[PATCH v2 1/2] vhost: fix descs count in async vhost packed ring

[PATCH v2 1/2] vhost: fix descs count in async vhost packed ring

[Cheng Jiang]

When vhost receive packets from the front-end using packed virtqueue, it
might use multiple descriptors for one packet, so we need calculate and
record the descriptor number for each packet to update available
descriptor counter and used descriptor counter, and rollback when DMA
ring is full.

Fixes: fe8477ebbd94 ("vhost: support async packed ring dequeue")
Cc: stable@dpdk.org

Signed-off-by: Cheng Jiang <cheng1.jiang@intel.com>
---
 lib/vhost/virtio_net.c | 24 +++++++++++++++---------
 1 file changed, 15 insertions(+), 9 deletions(-)

diff --git a/lib/vhost/virtio_net.c b/lib/vhost/virtio_net.c
index 8f4d0f0502..457ac2e92a 100644
--- a/lib/vhost/virtio_net.c
+++ b/lib/vhost/virtio_net.c
@@ -3548,14 +3548,15 @@ virtio_dev_tx_async_split_compliant(struct virtio_net *dev,
 }
 
 static __rte_always_inline void
-vhost_async_shadow_dequeue_single_packed(struct vhost_virtqueue *vq, uint16_t buf_id)
+vhost_async_shadow_dequeue_single_packed(struct vhost_virtqueue *vq,
+				uint16_t buf_id, uint16_t count)
 {
 	struct vhost_async *async = vq->async;
 	uint16_t idx = async->buffer_idx_packed;
 
 	async->buffers_packed[idx].id = buf_id;
 	async->buffers_packed[idx].len = 0;
-	async->buffers_packed[idx].count = 1;
+	async->buffers_packed[idx].count = count;
 
 	async->buffer_idx_packed++;
 	if (async->buffer_idx_packed >= vq->size)
@@ -3576,6 +3577,8 @@ virtio_dev_tx_async_single_packed(struct virtio_net *dev,
 	uint16_t nr_vec = 0;
 	uint32_t buf_len;
 	struct buf_vector buf_vec[BUF_VECTOR_MAX];
+	struct vhost_async *async = vq->async;
+	struct async_inflight_info *pkts_info = async->pkts_info;
 	static bool allocerr_warned;
 
 	if (unlikely(fill_vec_buf_packed(dev, vq, vq->last_avail_idx, &desc_count,
@@ -3604,8 +3607,12 @@ virtio_dev_tx_async_single_packed(struct virtio_net *dev,
 		return -1;
 	}
 
+	pkts_info[slot_idx].descs = desc_count;
+
 	/* update async shadow packed ring */
-	vhost_async_shadow_dequeue_single_packed(vq, buf_id);
+	vhost_async_shadow_dequeue_single_packed(vq, buf_id, desc_count);
+
+	vq_inc_last_avail_packed(vq, desc_count);
 
 	return err;
 }
@@ -3644,9 +3651,6 @@ virtio_dev_tx_async_packed(struct virtio_net *dev, struct vhost_virtqueue *vq,
 		}
 
 		pkts_info[slot_idx].mbuf = pkt;
-
-		vq_inc_last_avail_packed(vq, 1);
-
 	}
 
 	n_xfer = vhost_async_dma_transfer(dev, vq, dma_id, vchan_id, async->pkts_idx,
@@ -3657,6 +3661,8 @@ virtio_dev_tx_async_packed(struct virtio_net *dev, struct vhost_virtqueue *vq,
 	pkt_err = pkt_idx - n_xfer;
 
 	if (unlikely(pkt_err)) {
+		uint16_t descs_err = 0;
+
 		pkt_idx -= pkt_err;
 
 		/**
@@ -3673,10 +3679,10 @@ virtio_dev_tx_async_packed(struct virtio_net *dev, struct vhost_virtqueue *vq,
 		}
 
 		/* recover available ring */
-		if (vq->last_avail_idx >= pkt_err) {
-			vq->last_avail_idx -= pkt_err;
+		if (vq->last_avail_idx >= descs_err) {
+			vq->last_avail_idx -= descs_err;
 		} else {
-			vq->last_avail_idx += vq->size - pkt_err;
+			vq->last_avail_idx += vq->size - descs_err;
 			vq->avail_wrap_counter ^= 1;
 		}
 	}
-- 
2.35.1

[PATCH v2 2/2] vhost: fix slot index calculation in async vhost

[Cheng Jiang]

When the packet receiving failure and the DMA ring full occur
simultaneously in the asynchronous vhost, the slot_idx needs to be
decreased by 1. For packed virtqueue, the slot index should be
ring_size - 1, if the slot_idx is currently 0, since the ring size is
not necessarily the power of 2.

Fixes: 84d5204310d7 ("vhost: support async dequeue for split ring")
Fixes: fe8477ebbd94 ("vhost: support async packed ring dequeue")
Cc: stable@dpdk.org

Signed-off-by: Cheng Jiang <cheng1.jiang@intel.com>
---
 lib/vhost/virtio_net.c | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/lib/vhost/virtio_net.c b/lib/vhost/virtio_net.c
index 457ac2e92a..efebd063d7 100644
--- a/lib/vhost/virtio_net.c
+++ b/lib/vhost/virtio_net.c
@@ -3457,6 +3457,7 @@ virtio_dev_tx_async_split(struct virtio_net *dev, struct vhost_virtqueue *vq,
 				allocerr_warned = true;
 			}
 			dropped = true;
+			slot_idx--;
 			break;
 		}
 
@@ -3647,6 +3648,12 @@ virtio_dev_tx_async_packed(struct virtio_net *dev, struct vhost_virtqueue *vq,
 		if (unlikely(virtio_dev_tx_async_single_packed(dev, vq, mbuf_pool, pkt,
 				slot_idx, legacy_ol_flags))) {
 			rte_pktmbuf_free_bulk(&pkts_prealloc[pkt_idx], count - pkt_idx);
+
+			if (slot_idx == 0)
+				slot_idx = vq->size - 1;
+			else
+				slot_idx--;
+
 			break;
 		}
 
@@ -3674,8 +3681,13 @@ virtio_dev_tx_async_packed(struct virtio_net *dev, struct vhost_virtqueue *vq,
 			async->buffer_idx_packed += vq->size - pkt_err;
 
 		while (pkt_err-- > 0) {
-			rte_pktmbuf_free(pkts_info[slot_idx % vq->size].mbuf);
-			slot_idx--;
+			rte_pktmbuf_free(pkts_info[slot_idx].mbuf);
+			descs_err += pkts_info[slot_idx].descs;
+
+			if (slot_idx == 0)
+				slot_idx = vq->size - 1;
+			else
+				slot_idx--;
 		}
 
 		/* recover available ring */
-- 
2.35.1

RE: [PATCH v2 2/2] vhost: fix slot index calculation in async vhost

[Ling, WeiX]

> -----Original Message-----
> From: Cheng Jiang <cheng1.jiang@intel.com>
> Sent: Tuesday, October 11, 2022 11:08 AM
> To: maxime.coquelin@redhat.com; Xia, Chenbo <chenbo.xia@intel.com>
> Cc: dev@dpdk.org; Hu, Jiayu <jiayu.hu@intel.com>; Ding, Xuan
> <xuan.ding@intel.com>; Ma, WenwuX <wenwux.ma@intel.com>; Wang,
> YuanX <yuanx.wang@intel.com>; Yang, YvonneX
> <yvonnex.yang@intel.com>; He, Xingguang <xingguang.he@intel.com>;
> Jiang, Cheng1 <cheng1.jiang@intel.com>; stable@dpdk.org
> Subject: [PATCH v2 2/2] vhost: fix slot index calculation in async vhost
>
> When the packet receiving failure and the DMA ring full occur simultaneously
> in the asynchronous vhost, the slot_idx needs to be decreased by 1. For
> packed virtqueue, the slot index should be ring_size - 1, if the slot_idx is
> currently 0, since the ring size is not necessarily the power of 2.
>
> Fixes: 84d5204310d7 ("vhost: support async dequeue for split ring")
> Fixes: fe8477ebbd94 ("vhost: support async packed ring dequeue")
> Cc: stable@dpdk.org
>
> Signed-off-by: Cheng Jiang <cheng1.jiang@intel.com>
> ---
Tested-by: Wei Ling <weix.ling@intel.com>

Re: [PATCH v2 1/2] vhost: fix descs count in async vhost packed ring

[Maxime Coquelin]

On 10/11/22 05:08, Cheng Jiang wrote:
> When vhost receive packets from the front-end using packed virtqueue, it

receives

> might use multiple descriptors for one packet, so we need calculate and

to calculate

> record the descriptor number for each packet to update available
> descriptor counter and used descriptor counter, and rollback when DMA
> ring is full.
> 
> Fixes: fe8477ebbd94 ("vhost: support async packed ring dequeue")
> Cc: stable@dpdk.org
> 
> Signed-off-by: Cheng Jiang <cheng1.jiang@intel.com>
> ---
>   lib/vhost/virtio_net.c | 24 +++++++++++++++---------
>   1 file changed, 15 insertions(+), 9 deletions(-)
> 
> diff --git a/lib/vhost/virtio_net.c b/lib/vhost/virtio_net.c
> index 8f4d0f0502..457ac2e92a 100644
> --- a/lib/vhost/virtio_net.c
> +++ b/lib/vhost/virtio_net.c
> @@ -3548,14 +3548,15 @@ virtio_dev_tx_async_split_compliant(struct virtio_net *dev,
>   }
>   
>   static __rte_always_inline void
> -vhost_async_shadow_dequeue_single_packed(struct vhost_virtqueue *vq, uint16_t buf_id)
> +vhost_async_shadow_dequeue_single_packed(struct vhost_virtqueue *vq,
> +				uint16_t buf_id, uint16_t count)
>   {
>   	struct vhost_async *async = vq->async;
>   	uint16_t idx = async->buffer_idx_packed;
>   
>   	async->buffers_packed[idx].id = buf_id;
>   	async->buffers_packed[idx].len = 0;
> -	async->buffers_packed[idx].count = 1;
> +	async->buffers_packed[idx].count = count;
>   
>   	async->buffer_idx_packed++;
>   	if (async->buffer_idx_packed >= vq->size)
> @@ -3576,6 +3577,8 @@ virtio_dev_tx_async_single_packed(struct virtio_net *dev,
>   	uint16_t nr_vec = 0;
>   	uint32_t buf_len;
>   	struct buf_vector buf_vec[BUF_VECTOR_MAX];
> +	struct vhost_async *async = vq->async;
> +	struct async_inflight_info *pkts_info = async->pkts_info;
>   	static bool allocerr_warned;
>   
>   	if (unlikely(fill_vec_buf_packed(dev, vq, vq->last_avail_idx, &desc_count,
> @@ -3604,8 +3607,12 @@ virtio_dev_tx_async_single_packed(struct virtio_net *dev,
>   		return -1;
>   	}
>   
> +	pkts_info[slot_idx].descs = desc_count;
> +
>   	/* update async shadow packed ring */
> -	vhost_async_shadow_dequeue_single_packed(vq, buf_id);
> +	vhost_async_shadow_dequeue_single_packed(vq, buf_id, desc_count);
> +
> +	vq_inc_last_avail_packed(vq, desc_count);
>   
>   	return err;
>   }
> @@ -3644,9 +3651,6 @@ virtio_dev_tx_async_packed(struct virtio_net *dev, struct vhost_virtqueue *vq,
>   		}
>   
>   		pkts_info[slot_idx].mbuf = pkt;
> -
> -		vq_inc_last_avail_packed(vq, 1);
> -
>   	}
>   
>   	n_xfer = vhost_async_dma_transfer(dev, vq, dma_id, vchan_id, async->pkts_idx,
> @@ -3657,6 +3661,8 @@ virtio_dev_tx_async_packed(struct virtio_net *dev, struct vhost_virtqueue *vq,
>   	pkt_err = pkt_idx - n_xfer;
>   
>   	if (unlikely(pkt_err)) {
> +		uint16_t descs_err = 0;
> +
>   		pkt_idx -= pkt_err;
>   
>   		/**
> @@ -3673,10 +3679,10 @@ virtio_dev_tx_async_packed(struct virtio_net *dev, struct vhost_virtqueue *vq,
>   		}
>   
>   		/* recover available ring */
> -		if (vq->last_avail_idx >= pkt_err) {
> -			vq->last_avail_idx -= pkt_err;
> +		if (vq->last_avail_idx >= descs_err) {
> +			vq->last_avail_idx -= descs_err;
>   		} else {
> -			vq->last_avail_idx += vq->size - pkt_err;
> +			vq->last_avail_idx += vq->size - descs_err;
>   			vq->avail_wrap_counter ^= 1;
>   		}
>   	}

If only the commit message typos need to be fixed, maybe no need to send
a new version.

Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>

Thanks,
Maxime

Re: [PATCH v2 2/2] vhost: fix slot index calculation in async vhost

[Maxime Coquelin]

On 10/11/22 05:08, Cheng Jiang wrote:
> When the packet receiving failure and the DMA ring full occur
> simultaneously in the asynchronous vhost, the slot_idx needs to be
> decreased by 1. For packed virtqueue, the slot index should be
> ring_size - 1, if the slot_idx is currently 0, since the ring size is
> not necessarily the power of 2.
> 
> Fixes: 84d5204310d7 ("vhost: support async dequeue for split ring")
> Fixes: fe8477ebbd94 ("vhost: support async packed ring dequeue")
> Cc: stable@dpdk.org
> 
> Signed-off-by: Cheng Jiang <cheng1.jiang@intel.com>
> ---
>   lib/vhost/virtio_net.c | 16 ++++++++++++++--
>   1 file changed, 14 insertions(+), 2 deletions(-)
> 
> diff --git a/lib/vhost/virtio_net.c b/lib/vhost/virtio_net.c
> index 457ac2e92a..efebd063d7 100644
> --- a/lib/vhost/virtio_net.c
> +++ b/lib/vhost/virtio_net.c
> @@ -3457,6 +3457,7 @@ virtio_dev_tx_async_split(struct virtio_net *dev, struct vhost_virtqueue *vq,
>   				allocerr_warned = true;
>   			}
>   			dropped = true;
> +			slot_idx--;
>   			break;
>   		}
>   
> @@ -3647,6 +3648,12 @@ virtio_dev_tx_async_packed(struct virtio_net *dev, struct vhost_virtqueue *vq,
>   		if (unlikely(virtio_dev_tx_async_single_packed(dev, vq, mbuf_pool, pkt,
>   				slot_idx, legacy_ol_flags))) {
>   			rte_pktmbuf_free_bulk(&pkts_prealloc[pkt_idx], count - pkt_idx);
> +
> +			if (slot_idx == 0)
> +				slot_idx = vq->size - 1;
> +			else
> +				slot_idx--;
> +
>   			break;
>   		}
>   
> @@ -3674,8 +3681,13 @@ virtio_dev_tx_async_packed(struct virtio_net *dev, struct vhost_virtqueue *vq,
>   			async->buffer_idx_packed += vq->size - pkt_err;
>   
>   		while (pkt_err-- > 0) {
> -			rte_pktmbuf_free(pkts_info[slot_idx % vq->size].mbuf);
> -			slot_idx--;
> +			rte_pktmbuf_free(pkts_info[slot_idx].mbuf);
> +			descs_err += pkts_info[slot_idx].descs;
> +
> +			if (slot_idx == 0)
> +				slot_idx = vq->size - 1;
> +			else
> +				slot_idx--;
>   		}
>   
>   		/* recover available ring */

Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>

Thanks,
Maxime

RE: [PATCH v2 1/2] vhost: fix descs count in async vhost packed ring

[Jiang, Cheng1]

Hi Maxime,

> -----Original Message-----
> From: Maxime Coquelin <maxime.coquelin@redhat.com>
> Sent: Friday, October 21, 2022 4:16 PM
> To: Jiang, Cheng1 <cheng1.jiang@intel.com>; Xia, Chenbo
> <chenbo.xia@intel.com>
> Cc: dev@dpdk.org; Hu, Jiayu <jiayu.hu@intel.com>; Ding, Xuan
> <xuan.ding@intel.com>; Ma, WenwuX <wenwux.ma@intel.com>; Wang,
> YuanX <yuanx.wang@intel.com>; Yang, YvonneX
> <yvonnex.yang@intel.com>; He, Xingguang <xingguang.he@intel.com>;
> stable@dpdk.org
> Subject: Re: [PATCH v2 1/2] vhost: fix descs count in async vhost packed ring
> 
> 
> 
> On 10/11/22 05:08, Cheng Jiang wrote:
> > When vhost receive packets from the front-end using packed virtqueue,
> > it
> 
> receives
> 
> > might use multiple descriptors for one packet, so we need calculate
> > and
> 
> to calculate
> 
> > record the descriptor number for each packet to update available
> > descriptor counter and used descriptor counter, and rollback when DMA
> > ring is full.
> >
> > Fixes: fe8477ebbd94 ("vhost: support async packed ring dequeue")
> > Cc: stable@dpdk.org
> >
> > Signed-off-by: Cheng Jiang <cheng1.jiang@intel.com>
> > ---
> >   lib/vhost/virtio_net.c | 24 +++++++++++++++---------
> >   1 file changed, 15 insertions(+), 9 deletions(-)
> >
> > diff --git a/lib/vhost/virtio_net.c b/lib/vhost/virtio_net.c index
> > 8f4d0f0502..457ac2e92a 100644
> > --- a/lib/vhost/virtio_net.c
> > +++ b/lib/vhost/virtio_net.c
> > @@ -3548,14 +3548,15 @@ virtio_dev_tx_async_split_compliant(struct
> virtio_net *dev,
> >   }
> >
> >   static __rte_always_inline void
> > -vhost_async_shadow_dequeue_single_packed(struct vhost_virtqueue
> *vq,
> > uint16_t buf_id)
> > +vhost_async_shadow_dequeue_single_packed(struct vhost_virtqueue
> *vq,
> > +				uint16_t buf_id, uint16_t count)
> >   {
> >   	struct vhost_async *async = vq->async;
> >   	uint16_t idx = async->buffer_idx_packed;
> >
> >   	async->buffers_packed[idx].id = buf_id;
> >   	async->buffers_packed[idx].len = 0;
> > -	async->buffers_packed[idx].count = 1;
> > +	async->buffers_packed[idx].count = count;
> >
> >   	async->buffer_idx_packed++;
> >   	if (async->buffer_idx_packed >= vq->size) @@ -3576,6 +3577,8 @@
> > virtio_dev_tx_async_single_packed(struct virtio_net *dev,
> >   	uint16_t nr_vec = 0;
> >   	uint32_t buf_len;
> >   	struct buf_vector buf_vec[BUF_VECTOR_MAX];
> > +	struct vhost_async *async = vq->async;
> > +	struct async_inflight_info *pkts_info = async->pkts_info;
> >   	static bool allocerr_warned;
> >
> >   	if (unlikely(fill_vec_buf_packed(dev, vq, vq->last_avail_idx,
> > &desc_count, @@ -3604,8 +3607,12 @@
> virtio_dev_tx_async_single_packed(struct virtio_net *dev,
> >   		return -1;
> >   	}
> >
> > +	pkts_info[slot_idx].descs = desc_count;
> > +
> >   	/* update async shadow packed ring */
> > -	vhost_async_shadow_dequeue_single_packed(vq, buf_id);
> > +	vhost_async_shadow_dequeue_single_packed(vq, buf_id,
> desc_count);
> > +
> > +	vq_inc_last_avail_packed(vq, desc_count);
> >
> >   	return err;
> >   }
> > @@ -3644,9 +3651,6 @@ virtio_dev_tx_async_packed(struct virtio_net
> *dev, struct vhost_virtqueue *vq,
> >   		}
> >
> >   		pkts_info[slot_idx].mbuf = pkt;
> > -
> > -		vq_inc_last_avail_packed(vq, 1);
> > -
> >   	}
> >
> >   	n_xfer = vhost_async_dma_transfer(dev, vq, dma_id, vchan_id,
> > async->pkts_idx, @@ -3657,6 +3661,8 @@
> virtio_dev_tx_async_packed(struct virtio_net *dev, struct vhost_virtqueue
> *vq,
> >   	pkt_err = pkt_idx - n_xfer;
> >
> >   	if (unlikely(pkt_err)) {
> > +		uint16_t descs_err = 0;
> > +
> >   		pkt_idx -= pkt_err;
> >
> >   		/**
> > @@ -3673,10 +3679,10 @@ virtio_dev_tx_async_packed(struct virtio_net
> *dev, struct vhost_virtqueue *vq,
> >   		}
> >
> >   		/* recover available ring */
> > -		if (vq->last_avail_idx >= pkt_err) {
> > -			vq->last_avail_idx -= pkt_err;
> > +		if (vq->last_avail_idx >= descs_err) {
> > +			vq->last_avail_idx -= descs_err;
> >   		} else {
> > -			vq->last_avail_idx += vq->size - pkt_err;
> > +			vq->last_avail_idx += vq->size - descs_err;
> >   			vq->avail_wrap_counter ^= 1;
> >   		}
> >   	}
> 
> If only the commit message typos need to be fixed, maybe no need to send
> a new version.

Sure, thanks a lot!
Cheng

> 
> Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>
> 
> Thanks,
> Maxime

RE: [PATCH v2 1/2] vhost: fix descs count in async vhost packed ring

[Xia, Chenbo]

> -----Original Message-----
> From: Jiang, Cheng1 <cheng1.jiang@intel.com>
> Sent: Monday, October 24, 2022 9:42 AM
> To: Maxime Coquelin <maxime.coquelin@redhat.com>; Xia, Chenbo
> <chenbo.xia@intel.com>
> Cc: dev@dpdk.org; Hu, Jiayu <jiayu.hu@intel.com>; Ding, Xuan
> <xuan.ding@intel.com>; Ma, WenwuX <wenwux.ma@intel.com>; Wang, YuanX
> <yuanx.wang@intel.com>; Yang, YvonneX <yvonnex.yang@intel.com>; He,
> Xingguang <xingguang.he@intel.com>; stable@dpdk.org
> Subject: RE: [PATCH v2 1/2] vhost: fix descs count in async vhost packed
> ring
> 
> Hi Maxime,
> 
> > -----Original Message-----
> > From: Maxime Coquelin <maxime.coquelin@redhat.com>
> > Sent: Friday, October 21, 2022 4:16 PM
> > To: Jiang, Cheng1 <cheng1.jiang@intel.com>; Xia, Chenbo
> > <chenbo.xia@intel.com>
> > Cc: dev@dpdk.org; Hu, Jiayu <jiayu.hu@intel.com>; Ding, Xuan
> > <xuan.ding@intel.com>; Ma, WenwuX <wenwux.ma@intel.com>; Wang,
> > YuanX <yuanx.wang@intel.com>; Yang, YvonneX
> > <yvonnex.yang@intel.com>; He, Xingguang <xingguang.he@intel.com>;
> > stable@dpdk.org
> > Subject: Re: [PATCH v2 1/2] vhost: fix descs count in async vhost packed
> ring
> >
> >
> >
> > On 10/11/22 05:08, Cheng Jiang wrote:
> > > When vhost receive packets from the front-end using packed virtqueue,
> > > it
> >
> > receives
> >
> > > might use multiple descriptors for one packet, so we need calculate
> > > and
> >
> > to calculate
> >
> > > record the descriptor number for each packet to update available
> > > descriptor counter and used descriptor counter, and rollback when DMA
> > > ring is full.
> > >
> > > Fixes: fe8477ebbd94 ("vhost: support async packed ring dequeue")
> > > Cc: stable@dpdk.org
> > >
> > > Signed-off-by: Cheng Jiang <cheng1.jiang@intel.com>
> > > ---
> > >   lib/vhost/virtio_net.c | 24 +++++++++++++++---------
> > >   1 file changed, 15 insertions(+), 9 deletions(-)
> > >
> > > diff --git a/lib/vhost/virtio_net.c b/lib/vhost/virtio_net.c index
> > > 8f4d0f0502..457ac2e92a 100644
> > > --- a/lib/vhost/virtio_net.c
> > > +++ b/lib/vhost/virtio_net.c
> > > @@ -3548,14 +3548,15 @@ virtio_dev_tx_async_split_compliant(struct
> > virtio_net *dev,
> > >   }
> > >
> > >   static __rte_always_inline void
> > > -vhost_async_shadow_dequeue_single_packed(struct vhost_virtqueue
> > *vq,
> > > uint16_t buf_id)
> > > +vhost_async_shadow_dequeue_single_packed(struct vhost_virtqueue
> > *vq,
> > > +				uint16_t buf_id, uint16_t count)
> > >   {
> > >   	struct vhost_async *async = vq->async;
> > >   	uint16_t idx = async->buffer_idx_packed;
> > >
> > >   	async->buffers_packed[idx].id = buf_id;
> > >   	async->buffers_packed[idx].len = 0;
> > > -	async->buffers_packed[idx].count = 1;
> > > +	async->buffers_packed[idx].count = count;
> > >
> > >   	async->buffer_idx_packed++;
> > >   	if (async->buffer_idx_packed >= vq->size) @@ -3576,6 +3577,8
> @@
> > > virtio_dev_tx_async_single_packed(struct virtio_net *dev,
> > >   	uint16_t nr_vec = 0;
> > >   	uint32_t buf_len;
> > >   	struct buf_vector buf_vec[BUF_VECTOR_MAX];
> > > +	struct vhost_async *async = vq->async;
> > > +	struct async_inflight_info *pkts_info = async->pkts_info;
> > >   	static bool allocerr_warned;
> > >
> > >   	if (unlikely(fill_vec_buf_packed(dev, vq, vq->last_avail_idx,
> > > &desc_count, @@ -3604,8 +3607,12 @@
> > virtio_dev_tx_async_single_packed(struct virtio_net *dev,
> > >   		return -1;
> > >   	}
> > >
> > > +	pkts_info[slot_idx].descs = desc_count;
> > > +
> > >   	/* update async shadow packed ring */
> > > -	vhost_async_shadow_dequeue_single_packed(vq, buf_id);
> > > +	vhost_async_shadow_dequeue_single_packed(vq, buf_id,
> > desc_count);
> > > +
> > > +	vq_inc_last_avail_packed(vq, desc_count);
> > >
> > >   	return err;
> > >   }
> > > @@ -3644,9 +3651,6 @@ virtio_dev_tx_async_packed(struct virtio_net
> > *dev, struct vhost_virtqueue *vq,
> > >   		}
> > >
> > >   		pkts_info[slot_idx].mbuf = pkt;
> > > -
> > > -		vq_inc_last_avail_packed(vq, 1);
> > > -
> > >   	}
> > >
> > >   	n_xfer = vhost_async_dma_transfer(dev, vq, dma_id, vchan_id,
> > > async->pkts_idx, @@ -3657,6 +3661,8 @@
> > virtio_dev_tx_async_packed(struct virtio_net *dev, struct
> vhost_virtqueue
> > *vq,
> > >   	pkt_err = pkt_idx - n_xfer;
> > >
> > >   	if (unlikely(pkt_err)) {
> > > +		uint16_t descs_err = 0;
> > > +
> > >   		pkt_idx -= pkt_err;
> > >
> > >   		/**
> > > @@ -3673,10 +3679,10 @@ virtio_dev_tx_async_packed(struct virtio_net
> > *dev, struct vhost_virtqueue *vq,
> > >   		}
> > >
> > >   		/* recover available ring */
> > > -		if (vq->last_avail_idx >= pkt_err) {
> > > -			vq->last_avail_idx -= pkt_err;
> > > +		if (vq->last_avail_idx >= descs_err) {
> > > +			vq->last_avail_idx -= descs_err;
> > >   		} else {
> > > -			vq->last_avail_idx += vq->size - pkt_err;
> > > +			vq->last_avail_idx += vq->size - descs_err;
> > >   			vq->avail_wrap_counter ^= 1;
> > >   		}
> > >   	}
> >
> > If only the commit message typos need to be fixed, maybe no need to send
> > a new version.

Reviewed-by: Chenbo Xia <chenbo.xia@intel.com>

Will fix above typos when applying

Thanks,
Chenbo

> 
> Sure, thanks a lot!
> Cheng
> 
> >
> > Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>
> >
> > Thanks,
> > Maxime

RE: [PATCH v2 2/2] vhost: fix slot index calculation in async vhost

[Xia, Chenbo]

> -----Original Message-----
> From: Jiang, Cheng1 <cheng1.jiang@intel.com>
> Sent: Tuesday, October 11, 2022 11:08 AM
> To: maxime.coquelin@redhat.com; Xia, Chenbo <chenbo.xia@intel.com>
> Cc: dev@dpdk.org; Hu, Jiayu <jiayu.hu@intel.com>; Ding, Xuan
> <xuan.ding@intel.com>; Ma, WenwuX <wenwux.ma@intel.com>; Wang, YuanX
> <yuanx.wang@intel.com>; Yang, YvonneX <yvonnex.yang@intel.com>; He,
> Xingguang <xingguang.he@intel.com>; Jiang, Cheng1 <cheng1.jiang@intel.com>;
> stable@dpdk.org
> Subject: [PATCH v2 2/2] vhost: fix slot index calculation in async vhost
> 
> When the packet receiving failure and the DMA ring full occur
> simultaneously in the asynchronous vhost, the slot_idx needs to be
> decreased by 1. For packed virtqueue, the slot index should be
> ring_size - 1, if the slot_idx is currently 0, since the ring size is
> not necessarily the power of 2.
> 
> Fixes: 84d5204310d7 ("vhost: support async dequeue for split ring")
> Fixes: fe8477ebbd94 ("vhost: support async packed ring dequeue")
> Cc: stable@dpdk.org
> 
> Signed-off-by: Cheng Jiang <cheng1.jiang@intel.com>
> ---
>  lib/vhost/virtio_net.c | 16 ++++++++++++++--
>  1 file changed, 14 insertions(+), 2 deletions(-)
> 
> diff --git a/lib/vhost/virtio_net.c b/lib/vhost/virtio_net.c
> index 457ac2e92a..efebd063d7 100644
> --- a/lib/vhost/virtio_net.c
> +++ b/lib/vhost/virtio_net.c
> @@ -3457,6 +3457,7 @@ virtio_dev_tx_async_split(struct virtio_net *dev,
> struct vhost_virtqueue *vq,
>  				allocerr_warned = true;
>  			}
>  			dropped = true;
> +			slot_idx--;
>  			break;
>  		}
> 
> @@ -3647,6 +3648,12 @@ virtio_dev_tx_async_packed(struct virtio_net *dev,
> struct vhost_virtqueue *vq,
>  		if (unlikely(virtio_dev_tx_async_single_packed(dev, vq,
> mbuf_pool, pkt,
>  				slot_idx, legacy_ol_flags))) {
>  			rte_pktmbuf_free_bulk(&pkts_prealloc[pkt_idx], count -
> pkt_idx);
> +
> +			if (slot_idx == 0)
> +				slot_idx = vq->size - 1;
> +			else
> +				slot_idx--;
> +
>  			break;
>  		}
> 
> @@ -3674,8 +3681,13 @@ virtio_dev_tx_async_packed(struct virtio_net *dev,
> struct vhost_virtqueue *vq,
>  			async->buffer_idx_packed += vq->size - pkt_err;
> 
>  		while (pkt_err-- > 0) {
> -			rte_pktmbuf_free(pkts_info[slot_idx % vq->size].mbuf);
> -			slot_idx--;
> +			rte_pktmbuf_free(pkts_info[slot_idx].mbuf);
> +			descs_err += pkts_info[slot_idx].descs;
> +
> +			if (slot_idx == 0)
> +				slot_idx = vq->size - 1;
> +			else
> +				slot_idx--;
>  		}
> 
>  		/* recover available ring */
> --
> 2.35.1

Reviewed-by: Chenbo Xia <chenbo.xia@intel.com>