From: Heng Qi <hengqi@linux.alibaba.com>
To: Jason Wang <jasowang@redhat.com>
Cc: netdev@vger.kernel.org,
virtualization@lists.linux-foundation.org,
"Michael S . Tsirkin" <mst@redhat.com>,
"David S . Miller" <davem@davemloft.net>,
Eric Dumazet <edumazet@google.com>,
Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>,
Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Jesper Dangaard Brouer <hawk@kernel.org>,
John Fastabend <john.fastabend@gmail.com>,
Xuan Zhuo <xuanzhuo@linux.alibaba.com>,
Gavin Li <gavinl@nvidia.com>
Subject: Re: [PATCH net 5/6] virtio-net: fix the vq coalescing setting for vq resize
Date: Fri, 22 Sep 2023 13:02:42 +0800 [thread overview]
Message-ID: <c95274cd-d119-402b-baf1-0c500472c9fb@linux.alibaba.com> (raw)
In-Reply-To: <CACGkMEuJjxAmr6WC9ETYAw2K9dp0AUoD6LSZCduQyUQ9y7oM3Q@mail.gmail.com>
在 2023/9/22 下午12:29, Jason Wang 写道:
> On Tue, Sep 19, 2023 at 3:49 PM Heng Qi <hengqi@linux.alibaba.com> wrote:
>> According to the definition of virtqueue coalescing spec[1]:
>>
>> Upon disabling and re-enabling a transmit virtqueue, the device MUST set
>> the coalescing parameters of the virtqueue to those configured through the
>> VIRTIO_NET_CTRL_NOTF_COAL_TX_SET command, or, if the driver did not set
>> any TX coalescing parameters, to 0.
>>
>> Upon disabling and re-enabling a receive virtqueue, the device MUST set
>> the coalescing parameters of the virtqueue to those configured through the
>> VIRTIO_NET_CTRL_NOTF_COAL_RX_SET command, or, if the driver did not set
>> any RX coalescing parameters, to 0.
>>
>> We need to add this setting for vq resize (ethtool -G) where vq_reset happens.
>>
>> [1] https://lists.oasis-open.org/archives/virtio-dev/202303/msg00415.html
>>
>> Fixes: 394bd87764b6 ("virtio_net: support per queue interrupt coalesce command")
> I'm not sure this is a real fix as spec allows it to go zero?
The spec says that if the user has configured interrupt coalescing
parameters,
parameters need to be restored after vq_reset, otherwise set to 0.
vi->intr_coal_tx and vi->intr_coal_rx always save the newest global
parameters,
regardless of whether the command is sent or not. So I think we need
this patch
it complies with the specification requirements.
Thanks!
>
> Thanks
next prev parent reply other threads:[~2023-09-22 5:02 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-09-19 7:49 [PATCH net 0/6] virtio-net: Fix and update interrupt moderation Heng Qi
2023-09-19 7:49 ` [PATCH net 1/6] virtio-net: initially change the value of tx-frames Heng Qi
2023-09-21 7:03 ` Jason Wang
2023-09-19 7:49 ` [PATCH net 2/6] virtio-net: fix mismatch of getting tx-frames Heng Qi
2023-09-22 3:11 ` Jason Wang
2023-09-19 7:49 ` [PATCH net 3/6] virtio-net: consistently save parameters for per-queue Heng Qi
2023-09-22 4:26 ` Jason Wang
2023-09-19 7:49 ` [PATCH net 4/6] virtio-net: fix per queue coalescing parameter setting Heng Qi
2023-09-22 4:27 ` Jason Wang
2023-09-19 7:49 ` [PATCH net 5/6] virtio-net: fix the vq coalescing setting for vq resize Heng Qi
2023-09-22 4:29 ` Jason Wang
2023-09-22 5:02 ` Heng Qi [this message]
2023-09-22 7:32 ` Jason Wang
2023-09-22 7:58 ` Heng Qi
2023-09-25 2:29 ` Jason Wang
2023-09-25 2:47 ` Heng Qi
2023-09-22 9:50 ` Xuan Zhuo
2023-09-25 2:29 ` Jason Wang
2023-09-25 2:45 ` Heng Qi
2023-09-19 7:49 ` [PATCH net 6/6] virtio-net: a tiny comment update Heng Qi
2023-09-22 4:30 ` Jason Wang
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