IB/core: Set routable RoCE gid type for ipv4/ipv6 networks

On Thu, Oct 27, 2016 at 04:36:28PM +0300, Leon Romanovsky wrote:
> From: Mark Bloch <markb@mellanox.com>
>
> If the underlying netowrk type is ipv4 or ipv6 and the device supports
> routable RoCE, prefer it so the traffic could cross subnets.
>
> Signed-off-by: Mark Bloch <markb@mellanox.com>
> Signed-off-by: Maor Gottlieb <maorg@mellanox.com>
> Signed-off-by: Leon Romanovsky <leon@kernel.org>
> ---

Hi Doug,

Please take the following v1 of this patch where I fixed spelling error
from "netowrk" to be "network".

Thanks.

>From 09f96ba3e9b4442cfb44dca04c6726e55525c9c3 Mon Sep 17 00:00:00 2001
From: Mark Bloch <markb@mellanox.com>
Date: Sun, 11 Sep 2016 06:25:10 +0000
Subject: [PATCH rdma-rc v1 3/6] IB/core: Set routable RoCE gid type for ipv4/ipv6
 networks

If the underlying network type is ipv4 or ipv6 and the device supports
routable RoCE, prefer it so the traffic could cross subnets.
Signed-off-by: Mark Bloch <markb@mellanox.com>
Signed-off-by: Maor Gottlieb <maorg@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Doug Ledford <dledford@redhat.com>

drivers/infiniband/core/cma.c

@@ -2436,6 +2436,18 @@ static int iboe_tos_to_sl(struct net_device *ndev, int tos)
 	return 0;
 }
 
+static enum ib_gid_type cma_route_gid_type(enum rdma_network_type network_type,
+					   unsigned long supported_gids,
+					   enum ib_gid_type default_gid)
+{
+	if ((network_type == RDMA_NETWORK_IPV4 ||
+	     network_type == RDMA_NETWORK_IPV6) &&
+	    test_bit(IB_GID_TYPE_ROCE_UDP_ENCAP, &supported_gids))
+		return IB_GID_TYPE_ROCE_UDP_ENCAP;
+
+	return default_gid;
+}
+
 static int cma_resolve_iboe_route(struct rdma_id_private *id_priv)
 {
 	struct rdma_route *route = &id_priv->id.route;
@@ -2461,6 +2473,8 @@ static int cma_resolve_iboe_route(struct rdma_id_private *id_priv)
 	route->num_paths = 1;
 
 	if (addr->dev_addr.bound_dev_if) {
+		unsigned long supported_gids;
+
 		ndev = dev_get_by_index(&init_net, addr->dev_addr.bound_dev_if);
 		if (!ndev) {
 			ret = -ENODEV;
@@ -2484,7 +2498,12 @@ static int cma_resolve_iboe_route(struct rdma_id_private *id_priv)
 
 		route->path_rec->net = &init_net;
 		route->path_rec->ifindex = ndev->ifindex;
-		route->path_rec->gid_type = id_priv->gid_type;
+		supported_gids = roce_gid_type_mask_support(id_priv->id.device,
+							    id_priv->id.port_num);
+		route->path_rec->gid_type =
+			cma_route_gid_type(addr->dev_addr.network,
+					   supported_gids,
+					   id_priv->gid_type);
 	}
 	if (!ndev) {
 		ret = -ENODEV;