netdev - Re: ICMP packets - ll_temac with Microblaze

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Message-ID: <1324463334.2728.20.camel@edumazet-HP-Compaq-6005-Pro-SFF-PC>
Date:	Wed, 21 Dec 2011 11:28:54 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	monstr@...str.eu
Cc:	David Miller <davem@...emloft.net>,
	John Williams <john.williams@...alogix.com>,
	netdev@...r.kernel.org
Subject: Re: ICMP packets - ll_temac with Microblaze

Le mercredi 21 décembre 2011 à 11:11 +0100, Michal Simek a écrit :
> Hi Eric and David,
> 
> I have found one problem with ll_temac driver and
> this commit: net: more accurate skb truesize
> sha1: 87fb4b7b533073eeeaed0b6bf7c2328995f6c075
> 
> The problem is only with icmp packets from the target. It is sent and driver receive it
> but it is not proceed to the application.
> 
> The problem I see is that kmalloc_node_track_caller allocate
> specific size and then this size is changed by SKB_WITH_OVERHEAD(ksize(data)).
> The problem is with netdev_alloc_skb_ip_align which calls __alloc_skb function.
> 
> Currently driver uses setting for jumbo frames (9k). When I change it to use mtu (1,5k) then
> everything is ok.
> 
> Can you give me some hints what can be wrong?
> 

Is it with SLUB, SLAB or SLOB allocator ?



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