ca, mapping[i], PAGE_SIZE, DMA_FROM_DEVICE);
187
188         dev_kfree_skb_any(skb);
189         return NULL;
190 }
191
192 static void ipoib_cm_free_rx_ring(struct net_device *dev,
193                                   struct ipoib_cm_rx_buf *rx_ring)
194 {
195         struct ipoib_dev_priv *priv = netdev_priv(dev);
196         int i;
197
198         for (i = 0; i < ipoib_recvq_size; ++i)
199                 if (rx_ring[i].skb) {
200                         ipoib_cm_dma_unmap_rx(priv, IPOIB_CM_RX_SG - 1,
201                                               rx_ring[i].mapping);
202                         dev_kfree_skb_any(rx_ring[i].skb);
203                 }
204
205         kfree(rx_ring);
206 }
207
208 static void ipoib_cm_start_rx_drain(struct ipoib_dev_priv *priv)
209 {
210         struct ib_send_wr *bad_wr;
211         struct ipoib_cm_rx *p;
212
213         /* We only reserved 1 extra slot in CQ for drain WRs, so
214          * make sure we have at most 1 outstanding WR. */
215         if (list_empty(&priv->cm.rx_flush_list) ||
216             !list_empty(&priv->cm.rx_drain_list))
217                 return;
218
219         /*
220          * QPs on flush list are error state.  This way, a "flush
221          * error" WC will be immediately generated for each WR we post.
222          */
223         p = list_entry(priv->cm.rx_flush_list.next, typeof(*p), list);
224         if (ib_post_send(p->qp, &ipoib_cm_rx_drain_wr, &bad_wr))
225                 ipoib_warn(priv, "failed to post drain wr\n");
226
227         list_splice_init(&priv->cm.rx_flush_list, &priv->cm.rx_drain_list);
228 }
229
230 static void ipoib_cm_rx_event_handler(struct ib_event *event, void *ctx)
231 {
232         struct ipoib_cm_rx *p = ctx;
233         struct ipoib_dev_priv *priv = netdev_priv(p->dev);
234         unsigned long flags;
235
236         if (event->event != IB_EVENT_QP_LAST_WQE_REACHED)
237                 return;
238
239         spin_lock_irqsave(&priv->lock, flags);
240         list_move(&p->list, &priv->cm.rx_flush_list);
241         p->state = IPOIB_CM_RX_FLUSH;
242         ipoib_cm_start_rx_drain(priv);
243         spin_unlock_irqrestore(&priv->lock, flags);
244 }
245
246 static struct ib_qp *ipoib_cm_create_rx_qp(struct net_device *dev,
247                                            struct ipoib_cm_rx *p)
248 {
249         struct ipoib_dev_priv *priv = netdev_priv(dev);
250         struct ib_qp_init_attr attr = {
251                 .event_handler = ipoib_cm_rx_event_handler,
252                 .send_cq = priv->recv_cq, /* For drain WR */
253                 .recv_cq = priv->recv_cq,
254                 .srq = priv->cm.srq,
255                 .cap.max_send_wr = 1, /* For drain WR */
256                 .cap.max_send_sge = 1, /* FIXME: 0 Seems not to work */
257                 .sq_sig_type = IB_SIGNAL_ALL_WR,
258                 .qp_type = IB_QPT_RC,
259                 .qp_context = p,
260         };
261
262         if (!ipoib_cm_has_srq(dev)) {
263                 attr.cap.max_recv_wr  = ipoib_recvq_size;
264                 attr.cap.max_recv_sge = IPOIB_CM_RX_SG;
265         }
266
267         return ib_create_qp(priv->pd, &attr);
268 }
269
270 static int ipoib_cm_modify_rx_qp(struct net_device *dev,
271                                  struct ib_cm_id *cm_id, struct ib_qp *qp,
272                                  unsigned psn)
273 {
274         struct ipoib_dev_priv *priv = netdev_priv(dev);
275         struct ib_qp_attr qp_attr;
276         int qp_attr_mask, ret;
277
278         qp_attr.qp_state = IB_QPS_INIT;
279         ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
280         if (ret) {
281                 ipoib_warn(priv, "failed to init QP attr for INIT: %d\n", ret);
282                 return ret;
283         }
284         ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
285         if (ret) {
286                 ipoib_warn(priv, "failed to modify QP to INIT: %d\n", ret);
287                 return ret;
288         }
289         qp_attr.qp_state = IB_QPS_RTR;
290         ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
291         if (ret) {
292                 ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret);
293                 return ret;
294         }
295         qp_attr.rq_psn = psn;
296         ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
297         if (ret) {
298                 ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret);
299                 return ret;
300         }
301
302         /*
303          * Current Mellanox HCA firmware won't generate completions
304          * with error for drain WRs unless the QP has been moved to
305          * RTS first. This work-around leaves a window where a QP has
306          * moved to error asynchronously, but this will eventually get
307          * fixed in firmware, so let's not error out if modify QP
308          * fails.
309          */
310         qp_attr.qp_state = IB_QPS_RTS;
311         ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
312         if (ret) {
313                 ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret);
314                 return 0;
315         }
316         ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
317         if (ret) {
318                 ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret);
319                 return 0;
320         }
321
322         return 0;
323 }
324
325 static void ipoib_cm_init_rx_wr(struct net_device *dev,
326                                 struct ib_recv_wr *wr,
327                                 struct ib_sge *sge)
328 {
329         struct ipoib_dev_priv *priv = netdev_priv(dev);
330         int i;
331
332         for (i = 0; i < priv->cm.num_frags; ++i)
333                 sge[i].lkey = priv->mr->lkey;
334
335         sge[0].length = IPOIB_CM_HEAD_SIZE;
336         for (i = 1; i < priv->cm.num_frags; ++i)
337                 sge[i].length = PAGE_SIZE;
338
339         wr->next    = NULL;
340         wr->sg_list = sge;
341         wr->num_sge = priv->cm.num_frags;
342 }
343
344 static int ipoib_cm_nonsrq_init_rx(struct net_device *dev, struct ib_cm_id *cm_id,
345                                    struct ipoib_cm_rx *rx)
346 {
347         struct ipoib_dev_priv *priv = netdev_priv(dev);
348         struct {
349                 struct ib_recv_wr wr;
350                 struct ib_sge sge[IPOIB_CM_RX_SG];
351         } *t;
352         int ret;
353         int i;
354
355         rx->rx_ring = kcalloc(ipoib_recvq_size, sizeof *rx->rx_ring, GFP_KERNEL);
356         if (!rx->rx_ring)
357                 return -ENOMEM;
358
359         t = kmalloc(sizeof *t, GFP_KERNEL);
360         if (!t) {
361                 ret = -ENOMEM;
362                 goto err_free;
363         }
364
365         ipoib_cm_init_rx_wr(dev, &t->wr, t->sge);
366
367         spin_lock_irq(&priv->lock);
368
369         if (priv->cm.nonsrq_conn_qp >= ipoib_max_conn_qp) {
370                 spin_unlock_irq(&priv->lock);
371                 ib_send_cm_rej(cm_id, IB_CM_REJ_NO_QP, NULL, 0, NULL, 0);
372                 ret = -EINVAL;
373                 goto err_free;
374         } else
375                 ++priv->cm.nonsrq_conn_qp;
376
377         spin_unlock_irq(&priv->lock);
378
379         for (i = 0; i < ipoib_recvq_size; ++i) {
380                 if (!ipoib_cm_alloc_rx_skb(dev, rx->rx_ring, i, IPOIB_CM_RX_SG - 1,
381                                            rx->rx_ring[i].mapping)) {
382                         ipoib_warn(priv, "failed to allocate receive buffer %d\n", i);
383                                 ret = -ENOMEM;
384                                 goto err_count;
385                 }
386                 ret = ipoib_cm_post_receive_nonsrq(dev, rx, &t->wr, t->sge, i);
387                 if (ret) {
388                         ipoib_warn(priv, "ipoib_cm_post_receive_nonsrq "
389                                    "failed for buf %d\n", i);
390                         ret = -EIO;
391                         goto err_count;
392                 }
393         }
394
395         rx->recv_count = ipoib_recvq_size;
396
397         kfree(t);
398
399         return 0;
400
401 err_count:
402         spin_lock_irq(&priv->lock);
403         --priv->cm.nonsrq_conn_qp;
404         spin_unlock_irq(&priv->lock);
405
406 err_free:
407         kfree(t);
408         ipoib_cm_free_rx_ring(dev, rx->rx_ring);
409
410         return ret;
411 }
412
413 static int ipoib_cm_send_rep(struct net_device *dev, struct ib_cm_id *cm_id,
414                              struct ib_qp *qp, struct ib_cm_req_event_param *req,
415                              unsigned psn)
416 {
417         struct ipoib_dev_priv *priv = netdev_priv(dev);
418         struct ipoib_cm_data data = {};
419         struct ib_cm_rep_param rep = {};
420
421         data.qpn = cpu_to_be32(priv->qp->qp_num);
422         data.mtu = cpu_to_be32(IPOIB_CM_BUF_SIZE);
423
424         rep.private_data = &data;
425         rep.private_data_len = sizeof data;
426         rep.flow_control = 0;
427         rep.rnr_retry_count = req->rnr_retry_count;
428         rep.srq = ipoib_cm_has_srq(dev);
429         rep.qp_num = qp->qp_num;
430         rep.starting_psn = psn;
431         return ib_send_cm_rep(cm_id, &rep);
432 }
433
434 static int ipoib_cm_req_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
435 {
436         struct net_device *dev = cm_id->context;
437         struct ipoib_dev_priv *priv = netdev_priv(dev);
438         struct ipoib_cm_rx *p;
439         unsigned psn;
440         int ret;
441
442         ipoib_dbg(priv, "REQ arrived\n");
443         p = kzalloc(sizeof *p, GFP_KERNEL);
444         if (!p)
445                 return -ENOMEM;
446         p->dev = dev;
447         p->id = cm_id;
448         cm_id->context = p;
449         p->state = IPOIB_CM_RX_LIVE;
450         p->jiffies = jiffies;
451         INIT_LIST_HEAD(&p->list);
452
453         p->qp = ipoib_cm_create_rx_qp(dev, p);
454         if (IS_ERR(p->qp)) {
455                 ret = PTR_ERR(p->qp);
456                 goto err_qp;
457         }
458
459         psn = random32() & 0xffffff;
460         ret = ipoib_cm_modify_rx_qp(dev, cm_id, p->qp, psn);
461         if (ret)
462                 goto err_modify;
463
464         if (!ipoib_cm_has_srq(dev)) {
465                 ret = ipoib_cm_nonsrq_init_rx(dev, cm_id, p);
466                 if (ret)
467                         goto err_modify;
468         }
469
470         spin_lock_irq(&priv->lock);
471         queue_delayed_work(ipoib_workqueue,
472                            &priv->cm.stale_task, IPOIB_CM_RX_DELAY);
473         /* Add this entry to passive ids list head, but do not re-add it
474          * if IB_EVENT_QP_LAST_WQE_REACHED has moved it to flush list. */
475         p->jiffies = jiffies;
476         if (p->state == IPOIB_CM_RX_LIVE)
477                 list_move(&p->list, &priv->cm.passive_ids);
478         spin_unlock_irq(&priv->lock);
479
480         ret = ipoib_cm_send_rep(dev, cm_id, p->qp, &event->param.req_rcvd, psn);
481         if (ret) {
482                 ipoib_warn(priv, "failed to send REP: %d\n", ret);
483                 if (ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE))
484                         ipoib_warn(priv, "unable to move qp to error state\n");
485         }
486         return 0;
487
488 err_modify:
489         ib_destroy_qp(p->qp);
490 err_qp:
491         kfree(p);
492         return ret;
493 }
494
495 static int ipoib_cm_rx_handler(struct ib_cm_id *cm_id,
496                                struct ib_cm_event *event)
497 {
498         struct ipoib_cm_rx *p;
499         struct ipoib_dev_priv *priv;
500
501         switch (event->event) {
502         case IB_CM_REQ_RECEIVED:
503                 return ipoib_cm_req_handler(cm_id, event);
504         case IB_CM_DREQ_RECEIVED:
505                 p = cm_id->context;
506                 ib_send_cm_drep(cm_id, NULL, 0);
507                 /* Fall through */
508         case IB_CM_REJ_RECEIVED:
509                 p = cm_id->context;
510                 priv = netdev_priv(p->dev);
511                 if (ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE))
512                         ipoib_warn(priv, "unable to move qp to error state\n");
513                 /* Fall through */
514         default:
515                 return 0;
516         }
517 }
518 /* Adjust length of skb with fragments to match received data */
519 static void skb_put_frags(struct sk_buff *skb, unsigned int hdr_space,
520                           unsigned int length, struct sk_buff *toskb)
521 {
522         int i, num_frags;
523         unsigned int size;
524
525         /* put header into skb */
526         size = min(length, hdr_space);
527         skb->tail += size;
528         skb->len += size;
529         length -= size;
530
531         num_frags = skb_shinfo(skb)->nr_frags;
532         for (i = 0; i < num_frags; i++) {
533                 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
534
535                 if (length == 0) {
536                         /* don't need this page */
537                         skb_fill_page_desc(toskb, i, frag->page, 0, PAGE_SIZE);
538                         --skb_shinfo(skb)->nr_frags;
539                 } else {
540                         size = min(length, (unsigned) PAGE_SIZE);
541
542                         frag->size = size;
543                         skb->data_len += size;
544                         skb->truesize += size;
545                         skb->len += size;
546                         length -= size;
547                 }
548         }
549 }
550
551 void ipoib_cm_handle_rx_wc(struct net_device *dev, struct ib_wc *wc)
552 {
553         struct ipoib_dev_priv *priv = netdev_priv(dev);
554         struct ipoib_cm_rx_buf *rx_ring;
555         unsigned int wr_id = wc->wr_id & ~(IPOIB_OP_CM | IPOIB_OP_RECV);
556         struct sk_buff *skb, *newskb;
557         struct ipoib_cm_rx *p;
558         unsigned long flags;
559         u64 mapping[IPOIB_CM_RX_SG];
560         int frags;
561         int has_srq;
562         struct sk_buff *small_skb;
563
564         ipoib_dbg_data(priv, "cm recv completion: id %d, status: %d\n",
565                        wr_id, wc->status);
566
567         if (unlikely(wr_id >= ipoib_recvq_size)) {
568                 if (wr_id == (IPOIB_CM_RX_DRAIN_WRID & ~(IPOIB_OP_CM | IPOIB_OP_RECV))) {
569                         spin_lock_irqsave(&priv->lock, flags);
570                         list_splice_init(&priv->cm.rx_drain_list, &priv->cm.rx_reap_list);
571                         ipoib_cm_start_rx_drain(priv);
572                         queue_work(ipoib_workqueue, &priv->cm.rx_reap_task);
573                         spin_unlock_irqrestore(&priv->lock, flags);
574                 } else
575                         ipoib_warn(priv, "cm recv completion event with wrid %d (> %d)\n",
576                                    wr_id, ipoib_recvq_size);
577                 return;
578         }
579
580         p = wc->qp->qp_context;
581
582         has_srq = ipoib_cm_has_srq(dev);
583         rx_ring = has_srq ? priv->cm.srq_ring : p->rx_ring;
584
585         skb = rx_ring[wr_id].skb;
586
587         if (unlikely(wc->status != IB_WC_SUCCESS)) {
588                 ipoib_dbg(priv, "cm recv error "
589                            "(status=%d, wrid=%d vend_err %x)\n",
590                            wc->status, wr_id, wc->vendor_err);
591                 ++dev->stats.rx_dropped;
592                 if (has_srq)
593                         goto repost;
594                 else {
595                         if (!--p->recv_count) {
596                                 spin_lock_irqsave(&priv->lock, flags);
597                                 list_move(&p->list, &priv->cm.rx_reap_list);
598                                 spin_unlock_irqrestore(&priv->lock, flags);
599                                 queue_work(ipoib_workqueue, &priv->cm.rx_reap_task);
600                         }
601                         return;
602                 }
603         }
604
605         if (unlikely(!(wr_id & IPOIB_CM_RX_UPDATE_MASK))) {
606                 if (p && time_after_eq(jiffies, p->jiffies + IPOIB_CM_RX_UPDATE_TIME)) {
607                         spin_lock_irqsave(&priv->lock, flags);
608                         p->jiffies = jiffies;
609                         /* Move this entry to list head, but do not re-add it
610                          * if it has been moved out of list. */
611                         if (p->state == IPOIB_CM_RX_LIVE)
612                                 list_move(&p->list, &priv->cm.passive_ids);
613                         spin_unlock_irqrestore(&priv->lock, flags);
614                 }
615         }
616
617         if (wc->byte_len < IPOIB_CM_COPYBREAK) {
618                 int dlen = wc->byte_len;
619
620                 small_skb = dev_alloc_skb(dlen + 12);
621                 if (small_skb) {
622                         skb_reserve(small_skb, 12);
623                         ib_dma_sync_single_for_cpu(priv->ca, rx_ring[wr_id].mapping[0],
624                                                    dlen, DMA_FROM_DEVICE);
625                         skb_copy_from_linear_data(skb, small_skb->data, dlen);
626                         ib_dma_sync_single_for_device(priv->ca, rx_ring[wr_id].mapping[0],
627                                                       dlen, DMA_FROM_DEVICE);
628                         skb_put(small_skb, dlen);
629                         skb = small_skb;
630                         goto copied;
631                 }
632         }
633
634         frags = PAGE_ALIGN(wc->byte_len - min(wc->byte_len,
635                                               (unsigned)IPOIB_CM_HEAD_SIZE)) / PAGE_SIZE;
636
637         newskb = ipoib_cm_alloc_rx_skb(dev, rx_ring, wr_id, frags, mapping);
638         if (unlikely(!newskb)) {
639                 /*
640                  * If we can't allocate a new RX buffer, dump
641                  * this packet and reuse the old buffer.
642                  */
643                 ipoib_dbg(priv, "failed to allocate receive buffer %d\n", wr_id);
644                 ++dev->stats.rx_dropped;
645                 goto repost;
646         }
647
648         ipoib_cm_dma_unmap_rx(priv, frags, rx_ring[wr_id].mapping);
649         memcpy(rx_ring[wr_id].mapping, mapping, (frags + 1) * sizeof *mapping);
650
651         ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n",
652                        wc->byte_len, wc->slid);
653
654         skb_put_frags(skb, IPOIB_CM_HEAD_SIZE, wc->byte_len, newskb);
655
656 copied:
657         skb->protocol = ((struct ipoib_header *) skb->data)->proto;
658         skb_reset_mac_header(skb);
659         skb_pull(skb, IPOIB_ENCAP_LEN);
660
661         dev->last_rx = jiffies;
662         ++dev->stats.rx_packets;
663         dev->stats.rx_bytes += skb->len;
664
665         skb->dev = dev;
666         /* XXX get correct PACKET_ type here */
667         skb->pkt_type = PACKET_HOST;
668         netif_receive_skb(skb);
669
670 repost:
671         if (has_srq) {
672                 if (unlikely(ipoib_cm_post_receive_srq(dev, wr_id)))
673                         ipoib_warn(priv, "ipoib_cm_post_receive_srq failed "
674                                    "for buf %d\n", wr_id);
675         } else {
676                 if (unlikely(ipoib_cm_post_receive_nonsrq(dev, p,
677                                                           &priv->cm.rx_wr,
678                                                           priv->cm.rx_sge,
679                                                           wr_id))) {
680                         --p->recv_count;
681                         ipoib_warn(priv, "ipoib_cm_post_receive_nonsrq failed "
682                                    "for buf %d\n", wr_id);
683                 }
684         }
685 }
686
687 static inline int post_send(struct ipoib_dev_priv *priv,
688                             struct ipoib_cm_tx *tx,
689                             unsigned int wr_id,
690                             u64 addr, int len)
691 {
692         struct ib_send_wr *bad_wr;
693
694         priv->tx_sge[0].addr          = addr;
695         priv->tx_sge[0].length        = len;
696
697         priv->tx_wr.num_sge     = 1;
698         priv->tx_wr.wr_id       = wr_id | IPOIB_OP_CM;
699
700         return ib_post_send(tx->qp, &priv->tx_wr, &bad_wr);
701 }
702
703 void ipoib_cm_send(struct net_device *dev, struct sk_buff *skb, struct ipoib_cm_tx *tx)
704 {
705         struct ipoib_dev_priv *priv = netdev_priv(dev);
706         struct ipoib_cm_tx_buf *tx_req;
707         u64 addr;
708
709         if (unlikely(skb->len > tx->mtu)) {
710                 ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n",
711                            skb->len, tx->mtu);
712                 ++dev->stats.tx_dropped;
713                 ++dev->stats.tx_errors;
714                 ipoib_cm_skb_too_long(dev, skb, tx->mtu - IPOIB_ENCAP_LEN);
715                 return;
716         }
717
718         ipoib_dbg_data(priv, "sending packet: head 0x%x length %d connection 0x%x\n",
719                        tx->tx_head, skb->len, tx->qp->qp_num);
720
721         /*
722          * We put the skb into the tx_ring _before_ we call post_send()
723          * because it's entirely possible that the completion handler will
724          * run before we execute anything after the post_send().  That
725          * means we have to make sure everything is properly recorded and
726          * our state is consistent before we call post_send().
727          */
728         tx_req = &tx->tx_ring[tx->tx_head & (ipoib_sendq_size - 1)];
729         tx_req->skb = skb;
730         addr = ib_dma_map_single(priv->ca, skb->data, skb->len, DMA_TO_DEVICE);
731         if (unlikely(ib_dma_mapping_error(priv->ca, addr))) {
732                 ++dev->stats.tx_errors;
733                 dev_kfree_skb_any(skb);
734                 return;
735         }
736
737         tx_req->mapping = addr;
738
739         if (unlikely(post_send(priv, tx, tx->tx_head & (ipoib_sendq_size - 1),
740                                addr, skb->len))) {
741                 ipoib_warn(priv, "post_send failed\n");
742                 ++dev->stats.tx_errors;
743                 ib_dma_unmap_single(priv->ca, addr, skb->len, DMA_TO_DEVICE);
744                 dev_kfree_skb_any(skb);
745         } else {
746                 dev->trans_start = jiffies;
747                 ++tx->tx_head;
748
749                 if (++priv->tx_outstanding == ipoib_sendq_size) {
750                         ipoib_dbg(priv, "TX ring 0x%x full, stopping kernel net queue\n",
751                                   tx->qp->qp_num);
752                         netif_stop_queue(dev);
753                 }
754         }
755 }
756
757 void ipoib_cm_handle_tx_wc(struct net_device *dev, struct ib_wc *wc)
758 {
759         struct ipoib_dev_priv *priv = netdev_priv(dev);
760         struct ipoib_cm_tx *tx = wc->qp->qp_context;
761         unsigned int wr_id = wc->wr_id & ~IPOIB_OP_CM;
762         struct ipoib_cm_tx_buf *tx_req;
763         unsigned long flags;
764
765         ipoib_dbg_data(priv, "cm send completion: id %d, status: %d\n",
766                        wr_id, wc->status);
767
768         if (unlikely(wr_id >= ipoib_sendq_size)) {
769                 ipoib_warn(priv, "cm send completion event with wrid %d (> %d)\n",
770                            wr_id, ipoib_sendq_size);
771                 return;
772         }
773
774         tx_req = &tx->tx_ring[wr_id];
775
776         ib_dma_unmap_single(priv->ca, tx_req->mapping, tx_req->skb->len, DMA_TO_DEVICE);
777
778         /* FIXME: is this right? Shouldn't we only increment on success? */
779         ++dev->stats.tx_packets;
780         dev->stats.tx_bytes += tx_req->skb->len;
781
782         dev_kfree_skb_any(tx_req->skb);
783
784         spin_lock_irqsave(&priv->tx_lock, flags);
785         ++tx->tx_tail;
786         if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) &&
787             netif_queue_stopped(dev) &&
788             test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
789                 netif_wake_queue(dev);
790
791         if (wc->status != IB_WC_SUCCESS &&
792             wc->status != IB_WC_WR_FLUSH_ERR) {
793                 struct ipoib_neigh *neigh;
794
795                 ipoib_dbg(priv, "failed cm send event "
796                            "(status=%d, wrid=%d vend_err %x)\n",
797                            wc->status, wr_id, wc->vendor_err);
798
799                 spin_lock(&priv->lock);
800                 neigh = tx->neigh;
801
802                 if (neigh) {
803                         neigh->cm = NULL;
804                         list_del(&neigh->list);
805                         if (neigh->ah)
806                                 ipoib_put_ah(neigh->ah);
807                         ipoib_neigh_free(dev, neigh);
808
809                         tx->neigh = NULL;
810                 }
811
812                 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
813                         list_move(&tx->list, &priv->cm.reap_list);
814                         queue_work(ipoib_workqueue, &priv->cm.reap_task);
815                 }
816
817                 clear_bit(IPOIB_FLAG_OPER_UP, &tx->flags);
818
819                 spin_unlock(&priv->lock);
820         }
821
822         spin_unlock_irqrestore(&priv->tx_lock, flags);
823 }
824
825 int ipoib_cm_dev_open(struct net_device *dev)
826 {
827         struct ipoib_dev_priv *priv = netdev_priv(dev);
828         int ret;
829
830         if (!IPOIB_CM_SUPPORTED(dev->dev_addr))
831                 return 0;
832
833         priv->cm.id = ib_create_cm_id(priv->ca, ipoib_cm_rx_handler, dev);
834         if (IS_ERR(priv->cm.id)) {
835                 printk(KERN_WARNING "%s: failed to create CM ID\n", priv->ca->name);
836                 ret = PTR_ERR(priv->cm.id);
837                 goto err_cm;
838         }
839
840         ret = ib_cm_listen(priv->cm.id, cpu_to_be64(IPOIB_CM_IETF_ID | priv->qp->qp_num),
841                            0, NULL);
842         if (ret) {
843                 printk(KERN_WARNING "%s: failed to listen on ID 0x%llx\n", priv->ca->name,
844                        IPOIB_CM_IETF_ID | priv->qp->qp_num);
845                 goto err_listen;
846         }
847
848         return 0;
849
850 err_listen:
851         ib_destroy_cm_id(priv->cm.id);
852 err_cm:
853         priv->cm.id = NULL;
854         return ret;
855 }
856
857 static void ipoib_cm_free_rx_reap_list(struct net_device *dev)
858 {
859         struct ipoib_dev_priv *priv = netdev_priv(dev);
860         struct ipoib_cm_rx *rx, *n;
861         LIST_HEAD(list);
862
863         spin_lock_irq(&priv->lock);
864         list_splice_init(&priv->cm.rx_reap_list, &list);
865         spin_unlock_irq(&priv->lock);
866
867         list_for_each_entry_safe(rx, n, &list, list) {
868                 ib_destroy_cm_id(rx->id);
869                 ib_destroy_qp(rx->qp);
870                 if (!ipoib_cm_has_srq(dev)) {
871                         ipoib_cm_free_rx_ring(priv->dev, rx->rx_ring);
872                         spin_lock_irq(&priv->lock);
873                         --priv->cm.nonsrq_conn_qp;
874                         spin_unlock_irq(&priv->lock);
875                 }
876                 kfree(rx);
877         }
878 }
879
880 void ipoib_cm_dev_stop(struct net_device *dev)
881 {
882         struct ipoib_dev_priv *priv = netdev_priv(dev);
883         struct ipoib_cm_rx *p;
884         unsigned long begin;
885         int ret;
886
887         if (!IPOIB_CM_SUPPORTED(dev->dev_addr) || !priv->cm.id)
888                 return;
889
890         ib_destroy_cm_id(priv->cm.id);
891         priv->cm.id = NULL;
892
893         spin_lock_irq(&priv->lock);
894         while (!list_empty(&priv->cm.passive_ids)) {
895                 p = list_entry(priv->cm.passive_ids.next, typeof(*p), list);
896                 list_move(&p->list, &priv->cm.rx_error_list);
897                 p->state = IPOIB_CM_RX_ERROR;
898                 spin_unlock_irq(&priv->lock);
899                 ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE);
900                 if (ret)
901                         ipoib_warn(priv, "unable to move qp to error state: %d\n", ret);
902                 spin_lock_irq(&priv->lock);
903         }
904
905         /* Wait for all RX to be drained */
906         begin = jiffies;
907
908         while (!list_empty(&priv->cm.rx_error_list) ||
909                !list_empty(&priv->cm.rx_flush_list) ||
910                !list_empty(&priv->cm.rx_drain_list)) {
911                 if (time_after(jiffies, begin + 5 * HZ)) {
912                         ipoib_warn(priv, "RX drain timing out\n");
913
914                         /*
915                          * assume the HW is wedged and just free up everything.
916                          */
917                         list_splice_init(&priv->cm.rx_flush_list,
918                                          &priv->cm.rx_reap_list);
919                         list_splice_init(&priv->cm.rx_error_list,
920                                          &priv->cm.rx_reap_list);
921                         list_splice_init(&priv->cm.rx_drain_list,
922                                          &priv->cm.rx_reap_list);
923                         break;
924                 }
925                 spin_unlock_irq(&priv->lock);
926                 msleep(1);
927                 ipoib_drain_cq(dev);
928                 spin_lock_irq(&priv->lock);
929         }
930
931         spin_unlock_irq(&priv->lock);
932
933         ipoib_cm_free_rx_reap_list(dev);
934
935         cancel_delayed_work(&priv->cm.stale_task);
936 }
937
938 static int ipoib_cm_rep_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
939 {
940         struct ipoib_cm_tx *p = cm_id->context;
941         struct ipoib_dev_priv *priv = netdev_priv(p->dev);
942         struct ipoib_cm_data *data = event->private_data;
943         struct sk_buff_head skqueue;
944         struct ib_qp_attr qp_attr;
945         int qp_attr_mask, ret;
946         struct sk_buff *skb;
947
948         p->mtu = be32_to_cpu(data->mtu);
949
950         if (p->mtu <= IPOIB_ENCAP_LEN) {
951                 ipoib_warn(priv, "Rejecting connection: mtu %d <= %d\n",
952                            p->mtu, IPOIB_ENCAP_LEN);
953                 return -EINVAL;
954         }
955
956         qp_attr.qp_state = IB_QPS_RTR;
957         ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
958         if (ret) {
959                 ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret);
960                 return ret;
961         }
962
963         qp_attr.rq_psn = 0 /* FIXME */;
964         ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask);
965         if (ret) {
966                 ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret);
967                 return ret;
968         }
969
970         qp_attr.qp_state = IB_QPS_RTS;
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 RTS: %d\n", ret);
974                 return ret;
975         }
976         ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask);
977         if (ret) {
978                 ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret);
979                 return ret;
980         }
981
982         skb_queue_head_init(&skqueue);
983
984         spin_lock_irq(&priv->lock);
985         set_bit(IPOIB_FLAG_OPER_UP, &p->flags);
986         if (p->neigh)
987                 while ((skb = __skb_dequeue(&p->neigh->queue)))
988                         __skb_queue_tail(&skqueue, skb);
989         spin_unlock_irq(&priv->lock);
990
991         while ((skb = __skb_dequeue(&skqueue))) {
992                 skb->dev = p->dev;
993                 if (dev_queue_xmit(skb))
994                         ipoib_warn(priv, "dev_queue_xmit failed "
995                                    "to requeue packet\n");
996         }
997
998         ret = ib_send_cm_rtu(cm_id, NULL, 0);
999         if (ret) {
1000                 ipoib_warn(priv, "failed to send RTU: %d\n", ret);
1001                 return ret;
1002         }
1003         return 0;
1004 }
1005
1006 static struct ib_qp *ipoib_cm_create_tx_qp(struct net_device *dev, struct ipoib_cm_tx *tx)
1007 {
1008         struct ipoib_dev_priv *priv = netdev_priv(dev);
1009         struct ib_qp_init_attr attr = {
1010                 .send_cq                = priv->recv_cq,
1011                 .recv_cq                = priv->recv_cq,
1012                 .srq                    = priv->cm.srq,
1013                 .cap.max_send_wr        = ipoib_sendq_size,
1014                 .cap.max_send_sge       = 1,
1015                 .sq_sig_type            = IB_SIGNAL_ALL_WR,
1016                 .qp_type                = IB_QPT_RC,
1017                 .qp_context             = tx
1018         };
1019
1020         return ib_create_qp(priv->pd, &attr);
1021 }
1022
1023 static int ipoib_cm_send_req(struct net_device *dev,
1024                              struct ib_cm_id *id, struct ib_qp *qp,
1025                              u32 qpn,
1026                              struct ib_sa_path_rec *pathrec)
1027 {
1028         struct ipoib_dev_priv *priv = netdev_priv(dev);
1029         struct ipoib_cm_data data = {};
1030         struct ib_cm_req_param req = {};
1031
1032         data.qpn = cpu_to_be32(priv->qp->qp_num);
1033         data.mtu = cpu_to_be32(IPOIB_CM_BUF_SIZE);
1034
1035         req.primary_path                = pathrec;
1036         req.alternate_path              = NULL;
1037         req.service_id                  = cpu_to_be64(IPOIB_CM_IETF_ID | qpn);
1038         req.qp_num                      = qp->qp_num;
1039         req.qp_type                     = qp->qp_type;
1040         req.private_data                = &data;
1041         req.private_data_len            = sizeof data;
1042         req.flow_control                = 0;
1043
1044         req.starting_psn                = 0; /* FIXME */
1045
1046         /*
1047          * Pick some arbitrary defaults here; we could make these
1048          * module parameters if anyone cared about setting them.
1049          */
1050         req.responder_resources         = 4;
1051         req.remote_cm_response_timeout  = 20;
1052         req.local_cm_response_timeout   = 20;
1053         req.retry_count                 = 0; /* RFC draft warns against retries */
1054         req.rnr_retry_count             = 0; /* RFC draft warns against retries */
1055         req.max_cm_retries              = 15;
1056         req.srq                         = ipoib_cm_has_srq(dev);
1057         return ib_send_cm_req(id, &req);
1058 }
1059
1060 static int ipoib_cm_modify_tx_init(struct net_device *dev,
1061                                   struct ib_cm_id *cm_id, struct ib_qp *qp)
1062 {
1063         struct ipoib_dev_priv *priv = netdev_priv(dev);
1064         struct ib_qp_attr qp_attr;
1065         int qp_attr_mask, ret;
1066         ret = ib_find_pkey(priv->ca, priv->port, priv->pkey, &qp_attr.pkey_index);
1067         if (ret) {
1068                 ipoib_warn(priv, "pkey 0x%x not found: %d\n", priv->pkey, ret);
1069                 return ret;
1070         }
1071
1072         qp_attr.qp_state = IB_QPS_INIT;
1073         qp_attr.qp_access_flags = IB_ACCESS_LOCAL_WRITE;
1074         qp_attr.port_num = priv->port;
1075         qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS | IB_QP_PKEY_INDEX | IB_QP_PORT;
1076
1077         ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
1078         if (ret) {
1079                 ipoib_warn(priv, "failed to modify tx QP to INIT: %d\n", ret);
1080                 return ret;
1081         }
1082         return 0;
1083 }
1084
1085 static int ipoib_cm_tx_init(struct ipoib_cm_tx *p, u32 qpn,
1086                             struct ib_sa_path_rec *pathrec)
1087 {
1088         struct ipoib_dev_priv *priv = netdev_priv(p->dev);
1089         int ret;
1090
1091         p->tx_ring = vmalloc(ipoib_sendq_size * sizeof *p->tx_ring);
1092         if (!p->tx_ring) {
1093                 ipoib_warn(priv, "failed to allocate tx ring\n");
1094                 ret = -ENOMEM;
1095                 goto err_tx;
1096         }
1097         memset(p->tx_ring, 0, ipoib_sendq_size * sizeof *p->tx_ring);
1098
1099         p->qp = ipoib_cm_create_tx_qp(p->dev, p);
1100         if (IS_ERR(p->qp)) {
1101                 ret = PTR_ERR(p->qp);
1102                 ipoib_warn(priv, "failed to allocate tx qp: %d\n", ret);
1103                 goto err_qp;
1104         }
1105
1106         p->id = ib_create_cm_id(priv->ca, ipoib_cm_tx_handler, p);
1107         if (IS_ERR(p->id)) {
1108                 ret = PTR_ERR(p->id);
1109                 ipoib_warn(priv, "failed to create tx cm id: %d\n", ret);
1110                 goto err_id;
1111         }
1112
1113         ret = ipoib_cm_modify_tx_init(p->dev, p->id,  p->qp);
1114         if (ret) {
1115                 ipoib_warn(priv, "failed to modify tx qp to rtr: %d\n", ret);
1116                 goto err_modify;
1117         }
1118
1119         ret = ipoib_cm_send_req(p->dev, p->id, p->qp, qpn, pathrec);
1120         if (ret) {
1121                 ipoib_warn(priv, "failed to send cm req: %d\n", ret);
1122                 goto err_send_cm;
1123         }
1124
1125         ipoib_dbg(priv, "Request connection 0x%x for gid " IPOIB_GID_FMT " qpn 0x%x\n",
1126                   p->qp->qp_num, IPOIB_GID_ARG(pathrec->dgid), qpn);
1127
1128         return 0;
1129
1130 err_send_cm:
1131 err_modify:
1132         ib_destroy_cm_id(p->id);
1133 err_id:
1134         p->id = NULL;
1135         ib_destroy_qp(p->qp);
1136 err_qp:
1137         p->qp = NULL;
1138         vfree(p->tx_ring);
1139 err_tx:
1140         return ret;
1141 }
1142
1143 static void ipoib_cm_tx_destroy(struct ipoib_cm_tx *p)
1144 {
1145         struct ipoib_dev_priv *priv = netdev_priv(p->dev);
1146         struct ipoib_cm_tx_buf *tx_req;
1147         unsigned long flags;
1148         unsigned long begin;
1149
1150         ipoib_dbg(priv, "Destroy active connection 0x%x head 0x%x tail 0x%x\n",
1151                   p->qp ? p->qp->qp_num : 0, p->tx_head, p->tx_tail);
1152
1153         if (p->id)
1154                 ib_destroy_cm_id(p->id);
1155
1156         if (p->tx_ring) {
1157                 /* Wait for all sends to complete */
1158                 begin = jiffies;
1159                 while ((int) p->tx_tail - (int) p->tx_head < 0) {
1160                         if (time_after(jiffies, begin + 5 * HZ)) {
1161                                 ipoib_warn(priv, "timing out; %d sends not completed\n",
1162                                            p->tx_head - p->tx_tail);
1163                                 goto timeout;
1164                         }
1165
1166                         msleep(1);
1167                 }
1168         }
1169
1170 timeout:
1171
1172         while ((int) p->tx_tail - (int) p->tx_head < 0) {
1173                 tx_req = &p->tx_ring[p->tx_tail & (ipoib_sendq_size - 1)];
1174                 ib_dma_unmap_single(priv->ca, tx_req->mapping, tx_req->skb->len,
1175                                     DMA_TO_DEVICE);
1176                 dev_kfree_skb_any(tx_req->skb);
1177                 ++p->tx_tail;
1178                 spin_lock_irqsave(&priv->tx_lock, flags);
1179                 if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) &&
1180                     netif_queue_stopped(p->dev) &&
1181                     test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
1182                         netif_wake_queue(p->dev);
1183                 spin_unlock_irqrestore(&priv->tx_lock, flags);
1184         }
1185
1186         if (p->qp)
1187                 ib_destroy_qp(p->qp);
1188
1189         vfree(p->tx_ring);
1190         kfree(p);
1191 }
1192
1193 static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id,
1194                                struct ib_cm_event *event)
1195 {
1196         struct ipoib_cm_tx *tx = cm_id->context;
1197         struct ipoib_dev_priv *priv = netdev_priv(tx->dev);
1198         struct net_device *dev = priv->dev;
1199         struct ipoib_neigh *neigh;
1200         int ret;
1201
1202         switch (event->event) {
1203         case IB_CM_DREQ_RECEIVED:
1204                 ipoib_dbg(priv, "DREQ received.\n");
1205                 ib_send_cm_drep(cm_id, NULL, 0);
1206                 break;
1207         case IB_CM_REP_RECEIVED:
1208                 ipoib_dbg(priv, "REP received.\n");
1209                 ret = ipoib_cm_rep_handler(cm_id, event);
1210                 if (ret)
1211                         ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
1212                                        NULL, 0, NULL, 0);
1213                 break;
1214         case IB_CM_REQ_ERROR:
1215         case IB_CM_REJ_RECEIVED:
1216         case IB_CM_TIMEWAIT_EXIT:
1217                 ipoib_dbg(priv, "CM error %d.\n", event->event);
1218                 spin_lock_irq(&priv->tx_lock);
1219                 spin_lock(&priv->lock);
1220                 neigh = tx->neigh;
1221
1222                 if (neigh) {
1223                         neigh->cm = NULL;
1224                         list_del(&neigh->list);
1225                         if (neigh->ah)
1226                                 ipoib_put_ah(neigh->ah);
1227                         ipoib_neigh_free(dev, neigh);
1228
1229                         tx->neigh = NULL;
1230                 }
1231
1232                 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
1233                         list_move(&tx->list, &priv->cm.reap_list);
1234                         queue_work(ipoib_workqueue, &priv->cm.reap_task);
1235                 }
1236
1237                 spin_unlock(&priv->lock);
1238                 spin_unlock_irq(&priv->tx_lock);
1239                 break;
1240         default:
1241                 break;
1242         }
1243
1244         return 0;
1245 }
1246
1247 struct ipoib_cm_tx *ipoib_cm_create_tx(struct net_device *dev, struct ipoib_path *path,
1248                                        struct ipoib_neigh *neigh)
1249 {
1250         struct ipoib_dev_priv *priv = netdev_priv(dev);
1251         struct ipoib_cm_tx *tx;
1252
1253         tx = kzalloc(sizeof *tx, GFP_ATOMIC);
1254         if (!tx)
1255                 return NULL;
1256
1257         neigh->cm = tx;
1258         tx->neigh = neigh;
1259         tx->path = path;
1260         tx->dev = dev;
1261         list_add(&tx->list, &priv->cm.start_list);
1262         set_bit(IPOIB_FLAG_INITIALIZED, &tx->flags);
1263         queue_work(ipoib_workqueue, &priv->cm.start_task);
1264         return tx;
1265 }
1266
1267 void ipoib_cm_destroy_tx(struct ipoib_cm_tx *tx)
1268 {
1269         struct ipoib_dev_priv *priv = netdev_priv(tx->dev);
1270         if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
1271                 list_move(&tx->list, &priv->cm.reap_list);
1272                 queue_work(ipoib_workqueue, &priv->cm.reap_task);
1273                 ipoib_dbg(priv, "Reap connection for gid " IPOIB_GID_FMT "\n",
1274                           IPOIB_GID_ARG(tx->neigh->dgid));
1275                 tx->neigh = NULL;
1276         }
1277 }
1278
1279 static void ipoib_cm_tx_start(struct work_struct *work)
1280 {
1281         struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1282                                                    cm.start_task);
1283         struct net_device *dev = priv->dev;
1284         struct ipoib_neigh *neigh;
1285         struct ipoib_cm_tx *p;
1286         unsigned long flags;
1287         int ret;
1288
1289         struct ib_sa_path_rec pathrec;
1290         u32 qpn;
1291
1292         spin_lock_irqsave(&priv->tx_lock, flags);
1293         spin_lock(&priv->lock);
1294         while (!list_empty(&priv->cm.start_list)) {
1295                 p = list_entry(priv->cm.start_list.next, typeof(*p), list);
1296                 list_del_init(&p->list);
1297                 neigh = p->neigh;
1298                 qpn = IPOIB_QPN(neigh->neighbour->ha);
1299                 memcpy(&pathrec, &p->path->pathrec, sizeof pathrec);
1300                 spin_unlock(&priv->lock);
1301                 spin_unlock_irqrestore(&priv->tx_lock, flags);
1302                 ret = ipoib_cm_tx_init(p, qpn, &pathrec);
1303                 spin_lock_irqsave(&priv->tx_lock, flags);
1304                 spin_lock(&priv->lock);
1305                 if (ret) {
1306                         neigh = p->neigh;
1307                         if (neigh) {
1308                                 neigh->cm = NULL;
1309                                 list_del(&neigh->list);
1310                                 if (neigh->ah)
1311                                         ipoib_put_ah(neigh->ah);
1312                                 ipoib_neigh_free(dev, neigh);
1313                         }
1314                         list_del(&p->list);
1315                         kfree(p);
1316                 }
1317         }
1318         spin_unlock(&priv->lock);
1319         spin_unlock_irqrestore(&priv->tx_lock, flags);
1320 }
1321
1322 static void ipoib_cm_tx_reap(struct work_struct *work)
1323 {
1324         struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1325                                                    cm.reap_task);
1326         struct ipoib_cm_tx *p;
1327
1328         spin_lock_irq(&priv->tx_lock);
1329         spin_lock(&priv->lock);
1330         while (!list_empty(&priv->cm.reap_list)) {
1331                 p = list_entry(priv->cm.reap_list.next, typeof(*p), list);
1332                 list_del(&p->list);
1333                 spin_unlock(&priv->lock);
1334                 spin_unlock_irq(&priv->tx_lock);
1335                 ipoib_cm_tx_destroy(p);
1336                 spin_lock_irq(&priv->tx_lock);
1337                 spin_lock(&priv->lock);
1338         }
1339         spin_unlock(&priv->lock);
1340         spin_unlock_irq(&priv->tx_lock);
1341 }
1342
1343 static void ipoib_cm_skb_reap(struct work_struct *work)
1344 {
1345         struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1346                                                    cm.skb_task);
1347         struct sk_buff *skb;
1348
1349         unsigned mtu = priv->mcast_mtu;
1350
1351         spin_lock_irq(&priv->tx_lock);
1352         spin_lock(&priv->lock);
1353         while ((skb = skb_dequeue(&priv->cm.skb_queue))) {
1354                 spin_unlock(&priv->lock);
1355                 spin_unlock_irq(&priv->tx_lock);
1356                 if (skb->protocol == htons(ETH_P_IP))
1357                         icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu));
1358 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1359                 else if (skb->protocol == htons(ETH_P_IPV6))
1360                         icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, priv->dev);
1361 #endif
1362                 dev_kfree_skb_any(skb);
1363                 spin_lock_irq(&priv->tx_lock);
1364                 spin_lock(&priv->lock);
1365         }
1366         spin_unlock(&priv->lock);
1367         spin_unlock_irq(&priv->tx_lock);
1368 }
1369
1370 void ipoib_cm_skb_too_long(struct net_device *dev, struct sk_buff *skb,
1371                            unsigned int mtu)
1372 {
1373         struct ipoib_dev_priv *priv = netdev_priv(dev);
1374         int e = skb_queue_empty(&priv->cm.skb_queue);
1375
1376         if (skb->dst)
1377                 skb->dst->ops->update_pmtu(skb->dst, mtu);
1378
1379         skb_queue_tail(&priv->cm.skb_queue, skb);
1380         if (e)
1381                 queue_work(ipoib_workqueue, &priv->cm.skb_task);
1382 }
1383
1384 static void ipoib_cm_rx_reap(struct work_struct *work)
1385 {
1386         ipoib_cm_free_rx_reap_list(container_of(work, struct ipoib_dev_priv,
1387                                                 cm.rx_reap_task)->dev);
1388 }
1389
1390 static void ipoib_cm_stale_task(struct work_struct *work)
1391 {
1392         struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1393                                                    cm.stale_task.work);
1394         struct ipoib_cm_rx *p;
1395         int ret;
1396
1397         spin_lock_irq(&priv->lock);
1398         while (!list_empty(&priv->cm.passive_ids)) {
1399                 /* List is sorted by LRU, start from tail,
1400                  * stop when we see a recently used entry */
1401                 p = list_entry(priv->cm.passive_ids.prev, typeof(*p), list);
1402                 if (time_before_eq(jiffies, p->jiffies + IPOIB_CM_RX_TIMEOUT))
1403                         break;
1404                 list_move(&p->list, &priv->cm.rx_error_list);
1405                 p->state = IPOIB_CM_RX_ERROR;
1406                 spin_unlock_irq(&priv->lock);
1407                 ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE);
1408                 if (ret)
1409                         ipoib_warn(priv, "unable to move qp to error state: %d\n", ret);
1410                 spin_lock_irq(&priv->lock);
1411         }
1412
1413         if (!list_empty(&priv->cm.passive_ids))
1414                 queue_delayed_work(ipoib_workqueue,
1415                                    &priv->cm.stale_task, IPOIB_CM_RX_DELAY);
1416         spin_unlock_irq(&priv->lock);
1417 }
1418
1419
1420 static ssize_t show_mode(struct device *d, struct device_attribute *attr,
1421                          char *buf)
1422 {
1423         struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(d));
1424
1425         if (test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags))
1426                 return sprintf(buf, "connected\n");
1427         else
1428                 return sprintf(buf, "datagram\n");
1429 }
1430
1431 static ssize_t set_mode(struct device *d, struct device_attribute *attr,
1432                         const char *buf, size_t count)
1433 {
1434         struct net_device *dev = to_net_dev(d);
1435         struct ipoib_dev_priv *priv = netdev_priv(dev);
1436
1437         /* flush paths if we switch modes so that connections are restarted */
1438         if (IPOIB_CM_SUPPORTED(dev->dev_addr) && !strcmp(buf, "connected\n")) {
1439                 set_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags);
1440                 ipoib_warn(priv, "enabling connected mode "
1441                            "will cause multicast packet drops\n");
1442
1443                 rtnl_lock();
1444                 dev->features &= ~(NETIF_F_IP_CSUM | NETIF_F_SG | NETIF_F_TSO);
1445                 rtnl_unlock();
1446                 priv->tx_wr.send_flags &= ~IB_SEND_IP_CSUM;
1447
1448                 ipoib_flush_paths(dev);
1449                 return count;
1450         }
1451
1452         if (!strcmp(buf, "datagram\n")) {
1453                 clear_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags);
1454
1455                 rtnl_lock();
1456                 if (test_bit(IPOIB_FLAG_CSUM, &priv->flags)) {
1457                         dev->features |= NETIF_F_IP_CSUM | NETIF_F_SG;
1458                         if (priv->hca_caps & IB_DEVICE_UD_TSO)
1459                                 dev->features |= NETIF_F_TSO;
1460                 }
1461                 dev_set_mtu(dev, min(priv->mcast_mtu, dev->mtu));
1462                 rtnl_unlock();
1463                 ipoib_flush_paths(dev);
1464
1465                 return count;
1466         }
1467
1468         return -EINVAL;
1469 }
1470
1471 static DEVICE_ATTR(mode, S_IWUSR | S_IRUGO, show_mode, set_mode);
1472
1473 int ipoib_cm_add_mode_attr(struct net_device *dev)
1474 {
1475         return device_create_file(&dev->dev, &dev_attr_mode);
1476 }
1477
1478 static void ipoib_cm_create_srq(struct net_device *dev, int max_sge)
1479 {
1480         struct ipoib_dev_priv *priv = netdev_priv(dev);
1481         struct ib_srq_init_attr srq_init_attr = {
1482                 .attr = {
1483                         .max_wr  = ipoib_recvq_size,
1484                         .max_sge = max_sge
1485                 }
1486         };
1487
1488         priv->cm.srq = ib_create_srq(priv->pd, &srq_init_attr);
1489         if (IS_ERR(priv->cm.srq)) {
1490                 if (PTR_ERR(priv->cm.srq) != -ENOSYS)
1491                         printk(KERN_WARNING "%s: failed to allocate SRQ, error %ld\n",
1492                                priv->ca->name, PTR_ERR(priv->cm.srq));
1493                 priv->cm.srq = NULL;
1494                 return;
1495         }
1496
1497         priv->cm.srq_ring = kzalloc(ipoib_recvq_size * sizeof *priv->cm.srq_ring,
1498                                     GFP_KERNEL);
1499         if (!priv->cm.srq_ring) {
1500                 printk(KERN_WARNING "%s: failed to allocate CM SRQ ring (%d entries)\n",
1501                        priv->ca->name, ipoib_recvq_size);
1502                 ib_destroy_srq(priv->cm.srq);
1503                 priv->cm.srq = NULL;
1504         }
1505 }
1506
1507 int ipoib_cm_dev_init(struct net_device *dev)
1508 {
1509         struct ipoib_dev_priv *priv = netdev_priv(dev);
1510         int i, ret;
1511         struct ib_device_attr attr;
1512
1513         INIT_LIST_HEAD(&priv->cm.passive_ids);
1514         INIT_LIST_HEAD(&priv->cm.reap_list);
1515         INIT_LIST_HEAD(&priv->cm.start_list);
1516         INIT_LIST_HEAD(&priv->cm.rx_error_list);
1517         INIT_LIST_HEAD(&priv->cm.rx_flush_list);
1518         INIT_LIST_HEAD(&priv->cm.rx_drain_list);
1519         INIT_LIST_HEAD(&priv->cm.rx_reap_list);
1520         INIT_WORK(&priv->cm.start_task, ipoib_cm_tx_start);
1521         INIT_WORK(&priv->cm.reap_task, ipoib_cm_tx_reap);
1522         INIT_WORK(&priv->cm.skb_task, ipoib_cm_skb_reap);
1523         INIT_WORK(&priv->cm.rx_reap_task, ipoib_cm_rx_reap);
1524         INIT_DELAYED_WORK(&priv->cm.stale_task, ipoib_cm_stale_task);
1525
1526         skb_queue_head_init(&priv->cm.skb_queue);
1527
1528         ret = ib_query_device(priv->ca, &attr);
1529         if (ret) {
1530                 printk(KERN_WARNING "ib_query_device() failed with %d\n", ret);
1531                 return ret;
1532         }
1533
1534         ipoib_dbg(priv, "max_srq_sge=%d\n", attr.max_srq_sge);
1535
1536         attr.max_srq_sge = min_t(int, IPOIB_CM_RX_SG, attr.max_srq_sge);
1537         ipoib_cm_create_srq(dev, attr.max_srq_sge);
1538         if (ipoib_cm_has_srq(dev)) {
1539                 priv->cm.max_cm_mtu = attr.max_srq_sge * PAGE_SIZE - 0x10;
1540                 priv->cm.num_frags  = attr.max_srq_sge;
1541                 ipoib_dbg(priv, "max_cm_mtu = 0x%x, num_frags=%d\n",
1542                           priv->cm.max_cm_mtu, priv->cm.num_frags);
1543         } else {
1544                 priv->cm.max_cm_mtu = IPOIB_CM_MTU;
1545                 priv->cm.num_frags  = IPOIB_CM_RX_SG;
1546         }
1547
1548         ipoib_cm_init_rx_wr(dev, &priv->cm.rx_wr, priv->cm.rx_sge);
1549
1550         if (ipoib_cm_has_srq(dev)) {
1551                 for (i = 0; i < ipoib_recvq_size; ++i) {
1552                         if (!ipoib_cm_alloc_rx_skb(dev, priv->cm.srq_ring, i,
1553                                                    priv->cm.num_frags - 1,
1554                                                    priv->cm.srq_ring[i].mapping)) {
1555                                 ipoib_warn(priv, "failed to allocate "
1556                                            "receive buffer %d\n", i);
1557                                 ipoib_cm_dev_cleanup(dev);
1558                                 return -ENOMEM;
1559                         }
1560
1561                         if (ipoib_cm_post_receive_srq(dev, i)) {
1562                                 ipoib_warn(priv, "ipoib_cm_post_receive_srq "
1563                                            "failed for buf %d\n", i);
1564                                 ipoib_cm_dev_cleanup(dev);
1565                                 return -EIO;
1566                         }
1567                 }
1568         }
1569
1570         priv->dev->dev_addr[0] = IPOIB_FLAGS_RC;
1571         return 0;
1572 }
1573
1574 void ipoib_cm_dev_cleanup(struct net_device *dev)
1575 {
1576         struct ipoib_dev_priv *priv = netdev_priv(dev);
1577         int ret;
1578
1579         if (!priv->cm.srq)
1580                 return;
1581
1582         ipoib_dbg(priv, "Cleanup ipoib connected mode.\n");
1583
1584         ret = ib_destroy_srq(priv->cm.srq);
1585         if (ret)
1586                 ipoib_warn(priv, "ib_destroy_srq failed: %d\n", ret);
1587
1588         priv->cm.srq = NULL;
1589         if (!priv->cm.srq_ring)
1590                 return;
1591
1592         ipoib_cm_free_rx_ring(dev, priv->cm.srq_ring);
1593         priv->cm.srq_ring = NULL;
1594 }