netdev - Re: [RFC 2/6] net: add callback for setting a ubuf

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Date: Sat, 13 Apr 2024 11:18:25 -0600
From: David Ahern <dsahern@...nel.org>
To: Pavel Begunkov <asml.silence@...il.com>, io-uring@...r.kernel.org,
 netdev@...r.kernel.org
Cc: Jens Axboe <axboe@...nel.dk>, "David S . Miller" <davem@...emloft.net>,
 Jakub Kicinski <kuba@...nel.org>, Eric Dumazet <edumazet@...gle.com>,
 Willem de Bruijn <willemdebruijn.kernel@...il.com>
Subject: Re: [RFC 2/6] net: add callback for setting a ubuf_info to skb

On 4/12/24 6:55 AM, Pavel Begunkov wrote:
> At the moment an skb can only have one ubuf_info associated with it,
> which might be a performance problem for zerocopy sends in cases like
> TCP via io_uring. Add a callback for assigning ubuf_info to skb, this
> way we will implement smarter assignment later like linking ubuf_info
> together.
> 
> Note, it's an optional callback, which should be compatible with
> skb_zcopy_set(), that's because the net stack might potentially decide
> to clone an skb and take another reference to ubuf_info whenever it
> wishes. Also, a correct implementation should always be able to bind to
> an skb without prior ubuf_info, otherwise we could end up in a situation
> when the send would not be able to progress.
> 
> Signed-off-by: Pavel Begunkov <asml.silence@...il.com>
> ---
>  include/linux/skbuff.h |  2 ++
>  net/core/skbuff.c      | 20 ++++++++++++++------
>  2 files changed, 16 insertions(+), 6 deletions(-)
> 

Reviewed-by: David Ahern <dsahern@...nel.org>