netdev - Re: [E1000-devel] [next:akpm 16/587] drivers/net/ethernet/intel/igb/igb_main.c:6231:2: error: call to '__compiletime_assert_6235' declared with attribute error: BUILD_BUG_ON failed: SKB_WITH_OVERHEAD(IGB_RX_BUFSZ) < (NET_SKB_PAD + NET_IP_ALIGN + IGB_TS_HDR

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Date:	Wed, 20 Feb 2013 13:42:40 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Alexander Duyck <alexander.h.duyck@...el.com>
Cc:	"Allan, Bruce W" <bruce.w.allan@...el.com>,
	"e1000-devel@...ts.sourceforge.net" 
	<e1000-devel@...ts.sourceforge.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"Brandeburg, Jesse" <jesse.brandeburg@...el.com>,
	Daniel Santos <daniel.santos@...ox.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Wu, Fengguang" <fengguang.wu@...el.com>
Subject: Re: [E1000-devel] [next:akpm 16/587]
 drivers/net/ethernet/intel/igb/igb_main.c:6231:2: error: call to
 '__compiletime_assert_6235' declared with attribute error: BUILD_BUG_ON
 failed: SKB_WITH_OVERHEAD(IGB_RX_BUFSZ) < (NET_SKB_PAD + NET_IP_ALIGN +
 IGB_TS_HDR_LEN + ETH...

On Wed, 2013-02-20 at 13:23 -0800, Alexander Duyck wrote:

> NET_SKB_PAD is defined for the s390.  It is already 32.  If you look it
> up we only have 2 definitions for NET_SKB_PAD, one specific to the s390
> architecture and the other one in skbuff.h.
> 

Andrew traces disagree, as they were :

>>> s390 allmodconfig:
>>>
>>> bool __cond = !(!(((2048) - (((sizeof(struct skb_shared_info)) + (256 - 1)) &
>>> ~(256 - 1))) < (32 + 2 + 16 + 1514 + 4)));
>>>

So it might be only a cross-compile environment issue, I dont know.



> From what I can tell we would have to drop the NET_SKB_PAD to 0 in order
> to not trigger this error with igb since we still have to add 22 bytes
> for igb's per packet timestamp header, IP alignment, and CRC.
> 
> The simple fix is for us just to drop the BUILD_BUG_ON check for igb
> since we already had a check for size check in igb_set_rx_buffer_len. 
> It just means that build_skb won't be available for standard MTU sizes
> on s390.

Yeah, probably nobody will notice ;)



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