From patchwork Fri Sep 9 08:57:09 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Zhu, Lingshan" X-Patchwork-Id: 12971275 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id D7993C6FA86 for ; Fri, 9 Sep 2022 09:06:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231649AbiIIJGO (ORCPT ); Fri, 9 Sep 2022 05:06:14 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59558 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231613AbiIIJFr (ORCPT ); Fri, 9 Sep 2022 05:05:47 -0400 Received: from mga12.intel.com (mga12.intel.com [192.55.52.136]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CEE8511B74E; Fri, 9 Sep 2022 02:05:25 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1662714325; x=1694250325; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=I1wAmxOcPfTi3B2DbPxtZHesyzp0WOBwfWf6hCQ2Hy4=; b=jdSv++fP2wnxy30TUALmqT7aAi+EFD99g1MbgwqHoXrQE1QsAmWgqV75 QQ3Jjr1lfEE6vS7s3jCPg8ZeKrrfkpzama/rn7MgKY3KYEVmft5qOPlHh X1KWNRL0o+xsCWH4+YfmpEakE/FiKTLPSz80G9+M6BSFrRLxlsL//t8ra q8js07p74kPnTlSuHbZjjbdPjYK2ZyjknM4671pcxNZq+kD72O/1IO9LX ipRTUV15wZSWWO7JI+/tbdw+6FtqGMr1gXaosh2lKgOq5iatEmo0TITiJ s0hqrzLzKCpD8Qlul7lvlFEsZubcf/mSs56hlOo5uVRPZvQS3VqwR1HvL A==; X-IronPort-AV: E=McAfee;i="6500,9779,10464"; a="277165795" X-IronPort-AV: E=Sophos;i="5.93,302,1654585200"; d="scan'208";a="277165795" Received: from orsmga006.jf.intel.com ([10.7.209.51]) by fmsmga106.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 09 Sep 2022 02:05:25 -0700 X-IronPort-AV: E=Sophos;i="5.93,302,1654585200"; d="scan'208";a="592540342" Received: from unknown (HELO localhost.localdomain.bj.intel.com) ([10.240.193.73]) by orsmga006-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 09 Sep 2022 02:05:23 -0700 From: Zhu Lingshan To: jasowang@redhat.com, mst@redhat.com Cc: virtualization@lists.linux-foundation.org, netdev@vger.kernel.org, kvm@vger.kernel.org, Zhu Lingshan Subject: [PATCH 1/4] vDPA: allow userspace to query features of a vDPA device Date: Fri, 9 Sep 2022 16:57:09 +0800 Message-Id: <20220909085712.46006-2-lingshan.zhu@intel.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20220909085712.46006-1-lingshan.zhu@intel.com> References: <20220909085712.46006-1-lingshan.zhu@intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org This commit adds a new vDPA netlink attribution VDPA_ATTR_VDPA_DEV_SUPPORTED_FEATURES. Userspace can query features of vDPA devices through this new attr. This commit invokes vdpa_config_ops.get_config() than vdpa_get_config_unlocked() to read the device config spcae, so no raeces in vdpa_set_features_unlocked() Signed-off-by: Zhu Lingshan --- drivers/vdpa/vdpa.c | 19 ++++++++++++++----- include/uapi/linux/vdpa.h | 4 ++++ 2 files changed, 18 insertions(+), 5 deletions(-) diff --git a/drivers/vdpa/vdpa.c b/drivers/vdpa/vdpa.c index c06c02704461..798a02c7aa94 100644 --- a/drivers/vdpa/vdpa.c +++ b/drivers/vdpa/vdpa.c @@ -491,6 +491,8 @@ static int vdpa_mgmtdev_fill(const struct vdpa_mgmt_dev *mdev, struct sk_buff *m err = -EMSGSIZE; goto msg_err; } + + /* report features of a vDPA management device through VDPA_ATTR_DEV_SUPPORTED_FEATURES */ if (nla_put_u64_64bit(msg, VDPA_ATTR_DEV_SUPPORTED_FEATURES, mdev->supported_features, VDPA_ATTR_PAD)) { err = -EMSGSIZE; @@ -815,10 +817,10 @@ static int vdpa_dev_net_mq_config_fill(struct vdpa_device *vdev, static int vdpa_dev_net_config_fill(struct vdpa_device *vdev, struct sk_buff *msg) { struct virtio_net_config config = {}; - u64 features; + u64 features_device, features_driver; u16 val_u16; - vdpa_get_config_unlocked(vdev, 0, &config, sizeof(config)); + vdev->config->get_config(vdev, 0, &config, sizeof(config)); if (nla_put(msg, VDPA_ATTR_DEV_NET_CFG_MACADDR, sizeof(config.mac), config.mac)) @@ -832,12 +834,19 @@ static int vdpa_dev_net_config_fill(struct vdpa_device *vdev, struct sk_buff *ms if (nla_put_u16(msg, VDPA_ATTR_DEV_NET_CFG_MTU, val_u16)) return -EMSGSIZE; - features = vdev->config->get_driver_features(vdev); - if (nla_put_u64_64bit(msg, VDPA_ATTR_DEV_NEGOTIATED_FEATURES, features, + features_driver = vdev->config->get_driver_features(vdev); + if (nla_put_u64_64bit(msg, VDPA_ATTR_DEV_NEGOTIATED_FEATURES, features_driver, + VDPA_ATTR_PAD)) + return -EMSGSIZE; + + features_device = vdev->config->get_device_features(vdev); + + /* report features of a vDPA device through VDPA_ATTR_VDPA_DEV_SUPPORTED_FEATURES */ + if (nla_put_u64_64bit(msg, VDPA_ATTR_VDPA_DEV_SUPPORTED_FEATURES, features_device, VDPA_ATTR_PAD)) return -EMSGSIZE; - return vdpa_dev_net_mq_config_fill(vdev, msg, features, &config); + return vdpa_dev_net_mq_config_fill(vdev, msg, features_driver, &config); } static int diff --git a/include/uapi/linux/vdpa.h b/include/uapi/linux/vdpa.h index 25c55cab3d7c..97531b52dcbe 100644 --- a/include/uapi/linux/vdpa.h +++ b/include/uapi/linux/vdpa.h @@ -46,12 +46,16 @@ enum vdpa_attr { VDPA_ATTR_DEV_NEGOTIATED_FEATURES, /* u64 */ VDPA_ATTR_DEV_MGMTDEV_MAX_VQS, /* u32 */ + /* features of a vDPA management device */ VDPA_ATTR_DEV_SUPPORTED_FEATURES, /* u64 */ VDPA_ATTR_DEV_QUEUE_INDEX, /* u32 */ VDPA_ATTR_DEV_VENDOR_ATTR_NAME, /* string */ VDPA_ATTR_DEV_VENDOR_ATTR_VALUE, /* u64 */ + /* features of a vDPA device, e.g., /dev/vhost-vdpa0 */ + VDPA_ATTR_VDPA_DEV_SUPPORTED_FEATURES, /* u64 */ + /* new attributes must be added above here */ VDPA_ATTR_MAX, };