IB/mlx5: Fix port speed query for representors

When querying speed information for a representor in switchdev mode,
the code previously used the first device in the eswitch, which may not
match the device that actually owns the representor. In setups such as
multi-port eswitch or LAG, this led to incorrect port attributes being
reported.

Fix this by retrieving the correct core device from the representor's
eswitch before querying its port attributes.

Fixes: 27f9e0c ("net/mlx5: Lag, Add single RDMA device in multiport mode")
Signed-off-by: Or Har-Toov <[email protected]>
Reviewed-by: Mark Bloch <[email protected]>
Signed-off-by: Edward Srouji <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Leon Romanovsky <[email protected]>

Author: ohartoov

drivers/infiniband/hw/mlx5/main.c

@@ -561,12 +561,20 @@ static int mlx5_query_port_roce(struct ib_device *device, u32 port_num,
 	 * of an error it will still be zeroed out.
 	 * Use native port in case of reps
 	 */
-	if (dev->is_rep)
-		err = mlx5_query_port_ptys(mdev, out, sizeof(out), MLX5_PTYS_EN,
-					   1, 0);
-	else
-		err = mlx5_query_port_ptys(mdev, out, sizeof(out), MLX5_PTYS_EN,
-					   mdev_port_num, 0);
+	if (dev->is_rep) {
+		struct mlx5_eswitch_rep *rep;
+
+		rep = dev->port[port_num - 1].rep;
+		if (rep) {
+			mdev = mlx5_eswitch_get_core_dev(rep->esw);
+			WARN_ON(!mdev);
+		}
+		mdev_port_num = 1;
+	}
+
+	err = mlx5_query_port_ptys(mdev, out, sizeof(out), MLX5_PTYS_EN,
+				   mdev_port_num, 0);
+
 	if (err)
 		goto out;
 	ext = !!MLX5_GET_ETH_PROTO(ptys_reg, out, true, eth_proto_capability);