netdev - Re: skb_try_coalesce bug?

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Message-ID: <5357F0B4.5040606@ericsson.com>
Date:	Wed, 23 Apr 2014 12:56:20 -0400
From:	Jon Maloy <jon.maloy@...csson.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	Erik Hugne <erik.hugne@...csson.com>, <netdev@...r.kernel.org>
Subject: Re: skb_try_coalesce bug?

On 04/22/2014 05:37 PM, Eric Dumazet wrote:
> On Tue, 2014-04-22 at 14:29 -0700, Eric Dumazet wrote:
> 
>> Then if you do that, you also need to change head->data_len !
> 
> Untested patch would be :
> 
> diff --git a/net/tipc/link.c b/net/tipc/link.c
> index c5190ab75290..85077dd7c63e 100644
> --- a/net/tipc/link.c
> +++ b/net/tipc/link.c
> @@ -2349,6 +2349,7 @@ int tipc_link_frag_rcv(struct sk_buff **head, struct sk_buff **tail,
>  			(*tail)->next = frag;
>  		*tail = frag;
>  		(*head)->truesize += frag->truesize;
> +		(*head)->data_len += frag->len;

Just to confirm, does this mean that head's own (linear) data is not
included in data_len? 

///jon

>  	}
>  	if (fragid == LAST_FRAGMENT) {
>  		*fbuf = *head;
> 
> 

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