netdev - Re: [PATCH v3 net-next] packet: add a generic drop reason for receive

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CANn89iJ-xLq8Ug1FqKn_Jp_VRXRdAB9mb3nhEjm4tDV251jeMw@mail.gmail.com>
Date: Sat, 2 Dec 2023 11:39:06 +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>, Weongyo Jeong <weongyo.linux@...il.com>, 
	linux-kernel@...r.kernel.org, kernel-team@...udflare.com, 
	Jesper Brouer <jesper@...udflare.com>
Subject: Re: [PATCH v3 net-next] packet: add a generic drop reason for receive

On Fri, Dec 1, 2023 at 7:32 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>
> Signed-off-by: Yan Zhai <yan@...udflare.com>
> ---

Reviewed-by: Eric Dumazet <edumazet@...gle.com>