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V 2
kp
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svn:date
V 27
2017-07-29T09:22:48.745292Z
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V 747
vtnet: Support jumbo frames without TSO/GSO

Currently in Virtio driver without TSO/GSO features enabled, the max scatter
gather segments for the TX path can be 4, which limits the support for 9K JUMBO
frames. 9K JUMBO frames results in more than 4 scatter gather segments and
virtio driver fails to send the frame down to host OS. With TSO/GSO feature
enabled max scatter gather segments can be 64, then 9K JUMBO frames are fine,
this is making virtio driver to support JUMBO frames only with TSO/GSO.

Increasing the VTNET_MIN_TX_SEGS which is the case for non TSO/GSO to 32 to
support upto 64K JUMBO frames to Host.

Submitted by:	Lohith Bellad <lohithbsd@gmail.com>
Reviewed by:	adrian
Differential Revision:	https://reviews.freebsd.org/D8803

END