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sfxge: avoid TSO packets collapses if packet header uses 2 segments

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It is really observed in the case of VLAN over sfxge interface.
Also this change makes total value equal to 35 which is default assumed
by the kernel for if_hw_tsomaxsegcount.

Sponsored by:   Solarflare Communications, Inc.
MFC after:      2 days
Differential Revision: https://reviews.freebsd.org/D4319
This commit is contained in:
Andrew Rybchenko 2015-12-01 06:23:15 +00:00
parent 0574118ff7
commit 120584dca6
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=291569
1 changed files with 3 additions and 1 deletions
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4
sys/dev/sfxge/sfxge_tx.h
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@ -53,11 +53,13 @@
* TSO, the mbuf length may be just over 64K, divided into 2K mbuf
* clusters taking into account that the first may be not 2K cluster
* boundary aligned.
* Packet header may be split into two segments because of, for example,
* VLAN header insertion.
* 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)
(2 + howmany(SFXGE_TSO_MAX_SIZE, MCLBYTES) + 1)
/*
* Buffer mapping flags.