[PATCH v2 5/7] net/ixgbe: replace rte atomics with GCC builtin atomics

[Tyler Retzlaff <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/net/ixgbe/ixgbe_bypass.c |  1 -
 drivers/net/ixgbe/ixgbe_ethdev.c | 18 ++++++++++++------
 drivers/net/ixgbe/ixgbe_ethdev.h |  3 ++-
 drivers/net/ixgbe/ixgbe_flow.c   |  1 -
 drivers/net/ixgbe/ixgbe_rxtx.c   |  1 -
 5 files changed, 14 insertions(+), 10 deletions(-)

diff --git a/drivers/net/ixgbe/ixgbe_bypass.c b/drivers/net/ixgbe/ixgbe_bypass.c
index 94f34a2..f615d18 100644
--- a/drivers/net/ixgbe/ixgbe_bypass.c
+++ b/drivers/net/ixgbe/ixgbe_bypass.c
@@ -3,7 +3,6 @@
  */
 
 #include <time.h>
-#include <rte_atomic.h>
 #include <ethdev_driver.h>
 #include "ixgbe_ethdev.h"
 #include "ixgbe_bypass_api.h"
diff --git a/drivers/net/ixgbe/ixgbe_ethdev.c b/drivers/net/ixgbe/ixgbe_ethdev.c
index 88118bc..2d575f5 100644
--- a/drivers/net/ixgbe/ixgbe_ethdev.c
+++ b/drivers/net/ixgbe/ixgbe_ethdev.c
@@ -1127,7 +1127,8 @@ struct rte_ixgbe_xstats_name_off {
 		return 0;
 	}
 
-	rte_atomic32_clear(&ad->link_thread_running);
+	// NOTE: review for potential ordering optimization
+	__atomic_clear(&ad->link_thread_running, __ATOMIC_SEQ_CST);
 	ixgbe_parse_devargs(eth_dev->data->dev_private,
 			    pci_dev->device.devargs);
 	rte_eth_copy_pci_info(eth_dev, pci_dev);
@@ -1625,7 +1626,8 @@ static int ixgbe_l2_tn_filter_init(struct rte_eth_dev *eth_dev)
 		return 0;
 	}
 
-	rte_atomic32_clear(&ad->link_thread_running);
+	// NOTE: review for potential ordering optimization
+	__atomic_clear(&ad->link_thread_running, __ATOMIC_SEQ_CST);
 	ixgbevf_parse_devargs(eth_dev->data->dev_private,
 			      pci_dev->device.devargs);
 
@@ -4186,7 +4188,8 @@ static int ixgbevf_dev_xstats_get_names(__rte_unused struct rte_eth_dev *dev,
 	struct ixgbe_adapter *ad = dev->data->dev_private;
 	uint32_t timeout = timeout_ms ? timeout_ms : WARNING_TIMEOUT;
 
-	while (rte_atomic32_read(&ad->link_thread_running)) {
+	// NOTE: review for potential ordering optimization
+	while (__atomic_load_n(&ad->link_thread_running, __ATOMIC_SEQ_CST)) {
 		msec_delay(1);
 		timeout--;
 
@@ -4222,7 +4225,8 @@ static int ixgbevf_dev_xstats_get_names(__rte_unused struct rte_eth_dev *dev,
 	ixgbe_setup_link(hw, speed, true);
 
 	intr->flags &= ~IXGBE_FLAG_NEED_LINK_CONFIG;
-	rte_atomic32_clear(&ad->link_thread_running);
+	// NOTE: review for potential ordering optimization
+	__atomic_clear(&ad->link_thread_running, __ATOMIC_SEQ_CST);
 	return NULL;
 }
 
@@ -4317,7 +4321,8 @@ static int ixgbevf_dev_xstats_get_names(__rte_unused struct rte_eth_dev *dev,
 	if (link_up == 0) {
 		if (ixgbe_get_media_type(hw) == ixgbe_media_type_fiber) {
 			ixgbe_dev_wait_setup_link_complete(dev, 0);
-			if (rte_atomic32_test_and_set(&ad->link_thread_running)) {
+			// NOTE: review for potential ordering optimization
+			if (__atomic_test_and_set(&ad->link_thread_running, __ATOMIC_SEQ_CST)) {
 				/* To avoid race condition between threads, set
 				 * the IXGBE_FLAG_NEED_LINK_CONFIG flag only
 				 * when there is no link thread running.
@@ -4330,7 +4335,8 @@ static int ixgbevf_dev_xstats_get_names(__rte_unused struct rte_eth_dev *dev,
 					dev) < 0) {
 					PMD_DRV_LOG(ERR,
 						"Create link thread failed!");
-					rte_atomic32_clear(&ad->link_thread_running);
+					// NOTE: review for potential ordering optimization
+					__atomic_clear(&ad->link_thread_running, __ATOMIC_SEQ_CST);
 				}
 			} else {
 				PMD_DRV_LOG(ERR,
diff --git a/drivers/net/ixgbe/ixgbe_ethdev.h b/drivers/net/ixgbe/ixgbe_ethdev.h
index 48290af..2ca6998 100644
--- a/drivers/net/ixgbe/ixgbe_ethdev.h
+++ b/drivers/net/ixgbe/ixgbe_ethdev.h
@@ -6,6 +6,7 @@
 #define _IXGBE_ETHDEV_H_
 
 #include <stdint.h>
+#include <stdbool.h>
 #include <sys/queue.h>
 
 #include "base/ixgbe_type.h"
@@ -510,7 +511,7 @@ struct ixgbe_adapter {
 	 */
 	uint8_t pflink_fullchk;
 	uint8_t mac_ctrl_frame_fwd;
-	rte_atomic32_t link_thread_running;
+	bool link_thread_running;
 	pthread_t link_thread_tid;
 };
 
diff --git a/drivers/net/ixgbe/ixgbe_flow.c b/drivers/net/ixgbe/ixgbe_flow.c
index eac81ee..687341c 100644
--- a/drivers/net/ixgbe/ixgbe_flow.c
+++ b/drivers/net/ixgbe/ixgbe_flow.c
@@ -18,7 +18,6 @@
 #include <rte_log.h>
 #include <rte_debug.h>
 #include <rte_pci.h>
-#include <rte_atomic.h>
 #include <rte_branch_prediction.h>
 #include <rte_memory.h>
 #include <rte_eal.h>
diff --git a/drivers/net/ixgbe/ixgbe_rxtx.c b/drivers/net/ixgbe/ixgbe_rxtx.c
index c9d6ca9..8d7251d 100644
--- a/drivers/net/ixgbe/ixgbe_rxtx.c
+++ b/drivers/net/ixgbe/ixgbe_rxtx.c
@@ -27,7 +27,6 @@
 #include <rte_eal.h>
 #include <rte_per_lcore.h>
 #include <rte_lcore.h>
-#include <rte_atomic.h>
 #include <rte_branch_prediction.h>
 #include <rte_mempool.h>
 #include <rte_malloc.h>
-- 
1.8.3.1