From patchwork Wed May 13 06:26:28 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 11545101 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 9EB0C14B4 for ; Wed, 13 May 2020 06:32:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8735E206A5 for ; Wed, 13 May 2020 06:32:35 +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="eiafrt7n" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729822AbgEMG2M (ORCPT ); Wed, 13 May 2020 02:28:12 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46018 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729679AbgEMG2L (ORCPT ); Wed, 13 May 2020 02:28:11 -0400 Received: from bombadil.infradead.org (bombadil.infradead.org [IPv6:2607:7c80:54:e::133]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DFF98C061A0E; Tue, 12 May 2020 23:28:10 -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=8TT2PxSsEHipT+e5nSL6DhUaWirp80j0qmDh4nmGKY8=; b=eiafrt7nHqCNDveJ9gIe9E9pgO QmFtEivvTMNAlSTpjQqGiinbccIYJpAjA983x/pBULlX0DWFGtN3Ue6Kc9mUgY54gWgOhle20hcvG 7Q/l8DlKedLblAfymab8XyOufMUKyts5b5yvP77ZC/rCin0PckQdwJWVhLWch3GSstZDgTm98DOpF fCErxg2KksDxfRgQJn3oF+4/yUQk1b6vp899x1/0FRbNu8DjSUuUDC5F0CX2PZKpzmQv6hrjeuVi3 U8ob0+DxLHA7yij0KM2glbwmY2qM4h6gKGd6viPFEFRxjYk5SZWfg2NIK2Q5B9jMAOEW0oYtlOh0Q 2F2vwKTw==; Received: from [2001:4bb8:180:9d3f:c70:4a89:bc61:2] (helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1jYkra-0004KK-Q3; Wed, 13 May 2020 06:27:31 +0000 From: Christoph Hellwig To: "David S. Miller" , Jakub Kicinski Cc: Eric Dumazet , Alexey Kuznetsov , Hideaki YOSHIFUJI , Vlad Yasevich , Neil Horman , Marcelo Ricardo Leitner , Jon Maloy , Ying Xue , drbd-dev@lists.linbit.com, linux-block@vger.kernel.org, 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, linux-sctp@vger.kernel.org, ceph-devel@vger.kernel.org, rds-devel@oss.oracle.com, linux-nfs@vger.kernel.org Subject: [PATCH 13/33] tcp: add tcp_sock_set_syncnt Date: Wed, 13 May 2020 08:26:28 +0200 Message-Id: <20200513062649.2100053-14-hch@lst.de> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200513062649.2100053-1-hch@lst.de> References: <20200513062649.2100053-1-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_SYNCNT sockopt from kernel space without going through a fake uaccess. Signed-off-by: Christoph Hellwig --- drivers/nvme/host/tcp.c | 9 +-------- include/linux/tcp.h | 1 + net/ipv4/tcp.c | 12 ++++++++++++ 3 files changed, 14 insertions(+), 8 deletions(-) diff --git a/drivers/nvme/host/tcp.c b/drivers/nvme/host/tcp.c index a8070f93fd0a0..8417eeb83fcd2 100644 --- a/drivers/nvme/host/tcp.c +++ b/drivers/nvme/host/tcp.c @@ -1336,14 +1336,7 @@ static int nvme_tcp_alloc_queue(struct nvme_ctrl *nctrl, } /* Single syn retry */ - opt = 1; - ret = kernel_setsockopt(queue->sock, IPPROTO_TCP, TCP_SYNCNT, - (char *)&opt, sizeof(opt)); - if (ret) { - dev_err(nctrl->device, - "failed to set TCP_SYNCNT sock opt %d\n", ret); - goto err_sock; - } + tcp_sock_set_syncnt(queue->sock->sk, 1); /* Set TCP no delay */ tcp_sock_set_nodelay(queue->sock->sk, true); diff --git a/include/linux/tcp.h b/include/linux/tcp.h index e7ab6da5111b5..77b832acf3398 100644 --- a/include/linux/tcp.h +++ b/include/linux/tcp.h @@ -497,5 +497,6 @@ int tcp_skb_shift(struct sk_buff *to, struct sk_buff *from, int pcount, void tcp_sock_set_cork(struct sock *sk, bool on); void tcp_sock_set_nodelay(struct sock *sk, bool on); void tcp_sock_set_quickack(struct sock *sk, int val); +int tcp_sock_set_syncnt(struct sock *sk, int val); #endif /* _LINUX_TCP_H */ diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c index c681f43f0bb85..773b5cd366ab7 100644 --- a/net/ipv4/tcp.c +++ b/net/ipv4/tcp.c @@ -2870,6 +2870,18 @@ void tcp_sock_set_quickack(struct sock *sk, int val) } EXPORT_SYMBOL(tcp_sock_set_quickack); +int tcp_sock_set_syncnt(struct sock *sk, int val) +{ + if (val < 1 || val > MAX_TCP_SYNCNT) + return -EINVAL; + + lock_sock(sk); + inet_csk(sk)->icsk_syn_retries = val; + release_sock(sk); + return 0; +} +EXPORT_SYMBOL(tcp_sock_set_syncnt); + /* * Socket option code for TCP. */