linux-kernel - [RFC PATCH v2 13/19] scsi: scsi_debug: Add param to control target based error handle

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Message-ID: <20230901094127.2010873-14-haowenchao2@huawei.com>
Date:   Fri, 1 Sep 2023 17:41:21 +0800
From:   Wenchao Hao <haowenchao2@...wei.com>
To:     "James E . J . Bottomley" <jejb@...ux.ibm.com>,
        "Martin K . Petersen" <martin.petersen@...cle.com>,
        <linux-scsi@...r.kernel.org>
CC:     Hannes Reinecke <hare@...e.de>, <linux-kernel@...r.kernel.org>,
        <louhongxiang@...wei.com>, <lixiaokeng@...wei.com>,
        Wenchao Hao <haowenchao2@...wei.com>
Subject: [RFC PATCH v2 13/19] scsi: scsi_debug: Add param to control target based error handle

Add new module param target_eh to control if enable target based error
handler, and param target_eh_fallback to control if fallback to further
recover when target recovery can not recover all error commands.
This is used to test the target based error handle.

Signed-off-by: Wenchao Hao <haowenchao2@...wei.com>
---
 drivers/scsi/scsi_debug.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c
index af3d43c9db6f..9a8aa48fb8a4 100644
--- a/drivers/scsi/scsi_debug.c
+++ b/drivers/scsi/scsi_debug.c
@@ -843,6 +843,8 @@ static bool sdebug_statistics = DEF_STATISTICS;
 static bool sdebug_wp;
 static bool sdebug_lun_eh;
 static bool sdebug_lun_eh_fallback;
+static bool sdebug_target_eh;
+static bool sdebug_target_eh_fallback;
 /* Following enum: 0: no zbc, def; 1: host aware; 2: host managed */
 static enum blk_zoned_model sdeb_zbc_model = BLK_ZONED_NONE;
 static char *sdeb_zbc_model_s;
@@ -1137,6 +1139,9 @@ static int sdebug_target_alloc(struct scsi_target *starget)
 
 	starget->hostdata = targetip;
 
+	if (sdebug_target_eh)
+		return scsi_target_setup_eh(starget, sdebug_target_eh_fallback);
+
 	return 0;
 }
 
@@ -1152,6 +1157,9 @@ static void sdebug_target_destroy(struct scsi_target *starget)
 {
 	struct sdebug_target_info *targetip;
 
+	if (sdebug_target_eh)
+		scsi_target_clear_eh(starget);
+
 	targetip = (struct sdebug_target_info *)starget->hostdata;
 	if (targetip) {
 		starget->hostdata = NULL;
@@ -6177,6 +6185,8 @@ module_param_named(zone_nr_conv, sdeb_zbc_nr_conv, int, S_IRUGO);
 module_param_named(zone_size_mb, sdeb_zbc_zone_size_mb, int, S_IRUGO);
 module_param_named(lun_eh, sdebug_lun_eh, bool, S_IRUGO);
 module_param_named(lun_eh_fallback, sdebug_lun_eh_fallback, bool, S_IRUGO);
+module_param_named(target_eh, sdebug_target_eh, bool, S_IRUGO);
+module_param_named(target_eh_fallback, sdebug_target_eh_fallback, bool, S_IRUGO);
 
 MODULE_AUTHOR("Eric Youngdale + Douglas Gilbert");
 MODULE_DESCRIPTION("SCSI debug adapter driver");
@@ -6251,6 +6261,8 @@ MODULE_PARM_DESC(zone_nr_conv, "Number of conventional zones (def=1)");
 MODULE_PARM_DESC(zone_size_mb, "Zone size in MiB (def=auto)");
 MODULE_PARM_DESC(lun_eh, "LUN based error handle (def=0)");
 MODULE_PARM_DESC(lun_eh_fallback, "Fallback to further recovery if LUN recovery failed (def=0)");
+MODULE_PARM_DESC(target_eh, "target based error handle (def=0)");
+MODULE_PARM_DESC(target_eh_fallback, "Fallback to further recovery if target recovery failed (def=0)");
 
 #define SDEBUG_INFO_LEN 256
 static char sdebug_info[SDEBUG_INFO_LEN];
-- 
2.35.3