From patchwork Tue Jan 9 16:40:11 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Zhoujian (jay)" X-Patchwork-Id: 857635 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (mailfrom) smtp.mailfrom=nongnu.org (client-ip=2001:4830:134:3::11; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Received: from lists.gnu.org (lists.gnu.org [IPv6:2001:4830:134:3::11]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 3zGHz80LDzz9s7g for ; Wed, 10 Jan 2018 03:44:04 +1100 (AEDT) Received: from localhost ([::1]:33492 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1eYx0M-00032c-4j for incoming@patchwork.ozlabs.org; Tue, 09 Jan 2018 11:44:02 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:38520) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1eYwy4-0001fE-TQ for qemu-devel@nongnu.org; Tue, 09 Jan 2018 11:41:41 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1eYwy0-00067U-6M for qemu-devel@nongnu.org; Tue, 09 Jan 2018 11:41:40 -0500 Received: from szxga04-in.huawei.com ([45.249.212.190]:2143 helo=huawei.com) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1eYwxz-00062C-Oj for qemu-devel@nongnu.org; Tue, 09 Jan 2018 11:41:36 -0500 Received: from DGGEMS405-HUB.china.huawei.com (unknown [172.30.72.60]) by Forcepoint Email with ESMTP id E480512DDBDAE; Wed, 10 Jan 2018 00:41:21 +0800 (CST) Received: from localhost (10.177.19.14) by DGGEMS405-HUB.china.huawei.com (10.3.19.205) with Microsoft SMTP Server id 14.3.361.1; Wed, 10 Jan 2018 00:41:14 +0800 From: Jay Zhou To: Date: Wed, 10 Jan 2018 00:40:11 +0800 Message-ID: <1515516013-16604-1-git-send-email-jianjay.zhou@huawei.com> X-Mailer: git-send-email 2.6.1.windows.1 MIME-Version: 1.0 X-Originating-IP: [10.177.19.14] X-CFilter-Loop: Reflected X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x [fuzzy] X-Received-From: 45.249.212.190 Subject: [Qemu-devel] [PATCH v5 2/4][RFC] tap: do not close fd if only vhost failed to initialize X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: weidong.huang@huawei.com, mst@redhat.com, wangxinxin.wang@huawei.com, arei.gonglei@huawei.com, jianjay.zhou@huawei.com, imammedo@redhat.com, liuzhe13@huawei.com Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" Making the followed up device_add to fall back to userspace virtio when netdev_add fails if vhost force flag does not set. Suggested-by: Michael S. Tsirkin Suggested-by: Igor Mammedov Signed-off-by: Jay Zhou --- net/tap.c | 25 ++++++++++++++++++------- 1 file changed, 18 insertions(+), 7 deletions(-) diff --git a/net/tap.c b/net/tap.c index 979e622..03f226f 100644 --- a/net/tap.c +++ b/net/tap.c @@ -642,7 +642,8 @@ static void net_init_tap_one(const NetdevTapOptions *tap, NetClientState *peer, const char *model, const char *name, const char *ifname, const char *script, const char *downscript, const char *vhostfdname, - int vnet_hdr, int fd, Error **errp) + int vnet_hdr, int fd, Error **errp, + bool *vhost_init_failed) { Error *err = NULL; TAPState *s = net_tap_fd_init(peer, model, name, fd, vnet_hdr); @@ -687,6 +688,7 @@ static void net_init_tap_one(const NetdevTapOptions *tap, NetClientState *peer, vhostfd = monitor_fd_param(cur_mon, vhostfdname, &err); if (vhostfd == -1) { error_propagate(errp, err); + *vhost_init_failed = true; return; } } else { @@ -694,6 +696,7 @@ static void net_init_tap_one(const NetdevTapOptions *tap, NetClientState *peer, if (vhostfd < 0) { error_setg_errno(errp, errno, "tap: open vhost char device failed"); + *vhost_init_failed = true; return; } fcntl(vhostfd, F_SETFL, O_NONBLOCK); @@ -704,6 +707,7 @@ static void net_init_tap_one(const NetdevTapOptions *tap, NetClientState *peer, if (!s->vhost_net) { error_setg(errp, "vhost-net requested but could not be initialized"); + *vhost_init_failed = true; return; } } else if (vhostfdname) { @@ -748,6 +752,7 @@ int net_init_tap(const Netdev *netdev, const char *name, Error *err = NULL; const char *vhostfdname; char ifname[128]; + bool vhost_init_failed = false; assert(netdev->type == NET_CLIENT_DRIVER_TAP); tap = &netdev->u.tap; @@ -783,7 +788,7 @@ int net_init_tap(const Netdev *netdev, const char *name, net_init_tap_one(tap, peer, "tap", name, NULL, script, downscript, - vhostfdname, vnet_hdr, fd, &err); + vhostfdname, vnet_hdr, fd, &err, &vhost_init_failed); if (err) { error_propagate(errp, err); return -1; @@ -835,7 +840,7 @@ int net_init_tap(const Netdev *netdev, const char *name, net_init_tap_one(tap, peer, "tap", name, ifname, script, downscript, tap->has_vhostfds ? vhost_fds[i] : NULL, - vnet_hdr, fd, &err); + vnet_hdr, fd, &err, &vhost_init_failed); if (err) { error_propagate(errp, err); goto free_fail; @@ -874,10 +879,12 @@ free_fail: net_init_tap_one(tap, peer, "bridge", name, ifname, script, downscript, vhostfdname, - vnet_hdr, fd, &err); + vnet_hdr, fd, &err, &vhost_init_failed); if (err) { error_propagate(errp, err); - close(fd); + if (tap->has_vhostforce && tap->vhostforce && vhost_init_failed) { + close(fd); + } return -1; } } else { @@ -913,10 +920,14 @@ free_fail: net_init_tap_one(tap, peer, "tap", name, ifname, i >= 1 ? "no" : script, i >= 1 ? "no" : downscript, - vhostfdname, vnet_hdr, fd, &err); + vhostfdname, vnet_hdr, fd, &err, + &vhost_init_failed); if (err) { error_propagate(errp, err); - close(fd); + if (tap->has_vhostforce && tap->vhostforce && + vhost_init_failed) { + close(fd); + } return -1; } }