Author: arybchik
Date: Sun Feb 22 07:20:04 2015
New Revision: 279147
URL: https://svnweb.freebsd.org/changeset/base/279147
Log:
sfxge: TxQ block level should use EFX_TXQ_LIMIT as maximum TxQ size
Sponsored by: Solarflare Communications, Inc.
Approved by: gnn (mentor)
Modified:
head/sys/dev/sfxge/sfxge_tx.c
Modified: head/sys/dev/sfxge/sfxge_tx.c
==============================================================================
--- head/sys/dev/sfxge/sfxge_tx.c Sun Feb 22 07:18:38 2015
(r279146)
+++ head/sys/dev/sfxge/sfxge_tx.c Sun Feb 22 07:20:04 2015
(r279147)
@@ -67,16 +67,22 @@ __FBSDID("$FreeBSD$");
#include "sfxge.h"
#include "sfxge_tx.h"
-/* Set the block level to ensure there is space to generate a
- * large number of descriptors for TSO. With minimum MSS and
- * maximum mbuf length we might need more than a ring-ful of
- * descriptors, but this should not happen in practice except
- * due to deliberate attack. In that case we will truncate
- * the output at a packet boundary.
+/*
+ * Estimate maximum number of Tx descriptors required for TSO packet.
+ * With minimum MSS and maximum mbuf length we might need more (even
+ * than a ring-ful of descriptors), but this should not happen in
+ * practice except due to deliberate attack. In that case we will
+ * truncate the output at a packet boundary.
*/
#define SFXGE_TSO_MAX_DESC
\
(SFXGE_TSO_MAX_SEGS * 2 + SFXGE_TX_MAPPING_MAX_SEG - 1)
-#define SFXGE_TXQ_BLOCK_LEVEL(_entries) ((_entries) -
SFXGE_TSO_MAX_DESC)
+
+/*
+ * Set the block level to ensure there is space to generate a
+ * large number of descriptors for TSO.
+ */
+#define SFXGE_TXQ_BLOCK_LEVEL(_entries)
\
+ (EFX_TXQ_LIMIT(_entries) - SFXGE_TSO_MAX_DESC)
#ifdef SFXGE_HAVE_MQ
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