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if_vtnet: Add support for software LRO

Description

if_vtnet: Add support for software LRO

This useful when running on hosts that support checksum offloading
but not the GUEST_TSO (LRO) feature. Or potentially, some GRO-like
support when doing forwarding.

Only enable SW LRO when the host LRO is not available since both
tends to be harmful, and difficult to enable/disable selectively
with only a single IFCAP_LRO flag.

Reviewed by: grehan (mentor)
Differential Revision: https://reviews.freebsd.org/D27919

Details

Provenance
bryanvAuthored on Jan 19 2021, 4:55 AM
Reviewer
grehan
Differential Revision
D27919: if_vtnet: Initial support for software LRO
Parents
R10:177761e4c467: if_vtnet: Set the interface max TSO values
Branches
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Tags
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