From: Ido Schimmel <idosch@nvidia.com>
Date: Thu, 7 Apr 2022 10:35:27 +0300
Subject: net/sched: act_police: Add extack messages for offload failure
Patch-mainline: v5.19-rc1
Git-commit: b50e462bc22df4488ec04d85606646e3db5952b8
References: jsc#PED-1549
For better error reporting to user space, add extack messages when
police action offload fails.
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 police rate 100Mbit burst 10000
Error: cls_matchall: Failed to setup flow action.
We have an error talking to the kernel
# cat /sys/kernel/tracing/trace_pipe
tc-182 [000] b..1. 21.592969: netlink_extack: msg=act_police: Offload not supported when conform/exceed action is "reclassify"
tc-182 [000] ..... 21.592982: netlink_extack: msg=cls_matchall: Failed to setup flow action
# tc filter add dev dummy0 ingress pref 1 proto all matchall skip_sw action police rate 100Mbit burst 10000 conform-exceed drop/continue
Error: cls_matchall: Failed to setup flow action.
We have an error talking to the kernel
# cat /sys/kernel/tracing/trace_pipe
tc-184 [000] b..1. 38.882579: netlink_extack: msg=act_police: Offload not supported when conform/exceed action is "continue"
tc-184 [000] ..... 38.882593: 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>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
net/sched/act_police.c | 17 ++++++++++++++---
1 file changed, 14 insertions(+), 3 deletions(-)
--- a/net/sched/act_police.c
+++ b/net/sched/act_police.c
@@ -405,7 +405,8 @@ static int tcf_police_search(struct net
return tcf_idr_search(tn, a, index);
}
-static int tcf_police_act_to_flow_act(int tc_act, u32 *extval)
+static int tcf_police_act_to_flow_act(int tc_act, u32 *extval,
+ struct netlink_ext_ack *extack)
{
int act_id = -EOPNOTSUPP;
@@ -416,12 +417,20 @@ static int tcf_police_act_to_flow_act(in
act_id = FLOW_ACTION_DROP;
else if (tc_act == TC_ACT_PIPE)
act_id = FLOW_ACTION_PIPE;
+ else if (tc_act == TC_ACT_RECLASSIFY)
+ NL_SET_ERR_MSG_MOD(extack, "Offload not supported when conform/exceed action is \"reclassify\"");
+ else
+ NL_SET_ERR_MSG_MOD(extack, "Unsupported conform/exceed action offload");
} else if (TC_ACT_EXT_CMP(tc_act, TC_ACT_GOTO_CHAIN)) {
act_id = FLOW_ACTION_GOTO;
*extval = tc_act & TC_ACT_EXT_VAL_MASK;
} else if (TC_ACT_EXT_CMP(tc_act, TC_ACT_JUMP)) {
act_id = FLOW_ACTION_JUMP;
*extval = tc_act & TC_ACT_EXT_VAL_MASK;
+ } else if (tc_act == TC_ACT_UNSPEC) {
+ NL_SET_ERR_MSG_MOD(extack, "Offload not supported when conform/exceed action is \"continue\"");
+ } else {
+ NL_SET_ERR_MSG_MOD(extack, "Unsupported conform/exceed action offload");
}
return act_id;
@@ -453,14 +462,16 @@ static int tcf_police_offload_act_setup(
entry->police.mtu = tcf_police_tcfp_mtu(act);
act_id = tcf_police_act_to_flow_act(police->tcf_action,
- &entry->police.exceed.extval);
+ &entry->police.exceed.extval,
+ extack);
if (act_id < 0)
return act_id;
entry->police.exceed.act_id = act_id;
act_id = tcf_police_act_to_flow_act(p->tcfp_result,
- &entry->police.notexceed.extval);
+ &entry->police.notexceed.extval,
+ extack);
if (act_id < 0)
return act_id;