From nobody Sun Feb 8 22:58:00 2026 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass(p=none dis=none) header.from=redhat.com ARC-Seal: i=1; a=rsa-sha256; t=1684263846; cv=none; d=zohomail.com; s=zohoarc; b=K9TgZ/f8OIWLy+bx2/U0anhET2LLiC4m7s8lGEBhUgY1bg4V26VzrA4gXEPX15jqc1rxB3K93nJ4aE/6UC1XF7b6/APtPo6/FD7m1V8FQGl2vcFZF/+BBkkLc2jf+SlR5obP5xHJ0fBQXEqdJSQns14NzP1lvHcMrbkMhtmRhJ8= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1684263846; h=Content-Type:Content-Transfer-Encoding:Cc:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:To; bh=QN5dUSHOXHxwuqPaPoFoBIoQO1wy9z42Wgl8ufTpgyA=; b=VRJwX51Lmb6Im2XCYb6k5VvSug93+x0hcCX9d+gKsWsWxgprV5EnfsPh932im8vU5oQEaFNaj2yrkTzcoZ/iCUJ1LsL4s6TeHXx8/qzQTPqMhRDDaiYQrtSdQdhlBJL6uLk05L+XcA51PWdlYg7ZJSGPxfJscjFbs75hFfw7inA= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass header.from= (p=none dis=none) Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1684263846647113.53779543808525; Tue, 16 May 2023 12:04:06 -0700 (PDT) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1pyzx5-0001tc-Vm; Tue, 16 May 2023 15:03:16 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1pyzx3-0001sU-HT for qemu-devel@nongnu.org; Tue, 16 May 2023 15:03:13 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1pyzx0-0001CL-GJ for qemu-devel@nongnu.org; Tue, 16 May 2023 15:03:13 -0400 Received: from mimecast-mx02.redhat.com (mx3-rdu2.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-631-OBDdMVeVNAuZ1qrl1VHmbQ-1; Tue, 16 May 2023 15:03:05 -0400 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.rdu2.redhat.com [10.11.54.6]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 58E9329A9D28; Tue, 16 May 2023 19:03:04 +0000 (UTC) Received: from localhost (unknown [10.39.192.44]) by smtp.corp.redhat.com (Postfix) with ESMTP id 647022166B32; Tue, 16 May 2023 19:03:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1684263789; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=QN5dUSHOXHxwuqPaPoFoBIoQO1wy9z42Wgl8ufTpgyA=; b=IToU7KDQZoXSKpc6ITbBO0qeeMzotEQxEyqVaVpg9RZvjAi3X8aOJ+v0S0holBxlaMvwOg FpF8kwFyqOND6coAGW7Y/irUGSZs1v3hEPYK37l1mvtzlU1vgMrpaQoA+1377F5WUlMJ4h QE4z/UxEuECMB6iBmYrlaeQpUKldWCY= X-MC-Unique: OBDdMVeVNAuZ1qrl1VHmbQ-1 From: Stefan Hajnoczi To: qemu-devel@nongnu.org Cc: Coiby Xu , Marcel Apfelbaum , "Michael S. Tsirkin" , "Richard W.M. Jones" , Peter Xu , xen-devel@lists.xenproject.org, Kevin Wolf , Ronnie Sahlberg , Stefano Stabellini , Richard Henderson , Stefan Hajnoczi , Julia Suvorova , Hanna Reitz , Leonardo Bras , eesposit@redhat.com, Fam Zheng , Aarushi Mehta , David Woodhouse , Xie Yongji , Stefano Garzarella , qemu-block@nongnu.org, Eduardo Habkost , Paul Durrant , Stefan Weil , Anthony Perard , =?UTF-8?q?Daniel=20P=2E=20Berrang=C3=A9?= , Peter Lieven , Paolo Bonzini , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , Juan Quintela Subject: [PATCH v6 05/20] util/vhost-user-server: rename refcount to in_flight counter Date: Tue, 16 May 2023 15:02:23 -0400 Message-Id: <20230516190238.8401-6-stefanha@redhat.com> In-Reply-To: <20230516190238.8401-1-stefanha@redhat.com> References: <20230516190238.8401-1-stefanha@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.1 on 10.11.54.6 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.129.124; envelope-from=stefanha@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1684263847688100006 The VuServer object has a refcount field and ref/unref APIs. The name is confusing because it's actually an in-flight request counter instead of a refcount. Normally a refcount destroys the object upon reaching zero. The VuServer counter is used to wake up the vhost-user coroutine when there are no more requests. Avoid confusing by renaming refcount and ref/unref to in_flight and inc/dec. Reviewed-by: Paolo Bonzini Reviewed-by: Philippe Mathieu-Daud=C3=A9 Signed-off-by: Stefan Hajnoczi Reviewed-by: Kevin Wolf --- include/qemu/vhost-user-server.h | 6 +++--- block/export/vhost-user-blk-server.c | 11 +++++++---- util/vhost-user-server.c | 14 +++++++------- 3 files changed, 17 insertions(+), 14 deletions(-) diff --git a/include/qemu/vhost-user-server.h b/include/qemu/vhost-user-ser= ver.h index 25c72433ca..bc0ac9ddb6 100644 --- a/include/qemu/vhost-user-server.h +++ b/include/qemu/vhost-user-server.h @@ -41,7 +41,7 @@ typedef struct { const VuDevIface *vu_iface; =20 /* Protected by ctx lock */ - unsigned int refcount; + unsigned int in_flight; bool wait_idle; VuDev vu_dev; QIOChannel *ioc; /* The I/O channel with the client */ @@ -60,8 +60,8 @@ bool vhost_user_server_start(VuServer *server, =20 void vhost_user_server_stop(VuServer *server); =20 -void vhost_user_server_ref(VuServer *server); -void vhost_user_server_unref(VuServer *server); +void vhost_user_server_inc_in_flight(VuServer *server); +void vhost_user_server_dec_in_flight(VuServer *server); =20 void vhost_user_server_attach_aio_context(VuServer *server, AioContext *ct= x); void vhost_user_server_detach_aio_context(VuServer *server); diff --git a/block/export/vhost-user-blk-server.c b/block/export/vhost-user= -blk-server.c index e56b92f2e2..841acb36e3 100644 --- a/block/export/vhost-user-blk-server.c +++ b/block/export/vhost-user-blk-server.c @@ -50,7 +50,10 @@ static void vu_blk_req_complete(VuBlkReq *req, size_t in= _len) free(req); } =20 -/* Called with server refcount increased, must decrease before returning */ +/* + * Called with server in_flight counter increased, must decrease before + * returning. + */ static void coroutine_fn vu_blk_virtio_process_req(void *opaque) { VuBlkReq *req =3D opaque; @@ -68,12 +71,12 @@ static void coroutine_fn vu_blk_virtio_process_req(void= *opaque) in_num, out_num); if (in_len < 0) { free(req); - vhost_user_server_unref(server); + vhost_user_server_dec_in_flight(server); return; } =20 vu_blk_req_complete(req, in_len); - vhost_user_server_unref(server); + vhost_user_server_dec_in_flight(server); } =20 static void vu_blk_process_vq(VuDev *vu_dev, int idx) @@ -95,7 +98,7 @@ static void vu_blk_process_vq(VuDev *vu_dev, int idx) Coroutine *co =3D qemu_coroutine_create(vu_blk_virtio_process_req, req); =20 - vhost_user_server_ref(server); + vhost_user_server_inc_in_flight(server); qemu_coroutine_enter(co); } } diff --git a/util/vhost-user-server.c b/util/vhost-user-server.c index 5b6216069c..1622f8cfb3 100644 --- a/util/vhost-user-server.c +++ b/util/vhost-user-server.c @@ -75,16 +75,16 @@ static void panic_cb(VuDev *vu_dev, const char *buf) error_report("vu_panic: %s", buf); } =20 -void vhost_user_server_ref(VuServer *server) +void vhost_user_server_inc_in_flight(VuServer *server) { assert(!server->wait_idle); - server->refcount++; + server->in_flight++; } =20 -void vhost_user_server_unref(VuServer *server) +void vhost_user_server_dec_in_flight(VuServer *server) { - server->refcount--; - if (server->wait_idle && !server->refcount) { + server->in_flight--; + if (server->wait_idle && !server->in_flight) { aio_co_wake(server->co_trip); } } @@ -192,13 +192,13 @@ static coroutine_fn void vu_client_trip(void *opaque) /* Keep running */ } =20 - if (server->refcount) { + if (server->in_flight) { /* Wait for requests to complete before we can unmap the memory */ server->wait_idle =3D true; qemu_coroutine_yield(); server->wait_idle =3D false; } - assert(server->refcount =3D=3D 0); + assert(server->in_flight =3D=3D 0); =20 vu_deinit(vu_dev); =20 --=20 2.40.1