Adding upstream version 5.10.209.upstream/5.10.209upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1312 insertions, 0 deletions

diff --git a/drivers/infiniband/ulp/ipoib/ipoib_ib.c b/drivers/infiniband/ulp/ipoib/ipoib_ib.c
new file mode 100644
index 000000000..494f413dc
--- /dev/null
+++ b/drivers/infiniband/ulp/ipoib/ipoib_ib.c
@@ -0,0 +1,1312 @@
+/*
+ * Copyright (c) 2004, 2005 Topspin Communications.  All rights reserved.
+ * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
+ * Copyright (c) 2005 Mellanox Technologies. All rights reserved.
+ * Copyright (c) 2004, 2005 Voltaire, Inc. 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.
+ */
+
+#include <linux/delay.h>
+#include <linux/moduleparam.h>
+#include <linux/dma-mapping.h>
+#include <linux/slab.h>
+
+#include <linux/ip.h>
+#include <linux/tcp.h>
+#include <rdma/ib_cache.h>
+
+#include "ipoib.h"
+
+#ifdef CONFIG_INFINIBAND_IPOIB_DEBUG_DATA
+static int data_debug_level;
+
+module_param(data_debug_level, int, 0644);
+MODULE_PARM_DESC(data_debug_level,
+		 "Enable data path debug tracing if > 0");
+#endif
+
+struct ipoib_ah *ipoib_create_ah(struct net_device *dev,
+				 struct ib_pd *pd, struct rdma_ah_attr *attr)
+{
+	struct ipoib_ah *ah;
+	struct ib_ah *vah;
+
+	ah = kmalloc(sizeof(*ah), GFP_KERNEL);
+	if (!ah)
+		return ERR_PTR(-ENOMEM);
+
+	ah->dev       = dev;
+	ah->last_send = 0;
+	kref_init(&ah->ref);
+
+	vah = rdma_create_ah(pd, attr, RDMA_CREATE_AH_SLEEPABLE);
+	if (IS_ERR(vah)) {
+		kfree(ah);
+		ah = (struct ipoib_ah *)vah;
+	} else {
+		ah->ah = vah;
+		ipoib_dbg(ipoib_priv(dev), "Created ah %p\n", ah->ah);
+	}
+
+	return ah;
+}
+
+void ipoib_free_ah(struct kref *kref)
+{
+	struct ipoib_ah *ah = container_of(kref, struct ipoib_ah, ref);
+	struct ipoib_dev_priv *priv = ipoib_priv(ah->dev);
+
+	unsigned long flags;
+
+	spin_lock_irqsave(&priv->lock, flags);
+	list_add_tail(&ah->list, &priv->dead_ahs);
+	spin_unlock_irqrestore(&priv->lock, flags);
+}
+
+static void ipoib_ud_dma_unmap_rx(struct ipoib_dev_priv *priv,
+				  u64 mapping[IPOIB_UD_RX_SG])
+{
+	ib_dma_unmap_single(priv->ca, mapping[0],
+			    IPOIB_UD_BUF_SIZE(priv->max_ib_mtu),
+			    DMA_FROM_DEVICE);
+}
+
+static int ipoib_ib_post_receive(struct net_device *dev, int id)
+{
+	struct ipoib_dev_priv *priv = ipoib_priv(dev);
+	int ret;
+
+	priv->rx_wr.wr_id   = id | IPOIB_OP_RECV;
+	priv->rx_sge[0].addr = priv->rx_ring[id].mapping[0];
+	priv->rx_sge[1].addr = priv->rx_ring[id].mapping[1];
+
+
+	ret = ib_post_recv(priv->qp, &priv->rx_wr, NULL);
+	if (unlikely(ret)) {
+		ipoib_warn(priv, "receive failed for buf %d (%d)\n", id, ret);
+		ipoib_ud_dma_unmap_rx(priv, priv->rx_ring[id].mapping);
+		dev_kfree_skb_any(priv->rx_ring[id].skb);
+		priv->rx_ring[id].skb = NULL;
+	}
+
+	return ret;
+}
+
+static struct sk_buff *ipoib_alloc_rx_skb(struct net_device *dev, int id)
+{
+	struct ipoib_dev_priv *priv = ipoib_priv(dev);
+	struct sk_buff *skb;
+	int buf_size;
+	u64 *mapping;
+
+	buf_size = IPOIB_UD_BUF_SIZE(priv->max_ib_mtu);
+
+	skb = dev_alloc_skb(buf_size + IPOIB_HARD_LEN);
+	if (unlikely(!skb))
+		return NULL;
+
+	/*
+	 * the IP header will be at IPOIP_HARD_LEN + IB_GRH_BYTES, that is
+	 * 64 bytes aligned
+	 */
+	skb_reserve(skb, sizeof(struct ipoib_pseudo_header));
+
+	mapping = priv->rx_ring[id].mapping;
+	mapping[0] = ib_dma_map_single(priv->ca, skb->data, buf_size,
+				       DMA_FROM_DEVICE);
+	if (unlikely(ib_dma_mapping_error(priv->ca, mapping[0])))
+		goto error;
+
+	priv->rx_ring[id].skb = skb;
+	return skb;
+error:
+	dev_kfree_skb_any(skb);
+	return NULL;
+}
+
+static int ipoib_ib_post_receives(struct net_device *dev)
+{
+	struct ipoib_dev_priv *priv = ipoib_priv(dev);
+	int i;
+
+	for (i = 0; i < ipoib_recvq_size; ++i) {
+		if (!ipoib_alloc_rx_skb(dev, i)) {
+			ipoib_warn(priv, "failed to allocate receive buffer %d\n", i);
+			return -ENOMEM;
+		}
+		if (ipoib_ib_post_receive(dev, i)) {
+			ipoib_warn(priv, "ipoib_ib_post_receive failed for buf %d\n", i);
+			return -EIO;
+		}
+	}
+
+	return 0;
+}
+
+static void ipoib_ib_handle_rx_wc(struct net_device *dev, struct ib_wc *wc)
+{
+	struct ipoib_dev_priv *priv = ipoib_priv(dev);
+	unsigned int wr_id = wc->wr_id & ~IPOIB_OP_RECV;
+	struct sk_buff *skb;
+	u64 mapping[IPOIB_UD_RX_SG];
+	union ib_gid *dgid;
+	union ib_gid *sgid;
+
+	ipoib_dbg_data(priv, "recv completion: id %d, status: %d\n",
+		       wr_id, wc->status);
+
+	if (unlikely(wr_id >= ipoib_recvq_size)) {
+		ipoib_warn(priv, "recv completion event with wrid %d (> %d)\n",
+			   wr_id, ipoib_recvq_size);
+		return;
+	}
+
+	skb  = priv->rx_ring[wr_id].skb;
+
+	if (unlikely(wc->status != IB_WC_SUCCESS)) {
+		if (wc->status != IB_WC_WR_FLUSH_ERR)
+			ipoib_warn(priv,
+				   "failed recv event (status=%d, wrid=%d vend_err %#x)\n",
+				   wc->status, wr_id, wc->vendor_err);
+		ipoib_ud_dma_unmap_rx(priv, priv->rx_ring[wr_id].mapping);
+		dev_kfree_skb_any(skb);
+		priv->rx_ring[wr_id].skb = NULL;
+		return;
+	}
+
+	memcpy(mapping, priv->rx_ring[wr_id].mapping,
+	       IPOIB_UD_RX_SG * sizeof(*mapping));
+
+	/*
+	 * If we can't allocate a new RX buffer, dump
+	 * this packet and reuse the old buffer.
+	 */
+	if (unlikely(!ipoib_alloc_rx_skb(dev, wr_id))) {
+		++dev->stats.rx_dropped;
+		goto repost;
+	}
+
+	ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n",
+		       wc->byte_len, wc->slid);
+
+	ipoib_ud_dma_unmap_rx(priv, mapping);
+
+	skb_put(skb, wc->byte_len);
+
+	/* First byte of dgid signals multicast when 0xff */
+	dgid = &((struct ib_grh *)skb->data)->dgid;
+
+	if (!(wc->wc_flags & IB_WC_GRH) || dgid->raw[0] != 0xff)
+		skb->pkt_type = PACKET_HOST;
+	else if (memcmp(dgid, dev->broadcast + 4, sizeof(union ib_gid)) == 0)
+		skb->pkt_type = PACKET_BROADCAST;
+	else
+		skb->pkt_type = PACKET_MULTICAST;
+
+	sgid = &((struct ib_grh *)skb->data)->sgid;
+
+	/*
+	 * Drop packets that this interface sent, ie multicast packets
+	 * that the HCA has replicated.
+	 */
+	if (wc->slid == priv->local_lid && wc->src_qp == priv->qp->qp_num) {
+		int need_repost = 1;
+
+		if ((wc->wc_flags & IB_WC_GRH) &&
+		    sgid->global.interface_id != priv->local_gid.global.interface_id)
+			need_repost = 0;
+
+		if (need_repost) {
+			dev_kfree_skb_any(skb);
+			goto repost;
+		}
+	}
+
+	skb_pull(skb, IB_GRH_BYTES);
+
+	skb->protocol = ((struct ipoib_header *) skb->data)->proto;
+	skb_add_pseudo_hdr(skb);
+
+	++dev->stats.rx_packets;
+	dev->stats.rx_bytes += skb->len;
+	if (skb->pkt_type == PACKET_MULTICAST)
+		dev->stats.multicast++;
+
+	skb->dev = dev;
+	if ((dev->features & NETIF_F_RXCSUM) &&
+			likely(wc->wc_flags & IB_WC_IP_CSUM_OK))
+		skb->ip_summed = CHECKSUM_UNNECESSARY;
+
+	napi_gro_receive(&priv->recv_napi, skb);
+
+repost:
+	if (unlikely(ipoib_ib_post_receive(dev, wr_id)))
+		ipoib_warn(priv, "ipoib_ib_post_receive failed "
+			   "for buf %d\n", wr_id);
+}
+
+int ipoib_dma_map_tx(struct ib_device *ca, struct ipoib_tx_buf *tx_req)
+{
+	struct sk_buff *skb = tx_req->skb;
+	u64 *mapping = tx_req->mapping;
+	int i;
+	int off;
+
+	if (skb_headlen(skb)) {
+		mapping[0] = ib_dma_map_single(ca, skb->data, skb_headlen(skb),
+					       DMA_TO_DEVICE);
+		if (unlikely(ib_dma_mapping_error(ca, mapping[0])))
+			return -EIO;
+
+		off = 1;
+	} else
+		off = 0;
+
+	for (i = 0; i < skb_shinfo(skb)->nr_frags; ++i) {
+		const skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
+		mapping[i + off] = ib_dma_map_page(ca,
+						 skb_frag_page(frag),
+						 skb_frag_off(frag),
+						 skb_frag_size(frag),
+						 DMA_TO_DEVICE);
+		if (unlikely(ib_dma_mapping_error(ca, mapping[i + off])))
+			goto partial_error;
+	}
+	return 0;
+
+partial_error:
+	for (; i > 0; --i) {
+		const skb_frag_t *frag = &skb_shinfo(skb)->frags[i - 1];
+
+		ib_dma_unmap_page(ca, mapping[i - !off], skb_frag_size(frag), DMA_TO_DEVICE);
+	}
+
+	if (off)
+		ib_dma_unmap_single(ca, mapping[0], skb_headlen(skb), DMA_TO_DEVICE);
+
+	return -EIO;
+}
+
+void ipoib_dma_unmap_tx(struct ipoib_dev_priv *priv,
+			struct ipoib_tx_buf *tx_req)
+{
+	struct sk_buff *skb = tx_req->skb;
+	u64 *mapping = tx_req->mapping;
+	int i;
+	int off;
+
+	if (skb_headlen(skb)) {
+		ib_dma_unmap_single(priv->ca, mapping[0], skb_headlen(skb),
+				    DMA_TO_DEVICE);
+		off = 1;
+	} else
+		off = 0;
+
+	for (i = 0; i < skb_shinfo(skb)->nr_frags; ++i) {
+		const skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
+
+		ib_dma_unmap_page(priv->ca, mapping[i + off],
+				  skb_frag_size(frag), DMA_TO_DEVICE);
+	}
+}
+
+/*
+ * As the result of a completion error the QP Can be transferred to SQE states.
+ * The function checks if the (send)QP is in SQE state and
+ * moves it back to RTS state, that in order to have it functional again.
+ */
+static void ipoib_qp_state_validate_work(struct work_struct *work)
+{
+	struct ipoib_qp_state_validate *qp_work =
+		container_of(work, struct ipoib_qp_state_validate, work);
+
+	struct ipoib_dev_priv *priv = qp_work->priv;
+	struct ib_qp_attr qp_attr;
+	struct ib_qp_init_attr query_init_attr;
+	int ret;
+
+	ret = ib_query_qp(priv->qp, &qp_attr, IB_QP_STATE, &query_init_attr);
+	if (ret) {
+		ipoib_warn(priv, "%s: Failed to query QP ret: %d\n",
+			   __func__, ret);
+		goto free_res;
+	}
+	pr_info("%s: QP: 0x%x is in state: %d\n",
+		__func__, priv->qp->qp_num, qp_attr.qp_state);
+
+	/* currently support only in SQE->RTS transition*/
+	if (qp_attr.qp_state == IB_QPS_SQE) {
+		qp_attr.qp_state = IB_QPS_RTS;
+
+		ret = ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE);
+		if (ret) {
+			pr_warn("failed(%d) modify QP:0x%x SQE->RTS\n",
+				ret, priv->qp->qp_num);
+			goto free_res;
+		}
+		pr_info("%s: QP: 0x%x moved from IB_QPS_SQE to IB_QPS_RTS\n",
+			__func__, priv->qp->qp_num);
+	} else {
+		pr_warn("QP (%d) will stay in state: %d\n",
+			priv->qp->qp_num, qp_attr.qp_state);
+	}
+
+free_res:
+	kfree(qp_work);
+}
+
+static void ipoib_ib_handle_tx_wc(struct net_device *dev, struct ib_wc *wc)
+{
+	struct ipoib_dev_priv *priv = ipoib_priv(dev);
+	unsigned int wr_id = wc->wr_id;
+	struct ipoib_tx_buf *tx_req;
+
+	ipoib_dbg_data(priv, "send completion: id %d, status: %d\n",
+		       wr_id, wc->status);
+
+	if (unlikely(wr_id >= ipoib_sendq_size)) {
+		ipoib_warn(priv, "send completion event with wrid %d (> %d)\n",
+			   wr_id, ipoib_sendq_size);
+		return;
+	}
+
+	tx_req = &priv->tx_ring[wr_id];
+
+	ipoib_dma_unmap_tx(priv, tx_req);
+
+	++dev->stats.tx_packets;
+	dev->stats.tx_bytes += tx_req->skb->len;
+
+	dev_kfree_skb_any(tx_req->skb);
+
+	++priv->tx_tail;
+	++priv->global_tx_tail;
+
+	if (unlikely(netif_queue_stopped(dev) &&
+		     ((priv->global_tx_head - priv->global_tx_tail) <=
+		      ipoib_sendq_size >> 1) &&
+		     test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)))
+		netif_wake_queue(dev);
+
+	if (wc->status != IB_WC_SUCCESS &&
+	    wc->status != IB_WC_WR_FLUSH_ERR) {
+		struct ipoib_qp_state_validate *qp_work;
+		ipoib_warn(priv,
+			   "failed send event (status=%d, wrid=%d vend_err %#x)\n",
+			   wc->status, wr_id, wc->vendor_err);
+		qp_work = kzalloc(sizeof(*qp_work), GFP_ATOMIC);
+		if (!qp_work)
+			return;
+
+		INIT_WORK(&qp_work->work, ipoib_qp_state_validate_work);
+		qp_work->priv = priv;
+		queue_work(priv->wq, &qp_work->work);
+	}
+}
+
+static int poll_tx(struct ipoib_dev_priv *priv)
+{
+	int n, i;
+	struct ib_wc *wc;
+
+	n = ib_poll_cq(priv->send_cq, MAX_SEND_CQE, priv->send_wc);
+	for (i = 0; i < n; ++i) {
+		wc = priv->send_wc + i;
+		if (wc->wr_id & IPOIB_OP_CM)
+			ipoib_cm_handle_tx_wc(priv->dev, priv->send_wc + i);
+		else
+			ipoib_ib_handle_tx_wc(priv->dev, priv->send_wc + i);
+	}
+	return n == MAX_SEND_CQE;
+}
+
+int ipoib_rx_poll(struct napi_struct *napi, int budget)
+{
+	struct ipoib_dev_priv *priv =
+		container_of(napi, struct ipoib_dev_priv, recv_napi);
+	struct net_device *dev = priv->dev;
+	int done;
+	int t;
+	int n, i;
+
+	done  = 0;
+
+poll_more:
+	while (done < budget) {
+		int max = (budget - done);
+
+		t = min(IPOIB_NUM_WC, max);
+		n = ib_poll_cq(priv->recv_cq, t, priv->ibwc);
+
+		for (i = 0; i < n; i++) {
+			struct ib_wc *wc = priv->ibwc + i;
+
+			if (wc->wr_id & IPOIB_OP_RECV) {
+				++done;
+				if (wc->wr_id & IPOIB_OP_CM)
+					ipoib_cm_handle_rx_wc(dev, wc);
+				else
+					ipoib_ib_handle_rx_wc(dev, wc);
+			} else {
+				pr_warn("%s: Got unexpected wqe id\n", __func__);
+			}
+		}
+
+		if (n != t)
+			break;
+	}
+
+	if (done < budget) {
+		napi_complete(napi);
+		if (unlikely(ib_req_notify_cq(priv->recv_cq,
+					      IB_CQ_NEXT_COMP |
+					      IB_CQ_REPORT_MISSED_EVENTS)) &&
+		    napi_reschedule(napi))
+			goto poll_more;
+	}
+
+	return done;
+}
+
+int ipoib_tx_poll(struct napi_struct *napi, int budget)
+{
+	struct ipoib_dev_priv *priv = container_of(napi, struct ipoib_dev_priv,
+						   send_napi);
+	struct net_device *dev = priv->dev;
+	int n, i;
+	struct ib_wc *wc;
+
+poll_more:
+	n = ib_poll_cq(priv->send_cq, MAX_SEND_CQE, priv->send_wc);
+
+	for (i = 0; i < n; i++) {
+		wc = priv->send_wc + i;
+		if (wc->wr_id & IPOIB_OP_CM)
+			ipoib_cm_handle_tx_wc(dev, wc);
+		else
+			ipoib_ib_handle_tx_wc(dev, wc);
+	}
+
+	if (n < budget) {
+		napi_complete(napi);
+		if (unlikely(ib_req_notify_cq(priv->send_cq, IB_CQ_NEXT_COMP |
+					      IB_CQ_REPORT_MISSED_EVENTS)) &&
+		    napi_reschedule(napi))
+			goto poll_more;
+	}
+	return n < 0 ? 0 : n;
+}
+
+void ipoib_ib_rx_completion(struct ib_cq *cq, void *ctx_ptr)
+{
+	struct ipoib_dev_priv *priv = ctx_ptr;
+
+	napi_schedule(&priv->recv_napi);
+}
+
+void ipoib_ib_tx_completion(struct ib_cq *cq, void *ctx_ptr)
+{
+	struct ipoib_dev_priv *priv = ctx_ptr;
+
+	napi_schedule(&priv->send_napi);
+}
+
+static inline int post_send(struct ipoib_dev_priv *priv,
+			    unsigned int wr_id,
+			    struct ib_ah *address, u32 dqpn,
+			    struct ipoib_tx_buf *tx_req,
+			    void *head, int hlen)
+{
+	struct sk_buff *skb = tx_req->skb;
+
+	ipoib_build_sge(priv, tx_req);
+
+	priv->tx_wr.wr.wr_id	= wr_id;
+	priv->tx_wr.remote_qpn	= dqpn;
+	priv->tx_wr.ah		= address;
+
+	if (head) {
+		priv->tx_wr.mss		= skb_shinfo(skb)->gso_size;
+		priv->tx_wr.header	= head;
+		priv->tx_wr.hlen	= hlen;
+		priv->tx_wr.wr.opcode	= IB_WR_LSO;
+	} else
+		priv->tx_wr.wr.opcode	= IB_WR_SEND;
+
+	return ib_post_send(priv->qp, &priv->tx_wr.wr, NULL);
+}
+
+int ipoib_send(struct net_device *dev, struct sk_buff *skb,
+	       struct ib_ah *address, u32 dqpn)
+{
+	struct ipoib_dev_priv *priv = ipoib_priv(dev);
+	struct ipoib_tx_buf *tx_req;
+	int hlen, rc;
+	void *phead;
+	unsigned int usable_sge = priv->max_send_sge - !!skb_headlen(skb);
+
+	if (skb_is_gso(skb)) {
+		hlen = skb_transport_offset(skb) + tcp_hdrlen(skb);
+		phead = skb->data;
+		if (unlikely(!skb_pull(skb, hlen))) {
+			ipoib_warn(priv, "linear data too small\n");
+			++dev->stats.tx_dropped;
+			++dev->stats.tx_errors;
+			dev_kfree_skb_any(skb);
+			return -1;
+		}
+	} else {
+		if (unlikely(skb->len > priv->mcast_mtu + IPOIB_ENCAP_LEN)) {
+			ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n",
+				   skb->len, priv->mcast_mtu + IPOIB_ENCAP_LEN);
+			++dev->stats.tx_dropped;
+			++dev->stats.tx_errors;
+			ipoib_cm_skb_too_long(dev, skb, priv->mcast_mtu);
+			return -1;
+		}
+		phead = NULL;
+		hlen  = 0;
+	}
+	if (skb_shinfo(skb)->nr_frags > usable_sge) {
+		if (skb_linearize(skb) < 0) {
+			ipoib_warn(priv, "skb could not be linearized\n");
+			++dev->stats.tx_dropped;
+			++dev->stats.tx_errors;
+			dev_kfree_skb_any(skb);
+			return -1;
+		}
+		/* Does skb_linearize return ok without reducing nr_frags? */
+		if (skb_shinfo(skb)->nr_frags > usable_sge) {
+			ipoib_warn(priv, "too many frags after skb linearize\n");
+			++dev->stats.tx_dropped;
+			++dev->stats.tx_errors;
+			dev_kfree_skb_any(skb);
+			return -1;
+		}
+	}
+
+	ipoib_dbg_data(priv,
+		       "sending packet, length=%d address=%p dqpn=0x%06x\n",
+		       skb->len, address, dqpn);
+
+	/*
+	 * 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 = &priv->tx_ring[priv->tx_head & (ipoib_sendq_size - 1)];
+	tx_req->skb = skb;
+	if (unlikely(ipoib_dma_map_tx(priv->ca, tx_req))) {
+		++dev->stats.tx_errors;
+		dev_kfree_skb_any(skb);
+		return -1;
+	}
+
+	if (skb->ip_summed == CHECKSUM_PARTIAL)
+		priv->tx_wr.wr.send_flags |= IB_SEND_IP_CSUM;
+	else
+		priv->tx_wr.wr.send_flags &= ~IB_SEND_IP_CSUM;
+	/* increase the tx_head after send success, but use it for queue state */
+	if ((priv->global_tx_head - priv->global_tx_tail) ==
+	    ipoib_sendq_size - 1) {
+		ipoib_dbg(priv, "TX ring full, stopping kernel net queue\n");
+		netif_stop_queue(dev);
+	}
+
+	skb_orphan(skb);
+	skb_dst_drop(skb);
+
+	if (netif_queue_stopped(dev))
+		if (ib_req_notify_cq(priv->send_cq, IB_CQ_NEXT_COMP |
+				     IB_CQ_REPORT_MISSED_EVENTS) < 0)
+			ipoib_warn(priv, "request notify on send CQ failed\n");
+
+	rc = post_send(priv, priv->tx_head & (ipoib_sendq_size - 1),
+		       address, dqpn, tx_req, phead, hlen);
+	if (unlikely(rc)) {
+		ipoib_warn(priv, "post_send failed, error %d\n", rc);
+		++dev->stats.tx_errors;
+		ipoib_dma_unmap_tx(priv, tx_req);
+		dev_kfree_skb_any(skb);
+		if (netif_queue_stopped(dev))
+			netif_wake_queue(dev);
+		rc = 0;
+	} else {
+		netif_trans_update(dev);
+
+		rc = priv->tx_head;
+		++priv->tx_head;
+		++priv->global_tx_head;
+	}
+	return rc;
+}
+
+static void ipoib_reap_dead_ahs(struct ipoib_dev_priv *priv)
+{
+	struct ipoib_ah *ah, *tah;
+	unsigned long flags;
+
+	netif_tx_lock_bh(priv->dev);
+	spin_lock_irqsave(&priv->lock, flags);
+
+	list_for_each_entry_safe(ah, tah, &priv->dead_ahs, list)
+		if ((int) priv->tx_tail - (int) ah->last_send >= 0) {
+			list_del(&ah->list);
+			rdma_destroy_ah(ah->ah, 0);
+			kfree(ah);
+		}
+
+	spin_unlock_irqrestore(&priv->lock, flags);
+	netif_tx_unlock_bh(priv->dev);
+}
+
+void ipoib_reap_ah(struct work_struct *work)
+{
+	struct ipoib_dev_priv *priv =
+		container_of(work, struct ipoib_dev_priv, ah_reap_task.work);
+
+	ipoib_reap_dead_ahs(priv);
+
+	if (!test_bit(IPOIB_STOP_REAPER, &priv->flags))
+		queue_delayed_work(priv->wq, &priv->ah_reap_task,
+				   round_jiffies_relative(HZ));
+}
+
+static void ipoib_start_ah_reaper(struct ipoib_dev_priv *priv)
+{
+	clear_bit(IPOIB_STOP_REAPER, &priv->flags);
+	queue_delayed_work(priv->wq, &priv->ah_reap_task,
+			   round_jiffies_relative(HZ));
+}
+
+static void ipoib_stop_ah_reaper(struct ipoib_dev_priv *priv)
+{
+	set_bit(IPOIB_STOP_REAPER, &priv->flags);
+	cancel_delayed_work(&priv->ah_reap_task);
+	/*
+	 * After ipoib_stop_ah_reaper() we always go through
+	 * ipoib_reap_dead_ahs() which ensures the work is really stopped and
+	 * does a final flush out of the dead_ah's list
+	 */
+}
+
+static int recvs_pending(struct net_device *dev)
+{
+	struct ipoib_dev_priv *priv = ipoib_priv(dev);
+	int pending = 0;
+	int i;
+
+	for (i = 0; i < ipoib_recvq_size; ++i)
+		if (priv->rx_ring[i].skb)
+			++pending;
+
+	return pending;
+}
+
+static void check_qp_movement_and_print(struct ipoib_dev_priv *priv,
+					struct ib_qp *qp,
+					enum ib_qp_state new_state)
+{
+	struct ib_qp_attr qp_attr;
+	struct ib_qp_init_attr query_init_attr;
+	int ret;
+
+	ret = ib_query_qp(qp, &qp_attr, IB_QP_STATE, &query_init_attr);
+	if (ret) {
+		ipoib_warn(priv, "%s: Failed to query QP\n", __func__);
+		return;
+	}
+	/* print according to the new-state and the previous state.*/
+	if (new_state == IB_QPS_ERR && qp_attr.qp_state == IB_QPS_RESET)
+		ipoib_dbg(priv, "Failed modify QP, IB_QPS_RESET to IB_QPS_ERR, acceptable\n");
+	else
+		ipoib_warn(priv, "Failed to modify QP to state: %d from state: %d\n",
+			   new_state, qp_attr.qp_state);
+}
+
+static void ipoib_napi_enable(struct net_device *dev)
+{
+	struct ipoib_dev_priv *priv = ipoib_priv(dev);
+
+	napi_enable(&priv->recv_napi);
+	napi_enable(&priv->send_napi);
+}
+
+static void ipoib_napi_disable(struct net_device *dev)
+{
+	struct ipoib_dev_priv *priv = ipoib_priv(dev);
+
+	napi_disable(&priv->recv_napi);
+	napi_disable(&priv->send_napi);
+}
+
+int ipoib_ib_dev_stop_default(struct net_device *dev)
+{
+	struct ipoib_dev_priv *priv = ipoib_priv(dev);
+	struct ib_qp_attr qp_attr;
+	unsigned long begin;
+	struct ipoib_tx_buf *tx_req;
+	int i;
+
+	if (test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags))
+		ipoib_napi_disable(dev);
+
+	ipoib_cm_dev_stop(dev);
+
+	/*
+	 * Move our QP to the error state and then reinitialize in
+	 * when all work requests have completed or have been flushed.
+	 */
+	qp_attr.qp_state = IB_QPS_ERR;
+	if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
+		check_qp_movement_and_print(priv, priv->qp, IB_QPS_ERR);
+
+	/* Wait for all sends and receives to complete */
+	begin = jiffies;
+
+	while (priv->tx_head != priv->tx_tail || recvs_pending(dev)) {
+		if (time_after(jiffies, begin + 5 * HZ)) {
+			ipoib_warn(priv,
+				   "timing out; %d sends %d receives not completed\n",
+				   priv->tx_head - priv->tx_tail,
+				   recvs_pending(dev));
+
+			/*
+			 * assume the HW is wedged and just free up
+			 * all our pending work requests.
+			 */
+			while ((int)priv->tx_tail - (int)priv->tx_head < 0) {
+				tx_req = &priv->tx_ring[priv->tx_tail &
+							(ipoib_sendq_size - 1)];
+				ipoib_dma_unmap_tx(priv, tx_req);
+				dev_kfree_skb_any(tx_req->skb);
+				++priv->tx_tail;
+				++priv->global_tx_tail;
+			}
+
+			for (i = 0; i < ipoib_recvq_size; ++i) {
+				struct ipoib_rx_buf *rx_req;
+
+				rx_req = &priv->rx_ring[i];
+				if (!rx_req->skb)
+					continue;
+				ipoib_ud_dma_unmap_rx(priv,
+						      priv->rx_ring[i].mapping);
+				dev_kfree_skb_any(rx_req->skb);
+				rx_req->skb = NULL;
+			}
+
+			goto timeout;
+		}
+
+		ipoib_drain_cq(dev);
+
+		usleep_range(1000, 2000);
+	}
+
+	ipoib_dbg(priv, "All sends and receives done.\n");
+
+timeout:
+	qp_attr.qp_state = IB_QPS_RESET;
+	if (ib_modify_qp(priv->qp, &qp_attr, IB_QP_STATE))
+		ipoib_warn(priv, "Failed to modify QP to RESET state\n");
+
+	ib_req_notify_cq(priv->recv_cq, IB_CQ_NEXT_COMP);
+
+	return 0;
+}
+
+int ipoib_ib_dev_open_default(struct net_device *dev)
+{
+	struct ipoib_dev_priv *priv = ipoib_priv(dev);
+	int ret;
+
+	ret = ipoib_init_qp(dev);
+	if (ret) {
+		ipoib_warn(priv, "ipoib_init_qp returned %d\n", ret);
+		return -1;
+	}
+
+	ret = ipoib_ib_post_receives(dev);
+	if (ret) {
+		ipoib_warn(priv, "ipoib_ib_post_receives returned %d\n", ret);
+		goto out;
+	}
+
+	ret = ipoib_cm_dev_open(dev);
+	if (ret) {
+		ipoib_warn(priv, "ipoib_cm_dev_open returned %d\n", ret);
+		goto out;
+	}
+
+	if (!test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags))
+		ipoib_napi_enable(dev);
+
+	return 0;
+out:
+	return -1;
+}
+
+int ipoib_ib_dev_open(struct net_device *dev)
+{
+	struct ipoib_dev_priv *priv = ipoib_priv(dev);
+
+	ipoib_pkey_dev_check_presence(dev);
+
+	if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
+		ipoib_warn(priv, "P_Key 0x%04x is %s\n", priv->pkey,
+			   (!(priv->pkey & 0x7fff) ? "Invalid" : "not found"));
+		return -1;
+	}
+
+	ipoib_start_ah_reaper(priv);
+	if (priv->rn_ops->ndo_open(dev)) {
+		pr_warn("%s: Failed to open dev\n", dev->name);
+		goto dev_stop;
+	}
+
+	set_bit(IPOIB_FLAG_INITIALIZED, &priv->flags);
+
+	return 0;
+
+dev_stop:
+	ipoib_stop_ah_reaper(priv);
+	return -1;
+}
+
+void ipoib_ib_dev_stop(struct net_device *dev)
+{
+	struct ipoib_dev_priv *priv = ipoib_priv(dev);
+
+	priv->rn_ops->ndo_stop(dev);
+
+	clear_bit(IPOIB_FLAG_INITIALIZED, &priv->flags);
+	ipoib_stop_ah_reaper(priv);
+}
+
+void ipoib_pkey_dev_check_presence(struct net_device *dev)
+{
+	struct ipoib_dev_priv *priv = ipoib_priv(dev);
+	struct rdma_netdev *rn = netdev_priv(dev);
+
+	if (!(priv->pkey & 0x7fff) ||
+	    ib_find_pkey(priv->ca, priv->port, priv->pkey,
+			 &priv->pkey_index)) {
+		clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
+	} else {
+		if (rn->set_id)
+			rn->set_id(dev, priv->pkey_index);
+		set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
+	}
+}
+
+void ipoib_ib_dev_up(struct net_device *dev)
+{
+	struct ipoib_dev_priv *priv = ipoib_priv(dev);
+
+	ipoib_pkey_dev_check_presence(dev);
+
+	if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
+		ipoib_dbg(priv, "PKEY is not assigned.\n");
+		return;
+	}
+
+	set_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
+
+	ipoib_mcast_start_thread(dev);
+}
+
+void ipoib_ib_dev_down(struct net_device *dev)
+{
+	struct ipoib_dev_priv *priv = ipoib_priv(dev);
+
+	ipoib_dbg(priv, "downing ib_dev\n");
+
+	clear_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
+	netif_carrier_off(dev);
+
+	ipoib_mcast_stop_thread(dev);
+	ipoib_mcast_dev_flush(dev);
+
+	ipoib_flush_paths(dev);
+}
+
+void ipoib_drain_cq(struct net_device *dev)
+{
+	struct ipoib_dev_priv *priv = ipoib_priv(dev);
+	int i, n;
+
+	/*
+	 * We call completion handling routines that expect to be
+	 * called from the BH-disabled NAPI poll context, so disable
+	 * BHs here too.
+	 */
+	local_bh_disable();
+
+	do {
+		n = ib_poll_cq(priv->recv_cq, IPOIB_NUM_WC, priv->ibwc);
+		for (i = 0; i < n; ++i) {
+			/*
+			 * Convert any successful completions to flush
+			 * errors to avoid passing packets up the
+			 * stack after bringing the device down.
+			 */
+			if (priv->ibwc[i].status == IB_WC_SUCCESS)
+				priv->ibwc[i].status = IB_WC_WR_FLUSH_ERR;
+
+			if (priv->ibwc[i].wr_id & IPOIB_OP_RECV) {
+				if (priv->ibwc[i].wr_id & IPOIB_OP_CM)
+					ipoib_cm_handle_rx_wc(dev, priv->ibwc + i);
+				else
+					ipoib_ib_handle_rx_wc(dev, priv->ibwc + i);
+			} else {
+				pr_warn("%s: Got unexpected wqe id\n", __func__);
+			}
+		}
+	} while (n == IPOIB_NUM_WC);
+
+	while (poll_tx(priv))
+		; /* nothing */
+
+	local_bh_enable();
+}
+
+/*
+ * Takes whatever value which is in pkey index 0 and updates priv->pkey
+ * returns 0 if the pkey value was changed.
+ */
+static inline int update_parent_pkey(struct ipoib_dev_priv *priv)
+{
+	int result;
+	u16 prev_pkey;
+
+	prev_pkey = priv->pkey;
+	result = ib_query_pkey(priv->ca, priv->port, 0, &priv->pkey);
+	if (result) {
+		ipoib_warn(priv, "ib_query_pkey port %d failed (ret = %d)\n",
+			   priv->port, result);
+		return result;
+	}
+
+	priv->pkey |= 0x8000;
+
+	if (prev_pkey != priv->pkey) {
+		ipoib_dbg(priv, "pkey changed from 0x%x to 0x%x\n",
+			  prev_pkey, priv->pkey);
+		/*
+		 * Update the pkey in the broadcast address, while making sure to set
+		 * the full membership bit, so that we join the right broadcast group.
+		 */
+		priv->dev->broadcast[8] = priv->pkey >> 8;
+		priv->dev->broadcast[9] = priv->pkey & 0xff;
+		return 0;
+	}
+
+	return 1;
+}
+/*
+ * returns 0 if pkey value was found in a different slot.
+ */
+static inline int update_child_pkey(struct ipoib_dev_priv *priv)
+{
+	u16 old_index = priv->pkey_index;
+
+	priv->pkey_index = 0;
+	ipoib_pkey_dev_check_presence(priv->dev);
+
+	if (test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags) &&
+	    (old_index == priv->pkey_index))
+		return 1;
+	return 0;
+}
+
+/*
+ * returns true if the device address of the ipoib interface has changed and the
+ * new address is a valid one (i.e in the gid table), return false otherwise.
+ */
+static bool ipoib_dev_addr_changed_valid(struct ipoib_dev_priv *priv)
+{
+	union ib_gid search_gid;
+	union ib_gid gid0;
+	union ib_gid *netdev_gid;
+	int err;
+	u16 index;
+	u8 port;
+	bool ret = false;
+
+	netdev_gid = (union ib_gid *)(priv->dev->dev_addr + 4);
+	if (rdma_query_gid(priv->ca, priv->port, 0, &gid0))
+		return false;
+
+	netif_addr_lock_bh(priv->dev);
+
+	/* The subnet prefix may have changed, update it now so we won't have
+	 * to do it later
+	 */
+	priv->local_gid.global.subnet_prefix = gid0.global.subnet_prefix;
+	netdev_gid->global.subnet_prefix = gid0.global.subnet_prefix;
+	search_gid.global.subnet_prefix = gid0.global.subnet_prefix;
+
+	search_gid.global.interface_id = priv->local_gid.global.interface_id;
+
+	netif_addr_unlock_bh(priv->dev);
+
+	err = ib_find_gid(priv->ca, &search_gid, &port, &index);
+
+	netif_addr_lock_bh(priv->dev);
+
+	if (search_gid.global.interface_id !=
+	    priv->local_gid.global.interface_id)
+		/* There was a change while we were looking up the gid, bail
+		 * here and let the next work sort this out
+		 */
+		goto out;
+
+	/* The next section of code needs some background:
+	 * Per IB spec the port GUID can't change if the HCA is powered on.
+	 * port GUID is the basis for GID at index 0 which is the basis for
+	 * the default device address of a ipoib interface.
+	 *
+	 * so it seems the flow should be:
+	 * if user_changed_dev_addr && gid in gid tbl
+	 *	set bit dev_addr_set
+	 *	return true
+	 * else
+	 *	return false
+	 *
+	 * The issue is that there are devices that don't follow the spec,
+	 * they change the port GUID when the HCA is powered, so in order
+	 * not to break userspace applications, We need to check if the
+	 * user wanted to control the device address and we assume that
+	 * if he sets the device address back to be based on GID index 0,
+	 * he no longer wishs to control it.
+	 *
+	 * If the user doesn't control the the device address,
+	 * IPOIB_FLAG_DEV_ADDR_SET is set and ib_find_gid failed it means
+	 * the port GUID has changed and GID at index 0 has changed
+	 * so we need to change priv->local_gid and priv->dev->dev_addr
+	 * to reflect the new GID.
+	 */
+	if (!test_bit(IPOIB_FLAG_DEV_ADDR_SET, &priv->flags)) {
+		if (!err && port == priv->port) {
+			set_bit(IPOIB_FLAG_DEV_ADDR_SET, &priv->flags);
+			if (index == 0)
+				clear_bit(IPOIB_FLAG_DEV_ADDR_CTRL,
+					  &priv->flags);
+			else
+				set_bit(IPOIB_FLAG_DEV_ADDR_CTRL, &priv->flags);
+			ret = true;
+		} else {
+			ret = false;
+		}
+	} else {
+		if (!err && port == priv->port) {
+			ret = true;
+		} else {
+			if (!test_bit(IPOIB_FLAG_DEV_ADDR_CTRL, &priv->flags)) {
+				memcpy(&priv->local_gid, &gid0,
+				       sizeof(priv->local_gid));
+				memcpy(priv->dev->dev_addr + 4, &gid0,
+				       sizeof(priv->local_gid));
+				ret = true;
+			}
+		}
+	}
+
+out:
+	netif_addr_unlock_bh(priv->dev);
+
+	return ret;
+}
+
+static void __ipoib_ib_dev_flush(struct ipoib_dev_priv *priv,
+				enum ipoib_flush_level level,
+				int nesting)
+{
+	struct ipoib_dev_priv *cpriv;
+	struct net_device *dev = priv->dev;
+	int result;
+
+	down_read_nested(&priv->vlan_rwsem, nesting);
+
+	/*
+	 * Flush any child interfaces too -- they might be up even if
+	 * the parent is down.
+	 */
+	list_for_each_entry(cpriv, &priv->child_intfs, list)
+		__ipoib_ib_dev_flush(cpriv, level, nesting + 1);
+
+	up_read(&priv->vlan_rwsem);
+
+	if (!test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags) &&
+	    level != IPOIB_FLUSH_HEAVY) {
+		/* Make sure the dev_addr is set even if not flushing */
+		if (level == IPOIB_FLUSH_LIGHT)
+			ipoib_dev_addr_changed_valid(priv);
+		ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_INITIALIZED not set.\n");
+		return;
+	}
+
+	if (!test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) {
+		/* interface is down. update pkey and leave. */
+		if (level == IPOIB_FLUSH_HEAVY) {
+			if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags))
+				update_parent_pkey(priv);
+			else
+				update_child_pkey(priv);
+		} else if (level == IPOIB_FLUSH_LIGHT)
+			ipoib_dev_addr_changed_valid(priv);
+		ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_ADMIN_UP not set.\n");
+		return;
+	}
+
+	if (level == IPOIB_FLUSH_HEAVY) {
+		/* child devices chase their origin pkey value, while non-child
+		 * (parent) devices should always takes what present in pkey index 0
+		 */
+		if (test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
+			result = update_child_pkey(priv);
+			if (result) {
+				/* restart QP only if P_Key index is changed */
+				ipoib_dbg(priv, "Not flushing - P_Key index not changed.\n");
+				return;
+			}
+
+		} else {
+			result = update_parent_pkey(priv);
+			/* restart QP only if P_Key value changed */
+			if (result) {
+				ipoib_dbg(priv, "Not flushing - P_Key value not changed.\n");
+				return;
+			}
+		}
+	}
+
+	if (level == IPOIB_FLUSH_LIGHT) {
+		int oper_up;
+		ipoib_mark_paths_invalid(dev);
+		/* Set IPoIB operation as down to prevent races between:
+		 * the flush flow which leaves MCG and on the fly joins
+		 * which can happen during that time. mcast restart task
+		 * should deal with join requests we missed.
+		 */
+		oper_up = test_and_clear_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
+		ipoib_mcast_dev_flush(dev);
+		if (oper_up)
+			set_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
+		ipoib_reap_dead_ahs(priv);
+	}
+
+	if (level >= IPOIB_FLUSH_NORMAL)
+		ipoib_ib_dev_down(dev);
+
+	if (level == IPOIB_FLUSH_HEAVY) {
+		if (test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags))
+			ipoib_ib_dev_stop(dev);
+
+		if (ipoib_ib_dev_open(dev))
+			return;
+
+		if (netif_queue_stopped(dev))
+			netif_start_queue(dev);
+	}
+
+	/*
+	 * The device could have been brought down between the start and when
+	 * we get here, don't bring it back up if it's not configured up
+	 */
+	if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) {
+		if (level >= IPOIB_FLUSH_NORMAL)
+			ipoib_ib_dev_up(dev);
+		if (ipoib_dev_addr_changed_valid(priv))
+			ipoib_mcast_restart_task(&priv->restart_task);
+	}
+}
+
+void ipoib_ib_dev_flush_light(struct work_struct *work)
+{
+	struct ipoib_dev_priv *priv =
+		container_of(work, struct ipoib_dev_priv, flush_light);
+
+	__ipoib_ib_dev_flush(priv, IPOIB_FLUSH_LIGHT, 0);
+}
+
+void ipoib_ib_dev_flush_normal(struct work_struct *work)
+{
+	struct ipoib_dev_priv *priv =
+		container_of(work, struct ipoib_dev_priv, flush_normal);
+
+	__ipoib_ib_dev_flush(priv, IPOIB_FLUSH_NORMAL, 0);
+}
+
+void ipoib_ib_dev_flush_heavy(struct work_struct *work)
+{
+	struct ipoib_dev_priv *priv =
+		container_of(work, struct ipoib_dev_priv, flush_heavy);
+
+	rtnl_lock();
+	__ipoib_ib_dev_flush(priv, IPOIB_FLUSH_HEAVY, 0);
+	rtnl_unlock();
+}
+
+void ipoib_ib_dev_cleanup(struct net_device *dev)
+{
+	struct ipoib_dev_priv *priv = ipoib_priv(dev);
+
+	ipoib_dbg(priv, "cleaning up ib_dev\n");
+	/*
+	 * We must make sure there are no more (path) completions
+	 * that may wish to touch priv fields that are no longer valid
+	 */
+	ipoib_flush_paths(dev);
+
+	ipoib_mcast_stop_thread(dev);
+	ipoib_mcast_dev_flush(dev);
+
+	/*
+	 * All of our ah references aren't free until after
+	 * ipoib_mcast_dev_flush(), ipoib_flush_paths, and
+	 * the neighbor garbage collection is stopped and reaped.
+	 * That should all be done now, so make a final ah flush.
+	 */
+	ipoib_reap_dead_ahs(priv);
+
+	clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
+
+	priv->rn_ops->ndo_uninit(dev);
+
+	if (priv->pd) {
+		ib_dealloc_pd(priv->pd);
+		priv->pd = NULL;
+	}
+}
+