From patchwork Thu May 28 05:12:25 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 11574491 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 164181392 for ; Thu, 28 May 2020 05:15:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id F2A3020721 for ; Thu, 28 May 2020 05:15:29 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="F4Mm/E2S" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728129AbgE1FOM (ORCPT ); Thu, 28 May 2020 01:14:12 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40520 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728078AbgE1FOD (ORCPT ); Thu, 28 May 2020 01:14:03 -0400 Received: from bombadil.infradead.org (bombadil.infradead.org [IPv6:2607:7c80:54:e::133]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CDAA2C05BD1E; Wed, 27 May 2020 22:14:02 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender :Reply-To:Content-Type:Content-ID:Content-Description; bh=El21RsQvoe4su07D1xd5LvSJKGBTGSQ1DZmCIUEZHFs=; b=F4Mm/E2SA3U5Mluz2d/lWlc4fy WpF86GeJU3CsLvaYB17KWWIHI9E1bXwygh2i2wsItB+Ooge6mt1v40cwKqy57p7up3jcA8DHq0HF2 s58W/jg2OyfktgeNlJJhjm2QCVLpuwXva9UhyYOr87CjUscKFmZS8VQyDOlaGpY0WlXRSkenLCUzb fOWIU48dPb9snOpRtYIBKdmbOAyuzxl1ARgL9sSMGHTiAXd9Px60yC7KLT9zmbK4v5QFdZ2PsKbpQ O9uunWgOqY4wZFoQ0ZKwBRYuI6cE3rN4GfNZlGgONbVwdOynm/NQizTUqGcjojTJkUmTa5uJV+tUt kQ9xg7dQ==; Received: from p4fdb1ad2.dip0.t-ipconnect.de ([79.219.26.210] helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1jeArI-0002Bd-68; Thu, 28 May 2020 05:13:36 +0000 From: Christoph Hellwig To: "David S. Miller" , Jakub Kicinski Cc: Eric Dumazet , Alexey Kuznetsov , Hideaki YOSHIFUJI , Jon Maloy , Ying Xue , drbd-dev@lists.linbit.com, linux-kernel@vger.kernel.org, linux-rdma@vger.kernel.org, linux-nvme@lists.infradead.org, target-devel@vger.kernel.org, linux-afs@lists.infradead.org, linux-cifs@vger.kernel.org, cluster-devel@redhat.com, ocfs2-devel@oss.oracle.com, netdev@vger.kernel.org, ceph-devel@vger.kernel.org, rds-devel@oss.oracle.com, linux-nfs@vger.kernel.org, tipc-discussion@lists.sourceforge.net Subject: [PATCH 17/28] tcp: add tcp_sock_set_keepcnt Date: Thu, 28 May 2020 07:12:25 +0200 Message-Id: <20200528051236.620353-18-hch@lst.de> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200528051236.620353-1-hch@lst.de> References: <20200528051236.620353-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Sender: target-devel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: target-devel@vger.kernel.org Add a helper to directly set the TCP_KEEPCNT sockopt from kernel space without going through a fake uaccess. Signed-off-by: Christoph Hellwig --- include/linux/tcp.h | 1 + net/ipv4/tcp.c | 12 ++++++++++++ net/rds/tcp.h | 2 +- net/rds/tcp_listen.c | 17 +++-------------- net/sunrpc/xprtsock.c | 3 +-- 5 files changed, 18 insertions(+), 17 deletions(-) diff --git a/include/linux/tcp.h b/include/linux/tcp.h index 1f9bada00faab..9aac824c523cf 100644 --- a/include/linux/tcp.h +++ b/include/linux/tcp.h @@ -498,6 +498,7 @@ int tcp_skb_shift(struct sk_buff *to, struct sk_buff *from, int pcount, int shiftlen); void tcp_sock_set_cork(struct sock *sk, bool on); +int tcp_sock_set_keepcnt(struct sock *sk, int val); int tcp_sock_set_keepidle(struct sock *sk, int val); int tcp_sock_set_keepintvl(struct sock *sk, int val); void tcp_sock_set_nodelay(struct sock *sk); diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c index 7eb083e09786a..15d47d5e79510 100644 --- a/net/ipv4/tcp.c +++ b/net/ipv4/tcp.c @@ -2946,6 +2946,18 @@ int tcp_sock_set_keepintvl(struct sock *sk, int val) } EXPORT_SYMBOL(tcp_sock_set_keepintvl); +int tcp_sock_set_keepcnt(struct sock *sk, int val) +{ + if (val < 1 || val > MAX_TCP_KEEPCNT) + return -EINVAL; + + lock_sock(sk); + tcp_sk(sk)->keepalive_probes = val; + release_sock(sk); + return 0; +} +EXPORT_SYMBOL(tcp_sock_set_keepcnt); + /* * Socket option code for TCP. */ diff --git a/net/rds/tcp.h b/net/rds/tcp.h index f6d75d8cb167a..bad9cf49d5657 100644 --- a/net/rds/tcp.h +++ b/net/rds/tcp.h @@ -70,7 +70,7 @@ struct socket *rds_tcp_listen_init(struct net *net, bool isv6); void rds_tcp_listen_stop(struct socket *sock, struct work_struct *acceptor); void rds_tcp_listen_data_ready(struct sock *sk); int rds_tcp_accept_one(struct socket *sock); -int rds_tcp_keepalive(struct socket *sock); +void rds_tcp_keepalive(struct socket *sock); void *rds_tcp_listen_sock_def_readable(struct net *net); /* tcp_recv.c */ diff --git a/net/rds/tcp_listen.c b/net/rds/tcp_listen.c index 9ad555c48d15d..101cf14215a0b 100644 --- a/net/rds/tcp_listen.c +++ b/net/rds/tcp_listen.c @@ -38,27 +38,19 @@ #include "rds.h" #include "tcp.h" -int rds_tcp_keepalive(struct socket *sock) +void rds_tcp_keepalive(struct socket *sock) { /* values below based on xs_udp_default_timeout */ int keepidle = 5; /* send a probe 'keepidle' secs after last data */ int keepcnt = 5; /* number of unack'ed probes before declaring dead */ - int ret = 0; sock_set_keepalive(sock->sk); - - ret = kernel_setsockopt(sock, IPPROTO_TCP, TCP_KEEPCNT, - (char *)&keepcnt, sizeof(keepcnt)); - if (ret < 0) - goto bail; - + tcp_sock_set_keepcnt(sock->sk, keepcnt); tcp_sock_set_keepidle(sock->sk, keepidle); /* KEEPINTVL is the interval between successive probes. We follow * the model in xs_tcp_finish_connecting() and re-use keepidle. */ tcp_sock_set_keepintvl(sock->sk, keepidle); -bail: - return ret; } /* rds_tcp_accept_one_path(): if accepting on cp_index > 0, make sure the @@ -140,10 +132,7 @@ int rds_tcp_accept_one(struct socket *sock) new_sock->ops = sock->ops; __module_get(new_sock->ops->owner); - ret = rds_tcp_keepalive(new_sock); - if (ret < 0) - goto out; - + rds_tcp_keepalive(new_sock); rds_tcp_tune(new_sock); inet = inet_sk(new_sock->sk); diff --git a/net/sunrpc/xprtsock.c b/net/sunrpc/xprtsock.c index 5ca64e12af0c5..0d3ec055bc12f 100644 --- a/net/sunrpc/xprtsock.c +++ b/net/sunrpc/xprtsock.c @@ -2109,8 +2109,7 @@ static void xs_tcp_set_socket_timeouts(struct rpc_xprt *xprt, sock_set_keepalive(sock->sk); tcp_sock_set_keepidle(sock->sk, keepidle); tcp_sock_set_keepintvl(sock->sk, keepidle); - kernel_setsockopt(sock, SOL_TCP, TCP_KEEPCNT, - (char *)&keepcnt, sizeof(keepcnt)); + tcp_sock_set_keepcnt(sock->sk, keepcnt); /* TCP user timeout (see RFC5482) */ tcp_sock_set_user_timeout(sock->sk, timeo);