diff mbox series

[RFC,2/2] examples/vhost: use API to check inflight packets

Message ID 20220216070417.9597-3-xuan.ding@intel.com (mailing list archive)
State Superseded, archived
Delegated to: Maxime Coquelin
Headers
Series add unsafe API to get inflight packets |

Checks

Context Check Description
ci/checkpatch success coding style OK
ci/Intel-compilation success Compilation OK
ci/intel-Testing success Testing PASS

Commit Message

Ding, Xuan Feb. 16, 2022, 7:04 a.m. UTC 
  From: Xuan Ding <xuan.ding@intel.com>

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.ding@intel.com>
---
 examples/vhost/main.c | 28 +++++++++++++++-------------
 examples/vhost/main.h |  1 -
 2 files changed, 15 insertions(+), 14 deletions(-)

Comments

Maxime Coquelin March 28, 2022, 3:19 p.m. UTC | #1 
Hi Xuan,

On 2/16/22 08:04, xuan.ding@intel.com wrote:
> From: Xuan Ding <xuan.ding@intel.com>
> 
> 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.ding@intel.com>
> ---
>   examples/vhost/main.c | 28 +++++++++++++++-------------
>   examples/vhost/main.h |  1 -
>   2 files changed, 15 insertions(+), 14 deletions(-)
> 

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

Thanks,
Maxime
diff mbox series

Patch

diff --git a/examples/vhost/main.c b/examples/vhost/main.c
index 3e784f5c6f..ba7ab23f4e 100644
--- a/examples/vhost/main.c
+++ b/examples/vhost/main.c
@@ -972,10 +972,8 @@  complete_async_pkts(struct vhost_dev *vdev)
 
 	complete_count = rte_vhost_poll_enqueue_completed(vdev->vid,
 					VIRTIO_RXQ, p_cpl, MAX_PKT_BURST, dma_id, 0);
-	if (complete_count) {
+	if (complete_count)
 		free_pkts(p_cpl, complete_count);
-		__atomic_sub_fetch(&vdev->pkts_inflight, complete_count, __ATOMIC_SEQ_CST);
-	}
 
 }
 
@@ -1017,7 +1015,6 @@  drain_vhost(struct vhost_dev *vdev)
 
 		complete_async_pkts(vdev);
 		ret = rte_vhost_submit_enqueue_burst(vdev->vid, VIRTIO_RXQ, m, nr_xmit, dma_id, 0);
-		__atomic_add_fetch(&vdev->pkts_inflight, ret, __ATOMIC_SEQ_CST);
 
 		enqueue_fail = nr_xmit - ret;
 		if (enqueue_fail)
@@ -1346,7 +1343,6 @@  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, dma_id, 0);
-		__atomic_add_fetch(&vdev->pkts_inflight, enqueue_count, __ATOMIC_SEQ_CST);
 
 		enqueue_fail = rx_count - enqueue_count;
 		if (enqueue_fail)
@@ -1518,14 +1514,17 @@  destroy_device(int vid)
 
 	if (dma_bind[vid].dmas[VIRTIO_RXQ].async_enabled) {
 		uint16_t n_pkt = 0;
+		int pkts_inflight;
 		int16_t dma_id = dma_bind[vid].dmas[VIRTIO_RXQ].dev_id;
-		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, dma_id, 0);
+						m_cpl, pkts_inflight, dma_id, 0);
 			free_pkts(m_cpl, n_pkt);
-			__atomic_sub_fetch(&vdev->pkts_inflight, n_pkt, __ATOMIC_SEQ_CST);
+			pkts_inflight = rte_vhost_async_get_inflight_thread_unsafe(vid,
+										VIRTIO_RXQ);
 		}
 
 		rte_vhost_async_channel_unregister(vid, VIRTIO_RXQ);
@@ -1629,14 +1628,17 @@  vring_state_changed(int vid, uint16_t queue_id, int enable)
 	if (dma_bind[vid].dmas[queue_id].async_enabled) {
 		if (!enable) {
 			uint16_t n_pkt = 0;
+			int pkts_inflight;
+			pkts_inflight = rte_vhost_async_get_inflight_thread_unsafe(vid, queue_id);
 			int16_t dma_id = dma_bind[vid].dmas[VIRTIO_RXQ].dev_id;
-			struct rte_mbuf *m_cpl[vdev->pkts_inflight];
+			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, dma_id, 0);
+							m_cpl, pkts_inflight, dma_id, 0);
 				free_pkts(m_cpl, n_pkt);
-				__atomic_sub_fetch(&vdev->pkts_inflight, n_pkt, __ATOMIC_SEQ_CST);
+				pkts_inflight = rte_vhost_async_get_inflight_thread_unsafe(vid,
+											queue_id);
 			}
 		}
 	}
diff --git a/examples/vhost/main.h b/examples/vhost/main.h
index b4a453e77e..e7f395c3c9 100644
--- a/examples/vhost/main.h
+++ b/examples/vhost/main.h
@@ -52,7 +52,6 @@  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;