On 7/10/2023 5:25 PM, Xuan Zhuo wrote:

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On Mon, 10 Jul 2023 12:20:01 +0300, Gavin Li [off-list ref] wrote:

As far as I know, Heng Qi does that. I'm not sure, it's the same piece.

cc @Heng Qi

Thanks.

Do you mean the one below?

https://lists.oasis-open.org/archives/virtio-dev/202303/msg00415.html

The code is to implement what it described and I don't have better 
words. So, I copied the text from Heng Qi's.

quoted

Currently, coalescing parameters are grouped for all transmit and receive
virtqueues. This patch series add support to set or get the parameters for
a specified virtqueue.

When the traffic between virtqueues is unbalanced, for example, one virtqueue
is busy and another virtqueue is idle, then it will be very useful to
control coalescing parameters at the virtqueue granularity.

Example command:
$ ethtool -Q eth5 queue_mask 0x1 --coalesce tx-packets 10
Would set max_packets=10 to VQ 1.
$ ethtool -Q eth5 queue_mask 0x1 --coalesce rx-packets 10
Would set max_packets=10 to VQ 0.
$ ethtool -Q eth5 queue_mask 0x1 --show-coalesce
  Queue: 0
  Adaptive RX: off  TX: off
  stats-block-usecs: 0
  sample-interval: 0
  pkt-rate-low: 0
  pkt-rate-high: 0

  rx-usecs: 222
  rx-frames: 0
  rx-usecs-irq: 0
  rx-frames-irq: 256

  tx-usecs: 222
  tx-frames: 0
  tx-usecs-irq: 0
  tx-frames-irq: 256

  rx-usecs-low: 0
  rx-frame-low: 0
  tx-usecs-low: 0
  tx-frame-low: 0

  rx-usecs-high: 0
  rx-frame-high: 0
  tx-usecs-high: 0
  tx-frame-high: 0

In this patch series:
Patch-1: Extract interrupt coalescing settings to a structure.
Patch-2: Extract get/set interrupt coalesce to a function.
Patch-3: Support per queue interrupt coalesce command.
Patch-4: Enable per queue interrupt coalesce feature.

Gavin Li (4):
   virtio_net: extract interrupt coalescing settings to a structure
   virtio_net: extract get/set interrupt coalesce to a function
   virtio_net: support per queue interrupt coalesce command
   virtio_net: enable per queue interrupt coalesce feature

  drivers/net/virtio_net.c        | 169 ++++++++++++++++++++++++++------
  include/uapi/linux/virtio_net.h |  14 +++
  2 files changed, 154 insertions(+), 29 deletions(-)

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2.39.1