2 * Copyright (c) 2006 Mellanox Technologies. All rights reserved
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:
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
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.
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
33 #include <rdma/ib_cm.h>
36 #include <linux/icmpv6.h>
37 #include <linux/delay.h>
38 #include <linux/slab.h>
39 #include <linux/vmalloc.h>
40 #include <linux/moduleparam.h>
44 int ipoib_max_conn_qp = 128;
46 module_param_named(max_nonsrq_conn_qp, ipoib_max_conn_qp, int, 0444);
47 MODULE_PARM_DESC(max_nonsrq_conn_qp,
48 "Max number of connected-mode QPs per interface "
49 "(applied only if shared receive queue is not available)");
51 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG_DATA
52 static int data_debug_level;
54 module_param_named(cm_data_debug_level, data_debug_level, int, 0644);
55 MODULE_PARM_DESC(cm_data_debug_level,
56 "Enable data path debug tracing for connected mode if > 0");
59 #define IPOIB_CM_IETF_ID 0x1000000000000000ULL
61 #define IPOIB_CM_RX_UPDATE_TIME (256 * HZ)
62 #define IPOIB_CM_RX_TIMEOUT (2 * 256 * HZ)
63 #define IPOIB_CM_RX_DELAY (3 * 256 * HZ)
64 #define IPOIB_CM_RX_UPDATE_MASK (0x3)
66 static struct ib_qp_attr ipoib_cm_err_attr = {
67 .qp_state = IB_QPS_ERR
70 #define IPOIB_CM_RX_DRAIN_WRID 0xffffffff
72 static struct ib_send_wr ipoib_cm_rx_drain_wr = {
73 .wr_id = IPOIB_CM_RX_DRAIN_WRID,
77 static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id,
78 struct ib_cm_event *event);
80 static void ipoib_cm_dma_unmap_rx(struct ipoib_dev_priv *priv, int frags,
81 u64 mapping[IPOIB_CM_RX_SG])
85 ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_CM_HEAD_SIZE, DMA_FROM_DEVICE);
87 for (i = 0; i < frags; ++i)
88 ib_dma_unmap_page(priv->ca, mapping[i + 1], PAGE_SIZE, DMA_FROM_DEVICE);
91 static int ipoib_cm_post_receive_srq(struct net_device *dev, int id)
93 struct ipoib_dev_priv *priv = netdev_priv(dev);
94 struct ib_recv_wr *bad_wr;
97 priv->cm.rx_wr.wr_id = id | IPOIB_OP_CM | IPOIB_OP_RECV;
99 for (i = 0; i < priv->cm.num_frags; ++i)
100 priv->cm.rx_sge[i].addr = priv->cm.srq_ring[id].mapping[i];
102 ret = ib_post_srq_recv(priv->cm.srq, &priv->cm.rx_wr, &bad_wr);
104 ipoib_warn(priv, "post srq failed for buf %d (%d)\n", id, ret);
105 ipoib_cm_dma_unmap_rx(priv, priv->cm.num_frags - 1,
106 priv->cm.srq_ring[id].mapping);
107 dev_kfree_skb_any(priv->cm.srq_ring[id].skb);
108 priv->cm.srq_ring[id].skb = NULL;
114 static int ipoib_cm_post_receive_nonsrq(struct net_device *dev,
115 struct ipoib_cm_rx *rx,
116 struct ib_recv_wr *wr,
117 struct ib_sge *sge, int id)
119 struct ipoib_dev_priv *priv = netdev_priv(dev);
120 struct ib_recv_wr *bad_wr;
123 wr->wr_id = id | IPOIB_OP_CM | IPOIB_OP_RECV;
125 for (i = 0; i < IPOIB_CM_RX_SG; ++i)
126 sge[i].addr = rx->rx_ring[id].mapping[i];
128 ret = ib_post_recv(rx->qp, wr, &bad_wr);
130 ipoib_warn(priv, "post recv failed for buf %d (%d)\n", id, ret);
131 ipoib_cm_dma_unmap_rx(priv, IPOIB_CM_RX_SG - 1,
132 rx->rx_ring[id].mapping);
133 dev_kfree_skb_any(rx->rx_ring[id].skb);
134 rx->rx_ring[id].skb = NULL;
140 static struct sk_buff *ipoib_cm_alloc_rx_skb(struct net_device *dev,
141 struct ipoib_cm_rx_buf *rx_ring,
143 u64 mapping[IPOIB_CM_RX_SG],
146 struct ipoib_dev_priv *priv = netdev_priv(dev);
150 skb = dev_alloc_skb(IPOIB_CM_HEAD_SIZE + 12);
155 * IPoIB adds a 4 byte header. So we need 12 more bytes to align the
156 * IP header to a multiple of 16.
158 skb_reserve(skb, 12);
160 mapping[0] = ib_dma_map_single(priv->ca, skb->data, IPOIB_CM_HEAD_SIZE,
162 if (unlikely(ib_dma_mapping_error(priv->ca, mapping[0]))) {
163 dev_kfree_skb_any(skb);
167 for (i = 0; i < frags; i++) {
168 struct page *page = alloc_page(gfp);
172 skb_fill_page_desc(skb, i, page, 0, PAGE_SIZE);
174 mapping[i + 1] = ib_dma_map_page(priv->ca, page,
175 0, PAGE_SIZE, DMA_FROM_DEVICE);
176 if (unlikely(ib_dma_mapping_error(priv->ca, mapping[i + 1])))
180 rx_ring[id].skb = skb;
185 ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_CM_HEAD_SIZE, DMA_FROM_DEVICE);
188 ib_dma_unmap_page(priv->ca, mapping[i], PAGE_SIZE, DMA_FROM_DEVICE);
190 dev_kfree_skb_any(skb);
194 static void ipoib_cm_free_rx_ring(struct net_device *dev,
195 struct ipoib_cm_rx_buf *rx_ring)
197 struct ipoib_dev_priv *priv = netdev_priv(dev);
200 for (i = 0; i < ipoib_recvq_size; ++i)
201 if (rx_ring[i].skb) {
202 ipoib_cm_dma_unmap_rx(priv, IPOIB_CM_RX_SG - 1,
204 dev_kfree_skb_any(rx_ring[i].skb);
210 static void ipoib_cm_start_rx_drain(struct ipoib_dev_priv *priv)
212 struct ib_send_wr *bad_wr;
213 struct ipoib_cm_rx *p;
215 /* We only reserved 1 extra slot in CQ for drain WRs, so
216 * make sure we have at most 1 outstanding WR. */
217 if (list_empty(&priv->cm.rx_flush_list) ||
218 !list_empty(&priv->cm.rx_drain_list))
222 * QPs on flush list are error state. This way, a "flush
223 * error" WC will be immediately generated for each WR we post.
225 p = list_entry(priv->cm.rx_flush_list.next, typeof(*p), list);
226 if (ib_post_send(p->qp, &ipoib_cm_rx_drain_wr, &bad_wr))
227 ipoib_warn(priv, "failed to post drain wr\n");
229 list_splice_init(&priv->cm.rx_flush_list, &priv->cm.rx_drain_list);
232 static void ipoib_cm_rx_event_handler(struct ib_event *event, void *ctx)
234 struct ipoib_cm_rx *p = ctx;
235 struct ipoib_dev_priv *priv = netdev_priv(p->dev);
238 if (event->event != IB_EVENT_QP_LAST_WQE_REACHED)
241 spin_lock_irqsave(&priv->lock, flags);
242 list_move(&p->list, &priv->cm.rx_flush_list);
243 p->state = IPOIB_CM_RX_FLUSH;
244 ipoib_cm_start_rx_drain(priv);
245 spin_unlock_irqrestore(&priv->lock, flags);
248 static struct ib_qp *ipoib_cm_create_rx_qp(struct net_device *dev,
249 struct ipoib_cm_rx *p)
251 struct ipoib_dev_priv *priv = netdev_priv(dev);
252 struct ib_qp_init_attr attr = {
253 .event_handler = ipoib_cm_rx_event_handler,
254 .send_cq = priv->recv_cq, /* For drain WR */
255 .recv_cq = priv->recv_cq,
257 .cap.max_send_wr = 1, /* For drain WR */
258 .cap.max_send_sge = 1, /* FIXME: 0 Seems not to work */
259 .sq_sig_type = IB_SIGNAL_ALL_WR,
260 .qp_type = IB_QPT_RC,
264 if (!ipoib_cm_has_srq(dev)) {
265 attr.cap.max_recv_wr = ipoib_recvq_size;
266 attr.cap.max_recv_sge = IPOIB_CM_RX_SG;
269 return ib_create_qp(priv->pd, &attr);
272 static int ipoib_cm_modify_rx_qp(struct net_device *dev,
273 struct ib_cm_id *cm_id, struct ib_qp *qp,
276 struct ipoib_dev_priv *priv = netdev_priv(dev);
277 struct ib_qp_attr qp_attr;
278 int qp_attr_mask, ret;
280 qp_attr.qp_state = IB_QPS_INIT;
281 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
283 ipoib_warn(priv, "failed to init QP attr for INIT: %d\n", ret);
286 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
288 ipoib_warn(priv, "failed to modify QP to INIT: %d\n", ret);
291 qp_attr.qp_state = IB_QPS_RTR;
292 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
294 ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret);
297 qp_attr.rq_psn = psn;
298 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
300 ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret);
305 * Current Mellanox HCA firmware won't generate completions
306 * with error for drain WRs unless the QP has been moved to
307 * RTS first. This work-around leaves a window where a QP has
308 * moved to error asynchronously, but this will eventually get
309 * fixed in firmware, so let's not error out if modify QP
312 qp_attr.qp_state = IB_QPS_RTS;
313 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
315 ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret);
318 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
320 ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret);
327 static void ipoib_cm_init_rx_wr(struct net_device *dev,
328 struct ib_recv_wr *wr,
331 struct ipoib_dev_priv *priv = netdev_priv(dev);
334 for (i = 0; i < priv->cm.num_frags; ++i)
335 sge[i].lkey = priv->mr->lkey;
337 sge[0].length = IPOIB_CM_HEAD_SIZE;
338 for (i = 1; i < priv->cm.num_frags; ++i)
339 sge[i].length = PAGE_SIZE;
343 wr->num_sge = priv->cm.num_frags;
346 static int ipoib_cm_nonsrq_init_rx(struct net_device *dev, struct ib_cm_id *cm_id,
347 struct ipoib_cm_rx *rx)
349 struct ipoib_dev_priv *priv = netdev_priv(dev);
351 struct ib_recv_wr wr;
352 struct ib_sge sge[IPOIB_CM_RX_SG];
357 rx->rx_ring = vzalloc(ipoib_recvq_size * sizeof *rx->rx_ring);
359 printk(KERN_WARNING "%s: failed to allocate CM non-SRQ ring (%d entries)\n",
360 priv->ca->name, ipoib_recvq_size);
364 t = kmalloc(sizeof *t, GFP_KERNEL);
370 ipoib_cm_init_rx_wr(dev, &t->wr, t->sge);
372 spin_lock_irq(&priv->lock);
374 if (priv->cm.nonsrq_conn_qp >= ipoib_max_conn_qp) {
375 spin_unlock_irq(&priv->lock);
376 ib_send_cm_rej(cm_id, IB_CM_REJ_NO_QP, NULL, 0, NULL, 0);
380 ++priv->cm.nonsrq_conn_qp;
382 spin_unlock_irq(&priv->lock);
384 for (i = 0; i < ipoib_recvq_size; ++i) {
385 if (!ipoib_cm_alloc_rx_skb(dev, rx->rx_ring, i, IPOIB_CM_RX_SG - 1,
386 rx->rx_ring[i].mapping,
388 ipoib_warn(priv, "failed to allocate receive buffer %d\n", i);
392 ret = ipoib_cm_post_receive_nonsrq(dev, rx, &t->wr, t->sge, i);
394 ipoib_warn(priv, "ipoib_cm_post_receive_nonsrq "
395 "failed for buf %d\n", i);
401 rx->recv_count = ipoib_recvq_size;
408 spin_lock_irq(&priv->lock);
409 --priv->cm.nonsrq_conn_qp;
410 spin_unlock_irq(&priv->lock);
414 ipoib_cm_free_rx_ring(dev, rx->rx_ring);
419 static int ipoib_cm_send_rep(struct net_device *dev, struct ib_cm_id *cm_id,
420 struct ib_qp *qp, struct ib_cm_req_event_param *req,
423 struct ipoib_dev_priv *priv = netdev_priv(dev);
424 struct ipoib_cm_data data = {};
425 struct ib_cm_rep_param rep = {};
427 data.qpn = cpu_to_be32(priv->qp->qp_num);
428 data.mtu = cpu_to_be32(IPOIB_CM_BUF_SIZE);
430 rep.private_data = &data;
431 rep.private_data_len = sizeof data;
432 rep.flow_control = 0;
433 rep.rnr_retry_count = req->rnr_retry_count;
434 rep.srq = ipoib_cm_has_srq(dev);
435 rep.qp_num = qp->qp_num;
436 rep.starting_psn = psn;
437 return ib_send_cm_rep(cm_id, &rep);
440 static int ipoib_cm_req_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
442 struct net_device *dev = cm_id->context;
443 struct ipoib_dev_priv *priv = netdev_priv(dev);
444 struct ipoib_cm_rx *p;
448 ipoib_dbg(priv, "REQ arrived\n");
449 p = kzalloc(sizeof *p, GFP_KERNEL);
455 p->state = IPOIB_CM_RX_LIVE;
456 p->jiffies = jiffies;
457 INIT_LIST_HEAD(&p->list);
459 p->qp = ipoib_cm_create_rx_qp(dev, p);
461 ret = PTR_ERR(p->qp);
465 psn = prandom_u32() & 0xffffff;
466 ret = ipoib_cm_modify_rx_qp(dev, cm_id, p->qp, psn);
470 if (!ipoib_cm_has_srq(dev)) {
471 ret = ipoib_cm_nonsrq_init_rx(dev, cm_id, p);
476 spin_lock_irq(&priv->lock);
477 queue_delayed_work(ipoib_workqueue,
478 &priv->cm.stale_task, IPOIB_CM_RX_DELAY);
479 /* Add this entry to passive ids list head, but do not re-add it
480 * if IB_EVENT_QP_LAST_WQE_REACHED has moved it to flush list. */
481 p->jiffies = jiffies;
482 if (p->state == IPOIB_CM_RX_LIVE)
483 list_move(&p->list, &priv->cm.passive_ids);
484 spin_unlock_irq(&priv->lock);
486 ret = ipoib_cm_send_rep(dev, cm_id, p->qp, &event->param.req_rcvd, psn);
488 ipoib_warn(priv, "failed to send REP: %d\n", ret);
489 if (ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE))
490 ipoib_warn(priv, "unable to move qp to error state\n");
495 ib_destroy_qp(p->qp);
501 static int ipoib_cm_rx_handler(struct ib_cm_id *cm_id,
502 struct ib_cm_event *event)
504 struct ipoib_cm_rx *p;
505 struct ipoib_dev_priv *priv;
507 switch (event->event) {
508 case IB_CM_REQ_RECEIVED:
509 return ipoib_cm_req_handler(cm_id, event);
510 case IB_CM_DREQ_RECEIVED:
512 ib_send_cm_drep(cm_id, NULL, 0);
514 case IB_CM_REJ_RECEIVED:
516 priv = netdev_priv(p->dev);
517 if (ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE))
518 ipoib_warn(priv, "unable to move qp to error state\n");
524 /* Adjust length of skb with fragments to match received data */
525 static void skb_put_frags(struct sk_buff *skb, unsigned int hdr_space,
526 unsigned int length, struct sk_buff *toskb)
531 /* put header into skb */
532 size = min(length, hdr_space);
537 num_frags = skb_shinfo(skb)->nr_frags;
538 for (i = 0; i < num_frags; i++) {
539 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
542 /* don't need this page */
543 skb_fill_page_desc(toskb, i, skb_frag_page(frag),
545 --skb_shinfo(skb)->nr_frags;
547 size = min(length, (unsigned) PAGE_SIZE);
549 skb_frag_size_set(frag, size);
550 skb->data_len += size;
551 skb->truesize += size;
558 void ipoib_cm_handle_rx_wc(struct net_device *dev, struct ib_wc *wc)
560 struct ipoib_dev_priv *priv = netdev_priv(dev);
561 struct ipoib_cm_rx_buf *rx_ring;
562 unsigned int wr_id = wc->wr_id & ~(IPOIB_OP_CM | IPOIB_OP_RECV);
563 struct sk_buff *skb, *newskb;
564 struct ipoib_cm_rx *p;
566 u64 mapping[IPOIB_CM_RX_SG];
569 struct sk_buff *small_skb;
571 ipoib_dbg_data(priv, "cm recv completion: id %d, status: %d\n",
574 if (unlikely(wr_id >= ipoib_recvq_size)) {
575 if (wr_id == (IPOIB_CM_RX_DRAIN_WRID & ~(IPOIB_OP_CM | IPOIB_OP_RECV))) {
576 spin_lock_irqsave(&priv->lock, flags);
577 list_splice_init(&priv->cm.rx_drain_list, &priv->cm.rx_reap_list);
578 ipoib_cm_start_rx_drain(priv);
579 queue_work(ipoib_workqueue, &priv->cm.rx_reap_task);
580 spin_unlock_irqrestore(&priv->lock, flags);
582 ipoib_warn(priv, "cm recv completion event with wrid %d (> %d)\n",
583 wr_id, ipoib_recvq_size);
587 p = wc->qp->qp_context;
589 has_srq = ipoib_cm_has_srq(dev);
590 rx_ring = has_srq ? priv->cm.srq_ring : p->rx_ring;
592 skb = rx_ring[wr_id].skb;
594 if (unlikely(wc->status != IB_WC_SUCCESS)) {
595 ipoib_dbg(priv, "cm recv error "
596 "(status=%d, wrid=%d vend_err %x)\n",
597 wc->status, wr_id, wc->vendor_err);
598 ++dev->stats.rx_dropped;
602 if (!--p->recv_count) {
603 spin_lock_irqsave(&priv->lock, flags);
604 list_move(&p->list, &priv->cm.rx_reap_list);
605 spin_unlock_irqrestore(&priv->lock, flags);
606 queue_work(ipoib_workqueue, &priv->cm.rx_reap_task);
612 if (unlikely(!(wr_id & IPOIB_CM_RX_UPDATE_MASK))) {
613 if (p && time_after_eq(jiffies, p->jiffies + IPOIB_CM_RX_UPDATE_TIME)) {
614 spin_lock_irqsave(&priv->lock, flags);
615 p->jiffies = jiffies;
616 /* Move this entry to list head, but do not re-add it
617 * if it has been moved out of list. */
618 if (p->state == IPOIB_CM_RX_LIVE)
619 list_move(&p->list, &priv->cm.passive_ids);
620 spin_unlock_irqrestore(&priv->lock, flags);
624 if (wc->byte_len < IPOIB_CM_COPYBREAK) {
625 int dlen = wc->byte_len;
627 small_skb = dev_alloc_skb(dlen + 12);
629 skb_reserve(small_skb, 12);
630 ib_dma_sync_single_for_cpu(priv->ca, rx_ring[wr_id].mapping[0],
631 dlen, DMA_FROM_DEVICE);
632 skb_copy_from_linear_data(skb, small_skb->data, dlen);
633 ib_dma_sync_single_for_device(priv->ca, rx_ring[wr_id].mapping[0],
634 dlen, DMA_FROM_DEVICE);
635 skb_put(small_skb, dlen);
641 frags = PAGE_ALIGN(wc->byte_len - min(wc->byte_len,
642 (unsigned)IPOIB_CM_HEAD_SIZE)) / PAGE_SIZE;
644 newskb = ipoib_cm_alloc_rx_skb(dev, rx_ring, wr_id, frags,
645 mapping, GFP_ATOMIC);
646 if (unlikely(!newskb)) {
648 * If we can't allocate a new RX buffer, dump
649 * this packet and reuse the old buffer.
651 ipoib_dbg(priv, "failed to allocate receive buffer %d\n", wr_id);
652 ++dev->stats.rx_dropped;
656 ipoib_cm_dma_unmap_rx(priv, frags, rx_ring[wr_id].mapping);
657 memcpy(rx_ring[wr_id].mapping, mapping, (frags + 1) * sizeof *mapping);
659 ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n",
660 wc->byte_len, wc->slid);
662 skb_put_frags(skb, IPOIB_CM_HEAD_SIZE, wc->byte_len, newskb);
665 skb->protocol = ((struct ipoib_header *) skb->data)->proto;
666 skb_reset_mac_header(skb);
667 skb_pull(skb, IPOIB_ENCAP_LEN);
669 ++dev->stats.rx_packets;
670 dev->stats.rx_bytes += skb->len;
673 /* XXX get correct PACKET_ type here */
674 skb->pkt_type = PACKET_HOST;
675 netif_receive_skb(skb);
679 if (unlikely(ipoib_cm_post_receive_srq(dev, wr_id)))
680 ipoib_warn(priv, "ipoib_cm_post_receive_srq failed "
681 "for buf %d\n", wr_id);
683 if (unlikely(ipoib_cm_post_receive_nonsrq(dev, p,
688 ipoib_warn(priv, "ipoib_cm_post_receive_nonsrq failed "
689 "for buf %d\n", wr_id);
694 static inline int post_send(struct ipoib_dev_priv *priv,
695 struct ipoib_cm_tx *tx,
699 struct ib_send_wr *bad_wr;
701 priv->tx_sge[0].addr = addr;
702 priv->tx_sge[0].length = len;
704 priv->tx_wr.num_sge = 1;
705 priv->tx_wr.wr_id = wr_id | IPOIB_OP_CM;
707 return ib_post_send(tx->qp, &priv->tx_wr, &bad_wr);
710 void ipoib_cm_send(struct net_device *dev, struct sk_buff *skb, struct ipoib_cm_tx *tx)
712 struct ipoib_dev_priv *priv = netdev_priv(dev);
713 struct ipoib_cm_tx_buf *tx_req;
717 if (unlikely(skb->len > tx->mtu)) {
718 ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n",
720 ++dev->stats.tx_dropped;
721 ++dev->stats.tx_errors;
722 ipoib_cm_skb_too_long(dev, skb, tx->mtu - IPOIB_ENCAP_LEN);
726 ipoib_dbg_data(priv, "sending packet: head 0x%x length %d connection 0x%x\n",
727 tx->tx_head, skb->len, tx->qp->qp_num);
730 * We put the skb into the tx_ring _before_ we call post_send()
731 * because it's entirely possible that the completion handler will
732 * run before we execute anything after the post_send(). That
733 * means we have to make sure everything is properly recorded and
734 * our state is consistent before we call post_send().
736 tx_req = &tx->tx_ring[tx->tx_head & (ipoib_sendq_size - 1)];
738 addr = ib_dma_map_single(priv->ca, skb->data, skb->len, DMA_TO_DEVICE);
739 if (unlikely(ib_dma_mapping_error(priv->ca, addr))) {
740 ++dev->stats.tx_errors;
741 dev_kfree_skb_any(skb);
745 tx_req->mapping = addr;
750 rc = post_send(priv, tx, tx->tx_head & (ipoib_sendq_size - 1),
753 ipoib_warn(priv, "post_send failed, error %d\n", rc);
754 ++dev->stats.tx_errors;
755 ib_dma_unmap_single(priv->ca, addr, skb->len, DMA_TO_DEVICE);
756 dev_kfree_skb_any(skb);
758 dev->trans_start = jiffies;
761 if (++priv->tx_outstanding == ipoib_sendq_size) {
762 ipoib_dbg(priv, "TX ring 0x%x full, stopping kernel net queue\n",
764 netif_stop_queue(dev);
765 rc = ib_req_notify_cq(priv->send_cq,
766 IB_CQ_NEXT_COMP | IB_CQ_REPORT_MISSED_EVENTS);
768 ipoib_warn(priv, "request notify on send CQ failed\n");
770 ipoib_send_comp_handler(priv->send_cq, dev);
775 void ipoib_cm_handle_tx_wc(struct net_device *dev, struct ib_wc *wc)
777 struct ipoib_dev_priv *priv = netdev_priv(dev);
778 struct ipoib_cm_tx *tx = wc->qp->qp_context;
779 unsigned int wr_id = wc->wr_id & ~IPOIB_OP_CM;
780 struct ipoib_cm_tx_buf *tx_req;
783 ipoib_dbg_data(priv, "cm send completion: id %d, status: %d\n",
786 if (unlikely(wr_id >= ipoib_sendq_size)) {
787 ipoib_warn(priv, "cm send completion event with wrid %d (> %d)\n",
788 wr_id, ipoib_sendq_size);
792 tx_req = &tx->tx_ring[wr_id];
794 ib_dma_unmap_single(priv->ca, tx_req->mapping, tx_req->skb->len, DMA_TO_DEVICE);
796 /* FIXME: is this right? Shouldn't we only increment on success? */
797 ++dev->stats.tx_packets;
798 dev->stats.tx_bytes += tx_req->skb->len;
800 dev_kfree_skb_any(tx_req->skb);
805 if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) &&
806 netif_queue_stopped(dev) &&
807 test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
808 netif_wake_queue(dev);
810 if (wc->status != IB_WC_SUCCESS &&
811 wc->status != IB_WC_WR_FLUSH_ERR) {
812 struct ipoib_neigh *neigh;
814 ipoib_dbg(priv, "failed cm send event "
815 "(status=%d, wrid=%d vend_err %x)\n",
816 wc->status, wr_id, wc->vendor_err);
818 spin_lock_irqsave(&priv->lock, flags);
823 ipoib_neigh_free(neigh);
828 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
829 list_move(&tx->list, &priv->cm.reap_list);
830 queue_work(ipoib_workqueue, &priv->cm.reap_task);
833 clear_bit(IPOIB_FLAG_OPER_UP, &tx->flags);
835 spin_unlock_irqrestore(&priv->lock, flags);
838 netif_tx_unlock(dev);
841 int ipoib_cm_dev_open(struct net_device *dev)
843 struct ipoib_dev_priv *priv = netdev_priv(dev);
846 if (!IPOIB_CM_SUPPORTED(dev->dev_addr))
849 priv->cm.id = ib_create_cm_id(priv->ca, ipoib_cm_rx_handler, dev);
850 if (IS_ERR(priv->cm.id)) {
851 printk(KERN_WARNING "%s: failed to create CM ID\n", priv->ca->name);
852 ret = PTR_ERR(priv->cm.id);
856 ret = ib_cm_listen(priv->cm.id, cpu_to_be64(IPOIB_CM_IETF_ID | priv->qp->qp_num),
859 printk(KERN_WARNING "%s: failed to listen on ID 0x%llx\n", priv->ca->name,
860 IPOIB_CM_IETF_ID | priv->qp->qp_num);
867 ib_destroy_cm_id(priv->cm.id);
873 static void ipoib_cm_free_rx_reap_list(struct net_device *dev)
875 struct ipoib_dev_priv *priv = netdev_priv(dev);
876 struct ipoib_cm_rx *rx, *n;
879 spin_lock_irq(&priv->lock);
880 list_splice_init(&priv->cm.rx_reap_list, &list);
881 spin_unlock_irq(&priv->lock);
883 list_for_each_entry_safe(rx, n, &list, list) {
884 ib_destroy_cm_id(rx->id);
885 ib_destroy_qp(rx->qp);
886 if (!ipoib_cm_has_srq(dev)) {
887 ipoib_cm_free_rx_ring(priv->dev, rx->rx_ring);
888 spin_lock_irq(&priv->lock);
889 --priv->cm.nonsrq_conn_qp;
890 spin_unlock_irq(&priv->lock);
896 void ipoib_cm_dev_stop(struct net_device *dev)
898 struct ipoib_dev_priv *priv = netdev_priv(dev);
899 struct ipoib_cm_rx *p;
903 if (!IPOIB_CM_SUPPORTED(dev->dev_addr) || !priv->cm.id)
906 ib_destroy_cm_id(priv->cm.id);
909 spin_lock_irq(&priv->lock);
910 while (!list_empty(&priv->cm.passive_ids)) {
911 p = list_entry(priv->cm.passive_ids.next, typeof(*p), list);
912 list_move(&p->list, &priv->cm.rx_error_list);
913 p->state = IPOIB_CM_RX_ERROR;
914 spin_unlock_irq(&priv->lock);
915 ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE);
917 ipoib_warn(priv, "unable to move qp to error state: %d\n", ret);
918 spin_lock_irq(&priv->lock);
921 /* Wait for all RX to be drained */
924 while (!list_empty(&priv->cm.rx_error_list) ||
925 !list_empty(&priv->cm.rx_flush_list) ||
926 !list_empty(&priv->cm.rx_drain_list)) {
927 if (time_after(jiffies, begin + 5 * HZ)) {
928 ipoib_warn(priv, "RX drain timing out\n");
931 * assume the HW is wedged and just free up everything.
933 list_splice_init(&priv->cm.rx_flush_list,
934 &priv->cm.rx_reap_list);
935 list_splice_init(&priv->cm.rx_error_list,
936 &priv->cm.rx_reap_list);
937 list_splice_init(&priv->cm.rx_drain_list,
938 &priv->cm.rx_reap_list);
941 spin_unlock_irq(&priv->lock);
944 spin_lock_irq(&priv->lock);
947 spin_unlock_irq(&priv->lock);
949 ipoib_cm_free_rx_reap_list(dev);
951 cancel_delayed_work(&priv->cm.stale_task);
954 static int ipoib_cm_rep_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
956 struct ipoib_cm_tx *p = cm_id->context;
957 struct ipoib_dev_priv *priv = netdev_priv(p->dev);
958 struct ipoib_cm_data *data = event->private_data;
959 struct sk_buff_head skqueue;
960 struct ib_qp_attr qp_attr;
961 int qp_attr_mask, ret;
964 p->mtu = be32_to_cpu(data->mtu);
966 if (p->mtu <= IPOIB_ENCAP_LEN) {
967 ipoib_warn(priv, "Rejecting connection: mtu %d <= %d\n",
968 p->mtu, IPOIB_ENCAP_LEN);
972 qp_attr.qp_state = IB_QPS_RTR;
973 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
975 ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret);
979 qp_attr.rq_psn = 0 /* FIXME */;
980 ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask);
982 ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret);
986 qp_attr.qp_state = IB_QPS_RTS;
987 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
989 ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret);
992 ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask);
994 ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret);
998 skb_queue_head_init(&skqueue);
1000 spin_lock_irq(&priv->lock);
1001 set_bit(IPOIB_FLAG_OPER_UP, &p->flags);
1003 while ((skb = __skb_dequeue(&p->neigh->queue)))
1004 __skb_queue_tail(&skqueue, skb);
1005 spin_unlock_irq(&priv->lock);
1007 while ((skb = __skb_dequeue(&skqueue))) {
1009 if (dev_queue_xmit(skb))
1010 ipoib_warn(priv, "dev_queue_xmit failed "
1011 "to requeue packet\n");
1014 ret = ib_send_cm_rtu(cm_id, NULL, 0);
1016 ipoib_warn(priv, "failed to send RTU: %d\n", ret);
1022 static struct ib_qp *ipoib_cm_create_tx_qp(struct net_device *dev, struct ipoib_cm_tx *tx)
1024 struct ipoib_dev_priv *priv = netdev_priv(dev);
1025 struct ib_qp_init_attr attr = {
1026 .send_cq = priv->recv_cq,
1027 .recv_cq = priv->recv_cq,
1028 .srq = priv->cm.srq,
1029 .cap.max_send_wr = ipoib_sendq_size,
1030 .cap.max_send_sge = 1,
1031 .sq_sig_type = IB_SIGNAL_ALL_WR,
1032 .qp_type = IB_QPT_RC,
1034 .create_flags = IB_QP_CREATE_USE_GFP_NOIO
1037 struct ib_qp *tx_qp;
1039 tx_qp = ib_create_qp(priv->pd, &attr);
1040 if (PTR_ERR(tx_qp) == -EINVAL) {
1041 ipoib_warn(priv, "can't use GFP_NOIO for QPs on device %s, using GFP_KERNEL\n",
1043 attr.create_flags &= ~IB_QP_CREATE_USE_GFP_NOIO;
1044 tx_qp = ib_create_qp(priv->pd, &attr);
1049 static int ipoib_cm_send_req(struct net_device *dev,
1050 struct ib_cm_id *id, struct ib_qp *qp,
1052 struct ib_sa_path_rec *pathrec)
1054 struct ipoib_dev_priv *priv = netdev_priv(dev);
1055 struct ipoib_cm_data data = {};
1056 struct ib_cm_req_param req = {};
1058 data.qpn = cpu_to_be32(priv->qp->qp_num);
1059 data.mtu = cpu_to_be32(IPOIB_CM_BUF_SIZE);
1061 req.primary_path = pathrec;
1062 req.alternate_path = NULL;
1063 req.service_id = cpu_to_be64(IPOIB_CM_IETF_ID | qpn);
1064 req.qp_num = qp->qp_num;
1065 req.qp_type = qp->qp_type;
1066 req.private_data = &data;
1067 req.private_data_len = sizeof data;
1068 req.flow_control = 0;
1070 req.starting_psn = 0; /* FIXME */
1073 * Pick some arbitrary defaults here; we could make these
1074 * module parameters if anyone cared about setting them.
1076 req.responder_resources = 4;
1077 req.remote_cm_response_timeout = 20;
1078 req.local_cm_response_timeout = 20;
1079 req.retry_count = 0; /* RFC draft warns against retries */
1080 req.rnr_retry_count = 0; /* RFC draft warns against retries */
1081 req.max_cm_retries = 15;
1082 req.srq = ipoib_cm_has_srq(dev);
1083 return ib_send_cm_req(id, &req);
1086 static int ipoib_cm_modify_tx_init(struct net_device *dev,
1087 struct ib_cm_id *cm_id, struct ib_qp *qp)
1089 struct ipoib_dev_priv *priv = netdev_priv(dev);
1090 struct ib_qp_attr qp_attr;
1091 int qp_attr_mask, ret;
1092 ret = ib_find_pkey(priv->ca, priv->port, priv->pkey, &qp_attr.pkey_index);
1094 ipoib_warn(priv, "pkey 0x%x not found: %d\n", priv->pkey, ret);
1098 qp_attr.qp_state = IB_QPS_INIT;
1099 qp_attr.qp_access_flags = IB_ACCESS_LOCAL_WRITE;
1100 qp_attr.port_num = priv->port;
1101 qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS | IB_QP_PKEY_INDEX | IB_QP_PORT;
1103 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
1105 ipoib_warn(priv, "failed to modify tx QP to INIT: %d\n", ret);
1111 static int ipoib_cm_tx_init(struct ipoib_cm_tx *p, u32 qpn,
1112 struct ib_sa_path_rec *pathrec)
1114 struct ipoib_dev_priv *priv = netdev_priv(p->dev);
1117 p->tx_ring = __vmalloc(ipoib_sendq_size * sizeof *p->tx_ring,
1118 GFP_NOIO, PAGE_KERNEL);
1120 ipoib_warn(priv, "failed to allocate tx ring\n");
1124 memset(p->tx_ring, 0, ipoib_sendq_size * sizeof *p->tx_ring);
1126 p->qp = ipoib_cm_create_tx_qp(p->dev, p);
1127 if (IS_ERR(p->qp)) {
1128 ret = PTR_ERR(p->qp);
1129 ipoib_warn(priv, "failed to allocate tx qp: %d\n", ret);
1133 p->id = ib_create_cm_id(priv->ca, ipoib_cm_tx_handler, p);
1134 if (IS_ERR(p->id)) {
1135 ret = PTR_ERR(p->id);
1136 ipoib_warn(priv, "failed to create tx cm id: %d\n", ret);
1140 ret = ipoib_cm_modify_tx_init(p->dev, p->id, p->qp);
1142 ipoib_warn(priv, "failed to modify tx qp to rtr: %d\n", ret);
1146 ret = ipoib_cm_send_req(p->dev, p->id, p->qp, qpn, pathrec);
1148 ipoib_warn(priv, "failed to send cm req: %d\n", ret);
1152 ipoib_dbg(priv, "Request connection 0x%x for gid %pI6 qpn 0x%x\n",
1153 p->qp->qp_num, pathrec->dgid.raw, qpn);
1159 ib_destroy_cm_id(p->id);
1162 ib_destroy_qp(p->qp);
1170 static void ipoib_cm_tx_destroy(struct ipoib_cm_tx *p)
1172 struct ipoib_dev_priv *priv = netdev_priv(p->dev);
1173 struct ipoib_cm_tx_buf *tx_req;
1174 unsigned long begin;
1176 ipoib_dbg(priv, "Destroy active connection 0x%x head 0x%x tail 0x%x\n",
1177 p->qp ? p->qp->qp_num : 0, p->tx_head, p->tx_tail);
1180 ib_destroy_cm_id(p->id);
1183 /* Wait for all sends to complete */
1185 while ((int) p->tx_tail - (int) p->tx_head < 0) {
1186 if (time_after(jiffies, begin + 5 * HZ)) {
1187 ipoib_warn(priv, "timing out; %d sends not completed\n",
1188 p->tx_head - p->tx_tail);
1198 while ((int) p->tx_tail - (int) p->tx_head < 0) {
1199 tx_req = &p->tx_ring[p->tx_tail & (ipoib_sendq_size - 1)];
1200 ib_dma_unmap_single(priv->ca, tx_req->mapping, tx_req->skb->len,
1202 dev_kfree_skb_any(tx_req->skb);
1204 netif_tx_lock_bh(p->dev);
1205 if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) &&
1206 netif_queue_stopped(p->dev) &&
1207 test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
1208 netif_wake_queue(p->dev);
1209 netif_tx_unlock_bh(p->dev);
1213 ib_destroy_qp(p->qp);
1219 static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id,
1220 struct ib_cm_event *event)
1222 struct ipoib_cm_tx *tx = cm_id->context;
1223 struct ipoib_dev_priv *priv = netdev_priv(tx->dev);
1224 struct net_device *dev = priv->dev;
1225 struct ipoib_neigh *neigh;
1226 unsigned long flags;
1229 switch (event->event) {
1230 case IB_CM_DREQ_RECEIVED:
1231 ipoib_dbg(priv, "DREQ received.\n");
1232 ib_send_cm_drep(cm_id, NULL, 0);
1234 case IB_CM_REP_RECEIVED:
1235 ipoib_dbg(priv, "REP received.\n");
1236 ret = ipoib_cm_rep_handler(cm_id, event);
1238 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
1241 case IB_CM_REQ_ERROR:
1242 case IB_CM_REJ_RECEIVED:
1243 case IB_CM_TIMEWAIT_EXIT:
1244 ipoib_dbg(priv, "CM error %d.\n", event->event);
1245 netif_tx_lock_bh(dev);
1246 spin_lock_irqsave(&priv->lock, flags);
1251 ipoib_neigh_free(neigh);
1256 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
1257 list_move(&tx->list, &priv->cm.reap_list);
1258 queue_work(ipoib_workqueue, &priv->cm.reap_task);
1261 spin_unlock_irqrestore(&priv->lock, flags);
1262 netif_tx_unlock_bh(dev);
1271 struct ipoib_cm_tx *ipoib_cm_create_tx(struct net_device *dev, struct ipoib_path *path,
1272 struct ipoib_neigh *neigh)
1274 struct ipoib_dev_priv *priv = netdev_priv(dev);
1275 struct ipoib_cm_tx *tx;
1277 tx = kzalloc(sizeof *tx, GFP_ATOMIC);
1285 list_add(&tx->list, &priv->cm.start_list);
1286 set_bit(IPOIB_FLAG_INITIALIZED, &tx->flags);
1287 queue_work(ipoib_workqueue, &priv->cm.start_task);
1291 void ipoib_cm_destroy_tx(struct ipoib_cm_tx *tx)
1293 struct ipoib_dev_priv *priv = netdev_priv(tx->dev);
1294 unsigned long flags;
1295 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
1296 spin_lock_irqsave(&priv->lock, flags);
1297 list_move(&tx->list, &priv->cm.reap_list);
1298 queue_work(ipoib_workqueue, &priv->cm.reap_task);
1299 ipoib_dbg(priv, "Reap connection for gid %pI6\n",
1300 tx->neigh->daddr + 4);
1302 spin_unlock_irqrestore(&priv->lock, flags);
1306 static void ipoib_cm_tx_start(struct work_struct *work)
1308 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1310 struct net_device *dev = priv->dev;
1311 struct ipoib_neigh *neigh;
1312 struct ipoib_cm_tx *p;
1313 unsigned long flags;
1316 struct ib_sa_path_rec pathrec;
1319 netif_tx_lock_bh(dev);
1320 spin_lock_irqsave(&priv->lock, flags);
1322 while (!list_empty(&priv->cm.start_list)) {
1323 p = list_entry(priv->cm.start_list.next, typeof(*p), list);
1324 list_del_init(&p->list);
1326 qpn = IPOIB_QPN(neigh->daddr);
1327 memcpy(&pathrec, &p->path->pathrec, sizeof pathrec);
1329 spin_unlock_irqrestore(&priv->lock, flags);
1330 netif_tx_unlock_bh(dev);
1332 ret = ipoib_cm_tx_init(p, qpn, &pathrec);
1334 netif_tx_lock_bh(dev);
1335 spin_lock_irqsave(&priv->lock, flags);
1341 ipoib_neigh_free(neigh);
1348 spin_unlock_irqrestore(&priv->lock, flags);
1349 netif_tx_unlock_bh(dev);
1352 static void ipoib_cm_tx_reap(struct work_struct *work)
1354 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1356 struct net_device *dev = priv->dev;
1357 struct ipoib_cm_tx *p;
1358 unsigned long flags;
1360 netif_tx_lock_bh(dev);
1361 spin_lock_irqsave(&priv->lock, flags);
1363 while (!list_empty(&priv->cm.reap_list)) {
1364 p = list_entry(priv->cm.reap_list.next, typeof(*p), list);
1366 spin_unlock_irqrestore(&priv->lock, flags);
1367 netif_tx_unlock_bh(dev);
1368 ipoib_cm_tx_destroy(p);
1369 netif_tx_lock_bh(dev);
1370 spin_lock_irqsave(&priv->lock, flags);
1373 spin_unlock_irqrestore(&priv->lock, flags);
1374 netif_tx_unlock_bh(dev);
1377 static void ipoib_cm_skb_reap(struct work_struct *work)
1379 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1381 struct net_device *dev = priv->dev;
1382 struct sk_buff *skb;
1383 unsigned long flags;
1384 unsigned mtu = priv->mcast_mtu;
1386 netif_tx_lock_bh(dev);
1387 spin_lock_irqsave(&priv->lock, flags);
1389 while ((skb = skb_dequeue(&priv->cm.skb_queue))) {
1390 spin_unlock_irqrestore(&priv->lock, flags);
1391 netif_tx_unlock_bh(dev);
1393 if (skb->protocol == htons(ETH_P_IP))
1394 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu));
1395 #if IS_ENABLED(CONFIG_IPV6)
1396 else if (skb->protocol == htons(ETH_P_IPV6))
1397 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1399 dev_kfree_skb_any(skb);
1401 netif_tx_lock_bh(dev);
1402 spin_lock_irqsave(&priv->lock, flags);
1405 spin_unlock_irqrestore(&priv->lock, flags);
1406 netif_tx_unlock_bh(dev);
1409 void ipoib_cm_skb_too_long(struct net_device *dev, struct sk_buff *skb,
1412 struct ipoib_dev_priv *priv = netdev_priv(dev);
1413 int e = skb_queue_empty(&priv->cm.skb_queue);
1416 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
1418 skb_queue_tail(&priv->cm.skb_queue, skb);
1420 queue_work(ipoib_workqueue, &priv->cm.skb_task);
1423 static void ipoib_cm_rx_reap(struct work_struct *work)
1425 ipoib_cm_free_rx_reap_list(container_of(work, struct ipoib_dev_priv,
1426 cm.rx_reap_task)->dev);
1429 static void ipoib_cm_stale_task(struct work_struct *work)
1431 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1432 cm.stale_task.work);
1433 struct ipoib_cm_rx *p;
1436 spin_lock_irq(&priv->lock);
1437 while (!list_empty(&priv->cm.passive_ids)) {
1438 /* List is sorted by LRU, start from tail,
1439 * stop when we see a recently used entry */
1440 p = list_entry(priv->cm.passive_ids.prev, typeof(*p), list);
1441 if (time_before_eq(jiffies, p->jiffies + IPOIB_CM_RX_TIMEOUT))
1443 list_move(&p->list, &priv->cm.rx_error_list);
1444 p->state = IPOIB_CM_RX_ERROR;
1445 spin_unlock_irq(&priv->lock);
1446 ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE);
1448 ipoib_warn(priv, "unable to move qp to error state: %d\n", ret);
1449 spin_lock_irq(&priv->lock);
1452 if (!list_empty(&priv->cm.passive_ids))
1453 queue_delayed_work(ipoib_workqueue,
1454 &priv->cm.stale_task, IPOIB_CM_RX_DELAY);
1455 spin_unlock_irq(&priv->lock);
1459 static ssize_t show_mode(struct device *d, struct device_attribute *attr,
1462 struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(d));
1464 if (test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags))
1465 return sprintf(buf, "connected\n");
1467 return sprintf(buf, "datagram\n");
1470 static ssize_t set_mode(struct device *d, struct device_attribute *attr,
1471 const char *buf, size_t count)
1473 struct net_device *dev = to_net_dev(d);
1476 if (!rtnl_trylock())
1477 return restart_syscall();
1479 ret = ipoib_set_mode(dev, buf);
1489 static DEVICE_ATTR(mode, S_IWUSR | S_IRUGO, show_mode, set_mode);
1491 int ipoib_cm_add_mode_attr(struct net_device *dev)
1493 return device_create_file(&dev->dev, &dev_attr_mode);
1496 static void ipoib_cm_create_srq(struct net_device *dev, int max_sge)
1498 struct ipoib_dev_priv *priv = netdev_priv(dev);
1499 struct ib_srq_init_attr srq_init_attr = {
1500 .srq_type = IB_SRQT_BASIC,
1502 .max_wr = ipoib_recvq_size,
1507 priv->cm.srq = ib_create_srq(priv->pd, &srq_init_attr);
1508 if (IS_ERR(priv->cm.srq)) {
1509 if (PTR_ERR(priv->cm.srq) != -ENOSYS)
1510 printk(KERN_WARNING "%s: failed to allocate SRQ, error %ld\n",
1511 priv->ca->name, PTR_ERR(priv->cm.srq));
1512 priv->cm.srq = NULL;
1516 priv->cm.srq_ring = vzalloc(ipoib_recvq_size * sizeof *priv->cm.srq_ring);
1517 if (!priv->cm.srq_ring) {
1518 printk(KERN_WARNING "%s: failed to allocate CM SRQ ring (%d entries)\n",
1519 priv->ca->name, ipoib_recvq_size);
1520 ib_destroy_srq(priv->cm.srq);
1521 priv->cm.srq = NULL;
1527 int ipoib_cm_dev_init(struct net_device *dev)
1529 struct ipoib_dev_priv *priv = netdev_priv(dev);
1531 struct ib_device_attr attr;
1533 INIT_LIST_HEAD(&priv->cm.passive_ids);
1534 INIT_LIST_HEAD(&priv->cm.reap_list);
1535 INIT_LIST_HEAD(&priv->cm.start_list);
1536 INIT_LIST_HEAD(&priv->cm.rx_error_list);
1537 INIT_LIST_HEAD(&priv->cm.rx_flush_list);
1538 INIT_LIST_HEAD(&priv->cm.rx_drain_list);
1539 INIT_LIST_HEAD(&priv->cm.rx_reap_list);
1540 INIT_WORK(&priv->cm.start_task, ipoib_cm_tx_start);
1541 INIT_WORK(&priv->cm.reap_task, ipoib_cm_tx_reap);
1542 INIT_WORK(&priv->cm.skb_task, ipoib_cm_skb_reap);
1543 INIT_WORK(&priv->cm.rx_reap_task, ipoib_cm_rx_reap);
1544 INIT_DELAYED_WORK(&priv->cm.stale_task, ipoib_cm_stale_task);
1546 skb_queue_head_init(&priv->cm.skb_queue);
1548 ret = ib_query_device(priv->ca, &attr);
1550 printk(KERN_WARNING "ib_query_device() failed with %d\n", ret);
1554 ipoib_dbg(priv, "max_srq_sge=%d\n", attr.max_srq_sge);
1556 attr.max_srq_sge = min_t(int, IPOIB_CM_RX_SG, attr.max_srq_sge);
1557 ipoib_cm_create_srq(dev, attr.max_srq_sge);
1558 if (ipoib_cm_has_srq(dev)) {
1559 priv->cm.max_cm_mtu = attr.max_srq_sge * PAGE_SIZE - 0x10;
1560 priv->cm.num_frags = attr.max_srq_sge;
1561 ipoib_dbg(priv, "max_cm_mtu = 0x%x, num_frags=%d\n",
1562 priv->cm.max_cm_mtu, priv->cm.num_frags);
1564 priv->cm.max_cm_mtu = IPOIB_CM_MTU;
1565 priv->cm.num_frags = IPOIB_CM_RX_SG;
1568 ipoib_cm_init_rx_wr(dev, &priv->cm.rx_wr, priv->cm.rx_sge);
1570 if (ipoib_cm_has_srq(dev)) {
1571 for (i = 0; i < ipoib_recvq_size; ++i) {
1572 if (!ipoib_cm_alloc_rx_skb(dev, priv->cm.srq_ring, i,
1573 priv->cm.num_frags - 1,
1574 priv->cm.srq_ring[i].mapping,
1576 ipoib_warn(priv, "failed to allocate "
1577 "receive buffer %d\n", i);
1578 ipoib_cm_dev_cleanup(dev);
1582 if (ipoib_cm_post_receive_srq(dev, i)) {
1583 ipoib_warn(priv, "ipoib_cm_post_receive_srq "
1584 "failed for buf %d\n", i);
1585 ipoib_cm_dev_cleanup(dev);
1591 priv->dev->dev_addr[0] = IPOIB_FLAGS_RC;
1595 void ipoib_cm_dev_cleanup(struct net_device *dev)
1597 struct ipoib_dev_priv *priv = netdev_priv(dev);
1603 ipoib_dbg(priv, "Cleanup ipoib connected mode.\n");
1605 ret = ib_destroy_srq(priv->cm.srq);
1607 ipoib_warn(priv, "ib_destroy_srq failed: %d\n", ret);
1609 priv->cm.srq = NULL;
1610 if (!priv->cm.srq_ring)
1613 ipoib_cm_free_rx_ring(dev, priv->cm.srq_ring);
1614 priv->cm.srq_ring = NULL;