From patchwork Fri Sep 22 09:29:04 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wenchao Hao X-Patchwork-Id: 725558 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 EBCF3CD4F42 for ; Fri, 22 Sep 2023 09:30:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233065AbjIVJal (ORCPT ); Fri, 22 Sep 2023 05:30:41 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35144 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233057AbjIVJ3y (ORCPT ); Fri, 22 Sep 2023 05:29:54 -0400 Received: from szxga02-in.huawei.com (szxga02-in.huawei.com [45.249.212.188]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BBA2C1A8; Fri, 22 Sep 2023 02:29:39 -0700 (PDT) Received: from kwepemm000012.china.huawei.com (unknown [172.30.72.56]) by szxga02-in.huawei.com (SkyGuard) with ESMTP id 4RsRjS5Mw5zVk46; Fri, 22 Sep 2023 17:26:36 +0800 (CST) Received: from build.huawei.com (10.175.101.6) by kwepemm000012.china.huawei.com (7.193.23.142) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.31; Fri, 22 Sep 2023 17:29:37 +0800 From: Wenchao Hao To: "James E . J . Bottomley" , "Martin K . Petersen" , Douglas Gilbert , , CC: , , Wenchao Hao Subject: [PATCH v5 08/10] scsi: scsi_debug: Add new error injection reset lun failed Date: Fri, 22 Sep 2023 17:29:04 +0800 Message-ID: <20230922092906.2645265-9-haowenchao2@huawei.com> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20230922092906.2645265-1-haowenchao2@huawei.com> References: <20230922092906.2645265-1-haowenchao2@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.175.101.6] X-ClientProxiedBy: dggems703-chm.china.huawei.com (10.3.19.180) To kwepemm000012.china.huawei.com (7.193.23.142) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org Add error injection type 3 to make scsi_debug_device_reset() return FAILED. Fail abort command foramt: +--------+------+-------------------------------------------------------+ | Column | Type | Description | +--------+------+-------------------------------------------------------+ | 1 | u8 | Error type, fixed to 0x4 | +--------+------+-------------------------------------------------------+ | 2 | s32 | Error count | | | | 0: this rule will be ignored | | | | positive: the rule will always take effect | | | | negative: the rule takes effect n times where -n is | | | | the value given. Ignored after n times | +--------+------+-------------------------------------------------------+ | 3 | x8 | SCSI command opcode, 0xff for all commands | +--------+------+-------------------------------------------------------+ Examples: error=/sys/kernel/debug/scsi_debug/0:0:0:1/error echo "0 -10 0x12" > ${error} will make the device return FAILED when try to reset lun with inquiry command 10 times. error=/sys/kernel/debug/scsi_debug/0:0:0:1/error echo "0 -10 0xff" > ${error} will make the device return FAILED when try to reset lun 10 times. Usually we do not care about what command it is when trying to perform reset LUN, so 0xff could be applied. Signed-off-by: Wenchao Hao --- drivers/scsi/scsi_debug.c | 39 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 39 insertions(+) diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c index 8a16cb9642a6..db8ab6cad078 100644 --- a/drivers/scsi/scsi_debug.c +++ b/drivers/scsi/scsi_debug.c @@ -295,6 +295,8 @@ enum sdebug_err_type { /* with errors set in scsi_cmnd */ ERR_ABORT_CMD_FAILED = 3, /* control return FAILED from */ /* scsi_debug_abort() */ + ERR_LUN_RESET_FAILED = 4, /* control return FAILED from */ + /* scsi_debug_device_reseLUN_RESET_FAILEDt() */ }; struct sdebug_err_inject { @@ -973,6 +975,7 @@ static int sdebug_error_show(struct seq_file *m, void *p) switch (err->type) { case ERR_TMOUT_CMD: case ERR_ABORT_CMD_FAILED: + case ERR_LUN_RESET_FAILED: seq_printf(m, "%d\t%d\t0x%x\n", err->type, err->cnt, err->cmd); break; @@ -1035,6 +1038,7 @@ static ssize_t sdebug_error_write(struct file *file, const char __user *ubuf, switch (inject_type) { case ERR_TMOUT_CMD: case ERR_ABORT_CMD_FAILED: + case ERR_LUN_RESET_FAILED: if (sscanf(buf, "%d %d %hhx", &inject->type, &inject->cnt, &inject->cmd) != 3) goto out_error; @@ -5578,10 +5582,40 @@ static void scsi_debug_stop_all_queued(struct scsi_device *sdp) scsi_debug_stop_all_queued_iter, sdp); } +static int sdebug_fail_lun_reset(struct scsi_cmnd *cmnd) +{ + struct scsi_device *sdp = cmnd->device; + struct sdebug_dev_info *devip = (struct sdebug_dev_info *)sdp->hostdata; + struct sdebug_err_inject *err; + unsigned char *cmd = cmnd->cmnd; + int ret = 0; + + if (devip == NULL) + return 0; + + rcu_read_lock(); + list_for_each_entry_rcu(err, &devip->inject_err_list, list) { + if (err->type == ERR_LUN_RESET_FAILED && + (err->cmd == cmd[0] || err->cmd == 0xff)) { + ret = !!err->cnt; + if (err->cnt < 0) + err->cnt++; + + rcu_read_unlock(); + return ret; + } + } + rcu_read_unlock(); + + return 0; +} + static int scsi_debug_device_reset(struct scsi_cmnd *SCpnt) { struct scsi_device *sdp = SCpnt->device; struct sdebug_dev_info *devip = sdp->hostdata; + u8 *cmd = SCpnt->cmnd; + u8 opcode = cmd[0]; ++num_dev_resets; @@ -5592,6 +5626,11 @@ static int scsi_debug_device_reset(struct scsi_cmnd *SCpnt) if (devip) set_bit(SDEBUG_UA_POR, devip->uas_bm); + if (sdebug_fail_lun_reset(SCpnt)) { + scmd_printk(KERN_INFO, SCpnt, "fail lun reset 0x%x\n", opcode); + return FAILED; + } + return SUCCESS; }