[PATCH] net/ena: use C11 atomic operations in platform header

[Stephen Hemminger]

Convert the legacy rte_atomic32_t and rte_atomic32_{inc,dec,set,read}
macros to C11 stdatomic equivalents. This clears another user of the
rte_atomicNN_*() family ahead of its deprecation.

Memory ordering is kept at seq_cst, matching the implicit ordering of
the legacy API. The ena_com access patterns can be audited and orderings
tightened in a follow-up.

Signed-off-by: Stephen Hemminger <stephen at networkplumber.org>
---
 drivers/net/ena/base/ena_plat_dpdk.h | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ena/base/ena_plat_dpdk.h b/drivers/net/ena/base/ena_plat_dpdk.h
index c84420de22..83b354d9da 100644
--- a/drivers/net/ena/base/ena_plat_dpdk.h
+++ b/drivers/net/ena/base/ena_plat_dpdk.h
@@ -40,7 +40,7 @@ typedef uint64_t dma_addr_t;
 #endif
 
 #define ENA_PRIu64 PRIu64
-#define ena_atomic32_t rte_atomic32_t
+typedef RTE_ATOMIC(int32_t) ena_atomic32_t;
 #define ena_mem_handle_t const struct rte_memzone *
 
 #define SZ_256 (256U)
@@ -267,10 +267,14 @@ ena_mem_alloc_coherent(struct rte_eth_dev_data *data, size_t size,
 #define ENA_REG_READ32(bus, reg)					       \
 	__extension__ ({ (void)(bus); rte_read32_relaxed((reg)); })
 
-#define ATOMIC32_INC(i32_ptr) rte_atomic32_inc(i32_ptr)
-#define ATOMIC32_DEC(i32_ptr) rte_atomic32_dec(i32_ptr)
-#define ATOMIC32_SET(i32_ptr, val) rte_atomic32_set(i32_ptr, val)
-#define ATOMIC32_READ(i32_ptr) rte_atomic32_read(i32_ptr)
+#define ATOMIC32_INC(i32_ptr)							\
+	rte_atomic_fetch_add_explicit((i32_ptr), 1, rte_memory_order_seq_cst)
+#define ATOMIC32_DEC(i32_ptr)							\
+	rte_atomic_fetch_sub_explicit((i32_ptr), 1, rte_memory_order_seq_cst)
+#define ATOMIC32_SET(i32_ptr, val)						\
+	rte_atomic_store_explicit((i32_ptr), (val), rte_memory_order_seq_cst)
+#define ATOMIC32_READ(i32_ptr)							\
+	rte_atomic_load_explicit((i32_ptr), rte_memory_order_seq_cst)
 
 #define msleep(x) rte_delay_us(x * 1000)
 #define udelay(x) rte_delay_us(x)
-- 
2.53.0