MFC: r312685, r312686

MFC: r312685, r312686

Approved by:	sephe (mentor)

r312685
    hyperv/hn: remember the channel pointer in struct hn_rx_ring

    This will be used by the coming NIC SR-IOV patch.

    Reviewed by:	sephe
    Approved by:	sephe (mentor)
    Sponsored by:	Microsoft
    Differential Revision:	https://reviews.freebsd.org/D8909

r312686
    hyperv/hn: remove the MTU and IFF_DRV_RUNNING checking in hn_rxpkt()

    It's unnecessary because the upper nework stack does the same checking.

    In the case of Hyper-V SR-IOV, we need to remove the checking because
    1) multicast/broadcast packets are still received through the synthetic
    NIC and we need to inject the packets through the VF interface;
    2) we must inject the packets even if the synthetic NIC is down, or has
    a different MTU from the VF device.

    Reviewed by:	sephe
    Approved by:	sephe (mentor)
    Sponsored by:	Microsoft
    Differential Revision:	https://reviews.freebsd.org/D8962

git-svn-id: svn://svn.freebsd.org/base/stable/10@314121 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f