[dpdk-dev] [RFC PATCH v3 4/5] lib/bpf: use wait event scheme for Rx/Tx iteration
From: Feifei Wang <hidden>
Date: 2021-09-26 06:33:37
Subsystem:
library code, the rest · Maintainers:
Andrew Morton, Linus Torvalds
Instead of polling for cbi->use to be updated, use wait event scheme. Signed-off-by: Feifei Wang <redacted> Reviewed-by: Ruifeng Wang <redacted> --- 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