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sfxge: avoid TSO packets collapses bacause of not 2K aligned data

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Sponsored by:   Solarflare Communications, Inc.
MFC after:      2 days
Differential Revision: https://reviews.freebsd.org/D4310
This commit is contained in:
arybchik 2015-11-30 13:27:40 +00:00
parent 8c1026b736
commit 2bc37ed56c
1 changed files with 5 additions and 3 deletions
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8
sys/dev/sfxge/sfxge_tx.h
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@ -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.