IPoIB: Handle P_Key table reordering

SM reconfiguration or failover possibly causes a shuffling of the values
in the P_Key table. Right now, IPoIB only queries for the P_Key index
once when it creates the device QP, and hence there are problems if the
index of a P_Key value changes.  Fix this by using the PKEY_CHANGE event
to trigger a recheck of the P_Key index.

Signed-off-by: Yosef Etigin <yosefe@voltaire.com>
Acked-by: Michael S. Tsirkin <mst@dev.mellanox.co.il>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

4 files changed, 92 insertions, 45 deletions

diff --git a/drivers/infiniband/ulp/ipoib/ipoib.h b/drivers/infiniband/ulp/ipoib/ipoib.h
index 87310eeb6df..93d4a9a1e1d 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib.h
+++ b/drivers/infiniband/ulp/ipoib/ipoib.h
@@ -201,15 +201,17 @@ struct ipoib_dev_priv {
 	struct list_head multicast_list;
 	struct rb_root multicast_tree;
 
-	struct delayed_work pkey_task;
+	struct delayed_work pkey_poll_task;
 	struct delayed_work mcast_task;
 	struct work_struct flush_task;
 	struct work_struct restart_task;
 	struct delayed_work ah_reap_task;
+	struct work_struct pkey_event_task;
 
 	struct ib_device *ca;
 	u8            	  port;
 	u16           	  pkey;
+	u16               pkey_index;
 	struct ib_pd  	 *pd;
 	struct ib_mr  	 *mr;
 	struct ib_cq  	 *cq;
@@ -333,12 +335,13 @@ struct ipoib_dev_priv *ipoib_intf_alloc(const char *format);
 
 int ipoib_ib_dev_init(struct net_device *dev, struct ib_device *ca, int port);
 void ipoib_ib_dev_flush(struct work_struct *work);
+void ipoib_pkey_event(struct work_struct *work);
 void ipoib_ib_dev_cleanup(struct net_device *dev);
 
 int ipoib_ib_dev_open(struct net_device *dev);
 int ipoib_ib_dev_up(struct net_device *dev);
 int ipoib_ib_dev_down(struct net_device *dev, int flush);
-int ipoib_ib_dev_stop(struct net_device *dev);
+int ipoib_ib_dev_stop(struct net_device *dev, int flush);
 
 int ipoib_dev_init(struct net_device *dev, struct ib_device *ca, int port);
 void ipoib_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 68d72c6f7ff..e3b0937011d 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib_ib.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_ib.c
@@ -448,6 +448,13 @@ int ipoib_ib_dev_open(struct net_device *dev)
 	struct ipoib_dev_priv *priv = netdev_priv(dev);
 	int ret;
 
+	if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &priv->pkey_index)) {
+		ipoib_warn(priv, "P_Key 0x%04x not found\n", priv->pkey);
+		clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
+		return -1;
+	}
+	set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
+
 	ret = ipoib_init_qp(dev);
 	if (ret) {
 		ipoib_warn(priv, "ipoib_init_qp returned %d\n", ret);
@@ -457,14 +464,14 @@ int ipoib_ib_dev_open(struct net_device *dev)
 	ret = ipoib_ib_post_receives(dev);
 	if (ret) {
 		ipoib_warn(priv, "ipoib_ib_post_receives returned %d\n", ret);
-		ipoib_ib_dev_stop(dev);
+		ipoib_ib_dev_stop(dev, 1);
 		return -1;
 	}
 
 	ret = ipoib_cm_dev_open(dev);
 	if (ret) {
 		ipoib_warn(priv, "ipoib_ib_post_receives returned %d\n", ret);
-		ipoib_ib_dev_stop(dev);
+		ipoib_ib_dev_stop(dev, 1);
 		return -1;
 	}
 
@@ -516,7 +523,7 @@ int ipoib_ib_dev_down(struct net_device *dev, int flush)
 	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);
+		cancel_delayed_work(&priv->pkey_poll_task);
 		mutex_unlock(&pkey_mutex);
 		if (flush)
 			flush_workqueue(ipoib_workqueue);
@@ -543,7 +550,7 @@ static int recvs_pending(struct net_device *dev)
 	return pending;
 }
 
-int ipoib_ib_dev_stop(struct net_device *dev)
+int ipoib_ib_dev_stop(struct net_device *dev, int flush)
 {
 	struct ipoib_dev_priv *priv = netdev_priv(dev);
 	struct ib_qp_attr qp_attr;
@@ -629,7 +636,8 @@ timeout:
 	/* 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);
+	if (flush)
+		flush_workqueue(ipoib_workqueue);
 
 	begin = jiffies;
 
@@ -673,13 +681,24 @@ int ipoib_ib_dev_init(struct net_device *dev, struct ib_device *ca, int port)
 	return 0;
 }
 
-void ipoib_ib_dev_flush(struct work_struct *work)
+static void __ipoib_ib_dev_flush(struct ipoib_dev_priv *priv, int pkey_event)
 {
-	struct ipoib_dev_priv *cpriv, *priv =
-		container_of(work, struct ipoib_dev_priv, flush_task);
+	struct ipoib_dev_priv *cpriv;
 	struct net_device *dev = priv->dev;
+	u16 new_index;
+
+	mutex_lock(&priv->vlan_mutex);
 
-	if (!test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags) ) {
+	/*
+	 * 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, pkey_event);
+
+	mutex_unlock(&priv->vlan_mutex);
+
+	if (!test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags)) {
 		ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_INITIALIZED not set.\n");
 		return;
 	}
@@ -689,10 +708,32 @@ void ipoib_ib_dev_flush(struct work_struct *work)
 		return;
 	}
 
+	if (pkey_event) {
+		if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &new_index)) {
+			clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
+			ipoib_ib_dev_down(dev, 0);
+			ipoib_pkey_dev_delay_open(dev);
+			return;
+		}
+		set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
+
+		/* restart QP only if P_Key index is changed */
+		if (new_index == priv->pkey_index) {
+			ipoib_dbg(priv, "Not flushing - P_Key index not changed.\n");
+			return;
+		}
+		priv->pkey_index = new_index;
+	}
+
 	ipoib_dbg(priv, "flushing\n");
 
 	ipoib_ib_dev_down(dev, 0);
 
+	if (pkey_event) {
+		ipoib_ib_dev_stop(dev, 0);
+		ipoib_ib_dev_open(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
@@ -701,14 +742,24 @@ void ipoib_ib_dev_flush(struct work_struct *work)
 		ipoib_ib_dev_up(dev);
 		ipoib_mcast_restart_task(&priv->restart_task);
 	}
+}
 
-	mutex_lock(&priv->vlan_mutex);
+void ipoib_ib_dev_flush(struct work_struct *work)
+{
+	struct ipoib_dev_priv *priv =
+		container_of(work, struct ipoib_dev_priv, flush_task);
 
-	/* Flush any child interfaces too */
-	list_for_each_entry(cpriv, &priv->child_intfs, list)
-		ipoib_ib_dev_flush(&cpriv->flush_task);
+	ipoib_dbg(priv, "Flushing %s\n", priv->dev->name);
+	__ipoib_ib_dev_flush(priv, 0);
+}
 
-	mutex_unlock(&priv->vlan_mutex);
+void ipoib_pkey_event(struct work_struct *work)
+{
+	struct ipoib_dev_priv *priv =
+		container_of(work, struct ipoib_dev_priv, pkey_event_task);
+
+	ipoib_dbg(priv, "Flushing %s and restarting its QP\n", priv->dev->name);
+	__ipoib_ib_dev_flush(priv, 1);
 }
 
 void ipoib_ib_dev_cleanup(struct net_device *dev)
@@ -736,7 +787,7 @@ void ipoib_ib_dev_cleanup(struct net_device *dev)
 void ipoib_pkey_poll(struct work_struct *work)
 {
 	struct ipoib_dev_priv *priv =
-		container_of(work, struct ipoib_dev_priv, pkey_task.work);
+		container_of(work, struct ipoib_dev_priv, pkey_poll_task.work);
 	struct net_device *dev = priv->dev;
 
 	ipoib_pkey_dev_check_presence(dev);
@@ -747,7 +798,7 @@ void ipoib_pkey_poll(struct work_struct *work)
 		mutex_lock(&pkey_mutex);
 		if (!test_bit(IPOIB_PKEY_STOP, &priv->flags))
 			queue_delayed_work(ipoib_workqueue,
-					   &priv->pkey_task,
+					   &priv->pkey_poll_task,
 					   HZ);
 		mutex_unlock(&pkey_mutex);
 	}
@@ -766,7 +817,7 @@ int ipoib_pkey_dev_delay_open(struct net_device *dev)
 		mutex_lock(&pkey_mutex);
 		clear_bit(IPOIB_PKEY_STOP, &priv->flags);
 		queue_delayed_work(ipoib_workqueue,
-				   &priv->pkey_task,
+				   &priv->pkey_poll_task,
 				   HZ);
 		mutex_unlock(&pkey_mutex);
 		return 1;
diff --git a/drivers/infiniband/ulp/ipoib/ipoib_main.c b/drivers/infiniband/ulp/ipoib/ipoib_main.c
index 0a428f2b05c..894b1dcdf3e 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib_main.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_main.c
@@ -107,7 +107,7 @@ int ipoib_open(struct net_device *dev)
 		return -EINVAL;
 
 	if (ipoib_ib_dev_up(dev)) {
-		ipoib_ib_dev_stop(dev);
+		ipoib_ib_dev_stop(dev, 1);
 		return -EINVAL;
 	}
 
@@ -152,7 +152,7 @@ static int ipoib_stop(struct net_device *dev)
 	flush_workqueue(ipoib_workqueue);
 
 	ipoib_ib_dev_down(dev, 1);
-	ipoib_ib_dev_stop(dev);
+	ipoib_ib_dev_stop(dev, 1);
 
 	if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
 		struct ipoib_dev_priv *cpriv;
@@ -988,7 +988,8 @@ static void ipoib_setup(struct net_device *dev)
 	INIT_LIST_HEAD(&priv->dead_ahs);
 	INIT_LIST_HEAD(&priv->multicast_list);
 
-	INIT_DELAYED_WORK(&priv->pkey_task,    ipoib_pkey_poll);
+	INIT_DELAYED_WORK(&priv->pkey_poll_task, ipoib_pkey_poll);
+	INIT_WORK(&priv->pkey_event_task, ipoib_pkey_event);
 	INIT_DELAYED_WORK(&priv->mcast_task,   ipoib_mcast_join_task);
 	INIT_WORK(&priv->flush_task,   ipoib_ib_dev_flush);
 	INIT_WORK(&priv->restart_task, ipoib_mcast_restart_task);
diff --git a/drivers/infiniband/ulp/ipoib/ipoib_verbs.c b/drivers/infiniband/ulp/ipoib/ipoib_verbs.c
index 5c3c6a43a52..791252621b2 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib_verbs.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_verbs.c
@@ -33,8 +33,6 @@
  * $Id: ipoib_verbs.c 1349 2004-12-16 21:09:43Z roland $
  */
 
-#include <rdma/ib_cache.h>
-
 #include "ipoib.h"
 
 int ipoib_mcast_attach(struct net_device *dev, u16 mlid, union ib_gid *mgid)
@@ -49,7 +47,7 @@ int ipoib_mcast_attach(struct net_device *dev, u16 mlid, union ib_gid *mgid)
 	if (!qp_attr)
 		goto out;
 
-	if (ib_find_cached_pkey(priv->ca, priv->port, priv->pkey, &pkey_index)) {
+	if (ib_find_pkey(priv->ca, priv->port, priv->pkey, &pkey_index)) {
 		clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 		ret = -ENXIO;
 		goto out;
@@ -94,26 +92,16 @@ int ipoib_init_qp(struct net_device *dev)
 {
 	struct ipoib_dev_priv *priv = netdev_priv(dev);
 	int ret;
-	u16 pkey_index;
 	struct ib_qp_attr qp_attr;
 	int attr_mask;
 
-	/*
-	 * Search through the port P_Key table for the requested pkey value.
-	 * The port has to be assigned to the respective IB partition in
-	 * advance.
-	 */
-	ret = ib_find_cached_pkey(priv->ca, priv->port, priv->pkey, &pkey_index);
-	if (ret) {
-		clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
-		return ret;
-	}
-	set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
+	if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags))
+		return -1;
 
 	qp_attr.qp_state = IB_QPS_INIT;
 	qp_attr.qkey = 0;
 	qp_attr.port_num = priv->port;
-	qp_attr.pkey_index = pkey_index;
+	qp_attr.pkey_index = priv->pkey_index;
 	attr_mask =
 	    IB_QP_QKEY |
 	    IB_QP_PORT |
@@ -259,14 +247,18 @@ void ipoib_event(struct ib_event_handler *handler,
 	struct ipoib_dev_priv *priv =
 		container_of(handler, struct ipoib_dev_priv, event_handler);
 
-	if ((record->event == IB_EVENT_PORT_ERR    ||
-	     record->event == IB_EVENT_PKEY_CHANGE ||
-	     record->event == IB_EVENT_PORT_ACTIVE ||
-	     record->event == IB_EVENT_LID_CHANGE  ||
-	     record->event == IB_EVENT_SM_CHANGE   ||
-	     record->event == IB_EVENT_CLIENT_REREGISTER) &&
-	    record->element.port_num == priv->port) {
+	if (record->element.port_num != priv->port)
+		return;
+
+	if (record->event == IB_EVENT_PORT_ERR    ||
+	    record->event == IB_EVENT_PORT_ACTIVE ||
+	    record->event == IB_EVENT_LID_CHANGE  ||
+	    record->event == IB_EVENT_SM_CHANGE   ||
+	    record->event == IB_EVENT_CLIENT_REREGISTER) {
 		ipoib_dbg(priv, "Port state change event\n");
 		queue_work(ipoib_workqueue, &priv->flush_task);
+	} else if (record->event == IB_EVENT_PKEY_CHANGE) {
+		ipoib_dbg(priv, "P_Key change event on port:%d\n", priv->port);
+		queue_work(ipoib_workqueue, &priv->pkey_event_task);
 	}
 }