From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: <dev-bounces@dpdk.org> Received: from dpdk.org (dpdk.org [92.243.14.124]) by inbox.dpdk.org (Postfix) with ESMTP id BFDAFA046B for <public@inbox.dpdk.org>; Thu, 22 Aug 2019 08:14:03 +0200 (CEST) Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id 22B351BF6B; Thu, 22 Aug 2019 08:13:41 +0200 (CEST) Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by dpdk.org (Postfix) with ESMTP id AF6431BF50 for <dev@dpdk.org>; Thu, 22 Aug 2019 08:13:37 +0200 (CEST) Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 37B8B344; Wed, 21 Aug 2019 23:13:37 -0700 (PDT) Received: from net-arm-thunderx2-01.test.ast.arm.com (net-arm-thunderx2-01.shanghai.arm.com [10.169.40.40]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 3EC813F706; Wed, 21 Aug 2019 23:15:53 -0700 (PDT) From: Gavin Hu <gavin.hu@arm.com> To: dev@dpdk.org Cc: nd@arm.com, thomas@monjalon.net, stephen@networkplumber.org, jerinj@marvell.com, pbhagavatula@marvell.com, Honnappa.Nagarahalli@arm.com Date: Thu, 22 Aug 2019 14:12:34 +0800 Message-Id: <1566454356-37277-5-git-send-email-gavin.hu@arm.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1566454356-37277-1-git-send-email-gavin.hu@arm.com> References: <1566454356-37277-1-git-send-email-gavin.hu@arm.com> In-Reply-To: <1561911676-37718-1-git-send-email-gavin.hu@arm.com> References: <1561911676-37718-1-git-send-email-gavin.hu@arm.com> Subject: [dpdk-dev] [PATCH v4 4/6] ring: use wfe to wait for ring tail update on aarch64 X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions <dev.dpdk.org> List-Unsubscribe: <https://mails.dpdk.org/options/dev>, <mailto:dev-request@dpdk.org?subject=unsubscribe> List-Archive: <http://mails.dpdk.org/archives/dev/> List-Post: <mailto:dev@dpdk.org> List-Help: <mailto:dev-request@dpdk.org?subject=help> List-Subscribe: <https://mails.dpdk.org/listinfo/dev>, <mailto:dev-request@dpdk.org?subject=subscribe> Errors-To: dev-bounces@dpdk.org Sender: "dev" <dev-bounces@dpdk.org> Instead of polling for tail to be updated, use wfe instruction. Signed-off-by: Gavin Hu <gavin.hu@arm.com> Reviewed-by: Ruifeng Wang <ruifeng.wang@arm.com> Reviewed-by: Steve Capper <steve.capper@arm.com> Reviewed-by: Ola Liljedahl <ola.liljedahl@arm.com> Reviewed-by: Honnappa Nagarahalli <honnappa.nagarahalli@arm.com> --- lib/librte_ring/rte_ring_c11_mem.h | 4 ++-- lib/librte_ring/rte_ring_generic.h | 3 +-- 2 files changed, 3 insertions(+), 4 deletions(-) diff --git a/lib/librte_ring/rte_ring_c11_mem.h b/lib/librte_ring/rte_ring_c11_mem.h index 0fb73a3..764d8f1 100644 --- a/lib/librte_ring/rte_ring_c11_mem.h +++ b/lib/librte_ring/rte_ring_c11_mem.h @@ -2,6 +2,7 @@ * * Copyright (c) 2017,2018 HXT-semitech Corporation. * Copyright (c) 2007-2009 Kip Macy kmacy@freebsd.org + * Copyright (c) 2019 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 @@ update_tail(struct rte_ring_headtail *ht, uint32_t old_val, uint32_t new_val, * we need to wait for them to complete */ if (!single) - while (unlikely(ht->tail != old_val)) - rte_pause(); + rte_wait_until_equal_relaxed_32(&ht->tail, old_val); __atomic_store_n(&ht->tail, new_val, __ATOMIC_RELEASE); } diff --git a/lib/librte_ring/rte_ring_generic.h b/lib/librte_ring/rte_ring_generic.h index 953cdbb..6828527 100644 --- a/lib/librte_ring/rte_ring_generic.h +++ b/lib/librte_ring/rte_ring_generic.h @@ -23,8 +23,7 @@ update_tail(struct rte_ring_headtail *ht, uint32_t old_val, uint32_t new_val, * we need to wait for them to complete */ if (!single) - while (unlikely(ht->tail != old_val)) - rte_pause(); + rte_wait_until_equal_relaxed_32(&ht->tail, old_val); ht->tail = new_val; } -- 2.7.4