svn commit: r291488 - head/sys/dev/sfxge
Andrew Rybchenko
arybchik at FreeBSD.org
Mon Nov 30 13:27:42 UTC 2015
Author: arybchik
Date: Mon Nov 30 13:27:40 2015
New Revision: 291488
URL: https://svnweb.freebsd.org/changeset/base/291488
Log:
sfxge: avoid TSO packets collapses bacause of not 2K aligned data
Sponsored by: Solarflare Communications, Inc.
MFC after: 2 days
Differential Revision: https://reviews.freebsd.org/D4310
Modified:
head/sys/dev/sfxge/sfxge_tx.h
Modified: head/sys/dev/sfxge/sfxge_tx.h
==============================================================================
--- head/sys/dev/sfxge/sfxge_tx.h Mon Nov 30 13:20:49 2015 (r291487)
+++ head/sys/dev/sfxge/sfxge_tx.h Mon Nov 30 13:27:40 2015 (r291488)
@@ -51,11 +51,13 @@
/* Maximum number of DMA segments needed to map an mbuf chain. With
* TSO, the mbuf length may be just over 64K, divided into 2K mbuf
- * clusters. (The chain could be longer than this initially, but can
- * be shortened with m_collapse().)
+ * clusters taking into account that the first may be not 2K cluster
+ * boundary aligned.
+ * The chain could be longer than this initially, but can be shortened
+ * with m_collapse().
*/
#define SFXGE_TX_MAPPING_MAX_SEG \
- (1 + howmany(SFXGE_TSO_MAX_SIZE, MCLBYTES))
+ (1 + howmany(SFXGE_TSO_MAX_SIZE, MCLBYTES) + 1)
/*
* Buffer mapping flags.
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