| Message ID | 20220720030436.79520-39-xuanzhuo@linux.alibaba.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | virtio pci support VIRTIO_F_RING_RESET | expand |
在 2022/7/20 11:04, Xuan Zhuo 写道: > This patch implements the resize function of the rx queues. > Based on this function, it is possible to modify the ring num of the > queue. > > Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com> > --- > drivers/net/virtio_net.c | 22 ++++++++++++++++++++++ > 1 file changed, 22 insertions(+) > > diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c > index fe4dc43c05a1..1115a8b59a08 100644 > --- a/drivers/net/virtio_net.c > +++ b/drivers/net/virtio_net.c > @@ -278,6 +278,8 @@ struct padded_vnet_hdr { > char padding[12]; > }; > > +static void virtnet_rq_free_unused_buf(struct virtqueue *vq, void *buf); > + > static bool is_xdp_frame(void *ptr) > { > return (unsigned long)ptr & VIRTIO_XDP_FLAG; > @@ -1846,6 +1848,26 @@ static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev) > return NETDEV_TX_OK; > } > > +static int virtnet_rx_resize(struct virtnet_info *vi, > + struct receive_queue *rq, u32 ring_num) > +{ > + int err, qindex; > + > + qindex = rq - vi->rq; > + > + napi_disable(&rq->napi); We need to disable refill work as well. So this series might need rebasing on top of https://lore.kernel.org/netdev/20220704074859.16912-1-jasowang@redhat.com/ I will send a new version (probably tomorrow). Thanks > + > + err = virtqueue_resize(rq->vq, ring_num, virtnet_rq_free_unused_buf); > + if (err) > + netdev_err(vi->dev, "resize rx fail: rx queue index: %d err: %d\n", qindex, err); > + > + if (!try_fill_recv(vi, rq, GFP_KERNEL)) > + schedule_delayed_work(&vi->refill, 0); > + > + virtnet_napi_enable(rq->vq, &rq->napi); > + return err; > +} > + > /* > * Send command via the control virtqueue and check status. Commands > * supported by the hypervisor, as indicated by feature bits, should
On Thu, 21 Jul 2022 17:25:59 +0800, Jason Wang <jasowang@redhat.com> wrote: > > 在 2022/7/20 11:04, Xuan Zhuo 写道: > > This patch implements the resize function of the rx queues. > > Based on this function, it is possible to modify the ring num of the > > queue. > > > > Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com> > > --- > > drivers/net/virtio_net.c | 22 ++++++++++++++++++++++ > > 1 file changed, 22 insertions(+) > > > > diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c > > index fe4dc43c05a1..1115a8b59a08 100644 > > --- a/drivers/net/virtio_net.c > > +++ b/drivers/net/virtio_net.c > > @@ -278,6 +278,8 @@ struct padded_vnet_hdr { > > char padding[12]; > > }; > > > > +static void virtnet_rq_free_unused_buf(struct virtqueue *vq, void *buf); > > + > > static bool is_xdp_frame(void *ptr) > > { > > return (unsigned long)ptr & VIRTIO_XDP_FLAG; > > @@ -1846,6 +1848,26 @@ static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev) > > return NETDEV_TX_OK; > > } > > > > +static int virtnet_rx_resize(struct virtnet_info *vi, > > + struct receive_queue *rq, u32 ring_num) > > +{ > > + int err, qindex; > > + > > + qindex = rq - vi->rq; > > + > > + napi_disable(&rq->napi); > > > We need to disable refill work as well. So this series might need > rebasing on top of > > https://lore.kernel.org/netdev/20220704074859.16912-1-jasowang@redhat.com/ I understand that your patch is used to solve the situation where dev is destoryed but refill work is running. And is there such a possibility here? Or is there any other scenario that I'm not expecting? Thanks. > > I will send a new version (probably tomorrow). > > Thanks > > > > + > > + err = virtqueue_resize(rq->vq, ring_num, virtnet_rq_free_unused_buf); > > + if (err) > > + netdev_err(vi->dev, "resize rx fail: rx queue index: %d err: %d\n", qindex, err); > > + > > + if (!try_fill_recv(vi, rq, GFP_KERNEL)) > > + schedule_delayed_work(&vi->refill, 0); > > + > > + virtnet_napi_enable(rq->vq, &rq->napi); > > + return err; > > +} > > + > > /* > > * Send command via the control virtqueue and check status. Commands > > * supported by the hypervisor, as indicated by feature bits, should >
On Mon, Jul 25, 2022 at 2:43 PM Xuan Zhuo <xuanzhuo@linux.alibaba.com> wrote: > > On Thu, 21 Jul 2022 17:25:59 +0800, Jason Wang <jasowang@redhat.com> wrote: > > > > 在 2022/7/20 11:04, Xuan Zhuo 写道: > > > This patch implements the resize function of the rx queues. > > > Based on this function, it is possible to modify the ring num of the > > > queue. > > > > > > Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com> > > > --- > > > drivers/net/virtio_net.c | 22 ++++++++++++++++++++++ > > > 1 file changed, 22 insertions(+) > > > > > > diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c > > > index fe4dc43c05a1..1115a8b59a08 100644 > > > --- a/drivers/net/virtio_net.c > > > +++ b/drivers/net/virtio_net.c > > > @@ -278,6 +278,8 @@ struct padded_vnet_hdr { > > > char padding[12]; > > > }; > > > > > > +static void virtnet_rq_free_unused_buf(struct virtqueue *vq, void *buf); > > > + > > > static bool is_xdp_frame(void *ptr) > > > { > > > return (unsigned long)ptr & VIRTIO_XDP_FLAG; > > > @@ -1846,6 +1848,26 @@ static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev) > > > return NETDEV_TX_OK; > > > } > > > > > > +static int virtnet_rx_resize(struct virtnet_info *vi, > > > + struct receive_queue *rq, u32 ring_num) > > > +{ > > > + int err, qindex; > > > + > > > + qindex = rq - vi->rq; > > > + > > > + napi_disable(&rq->napi); > > > > > > We need to disable refill work as well. So this series might need > > rebasing on top of > > > > https://lore.kernel.org/netdev/20220704074859.16912-1-jasowang@redhat.com/ > > I understand that your patch is used to solve the situation where dev is > destoryed but refill work is running. > > And is there such a possibility here? E.g the refill work runs in parallel with this function? Thanks > Or is there any other scenario that I'm > not expecting? > > Thanks. > > > > > > I will send a new version (probably tomorrow). > > > > Thanks > > > > > > > + > > > + err = virtqueue_resize(rq->vq, ring_num, virtnet_rq_free_unused_buf); > > > + if (err) > > > + netdev_err(vi->dev, "resize rx fail: rx queue index: %d err: %d\n", qindex, err); > > > + > > > + if (!try_fill_recv(vi, rq, GFP_KERNEL)) > > > + schedule_delayed_work(&vi->refill, 0); > > > + > > > + virtnet_napi_enable(rq->vq, &rq->napi); > > > + return err; > > > +} > > > + > > > /* > > > * Send command via the control virtqueue and check status. Commands > > > * supported by the hypervisor, as indicated by feature bits, should > > >
On Mon, 25 Jul 2022 14:57:11 +0800, Jason Wang <jasowang@redhat.com> wrote: > On Mon, Jul 25, 2022 at 2:43 PM Xuan Zhuo <xuanzhuo@linux.alibaba.com> wrote: > > > > On Thu, 21 Jul 2022 17:25:59 +0800, Jason Wang <jasowang@redhat.com> wrote: > > > > > > 在 2022/7/20 11:04, Xuan Zhuo 写道: > > > > This patch implements the resize function of the rx queues. > > > > Based on this function, it is possible to modify the ring num of the > > > > queue. > > > > > > > > Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com> > > > > --- > > > > drivers/net/virtio_net.c | 22 ++++++++++++++++++++++ > > > > 1 file changed, 22 insertions(+) > > > > > > > > diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c > > > > index fe4dc43c05a1..1115a8b59a08 100644 > > > > --- a/drivers/net/virtio_net.c > > > > +++ b/drivers/net/virtio_net.c > > > > @@ -278,6 +278,8 @@ struct padded_vnet_hdr { > > > > char padding[12]; > > > > }; > > > > > > > > +static void virtnet_rq_free_unused_buf(struct virtqueue *vq, void *buf); > > > > + > > > > static bool is_xdp_frame(void *ptr) > > > > { > > > > return (unsigned long)ptr & VIRTIO_XDP_FLAG; > > > > @@ -1846,6 +1848,26 @@ static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev) > > > > return NETDEV_TX_OK; > > > > } > > > > > > > > +static int virtnet_rx_resize(struct virtnet_info *vi, > > > > + struct receive_queue *rq, u32 ring_num) > > > > +{ > > > > + int err, qindex; > > > > + > > > > + qindex = rq - vi->rq; > > > > + > > > > + napi_disable(&rq->napi); > > > > > > > > > We need to disable refill work as well. So this series might need > > > rebasing on top of > > > > > > https://lore.kernel.org/netdev/20220704074859.16912-1-jasowang@redhat.com/ > > > > I understand that your patch is used to solve the situation where dev is > > destoryed but refill work is running. > > > > And is there such a possibility here? > > E.g the refill work runs in parallel with this function? napi_disable enables lock-like functionality. So I think it's safe. Thanks. > > Thanks > > > Or is there any other scenario that I'm > > not expecting? > > > > Thanks. > > > > > > > > > > I will send a new version (probably tomorrow). > > > > > > Thanks > > > > > > > > > > + > > > > + err = virtqueue_resize(rq->vq, ring_num, virtnet_rq_free_unused_buf); > > > > + if (err) > > > > + netdev_err(vi->dev, "resize rx fail: rx queue index: %d err: %d\n", qindex, err); > > > > + > > > > + if (!try_fill_recv(vi, rq, GFP_KERNEL)) > > > > + schedule_delayed_work(&vi->refill, 0); > > > > + > > > > + virtnet_napi_enable(rq->vq, &rq->napi); > > > > + return err; > > > > +} > > > > + > > > > /* > > > > * Send command via the control virtqueue and check status. Commands > > > > * supported by the hypervisor, as indicated by feature bits, should > > > > > >
On Mon, Jul 25, 2022 at 3:23 PM Xuan Zhuo <xuanzhuo@linux.alibaba.com> wrote: > > On Mon, 25 Jul 2022 14:57:11 +0800, Jason Wang <jasowang@redhat.com> wrote: > > On Mon, Jul 25, 2022 at 2:43 PM Xuan Zhuo <xuanzhuo@linux.alibaba.com> wrote: > > > > > > On Thu, 21 Jul 2022 17:25:59 +0800, Jason Wang <jasowang@redhat.com> wrote: > > > > > > > > 在 2022/7/20 11:04, Xuan Zhuo 写道: > > > > > This patch implements the resize function of the rx queues. > > > > > Based on this function, it is possible to modify the ring num of the > > > > > queue. > > > > > > > > > > Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com> > > > > > --- > > > > > drivers/net/virtio_net.c | 22 ++++++++++++++++++++++ > > > > > 1 file changed, 22 insertions(+) > > > > > > > > > > diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c > > > > > index fe4dc43c05a1..1115a8b59a08 100644 > > > > > --- a/drivers/net/virtio_net.c > > > > > +++ b/drivers/net/virtio_net.c > > > > > @@ -278,6 +278,8 @@ struct padded_vnet_hdr { > > > > > char padding[12]; > > > > > }; > > > > > > > > > > +static void virtnet_rq_free_unused_buf(struct virtqueue *vq, void *buf); > > > > > + > > > > > static bool is_xdp_frame(void *ptr) > > > > > { > > > > > return (unsigned long)ptr & VIRTIO_XDP_FLAG; > > > > > @@ -1846,6 +1848,26 @@ static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev) > > > > > return NETDEV_TX_OK; > > > > > } > > > > > > > > > > +static int virtnet_rx_resize(struct virtnet_info *vi, > > > > > + struct receive_queue *rq, u32 ring_num) > > > > > +{ > > > > > + int err, qindex; > > > > > + > > > > > + qindex = rq - vi->rq; > > > > > + > > > > > + napi_disable(&rq->napi); > > > > > > > > > > > > We need to disable refill work as well. So this series might need > > > > rebasing on top of > > > > > > > > https://lore.kernel.org/netdev/20220704074859.16912-1-jasowang@redhat.com/ > > > > > > I understand that your patch is used to solve the situation where dev is > > > destoryed but refill work is running. > > > > > > And is there such a possibility here? > > > > E.g the refill work runs in parallel with this function? > > napi_disable enables lock-like functionality. So I think it's safe. > Ok, right, since there will be a napi_enable() soon afterwards. So Acked-by: Jason Wang <jasowang@redhat.com> Thanks > Thanks. > > > > > Thanks > > > > > Or is there any other scenario that I'm > > > not expecting? > > > > > > Thanks. > > > > > > > > > > > > > > I will send a new version (probably tomorrow). > > > > > > > > Thanks > > > > > > > > > > > > > + > > > > > + err = virtqueue_resize(rq->vq, ring_num, virtnet_rq_free_unused_buf); > > > > > + if (err) > > > > > + netdev_err(vi->dev, "resize rx fail: rx queue index: %d err: %d\n", qindex, err); > > > > > + > > > > > + if (!try_fill_recv(vi, rq, GFP_KERNEL)) > > > > > + schedule_delayed_work(&vi->refill, 0); > > > > > + > > > > > + virtnet_napi_enable(rq->vq, &rq->napi); > > > > > + return err; > > > > > +} > > > > > + > > > > > /* > > > > > * Send command via the control virtqueue and check status. Commands > > > > > * supported by the hypervisor, as indicated by feature bits, should > > > > > > > > > >
diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c index fe4dc43c05a1..1115a8b59a08 100644 --- a/drivers/net/virtio_net.c +++ b/drivers/net/virtio_net.c @@ -278,6 +278,8 @@ struct padded_vnet_hdr { char padding[12]; }; +static void virtnet_rq_free_unused_buf(struct virtqueue *vq, void *buf); + static bool is_xdp_frame(void *ptr) { return (unsigned long)ptr & VIRTIO_XDP_FLAG; @@ -1846,6 +1848,26 @@ static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev) return NETDEV_TX_OK; } +static int virtnet_rx_resize(struct virtnet_info *vi, + struct receive_queue *rq, u32 ring_num) +{ + int err, qindex; + + qindex = rq - vi->rq; + + napi_disable(&rq->napi); + + err = virtqueue_resize(rq->vq, ring_num, virtnet_rq_free_unused_buf); + if (err) + netdev_err(vi->dev, "resize rx fail: rx queue index: %d err: %d\n", qindex, err); + + if (!try_fill_recv(vi, rq, GFP_KERNEL)) + schedule_delayed_work(&vi->refill, 0); + + virtnet_napi_enable(rq->vq, &rq->napi); + return err; +} + /* * Send command via the control virtqueue and check status. Commands * supported by the hypervisor, as indicated by feature bits, should
This patch implements the resize function of the rx queues. Based on this function, it is possible to modify the ring num of the queue. Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com> --- drivers/net/virtio_net.c | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+)