[dpdk-dev] [RFC PATCH v3 4/5] lib/bpf: use wait event scheme for Rx/Tx iteration

[Feifei Wang]

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

Signed-off-by: Feifei Wang <feifei.wa...@arm.com>
Reviewed-by: Ruifeng Wang <ruifeng.w...@arm.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..3af15ae97b 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_compiler_barrier();
+               rte_wait_event_32(&cbi->use, UINT_MAX, puse, ==, 
__ATOMIC_RELAXED);
        }
 }
 
-- 
2.25.1