svn commit: r221077 - head/sys/dev/usb/net

[Hans Petter Selasky]

Author: hselasky
Date: Tue Apr 26 19:40:37 2011
New Revision: 221077
URL: http://svn.freebsd.org/changeset/base/221077

Log:
  The maximum NCM frame size must be so that it
  will generate a short terminated USB transfer if
  the maximum NCM frame size is greater than what
  the driver can handle.
  
  Reported by:	Matthias Benesch
  MFC after:	7 days
  Approved by:	thompsa (mentor)

Modified:
  head/sys/dev/usb/net/if_cdcereg.h

Modified: head/sys/dev/usb/net/if_cdcereg.h
==============================================================================
--- head/sys/dev/usb/net/if_cdcereg.h	Tue Apr 26 19:38:30 2011	(r221076)
+++ head/sys/dev/usb/net/if_cdcereg.h	Tue Apr 26 19:40:37 2011	(r221077)
@@ -39,7 +39,7 @@
 #define	CDCE_IND_SIZE_MAX 32            /* bytes */
 
 #define	CDCE_NCM_TX_MINLEN 512		/* bytes, must be power of two */
-#define	CDCE_NCM_TX_MAXLEN (1UL << 14)	/* bytes */
+#define	CDCE_NCM_TX_MAXLEN (16384 + 4)	/* bytes, must be short terminated */
 #define	CDCE_NCM_TX_FRAMES_MAX 8	/* units */
 
 #define	CDCE_NCM_RX_MAXLEN (1UL << 14)	/* bytes */