[dpdk-dev] [PATCH v9 4/5] bpf: use wait until scheme for Rx/Tx iteration

[Feifei Wang]

Instead of polling for cbi->use to be updated, use wait until scheme.

Signed-off-by: Feifei Wang <feifei.wang2 at arm.com>
Reviewed-by: Ruifeng Wang <ruifeng.wang at arm.com>
Acked-by: Konstantin Ananyev <konstantin.ananyev at intel.com>
---
 lib/bpf/bpf_pkt.c | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/lib/bpf/bpf_pkt.c b/lib/bpf/bpf_pkt.c
index 6e8248f0d6..000b82d935 100644
--- a/lib/bpf/bpf_pkt.c
+++ b/lib/bpf/bpf_pkt.c
@@ -113,7 +113,7 @@ bpf_eth_cbi_unuse(struct bpf_eth_cbi *cbi)
 static void
 bpf_eth_cbi_wait(const struct bpf_eth_cbi *cbi)
 {
-	uint32_t nuse, puse;
+	uint32_t puse;
 
 	/* make sure all previous loads and stores are completed */
 	rte_smp_mb();
@@ -122,11 +122,8 @@ bpf_eth_cbi_wait(const struct bpf_eth_cbi *cbi)
 
 	/* in use, busy wait till current RX/TX iteration is finished */
 	if ((puse & BPF_ETH_CBI_INUSE) != 0) {
-		do {
-			rte_pause();
-			rte_compiler_barrier();
-			nuse = cbi->use;
-		} while (nuse == puse);
+		RTE_WAIT_UNTIL_MASKED((uint32_t *)(uintptr_t)&cbi->use, UINT32_MAX,
+			!=, puse, __ATOMIC_RELAXED);
 	}
 }
 
-- 
2.25.1