netdev - [PATCH net-next 12/14] net/sched: cls_api: Add extack message for unsupported action offload

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Message-Id: <20220407073533.2422896-13-idosch@nvidia.com>
Date:   Thu,  7 Apr 2022 10:35:31 +0300
From:   Ido Schimmel <idosch@...dia.com>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, kuba@...nel.org, pabeni@...hat.com,
        jhs@...atatu.com, xiyou.wangcong@...il.com, jiri@...nulli.us,
        petrm@...dia.com, jianbol@...dia.com, roid@...dia.com,
        vladbu@...dia.com, olteanv@...il.com, simon.horman@...igine.com,
        baowen.zheng@...igine.com, marcelo.leitner@...il.com,
        Ido Schimmel <idosch@...dia.com>
Subject: [PATCH net-next 12/14] net/sched: cls_api: Add extack message for unsupported action offload

For better error reporting to user space, add an extack message when the
requested action does not support offload.

Example:

 # echo 1 > /sys/kernel/tracing/events/netlink/netlink_extack/enable

 # tc filter add dev dummy0 ingress pref 1 proto all matchall skip_sw action nat ingress 192.0.2.1 198.51.100.1
 Error: cls_matchall: Failed to setup flow action.
 We have an error talking to the kernel

 # cat /sys/kernel/tracing/trace_pipe
       tc-181     [000] b..1.    88.406093: netlink_extack: msg=Action does not support offload
       tc-181     [000] .....    88.406108: netlink_extack: msg=cls_matchall: Failed to setup flow action

Signed-off-by: Ido Schimmel <idosch@...dia.com>
Reviewed-by: Petr Machata <petrm@...dia.com>
---
 net/sched/cls_api.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/net/sched/cls_api.c b/net/sched/cls_api.c
index dd711ae048ff..d8a22bedd026 100644
--- a/net/sched/cls_api.c
+++ b/net/sched/cls_api.c
@@ -3517,11 +3517,13 @@ static int tc_setup_offload_act(struct tc_action *act,
 				struct netlink_ext_ack *extack)
 {
 #ifdef CONFIG_NET_CLS_ACT
-	if (act->ops->offload_act_setup)
+	if (act->ops->offload_act_setup) {
 		return act->ops->offload_act_setup(act, entry, index_inc, true,
 						   extack);
-	else
+	} else {
+		NL_SET_ERR_MSG(extack, "Action does not support offload");
 		return -EOPNOTSUPP;
+	}
 #else
 	return 0;
 #endif
-- 
2.33.1