From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-17.6 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,NICE_REPLY_A, SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 62928C433E6 for ; Mon, 1 Feb 2021 06:47:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 38CD964E24 for ; Mon, 1 Feb 2021 06:47:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232405AbhBAGrW (ORCPT ); Mon, 1 Feb 2021 01:47:22 -0500 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:49257 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231733AbhBAFsM (ORCPT ); Mon, 1 Feb 2021 00:48:12 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1612158406; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=f2ImvkHtiWKuR6rS+/oQGBneQ9ERdYR3AODwgtXhy8s=; b=e93H3dzl0DS/WvkOO49HpGkn9I5WrmBhcn51Vp5Zo1AfjeoEJnAdeM9lyn9CBR9hhQWyPb oemkjyJdKoNmghE93KwIoBOnfUDOdSMGmLfxF/8TrLdQw7qCueCw4XTzdaW+n0CWwvdMV/ OTXvor84+S7UQ/AaTr6rhg59UD43nOc= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-111-YD89M8YCMyS_gQszRSShvw-1; Mon, 01 Feb 2021 00:46:42 -0500 X-MC-Unique: YD89M8YCMyS_gQszRSShvw-1 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 412171005504; Mon, 1 Feb 2021 05:46:41 +0000 (UTC) Received: from [10.72.13.120] (ovpn-13-120.pek2.redhat.com [10.72.13.120]) by smtp.corp.redhat.com (Postfix) with ESMTP id 72FDA5E1A8; Mon, 1 Feb 2021 05:46:29 +0000 (UTC) Subject: Re: [PATCH RFC v2 05/10] vringh: add vringh_kiov_length() helper To: Stefano Garzarella , virtualization@lists.linux-foundation.org Cc: Xie Yongji , "Michael S. Tsirkin" , Laurent Vivier , Stefan Hajnoczi , linux-kernel@vger.kernel.org, Max Gurtovoy , kvm@vger.kernel.org References: <20210128144127.113245-1-sgarzare@redhat.com> <20210128144127.113245-6-sgarzare@redhat.com> From: Jason Wang Message-ID: Date: Mon, 1 Feb 2021 13:46:27 +0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <20210128144127.113245-6-sgarzare@redhat.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Content-Language: en-US X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 2021/1/28 下午10:41, Stefano Garzarella wrote: > This new helper returns the total number of bytes covered by > a vringh_kiov. > > Suggested-by: Jason Wang > Signed-off-by: Stefano Garzarella Acked-by: Jason Wang > --- > include/linux/vringh.h | 11 +++++++++++ > 1 file changed, 11 insertions(+) > > diff --git a/include/linux/vringh.h b/include/linux/vringh.h > index 755211ebd195..84db7b8f912f 100644 > --- a/include/linux/vringh.h > +++ b/include/linux/vringh.h > @@ -199,6 +199,17 @@ static inline void vringh_kiov_cleanup(struct vringh_kiov *kiov) > kiov->iov = NULL; > } > > +static inline size_t vringh_kiov_length(struct vringh_kiov *kiov) > +{ > + size_t len = 0; > + int i; > + > + for (i = kiov->i; i < kiov->used; i++) > + len += kiov->iov[i].iov_len; > + > + return len; > +} > + > void vringh_kiov_advance(struct vringh_kiov *kiov, size_t len); > > int vringh_getdesc_kern(struct vringh *vrh,