[dpdk-dev] [PATCH v4 2/3] ring: use wfe to wait for ring tail update on aarch64
From: Ruifeng Wang <hidden>
Date: 2021-07-07 05:49:15
Subsystem:
library code, the rest · Maintainers:
Andrew Morton, Linus Torvalds
Instead of polling for tail to be updated, use wfe instruction. Signed-off-by: Gavin Hu <redacted> Signed-off-by: Ruifeng Wang <redacted> Reviewed-by: Steve Capper <redacted> Reviewed-by: Ola Liljedahl <redacted> Reviewed-by: Honnappa Nagarahalli <redacted> Acked-by: Konstantin Ananyev <redacted> Acked-by: Jerin Jacob <redacted> --- lib/ring/rte_ring_c11_pvt.h | 4 ++-- lib/ring/rte_ring_generic_pvt.h | 3 +-- 2 files changed, 3 insertions(+), 4 deletions(-)
diff --git a/lib/ring/rte_ring_c11_pvt.h b/lib/ring/rte_ring_c11_pvt.h
index 759192f4c4..37e0b2afd6 100644
--- a/lib/ring/rte_ring_c11_pvt.h
+++ b/lib/ring/rte_ring_c11_pvt.h@@ -2,6 +2,7 @@ * * Copyright (c) 2017,2018 HXT-semitech Corporation. * Copyright (c) 2007-2009 Kip Macy kmacy@freebsd.org + * Copyright (c) 2021 Arm Limited * All rights reserved. * Derived from FreeBSD's bufring.h * Used as BSD-3 Licensed with permission from Kip Macy.
@@ -21,8 +22,7 @@ __rte_ring_update_tail(struct rte_ring_headtail *ht, uint32_t old_val, * we need to wait for them to complete */ if (!single) - while (unlikely(ht->tail != old_val)) - rte_pause(); + rte_wait_until_equal_32(&ht->tail, old_val, __ATOMIC_RELAXED); __atomic_store_n(&ht->tail, new_val, __ATOMIC_RELEASE); }
diff --git a/lib/ring/rte_ring_generic_pvt.h b/lib/ring/rte_ring_generic_pvt.h
index 532deb5e7a..c95ad7e12c 100644
--- a/lib/ring/rte_ring_generic_pvt.h
+++ b/lib/ring/rte_ring_generic_pvt.h@@ -23,8 +23,7 @@ __rte_ring_update_tail(struct rte_ring_headtail *ht, uint32_t old_val, * we need to wait for them to complete */ if (!single) - while (unlikely(ht->tail != old_val)) - rte_pause(); + rte_wait_until_equal_32(&ht->tail, old_val, __ATOMIC_RELAXED); ht->tail = new_val; }
--
2.25.1