From patchwork Wed Jan 30 11:12:31 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jason Wang X-Patchwork-Id: 216867 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 82EED2C0095 for ; Wed, 30 Jan 2013 22:46:56 +1100 (EST) Received: from localhost ([::1]:58894 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1U0W7y-0002xI-Ll for incoming@patchwork.ozlabs.org; Wed, 30 Jan 2013 06:46:54 -0500 Received: from eggs.gnu.org ([208.118.235.92]:60609) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1U0W7p-0002vb-ID for qemu-devel@nongnu.org; Wed, 30 Jan 2013 06:46:47 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1U0W7n-0003Qx-Hd for qemu-devel@nongnu.org; Wed, 30 Jan 2013 06:46:45 -0500 Received: from mx1.redhat.com ([209.132.183.28]:39188) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1U0Vl5-0005Pf-V7 for qemu-devel@nongnu.org; Wed, 30 Jan 2013 06:23:16 -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 r0UBN7Ns023609 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Wed, 30 Jan 2013 06:23:07 -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 r0UBLHRc018213; Wed, 30 Jan 2013 06:23:00 -0500 From: Jason Wang To: aliguori@us.ibm.com, mst@redhat.com, qemu-devel@nongnu.org, blauwirbel@gmail.com, shajnocz@redhat.com Date: Wed, 30 Jan 2013 19:12:31 +0800 Message-Id: <1359544361-5089-13-git-send-email-jasowang@redhat.com> In-Reply-To: <1359544361-5089-1-git-send-email-jasowang@redhat.com> References: <1359544361-5089-1-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, shiyer@redhat.com, jwhan@filewood.snu.ac.kr, gaowanlong@cn.fujitsu.com Subject: [Qemu-devel] [PATCH V4 12/22] tap: add Linux multiqueue support 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 add basic multiqueue support for Linux. When multiqueue is needed, we will first check whether kernel support multiqueue tap before creating more queues. Two new functions tap_fd_enable() and tap_fd_disable() were introduced to enable and disable a specific queue. Since the multiqueue is only supported in Linux, return error on other platforms. Signed-off-by: Jason Wang --- net/tap-aix.c | 10 ++++++++++ net/tap-bsd.c | 11 +++++++++++ net/tap-haiku.c | 11 +++++++++++ net/tap-linux.c | 52 ++++++++++++++++++++++++++++++++++++++++++++++++++++ net/tap-solaris.c | 11 +++++++++++ net/tap_int.h | 2 ++ 6 files changed, 97 insertions(+), 0 deletions(-) diff --git a/net/tap-aix.c b/net/tap-aix.c index aff6c52..66e0574 100644 --- a/net/tap-aix.c +++ b/net/tap-aix.c @@ -59,3 +59,13 @@ void tap_fd_set_offload(int fd, int csum, int tso4, int tso6, int ecn, int ufo) { } + +int tap_fd_enable(int fd) +{ + return -1; +} + +int tap_fd_disable(int fd) +{ + return -1; +} diff --git a/net/tap-bsd.c b/net/tap-bsd.c index 01c705b..cfc7a28 100644 --- a/net/tap-bsd.c +++ b/net/tap-bsd.c @@ -145,3 +145,14 @@ void tap_fd_set_offload(int fd, int csum, int tso4, int tso6, int ecn, int ufo) { } + +int tap_fd_enable(int fd) +{ + return -1; +} + +int tap_fd_disable(int fd) +{ + return -1; +} + diff --git a/net/tap-haiku.c b/net/tap-haiku.c index 08cc034..664d40f 100644 --- a/net/tap-haiku.c +++ b/net/tap-haiku.c @@ -59,3 +59,14 @@ void tap_fd_set_offload(int fd, int csum, int tso4, int tso6, int ecn, int ufo) { } + +int tap_fd_enable(int fd) +{ + return -1; +} + +int tap_fd_disable(int fd) +{ + return -1; +} + diff --git a/net/tap-linux.c b/net/tap-linux.c index 0a6acc7..bdb0a79 100644 --- a/net/tap-linux.c +++ b/net/tap-linux.c @@ -41,6 +41,7 @@ int tap_open(char *ifname, int ifname_size, int *vnet_hdr, int vnet_hdr_required struct ifreq ifr; int fd, ret; int len = sizeof(struct virtio_net_hdr); + int mq_required = 0; TFR(fd = open(PATH_NET_TUN, O_RDWR)); if (fd < 0) { @@ -76,6 +77,20 @@ int tap_open(char *ifname, int ifname_size, int *vnet_hdr, int vnet_hdr_required ioctl(fd, TUNSETVNETHDRSZ, &len); } + if (mq_required) { + unsigned int features; + + if ((ioctl(fd, TUNGETFEATURES, &features) != 0) || + !(features & IFF_MULTI_QUEUE)) { + error_report("multiqueue required, but no kernel " + "support for IFF_MULTI_QUEUE available"); + close(fd); + return -1; + } else { + ifr.ifr_flags |= IFF_MULTI_QUEUE; + } + } + if (ifname[0] != '\0') pstrcpy(ifr.ifr_name, IFNAMSIZ, ifname); else @@ -209,3 +224,40 @@ void tap_fd_set_offload(int fd, int csum, int tso4, } } } + +/* Enable a specific queue of tap. */ +int tap_fd_enable(int fd) +{ + struct ifreq ifr; + int ret; + + memset(&ifr, 0, sizeof(ifr)); + + ifr.ifr_flags = IFF_ATTACH_QUEUE; + ret = ioctl(fd, TUNSETQUEUE, (void *) &ifr); + + if (ret != 0) { + error_report("could not enable queue"); + } + + return ret; +} + +/* Disable a specific queue of tap/ */ +int tap_fd_disable(int fd) +{ + struct ifreq ifr; + int ret; + + memset(&ifr, 0, sizeof(ifr)); + + ifr.ifr_flags = IFF_DETACH_QUEUE; + ret = ioctl(fd, TUNSETQUEUE, (void *) &ifr); + + if (ret != 0) { + error_report("could not disable queue"); + } + + return ret; +} + diff --git a/net/tap-solaris.c b/net/tap-solaris.c index 486a7ea..12cc392 100644 --- a/net/tap-solaris.c +++ b/net/tap-solaris.c @@ -225,3 +225,14 @@ void tap_fd_set_offload(int fd, int csum, int tso4, int tso6, int ecn, int ufo) { } + +int tap_fd_enable(int fd) +{ + return -1; +} + +int tap_fd_disable(int fd) +{ + return -1; +} + diff --git a/net/tap_int.h b/net/tap_int.h index 1dffe12..ca1c21b 100644 --- a/net/tap_int.h +++ b/net/tap_int.h @@ -42,5 +42,7 @@ int tap_probe_vnet_hdr_len(int fd, int len); int tap_probe_has_ufo(int fd); 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); #endif /* QEMU_TAP_H */