Re: [PATCH v6 3/4] net: dropreason: use new __print_sym() in tracing

[Johannes Berg <johannes@sipsolutions.net>]

On Tue, 2026-09-22 at 00:36 +0200, Johannes Berg wrote:
> 
> Indeed. Something like this (untested right now, didn't manage to spin
> up a test yet):
> 
> diff --git a/tools/testing/selftests/net/openvswitch/openvswitch.sh b/tools/testing/selftests/net/openvswitch/openvswitch.sh
> index a31f7fb6882d..9b8edfcd2d1a 100755
> --- a/tools/testing/selftests/net/openvswitch/openvswitch.sh
> +++ b/tools/testing/selftests/net/openvswitch/openvswitch.sh
> @@ -234,7 +234,7 @@ ovs_drop_reason_count()
>  	local reason=$1
>  
>  	local perf_output=`perf script -i ${ovs_dir}/perf.data -F trace:event,trace`
> -	local pattern="skb:kfree_skb:.*reason: $reason"
> +	local pattern="skb:kfree_skb:.*reason: $reason$"
>  
>  	return `echo "$perf_output" | grep "$pattern" | wc -l`
>  }
> @@ -790,15 +790,6 @@ test_psample() {
>  # - drop packets and verify the right drop reason is reported
>  test_drop_reason() {
>  	which perf >/dev/null 2>&1 || return $ksft_skip
> -	which pahole >/dev/null 2>&1 || return $ksft_skip
> -
> -	ovs_drop_subsys=$(pahole -C skb_drop_reason_subsys |
> -			      awk '/OPENVSWITCH/ { print $3; }' |
> -			      tr -d ,)
> -	if [ -z "$ovs_drop_subsys" ]; then
> -		info "failed to get OVS drop subsys ID"
> -		return $ksft_skip
> -	fi
>  
>  	sbx_add "test_drop_reason" || return $?
>  
> @@ -842,7 +833,7 @@ test_drop_reason() {
>  		"in_port(2),eth(),eth_type(0x0800),ipv4(src=172.31.110.20,proto=1),icmp()" 'drop'
>  
>  	ovs_drop_record_and_run "test_drop_reason" ip netns exec client ping -c 2 172.31.110.20
> -	ovs_drop_reason_count 0x${ovs_drop_subsys}0001 # OVS_DROP_FLOW_ACTION
> +	ovs_drop_reason_count OVS_DROP_LAST_ACTION
>  	if [[ "$?" -ne "2" ]]; then
>  		info "Did not detect expected drops: $?"
>  		return 1
> @@ -859,7 +850,7 @@ test_drop_reason() {
>  
>  	ovs_drop_record_and_run \
>              "test_drop_reason" ip netns exec client nc -i 1 -zuv 172.31.110.20 6000
> -	ovs_drop_reason_count 0x${ovs_drop_subsys}0004 # OVS_DROP_EXPLICIT_ACTION_ERROR
> +	ovs_drop_reason_count OVS_DROP_EXPLICIT_WITH_ERROR
>  	if [[ "$?" -ne "1" ]]; then
>  		info "Did not detect expected explicit error drops: $?"
>  		return 1
> @@ -867,7 +858,7 @@ test_drop_reason() {
>  
>  	ovs_drop_record_and_run \
>              "test_drop_reason" ip netns exec client nc -i 1 -zuv 172.31.110.20 7000
> -	ovs_drop_reason_count 0x${ovs_drop_subsys}0003 # OVS_DROP_EXPLICIT_ACTION
> +	ovs_drop_reason_count OVS_DROP_EXPLICIT
>  	if [[ "$?" -ne "1" ]]; then
>  		info "Did not detect expected explicit drops: $?"
>  		return 1
> 

No longer untested, that works.

I might resend tomorrow, but we'll have to wait for Steven to comment on
patches 1-3 anyway.

johannes