netdev - Re: [PATCHv2 iproute2] u32: fix TC_U32

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Date:   Wed, 1 Mar 2023 14:55:37 -0300
From:   Victor Nogueira <victor@...atatu.com>
To:     Hangbin Liu <liuhangbin@...il.com>, netdev@...r.kernel.org
Cc:     David Ahern <dsahern@...nel.org>,
        Stephen Hemminger <stephen@...workplumber.org>,
        Jamal Hadi Salim <jhs@...atatu.com>
Subject: Re: [PATCHv2 iproute2] u32: fix TC_U32_TERMINAL printing

On 01/03/2023 11:21, Hangbin Liu wrote:
> We previously printed an asterisk if there was no 'sel' or 'TC_U32_TERMINAL'
> flag. However, commit 1ff22754 ("u32: fix json formatting of flowid")
> changed the logic to print an asterisk only if there is a 'TC_U32_TERMINAL'
> flag. Therefore, we need to fix this regression.
> 
> Before the fix, the tdc u32 test failed:
> 
> 1..11
> not ok 1 afa9 - Add u32 with source match
>          Could not match regex pattern. Verify command output:
> filter protocol ip pref 1 u32 chain 0
> filter protocol ip pref 1 u32 chain 0 fh 800: ht divisor 1
> filter protocol ip pref 1 u32 chain 0 fh 800::800 order 2048 key ht 800 bkt 0 *flowid 1:1 not_in_hw
>    match 7f000001/ffffffff at 12
>          action order 1: gact action pass
>           random type none pass val 0
>           index 1 ref 1 bind 1
> 
> After fix, the test passed:
> 1..11
> ok 1 afa9 - Add u32 with source match
> 
> Fixes: 1ff227545ce1 ("u32: fix json formatting of flowid")
> Signed-off-by: Hangbin Liu <liuhangbin@...il.com>

Reviewed-by: Victor Nogueira <victor@...atatu.com>

> ---
> v2: add tdc test result in the commit description
> ---
>   tc/f_u32.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/tc/f_u32.c b/tc/f_u32.c
> index bfe9e5f9..de2d0c9e 100644
> --- a/tc/f_u32.c
> +++ b/tc/f_u32.c
> @@ -1273,7 +1273,7 @@ static int u32_print_opt(struct filter_util *qu, FILE *f, struct rtattr *opt,
>   	if (tb[TCA_U32_CLASSID]) {
>   		__u32 classid = rta_getattr_u32(tb[TCA_U32_CLASSID]);
>   		SPRINT_BUF(b1);
> -		if (sel && (sel->flags & TC_U32_TERMINAL))
> +		if (!sel || !(sel->flags & TC_U32_TERMINAL))
>   			print_string(PRINT_FP, NULL, "*", NULL);
>   
>   		print_string(PRINT_ANY, "flowid", "flowid %s ",