Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757682AbaFZCJR (ORCPT ); Wed, 25 Jun 2014 22:09:17 -0400 Received: from mail-pd0-f174.google.com ([209.85.192.174]:45933 "EHLO mail-pd0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757605AbaFZCJM (ORCPT ); Wed, 25 Jun 2014 22:09:12 -0400 From: Ming Lei To: Jens Axboe , linux-kernel@vger.kernel.org Cc: Rusty Russell , linux-api@vger.kernel.org, virtualization@lists.linux-foundation.org, "Michael S. Tsirkin" , Stefan Hajnoczi , Paolo Bonzini , Ming Lei Subject: [PATCH v2 1/2] include/uapi/linux/virtio_blk.h: introduce feature of VIRTIO_BLK_F_MQ Date: Thu, 26 Jun 2014 10:08:45 +0800 Message-Id: <1403748526-1923-2-git-send-email-ming.lei@canonical.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1403748526-1923-1-git-send-email-ming.lei@canonical.com> References: <1403748526-1923-1-git-send-email-ming.lei@canonical.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Current virtio-blk spec only supports one virtual queue for transfering data between VM and host, and inside VM all kinds of operations on the virtual queue needs to hold one lock, so cause below problems: - bad scalability - bad throughput This patch requests to introduce feature of VIRTIO_BLK_F_MQ so that more than one virtual queues can be used to virtio-blk device, then above problems can be solved or eased. Signed-off-by: Ming Lei --- include/uapi/linux/virtio_blk.h | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/include/uapi/linux/virtio_blk.h b/include/uapi/linux/virtio_blk.h index 6d8e61c..9ad67b2 100644 --- a/include/uapi/linux/virtio_blk.h +++ b/include/uapi/linux/virtio_blk.h @@ -40,6 +40,7 @@ #define VIRTIO_BLK_F_WCE 9 /* Writeback mode enabled after reset */ #define VIRTIO_BLK_F_TOPOLOGY 10 /* Topology information is available */ #define VIRTIO_BLK_F_CONFIG_WCE 11 /* Writeback mode available in config */ +#define VIRTIO_BLK_F_MQ 12 /* support more than one vq */ #ifndef __KERNEL__ /* Old (deprecated) name for VIRTIO_BLK_F_WCE. */ @@ -77,6 +78,10 @@ struct virtio_blk_config { /* writeback mode (if VIRTIO_BLK_F_CONFIG_WCE) */ __u8 wce; + __u8 unused; + + /* number of vqs, only available when VIRTIO_BLK_F_MQ is set */ + __u16 num_queues; } __attribute__((packed)); /* -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/