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mlxsw: spectrum_router: Correctly reallocate adjacency entries

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mlxsw_sp_nexthop_group_mac_update() is called in one of two cases:

1) When the MAC of a nexthop needs to be updated
2) When the size of a nexthop group has changed

In the second case the adjacency entries for the nexthop group need to
be reallocated from the adjacency table. In this case we must write to
the entries the MAC addresses of all the nexthops that should be
offloaded and not only those whose MAC changed. Otherwise, these entries
would be filled with garbage data, resulting in packet loss.

Fixes: a7ff87acd995 ("mlxsw: spectrum_router: Implement next-hop routing")
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>
This commit is contained in:
Ido Schimmel 2017-01-23 11:11:42 +01:00 committed by David S. Miller
parent 6a0b76c04e
commit a59b7e0246
1 changed files with 6 additions and 4 deletions
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10
drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
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@ -1172,7 +1172,8 @@ static int mlxsw_sp_nexthop_mac_update(struct mlxsw_sp *mlxsw_sp, u32 adj_index,
static int
mlxsw_sp_nexthop_group_mac_update(struct mlxsw_sp *mlxsw_sp,
struct mlxsw_sp_nexthop_group *nh_grp)
struct mlxsw_sp_nexthop_group *nh_grp,
bool reallocate)
{
u32 adj_index = nh_grp->adj_index; /* base */
struct mlxsw_sp_nexthop *nh;
@ -1187,7 +1188,7 @@ mlxsw_sp_nexthop_group_mac_update(struct mlxsw_sp *mlxsw_sp,
continue;
}
if (nh->update) {
if (nh->update || reallocate) {
err = mlxsw_sp_nexthop_mac_update(mlxsw_sp,
adj_index, nh);
if (err)
@ -1248,7 +1249,8 @@ mlxsw_sp_nexthop_group_refresh(struct mlxsw_sp *mlxsw_sp,
/* Nothing was added or removed, so no need to reallocate. Just
* update MAC on existing adjacency indexes.
*/
err = mlxsw_sp_nexthop_group_mac_update(mlxsw_sp, nh_grp);
err = mlxsw_sp_nexthop_group_mac_update(mlxsw_sp, nh_grp,
false);
if (err) {
dev_warn(mlxsw_sp->bus_info->dev, "Failed to update neigh MAC in adjacency table.\n");
goto set_trap;
@ -1276,7 +1278,7 @@ mlxsw_sp_nexthop_group_refresh(struct mlxsw_sp *mlxsw_sp,
nh_grp->adj_index_valid = 1;
nh_grp->adj_index = adj_index;
nh_grp->ecmp_size = ecmp_size;
err = mlxsw_sp_nexthop_group_mac_update(mlxsw_sp, nh_grp);
err = mlxsw_sp_nexthop_group_mac_update(mlxsw_sp, nh_grp, true);
if (err) {
dev_warn(mlxsw_sp->bus_info->dev, "Failed to update neigh MAC in adjacency table.\n");
goto set_trap;