svn commit: r235667 - stable/7/sys/dev/ixgbe

Bjoern A. Zeeb bz at
Sat May 19 22:17:36 UTC 2012

Author: bz
Date: Sat May 19 22:17:34 2012
New Revision: 235667

  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
   Tested by:	Jon Kåre Hellan, UNINETT (jon.kare.hellan

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 */

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