Re: [PATCH 19.11] net/virtio: fix indirect descriptor reconnection

[Christian Ehrhardt <christian.ehrhardt@canonical.com>]

On Tue, Dec 7, 2021 at 9:10 AM <xuan.ding@intel.com> wrote:
>
> From: Xuan Ding <xuan.ding@intel.com>
>
> [ upstream commit 04bcc80204db16ca77d1dd11a6ea1773214cc755 ]

Thank you, applied

> Add initialization for packed ring indirect descriptors
> in reconnection path.
>
> Fixes: 8c1df8846b15 ("net/virtio: fix packed ring indirect descricptors setup")
>
> Signed-off-by: Xuan Ding <xuan.ding@intel.com>
> Tested-by: Yinan Wang <yinan.wang@intel.com>
> Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>
> ---
>  drivers/net/virtio/virtqueue.c | 14 ++++++++++++++
>  1 file changed, 14 insertions(+)
>
> diff --git a/drivers/net/virtio/virtqueue.c b/drivers/net/virtio/virtqueue.c
> index 02c8b9fc5..8195aaa8c 100644
> --- a/drivers/net/virtio/virtqueue.c
> +++ b/drivers/net/virtio/virtqueue.c
> @@ -185,6 +185,8 @@ virtqueue_txvq_reset_packed(struct virtqueue *vq)
>         struct vq_desc_extra *dxp;
>         struct virtnet_tx *txvq;
>         uint16_t desc_idx;
> +       struct virtio_tx_region *txr;
> +       struct vring_packed_desc *start_dp;
>
>         vq->vq_used_cons_idx = 0;
>         vq->vq_desc_head_idx = 0;
> @@ -197,6 +199,7 @@ virtqueue_txvq_reset_packed(struct virtqueue *vq)
>         vq->vq_packed.event_flags_shadow = 0;
>
>         txvq = &vq->txq;
> +       txr = txvq->virtio_net_hdr_mz->addr;
>         memset(txvq->mz->addr, 0, txvq->mz->len);
>         memset(txvq->virtio_net_hdr_mz->addr, 0,
>                 txvq->virtio_net_hdr_mz->len);
> @@ -207,6 +210,17 @@ virtqueue_txvq_reset_packed(struct virtqueue *vq)
>                         rte_pktmbuf_free(dxp->cookie);
>                         dxp->cookie = NULL;
>                 }
> +
> +               if (vtpci_with_feature(vq->hw, VIRTIO_RING_F_INDIRECT_DESC)) {
> +                       /* first indirect descriptor is always the tx header */
> +                       start_dp = txr[desc_idx].tx_packed_indir;
> +                       vring_desc_init_indirect_packed(start_dp,
> +                               RTE_DIM(txr[desc_idx].tx_packed_indir));
> +                       start_dp->addr = txvq->virtio_net_hdr_mem
> +                               + desc_idx * sizeof(*txr)
> +                               + offsetof(struct virtio_tx_region, tx_hdr);
> +                       start_dp->len = vq->hw->vtnet_hdr_size;
> +               }
>         }
>
>         vring_desc_init_packed(vq, size);
> --
> 2.17.1
>


-- 
Christian Ehrhardt
Staff Engineer, Ubuntu Server
Canonical Ltd