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Date:      Wed, 21 Apr 2021 15:21:48 +0000
From:      bugzilla-noreply@freebsd.org
To:        bugs@FreeBSD.org
Subject:   [Bug 254343] 13.0-RC2: adding a vtnet (VirtIO network) interface to bridge fails
Message-ID:  <bug-254343-227-1ruxtpdv5O@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-254343-227@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=254343

Aleksandr Fedorov <afedorov@FreeBSD.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |afedorov@FreeBSD.org,
                   |                            |bryanv@FreeBSD.org,
                   |                            |grehan@FreeBSD.org,
                   |                            |kevans@freebsd.org
          Component|misc                        |kern

--- Comment #4 from Aleksandr Fedorov <afedorov@FreeBSD.org> ---
I think this is regression in if_vtnet(4).

12-STABLE
https://github.com/freebsd/freebsd-src/blob/stable/12/sys/dev/virtio/network/if_vtnet.c#L1103
:
                        if ((ifp->if_flags ^ sc->vtnet_if_flags) &
                            (IFF_PROMISC | IFF_ALLMULTI)) {
                                if (sc->vtnet_flags & VTNET_FLAG_CTRL_RX)
                                        vtnet_rx_filter(sc);
                                else {
                                        ifp->if_flags |= IFF_PROMISC;
                                        if ((ifp->if_flags ^
sc->vtnet_if_flags)
                                            & IFF_ALLMULTI)
                                                error = ENOTSUP;
                                }
                        }


RELENG 13.0
https://github.com/freebsd/freebsd-src/blob/releng/13.0/sys/dev/virtio/network/if_vtnet.c#L1297
:

        if ((ifp->if_flags ^ sc->vtnet_if_flags) &
            (IFF_PROMISC | IFF_ALLMULTI)) {
                if ((sc->vtnet_flags & VTNET_FLAG_CTRL_RX) == 0)
                        return (ENOTSUP);
                vtnet_rx_filter(sc);
        }

Therefore, if the hypervisor does not confirm support for VTNET_FLAG_CTRL_RX,
the latest driver version cannot enable PROMISC mode.

For example, bhyve doesn't support VTNET_FLAG_CTRL_RX.

Technically, if the hypervisor doesn't support the VTNET_FLAG_CTRL_RX, then the
interface is always in PROMISC mode.
I see no reason to prohibit switching the interface to PROMISC mode if
VTNET_FLAG_CTRL_RX is not supported by the hypervisor.

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