RDMA/ipoib: Remove racy Subnet Manager sendonly join checks

When a system receives a REREG event from the SM, then the SM information
in the kernel is marked as invalid and a request is sent to the SM to
update the information. The SM information is invalid in that time period.

However, receiving a REREG also occurs simultaneously in user space
applications that are now trying to rejoin the multicast groups. Some of
those may be sendonly multicast groups which are then failing.

If the SM information is invalid then ib_sa_sendonly_fullmem_support()
returns false. That is wrong because it just means that we do not know yet
if the potentially new SM supports sendonly joins.

Sendonly join was introduced in 2015 and all the Subnet managers have
supported it ever since. So there is no point in checking if a subnet
manager supports it.

Should an old opensm get a request for a sendonly join then the request
will fail. The code that is removed here accomodated that situation and
fell back to a full join.

Falling back to a full join is problematic in itself. The reason to use
the sendonly join was to reduce the traffic on the Infiniband fabric
otherwise one could have just stayed with the regular join.  So this patch
may cause users of very old opensms to discover that lots of traffic
needlessly crosses their IB fabrics.

Link: https://lore.kernel.org/r/alpine.DEB.2.22.394.2101281845160.13303@www.lameter.com
Signed-off-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

5 files changed, 1 insertions, 50 deletions

diff --git a/drivers/infiniband/core/cma.c b/drivers/infiniband/core/cma.c
index c51b84b2d2f3..58ee7004c8d8 100644
--- a/drivers/infiniband/core/cma.c
+++ b/drivers/infiniband/core/cma.c
@@ -4542,17 +4542,6 @@ static int cma_join_ib_multicast(struct rdma_id_private *id_priv,
 	rec.pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr));
 	rec.join_state = mc->join_state;
 
-	if ((rec.join_state == BIT(SENDONLY_FULLMEMBER_JOIN)) &&
-	    (!ib_sa_sendonly_fullmem_support(&sa_client,
-					     id_priv->id.device,
-					     id_priv->id.port_num))) {
-		dev_warn(
-			&id_priv->id.device->dev,
-			"RDMA CM: port %u Unable to multicast join: SM doesn't support Send Only Full Member option\n",
-			id_priv->id.port_num);
-		return -EOPNOTSUPP;
-	}
-
 	comp_mask = IB_SA_MCMEMBER_REC_MGID | IB_SA_MCMEMBER_REC_PORT_GID |
 		    IB_SA_MCMEMBER_REC_PKEY | IB_SA_MCMEMBER_REC_JOIN_STATE |
 		    IB_SA_MCMEMBER_REC_QKEY | IB_SA_MCMEMBER_REC_SL |
diff --git a/drivers/infiniband/core/sa_query.c b/drivers/infiniband/core/sa_query.c
index 5bd047042e68..9ef1a355131b 100644
--- a/drivers/infiniband/core/sa_query.c
+++ b/drivers/infiniband/core/sa_query.c
@@ -1951,30 +1951,6 @@ err1:
 }
 EXPORT_SYMBOL(ib_sa_guid_info_rec_query);
 
-bool ib_sa_sendonly_fullmem_support(struct ib_sa_client *client,
-				    struct ib_device *device,
-				    u8 port_num)
-{
-	struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
-	struct ib_sa_port *port;
-	bool ret = false;
-	unsigned long flags;
-
-	if (!sa_dev)
-		return ret;
-
-	port  = &sa_dev->port[port_num - sa_dev->start_port];
-
-	spin_lock_irqsave(&port->classport_lock, flags);
-	if ((port->classport_info.valid) &&
-	    (port->classport_info.data.type == RDMA_CLASS_PORT_INFO_IB))
-		ret = ib_get_cpi_capmask2(&port->classport_info.data.ib)
-			& IB_SA_CAP_MASK2_SENDONLY_FULL_MEM_SUPPORT;
-	spin_unlock_irqrestore(&port->classport_lock, flags);
-	return ret;
-}
-EXPORT_SYMBOL(ib_sa_sendonly_fullmem_support);
-
 struct ib_classport_info_context {
 	struct completion	done;
 	struct ib_sa_query	*sa_query;
diff --git a/drivers/infiniband/ulp/ipoib/ipoib.h b/drivers/infiniband/ulp/ipoib/ipoib.h
index 3440dc48d02c..179ff1d068e5 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib.h
+++ b/drivers/infiniband/ulp/ipoib/ipoib.h
@@ -413,7 +413,6 @@ struct ipoib_dev_priv {
 	u64	hca_caps;
 	struct ipoib_ethtool_st ethtool;
 	unsigned int max_send_sge;
-	bool sm_fullmember_sendonly_support;
 	const struct net_device_ops	*rn_ops;
 };
 
diff --git a/drivers/infiniband/ulp/ipoib/ipoib_main.c b/drivers/infiniband/ulp/ipoib/ipoib_main.c
index a6f413491321..e16b40c09f82 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib_main.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_main.c
@@ -141,8 +141,6 @@ int ipoib_open(struct net_device *dev)
 
 	set_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
 
-	priv->sm_fullmember_sendonly_support = false;
-
 	if (ipoib_ib_dev_open(dev)) {
 		if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags))
 			return 0;
diff --git a/drivers/infiniband/ulp/ipoib/ipoib_multicast.c b/drivers/infiniband/ulp/ipoib/ipoib_multicast.c
index e3e4447c0f51..5b3154503bf4 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib_multicast.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_multicast.c
@@ -334,15 +334,6 @@ void ipoib_mcast_carrier_on_task(struct work_struct *work)
 		return;
 	}
 	/*
-	 * Check if can send sendonly MCG's with sendonly-fullmember join state.
-	 * It done here after the successfully join to the broadcast group,
-	 * because the broadcast group must always be joined first and is always
-	 * re-joined if the SM changes substantially.
-	 */
-	priv->sm_fullmember_sendonly_support =
-		ib_sa_sendonly_fullmem_support(&ipoib_sa_client,
-					       priv->ca, priv->port);
-	/*
 	 * Take rtnl_lock to avoid racing with ipoib_stop() and
 	 * turning the carrier back on while a device is being
 	 * removed.  However, ipoib_stop() will attempt to flush
@@ -537,9 +528,7 @@ static int ipoib_mcast_join(struct net_device *dev, struct ipoib_mcast *mcast)
 		 * most closely emulates the behavior, from a user space
 		 * application perspective, of Ethernet multicast operation.
 		 */
-		if (test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags) &&
-		    priv->sm_fullmember_sendonly_support)
-			/* SM supports sendonly-fullmember, otherwise fallback to full-member */
+		if (test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags))
 			rec.join_state = SENDONLY_FULLMEMBER_JOIN;
 	}
 	spin_unlock_irq(&priv->lock);