From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mails.dpdk.org (mails.dpdk.org [217.70.189.124]) by inbox.dpdk.org (Postfix) with ESMTP id 10B56A0501; Mon, 28 Mar 2022 14:18:52 +0200 (CEST) Received: from [217.70.189.124] (localhost [127.0.0.1]) by mails.dpdk.org (Postfix) with ESMTP id 012B242880; Mon, 28 Mar 2022 14:18:52 +0200 (CEST) Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by mails.dpdk.org (Postfix) with ESMTP id 760AC41104 for ; Mon, 28 Mar 2022 14:18:50 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1648469930; 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=fIkl5t5r6G/U+xVmXJurnpkXlWG5lPaLX2htjlnLEFE=; b=MF8Z8v/CPwNkj1dB+rQbr1FSCJBVAWSiSD9DSuSZrlkcW1dTbV2XkNzrctZIBIYAgjMiyG 6KDAjlo42fYtI+q/8TmpaM2eeDKBVEKz+MsatZoU4P+Lxub4say04pdrRFGlE9xSNcpF5D h0Nq6N+H3lSMeqHyRUKS7F/jHzCPM0c= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-272-gsDjG94sP6STym-V7HFinA-1; Mon, 28 Mar 2022 08:18:46 -0400 X-MC-Unique: gsDjG94sP6STym-V7HFinA-1 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.rdu2.redhat.com [10.11.54.8]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 2D0B0101AA46; Mon, 28 Mar 2022 12:18:46 +0000 (UTC) Received: from dmarchan.remote.csb (unknown [10.40.195.27]) by smtp.corp.redhat.com (Postfix) with ESMTP id D5848C15D40; Mon, 28 Mar 2022 12:18:44 +0000 (UTC) From: David Marchand To: dev@dpdk.org Cc: maxime.coquelin@redhat.com, chenbo.xia@intel.com, stable@dpdk.org, Patrick Fu , Jiayu Hu Subject: [RFC PATCH 3/5] vhost: fix async access Date: Mon, 28 Mar 2022 14:17:56 +0200 Message-Id: <20220328121758.26632-4-david.marchand@redhat.com> In-Reply-To: <20220328121758.26632-1-david.marchand@redhat.com> References: <20220328121758.26632-1-david.marchand@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.85 on 10.11.54.8 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=david.marchand@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset="US-ASCII"; x-default=true X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org vq->async is protected with vq->access_lock. Fixes: eb666d24085f ("vhost: fix async unregister deadlock") Fixes: 0c0935c5f794 ("vhost: allow to check in-flight packets for async vhost") Cc: stable@dpdk.org Signed-off-by: David Marchand --- This has been reported by Jiayu too: https://patchwork.dpdk.org/project/dpdk/patch/20220328020754.1155063-1-jiayu.hu@intel.com/ --- lib/vhost/vhost.c | 25 ++++++++++--------------- 1 file changed, 10 insertions(+), 15 deletions(-) diff --git a/lib/vhost/vhost.c b/lib/vhost/vhost.c index 863cd9131e..9e6ca506ff 100644 --- a/lib/vhost/vhost.c +++ b/lib/vhost/vhost.c @@ -1753,27 +1753,23 @@ rte_vhost_async_channel_unregister(int vid, uint16_t queue_id) if (vq == NULL) return ret; - ret = 0; - - if (!vq->async) - return ret; - if (vhost_spinlock_trylock(&vq->access_lock) == 0) { VHOST_LOG_CONFIG(ERR, "(%s) failed to unregister async channel, virtqueue busy.\n", dev->ifname); - return -1; + return ret; } - if (vq->async->pkts_inflight_n) { + if (!vq->async) { + ret = 0; + } else if (vq->async->pkts_inflight_n) { VHOST_LOG_CONFIG(ERR, "(%s) failed to unregister async channel.\n", dev->ifname); VHOST_LOG_CONFIG(ERR, "(%s) inflight packets must be completed before unregistration.\n", dev->ifname); - ret = -1; - goto out; + } else { + vhost_free_async_mem(vq); + ret = 0; } - vhost_free_async_mem(vq); -out: vhost_spinlock_unlock(&vq->access_lock); return ret; @@ -1891,9 +1887,6 @@ rte_vhost_async_get_inflight(int vid, uint16_t queue_id) if (vq == NULL) return ret; - if (!vq->async) - return ret; - if (vhost_spinlock_trylock(&vq->access_lock) == 0) { VHOST_LOG_CONFIG(DEBUG, "(%s) failed to check in-flight packets. virtqueue busy.\n", @@ -1901,7 +1894,9 @@ rte_vhost_async_get_inflight(int vid, uint16_t queue_id) return ret; } - ret = vq->async->pkts_inflight_n; + if (vq->async) + ret = vq->async->pkts_inflight_n; + vhost_spinlock_unlock(&vq->access_lock); return ret; -- 2.23.0