From: Nir Dotan <nird@mellanox.com>
Date: Tue, 24 Jul 2018 17:13:14 +0300
Subject: mlxsw: spectrum_flower: Add extack messages
Patch-mainline: v4.19-rc1
Git-commit: 27c203cd148921618260cbbe3061ec290733d384
References: bsc#1112374

Return extack messages in order to explain failures
of unsupported actions, keys and invalid user input.

Signed-off-by: Nir Dotan <nird@mellanox.com>
Reviewed-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 |   21 ++++++++++++++----
 1 file changed, 17 insertions(+), 4 deletions(-)

--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_flower.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_flower.c
@@ -67,16 +67,22 @@ static int mlxsw_sp_flower_parse_actions
 	list_for_each_entry(a, &actions, list) {
 		if (is_tcf_gact_ok(a)) {
 			err = mlxsw_sp_acl_rulei_act_terminate(rulei);
-			if (err)
+			if (err) {
+				NL_SET_ERR_MSG_MOD(extack, "Cannot append terminate action");
 				return err;
+			}
 		} else if (is_tcf_gact_shot(a)) {
 			err = mlxsw_sp_acl_rulei_act_drop(rulei);
-			if (err)
+			if (err) {
+				NL_SET_ERR_MSG_MOD(extack, "Cannot append drop action");
 				return err;
+			}
 		} else if (is_tcf_gact_trap(a)) {
 			err = mlxsw_sp_acl_rulei_act_trap(rulei);
-			if (err)
+			if (err) {
+				NL_SET_ERR_MSG_MOD(extack, "Cannot append trap action");
 				return err;
+			}
 		} else if (is_tcf_gact_goto_chain(a)) {
 			u32 chain_index = tcf_gact_goto_chain_index(a);
 			struct mlxsw_sp_acl_ruleset *ruleset;
@@ -90,8 +96,10 @@ static int mlxsw_sp_flower_parse_actions
 
 			group_id = mlxsw_sp_acl_ruleset_group_id(ruleset);
 			err = mlxsw_sp_acl_rulei_act_jump(rulei, group_id);
-			if (err)
+			if (err) {
+				NL_SET_ERR_MSG_MOD(extack, "Cannot append jump action");
 				return err;
+			}
 		} else if (is_tcf_mirred_egress_redirect(a)) {
 			struct net_device *out_dev;
 			struct mlxsw_sp_fid *fid;
@@ -127,6 +135,7 @@ static int mlxsw_sp_flower_parse_actions
 							   action, vid,
 							   proto, prio, extack);
 		} else {
+			NL_SET_ERR_MSG_MOD(extack, "Unsupported action");
 			dev_err(mlxsw_sp->bus_info->dev, "Unsupported action\n");
 			return -EOPNOTSUPP;
 		}
@@ -203,6 +212,7 @@ static int mlxsw_sp_flower_parse_ports(s
 		return 0;
 
 	if (ip_proto != IPPROTO_TCP && ip_proto != IPPROTO_UDP) {
+		NL_SET_ERR_MSG_MOD(f->common.extack, "Only UDP and TCP keys are supported");
 		dev_err(mlxsw_sp->bus_info->dev, "Only UDP and TCP keys are supported\n");
 		return -EINVAL;
 	}
@@ -231,6 +241,7 @@ static int mlxsw_sp_flower_parse_tcp(str
 		return 0;
 
 	if (ip_proto != IPPROTO_TCP) {
+		NL_SET_ERR_MSG_MOD(f->common.extack, "TCP keys supported only for TCP");
 		dev_err(mlxsw_sp->bus_info->dev, "TCP keys supported only for TCP\n");
 		return -EINVAL;
 	}
@@ -257,6 +268,7 @@ static int mlxsw_sp_flower_parse_ip(stru
 		return 0;
 
 	if (n_proto != ETH_P_IP && n_proto != ETH_P_IPV6) {
+		NL_SET_ERR_MSG_MOD(f->common.extack, "IP keys supported only for IPv4/6");
 		dev_err(mlxsw_sp->bus_info->dev, "IP keys supported only for IPv4/6\n");
 		return -EINVAL;
 	}
@@ -301,6 +313,7 @@ static int mlxsw_sp_flower_parse(struct
 	      BIT(FLOW_DISSECTOR_KEY_IP) |
 	      BIT(FLOW_DISSECTOR_KEY_VLAN))) {
 		dev_err(mlxsw_sp->bus_info->dev, "Unsupported key\n");
+		NL_SET_ERR_MSG_MOD(f->common.extack, "Unsupported key");
 		return -EOPNOTSUPP;
 	}