From patchwork Tue Sep 27 03:01:11 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Zhu, Lingshan" X-Patchwork-Id: 12989785 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 93535C32771 for ; Tue, 27 Sep 2022 03:12:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231317AbiI0DMP (ORCPT ); Mon, 26 Sep 2022 23:12:15 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46108 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231134AbiI0DL2 (ORCPT ); Mon, 26 Sep 2022 23:11:28 -0400 Received: from mga01.intel.com (mga01.intel.com [192.55.52.88]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1528867469; Mon, 26 Sep 2022 20:09:30 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1664248170; x=1695784170; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=ZKeEzr0bR3d0Xgw13gTFdEepFQQZirVRWpLZzBk6Pu8=; b=GHSncXInzp56gk+VAfO+SXPpWM3yoaGtoB9CONyZWnZSlup39APGomV0 ts3/kaCNObHKdBpvkc7b3gJ4cwQSGQ6x+wMcPMVPeE4Vm0BDJHYbBVHlZ yX85KZeay41EzaQS/iVFKQuumGq0yw0HGTh7LvrfAdsY0KXGl/B17eR6e Y2b52Taes/dD64RJ39OayXmcr65KBhTlg6gzsWD0W+IX068SRhNqQ6AHK AfDiMzbafh1khSgGx9/QWK6dR37adxsHpr8gv+/CkCwPlwIm0DXBOTnfT gk+0IM7RxJOozWoV++mpmeI/KCwAoRqXTo1b9tZf5yPRlXAkRufKg/faJ A==; X-IronPort-AV: E=McAfee;i="6500,9779,10482"; a="327558435" X-IronPort-AV: E=Sophos;i="5.93,348,1654585200"; d="scan'208";a="327558435" Received: from fmsmga003.fm.intel.com ([10.253.24.29]) by fmsmga101.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 26 Sep 2022 20:09:29 -0700 X-IronPort-AV: E=McAfee;i="6500,9779,10482"; a="710387744" X-IronPort-AV: E=Sophos;i="5.93,348,1654585200"; d="scan'208";a="710387744" Received: from unknown (HELO localhost.localdomain.bj.intel.com) ([10.240.193.73]) by fmsmga003-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 26 Sep 2022 20:09:27 -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 V2 RESEND 0/6] Conditionally read fields in dev cfg space Date: Tue, 27 Sep 2022 11:01:11 +0800 Message-Id: <20220927030117.5635-1-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 Resend to fix a typo reace --> race in the commit message. 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 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 | 71 ++++++++++++++++++++++++++++++--------- include/uapi/linux/vdpa.h | 4 +++ 2 files changed, 59 insertions(+), 16 deletions(-)