DPDK patches and discussions
 help / color / mirror / Atom feed
From: Tyler Retzlaff <roretzla@linux.microsoft.com>
To: dev@dpdk.org
Cc: Honnappa.Nagarahalli@arm.com, Ruifeng.Wang@arm.com,
	thomas@monjalon.net, stephen@networkplumber.org,
	mb@smartsharesystems.com,
	Tyler Retzlaff <roretzla@linux.microsoft.com>
Subject: [PATCH v3 3/7] dma/idxd: replace rte atomics with GCC builtin atomics
Date: Thu, 23 Mar 2023 15:53:52 -0700	[thread overview]
Message-ID: <1679612036-30773-4-git-send-email-roretzla@linux.microsoft.com> (raw)
In-Reply-To: <1679612036-30773-1-git-send-email-roretzla@linux.microsoft.com>

Replace the use of rte_atomic.h types and functions, instead use GCC
supplied C++11 memory model builtins.

Signed-off-by: Tyler Retzlaff <roretzla@linux.microsoft.com>
---
 drivers/dma/idxd/idxd_internal.h | 3 +--
 drivers/dma/idxd/idxd_pci.c      | 8 +++++---
 2 files changed, 6 insertions(+), 5 deletions(-)

diff --git a/drivers/dma/idxd/idxd_internal.h b/drivers/dma/idxd/idxd_internal.h
index 180a858..cd41777 100644
--- a/drivers/dma/idxd/idxd_internal.h
+++ b/drivers/dma/idxd/idxd_internal.h
@@ -7,7 +7,6 @@
 
 #include <rte_dmadev_pmd.h>
 #include <rte_spinlock.h>
-#include <rte_atomic.h>
 
 #include "idxd_hw_defs.h"
 
@@ -34,7 +33,7 @@ struct idxd_pci_common {
 	rte_spinlock_t lk;
 
 	uint8_t wq_cfg_sz;
-	rte_atomic16_t ref_count;
+	uint16_t ref_count;
 	volatile struct rte_idxd_bar0 *regs;
 	volatile uint32_t *wq_regs_base;
 	volatile struct rte_idxd_grpcfg *grp_regs;
diff --git a/drivers/dma/idxd/idxd_pci.c b/drivers/dma/idxd/idxd_pci.c
index 781fa02..2de5d15 100644
--- a/drivers/dma/idxd/idxd_pci.c
+++ b/drivers/dma/idxd/idxd_pci.c
@@ -6,7 +6,6 @@
 #include <rte_devargs.h>
 #include <rte_dmadev_pmd.h>
 #include <rte_malloc.h>
-#include <rte_atomic.h>
 
 #include "idxd_internal.h"
 
@@ -136,7 +135,9 @@
 	/* if this is the last WQ on the device, disable the device and free
 	 * the PCI struct
 	 */
-	is_last_wq = rte_atomic16_dec_and_test(&idxd->u.pci->ref_count);
+	/* NOTE: review for potential ordering optimization */
+	is_last_wq = __atomic_fetch_sub(&idxd->u.pci->ref_count, 1,
+		__ATOMIC_SEQ_CST) - 1 == 0;
 	if (is_last_wq) {
 		/* disable the device */
 		err_code = idxd_pci_dev_command(idxd, idxd_disable_dev);
@@ -350,7 +351,8 @@
 				free(idxd.u.pci);
 			return ret;
 		}
-		rte_atomic16_inc(&idxd.u.pci->ref_count);
+		/* NOTE: review for potential ordering optimization */
+		__atomic_fetch_add(&idxd.u.pci->ref_count, 1, __ATOMIC_SEQ_CST);
 	}
 
 	return 0;
-- 
1.8.3.1


  parent reply	other threads:[~2023-03-23 22:54 UTC|newest]

Thread overview: 83+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-03-17 20:19 [PATCH 0/7] " Tyler Retzlaff
2023-03-17 20:19 ` [PATCH 1/7] ring: " Tyler Retzlaff
2023-03-17 20:36   ` Tyler Retzlaff
2023-03-17 20:19 ` [PATCH 2/7] stack: " Tyler Retzlaff
2023-03-17 20:19 ` [PATCH 3/7] dma/idxd: " Tyler Retzlaff
2023-03-17 20:19 ` [PATCH 4/7] net/ice: " Tyler Retzlaff
2023-03-17 20:41   ` Tyler Retzlaff
2023-03-17 20:19 ` [PATCH 5/7] net/ixgbe: " Tyler Retzlaff
2023-03-17 20:19 ` [PATCH 6/7] net/null: " Tyler Retzlaff
2023-03-17 20:44   ` Tyler Retzlaff
2023-03-17 20:19 ` [PATCH 7/7] net/ring: " Tyler Retzlaff
2023-03-17 21:42 ` [PATCH 0/7] " Stephen Hemminger
2023-03-17 21:49   ` Tyler Retzlaff
2023-03-22 11:28     ` Morten Brørup
2023-03-22 14:21       ` Tyler Retzlaff
2023-03-22 14:58         ` Morten Brørup
2023-03-22 15:29           ` Tyler Retzlaff
2023-03-22 16:13             ` Morten Brørup
2023-03-22 16:40               ` Honnappa Nagarahalli
2023-03-22 17:07                 ` Morten Brørup
2023-03-22 17:38                   ` Honnappa Nagarahalli
2023-03-22 18:06                     ` Tyler Retzlaff
2023-05-02  3:37                       ` Tyler Retzlaff
2023-05-02  4:31                         ` Honnappa Nagarahalli
2023-03-23 22:34 ` [PATCH v2 " Tyler Retzlaff
2023-03-23 22:34   ` [PATCH v2 1/7] ring: " Tyler Retzlaff
2023-03-23 22:34   ` [PATCH v2 2/7] stack: " Tyler Retzlaff
2023-03-23 22:34   ` [PATCH v2 3/7] dma/idxd: " Tyler Retzlaff
2023-03-23 22:34   ` [PATCH v2 4/7] net/ice: " Tyler Retzlaff
2023-03-23 22:34   ` [PATCH v2 5/7] net/ixgbe: " Tyler Retzlaff
2023-03-23 22:34   ` [PATCH v2 6/7] net/null: " Tyler Retzlaff
2023-03-23 22:34   ` [PATCH v2 7/7] net/ring: " Tyler Retzlaff
2023-03-24  7:07   ` [PATCH v2 0/7] " Morten Brørup
2023-03-23 22:53 ` [PATCH v3 " Tyler Retzlaff
2023-03-23 22:53   ` [PATCH v3 1/7] ring: " Tyler Retzlaff
2023-03-23 22:53   ` [PATCH v3 2/7] stack: " Tyler Retzlaff
2023-05-24 20:08     ` David Marchand
2023-03-23 22:53   ` Tyler Retzlaff [this message]
2023-05-24 20:09     ` [PATCH v3 3/7] dma/idxd: " David Marchand
2023-05-25  8:41       ` Bruce Richardson
2023-05-25 13:59         ` Morten Brørup
2023-05-25 12:57     ` Kevin Laatz
2023-03-23 22:53   ` [PATCH v3 4/7] net/ice: " Tyler Retzlaff
2023-05-24 20:10     ` David Marchand
2023-03-23 22:53   ` [PATCH v3 5/7] net/ixgbe: " Tyler Retzlaff
2023-05-24 20:11     ` David Marchand
2023-03-23 22:53   ` [PATCH v3 6/7] net/null: " Tyler Retzlaff
2023-05-24 20:13     ` David Marchand
2023-03-23 22:53   ` [PATCH v3 7/7] net/ring: " Tyler Retzlaff
2023-05-24 20:12     ` David Marchand
2023-05-25  8:44       ` Bruce Richardson
2023-03-24  7:09   ` [PATCH v3 0/7] " Morten Brørup
2023-03-24 19:22     ` Tyler Retzlaff
2023-05-24 12:40   ` David Marchand
2023-05-24 15:47     ` Tyler Retzlaff
2023-05-24 20:06       ` David Marchand
2023-05-24 22:50         ` Tyler Retzlaff
2023-05-24 22:56           ` Honnappa Nagarahalli
2023-05-25  0:02             ` Tyler Retzlaff
2023-05-25  7:50               ` Morten Brørup
2023-06-02 19:45 ` [PATCH v4 0/6] " Tyler Retzlaff
2023-06-02 19:45   ` [PATCH v4 1/6] stack: " Tyler Retzlaff
2023-06-02 19:45   ` [PATCH v4 2/6] dma/idxd: " Tyler Retzlaff
2023-06-02 19:45   ` [PATCH v4 3/6] net/ice: " Tyler Retzlaff
2023-06-02 19:45   ` [PATCH v4 4/6] net/ixgbe: " Tyler Retzlaff
2023-06-02 19:45   ` [PATCH v4 5/6] net/null: " Tyler Retzlaff
2023-06-02 19:45   ` [PATCH v4 6/6] net/ring: " Tyler Retzlaff
2023-06-05  8:27     ` Olivier Matz
2023-06-06 21:45 ` [PATCH v5 0/6] " Tyler Retzlaff
2023-06-06 21:45   ` [PATCH v5 1/6] stack: " Tyler Retzlaff
2023-06-06 21:45   ` [PATCH v5 2/6] dma/idxd: " Tyler Retzlaff
2023-06-06 21:45   ` [PATCH v5 3/6] net/ice: " Tyler Retzlaff
2023-06-06 21:45   ` [PATCH v5 4/6] net/ixgbe: " Tyler Retzlaff
2023-06-06 21:45   ` [PATCH v5 5/6] net/null: " Tyler Retzlaff
2023-06-06 21:45   ` [PATCH v5 6/6] net/ring: " Tyler Retzlaff
2023-06-09 15:01   ` [PATCH v5 0/6] " David Marchand
2023-06-09 15:13     ` Tyler Retzlaff
2023-06-22 19:59       ` Patrick Robb
2023-06-23  8:53         ` David Marchand
2023-06-23 21:37           ` Tyler Retzlaff
2023-06-28 14:01             ` Patrick Robb
2023-06-28 14:49               ` David Marchand
2023-06-23 21:35         ` Tyler Retzlaff

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=1679612036-30773-4-git-send-email-roretzla@linux.microsoft.com \
    --to=roretzla@linux.microsoft.com \
    --cc=Honnappa.Nagarahalli@arm.com \
    --cc=Ruifeng.Wang@arm.com \
    --cc=dev@dpdk.org \
    --cc=mb@smartsharesystems.com \
    --cc=stephen@networkplumber.org \
    --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).