From patchwork Thu Sep 29 01:45:49 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Zhu, Lingshan" X-Patchwork-Id: 12993363 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 4368BC04A95 for ; Thu, 29 Sep 2022 01:54:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233931AbiI2ByQ (ORCPT ); Wed, 28 Sep 2022 21:54:16 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40414 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232242AbiI2ByP (ORCPT ); Wed, 28 Sep 2022 21:54:15 -0400 Received: from mga07.intel.com (mga07.intel.com [134.134.136.100]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BF29822BDA; Wed, 28 Sep 2022 18:54:14 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1664416452; x=1695952452; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=whH5AC8kMAxW+DvvWFDRKDdPE+thuIPFy2NSLFOY2uc=; b=LVGlmxXgsDPCirbKnRtZoHaPCd5K8MVuZpbFO0FA0Il47TKy+TZGnQEl CjablpxmezpNNly6H9fl9hLiB+7r6q1QtJFQaDfIHrpnkJpPN6N1eGdr7 vQtC5Vog6lPs1tuIoK+i454SUl2KxVmk+5U6f4FqKV5mGw1xniI7t9Mum wEIP4wg2VftPJzrtwmCqXG8LWmXOxJ00ENyOCrCsAgoLH5GKMe/UNWevK jV95yBANqSjjJTqhdcBSNjzJkbp1lNG9L+byZ/yYZNTo2j0vI0zI/2mfs mzUmZZ1by+Z0t5UNLjwqONTcGB8myTC+B1CQFDGbU5Wi1HeNseDARfSC0 A==; X-IronPort-AV: E=McAfee;i="6500,9779,10484"; a="365813983" X-IronPort-AV: E=Sophos;i="5.93,353,1654585200"; d="scan'208";a="365813983" 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 18:54:12 -0700 X-IronPort-AV: E=McAfee;i="6500,9779,10484"; a="950931614" X-IronPort-AV: E=Sophos;i="5.93,353,1654585200"; d="scan'208";a="950931614" 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 18:54:12 -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 0/6] Conditionally read fields in dev cfg space Date: Thu, 29 Sep 2022 09:45:49 +0800 Message-Id: <20220929014555.112323-1-lingshan.zhu@intel.com> X-Mailer: git-send-email 2.31.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org This series intends to read the fields in virtio-net device configuration space conditionally on the feature bits, this means: MTU exists if VIRTIO_NET_F_MTU is set MAC exists if VIRTIO_NET_F_NET is set MQ exists if VIRTIO_NET_F_MQ or VIRTIO_NET_F_RSS is set. This series report device features to userspace and 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() Thanks! Changes form V2: remove unnacessary checking for vdev->config->get_status (Jason) Changes from V1: 1)Better comments for VDPA_ATTR_VDPA_DEV_SUPPORTED_FEATURES, only in the header file(Jason) 2)Split original 3/4 into separate patches(Jason) 3)Check FEATURES_OK for reporting driver features in vdpa_dev_config_fill (Jason) 4) Add iproute2 example for reporting device features Zhu Lingshan (6): vDPA: allow userspace to query features of a vDPA device vDPA: only report driver features if FEATURES_OK is set vDPA: check VIRTIO_NET_F_RSS for max_virtqueue_paris's presence vDPA: check virtio device features to detect MQ vDPA: fix spars cast warning in vdpa_dev_net_mq_config_fill vDPA: conditionally read MTU and MAC in dev cfg space drivers/vdpa/vdpa.c | 68 ++++++++++++++++++++++++++++++--------- include/uapi/linux/vdpa.h | 4 +++ 2 files changed, 56 insertions(+), 16 deletions(-)