netdev - [PATCH net-next 5/6] mlxsw: spectrum: Veto sampling if already enabled on port

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Date:   Mon, 29 Mar 2021 13:09:47 +0300
From:   Ido Schimmel <idosch@...sch.org>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, kuba@...nel.org, jiri@...dia.com,
        mlxsw@...dia.com, Ido Schimmel <idosch@...dia.com>
Subject: [PATCH net-next 5/6] mlxsw: spectrum: Veto sampling if already enabled on port

From: Ido Schimmel <idosch@...dia.com>

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@...dia.com>
Reviewed-by: Jiri Pirko <jiri@...dia.com>
---
 drivers/net/ethernet/mellanox/mlxsw/spectrum.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum.c
index efc7acb4842c..bca0354482cb 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum.c
@@ -2668,6 +2668,11 @@ mlxsw_sp_sample_trigger_params_set(struct mlxsw_sp *mlxsw_sp,
 		return mlxsw_sp_sample_trigger_node_init(mlxsw_sp, &key,
 							 params);
 
+	if (trigger_node->trigger.local_port) {
+		NL_SET_ERR_MSG_MOD(extack, "Sampling already enabled on port");
+		return -EINVAL;
+	}
+
 	if (trigger_node->params.psample_group != params->psample_group ||
 	    trigger_node->params.truncate != params->truncate ||
 	    trigger_node->params.rate != params->rate ||
-- 
2.30.2