On 28/09/2021 07:24, Xuan Ding wrote:
In async data path, call rte_vhost_async_get_inflight_thread_unsafe()
API to directly return the number of inflight packets instead of
maintaining a local variable.
Signed-off-by: Xuan Ding <xuan.d...@intel.com>
---
examples/vhost/main.c | 25 +++++++++++--------------
examples/vhost/main.h | 1 -
2 files changed, 11 insertions(+), 15 deletions(-)
diff --git a/examples/vhost/main.c b/examples/vhost/main.c
index d0bf1f31e3..3faac6d053 100644
--- a/examples/vhost/main.c
+++ b/examples/vhost/main.c
@@ -842,11 +842,8 @@ complete_async_pkts(struct vhost_dev *vdev)
complete_count = rte_vhost_poll_enqueue_completed(vdev->vid,
VIRTIO_RXQ, p_cpl, MAX_PKT_BURST);
- if (complete_count) {
+ if (complete_count)
free_pkts(p_cpl, complete_count);
- __atomic_sub_fetch(&vdev->pkts_inflight, complete_count,
__ATOMIC_SEQ_CST);
- }
-
}
static __rte_always_inline void
@@ -886,7 +883,6 @@ drain_vhost(struct vhost_dev *vdev)
complete_async_pkts(vdev);
ret = rte_vhost_submit_enqueue_burst(vdev->vid, VIRTIO_RXQ, m,
nr_xmit);
- __atomic_add_fetch(&vdev->pkts_inflight, ret, __ATOMIC_SEQ_CST);
enqueue_fail = nr_xmit - ret;
if (enqueue_fail)
@@ -1212,7 +1208,6 @@ drain_eth_rx(struct vhost_dev *vdev)
complete_async_pkts(vdev);
enqueue_count = rte_vhost_submit_enqueue_burst(vdev->vid,
VIRTIO_RXQ, pkts, rx_count);
- __atomic_add_fetch(&vdev->pkts_inflight, enqueue_count,
__ATOMIC_SEQ_CST);
enqueue_fail = rx_count - enqueue_count;
if (enqueue_fail)
@@ -1338,6 +1333,7 @@ destroy_device(int vid)
struct vhost_dev *vdev = NULL;
int lcore;
uint16_t i;
+ int pkts_inflight;
You can move this down to the block it is used in
TAILQ_FOREACH(vdev, &vhost_dev_list, global_vdev_entry) {
if (vdev->vid == vid)
@@ -1384,13 +1380,13 @@ destroy_device(int vid)
if (async_vhost_driver) {
uint16_t n_pkt = 0;
- struct rte_mbuf *m_cpl[vdev->pkts_inflight];
+ pkts_inflight = rte_vhost_async_get_inflight_thread_unsafe(vid,
VIRTIO_RXQ);
+ struct rte_mbuf *m_cpl[pkts_inflight];
- while (vdev->pkts_inflight) {
+ while (pkts_inflight) {
n_pkt = rte_vhost_clear_queue_thread_unsafe(vid,
VIRTIO_RXQ,
- m_cpl, vdev->pkts_inflight);
+ m_cpl, pkts_inflight);
free_pkts(m_cpl, n_pkt);
- __atomic_sub_fetch(&vdev->pkts_inflight, n_pkt,
__ATOMIC_SEQ_CST);
This is an infinite loop if there are pkts_inflight, need to recheck
pkts_inflight in the loop.
}
rte_vhost_async_channel_unregister(vid, VIRTIO_RXQ);
@@ -1486,6 +1482,7 @@ static int
vring_state_changed(int vid, uint16_t queue_id, int enable)
{
struct vhost_dev *vdev = NULL;
+ int pkts_inflight;
TAILQ_FOREACH(vdev, &vhost_dev_list, global_vdev_entry) {
if (vdev->vid == vid)
@@ -1500,13 +1497,13 @@ vring_state_changed(int vid, uint16_t queue_id, int
enable)
if (async_vhost_driver) {
if (!enable) {
uint16_t n_pkt = 0;
- struct rte_mbuf *m_cpl[vdev->pkts_inflight];
+ pkts_inflight =
rte_vhost_async_get_inflight_thread_unsafe(vid, queue_id);
+ struct rte_mbuf *m_cpl[pkts_inflight];
- while (vdev->pkts_inflight) {
+ while (pkts_inflight) {
n_pkt =
rte_vhost_clear_queue_thread_unsafe(vid, queue_id,
- m_cpl,
vdev->pkts_inflight);
+ m_cpl, pkts_inflight);
free_pkts(m_cpl, n_pkt);
- __atomic_sub_fetch(&vdev->pkts_inflight, n_pkt,
__ATOMIC_SEQ_CST);
Same comments as destroy_device
}
}
}
diff --git a/examples/vhost/main.h b/examples/vhost/main.h
index e7b1ac60a6..0ccdce4b4a 100644
--- a/examples/vhost/main.h
+++ b/examples/vhost/main.h
@@ -51,7 +51,6 @@ struct vhost_dev {
uint64_t features;
size_t hdr_len;
uint16_t nr_vrings;
- uint16_t pkts_inflight;
struct rte_vhost_memory *mem;
struct device_statistics stats;
TAILQ_ENTRY(vhost_dev) global_vdev_entry;
