From: Ido Schimmel <idosch@mellanox.com>
Date: Tue, 18 Jul 2017 10:10:19 +0200
Subject: mlxsw: spectrum_router: Don't assume neighbour type
Patch-mainline: v4.14-rc1
Git-commit: 58adf2c48003d1a7469fe0d0b438300ab6173031
References: bsc#1112374

Thankfully, the neighbour subsystem is agnostic to the upper protocol
and used by both IPv4 and IPv6. By removing assumptions regarding the
neighbour type we can thus re-use much of the neighbour-related code for
both IPv4 and IPv6.

For each nexthop, store its gateway IP and for nexthop group store the
neighbour table used by its nexthops.

Use this information throughout the code and remove assumption about the
neighbour type.

Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c |   11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
@@ -1437,6 +1437,7 @@ struct mlxsw_sp_nexthop {
 						*/
 	struct rhash_head ht_node;
 	struct mlxsw_sp_nexthop_key key;
+	unsigned char gw_addr[sizeof(struct in6_addr)];
 	struct mlxsw_sp_rif *rif;
 	u8 should_offload:1, /* set indicates this neigh is connected and
 			      * should be put to KVD linear area of this group.
@@ -1457,6 +1458,7 @@ struct mlxsw_sp_nexthop_group_key {
 struct mlxsw_sp_nexthop_group {
 	struct rhash_head ht_node;
 	struct list_head fib_list; /* list of fib entries that use this group */
+	struct neigh_table *neigh_tbl;
 	struct mlxsw_sp_nexthop_group_key key;
 	u8 adj_index_valid:1,
 	   gateway:1; /* routes using the group use a gateway */
@@ -1781,7 +1783,6 @@ static int mlxsw_sp_nexthop_neigh_init(s
 				       struct mlxsw_sp_nexthop *nh)
 {
 	struct mlxsw_sp_neigh_entry *neigh_entry;
-	struct fib_nh *fib_nh = nh->key.fib_nh;
 	struct neighbour *n;
 	u8 nud_state, dead;
 	int err;
@@ -1794,9 +1795,10 @@ static int mlxsw_sp_nexthop_neigh_init(s
 	 * The reference is taken either in neigh_lookup() or
 	 * in neigh_create() in case n is not found.
 	 */
-	n = neigh_lookup(&arp_tbl, &fib_nh->nh_gw, fib_nh->nh_dev);
+	n = neigh_lookup(nh->nh_grp->neigh_tbl, &nh->gw_addr, nh->rif->dev);
 	if (!n) {
-		n = neigh_create(&arp_tbl, &fib_nh->nh_gw, fib_nh->nh_dev);
+		n = neigh_create(nh->nh_grp->neigh_tbl, &nh->gw_addr,
+				 nh->rif->dev);
 		if (IS_ERR(n))
 			return PTR_ERR(n);
 		neigh_event_send(n, NULL);
@@ -1870,6 +1872,7 @@ static int mlxsw_sp_nexthop_init(struct
 
 	nh->nh_grp = nh_grp;
 	nh->key.fib_nh = fib_nh;
+	memcpy(&nh->gw_addr, &fib_nh->nh_gw, sizeof(fib_nh->nh_gw));
 	err = mlxsw_sp_nexthop_insert(mlxsw_sp, nh);
 	if (err)
 		return err;
@@ -1968,6 +1971,8 @@ mlxsw_sp_nexthop_group_create(struct mlx
 	if (!nh_grp)
 		return ERR_PTR(-ENOMEM);
 	INIT_LIST_HEAD(&nh_grp->fib_list);
+	nh_grp->neigh_tbl = &arp_tbl;
+
 	nh_grp->gateway = fi->fib_nh->nh_scope == RT_SCOPE_LINK;
 	nh_grp->count = fi->fib_nhs;
 	nh_grp->key.fi = fi;