linux-kernel - Re: [BUG] net: core: netif_receive_skb_list() crash on non-standard ptypes forwarding

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Date:   Thu, 28 Mar 2019 11:37:00 +0000
From:   Edward Cree <ecree@...arflare.com>
To:     Alexander Lobakin <alobakin@...nk.ru>
CC:     "David S. Miller" <davem@...emloft.net>,
        Jiri Pirko <jiri@...lanox.com>,
        Ido Schimmel <idosch@...lanox.com>,
        Petr Machata <petrm@...lanox.com>,
        Alexander Duyck <alexander.h.duyck@...el.com>,
        Amritha Nambiar <amritha.nambiar@...el.com>,
        Li RongQing <lirongqing@...du.com>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [BUG] net: core: netif_receive_skb_list() crash on non-standard
 ptypes forwarding

On 28/03/2019 10:03, Alexander Lobakin wrote:
> Here's a working possible fix for that, not sure if it can break anything
> though.
>
> diff --git a/net/core/dev.c b/net/core/dev.c
> index 2b67f2aa59dd..fdcff29df915 100644
> --- a/net/core/dev.c
> +++ b/net/core/dev.c
> @@ -5014,8 +5014,10 @@ static inline void __netif_receive_skb_list_ptype(struct list_head *head,
>     if (pt_prev->list_func != NULL)
>         pt_prev->list_func(head, pt_prev, orig_dev);
>     else
> -        list_for_each_entry_safe(skb, next, head, list)
> +        list_for_each_entry_safe(skb, next, head, list) {
> +            skb_list_del_init(skb);
>             pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
> +        }
> }
>
> static void __netif_receive_skb_list_core(struct list_head *head, bool pfmemalloc)
>
> Maybe you could look into this and find another/better solution (or I could
> submit this one if that's pretty enough).
That looks like the correct fix to me, go ahead and have a
Reviewed-by: Edward Cree <ecree@...arflare.com>

>
> BTW, great work with netif_receive_skb_list() -- I've got 70 Mbps gain (~15%)
> on my setup in comparsion to napi_gro_receive().
Nice!

-Ed