[PATCH v3 1/1] IPoIB: Improve parent interface p_key handling.

[Alex Estrin <alex.estrin-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>]

With reference to commit c2904141696ee19551f1553944446f23cdd5d95e
(IPoIB: Fix pkey change flow for virtualization environments)
It was noticed that parent interface keeps sending broadcast group
join requests if p_key index 0 is invalid. That creates unnecessary
noise on a fabric:

ib0: multicast join failed for ff12:401b:8000:0000:0000:0000:ffff:ffff,
status -22

Proposed patch re-init resources, then brings interface
up only if p_key idx 0 is valid either on bootup or on PKEY_CHANGE event.
Original code could run multicast task regardless of p_key value,
which we want to avoid.


Reviewed-by: Ira Weiny <ira.weiny-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
Signed-off-by: Alex Estrin <alex.estrin-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
---

Changes from v2:
Handle pkey change event for a case when interface is down
(pointed out by Erez Shitrit <erezsh-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org>).

Changes from v1:
p_key check for 'Invalid' value was moved to
ipoib_pkey_dev_check_presence() that is used now in ipoib_ib_dev_open()
for p_key validation.
Whitespace and format adjusted.

 drivers/infiniband/ulp/ipoib/ipoib_ib.c |   35 ++++++++++++++++++------------
 1 files changed, 21 insertions(+), 14 deletions(-)

diff --git a/drivers/infiniband/ulp/ipoib/ipoib_ib.c b/drivers/infiniband/ulp/ipoib/ipoib_ib.c
index 6a7003d..a2af996 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib_ib.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_ib.c
@@ -52,6 +52,7 @@ MODULE_PARM_DESC(data_debug_level,
 #endif
 
 static DEFINE_MUTEX(pkey_mutex);
+static void ipoib_pkey_dev_check_presence(struct net_device *dev);
 
 struct ipoib_ah *ipoib_create_ah(struct net_device *dev,
 				 struct ib_pd *pd, struct ib_ah_attr *attr)
@@ -669,12 +670,13 @@ 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);
+	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;
 	}
-	set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 
 	ret = ipoib_init_qp(dev);
 	if (ret) {
@@ -712,9 +714,10 @@ dev_stop:
 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_pkey(priv->ca, priv->port, priv->pkey, &pkey_index))
+	if (!(priv->pkey & 0x7fff) ||
+		ib_find_pkey(priv->ca, priv->port, priv->pkey,
+				&priv->pkey_index))
 		clear_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
 	else
 		set_bit(IPOIB_PKEY_ASSIGNED, &priv->flags);
@@ -987,15 +990,17 @@ static void __ipoib_ib_dev_flush(struct ipoib_dev_priv *priv,
 	up_read(&priv->vlan_rwsem);
 
 	if (!test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags)) {
-		/* for non-child devices must check/update the pkey value here */
-		if (level == IPOIB_FLUSH_HEAVY &&
-		    !test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags))
-			update_parent_pkey(priv);
-		ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_INITIALIZED not set.\n");
-		return;
+		if (level != IPOIB_FLUSH_HEAVY) {
+			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 &&
+			!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags))
+			update_parent_pkey(priv);
 		ipoib_dbg(priv, "Not flushing - IPOIB_FLAG_ADMIN_UP not set.\n");
 		return;
 	}
@@ -1038,8 +1043,10 @@ static void __ipoib_ib_dev_flush(struct ipoib_dev_priv *priv,
 		ipoib_ib_dev_down(dev, 0);
 
 	if (level == IPOIB_FLUSH_HEAVY) {
-		ipoib_ib_dev_stop(dev, 0);
-		ipoib_ib_dev_open(dev);
+		if (test_bit(IPOIB_FLAG_INITIALIZED, &priv->flags))
+			ipoib_ib_dev_stop(dev, 0);
+		if (ipoib_ib_dev_open(dev) != 0)
+			return;
 	}
 
 	/*
-- 
1.7.0.7

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