netdev - Re: [PATCH 8/8] x25: use limited socket backlog

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Date:	Wed, 03 Mar 2010 08:08:29 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Zhu Yi <yi.zhu@...el.com>
Cc:	netdev@...r.kernel.org, Andrew Hendry <andrew.hendry@...il.com>
Subject: Re: [PATCH 8/8] x25: use limited socket backlog

Le mercredi 03 mars 2010 à 14:35 +0800, Zhu Yi a écrit :
> Make x25 adapt to the limited socket backlog change.
> 
> Cc: Andrew Hendry <andrew.hendry@...il.com>
> Signed-off-by: Zhu Yi <yi.zhu@...el.com>
> ---
>  net/x25/x25_dev.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/net/x25/x25_dev.c b/net/x25/x25_dev.c
> index 3e1efe5..5688123 100644
> --- a/net/x25/x25_dev.c
> +++ b/net/x25/x25_dev.c
> @@ -53,7 +53,7 @@ static int x25_receive_data(struct sk_buff *skb, struct x25_neigh *nb)
>  		if (!sock_owned_by_user(sk)) {
>  			queued = x25_process_rx_frame(sk, skb);
>  		} else {
> -			sk_add_backlog(sk, skb);
> +			__sk_add_backlog(sk, skb);
>  		}
>  		bh_unlock_sock(sk);
>  		sock_put(sk);

Please respin your patch the other way 

Ie: let sk_add_backlog(sk, skb) do its previous job (not leaking skbs,
and returning a void status)

Add a new function able to no limit backlog, and returns an error code,
so that caller can free skb and increment SNMP counters accordingly.

Callers MUST test return value, or use another helper that can free the
skb for them.

Name it sk_move_backlog() for example

This will permit you to split the work as you tried.

sk_add_backlog() could be redefined as the helper :

void sk_add_backlog(sk, skb)
{
	if (sk_move_backlog(sk, skb)) {
		kfree_skb(skb);
		atomic_inc(&sk->sk_drops);
	}
	
}

Thanks


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