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From: Feifei Wang <feifei.wang2@arm.com>
To: Konstantin Ananyev <konstantin.ananyev@intel.com>
Cc: dev@dpdk.org, nd@arm.com, jerinjacobk@gmail.com,
stephen@networkplumber.org, david.marchand@redhat.com, thomas@monjalon.net,
mattias.ronnblom@ericsson.com, Feifei Wang <feifei.wang2@arm.com>,
Ruifeng Wang <ruifeng.wang@arm.com>
Date: Thu, 28 Oct 2021 14:56:39 +0800
Message-Id: <20211028065640.139655-5-feifei.wang2@arm.com>
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<20211028065640.139655-1-feifei.wang2@arm.com>
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Subject: [dpdk-dev] [PATCH v7 4/5] lib/bpf: use wait event scheme for Rx/Tx
iteration
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Instead of polling for cbi->use to be updated, use wait event scheme.
Signed-off-by: Feifei Wang <feifei.wang2@arm.com>
Reviewed-by: Ruifeng Wang <ruifeng.wang@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..c8a1cd1eb8 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_event((uint32_t *)(uintptr_t)&cbi->use, UINT32_MAX,
+ ==, puse, __ATOMIC_RELAXED);
}
}
--
2.25.1