Re: [PATCH io_uring-next/net-next v2 2/4] net: add callback for setting a ubuf_info to skb

[Willem de Bruijn <willemdebruijn.kernel@gmail.com>]

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.
> 
> Reviewed-by: Jens Axboe <axboe@kernel.dk>
> Reviewed-by: David Ahern <dsahern@kernel.org>
> Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>

Reviewed-by: Willem de Bruijn <willemb@google.com>