From patchwork Thu Sep 1 10:16:01 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Zhu, Lingshan" X-Patchwork-Id: 12962250 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 B2D46ECAAD1 for ; Thu, 1 Sep 2022 10:25:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234161AbiIAKZK (ORCPT ); Thu, 1 Sep 2022 06:25:10 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48442 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234119AbiIAKZC (ORCPT ); Thu, 1 Sep 2022 06:25:02 -0400 Received: from mga01.intel.com (mga01.intel.com [192.55.52.88]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id EC64CF582; Thu, 1 Sep 2022 03:25:00 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1662027900; x=1693563900; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=Z5PGIJ24d2/V8jR3uKC69UP3AbGrpcu/ETrBJkm8rrQ=; b=UBsawSrK26fpjiAP0v2ToxrAYYK/Orhpbb0jaeKjBIIwRmMuSHvXnMpI +neiY4i3cEnQLTP7dXPwrCSvNlh1e4AGrNuQ1xlPyEyKRMn8XexddzcPH dKS2tOJxS4sBnnV1rcfb8fJUaixywhN4KTMFWF6HpCHJb0S2DYI1o/Kox 4IvL0kxu28iBrj/84EUESyr32zRo83jLDVbYXNWz0eE3I/favNdEmUc0k tlvnSqSlJWTibwKOhzPr0XBPIGYMe8/V0Vj5HfIi/dihud3ubYYKTmdMp l/oUaGDSrHh2N5pM6g/M2oCgvgi5hpLqsa2C44MvXm+8NPVxqbZGbiAjR w==; X-IronPort-AV: E=McAfee;i="6500,9779,10456"; a="321825567" X-IronPort-AV: E=Sophos;i="5.93,280,1654585200"; d="scan'208";a="321825567" Received: from orsmga008.jf.intel.com ([10.7.209.65]) by fmsmga101.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 01 Sep 2022 03:25:00 -0700 X-IronPort-AV: E=Sophos;i="5.93,280,1654585200"; d="scan'208";a="642276453" Received: from unknown (HELO localhost.localdomain.bj.intel.com) ([10.240.193.73]) by orsmga008-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 01 Sep 2022 03:24:58 -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: [RFC 4/4] vDPA: report device endian-ness to userspace through netlink Date: Thu, 1 Sep 2022 18:16:01 +0800 Message-Id: <20220901101601.61420-5-lingshan.zhu@intel.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20220901101601.61420-1-lingshan.zhu@intel.com> References: <20220901101601.61420-1-lingshan.zhu@intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org This commit introduces a new netlink attr VDPA_ATTR_DEV_ENDIAN to report device endian-ness to usersapce. So the userspace tools can be aware of the endian-ness of the device, even uninitialized legacy/transitional devices. Signed-off-by: Zhu Lingshan --- drivers/vdpa/vdpa.c | 3 +++ include/uapi/linux/vdpa.h | 1 + 2 files changed, 4 insertions(+) diff --git a/drivers/vdpa/vdpa.c b/drivers/vdpa/vdpa.c index 8a08caf573d1..d361f951ff63 100644 --- a/drivers/vdpa/vdpa.c +++ b/drivers/vdpa/vdpa.c @@ -848,6 +848,9 @@ static int vdpa_dev_net_config_fill(struct vdpa_device *vdev, struct sk_buff *ms VDPA_ATTR_PAD)) return -EMSGSIZE; + if (nla_put_u8(msg, VDPA_ATTR_DEV_ENDIAN, le)) + return -EMSGSIZE; + return vdpa_dev_net_mq_config_fill(vdev, msg, features, &config); } diff --git a/include/uapi/linux/vdpa.h b/include/uapi/linux/vdpa.h index 25c55cab3d7c..bb9797781f97 100644 --- a/include/uapi/linux/vdpa.h +++ b/include/uapi/linux/vdpa.h @@ -51,6 +51,7 @@ enum vdpa_attr { VDPA_ATTR_DEV_QUEUE_INDEX, /* u32 */ VDPA_ATTR_DEV_VENDOR_ATTR_NAME, /* string */ VDPA_ATTR_DEV_VENDOR_ATTR_VALUE, /* u64 */ + VDPA_ATTR_DEV_ENDIAN, /* u8 */ /* new attributes must be added above here */ VDPA_ATTR_MAX,