[dpdk-dev] [PATCH v2 4/4] ethdev: use C11 atomic builtins for link status update
Phil Yang
phil.yang at arm.com
Wed Sep 16 10:23:48 CEST 2020
Since rte_atomicXX APIs are not allowed to be used, use C11 atomic
builtins for link status update.
Signed-off-by: Phil Yang <phil.yang at arm.com>
Reviewed-by: Ruifeng Wang <ruifeng.wang at arm.com>
Reviewed-by: Honnappa Nagarahalli <honnappa.nagarahalli at arm.com>
---
lib/librte_ethdev/rte_ethdev_driver.h | 19 +++++--------------
1 file changed, 5 insertions(+), 14 deletions(-)
diff --git a/lib/librte_ethdev/rte_ethdev_driver.h b/lib/librte_ethdev/rte_ethdev_driver.h
index 13fd049..ebaf6da 100644
--- a/lib/librte_ethdev/rte_ethdev_driver.h
+++ b/lib/librte_ethdev/rte_ethdev_driver.h
@@ -216,8 +216,7 @@ static inline int
rte_eth_linkstatus_set(struct rte_eth_dev *dev,
const struct rte_eth_link *new_link)
{
- volatile uint64_t *dev_link
- = (volatile uint64_t *)&(dev->data->dev_link);
+ uint64_t *dev_link = (uint64_t *)&(dev->data->dev_link);
union {
uint64_t val64;
struct rte_eth_link link;
@@ -225,8 +224,8 @@ rte_eth_linkstatus_set(struct rte_eth_dev *dev,
RTE_BUILD_BUG_ON(sizeof(*new_link) != sizeof(uint64_t));
- orig.val64 = rte_atomic64_exchange(dev_link,
- *(const uint64_t *)new_link);
+ orig.val64 = __atomic_exchange_n(dev_link, *(const uint64_t *)new_link,
+ __ATOMIC_SEQ_CST);
return (orig.link.link_status == new_link->link_status) ? -1 : 0;
}
@@ -244,20 +243,12 @@ static inline void
rte_eth_linkstatus_get(const struct rte_eth_dev *dev,
struct rte_eth_link *link)
{
- volatile uint64_t *src = (uint64_t *)&(dev->data->dev_link);
+ uint64_t *src = (uint64_t *)&(dev->data->dev_link);
uint64_t *dst = (uint64_t *)link;
RTE_BUILD_BUG_ON(sizeof(*link) != sizeof(uint64_t));
-#ifdef __LP64__
- /* if cpu arch has 64 bit unsigned lon then implicitly atomic */
- *dst = *src;
-#else
- /* can't use rte_atomic64_read because it returns signed int */
- do {
- *dst = *src;
- } while (!rte_atomic64_cmpset(src, *dst, *dst));
-#endif
+ *dst = __atomic_load_n(src, __ATOMIC_SEQ_CST);
}
/**
--
2.7.4
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