shurd f81cb8df32 Some small packet performance improvements
If the packet is smaller than MTU, disable the TSO flags.
Move TCP header parsing inside the IS_TSO?() test.
Add a new IFLIB_NEED_ZERO_CSUM flag to indicate the checksums need to be zeroed before TX.

Reviewed by:	sbruno
Approved by:	sbruno (mentor)
Sponsored by:	Limelight Networks
Differential Revision:	https://reviews.freebsd.org/D12442
2017-09-23 01:33:20 +00:00
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