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sephe
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V 27
2017-09-27T05:44:50.177634Z
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V 482
hyperv/hn: Fix UDP checksum offload issue in Azure.

UDP checksum offload does not work in Azure if following conditions are
met:
- sizeof(IP hdr + UDP hdr + payload) > 1420.
- IP_DF is not set in IP hdr

Use software checksum for UDP datagrams falling into this category.

Add two tunables to disable UDP/IPv4 and UDP/IPv6 checksum offload, in
case something unexpected happened.

MFC after:	1 week
Sponsored by:	Microsoft
Differential Revision:	https://reviews.freebsd.org/D12429

END