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From: "Bjoern A. Zeeb" <bz@FreeBSD.org>
Date: Mon, 23 Apr 2012 22:05:09 +0000 (UTC)
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Subject: svn commit: r234620 - head/sys/dev/ixgbe
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Author: bz
Date: Mon Apr 23 22:05:09 2012
New Revision: 234620
URL: http://svn.freebsd.org/changeset/base/234620

Log:
  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)
  MFC after:	1 week

Modified:
  head/sys/dev/ixgbe/ixgbe.h

Modified: head/sys/dev/ixgbe/ixgbe.h
==============================================================================
--- head/sys/dev/ixgbe/ixgbe.h	Mon Apr 23 22:03:56 2012	(r234619)
+++ head/sys/dev/ixgbe/ixgbe.h	Mon Apr 23 22:05:09 2012	(r234620)
@@ -179,7 +179,7 @@
 #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 IXGBE_VFTA_SIZE			128