If a timeout error is injected, return 0 from scsi_debug_queuecommand to
make the command timeout.
Timeout SCSI command format:
+--------+------+-------------------------------------------------------+
| Column | Type | Description |
+--------+------+-------------------------------------------------------+
| 1 | u8 | Error type, fixed to 0x0 |
+--------+------+-------------------------------------------------------+
| 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's inquiry command timeout 10 times.
echo "0 1 0x12" > ${error}
will make the device's inquiry timeout each time it is invoked on this
device.
Acked-by: Douglas Gilbert <dgilb...@interlog.com>
Signed-off-by: Wenchao Hao <haowench...@huawei.com>
---
drivers/scsi/scsi_debug.c | 34 ++++++++++++++++++++++++++++++++++
1 file changed, 34 insertions(+)
diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c
index 6235e828c430..785ad5e5b4a4 100644
--- a/drivers/scsi/scsi_debug.c
+++ b/drivers/scsi/scsi_debug.c
@@ -7731,6 +7731,34 @@ static int sdebug_blk_mq_poll(struct Scsi_Host *shost,
unsigned int queue_num)
return num_entries;
}
+static int sdebug_timeout_cmd(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_TMOUT_CMD &&
+ (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_queuecommand(struct Scsi_Host *shost,
struct scsi_cmnd *scp)
{
@@ -7789,6 +7817,12 @@ static int scsi_debug_queuecommand(struct Scsi_Host
*shost,
if (NULL == devip)
goto err_out;
}
+
+ if (sdebug_timeout_cmd(scp)) {
+ scmd_printk(KERN_INFO, scp, "timeout command 0x%x\n", opcode);
+ return 0;
+ }
+
if (unlikely(inject_now && !atomic_read(&sdeb_inject_pending)))
atomic_set(&sdeb_inject_pending, 1);
--
2.32.0
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