netdev - Re: [PATCH net v2 5/6] virtio-net: fix the vq coalescing setting for vq resize

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Date: Sun, 8 Oct 2023 13:21:05 +0800
From: Jason Wang <jasowang@...hat.com>
To: Heng Qi <hengqi@...ux.alibaba.com>
Cc: Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org, 
	virtualization@...ts.linux-foundation.org, 
	"Michael S . Tsirkin" <mst@...hat.com>, "David S . Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
	Jakub Kicinski <kuba@...nel.org>, Alexei Starovoitov <ast@...nel.org>, Daniel Borkmann <daniel@...earbox.net>, 
	Jesper Dangaard Brouer <hawk@...nel.org>, John Fastabend <john.fastabend@...il.com>, 
	Xuan Zhuo <xuanzhuo@...ux.alibaba.com>, Gavin Li <gavinl@...dia.com>
Subject: Re: [PATCH net v2 5/6] virtio-net: fix the vq coalescing setting for
 vq resize

On Thu, Oct 5, 2023 at 2:12 PM Heng Qi <hengqi@...ux.alibaba.com> wrote:
>
>
>
> 在 2023/10/3 下午6:41, Paolo Abeni 写道:
> > On Mon, 2023-09-25 at 15:53 +0800, Heng Qi 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")
> >> Cc: Gavin Li <gavinl@...dia.com>
> >> Signed-off-by: Heng Qi <hengqi@...ux.alibaba.com>
> > @Jason, since you commented on v1, waiting for your ack.
> >
> >> ---
> >>   drivers/net/virtio_net.c | 27 +++++++++++++++++++++++++++
> >>   1 file changed, 27 insertions(+)
> >>
> >> diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
> >> index 12ec3ae19b60..cb19b224419b 100644
> >> --- a/drivers/net/virtio_net.c
> >> +++ b/drivers/net/virtio_net.c
> >> @@ -2855,6 +2855,9 @@ static void virtnet_get_ringparam(struct net_device *dev,
> >>      ring->tx_pending = virtqueue_get_vring_size(vi->sq[0].vq);
> >>   }
> >>
> >> +static int virtnet_send_ctrl_coal_vq_cmd(struct virtnet_info *vi,
> >> +                                     u16 vqn, u32 max_usecs, u32 max_packets);
> >> +
> >>   static int virtnet_set_ringparam(struct net_device *dev,
> >>                               struct ethtool_ringparam *ring,
> >>                               struct kernel_ethtool_ringparam *kernel_ring,
> >> @@ -2890,12 +2893,36 @@ static int virtnet_set_ringparam(struct net_device *dev,
> >>                      err = virtnet_tx_resize(vi, sq, ring->tx_pending);
> >>                      if (err)
> >>                              return err;
> >> +
> >> +                    /* 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.
> >> +                     */
> >> +                    err = virtnet_send_ctrl_coal_vq_cmd(vi, txq2vq(i),
> >> +                                                        vi->intr_coal_tx.max_usecs,
> >> +                                                        vi->intr_coal_tx.max_packets);
> >> +                    if (err)
> >> +                            return err;
> >> +                    /* Save parameters */
> > As a very minor nit, I guess the comment could be dropped here (similar
> > to patch 4/6). @Heng Qi: please don't repost just for this, let's wait
> > for Jason' comments.
>
> Ok. We are currently on the National Day holiday, Jason may reply in a
> few days, thanks!

With the comments removed.

Acked-by: Jason Wang <jasowang@...hat.com>

Thanks

>
> > Cheers,
> >
> > Paolo
>