[dpdk-dev] [PATCH 0/4] Use bulk alloc/free in virtio packed

[dpdk-dev] [PATCH 0/4] Use bulk alloc/free in virtio packed

[Balazs Nemeth]

Use the faster bulk versions of alloc and free in virtio packed path.

Balazs Nemeth (4):
  vhost: move allocation of mbuf outside of packet enqueue
  vhost: perform all mbuf allocations in one loop
  vhost: allocate and free packets in bulk
  vhost: remove unnecessary level of indirection

 lib/librte_vhost/virtio_net.c | 56 ++++++++++++++++++++++++-----------
 1 file changed, 39 insertions(+), 17 deletions(-)

--
2.30.2

[dpdk-dev] [PATCH 1/4] vhost: move allocation of mbuf outside of packet enqueue

[Balazs Nemeth]

In preparation for subsequent patches, move mbuf allocation out and
rename virtio_dev_pktmbuf_alloc to virtio_dev_pktmbuf_prep. This
function now receives an already allocated mbuf pointer.

Signed-off-by: Balazs Nemeth <bnemeth@redhat.com>
---
 lib/librte_vhost/virtio_net.c | 54 ++++++++++++++++++++++++++---------
 1 file changed, 40 insertions(+), 14 deletions(-)

diff --git a/lib/librte_vhost/virtio_net.c b/lib/librte_vhost/virtio_net.c
index 7f621fb6d..666e7fdb8 100644
--- a/lib/librte_vhost/virtio_net.c
+++ b/lib/librte_vhost/virtio_net.c
@@ -2166,6 +2166,23 @@ virtio_dev_pktmbuf_alloc(struct virtio_net *dev, struct rte_mempool *mp,
 	return NULL;
 }
 
+static __rte_always_inline int
+virtio_dev_pktmbuf_prep(struct virtio_net *dev, struct rte_mbuf *pkt,
+			 uint32_t data_len)
+{
+	if (rte_pktmbuf_tailroom(pkt) >= data_len)
+		return 0;
+
+	/* attach an external buffer if supported */
+	if (dev->extbuf && !virtio_dev_extbuf_alloc(pkt, data_len))
+		return 0;
+
+	/* check if chained buffers are allowed */
+	if (!dev->linearbuf)
+		return 0;
+	return 1;
+}
+
 static __rte_noinline uint16_t
 virtio_dev_tx_split(struct virtio_net *dev, struct vhost_virtqueue *vq,
 	struct rte_mempool *mbuf_pool, struct rte_mbuf **pkts, uint16_t count)
@@ -2259,7 +2276,6 @@ virtio_dev_tx_split(struct virtio_net *dev, struct vhost_virtqueue *vq,
 static __rte_always_inline int
 vhost_reserve_avail_batch_packed(struct virtio_net *dev,
 				 struct vhost_virtqueue *vq,
-				 struct rte_mempool *mbuf_pool,
 				 struct rte_mbuf **pkts,
 				 uint16_t avail_idx,
 				 uintptr_t *desc_addrs,
@@ -2304,8 +2320,7 @@ vhost_reserve_avail_batch_packed(struct virtio_net *dev,
 	}
 
 	vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
-		pkts[i] = virtio_dev_pktmbuf_alloc(dev, mbuf_pool, lens[i]);
-		if (!pkts[i])
+		if (virtio_dev_pktmbuf_prep(dev, pkts[i], lens[i]))
 			goto free_buf;
 	}
 
@@ -2326,16 +2341,12 @@ vhost_reserve_avail_batch_packed(struct virtio_net *dev,
 	return 0;
 
 free_buf:
-	for (i = 0; i < PACKED_BATCH_SIZE; i++)
-		rte_pktmbuf_free(pkts[i]);
-
 	return -1;
 }
 
 static __rte_always_inline int
 virtio_dev_tx_batch_packed(struct virtio_net *dev,
 			   struct vhost_virtqueue *vq,
-			   struct rte_mempool *mbuf_pool,
 			   struct rte_mbuf **pkts)
 {
 	uint16_t avail_idx = vq->last_avail_idx;
@@ -2345,8 +2356,8 @@ virtio_dev_tx_batch_packed(struct virtio_net *dev,
 	uint16_t ids[PACKED_BATCH_SIZE];
 	uint16_t i;
 
-	if (vhost_reserve_avail_batch_packed(dev, vq, mbuf_pool, pkts,
-					     avail_idx, desc_addrs, ids))
+	if (vhost_reserve_avail_batch_packed(dev, vq, pkts, avail_idx,
+					     desc_addrs, ids))
 		return -1;
 
 	vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE)
@@ -2396,8 +2407,8 @@ vhost_dequeue_single_packed(struct virtio_net *dev,
 					 VHOST_ACCESS_RO) < 0))
 		return -1;
 
-	*pkts = virtio_dev_pktmbuf_alloc(dev, mbuf_pool, buf_len);
-	if (unlikely(*pkts == NULL)) {
+
+	if (unlikely(virtio_dev_pktmbuf_prep(dev, *pkts, buf_len))) {
 		if (!allocerr_warned) {
 			VHOST_LOG_DATA(ERR,
 				"Failed mbuf alloc of size %d from %s on %s.\n",
@@ -2416,7 +2427,6 @@ vhost_dequeue_single_packed(struct virtio_net *dev,
 				dev->ifname);
 			allocerr_warned = true;
 		}
-		rte_pktmbuf_free(*pkts);
 		return -1;
 	}
 
@@ -2459,22 +2469,38 @@ virtio_dev_tx_packed(struct virtio_net *dev,
 {
 	uint32_t pkt_idx = 0;
 	uint32_t remained = count;
+	uint16_t i;
 
 	do {
 		rte_prefetch0(&vq->desc_packed[vq->last_avail_idx]);
 
 		if (remained >= PACKED_BATCH_SIZE) {
-			if (!virtio_dev_tx_batch_packed(dev, vq, mbuf_pool,
+			vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
+				pkts[pkt_idx + i] =
+					rte_pktmbuf_alloc(mbuf_pool);
+			}
+
+			if (!virtio_dev_tx_batch_packed(dev, vq,
 							&pkts[pkt_idx])) {
 				pkt_idx += PACKED_BATCH_SIZE;
 				remained -= PACKED_BATCH_SIZE;
+
 				continue;
+			} else {
+				vhost_for_each_try_unroll(i, 0,
+					PACKED_BATCH_SIZE) {
+					rte_pktmbuf_free(pkts[pkt_idx + i]);
+				}
 			}
 		}
 
+		pkts[pkt_idx] = rte_pktmbuf_alloc(mbuf_pool);
+
 		if (virtio_dev_tx_single_packed(dev, vq, mbuf_pool,
-						&pkts[pkt_idx]))
+						&pkts[pkt_idx])) {
+			rte_pktmbuf_free(pkts[pkt_idx]);
 			break;
+		}
 		pkt_idx++;
 		remained--;
 
-- 
2.30.2

[dpdk-dev] [PATCH v2 1/4] vhost: move allocation of mbuf outside of packet enqueue

[Balazs Nemeth]

In preparation for subsequent patches, move mbuf allocation out and
rename virtio_dev_pktmbuf_alloc to virtio_dev_pktmbuf_prep. This
function now receives an already allocated mbuf pointer.

Signed-off-by: Balazs Nemeth <bnemeth@redhat.com>
---
 lib/librte_vhost/virtio_net.c | 54 ++++++++++++++++++++++++++---------
 1 file changed, 40 insertions(+), 14 deletions(-)

diff --git a/lib/librte_vhost/virtio_net.c b/lib/librte_vhost/virtio_net.c
index 7f621fb6d..666e7fdb8 100644
--- a/lib/librte_vhost/virtio_net.c
+++ b/lib/librte_vhost/virtio_net.c
@@ -2166,6 +2166,23 @@ virtio_dev_pktmbuf_alloc(struct virtio_net *dev, struct rte_mempool *mp,
 	return NULL;
 }
 
+static __rte_always_inline int
+virtio_dev_pktmbuf_prep(struct virtio_net *dev, struct rte_mbuf *pkt,
+			 uint32_t data_len)
+{
+	if (rte_pktmbuf_tailroom(pkt) >= data_len)
+		return 0;
+
+	/* attach an external buffer if supported */
+	if (dev->extbuf && !virtio_dev_extbuf_alloc(pkt, data_len))
+		return 0;
+
+	/* check if chained buffers are allowed */
+	if (!dev->linearbuf)
+		return 0;
+	return 1;
+}
+
 static __rte_noinline uint16_t
 virtio_dev_tx_split(struct virtio_net *dev, struct vhost_virtqueue *vq,
 	struct rte_mempool *mbuf_pool, struct rte_mbuf **pkts, uint16_t count)
@@ -2259,7 +2276,6 @@ virtio_dev_tx_split(struct virtio_net *dev, struct vhost_virtqueue *vq,
 static __rte_always_inline int
 vhost_reserve_avail_batch_packed(struct virtio_net *dev,
 				 struct vhost_virtqueue *vq,
-				 struct rte_mempool *mbuf_pool,
 				 struct rte_mbuf **pkts,
 				 uint16_t avail_idx,
 				 uintptr_t *desc_addrs,
@@ -2304,8 +2320,7 @@ vhost_reserve_avail_batch_packed(struct virtio_net *dev,
 	}
 
 	vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
-		pkts[i] = virtio_dev_pktmbuf_alloc(dev, mbuf_pool, lens[i]);
-		if (!pkts[i])
+		if (virtio_dev_pktmbuf_prep(dev, pkts[i], lens[i]))
 			goto free_buf;
 	}
 
@@ -2326,16 +2341,12 @@ vhost_reserve_avail_batch_packed(struct virtio_net *dev,
 	return 0;
 
 free_buf:
-	for (i = 0; i < PACKED_BATCH_SIZE; i++)
-		rte_pktmbuf_free(pkts[i]);
-
 	return -1;
 }
 
 static __rte_always_inline int
 virtio_dev_tx_batch_packed(struct virtio_net *dev,
 			   struct vhost_virtqueue *vq,
-			   struct rte_mempool *mbuf_pool,
 			   struct rte_mbuf **pkts)
 {
 	uint16_t avail_idx = vq->last_avail_idx;
@@ -2345,8 +2356,8 @@ virtio_dev_tx_batch_packed(struct virtio_net *dev,
 	uint16_t ids[PACKED_BATCH_SIZE];
 	uint16_t i;
 
-	if (vhost_reserve_avail_batch_packed(dev, vq, mbuf_pool, pkts,
-					     avail_idx, desc_addrs, ids))
+	if (vhost_reserve_avail_batch_packed(dev, vq, pkts, avail_idx,
+					     desc_addrs, ids))
 		return -1;
 
 	vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE)
@@ -2396,8 +2407,8 @@ vhost_dequeue_single_packed(struct virtio_net *dev,
 					 VHOST_ACCESS_RO) < 0))
 		return -1;
 
-	*pkts = virtio_dev_pktmbuf_alloc(dev, mbuf_pool, buf_len);
-	if (unlikely(*pkts == NULL)) {
+
+	if (unlikely(virtio_dev_pktmbuf_prep(dev, *pkts, buf_len))) {
 		if (!allocerr_warned) {
 			VHOST_LOG_DATA(ERR,
 				"Failed mbuf alloc of size %d from %s on %s.\n",
@@ -2416,7 +2427,6 @@ vhost_dequeue_single_packed(struct virtio_net *dev,
 				dev->ifname);
 			allocerr_warned = true;
 		}
-		rte_pktmbuf_free(*pkts);
 		return -1;
 	}
 
@@ -2459,22 +2469,38 @@ virtio_dev_tx_packed(struct virtio_net *dev,
 {
 	uint32_t pkt_idx = 0;
 	uint32_t remained = count;
+	uint16_t i;
 
 	do {
 		rte_prefetch0(&vq->desc_packed[vq->last_avail_idx]);
 
 		if (remained >= PACKED_BATCH_SIZE) {
-			if (!virtio_dev_tx_batch_packed(dev, vq, mbuf_pool,
+			vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
+				pkts[pkt_idx + i] =
+					rte_pktmbuf_alloc(mbuf_pool);
+			}
+
+			if (!virtio_dev_tx_batch_packed(dev, vq,
 							&pkts[pkt_idx])) {
 				pkt_idx += PACKED_BATCH_SIZE;
 				remained -= PACKED_BATCH_SIZE;
+
 				continue;
+			} else {
+				vhost_for_each_try_unroll(i, 0,
+					PACKED_BATCH_SIZE) {
+					rte_pktmbuf_free(pkts[pkt_idx + i]);
+				}
 			}
 		}
 
+		pkts[pkt_idx] = rte_pktmbuf_alloc(mbuf_pool);
+
 		if (virtio_dev_tx_single_packed(dev, vq, mbuf_pool,
-						&pkts[pkt_idx]))
+						&pkts[pkt_idx])) {
+			rte_pktmbuf_free(pkts[pkt_idx]);
 			break;
+		}
 		pkt_idx++;
 		remained--;
 
-- 
2.30.2

Re: [dpdk-dev] [PATCH v2 1/4] vhost: move allocation of mbuf outside of packet enqueue

[Maxime Coquelin]

Hi Balazs,

Hint for future revisions, please add a cover letter when multiple
patches, it makes the series handling for the maintainer easier.
Also, please use the MAINTAINERS file to add the other maintainers.

On 4/7/21 12:17 PM, Balazs Nemeth wrote:
> In preparation for subsequent patches, move mbuf allocation out and
> rename virtio_dev_pktmbuf_alloc to virtio_dev_pktmbuf_prep. This
> function now receives an already allocated mbuf pointer.
> 
> Signed-off-by: Balazs Nemeth <bnemeth@redhat.com>
> ---
>  lib/librte_vhost/virtio_net.c | 54 ++++++++++++++++++++++++++---------
>  1 file changed, 40 insertions(+), 14 deletions(-)
> 
> diff --git a/lib/librte_vhost/virtio_net.c b/lib/librte_vhost/virtio_net.c
> index 7f621fb6d..666e7fdb8 100644
> --- a/lib/librte_vhost/virtio_net.c
> +++ b/lib/librte_vhost/virtio_net.c
> @@ -2166,6 +2166,23 @@ virtio_dev_pktmbuf_alloc(struct virtio_net *dev, struct rte_mempool *mp,
>  	return NULL;
>  }
>  
> +static __rte_always_inline int
> +virtio_dev_pktmbuf_prep(struct virtio_net *dev, struct rte_mbuf *pkt,
> +			 uint32_t data_len)
> +{
> +	if (rte_pktmbuf_tailroom(pkt) >= data_len)
> +		return 0;
> +
> +	/* attach an external buffer if supported */
> +	if (dev->extbuf && !virtio_dev_extbuf_alloc(pkt, data_len))
> +		return 0;
> +
> +	/* check if chained buffers are allowed */
> +	if (!dev->linearbuf)
> +		return 0;

Add new line here.

> +	return 1;

Maybe return a negative value for consistency.

> +}
> +
>  static __rte_noinline uint16_t
>  virtio_dev_tx_split(struct virtio_net *dev, struct vhost_virtqueue *vq,
>  	struct rte_mempool *mbuf_pool, struct rte_mbuf **pkts, uint16_t count)
> @@ -2259,7 +2276,6 @@ virtio_dev_tx_split(struct virtio_net *dev, struct vhost_virtqueue *vq,
>  static __rte_always_inline int
>  vhost_reserve_avail_batch_packed(struct virtio_net *dev,
>  				 struct vhost_virtqueue *vq,
> -				 struct rte_mempool *mbuf_pool,
>  				 struct rte_mbuf **pkts,
>  				 uint16_t avail_idx,
>  				 uintptr_t *desc_addrs,
> @@ -2304,8 +2320,7 @@ vhost_reserve_avail_batch_packed(struct virtio_net *dev,
>  	}
>  
>  	vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
> -		pkts[i] = virtio_dev_pktmbuf_alloc(dev, mbuf_pool, lens[i]);
> -		if (!pkts[i])
> +		if (virtio_dev_pktmbuf_prep(dev, pkts[i], lens[i]))
>  			goto free_buf;
>  	}
>  
> @@ -2326,16 +2341,12 @@ vhost_reserve_avail_batch_packed(struct virtio_net *dev,
>  	return 0;
>  
>  free_buf:

It is no more freeing here, so better to rename the label.

> -	for (i = 0; i < PACKED_BATCH_SIZE; i++)
> -		rte_pktmbuf_free(pkts[i]);
> -
>  	return -1;
>  }
>  
>  static __rte_always_inline int
>  virtio_dev_tx_batch_packed(struct virtio_net *dev,
>  			   struct vhost_virtqueue *vq,
> -			   struct rte_mempool *mbuf_pool,
>  			   struct rte_mbuf **pkts)
>  {
>  	uint16_t avail_idx = vq->last_avail_idx;
> @@ -2345,8 +2356,8 @@ virtio_dev_tx_batch_packed(struct virtio_net *dev,
>  	uint16_t ids[PACKED_BATCH_SIZE];
>  	uint16_t i;
>  
> -	if (vhost_reserve_avail_batch_packed(dev, vq, mbuf_pool, pkts,
> -					     avail_idx, desc_addrs, ids))
> +	if (vhost_reserve_avail_batch_packed(dev, vq, pkts, avail_idx,
> +					     desc_addrs, ids))
>  		return -1;
>  
>  	vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE)
> @@ -2396,8 +2407,8 @@ vhost_dequeue_single_packed(struct virtio_net *dev,
>  					 VHOST_ACCESS_RO) < 0))
>  		return -1;
>  
> -	*pkts = virtio_dev_pktmbuf_alloc(dev, mbuf_pool, buf_len);
> -	if (unlikely(*pkts == NULL)) {
> +
> +	if (unlikely(virtio_dev_pktmbuf_prep(dev, *pkts, buf_len))) {
>  		if (!allocerr_warned) {
>  			VHOST_LOG_DATA(ERR,
>  				"Failed mbuf alloc of size %d from %s on %s.\n",
> @@ -2416,7 +2427,6 @@ vhost_dequeue_single_packed(struct virtio_net *dev,
>  				dev->ifname);
>  			allocerr_warned = true;
>  		}
> -		rte_pktmbuf_free(*pkts);
>  		return -1;
>  	}
>  
> @@ -2459,22 +2469,38 @@ virtio_dev_tx_packed(struct virtio_net *dev,
>  {
>  	uint32_t pkt_idx = 0;
>  	uint32_t remained = count;
> +	uint16_t i;
>  
>  	do {
>  		rte_prefetch0(&vq->desc_packed[vq->last_avail_idx]);
>  
>  		if (remained >= PACKED_BATCH_SIZE) {
> -			if (!virtio_dev_tx_batch_packed(dev, vq, mbuf_pool,
> +			vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
> +				pkts[pkt_idx + i] =
> +					rte_pktmbuf_alloc(mbuf_pool);

No check on whether the alloc succeeded?

Also, we recently move to up to 100 chars lines, so maybe it can fit in
a single one here now.

> +			}
> +
> +			if (!virtio_dev_tx_batch_packed(dev, vq,
>  							&pkts[pkt_idx])) {

Ditto

>  				pkt_idx += PACKED_BATCH_SIZE;
>  				remained -= PACKED_BATCH_SIZE;
> +
>  				continue;
> +			} else {
> +				vhost_for_each_try_unroll(i, 0,
> +					PACKED_BATCH_SIZE) {

Same here

> +					rte_pktmbuf_free(pkts[pkt_idx + i]);
> +				}
>  			}
>  		}
>  
> +		pkts[pkt_idx] = rte_pktmbuf_alloc(mbuf_pool);

Here also you may want to ensure the allocation succeeded.

> +
>  		if (virtio_dev_tx_single_packed(dev, vq, mbuf_pool,
> -						&pkts[pkt_idx]))
> +						&pkts[pkt_idx])) {
> +			rte_pktmbuf_free(pkts[pkt_idx]);
>  			break;
> +		}
>  		pkt_idx++;
>  		remained--;
>  
> 

Maxime

[dpdk-dev] [PATCH v3] vhost: allocate and free packets in bulk

[Balazs Nemeth]

Move allocation out further and perform all allocation in bulk. The same
goes for freeing packets. In the process, also rename
virtio_dev_pktmbuf_alloc to virtio_dev_pktmbuf_prep. This
function now receives an already allocated mbuf pointer.

Signed-off-by: Balazs Nemeth <bnemeth@redhat.com>
---
 lib/librte_vhost/virtio_net.c | 58 +++++++++++++++++++++++------------
 1 file changed, 38 insertions(+), 20 deletions(-)

diff --git a/lib/librte_vhost/virtio_net.c b/lib/librte_vhost/virtio_net.c
index ff39878609..d6d5636e0f 100644
--- a/lib/librte_vhost/virtio_net.c
+++ b/lib/librte_vhost/virtio_net.c
@@ -2168,6 +2168,24 @@ virtio_dev_pktmbuf_alloc(struct virtio_net *dev, struct rte_mempool *mp,
 	return NULL;
 }
 
+static __rte_always_inline int
+virtio_dev_pktmbuf_prep(struct virtio_net *dev, struct rte_mbuf *pkt,
+			 uint32_t data_len)
+{
+	if (rte_pktmbuf_tailroom(pkt) >= data_len)
+		return 0;
+
+	/* attach an external buffer if supported */
+	if (dev->extbuf && !virtio_dev_extbuf_alloc(pkt, data_len))
+		return 0;
+
+	/* check if chained buffers are allowed */
+	if (!dev->linearbuf)
+		return 0;
+
+	return -1;
+}
+
 static __rte_noinline uint16_t
 virtio_dev_tx_split(struct virtio_net *dev, struct vhost_virtqueue *vq,
 	struct rte_mempool *mbuf_pool, struct rte_mbuf **pkts, uint16_t count)
@@ -2261,7 +2279,6 @@ virtio_dev_tx_split(struct virtio_net *dev, struct vhost_virtqueue *vq,
 static __rte_always_inline int
 vhost_reserve_avail_batch_packed(struct virtio_net *dev,
 				 struct vhost_virtqueue *vq,
-				 struct rte_mempool *mbuf_pool,
 				 struct rte_mbuf **pkts,
 				 uint16_t avail_idx,
 				 uintptr_t *desc_addrs,
@@ -2306,9 +2323,8 @@ vhost_reserve_avail_batch_packed(struct virtio_net *dev,
 	}
 
 	vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
-		pkts[i] = virtio_dev_pktmbuf_alloc(dev, mbuf_pool, lens[i]);
-		if (!pkts[i])
-			goto free_buf;
+		if (virtio_dev_pktmbuf_prep(dev, pkts[i], lens[i]))
+			goto err;
 	}
 
 	vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE)
@@ -2316,7 +2332,7 @@ vhost_reserve_avail_batch_packed(struct virtio_net *dev,
 
 	vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
 		if (unlikely(buf_lens[i] < (lens[i] - buf_offset)))
-			goto free_buf;
+			goto err;
 	}
 
 	vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
@@ -2327,17 +2343,13 @@ vhost_reserve_avail_batch_packed(struct virtio_net *dev,
 
 	return 0;
 
-free_buf:
-	for (i = 0; i < PACKED_BATCH_SIZE; i++)
-		rte_pktmbuf_free(pkts[i]);
-
+err:
 	return -1;
 }
 
 static __rte_always_inline int
 virtio_dev_tx_batch_packed(struct virtio_net *dev,
 			   struct vhost_virtqueue *vq,
-			   struct rte_mempool *mbuf_pool,
 			   struct rte_mbuf **pkts)
 {
 	uint16_t avail_idx = vq->last_avail_idx;
@@ -2347,8 +2359,8 @@ virtio_dev_tx_batch_packed(struct virtio_net *dev,
 	uint16_t ids[PACKED_BATCH_SIZE];
 	uint16_t i;
 
-	if (vhost_reserve_avail_batch_packed(dev, vq, mbuf_pool, pkts,
-					     avail_idx, desc_addrs, ids))
+	if (vhost_reserve_avail_batch_packed(dev, vq, pkts, avail_idx,
+					     desc_addrs, ids))
 		return -1;
 
 	vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE)
@@ -2381,7 +2393,7 @@ static __rte_always_inline int
 vhost_dequeue_single_packed(struct virtio_net *dev,
 			    struct vhost_virtqueue *vq,
 			    struct rte_mempool *mbuf_pool,
-			    struct rte_mbuf **pkts,
+			    struct rte_mbuf *pkts,
 			    uint16_t *buf_id,
 			    uint16_t *desc_count)
 {
@@ -2398,8 +2410,8 @@ vhost_dequeue_single_packed(struct virtio_net *dev,
 					 VHOST_ACCESS_RO) < 0))
 		return -1;
 
-	*pkts = virtio_dev_pktmbuf_alloc(dev, mbuf_pool, buf_len);
-	if (unlikely(*pkts == NULL)) {
+
+	if (unlikely(virtio_dev_pktmbuf_prep(dev, pkts, buf_len))) {
 		if (!allocerr_warned) {
 			VHOST_LOG_DATA(ERR,
 				"Failed mbuf alloc of size %d from %s on %s.\n",
@@ -2409,7 +2421,7 @@ vhost_dequeue_single_packed(struct virtio_net *dev,
 		return -1;
 	}
 
-	err = copy_desc_to_mbuf(dev, vq, buf_vec, nr_vec, *pkts,
+	err = copy_desc_to_mbuf(dev, vq, buf_vec, nr_vec, pkts,
 				mbuf_pool);
 	if (unlikely(err)) {
 		if (!allocerr_warned) {
@@ -2418,7 +2430,6 @@ vhost_dequeue_single_packed(struct virtio_net *dev,
 				dev->ifname);
 			allocerr_warned = true;
 		}
-		rte_pktmbuf_free(*pkts);
 		return -1;
 	}
 
@@ -2429,7 +2440,7 @@ static __rte_always_inline int
 virtio_dev_tx_single_packed(struct virtio_net *dev,
 			    struct vhost_virtqueue *vq,
 			    struct rte_mempool *mbuf_pool,
-			    struct rte_mbuf **pkts)
+			    struct rte_mbuf *pkts)
 {
 
 	uint16_t buf_id, desc_count = 0;
@@ -2462,26 +2473,33 @@ virtio_dev_tx_packed(struct virtio_net *dev,
 	uint32_t pkt_idx = 0;
 	uint32_t remained = count;
 
+	if (rte_pktmbuf_alloc_bulk(mbuf_pool, pkts, count))
+		return 0;
+
 	do {
 		rte_prefetch0(&vq->desc_packed[vq->last_avail_idx]);
 
 		if (remained >= PACKED_BATCH_SIZE) {
-			if (!virtio_dev_tx_batch_packed(dev, vq, mbuf_pool,
+			if (!virtio_dev_tx_batch_packed(dev, vq,
 							&pkts[pkt_idx])) {
 				pkt_idx += PACKED_BATCH_SIZE;
 				remained -= PACKED_BATCH_SIZE;
+
 				continue;
 			}
 		}
 
 		if (virtio_dev_tx_single_packed(dev, vq, mbuf_pool,
-						&pkts[pkt_idx]))
+						pkts[pkt_idx]))
 			break;
 		pkt_idx++;
 		remained--;
 
 	} while (remained);
 
+	if (pkt_idx != count)
+		rte_pktmbuf_free_bulk(&pkts[pkt_idx], count - pkt_idx);
+
 	if (vq->shadow_used_idx) {
 		do_data_copy_dequeue(vq);
 
-- 
2.30.2

Re: [dpdk-dev] [PATCH v3] vhost: allocate and free packets in bulk

[Maxime Coquelin]

On 4/16/21 10:18 AM, Balazs Nemeth wrote:
> Move allocation out further and perform all allocation in bulk. The same
> goes for freeing packets. In the process, also rename
> virtio_dev_pktmbuf_alloc to virtio_dev_pktmbuf_prep. This
> function now receives an already allocated mbuf pointer.
> 
> Signed-off-by: Balazs Nemeth <bnemeth@redhat.com>
> ---
>  lib/librte_vhost/virtio_net.c | 58 +++++++++++++++++++++++------------
>  1 file changed, 38 insertions(+), 20 deletions(-)
> 


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

Thanks,
Maxime

Re: [dpdk-dev] [PATCH v3] vhost: allocate and free packets in bulk

[David Marchand]

On Fri, Apr 16, 2021 at 10:18 AM Balazs Nemeth <bnemeth@redhat.com> wrote:
>
> Move allocation out further and perform all allocation in bulk. The same
> goes for freeing packets. In the process, also rename
> virtio_dev_pktmbuf_alloc to virtio_dev_pktmbuf_prep. This
> function now receives an already allocated mbuf pointer.
>
> Signed-off-by: Balazs Nemeth <bnemeth@redhat.com>

The title should indicate we are only touching the tx packed path.

What about tx split?
If it is too complex to rework, this can wait.


> ---
>  lib/librte_vhost/virtio_net.c | 58 +++++++++++++++++++++++------------
>  1 file changed, 38 insertions(+), 20 deletions(-)
>
> diff --git a/lib/librte_vhost/virtio_net.c b/lib/librte_vhost/virtio_net.c
> index ff39878609..d6d5636e0f 100644
> --- a/lib/librte_vhost/virtio_net.c
> +++ b/lib/librte_vhost/virtio_net.c
> @@ -2168,6 +2168,24 @@ virtio_dev_pktmbuf_alloc(struct virtio_net *dev, struct rte_mempool *mp,
>         return NULL;
>  }
>
> +static __rte_always_inline int
> +virtio_dev_pktmbuf_prep(struct virtio_net *dev, struct rte_mbuf *pkt,
> +                        uint32_t data_len)
> +{
> +       if (rte_pktmbuf_tailroom(pkt) >= data_len)
> +               return 0;
> +
> +       /* attach an external buffer if supported */
> +       if (dev->extbuf && !virtio_dev_extbuf_alloc(pkt, data_len))
> +               return 0;
> +
> +       /* check if chained buffers are allowed */
> +       if (!dev->linearbuf)
> +               return 0;
> +
> +       return -1;
> +}
> +

If virtio_dev_pktmbuf_alloc() uses this new helper, we avoid
duplicating the logic.


>  static __rte_noinline uint16_t
>  virtio_dev_tx_split(struct virtio_net *dev, struct vhost_virtqueue *vq,
>         struct rte_mempool *mbuf_pool, struct rte_mbuf **pkts, uint16_t count)

[snip]

> @@ -2429,7 +2440,7 @@ static __rte_always_inline int
>  virtio_dev_tx_single_packed(struct virtio_net *dev,
>                             struct vhost_virtqueue *vq,
>                             struct rte_mempool *mbuf_pool,
> -                           struct rte_mbuf **pkts)
> +                           struct rte_mbuf *pkts)
>  {
>
>         uint16_t buf_id, desc_count = 0;
> @@ -2462,26 +2473,33 @@ virtio_dev_tx_packed(struct virtio_net *dev,
>         uint32_t pkt_idx = 0;
>         uint32_t remained = count;
>
> +       if (rte_pktmbuf_alloc_bulk(mbuf_pool, pkts, count))
> +               return 0;
> +
>         do {
>                 rte_prefetch0(&vq->desc_packed[vq->last_avail_idx]);
>
>                 if (remained >= PACKED_BATCH_SIZE) {
> -                       if (!virtio_dev_tx_batch_packed(dev, vq, mbuf_pool,
> +                       if (!virtio_dev_tx_batch_packed(dev, vq,
>                                                         &pkts[pkt_idx])) {
>                                 pkt_idx += PACKED_BATCH_SIZE;
>                                 remained -= PACKED_BATCH_SIZE;
> +

No need for the extra line.


>                                 continue;
>                         }
>                 }
>
>                 if (virtio_dev_tx_single_packed(dev, vq, mbuf_pool,
> -                                               &pkts[pkt_idx]))
> +                                               pkts[pkt_idx]))
>                         break;
>                 pkt_idx++;
>                 remained--;
>
>         } while (remained);
>
> +       if (pkt_idx != count)
> +               rte_pktmbuf_free_bulk(&pkts[pkt_idx], count - pkt_idx);
> +
>         if (vq->shadow_used_idx) {
>                 do_data_copy_dequeue(vq);
>

With those comments addressed,
Reviewed-by: David Marchand <david.marchand@redhat.com>

Thanks Balazs!


-- 
David Marchand

Re: [dpdk-dev] [PATCH v3] vhost: allocate and free packets in bulk

[Balazs Nemeth]

Hi David,

I was also thinking about using the same idea for tx split so that
virtio_dev_pktmbuf_alloc can be removed completely. I don't have those
patches yet. However, I can make virtio_dev_pktmbuf_alloc use
virtio_dev_pktmbuf_prep for this patch that addresses the packed
version and submit other patches for tx split later. Would that work for
now?

Regards,
Balazs

On Fri, Apr 16, 2021 at 11:05 AM David Marchand <david.marchand@redhat.com>
wrote:

> On Fri, Apr 16, 2021 at 10:18 AM Balazs Nemeth <bnemeth@redhat.com> wrote:
> >
> > Move allocation out further and perform all allocation in bulk. The same
> > goes for freeing packets. In the process, also rename
> > virtio_dev_pktmbuf_alloc to virtio_dev_pktmbuf_prep. This
> > function now receives an already allocated mbuf pointer.
> >
> > Signed-off-by: Balazs Nemeth <bnemeth@redhat.com>
>
> The title should indicate we are only touching the tx packed path.
>
> What about tx split?
> If it is too complex to rework, this can wait.
>
>
> > ---
> >  lib/librte_vhost/virtio_net.c | 58 +++++++++++++++++++++++------------
> >  1 file changed, 38 insertions(+), 20 deletions(-)
> >
> > diff --git a/lib/librte_vhost/virtio_net.c
> b/lib/librte_vhost/virtio_net.c
> > index ff39878609..d6d5636e0f 100644
> > --- a/lib/librte_vhost/virtio_net.c
> > +++ b/lib/librte_vhost/virtio_net.c
> > @@ -2168,6 +2168,24 @@ virtio_dev_pktmbuf_alloc(struct virtio_net *dev,
> struct rte_mempool *mp,
> >         return NULL;
> >  }
> >
> > +static __rte_always_inline int
> > +virtio_dev_pktmbuf_prep(struct virtio_net *dev, struct rte_mbuf *pkt,
> > +                        uint32_t data_len)
> > +{
> > +       if (rte_pktmbuf_tailroom(pkt) >= data_len)
> > +               return 0;
> > +
> > +       /* attach an external buffer if supported */
> > +       if (dev->extbuf && !virtio_dev_extbuf_alloc(pkt, data_len))
> > +               return 0;
> > +
> > +       /* check if chained buffers are allowed */
> > +       if (!dev->linearbuf)
> > +               return 0;
> > +
> > +       return -1;
> > +}
> > +
>
> If virtio_dev_pktmbuf_alloc() uses this new helper, we avoid
> duplicating the logic.
>
>
> >  static __rte_noinline uint16_t
> >  virtio_dev_tx_split(struct virtio_net *dev, struct vhost_virtqueue *vq,
> >         struct rte_mempool *mbuf_pool, struct rte_mbuf **pkts, uint16_t
> count)
>
> [snip]
>
> > @@ -2429,7 +2440,7 @@ static __rte_always_inline int
> >  virtio_dev_tx_single_packed(struct virtio_net *dev,
> >                             struct vhost_virtqueue *vq,
> >                             struct rte_mempool *mbuf_pool,
> > -                           struct rte_mbuf **pkts)
> > +                           struct rte_mbuf *pkts)
> >  {
> >
> >         uint16_t buf_id, desc_count = 0;
> > @@ -2462,26 +2473,33 @@ virtio_dev_tx_packed(struct virtio_net *dev,
> >         uint32_t pkt_idx = 0;
> >         uint32_t remained = count;
> >
> > +       if (rte_pktmbuf_alloc_bulk(mbuf_pool, pkts, count))
> > +               return 0;
> > +
> >         do {
> >                 rte_prefetch0(&vq->desc_packed[vq->last_avail_idx]);
> >
> >                 if (remained >= PACKED_BATCH_SIZE) {
> > -                       if (!virtio_dev_tx_batch_packed(dev, vq,
> mbuf_pool,
> > +                       if (!virtio_dev_tx_batch_packed(dev, vq,
> >                                                         &pkts[pkt_idx]))
> {
> >                                 pkt_idx += PACKED_BATCH_SIZE;
> >                                 remained -= PACKED_BATCH_SIZE;
> > +
>
> No need for the extra line.
>
>
> >                                 continue;
> >                         }
> >                 }
> >
> >                 if (virtio_dev_tx_single_packed(dev, vq, mbuf_pool,
> > -                                               &pkts[pkt_idx]))
> > +                                               pkts[pkt_idx]))
> >                         break;
> >                 pkt_idx++;
> >                 remained--;
> >
> >         } while (remained);
> >
> > +       if (pkt_idx != count)
> > +               rte_pktmbuf_free_bulk(&pkts[pkt_idx], count - pkt_idx);
> > +
> >         if (vq->shadow_used_idx) {
> >                 do_data_copy_dequeue(vq);
> >
>
> With those comments addressed,
> Reviewed-by: David Marchand <david.marchand@redhat.com>
>
> Thanks Balazs!
>
>
> --
> David Marchand
>
>

Re: [dpdk-dev] [PATCH v3] vhost: allocate and free packets in bulk

[Maxime Coquelin]

Hi Balazs,

On 4/16/21 11:12 AM, Balazs Nemeth wrote:
> Hi David,
> 
> I was also thinking about using the same idea for tx split so that
> virtio_dev_pktmbuf_alloc can be removed completely. I don't have those
> patches yet. However, I can make virtio_dev_pktmbuf_alloc use
> virtio_dev_pktmbuf_prep for this patch that addresses the packed
> version and submit other patches for tx split later. Would that work for
> now?

I think so.
That would be great to have the same for split ring, but more rework may
be necessary than for packed ring. So I'm fine if the split ring part is
done after this release.

Thanks,
Maxime
> Regards,
> Balazs 
> 
> On Fri, Apr 16, 2021 at 11:05 AM David Marchand
> <david.marchand@redhat.com <mailto:david.marchand@redhat.com>> wrote:
> 
>     On Fri, Apr 16, 2021 at 10:18 AM Balazs Nemeth <bnemeth@redhat.com
>     <mailto:bnemeth@redhat.com>> wrote:
>     >
>     > Move allocation out further and perform all allocation in bulk.
>     The same
>     > goes for freeing packets. In the process, also rename
>     > virtio_dev_pktmbuf_alloc to virtio_dev_pktmbuf_prep. This
>     > function now receives an already allocated mbuf pointer.
>     >
>     > Signed-off-by: Balazs Nemeth <bnemeth@redhat.com
>     <mailto:bnemeth@redhat.com>>
> 
>     The title should indicate we are only touching the tx packed path.
> 
>     What about tx split?
>     If it is too complex to rework, this can wait.
> 
> 
>     > ---
>     >  lib/librte_vhost/virtio_net.c | 58
>     +++++++++++++++++++++++------------
>     >  1 file changed, 38 insertions(+), 20 deletions(-)
>     >
>     > diff --git a/lib/librte_vhost/virtio_net.c
>     b/lib/librte_vhost/virtio_net.c
>     > index ff39878609..d6d5636e0f 100644
>     > --- a/lib/librte_vhost/virtio_net.c
>     > +++ b/lib/librte_vhost/virtio_net.c
>     > @@ -2168,6 +2168,24 @@ virtio_dev_pktmbuf_alloc(struct virtio_net
>     *dev, struct rte_mempool *mp,
>     >         return NULL;
>     >  }
>     >
>     > +static __rte_always_inline int
>     > +virtio_dev_pktmbuf_prep(struct virtio_net *dev, struct rte_mbuf *pkt,
>     > +                        uint32_t data_len)
>     > +{
>     > +       if (rte_pktmbuf_tailroom(pkt) >= data_len)
>     > +               return 0;
>     > +
>     > +       /* attach an external buffer if supported */
>     > +       if (dev->extbuf && !virtio_dev_extbuf_alloc(pkt, data_len))
>     > +               return 0;
>     > +
>     > +       /* check if chained buffers are allowed */
>     > +       if (!dev->linearbuf)
>     > +               return 0;
>     > +
>     > +       return -1;
>     > +}
>     > +
> 
>     If virtio_dev_pktmbuf_alloc() uses this new helper, we avoid
>     duplicating the logic.
> 
> 
>     >  static __rte_noinline uint16_t
>     >  virtio_dev_tx_split(struct virtio_net *dev, struct
>     vhost_virtqueue *vq,
>     >         struct rte_mempool *mbuf_pool, struct rte_mbuf **pkts,
>     uint16_t count)
> 
>     [snip]
> 
>     > @@ -2429,7 +2440,7 @@ static __rte_always_inline int
>     >  virtio_dev_tx_single_packed(struct virtio_net *dev,
>     >                             struct vhost_virtqueue *vq,
>     >                             struct rte_mempool *mbuf_pool,
>     > -                           struct rte_mbuf **pkts)
>     > +                           struct rte_mbuf *pkts)
>     >  {
>     >
>     >         uint16_t buf_id, desc_count = 0;
>     > @@ -2462,26 +2473,33 @@ virtio_dev_tx_packed(struct virtio_net *dev,
>     >         uint32_t pkt_idx = 0;
>     >         uint32_t remained = count;
>     >
>     > +       if (rte_pktmbuf_alloc_bulk(mbuf_pool, pkts, count))
>     > +               return 0;
>     > +
>     >         do {
>     >                 rte_prefetch0(&vq->desc_packed[vq->last_avail_idx]);
>     >
>     >                 if (remained >= PACKED_BATCH_SIZE) {
>     > -                       if (!virtio_dev_tx_batch_packed(dev, vq,
>     mbuf_pool,
>     > +                       if (!virtio_dev_tx_batch_packed(dev, vq,
>     >                                                       
>      &pkts[pkt_idx])) {
>     >                                 pkt_idx += PACKED_BATCH_SIZE;
>     >                                 remained -= PACKED_BATCH_SIZE;
>     > +
> 
>     No need for the extra line.
> 
> 
>     >                                 continue;
>     >                         }
>     >                 }
>     >
>     >                 if (virtio_dev_tx_single_packed(dev, vq, mbuf_pool,
>     > -                                               &pkts[pkt_idx]))
>     > +                                               pkts[pkt_idx]))
>     >                         break;
>     >                 pkt_idx++;
>     >                 remained--;
>     >
>     >         } while (remained);
>     >
>     > +       if (pkt_idx != count)
>     > +               rte_pktmbuf_free_bulk(&pkts[pkt_idx], count -
>     pkt_idx);
>     > +
>     >         if (vq->shadow_used_idx) {
>     >                 do_data_copy_dequeue(vq);
>     >
> 
>     With those comments addressed,
>     Reviewed-by: David Marchand <david.marchand@redhat.com
>     <mailto:david.marchand@redhat.com>>
> 
>     Thanks Balazs!
> 
> 
>     -- 
>     David Marchand
> 

Re: [dpdk-dev] [PATCH v3] vhost: allocate and free packets in bulk

[David Marchand]

On Fri, Apr 16, 2021 at 11:12 AM Balazs Nemeth <bnemeth@redhat.com> wrote:
> I was also thinking about using the same idea for tx split so that virtio_dev_pktmbuf_alloc can be removed completely. I don't have those patches yet. However, I can make virtio_dev_pktmbuf_alloc use virtio_dev_pktmbuf_prep for this patch that addresses the packed version and submit other patches for tx split later. Would that work for now?

Ok for me.

And revisit the tx split part in 21.08 :-).



-- 
David Marchand

[dpdk-dev] [PATCH v4] vhost: allocate and free packets in bulk

[Balazs Nemeth]

Move allocation out further and perform all allocation in bulk. The same
goes for freeing packets. In the process, also introduce
virtio_dev_pktmbuf_prep and make virtio_dev_pktmbuf_alloc use that.

Signed-off-by: Balazs Nemeth <bnemeth@redhat.com>
---
 lib/librte_vhost/virtio_net.c | 80 +++++++++++++++++++----------------
 1 file changed, 44 insertions(+), 36 deletions(-)

diff --git a/lib/librte_vhost/virtio_net.c b/lib/librte_vhost/virtio_net.c
index ff39878609..95d2454de0 100644
--- a/lib/librte_vhost/virtio_net.c
+++ b/lib/librte_vhost/virtio_net.c
@@ -2134,6 +2134,24 @@ virtio_dev_extbuf_alloc(struct rte_mbuf *pkt, uint32_t size)
 	return 0;
 }
 
+static __rte_always_inline int
+virtio_dev_pktmbuf_prep(struct virtio_net *dev, struct rte_mbuf *pkt,
+			 uint32_t data_len)
+{
+	if (rte_pktmbuf_tailroom(pkt) >= data_len)
+		return 0;
+
+	/* attach an external buffer if supported */
+	if (dev->extbuf && !virtio_dev_extbuf_alloc(pkt, data_len))
+		return 0;
+
+	/* check if chained buffers are allowed */
+	if (!dev->linearbuf)
+		return 0;
+
+	return -1;
+}
+
 /*
  * Allocate a host supported pktmbuf.
  */
@@ -2149,23 +2167,15 @@ virtio_dev_pktmbuf_alloc(struct virtio_net *dev, struct rte_mempool *mp,
 		return NULL;
 	}
 
-	if (rte_pktmbuf_tailroom(pkt) >= data_len)
-		return pkt;
+	if (virtio_dev_pktmbuf_prep(dev, pkt, data_len)) {
+		/* Data doesn't fit into the buffer and the host supports
+		 * only linear buffers
+		 */
+		rte_pktmbuf_free(pkt);
+		return NULL;
+	}
 
-	/* attach an external buffer if supported */
-	if (dev->extbuf && !virtio_dev_extbuf_alloc(pkt, data_len))
-		return pkt;
-
-	/* check if chained buffers are allowed */
-	if (!dev->linearbuf)
-		return pkt;
-
-	/* Data doesn't fit into the buffer and the host supports
-	 * only linear buffers
-	 */
-	rte_pktmbuf_free(pkt);
-
-	return NULL;
+	return pkt
 }
 
 static __rte_noinline uint16_t
@@ -2261,7 +2271,6 @@ virtio_dev_tx_split(struct virtio_net *dev, struct vhost_virtqueue *vq,
 static __rte_always_inline int
 vhost_reserve_avail_batch_packed(struct virtio_net *dev,
 				 struct vhost_virtqueue *vq,
-				 struct rte_mempool *mbuf_pool,
 				 struct rte_mbuf **pkts,
 				 uint16_t avail_idx,
 				 uintptr_t *desc_addrs,
@@ -2306,9 +2315,8 @@ vhost_reserve_avail_batch_packed(struct virtio_net *dev,
 	}
 
 	vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
-		pkts[i] = virtio_dev_pktmbuf_alloc(dev, mbuf_pool, lens[i]);
-		if (!pkts[i])
-			goto free_buf;
+		if (virtio_dev_pktmbuf_prep(dev, pkts[i], lens[i]))
+			goto err;
 	}
 
 	vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE)
@@ -2316,7 +2324,7 @@ vhost_reserve_avail_batch_packed(struct virtio_net *dev,
 
 	vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
 		if (unlikely(buf_lens[i] < (lens[i] - buf_offset)))
-			goto free_buf;
+			goto err;
 	}
 
 	vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
@@ -2327,17 +2335,13 @@ vhost_reserve_avail_batch_packed(struct virtio_net *dev,
 
 	return 0;
 
-free_buf:
-	for (i = 0; i < PACKED_BATCH_SIZE; i++)
-		rte_pktmbuf_free(pkts[i]);
-
+err:
 	return -1;
 }
 
 static __rte_always_inline int
 virtio_dev_tx_batch_packed(struct virtio_net *dev,
 			   struct vhost_virtqueue *vq,
-			   struct rte_mempool *mbuf_pool,
 			   struct rte_mbuf **pkts)
 {
 	uint16_t avail_idx = vq->last_avail_idx;
@@ -2347,8 +2351,8 @@ virtio_dev_tx_batch_packed(struct virtio_net *dev,
 	uint16_t ids[PACKED_BATCH_SIZE];
 	uint16_t i;
 
-	if (vhost_reserve_avail_batch_packed(dev, vq, mbuf_pool, pkts,
-					     avail_idx, desc_addrs, ids))
+	if (vhost_reserve_avail_batch_packed(dev, vq, pkts, avail_idx,
+					     desc_addrs, ids))
 		return -1;
 
 	vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE)
@@ -2381,7 +2385,7 @@ static __rte_always_inline int
 vhost_dequeue_single_packed(struct virtio_net *dev,
 			    struct vhost_virtqueue *vq,
 			    struct rte_mempool *mbuf_pool,
-			    struct rte_mbuf **pkts,
+			    struct rte_mbuf *pkts,
 			    uint16_t *buf_id,
 			    uint16_t *desc_count)
 {
@@ -2398,8 +2402,7 @@ vhost_dequeue_single_packed(struct virtio_net *dev,
 					 VHOST_ACCESS_RO) < 0))
 		return -1;
 
-	*pkts = virtio_dev_pktmbuf_alloc(dev, mbuf_pool, buf_len);
-	if (unlikely(*pkts == NULL)) {
+	if (unlikely(virtio_dev_pktmbuf_prep(dev, pkts, buf_len))) {
 		if (!allocerr_warned) {
 			VHOST_LOG_DATA(ERR,
 				"Failed mbuf alloc of size %d from %s on %s.\n",
@@ -2409,7 +2412,7 @@ vhost_dequeue_single_packed(struct virtio_net *dev,
 		return -1;
 	}
 
-	err = copy_desc_to_mbuf(dev, vq, buf_vec, nr_vec, *pkts,
+	err = copy_desc_to_mbuf(dev, vq, buf_vec, nr_vec, pkts,
 				mbuf_pool);
 	if (unlikely(err)) {
 		if (!allocerr_warned) {
@@ -2418,7 +2421,6 @@ vhost_dequeue_single_packed(struct virtio_net *dev,
 				dev->ifname);
 			allocerr_warned = true;
 		}
-		rte_pktmbuf_free(*pkts);
 		return -1;
 	}
 
@@ -2429,7 +2431,7 @@ static __rte_always_inline int
 virtio_dev_tx_single_packed(struct virtio_net *dev,
 			    struct vhost_virtqueue *vq,
 			    struct rte_mempool *mbuf_pool,
-			    struct rte_mbuf **pkts)
+			    struct rte_mbuf *pkts)
 {
 
 	uint16_t buf_id, desc_count = 0;
@@ -2462,11 +2464,14 @@ virtio_dev_tx_packed(struct virtio_net *dev,
 	uint32_t pkt_idx = 0;
 	uint32_t remained = count;
 
+	if (rte_pktmbuf_alloc_bulk(mbuf_pool, pkts, count))
+		return 0;
+
 	do {
 		rte_prefetch0(&vq->desc_packed[vq->last_avail_idx]);
 
 		if (remained >= PACKED_BATCH_SIZE) {
-			if (!virtio_dev_tx_batch_packed(dev, vq, mbuf_pool,
+			if (!virtio_dev_tx_batch_packed(dev, vq,
 							&pkts[pkt_idx])) {
 				pkt_idx += PACKED_BATCH_SIZE;
 				remained -= PACKED_BATCH_SIZE;
@@ -2475,13 +2480,16 @@ virtio_dev_tx_packed(struct virtio_net *dev,
 		}
 
 		if (virtio_dev_tx_single_packed(dev, vq, mbuf_pool,
-						&pkts[pkt_idx]))
+						pkts[pkt_idx]))
 			break;
 		pkt_idx++;
 		remained--;
 
 	} while (remained);
 
+	if (pkt_idx != count)
+		rte_pktmbuf_free_bulk(&pkts[pkt_idx], count - pkt_idx);
+
 	if (vq->shadow_used_idx) {
 		do_data_copy_dequeue(vq);
 
-- 
2.30.2

[dpdk-dev] [PATCH v5] vhost: allocate and free packets in bulk in Tx packed

[Balazs Nemeth]

Move allocation out further and perform all allocation in bulk. The same
goes for freeing packets. In the process, also introduce
virtio_dev_pktmbuf_prep and make virtio_dev_pktmbuf_alloc use that.

Signed-off-by: Balazs Nemeth <bnemeth@redhat.com>
---
 lib/librte_vhost/virtio_net.c | 80 +++++++++++++++++++----------------
 1 file changed, 44 insertions(+), 36 deletions(-)

diff --git a/lib/librte_vhost/virtio_net.c b/lib/librte_vhost/virtio_net.c
index ff39878609..77a00c9499 100644
--- a/lib/librte_vhost/virtio_net.c
+++ b/lib/librte_vhost/virtio_net.c
@@ -2134,6 +2134,24 @@ virtio_dev_extbuf_alloc(struct rte_mbuf *pkt, uint32_t size)
 	return 0;
 }
 
+static __rte_always_inline int
+virtio_dev_pktmbuf_prep(struct virtio_net *dev, struct rte_mbuf *pkt,
+			 uint32_t data_len)
+{
+	if (rte_pktmbuf_tailroom(pkt) >= data_len)
+		return 0;
+
+	/* attach an external buffer if supported */
+	if (dev->extbuf && !virtio_dev_extbuf_alloc(pkt, data_len))
+		return 0;
+
+	/* check if chained buffers are allowed */
+	if (!dev->linearbuf)
+		return 0;
+
+	return -1;
+}
+
 /*
  * Allocate a host supported pktmbuf.
  */
@@ -2149,23 +2167,15 @@ virtio_dev_pktmbuf_alloc(struct virtio_net *dev, struct rte_mempool *mp,
 		return NULL;
 	}
 
-	if (rte_pktmbuf_tailroom(pkt) >= data_len)
-		return pkt;
+	if (virtio_dev_pktmbuf_prep(dev, pkt, data_len)) {
+		/* Data doesn't fit into the buffer and the host supports
+		 * only linear buffers
+		 */
+		rte_pktmbuf_free(pkt);
+		return NULL;
+	}
 
-	/* attach an external buffer if supported */
-	if (dev->extbuf && !virtio_dev_extbuf_alloc(pkt, data_len))
-		return pkt;
-
-	/* check if chained buffers are allowed */
-	if (!dev->linearbuf)
-		return pkt;
-
-	/* Data doesn't fit into the buffer and the host supports
-	 * only linear buffers
-	 */
-	rte_pktmbuf_free(pkt);
-
-	return NULL;
+	return pkt;
 }
 
 static __rte_noinline uint16_t
@@ -2261,7 +2271,6 @@ virtio_dev_tx_split(struct virtio_net *dev, struct vhost_virtqueue *vq,
 static __rte_always_inline int
 vhost_reserve_avail_batch_packed(struct virtio_net *dev,
 				 struct vhost_virtqueue *vq,
-				 struct rte_mempool *mbuf_pool,
 				 struct rte_mbuf **pkts,
 				 uint16_t avail_idx,
 				 uintptr_t *desc_addrs,
@@ -2306,9 +2315,8 @@ vhost_reserve_avail_batch_packed(struct virtio_net *dev,
 	}
 
 	vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
-		pkts[i] = virtio_dev_pktmbuf_alloc(dev, mbuf_pool, lens[i]);
-		if (!pkts[i])
-			goto free_buf;
+		if (virtio_dev_pktmbuf_prep(dev, pkts[i], lens[i]))
+			goto err;
 	}
 
 	vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE)
@@ -2316,7 +2324,7 @@ vhost_reserve_avail_batch_packed(struct virtio_net *dev,
 
 	vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
 		if (unlikely(buf_lens[i] < (lens[i] - buf_offset)))
-			goto free_buf;
+			goto err;
 	}
 
 	vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
@@ -2327,17 +2335,13 @@ vhost_reserve_avail_batch_packed(struct virtio_net *dev,
 
 	return 0;
 
-free_buf:
-	for (i = 0; i < PACKED_BATCH_SIZE; i++)
-		rte_pktmbuf_free(pkts[i]);
-
+err:
 	return -1;
 }
 
 static __rte_always_inline int
 virtio_dev_tx_batch_packed(struct virtio_net *dev,
 			   struct vhost_virtqueue *vq,
-			   struct rte_mempool *mbuf_pool,
 			   struct rte_mbuf **pkts)
 {
 	uint16_t avail_idx = vq->last_avail_idx;
@@ -2347,8 +2351,8 @@ virtio_dev_tx_batch_packed(struct virtio_net *dev,
 	uint16_t ids[PACKED_BATCH_SIZE];
 	uint16_t i;
 
-	if (vhost_reserve_avail_batch_packed(dev, vq, mbuf_pool, pkts,
-					     avail_idx, desc_addrs, ids))
+	if (vhost_reserve_avail_batch_packed(dev, vq, pkts, avail_idx,
+					     desc_addrs, ids))
 		return -1;
 
 	vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE)
@@ -2381,7 +2385,7 @@ static __rte_always_inline int
 vhost_dequeue_single_packed(struct virtio_net *dev,
 			    struct vhost_virtqueue *vq,
 			    struct rte_mempool *mbuf_pool,
-			    struct rte_mbuf **pkts,
+			    struct rte_mbuf *pkts,
 			    uint16_t *buf_id,
 			    uint16_t *desc_count)
 {
@@ -2398,8 +2402,7 @@ vhost_dequeue_single_packed(struct virtio_net *dev,
 					 VHOST_ACCESS_RO) < 0))
 		return -1;
 
-	*pkts = virtio_dev_pktmbuf_alloc(dev, mbuf_pool, buf_len);
-	if (unlikely(*pkts == NULL)) {
+	if (unlikely(virtio_dev_pktmbuf_prep(dev, pkts, buf_len))) {
 		if (!allocerr_warned) {
 			VHOST_LOG_DATA(ERR,
 				"Failed mbuf alloc of size %d from %s on %s.\n",
@@ -2409,7 +2412,7 @@ vhost_dequeue_single_packed(struct virtio_net *dev,
 		return -1;
 	}
 
-	err = copy_desc_to_mbuf(dev, vq, buf_vec, nr_vec, *pkts,
+	err = copy_desc_to_mbuf(dev, vq, buf_vec, nr_vec, pkts,
 				mbuf_pool);
 	if (unlikely(err)) {
 		if (!allocerr_warned) {
@@ -2418,7 +2421,6 @@ vhost_dequeue_single_packed(struct virtio_net *dev,
 				dev->ifname);
 			allocerr_warned = true;
 		}
-		rte_pktmbuf_free(*pkts);
 		return -1;
 	}
 
@@ -2429,7 +2431,7 @@ static __rte_always_inline int
 virtio_dev_tx_single_packed(struct virtio_net *dev,
 			    struct vhost_virtqueue *vq,
 			    struct rte_mempool *mbuf_pool,
-			    struct rte_mbuf **pkts)
+			    struct rte_mbuf *pkts)
 {
 
 	uint16_t buf_id, desc_count = 0;
@@ -2462,11 +2464,14 @@ virtio_dev_tx_packed(struct virtio_net *dev,
 	uint32_t pkt_idx = 0;
 	uint32_t remained = count;
 
+	if (rte_pktmbuf_alloc_bulk(mbuf_pool, pkts, count))
+		return 0;
+
 	do {
 		rte_prefetch0(&vq->desc_packed[vq->last_avail_idx]);
 
 		if (remained >= PACKED_BATCH_SIZE) {
-			if (!virtio_dev_tx_batch_packed(dev, vq, mbuf_pool,
+			if (!virtio_dev_tx_batch_packed(dev, vq,
 							&pkts[pkt_idx])) {
 				pkt_idx += PACKED_BATCH_SIZE;
 				remained -= PACKED_BATCH_SIZE;
@@ -2475,13 +2480,16 @@ virtio_dev_tx_packed(struct virtio_net *dev,
 		}
 
 		if (virtio_dev_tx_single_packed(dev, vq, mbuf_pool,
-						&pkts[pkt_idx]))
+						pkts[pkt_idx]))
 			break;
 		pkt_idx++;
 		remained--;
 
 	} while (remained);
 
+	if (pkt_idx != count)
+		rte_pktmbuf_free_bulk(&pkts[pkt_idx], count - pkt_idx);
+
 	if (vq->shadow_used_idx) {
 		do_data_copy_dequeue(vq);
 
-- 
2.30.2

Re: [dpdk-dev] [PATCH v5] vhost: allocate and free packets in bulk in Tx packed

[David Marchand]

On Fri, Apr 16, 2021 at 12:26 PM Balazs Nemeth <bnemeth@redhat.com> wrote:
>
> Move allocation out further and perform all allocation in bulk. The same
> goes for freeing packets. In the process, also introduce
> virtio_dev_pktmbuf_prep and make virtio_dev_pktmbuf_alloc use that.
>
> Signed-off-by: Balazs Nemeth <bnemeth@redhat.com>

Reviewed-by: David Marchand <david.marchand@redhat.com>


-- 
David Marchand

Re: [dpdk-dev] [PATCH v5] vhost: allocate and free packets in bulk in Tx packed

[Maxime Coquelin]

On 4/16/21 12:25 PM, Balazs Nemeth wrote:
> Move allocation out further and perform all allocation in bulk. The same
> goes for freeing packets. In the process, also introduce
> virtio_dev_pktmbuf_prep and make virtio_dev_pktmbuf_alloc use that.
> 
> Signed-off-by: Balazs Nemeth <bnemeth@redhat.com>
> ---
>  lib/librte_vhost/virtio_net.c | 80 +++++++++++++++++++----------------
>  1 file changed, 44 insertions(+), 36 deletions(-)
> 

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

Thanks,
Maxime

Re: [dpdk-dev] [PATCH v5] vhost: allocate and free packets in bulk in Tx packed

[Xia, Chenbo]

> -----Original Message-----
> From: dev <dev-bounces@dpdk.org> On Behalf Of Maxime Coquelin
> Sent: Wednesday, April 21, 2021 3:49 PM
> To: Balazs Nemeth <bnemeth@redhat.com>; dev@dpdk.org
> Cc: david.marchand@redhat.com
> Subject: Re: [dpdk-dev] [PATCH v5] vhost: allocate and free packets in bulk in
> Tx packed
> 
> 
> 
> On 4/16/21 12:25 PM, Balazs Nemeth wrote:
> > Move allocation out further and perform all allocation in bulk. The same
> > goes for freeing packets. In the process, also introduce
> > virtio_dev_pktmbuf_prep and make virtio_dev_pktmbuf_alloc use that.
> >
> > Signed-off-by: Balazs Nemeth <bnemeth@redhat.com>
> > ---
> >  lib/librte_vhost/virtio_net.c | 80 +++++++++++++++++++----------------
> >  1 file changed, 44 insertions(+), 36 deletions(-)
> >

Patch applied to next-virtio/main with conflict resolved.

Thanks

[dpdk-dev] [PATCH v2 2/4] vhost: perform all mbuf allocations in one loop

[Balazs Nemeth]

Move allocation out further and perform all allocation in one loop. The
same goes for freeing packets. This is to prepare for use of bulk
versions of these functions.

Signed-off-by: Balazs Nemeth <bnemeth@redhat.com>
---
 lib/librte_vhost/virtio_net.c | 18 ++++++------------
 1 file changed, 6 insertions(+), 12 deletions(-)

diff --git a/lib/librte_vhost/virtio_net.c b/lib/librte_vhost/virtio_net.c
index 666e7fdb8..496f750e3 100644
--- a/lib/librte_vhost/virtio_net.c
+++ b/lib/librte_vhost/virtio_net.c
@@ -2471,14 +2471,13 @@ virtio_dev_tx_packed(struct virtio_net *dev,
 	uint32_t remained = count;
 	uint16_t i;
 
+	for (i = 0; i < count; ++i)
+		pkts[i] = rte_pktmbuf_alloc(mbuf_pool);
+
 	do {
 		rte_prefetch0(&vq->desc_packed[vq->last_avail_idx]);
 
 		if (remained >= PACKED_BATCH_SIZE) {
-			vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
-				pkts[pkt_idx + i] =
-					rte_pktmbuf_alloc(mbuf_pool);
-			}
 
 			if (!virtio_dev_tx_batch_packed(dev, vq,
 							&pkts[pkt_idx])) {
@@ -2486,19 +2485,11 @@ virtio_dev_tx_packed(struct virtio_net *dev,
 				remained -= PACKED_BATCH_SIZE;
 
 				continue;
-			} else {
-				vhost_for_each_try_unroll(i, 0,
-					PACKED_BATCH_SIZE) {
-					rte_pktmbuf_free(pkts[pkt_idx + i]);
-				}
 			}
 		}
 
-		pkts[pkt_idx] = rte_pktmbuf_alloc(mbuf_pool);
-
 		if (virtio_dev_tx_single_packed(dev, vq, mbuf_pool,
 						&pkts[pkt_idx])) {
-			rte_pktmbuf_free(pkts[pkt_idx]);
 			break;
 		}
 		pkt_idx++;
@@ -2506,6 +2497,9 @@ virtio_dev_tx_packed(struct virtio_net *dev,
 
 	} while (remained);
 
+	for (i = pkt_idx; i < count; ++i)
+		rte_pktmbuf_free(pkts[i]);
+
 	if (vq->shadow_used_idx) {
 		do_data_copy_dequeue(vq);
 
-- 
2.30.2

Re: [dpdk-dev] [PATCH v2 2/4] vhost: perform all mbuf allocations in one loop

[Maxime Coquelin]

On 4/7/21 12:17 PM, Balazs Nemeth wrote:
> Move allocation out further and perform all allocation in one loop. The
> same goes for freeing packets. This is to prepare for use of bulk
> versions of these functions.
> 
> Signed-off-by: Balazs Nemeth <bnemeth@redhat.com>
> ---
>  lib/librte_vhost/virtio_net.c | 18 ++++++------------
>  1 file changed, 6 insertions(+), 12 deletions(-)
> 
> diff --git a/lib/librte_vhost/virtio_net.c b/lib/librte_vhost/virtio_net.c
> index 666e7fdb8..496f750e3 100644
> --- a/lib/librte_vhost/virtio_net.c
> +++ b/lib/librte_vhost/virtio_net.c
> @@ -2471,14 +2471,13 @@ virtio_dev_tx_packed(struct virtio_net *dev,
>  	uint32_t remained = count;
>  	uint16_t i;
>  
> +	for (i = 0; i < count; ++i)
> +		pkts[i] = rte_pktmbuf_alloc(mbuf_pool);

Same comment as for previous patch, we need to check whether allocation
succeeded.

[dpdk-dev] [PATCH v2 3/4] vhost: allocate and free packets in bulk

[Balazs Nemeth]

Now that all allocation and freeing has been moved together, use the
faster bulk versions instead of handling packets one by one.

Signed-off-by: Balazs Nemeth <bnemeth@redhat.com>
---
 lib/librte_vhost/virtio_net.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/lib/librte_vhost/virtio_net.c b/lib/librte_vhost/virtio_net.c
index 496f750e3..2f0c97b91 100644
--- a/lib/librte_vhost/virtio_net.c
+++ b/lib/librte_vhost/virtio_net.c
@@ -2469,10 +2469,10 @@ virtio_dev_tx_packed(struct virtio_net *dev,
 {
 	uint32_t pkt_idx = 0;
 	uint32_t remained = count;
-	uint16_t i;
 
-	for (i = 0; i < count; ++i)
-		pkts[i] = rte_pktmbuf_alloc(mbuf_pool);
+	if (rte_pktmbuf_alloc_bulk(mbuf_pool, pkts, count)) {
+		return 0;
+	}
 
 	do {
 		rte_prefetch0(&vq->desc_packed[vq->last_avail_idx]);
@@ -2497,8 +2497,9 @@ virtio_dev_tx_packed(struct virtio_net *dev,
 
 	} while (remained);
 
-	for (i = pkt_idx; i < count; ++i)
-		rte_pktmbuf_free(pkts[i]);
+	if (pkt_idx != count) {
+		rte_pktmbuf_free_bulk(&pkts[pkt_idx], count - pkt_idx);
+	}
 
 	if (vq->shadow_used_idx) {
 		do_data_copy_dequeue(vq);
-- 
2.30.2

Re: [dpdk-dev] [PATCH v2 3/4] vhost: allocate and free packets in bulk

[Maxime Coquelin]

On 4/7/21 12:17 PM, Balazs Nemeth wrote:
> Now that all allocation and freeing has been moved together, use the
> faster bulk versions instead of handling packets one by one.
> 
> Signed-off-by: Balazs Nemeth <bnemeth@redhat.com>
> ---
>  lib/librte_vhost/virtio_net.c | 11 ++++++-----
>  1 file changed, 6 insertions(+), 5 deletions(-)
> 
> diff --git a/lib/librte_vhost/virtio_net.c b/lib/librte_vhost/virtio_net.c
> index 496f750e3..2f0c97b91 100644
> --- a/lib/librte_vhost/virtio_net.c
> +++ b/lib/librte_vhost/virtio_net.c
> @@ -2469,10 +2469,10 @@ virtio_dev_tx_packed(struct virtio_net *dev,
>  {
>  	uint32_t pkt_idx = 0;
>  	uint32_t remained = count;
> -	uint16_t i;
>  
> -	for (i = 0; i < count; ++i)
> -		pkts[i] = rte_pktmbuf_alloc(mbuf_pool);
> +	if (rte_pktmbuf_alloc_bulk(mbuf_pool, pkts, count)) {
> +		return 0;
> +	}

OK, get it now :)
Maybe just add a comment in previous patches that it is going to be
handled when moving to bulk allocation.

>  
>  	do {
>  		rte_prefetch0(&vq->desc_packed[vq->last_avail_idx]);
> @@ -2497,8 +2497,9 @@ virtio_dev_tx_packed(struct virtio_net *dev,
>  
>  	} while (remained);
>  
> -	for (i = pkt_idx; i < count; ++i)
> -		rte_pktmbuf_free(pkts[i]);
> +	if (pkt_idx != count) {
> +		rte_pktmbuf_free_bulk(&pkts[pkt_idx], count - pkt_idx);
> +	}
>  
>  	if (vq->shadow_used_idx) {
>  		do_data_copy_dequeue(vq);
> 

Re: [dpdk-dev] [PATCH v2 3/4] vhost: allocate and free packets in bulk

[David Marchand]

On Thu, Apr 15, 2021 at 5:33 PM Maxime Coquelin
<maxime.coquelin@redhat.com> wrote:
> On 4/7/21 12:17 PM, Balazs Nemeth wrote:
> > Now that all allocation and freeing has been moved together, use the
> > faster bulk versions instead of handling packets one by one.
> >
> > Signed-off-by: Balazs Nemeth <bnemeth@redhat.com>
> > ---
> >  lib/librte_vhost/virtio_net.c | 11 ++++++-----
> >  1 file changed, 6 insertions(+), 5 deletions(-)
> >
> > diff --git a/lib/librte_vhost/virtio_net.c b/lib/librte_vhost/virtio_net.c
> > index 496f750e3..2f0c97b91 100644
> > --- a/lib/librte_vhost/virtio_net.c
> > +++ b/lib/librte_vhost/virtio_net.c
> > @@ -2469,10 +2469,10 @@ virtio_dev_tx_packed(struct virtio_net *dev,
> >  {
> >       uint32_t pkt_idx = 0;
> >       uint32_t remained = count;
> > -     uint16_t i;
> >
> > -     for (i = 0; i < count; ++i)
> > -             pkts[i] = rte_pktmbuf_alloc(mbuf_pool);
> > +     if (rte_pktmbuf_alloc_bulk(mbuf_pool, pkts, count)) {
> > +             return 0;
> > +     }
>
> OK, get it now :)
> Maybe just add a comment in previous patches that it is going to be
> handled when moving to bulk allocation.

Looking at the whole series, it is easy to read and understand as a
single patch.
And it avoids this intermediate issue.



-- 
David Marchand

Re: [dpdk-dev] [PATCH v2 3/4] vhost: allocate and free packets in bulk

[Maxime Coquelin]

On 4/15/21 5:45 PM, David Marchand wrote:
> On Thu, Apr 15, 2021 at 5:33 PM Maxime Coquelin
> <maxime.coquelin@redhat.com> wrote:
>> On 4/7/21 12:17 PM, Balazs Nemeth wrote:
>>> Now that all allocation and freeing has been moved together, use the
>>> faster bulk versions instead of handling packets one by one.
>>>
>>> Signed-off-by: Balazs Nemeth <bnemeth@redhat.com>
>>> ---
>>>  lib/librte_vhost/virtio_net.c | 11 ++++++-----
>>>  1 file changed, 6 insertions(+), 5 deletions(-)
>>>
>>> diff --git a/lib/librte_vhost/virtio_net.c b/lib/librte_vhost/virtio_net.c
>>> index 496f750e3..2f0c97b91 100644
>>> --- a/lib/librte_vhost/virtio_net.c
>>> +++ b/lib/librte_vhost/virtio_net.c
>>> @@ -2469,10 +2469,10 @@ virtio_dev_tx_packed(struct virtio_net *dev,
>>>  {
>>>       uint32_t pkt_idx = 0;
>>>       uint32_t remained = count;
>>> -     uint16_t i;
>>>
>>> -     for (i = 0; i < count; ++i)
>>> -             pkts[i] = rte_pktmbuf_alloc(mbuf_pool);
>>> +     if (rte_pktmbuf_alloc_bulk(mbuf_pool, pkts, count)) {
>>> +             return 0;
>>> +     }
>>
>> OK, get it now :)
>> Maybe just add a comment in previous patches that it is going to be
>> handled when moving to bulk allocation.
> 
> Looking at the whole series, it is easy to read and understand as a
> single patch.
> And it avoids this intermediate issue.

I agree with David, better to squash the first three patches.

Thanks,
Maxime

Re: [dpdk-dev] [PATCH v2 3/4] vhost: allocate and free packets in bulk

[Maxime Coquelin]

On 4/15/21 5:50 PM, Maxime Coquelin wrote:
> 
> 
> On 4/15/21 5:45 PM, David Marchand wrote:
>> On Thu, Apr 15, 2021 at 5:33 PM Maxime Coquelin
>> <maxime.coquelin@redhat.com> wrote:
>>> On 4/7/21 12:17 PM, Balazs Nemeth wrote:
>>>> Now that all allocation and freeing has been moved together, use the
>>>> faster bulk versions instead of handling packets one by one.
>>>>
>>>> Signed-off-by: Balazs Nemeth <bnemeth@redhat.com>
>>>> ---
>>>>  lib/librte_vhost/virtio_net.c | 11 ++++++-----
>>>>  1 file changed, 6 insertions(+), 5 deletions(-)
>>>>
>>>> diff --git a/lib/librte_vhost/virtio_net.c b/lib/librte_vhost/virtio_net.c
>>>> index 496f750e3..2f0c97b91 100644
>>>> --- a/lib/librte_vhost/virtio_net.c
>>>> +++ b/lib/librte_vhost/virtio_net.c
>>>> @@ -2469,10 +2469,10 @@ virtio_dev_tx_packed(struct virtio_net *dev,
>>>>  {
>>>>       uint32_t pkt_idx = 0;
>>>>       uint32_t remained = count;
>>>> -     uint16_t i;
>>>>
>>>> -     for (i = 0; i < count; ++i)
>>>> -             pkts[i] = rte_pktmbuf_alloc(mbuf_pool);
>>>> +     if (rte_pktmbuf_alloc_bulk(mbuf_pool, pkts, count)) {
>>>> +             return 0;
>>>> +     }
>>>
>>> OK, get it now :)
>>> Maybe just add a comment in previous patches that it is going to be
>>> handled when moving to bulk allocation.
>>
>> Looking at the whole series, it is easy to read and understand as a
>> single patch.
>> And it avoids this intermediate issue.
> 
> I agree with David, better to squash the first three patches.

As David told me off-list, all the series can be squashed since the last
patch is a consequence of doing bulk allocation.

Cheers,
Maxime

> Thanks,
> Maxime
> 

[dpdk-dev] [PATCH v2 4/4] vhost: remove unnecessary level of indirection

[Balazs Nemeth]

There is no need to pass a pointer to an mbuf pointer.

Signed-off-by: Balazs Nemeth <bnemeth@redhat.com>
---
 lib/librte_vhost/virtio_net.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/lib/librte_vhost/virtio_net.c b/lib/librte_vhost/virtio_net.c
index 2f0c97b91..1d3ad18fe 100644
--- a/lib/librte_vhost/virtio_net.c
+++ b/lib/librte_vhost/virtio_net.c
@@ -2390,7 +2390,7 @@ static __rte_always_inline int
 vhost_dequeue_single_packed(struct virtio_net *dev,
 			    struct vhost_virtqueue *vq,
 			    struct rte_mempool *mbuf_pool,
-			    struct rte_mbuf **pkts,
+			    struct rte_mbuf *pkts,
 			    uint16_t *buf_id,
 			    uint16_t *desc_count)
 {
@@ -2408,7 +2408,7 @@ vhost_dequeue_single_packed(struct virtio_net *dev,
 		return -1;
 
 
-	if (unlikely(virtio_dev_pktmbuf_prep(dev, *pkts, buf_len))) {
+	if (unlikely(virtio_dev_pktmbuf_prep(dev, pkts, buf_len))) {
 		if (!allocerr_warned) {
 			VHOST_LOG_DATA(ERR,
 				"Failed mbuf alloc of size %d from %s on %s.\n",
@@ -2418,7 +2418,7 @@ vhost_dequeue_single_packed(struct virtio_net *dev,
 		return -1;
 	}
 
-	err = copy_desc_to_mbuf(dev, vq, buf_vec, nr_vec, *pkts,
+	err = copy_desc_to_mbuf(dev, vq, buf_vec, nr_vec, pkts,
 				mbuf_pool);
 	if (unlikely(err)) {
 		if (!allocerr_warned) {
@@ -2437,7 +2437,7 @@ static __rte_always_inline int
 virtio_dev_tx_single_packed(struct virtio_net *dev,
 			    struct vhost_virtqueue *vq,
 			    struct rte_mempool *mbuf_pool,
-			    struct rte_mbuf **pkts)
+			    struct rte_mbuf *pkts)
 {
 
 	uint16_t buf_id, desc_count = 0;
@@ -2489,7 +2489,7 @@ virtio_dev_tx_packed(struct virtio_net *dev,
 		}
 
 		if (virtio_dev_tx_single_packed(dev, vq, mbuf_pool,
-						&pkts[pkt_idx])) {
+						pkts[pkt_idx])) {
 			break;
 		}
 		pkt_idx++;
-- 
2.30.2

Re: [dpdk-dev] [PATCH v2 4/4] vhost: remove unnecessary level of indirection

[Maxime Coquelin]

On 4/7/21 12:17 PM, Balazs Nemeth wrote:
> There is no need to pass a pointer to an mbuf pointer.
> 
> Signed-off-by: Balazs Nemeth <bnemeth@redhat.com>
> ---
>  lib/librte_vhost/virtio_net.c | 10 +++++-----
>  1 file changed, 5 insertions(+), 5 deletions(-)
> 

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

Thanks,
Maxime

[dpdk-dev] [PATCH 2/4] vhost: perform all mbuf allocations in one loop

[Balazs Nemeth]

Move allocation out further and perform all allocation in one loop. The
same goes for freeing packets. This is to prepare for use of bulk
versions of these functions.

Signed-off-by: Balazs Nemeth <bnemeth@redhat.com>
---
 lib/librte_vhost/virtio_net.c | 18 ++++++------------
 1 file changed, 6 insertions(+), 12 deletions(-)

diff --git a/lib/librte_vhost/virtio_net.c b/lib/librte_vhost/virtio_net.c
index 666e7fdb8..496f750e3 100644
--- a/lib/librte_vhost/virtio_net.c
+++ b/lib/librte_vhost/virtio_net.c
@@ -2471,14 +2471,13 @@ virtio_dev_tx_packed(struct virtio_net *dev,
 	uint32_t remained = count;
 	uint16_t i;
 
+	for (i = 0; i < count; ++i)
+		pkts[i] = rte_pktmbuf_alloc(mbuf_pool);
+
 	do {
 		rte_prefetch0(&vq->desc_packed[vq->last_avail_idx]);
 
 		if (remained >= PACKED_BATCH_SIZE) {
-			vhost_for_each_try_unroll(i, 0, PACKED_BATCH_SIZE) {
-				pkts[pkt_idx + i] =
-					rte_pktmbuf_alloc(mbuf_pool);
-			}
 
 			if (!virtio_dev_tx_batch_packed(dev, vq,
 							&pkts[pkt_idx])) {
@@ -2486,19 +2485,11 @@ virtio_dev_tx_packed(struct virtio_net *dev,
 				remained -= PACKED_BATCH_SIZE;
 
 				continue;
-			} else {
-				vhost_for_each_try_unroll(i, 0,
-					PACKED_BATCH_SIZE) {
-					rte_pktmbuf_free(pkts[pkt_idx + i]);
-				}
 			}
 		}
 
-		pkts[pkt_idx] = rte_pktmbuf_alloc(mbuf_pool);
-
 		if (virtio_dev_tx_single_packed(dev, vq, mbuf_pool,
 						&pkts[pkt_idx])) {
-			rte_pktmbuf_free(pkts[pkt_idx]);
 			break;
 		}
 		pkt_idx++;
@@ -2506,6 +2497,9 @@ virtio_dev_tx_packed(struct virtio_net *dev,
 
 	} while (remained);
 
+	for (i = pkt_idx; i < count; ++i)
+		rte_pktmbuf_free(pkts[i]);
+
 	if (vq->shadow_used_idx) {
 		do_data_copy_dequeue(vq);
 
-- 
2.30.2

[dpdk-dev] [PATCH 3/4] vhost: allocate and free packets in bulk

[Balazs Nemeth]

Now that all allocation and freeing has been moved together, use the
faster bulk versions instead of handling packets one by one.

Signed-off-by: Balazs Nemeth <bnemeth@redhat.com>
---
 lib/librte_vhost/virtio_net.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/lib/librte_vhost/virtio_net.c b/lib/librte_vhost/virtio_net.c
index 496f750e3..e1696c0c0 100644
--- a/lib/librte_vhost/virtio_net.c
+++ b/lib/librte_vhost/virtio_net.c
@@ -2471,8 +2471,9 @@ virtio_dev_tx_packed(struct virtio_net *dev,
 	uint32_t remained = count;
 	uint16_t i;
 
-	for (i = 0; i < count; ++i)
-		pkts[i] = rte_pktmbuf_alloc(mbuf_pool);
+	if (rte_pktmbuf_alloc_bulk(mbuf_pool, pkts, count)) {
+		return 0;
+	}
 
 	do {
 		rte_prefetch0(&vq->desc_packed[vq->last_avail_idx]);
@@ -2497,8 +2498,9 @@ virtio_dev_tx_packed(struct virtio_net *dev,
 
 	} while (remained);
 
-	for (i = pkt_idx; i < count; ++i)
-		rte_pktmbuf_free(pkts[i]);
+	if (pkt_idx != count) {
+		rte_pktmbuf_free_bulk(&pkts[pkt_idx], count - pkt_idx);
+	}
 
 	if (vq->shadow_used_idx) {
 		do_data_copy_dequeue(vq);
-- 
2.30.2

[dpdk-dev] [PATCH 4/4] vhost: remove unnecessary level of indirection

[Balazs Nemeth]

There is no need to pass a pointer to an mbuf pointer.

Signed-off-by: Balazs Nemeth <bnemeth@redhat.com>
---
 lib/librte_vhost/virtio_net.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/lib/librte_vhost/virtio_net.c b/lib/librte_vhost/virtio_net.c
index e1696c0c0..179c57b46 100644
--- a/lib/librte_vhost/virtio_net.c
+++ b/lib/librte_vhost/virtio_net.c
@@ -2390,7 +2390,7 @@ static __rte_always_inline int
 vhost_dequeue_single_packed(struct virtio_net *dev,
 			    struct vhost_virtqueue *vq,
 			    struct rte_mempool *mbuf_pool,
-			    struct rte_mbuf **pkts,
+			    struct rte_mbuf *pkts,
 			    uint16_t *buf_id,
 			    uint16_t *desc_count)
 {
@@ -2408,7 +2408,7 @@ vhost_dequeue_single_packed(struct virtio_net *dev,
 		return -1;
 
 
-	if (unlikely(virtio_dev_pktmbuf_prep(dev, *pkts, buf_len))) {
+	if (unlikely(virtio_dev_pktmbuf_prep(dev, pkts, buf_len))) {
 		if (!allocerr_warned) {
 			VHOST_LOG_DATA(ERR,
 				"Failed mbuf alloc of size %d from %s on %s.\n",
@@ -2418,7 +2418,7 @@ vhost_dequeue_single_packed(struct virtio_net *dev,
 		return -1;
 	}
 
-	err = copy_desc_to_mbuf(dev, vq, buf_vec, nr_vec, *pkts,
+	err = copy_desc_to_mbuf(dev, vq, buf_vec, nr_vec, pkts,
 				mbuf_pool);
 	if (unlikely(err)) {
 		if (!allocerr_warned) {
@@ -2437,7 +2437,7 @@ static __rte_always_inline int
 virtio_dev_tx_single_packed(struct virtio_net *dev,
 			    struct vhost_virtqueue *vq,
 			    struct rte_mempool *mbuf_pool,
-			    struct rte_mbuf **pkts)
+			    struct rte_mbuf *pkts)
 {
 
 	uint16_t buf_id, desc_count = 0;
@@ -2490,7 +2490,7 @@ virtio_dev_tx_packed(struct virtio_net *dev,
 		}
 
 		if (virtio_dev_tx_single_packed(dev, vq, mbuf_pool,
-						&pkts[pkt_idx])) {
+						pkts[pkt_idx])) {
 			break;
 		}
 		pkt_idx++;
-- 
2.30.2