hyperv/hn: Use channel0, i.e. TX ring0, for TCP SYN/SYN|ACK.

Hyper-V hot channel effect:
Operation latency on hot channel is only _half_ of the operation
latency on cold channels.

This commit takes

hyperv/hn: Use channel0, i.e. TX ring0, for TCP SYN/SYN|ACK.

Hyper-V hot channel effect:
Operation latency on hot channel is only _half_ of the operation
latency on cold channels.

This commit takes the advantage of the above Hyper-V host channel
effect, and can reduce more than 75% latency and more than 50%
latency stdev, i.e. lower and more stable/predictable latency,
for various types of web server workloads.

MFC after: 3 days
Sponsored by: Microsoft

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hyperv/hn: Fixat RNDIS rxfilter after the successful RNDIS init.

Under certain conditions on certain versions of Hyper-V, the RNDIS
rxfilter is _not_ zero on the hypervisor side after the successful

hyperv/hn: Fixat RNDIS rxfilter after the successful RNDIS init.

Under certain conditions on certain versions of Hyper-V, the RNDIS
rxfilter is _not_ zero on the hypervisor side after the successful
RNDIS initialization, which breaks the assumption of any following
code (well, it breaks the RNDIS API contract actually). Clear the
RNDIS rxfilter explicitly, drain packets sneaking through, and drain
the interrupt taskqueues scheduled due to the stealth packets.

Reported by: dexuan@
MFC after: 3 days
Sponsored by: Microsoft
Differential Revision: https://reviews.freebsd.org/D10230

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Merge ^/head r314482 through r314522.

hyperv/hn: Simplify RNDIS packet total length calculation.

MFC after: 1 week
Sponsored by: Microsoft
Differential Revision: https://reviews.freebsd.org/D9712

Merge ^/head r314270 through r314419.

hyperv/hn: Simplify RNDIS packet data offset calculation.

MFC after: 1 week
Sponsored by: Microsoft
Differential Revision: https://reviews.freebsd.org/D9699

MFhead@r313243

Merge ^/head r312624 through r312719.

hyperv/hn: add devctl_notify for VF_UP/DOWN events

Reviewed by: sephe
Approved by: sephe (mentor)
MFC after: 2 weeks
Sponsored by: Microsoft
Differential Revision: https://reviews.freebsd.org/D9102

hyperv/hn: add a sysctl name for the VF interface

This makes it easier for the userland script to find the releated
VF interface.

Reviewed by: sephe
Approved by: sephe (mentor)
MFC after: 2 weeks
S

hyperv/hn: add a sysctl name for the VF interface

This makes it easier for the userland script to find the releated
VF interface.

Reviewed by: sephe
Approved by: sephe (mentor)
MFC after: 2 weeks
Sponsored by: Microsoft
Differential Revision: https://reviews.freebsd.org/D9101

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hyperv/hn: add the support for VF drivers (SR-IOV)

Hyper-V's NIC SR-IOV implementation needs a Hyper-V synthetic NIC and
a VF NIC to work together (both NICs have the same MAC address), mainly to
su

hyperv/hn: add the support for VF drivers (SR-IOV)

Hyper-V's NIC SR-IOV implementation needs a Hyper-V synthetic NIC and
a VF NIC to work together (both NICs have the same MAC address), mainly to
support seamless live migration.

When the VF device becomes UP (or DOWN), the synthetic NIC driver needs
to switch the data path from the synthetic NIC to the VF (or the opposite).

Note: multicast/broadcast packets are still received through the synthetic
NIC and we need to inject the packets through the VF interface (if the VF is
UP), even if the synthetic NIC is DOWN (so we need to force the rxfilter
to be NDIS_PACKET_TYPE_PROMISCUOUS, when the VF is UP).

Reviewed by: sephe
Approved by: sephe (mentor)
MFC after: 2 weeks
Sponsored by: Microsoft
Differential Revision: https://reviews.freebsd.org/D8964

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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 che

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)
MFC after: 2 weeks
Sponsored by: Microsoft
Differential Revision: https://reviews.freebsd.org/D8962

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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)
MFC after: 2 weeks
Sponsored by: Micros

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)
MFC after: 2 weeks
Sponsored by: Microsoft
Differential Revision: https://reviews.freebsd.org/D8909

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hyperv/hn: Factor out function to set rxfilter.

MFC after: 1 week
Sponsored by: Microsoft
Differential Revision: https://reviews.freebsd.org/D8928

hyperv/hn: Function renaming; no functional changes.

MFC after: 1 week
Sponsored by: Microsoft
Differential Revision: https://reviews.freebsd.org/D8908

hyperv/hn: Consolidate hn_{suspend,resume}

MFC after: 1 week
Sponsored by: Microsoft
Differential Revision: https://reviews.freebsd.org/D8907

Merge ^/head r309817 through r310168.

hyperv/hn: Add polling support

MFC after: 1 week
Sponsored by: Microsoft
Differential Revision: https://reviews.freebsd.org/D8739

Merge ^/head r309263 through r309518.

hyperv/hn: Add 'options RSS' support.

Reviewed by: adrian
MFC after: 1 week
Sponsored by: Microsoft
Differential Revision: https://reviews.freebsd.org/D8676

hyperv/hn: Don't hold txdesc, if no BPFs are attached.

MFC after: 1 week
Sponsored by: Microsoft
Differential Revision: https://reviews.freebsd.org/D8675

hyperv/hn: Add HN_DEBUG kernel option.

If bufring is used for per-TX ring descs, don't update "available"
counter, which is only used to help debugging.

MFC after: 1 week
Sponsored by: Microsoft
Di

hyperv/hn: Add HN_DEBUG kernel option.

If bufring is used for per-TX ring descs, don't update "available"
counter, which is only used to help debugging.

MFC after: 1 week
Sponsored by: Microsoft
Differential Revision: https://reviews.freebsd.org/D8674

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hyperv/hn: Allow TX to share event taskqueues.

MFC after: 1 week
Sponsored by: Microsoft
Differential Revision: https://reviews.freebsd.org/D8659

hyperv/hn: Allow multiple TX taskqueues.

MFC after: 1 week
Sponsored by: Microsoft
Differential Revision: https://reviews.freebsd.org/D8655

hyperv/hn: Nuke the unused TX taskqueue CPU binding tunable.

It was an experimental tunable, and is now deemed to be road blocker
for further changes. Time to retire it.

MFC after: 1 week
Sponsore

hyperv/hn: Nuke the unused TX taskqueue CPU binding tunable.

It was an experimental tunable, and is now deemed to be road blocker
for further changes. Time to retire it.

MFC after: 1 week
Sponsored by: Microsoft
Differential Revision: https://reviews.freebsd.org/D8654

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