From: Eli Cohen <elic@nvidia.com>
To: Jason Wang <jasowang@redhat.com>
Cc: <mst@redhat.com>, <virtualization@lists.linux-foundation.org>,
<linux-kernel@vger.kernel.org>, <kvm@vger.kernel.org>,
<netdev@vger.kernel.org>, <eli@mellanox.com>
Subject: Re: [PATCH V2 RESEND 4/4] virtio/vdpa: clear the virtqueue state during probe
Date: Wed, 2 Jun 2021 10:47:02 +0300 [thread overview]
Message-ID: <20210602074702.GH12498@mtl-vdi-166.wap.labs.mlnx> (raw)
In-Reply-To: <20210602021536.39525-5-jasowang@redhat.com>
On Wed, Jun 02, 2021 at 10:15:36AM +0800, Jason Wang wrote:
> From: Eli Cohen <elic@nvidia.com>
>
> Clear the available index as part of the initialization process to
> clear and values that might be left from previous usage of the device.
> For example, if the device was previously used by vhost_vdpa and now
> probed by vhost_vdpa, you want to start with indices.
>
> Fixes: c043b4a8cf3b ("virtio: introduce a vDPA based transport")
> Signed-off-by: Eli Cohen <elic@nvidia.com>
> Signed-off-by: Jason Wang <jasowang@redhat.com>
Reviewed-by: Eli Cohen <elic@nvidia.com>
> ---
> drivers/virtio/virtio_vdpa.c | 15 +++++++++++++++
> 1 file changed, 15 insertions(+)
>
> diff --git a/drivers/virtio/virtio_vdpa.c b/drivers/virtio/virtio_vdpa.c
> index e28acf482e0c..e1a141135992 100644
> --- a/drivers/virtio/virtio_vdpa.c
> +++ b/drivers/virtio/virtio_vdpa.c
> @@ -142,6 +142,8 @@ virtio_vdpa_setup_vq(struct virtio_device *vdev, unsigned int index,
> struct vdpa_callback cb;
> struct virtqueue *vq;
> u64 desc_addr, driver_addr, device_addr;
> + /* Assume split virtqueue, switch to packed if necessary */
> + struct vdpa_vq_state state = {0};
> unsigned long flags;
> u32 align, num;
> int err;
> @@ -191,6 +193,19 @@ virtio_vdpa_setup_vq(struct virtio_device *vdev, unsigned int index,
> goto err_vq;
> }
>
> + /* reset virtqueue state index */
> + if (virtio_has_feature(vdev, VIRTIO_F_RING_PACKED)) {
> + struct vdpa_vq_state_packed *s = &state.packed;
> +
> + s->last_avail_counter = 1;
> + s->last_avail_idx = 0;
> + s->last_used_counter = 1;
> + s->last_used_idx = 0;
> + }
> + err = ops->set_vq_state(vdpa, index, &state);
> + if (err)
> + goto err_vq;
> +
> ops->set_vq_ready(vdpa, index, 1);
>
> vq->priv = info;
> --
> 2.25.1
>
prev parent reply other threads:[~2021-06-02 7:47 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-02 2:15 [PATCH V2 RESEND 0/4] Packed virtqueue state support for vDPA Jason Wang
2021-06-02 2:15 ` [PATCH V2 RESEND 1/4] vdpa: support packed virtqueue for set/get_vq_state() Jason Wang
2021-06-02 7:44 ` Eli Cohen
2021-06-02 7:45 ` Eli Cohen
2021-06-02 2:15 ` [PATCH V2 RESEND 2/4] virtio-pci library: introduce vp_modern_get_driver_features() Jason Wang
2021-06-02 7:46 ` Eli Cohen
2021-06-02 2:15 ` [PATCH V2 RESEND 3/4] vp_vdpa: allow set vq state to initial state after reset Jason Wang
2021-06-02 7:46 ` Eli Cohen
2021-06-02 2:15 ` [PATCH V2 RESEND 4/4] virtio/vdpa: clear the virtqueue state during probe Jason Wang
2021-06-02 7:47 ` Eli Cohen [this message]
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