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author | Wenchao Hao <haowenchao2@huawei.com> | 2023-10-10 17:20:45 +0800 |
---|---|---|
committer | Martin K. Petersen <martin.petersen@oracle.com> | 2023-10-16 20:50:11 -0400 |
commit | 32be8b6e22eb76a08c66414593ef02d5eb151be7 (patch) | |
tree | 1ac1e7e429442931dc115c8ad725dee0371f36c6 /drivers/scsi/scsi_debug.c | |
parent | 962d77cd4c852e6a34ffd44fc5f32ba678e02633 (diff) | |
download | linux-32be8b6e22eb76a08c66414593ef02d5eb151be7.tar.gz linux-32be8b6e22eb76a08c66414593ef02d5eb151be7.tar.bz2 linux-32be8b6e22eb76a08c66414593ef02d5eb151be7.zip |
scsi: scsi_debug: Time out command if the error is injected
If a timeout error is injected, return 0 from scsi_debug_queuecommand to
make the command time out.
Time out 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 time out 10 times.
echo "0 1 0x12" > ${error}
will make the device's inquiry time out each time it is invoked on this
device.
Acked-by: Douglas Gilbert <dgilbert@interlog.com>
Signed-off-by: Wenchao Hao <haowenchao2@huawei.com>
Link: https://lore.kernel.org/r/20231010092051.608007-5-haowenchao2@huawei.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi/scsi_debug.c')
-rw-r--r-- | drivers/scsi/scsi_debug.c | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c index 0d5a179dbd97..9081c9d22882 100644 --- a/drivers/scsi/scsi_debug.c +++ b/drivers/scsi/scsi_debug.c @@ -7741,6 +7741,34 @@ 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) { @@ -7799,6 +7827,12 @@ 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); |