Merge branch 'for-linus' of master.kernel.org:/pub/scm/linux/kernel/git/roland/infiniband

* 'for-linus' of master.kernel.org:/pub/scm/linux/kernel/git/roland/infiniband:
  IB/mthca: Always fill MTTs from CPU
  IB/mthca: Merge MR and FMR space on 64-bit systems
  IB/mthca: Fix access to MTT and MPT tables on non-cache-coherent CPUs
  IB/mthca: Give reserved MTTs a separate cache line
  IB/mthca: Fix reserved MTTs calculation on mem-free HCAs
  RDMA/cxgb3: Add driver for Chelsio T3 RNIC
  IB: Remove redundant "_wq" from workqueue names
  RDMA/cma: Increment port number after close to avoid re-use
  IB/ehca: Fix memleak on module unloading
  IB/mthca: Work around gcc bug on sparc64
  IPoIB: Connected mode experimental support
  IB/core: Use ARRAY_SIZE macro for mandatory_table
  IB/mthca: Use correct structure size in call to memset()

1 files changed, 1237 insertions, 0 deletions

diff --git a/drivers/infiniband/ulp/ipoib/ipoib_cm.c b/drivers/infiniband/ulp/ipoib/ipoib_cm.c
new file mode 100644
index 00000000000..2d483874a58
--- /dev/null
+++ b/drivers/infiniband/ulp/ipoib/ipoib_cm.c
@@ -0,0 +1,1237 @@
+/*
+ * Copyright (c) 2006 Mellanox Technologies. All rights reserved
+ *
+ * This software is available to you under a choice of one of two
+ * licenses.  You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ *     Redistribution and use in source and binary forms, with or
+ *     without modification, are permitted provided that the following
+ *     conditions are met:
+ *
+ *      - Redistributions of source code must retain the above
+ *        copyright notice, this list of conditions and the following
+ *        disclaimer.
+ *
+ *      - Redistributions in binary form must reproduce the above
+ *        copyright notice, this list of conditions and the following
+ *        disclaimer in the documentation and/or other materials
+ *        provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ * $Id$
+ */
+
+#include <rdma/ib_cm.h>
+#include <rdma/ib_cache.h>
+#include <net/dst.h>
+#include <net/icmp.h>
+#include <linux/icmpv6.h>
+
+#ifdef CONFIG_INFINIBAND_IPOIB_DEBUG_DATA
+static int data_debug_level;
+
+module_param_named(cm_data_debug_level, data_debug_level, int, 0644);
+MODULE_PARM_DESC(cm_data_debug_level,
+		 "Enable data path debug tracing for connected mode if > 0");
+#endif
+
+#include "ipoib.h"
+
+#define IPOIB_CM_IETF_ID 0x1000000000000000ULL
+
+#define IPOIB_CM_RX_UPDATE_TIME (256 * HZ)
+#define IPOIB_CM_RX_TIMEOUT     (2 * 256 * HZ)
+#define IPOIB_CM_RX_DELAY       (3 * 256 * HZ)
+#define IPOIB_CM_RX_UPDATE_MASK (0x3)
+
+struct ipoib_cm_id {
+	struct ib_cm_id *id;
+	int flags;
+	u32 remote_qpn;
+	u32 remote_mtu;
+};
+
+static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id,
+			       struct ib_cm_event *event);
+
+static void ipoib_cm_dma_unmap_rx(struct ipoib_dev_priv *priv,
+				  u64 mapping[IPOIB_CM_RX_SG])
+{
+	int i;
+
+	ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_CM_HEAD_SIZE, DMA_FROM_DEVICE);
+
+	for (i = 0; i < IPOIB_CM_RX_SG - 1; ++i)
+		ib_dma_unmap_single(priv->ca, mapping[i + 1], PAGE_SIZE, DMA_FROM_DEVICE);
+}
+
+static int ipoib_cm_post_receive(struct net_device *dev, int id)
+{
+	struct ipoib_dev_priv *priv = netdev_priv(dev);
+	struct ib_recv_wr *bad_wr;
+	int i, ret;
+
+	priv->cm.rx_wr.wr_id = id | IPOIB_CM_OP_SRQ;
+
+	for (i = 0; i < IPOIB_CM_RX_SG; ++i)
+		priv->cm.rx_sge[i].addr = priv->cm.srq_ring[id].mapping[i];
+
+	ret = ib_post_srq_recv(priv->cm.srq, &priv->cm.rx_wr, &bad_wr);
+	if (unlikely(ret)) {
+		ipoib_warn(priv, "post srq failed for buf %d (%d)\n", id, ret);
+		ipoib_cm_dma_unmap_rx(priv, priv->cm.srq_ring[id].mapping);
+		dev_kfree_skb_any(priv->cm.srq_ring[id].skb);
+		priv->cm.srq_ring[id].skb = NULL;
+	}
+
+	return ret;
+}
+
+static int ipoib_cm_alloc_rx_skb(struct net_device *dev, int id,
+				 u64 mapping[IPOIB_CM_RX_SG])
+{
+	struct ipoib_dev_priv *priv = netdev_priv(dev);
+	struct sk_buff *skb;
+	int i;
+
+	skb = dev_alloc_skb(IPOIB_CM_HEAD_SIZE + 12);
+	if (unlikely(!skb))
+		return -ENOMEM;
+
+	/*
+	 * IPoIB adds a 4 byte header. So we need 12 more bytes to align the
+	 * IP header to a multiple of 16.
+	 */
+	skb_reserve(skb, 12);
+
+	mapping[0] = ib_dma_map_single(priv->ca, skb->data, IPOIB_CM_HEAD_SIZE,
+				       DMA_FROM_DEVICE);
+	if (unlikely(ib_dma_mapping_error(priv->ca, mapping[0]))) {
+		dev_kfree_skb_any(skb);
+		return -EIO;
+	}
+
+	for (i = 0; i < IPOIB_CM_RX_SG - 1; i++) {
+		struct page *page = alloc_page(GFP_ATOMIC);
+
+		if (!page)
+			goto partial_error;
+		skb_fill_page_desc(skb, i, page, 0, PAGE_SIZE);
+
+		mapping[i + 1] = ib_dma_map_page(priv->ca, skb_shinfo(skb)->frags[i].page,
+						 0, PAGE_SIZE, DMA_TO_DEVICE);
+		if (unlikely(ib_dma_mapping_error(priv->ca, mapping[i + 1])))
+			goto partial_error;
+	}
+
+	priv->cm.srq_ring[id].skb = skb;
+	return 0;
+
+partial_error:
+
+	ib_dma_unmap_single(priv->ca, mapping[0], IPOIB_CM_HEAD_SIZE, DMA_FROM_DEVICE);
+
+	for (; i >= 0; --i)
+		ib_dma_unmap_single(priv->ca, mapping[i + 1], PAGE_SIZE, DMA_FROM_DEVICE);
+
+	kfree_skb(skb);
+	return -ENOMEM;
+}
+
+static struct ib_qp *ipoib_cm_create_rx_qp(struct net_device *dev,
+					   struct ipoib_cm_rx *p)
+{
+	struct ipoib_dev_priv *priv = netdev_priv(dev);
+	struct ib_qp_init_attr attr = {
+		.send_cq = priv->cq, /* does not matter, we never send anything */
+		.recv_cq = priv->cq,
+		.srq = priv->cm.srq,
+		.cap.max_send_wr = 1, /* FIXME: 0 Seems not to work */
+		.cap.max_send_sge = 1, /* FIXME: 0 Seems not to work */
+		.sq_sig_type = IB_SIGNAL_ALL_WR,
+		.qp_type = IB_QPT_RC,
+		.qp_context = p,
+	};
+	return ib_create_qp(priv->pd, &attr);
+}
+
+static int ipoib_cm_modify_rx_qp(struct net_device *dev,
+				  struct ib_cm_id *cm_id, struct ib_qp *qp,
+				  unsigned psn)
+{
+	struct ipoib_dev_priv *priv = netdev_priv(dev);
+	struct ib_qp_attr qp_attr;
+	int qp_attr_mask, ret;
+
+	qp_attr.qp_state = IB_QPS_INIT;
+	ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
+	if (ret) {
+		ipoib_warn(priv, "failed to init QP attr for INIT: %d\n", ret);
+		return ret;
+	}
+	ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
+	if (ret) {
+		ipoib_warn(priv, "failed to modify QP to INIT: %d\n", ret);
+		return ret;
+	}
+	qp_attr.qp_state = IB_QPS_RTR;
+	ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
+	if (ret) {
+		ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret);
+		return ret;
+	}
+	qp_attr.rq_psn = psn;
+	ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
+	if (ret) {
+		ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret);
+		return ret;
+	}
+	return 0;
+}
+
+static int ipoib_cm_send_rep(struct net_device *dev, struct ib_cm_id *cm_id,
+			     struct ib_qp *qp, struct ib_cm_req_event_param *req,
+			     unsigned psn)
+{
+	struct ipoib_dev_priv *priv = netdev_priv(dev);
+	struct ipoib_cm_data data = {};
+	struct ib_cm_rep_param rep = {};
+
+	data.qpn = cpu_to_be32(priv->qp->qp_num);
+	data.mtu = cpu_to_be32(IPOIB_CM_BUF_SIZE);
+
+	rep.private_data = &data;
+	rep.private_data_len = sizeof data;
+	rep.flow_control = 0;
+	rep.rnr_retry_count = req->rnr_retry_count;
+	rep.target_ack_delay = 20; /* FIXME */
+	rep.srq = 1;
+	rep.qp_num = qp->qp_num;
+	rep.starting_psn = psn;
+	return ib_send_cm_rep(cm_id, &rep);
+}
+
+static int ipoib_cm_req_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
+{
+	struct net_device *dev = cm_id->context;
+	struct ipoib_dev_priv *priv = netdev_priv(dev);
+	struct ipoib_cm_rx *p;
+	unsigned long flags;
+	unsigned psn;
+	int ret;
+
+	ipoib_dbg(priv, "REQ arrived\n");
+	p = kzalloc(sizeof *p, GFP_KERNEL);
+	if (!p)
+		return -ENOMEM;
+	p->dev = dev;
+	p->id = cm_id;
+	p->qp = ipoib_cm_create_rx_qp(dev, p);
+	if (IS_ERR(p->qp)) {
+		ret = PTR_ERR(p->qp);
+		goto err_qp;
+	}
+
+	psn = random32() & 0xffffff;
+	ret = ipoib_cm_modify_rx_qp(dev, cm_id, p->qp, psn);
+	if (ret)
+		goto err_modify;
+
+	ret = ipoib_cm_send_rep(dev, cm_id, p->qp, &event->param.req_rcvd, psn);
+	if (ret) {
+		ipoib_warn(priv, "failed to send REP: %d\n", ret);
+		goto err_rep;
+	}
+
+	cm_id->context = p;
+	p->jiffies = jiffies;
+	spin_lock_irqsave(&priv->lock, flags);
+	list_add(&p->list, &priv->cm.passive_ids);
+	spin_unlock_irqrestore(&priv->lock, flags);
+	queue_delayed_work(ipoib_workqueue,
+			   &priv->cm.stale_task, IPOIB_CM_RX_DELAY);
+	return 0;
+
+err_rep:
+err_modify:
+	ib_destroy_qp(p->qp);
+err_qp:
+	kfree(p);
+	return ret;
+}
+
+static int ipoib_cm_rx_handler(struct ib_cm_id *cm_id,
+			       struct ib_cm_event *event)
+{
+	struct ipoib_cm_rx *p;
+	struct ipoib_dev_priv *priv;
+	unsigned long flags;
+	int ret;
+
+	switch (event->event) {
+	case IB_CM_REQ_RECEIVED:
+		return ipoib_cm_req_handler(cm_id, event);
+	case IB_CM_DREQ_RECEIVED:
+		p = cm_id->context;
+		ib_send_cm_drep(cm_id, NULL, 0);
+		/* Fall through */
+	case IB_CM_REJ_RECEIVED:
+		p = cm_id->context;
+		priv = netdev_priv(p->dev);
+		spin_lock_irqsave(&priv->lock, flags);
+		if (list_empty(&p->list))
+			ret = 0; /* Connection is going away already. */
+		else {
+			list_del_init(&p->list);
+			ret = -ECONNRESET;
+		}
+		spin_unlock_irqrestore(&priv->lock, flags);
+		if (ret) {
+			ib_destroy_qp(p->qp);
+			kfree(p);
+			return ret;
+		}
+		return 0;
+	default:
+		return 0;
+	}
+}
+/* Adjust length of skb with fragments to match received data */
+static void skb_put_frags(struct sk_buff *skb, unsigned int hdr_space,
+			  unsigned int length)
+{
+	int i, num_frags;
+	unsigned int size;
+
+	/* put header into skb */
+	size = min(length, hdr_space);
+	skb->tail += size;
+	skb->len += size;
+	length -= size;
+
+	num_frags = skb_shinfo(skb)->nr_frags;
+	for (i = 0; i < num_frags; i++) {
+		skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
+
+		if (length == 0) {
+			/* don't need this page */
+			__free_page(frag->page);
+			--skb_shinfo(skb)->nr_frags;
+		} else {
+			size = min(length, (unsigned) PAGE_SIZE);
+
+			frag->size = size;
+			skb->data_len += size;
+			skb->truesize += size;
+			skb->len += size;
+			length -= size;
+		}
+	}
+}
+
+void ipoib_cm_handle_rx_wc(struct net_device *dev, struct ib_wc *wc)
+{
+	struct ipoib_dev_priv *priv = netdev_priv(dev);
+	unsigned int wr_id = wc->wr_id & ~IPOIB_CM_OP_SRQ;
+	struct sk_buff *skb;
+	struct ipoib_cm_rx *p;
+	unsigned long flags;
+	u64 mapping[IPOIB_CM_RX_SG];
+
+	ipoib_dbg_data(priv, "cm recv completion: id %d, op %d, status: %d\n",
+		       wr_id, wc->opcode, wc->status);
+
+	if (unlikely(wr_id >= ipoib_recvq_size)) {
+		ipoib_warn(priv, "cm recv completion event with wrid %d (> %d)\n",
+			   wr_id, ipoib_recvq_size);
+		return;
+	}
+
+	skb  = priv->cm.srq_ring[wr_id].skb;
+
+	if (unlikely(wc->status != IB_WC_SUCCESS)) {
+		ipoib_dbg(priv, "cm recv error "
+			   "(status=%d, wrid=%d vend_err %x)\n",
+			   wc->status, wr_id, wc->vendor_err);
+		++priv->stats.rx_dropped;
+		goto repost;
+	}
+
+	if (!likely(wr_id & IPOIB_CM_RX_UPDATE_MASK)) {
+		p = wc->qp->qp_context;
+		if (time_after_eq(jiffies, p->jiffies + IPOIB_CM_RX_UPDATE_TIME)) {
+			spin_lock_irqsave(&priv->lock, flags);
+			p->jiffies = jiffies;
+			/* Move this entry to list head, but do
+			 * not re-add it if it has been removed. */
+			if (!list_empty(&p->list))
+				list_move(&p->list, &priv->cm.passive_ids);
+			spin_unlock_irqrestore(&priv->lock, flags);
+			queue_delayed_work(ipoib_workqueue,
+					   &priv->cm.stale_task, IPOIB_CM_RX_DELAY);
+		}
+	}
+
+	if (unlikely(ipoib_cm_alloc_rx_skb(dev, wr_id, mapping))) {
+		/*
+		 * If we can't allocate a new RX buffer, dump
+		 * this packet and reuse the old buffer.
+		 */
+		ipoib_dbg(priv, "failed to allocate receive buffer %d\n", wr_id);
+		++priv->stats.rx_dropped;
+		goto repost;
+	}
+
+	ipoib_cm_dma_unmap_rx(priv, priv->cm.srq_ring[wr_id].mapping);
+	memcpy(priv->cm.srq_ring[wr_id].mapping, mapping, sizeof mapping);
+
+	ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n",
+		       wc->byte_len, wc->slid);
+
+	skb_put_frags(skb, IPOIB_CM_HEAD_SIZE, wc->byte_len);
+
+	skb->protocol = ((struct ipoib_header *) skb->data)->proto;
+	skb->mac.raw = skb->data;
+	skb_pull(skb, IPOIB_ENCAP_LEN);
+
+	dev->last_rx = jiffies;
+	++priv->stats.rx_packets;
+	priv->stats.rx_bytes += skb->len;
+
+	skb->dev = dev;
+	/* XXX get correct PACKET_ type here */
+	skb->pkt_type = PACKET_HOST;
+	netif_rx_ni(skb);
+
+repost:
+	if (unlikely(ipoib_cm_post_receive(dev, wr_id)))
+		ipoib_warn(priv, "ipoib_cm_post_receive failed "
+			   "for buf %d\n", wr_id);
+}
+
+static inline int post_send(struct ipoib_dev_priv *priv,
+			    struct ipoib_cm_tx *tx,
+			    unsigned int wr_id,
+			    u64 addr, int len)
+{
+	struct ib_send_wr *bad_wr;
+
+	priv->tx_sge.addr             = addr;
+	priv->tx_sge.length           = len;
+
+	priv->tx_wr.wr_id 	      = wr_id;
+
+	return ib_post_send(tx->qp, &priv->tx_wr, &bad_wr);
+}
+
+void ipoib_cm_send(struct net_device *dev, struct sk_buff *skb, struct ipoib_cm_tx *tx)
+{
+	struct ipoib_dev_priv *priv = netdev_priv(dev);
+	struct ipoib_tx_buf *tx_req;
+	u64 addr;
+
+	if (unlikely(skb->len > tx->mtu)) {
+		ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n",
+			   skb->len, tx->mtu);
+		++priv->stats.tx_dropped;
+		++priv->stats.tx_errors;
+		ipoib_cm_skb_too_long(dev, skb, tx->mtu - INFINIBAND_ALEN);
+		return;
+	}
+
+	ipoib_dbg_data(priv, "sending packet: head 0x%x length %d connection 0x%x\n",
+		       tx->tx_head, skb->len, tx->qp->qp_num);
+
+	/*
+	 * We put the skb into the tx_ring _before_ we call post_send()
+	 * because it's entirely possible that the completion handler will
+	 * run before we execute anything after the post_send().  That
+	 * means we have to make sure everything is properly recorded and
+	 * our state is consistent before we call post_send().
+	 */
+	tx_req = &tx->tx_ring[tx->tx_head & (ipoib_sendq_size - 1)];
+	tx_req->skb = skb;
+	addr = ib_dma_map_single(priv->ca, skb->data, skb->len, DMA_TO_DEVICE);
+	if (unlikely(ib_dma_mapping_error(priv->ca, addr))) {
+		++priv->stats.tx_errors;
+		dev_kfree_skb_any(skb);
+		return;
+	}
+
+	tx_req->mapping = addr;
+
+	if (unlikely(post_send(priv, tx, tx->tx_head & (ipoib_sendq_size - 1),
+			        addr, skb->len))) {
+		ipoib_warn(priv, "post_send failed\n");
+		++priv->stats.tx_errors;
+		ib_dma_unmap_single(priv->ca, addr, skb->len, DMA_TO_DEVICE);
+		dev_kfree_skb_any(skb);
+	} else {
+		dev->trans_start = jiffies;
+		++tx->tx_head;
+
+		if (tx->tx_head - tx->tx_tail == ipoib_sendq_size) {
+			ipoib_dbg(priv, "TX ring 0x%x full, stopping kernel net queue\n",
+				  tx->qp->qp_num);
+			netif_stop_queue(dev);
+			set_bit(IPOIB_FLAG_NETIF_STOPPED, &tx->flags);
+		}
+	}
+}
+
+static void ipoib_cm_handle_tx_wc(struct net_device *dev, struct ipoib_cm_tx *tx,
+				  struct ib_wc *wc)
+{
+	struct ipoib_dev_priv *priv = netdev_priv(dev);
+	unsigned int wr_id = wc->wr_id;
+	struct ipoib_tx_buf *tx_req;
+	unsigned long flags;
+
+	ipoib_dbg_data(priv, "cm send completion: id %d, op %d, status: %d\n",
+		       wr_id, wc->opcode, wc->status);
+
+	if (unlikely(wr_id >= ipoib_sendq_size)) {
+		ipoib_warn(priv, "cm send completion event with wrid %d (> %d)\n",
+			   wr_id, ipoib_sendq_size);
+		return;
+	}
+
+	tx_req = &tx->tx_ring[wr_id];
+
+	ib_dma_unmap_single(priv->ca, tx_req->mapping, tx_req->skb->len, DMA_TO_DEVICE);
+
+	/* FIXME: is this right? Shouldn't we only increment on success? */
+	++priv->stats.tx_packets;
+	priv->stats.tx_bytes += tx_req->skb->len;
+
+	dev_kfree_skb_any(tx_req->skb);
+
+	spin_lock_irqsave(&priv->tx_lock, flags);
+	++tx->tx_tail;
+	if (unlikely(test_bit(IPOIB_FLAG_NETIF_STOPPED, &tx->flags)) &&
+	    tx->tx_head - tx->tx_tail <= ipoib_sendq_size >> 1) {
+		clear_bit(IPOIB_FLAG_NETIF_STOPPED, &tx->flags);
+		netif_wake_queue(dev);
+	}
+
+	if (wc->status != IB_WC_SUCCESS &&
+	    wc->status != IB_WC_WR_FLUSH_ERR) {
+		struct ipoib_neigh *neigh;
+
+		ipoib_dbg(priv, "failed cm send event "
+			   "(status=%d, wrid=%d vend_err %x)\n",
+			   wc->status, wr_id, wc->vendor_err);
+
+		spin_lock(&priv->lock);
+		neigh = tx->neigh;
+
+		if (neigh) {
+			neigh->cm = NULL;
+			list_del(&neigh->list);
+			if (neigh->ah)
+				ipoib_put_ah(neigh->ah);
+			ipoib_neigh_free(dev, neigh);
+
+			tx->neigh = NULL;
+		}
+
+		/* queue would be re-started anyway when TX is destroyed,
+		 * but it makes sense to do it ASAP here. */
+		if (test_and_clear_bit(IPOIB_FLAG_NETIF_STOPPED, &tx->flags))
+			netif_wake_queue(dev);
+
+		if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
+			list_move(&tx->list, &priv->cm.reap_list);
+			queue_work(ipoib_workqueue, &priv->cm.reap_task);
+		}
+
+		clear_bit(IPOIB_FLAG_OPER_UP, &tx->flags);
+
+		spin_unlock(&priv->lock);
+	}
+
+	spin_unlock_irqrestore(&priv->tx_lock, flags);
+}
+
+static void ipoib_cm_tx_completion(struct ib_cq *cq, void *tx_ptr)
+{
+	struct ipoib_cm_tx *tx = tx_ptr;
+	int n, i;
+
+	ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
+	do {
+		n = ib_poll_cq(cq, IPOIB_NUM_WC, tx->ibwc);
+		for (i = 0; i < n; ++i)
+			ipoib_cm_handle_tx_wc(tx->dev, tx, tx->ibwc + i);
+	} while (n == IPOIB_NUM_WC);
+}
+
+int ipoib_cm_dev_open(struct net_device *dev)
+{
+	struct ipoib_dev_priv *priv = netdev_priv(dev);
+	int ret;
+
+	if (!IPOIB_CM_SUPPORTED(dev->dev_addr))
+		return 0;
+
+	priv->cm.id = ib_create_cm_id(priv->ca, ipoib_cm_rx_handler, dev);
+	if (IS_ERR(priv->cm.id)) {
+		printk(KERN_WARNING "%s: failed to create CM ID\n", priv->ca->name);
+		return IS_ERR(priv->cm.id);
+	}
+
+	ret = ib_cm_listen(priv->cm.id, cpu_to_be64(IPOIB_CM_IETF_ID | priv->qp->qp_num),
+			   0, NULL);
+	if (ret) {
+		printk(KERN_WARNING "%s: failed to listen on ID 0x%llx\n", priv->ca->name,
+		       IPOIB_CM_IETF_ID | priv->qp->qp_num);
+		ib_destroy_cm_id(priv->cm.id);
+		return ret;
+	}
+	return 0;
+}
+
+void ipoib_cm_dev_stop(struct net_device *dev)
+{
+	struct ipoib_dev_priv *priv = netdev_priv(dev);
+	struct ipoib_cm_rx *p;
+	unsigned long flags;
+
+	if (!IPOIB_CM_SUPPORTED(dev->dev_addr))
+		return;
+
+	ib_destroy_cm_id(priv->cm.id);
+	spin_lock_irqsave(&priv->lock, flags);
+	while (!list_empty(&priv->cm.passive_ids)) {
+		p = list_entry(priv->cm.passive_ids.next, typeof(*p), list);
+		list_del_init(&p->list);
+		spin_unlock_irqrestore(&priv->lock, flags);
+		ib_destroy_cm_id(p->id);
+		ib_destroy_qp(p->qp);
+		kfree(p);
+		spin_lock_irqsave(&priv->lock, flags);
+	}
+	spin_unlock_irqrestore(&priv->lock, flags);
+
+	cancel_delayed_work(&priv->cm.stale_task);
+}
+
+static int ipoib_cm_rep_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
+{
+	struct ipoib_cm_tx *p = cm_id->context;
+	struct ipoib_dev_priv *priv = netdev_priv(p->dev);
+	struct ipoib_cm_data *data = event->private_data;
+	struct sk_buff_head skqueue;
+	struct ib_qp_attr qp_attr;
+	int qp_attr_mask, ret;
+	struct sk_buff *skb;
+	unsigned long flags;
+
+	p->mtu = be32_to_cpu(data->mtu);
+
+	if (p->mtu < priv->dev->mtu + IPOIB_ENCAP_LEN) {
+		ipoib_warn(priv, "Rejecting connection: mtu %d < device mtu %d + 4\n",
+			   p->mtu, priv->dev->mtu);
+		return -EINVAL;
+	}
+
+	qp_attr.qp_state = IB_QPS_RTR;
+	ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
+	if (ret) {
+		ipoib_warn(priv, "failed to init QP attr for RTR: %d\n", ret);
+		return ret;
+	}
+
+	qp_attr.rq_psn = 0 /* FIXME */;
+	ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask);
+	if (ret) {
+		ipoib_warn(priv, "failed to modify QP to RTR: %d\n", ret);
+		return ret;
+	}
+
+	qp_attr.qp_state = IB_QPS_RTS;
+	ret = ib_cm_init_qp_attr(cm_id, &qp_attr, &qp_attr_mask);
+	if (ret) {
+		ipoib_warn(priv, "failed to init QP attr for RTS: %d\n", ret);
+		return ret;
+	}
+	ret = ib_modify_qp(p->qp, &qp_attr, qp_attr_mask);
+	if (ret) {
+		ipoib_warn(priv, "failed to modify QP to RTS: %d\n", ret);
+		return ret;
+	}
+
+	skb_queue_head_init(&skqueue);
+
+	spin_lock_irqsave(&priv->lock, flags);
+	set_bit(IPOIB_FLAG_OPER_UP, &p->flags);
+	if (p->neigh)
+		while ((skb = __skb_dequeue(&p->neigh->queue)))
+			__skb_queue_tail(&skqueue, skb);
+	spin_unlock_irqrestore(&priv->lock, flags);
+
+	while ((skb = __skb_dequeue(&skqueue))) {
+		skb->dev = p->dev;
+		if (dev_queue_xmit(skb))
+			ipoib_warn(priv, "dev_queue_xmit failed "
+				   "to requeue packet\n");
+	}
+
+	ret = ib_send_cm_rtu(cm_id, NULL, 0);
+	if (ret) {
+		ipoib_warn(priv, "failed to send RTU: %d\n", ret);
+		return ret;
+	}
+	return 0;
+}
+
+static struct ib_qp *ipoib_cm_create_tx_qp(struct net_device *dev, struct ib_cq *cq)
+{
+	struct ipoib_dev_priv *priv = netdev_priv(dev);
+	struct ib_qp_init_attr attr = {};
+	attr.recv_cq = priv->cq;
+	attr.srq = priv->cm.srq;
+	attr.cap.max_send_wr = ipoib_sendq_size;
+	attr.cap.max_send_sge = 1;
+	attr.sq_sig_type = IB_SIGNAL_ALL_WR;
+	attr.qp_type = IB_QPT_RC;
+	attr.send_cq = cq;
+	return ib_create_qp(priv->pd, &attr);
+}
+
+static int ipoib_cm_send_req(struct net_device *dev,
+			     struct ib_cm_id *id, struct ib_qp *qp,
+			     u32 qpn,
+			     struct ib_sa_path_rec *pathrec)
+{
+	struct ipoib_dev_priv *priv = netdev_priv(dev);
+	struct ipoib_cm_data data = {};
+	struct ib_cm_req_param req = {};
+
+	data.qpn = cpu_to_be32(priv->qp->qp_num);
+	data.mtu = cpu_to_be32(IPOIB_CM_BUF_SIZE);
+
+	req.primary_path 	      = pathrec;
+	req.alternate_path 	      = NULL;
+	req.service_id                = cpu_to_be64(IPOIB_CM_IETF_ID | qpn);
+	req.qp_num 		      = qp->qp_num;
+	req.qp_type 		      = qp->qp_type;
+	req.private_data 	      = &data;
+	req.private_data_len 	      = sizeof data;
+	req.flow_control 	      = 0;
+
+	req.starting_psn              = 0; /* FIXME */
+
+	/*
+	 * Pick some arbitrary defaults here; we could make these
+	 * module parameters if anyone cared about setting them.
+	 */
+	req.responder_resources	      = 4;
+	req.remote_cm_response_timeout = 20;
+	req.local_cm_response_timeout  = 20;
+	req.retry_count 	      = 0; /* RFC draft warns against retries */
+	req.rnr_retry_count 	      = 0; /* RFC draft warns against retries */
+	req.max_cm_retries 	      = 15;
+	req.srq 	              = 1;
+	return ib_send_cm_req(id, &req);
+}
+
+static int ipoib_cm_modify_tx_init(struct net_device *dev,
+				  struct ib_cm_id *cm_id, struct ib_qp *qp)
+{
+	struct ipoib_dev_priv *priv = netdev_priv(dev);
+	struct ib_qp_attr qp_attr;
+	int qp_attr_mask, ret;
+	ret = ib_find_cached_pkey(priv->ca, priv->port, priv->pkey, &qp_attr.pkey_index);
+	if (ret) {
+		ipoib_warn(priv, "pkey 0x%x not in cache: %d\n", priv->pkey, ret);
+		return ret;
+	}
+
+	qp_attr.qp_state = IB_QPS_INIT;
+	qp_attr.qp_access_flags = IB_ACCESS_LOCAL_WRITE;
+	qp_attr.port_num = priv->port;
+	qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS | IB_QP_PKEY_INDEX | IB_QP_PORT;
+
+	ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
+	if (ret) {
+		ipoib_warn(priv, "failed to modify tx QP to INIT: %d\n", ret);
+		return ret;
+	}
+	return 0;
+}
+
+static int ipoib_cm_tx_init(struct ipoib_cm_tx *p, u32 qpn,
+			    struct ib_sa_path_rec *pathrec)
+{
+	struct ipoib_dev_priv *priv = netdev_priv(p->dev);
+	int ret;
+
+	p->tx_ring = kzalloc(ipoib_sendq_size * sizeof *p->tx_ring,
+				GFP_KERNEL);
+	if (!p->tx_ring) {
+		ipoib_warn(priv, "failed to allocate tx ring\n");
+		ret = -ENOMEM;
+		goto err_tx;
+	}
+
+	p->cq = ib_create_cq(priv->ca, ipoib_cm_tx_completion, NULL, p,
+			     ipoib_sendq_size + 1);
+	if (IS_ERR(p->cq)) {
+		ret = PTR_ERR(p->cq);
+		ipoib_warn(priv, "failed to allocate tx cq: %d\n", ret);
+		goto err_cq;
+	}
+
+	ret = ib_req_notify_cq(p->cq, IB_CQ_NEXT_COMP);
+	if (ret) {
+		ipoib_warn(priv, "failed to request completion notification: %d\n", ret);
+		goto err_req_notify;
+	}
+
+	p->qp = ipoib_cm_create_tx_qp(p->dev, p->cq);
+	if (IS_ERR(p->qp)) {
+		ret = PTR_ERR(p->qp);
+		ipoib_warn(priv, "failed to allocate tx qp: %d\n", ret);
+		goto err_qp;
+	}
+
+	p->id = ib_create_cm_id(priv->ca, ipoib_cm_tx_handler, p);
+	if (IS_ERR(p->id)) {
+		ret = PTR_ERR(p->id);
+		ipoib_warn(priv, "failed to create tx cm id: %d\n", ret);
+		goto err_id;
+	}
+
+	ret = ipoib_cm_modify_tx_init(p->dev, p->id,  p->qp);
+	if (ret) {
+		ipoib_warn(priv, "failed to modify tx qp to rtr: %d\n", ret);
+		goto err_modify;
+	}
+
+	ret = ipoib_cm_send_req(p->dev, p->id, p->qp, qpn, pathrec);
+	if (ret) {
+		ipoib_warn(priv, "failed to send cm req: %d\n", ret);
+		goto err_send_cm;
+	}
+
+	ipoib_dbg(priv, "Request connection 0x%x for gid " IPOIB_GID_FMT " qpn 0x%x\n",
+		  p->qp->qp_num, IPOIB_GID_ARG(pathrec->dgid), qpn);
+
+	return 0;
+
+err_send_cm:
+err_modify:
+	ib_destroy_cm_id(p->id);
+err_id:
+	p->id = NULL;
+	ib_destroy_qp(p->qp);
+err_req_notify:
+err_qp:
+	p->qp = NULL;
+	ib_destroy_cq(p->cq);
+err_cq:
+	p->cq = NULL;
+err_tx:
+	return ret;
+}
+
+static void ipoib_cm_tx_destroy(struct ipoib_cm_tx *p)
+{
+	struct ipoib_dev_priv *priv = netdev_priv(p->dev);
+	struct ipoib_tx_buf *tx_req;
+
+	ipoib_dbg(priv, "Destroy active connection 0x%x head 0x%x tail 0x%x\n",
+		  p->qp ? p->qp->qp_num : 0, p->tx_head, p->tx_tail);
+
+	if (p->id)
+		ib_destroy_cm_id(p->id);
+
+	if (p->qp)
+		ib_destroy_qp(p->qp);
+
+	if (p->cq)
+		ib_destroy_cq(p->cq);
+
+	if (test_bit(IPOIB_FLAG_NETIF_STOPPED, &p->flags))
+		netif_wake_queue(p->dev);
+
+	if (p->tx_ring) {
+		while ((int) p->tx_tail - (int) p->tx_head < 0) {
+			tx_req = &p->tx_ring[p->tx_tail & (ipoib_sendq_size - 1)];
+			ib_dma_unmap_single(priv->ca, tx_req->mapping, tx_req->skb->len,
+					 DMA_TO_DEVICE);
+			dev_kfree_skb_any(tx_req->skb);
+			++p->tx_tail;
+		}
+
+		kfree(p->tx_ring);
+	}
+
+	kfree(p);
+}
+
+static int ipoib_cm_tx_handler(struct ib_cm_id *cm_id,
+			       struct ib_cm_event *event)
+{
+	struct ipoib_cm_tx *tx = cm_id->context;
+	struct ipoib_dev_priv *priv = netdev_priv(tx->dev);
+	struct net_device *dev = priv->dev;
+	struct ipoib_neigh *neigh;
+	unsigned long flags;
+	int ret;
+
+	switch (event->event) {
+	case IB_CM_DREQ_RECEIVED:
+		ipoib_dbg(priv, "DREQ received.\n");
+		ib_send_cm_drep(cm_id, NULL, 0);
+		break;
+	case IB_CM_REP_RECEIVED:
+		ipoib_dbg(priv, "REP received.\n");
+		ret = ipoib_cm_rep_handler(cm_id, event);
+		if (ret)
+			ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED,
+				       NULL, 0, NULL, 0);
+		break;
+	case IB_CM_REQ_ERROR:
+	case IB_CM_REJ_RECEIVED:
+	case IB_CM_TIMEWAIT_EXIT:
+		ipoib_dbg(priv, "CM error %d.\n", event->event);
+		spin_lock_irqsave(&priv->tx_lock, flags);
+		spin_lock(&priv->lock);
+		neigh = tx->neigh;
+
+		if (neigh) {
+			neigh->cm = NULL;
+			list_del(&neigh->list);
+			if (neigh->ah)
+				ipoib_put_ah(neigh->ah);
+			ipoib_neigh_free(dev, neigh);
+
+			tx->neigh = NULL;
+		}
+
+		if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
+			list_move(&tx->list, &priv->cm.reap_list);
+			queue_work(ipoib_workqueue, &priv->cm.reap_task);
+		}
+
+		spin_unlock(&priv->lock);
+		spin_unlock_irqrestore(&priv->tx_lock, flags);
+		break;
+	default:
+		break;
+	}
+
+	return 0;
+}
+
+struct ipoib_cm_tx *ipoib_cm_create_tx(struct net_device *dev, struct ipoib_path *path,
+				       struct ipoib_neigh *neigh)
+{
+	struct ipoib_dev_priv *priv = netdev_priv(dev);
+	struct ipoib_cm_tx *tx;
+
+	tx = kzalloc(sizeof *tx, GFP_ATOMIC);
+	if (!tx)
+		return NULL;
+
+	neigh->cm = tx;
+	tx->neigh = neigh;
+	tx->path = path;
+	tx->dev = dev;
+	list_add(&tx->list, &priv->cm.start_list);
+	set_bit(IPOIB_FLAG_INITIALIZED, &tx->flags);
+	queue_work(ipoib_workqueue, &priv->cm.start_task);
+	return tx;
+}
+
+void ipoib_cm_destroy_tx(struct ipoib_cm_tx *tx)
+{
+	struct ipoib_dev_priv *priv = netdev_priv(tx->dev);
+	if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &tx->flags)) {
+		list_move(&tx->list, &priv->cm.reap_list);
+		queue_work(ipoib_workqueue, &priv->cm.reap_task);
+		ipoib_dbg(priv, "Reap connection for gid " IPOIB_GID_FMT "\n",
+			  IPOIB_GID_ARG(tx->neigh->dgid));
+		tx->neigh = NULL;
+	}
+}
+
+static void ipoib_cm_tx_start(struct work_struct *work)
+{
+	struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
+						   cm.start_task);
+	struct net_device *dev = priv->dev;
+	struct ipoib_neigh *neigh;
+	struct ipoib_cm_tx *p;
+	unsigned long flags;
+	int ret;
+
+	struct ib_sa_path_rec pathrec;
+	u32 qpn;
+
+	spin_lock_irqsave(&priv->tx_lock, flags);
+	spin_lock(&priv->lock);
+	while (!list_empty(&priv->cm.start_list)) {
+		p = list_entry(priv->cm.start_list.next, typeof(*p), list);
+		list_del_init(&p->list);
+		neigh = p->neigh;
+		qpn = IPOIB_QPN(neigh->neighbour->ha);
+		memcpy(&pathrec, &p->path->pathrec, sizeof pathrec);
+		spin_unlock(&priv->lock);
+		spin_unlock_irqrestore(&priv->tx_lock, flags);
+		ret = ipoib_cm_tx_init(p, qpn, &pathrec);
+		spin_lock_irqsave(&priv->tx_lock, flags);
+		spin_lock(&priv->lock);
+		if (ret) {
+			neigh = p->neigh;
+			if (neigh) {
+				neigh->cm = NULL;
+				list_del(&neigh->list);
+				if (neigh->ah)
+					ipoib_put_ah(neigh->ah);
+				ipoib_neigh_free(dev, neigh);
+			}
+			list_del(&p->list);
+			kfree(p);
+		}
+	}
+	spin_unlock(&priv->lock);
+	spin_unlock_irqrestore(&priv->tx_lock, flags);
+}
+
+static void ipoib_cm_tx_reap(struct work_struct *work)
+{
+	struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
+						   cm.reap_task);
+	struct ipoib_cm_tx *p;
+	unsigned long flags;
+
+	spin_lock_irqsave(&priv->tx_lock, flags);
+	spin_lock(&priv->lock);
+	while (!list_empty(&priv->cm.reap_list)) {
+		p = list_entry(priv->cm.reap_list.next, typeof(*p), list);
+		list_del(&p->list);
+		spin_unlock(&priv->lock);
+		spin_unlock_irqrestore(&priv->tx_lock, flags);
+		ipoib_cm_tx_destroy(p);
+		spin_lock_irqsave(&priv->tx_lock, flags);
+		spin_lock(&priv->lock);
+	}
+	spin_unlock(&priv->lock);
+	spin_unlock_irqrestore(&priv->tx_lock, flags);
+}
+
+static void ipoib_cm_skb_reap(struct work_struct *work)
+{
+	struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
+						   cm.skb_task);
+	struct net_device *dev = priv->dev;
+	struct sk_buff *skb;
+	unsigned long flags;
+
+	unsigned mtu = priv->mcast_mtu;
+
+	spin_lock_irqsave(&priv->tx_lock, flags);
+	spin_lock(&priv->lock);
+	while ((skb = skb_dequeue(&priv->cm.skb_queue))) {
+		spin_unlock(&priv->lock);
+		spin_unlock_irqrestore(&priv->tx_lock, flags);
+		if (skb->protocol == htons(ETH_P_IP))
+			icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu));
+#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
+		else if (skb->protocol == htons(ETH_P_IPV6))
+			icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, dev);
+#endif
+		dev_kfree_skb_any(skb);
+		spin_lock_irqsave(&priv->tx_lock, flags);
+		spin_lock(&priv->lock);
+	}
+	spin_unlock(&priv->lock);
+	spin_unlock_irqrestore(&priv->tx_lock, flags);
+}
+
+void ipoib_cm_skb_too_long(struct net_device* dev, struct sk_buff *skb,
+			   unsigned int mtu)
+{
+	struct ipoib_dev_priv *priv = netdev_priv(dev);
+	int e = skb_queue_empty(&priv->cm.skb_queue);
+
+	if (skb->dst)
+		skb->dst->ops->update_pmtu(skb->dst, mtu);
+
+	skb_queue_tail(&priv->cm.skb_queue, skb);
+	if (e)
+		queue_work(ipoib_workqueue, &priv->cm.skb_task);
+}
+
+static void ipoib_cm_stale_task(struct work_struct *work)
+{
+	struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
+						   cm.stale_task.work);
+	struct ipoib_cm_rx *p;
+	unsigned long flags;
+
+	spin_lock_irqsave(&priv->lock, flags);
+	while (!list_empty(&priv->cm.passive_ids)) {
+		/* List if sorted by LRU, start from tail,
+		 * stop when we see a recently used entry */
+		p = list_entry(priv->cm.passive_ids.prev, typeof(*p), list);
+		if (time_after_eq(jiffies, p->jiffies + IPOIB_CM_RX_TIMEOUT))
+			break;
+		list_del_init(&p->list);
+		spin_unlock_irqrestore(&priv->lock, flags);
+		ib_destroy_cm_id(p->id);
+		ib_destroy_qp(p->qp);
+		kfree(p);
+		spin_lock_irqsave(&priv->lock, flags);
+	}
+	spin_unlock_irqrestore(&priv->lock, flags);
+}
+
+
+static ssize_t show_mode(struct device *d, struct device_attribute *attr, 
+			 char *buf)
+{
+	struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(d));
+
+	if (test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags))
+		return sprintf(buf, "connected\n");
+	else
+		return sprintf(buf, "datagram\n");
+}
+
+static ssize_t set_mode(struct device *d, struct device_attribute *attr,
+			const char *buf, size_t count)
+{
+	struct net_device *dev = to_net_dev(d);
+	struct ipoib_dev_priv *priv = netdev_priv(dev);
+
+	/* flush paths if we switch modes so that connections are restarted */
+	if (IPOIB_CM_SUPPORTED(dev->dev_addr) && !strcmp(buf, "connected\n")) {
+		set_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags);
+		ipoib_warn(priv, "enabling connected mode "
+			   "will cause multicast packet drops\n");
+		ipoib_flush_paths(dev);
+		return count;
+	}
+
+	if (!strcmp(buf, "datagram\n")) {
+		clear_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags);
+		dev->mtu = min(priv->mcast_mtu, dev->mtu);
+		ipoib_flush_paths(dev);
+		return count;
+	}
+
+	return -EINVAL;
+}
+
+static DEVICE_ATTR(mode, S_IWUGO | S_IRUGO, show_mode, set_mode);
+
+int ipoib_cm_add_mode_attr(struct net_device *dev)
+{
+	return device_create_file(&dev->dev, &dev_attr_mode);
+}
+
+int ipoib_cm_dev_init(struct net_device *dev)
+{
+	struct ipoib_dev_priv *priv = netdev_priv(dev);
+	struct ib_srq_init_attr srq_init_attr = {
+		.attr = {
+			.max_wr  = ipoib_recvq_size,
+			.max_sge = IPOIB_CM_RX_SG
+		}
+	};
+	int ret, i;
+
+	INIT_LIST_HEAD(&priv->cm.passive_ids);
+	INIT_LIST_HEAD(&priv->cm.reap_list);
+	INIT_LIST_HEAD(&priv->cm.start_list);
+	INIT_WORK(&priv->cm.start_task, ipoib_cm_tx_start);
+	INIT_WORK(&priv->cm.reap_task, ipoib_cm_tx_reap);
+	INIT_WORK(&priv->cm.skb_task, ipoib_cm_skb_reap);
+	INIT_DELAYED_WORK(&priv->cm.stale_task, ipoib_cm_stale_task);
+
+	skb_queue_head_init(&priv->cm.skb_queue);
+
+	priv->cm.srq = ib_create_srq(priv->pd, &srq_init_attr);
+	if (IS_ERR(priv->cm.srq)) {
+		ret = PTR_ERR(priv->cm.srq);
+		priv->cm.srq = NULL;
+		return ret;
+	}
+
+	priv->cm.srq_ring = kzalloc(ipoib_recvq_size * sizeof *priv->cm.srq_ring,
+				    GFP_KERNEL);
+	if (!priv->cm.srq_ring) {
+		printk(KERN_WARNING "%s: failed to allocate CM ring (%d entries)\n",
+		       priv->ca->name, ipoib_recvq_size);
+		ipoib_cm_dev_cleanup(dev);
+		return -ENOMEM;
+	}
+
+	for (i = 0; i < IPOIB_CM_RX_SG; ++i)
+		priv->cm.rx_sge[i].lkey	= priv->mr->lkey;
+
+	priv->cm.rx_sge[0].length = IPOIB_CM_HEAD_SIZE;
+	for (i = 1; i < IPOIB_CM_RX_SG; ++i)
+		priv->cm.rx_sge[i].length = PAGE_SIZE;
+	priv->cm.rx_wr.next = NULL;
+	priv->cm.rx_wr.sg_list = priv->cm.rx_sge;
+	priv->cm.rx_wr.num_sge = IPOIB_CM_RX_SG;
+
+	for (i = 0; i < ipoib_recvq_size; ++i) {
+		if (ipoib_cm_alloc_rx_skb(dev, i, priv->cm.srq_ring[i].mapping)) {
+			ipoib_warn(priv, "failed to allocate receive buffer %d\n", i);
+			ipoib_cm_dev_cleanup(dev);
+			return -ENOMEM;
+		}
+		if (ipoib_cm_post_receive(dev, i)) {
+			ipoib_warn(priv, "ipoib_ib_post_receive failed for buf %d\n", i);
+			ipoib_cm_dev_cleanup(dev);
+			return -EIO;
+		}
+	}
+
+	priv->dev->dev_addr[0] = IPOIB_FLAGS_RC;
+	return 0;
+}
+
+void ipoib_cm_dev_cleanup(struct net_device *dev)
+{
+	struct ipoib_dev_priv *priv = netdev_priv(dev);
+	int i, ret;
+
+	if (!priv->cm.srq)
+		return;
+
+	ipoib_dbg(priv, "Cleanup ipoib connected mode.\n");
+
+	ret = ib_destroy_srq(priv->cm.srq);
+	if (ret)
+		ipoib_warn(priv, "ib_destroy_srq failed: %d\n", ret);
+
+	priv->cm.srq = NULL;
+	if (!priv->cm.srq_ring)
+		return;
+	for (i = 0; i < ipoib_recvq_size; ++i)
+		if (priv->cm.srq_ring[i].skb) {
+			ipoib_cm_dma_unmap_rx(priv, priv->cm.srq_ring[i].mapping);
+			dev_kfree_skb_any(priv->cm.srq_ring[i].skb);
+			priv->cm.srq_ring[i].skb = NULL;
+		}
+	kfree(priv->cm.srq_ring);
+	priv->cm.srq_ring = NULL;
+}