linux-kernel - Re: [PATCH net-next 1/9] net: skb: introduce try_kfree

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Message-ID: <CANn89iK60VLmy3Y_7TZC-pXMZCho=W=uKPV2uf2tUmLdzJ1oFg@mail.gmail.com>
Date:   Sat, 29 Oct 2022 08:30:11 -0700
From:   Eric Dumazet <edumazet@...gle.com>
To:     menglong8.dong@...il.com
Cc:     kuba@...nel.org, davem@...emloft.net, pabeni@...hat.com,
        yoshfuji@...ux-ipv6.org, dsahern@...nel.org, imagedong@...cent.com,
        kafai@...com, asml.silence@...il.com, keescook@...omium.org,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH net-next 1/9] net: skb: introduce try_kfree_skb()

On Sat, Oct 29, 2022 at 6:11 AM <menglong8.dong@...il.com> wrote:
>
> From: Menglong Dong <imagedong@...cent.com>
>
> In order to simply the code, introduce try_kfree_skb(), which allow
> SKB_NOT_DROPPED_YET to be passed. When the reason is SKB_NOT_DROPPED_YET,
> consume_skb() will be called to free the skb normally. Otherwise,
> kfree_skb_reason() will be called.
>
> Signed-off-by: Menglong Dong <imagedong@...cent.com>
> ---
>  include/linux/skbuff.h | 9 +++++++++
>  1 file changed, 9 insertions(+)
>
> diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
> index 59c9fd55699d..f722accc054e 100644
> --- a/include/linux/skbuff.h
> +++ b/include/linux/skbuff.h
> @@ -1236,6 +1236,15 @@ static inline void consume_skb(struct sk_buff *skb)
>  }
>  #endif
>
> +static inline void try_kfree_skb(struct sk_buff *skb,
> +                                enum skb_drop_reason reason)
> +{
> +       if (reason != SKB_NOT_DROPPED_YET)
> +               kfree_skb_reason(skb, reason);
> +       else
> +               consume_skb(skb);
> +}
> +

My proposal looks better IMO

https://patchwork.kernel.org/project/netdevbpf/patch/20221028133043.2312984-2-edumazet@google.com/