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vhost: simplify async IO vectors iterators

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This patch splits the iterator arrays in two, one for
source and one for destination. The goal is make the code
easier to understand.

Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
Reviewed-by: Chenbo Xia <chenbo.xia@intel.com>
Reviewed-by: Jiayu Hu <jiayu.hu@intel.com>
This commit is contained in:
Maxime Coquelin 2021-10-26 18:28:53 +02:00
parent 97064162d4
commit 3fe629547e
2 changed files with 15 additions and 14 deletions
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5
lib/vhost/vhost.h
View File

@ -48,7 +48,7 @@
#define MAX_PKT_BURST 32
#define VHOST_MAX_ASYNC_IT (MAX_PKT_BURST * 2)
#define VHOST_MAX_ASYNC_IT (MAX_PKT_BURST)
#define VHOST_MAX_ASYNC_VEC (BUF_VECTOR_MAX * 2)
#define PACKED_DESC_ENQUEUE_USED_FLAG(w) \
@ -132,7 +132,8 @@ struct vhost_async {
/* operation callbacks for DMA */
struct rte_vhost_async_channel_ops ops;
struct rte_vhost_iov_iter it_pool[VHOST_MAX_ASYNC_IT];
struct rte_vhost_iov_iter src_iov_iter[VHOST_MAX_ASYNC_IT];
struct rte_vhost_iov_iter dst_iov_iter[VHOST_MAX_ASYNC_IT];
struct iovec src_iovec[VHOST_MAX_ASYNC_VEC];
struct iovec dst_iovec[VHOST_MAX_ASYNC_VEC];

24
lib/vhost/virtio_net.c
View File

@ -1511,7 +1511,8 @@ virtio_dev_rx_async_submit_split(struct virtio_net *dev,
uint16_t avail_head;
struct vhost_async *async = vq->async;
struct rte_vhost_iov_iter *it_pool = async->it_pool;
struct rte_vhost_iov_iter *src_iter = async->src_iov_iter;
struct rte_vhost_iov_iter *dst_iter = async->dst_iov_iter;
struct rte_vhost_async_desc tdes[MAX_PKT_BURST];
struct iovec *src_iovec = async->src_iovec;
struct iovec *dst_iovec = async->dst_iovec;
@ -1547,20 +1548,19 @@ virtio_dev_rx_async_submit_split(struct virtio_net *dev,
if (async_mbuf_to_desc(dev, vq, pkts[pkt_idx], buf_vec, nr_vec, num_buffers,
&src_iovec[iovec_idx], &dst_iovec[iovec_idx],
&it_pool[it_idx], &it_pool[it_idx + 1]) < 0) {
&src_iter[it_idx], &dst_iter[it_idx]) < 0) {
vq->shadow_used_idx -= num_buffers;
break;
}
async_fill_desc(&tdes[pkt_burst_idx++], &it_pool[it_idx],
&it_pool[it_idx + 1]);
async_fill_desc(&tdes[pkt_burst_idx++], &src_iter[it_idx], &dst_iter[it_idx]);
slot_idx = (async->pkts_idx + pkt_idx) & (vq->size - 1);
pkts_info[slot_idx].descs = num_buffers;
pkts_info[slot_idx].mbuf = pkts[pkt_idx];
iovec_idx += it_pool[it_idx].nr_segs;
it_idx += 2;
iovec_idx += src_iter[it_idx].nr_segs;
it_idx++;
vq->last_avail_idx += num_buffers;
@ -1829,7 +1829,8 @@ virtio_dev_rx_async_submit_packed(struct virtio_net *dev,
uint16_t num_descs;
struct vhost_async *async = vq->async;
struct rte_vhost_iov_iter *it_pool = async->it_pool;
struct rte_vhost_iov_iter *src_iter = async->src_iov_iter;
struct rte_vhost_iov_iter *dst_iter = async->dst_iov_iter;
struct rte_vhost_async_desc tdes[MAX_PKT_BURST];
struct iovec *src_iovec = async->src_iovec;
struct iovec *dst_iovec = async->dst_iovec;
@ -1846,18 +1847,17 @@ virtio_dev_rx_async_submit_packed(struct virtio_net *dev,
if (unlikely(virtio_dev_rx_async_packed(dev, vq, pkts[pkt_idx],
&num_descs, &num_buffers,
&src_iovec[iovec_idx], &dst_iovec[iovec_idx],
&it_pool[it_idx], &it_pool[it_idx + 1]) < 0))
&src_iter[it_idx], &dst_iter[it_idx]) < 0))
break;
slot_idx = (async->pkts_idx + pkt_idx) % vq->size;
async_fill_desc(&tdes[pkt_burst_idx++], &it_pool[it_idx],
&it_pool[it_idx + 1]);
async_fill_desc(&tdes[pkt_burst_idx++], &src_iter[it_idx], &dst_iter[it_idx]);
pkts_info[slot_idx].descs = num_descs;
pkts_info[slot_idx].nr_buffers = num_buffers;
pkts_info[slot_idx].mbuf = pkts[pkt_idx];
iovec_idx += it_pool[it_idx].nr_segs;
it_idx += 2;
iovec_idx += src_iter[it_idx].nr_segs;
it_idx++;
pkt_idx++;
remained--;