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

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Message-ID: <CANn89iLww-JGAuyD4XFvpn1gy52hgHQwHE1o-UvHu6sU3-6ygw@mail.gmail.com>
Date:   Mon, 4 Dec 2023 21:01:00 +0100
From:   Eric Dumazet <edumazet@...gle.com>
To:     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

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>