mlxsw: spectrum: Veto sampling if already enabled on port
authorIdo Schimmel <idosch@nvidia.com>
Mon, 29 Mar 2021 10:09:47 +0000 (13:09 +0300)
committerDavid S. Miller <davem@davemloft.net>
Mon, 29 Mar 2021 20:37:26 +0000 (13:37 -0700)
commit17b96a5cbe3d0c743c49776e90d892844c226a56
treee4310c31fb477593bd5f71d9a4a46e3d93ef4b39
parentc3572a0b731fc0de13afef300f1f5afb929e4d4c
mlxsw: spectrum: Veto sampling if already enabled on port

The per-port sampling triggers (i.e., ingress / egress) cannot be
enabled twice. Meaning, the below configuration will not result in
packets being sampled twice:

 # tc filter add dev swp1 ingress matchall skip_sw action sample rate 100 group 1
 # tc filter add dev swp1 ingress matchall skip_sw action sample rate 100 group 1

Therefore, reject such configurations.

Fixes: 90f53c53ec4a ("mlxsw: spectrum: Start using sampling triggers hash table")
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
drivers/net/ethernet/mellanox/mlxsw/spectrum.c