IB/uverbs: Pass IB_UVERBS_QPF_GRH_REQUIRED to user space

Userspace also needs to know if the port requires GRHs to properly form
the AVs it creates.
Signed-off-by: Artemy Kovalyov <artemyko@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>

drivers/infiniband/core/uverbs_cmd.c

@@ -294,6 +294,9 @@ ssize_t ib_uverbs_query_port(struct ib_uverbs_file *file,
 	resp.qkey_viol_cntr  = attr.qkey_viol_cntr;
 	resp.pkey_tbl_len    = attr.pkey_tbl_len;
 
+	if (rdma_is_grh_required(ib_dev, cmd.port_num))
+		resp.flags |= IB_UVERBS_QPF_GRH_REQUIRED;
+
 	if (rdma_cap_opa_ah(ib_dev, cmd.port_num)) {
 		resp.lid     = OPA_TO_IB_UCAST_LID(attr.lid);
 		resp.sm_lid  = OPA_TO_IB_UCAST_LID(attr.sm_lid);

include/uapi/rdma/ib_user_ioctl_verbs.h

@@ -78,6 +78,10 @@ enum ib_uverbs_query_port_cap_flags {
 	IB_UVERBS_PCF_IP_BASED_GIDS = 1 << 26,
 };
 
+enum ib_uverbs_query_port_flags {
+	IB_UVERBS_QPF_GRH_REQUIRED = 1 << 0,
+};
+
 enum ib_uverbs_flow_action_esp_keymat {
 	IB_UVERBS_FLOW_ACTION_ESP_KEYMAT_AES_GCM,
 };

include/uapi/rdma/ib_user_verbs.h

@@ -299,7 +299,8 @@ struct ib_uverbs_query_port_resp {
 	__u8  active_speed;
 	__u8  phys_state;
 	__u8  link_layer;
-	__u8  reserved[2];
+	__u8  flags;			/* see ib_uverbs_query_port_flags */
+	__u8  reserved;
 };
 
 struct ib_uverbs_alloc_pd {