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mlxsw: spectrum: Use a stable ECMP/LAG seed

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In order to get a consistent behavior of traffic flows across reboots /
module unload, we need to use the same ECMP/LAG seed.

Calculate the seed by hashing the base MAC of the device. This results
in a seed that is both unique (to avoid polarization) and consistent.

Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ido Schimmel 2019-04-21 07:18:34 +00:00 committed by David S. Miller
parent 4ef6cbe80d
commit fa73989f26
2 changed files with 4 additions and 4 deletions
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4
drivers/net/ethernet/mellanox/mlxsw/spectrum.c
View File

@ -21,7 +21,7 @@
#include <linux/dcbnl.h>
#include <linux/inetdevice.h>
#include <linux/netlink.h>
#include <linux/random.h>
#include <linux/jhash.h>
#include <net/switchdev.h>
#include <net/pkt_cls.h>
#include <net/tc_act/tc_mirred.h>
@ -4227,7 +4227,7 @@ static int mlxsw_sp_lag_init(struct mlxsw_sp *mlxsw_sp)
u32 seed;
int err;
get_random_bytes(&seed, sizeof(seed));
seed = jhash(mlxsw_sp->base_mac, sizeof(mlxsw_sp->base_mac), 0);
mlxsw_reg_slcr_pack(slcr_pl, MLXSW_REG_SLCR_LAG_HASH_SMAC |
MLXSW_REG_SLCR_LAG_HASH_DMAC |
MLXSW_REG_SLCR_LAG_HASH_ETHERTYPE |

4
drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
View File

@ -13,9 +13,9 @@
#include <linux/socket.h>
#include <linux/route.h>
#include <linux/gcd.h>
#include <linux/random.h>
#include <linux/if_macvlan.h>
#include <linux/refcount.h>
#include <linux/jhash.h>
#include <net/netevent.h>
#include <net/neighbour.h>
#include <net/arp.h>
@ -7831,7 +7831,7 @@ static int mlxsw_sp_mp_hash_init(struct mlxsw_sp *mlxsw_sp)
char recr2_pl[MLXSW_REG_RECR2_LEN];
u32 seed;
get_random_bytes(&seed, sizeof(seed));
seed = jhash(mlxsw_sp->base_mac, sizeof(mlxsw_sp->base_mac), 0);
mlxsw_reg_recr2_pack(recr2_pl, seed);
mlxsw_sp_mp4_hash_init(recr2_pl);
mlxsw_sp_mp6_hash_init(recr2_pl);