svn commit: r227547 - head/sys/dev/qlxgb

[Bjoern A. Zeeb]

Author: bz
Date: Wed Nov 16 02:00:55 2011
New Revision: 227547
URL: http://svn.freebsd.org/changeset/base/227547

Log:
  The maximum TSO frame size should be:
  	maximum IP datagram size (65535 bytes) +
  	Ethernet header size (14 bytes) +
  	2 * VLAN tag size (4 bytes) [1].
  
  [1] We need to multiply by 2 to account for the double VLAN tag
      provision added in IEEE 802.1ad.
  
  Submitted by:	David Somayajulu (david.somayajulu qlogic.com)
  MFC after:	4 days

Modified:
  head/sys/dev/qlxgb/qla_def.h

Modified: head/sys/dev/qlxgb/qla_def.h
==============================================================================
--- head/sys/dev/qlxgb/qla_def.h	Wed Nov 16 02:00:27 2011	(r227546)
+++ head/sys/dev/qlxgb/qla_def.h	Wed Nov 16 02:00:55 2011	(r227547)
@@ -86,7 +86,7 @@ typedef struct qla_tx_buf qla_tx_buf_t;
 #define QLA_MAX_SEGMENTS	63	/* maximum # of segs in a sg list */
 #define QLA_MAX_FRAME_SIZE	MJUM9BYTES
 #define QLA_STD_FRAME_SIZE	1514
-#define QLA_MAX_TSO_FRAME_SIZE	(64 * 1024 - 1)
+#define QLA_MAX_TSO_FRAME_SIZE	((64 * 1024 - 1) + 22)
 
 /* Number of MSIX/MSI Vectors required */
 #define Q8_MSI_COUNT		4