RDMA/cma: Use rate from IPoIB broadcast when joining IPoIB multicast …

…groups

When joining an IPoIB multicast group, use the same rate as in the
broadcast group.  Otherwise, if the RDMA CM creates this group before
IPoIB does, it might get a different rate.  This will cause IPoIB to
fail joining to the same group later on, because IPoIB uses strict
rate selection.

Signed-off-by: Yossi Etigin <yosefe@voltaire.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

drivers/infiniband/core/cma.c

@@ -2713,6 +2713,10 @@ static int cma_join_ib_multicast(struct rdma_id_private *id_priv,
 		    IB_SA_MCMEMBER_REC_FLOW_LABEL |
 		    IB_SA_MCMEMBER_REC_TRAFFIC_CLASS;
 
+	if (id_priv->id.ps == RDMA_PS_IPOIB)
+		comp_mask |= IB_SA_MCMEMBER_REC_RATE |
+			     IB_SA_MCMEMBER_REC_RATE_SELECTOR;
+
 	mc->multicast.ib = ib_sa_join_multicast(&sa_client, id_priv->id.device,
 						id_priv->id.port_num, &rec,
 						comp_mask, GFP_KERNEL,