IB/isert: set rdma cm afonly flag

This will allow both IPv4 and IPv6 sockets to bind a single port at the
same time. Same behaviour is implemented in NVMe/RDMA target.

Link: https://lore.kernel.org/r/20210524085225.29064-1-mgurtovoy@nvidia.com
Reviewed-by: Alaa Hleihel <alaa@nvidia.com>
Reviewed-by: Israel Rukshin <israelr@nvidia.com>
Signed-off-by: Max Gurtovoy <mgurtovoy@nvidia.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

drivers/infiniband/ulp/isert/ib_isert.c

@@ -2231,6 +2231,16 @@ isert_setup_id(struct isert_np *isert_np)
 	}
 	isert_dbg("id %p context %p\n", id, id->context);
 
+	/*
+	 * Allow both IPv4 and IPv6 sockets to bind a single port
+	 * at the same time.
+	 */
+	ret = rdma_set_afonly(id, 1);
+	if (ret) {
+		isert_err("rdma_set_afonly() failed: %d\n", ret);
+		goto out_id;
+	}
+
 	ret = rdma_bind_addr(id, sa);
 	if (ret) {
 		isert_err("rdma_bind_addr() failed: %d\n", ret);