if_vtnet - Factor out the virtio_bind_intr() calls into a separate function.

* And most importantly, store the bindings in the vtnet_softc struct, so we
can restore the interrupt <-> virtqueue bin

if_vtnet - Factor out the virtio_bind_intr() calls into a separate function.

* And most importantly, store the bindings in the vtnet_softc struct, so we
can restore the interrupt <-> virtqueue bindings when disabling polling
mode.

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vtnet - Split up serializers, now has separate rx and tx serializers.

* This uses the MULTI SERIALIZERS MODE in the DragonFly net framework.

* This allows the rx and tx paths of if_vtnet to run in

vtnet - Split up serializers, now has separate rx and tx serializers.

* This uses the MULTI SERIALIZERS MODE in the DragonFly net framework.

* This allows the rx and tx paths of if_vtnet to run in parallel.

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if_vtnet - Use ifsq_watchdog_* functions as the watchdog.

* The existing watchdog code was commented out.

if_vtnet - Remove vtnet_tick_ch and vtnet_cfgchg_task from softc struct.

* Forgot to remove the softc variables in the changes
c5f8e1538bcc13f7a39b805bcc5b774780 and 603be9646446bdb4292b6cd2754478

if_vtnet - Remove vtnet_tick_ch and vtnet_cfgchg_task from softc struct.

* Forgot to remove the softc variables in the changes
c5f8e1538bcc13f7a39b805bcc5b774780 and 603be9646446bdb4292b6cd27544788c2c.

* Also remove a leftover taskqueue_drain() call.

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virtio - Refactor virtio bus API, to untangle virtuques from IRQ allocation.

* These API changes allow each virtio device driver to explicitly control
the assignment of virtqueues to IRQ vectors.

virtio - Refactor virtio bus API, to untangle virtuques from IRQ allocation.

* These API changes allow each virtio device driver to explicitly control
the assignment of virtqueues to IRQ vectors.

* This allows explicitly assigning IRQ vectors to cpus. And virtio device
drivers also get to know, on which cpu each virtqueue interrupt is
running.

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if_vtnet - Handle missing IFCAP_VLAN_* flags nicer. Comment IFCAP_LOR stuff.

* The if_vtnet driver used to define the IFCAP_LRO, IFCAP_VLAN_HWFILTER and
IFCAP_VLAN_HWTSO flags itself, to make the

if_vtnet - Handle missing IFCAP_VLAN_* flags nicer. Comment IFCAP_LOR stuff.

* The if_vtnet driver used to define the IFCAP_LRO, IFCAP_VLAN_HWFILTER and
IFCAP_VLAN_HWTSO flags itself, to make the code from FreeBSD build.
Instead define IFCAP_VLAN_HWFILTER and IFCAP_VLAN_HWTSO to 0, when they
are not defined already. This allows the code to build, but all checks
for the flags fail. (Inspired by the vmxnet3 driver port).

* The IFCAP_LRO flag is unavailable in DragonFly, but the LRO offload seems
to work somehow.

* According to the virtio specification, LRO support should be possible
without rx checksum support as well.

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if_vtnet - Add back vtnet_tx_size variable for now, to fix build.

if_vtnet - Remove vtnet_{rx,tx}_size variables. Change rx_header padding.

* With a padding of 2 bytes, struct vtnet_rx_header will be 12 bytes now,
which should be correct to ensure the 4 byte ali

if_vtnet - Remove vtnet_{rx,tx}_size variables. Change rx_header padding.

* With a padding of 2 bytes, struct vtnet_rx_header will be 12 bytes now,
which should be correct to ensure the 4 byte alignment of the frame
payload, when mergeable Rx buffers are not negotiated.

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if_vtnet - Allocate struct vtnet_tx_header entries from a queue.

* The existing code was sequentially allocating from an array of
struct vtnet_tx_header, using an appropriately sized area.
But t

if_vtnet - Allocate struct vtnet_tx_header entries from a queue.

* The existing code was sequentially allocating from an array of
struct vtnet_tx_header, using an appropriately sized area.
But this scheme turns out to be a very bad idea when we get out-of-order
completions in the virtqueue.

* Instead allocate struct vtnet_tx_header entries from an SLIST.

* This should avoid crashes from memory-corruption or use-after-free in
if_vtnet(9), when running in KVM on Linux, using Linux's vhost-net
in-kernel virtqueue accelerator.

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if_vtnet: Add support for indirect buffers. Activate LRO by default again.

Taken-From: FreeBSD

if_vtnet, sync 8/x: Move structs and #define-s into if_vtnetvar.h

Taken-From: FreeBSD