3 files changed, 60 insertions, 3 deletions

diff --git a/drivers/infiniband/ulp/ipoib/ipoib.h b/drivers/infiniband/ulp/ipoib/ipoib.h
index 35e9c8a330..963e936da5 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib.h
+++ b/drivers/infiniband/ulp/ipoib/ipoib.h
@@ -351,10 +351,12 @@ struct ipoib_dev_priv {
 	struct workqueue_struct *wq;
 	struct delayed_work mcast_task;
 	struct work_struct carrier_on_task;
+	struct work_struct reschedule_napi_work;
 	struct work_struct flush_light;
 	struct work_struct flush_normal;
 	struct work_struct flush_heavy;
 	struct work_struct restart_task;
+	struct work_struct tx_timeout_work;
 	struct delayed_work ah_reap_task;
 	struct delayed_work neigh_reap_task;
 	struct ib_device *ca;
@@ -499,6 +501,7 @@ int ipoib_send(struct net_device *dev, struct sk_buff *skb,
 	       struct ib_ah *address, u32 dqpn);
 void ipoib_reap_ah(struct work_struct *work);
 
+void ipoib_napi_schedule_work(struct work_struct *work);
 struct ipoib_path *__path_find(struct net_device *dev, void *gid);
 void ipoib_mark_paths_invalid(struct net_device *dev);
 void ipoib_flush_paths(struct net_device *dev);
@@ -510,6 +513,7 @@ void ipoib_ib_tx_timer_func(struct timer_list *t);
 void ipoib_ib_dev_flush_light(struct work_struct *work);
 void ipoib_ib_dev_flush_normal(struct work_struct *work);
 void ipoib_ib_dev_flush_heavy(struct work_struct *work);
+void ipoib_ib_tx_timeout_work(struct work_struct *work);
 void ipoib_pkey_event(struct work_struct *work);
 void ipoib_ib_dev_cleanup(struct net_device *dev);
 
diff --git a/drivers/infiniband/ulp/ipoib/ipoib_ib.c b/drivers/infiniband/ulp/ipoib/ipoib_ib.c
index 7f84d9866c..5cde275daa 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib_ib.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_ib.c
@@ -531,11 +531,35 @@ void ipoib_ib_rx_completion(struct ib_cq *cq, void *ctx_ptr)
 	napi_schedule(&priv->recv_napi);
 }
 
+/* The function will force napi_schedule */
+void ipoib_napi_schedule_work(struct work_struct *work)
+{
+	struct ipoib_dev_priv *priv =
+		container_of(work, struct ipoib_dev_priv, reschedule_napi_work);
+	bool ret;
+
+	do {
+		ret = napi_schedule(&priv->send_napi);
+		if (!ret)
+			msleep(3);
+	} while (!ret && netif_queue_stopped(priv->dev) &&
+		 test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags));
+}
+
 void ipoib_ib_tx_completion(struct ib_cq *cq, void *ctx_ptr)
 {
 	struct ipoib_dev_priv *priv = ctx_ptr;
+	bool ret;
 
-	napi_schedule(&priv->send_napi);
+	ret = napi_schedule(&priv->send_napi);
+	/*
+	 * if the queue is closed the driver must be able to schedule napi,
+	 * otherwise we can end with closed queue forever, because no new
+	 * packets to send and napi callback might not get new event after
+	 * its re-arm of the napi.
+	 */
+	if (!ret && netif_queue_stopped(priv->dev))
+		schedule_work(&priv->reschedule_napi_work);
 }
 
 static inline int post_send(struct ipoib_dev_priv *priv,
diff --git a/drivers/infiniband/ulp/ipoib/ipoib_main.c b/drivers/infiniband/ulp/ipoib/ipoib_main.c
index 967004ccad..7a5be705d7 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib_main.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_main.c
@@ -1200,7 +1200,34 @@ static void ipoib_timeout(struct net_device *dev, unsigned int txqueue)
 		   netif_queue_stopped(dev), priv->tx_head, priv->tx_tail,
 		   priv->global_tx_head, priv->global_tx_tail);
 
-	/* XXX reset QP, etc. */
+
+	schedule_work(&priv->tx_timeout_work);
+}
+
+void ipoib_ib_tx_timeout_work(struct work_struct *work)
+{
+	struct ipoib_dev_priv *priv = container_of(work,
+						   struct ipoib_dev_priv,
+						   tx_timeout_work);
+	int err;
+
+	rtnl_lock();
+
+	if (!test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
+		goto unlock;
+
+	ipoib_stop(priv->dev);
+	err = ipoib_open(priv->dev);
+	if (err) {
+		ipoib_warn(priv, "ipoib_open failed recovering from a tx_timeout, err(%d).\n",
+				err);
+		goto unlock;
+	}
+
+	netif_tx_wake_all_queues(priv->dev);
+unlock:
+	rtnl_unlock();
+
 }
 
 static int ipoib_hard_header(struct sk_buff *skb,
@@ -2112,7 +2139,7 @@ void ipoib_setup_common(struct net_device *dev)
 
 	ipoib_set_ethtool_ops(dev);
 
-	dev->watchdog_timeo	 = HZ;
+	dev->watchdog_timeo	 = 10 * HZ;
 
 	dev->flags		|= IFF_BROADCAST | IFF_MULTICAST;
 
@@ -2150,10 +2177,12 @@ static void ipoib_build_priv(struct net_device *dev)
 
 	INIT_DELAYED_WORK(&priv->mcast_task,   ipoib_mcast_join_task);
 	INIT_WORK(&priv->carrier_on_task, ipoib_mcast_carrier_on_task);
+	INIT_WORK(&priv->reschedule_napi_work, ipoib_napi_schedule_work);
 	INIT_WORK(&priv->flush_light,   ipoib_ib_dev_flush_light);
 	INIT_WORK(&priv->flush_normal,   ipoib_ib_dev_flush_normal);
 	INIT_WORK(&priv->flush_heavy,   ipoib_ib_dev_flush_heavy);
 	INIT_WORK(&priv->restart_task, ipoib_mcast_restart_task);
+	INIT_WORK(&priv->tx_timeout_work, ipoib_ib_tx_timeout_work);
 	INIT_DELAYED_WORK(&priv->ah_reap_task, ipoib_reap_ah);
 	INIT_DELAYED_WORK(&priv->neigh_reap_task, ipoib_reap_neigh);
 }