From: Danielle Ratson <danieller@mellanox.com>
Date: Thu, 26 Sep 2019 14:43:40 +0300
Subject: mlxsw: spectrum_flower: Fail in case user specifies multiple mirror
 actions
Patch-mainline: v5.4-rc1
Git-commit: 52feb8b588f6d23673dd7cc2b44b203493b627f6
References: bsc#1112374

The ASIC can only mirror a packet to one port, but when user is trying
to set more than one mirror action, it doesn't fail.

Add a check if more than one mirror action was specified per rule and if so,
fail for not being supported.

Fixes: d0d13c1858a11 ("mlxsw: spectrum_acl: Add support for mirror action")
Signed-off-by: Danielle Ratson <danieller@mellanox.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/ethernet/mellanox/mlxsw/spectrum_flower.c |    6 ++++++
 1 file changed, 6 insertions(+)

--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_flower.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_flower.c
@@ -21,6 +21,7 @@ static int mlxsw_sp_flower_parse_actions
 					 struct netlink_ext_ack *extack)
 {
 	const struct tc_action *a;
+	int mirror_act_count = 0;
 	int err, i;
 
 	if (!tcf_exts_has_actions(exts))
@@ -87,6 +88,11 @@ static int mlxsw_sp_flower_parse_actions
 		} else if (is_tcf_mirred_egress_mirror(a)) {
 			struct net_device *out_dev = tcf_mirred_dev(a);
 
+			if (mirror_act_count++) {
+				NL_SET_ERR_MSG_MOD(extack, "Multiple mirror actions per rule are not supported");
+				return -EOPNOTSUPP;
+			}
+
 			err = mlxsw_sp_acl_rulei_act_mirror(mlxsw_sp, rulei,
 							    block, out_dev,
 							    extack);