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>
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,
115 struct ib_recv_wr *wr,
116 struct ib_sge *sge, int id)
118 struct ipoib_dev_priv *priv = netdev_priv(dev);
119 struct ib_recv_wr *bad_wr;
122 wr->wr_id = id | IPOIB_OP_CM | IPOIB_OP_RECV;
124 for (i = 0; i < IPOIB_CM_RX_SG; ++i)
125 sge[i].addr = rx->rx_ring[id].mapping[i];
127 ret = ib_post_recv(rx->qp, wr, &bad_wr);
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;
139 static struct sk_buff *ipoib_cm_alloc_rx_skb(struct net_device *dev,
140 struct ipoib_cm_rx_buf *rx_ring,
142 u64 mapping[IPOIB_CM_RX_SG])
144 struct ipoib_dev_priv *priv = netdev_priv(dev);
148 skb = dev_alloc_skb(IPOIB_CM_HEAD_SIZE + 12);
153 * IPoIB adds a 4 byte header. So we need 12 more bytes to align the
154 * IP header to a multiple of 16.
156 skb_reserve(skb, 12);
158 mapping[0] = ib_dma_map_single(priv->ca, skb->data, IPOIB_CM_HEAD_SIZE,
160 if (unlikely(ib_dma_mapping_error(priv->ca, mapping[0]))) {
161 dev_kfree_skb_any(skb);
165 for (i = 0; i < frags; i++) {
166 struct page *page = alloc_page(GFP_ATOMIC);
170 skb_fill_page_desc(skb, i, page, 0, PAGE_SIZE);
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])))
178 rx_ring[id].skb = skb;
183 ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_CM_HEAD_SIZE, DMA_FROM_DEVICE);
186 ib_dma_unmap_single(priv->ca, mapping[i], PAGE_SIZE, DMA_FROM_DEVICE);
188 dev_kfree_skb_any(skb);
192 static void ipoib_cm_free_rx_ring(struct net_device *dev,
193 struct ipoib_cm_rx_buf *rx_ring)
195 struct ipoib_dev_priv *priv = netdev_priv(dev);
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,
202 dev_kfree_skb_any(rx_ring[i].skb);
208 static void ipoib_cm_start_rx_drain(struct ipoib_dev_priv *priv)
210 struct ib_send_wr *bad_wr;
211 struct ipoib_cm_rx *p;
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))
220 * QPs on flush list are error state. This way, a "flush
221 * error" WC will be immediately generated for each WR we post.
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");
227 list_splice_init(&priv->cm.rx_flush_list, &priv->cm.rx_drain_list);
230 static void ipoib_cm_rx_event_handler(struct ib_event *event, void *ctx)
232 struct ipoib_cm_rx *p = ctx;
233 struct ipoib_dev_priv *priv = netdev_priv(p->dev);
236 if (event->event != IB_EVENT_QP_LAST_WQE_REACHED)
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);
246 static struct ib_qp *ipoib_cm_create_rx_qp(struct net_device *dev,
247 struct ipoib_cm_rx *p)
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,
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,
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;
267 return ib_create_qp(priv->pd, &attr);
270 static int ipoib_cm_modify_rx_qp(struct net_device *dev,
271 struct ib_cm_id *cm_id, struct ib_qp *qp,
274 struct ipoib_dev_priv *priv = netdev_priv(dev);
275 struct ib_qp_attr qp_attr;
276 int qp_attr_mask, ret;
278 qp_attr.qp_state = IB_QPS_INIT;
279 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
281 ipoib_warn(priv, "failed to init QP attr for INIT: %d\n", ret);
284 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
286 ipoib_warn(priv, "failed to modify QP to INIT: %d\n", ret);
289 qp_attr.qp_state = IB_QPS_RTR;
290 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
292 ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret);
295 qp_attr.rq_psn = psn;
296 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
298 ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret);
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
310 qp_attr.qp_state = IB_QPS_RTS;
311 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
313 ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret);
316 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
318 ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret);
325 static void ipoib_cm_init_rx_wr(struct net_device *dev,
326 struct ib_recv_wr *wr,
329 struct ipoib_dev_priv *priv = netdev_priv(dev);
332 for (i = 0; i < priv->cm.num_frags; ++i)
333 sge[i].lkey = priv->mr->lkey;
335 sge[0].length = IPOIB_CM_HEAD_SIZE;
336 for (i = 1; i < priv->cm.num_frags; ++i)
337 sge[i].length = PAGE_SIZE;
341 wr->num_sge = priv->cm.num_frags;
344 static int ipoib_cm_nonsrq_init_rx(struct net_device *dev, struct ib_cm_id *cm_id,
345 struct ipoib_cm_rx *rx)
347 struct ipoib_dev_priv *priv = netdev_priv(dev);
349 struct ib_recv_wr wr;
350 struct ib_sge sge[IPOIB_CM_RX_SG];
355 rx->rx_ring = vzalloc(ipoib_recvq_size * sizeof *rx->rx_ring);
357 printk(KERN_WARNING "%s: failed to allocate CM non-SRQ ring (%d entries)\n",
358 priv->ca->name, ipoib_recvq_size);
362 t = kmalloc(sizeof *t, GFP_KERNEL);
368 ipoib_cm_init_rx_wr(dev, &t->wr, t->sge);
370 spin_lock_irq(&priv->lock);
372 if (priv->cm.nonsrq_conn_qp >= ipoib_max_conn_qp) {
373 spin_unlock_irq(&priv->lock);
374 ib_send_cm_rej(cm_id, IB_CM_REJ_NO_QP, NULL, 0, NULL, 0);
378 ++priv->cm.nonsrq_conn_qp;
380 spin_unlock_irq(&priv->lock);
382 for (i = 0; i < ipoib_recvq_size; ++i) {
383 if (!ipoib_cm_alloc_rx_skb(dev, rx->rx_ring, i, IPOIB_CM_RX_SG - 1,
384 rx->rx_ring[i].mapping)) {
385 ipoib_warn(priv, "failed to allocate receive buffer %d\n", i);
389 ret = ipoib_cm_post_receive_nonsrq(dev, rx, &t->wr, t->sge, i);
391 ipoib_warn(priv, "ipoib_cm_post_receive_nonsrq "
392 "failed for buf %d\n", i);
398 rx->recv_count = ipoib_recvq_size;
405 spin_lock_irq(&priv->lock);
406 --priv->cm.nonsrq_conn_qp;
407 spin_unlock_irq(&priv->lock);
411 ipoib_cm_free_rx_ring(dev, rx->rx_ring);
416 static int ipoib_cm_send_rep(struct net_device *dev, struct ib_cm_id *cm_id,
417 struct ib_qp *qp, struct ib_cm_req_event_param *req,
420 struct ipoib_dev_priv *priv = netdev_priv(dev);
421 struct ipoib_cm_data data = {};
422 struct ib_cm_rep_param rep = {};
424 data.qpn = cpu_to_be32(priv->qp->qp_num);
425 data.mtu = cpu_to_be32(IPOIB_CM_BUF_SIZE);
427 rep.private_data = &data;
428 rep.private_data_len = sizeof data;
429 rep.flow_control = 0;
430 rep.rnr_retry_count = req->rnr_retry_count;
431 rep.srq = ipoib_cm_has_srq(dev);
432 rep.qp_num = qp->qp_num;
433 rep.starting_psn = psn;
434 return ib_send_cm_rep(cm_id, &rep);
437 static int ipoib_cm_req_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
439 struct net_device *dev = cm_id->context;
440 struct ipoib_dev_priv *priv = netdev_priv(dev);
441 struct ipoib_cm_rx *p;
445 ipoib_dbg(priv, "REQ arrived\n");
446 p = kzalloc(sizeof *p, GFP_KERNEL);
452 p->state = IPOIB_CM_RX_LIVE;
453 p->jiffies = jiffies;
454 INIT_LIST_HEAD(&p->list);
456 p->qp = ipoib_cm_create_rx_qp(dev, p);
458 ret = PTR_ERR(p->qp);
462 psn = random32() & 0xffffff;
463 ret = ipoib_cm_modify_rx_qp(dev, cm_id, p->qp, psn);
467 if (!ipoib_cm_has_srq(dev)) {
468 ret = ipoib_cm_nonsrq_init_rx(dev, cm_id, p);
473 spin_lock_irq(&priv->lock);
474 queue_delayed_work(ipoib_workqueue,
475 &priv->cm.stale_task, IPOIB_CM_RX_DELAY);
476 /* Add this entry to passive ids list head, but do not re-add it
477 * if IB_EVENT_QP_LAST_WQE_REACHED has moved it to flush list. */
478 p->jiffies = jiffies;
479 if (p->state == IPOIB_CM_RX_LIVE)
480 list_move(&p->list, &priv->cm.passive_ids);
481 spin_unlock_irq(&priv->lock);
483 ret = ipoib_cm_send_rep(dev, cm_id, p->qp, &event->param.req_rcvd, psn);
485 ipoib_warn(priv, "failed to send REP: %d\n", ret);
486 if (ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE))
487 ipoib_warn(priv, "unable to move qp to error state\n");
492 ib_destroy_qp(p->qp);
498 static int ipoib_cm_rx_handler(struct ib_cm_id *cm_id,
499 struct ib_cm_event *event)
501 struct ipoib_cm_rx *p;
502 struct ipoib_dev_priv *priv;
504 switch (event->event) {
505 case IB_CM_REQ_RECEIVED:
506 return ipoib_cm_req_handler(cm_id, event);
507 case IB_CM_DREQ_RECEIVED:
509 ib_send_cm_drep(cm_id, NULL, 0);
511 case IB_CM_REJ_RECEIVED:
513 priv = netdev_priv(p->dev);
514 if (ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE))
515 ipoib_warn(priv, "unable to move qp to error state\n");
521 /* Adjust length of skb with fragments to match received data */
522 static void skb_put_frags(struct sk_buff *skb, unsigned int hdr_space,
523 unsigned int length, struct sk_buff *toskb)
528 /* put header into skb */
529 size = min(length, hdr_space);
534 num_frags = skb_shinfo(skb)->nr_frags;
535 for (i = 0; i < num_frags; i++) {
536 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
539 /* don't need this page */
540 skb_fill_page_desc(toskb, i, frag->page, 0, PAGE_SIZE);
541 --skb_shinfo(skb)->nr_frags;
543 size = min(length, (unsigned) PAGE_SIZE);
546 skb->data_len += size;
547 skb->truesize += size;
554 void ipoib_cm_handle_rx_wc(struct net_device *dev, struct ib_wc *wc)
556 struct ipoib_dev_priv *priv = netdev_priv(dev);
557 struct ipoib_cm_rx_buf *rx_ring;
558 unsigned int wr_id = wc->wr_id & ~(IPOIB_OP_CM | IPOIB_OP_RECV);
559 struct sk_buff *skb, *newskb;
560 struct ipoib_cm_rx *p;
562 u64 mapping[IPOIB_CM_RX_SG];
565 struct sk_buff *small_skb;
567 ipoib_dbg_data(priv, "cm recv completion: id %d, status: %d\n",
570 if (unlikely(wr_id >= ipoib_recvq_size)) {
571 if (wr_id == (IPOIB_CM_RX_DRAIN_WRID & ~(IPOIB_OP_CM | IPOIB_OP_RECV))) {
572 spin_lock_irqsave(&priv->lock, flags);
573 list_splice_init(&priv->cm.rx_drain_list, &priv->cm.rx_reap_list);
574 ipoib_cm_start_rx_drain(priv);
575 queue_work(ipoib_workqueue, &priv->cm.rx_reap_task);
576 spin_unlock_irqrestore(&priv->lock, flags);
578 ipoib_warn(priv, "cm recv completion event with wrid %d (> %d)\n",
579 wr_id, ipoib_recvq_size);
583 p = wc->qp->qp_context;
585 has_srq = ipoib_cm_has_srq(dev);
586 rx_ring = has_srq ? priv->cm.srq_ring : p->rx_ring;
588 skb = rx_ring[wr_id].skb;
590 if (unlikely(wc->status != IB_WC_SUCCESS)) {
591 ipoib_dbg(priv, "cm recv error "
592 "(status=%d, wrid=%d vend_err %x)\n",
593 wc->status, wr_id, wc->vendor_err);
594 ++dev->stats.rx_dropped;
598 if (!--p->recv_count) {
599 spin_lock_irqsave(&priv->lock, flags);
600 list_move(&p->list, &priv->cm.rx_reap_list);
601 spin_unlock_irqrestore(&priv->lock, flags);
602 queue_work(ipoib_workqueue, &priv->cm.rx_reap_task);
608 if (unlikely(!(wr_id & IPOIB_CM_RX_UPDATE_MASK))) {
609 if (p && time_after_eq(jiffies, p->jiffies + IPOIB_CM_RX_UPDATE_TIME)) {
610 spin_lock_irqsave(&priv->lock, flags);
611 p->jiffies = jiffies;
612 /* Move this entry to list head, but do not re-add it
613 * if it has been moved out of list. */
614 if (p->state == IPOIB_CM_RX_LIVE)
615 list_move(&p->list, &priv->cm.passive_ids);
616 spin_unlock_irqrestore(&priv->lock, flags);
620 if (wc->byte_len < IPOIB_CM_COPYBREAK) {
621 int dlen = wc->byte_len;
623 small_skb = dev_alloc_skb(dlen + 12);
625 skb_reserve(small_skb, 12);
626 ib_dma_sync_single_for_cpu(priv->ca, rx_ring[wr_id].mapping[0],
627 dlen, DMA_FROM_DEVICE);
628 skb_copy_from_linear_data(skb, small_skb->data, dlen);
629 ib_dma_sync_single_for_device(priv->ca, rx_ring[wr_id].mapping[0],
630 dlen, DMA_FROM_DEVICE);
631 skb_put(small_skb, dlen);
637 frags = PAGE_ALIGN(wc->byte_len - min(wc->byte_len,
638 (unsigned)IPOIB_CM_HEAD_SIZE)) / PAGE_SIZE;
640 newskb = ipoib_cm_alloc_rx_skb(dev, rx_ring, wr_id, frags, mapping);
641 if (unlikely(!newskb)) {
643 * If we can't allocate a new RX buffer, dump
644 * this packet and reuse the old buffer.
646 ipoib_dbg(priv, "failed to allocate receive buffer %d\n", wr_id);
647 ++dev->stats.rx_dropped;
651 ipoib_cm_dma_unmap_rx(priv, frags, rx_ring[wr_id].mapping);
652 memcpy(rx_ring[wr_id].mapping, mapping, (frags + 1) * sizeof *mapping);
654 ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n",
655 wc->byte_len, wc->slid);
657 skb_put_frags(skb, IPOIB_CM_HEAD_SIZE, wc->byte_len, newskb);
660 skb->protocol = ((struct ipoib_header *) skb->data)->proto;
661 skb_reset_mac_header(skb);
662 skb_pull(skb, IPOIB_ENCAP_LEN);
664 ++dev->stats.rx_packets;
665 dev->stats.rx_bytes += skb->len;
668 /* XXX get correct PACKET_ type here */
669 skb->pkt_type = PACKET_HOST;
670 netif_receive_skb(skb);
674 if (unlikely(ipoib_cm_post_receive_srq(dev, wr_id)))
675 ipoib_warn(priv, "ipoib_cm_post_receive_srq failed "
676 "for buf %d\n", wr_id);
678 if (unlikely(ipoib_cm_post_receive_nonsrq(dev, p,
683 ipoib_warn(priv, "ipoib_cm_post_receive_nonsrq failed "
684 "for buf %d\n", wr_id);
689 static inline int post_send(struct ipoib_dev_priv *priv,
690 struct ipoib_cm_tx *tx,
694 struct ib_send_wr *bad_wr;
696 priv->tx_sge[0].addr = addr;
697 priv->tx_sge[0].length = len;
699 priv->tx_wr.num_sge = 1;
700 priv->tx_wr.wr_id = wr_id | IPOIB_OP_CM;
702 return ib_post_send(tx->qp, &priv->tx_wr, &bad_wr);
705 void ipoib_cm_send(struct net_device *dev, struct sk_buff *skb, struct ipoib_cm_tx *tx)
707 struct ipoib_dev_priv *priv = netdev_priv(dev);
708 struct ipoib_cm_tx_buf *tx_req;
712 if (unlikely(skb->len > tx->mtu)) {
713 ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n",
715 ++dev->stats.tx_dropped;
716 ++dev->stats.tx_errors;
717 ipoib_cm_skb_too_long(dev, skb, tx->mtu - IPOIB_ENCAP_LEN);
721 ipoib_dbg_data(priv, "sending packet: head 0x%x length %d connection 0x%x\n",
722 tx->tx_head, skb->len, tx->qp->qp_num);
725 * We put the skb into the tx_ring _before_ we call post_send()
726 * because it's entirely possible that the completion handler will
727 * run before we execute anything after the post_send(). That
728 * means we have to make sure everything is properly recorded and
729 * our state is consistent before we call post_send().
731 tx_req = &tx->tx_ring[tx->tx_head & (ipoib_sendq_size - 1)];
733 addr = ib_dma_map_single(priv->ca, skb->data, skb->len, DMA_TO_DEVICE);
734 if (unlikely(ib_dma_mapping_error(priv->ca, addr))) {
735 ++dev->stats.tx_errors;
736 dev_kfree_skb_any(skb);
740 tx_req->mapping = addr;
742 rc = post_send(priv, tx, tx->tx_head & (ipoib_sendq_size - 1),
745 ipoib_warn(priv, "post_send failed, error %d\n", rc);
746 ++dev->stats.tx_errors;
747 ib_dma_unmap_single(priv->ca, addr, skb->len, DMA_TO_DEVICE);
748 dev_kfree_skb_any(skb);
750 dev->trans_start = jiffies;
753 if (++priv->tx_outstanding == ipoib_sendq_size) {
754 ipoib_dbg(priv, "TX ring 0x%x full, stopping kernel net queue\n",
756 if (ib_req_notify_cq(priv->send_cq, IB_CQ_NEXT_COMP))
757 ipoib_warn(priv, "request notify on send CQ failed\n");
758 netif_stop_queue(dev);
763 void ipoib_cm_handle_tx_wc(struct net_device *dev, struct ib_wc *wc)
765 struct ipoib_dev_priv *priv = netdev_priv(dev);
766 struct ipoib_cm_tx *tx = wc->qp->qp_context;
767 unsigned int wr_id = wc->wr_id & ~IPOIB_OP_CM;
768 struct ipoib_cm_tx_buf *tx_req;
771 ipoib_dbg_data(priv, "cm send completion: id %d, status: %d\n",
774 if (unlikely(wr_id >= ipoib_sendq_size)) {
775 ipoib_warn(priv, "cm send completion event with wrid %d (> %d)\n",
776 wr_id, ipoib_sendq_size);
780 tx_req = &tx->tx_ring[wr_id];
782 ib_dma_unmap_single(priv->ca, tx_req->mapping, tx_req->skb->len, DMA_TO_DEVICE);
784 /* FIXME: is this right? Shouldn't we only increment on success? */
785 ++dev->stats.tx_packets;
786 dev->stats.tx_bytes += tx_req->skb->len;
788 dev_kfree_skb_any(tx_req->skb);
793 if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) &&
794 netif_queue_stopped(dev) &&
795 test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
796 netif_wake_queue(dev);
798 if (wc->status != IB_WC_SUCCESS &&
799 wc->status != IB_WC_WR_FLUSH_ERR) {
800 struct ipoib_neigh *neigh;
802 ipoib_dbg(priv, "failed cm send event "
803 "(status=%d, wrid=%d vend_err %x)\n",
804 wc->status, wr_id, wc->vendor_err);
806 spin_lock_irqsave(&priv->lock, flags);
811 list_del(&neigh->list);
813 ipoib_put_ah(neigh->ah);
814 ipoib_neigh_free(dev, neigh);
819 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
820 list_move(&tx->list, &priv->cm.reap_list);
821 queue_work(ipoib_workqueue, &priv->cm.reap_task);
824 clear_bit(IPOIB_FLAG_OPER_UP, &tx->flags);
826 spin_unlock_irqrestore(&priv->lock, flags);
829 netif_tx_unlock(dev);
832 int ipoib_cm_dev_open(struct net_device *dev)
834 struct ipoib_dev_priv *priv = netdev_priv(dev);
837 if (!IPOIB_CM_SUPPORTED(dev->dev_addr))
840 priv->cm.id = ib_create_cm_id(priv->ca, ipoib_cm_rx_handler, dev);
841 if (IS_ERR(priv->cm.id)) {
842 printk(KERN_WARNING "%s: failed to create CM ID\n", priv->ca->name);
843 ret = PTR_ERR(priv->cm.id);
847 ret = ib_cm_listen(priv->cm.id, cpu_to_be64(IPOIB_CM_IETF_ID | priv->qp->qp_num),
850 printk(KERN_WARNING "%s: failed to listen on ID 0x%llx\n", priv->ca->name,
851 IPOIB_CM_IETF_ID | priv->qp->qp_num);
858 ib_destroy_cm_id(priv->cm.id);
864 static void ipoib_cm_free_rx_reap_list(struct net_device *dev)
866 struct ipoib_dev_priv *priv = netdev_priv(dev);
867 struct ipoib_cm_rx *rx, *n;
870 spin_lock_irq(&priv->lock);
871 list_splice_init(&priv->cm.rx_reap_list, &list);
872 spin_unlock_irq(&priv->lock);
874 list_for_each_entry_safe(rx, n, &list, list) {
875 ib_destroy_cm_id(rx->id);
876 ib_destroy_qp(rx->qp);
877 if (!ipoib_cm_has_srq(dev)) {
878 ipoib_cm_free_rx_ring(priv->dev, rx->rx_ring);
879 spin_lock_irq(&priv->lock);
880 --priv->cm.nonsrq_conn_qp;
881 spin_unlock_irq(&priv->lock);
887 void ipoib_cm_dev_stop(struct net_device *dev)
889 struct ipoib_dev_priv *priv = netdev_priv(dev);
890 struct ipoib_cm_rx *p;
894 if (!IPOIB_CM_SUPPORTED(dev->dev_addr) || !priv->cm.id)
897 ib_destroy_cm_id(priv->cm.id);
900 spin_lock_irq(&priv->lock);
901 while (!list_empty(&priv->cm.passive_ids)) {
902 p = list_entry(priv->cm.passive_ids.next, typeof(*p), list);
903 list_move(&p->list, &priv->cm.rx_error_list);
904 p->state = IPOIB_CM_RX_ERROR;
905 spin_unlock_irq(&priv->lock);
906 ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE);
908 ipoib_warn(priv, "unable to move qp to error state: %d\n", ret);
909 spin_lock_irq(&priv->lock);
912 /* Wait for all RX to be drained */
915 while (!list_empty(&priv->cm.rx_error_list) ||
916 !list_empty(&priv->cm.rx_flush_list) ||
917 !list_empty(&priv->cm.rx_drain_list)) {
918 if (time_after(jiffies, begin + 5 * HZ)) {
919 ipoib_warn(priv, "RX drain timing out\n");
922 * assume the HW is wedged and just free up everything.
924 list_splice_init(&priv->cm.rx_flush_list,
925 &priv->cm.rx_reap_list);
926 list_splice_init(&priv->cm.rx_error_list,
927 &priv->cm.rx_reap_list);
928 list_splice_init(&priv->cm.rx_drain_list,
929 &priv->cm.rx_reap_list);
932 spin_unlock_irq(&priv->lock);
935 spin_lock_irq(&priv->lock);
938 spin_unlock_irq(&priv->lock);
940 ipoib_cm_free_rx_reap_list(dev);
942 cancel_delayed_work(&priv->cm.stale_task);
945 static int ipoib_cm_rep_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
947 struct ipoib_cm_tx *p = cm_id->context;
948 struct ipoib_dev_priv *priv = netdev_priv(p->dev);
949 struct ipoib_cm_data *data = event->private_data;
950 struct sk_buff_head skqueue;
951 struct ib_qp_attr qp_attr;
952 int qp_attr_mask, ret;
955 p->mtu = be32_to_cpu(data->mtu);
957 if (p->mtu <= IPOIB_ENCAP_LEN) {
958 ipoib_warn(priv, "Rejecting connection: mtu %d <= %d\n",
959 p->mtu, IPOIB_ENCAP_LEN);
963 qp_attr.qp_state = IB_QPS_RTR;
964 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
966 ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret);
970 qp_attr.rq_psn = 0 /* FIXME */;
971 ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask);
973 ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret);
977 qp_attr.qp_state = IB_QPS_RTS;
978 ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
980 ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret);
983 ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask);
985 ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret);
989 skb_queue_head_init(&skqueue);
991 spin_lock_irq(&priv->lock);
992 set_bit(IPOIB_FLAG_OPER_UP, &p->flags);
994 while ((skb = __skb_dequeue(&p->neigh->queue)))
995 __skb_queue_tail(&skqueue, skb);
996 spin_unlock_irq(&priv->lock);
998 while ((skb = __skb_dequeue(&skqueue))) {
1000 if (dev_queue_xmit(skb))
1001 ipoib_warn(priv, "dev_queue_xmit failed "
1002 "to requeue packet\n");
1005 ret = ib_send_cm_rtu(cm_id, NULL, 0);
1007 ipoib_warn(priv, "failed to send RTU: %d\n", ret);
1013 static struct ib_qp *ipoib_cm_create_tx_qp(struct net_device *dev, struct ipoib_cm_tx *tx)
1015 struct ipoib_dev_priv *priv = netdev_priv(dev);
1016 struct ib_qp_init_attr attr = {
1017 .send_cq = priv->recv_cq,
1018 .recv_cq = priv->recv_cq,
1019 .srq = priv->cm.srq,
1020 .cap.max_send_wr = ipoib_sendq_size,
1021 .cap.max_send_sge = 1,
1022 .sq_sig_type = IB_SIGNAL_ALL_WR,
1023 .qp_type = IB_QPT_RC,
1027 return ib_create_qp(priv->pd, &attr);
1030 static int ipoib_cm_send_req(struct net_device *dev,
1031 struct ib_cm_id *id, struct ib_qp *qp,
1033 struct ib_sa_path_rec *pathrec)
1035 struct ipoib_dev_priv *priv = netdev_priv(dev);
1036 struct ipoib_cm_data data = {};
1037 struct ib_cm_req_param req = {};
1039 data.qpn = cpu_to_be32(priv->qp->qp_num);
1040 data.mtu = cpu_to_be32(IPOIB_CM_BUF_SIZE);
1042 req.primary_path = pathrec;
1043 req.alternate_path = NULL;
1044 req.service_id = cpu_to_be64(IPOIB_CM_IETF_ID | qpn);
1045 req.qp_num = qp->qp_num;
1046 req.qp_type = qp->qp_type;
1047 req.private_data = &data;
1048 req.private_data_len = sizeof data;
1049 req.flow_control = 0;
1051 req.starting_psn = 0; /* FIXME */
1054 * Pick some arbitrary defaults here; we could make these
1055 * module parameters if anyone cared about setting them.
1057 req.responder_resources = 4;
1058 req.remote_cm_response_timeout = 20;
1059 req.local_cm_response_timeout = 20;
1060 req.retry_count = 0; /* RFC draft warns against retries */
1061 req.rnr_retry_count = 0; /* RFC draft warns against retries */
1062 req.max_cm_retries = 15;
1063 req.srq = ipoib_cm_has_srq(dev);
1064 return ib_send_cm_req(id, &req);
1067 static int ipoib_cm_modify_tx_init(struct net_device *dev,
1068 struct ib_cm_id *cm_id, struct ib_qp *qp)
1070 struct ipoib_dev_priv *priv = netdev_priv(dev);
1071 struct ib_qp_attr qp_attr;
1072 int qp_attr_mask, ret;
1073 ret = ib_find_pkey(priv->ca, priv->port, priv->pkey, &qp_attr.pkey_index);
1075 ipoib_warn(priv, "pkey 0x%x not found: %d\n", priv->pkey, ret);
1079 qp_attr.qp_state = IB_QPS_INIT;
1080 qp_attr.qp_access_flags = IB_ACCESS_LOCAL_WRITE;
1081 qp_attr.port_num = priv->port;
1082 qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS | IB_QP_PKEY_INDEX | IB_QP_PORT;
1084 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
1086 ipoib_warn(priv, "failed to modify tx QP to INIT: %d\n", ret);
1092 static int ipoib_cm_tx_init(struct ipoib_cm_tx *p, u32 qpn,
1093 struct ib_sa_path_rec *pathrec)
1095 struct ipoib_dev_priv *priv = netdev_priv(p->dev);
1098 p->tx_ring = vzalloc(ipoib_sendq_size * sizeof *p->tx_ring);
1100 ipoib_warn(priv, "failed to allocate tx ring\n");
1105 p->qp = ipoib_cm_create_tx_qp(p->dev, p);
1106 if (IS_ERR(p->qp)) {
1107 ret = PTR_ERR(p->qp);
1108 ipoib_warn(priv, "failed to allocate tx qp: %d\n", ret);
1112 p->id = ib_create_cm_id(priv->ca, ipoib_cm_tx_handler, p);
1113 if (IS_ERR(p->id)) {
1114 ret = PTR_ERR(p->id);
1115 ipoib_warn(priv, "failed to create tx cm id: %d\n", ret);
1119 ret = ipoib_cm_modify_tx_init(p->dev, p->id, p->qp);
1121 ipoib_warn(priv, "failed to modify tx qp to rtr: %d\n", ret);
1125 ret = ipoib_cm_send_req(p->dev, p->id, p->qp, qpn, pathrec);
1127 ipoib_warn(priv, "failed to send cm req: %d\n", ret);
1131 ipoib_dbg(priv, "Request connection 0x%x for gid %pI6 qpn 0x%x\n",
1132 p->qp->qp_num, pathrec->dgid.raw, qpn);
1138 ib_destroy_cm_id(p->id);
1141 ib_destroy_qp(p->qp);
1149 static void ipoib_cm_tx_destroy(struct ipoib_cm_tx *p)
1151 struct ipoib_dev_priv *priv = netdev_priv(p->dev);
1152 struct ipoib_cm_tx_buf *tx_req;
1153 unsigned long begin;
1155 ipoib_dbg(priv, "Destroy active connection 0x%x head 0x%x tail 0x%x\n",
1156 p->qp ? p->qp->qp_num : 0, p->tx_head, p->tx_tail);
1159 ib_destroy_cm_id(p->id);
1162 /* Wait for all sends to complete */
1164 while ((int) p->tx_tail - (int) p->tx_head < 0) {
1165 if (time_after(jiffies, begin + 5 * HZ)) {
1166 ipoib_warn(priv, "timing out; %d sends not completed\n",
1167 p->tx_head - p->tx_tail);
1177 while ((int) p->tx_tail - (int) p->tx_head < 0) {
1178 tx_req = &p->tx_ring[p->tx_tail & (ipoib_sendq_size - 1)];
1179 ib_dma_unmap_single(priv->ca, tx_req->mapping, tx_req->skb->len,
1181 dev_kfree_skb_any(tx_req->skb);
1183 netif_tx_lock_bh(p->dev);
1184 if (unlikely(--priv->tx_outstanding == ipoib_sendq_size >> 1) &&
1185 netif_queue_stopped(p->dev) &&
1186 test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
1187 netif_wake_queue(p->dev);
1188 netif_tx_unlock_bh(p->dev);
1192 ib_destroy_qp(p->qp);
1198 static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id,
1199 struct ib_cm_event *event)
1201 struct ipoib_cm_tx *tx = cm_id->context;
1202 struct ipoib_dev_priv *priv = netdev_priv(tx->dev);
1203 struct net_device *dev = priv->dev;
1204 struct ipoib_neigh *neigh;
1205 unsigned long flags;
1208 switch (event->event) {
1209 case IB_CM_DREQ_RECEIVED:
1210 ipoib_dbg(priv, "DREQ received.\n");
1211 ib_send_cm_drep(cm_id, NULL, 0);
1213 case IB_CM_REP_RECEIVED:
1214 ipoib_dbg(priv, "REP received.\n");
1215 ret = ipoib_cm_rep_handler(cm_id, event);
1217 ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
1220 case IB_CM_REQ_ERROR:
1221 case IB_CM_REJ_RECEIVED:
1222 case IB_CM_TIMEWAIT_EXIT:
1223 ipoib_dbg(priv, "CM error %d.\n", event->event);
1224 netif_tx_lock_bh(dev);
1225 spin_lock_irqsave(&priv->lock, flags);
1230 list_del(&neigh->list);
1232 ipoib_put_ah(neigh->ah);
1233 ipoib_neigh_free(dev, neigh);
1238 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
1239 list_move(&tx->list, &priv->cm.reap_list);
1240 queue_work(ipoib_workqueue, &priv->cm.reap_task);
1243 spin_unlock_irqrestore(&priv->lock, flags);
1244 netif_tx_unlock_bh(dev);
1253 struct ipoib_cm_tx *ipoib_cm_create_tx(struct net_device *dev, struct ipoib_path *path,
1254 struct ipoib_neigh *neigh)
1256 struct ipoib_dev_priv *priv = netdev_priv(dev);
1257 struct ipoib_cm_tx *tx;
1259 tx = kzalloc(sizeof *tx, GFP_ATOMIC);
1267 list_add(&tx->list, &priv->cm.start_list);
1268 set_bit(IPOIB_FLAG_INITIALIZED, &tx->flags);
1269 queue_work(ipoib_workqueue, &priv->cm.start_task);
1273 void ipoib_cm_destroy_tx(struct ipoib_cm_tx *tx)
1275 struct ipoib_dev_priv *priv = netdev_priv(tx->dev);
1276 if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
1277 list_move(&tx->list, &priv->cm.reap_list);
1278 queue_work(ipoib_workqueue, &priv->cm.reap_task);
1279 ipoib_dbg(priv, "Reap connection for gid %pI6\n",
1280 tx->neigh->dgid.raw);
1285 static void ipoib_cm_tx_start(struct work_struct *work)
1287 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1289 struct net_device *dev = priv->dev;
1290 struct ipoib_neigh *neigh;
1291 struct ipoib_cm_tx *p;
1292 unsigned long flags;
1295 struct ib_sa_path_rec pathrec;
1298 netif_tx_lock_bh(dev);
1299 spin_lock_irqsave(&priv->lock, flags);
1301 while (!list_empty(&priv->cm.start_list)) {
1302 p = list_entry(priv->cm.start_list.next, typeof(*p), list);
1303 list_del_init(&p->list);
1305 qpn = IPOIB_QPN(neigh->neighbour->ha);
1306 memcpy(&pathrec, &p->path->pathrec, sizeof pathrec);
1308 spin_unlock_irqrestore(&priv->lock, flags);
1309 netif_tx_unlock_bh(dev);
1311 ret = ipoib_cm_tx_init(p, qpn, &pathrec);
1313 netif_tx_lock_bh(dev);
1314 spin_lock_irqsave(&priv->lock, flags);
1320 list_del(&neigh->list);
1322 ipoib_put_ah(neigh->ah);
1323 ipoib_neigh_free(dev, neigh);
1330 spin_unlock_irqrestore(&priv->lock, flags);
1331 netif_tx_unlock_bh(dev);
1334 static void ipoib_cm_tx_reap(struct work_struct *work)
1336 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1338 struct net_device *dev = priv->dev;
1339 struct ipoib_cm_tx *p;
1340 unsigned long flags;
1342 netif_tx_lock_bh(dev);
1343 spin_lock_irqsave(&priv->lock, flags);
1345 while (!list_empty(&priv->cm.reap_list)) {
1346 p = list_entry(priv->cm.reap_list.next, typeof(*p), list);
1348 spin_unlock_irqrestore(&priv->lock, flags);
1349 netif_tx_unlock_bh(dev);
1350 ipoib_cm_tx_destroy(p);
1351 netif_tx_lock_bh(dev);
1352 spin_lock_irqsave(&priv->lock, flags);
1355 spin_unlock_irqrestore(&priv->lock, flags);
1356 netif_tx_unlock_bh(dev);
1359 static void ipoib_cm_skb_reap(struct work_struct *work)
1361 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1363 struct net_device *dev = priv->dev;
1364 struct sk_buff *skb;
1365 unsigned long flags;
1366 unsigned mtu = priv->mcast_mtu;
1368 netif_tx_lock_bh(dev);
1369 spin_lock_irqsave(&priv->lock, flags);
1371 while ((skb = skb_dequeue(&priv->cm.skb_queue))) {
1372 spin_unlock_irqrestore(&priv->lock, flags);
1373 netif_tx_unlock_bh(dev);
1375 if (skb->protocol == htons(ETH_P_IP))
1376 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu));
1377 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1378 else if (skb->protocol == htons(ETH_P_IPV6))
1379 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
1381 dev_kfree_skb_any(skb);
1383 netif_tx_lock_bh(dev);
1384 spin_lock_irqsave(&priv->lock, flags);
1387 spin_unlock_irqrestore(&priv->lock, flags);
1388 netif_tx_unlock_bh(dev);
1391 void ipoib_cm_skb_too_long(struct net_device *dev, struct sk_buff *skb,
1394 struct ipoib_dev_priv *priv = netdev_priv(dev);
1395 int e = skb_queue_empty(&priv->cm.skb_queue);
1398 skb_dst(skb)->ops->update_pmtu(skb_dst(skb), mtu);
1400 skb_queue_tail(&priv->cm.skb_queue, skb);
1402 queue_work(ipoib_workqueue, &priv->cm.skb_task);
1405 static void ipoib_cm_rx_reap(struct work_struct *work)
1407 ipoib_cm_free_rx_reap_list(container_of(work, struct ipoib_dev_priv,
1408 cm.rx_reap_task)->dev);
1411 static void ipoib_cm_stale_task(struct work_struct *work)
1413 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
1414 cm.stale_task.work);
1415 struct ipoib_cm_rx *p;
1418 spin_lock_irq(&priv->lock);
1419 while (!list_empty(&priv->cm.passive_ids)) {
1420 /* List is sorted by LRU, start from tail,
1421 * stop when we see a recently used entry */
1422 p = list_entry(priv->cm.passive_ids.prev, typeof(*p), list);
1423 if (time_before_eq(jiffies, p->jiffies + IPOIB_CM_RX_TIMEOUT))
1425 list_move(&p->list, &priv->cm.rx_error_list);
1426 p->state = IPOIB_CM_RX_ERROR;
1427 spin_unlock_irq(&priv->lock);
1428 ret = ib_modify_qp(p->qp, &ipoib_cm_err_attr, IB_QP_STATE);
1430 ipoib_warn(priv, "unable to move qp to error state: %d\n", ret);
1431 spin_lock_irq(&priv->lock);
1434 if (!list_empty(&priv->cm.passive_ids))
1435 queue_delayed_work(ipoib_workqueue,
1436 &priv->cm.stale_task, IPOIB_CM_RX_DELAY);
1437 spin_unlock_irq(&priv->lock);
1441 static ssize_t show_mode(struct device *d, struct device_attribute *attr,
1444 struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(d));
1446 if (test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags))
1447 return sprintf(buf, "connected\n");
1449 return sprintf(buf, "datagram\n");
1452 static ssize_t set_mode(struct device *d, struct device_attribute *attr,
1453 const char *buf, size_t count)
1455 struct net_device *dev = to_net_dev(d);
1456 struct ipoib_dev_priv *priv = netdev_priv(dev);
1458 if (!rtnl_trylock())
1459 return restart_syscall();
1461 /* flush paths if we switch modes so that connections are restarted */
1462 if (IPOIB_CM_SUPPORTED(dev->dev_addr) && !strcmp(buf, "connected\n")) {
1463 set_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags);
1464 ipoib_warn(priv, "enabling connected mode "
1465 "will cause multicast packet drops\n");
1467 dev->features &= ~(NETIF_F_IP_CSUM | NETIF_F_SG | NETIF_F_TSO);
1469 priv->tx_wr.send_flags &= ~IB_SEND_IP_CSUM;
1471 ipoib_flush_paths(dev);
1475 if (!strcmp(buf, "datagram\n")) {
1476 clear_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags);
1478 if (test_bit(IPOIB_FLAG_CSUM, &priv->flags)) {
1479 dev->features |= NETIF_F_IP_CSUM | NETIF_F_SG;
1480 priv->dev->features |= NETIF_F_GRO;
1481 if (priv->hca_caps & IB_DEVICE_UD_TSO)
1482 dev->features |= NETIF_F_TSO;
1484 dev_set_mtu(dev, min(priv->mcast_mtu, dev->mtu));
1486 ipoib_flush_paths(dev);
1495 static DEVICE_ATTR(mode, S_IWUSR | S_IRUGO, show_mode, set_mode);
1497 int ipoib_cm_add_mode_attr(struct net_device *dev)
1499 return device_create_file(&dev->dev, &dev_attr_mode);
1502 static void ipoib_cm_create_srq(struct net_device *dev, int max_sge)
1504 struct ipoib_dev_priv *priv = netdev_priv(dev);
1505 struct ib_srq_init_attr srq_init_attr = {
1507 .max_wr = ipoib_recvq_size,
1512 priv->cm.srq = ib_create_srq(priv->pd, &srq_init_attr);
1513 if (IS_ERR(priv->cm.srq)) {
1514 if (PTR_ERR(priv->cm.srq) != -ENOSYS)
1515 printk(KERN_WARNING "%s: failed to allocate SRQ, error %ld\n",
1516 priv->ca->name, PTR_ERR(priv->cm.srq));
1517 priv->cm.srq = NULL;
1521 priv->cm.srq_ring = vzalloc(ipoib_recvq_size * sizeof *priv->cm.srq_ring);
1522 if (!priv->cm.srq_ring) {
1523 printk(KERN_WARNING "%s: failed to allocate CM SRQ ring (%d entries)\n",
1524 priv->ca->name, ipoib_recvq_size);
1525 ib_destroy_srq(priv->cm.srq);
1526 priv->cm.srq = NULL;
1532 int ipoib_cm_dev_init(struct net_device *dev)
1534 struct ipoib_dev_priv *priv = netdev_priv(dev);
1536 struct ib_device_attr attr;
1538 INIT_LIST_HEAD(&priv->cm.passive_ids);
1539 INIT_LIST_HEAD(&priv->cm.reap_list);
1540 INIT_LIST_HEAD(&priv->cm.start_list);
1541 INIT_LIST_HEAD(&priv->cm.rx_error_list);
1542 INIT_LIST_HEAD(&priv->cm.rx_flush_list);
1543 INIT_LIST_HEAD(&priv->cm.rx_drain_list);
1544 INIT_LIST_HEAD(&priv->cm.rx_reap_list);
1545 INIT_WORK(&priv->cm.start_task, ipoib_cm_tx_start);
1546 INIT_WORK(&priv->cm.reap_task, ipoib_cm_tx_reap);
1547 INIT_WORK(&priv->cm.skb_task, ipoib_cm_skb_reap);
1548 INIT_WORK(&priv->cm.rx_reap_task, ipoib_cm_rx_reap);
1549 INIT_DELAYED_WORK(&priv->cm.stale_task, ipoib_cm_stale_task);
1551 skb_queue_head_init(&priv->cm.skb_queue);
1553 ret = ib_query_device(priv->ca, &attr);
1555 printk(KERN_WARNING "ib_query_device() failed with %d\n", ret);
1559 ipoib_dbg(priv, "max_srq_sge=%d\n", attr.max_srq_sge);
1561 attr.max_srq_sge = min_t(int, IPOIB_CM_RX_SG, attr.max_srq_sge);
1562 ipoib_cm_create_srq(dev, attr.max_srq_sge);
1563 if (ipoib_cm_has_srq(dev)) {
1564 priv->cm.max_cm_mtu = attr.max_srq_sge * PAGE_SIZE - 0x10;
1565 priv->cm.num_frags = attr.max_srq_sge;
1566 ipoib_dbg(priv, "max_cm_mtu = 0x%x, num_frags=%d\n",
1567 priv->cm.max_cm_mtu, priv->cm.num_frags);
1569 priv->cm.max_cm_mtu = IPOIB_CM_MTU;
1570 priv->cm.num_frags = IPOIB_CM_RX_SG;
1573 ipoib_cm_init_rx_wr(dev, &priv->cm.rx_wr, priv->cm.rx_sge);
1575 if (ipoib_cm_has_srq(dev)) {
1576 for (i = 0; i < ipoib_recvq_size; ++i) {
1577 if (!ipoib_cm_alloc_rx_skb(dev, priv->cm.srq_ring, i,
1578 priv->cm.num_frags - 1,
1579 priv->cm.srq_ring[i].mapping)) {
1580 ipoib_warn(priv, "failed to allocate "
1581 "receive buffer %d\n", i);
1582 ipoib_cm_dev_cleanup(dev);
1586 if (ipoib_cm_post_receive_srq(dev, i)) {
1587 ipoib_warn(priv, "ipoib_cm_post_receive_srq "
1588 "failed for buf %d\n", i);
1589 ipoib_cm_dev_cleanup(dev);
1595 priv->dev->dev_addr[0] = IPOIB_FLAGS_RC;
1599 void ipoib_cm_dev_cleanup(struct net_device *dev)
1601 struct ipoib_dev_priv *priv = netdev_priv(dev);
1607 ipoib_dbg(priv, "Cleanup ipoib connected mode.\n");
1609 ret = ib_destroy_srq(priv->cm.srq);
1611 ipoib_warn(priv, "ib_destroy_srq failed: %d\n", ret);
1613 priv->cm.srq = NULL;
1614 if (!priv->cm.srq_ring)
1617 ipoib_cm_free_rx_ring(dev, priv->cm.srq_ring);
1618 priv->cm.srq_ring = NULL;