From patchwork Mon Mar 20 14:24:27 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Chuck Lever X-Patchwork-Id: 13181312 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 71F34C7618A for ; Mon, 20 Mar 2023 14:24:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231466AbjCTOYc (ORCPT ); Mon, 20 Mar 2023 10:24:32 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52270 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230457AbjCTOYb (ORCPT ); Mon, 20 Mar 2023 10:24:31 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DC09C17150 for ; Mon, 20 Mar 2023 07:24:29 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 796E26153E for ; Mon, 20 Mar 2023 14:24:29 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id AEF8AC43321; Mon, 20 Mar 2023 14:24:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1679322268; bh=U3y1XZP97v3mpiJsoeXYz/zNPCQ6cgMsirKDIOqrf3s=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=fF0cmYZe8CgbFWDbWt3Sz07t0ZU2NQa/5cnhdC/p7gXSDE42vQke4U4zUTTDPvKVq 5Bd4M0RPEZxLaniXC5SBsmYhiB/V6AASux0ojgCgRuUIsoZLitNvQnz7bsVeBpehDb fl+fTPSm0LKgVYp5ZqV4wbMb2tLUxLaeA+MgcZ6SVNgFuJ5inNxUnqpCw2dsIh3AH2 0OnTpvYjwYePSnsgrJGibf76CnvpC+jVxLcYyMs/0AAScZNDaPagjMzUeFVIzQdoNG B4YMqcDkTx5stJZVcV3LGn8an04IEVZ/lL1S0fgkeLaaLXFn2OnKA/WH73Jc/DpygT YmFmLY84wtGDA== Subject: [PATCH RFC 1/5] SUNRPC: Revert 987c7b1d094d From: Chuck Lever To: linux-nfs@vger.kernel.org Cc: kernel-tls-handshake@lists.linux.dev Date: Mon, 20 Mar 2023 10:24:27 -0400 Message-ID: <167932226768.3131.11453687398743948295.stgit@manet.1015granger.net> In-Reply-To: <167932094748.3131.11264549266195745851.stgit@manet.1015granger.net> References: <167932094748.3131.11264549266195745851.stgit@manet.1015granger.net> User-Agent: StGit/1.5 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-nfs@vger.kernel.org From: Chuck Lever I noticed that server-side TLS always sends the RPC record marker as a separate 4-byte TLS record. This is très inefficace. It seems to be due to commit 987c7b1d094d ("SUNRPC: Remove redundant socket flags from svc_tcp_sendmsg()"), which removed the MSG_* flags from svc_tcp_sendmsg() in favor of using tcp_sock_set_cork. TLS, which rides on top of TCP, ignores the socket's cork setting. Client-side RPC also uses tcp_sock_set_cork, but it still sets MSG_MORE. I don't see similar uncoalesced TLS record traffic there. Signed-off-by: Chuck Lever --- net/sunrpc/svcsock.c | 12 +++++++----- 1 file changed, 7 insertions(+), 5 deletions(-) diff --git a/net/sunrpc/svcsock.c b/net/sunrpc/svcsock.c index 03a4f5615086..28deb4acc392 100644 --- a/net/sunrpc/svcsock.c +++ b/net/sunrpc/svcsock.c @@ -1086,9 +1086,9 @@ static int svc_tcp_sendmsg(struct socket *sock, struct xdr_buf *xdr, .iov_len = sizeof(marker), }; struct msghdr msg = { - .msg_flags = 0, + .msg_flags = MSG_MORE, }; - int ret; + int flags, ret; *sentp = 0; ret = xdr_alloc_bvec(xdr, GFP_KERNEL); @@ -1101,8 +1101,8 @@ static int svc_tcp_sendmsg(struct socket *sock, struct xdr_buf *xdr, *sentp += ret; if (ret != rm.iov_len) return -EAGAIN; - - ret = svc_tcp_send_kvec(sock, head, 0); + flags = head->iov_len < xdr->len ? MSG_MORE | MSG_SENDPAGE_NOTLAST : 0; + ret = svc_tcp_send_kvec(sock, head, flags); if (ret < 0) return ret; *sentp += ret; @@ -1117,10 +1117,12 @@ static int svc_tcp_sendmsg(struct socket *sock, struct xdr_buf *xdr, offset = offset_in_page(xdr->page_base); remaining = xdr->page_len; while (remaining > 0) { + if (remaining <= PAGE_SIZE && tail->iov_len == 0) + flags = 0; len = min(remaining, bvec->bv_len - offset); ret = kernel_sendpage(sock, bvec->bv_page, bvec->bv_offset + offset, - len, 0); + len, flags); if (ret < 0) return ret; *sentp += ret;