linux-kernel - Re: [RFC PATCH v3 09/12] net: add support for skbs with unreadable frags

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Message-ID: <c9a08db6-7418-4684-a5bf-6e9ac0655795@kernel.org>
Date:   Mon, 6 Nov 2023 18:09:05 -0700
From:   David Ahern <dsahern@...nel.org>
To:     Mina Almasry <almasrymina@...gle.com>,
        Willem de Bruijn <willemdebruijn.kernel@...il.com>
Cc:     Stanislav Fomichev <sdf@...gle.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
        linux-kselftest@...r.kernel.org, linux-media@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, linaro-mm-sig@...ts.linaro.org,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        Ilias Apalodimas <ilias.apalodimas@...aro.org>,
        Arnd Bergmann <arnd@...db.de>, Shuah Khan <shuah@...nel.org>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Christian König <christian.koenig@....com>,
        Shakeel Butt <shakeelb@...gle.com>,
        Jeroen de Borst <jeroendb@...gle.com>,
        Praveen Kaligineedi <pkaligineedi@...gle.com>,
        Willem de Bruijn <willemb@...gle.com>,
        Kaiyuan Zhang <kaiyuanz@...gle.com>
Subject: Re: [RFC PATCH v3 09/12] net: add support for skbs with unreadable
 frags

On 11/6/23 5:20 PM, Mina Almasry wrote:
> The user is free to modify or delete flow steering rules outside of the
> lifetime of the socket. Technically it's possible for the user to
> reconfigure flow steering while the socket is simultaneously receiving,
> and the result will be packets switching from devmem to non-devmem.

generically, from one page pool to another (ie., devmem piece of that
statement is not relevant).