linux-kernel - Re: [RFC net-next v3 05/29] net: bvec specific path in zerocopy_sg_from

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Message-ID: <20220628225204.GA27554@u2004-local>
Date:   Tue, 28 Jun 2022 16:52:04 -0600
From:   David Ahern <dsahern@...nel.org>
To:     Pavel Begunkov <asml.silence@...il.com>
Cc:     io-uring@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Jonathan Lemon <jonathan.lemon@...il.com>,
        Willem de Bruijn <willemb@...gle.com>,
        Jens Axboe <axboe@...nel.dk>, kernel-team@...com
Subject: Re: [RFC net-next v3 05/29] net: bvec specific path in
 zerocopy_sg_from_iter

On Tue, Jun 28, 2022 at 07:56:27PM +0100, Pavel Begunkov wrote:
> Add an bvec specialised and optimised path in zerocopy_sg_from_iter.
> It'll be used later for {get,put}_page() optimisations.
> 
> Signed-off-by: Pavel Begunkov <asml.silence@...il.com>
> ---
>  net/core/datagram.c | 47 +++++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 47 insertions(+)
> 

Rather than propagating iter functions, I have been using the attached
patch for a few months now. It leverages your ubuf_info in msghdr to
allow in kernel users to pass in their own iter handler.

View attachment "0001-net-Allow-custom-iter-handler-in-uarg.patch" of type "text/x-diff" (6669 bytes)