linux-kernel - RE: [PATCH bpf-next] bpf/devmap: remove drops variable from bq_xmit

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Message-ID: <60b06b3f6176_1cf820868@john-XPS-13-9370.notmuch>
Date:   Thu, 27 May 2021 21:02:07 -0700
From:   John Fastabend <john.fastabend@...il.com>
To:     Hangbin Liu <liuhangbin@...il.com>, bpf@...r.kernel.org
Cc:     Daniel Borkmann <daniel@...earbox.net>,
        Toke Høiland-Jørgensen <toke@...hat.com>,
        John Fastabend <john.fastabend@...il.com>,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        Hangbin Liu <liuhangbin@...il.com>
Subject: RE: [PATCH bpf-next] bpf/devmap: remove drops variable from
 bq_xmit_all()

Hangbin Liu wrote:
> As Colin pointed out, the first drops assignment after declaration will
> be overwritten by the second drops assignment before using, which makes
> it useless.
> 
> Since the drops variable will be used only once. Just remove it and
> use "cnt - sent" in trace_xdp_devmap_xmit()
> 
> Reported-by: Colin Ian King <colin.king@...onical.com>
> Fixes: cb261b594b41 ("bpf: Run devmap xdp_prog on flush instead of bulk enqueue")
> Signed-off-by: Hangbin Liu <liuhangbin@...il.com>
> ---
>  kernel/bpf/devmap.c | 7 ++-----
>  1 file changed, 2 insertions(+), 5 deletions(-)
> 

Thanks

Acked-by: John Fastabend <john.fastabend@...il.com>