DPDK patches and discussions
 help / color / mirror / Atom feed
From: Gavin Hu <gavin.hu@arm.com>
To: dev@dpdk.org
Cc: nd@arm.com, david.marchand@redhat.com, thomas@monjalon.net,
	mk@semihalf.com, gtzalik@amazon.com, evgenys@amazon.com,
	igorch@amazon.com, mw@semihalf.com, Honnappa.Nagarahalli@arm.com,
	ruifeng.wang@arm.com, phil.yang@arm.com, joyce.kong@arm.com
Subject: [dpdk-dev] [PATCH RFC v1 4/7] net/ena: relax barrier for completion queue update
Date: Fri, 13 Mar 2020 17:18:32 +0800	[thread overview]
Message-ID: <20200313091835.58039-5-gavin.hu@arm.com> (raw)
In-Reply-To: <20200313091835.58039-1-gavin.hu@arm.com>

To gaurantee the update observed by NIC HW, a cio barrier is sufficient,
an io barrier, which translates to dsb on aarch64, is overkill.

Suggested-by: Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>
Signed-off-by: Gavin Hu <gavin.hu@arm.com>
Reviewed-by: Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>
---
 drivers/net/ena/base/ena_eth_com.h | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ena/base/ena_eth_com.h b/drivers/net/ena/base/ena_eth_com.h
index e56c33a64..edfa98b72 100644
--- a/drivers/net/ena/base/ena_eth_com.h
+++ b/drivers/net/ena/base/ena_eth_com.h
@@ -180,7 +180,9 @@ static inline int ena_com_update_dev_comp_head(struct ena_com_io_cq *io_cq)
 		if (unlikely(need_update)) {
 			ena_trc_dbg("Write completion queue doorbell for queue %d: head: %d\n",
 				    io_cq->qid, head);
-			ENA_REG_WRITE32(io_cq->bus, head, io_cq->cq_head_db_reg);
+			rte_cio_wmb();
+			ENA_REG_WRITE32_RELAXED(io_cq->bus, head,
+				       io_cq->cq_head_db_reg);
 			io_cq->last_head_update = head;
 		}
 	}
-- 
2.17.1


  parent reply	other threads:[~2020-03-13  9:20 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-13  9:18 [dpdk-dev] [PATCH RFC v1 0/7] relax barriers for ENA PMD and small fixes Gavin Hu
2020-03-13  9:18 ` [dpdk-dev] [PATCH RFC v1 1/7] net/ena: remove duplicate barrier Gavin Hu
2020-03-13  9:18 ` [dpdk-dev] [PATCH RFC v1 2/7] net/ena: relax the barrier for doorbell ring Gavin Hu
2020-03-13  9:18 ` [dpdk-dev] [PATCH RFC v1 3/7] net/ena: relax the rmb for DMA Gavin Hu
2020-03-13  9:18 ` Gavin Hu [this message]
2020-03-13  9:18 ` [dpdk-dev] [PATCH RFC v1 5/7] net/ena: relax the barrier for bounce buffer Gavin Hu
2020-03-13  9:18 ` [dpdk-dev] [PATCH RFC v1 6/7] net/ena: use c11 atomic for statistics Gavin Hu
2020-03-13  9:18 ` [dpdk-dev] [PATCH RFC v1 7/7] net/ena: remove duplicate memset Gavin Hu
2020-03-16  9:34 ` [dpdk-dev] [PATCH RFC v1 0/7] relax barriers for ENA PMD and small fixes Chauskin, Igor
2020-03-17  7:58   ` Gavin Hu
2020-04-16 13:37     ` Chauskin, Igor
2020-04-21  7:45       ` Gavin Hu
2020-05-12 21:22         ` Honnappa Nagarahalli
2020-04-15 15:27   ` Ferruh Yigit
2020-04-15 15:59     ` Chauskin, Igor

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=20200313091835.58039-5-gavin.hu@arm.com \
    --to=gavin.hu@arm.com \
    --cc=Honnappa.Nagarahalli@arm.com \
    --cc=david.marchand@redhat.com \
    --cc=dev@dpdk.org \
    --cc=evgenys@amazon.com \
    --cc=gtzalik@amazon.com \
    --cc=igorch@amazon.com \
    --cc=joyce.kong@arm.com \
    --cc=mk@semihalf.com \
    --cc=mw@semihalf.com \
    --cc=nd@arm.com \
    --cc=phil.yang@arm.com \
    --cc=ruifeng.wang@arm.com \
    --cc=thomas@monjalon.net \
    /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
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).