netdev - Re: [PATCH net-next 3/3] net: create and use NAPI version of tc_skb_ext

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: <20230215093505.4b27c8ea@kernel.org>
Date:   Wed, 15 Feb 2023 09:35:05 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Jamal Hadi Salim <jhs@...atatu.com>
Cc:     davem@...emloft.net, netdev@...r.kernel.org, edumazet@...gle.com,
        pabeni@...hat.com, willemb@...gle.com, fw@...len.de,
        saeedm@...dia.com, leon@...nel.org, xiyou.wangcong@...il.com,
        jiri@...nulli.us, roid@...dia.com, ozsh@...dia.com,
        paulb@...dia.com
Subject: Re: [PATCH net-next 3/3] net: create and use NAPI version of
 tc_skb_ext_alloc()

On Wed, 15 Feb 2023 11:50:55 -0500 Jamal Hadi Salim wrote:
> Dumb question: Would this work with a consumer of the metadata past
> RPS stage? didnt look closely but assumed per cpu skb_ext because of
> the napi context - which will require a per cpu pointer to fetch it
> later.

The cache is just for allocation, specifically for the case where
driver allocates the skb and it's quickly coalesced by GRO.
The lifetime of the allocated object is not changed.