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sfxge: TxQ block level should use EFX_TXQ_LIMIT as maximum TxQ size

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Sponsored by:   Solarflare Communications, Inc.
Approved by:    gnn (mentor)
This commit is contained in:
Andrew Rybchenko 2015-02-22 07:20:04 +00:00
parent bce3678745
commit 4944888783
1 changed files with 13 additions and 7 deletions
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20
sys/dev/sfxge/sfxge_tx.c
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@ -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