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 X-Spam-Level: X-Spam-Status: No, score=-8.4 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 719C0C3A589 for ; Thu, 15 Aug 2019 14:43:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 4348E2086C for ; Thu, 15 Aug 2019 14:43:24 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=oracle.com header.i=@oracle.com header.b="eOgN4SQC" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731995AbfHOOnX (ORCPT ); Thu, 15 Aug 2019 10:43:23 -0400 Received: from userp2130.oracle.com ([156.151.31.86]:58542 "EHLO userp2130.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729838AbfHOOnX (ORCPT ); Thu, 15 Aug 2019 10:43:23 -0400 Received: from pps.filterd (userp2130.oracle.com [127.0.0.1]) by userp2130.oracle.com (8.16.0.27/8.16.0.27) with SMTP id x7FEVWdN083341; Thu, 15 Aug 2019 14:43:21 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=from : subject : to : cc : references : message-id : date : mime-version : in-reply-to : content-type : content-transfer-encoding; s=corp-2019-08-05; bh=nMsYPMoYmwV5SXmTmk2bacMSb5F8g0yBpO2XL1HPzdc=; b=eOgN4SQCD5smuqGpRSaabM1gSFcgFmtjsTC2Zh4ov5ozVCJa5x1JzwblDSBwiBZs77+j K0G0vB7i8aezm7owRG2xpC3UcgcWmgR39F53GMACQneCKXPVugqVA9oAG56xX2KhsfIc sJPBxRpiexrDrHWpJpqfpRI3xeO4xQDbpzI8iNQAGp2a+JLVRsBltdaQSRCGc1rQ/YdG P/iQcDZfmzIntSUAfY/90gWusbUFNiNghYVB6dtn0PPB9y7snz9yJ5HOexYS3Gf1QVym 1DE0IiMc1NsqqWTvUmWOi4n3IzHlcrp9iD6mfxtZTnPrrtySeAWbhDfqtbfvJMo1LwkF sw== Received: from userp3020.oracle.com (userp3020.oracle.com [156.151.31.79]) by userp2130.oracle.com with ESMTP id 2u9nbtu4r7-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 15 Aug 2019 14:43:21 +0000 Received: from pps.filterd (userp3020.oracle.com [127.0.0.1]) by userp3020.oracle.com (8.16.0.27/8.16.0.27) with SMTP id x7FEXa9D172227; Thu, 15 Aug 2019 14:43:20 GMT Received: from pps.reinject (localhost [127.0.0.1]) by userp3020.oracle.com with ESMTP id 2ucgf1325c-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Thu, 15 Aug 2019 14:43:20 +0000 Received: from userp3020.oracle.com (userp3020.oracle.com [127.0.0.1]) by pps.reinject (8.16.0.27/8.16.0.27) with SMTP id x7FEhKuP003067; Thu, 15 Aug 2019 14:43:20 GMT Received: from aserv0122.oracle.com (aserv0122.oracle.com [141.146.126.236]) by userp3020.oracle.com with ESMTP id 2ucgf1324t-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 15 Aug 2019 14:43:20 +0000 Received: from abhmp0008.oracle.com (abhmp0008.oracle.com [141.146.116.14]) by aserv0122.oracle.com (8.14.4/8.14.4) with ESMTP id x7FEhJRe025300; Thu, 15 Aug 2019 14:43:19 GMT Received: from [10.159.252.166] (/10.159.252.166) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Thu, 15 Aug 2019 07:43:19 -0700 From: Gerd Rausch Subject: [PATCH net-next v2 4/4] rds: check for excessive looping in rds_send_xmit To: Santosh Shilimkar , netdev@vger.kernel.org, linux-rdma@vger.kernel.org, rds-devel@oss.oracle.com Cc: David Miller References: <20190814.212525.326606319186601317.davem@davemloft.net> Message-ID: Date: Thu, 15 Aug 2019 07:43:15 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=windows-1252 Content-Language: en-US Content-Transfer-Encoding: 7bit X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9350 signatures=668684 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1906280000 definitions=main-1908150148 Sender: linux-rdma-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org From: Andy Grover Date: Thu, 13 Jan 2011 11:40:31 -0800 Original commit from 2011 updated to include a change by Yuval Shaia that adds a new statistic counter "send_stuck_rm" to capture the messages looping exessively in the send path. Signed-off-by: Gerd Rausch --- net/rds/rds.h | 2 +- net/rds/send.c | 12 ++++++++++++ net/rds/stats.c | 1 + 3 files changed, 14 insertions(+), 1 deletion(-) diff --git a/net/rds/rds.h b/net/rds/rds.h index f0066d168499..ad605fd61655 100644 --- a/net/rds/rds.h +++ b/net/rds/rds.h @@ -717,7 +717,7 @@ struct rds_statistics { uint64_t s_cong_send_blocked; uint64_t s_recv_bytes_added_to_socket; uint64_t s_recv_bytes_removed_from_socket; - + uint64_t s_send_stuck_rm; }; /* af_rds.c */ diff --git a/net/rds/send.c b/net/rds/send.c index 031b1e97a466..9ce552abf9e9 100644 --- a/net/rds/send.c +++ b/net/rds/send.c @@ -145,6 +145,7 @@ int rds_send_xmit(struct rds_conn_path *cp) LIST_HEAD(to_be_dropped); int batch_count; unsigned long send_gen = 0; + int same_rm = 0; restart: batch_count = 0; @@ -200,6 +201,17 @@ int rds_send_xmit(struct rds_conn_path *cp) rm = cp->cp_xmit_rm; + if (!rm) { + same_rm = 0; + } else { + same_rm++; + if (same_rm >= 4096) { + rds_stats_inc(s_send_stuck_rm); + ret = -EAGAIN; + break; + } + } + /* * If between sending messages, we can send a pending congestion * map update. diff --git a/net/rds/stats.c b/net/rds/stats.c index 6bbab4d74c4f..9e87da43c004 100644 --- a/net/rds/stats.c +++ b/net/rds/stats.c @@ -78,6 +78,7 @@ static const char *const rds_stat_names[] = { "cong_send_blocked", "recv_bytes_added_to_sock", "recv_bytes_freed_fromsock", + "send_stuck_rm", }; void rds_stats_info_copy(struct rds_info_iterator *iter, -- 2.22.1