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net/sched: cls_api: Add extack message for unsupported action offload

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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@nvidia.com>
Reviewed-by: Petr Machata <petrm@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ido Schimmel 2022-04-07 10:35:31 +03:00 committed by David S. Miller
parent f8fab31694
commit c440615ffb
1 changed files with 4 additions and 2 deletions
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6
net/sched/cls_api.c
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@ -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