linux-kernel - Re: [PATCH v4 net-next] packet: add a generic drop reason for receive

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Message-ID: <656e63e6b166a_37b1262943c@willemb.c.googlers.com.notmuch>
Date:   Mon, 04 Dec 2023 18:42:30 -0500
From:   Willem de Bruijn <willemdebruijn.kernel@...il.com>
To:     Eric Dumazet <edumazet@...gle.com>, Yan Zhai <yan@...udflare.com>
Cc:     netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Willem de Bruijn <willemdebruijn.kernel@...il.com>,
        linux-kernel@...r.kernel.org, kernel-team@...udflare.com,
        Jesper Brouer <jesper@...udflare.com>
Subject: Re: [PATCH v4 net-next] packet: add a generic drop reason for receive

Eric Dumazet wrote:
> On Mon, Dec 4, 2023 at 8:33 PM Yan Zhai <yan@...udflare.com> wrote:
> >
> > Commit da37845fdce2 ("packet: uses kfree_skb() for errors.") switches
> > from consume_skb to kfree_skb to improve error handling. However, this
> > could bring a lot of noises when we monitor real packet drops in
> > kfree_skb[1], because in tpacket_rcv or packet_rcv only packet clones
> > can be freed, not actual packets.
> >
> > Adding a generic drop reason to allow distinguish these "clone drops".
> >
> > [1]: https://lore.kernel.org/netdev/CABWYdi00L+O30Q=Zah28QwZ_5RU-xcxLFUK2Zj08A8MrLk9jzg@mail.gmail.com/
> > Fixes: da37845fdce2 ("packet: uses kfree_skb() for errors.")
> > Suggested-by: Eric Dumazet <edumazet@...gle.com>
> > Suggested-by: Willem de Bruijn <willemdebruijn.kernel@...il.com>
> > Signed-off-by: Yan Zhai <yan@...udflare.com>
> > ---
> 
> Reviewed-by: Eric Dumazet <edumazet@...gle.com>

Reviewed-by: Willem de Bruijn <willemb@...gle.com>