[git patch review 2/5] IB/uverbs: Flush scheduled work before unloading module

[git patch review 2/5] IB/uverbs: Flush scheduled work before unloading module

[Roland Dreier]

uverbs might schedule work to clean up when a file is closed.  Make
sure that this work runs before allowing module text to go away.

Signed-off-by: Michael S. Tsirkin <mst@mellanox.co.il>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

---

 drivers/infiniband/core/uverbs_main.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

cc76e33ec98ee2acab2d10828d31588d1b10f274
diff --git a/drivers/infiniband/core/uverbs_main.c b/drivers/infiniband/core/uverbs_main.c
index 96ea79b..903f85a 100644
--- a/drivers/infiniband/core/uverbs_main.c
+++ b/drivers/infiniband/core/uverbs_main.c
@@ -902,6 +902,7 @@ static void __exit ib_uverbs_cleanup(voi
 	unregister_filesystem(&uverbs_event_fs);
 	class_destroy(uverbs_class);
 	unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
+	flush_scheduled_work();
 	idr_destroy(&ib_uverbs_pd_idr);
 	idr_destroy(&ib_uverbs_mr_idr);
 	idr_destroy(&ib_uverbs_mw_idr);
-- 
1.1.3

[git patch review 1/5] IPoIB: Make sure path is fully initialized before using it

[Roland Dreier]

The SA path record query completion can initialize path->pathrec.dlid
before IPoIB's callback runs and initializes path->ah, so we must test
ah rather than dlid.

Signed-off-by: Michael S. Tsirkin <mst@mellanox.co.il>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

---

 drivers/infiniband/ulp/ipoib/ipoib_main.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

47f7a0714b67b904a3a36e2f2d85904e8064219b
diff --git a/drivers/infiniband/ulp/ipoib/ipoib_main.c b/drivers/infiniband/ulp/ipoib/ipoib_main.c
index fd3f5c8..c3b5f79 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib_main.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_main.c
@@ -505,7 +505,7 @@ static void neigh_add_path(struct sk_buf
 
 	list_add_tail(&neigh->list, &path->neigh_list);
 
-	if (path->pathrec.dlid) {
+	if (path->ah) {
 		kref_get(&path->ah->ref);
 		neigh->ah = path->ah;
 
@@ -591,7 +591,7 @@ static void unicast_arp_send(struct sk_b
 		return;
 	}
 
-	if (path->pathrec.dlid) {
+	if (path->ah) {
 		ipoib_dbg(priv, "Send unicast ARP to %04x\n",
 			  be16_to_cpu(path->pathrec.dlid));
 
-- 
1.1.3

[git patch review 3/5] IB/sa_query: Flush scheduled work before unloading module

[Roland Dreier]

sa_query schedules work on IB asynchronous events.  After
unregistering the async event handler, make sure that this work has
completed before releasing the IB device (and possibly allowing the
sa_query module text to go away).

Signed-off-by: Michael S. Tsirkin <mst@mellanox.co.il>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

---

 drivers/infiniband/core/sa_query.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

0f47ae0b3ec35dc5f4723f2e0ad0f6f3f55e9bcd
diff --git a/drivers/infiniband/core/sa_query.c b/drivers/infiniband/core/sa_query.c
index acda7d6..501cc05 100644
--- a/drivers/infiniband/core/sa_query.c
+++ b/drivers/infiniband/core/sa_query.c
@@ -956,6 +956,8 @@ static void ib_sa_remove_one(struct ib_d
 
 	ib_unregister_event_handler(&sa_dev->event_handler);
 
+	flush_scheduled_work();
+
 	for (i = 0; i <= sa_dev->end_port - sa_dev->start_port; ++i) {
 		ib_unregister_mad_agent(sa_dev->port[i].agent);
 		kref_put(&sa_dev->port[i].sm_ah->ref, free_sm_ah);
-- 
1.1.3

[git patch review 5/5] IB/mthca: Use correct GID in MADs sent on port 2

[Roland Dreier]

mthca_create_ah() includes the port number in the GID index. The reverse
needs to be done in mthca_read_ah().

Noted by Hal Rosenstock.

Signed-off-by: Michael S. Tsirkin <mst@mellanox.co.il>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

---

 drivers/infiniband/hw/mthca/mthca_av.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

f9e61929e5e1dacc2afefbde6abc3e6571ca2887
diff --git a/drivers/infiniband/hw/mthca/mthca_av.c b/drivers/infiniband/hw/mthca/mthca_av.c
index a14eed0..a19e0ed 100644
--- a/drivers/infiniband/hw/mthca/mthca_av.c
+++ b/drivers/infiniband/hw/mthca/mthca_av.c
@@ -184,7 +184,7 @@ int mthca_read_ah(struct mthca_dev *dev,
 			ah->av->sl_tclass_flowlabel & cpu_to_be32(0xfffff);
 		ib_get_cached_gid(&dev->ib_dev,
 				  be32_to_cpu(ah->av->port_pd) >> 24,
-				  ah->av->gid_index,
+				  ah->av->gid_index % dev->limits.gid_table_len,
 				  &header->grh.source_gid);
 		memcpy(header->grh.destination_gid.raw,
 		       ah->av->dgid, 16);
-- 
1.1.3

[git patch review 4/5] IPoIB: Lock accesses to multicast packet queues

[Roland Dreier]

Avoid corrupting mcast->pkt_queue by serializing access with
priv->tx_lock.  Also, update dropped packet statistics to count
multicast packets removed from pkt_queue as dropped.

Signed-off-by: Michael S. Tsirkin <mst@mellanox.co.il>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

---

 drivers/infiniband/ulp/ipoib/ipoib_multicast.c |   25 +++++++++++++++++++++---
 1 files changed, 22 insertions(+), 3 deletions(-)

b36f170b617a7cd147b694dabf504e856a50ee9d
diff --git a/drivers/infiniband/ulp/ipoib/ipoib_multicast.c b/drivers/infiniband/ulp/ipoib/ipoib_multicast.c
index 98039da..ccaa0c3 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib_multicast.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_multicast.c
@@ -97,6 +97,7 @@ static void ipoib_mcast_free(struct ipoi
 	struct ipoib_dev_priv *priv = netdev_priv(dev);
 	struct ipoib_neigh *neigh, *tmp;
 	unsigned long flags;
+	int tx_dropped = 0;
 
 	ipoib_dbg_mcast(netdev_priv(dev),
 			"deleting multicast group " IPOIB_GID_FMT "\n",
@@ -123,8 +124,14 @@ static void ipoib_mcast_free(struct ipoi
 	if (mcast->ah)
 		ipoib_put_ah(mcast->ah);
 
-	while (!skb_queue_empty(&mcast->pkt_queue))
+	while (!skb_queue_empty(&mcast->pkt_queue)) {
+		++tx_dropped;
 		dev_kfree_skb_any(skb_dequeue(&mcast->pkt_queue));
+	}
+
+	spin_lock_irqsave(&priv->tx_lock, flags);
+	priv->stats.tx_dropped += tx_dropped;
+	spin_unlock_irqrestore(&priv->tx_lock, flags);
 
 	kfree(mcast);
 }
@@ -276,8 +283,10 @@ static int ipoib_mcast_join_finish(struc
 	}
 
 	/* actually send any queued packets */
+	spin_lock_irq(&priv->tx_lock);
 	while (!skb_queue_empty(&mcast->pkt_queue)) {
 		struct sk_buff *skb = skb_dequeue(&mcast->pkt_queue);
+		spin_unlock_irq(&priv->tx_lock);
 
 		skb->dev = dev;
 
@@ -288,7 +297,9 @@ static int ipoib_mcast_join_finish(struc
 
 		if (dev_queue_xmit(skb))
 			ipoib_warn(priv, "dev_queue_xmit failed to requeue packet\n");
+		spin_lock_irq(&priv->tx_lock);
 	}
+	spin_unlock_irq(&priv->tx_lock);
 
 	return 0;
 }
@@ -300,6 +311,7 @@ ipoib_mcast_sendonly_join_complete(int s
 {
 	struct ipoib_mcast *mcast = mcast_ptr;
 	struct net_device *dev = mcast->dev;
+	struct ipoib_dev_priv *priv = netdev_priv(dev);
 
 	if (!status)
 		ipoib_mcast_join_finish(mcast, mcmember);
@@ -310,8 +322,12 @@ ipoib_mcast_sendonly_join_complete(int s
 					IPOIB_GID_ARG(mcast->mcmember.mgid), status);
 
 		/* Flush out any queued packets */
-		while (!skb_queue_empty(&mcast->pkt_queue))
+		spin_lock_irq(&priv->tx_lock);
+		while (!skb_queue_empty(&mcast->pkt_queue)) {
+			++priv->stats.tx_dropped;
 			dev_kfree_skb_any(skb_dequeue(&mcast->pkt_queue));
+		}
+		spin_unlock_irq(&priv->tx_lock);
 
 		/* Clear the busy flag so we try again */
 		clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
@@ -687,6 +703,7 @@ void ipoib_mcast_send(struct net_device 
 		if (!mcast) {
 			ipoib_warn(priv, "unable to allocate memory for "
 				   "multicast structure\n");
+			++priv->stats.tx_dropped;
 			dev_kfree_skb_any(skb);
 			goto out;
 		}
@@ -700,8 +717,10 @@ void ipoib_mcast_send(struct net_device 
 	if (!mcast->ah) {
 		if (skb_queue_len(&mcast->pkt_queue) < IPOIB_MAX_MCAST_QUEUE)
 			skb_queue_tail(&mcast->pkt_queue, skb);
-		else
+		else {
+			++priv->stats.tx_dropped;
 			dev_kfree_skb_any(skb);
+		}
 
 		if (mcast->query)
 			ipoib_dbg_mcast(priv, "no address vector, "
-- 
1.1.3