From patchwork Fri Jun 16 16:12:48 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Howells X-Patchwork-Id: 13282954 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 1ECBCEB64DD for ; Fri, 16 Jun 2023 16:15:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1344059AbjFPQPW (ORCPT ); Fri, 16 Jun 2023 12:15:22 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40676 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229471AbjFPQOW (ORCPT ); Fri, 16 Jun 2023 12:14:22 -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 57FA13599 for ; Fri, 16 Jun 2023 09:13:30 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1686932009; 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=YYS034GKDySecOdrK/ijkCT1/wJ/bhRWcrqNTpCuyQ+IvlWvQPVggCdbxldkyAL+xQe11e VW0YyvgjLEotxk9j2Ir1LWOvpVd5ODGEQ+/pgN4X3OpNnp9bc3T0sHVjUIcb+4YEwCFQoT BySp6tO7dC/5GoAOxQFRxaZKirQoC2M= 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-280-lvR3TEYCMuWBlcKwIOkPGg-1; Fri, 16 Jun 2023 12:13:25 -0400 X-MC-Unique: lvR3TEYCMuWBlcKwIOkPGg-1 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.rdu2.redhat.com [10.11.54.4]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 70E1938041D5; Fri, 16 Jun 2023 16:13:24 +0000 (UTC) Received: from warthog.procyon.org.com (unknown [10.42.28.51]) by smtp.corp.redhat.com (Postfix) with ESMTP id BA8442026D49; Fri, 16 Jun 2023 16:13:21 +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 05/17] ceph: Use sendmsg(MSG_SPLICE_PAGES) rather than sendpage Date: Fri, 16 Jun 2023 17:12:48 +0100 Message-ID: <20230616161301.622169-6-dhowells@redhat.com> In-Reply-To: <20230616161301.622169-1-dhowells@redhat.com> References: <20230616161301.622169-1-dhowells@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.4 Precedence: bulk List-ID: X-Mailing-List: ceph-devel@vger.kernel.org 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; From patchwork Fri Jun 16 16:12:50 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Howells X-Patchwork-Id: 13282953 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 0C40BEB64D7 for ; Fri, 16 Jun 2023 16:15:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S245185AbjFPQPR (ORCPT ); Fri, 16 Jun 2023 12:15:17 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40762 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1344104AbjFPQOb (ORCPT ); Fri, 16 Jun 2023 12:14:31 -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 26E563AA8 for ; Fri, 16 Jun 2023 09:13:36 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1686932015; 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=fSQZQ6YboxRaXsiohOL5R9kf0uRRv2lhrE9A+pyCn4U=; b=Ntgb/WIrvm4+0QH6DTEp/zEOknQCU3U6QzXH3rCCk4K763xRNjYkGSwfB6C0sd+Xz4eh++ KJ1xjD+ekjWSyaVm52CFzcNFGKEoIDqK1mwZvTY+M4GUr1Er+zdtCJWJSs1vIswyhKGQIW Q3UHUELYEkbkdmKtXeEGac5Gaz3DvQQ= 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-589-6q7z6BCsPgKZv0muxF5mVQ-1; Fri, 16 Jun 2023 12:13:31 -0400 X-MC-Unique: 6q7z6BCsPgKZv0muxF5mVQ-1 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.rdu2.redhat.com [10.11.54.8]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 37C5B3C0E456; Fri, 16 Jun 2023 16:13:30 +0000 (UTC) Received: from warthog.procyon.org.com (unknown [10.42.28.51]) by smtp.corp.redhat.com (Postfix) with ESMTP id 14059C1604C; Fri, 16 Jun 2023 16:13:27 +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 07/17] ceph: Use sendmsg(MSG_SPLICE_PAGES) rather than sendpage() Date: Fri, 16 Jun 2023 17:12:50 +0100 Message-ID: <20230616161301.622169-8-dhowells@redhat.com> In-Reply-To: <20230616161301.622169-1-dhowells@redhat.com> References: <20230616161301.622169-1-dhowells@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.8 Precedence: bulk List-ID: X-Mailing-List: ceph-devel@vger.kernel.org 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_v2.c | 91 +++++++++-------------------------------- 1 file changed, 19 insertions(+), 72 deletions(-) diff --git a/net/ceph/messenger_v2.c b/net/ceph/messenger_v2.c index 301a991dc6a6..87ac97073e75 100644 --- a/net/ceph/messenger_v2.c +++ b/net/ceph/messenger_v2.c @@ -117,91 +117,38 @@ static int ceph_tcp_recv(struct ceph_connection *con) return ret; } -static int do_sendmsg(struct socket *sock, struct iov_iter *it) -{ - struct msghdr msg = { .msg_flags = CEPH_MSG_FLAGS }; - int ret; - - msg.msg_iter = *it; - while (iov_iter_count(it)) { - ret = sock_sendmsg(sock, &msg); - if (ret <= 0) { - if (ret == -EAGAIN) - ret = 0; - return ret; - } - - iov_iter_advance(it, ret); - } - - WARN_ON(msg_data_left(&msg)); - return 1; -} - -static int do_try_sendpage(struct socket *sock, struct iov_iter *it) -{ - struct msghdr msg = { .msg_flags = CEPH_MSG_FLAGS }; - struct bio_vec bv; - int ret; - - if (WARN_ON(!iov_iter_is_bvec(it))) - return -EINVAL; - - while (iov_iter_count(it)) { - /* iov_iter_iovec() for ITER_BVEC */ - bvec_set_page(&bv, it->bvec->bv_page, - min(iov_iter_count(it), - it->bvec->bv_len - it->iov_offset), - it->bvec->bv_offset + it->iov_offset); - - /* - * 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(bv.bv_page)) { - ret = sock->ops->sendpage(sock, bv.bv_page, - bv.bv_offset, bv.bv_len, - CEPH_MSG_FLAGS); - } else { - iov_iter_bvec(&msg.msg_iter, ITER_SOURCE, &bv, 1, bv.bv_len); - ret = sock_sendmsg(sock, &msg); - } - if (ret <= 0) { - if (ret == -EAGAIN) - ret = 0; - return ret; - } - - iov_iter_advance(it, ret); - } - - return 1; -} - /* * Write as much as possible. The socket is expected to be corked, - * so we don't bother with MSG_MORE/MSG_SENDPAGE_NOTLAST here. + * so we don't bother with MSG_MORE here. * * Return: - * 1 - done, nothing (else) to write + * >0 - done, nothing (else) to write * 0 - socket is full, need to wait * <0 - error */ static int ceph_tcp_send(struct ceph_connection *con) { + struct msghdr msg = { + .msg_iter = con->v2.out_iter, + .msg_flags = CEPH_MSG_FLAGS, + }; int ret; + if (WARN_ON(!iov_iter_is_bvec(&con->v2.out_iter))) + return -EINVAL; + + if (con->v2.out_iter_sendpage) + msg.msg_flags |= MSG_SPLICE_PAGES; + dout("%s con %p have %zu try_sendpage %d\n", __func__, con, iov_iter_count(&con->v2.out_iter), con->v2.out_iter_sendpage); - if (con->v2.out_iter_sendpage) - ret = do_try_sendpage(con->sock, &con->v2.out_iter); - else - ret = do_sendmsg(con->sock, &con->v2.out_iter); + + ret = sock_sendmsg(con->sock, &msg); + if (ret > 0) + iov_iter_advance(&con->v2.out_iter, ret); + else if (ret == -EAGAIN) + ret = 0; + dout("%s con %p ret %d left %zu\n", __func__, con, ret, iov_iter_count(&con->v2.out_iter)); return ret;