From patchwork Thu Sep 29 01:45:50 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Zhu, Lingshan" X-Patchwork-Id: 12993364 X-Patchwork-Delegate: kuba@kernel.org 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 B839CC04A95 for ; Thu, 29 Sep 2022 01:54:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234141AbiI2ByS (ORCPT ); Wed, 28 Sep 2022 21:54:18 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40422 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231419AbiI2ByQ (ORCPT ); Wed, 28 Sep 2022 21:54:16 -0400 Received: from mga07.intel.com (mga07.intel.com [134.134.136.100]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1E4E822B3C; Wed, 28 Sep 2022 18:54:16 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1664416454; x=1695952454; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=afMekNlPbl2PpdEGr4IwA97D38+TBDd0zzrloo6xahk=; b=Y0XGqunotSUO5FMlzn9sF3pU/3l/mKZaJDTXncNSfLhZJaYm99PPxTwx QmLh3OsI+MJCii3D5kO5qXv23GAest2M/GuO5Q+GTGoPHBNd3iWh9gmf2 yTONAXidL7QtQzXl1UGK4uW+Nt1SAi00o1nlkJPgHu0JCt60LmTKaX0XO +tkyrlEREy4Ag0QnUZSMInoq/2aasp6MBy7P3cCZqwM3JDlxd9zI74/dr tluyBHOz35rboBjeospPLEzKL9PYh5J1zpmPdjq8jRMtpnpLIwM5QYEn6 Q24Zin6aC+xKJ4EV+XxJ1UycNFe/BJMB4iGyIAtn5pHyCABr2TpYq+q3o A==; X-IronPort-AV: E=McAfee;i="6500,9779,10484"; a="365813985" X-IronPort-AV: E=Sophos;i="5.93,353,1654585200"; d="scan'208";a="365813985" Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by orsmga105.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 28 Sep 2022 18:54:13 -0700 X-IronPort-AV: E=McAfee;i="6500,9779,10484"; a="950931650" X-IronPort-AV: E=Sophos;i="5.93,353,1654585200"; d="scan'208";a="950931650" Received: from unknown (HELO localhost.localdomain.bj.intel.com) ([10.240.193.73]) by fmsmga005-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 28 Sep 2022 18:54:14 -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 V3 1/6] vDPA: allow userspace to query features of a vDPA device Date: Thu, 29 Sep 2022 09:45:50 +0800 Message-Id: <20220929014555.112323-2-lingshan.zhu@intel.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20220929014555.112323-1-lingshan.zhu@intel.com> References: <20220929014555.112323-1-lingshan.zhu@intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@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() rather than vdpa_get_config_unlocked() to read the device config spcae, so no races in vdpa_set_features_unlocked() Userspace tool iproute2 example: $ vdpa dev config show vdpa0 vdpa0: mac 00:e8:ca:11:be:05 link up link_announce false max_vq_pairs 4 mtu 1500 negotiated_features MRG_RXBUF CTRL_VQ MQ VERSION_1 ACCESS_PLATFORM dev_features MTU MAC MRG_RXBUF CTRL_VQ MQ ANY_LAYOUT VERSION_1 ACCESS_PLATFORM Signed-off-by: Zhu Lingshan --- drivers/vdpa/vdpa.c | 16 +++++++++++----- include/uapi/linux/vdpa.h | 4 ++++ 2 files changed, 15 insertions(+), 5 deletions(-) diff --git a/drivers/vdpa/vdpa.c b/drivers/vdpa/vdpa.c index c06c02704461..1363b42c9d28 100644 --- a/drivers/vdpa/vdpa.c +++ b/drivers/vdpa/vdpa.c @@ -815,10 +815,10 @@ 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 +832,18 @@ 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); + + 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..07474183fdb3 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 */ + /* virtio features that are supported by the 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 */ + /* virtio features that are supported by the vDPA device */ + VDPA_ATTR_VDPA_DEV_SUPPORTED_FEATURES, /* u64 */ + /* new attributes must be added above here */ VDPA_ATTR_MAX, };