diff mbox series

[v7,4/5] lib/bpf: use wait event scheme for Rx/Tx iteration

Message ID 20211028065640.139655-5-feifei.wang2@arm.com (mailing list archive)
State Superseded, archived
Delegated to: David Marchand
Headers
Series add new definitions for wait scheme |

Checks

Context Check Description
ci/checkpatch success coding style OK

Commit Message

Feifei Wang Oct. 28, 2021, 6:56 a.m. UTC 
  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(-)

Comments

Ananyev, Konstantin Oct. 28, 2021, 1:15 p.m. UTC | #1 
> 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);
>  	}
>  }
> 
> --

Acked-by: Konstantin Ananyev <konstantin.ananyev@intel.com>

> 2.25.1
diff mbox series

Patch

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);
 	}
 }