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From: "Bjoern A. Zeeb" <bz@FreeBSD.org>
Date: Sat, 19 May 2012 22:17:35 +0000 (UTC)
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Subject: svn commit: r235667 - stable/7/sys/dev/ixgbe
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Author: bz
Date: Sat May 19 22:17:34 2012
New Revision: 235667
URL: http://svn.freebsd.org/changeset/base/235667

Log:
  MFC r234620:
  
   If we pass down 64k - L2 hdr size + 1 to 64K L3+ data adding an ether
   header will make the data go over the 64k limits announced to busdma as
   maxsize and the transaction will fail.
  
   With TSO this can result in a TCP regression due to the lost packet.
  
   According to the data sheets ixgbe(4) 82598 and 82599 can handle up to
   256k so increase the maximum.
  
   Reported by:	Jon Kåre Hellan, UNINETT (jon.kare.hellan uninett.no)
   Tested by:	Jon Kåre Hellan, UNINETT (jon.kare.hellan uninett.no)

Modified:
  stable/7/sys/dev/ixgbe/ixgbe.h
Directory Properties:
  stable/7/sys/   (props changed)

Modified: stable/7/sys/dev/ixgbe/ixgbe.h
==============================================================================
--- stable/7/sys/dev/ixgbe/ixgbe.h	Sat May 19 22:16:12 2012	(r235666)
+++ stable/7/sys/dev/ixgbe/ixgbe.h	Sat May 19 22:17:34 2012	(r235667)
@@ -168,7 +168,7 @@
 #define IXGBE_82599_SCATTER		32
 #define MSIX_82598_BAR			3
 #define MSIX_82599_BAR			4
-#define IXGBE_TSO_SIZE			65535
+#define IXGBE_TSO_SIZE			262140
 #define IXGBE_TX_BUFFER_SIZE		((u32) 1514)
 #define IXGBE_RX_HDR			128
 #define CSUM_OFFLOAD			7	/* Bits in csum flags */