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From: "Hu, Jiayu" <jiayu.hu@intel.com>
To: "Jiang, Cheng1" <cheng1.jiang@intel.com>,
	"maxime.coquelin@redhat.com" <maxime.coquelin@redhat.com>,
	"Xia, Chenbo" <chenbo.xia@intel.com>
Cc: "dev@dpdk.org" <dev@dpdk.org>,
	"Yang, YvonneX" <yvonnex.yang@intel.com>,
	"Wang, Yinan" <yinan.wang@intel.com>,
	"Liu, Yong" <yong.liu@intel.com>
Subject: Re: [dpdk-dev] [PATCH v8 2/4] vhost: add support for packed ring in async vhost
Date: Tue, 27 Apr 2021 05:16:23 +0000
Message-ID: <bbfb72dac4014bfa9d83d185dd87e3a5@intel.com> (raw)
In-Reply-To: <20210419085104.47078-3-Cheng1.jiang@intel.com>

Hi Cheng,

Some comments are inline.

> -----Original Message-----
> From: Jiang, Cheng1 <cheng1.jiang@intel.com>
> Sent: Monday, April 19, 2021 4:51 PM
> To: maxime.coquelin@redhat.com; Xia, Chenbo <chenbo.xia@intel.com>
> Cc: dev@dpdk.org; Hu, Jiayu <jiayu.hu@intel.com>; Yang, YvonneX
> <yvonnex.yang@intel.com>; Wang, Yinan <yinan.wang@intel.com>; Liu,
> Yong <yong.liu@intel.com>; Jiang, Cheng1 <cheng1.jiang@intel.com>
> Subject: [PATCH v8 2/4] vhost: add support for packed ring in async vhost
> 
> For now async vhost data path only supports split ring. This patch
> enables packed ring in async vhost data path to make async vhost
> compatible with virtio 1.1 spec.
> 
> Signed-off-by: Cheng Jiang <Cheng1.jiang@intel.com>
> ---
>  lib/librte_vhost/rte_vhost_async.h |   1 +
>  lib/librte_vhost/vhost.c           |  79 ++++--
>  lib/librte_vhost/vhost.h           |  15 +-
>  lib/librte_vhost/virtio_net.c      | 441 +++++++++++++++++++++++++++--
>  4 files changed, 488 insertions(+), 48 deletions(-)
> 
> diff --git a/lib/librte_vhost/virtio_net.c b/lib/librte_vhost/virtio_net.c
> index 438bdafd1..ce88ad3c0 100644
> --- a/lib/librte_vhost/virtio_net.c
> +++ b/lib/librte_vhost/virtio_net.c
> @@ -363,14 +363,14 @@
> vhost_shadow_dequeue_single_packed_inorder(struct vhost_virtqueue *vq,
>  }
> 
>  static __rte_always_inline void
> -vhost_shadow_enqueue_single_packed(struct virtio_net *dev,
> -				   struct vhost_virtqueue *vq,
> -				   uint32_t len[],
> -				   uint16_t id[],
> -				   uint16_t count[],
> +vhost_shadow_enqueue_packed(struct vhost_virtqueue *vq,
> +				   uint32_t *len,
> +				   uint16_t *id,
> +				   uint16_t *count,
>  				   uint16_t num_buffers)
>  {
>  	uint16_t i;
> +
>  	for (i = 0; i < num_buffers; i++) {
>  		/* enqueue shadow flush action aligned with batch num */
>  		if (!vq->shadow_used_idx)
> @@ -382,6 +382,17 @@ vhost_shadow_enqueue_single_packed(struct
> virtio_net *dev,
>  		vq->shadow_aligned_idx += count[i];
>  		vq->shadow_used_idx++;
>  	}
> +}
> +
> +static __rte_always_inline void
> +vhost_shadow_enqueue_single_packed(struct virtio_net *dev,
> +				   struct vhost_virtqueue *vq,
> +				   uint32_t *len,
> +				   uint16_t *id,
> +				   uint16_t *count,
> +				   uint16_t num_buffers)
> +{
> +	vhost_shadow_enqueue_packed(vq, len, id, count, num_buffers);
> 
>  	if (vq->shadow_aligned_idx >= PACKED_BATCH_SIZE) {
>  		do_data_copy_enqueue(dev, vq);
> @@ -1474,6 +1485,23 @@ store_dma_desc_info_split(struct
> vring_used_elem *s_ring, struct vring_used_elem
>  	}
>  }
> 
> +static __rte_always_inline void
> +store_dma_desc_info_packed(struct vring_used_elem_packed *s_ring,
> +		struct vring_used_elem_packed *d_ring,
> +		uint16_t ring_size, uint16_t s_idx, uint16_t d_idx, uint16_t
> count)
> +{
> +	uint16_t elem_size = sizeof(struct vring_used_elem_packed);
> +
> +	if (d_idx + count <= ring_size) {
> +		rte_memcpy(d_ring + d_idx, s_ring + s_idx, count *
> elem_size);
> +	} else {
> +		uint16_t size = ring_size - d_idx;
> +
> +		rte_memcpy(d_ring + d_idx, s_ring + s_idx, size * elem_size);
> +		rte_memcpy(d_ring, s_ring + s_idx + size, (count - size) *
> elem_size);
> +	}
> +}
> +
>  static __rte_noinline uint32_t
>  virtio_dev_rx_async_submit_split(struct virtio_net *dev,
>  	struct vhost_virtqueue *vq, uint16_t queue_id,
> @@ -1556,12 +1584,12 @@ virtio_dev_rx_async_submit_split(struct
> virtio_net *dev,
>  			 * descriptors.
>  			 */
>  			from = vq->shadow_used_idx - num_buffers;
> -			to = vq->async_desc_idx & (vq->size - 1);
> +			to = vq->async_desc_idx_split & (vq->size - 1);
> 
>  			store_dma_desc_info_split(vq->shadow_used_split,
>  					vq->async_descs_split, vq->size, from,
> to, num_buffers);
> 
> -			vq->async_desc_idx += num_buffers;
> +			vq->async_desc_idx_split += num_buffers;
>  			vq->shadow_used_idx -= num_buffers;
>  		} else
>  			comp_pkts[num_done_pkts++] = pkts[pkt_idx];
> @@ -1619,7 +1647,7 @@ virtio_dev_rx_async_submit_split(struct virtio_net
> *dev,
>  			num_descs += pkts_info[slot_idx & (vq->size -
> 1)].descs;
>  			slot_idx--;
>  		}
> -		vq->async_desc_idx -= num_descs;
> +		vq->async_desc_idx_split -= num_descs;
>  		/* recover shadow used ring and available ring */
>  		vq->shadow_used_idx -= (vq->last_avail_idx -
> 
> 	async_pkts_log[num_async_pkts].last_avail_idx -
> @@ -1641,6 +1669,329 @@ virtio_dev_rx_async_submit_split(struct
> virtio_net *dev,
>  	return pkt_idx;
>  }
> 
> +static __rte_always_inline void
> +vhost_update_used_packed(struct vhost_virtqueue *vq,
> +			struct vring_used_elem_packed *shadow_ring,
> +			uint16_t count)
> +{
> +	int i;
> +	uint16_t used_idx = vq->last_used_idx;
> +	uint16_t head_idx = vq->last_used_idx;
> +	uint16_t head_flags = 0;
> +
> +	if (count == 0)
> +		return;
> +
> +	/* Split loop in two to save memory barriers */
> +	for (i = 0; i < count; i++) {
> +		vq->desc_packed[used_idx].id = shadow_ring[i].id;
> +		vq->desc_packed[used_idx].len = shadow_ring[i].len;
> +
> +		used_idx += shadow_ring[i].count;
> +		if (used_idx >= vq->size)
> +			used_idx -= vq->size;
> +	}
> +
> +	/* The ordering for storing desc flags needs to be enforced. */
> +	rte_atomic_thread_fence(__ATOMIC_RELEASE);
> +
> +	for (i = 0; i < count; i++) {
> +		uint16_t flags;
> +
> +		if (vq->shadow_used_packed[i].len)
> +			flags = VRING_DESC_F_WRITE;
> +		else
> +			flags = 0;
> +
> +		if (vq->used_wrap_counter) {
> +			flags |= VRING_DESC_F_USED;
> +			flags |= VRING_DESC_F_AVAIL;
> +		} else {
> +			flags &= ~VRING_DESC_F_USED;
> +			flags &= ~VRING_DESC_F_AVAIL;
> +		}
> +
> +		if (i > 0) {
> +			vq->desc_packed[vq->last_used_idx].flags = flags;
> +		} else {
> +			head_idx = vq->last_used_idx;
> +			head_flags = flags;
> +		}
> +
> +		vq_inc_last_used_packed(vq, shadow_ring[i].count);
> +	}
> +
> +	vq->desc_packed[head_idx].flags = head_flags;
> +}
> +
> +static __rte_always_inline int
> +vhost_enqueue_async_single_packed(struct virtio_net *dev,
> +			    struct vhost_virtqueue *vq,
> +			    struct rte_mbuf *pkt,
> +			    struct buf_vector *buf_vec,
> +			    uint16_t *nr_descs,
> +			    uint16_t *nr_buffers,
> +			    struct vring_packed_desc *async_descs,
> +			    struct iovec *src_iovec, struct iovec *dst_iovec,
> +			    struct rte_vhost_iov_iter *src_it,
> +			    struct rte_vhost_iov_iter *dst_it)
> +{
> +	uint16_t nr_vec = 0;
> +	uint16_t avail_idx = vq->last_avail_idx;
> +	uint16_t max_tries, tries = 0;
> +	uint16_t buf_id = 0;
> +	uint32_t len = 0;
> +	uint16_t desc_count = 0;
> +	uint32_t size = pkt->pkt_len + sizeof(struct
> virtio_net_hdr_mrg_rxbuf);
> +	uint32_t buffer_len[vq->size];
> +	uint16_t buffer_buf_id[vq->size];
> +	uint16_t buffer_desc_count[vq->size];
> +	*nr_buffers = 0;
nr_buffers and nr_descs are pointers of num_buffers and num_desc in
virtio_dev_rx_async_submit_packed(), and num_buffers and num_desc
don't have init values. I think you need to init them before pass their
pointers to another function, as it will read/update values pointed by the
pointers.

In addition, *nr_buffers is set to 0, but *nr_descs is not, and both of them are set to
0 in virtio_dev_rx_async_single_packed(). It looks strange.

> +
> +	if (rxvq_is_mergeable(dev))
> +		max_tries = vq->size - 1;
> +	else
> +		max_tries = 1;
> +
> +	while (size > 0) {
> +		/*
> +		 * if we tried all available ring items, and still
> +		 * can't get enough buf, it means something abnormal
> +		 * happened.
> +		 */
> +		if (unlikely(++tries > max_tries))
> +			return -1;
> +
> +		if (unlikely(fill_vec_buf_packed(dev, vq, avail_idx,
> &desc_count, buf_vec, &nr_vec,
> +						&buf_id, &len,
> VHOST_ACCESS_RW) < 0))
> +			return -1;
> +
> +		len = RTE_MIN(len, size);
> +		size -= len;
> +
> +		buffer_len[*nr_buffers] = len;
> +		buffer_buf_id[*nr_buffers] = buf_id;
> +		buffer_desc_count[*nr_buffers] = desc_count;
> +		*nr_buffers += 1;
> +
> +		*nr_descs += desc_count;
> +		avail_idx += desc_count;
> +		if (avail_idx >= vq->size)
> +			avail_idx -= vq->size;
> +	}
> +
> +	if (async_mbuf_to_desc(dev, vq, pkt, buf_vec, nr_vec, *nr_buffers,
> src_iovec, dst_iovec,
> +			src_it, dst_it) < 0)
> +		return -1;
> +	/* store descriptors for DMA */
> +	if (avail_idx >= *nr_descs) {
> +		rte_memcpy(async_descs, &vq->desc_packed[vq-
> >last_avail_idx],
> +			*nr_descs * sizeof(struct vring_packed_desc));
> +	} else {
> +		uint16_t nr_copy = vq->size - vq->last_avail_idx;

It needs a blank line.

> +		rte_memcpy(async_descs, &vq->desc_packed[vq-
> >last_avail_idx],
> +			nr_copy * sizeof(struct vring_packed_desc));
> +		rte_memcpy(async_descs + nr_copy, vq->desc_packed,
> +			(*nr_descs - nr_copy) * sizeof(struct
> vring_packed_desc));
> +	}
> +
> +	vhost_shadow_enqueue_packed(vq, buffer_len, buffer_buf_id,
> buffer_desc_count, *nr_buffers);
> +
> +	return 0;
> +}
> +
> +static __rte_always_inline int16_t
> +virtio_dev_rx_async_single_packed(struct virtio_net *dev, struct
> vhost_virtqueue *vq,
> +			    struct rte_mbuf *pkt, uint16_t *nr_descs, uint16_t
> *nr_buffers,
> +			    struct vring_packed_desc *async_descs,
> +			    struct iovec *src_iovec, struct iovec *dst_iovec,
> +			    struct rte_vhost_iov_iter *src_it, struct
> rte_vhost_iov_iter *dst_it)
> +{
> +	struct buf_vector buf_vec[BUF_VECTOR_MAX];
> +	*nr_descs = 0;
> +	*nr_buffers = 0;
> +
> +	if (unlikely(vhost_enqueue_async_single_packed(dev, vq, pkt,
> buf_vec, nr_descs, nr_buffers,
> +						 async_descs, src_iovec,
> dst_iovec,
> +						 src_it, dst_it) < 0)) {
> +		VHOST_LOG_DATA(DEBUG, "(%d) failed to get enough desc
> from vring\n", dev->vid);
> +		return -1;
> +	}
> +
> +	VHOST_LOG_DATA(DEBUG, "(%d) current index %d | end
> index %d\n",
> +			dev->vid, vq->last_avail_idx, vq->last_avail_idx +
> *nr_descs);
> +
> +	return 0;
> +}
> +
> +static __rte_always_inline void
> +dma_error_handler_packed(struct vhost_virtqueue *vq, struct
> vring_packed_desc *async_descs,
> +			uint16_t async_descs_idx, uint16_t slot_idx, uint32_t
> nr_err,
> +			uint32_t *pkt_idx, uint32_t *num_async_pkts,
> uint32_t *num_done_pkts)
> +{
> +	uint16_t descs_err = 0;
> +	uint16_t buffers_err = 0;
> +	struct async_inflight_info *pkts_info = vq->async_pkts_info;
> +
> +	*num_async_pkts -= nr_err;
> +	*pkt_idx -= nr_err;
> +	/* calculate the sum of buffers and descs of DMA-error packets. */
> +	while (nr_err-- > 0) {
> +		descs_err += pkts_info[slot_idx % vq->size].descs;
> +		buffers_err += pkts_info[slot_idx % vq->size].nr_buffers;
> +		slot_idx--;
> +	}
> +
> +	vq->async_buffer_idx_packed -= buffers_err;
> +
> +	if (vq->last_avail_idx >= descs_err) {
> +		vq->last_avail_idx -= descs_err;
> +
> +		rte_memcpy(&vq->desc_packed[vq->last_avail_idx],
> +			&async_descs[async_descs_idx - descs_err],
> +			descs_err * sizeof(struct vring_packed_desc));
> +	} else {
> +		uint16_t nr_copy;
> +
> +		vq->last_avail_idx = vq->last_avail_idx + vq->size - descs_err;
> +		nr_copy = vq->size - vq->last_avail_idx;
> +		rte_memcpy(&vq->desc_packed[vq->last_avail_idx],
> +			&async_descs[async_descs_idx - descs_err],
> +			nr_copy * sizeof(struct vring_packed_desc));
> +		descs_err -= nr_copy;
> +		rte_memcpy(&vq->desc_packed[0],
> &async_descs[async_descs_idx - descs_err],
> +			descs_err * sizeof(struct vring_packed_desc));
> +		vq->avail_wrap_counter ^= 1;
> +	}
> +
> +	*num_done_pkts = *pkt_idx - *num_async_pkts;
> +}
> +
> +static __rte_noinline uint32_t
> +virtio_dev_rx_async_submit_packed(struct virtio_net *dev,
> +	struct vhost_virtqueue *vq, uint16_t queue_id,
> +	struct rte_mbuf **pkts, uint32_t count,
> +	struct rte_mbuf **comp_pkts, uint32_t *comp_count)
> +{
> +	uint32_t pkt_idx = 0, pkt_burst_idx = 0;
> +	uint16_t async_descs_idx = 0;
> +	uint16_t num_buffers;
> +	uint16_t num_desc;
How about using "num_descs" to make naming consist with "num_buffers"?

Thanks,
Jiayu

  reply	other threads:[~2021-04-27  5:16 UTC|newest]

Thread overview: 60+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-17  8:54 [dpdk-dev] [PATCH] " Cheng Jiang
2021-03-22  6:15 ` [dpdk-dev] [PATCH v2] " Cheng Jiang
2021-03-24  9:19   ` Liu, Yong
2021-03-29 12:29     ` Jiang, Cheng1
2021-03-31 14:06 ` [dpdk-dev] [PATCH v3] " Cheng Jiang
2021-04-07  6:26   ` Hu, Jiayu
2021-04-08 12:01     ` Jiang, Cheng1
2021-04-10 10:25 ` [dpdk-dev] [PATCH v4 0/4] " Cheng Jiang
2021-04-10 10:25   ` [dpdk-dev] [PATCH v4 1/4] vhost: abstract and reorganize async split ring code Cheng Jiang
2021-04-10 10:25   ` Cheng Jiang
2021-04-10 10:25   ` [dpdk-dev] [PATCH v4 2/4] vhost: add support for packed ring in async vhost Cheng Jiang
2021-04-10 10:25   ` [dpdk-dev] [PATCH v4 3/4] vhost: add batch datapath for async vhost packed ring Cheng Jiang
2021-04-10 10:25   ` [dpdk-dev] [PATCH v4 4/4] doc: add release note for vhost async " Cheng Jiang
2021-04-12 11:34 ` [dpdk-dev] [PATCH v5 0/4] add support for packed ring in async vhost Cheng Jiang
2021-04-12 11:34   ` [dpdk-dev] [PATCH v5 1/4] vhost: abstract and reorganize async split ring code Cheng Jiang
2021-04-13  2:44     ` Hu, Jiayu
2021-04-13  3:26       ` Jiang, Cheng1
2021-04-13  7:11     ` Maxime Coquelin
2021-04-13  9:06       ` Jiang, Cheng1
2021-04-12 11:34   ` [dpdk-dev] [PATCH v5 2/4] vhost: add support for packed ring in async vhost Cheng Jiang
2021-04-13  8:36     ` Maxime Coquelin
2021-04-13 11:48       ` Jiang, Cheng1
2021-04-13 13:08         ` Maxime Coquelin
2021-04-13 13:50           ` Jiang, Cheng1
2021-04-12 11:34   ` [dpdk-dev] [PATCH v5 3/4] vhost: add batch datapath for async vhost packed ring Cheng Jiang
2021-04-12 11:34   ` [dpdk-dev] [PATCH v5 4/4] doc: add release note for vhost async " Cheng Jiang
2021-04-13 14:55 ` [dpdk-dev] [PATCH v6 0/4] add support for packed ring in async vhost Cheng Jiang
2021-04-13 14:55   ` [dpdk-dev] [PATCH v6 1/4] vhost: abstract and reorganize async split ring code Cheng Jiang
2021-04-13 14:55   ` [dpdk-dev] [PATCH v6 2/4] vhost: add support for packed ring in async vhost Cheng Jiang
2021-04-13 14:55   ` [dpdk-dev] [PATCH v6 3/4] vhost: add batch datapath for async vhost packed ring Cheng Jiang
2021-04-13 14:55   ` [dpdk-dev] [PATCH v6 4/4] doc: add release note for vhost async " Cheng Jiang
2021-04-14  6:13 ` [dpdk-dev] [PATCH v7 0/4] add support for packed ring in async vhost Cheng Jiang
2021-04-14  6:13   ` [dpdk-dev] [PATCH v7 1/4] vhost: abstract and reorganize async split ring code Cheng Jiang
2021-04-14 12:24     ` Maxime Coquelin
2021-04-14  6:13   ` [dpdk-dev] [PATCH v7 2/4] vhost: add support for packed ring in async vhost Cheng Jiang
2021-04-14 13:40     ` Maxime Coquelin
2021-04-15  5:42       ` Jiang, Cheng1
2021-04-15  2:02     ` Hu, Jiayu
2021-04-15  5:54       ` Jiang, Cheng1
2021-04-14  6:13   ` [dpdk-dev] [PATCH v7 3/4] vhost: add batch datapath for async vhost packed ring Cheng Jiang
2021-04-14  6:13   ` [dpdk-dev] [PATCH v7 4/4] doc: add release note for vhost async " Cheng Jiang
2021-04-19  8:51 ` [dpdk-dev] [PATCH v8 0/4] add support for packed ring in async vhost Cheng Jiang
2021-04-19  8:51   ` [dpdk-dev] [PATCH v8 1/4] vhost: abstract and reorganize async split ring code Cheng Jiang
2021-04-27  1:19     ` Hu, Jiayu
2021-04-19  8:51   ` [dpdk-dev] [PATCH v8 2/4] vhost: add support for packed ring in async vhost Cheng Jiang
2021-04-27  5:16     ` Hu, Jiayu [this message]
2021-04-27  6:07       ` Jiang, Cheng1
2021-04-19  8:51   ` [dpdk-dev] [PATCH v8 3/4] vhost: add batch datapath for async vhost packed ring Cheng Jiang
2021-04-19  8:51   ` [dpdk-dev] [PATCH v8 4/4] doc: add release note for vhost async " Cheng Jiang
2021-04-27  8:03 ` [dpdk-dev] [PATCH v9 0/4] add support for packed ring in async vhost Cheng Jiang
2021-04-27  8:03   ` [dpdk-dev] [PATCH v9 1/4] vhost: abstract and reorganize async split ring code Cheng Jiang
2021-04-27  8:03   ` [dpdk-dev] [PATCH v9 2/4] vhost: add support for packed ring in async vhost Cheng Jiang
2021-04-29  1:48     ` Hu, Jiayu
2021-04-29  9:50     ` Maxime Coquelin
2021-04-27  8:03   ` [dpdk-dev] [PATCH v9 3/4] vhost: add batch datapath for async vhost packed ring Cheng Jiang
2021-04-29  9:57     ` Maxime Coquelin
2021-04-27  8:03   ` [dpdk-dev] [PATCH v9 4/4] doc: add release note for vhost async " Cheng Jiang
2021-04-29  9:58     ` Maxime Coquelin
2021-05-04 18:38     ` Ferruh Yigit
2021-05-04  8:28   ` [dpdk-dev] [PATCH v9 0/4] add support for packed ring in async vhost Maxime Coquelin

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DPDK patches and discussions

This inbox may be cloned and mirrored by anyone:

	git clone --mirror https://inbox.dpdk.org/dev/0 dev/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 dev dev/ https://inbox.dpdk.org/dev \
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	public-inbox-index dev

Example config snippet for mirrors.
Newsgroup available over NNTP:
	nntp://inbox.dpdk.org/inbox.dpdk.dev


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git