netdev - Re: [PATCHv10 bpf-next 2/4] xdp: extend xdp_redirect

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Message-ID: <20210426114014.GT3465@Leo-laptop-t470s>
Date:   Mon, 26 Apr 2021 19:40:14 +0800
From:   Hangbin Liu <liuhangbin@...il.com>
To:     Jesper Dangaard Brouer <brouer@...hat.com>
Cc:     bpf@...r.kernel.org, netdev@...r.kernel.org,
        Toke Høiland-Jørgensen <toke@...hat.com>,
        Jiri Benc <jbenc@...hat.com>,
        Eelco Chaudron <echaudro@...hat.com>, ast@...nel.org,
        Daniel Borkmann <daniel@...earbox.net>,
        Lorenzo Bianconi <lorenzo.bianconi@...hat.com>,
        David Ahern <dsahern@...il.com>,
        Andrii Nakryiko <andrii.nakryiko@...il.com>,
        Alexei Starovoitov <alexei.starovoitov@...il.com>,
        John Fastabend <john.fastabend@...il.com>,
        Maciej Fijalkowski <maciej.fijalkowski@...el.com>,
        Björn Töpel <bjorn.topel@...il.com>,
        Martin KaFai Lau <kafai@...com>
Subject: Re: [PATCHv10 bpf-next 2/4] xdp: extend xdp_redirect_map with
 broadcast support

On Mon, Apr 26, 2021 at 11:53:50AM +0200, Jesper Dangaard Brouer wrote:
> Decode: perf_trace_xdp_redirect_template+0xba
>  ./scripts/faddr2line vmlinux perf_trace_xdp_redirect_template+0xba
> perf_trace_xdp_redirect_template+0xba/0x130:
> perf_trace_xdp_redirect_template at include/trace/events/xdp.h:89 (discriminator 13)
> 
> less -N net/core/filter.c
>  [...]
>    3993         if (unlikely(err))
>    3994                 goto err;
>    3995 
> -> 3996         _trace_xdp_redirect_map(dev, xdp_prog, fwd, map_type, map_id, ri->tgt_index);

Oh, the fwd in xdp xdp_redirect_map broadcast is NULL...

I will see how to fix it. Maybe assign the ingress interface to fwd?

Hangbin

>    3997         return 0;
>    3998 err:
>    3999         _trace_xdp_redirect_map_err(dev, xdp_prog, fwd, map_type, map_id, ri->tgt_index, err);
>    4000         return err;
>    4001 }
>    4002 EXPORT_SYMBOL_GPL(xdp_do_redirect);