DPDK patches and discussions
 help / color / mirror / Atom feed
From: Joyce Kong <joyce.kong@arm.com>
To: maxime.coquelin@redhat.com, chenbo.xia@intel.com,
	honnappa.nagarahalli@arm.com, ruifeng.wang@arm.com
Cc: dev@dpdk.org, nd@arm.com
Subject: [dpdk-dev] [PATCH v1 2/8] examples/vhost_blk: replace smp with thread fence
Date: Mon, 21 Dec 2020 23:50:27 +0800
Message-ID: <20201221155033.6771-3-joyce.kong@arm.com> (raw)
In-Reply-To: <20201221155033.6771-1-joyce.kong@arm.com>

Simply replace the rte_smp_mb barriers with SEQ_CST atomic thread fence,
if there is no load/store operations.

Signed-off-by: Joyce Kong <joyce.kong@arm.com>
Reviewed-by: Ruifeng Wang <ruifeng.wang@arm.com>
---
 examples/vhost_blk/vhost_blk.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/examples/vhost_blk/vhost_blk.c b/examples/vhost_blk/vhost_blk.c
index bb293d492..7ea60863d 100644
--- a/examples/vhost_blk/vhost_blk.c
+++ b/examples/vhost_blk/vhost_blk.c
@@ -86,9 +86,9 @@ enqueue_task(struct vhost_blk_task *task)
 	 */
 	used->ring[used->idx & (vq->vring.size - 1)].id = task->req_idx;
 	used->ring[used->idx & (vq->vring.size - 1)].len = task->data_len;
-	rte_smp_mb();
+	rte_atomic_thread_fence(__ATOMIC_SEQ_CST);
 	used->idx++;
-	rte_smp_mb();
+	rte_atomic_thread_fence(__ATOMIC_SEQ_CST);
 
 	rte_vhost_clr_inflight_desc_split(task->ctrlr->vid,
 		vq->id, used->idx, task->req_idx);
@@ -112,12 +112,12 @@ enqueue_task_packed(struct vhost_blk_task *task)
 	desc->id = task->buffer_id;
 	desc->addr = 0;
 
-	rte_smp_mb();
+	rte_atomic_thread_fence(__ATOMIC_SEQ_CST);
 	if (vq->used_wrap_counter)
 		desc->flags |= VIRTQ_DESC_F_AVAIL | VIRTQ_DESC_F_USED;
 	else
 		desc->flags &= ~(VIRTQ_DESC_F_AVAIL | VIRTQ_DESC_F_USED);
-	rte_smp_mb();
+	rte_atomic_thread_fence(__ATOMIC_SEQ_CST);
 
 	rte_vhost_clr_inflight_desc_packed(task->ctrlr->vid, vq->id,
 					   task->inflight_idx);
-- 
2.29.2


  parent reply	other threads:[~2020-12-21 15:51 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-12-21 15:50 [dpdk-dev] [PATCH v1 0/8] replace smp barriers in vhost with C11 atomic Joyce Kong
2020-12-21 15:50 ` [dpdk-dev] [PATCH v1 1/8] examples/vhost: relax memory ordering when enqueue/dequeue Joyce Kong
2021-01-07 16:33   ` Maxime Coquelin
2020-12-21 15:50 ` Joyce Kong [this message]
2021-01-07 16:35   ` [dpdk-dev] [PATCH v1 2/8] examples/vhost_blk: replace smp with thread fence Maxime Coquelin
2020-12-21 15:50 ` [dpdk-dev] [PATCH v1 3/8] vhost: remove unnecessary smp barrier for desc flags Joyce Kong
2021-01-07 16:38   ` Maxime Coquelin
2020-12-21 15:50 ` [dpdk-dev] [PATCH v1 4/8] vhost: remove unnecessary smp barrier for avail idx Joyce Kong
2021-01-07 16:43   ` Maxime Coquelin
2020-12-21 15:50 ` [dpdk-dev] [PATCH v1 5/8] vhost: relax full barriers for desc flags Joyce Kong
2021-01-07 16:45   ` Maxime Coquelin
2020-12-21 15:50 ` [dpdk-dev] [PATCH v1 6/8] vhost: relax full barriers for used idx Joyce Kong
2021-01-07 16:46   ` Maxime Coquelin
2020-12-21 15:50 ` [dpdk-dev] [PATCH v1 7/8] vhost: replace smp with thread fence for packed vring Joyce Kong
2021-01-07 17:06   ` Maxime Coquelin
2020-12-21 15:50 ` [dpdk-dev] [PATCH v1 8/8] vhost: replace smp with thread fence for control path Joyce Kong
2021-01-07 17:15   ` Maxime Coquelin
2021-01-08  9:16 ` [dpdk-dev] [PATCH v1 0/8] replace smp barriers in vhost with C11 atomic Maxime Coquelin

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20201221155033.6771-3-joyce.kong@arm.com \
    --to=joyce.kong@arm.com \
    --cc=chenbo.xia@intel.com \
    --cc=dev@dpdk.org \
    --cc=honnappa.nagarahalli@arm.com \
    --cc=maxime.coquelin@redhat.com \
    --cc=nd@arm.com \
    --cc=ruifeng.wang@arm.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

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 \
		dev@dpdk.org
	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