From patchwork Thu Mar 16 15:25:51 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Howells X-Patchwork-Id: 70840 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a5d:604a:0:0:0:0:0 with SMTP id j10csp552462wrt; Thu, 16 Mar 2023 08:38:58 -0700 (PDT) X-Google-Smtp-Source: AK7set//AadHITvSdm8ZmmhWrnsJ8EUqlVi9GqkM3OOLccLMQIUizI5rZ2syyD/obDTJip+C74ii X-Received: by 2002:a17:90b:4b46:b0:23e:fa90:ba3e with SMTP id mi6-20020a17090b4b4600b0023efa90ba3emr4376648pjb.13.1678981138255; Thu, 16 Mar 2023 08:38:58 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1678981138; cv=none; d=google.com; s=arc-20160816; b=Kk8Aqmz6sHz/Y1LSOqPgD74nfHSV44z7/qPR0cVAdLD61vbUhmmtxxH2Q6KvZTBn3w ewVLm/TUbpIomW4gGCgoINOvslfI5QC7DDXOWEzn8BhZoo/bR62bsM3H90y/bZdK+WPn ypov2mDxH5J2cU0INODq4dhRkBH6aagPRsi63WeaGD7Dp33S6ZBcGgYxwWgin2WZg/n9 7bMuiDOmJFzyLp2JSbIFwOBj0ZjUmqGhzt+EfQByXi3EpyYW/PoIEDgTaE0Ll5/aXxtE ubRdDx9J1C+9KMveF69N/o/bGLn+WyYtKjKGZLjpb5v82bsm+H9HvxD7fI/DuZzaTVDC WgBw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version :references:in-reply-to:message-id:date:subject:cc:to:from :dkim-signature; bh=Jp818uqIiXwVZdp69UNUHXRADr94Nvu0NDkz6WG9MO0=; b=buU4Jsxc9psThbYQOReE5f5tosyWeQmI+QdmGvNQg2EkPNfcRMzHKbjzBa4VNlSzem 5A3gR20/iaqrYi5eQgb54MOxPzmM9sXKbXZN4R0Ful6+cEUfKAzc5d57/iSw7Jk90Ny4 yRYLMlDXoRH4g/XWEGPa207qfpm7z5FNLJfjWSus1ZWM+ipO9+TLfSD//74n9wZMiqay K5ZBbkeNdUVSRF19bARUAA0j+G/niymNwmpWjYPXqT+wkOlvDiM0b548Oiu4ZgUhKCsA mYdXJlBrWcVvqC2wZfP7nzh4ZzML7WOoBNvKq6ORkcK52v87fzQcW7FOeViTdzPDD4Xc /CAg== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@redhat.com header.s=mimecast20190719 header.b=DdNW20To; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: from out1.vger.email (out1.vger.email. [2620:137:e000::1:20]) by mx.google.com with ESMTP id d18-20020a170903231200b0019d04cfd41asi8689793plh.593.2023.03.16.08.38.44; Thu, 16 Mar 2023 08:38:58 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@redhat.com header.s=mimecast20190719 header.b=DdNW20To; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230478AbjCPP1g (ORCPT + 99 others); Thu, 16 Mar 2023 11:27:36 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58266 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230447AbjCPP1W (ORCPT ); Thu, 16 Mar 2023 11:27:22 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C8040474EE for ; Thu, 16 Mar 2023 08:26:33 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1678980393; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=Jp818uqIiXwVZdp69UNUHXRADr94Nvu0NDkz6WG9MO0=; b=DdNW20To3nB5pOnHOFwkpbjoh2hoGYrsGJWA0VSgdqAKIuytTaKOL1umn1XqmgjrR5ds8T GXT36qvhNl+gtOI2EtJn7FF7UnuxJsXgq+qs2hDzXQP8I8VqQOkWiE5/LR49dudrxdlhaA KTbJxqmxiljRlbZssgaJCuCckBkAjcU= Received: from mimecast-mx02.redhat.com (mx3-rdu2.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-208-5oyLTBYpPFiR48_BvOmftQ-1; Thu, 16 Mar 2023 11:26:26 -0400 X-MC-Unique: 5oyLTBYpPFiR48_BvOmftQ-1 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.rdu2.redhat.com [10.11.54.2]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id E00D528237D2; Thu, 16 Mar 2023 15:26:25 +0000 (UTC) Received: from warthog.procyon.org.uk (unknown [10.33.36.18]) by smtp.corp.redhat.com (Postfix) with ESMTP id 2204B40C6E67; Thu, 16 Mar 2023 15:26:24 +0000 (UTC) From: David Howells To: Matthew Wilcox , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni Cc: David Howells , Al Viro , Christoph Hellwig , Jens Axboe , Jeff Layton , Christian Brauner , Linus Torvalds , netdev@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [RFC PATCH 01/28] net: Declare MSG_SPLICE_PAGES internal sendmsg() flag Date: Thu, 16 Mar 2023 15:25:51 +0000 Message-Id: <20230316152618.711970-2-dhowells@redhat.com> In-Reply-To: <20230316152618.711970-1-dhowells@redhat.com> References: <20230316152618.711970-1-dhowells@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.2 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H2,SPF_HELO_NONE,SPF_NONE autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1760539325756513486?= X-GMAIL-MSGID: =?utf-8?q?1760539325756513486?= Declare MSG_SPLICE_PAGES, an internal sendmsg() flag, that hints to a network protocol that it should splice pages from the source iterator rather than copying the data if it can. This is intended as a replacement for the ->sendpage() op, allowing a way to splice in several multipage folios in one go. Signed-off-by: David Howells cc: "David S. Miller" cc: Eric Dumazet cc: Jakub Kicinski cc: Paolo Abeni cc: Jens Axboe cc: Matthew Wilcox cc: netdev@vger.kernel.org --- include/linux/socket.h | 1 + 1 file changed, 1 insertion(+) diff --git a/include/linux/socket.h b/include/linux/socket.h index 13c3a237b9c9..a67d02da3c54 100644 --- a/include/linux/socket.h +++ b/include/linux/socket.h @@ -327,6 +327,7 @@ struct ucred { */ #define MSG_ZEROCOPY 0x4000000 /* Use user data in kernel path */ +#define MSG_SPLICE_PAGES 0x8000000 /* Splice the pages from the iterator in sendmsg() */ #define MSG_FASTOPEN 0x20000000 /* Send data in TCP SYN */ #define MSG_CMSG_CLOEXEC 0x40000000 /* Set close_on_exec for file descriptor received through