From patchwork Sat Jun 17 12:11:34 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Howells X-Patchwork-Id: 109471 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a59:994d:0:b0:3d9:f83d:47d9 with SMTP id k13csp1940095vqr; Sat, 17 Jun 2023 05:15:34 -0700 (PDT) X-Google-Smtp-Source: ACHHUZ4FkYcIBYyuCntpD1CV3qEoBvLTH8Ye7qwFGoLlmK8rhoZUgAHNbXxKr4HsAPCU7L+guRbK X-Received: by 2002:a17:902:e746:b0:1b5:5059:e733 with SMTP id p6-20020a170902e74600b001b55059e733mr162361plf.17.1687004134373; Sat, 17 Jun 2023 05:15:34 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1687004134; cv=none; d=google.com; s=arc-20160816; b=rge8q+pbOmC6lHhEb5m4ozQ545qeyh0qtrtYaN2QMo4xk8bFCMEpwWr+w9Pgp+0RSk kb/jrO8d43gKSJ2HZ8xT5Jn6cx9puYNK88HBeYvaArJ2dUwqe0xhHGXLzkdTDQW5W9es 5UOWqZG9YetPhTQrsnzdFcG+5ssEX6tt7egB1HBMHQPsQfLl/I5/Avyt61HkB3d6iy93 lxmip0zP2K8LtFzYwNmCXReDtCqLrEY0B9AcGQT8VNd/63hrIzUsuE6TaMc+Dc7q9nh+ zA2OZs75PDrIFlmmBLQ11FyvFNuIc1nJrm3z3fU8lAGrEDWwi6ZEAyjk8FiE0JFekMrJ F/eQ== 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=1DmsLXNf6UEopicQGVGHzvB3R+Io/k4xNBk1zidfJPQ=; b=LI9Bv5293A6C9XSkPLozESWtSlFBPBJwQN5eSvSw93nV+CVMu/2khfVd5MQuS9xNWf PdXvW5C5jtykCvRbJClioUn7ztFAhc5emnj4lw9A1jibNmEcSgVOuX+xC3UAf08Dzfdp AzV39q36Hr2AMqwCECNBDkzClds3JR6DZHb6GIYWtrfmehKykbNdBaVnQu+PXX6PeWky Gqjp2t2HV+5pMc9loKz/zs1npiB00iR9jFDcXhB9tHNuwJB4z81bdH1buVEQeTFBwKWn mBozGlOhgtvhcbdYvlFGB+lgaJz3Zpzny7on3r9A0Otf6tm4FrptPcfBG8lCQ9hIWrFz CWJA== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@redhat.com header.s=mimecast20190719 header.b=WK6Rhk0h; 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 e3-20020a170902ef4300b001b043fb4083si17237493plx.16.2023.06.17.05.15.17; Sat, 17 Jun 2023 05:15:34 -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=WK6Rhk0h; 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 S1346239AbjFQMOZ (ORCPT + 99 others); Sat, 17 Jun 2023 08:14:25 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46708 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235871AbjFQMN6 (ORCPT ); Sat, 17 Jun 2023 08:13:58 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 01BC61FCC for ; Sat, 17 Jun 2023 05:12:29 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1687003949; 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=1DmsLXNf6UEopicQGVGHzvB3R+Io/k4xNBk1zidfJPQ=; b=WK6Rhk0hUsNh7r/nEn5rqq1NVKay1422026u2ydmNJei3hXqcts5AstoCKRCYpXN1w6P0/ 0Ys99LXqORD/4UjKdXrJzARLE3Ok+rFsf4Dql7haXvREbTpLYI2pv4Kdvet6imXc+LmuNe 7lO9uWWUVH2iR340w44GU8r9xPECDH8= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-373-vtLjC08lOWSLLrXv76NNIw-1; Sat, 17 Jun 2023 08:12:25 -0400 X-MC-Unique: vtLjC08lOWSLLrXv76NNIw-1 Received: from smtp.corp.redhat.com (int-mx09.intmail.prod.int.rdu2.redhat.com [10.11.54.9]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id B9013185A78E; Sat, 17 Jun 2023 12:12:24 +0000 (UTC) Received: from warthog.procyon.org.com (unknown [10.42.28.51]) by smtp.corp.redhat.com (Postfix) with ESMTP id D391840C5C1; Sat, 17 Jun 2023 12:12:22 +0000 (UTC) From: David Howells To: netdev@vger.kernel.org Cc: David Howells , Alexander Duyck , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Willem de Bruijn , David Ahern , Matthew Wilcox , Jens Axboe , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Ilya Dryomov , Xiubo Li , Jeff Layton , ceph-devel@vger.kernel.org Subject: [PATCH net-next v2 05/17] ceph: Use sendmsg(MSG_SPLICE_PAGES) rather than sendpage Date: Sat, 17 Jun 2023 13:11:34 +0100 Message-ID: <20230617121146.716077-6-dhowells@redhat.com> In-Reply-To: <20230617121146.716077-1-dhowells@redhat.com> References: <20230617121146.716077-1-dhowells@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.9 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, SPF_HELO_NONE,SPF_NONE,T_SCC_BODY_TEXT_LINE autolearn=ham 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?1768952047035036434?= X-GMAIL-MSGID: =?utf-8?q?1768952047035036434?= Use sendmsg() and MSG_SPLICE_PAGES rather than sendpage in ceph when transmitting data. For the moment, this can only transmit one page at a time because of the architecture of net/ceph/, but if write_partial_message_data() can be given a bvec[] at a time by the iteration code, this would allow pages to be sent in a batch. Signed-off-by: David Howells cc: Ilya Dryomov cc: Xiubo Li cc: Jeff Layton cc: "David S. Miller" cc: Eric Dumazet cc: Jakub Kicinski cc: Paolo Abeni cc: Jens Axboe cc: Matthew Wilcox cc: ceph-devel@vger.kernel.org cc: netdev@vger.kernel.org --- net/ceph/messenger_v1.c | 58 ++++++++++++++--------------------------- 1 file changed, 19 insertions(+), 39 deletions(-) diff --git a/net/ceph/messenger_v1.c b/net/ceph/messenger_v1.c index d664cb1593a7..f082e5c780a3 100644 --- a/net/ceph/messenger_v1.c +++ b/net/ceph/messenger_v1.c @@ -74,37 +74,6 @@ static int ceph_tcp_sendmsg(struct socket *sock, struct kvec *iov, return r; } -/* - * @more: either or both of MSG_MORE and MSG_SENDPAGE_NOTLAST - */ -static int ceph_tcp_sendpage(struct socket *sock, struct page *page, - int offset, size_t size, int more) -{ - ssize_t (*sendpage)(struct socket *sock, struct page *page, - int offset, size_t size, int flags); - int flags = MSG_DONTWAIT | MSG_NOSIGNAL | more; - int ret; - - /* - * sendpage cannot properly handle pages with page_count == 0, - * we need to fall back to sendmsg if that's the case. - * - * Same goes for slab pages: skb_can_coalesce() allows - * coalescing neighboring slab objects into a single frag which - * triggers one of hardened usercopy checks. - */ - if (sendpage_ok(page)) - sendpage = sock->ops->sendpage; - else - sendpage = sock_no_sendpage; - - ret = sendpage(sock, page, offset, size, flags); - if (ret == -EAGAIN) - ret = 0; - - return ret; -} - static void con_out_kvec_reset(struct ceph_connection *con) { BUG_ON(con->v1.out_skip); @@ -464,7 +433,6 @@ static int write_partial_message_data(struct ceph_connection *con) struct ceph_msg *msg = con->out_msg; struct ceph_msg_data_cursor *cursor = &msg->cursor; bool do_datacrc = !ceph_test_opt(from_msgr(con->msgr), NOCRC); - int more = MSG_MORE | MSG_SENDPAGE_NOTLAST; u32 crc; dout("%s %p msg %p\n", __func__, con, msg); @@ -482,6 +450,10 @@ static int write_partial_message_data(struct ceph_connection *con) */ crc = do_datacrc ? le32_to_cpu(msg->footer.data_crc) : 0; while (cursor->total_resid) { + struct bio_vec bvec; + struct msghdr msghdr = { + .msg_flags = MSG_SPLICE_PAGES, + }; struct page *page; size_t page_offset; size_t length; @@ -494,9 +466,12 @@ static int write_partial_message_data(struct ceph_connection *con) page = ceph_msg_data_next(cursor, &page_offset, &length); if (length == cursor->total_resid) - more = MSG_MORE; - ret = ceph_tcp_sendpage(con->sock, page, page_offset, length, - more); + msghdr.msg_flags |= MSG_MORE; + + bvec_set_page(&bvec, page, length, page_offset); + iov_iter_bvec(&msghdr.msg_iter, ITER_SOURCE, &bvec, 1, length); + + ret = sock_sendmsg(con->sock, &msghdr); if (ret <= 0) { if (do_datacrc) msg->footer.data_crc = cpu_to_le32(crc); @@ -526,7 +501,10 @@ static int write_partial_message_data(struct ceph_connection *con) */ static int write_partial_skip(struct ceph_connection *con) { - int more = MSG_MORE | MSG_SENDPAGE_NOTLAST; + struct bio_vec bvec; + struct msghdr msghdr = { + .msg_flags = MSG_SPLICE_PAGES | MSG_MORE, + }; int ret; dout("%s %p %d left\n", __func__, con, con->v1.out_skip); @@ -534,9 +512,11 @@ static int write_partial_skip(struct ceph_connection *con) size_t size = min(con->v1.out_skip, (int)PAGE_SIZE); if (size == con->v1.out_skip) - more = MSG_MORE; - ret = ceph_tcp_sendpage(con->sock, ceph_zero_page, 0, size, - more); + msghdr.msg_flags &= ~MSG_MORE; + bvec_set_page(&bvec, ZERO_PAGE(0), size, 0); + iov_iter_bvec(&msghdr.msg_iter, ITER_SOURCE, &bvec, 1, size); + + ret = sock_sendmsg(con->sock, &msghdr); if (ret <= 0) goto out; con->v1.out_skip -= ret;