MFC 306936-306939

MFC 306936-306939

306936
    hyperv/hn: Fix checksum offload settings

    The _correct_ way to identify the supported checksum offloading and
    TSO parameters is to query OID_TCP_OFFLOAD_HARDWARE_CAPABILITIES.

    Sponsored by:   Microsoft
    Differential Revision:  https://reviews.freebsd.org/D8088

306937
    hyperv/hn: Fix if_hw_tsomax setup.

    Sponsored by:   Microsoft
    Differential Revision:  https://reviews.freebsd.org/D8089

306938
    hyperv/hn: Generalize RSS capabilities query.

    - Support NDIS < 6.30.
    - Stringent response checks.

    Sponsored by:   Microsoft
    Differential Revision:  https://reviews.freebsd.org/D8090

306939
    hyperv/hn: Suffix NDIS offload size with NDIS version.

    Sponsored by:   Microsoft
    Differential Revision:  https://reviews.freebsd.org/D8091

git-svn-id: svn://svn.freebsd.org/base/stable/10@307620 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f