From patchwork Tue Jan 29 13:51:24 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jason Wang X-Patchwork-Id: 216559 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (Client did not present a certificate) by ozlabs.org (Postfix) with ESMTPS id 193B92C0098 for ; Wed, 30 Jan 2013 01:46:05 +1100 (EST) Received: from localhost ([::1]:60133 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1U0BmL-0003nf-4E for incoming@patchwork.ozlabs.org; Tue, 29 Jan 2013 09:03:13 -0500 Received: from eggs.gnu.org ([208.118.235.92]:51014) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1U0BlG-0002G1-GW for qemu-devel@nongnu.org; Tue, 29 Jan 2013 09:02:11 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1U0BlA-0007Nx-7K for qemu-devel@nongnu.org; Tue, 29 Jan 2013 09:02:05 -0500 Received: from mx1.redhat.com ([209.132.183.28]:21161) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1U0BlA-0007Nr-0D for qemu-devel@nongnu.org; Tue, 29 Jan 2013 09:02:00 -0500 Received: from int-mx12.intmail.prod.int.phx2.redhat.com (int-mx12.intmail.prod.int.phx2.redhat.com [10.5.11.25]) by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id r0TE1kDP023303 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Tue, 29 Jan 2013 09:01:51 -0500 Received: from amd-6168-8-1.englab.nay.redhat.com (amd-6168-8-1.englab.nay.redhat.com [10.66.104.52]) by int-mx12.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id r0TE06tt025703; Tue, 29 Jan 2013 09:01:42 -0500 From: Jason Wang To: mst@redhat.com, qemu-devel@nongnu.org, aliguori@us.ibm.com, shajnocz@redhat.com Date: Tue, 29 Jan 2013 21:51:24 +0800 Message-Id: <1359467492-31704-13-git-send-email-jasowang@redhat.com> In-Reply-To: <1359467492-31704-1-git-send-email-jasowang@redhat.com> References: <1359467492-31704-1-git-send-email-jasowang@redhat.com> X-Scanned-By: MIMEDefang 2.68 on 10.5.11.25 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x X-Received-From: 209.132.183.28 Cc: krkumar2@in.ibm.com, kvm@vger.kernel.org, mprivozn@redhat.com, Jason Wang , rusty@rustcorp.com.au, gaowanlong@cn.fujitsu.com, jwhan@filewood.snu.ac.kr, shiyer@redhat.com Subject: [Qemu-devel] [PATCH V3 12/20] tap: introduce a helper to get the name of an interface X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org This patch introduces a helper tap_get_ifname() to get the device name of tap device. This is needed when ifname is unspecified in the command line and qemu were asked to create tap device by itself. In this situation, the name were allocated by kernel, so if multiqueue is asked, we need to fetch its name after creating the first queue. Only linux has this support since it's the only platform that supports multiqueue tap. Signed-off-by: Jason Wang --- include/net/tap.h | 1 + net/tap-aix.c | 6 ++++++ net/tap-bsd.c | 4 ++++ net/tap-haiku.c | 4 ++++ net/tap-linux.c | 13 +++++++++++++ net/tap-solaris.c | 4 ++++ net/tap_int.h | 1 + 7 files changed, 33 insertions(+), 0 deletions(-) diff --git a/include/net/tap.h b/include/net/tap.h index 0caf8c4..c523ff0 100644 --- a/include/net/tap.h +++ b/include/net/tap.h @@ -37,6 +37,7 @@ void tap_set_offload(NetClientState *nc, int csum, int tso4, int tso6, int ecn, void tap_set_vnet_hdr_len(NetClientState *nc, int len); int tap_enable(NetClientState *nc); int tap_disable(NetClientState *nc); +int tap_get_ifname(NetClientState *nc, char *ifname); int tap_get_fd(NetClientState *nc); diff --git a/net/tap-aix.c b/net/tap-aix.c index 66e0574..e760e9a 100644 --- a/net/tap-aix.c +++ b/net/tap-aix.c @@ -69,3 +69,9 @@ int tap_fd_disable(int fd) { return -1; } + +int tap_fd_get_ifname(int fd, char *ifname) +{ + return -1; +} + diff --git a/net/tap-bsd.c b/net/tap-bsd.c index cfc7a28..4f22109 100644 --- a/net/tap-bsd.c +++ b/net/tap-bsd.c @@ -156,3 +156,7 @@ int tap_fd_disable(int fd) return -1; } +int tap_fd_get_ifname(int fd, char *ifname) +{ + return -1; +} diff --git a/net/tap-haiku.c b/net/tap-haiku.c index 664d40f..b3b5fbb 100644 --- a/net/tap-haiku.c +++ b/net/tap-haiku.c @@ -70,3 +70,7 @@ int tap_fd_disable(int fd) return -1; } +int tap_fd_get_ifname(int fd, char *ifname) +{ + return -1; +} diff --git a/net/tap-linux.c b/net/tap-linux.c index 60ea8d0..6827c2a 100644 --- a/net/tap-linux.c +++ b/net/tap-linux.c @@ -261,3 +261,16 @@ int tap_fd_disable(int fd) return ret; } +int tap_fd_get_ifname(int fd, char *ifname) +{ + struct ifreq ifr; + + if (ioctl(fd, TUNGETIFF, &ifr) != 0) { + error_report("TUNGETIFF ioctl() failed: %s", + strerror(errno)); + return -1; + } + + pstrcpy(ifname, sizeof(ifr.ifr_name), ifr.ifr_name); + return 0; +} diff --git a/net/tap-solaris.c b/net/tap-solaris.c index 12cc392..214d95e 100644 --- a/net/tap-solaris.c +++ b/net/tap-solaris.c @@ -236,3 +236,7 @@ int tap_fd_disable(int fd) return -1; } +int tap_fd_get_ifname(int fd, char *ifname) +{ + return -1; +} diff --git a/net/tap_int.h b/net/tap_int.h index ca1c21b..125f83d 100644 --- a/net/tap_int.h +++ b/net/tap_int.h @@ -44,5 +44,6 @@ void tap_fd_set_offload(int fd, int csum, int tso4, int tso6, int ecn, int ufo); void tap_fd_set_vnet_hdr_len(int fd, int len); int tap_fd_enable(int fd); int tap_fd_disable(int fd); +int tap_fd_get_ifname(int fd, char *ifname); #endif /* QEMU_TAP_H */