From mboxrd@z Thu Jan 1 00:00:00 1970 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 CFC15C433F5 for ; Mon, 29 Nov 2021 22:45:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235131AbhK2Wsd (ORCPT ); Mon, 29 Nov 2021 17:48:33 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36378 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235280AbhK2Wrt (ORCPT ); Mon, 29 Nov 2021 17:47:49 -0500 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D4324C047CC5; Mon, 29 Nov 2021 10:31:08 -0800 (PST) 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 ams.source.kernel.org (Postfix) with ESMTPS id 9D890B815B1; Mon, 29 Nov 2021 18:31:07 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id D000BC53FAD; Mon, 29 Nov 2021 18:31:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1638210666; bh=FizMX89KWAN1teQcdmUbzyU2kTMzyQmu95FLWYJismY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Udlj4nlmcO3/3IX4gx3SDODzvvn3lHuif9gBuX2fJxa9aJl4Y0o8VYq28ryBYZyZW jneciQNAPa0gtBkf9YT1TYR/H7YlashWp1i/SoiBNi84MmZTGVPQbJ9S6+kTTnrdUv Ve1CtxeKKgNBBaIuKYE4ReCvxCclbfz1L15jfDq8= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Tony Lu , Wen Gu , "David S. Miller" , Sasha Levin Subject: [PATCH 5.10 075/121] net/smc: Ensure the active closing peer first closes clcsock Date: Mon, 29 Nov 2021 19:18:26 +0100 Message-Id: <20211129181714.178011422@linuxfoundation.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20211129181711.642046348@linuxfoundation.org> References: <20211129181711.642046348@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Tony Lu [ Upstream commit 606a63c9783a32a45bd2ef0eee393711d75b3284 ] The side that actively closed socket, it's clcsock doesn't enter TIME_WAIT state, but the passive side does it. It should show the same behavior as TCP sockets. Consider this, when client actively closes the socket, the clcsock in server enters TIME_WAIT state, which means the address is occupied and won't be reused before TIME_WAIT dismissing. If we restarted server, the service would be unavailable for a long time. To solve this issue, shutdown the clcsock in [A], perform the TCP active close progress first, before the passive closed side closing it. So that the actively closed side enters TIME_WAIT, not the passive one. Client | Server close() // client actively close | smc_release() | smc_close_active() // PEERCLOSEWAIT1 | smc_close_final() // abort or closed = 1| smc_cdc_get_slot_and_msg_send() | [A] | |smc_cdc_msg_recv_action() // ACTIVE | queue_work(smc_close_wq, &conn->close_work) | smc_close_passive_work() // PROCESSABORT or APPCLOSEWAIT1 | smc_close_passive_abort_received() // only in abort | |close() // server recv zero, close | smc_release() // PROCESSABORT or APPCLOSEWAIT1 | smc_close_active() | smc_close_abort() or smc_close_final() // CLOSED | smc_cdc_get_slot_and_msg_send() // abort or closed = 1 smc_cdc_msg_recv_action() | smc_clcsock_release() queue_work(smc_close_wq, &conn->close_work) | sock_release(tcp) // actively close clc, enter TIME_WAIT smc_close_passive_work() // PEERCLOSEWAIT1 | smc_conn_free() smc_close_passive_abort_received() // CLOSED| smc_conn_free() | smc_clcsock_release() | sock_release(tcp) // passive close clc | Link: https://www.spinics.net/lists/netdev/msg780407.html Fixes: b38d732477e4 ("smc: socket closing and linkgroup cleanup") Signed-off-by: Tony Lu Reviewed-by: Wen Gu Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- net/smc/smc_close.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/net/smc/smc_close.c b/net/smc/smc_close.c index 0f9ffba07d268..04620b53b74a7 100644 --- a/net/smc/smc_close.c +++ b/net/smc/smc_close.c @@ -228,6 +228,12 @@ int smc_close_active(struct smc_sock *smc) /* send close request */ rc = smc_close_final(conn); sk->sk_state = SMC_PEERCLOSEWAIT1; + + /* actively shutdown clcsock before peer close it, + * prevent peer from entering TIME_WAIT state. + */ + if (smc->clcsock && smc->clcsock->sk) + rc = kernel_sock_shutdown(smc->clcsock, SHUT_RDWR); } else { /* peer event has changed the state */ goto again; -- 2.33.0