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Re: [PATCH v2 1/2] vdpa: rename vhost_vdpa_net_cvq_add()
From: |
Hawkins Jiawei |
Subject: |
Re: [PATCH v2 1/2] vdpa: rename vhost_vdpa_net_cvq_add() |
Date: |
Wed, 17 May 2023 23:11:42 +0800 |
Sorry for forgetting cc when replying to the email.
I will resend this email with cc.
On Wed, 17 May 2023 at 12:12, Jason Wang <jasowang@redhat.com> wrote:
>
> On Sat, May 6, 2023 at 10:07 PM Hawkins Jiawei <yin31149@gmail.com> wrote:
> >
> > We want to introduce a new version of vhost_vdpa_net_cvq_add() that
> > does not poll immediately after forwarding custom buffers
> > to the device, so that QEMU can send all the SVQ control commands
> > in parallel instead of serialized.
> >
> > Signed-off-by: Hawkins Jiawei <yin31149@gmail.com>
> > ---
> > net/vhost-vdpa.c | 15 +++++++++++----
> > 1 file changed, 11 insertions(+), 4 deletions(-)
> >
> > diff --git a/net/vhost-vdpa.c b/net/vhost-vdpa.c
> > index 99904a0da7..10804c7200 100644
> > --- a/net/vhost-vdpa.c
> > +++ b/net/vhost-vdpa.c
> > @@ -590,8 +590,14 @@ static void vhost_vdpa_net_cvq_stop(NetClientState *nc)
> > vhost_vdpa_net_client_stop(nc);
> > }
> >
> > -static ssize_t vhost_vdpa_net_cvq_add(VhostVDPAState *s, size_t out_len,
> > - size_t in_len)
> > +/**
> > + * vhost_vdpa_net_cvq_add_and_wait() adds SVQ control commands to SVQ,
> > + * kicks the device and polls the device used buffers.
> > + *
> > + * Return the length written by the device.
> > + */
> > +static ssize_t vhost_vdpa_net_cvq_add_and_wait(VhostVDPAState *s,
>
> Nit: is it better to use "poll" or "sync" other than wait?
>
> Other than this:
>
> Acked-by: Jason Wang <jasowang@redhat.com>
Hi Jason,
Thanks for your suggestion. I prefer 'poll', which makes it clearer
that this function will poll immediately compared to the new
version of vhost_vdpa_net_cvq_add().
I will refactor this in the v2 patch with the Acked-by tag on.
Thanks!
>
> Thanks
>
> > + size_t out_len, size_t in_len)
> > {
> > /* Buffers for the device */
> > const struct iovec out = {
> > @@ -636,7 +642,7 @@ static ssize_t vhost_vdpa_net_load_cmd(VhostVDPAState
> > *s, uint8_t class,
> > memcpy(s->cvq_cmd_out_buffer, &ctrl, sizeof(ctrl));
> > memcpy(s->cvq_cmd_out_buffer + sizeof(ctrl), data, data_size);
> >
> > - return vhost_vdpa_net_cvq_add(s, sizeof(ctrl) + data_size,
> > + return vhost_vdpa_net_cvq_add_and_wait(s, sizeof(ctrl) + data_size,
> > sizeof(virtio_net_ctrl_ack));
> > }
> >
> > @@ -753,7 +759,8 @@ static int
> > vhost_vdpa_net_handle_ctrl_avail(VhostShadowVirtqueue *svq,
> > dev_written = sizeof(status);
> > *s->status = VIRTIO_NET_OK;
> > } else {
> > - dev_written = vhost_vdpa_net_cvq_add(s, out.iov_len,
> > sizeof(status));
> > + dev_written = vhost_vdpa_net_cvq_add_and_wait(s, out.iov_len,
> > + sizeof(status));
> > if (unlikely(dev_written < 0)) {
> > goto out;
> > }
> > --
> > 2.25.1
> >
>
- [PATCH v2 2/2] vdpa: send CVQ state load commands in parallel, (continued)
- [PATCH v2 2/2] vdpa: send CVQ state load commands in parallel, Hawkins Jiawei, 2023/05/06
- Re: [PATCH v2 2/2] vdpa: send CVQ state load commands in parallel, Jason Wang, 2023/05/17
- Re: [PATCH v2 2/2] vdpa: send CVQ state load commands in parallel, Eugenio Perez Martin, 2023/05/17
- Re: [PATCH v2 2/2] vdpa: send CVQ state load commands in parallel, Hawkins Jiawei, 2023/05/17
- Re: [PATCH v2 2/2] vdpa: send CVQ state load commands in parallel, Jason Wang, 2023/05/18
- Re: [PATCH v2 2/2] vdpa: send CVQ state load commands in parallel, Eugenio Perez Martin, 2023/05/18
- Re: [PATCH v2 2/2] vdpa: send CVQ state load commands in parallel, Jason Wang, 2023/05/18
- Re: [PATCH v2 2/2] vdpa: send CVQ state load commands in parallel, Hawkins Jiawei, 2023/05/18
[PATCH v2 1/2] vdpa: rename vhost_vdpa_net_cvq_add(), Hawkins Jiawei, 2023/05/06