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>
34 #include <rdma/ib_cache.h>
37 #include <linux/icmpv6.h>
38 #include <linux/delay.h>
39 #include <linux/vmalloc.h>
43 int ipoib_max_conn_qp = 128;
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)");
50 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG_DATA
51 static int data_debug_level;
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");
58 #define IPOIB_CM_IETF_ID 0x1000000000000000ULL
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)
65 static struct ib_qp_attr ipoib_cm_err_attr = {
66 .qp_state = IB_QPS_ERR
69 #define IPOIB_CM_RX_DRAIN_WRID 0xffffffff
71 static struct ib_send_wr ipoib_cm_rx_drain_wr = {
72 .wr_id = IPOIB_CM_RX_DRAIN_WRID,
76 static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id,
77 struct ib_cm_event *event);
79 static void ipoib_cm_dma_unmap_rx(struct ipoib_dev_priv *priv, int frags,
80 u64 mapping[IPOIB_CM_RX_SG])
84 ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_CM_HEAD_SIZE, DMA_FROM_DEVICE);
86 for (i = 0; i < frags; ++i)
87 ib_dma_unmap_single(priv->ca, mapping[i + 1], PAGE_SIZE, DMA_FROM_DEVICE);
90 static int ipoib_cm_post_receive_srq(struct net_device *dev, int id)
92 struct ipoib_dev_priv *priv = netdev_priv(dev);
93 struct ib_recv_wr *bad_wr;
96 priv->cm.rx_wr.wr_id = id | IPOIB_OP_CM | IPOIB_OP_RECV;
98 for (i = 0; i < priv->cm.num_frags; ++i)
99 priv->cm.rx_sge[i].addr = priv->cm.srq_ring[id].mapping[i];
101 ret = ib_post_srq_recv(priv->cm.srq, &priv->cm.rx_wr, &bad_wr);
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;
113 static int ipoib_cm_post_receive_nonsrq(struct net_device *dev,
114 struct ipoib_cm_rx *rx, int id)
116 struct ipoib_dev_priv *priv = netdev_priv(dev);
117 struct ib_recv_wr *bad_wr;
120 priv->cm.rx_wr.wr_id = id | IPOIB_OP_CM | IPOIB_OP_RECV;
122 for (i = 0; i < IPOIB_CM_RX_SG; ++i)
123 priv->cm.rx_sge[i].addr = rx->rx_ring[id].mapping[i];
125 ret = ib_post_recv(rx->qp, &priv->cm.rx_wr, &bad_wr);
127 ipoib_warn(priv, "post recv failed for buf %d (%d)\n", id, ret);
128 ipoib_cm_dma_unmap_rx(priv, IPOIB_CM_RX_SG - 1,
129 rx->rx_ring[id].mapping);
130 dev_kfree_skb_any(rx->rx_ring[id].skb);
131 rx->rx_ring[id].skb = NULL;
137 static struct sk_buff *ipoib_cm_alloc_rx_skb(struct net_device *dev,
138 struct ipoib_cm_rx_buf *rx_ring,
140 u64 mapping[IPOIB_CM_RX_SG])
142 struct ipoib_dev_priv *priv = netdev_priv(dev);
146 skb = dev_alloc_skb(IPOIB_CM_HEAD_SIZE + 12);
151 * IPoIB adds a 4 byte header. So we need 12 more bytes to align the
152 * IP header to a multiple of 16.
154 skb_reserve(skb, 12);
156 mapping[0] = ib_dma_map_single(priv->ca, skb->data, IPOIB_CM_HEAD_SIZE,
158 if (unlikely(ib_dma_mapping_error(priv->ca, mapping[0]))) {
159 dev_kfree_skb_any(skb);
163 for (i = 0; i < frags; i++) {
164 struct page *page = alloc_page(GFP_ATOMIC);
168 skb_fill_page_desc(skb, i, page, 0, PAGE_SIZE);
170 mapping[i + 1] = ib_dma_map_page(priv->ca, skb_shinfo(skb)->frags[i].page,
171 0, PAGE_SIZE, DMA_FROM_DEVICE);
172 if (unlikely(ib_dma_mapping_error(priv->ca, mapping[i + 1])))
176 rx_ring[id].skb = skb;
181 ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_CM_HEAD_SIZE, DMA_FROM_DEVICE);
184 ib_dma_unmap_single(priv->ca, mapping[i], PAGE_SIZE, DMA_FROM_DEVICE);
186 dev_kfree_skb_any(skb);
190 static void ipoib_cm_free_rx_ring(struct net_device *dev,
191 struct ipoib_cm_rx_buf *rx_ring)
193 struct ipoib_dev_priv *priv = netdev_priv(dev);
196 for (i = 0; i < ipoib_recvq_size; ++i)
197 if (rx_ring[i].skb) {
198 ipoib_cm_dma_unmap_rx(priv, IPOIB_CM_RX_SG - 1,
200 dev_kfree_skb_any(rx_ring[i].skb);
206 static void ipoib_cm_start_rx_drain(struct ipoib_dev_priv *priv)
208 struct ib_send_wr *bad_wr;
209 struct ipoib_cm_rx *p;
211 /* We only reserved 1 extra slot in CQ for drain WRs, so
212 * make sure we have at most 1 outstanding WR. */
213 if (list_empty(&priv->cm.rx_flush_list) ||
214 !list_empty(&priv->cm.rx_drain_list))
218 * QPs on flush list are error state. This way, a "flush
219 * error" WC will be immediately generated for each WR we post.
221 p = list_entry(priv->cm.rx_flush_list.next, typeof(*p), list);
222 if (ib_post_send(p->qp, &ipoib_cm_rx_drain_wr, &bad_wr))
223 ipoib_warn(priv, "failed to post drain wr\n");
225 list_splice_init(&priv->cm.rx_flush_list, &priv->cm.rx_drain_list);
228 static void ipoib_cm_rx_event_handler(struct ib_event *event, void *ctx)
230 struct ipoib_cm_rx *p = ctx;
231 struct ipoib_dev_priv *priv = netdev_priv(p->dev);
234 if (event->event != IB_EVENT_QP_LAST_WQE_REACHED)
237 spin_lock_irqsave(&priv->lock, flags);
238 list_move(&p->list, &priv->cm.rx_flush_list);
239 p->state = IPOIB_CM_RX_FLUSH;
240 ipoib_cm_start_rx_drain(priv);
241 spin_unlock_irqrestore(&priv->lock, flags);
244 static struct ib_qp *ipoib_cm_create_rx_qp(struct net_device *dev,
245 struct ipoib_cm_rx *p)
247 struct ipoib_dev_priv *priv = netdev_priv(dev);
248 struct ib_qp_init_attr attr = {
249 .event_handler = ipoib_cm_rx_event_handler,
250 .send_cq = priv->recv_cq, /* For drain WR */
251 .recv_cq = priv->recv_cq,
253 .cap.max_send_wr = 1, /* For drain WR */
254 .cap.max_send_sge = 1, /* FIXME: 0 Seems not to work */
255 .sq_sig_type = IB_SIGNAL_ALL_WR,
256 .qp_type = IB_QPT_RC,
260 if (!ipoib_cm_has_srq(dev)) {
261 attr.cap.max_recv_wr = ipoib_recvq_size;
262 attr.cap.max_recv_sge = IPOIB_CM_RX_SG;
265 return ib_create_qp(priv->pd, &attr);
268 static int ipoib_cm_modify_rx_qp(struct net_device *dev,
269 struct ib_cm_id *cm_id, struct ib_qp *qp,
272 struct ipoib_dev_priv *priv = netdev_priv(dev);
273 struct ib_qp_attr qp_attr;
274 int qp_attr_mask, ret;
276 qp_attr.qp_state = IB_QPS_INIT;
277 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
279 ipoib_warn(priv, "failed to init QP attr for INIT: %d\n", ret);
282 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
284 ipoib_warn(priv, "failed to modify QP to INIT: %d\n", ret);
287 qp_attr.qp_state = IB_QPS_RTR;
288 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
290 ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret);
293 qp_attr.rq_psn = psn;
294 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
296 ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret);
301 * Current Mellanox HCA firmware won't generate completions
302 * with error for drain WRs unless the QP has been moved to
303 * RTS first. This work-around leaves a window where a QP has
304 * moved to error asynchronously, but this will eventually get
305 * fixed in firmware, so let's not error out if modify QP
308 qp_attr.qp_state = IB_QPS_RTS;
309 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
311 ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret);
314 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
316 ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret);
323 static int ipoib_cm_nonsrq_init_rx(struct net_device *dev, struct ib_cm_id *cm_id,
324 struct ipoib_cm_rx *rx)
326 struct ipoib_dev_priv *priv = netdev_priv(dev);
330 rx->rx_ring = kcalloc(ipoib_recvq_size, sizeof *rx->rx_ring, GFP_KERNEL);
334 spin_lock_irq(&priv->lock);
336 if (priv->cm.nonsrq_conn_qp >= ipoib_max_conn_qp) {
337 spin_unlock_irq(&priv->lock);
338 ib_send_cm_rej(cm_id, IB_CM_REJ_NO_QP, NULL, 0, NULL, 0);
342 ++priv->cm.nonsrq_conn_qp;
344 spin_unlock_irq(&priv->lock);
346 for (i = 0; i < ipoib_recvq_size; ++i) {
347 if (!ipoib_cm_alloc_rx_skb(dev, rx->rx_ring, i, IPOIB_CM_RX_SG - 1,
348 rx->rx_ring[i].mapping)) {
349 ipoib_warn(priv, "failed to allocate receive buffer %d\n", i);
353 ret = ipoib_cm_post_receive_nonsrq(dev, rx, i);
355 ipoib_warn(priv, "ipoib_cm_post_receive_nonsrq "
356 "failed for buf %d\n", i);
362 rx->recv_count = ipoib_recvq_size;
367 spin_lock_irq(&priv->lock);
368 --priv->cm.nonsrq_conn_qp;
369 spin_unlock_irq(&priv->lock);
372 ipoib_cm_free_rx_ring(dev, rx->rx_ring);
377 static int ipoib_cm_send_rep(struct net_device *dev, struct ib_cm_id *cm_id,
378 struct ib_qp *qp, struct ib_cm_req_event_param *req,
381 struct ipoib_dev_priv *priv = netdev_priv(dev);
382 struct ipoib_cm_data data = {};
383 struct ib_cm_rep_param rep = {};
385 data.qpn = cpu_to_be32(priv->qp->qp_num);
386 data.mtu = cpu_to_be32(IPOIB_CM_BUF_SIZE);
388 rep.private_data = &data;
389 rep.private_data_len = sizeof data;
390 rep.flow_control = 0;
391 rep.rnr_retry_count = req->rnr_retry_count;
392 rep.srq = ipoib_cm_has_srq(dev);
393 rep.qp_num = qp->qp_num;
394 rep.starting_psn = psn;
395 return ib_send_cm_rep(cm_id, &rep);
398 static int ipoib_cm_req_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
400 struct net_device *dev = cm_id->context;
401 struct ipoib_dev_priv *priv = netdev_priv(dev);
402 struct ipoib_cm_rx *p;
406 ipoib_dbg(priv, "REQ arrived\n");
407 p = kzalloc(sizeof *p, GFP_KERNEL);
413 p->state = IPOIB_CM_RX_LIVE;
414 p->jiffies = jiffies;
415 INIT_LIST_HEAD(&p->list);
417 p->qp = ipoib_cm_create_rx_qp(dev, p);
419 ret = PTR_ERR(p->qp);
423 psn = random32() & 0xffffff;
424 ret = ipoib_cm_modify_rx_qp(dev, cm_id, p->qp, psn);
428 if (!ipoib_cm_has_srq(dev)) {
429 ret = ipoib_cm_nonsrq_init_rx(dev, cm_id, p);
434 spin_lock_irq(&priv->lock);
435 queue_delayed_work(ipoib_workqueue,
436 &priv->cm.stale_task, IPOIB_CM_RX_DELAY);
437 /* Add this entry to passive ids list head, but do not re-add it
438 * if IB_EVENT_QP_LAST_WQE_REACHED has moved it to flush list. */
439 p->jiffies = jiffies;
440 if (p->state == IPOIB_CM_RX_LIVE)
441 list_move(&p->list, &priv->cm.passive_ids);
442 spin_unlock_irq(&priv->lock);
444 ret = ipoib_cm_send_rep(dev, cm_id, p->qp, &event->param.req_rcvd, psn);
446 ipoib_warn(priv, "failed to send REP: %d\n", ret);
447 if (ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE))
448 ipoib_warn(priv, "unable to move qp to error state\n");
453 ib_destroy_qp(p->qp);
459 static int ipoib_cm_rx_handler(struct ib_cm_id *cm_id,
460 struct ib_cm_event *event)
462 struct ipoib_cm_rx *p;
463 struct ipoib_dev_priv *priv;
465 switch (event->event) {
466 case IB_CM_REQ_RECEIVED:
467 return ipoib_cm_req_handler(cm_id, event);
468 case IB_CM_DREQ_RECEIVED:
470 ib_send_cm_drep(cm_id, NULL, 0);
472 case IB_CM_REJ_RECEIVED:
474 priv = netdev_priv(p->dev);
475 if (ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE))
476 ipoib_warn(priv, "unable to move qp to error state\n");
482 /* Adjust length of skb with fragments to match received data */
483 static void skb_put_frags(struct sk_buff *skb, unsigned int hdr_space,
484 unsigned int length, struct sk_buff *toskb)
489 /* put header into skb */
490 size = min(length, hdr_space);
495 num_frags = skb_shinfo(skb)->nr_frags;
496 for (i = 0; i < num_frags; i++) {
497 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
500 /* don't need this page */
501 skb_fill_page_desc(toskb, i, frag->page, 0, PAGE_SIZE);
502 --skb_shinfo(skb)->nr_frags;
504 size = min(length, (unsigned) PAGE_SIZE);
507 skb->data_len += size;
508 skb->truesize += size;
515 void ipoib_cm_handle_rx_wc(struct net_device *dev, struct ib_wc *wc)
517 struct ipoib_dev_priv *priv = netdev_priv(dev);
518 struct ipoib_cm_rx_buf *rx_ring;
519 unsigned int wr_id = wc->wr_id & ~(IPOIB_OP_CM | IPOIB_OP_RECV);
520 struct sk_buff *skb, *newskb;
521 struct ipoib_cm_rx *p;
523 u64 mapping[IPOIB_CM_RX_SG];
527 ipoib_dbg_data(priv, "cm recv completion: id %d, status: %d\n",
530 if (unlikely(wr_id >= ipoib_recvq_size)) {
531 if (wr_id == (IPOIB_CM_RX_DRAIN_WRID & ~(IPOIB_OP_CM | IPOIB_OP_RECV))) {
532 spin_lock_irqsave(&priv->lock, flags);
533 list_splice_init(&priv->cm.rx_drain_list, &priv->cm.rx_reap_list);
534 ipoib_cm_start_rx_drain(priv);
535 queue_work(ipoib_workqueue, &priv->cm.rx_reap_task);
536 spin_unlock_irqrestore(&priv->lock, flags);
538 ipoib_warn(priv, "cm recv completion event with wrid %d (> %d)\n",
539 wr_id, ipoib_recvq_size);
543 p = wc->qp->qp_context;
545 has_srq = ipoib_cm_has_srq(dev);
546 rx_ring = has_srq ? priv->cm.srq_ring : p->rx_ring;
548 skb = rx_ring[wr_id].skb;
550 if (unlikely(wc->status != IB_WC_SUCCESS)) {
551 ipoib_dbg(priv, "cm recv error "
552 "(status=%d, wrid=%d vend_err %x)\n",
553 wc->status, wr_id, wc->vendor_err);
554 ++dev->stats.rx_dropped;
558 if (!--p->recv_count) {
559 spin_lock_irqsave(&priv->lock, flags);
560 list_move(&p->list, &priv->cm.rx_reap_list);
561 spin_unlock_irqrestore(&priv->lock, flags);
562 queue_work(ipoib_workqueue, &priv->cm.rx_reap_task);
568 if (unlikely(!(wr_id & IPOIB_CM_RX_UPDATE_MASK))) {
569 if (p && time_after_eq(jiffies, p->jiffies + IPOIB_CM_RX_UPDATE_TIME)) {
570 spin_lock_irqsave(&priv->lock, flags);
571 p->jiffies = jiffies;
572 /* Move this entry to list head, but do not re-add it
573 * if it has been moved out of list. */
574 if (p->state == IPOIB_CM_RX_LIVE)
575 list_move(&p->list, &priv->cm.passive_ids);
576 spin_unlock_irqrestore(&priv->lock, flags);
580 frags = PAGE_ALIGN(wc->byte_len - min(wc->byte_len,
581 (unsigned)IPOIB_CM_HEAD_SIZE)) / PAGE_SIZE;
583 newskb = ipoib_cm_alloc_rx_skb(dev, rx_ring, wr_id, frags, mapping);
584 if (unlikely(!newskb)) {
586 * If we can't allocate a new RX buffer, dump
587 * this packet and reuse the old buffer.
589 ipoib_dbg(priv, "failed to allocate receive buffer %d\n", wr_id);
590 ++dev->stats.rx_dropped;
594 ipoib_cm_dma_unmap_rx(priv, frags, rx_ring[wr_id].mapping);
595 memcpy(rx_ring[wr_id].mapping, mapping, (frags + 1) * sizeof *mapping);
597 ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n",
598 wc->byte_len, wc->slid);
600 skb_put_frags(skb, IPOIB_CM_HEAD_SIZE, wc->byte_len, newskb);
602 skb->protocol = ((struct ipoib_header *) skb->data)->proto;
603 skb_reset_mac_header(skb);
604 skb_pull(skb, IPOIB_ENCAP_LEN);
606 dev->last_rx = jiffies;
607 ++dev->stats.rx_packets;
608 dev->stats.rx_bytes += skb->len;
611 /* XXX get correct PACKET_ type here */
612 skb->pkt_type = PACKET_HOST;
613 netif_receive_skb(skb);
617 if (unlikely(ipoib_cm_post_receive_srq(dev, wr_id)))
618 ipoib_warn(priv, "ipoib_cm_post_receive_srq failed "
619 "for buf %d\n", wr_id);
621 if (unlikely(ipoib_cm_post_receive_nonsrq(dev, p, wr_id))) {
623 ipoib_warn(priv, "ipoib_cm_post_receive_nonsrq failed "
624 "for buf %d\n", wr_id);
629 static inline int post_send(struct ipoib_dev_priv *priv,
630 struct ipoib_cm_tx *tx,
634 struct ib_send_wr *bad_wr;
636 priv->tx_sge[0].addr = addr;
637 priv->tx_sge[0].length = len;
639 priv->tx_wr.num_sge = 1;
640 priv->tx_wr.wr_id = wr_id | IPOIB_OP_CM;
642 return ib_post_send(tx->qp, &priv->tx_wr, &bad_wr);
645 void ipoib_cm_send(struct net_device *dev, struct sk_buff *skb, struct ipoib_cm_tx *tx)
647 struct ipoib_dev_priv *priv = netdev_priv(dev);
648 struct ipoib_tx_buf *tx_req;
651 if (unlikely(skb->len > tx->mtu)) {
652 ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n",
654 ++dev->stats.tx_dropped;
655 ++dev->stats.tx_errors;
656 ipoib_cm_skb_too_long(dev, skb, tx->mtu - IPOIB_ENCAP_LEN);
660 ipoib_dbg_data(priv, "sending packet: head 0x%x length %d connection 0x%x\n",
661 tx->tx_head, skb->len, tx->qp->qp_num);
664 * We put the skb into the tx_ring _before_ we call post_send()
665 * because it's entirely possible that the completion handler will
666 * run before we execute anything after the post_send(). That
667 * means we have to make sure everything is properly recorded and
668 * our state is consistent before we call post_send().
670 tx_req = &tx->tx_ring[tx->tx_head & (ipoib_sendq_size - 1)];
672 addr = ib_dma_map_single(priv->ca, skb->data, skb->len, DMA_TO_DEVICE);
673 if (unlikely(ib_dma_mapping_error(priv->ca, addr))) {
674 ++dev->stats.tx_errors;
675 dev_kfree_skb_any(skb);
679 tx_req->mapping[0] = addr;
681 if (unlikely(post_send(priv, tx, tx->tx_head & (ipoib_sendq_size - 1),
683 ipoib_warn(priv, "post_send failed\n");
684 ++dev->stats.tx_errors;
685 ib_dma_unmap_single(priv->ca, addr, skb->len, DMA_TO_DEVICE);
686 dev_kfree_skb_any(skb);
688 dev->trans_start = jiffies;
691 if (++priv->tx_outstanding == ipoib_sendq_size) {
692 ipoib_dbg(priv, "TX ring 0x%x full, stopping kernel net queue\n",
694 netif_stop_queue(dev);
699 void ipoib_cm_handle_tx_wc(struct net_device *dev, struct ib_wc *wc)
701 struct ipoib_dev_priv *priv = netdev_priv(dev);
702 struct ipoib_cm_tx *tx = wc->qp->qp_context;
703 unsigned int wr_id = wc->wr_id & ~IPOIB_OP_CM;
704 struct ipoib_tx_buf *tx_req;
707 ipoib_dbg_data(priv, "cm send completion: id %d, status: %d\n",
710 if (unlikely(wr_id >= ipoib_sendq_size)) {
711 ipoib_warn(priv, "cm send completion event with wrid %d (> %d)\n",
712 wr_id, ipoib_sendq_size);
716 tx_req = &tx->tx_ring[wr_id];
718 ib_dma_unmap_single(priv->ca, tx_req->mapping[0], tx_req->skb->len, DMA_TO_DEVICE);
720 /* FIXME: is this right? Shouldn't we only increment on success? */
721 ++dev->stats.tx_packets;
722 dev->stats.tx_bytes += tx_req->skb->len;
724 dev_kfree_skb_any(tx_req->skb);
726 spin_lock_irqsave(&priv->tx_lock, flags);
728 if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) &&
729 netif_queue_stopped(dev) &&
730 test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
731 netif_wake_queue(dev);
733 if (wc->status != IB_WC_SUCCESS &&
734 wc->status != IB_WC_WR_FLUSH_ERR) {
735 struct ipoib_neigh *neigh;
737 ipoib_dbg(priv, "failed cm send event "
738 "(status=%d, wrid=%d vend_err %x)\n",
739 wc->status, wr_id, wc->vendor_err);
741 spin_lock(&priv->lock);
746 list_del(&neigh->list);
748 ipoib_put_ah(neigh->ah);
749 ipoib_neigh_free(dev, neigh);
754 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
755 list_move(&tx->list, &priv->cm.reap_list);
756 queue_work(ipoib_workqueue, &priv->cm.reap_task);
759 clear_bit(IPOIB_FLAG_OPER_UP, &tx->flags);
761 spin_unlock(&priv->lock);
764 spin_unlock_irqrestore(&priv->tx_lock, flags);
767 int ipoib_cm_dev_open(struct net_device *dev)
769 struct ipoib_dev_priv *priv = netdev_priv(dev);
772 if (!IPOIB_CM_SUPPORTED(dev->dev_addr))
775 priv->cm.id = ib_create_cm_id(priv->ca, ipoib_cm_rx_handler, dev);
776 if (IS_ERR(priv->cm.id)) {
777 printk(KERN_WARNING "%s: failed to create CM ID\n", priv->ca->name);
778 ret = PTR_ERR(priv->cm.id);
782 ret = ib_cm_listen(priv->cm.id, cpu_to_be64(IPOIB_CM_IETF_ID | priv->qp->qp_num),
785 printk(KERN_WARNING "%s: failed to listen on ID 0x%llx\n", priv->ca->name,
786 IPOIB_CM_IETF_ID | priv->qp->qp_num);
793 ib_destroy_cm_id(priv->cm.id);
799 static void ipoib_cm_free_rx_reap_list(struct net_device *dev)
801 struct ipoib_dev_priv *priv = netdev_priv(dev);
802 struct ipoib_cm_rx *rx, *n;
805 spin_lock_irq(&priv->lock);
806 list_splice_init(&priv->cm.rx_reap_list, &list);
807 spin_unlock_irq(&priv->lock);
809 list_for_each_entry_safe(rx, n, &list, list) {
810 ib_destroy_cm_id(rx->id);
811 ib_destroy_qp(rx->qp);
812 if (!ipoib_cm_has_srq(dev)) {
813 ipoib_cm_free_rx_ring(priv->dev, rx->rx_ring);
814 spin_lock_irq(&priv->lock);
815 --priv->cm.nonsrq_conn_qp;
816 spin_unlock_irq(&priv->lock);
822 void ipoib_cm_dev_stop(struct net_device *dev)
824 struct ipoib_dev_priv *priv = netdev_priv(dev);
825 struct ipoib_cm_rx *p;
829 if (!IPOIB_CM_SUPPORTED(dev->dev_addr) || !priv->cm.id)
832 ib_destroy_cm_id(priv->cm.id);
835 spin_lock_irq(&priv->lock);
836 while (!list_empty(&priv->cm.passive_ids)) {
837 p = list_entry(priv->cm.passive_ids.next, typeof(*p), list);
838 list_move(&p->list, &priv->cm.rx_error_list);
839 p->state = IPOIB_CM_RX_ERROR;
840 spin_unlock_irq(&priv->lock);
841 ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE);
843 ipoib_warn(priv, "unable to move qp to error state: %d\n", ret);
844 spin_lock_irq(&priv->lock);
847 /* Wait for all RX to be drained */
850 while (!list_empty(&priv->cm.rx_error_list) ||
851 !list_empty(&priv->cm.rx_flush_list) ||
852 !list_empty(&priv->cm.rx_drain_list)) {
853 if (time_after(jiffies, begin + 5 * HZ)) {
854 ipoib_warn(priv, "RX drain timing out\n");
857 * assume the HW is wedged and just free up everything.
859 list_splice_init(&priv->cm.rx_flush_list,
860 &priv->cm.rx_reap_list);
861 list_splice_init(&priv->cm.rx_error_list,
862 &priv->cm.rx_reap_list);
863 list_splice_init(&priv->cm.rx_drain_list,
864 &priv->cm.rx_reap_list);
867 spin_unlock_irq(&priv->lock);
870 spin_lock_irq(&priv->lock);
873 spin_unlock_irq(&priv->lock);
875 ipoib_cm_free_rx_reap_list(dev);
877 cancel_delayed_work(&priv->cm.stale_task);
880 static int ipoib_cm_rep_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
882 struct ipoib_cm_tx *p = cm_id->context;
883 struct ipoib_dev_priv *priv = netdev_priv(p->dev);
884 struct ipoib_cm_data *data = event->private_data;
885 struct sk_buff_head skqueue;
886 struct ib_qp_attr qp_attr;
887 int qp_attr_mask, ret;
890 p->mtu = be32_to_cpu(data->mtu);
892 if (p->mtu <= IPOIB_ENCAP_LEN) {
893 ipoib_warn(priv, "Rejecting connection: mtu %d <= %d\n",
894 p->mtu, IPOIB_ENCAP_LEN);
898 qp_attr.qp_state = IB_QPS_RTR;
899 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
901 ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret);
905 qp_attr.rq_psn = 0 /* FIXME */;
906 ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask);
908 ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret);
912 qp_attr.qp_state = IB_QPS_RTS;
913 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
915 ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret);
918 ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask);
920 ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret);
924 skb_queue_head_init(&skqueue);
926 spin_lock_irq(&priv->lock);
927 set_bit(IPOIB_FLAG_OPER_UP, &p->flags);
929 while ((skb = __skb_dequeue(&p->neigh->queue)))
930 __skb_queue_tail(&skqueue, skb);
931 spin_unlock_irq(&priv->lock);
933 while ((skb = __skb_dequeue(&skqueue))) {
935 if (dev_queue_xmit(skb))
936 ipoib_warn(priv, "dev_queue_xmit failed "
937 "to requeue packet\n");
940 ret = ib_send_cm_rtu(cm_id, NULL, 0);
942 ipoib_warn(priv, "failed to send RTU: %d\n", ret);
948 static struct ib_qp *ipoib_cm_create_tx_qp(struct net_device *dev, struct ipoib_cm_tx *tx)
950 struct ipoib_dev_priv *priv = netdev_priv(dev);
951 struct ib_qp_init_attr attr = {
952 .send_cq = priv->recv_cq,
953 .recv_cq = priv->recv_cq,
955 .cap.max_send_wr = ipoib_sendq_size,
956 .cap.max_send_sge = 1,
957 .sq_sig_type = IB_SIGNAL_ALL_WR,
958 .qp_type = IB_QPT_RC,
962 return ib_create_qp(priv->pd, &attr);
965 static int ipoib_cm_send_req(struct net_device *dev,
966 struct ib_cm_id *id, struct ib_qp *qp,
968 struct ib_sa_path_rec *pathrec)
970 struct ipoib_dev_priv *priv = netdev_priv(dev);
971 struct ipoib_cm_data data = {};
972 struct ib_cm_req_param req = {};
974 data.qpn = cpu_to_be32(priv->qp->qp_num);
975 data.mtu = cpu_to_be32(IPOIB_CM_BUF_SIZE);
977 req.primary_path = pathrec;
978 req.alternate_path = NULL;
979 req.service_id = cpu_to_be64(IPOIB_CM_IETF_ID | qpn);
980 req.qp_num = qp->qp_num;
981 req.qp_type = qp->qp_type;
982 req.private_data = &data;
983 req.private_data_len = sizeof data;
984 req.flow_control = 0;
986 req.starting_psn = 0; /* FIXME */
989 * Pick some arbitrary defaults here; we could make these
990 * module parameters if anyone cared about setting them.
992 req.responder_resources = 4;
993 req.remote_cm_response_timeout = 20;
994 req.local_cm_response_timeout = 20;
995 req.retry_count = 0; /* RFC draft warns against retries */
996 req.rnr_retry_count = 0; /* RFC draft warns against retries */
997 req.max_cm_retries = 15;
998 req.srq = ipoib_cm_has_srq(dev);
999 return ib_send_cm_req(id, &req);
1002 static int ipoib_cm_modify_tx_init(struct net_device *dev,
1003 struct ib_cm_id *cm_id, struct ib_qp *qp)
1005 struct ipoib_dev_priv *priv = netdev_priv(dev);
1006 struct ib_qp_attr qp_attr;
1007 int qp_attr_mask, ret;
1008 ret = ib_find_pkey(priv->ca, priv->port, priv->pkey, &qp_attr.pkey_index);
1010 ipoib_warn(priv, "pkey 0x%x not found: %d\n", priv->pkey, ret);
1014 qp_attr.qp_state = IB_QPS_INIT;
1015 qp_attr.qp_access_flags = IB_ACCESS_LOCAL_WRITE;
1016 qp_attr.port_num = priv->port;
1017 qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS | IB_QP_PKEY_INDEX | IB_QP_PORT;
1019 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
1021 ipoib_warn(priv, "failed to modify tx QP to INIT: %d\n", ret);
1027 static int ipoib_cm_tx_init(struct ipoib_cm_tx *p, u32 qpn,
1028 struct ib_sa_path_rec *pathrec)
1030 struct ipoib_dev_priv *priv = netdev_priv(p->dev);
1033 p->tx_ring = vmalloc(ipoib_sendq_size * sizeof *p->tx_ring);
1035 ipoib_warn(priv, "failed to allocate tx ring\n");
1039 memset(p->tx_ring, 0, ipoib_sendq_size * sizeof *p->tx_ring);
1041 p->qp = ipoib_cm_create_tx_qp(p->dev, p);
1042 if (IS_ERR(p->qp)) {
1043 ret = PTR_ERR(p->qp);
1044 ipoib_warn(priv, "failed to allocate tx qp: %d\n", ret);
1048 p->id = ib_create_cm_id(priv->ca, ipoib_cm_tx_handler, p);
1049 if (IS_ERR(p->id)) {
1050 ret = PTR_ERR(p->id);
1051 ipoib_warn(priv, "failed to create tx cm id: %d\n", ret);
1055 ret = ipoib_cm_modify_tx_init(p->dev, p->id, p->qp);
1057 ipoib_warn(priv, "failed to modify tx qp to rtr: %d\n", ret);
1061 ret = ipoib_cm_send_req(p->dev, p->id, p->qp, qpn, pathrec);
1063 ipoib_warn(priv, "failed to send cm req: %d\n", ret);
1067 ipoib_dbg(priv, "Request connection 0x%x for gid " IPOIB_GID_FMT " qpn 0x%x\n",
1068 p->qp->qp_num, IPOIB_GID_ARG(pathrec->dgid), qpn);
1074 ib_destroy_cm_id(p->id);
1077 ib_destroy_qp(p->qp);
1085 static void ipoib_cm_tx_destroy(struct ipoib_cm_tx *p)
1087 struct ipoib_dev_priv *priv = netdev_priv(p->dev);
1088 struct ipoib_tx_buf *tx_req;
1089 unsigned long flags;
1090 unsigned long begin;
1092 ipoib_dbg(priv, "Destroy active connection 0x%x head 0x%x tail 0x%x\n",
1093 p->qp ? p->qp->qp_num : 0, p->tx_head, p->tx_tail);
1096 ib_destroy_cm_id(p->id);
1099 /* Wait for all sends to complete */
1101 while ((int) p->tx_tail - (int) p->tx_head < 0) {
1102 if (time_after(jiffies, begin + 5 * HZ)) {
1103 ipoib_warn(priv, "timing out; %d sends not completed\n",
1104 p->tx_head - p->tx_tail);
1114 while ((int) p->tx_tail - (int) p->tx_head < 0) {
1115 tx_req = &p->tx_ring[p->tx_tail & (ipoib_sendq_size - 1)];
1116 ib_dma_unmap_single(priv->ca, tx_req->mapping[0], tx_req->skb->len,
1118 dev_kfree_skb_any(tx_req->skb);
1120 spin_lock_irqsave(&priv->tx_lock, flags);
1121 if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) &&
1122 netif_queue_stopped(p->dev) &&
1123 test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
1124 netif_wake_queue(p->dev);
1125 spin_unlock_irqrestore(&priv->tx_lock, flags);
1129 ib_destroy_qp(p->qp);
1135 static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id,
1136 struct ib_cm_event *event)
1138 struct ipoib_cm_tx *tx = cm_id->context;
1139 struct ipoib_dev_priv *priv = netdev_priv(tx->dev);
1140 struct net_device *dev = priv->dev;
1141 struct ipoib_neigh *neigh;
1144 switch (event->event) {
1145 case IB_CM_DREQ_RECEIVED:
1146 ipoib_dbg(priv, "DREQ received.\n");
1147 ib_send_cm_drep(cm_id, NULL, 0);
1149 case IB_CM_REP_RECEIVED:
1150 ipoib_dbg(priv, "REP received.\n");
1151 ret = ipoib_cm_rep_handler(cm_id, event);
1153 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
1156 case IB_CM_REQ_ERROR:
1157 case IB_CM_REJ_RECEIVED:
1158 case IB_CM_TIMEWAIT_EXIT:
1159 ipoib_dbg(priv, "CM error %d.\n", event->event);
1160 spin_lock_irq(&priv->tx_lock);
1161 spin_lock(&priv->lock);
1166 list_del(&neigh->list);
1168 ipoib_put_ah(neigh->ah);
1169 ipoib_neigh_free(dev, neigh);
1174 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
1175 list_move(&tx->list, &priv->cm.reap_list);
1176 queue_work(ipoib_workqueue, &priv->cm.reap_task);
1179 spin_unlock(&priv->lock);
1180 spin_unlock_irq(&priv->tx_lock);
1189 struct ipoib_cm_tx *ipoib_cm_create_tx(struct net_device *dev, struct ipoib_path *path,
1190 struct ipoib_neigh *neigh)
1192 struct ipoib_dev_priv *priv = netdev_priv(dev);
1193 struct ipoib_cm_tx *tx;
1195 tx = kzalloc(sizeof *tx, GFP_ATOMIC);
1203 list_add(&tx->list, &priv->cm.start_list);
1204 set_bit(IPOIB_FLAG_INITIALIZED, &tx->flags);
1205 queue_work(ipoib_workqueue, &priv->cm.start_task);
1209 void ipoib_cm_destroy_tx(struct ipoib_cm_tx *tx)
1211 struct ipoib_dev_priv *priv = netdev_priv(tx->dev);
1212 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
1213 list_move(&tx->list, &priv->cm.reap_list);
1214 queue_work(ipoib_workqueue, &priv->cm.reap_task);
1215 ipoib_dbg(priv, "Reap connection for gid " IPOIB_GID_FMT "\n",
1216 IPOIB_GID_ARG(tx->neigh->dgid));
1221 static void ipoib_cm_tx_start(struct work_struct *work)
1223 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1225 struct net_device *dev = priv->dev;
1226 struct ipoib_neigh *neigh;
1227 struct ipoib_cm_tx *p;
1228 unsigned long flags;
1231 struct ib_sa_path_rec pathrec;
1234 spin_lock_irqsave(&priv->tx_lock, flags);
1235 spin_lock(&priv->lock);
1236 while (!list_empty(&priv->cm.start_list)) {
1237 p = list_entry(priv->cm.start_list.next, typeof(*p), list);
1238 list_del_init(&p->list);
1240 qpn = IPOIB_QPN(neigh->neighbour->ha);
1241 memcpy(&pathrec, &p->path->pathrec, sizeof pathrec);
1242 spin_unlock(&priv->lock);
1243 spin_unlock_irqrestore(&priv->tx_lock, flags);
1244 ret = ipoib_cm_tx_init(p, qpn, &pathrec);
1245 spin_lock_irqsave(&priv->tx_lock, flags);
1246 spin_lock(&priv->lock);
1251 list_del(&neigh->list);
1253 ipoib_put_ah(neigh->ah);
1254 ipoib_neigh_free(dev, neigh);
1260 spin_unlock(&priv->lock);
1261 spin_unlock_irqrestore(&priv->tx_lock, flags);
1264 static void ipoib_cm_tx_reap(struct work_struct *work)
1266 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1268 struct ipoib_cm_tx *p;
1270 spin_lock_irq(&priv->tx_lock);
1271 spin_lock(&priv->lock);
1272 while (!list_empty(&priv->cm.reap_list)) {
1273 p = list_entry(priv->cm.reap_list.next, typeof(*p), list);
1275 spin_unlock(&priv->lock);
1276 spin_unlock_irq(&priv->tx_lock);
1277 ipoib_cm_tx_destroy(p);
1278 spin_lock_irq(&priv->tx_lock);
1279 spin_lock(&priv->lock);
1281 spin_unlock(&priv->lock);
1282 spin_unlock_irq(&priv->tx_lock);
1285 static void ipoib_cm_skb_reap(struct work_struct *work)
1287 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1289 struct sk_buff *skb;
1291 unsigned mtu = priv->mcast_mtu;
1293 spin_lock_irq(&priv->tx_lock);
1294 spin_lock(&priv->lock);
1295 while ((skb = skb_dequeue(&priv->cm.skb_queue))) {
1296 spin_unlock(&priv->lock);
1297 spin_unlock_irq(&priv->tx_lock);
1298 if (skb->protocol == htons(ETH_P_IP))
1299 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu));
1300 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1301 else if (skb->protocol == htons(ETH_P_IPV6))
1302 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, priv->dev);
1304 dev_kfree_skb_any(skb);
1305 spin_lock_irq(&priv->tx_lock);
1306 spin_lock(&priv->lock);
1308 spin_unlock(&priv->lock);
1309 spin_unlock_irq(&priv->tx_lock);
1312 void ipoib_cm_skb_too_long(struct net_device *dev, struct sk_buff *skb,
1315 struct ipoib_dev_priv *priv = netdev_priv(dev);
1316 int e = skb_queue_empty(&priv->cm.skb_queue);
1319 skb->dst->ops->update_pmtu(skb->dst, mtu);
1321 skb_queue_tail(&priv->cm.skb_queue, skb);
1323 queue_work(ipoib_workqueue, &priv->cm.skb_task);
1326 static void ipoib_cm_rx_reap(struct work_struct *work)
1328 ipoib_cm_free_rx_reap_list(container_of(work, struct ipoib_dev_priv,
1329 cm.rx_reap_task)->dev);
1332 static void ipoib_cm_stale_task(struct work_struct *work)
1334 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1335 cm.stale_task.work);
1336 struct ipoib_cm_rx *p;
1339 spin_lock_irq(&priv->lock);
1340 while (!list_empty(&priv->cm.passive_ids)) {
1341 /* List is sorted by LRU, start from tail,
1342 * stop when we see a recently used entry */
1343 p = list_entry(priv->cm.passive_ids.prev, typeof(*p), list);
1344 if (time_before_eq(jiffies, p->jiffies + IPOIB_CM_RX_TIMEOUT))
1346 list_move(&p->list, &priv->cm.rx_error_list);
1347 p->state = IPOIB_CM_RX_ERROR;
1348 spin_unlock_irq(&priv->lock);
1349 ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE);
1351 ipoib_warn(priv, "unable to move qp to error state: %d\n", ret);
1352 spin_lock_irq(&priv->lock);
1355 if (!list_empty(&priv->cm.passive_ids))
1356 queue_delayed_work(ipoib_workqueue,
1357 &priv->cm.stale_task, IPOIB_CM_RX_DELAY);
1358 spin_unlock_irq(&priv->lock);
1362 static ssize_t show_mode(struct device *d, struct device_attribute *attr,
1365 struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(d));
1367 if (test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags))
1368 return sprintf(buf, "connected\n");
1370 return sprintf(buf, "datagram\n");
1373 static ssize_t set_mode(struct device *d, struct device_attribute *attr,
1374 const char *buf, size_t count)
1376 struct net_device *dev = to_net_dev(d);
1377 struct ipoib_dev_priv *priv = netdev_priv(dev);
1379 /* flush paths if we switch modes so that connections are restarted */
1380 if (IPOIB_CM_SUPPORTED(dev->dev_addr) && !strcmp(buf, "connected\n")) {
1381 set_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags);
1382 ipoib_warn(priv, "enabling connected mode "
1383 "will cause multicast packet drops\n");
1385 dev->features &= ~(NETIF_F_IP_CSUM | NETIF_F_SG | NETIF_F_TSO);
1386 priv->tx_wr.send_flags &= ~IB_SEND_IP_CSUM;
1388 ipoib_flush_paths(dev);
1392 if (!strcmp(buf, "datagram\n")) {
1393 clear_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags);
1394 dev->mtu = min(priv->mcast_mtu, dev->mtu);
1395 ipoib_flush_paths(dev);
1397 if (test_bit(IPOIB_FLAG_CSUM, &priv->flags)) {
1398 dev->features |= NETIF_F_IP_CSUM | NETIF_F_SG;
1399 if (priv->hca_caps & IB_DEVICE_UD_TSO)
1400 dev->features |= NETIF_F_TSO;
1409 static DEVICE_ATTR(mode, S_IWUSR | S_IRUGO, show_mode, set_mode);
1411 int ipoib_cm_add_mode_attr(struct net_device *dev)
1413 return device_create_file(&dev->dev, &dev_attr_mode);
1416 static void ipoib_cm_create_srq(struct net_device *dev, int max_sge)
1418 struct ipoib_dev_priv *priv = netdev_priv(dev);
1419 struct ib_srq_init_attr srq_init_attr = {
1421 .max_wr = ipoib_recvq_size,
1426 priv->cm.srq = ib_create_srq(priv->pd, &srq_init_attr);
1427 if (IS_ERR(priv->cm.srq)) {
1428 if (PTR_ERR(priv->cm.srq) != -ENOSYS)
1429 printk(KERN_WARNING "%s: failed to allocate SRQ, error %ld\n",
1430 priv->ca->name, PTR_ERR(priv->cm.srq));
1431 priv->cm.srq = NULL;
1435 priv->cm.srq_ring = kzalloc(ipoib_recvq_size * sizeof *priv->cm.srq_ring,
1437 if (!priv->cm.srq_ring) {
1438 printk(KERN_WARNING "%s: failed to allocate CM SRQ ring (%d entries)\n",
1439 priv->ca->name, ipoib_recvq_size);
1440 ib_destroy_srq(priv->cm.srq);
1441 priv->cm.srq = NULL;
1445 int ipoib_cm_dev_init(struct net_device *dev)
1447 struct ipoib_dev_priv *priv = netdev_priv(dev);
1449 struct ib_device_attr attr;
1451 INIT_LIST_HEAD(&priv->cm.passive_ids);
1452 INIT_LIST_HEAD(&priv->cm.reap_list);
1453 INIT_LIST_HEAD(&priv->cm.start_list);
1454 INIT_LIST_HEAD(&priv->cm.rx_error_list);
1455 INIT_LIST_HEAD(&priv->cm.rx_flush_list);
1456 INIT_LIST_HEAD(&priv->cm.rx_drain_list);
1457 INIT_LIST_HEAD(&priv->cm.rx_reap_list);
1458 INIT_WORK(&priv->cm.start_task, ipoib_cm_tx_start);
1459 INIT_WORK(&priv->cm.reap_task, ipoib_cm_tx_reap);
1460 INIT_WORK(&priv->cm.skb_task, ipoib_cm_skb_reap);
1461 INIT_WORK(&priv->cm.rx_reap_task, ipoib_cm_rx_reap);
1462 INIT_DELAYED_WORK(&priv->cm.stale_task, ipoib_cm_stale_task);
1464 skb_queue_head_init(&priv->cm.skb_queue);
1466 ret = ib_query_device(priv->ca, &attr);
1468 printk(KERN_WARNING "ib_query_device() failed with %d\n", ret);
1472 ipoib_dbg(priv, "max_srq_sge=%d\n", attr.max_srq_sge);
1474 attr.max_srq_sge = min_t(int, IPOIB_CM_RX_SG, attr.max_srq_sge);
1475 ipoib_cm_create_srq(dev, attr.max_srq_sge);
1476 if (ipoib_cm_has_srq(dev)) {
1477 priv->cm.max_cm_mtu = attr.max_srq_sge * PAGE_SIZE - 0x10;
1478 priv->cm.num_frags = attr.max_srq_sge;
1479 ipoib_dbg(priv, "max_cm_mtu = 0x%x, num_frags=%d\n",
1480 priv->cm.max_cm_mtu, priv->cm.num_frags);
1482 priv->cm.max_cm_mtu = IPOIB_CM_MTU;
1483 priv->cm.num_frags = IPOIB_CM_RX_SG;
1486 for (i = 0; i < priv->cm.num_frags; ++i)
1487 priv->cm.rx_sge[i].lkey = priv->mr->lkey;
1489 priv->cm.rx_sge[0].length = IPOIB_CM_HEAD_SIZE;
1490 for (i = 1; i < priv->cm.num_frags; ++i)
1491 priv->cm.rx_sge[i].length = PAGE_SIZE;
1492 priv->cm.rx_wr.next = NULL;
1493 priv->cm.rx_wr.sg_list = priv->cm.rx_sge;
1494 priv->cm.rx_wr.num_sge = priv->cm.num_frags;
1496 if (ipoib_cm_has_srq(dev)) {
1497 for (i = 0; i < ipoib_recvq_size; ++i) {
1498 if (!ipoib_cm_alloc_rx_skb(dev, priv->cm.srq_ring, i,
1499 priv->cm.num_frags - 1,
1500 priv->cm.srq_ring[i].mapping)) {
1501 ipoib_warn(priv, "failed to allocate "
1502 "receive buffer %d\n", i);
1503 ipoib_cm_dev_cleanup(dev);
1507 if (ipoib_cm_post_receive_srq(dev, i)) {
1508 ipoib_warn(priv, "ipoib_cm_post_receive_srq "
1509 "failed for buf %d\n", i);
1510 ipoib_cm_dev_cleanup(dev);
1516 priv->dev->dev_addr[0] = IPOIB_FLAGS_RC;
1520 void ipoib_cm_dev_cleanup(struct net_device *dev)
1522 struct ipoib_dev_priv *priv = netdev_priv(dev);
1528 ipoib_dbg(priv, "Cleanup ipoib connected mode.\n");
1530 ret = ib_destroy_srq(priv->cm.srq);
1532 ipoib_warn(priv, "ib_destroy_srq failed: %d\n", ret);
1534 priv->cm.srq = NULL;
1535 if (!priv->cm.srq_ring)
1538 ipoib_cm_free_rx_ring(dev, priv->cm.srq_ring);
1539 priv->cm.srq_ring = NULL;