From patchwork Mon Sep 21 18:48:28 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mike Christie X-Patchwork-Id: 257568 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=-14.3 required=3.0 tests=BAYES_00,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, UNPARSEABLE_RELAY,USER_AGENT_GIT 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 88DA8C4346E for ; Mon, 21 Sep 2020 18:48:44 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4520F21D91 for ; Mon, 21 Sep 2020 18:48:44 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=oracle.com header.i=@oracle.com header.b="tSXtYzpV" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727728AbgIUSso (ORCPT ); Mon, 21 Sep 2020 14:48:44 -0400 Received: from aserp2120.oracle.com ([141.146.126.78]:52032 "EHLO aserp2120.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726395AbgIUSsn (ORCPT ); Mon, 21 Sep 2020 14:48:43 -0400 Received: from pps.filterd (aserp2120.oracle.com [127.0.0.1]) by aserp2120.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 08LIj7cn036706; Mon, 21 Sep 2020 18:48:40 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=from : to : subject : date : message-id : in-reply-to : references; s=corp-2020-01-29; bh=dRWoBIwR+gO68igjnDsYw5R5fDp8FVYwOq2frGt4QxI=; b=tSXtYzpViWKLdl/eV8Ds74F+K7LPksYnzPvGNdMI2PGskwH5M3KU/jwX/ILPqCa1YiZe KTL6IfnqVKpkUEjN/SGjhRrtQxWV4NqJ/AJUjfLWtLbRPZa0qENcGsL14CohWJAUOtJU 7KTRZVaFDUo1OZoPcazeLs9Qrlt1FLtQQrFv7oq7hW7OM2BncEKVTi8WLIQCAstCCRKd u9eB1rL8/BnnF2W4HfYhYHb5x9VyJyymaoFevPQmObIH7x7jNwjJmv+/REyRlnnKL7b6 fNSz/IvgcPh7TesY4+TupLkk2vTfzW3qjZa1J2T5ndYSFqVnzcIQMgE19fU06DIB/3bW lQ== Received: from userp3020.oracle.com (userp3020.oracle.com [156.151.31.79]) by aserp2120.oracle.com with ESMTP id 33n9xkr2w5-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Mon, 21 Sep 2020 18:48:40 +0000 Received: from pps.filterd (userp3020.oracle.com [127.0.0.1]) by userp3020.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 08LIkJPu173998; Mon, 21 Sep 2020 18:48:39 GMT Received: from userv0122.oracle.com (userv0122.oracle.com [156.151.31.75]) by userp3020.oracle.com with ESMTP id 33nurrag43-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 21 Sep 2020 18:48:39 +0000 Received: from abhmp0003.oracle.com (abhmp0003.oracle.com [141.146.116.9]) by userv0122.oracle.com (8.14.4/8.14.4) with ESMTP id 08LImbhe030867; Mon, 21 Sep 2020 18:48:38 GMT Received: from ol2.localdomain (/73.88.28.6) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Mon, 21 Sep 2020 11:48:37 -0700 From: Mike Christie To: martin.petersen@oracle.com, linux-scsi@vger.kernel.org, james.bottomley@hansenpartnership.com Subject: [PATCH 1/2] scsi: Add limitless cmd retry support Date: Mon, 21 Sep 2020 13:48:28 -0500 Message-Id: <1600714109-6178-2-git-send-email-michael.christie@oracle.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1600714109-6178-1-git-send-email-michael.christie@oracle.com> References: <1600714109-6178-1-git-send-email-michael.christie@oracle.com> X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9751 signatures=668679 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 adultscore=0 malwarescore=0 phishscore=0 mlxlogscore=999 bulkscore=0 mlxscore=0 suspectscore=0 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2009210135 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9751 signatures=668679 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 lowpriorityscore=0 malwarescore=0 suspectscore=0 priorityscore=1501 adultscore=0 spamscore=0 clxscore=1015 mlxlogscore=999 bulkscore=0 mlxscore=0 phishscore=0 impostorscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2009210135 Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org The next patch allows users to configure disk scsi cmd retries from -1 up to a ULD specific value where -1 means infinite retries. This patch adds infinite retry support to scsi-ml by just combining common checks for retries into some helper functions, and then checking for the -1/SCSI_CMD_RETRIES_NO_LIMIT. Signed-off-by: Mike Christie --- drivers/scsi/scsi_error.c | 21 +++++++++++++++------ drivers/scsi/scsi_lib.c | 29 +++++++++++++++++++---------- drivers/scsi/scsi_priv.h | 1 + 3 files changed, 35 insertions(+), 16 deletions(-) diff --git a/drivers/scsi/scsi_error.c b/drivers/scsi/scsi_error.c index 927b1e641842..8d237152581f 100644 --- a/drivers/scsi/scsi_error.c +++ b/drivers/scsi/scsi_error.c @@ -116,6 +116,14 @@ static int scsi_host_eh_past_deadline(struct Scsi_Host *shost) return 1; } +static bool scsi_cmd_retry_allowed(struct scsi_cmnd *cmd) +{ + if (cmd->allowed == SCSI_CMD_RETRIES_NO_LIMIT) + return true; + + return (++cmd->retries <= cmd->allowed); +} + /** * scmd_eh_abort_handler - Handle command aborts * @work: command to be aborted. @@ -151,7 +159,7 @@ scmd_eh_abort_handler(struct work_struct *work) "eh timeout, not retrying " "aborted command\n")); } else if (!scsi_noretry_cmd(scmd) && - (++scmd->retries <= scmd->allowed)) { + scsi_cmd_retry_allowed(scmd)) { SCSI_LOG_ERROR_RECOVERY(3, scmd_printk(KERN_WARNING, scmd, "retry aborted command\n")); @@ -1268,7 +1276,10 @@ int scsi_eh_get_sense(struct list_head *work_q, * finished with the sense data, so set * retries to the max allowed to ensure it * won't get reissued */ - scmd->retries = scmd->allowed; + if (scmd->allowed == SCSI_CMD_RETRIES_NO_LIMIT) + scmd->retries = scmd->allowed = 1; + else + scmd->retries = scmd->allowed; else if (rtn != NEEDS_RETRY) continue; @@ -1944,8 +1955,7 @@ int scsi_decide_disposition(struct scsi_cmnd *scmd) * the request was not marked fast fail. Note that above, * even if the request is marked fast fail, we still requeue * for queue congestion conditions (QUEUE_FULL or BUSY) */ - if ((++scmd->retries) <= scmd->allowed - && !scsi_noretry_cmd(scmd)) { + if (scsi_cmd_retry_allowed(scmd) && !scsi_noretry_cmd(scmd)) { return NEEDS_RETRY; } else { /* @@ -2091,8 +2101,7 @@ void scsi_eh_flush_done_q(struct list_head *done_q) list_for_each_entry_safe(scmd, next, done_q, eh_entry) { list_del_init(&scmd->eh_entry); if (scsi_device_online(scmd->device) && - !scsi_noretry_cmd(scmd) && - (++scmd->retries <= scmd->allowed)) { + !scsi_noretry_cmd(scmd) && scsi_cmd_retry_allowed(scmd)) { SCSI_LOG_ERROR_RECOVERY(3, scmd_printk(KERN_INFO, scmd, "%s: flush retry cmd\n", diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c index 06056e9ec333..37b953553362 100644 --- a/drivers/scsi/scsi_lib.c +++ b/drivers/scsi/scsi_lib.c @@ -653,6 +653,23 @@ static void scsi_io_completion_reprep(struct scsi_cmnd *cmd, scsi_mq_requeue_cmd(cmd); } +static bool scsi_cmd_runtime_exceeced(struct scsi_cmnd *cmd) +{ + struct request *req = cmd->request; + unsigned long wait_for; + + if (cmd->allowed == SCSI_CMD_RETRIES_NO_LIMIT) + return false; + + wait_for = (cmd->allowed + 1) * req->timeout; + if (time_before(cmd->jiffies_at_alloc + wait_for, jiffies)) { + scmd_printk(KERN_ERR, cmd, "timing out command, waited %lus\n", + wait_for/HZ); + return true; + } + return false; +} + /* Helper for scsi_io_completion() when special action required. */ static void scsi_io_completion_action(struct scsi_cmnd *cmd, int result) { @@ -661,7 +678,6 @@ static void scsi_io_completion_action(struct scsi_cmnd *cmd, int result) int level = 0; enum {ACTION_FAIL, ACTION_REPREP, ACTION_RETRY, ACTION_DELAYED_RETRY} action; - unsigned long wait_for = (cmd->allowed + 1) * req->timeout; struct scsi_sense_hdr sshdr; bool sense_valid; bool sense_current = true; /* false implies "deferred sense" */ @@ -766,8 +782,7 @@ static void scsi_io_completion_action(struct scsi_cmnd *cmd, int result) } else action = ACTION_FAIL; - if (action != ACTION_FAIL && - time_before(cmd->jiffies_at_alloc + wait_for, jiffies)) + if (action != ACTION_FAIL && scsi_cmd_runtime_exceeced(cmd)) action = ACTION_FAIL; switch (action) { @@ -1440,7 +1455,6 @@ static bool scsi_mq_lld_busy(struct request_queue *q) static void scsi_softirq_done(struct request *rq) { struct scsi_cmnd *cmd = blk_mq_rq_to_pdu(rq); - unsigned long wait_for = (cmd->allowed + 1) * rq->timeout; int disposition; INIT_LIST_HEAD(&cmd->eh_entry); @@ -1450,13 +1464,8 @@ static void scsi_softirq_done(struct request *rq) atomic_inc(&cmd->device->ioerr_cnt); disposition = scsi_decide_disposition(cmd); - if (disposition != SUCCESS && - time_before(cmd->jiffies_at_alloc + wait_for, jiffies)) { - scmd_printk(KERN_ERR, cmd, - "timing out command, waited %lus\n", - wait_for/HZ); + if (disposition != SUCCESS && scsi_cmd_runtime_exceeced(cmd)) disposition = SUCCESS; - } scsi_log_completion(cmd, disposition); diff --git a/drivers/scsi/scsi_priv.h b/drivers/scsi/scsi_priv.h index 22b6585e28b4..f8c46cc82e9f 100644 --- a/drivers/scsi/scsi_priv.h +++ b/drivers/scsi/scsi_priv.h @@ -15,6 +15,7 @@ struct scsi_host_template; struct Scsi_Host; struct scsi_nl_hdr; +#define SCSI_CMD_RETRIES_NO_LIMIT -1 /* * Scsi Error Handler Flags