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authorDoug Ledford <dledford@redhat.com>2015-09-03 23:05:58 +0200
committerDoug Ledford <dledford@redhat.com>2015-09-03 23:05:58 +0200
commitc3acdc06a95ff20d920220ecb931186b0bb22c42 (patch)
tree5e433081f0f017bf0f6e2a7c4b7d331ace528bf0
parentIB/srp: Fix possible protection fault (diff)
downloadlinux-c3acdc06a95ff20d920220ecb931186b0bb22c42.tar.xz
linux-c3acdc06a95ff20d920220ecb931186b0bb22c42.zip
IB/ipoib: Clean up send-only multicast joins
Even though we don't expect the group to be created by the SM we sill need to provide all the parameters to force the SM to validate they are correct. Signed-off-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com> Signed-off-by: Doug Ledford <dledford@redhat.com>
-rw-r--r--drivers/infiniband/ulp/ipoib/ipoib_multicast.c38
1 files changed, 27 insertions, 11 deletions
diff --git a/drivers/infiniband/ulp/ipoib/ipoib_multicast.c b/drivers/infiniband/ulp/ipoib/ipoib_multicast.c
index 0d23e0568deb..5e2db3b7c8bb 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib_multicast.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_multicast.c
@@ -448,8 +448,7 @@ out_locked:
return status;
}
-static void ipoib_mcast_join(struct net_device *dev, struct ipoib_mcast *mcast,
- int create)
+static void ipoib_mcast_join(struct net_device *dev, struct ipoib_mcast *mcast)
{
struct ipoib_dev_priv *priv = netdev_priv(dev);
struct ib_sa_multicast *multicast;
@@ -471,7 +470,14 @@ static void ipoib_mcast_join(struct net_device *dev, struct ipoib_mcast *mcast,
IB_SA_MCMEMBER_REC_PKEY |
IB_SA_MCMEMBER_REC_JOIN_STATE;
- if (create) {
+ if (mcast != priv->broadcast) {
+ /*
+ * RFC 4391:
+ * The MGID MUST use the same P_Key, Q_Key, SL, MTU,
+ * and HopLimit as those used in the broadcast-GID. The rest
+ * of attributes SHOULD follow the values used in the
+ * broadcast-GID as well.
+ */
comp_mask |=
IB_SA_MCMEMBER_REC_QKEY |
IB_SA_MCMEMBER_REC_MTU_SELECTOR |
@@ -492,6 +498,22 @@ static void ipoib_mcast_join(struct net_device *dev, struct ipoib_mcast *mcast,
rec.sl = priv->broadcast->mcmember.sl;
rec.flow_label = priv->broadcast->mcmember.flow_label;
rec.hop_limit = priv->broadcast->mcmember.hop_limit;
+
+ /*
+ * Historically Linux IPoIB has never properly supported SEND
+ * ONLY join. It emulated it by not providing all the required
+ * attributes, which is enough to prevent group creation and
+ * detect if there are full members or not. A major problem
+ * with supporting SEND ONLY is detecting when the group is
+ * auto-destroyed as IPoIB will cache the MLID..
+ */
+#if 1
+ if (test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags))
+ comp_mask &= ~IB_SA_MCMEMBER_REC_TRAFFIC_CLASS;
+#else
+ if (test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags))
+ rec.join_state = 4;
+#endif
}
multicast = ib_sa_join_multicast(&ipoib_sa_client, priv->ca, priv->port,
@@ -517,7 +539,6 @@ void ipoib_mcast_join_task(struct work_struct *work)
struct ib_port_attr port_attr;
unsigned long delay_until = 0;
struct ipoib_mcast *mcast = NULL;
- int create = 1;
if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags))
return;
@@ -566,7 +587,6 @@ void ipoib_mcast_join_task(struct work_struct *work)
if (IS_ERR_OR_NULL(priv->broadcast->mc) &&
!test_bit(IPOIB_MCAST_FLAG_BUSY, &priv->broadcast->flags)) {
mcast = priv->broadcast;
- create = 0;
if (mcast->backoff > 1 &&
time_before(jiffies, mcast->delay_until)) {
delay_until = mcast->delay_until;
@@ -590,12 +610,8 @@ void ipoib_mcast_join_task(struct work_struct *work)
/* Found the next unjoined group */
init_completion(&mcast->done);
set_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
- if (test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags))
- create = 0;
- else
- create = 1;
spin_unlock_irq(&priv->lock);
- ipoib_mcast_join(dev, mcast, create);
+ ipoib_mcast_join(dev, mcast);
spin_lock_irq(&priv->lock);
} else if (!delay_until ||
time_before(mcast->delay_until, delay_until))
@@ -618,7 +634,7 @@ out:
}
spin_unlock_irq(&priv->lock);
if (mcast)
- ipoib_mcast_join(dev, mcast, create);
+ ipoib_mcast_join(dev, mcast);
}
int ipoib_mcast_start_thread(struct net_device *dev)