netdev - RE: [PATCH bpf-next] bpf, sockmap: Call skb_linearize only when required in sk_psock_skb_ingress

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Date:   Wed, 27 Apr 2022 14:59:41 -0700
From:   John Fastabend <john.fastabend@...il.com>
To:     Liu Jian <liujian56@...wei.com>, john.fastabend@...il.com,
        daniel@...earbox.net, jakub@...udflare.com, davem@...emloft.net,
        kuba@...nel.org, pabeni@...hat.com, ast@...nel.org,
        andrii@...nel.org, kafai@...com, songliubraving@...com, yhs@...com,
        kpsingh@...nel.org, netdev@...r.kernel.org, bpf@...r.kernel.org
Cc:     liujian56@...wei.com
Subject: RE: [PATCH bpf-next] bpf, sockmap: Call skb_linearize only when
 required in sk_psock_skb_ingress_enqueue

Liu Jian wrote:
> The skb_to_sgvec fails only when the number of frag_list and frags exceeds
> MAX_MSG_FRAGS. Therefore, we can call skb_linearize only when the
> conversion fails.
> 
> Signed-off-by: Liu Jian <liujian56@...wei.com>
> ---

Looks good.  I guess performance improvement for some use cases with lots of packets that
no longer need linearizing must be fairly good.

Acked-by: John Fastabend <john.fastabend@...il.com>