netdev - Re: [PATCH net] selftests/bpf: set gopt opt_class to 0 if get tunnel opt failed

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Date:   Fri, 12 Mar 2021 09:56:17 +0800
From:   Hangbin Liu <liuhangbin@...il.com>
To:     netdev@...r.kernel.org
Cc:     Jakub Kicinski <kuba@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Yi-Hung Wei <yihung.wei@...il.com>,
        David Miller <davem@...emloft.net>, bpf@...r.kernel.org,
        William Tu <u9012063@...il.com>
Subject: Re: [PATCH net] selftests/bpf: set gopt opt_class to 0 if get tunnel
 opt failed

Hi David,

May I ask what's the status of this patch? From patchwork[1] the state is
accepted. But I can't find the fix on net or net-next.

[1] https://patchwork.kernel.org/project/netdevbpf/patch/20210309032214.2112438-1-liuhangbin@gmail.com/

Thanks
Hangbin
On Tue, Mar 09, 2021 at 11:22:14AM +0800, Hangbin Liu wrote:
> When fixing the bpf test_tunnel.sh genve failure. I only fixed
> the IPv4 part but forgot the IPv6 issue. Similar with the IPv4
> fixes 557c223b643a ("selftests/bpf: No need to drop the packet when
> there is no geneve opt"), when there is no tunnel option and
> bpf_skb_get_tunnel_opt() returns error, there is no need to drop the
> packets and break all geneve rx traffic. Just set opt_class to 0 and
> keep returning TC_ACT_OK at the end.
> 
> Fixes: 933a741e3b82 ("selftests/bpf: bpf tunnel test.")
> Signed-off-by: Hangbin Liu <liuhangbin@...il.com>
> ---
>  tools/testing/selftests/bpf/progs/test_tunnel_kern.c | 6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)
> 
> diff --git a/tools/testing/selftests/bpf/progs/test_tunnel_kern.c b/tools/testing/selftests/bpf/progs/test_tunnel_kern.c
> index 9afe947cfae9..ba6eadfec565 100644
> --- a/tools/testing/selftests/bpf/progs/test_tunnel_kern.c
> +++ b/tools/testing/selftests/bpf/progs/test_tunnel_kern.c
> @@ -508,10 +508,8 @@ int _ip6geneve_get_tunnel(struct __sk_buff *skb)
>  	}
>  
>  	ret = bpf_skb_get_tunnel_opt(skb, &gopt, sizeof(gopt));
> -	if (ret < 0) {
> -		ERROR(ret);
> -		return TC_ACT_SHOT;
> -	}
> +	if (ret < 0)
> +		gopt.opt_class = 0;
>  
>  	bpf_trace_printk(fmt, sizeof(fmt),
>  			key.tunnel_id, key.remote_ipv4, gopt.opt_class);
> -- 
> 2.26.2
>