From: Feifei Wang <feifei.wang2@arm.com>
Date: Mon, 1 Nov 2021 06:00:06 +0000 (+0800)
Subject: bpf: use wait until scheme for Rx/Tx iteration
X-Git-Url: http://git.droids-corp.org/?a=commitdiff_plain;h=388bee69a5465d2401ea0054461c190160528e32;p=dpdk.git

bpf: use wait until scheme for Rx/Tx iteration

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

Signed-off-by: Feifei Wang <feifei.wang2@arm.com>
Reviewed-by: Ruifeng Wang <ruifeng.wang@arm.com>
Acked-by: Konstantin Ananyev <konstantin.ananyev@intel.com>
---

diff --git a/lib/bpf/bpf_pkt.c b/lib/bpf/bpf_pkt.c
index 6e8248f0d6..08eebd99b3 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);
 	}
 }