netdev - RE: Atheros Communications Inc. AR8121/AR8113/AR8114 Gigabit or Fast Ethernet (rev b0) 1.0.0.7 md5/sha1 corrupted using NFS and samba (updated) Version 2

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Date:	Sun, 24 Mar 2013 10:22:48 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	"Huang, Xiong" <xiong@....qualcomm.com>
Cc:	Hannes Frederic Sowa <hannes@...essinduktion.org>,
	Sven Hartge <sven@...nhartge.de>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: RE: Atheros Communications Inc. AR8121/AR8113/AR8114 Gigabit or
 Fast Ethernet (rev b0) 1.0.0.7 md5/sha1 corrupted using NFS and samba
 (updated) Version 2

On Sun, 2013-03-24 at 05:42 +0000, Huang, Xiong wrote:

> 1.  pages cross 4GB bouandary ?  or overlap with each other ?

Normally this should not happen.

However the frame could span two 4K pages.

(physically contigous, and not spanning a 32K boundary)

> 2. try to set hw->dmaw_block = atl1e_dma_req_128 
> 3. can you print reg15C0 content when the NIC is in normal tx/rx status ?
> 4. other possible may be related the diff register configuration, but it's very difficult to compare with Windows driver :(  
> 

What could be tried is to remove the possibility of page spanning.

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 441f5bf..d0f4dd1 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -1849,7 +1849,7 @@ static inline void __skb_queue_purge(struct sk_buff_head *list)
 		kfree_skb(skb);
 }
 
-#define NETDEV_FRAG_PAGE_MAX_ORDER get_order(32768)
+#define NETDEV_FRAG_PAGE_MAX_ORDER 0
 #define NETDEV_FRAG_PAGE_MAX_SIZE  (PAGE_SIZE << NETDEV_FRAG_PAGE_MAX_ORDER)
 #define NETDEV_PAGECNT_MAX_BIAS	   NETDEV_FRAG_PAGE_MAX_SIZE
 


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