linux-kernel - Re: [PATCH net-next 2/7] net: skb: introduce the function kfree_skb_list

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Date:   Thu, 3 Mar 2022 16:12:05 -0800
From:   Dongli Zhang <dongli.zhang@...cle.com>
To:     menglong8.dong@...il.com, dsahern@...nel.org, kuba@...nel.org
Cc:     rostedt@...dmis.org, mingo@...hat.com, davem@...emloft.net,
        ast@...nel.org, daniel@...earbox.net, hawk@...nel.org,
        john.fastabend@...il.com, imagedong@...cent.com,
        edumazet@...gle.com, talalahmad@...gle.com, keescook@...omium.org,
        ilias.apalodimas@...aro.org, alobakin@...me,
        flyingpeng@...cent.com, mengensun@...cent.com, atenart@...nel.org,
        bigeasy@...utronix.de, memxor@...il.com, arnd@...db.de,
        pabeni@...hat.com, willemb@...gle.com, vvs@...tuozzo.com,
        cong.wang@...edance.com, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, bpf@...r.kernel.org
Subject: Re: [PATCH net-next 2/7] net: skb: introduce the function
 kfree_skb_list_reason()

Hi Menglong,

I am going to send another v5 soon which introduces kfree_skb_list_reason() as well.

https://lore.kernel.org/all/20220226084929.6417-2-dongli.zhang@oracle.com/

I will need to make it inline as suggested by Jakub.

Not sure how to handle such scenario :)

Thank you very much!

Dongli Zhang

On 3/3/22 9:47 AM, menglong8.dong@...il.com wrote:
> From: Menglong Dong <imagedong@...cent.com>
> 
> To report reasons of skb drops, introduce the function
> kfree_skb_list_reason() and make kfree_skb_list() an inline call to
> it. This function will be used in the next commit in
> __dev_xmit_skb().
> 
> Signed-off-by: Menglong Dong <imagedong@...cent.com>
> ---
>  include/linux/skbuff.h | 8 +++++++-
>  net/core/skbuff.c      | 7 ++++---
>  2 files changed, 11 insertions(+), 4 deletions(-)
> 
> diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
> index ebd18850b63e..e344603aecc4 100644
> --- a/include/linux/skbuff.h
> +++ b/include/linux/skbuff.h
> @@ -1194,10 +1194,16 @@ static inline void kfree_skb(struct sk_buff *skb)
>  }
>  
>  void skb_release_head_state(struct sk_buff *skb);
> -void kfree_skb_list(struct sk_buff *segs);
> +void kfree_skb_list_reason(struct sk_buff *segs,
> +			   enum skb_drop_reason reason);
>  void skb_dump(const char *level, const struct sk_buff *skb, bool full_pkt);
>  void skb_tx_error(struct sk_buff *skb);
>  
> +static inline void kfree_skb_list(struct sk_buff *segs)
> +{
> +	kfree_skb_list_reason(segs, SKB_DROP_REASON_NOT_SPECIFIED);
> +}
> +
>  #ifdef CONFIG_TRACEPOINTS
>  void consume_skb(struct sk_buff *skb);
>  #else
> diff --git a/net/core/skbuff.c b/net/core/skbuff.c
> index b32c5d782fe1..46d7dea78011 100644
> --- a/net/core/skbuff.c
> +++ b/net/core/skbuff.c
> @@ -777,16 +777,17 @@ void kfree_skb_reason(struct sk_buff *skb, enum skb_drop_reason reason)
>  }
>  EXPORT_SYMBOL(kfree_skb_reason);
>  
> -void kfree_skb_list(struct sk_buff *segs)
> +void kfree_skb_list_reason(struct sk_buff *segs,
> +			   enum skb_drop_reason reason)
>  {
>  	while (segs) {
>  		struct sk_buff *next = segs->next;
>  
> -		kfree_skb(segs);
> +		kfree_skb_reason(segs, reason);
>  		segs = next;
>  	}
>  }
> -EXPORT_SYMBOL(kfree_skb_list);
> +EXPORT_SYMBOL(kfree_skb_list_reason);
>  
>  /* Dump skb information and contents.
>   *
>