drivers/infiniband/ulp/ipoib/ipoib_ib.c - maze/linux - Git at Google

 /*
  * 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.
  *
  * $Id: ipoib_ib.c 1386 2004-12-27 16:23:17Z roland $
  */

 #include <linux/delay.h>
 #include <linux/dma-mapping.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

 #define	IPOIB_OP_RECV	(1ul << 31)

 static DEFINE_MUTEX(pkey_mutex);

 struct ipoib_ah *ipoib_create_ah(struct net_device *dev,
 				 struct ib_pd *pd, struct ib_ah_attr *attr)
 {
 	struct ipoib_ah *ah;

 	ah = kmalloc(sizeof *ah, GFP_KERNEL);
 	if (!ah)
 		return NULL;

 	ah->dev       = dev;
 	ah->last_send = 0;
 	kref_init(&ah->ref);

 	ah->ah = ib_create_ah(pd, attr);
 	if (IS_ERR(ah->ah)) {
 		kfree(ah);
 		ah = NULL;
 	} else
 		ipoib_dbg(netdev_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 = netdev_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 int ipoib_ib_post_receive(struct net_device *dev, int id)
 {
 	struct ipoib_dev_priv *priv = netdev_priv(dev);
 	struct ib_sge list;
 	struct ib_recv_wr param;
 	struct ib_recv_wr *bad_wr;
 	int ret;

 	list.addr     = priv->rx_ring[id].mapping;
 	list.length   = IPOIB_BUF_SIZE;
 	list.lkey     = priv->mr->lkey;

 	param.next    = NULL;
 	param.wr_id   = id | IPOIB_OP_RECV;
 	param.sg_list = &list;
 	param.num_sge = 1;

 	ret = ib_post_recv(priv->qp, &param, &bad_wr);
 	if (unlikely(ret)) {
 		ipoib_warn(priv, "receive failed for buf %d (%d)\n", id, ret);
 		ib_dma_unmap_single(priv->ca, priv->rx_ring[id].mapping,
 				    IPOIB_BUF_SIZE, DMA_FROM_DEVICE);
 		dev_kfree_skb_any(priv->rx_ring[id].skb);
 		priv->rx_ring[id].skb = NULL;
 	}

 	return ret;
 }

 static int ipoib_alloc_rx_skb(struct net_device *dev, int id)
 {
 	struct ipoib_dev_priv *priv = netdev_priv(dev);
 	struct sk_buff *skb;
 	u64 addr;

 	skb = dev_alloc_skb(IPOIB_BUF_SIZE + 4);
 	if (!skb)
 		return -ENOMEM;

 	/*
 	 * IB will leave a 40 byte gap for a GRH and IPoIB adds a 4 byte
 	 * header.  So we need 4 more bytes to get to 48 and align the
 	 * IP header to a multiple of 16.
 	 */
 	skb_reserve(skb, 4);

 	addr = ib_dma_map_single(priv->ca, skb->data, IPOIB_BUF_SIZE,
 				 DMA_FROM_DEVICE);
 	if (unlikely(ib_dma_mapping_error(priv->ca, addr))) {
 		dev_kfree_skb_any(skb);
 		return -EIO;
 	}

 	priv->rx_ring[id].skb     = skb;
 	priv->rx_ring[id].mapping = addr;

 	return 0;
 }

 static int ipoib_ib_post_receives(struct net_device *dev)
 {
 	struct ipoib_dev_priv *priv = netdev_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 = netdev_priv(dev);
 	unsigned int wr_id = wc->wr_id & ~IPOIB_OP_RECV;
 	struct sk_buff *skb;
 	u64 addr;

 	ipoib_dbg_data(priv, "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, "recv completion event with wrid %d (> %d)\n",
 			   wr_id, ipoib_recvq_size);
 		return;
 	}

 	skb  = priv->rx_ring[wr_id].skb;
 	addr = priv->rx_ring[wr_id].mapping;

 	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);
 		ib_dma_unmap_single(priv->ca, addr,
 				    IPOIB_BUF_SIZE, DMA_FROM_DEVICE);
 		dev_kfree_skb_any(skb);
 		priv->rx_ring[wr_id].skb = NULL;
 		return;
 	}

 	/*
 	 * 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))) {
 		++priv->stats.rx_dropped;
 		goto repost;
 	}

 	ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n",
 		       wc->byte_len, wc->slid);

 	ib_dma_unmap_single(priv->ca, addr, IPOIB_BUF_SIZE, DMA_FROM_DEVICE);

 	skb_put(skb, wc->byte_len);
 	skb_pull(skb, IB_GRH_BYTES);

 	if (wc->slid != priv->local_lid ||
 	    wc->src_qp != priv->qp->qp_num) {
 		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);
 	} else {
 		ipoib_dbg_data(priv, "dropping loopback packet\n");
 		dev_kfree_skb_any(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);
 }

 static void ipoib_ib_handle_tx_wc(struct net_device *dev, 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, "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, "send completion event with wrid %d (> %d)\n",
 			   wr_id, ipoib_sendq_size);
 		return;
 	}

 	tx_req = &priv->tx_ring[wr_id];

 	ib_dma_unmap_single(priv->ca, tx_req->mapping,
 			    tx_req->skb->len, DMA_TO_DEVICE);

 	++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);
 	++priv->tx_tail;
 	if (netif_queue_stopped(dev) &&
 	    test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags) &&
 	    priv->tx_head - priv->tx_tail <= ipoib_sendq_size >> 1)
 		netif_wake_queue(dev);
 	spin_unlock_irqrestore(&priv->tx_lock, flags);

 	if (wc->status != IB_WC_SUCCESS &&
 	    wc->status != IB_WC_WR_FLUSH_ERR)
 		ipoib_warn(priv, "failed send event "
 			   "(status=%d, wrid=%d vend_err %x)\n",
 			   wc->status, wr_id, wc->vendor_err);
 }

 static void ipoib_ib_handle_wc(struct net_device *dev, struct ib_wc *wc)
 {
 	if (wc->wr_id & IPOIB_OP_RECV)
 		ipoib_ib_handle_rx_wc(dev, wc);
 	else
 		ipoib_ib_handle_tx_wc(dev, wc);
 }

 void ipoib_ib_completion(struct ib_cq *cq, void *dev_ptr)
 {
 	struct net_device *dev = (struct net_device *) dev_ptr;
 	struct ipoib_dev_priv *priv = netdev_priv(dev);
 	int n, i;

 	ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
 	do {
 		n = ib_poll_cq(cq, IPOIB_NUM_WC, priv->ibwc);
 		for (i = 0; i < n; ++i)
 			ipoib_ib_handle_wc(dev, priv->ibwc + i);
 	} while (n == IPOIB_NUM_WC);
 }

 static inline int post_send(struct ipoib_dev_priv *priv,
 			    unsigned int wr_id,
 			    struct ib_ah *address, u32 qpn,
 			    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;
 	priv->tx_wr.wr.ud.remote_qpn  = qpn;
 	priv->tx_wr.wr.ud.ah 	      = address;

 	return ib_post_send(priv->qp, &priv->tx_wr, &bad_wr);
 }

 void ipoib_send(struct net_device *dev, struct sk_buff *skb,
 		struct ipoib_ah *address, u32 qpn)
 {
 	struct ipoib_dev_priv *priv = netdev_priv(dev);
 	struct ipoib_tx_buf *tx_req;
 	u64 addr;

 	if (unlikely(skb->len > dev->mtu + INFINIBAND_ALEN)) {
 		ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n",
 			   skb->len, dev->mtu + INFINIBAND_ALEN);
 		++priv->stats.tx_dropped;
 		++priv->stats.tx_errors;
 		dev_kfree_skb_any(skb);
 		return;
 	}

 	ipoib_dbg_data(priv, "sending packet, length=%d address=%p qpn=0x%06x\n",
 		       skb->len, address, qpn);

 	/*
 	 * 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;
 	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, priv->tx_head & (ipoib_sendq_size - 1),
 			       address->ah, qpn, 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;

 		address->last_send = priv->tx_head;
 		++priv->tx_head;

 		if (priv->tx_head - priv->tx_tail == ipoib_sendq_size) {
 			ipoib_dbg(priv, "TX ring full, stopping kernel net queue\n");
 			netif_stop_queue(dev);
 		}
 	}
 }

 static void __ipoib_reap_ah(struct net_device *dev)
 {
 	struct ipoib_dev_priv *priv = netdev_priv(dev);
 	struct ipoib_ah *ah, *tah;
 	LIST_HEAD(remove_list);

 	spin_lock_irq(&priv->tx_lock);
 	spin_lock(&priv->lock);
 	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);
 			ib_destroy_ah(ah->ah);
 			kfree(ah);
 		}
 	spin_unlock(&priv->lock);
 	spin_unlock_irq(&priv->tx_lock);
 }

 void ipoib_reap_ah(struct work_struct *work)
 {
 	struct ipoib_dev_priv *priv =
 		container_of(work, struct ipoib_dev_priv, ah_reap_task.work);
 	struct net_device *dev = priv->dev;

 	__ipoib_reap_ah(dev);

 	if (!test_bit(IPOIB_STOP_REAPER, &priv->flags))
 		queue_delayed_work(ipoib_workqueue, &priv->ah_reap_task, HZ);
 }

 int ipoib_ib_dev_open(struct net_device *dev)
 {
 	struct ipoib_dev_priv *priv = netdev_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);
 		ipoib_ib_dev_stop(dev);
 		return -1;
 	}

 	clear_bit(IPOIB_STOP_REAPER, &priv->flags);
 	queue_delayed_work(ipoib_workqueue, &priv->ah_reap_task, HZ);

 	set_bit(IPOIB_FLAG_INITIALIZED, &priv->flags);

 	return 0;
 }

 static void ipoib_pkey_dev_check_presence(struct net_device *dev)
 {
 	struct ipoib_dev_priv *priv = netdev_priv(dev);
 	u16 pkey_index = 0;

 	if (ib_find_cached_pkey(priv->ca, priv->port, priv->pkey, &pkey_index))
 		clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 	else
 		set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 }

 int ipoib_ib_dev_up(struct net_device *dev)
 {
 	struct ipoib_dev_priv *priv = netdev_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 0;
 	}

 	set_bit(IPOIB_FLAG_OPER_UP, &priv->flags);

 	return ipoib_mcast_start_thread(dev);
 }

 int ipoib_ib_dev_down(struct net_device *dev, int flush)
 {
 	struct ipoib_dev_priv *priv = netdev_priv(dev);

 	ipoib_dbg(priv, "downing ib_dev\n");

 	clear_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
 	netif_carrier_off(dev);

 	/* Shutdown the P_Key thread if still active */
 	if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
 		mutex_lock(&pkey_mutex);
 		set_bit(IPOIB_PKEY_STOP, &priv->flags);
 		cancel_delayed_work(&priv->pkey_task);
 		mutex_unlock(&pkey_mutex);
 		if (flush)
 			flush_workqueue(ipoib_workqueue);
 	}

 	ipoib_mcast_stop_thread(dev, flush);
 	ipoib_mcast_dev_flush(dev);

 	ipoib_flush_paths(dev);

 	return 0;
 }

 static int recvs_pending(struct net_device *dev)
 {
 	struct ipoib_dev_priv *priv = netdev_priv(dev);
 	int pending = 0;
 	int i;

 	for (i = 0; i < ipoib_recvq_size; ++i)
 		if (priv->rx_ring[i].skb)
 			++pending;

 	return pending;
 }

 int ipoib_ib_dev_stop(struct net_device *dev)
 {
 	struct ipoib_dev_priv *priv = netdev_priv(dev);
 	struct ib_qp_attr qp_attr;
 	unsigned long begin;
 	struct ipoib_tx_buf *tx_req;
 	int i;

 	clear_bit(IPOIB_FLAG_INITIALIZED, &priv->flags);

 	/*
 	 * 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))
 		ipoib_warn(priv, "Failed to modify QP to ERROR state\n");

 	/* 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)];
 				ib_dma_unmap_single(priv->ca,
 						    tx_req->mapping,
 						    tx_req->skb->len,
 						    DMA_TO_DEVICE);
 				dev_kfree_skb_any(tx_req->skb);
 				++priv->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;
 				ib_dma_unmap_single(priv->ca,
 						    rx_req->mapping,
 						    IPOIB_BUF_SIZE,
 						    DMA_FROM_DEVICE);
 				dev_kfree_skb_any(rx_req->skb);
 				rx_req->skb = NULL;
 			}

 			goto timeout;
 		}

 		msleep(1);
 	}

 	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");

 	/* Wait for all AHs to be reaped */
 	set_bit(IPOIB_STOP_REAPER, &priv->flags);
 	cancel_delayed_work(&priv->ah_reap_task);
 	flush_workqueue(ipoib_workqueue);

 	begin = jiffies;

 	while (!list_empty(&priv->dead_ahs)) {
 		__ipoib_reap_ah(dev);

 		if (time_after(jiffies, begin + HZ)) {
 			ipoib_warn(priv, "timing out; will leak address handles\n");
 			break;
 		}

 		msleep(1);
 	}

 	return 0;
 }

 int ipoib_ib_dev_init(struct net_device *dev, struct ib_device *ca, int port)
 {
 	struct ipoib_dev_priv *priv = netdev_priv(dev);

 	priv->ca = ca;
 	priv->port = port;
 	priv->qp = NULL;

 	if (ipoib_transport_dev_init(dev, ca)) {
 		printk(KERN_WARNING "%s: ipoib_transport_dev_init failed\n", ca->name);
 		return -ENODEV;
 	}

 	if (dev->flags & IFF_UP) {
 		if (ipoib_ib_dev_open(dev)) {
 			ipoib_transport_dev_cleanup(dev);
 			return -ENODEV;
 		}
 	}

 	return 0;
 }

 void ipoib_ib_dev_flush(struct work_struct *work)
 {
 	struct ipoib_dev_priv *cpriv, *priv =
 		container_of(work, struct ipoib_dev_priv, flush_task);
 	struct net_device *dev = priv->dev;

 	if (!test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags) ) {
 		ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_INITIALIZED not set.\n");
 		return;
 	}

 	if (!test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) {
 		ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_ADMIN_UP not set.\n");
 		return;
 	}

 	ipoib_dbg(priv, "flushing\n");

 	ipoib_ib_dev_down(dev, 0);

 	/*
 	 * 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)) {
 		ipoib_ib_dev_up(dev);
 		ipoib_mcast_restart_task(&priv->restart_task);
 	}

 	mutex_lock(&priv->vlan_mutex);

 	/* Flush any child interfaces too */
 	list_for_each_entry(cpriv, &priv->child_intfs, list)
 		ipoib_ib_dev_flush(&cpriv->flush_task);

 	mutex_unlock(&priv->vlan_mutex);
 }

 void ipoib_ib_dev_cleanup(struct net_device *dev)
 {
 	struct ipoib_dev_priv *priv = netdev_priv(dev);

 	ipoib_dbg(priv, "cleaning up ib_dev\n");

 	ipoib_mcast_stop_thread(dev, 1);
 	ipoib_mcast_dev_flush(dev);

 	ipoib_transport_dev_cleanup(dev);
 }

 /*
  * Delayed P_Key Assigment Interim Support
  *
  * The following is initial implementation of delayed P_Key assigment
  * mechanism. It is using the same approach implemented for the multicast
  * group join. The single goal of this implementation is to quickly address
  * Bug #2507. This implementation will probably be removed when the P_Key
  * change async notification is available.
  */

 void ipoib_pkey_poll(struct work_struct *work)
 {
 	struct ipoib_dev_priv *priv =
 		container_of(work, struct ipoib_dev_priv, pkey_task.work);
 	struct net_device *dev = priv->dev;

 	ipoib_pkey_dev_check_presence(dev);

 	if (test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags))
 		ipoib_open(dev);
 	else {
 		mutex_lock(&pkey_mutex);
 		if (!test_bit(IPOIB_PKEY_STOP, &priv->flags))
 			queue_delayed_work(ipoib_workqueue,
 					   &priv->pkey_task,
 					   HZ);
 		mutex_unlock(&pkey_mutex);
 	}
 }

 int ipoib_pkey_dev_delay_open(struct net_device *dev)
 {
 	struct ipoib_dev_priv *priv = netdev_priv(dev);

 	/* Look for the interface pkey value in the IB Port P_Key table and */
 	/* set the interface pkey assigment flag                            */
 	ipoib_pkey_dev_check_presence(dev);

 	/* P_Key value not assigned yet - start polling */
 	if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
 		mutex_lock(&pkey_mutex);
 		clear_bit(IPOIB_PKEY_STOP, &priv->flags);
 		queue_delayed_work(ipoib_workqueue,
 				   &priv->pkey_task,
 				   HZ);
 		mutex_unlock(&pkey_mutex);
 		return 1;
 	}

 	return 0;
 }
	/*
	* 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.
	*
	* $Id: ipoib_ib.c 1386 2004-12-27 16:23:17Z roland $
	*/

	#include <linux/delay.h>
	#include <linux/dma-mapping.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

	#define IPOIB_OP_RECV (1ul << 31)

	static DEFINE_MUTEX(pkey_mutex);

	struct ipoib_ah ipoib_create_ah(struct net_device dev,
	struct ib_pd pd, struct ib_ah_attr attr)
	{
	struct ipoib_ah *ah;

	ah = kmalloc(sizeof *ah, GFP_KERNEL);
	if (!ah)
	return NULL;

	ah->dev = dev;
	ah->last_send = 0;
	kref_init(&ah->ref);

	ah->ah = ib_create_ah(pd, attr);
	if (IS_ERR(ah->ah)) {
	kfree(ah);
	ah = NULL;
	} else
	ipoib_dbg(netdev_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 = netdev_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 int ipoib_ib_post_receive(struct net_device *dev, int id)
	{
	struct ipoib_dev_priv *priv = netdev_priv(dev);
	struct ib_sge list;
	struct ib_recv_wr param;
	struct ib_recv_wr *bad_wr;
	int ret;

	list.addr = priv->rx_ring[id].mapping;
	list.length = IPOIB_BUF_SIZE;
	list.lkey = priv->mr->lkey;

	param.next = NULL;
	param.wr_id = id \| IPOIB_OP_RECV;
	param.sg_list = &list;
	param.num_sge = 1;

	ret = ib_post_recv(priv->qp, &param, &bad_wr);
	if (unlikely(ret)) {
	ipoib_warn(priv, "receive failed for buf %d (%d)\n", id, ret);
	ib_dma_unmap_single(priv->ca, priv->rx_ring[id].mapping,
	IPOIB_BUF_SIZE, DMA_FROM_DEVICE);
	dev_kfree_skb_any(priv->rx_ring[id].skb);
	priv->rx_ring[id].skb = NULL;
	}

	return ret;
	}

	static int ipoib_alloc_rx_skb(struct net_device *dev, int id)
	{
	struct ipoib_dev_priv *priv = netdev_priv(dev);
	struct sk_buff *skb;
	u64 addr;

	skb = dev_alloc_skb(IPOIB_BUF_SIZE + 4);
	if (!skb)
	return -ENOMEM;

	/*
	* IB will leave a 40 byte gap for a GRH and IPoIB adds a 4 byte
	* header. So we need 4 more bytes to get to 48 and align the
	* IP header to a multiple of 16.
	*/
	skb_reserve(skb, 4);

	addr = ib_dma_map_single(priv->ca, skb->data, IPOIB_BUF_SIZE,
	DMA_FROM_DEVICE);
	if (unlikely(ib_dma_mapping_error(priv->ca, addr))) {
	dev_kfree_skb_any(skb);
	return -EIO;
	}

	priv->rx_ring[id].skb = skb;
	priv->rx_ring[id].mapping = addr;

	return 0;
	}

	static int ipoib_ib_post_receives(struct net_device *dev)
	{
	struct ipoib_dev_priv *priv = netdev_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 = netdev_priv(dev);
	unsigned int wr_id = wc->wr_id & ~IPOIB_OP_RECV;
	struct sk_buff *skb;
	u64 addr;

	ipoib_dbg_data(priv, "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, "recv completion event with wrid %d (> %d)\n",
	wr_id, ipoib_recvq_size);
	return;
	}

	skb = priv->rx_ring[wr_id].skb;
	addr = priv->rx_ring[wr_id].mapping;

	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);
	ib_dma_unmap_single(priv->ca, addr,
	IPOIB_BUF_SIZE, DMA_FROM_DEVICE);
	dev_kfree_skb_any(skb);
	priv->rx_ring[wr_id].skb = NULL;
	return;
	}

	/*
	* 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))) {
	++priv->stats.rx_dropped;
	goto repost;
	}

	ipoib_dbg_data(priv, "received %d bytes, SLID 0x%04x\n",
	wc->byte_len, wc->slid);

	ib_dma_unmap_single(priv->ca, addr, IPOIB_BUF_SIZE, DMA_FROM_DEVICE);

	skb_put(skb, wc->byte_len);
	skb_pull(skb, IB_GRH_BYTES);

	if (wc->slid != priv->local_lid \|\|
	wc->src_qp != priv->qp->qp_num) {
	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);
	} else {
	ipoib_dbg_data(priv, "dropping loopback packet\n");
	dev_kfree_skb_any(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);
	}

	static void ipoib_ib_handle_tx_wc(struct net_device dev, 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, "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, "send completion event with wrid %d (> %d)\n",
	wr_id, ipoib_sendq_size);
	return;
	}

	tx_req = &priv->tx_ring[wr_id];

	ib_dma_unmap_single(priv->ca, tx_req->mapping,
	tx_req->skb->len, DMA_TO_DEVICE);

	++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);
	++priv->tx_tail;
	if (netif_queue_stopped(dev) &&
	test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags) &&
	priv->tx_head - priv->tx_tail <= ipoib_sendq_size >> 1)
	netif_wake_queue(dev);
	spin_unlock_irqrestore(&priv->tx_lock, flags);

	if (wc->status != IB_WC_SUCCESS &&
	wc->status != IB_WC_WR_FLUSH_ERR)
	ipoib_warn(priv, "failed send event "
	"(status=%d, wrid=%d vend_err %x)\n",
	wc->status, wr_id, wc->vendor_err);
	}

	static void ipoib_ib_handle_wc(struct net_device dev, struct ib_wc wc)
	{
	if (wc->wr_id & IPOIB_OP_RECV)
	ipoib_ib_handle_rx_wc(dev, wc);
	else
	ipoib_ib_handle_tx_wc(dev, wc);
	}

	void ipoib_ib_completion(struct ib_cq cq, void dev_ptr)
	{
	struct net_device dev = (struct net_device ) dev_ptr;
	struct ipoib_dev_priv *priv = netdev_priv(dev);
	int n, i;

	ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
	do {
	n = ib_poll_cq(cq, IPOIB_NUM_WC, priv->ibwc);
	for (i = 0; i < n; ++i)
	ipoib_ib_handle_wc(dev, priv->ibwc + i);
	} while (n == IPOIB_NUM_WC);
	}

	static inline int post_send(struct ipoib_dev_priv *priv,
	unsigned int wr_id,
	struct ib_ah *address, u32 qpn,
	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;
	priv->tx_wr.wr.ud.remote_qpn = qpn;
	priv->tx_wr.wr.ud.ah = address;

	return ib_post_send(priv->qp, &priv->tx_wr, &bad_wr);
	}

	void ipoib_send(struct net_device dev, struct sk_buff skb,
	struct ipoib_ah *address, u32 qpn)
	{
	struct ipoib_dev_priv *priv = netdev_priv(dev);
	struct ipoib_tx_buf *tx_req;
	u64 addr;

	if (unlikely(skb->len > dev->mtu + INFINIBAND_ALEN)) {
	ipoib_warn(priv, "packet len %d (> %d) too long to send, dropping\n",
	skb->len, dev->mtu + INFINIBAND_ALEN);
	++priv->stats.tx_dropped;
	++priv->stats.tx_errors;
	dev_kfree_skb_any(skb);
	return;
	}

	ipoib_dbg_data(priv, "sending packet, length=%d address=%p qpn=0x%06x\n",
	skb->len, address, qpn);

	/*
	* 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;
	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, priv->tx_head & (ipoib_sendq_size - 1),
	address->ah, qpn, 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;

	address->last_send = priv->tx_head;
	++priv->tx_head;

	if (priv->tx_head - priv->tx_tail == ipoib_sendq_size) {
	ipoib_dbg(priv, "TX ring full, stopping kernel net queue\n");
	netif_stop_queue(dev);
	}
	}
	}

	static void __ipoib_reap_ah(struct net_device *dev)
	{
	struct ipoib_dev_priv *priv = netdev_priv(dev);
	struct ipoib_ah ah, tah;
	LIST_HEAD(remove_list);

	spin_lock_irq(&priv->tx_lock);
	spin_lock(&priv->lock);
	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);
	ib_destroy_ah(ah->ah);
	kfree(ah);
	}
	spin_unlock(&priv->lock);
	spin_unlock_irq(&priv->tx_lock);
	}

	void ipoib_reap_ah(struct work_struct *work)
	{
	struct ipoib_dev_priv *priv =
	container_of(work, struct ipoib_dev_priv, ah_reap_task.work);
	struct net_device *dev = priv->dev;

	__ipoib_reap_ah(dev);

	if (!test_bit(IPOIB_STOP_REAPER, &priv->flags))
	queue_delayed_work(ipoib_workqueue, &priv->ah_reap_task, HZ);
	}

	int ipoib_ib_dev_open(struct net_device *dev)
	{
	struct ipoib_dev_priv *priv = netdev_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);
	ipoib_ib_dev_stop(dev);
	return -1;
	}

	clear_bit(IPOIB_STOP_REAPER, &priv->flags);
	queue_delayed_work(ipoib_workqueue, &priv->ah_reap_task, HZ);

	set_bit(IPOIB_FLAG_INITIALIZED, &priv->flags);

	return 0;
	}

	static void ipoib_pkey_dev_check_presence(struct net_device *dev)
	{
	struct ipoib_dev_priv *priv = netdev_priv(dev);
	u16 pkey_index = 0;

	if (ib_find_cached_pkey(priv->ca, priv->port, priv->pkey, &pkey_index))
	clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
	else
	set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
	}

	int ipoib_ib_dev_up(struct net_device *dev)
	{
	struct ipoib_dev_priv *priv = netdev_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 0;
	}

	set_bit(IPOIB_FLAG_OPER_UP, &priv->flags);

	return ipoib_mcast_start_thread(dev);
	}

	int ipoib_ib_dev_down(struct net_device *dev, int flush)
	{
	struct ipoib_dev_priv *priv = netdev_priv(dev);

	ipoib_dbg(priv, "downing ib_dev\n");

	clear_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
	netif_carrier_off(dev);

	/* Shutdown the P_Key thread if still active */
	if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
	mutex_lock(&pkey_mutex);
	set_bit(IPOIB_PKEY_STOP, &priv->flags);
	cancel_delayed_work(&priv->pkey_task);
	mutex_unlock(&pkey_mutex);
	if (flush)
	flush_workqueue(ipoib_workqueue);
	}

	ipoib_mcast_stop_thread(dev, flush);
	ipoib_mcast_dev_flush(dev);

	ipoib_flush_paths(dev);

	return 0;
	}

	static int recvs_pending(struct net_device *dev)
	{
	struct ipoib_dev_priv *priv = netdev_priv(dev);
	int pending = 0;
	int i;

	for (i = 0; i < ipoib_recvq_size; ++i)
	if (priv->rx_ring[i].skb)
	++pending;

	return pending;
	}

	int ipoib_ib_dev_stop(struct net_device *dev)
	{
	struct ipoib_dev_priv *priv = netdev_priv(dev);
	struct ib_qp_attr qp_attr;
	unsigned long begin;
	struct ipoib_tx_buf *tx_req;
	int i;

	clear_bit(IPOIB_FLAG_INITIALIZED, &priv->flags);

	/*
	* 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))
	ipoib_warn(priv, "Failed to modify QP to ERROR state\n");

	/* 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)];
	ib_dma_unmap_single(priv->ca,
	tx_req->mapping,
	tx_req->skb->len,
	DMA_TO_DEVICE);
	dev_kfree_skb_any(tx_req->skb);
	++priv->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;
	ib_dma_unmap_single(priv->ca,
	rx_req->mapping,
	IPOIB_BUF_SIZE,
	DMA_FROM_DEVICE);
	dev_kfree_skb_any(rx_req->skb);
	rx_req->skb = NULL;
	}

	goto timeout;
	}

	msleep(1);
	}

	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");

	/* Wait for all AHs to be reaped */
	set_bit(IPOIB_STOP_REAPER, &priv->flags);
	cancel_delayed_work(&priv->ah_reap_task);
	flush_workqueue(ipoib_workqueue);

	begin = jiffies;

	while (!list_empty(&priv->dead_ahs)) {
	__ipoib_reap_ah(dev);

	if (time_after(jiffies, begin + HZ)) {
	ipoib_warn(priv, "timing out; will leak address handles\n");
	break;
	}

	msleep(1);
	}

	return 0;
	}

	int ipoib_ib_dev_init(struct net_device dev, struct ib_device ca, int port)
	{
	struct ipoib_dev_priv *priv = netdev_priv(dev);

	priv->ca = ca;
	priv->port = port;
	priv->qp = NULL;

	if (ipoib_transport_dev_init(dev, ca)) {
	printk(KERN_WARNING "%s: ipoib_transport_dev_init failed\n", ca->name);
	return -ENODEV;
	}

	if (dev->flags & IFF_UP) {
	if (ipoib_ib_dev_open(dev)) {
	ipoib_transport_dev_cleanup(dev);
	return -ENODEV;
	}
	}

	return 0;
	}

	void ipoib_ib_dev_flush(struct work_struct *work)
	{
	struct ipoib_dev_priv cpriv, priv =
	container_of(work, struct ipoib_dev_priv, flush_task);
	struct net_device *dev = priv->dev;

	if (!test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags) ) {
	ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_INITIALIZED not set.\n");
	return;
	}

	if (!test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) {
	ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_ADMIN_UP not set.\n");
	return;
	}

	ipoib_dbg(priv, "flushing\n");

	ipoib_ib_dev_down(dev, 0);

	/*
	* 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)) {
	ipoib_ib_dev_up(dev);
	ipoib_mcast_restart_task(&priv->restart_task);
	}

	mutex_lock(&priv->vlan_mutex);

	/* Flush any child interfaces too */
	list_for_each_entry(cpriv, &priv->child_intfs, list)
	ipoib_ib_dev_flush(&cpriv->flush_task);

	mutex_unlock(&priv->vlan_mutex);
	}

	void ipoib_ib_dev_cleanup(struct net_device *dev)
	{
	struct ipoib_dev_priv *priv = netdev_priv(dev);

	ipoib_dbg(priv, "cleaning up ib_dev\n");

	ipoib_mcast_stop_thread(dev, 1);
	ipoib_mcast_dev_flush(dev);

	ipoib_transport_dev_cleanup(dev);
	}

	/*
	* Delayed P_Key Assigment Interim Support
	*
	* The following is initial implementation of delayed P_Key assigment
	* mechanism. It is using the same approach implemented for the multicast
	* group join. The single goal of this implementation is to quickly address
	* Bug #2507. This implementation will probably be removed when the P_Key
	* change async notification is available.
	*/

	void ipoib_pkey_poll(struct work_struct *work)
	{
	struct ipoib_dev_priv *priv =
	container_of(work, struct ipoib_dev_priv, pkey_task.work);
	struct net_device *dev = priv->dev;

	ipoib_pkey_dev_check_presence(dev);

	if (test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags))
	ipoib_open(dev);
	else {
	mutex_lock(&pkey_mutex);
	if (!test_bit(IPOIB_PKEY_STOP, &priv->flags))
	queue_delayed_work(ipoib_workqueue,
	&priv->pkey_task,
	HZ);
	mutex_unlock(&pkey_mutex);
	}
	}

	int ipoib_pkey_dev_delay_open(struct net_device *dev)
	{
	struct ipoib_dev_priv *priv = netdev_priv(dev);

	/* Look for the interface pkey value in the IB Port P_Key table and */
	/* set the interface pkey assigment flag */
	ipoib_pkey_dev_check_presence(dev);

	/* P_Key value not assigned yet - start polling */
	if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) {
	mutex_lock(&pkey_mutex);
	clear_bit(IPOIB_PKEY_STOP, &priv->flags);
	queue_delayed_work(ipoib_workqueue,
	&priv->pkey_task,
	HZ);
	mutex_unlock(&pkey_mutex);
	return 1;
	}

	return 0;
	}