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From: Feifei Wang <feifei.wang2@arm.com>
To: Konstantin Ananyev <konstantin.ananyev@intel.com>,
	Ferruh Yigit <ferruh.yigit@intel.com>
Cc: dev@dpdk.org, nd@arm.com, Feifei Wang <feifei.wang2@arm.com>,
	stable@dpdk.org, Ruifeng Wang <ruifeng.wang@arm.com>
Subject: [dpdk-stable] [RFC PATCH v2 4/5] lib/bpf: use wait event scheme for Rx/Tx iteration
Date: Thu, 23 Sep 2021 17:59:01 +0800
Message-ID: <20210923095902.301762-5-feifei.wang2@arm.com> (raw)
In-Reply-To: <20210923095902.301762-1-feifei.wang2@arm.com>

First, fix the bug that keyword const of func arg should be after "*".
This is because const before "*" means the value of "cbi" should not be
changed. But we should monitor that cbi->use changed and then we can
jump out of loop.

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

Fixes: a93ff62a8938 ("bpf: introduce basic Rx/Tx filters")
Cc: konstantin.ananyev@intel.com
Cc: stable@dpdk.org

Signed-off-by: Feifei Wang <feifei.wang2@arm.com>
Reviewed-by: Ruifeng Wang <ruifeng.wang@arm.com>
---
 lib/bpf/bpf_pkt.c | 11 ++++-------
 1 file changed, 4 insertions(+), 7 deletions(-)

diff --git a/lib/bpf/bpf_pkt.c b/lib/bpf/bpf_pkt.c
index 6e8248f0d6..08ed8ff68c 100644
--- a/lib/bpf/bpf_pkt.c
+++ b/lib/bpf/bpf_pkt.c
@@ -111,9 +111,9 @@ bpf_eth_cbi_unuse(struct bpf_eth_cbi *cbi)
  * Waits till datapath finished using given callback.
  */
 static void
-bpf_eth_cbi_wait(const struct bpf_eth_cbi *cbi)
+bpf_eth_cbi_wait(struct bpf_eth_cbi *const 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


  parent reply	other threads:[~2021-09-23  9:59 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20210902053253.3017858-1-feifei.wang2@arm.com>
2021-09-02  5:32 ` [dpdk-stable] [RFC PATCH v1 4/5] lib/bpf: use wait until " Feifei Wang
     [not found] ` <20210923095902.301762-1-feifei.wang2@arm.com>
2021-09-23  9:59   ` Feifei Wang [this message]
2021-09-24 18:07     ` [dpdk-stable] [RFC PATCH v2 4/5] lib/bpf: use wait event " Ananyev, Konstantin
2021-09-26  2:19       ` [dpdk-stable] 回复: " Feifei Wang

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