net/rds: Use rdma_read_gids to get connection SGID/DGID in IPv6

In IPv4, the newly introduced rdma_read_gids is used to read the SGID/DGID
for the connection which returns GID correctly for RoCE transport as well.

In IPv6, rdma_read_gids is also used. The following are why rdma_read_gids
is introduced.

rdma_addr_get_dgid() for RoCE for client side connections returns MAC
address, instead of DGID.
rdma_addr_get_sgid() for RoCE doesn't return correct SGID for IPv6 and
when more than one IP address is assigned to the netdevice.

So the transport agnostic rdma_read_gids() API is provided by rdma_cm
module.

Signed-off-by: Zhu Yanjun <[email protected]>
Acked-by: Santosh Shilimkar <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
(cherry picked from commit 53ae914)

Orabug: 28289486

Signed-off-by: Zhu Yanjun <[email protected]>
Reviewed-by: Håkon Bugge <[email protected]>

Orabug: 33590097

UEK6 => UEK7

(cherry picked from commit c5d2833)
cherry-pick-repo=UEK/production/linux-uek.git

Signed-off-by: Gerd Rausch <[email protected]>
Reviewed-by: William Kucharski <[email protected]>

Orabug: 33590087

UEK7 => LUCI

(cherry picked from commit a4ba0d2)
cherry-pick-repo=UEK/production/linux-uek.git

Signed-off-by: Gerd Rausch <[email protected]>
Reviewed-by: William Kucharski <[email protected]>

Author: Zhu Yanjun

net/rds/ib.c

@@ -319,15 +319,10 @@ static int rds6_ib_conn_info_visitor(struct rds_connection *conn,
 
 	if (rds_conn_state(conn) == RDS_CONN_UP) {
 		struct rds_ib_device *rds_ibdev;
-		struct rdma_dev_addr *dev_addr;
 
 		ic = conn->c_transport_data;
-		dev_addr = &ic->i_cm_id->route.addr.dev_addr;
-		rdma_addr_get_sgid(dev_addr,
-				   (union ib_gid *)&iinfo6->src_gid);
-		rdma_addr_get_dgid(dev_addr,
-				   (union ib_gid *)&iinfo6->dst_gid);
-
+		rdma_read_gids(ic->i_cm_id, (union ib_gid *)&iinfo6->src_gid,
+			       (union ib_gid *)&iinfo6->dst_gid);
 		rds_ibdev = ic->rds_ibdev;
 		iinfo6->max_send_wr = ic->i_send_ring.w_nr;
 		iinfo6->max_recv_wr = ic->i_recv_ring.w_nr;