IB/providers: Avoid zero GID check for RoCE

Now that the IB core GID cache ensures that a zero GID doesn't exist in
the GID table remove zero GID checks from the provider drivers for
clarity.
Reviewed-by: Mark Bloch <markb@mellanox.com>
Signed-off-by: Parav Pandit <parav@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

drivers/infiniband/hw/mlx4/main.c

@@ -411,9 +411,6 @@ int mlx4_ib_gid_index_to_real_index(struct mlx4_ib_dev *ibdev,
 	if (attr.ndev)
 		dev_put(attr.ndev);
 
-	if (!memcmp(&gid, &zgid, sizeof(gid)))
-		return -EINVAL;
-
 	spin_lock_irqsave(&iboe->lock, flags);
 	port_gid_table = &iboe->gids[port_num - 1];
 

drivers/infiniband/hw/mlx4/qp.c

@@ -2370,8 +2370,6 @@ static int __mlx4_ib_modify_qp(void *src, enum mlx4_ib_source_type src_type,
 
 			status = ib_get_cached_gid(&dev->ib_dev, port_num,
 						   index, &gid, &gid_attr);
-			if (!status && !memcmp(&gid, &zgid, sizeof(gid)))
-				status = -ENOENT;
 			if (!status && gid_attr.ndev) {
 				vlan = rdma_vlan_dev_vlan_id(gid_attr.ndev);
 				memcpy(smac, gid_attr.ndev->dev_addr, ETH_ALEN);

drivers/infiniband/hw/ocrdma/ocrdma_hw.c

@@ -2494,7 +2494,7 @@ static int ocrdma_set_av_params(struct ocrdma_qp *qp,
 {
 	int status;
 	struct rdma_ah_attr *ah_attr = &attrs->ah_attr;
-	union ib_gid sgid, zgid;
+	union ib_gid sgid;
 	struct ib_gid_attr sgid_attr;
 	u32 vlan_id = 0xFFFF;
 	u8 mac_addr[6], hdr_type;
@@ -2533,10 +2533,6 @@ static int ocrdma_set_av_params(struct ocrdma_qp *qp,
 		dev_put(sgid_attr.ndev);
 	}
 
-	memset(&zgid, 0, sizeof(zgid));
-	if (!memcmp(&sgid, &zgid, sizeof(zgid)))
-		return -EINVAL;
-
 	qp->sgid_idx = grh->sgid_index;
 	memcpy(&cmd->params.sgid[0], &sgid.raw[0], sizeof(cmd->params.sgid));
 	status = ocrdma_resolve_dmac(dev, ah_attr, &mac_addr[0]);

drivers/infiniband/hw/qedr/qedr_roce_cm.c

@@ -420,12 +420,6 @@ static inline int qedr_gsi_build_header(struct qedr_dev *dev,
 		dev_put(sgid_attr.ndev);
 	}
 
-	if (!memcmp(&sgid, &zgid, sizeof(sgid))) {
-		DP_ERR(dev, "gsi post send: GID not found GID index %d\n",
-		       grh->sgid_index);
-		return -ENOENT;
-	}
-
 	has_udp = (sgid_attr.gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP);
 	if (!has_udp) {
 		/* RoCE v1 */

drivers/infiniband/hw/qedr/verbs.c

@@ -1093,9 +1093,6 @@ static inline int get_gid_info_from_table(struct ib_qp *ibqp,
 	if (rc)
 		return rc;
 
-	if (!memcmp(&gid, &zgid, sizeof(gid)))
-		return -ENOENT;
-
 	if (gid_attr.ndev) {
 		qp_params->vlan_id = rdma_vlan_dev_vlan_id(gid_attr.ndev);