Messages in this thread | | | Date | Fri, 6 Oct 2023 17:04:30 -0400 | Subject | Re: [PATCH v5 08/10] scsi: scsi_debug: Add new error injection reset lun failed | From | Douglas Gilbert <> |
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On 2023-09-22 05:29, Wenchao Hao wrote: > Add error injection type 3 to make scsi_debug_device_reset() return FAILED. > Fail abort command foramt:
s/foramt/format/
> > +--------+------+-------------------------------------------------------+ > | 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}
These examples are misleading. Same with the one in patch 7/10 . The example should be showing an invocation that exercises _this_ patch. So the first byte of the echo should be 4 not the 0 shown above.
Doug Gilbert
> 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 <haowenchao2@huawei.com> > --- > 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; > } >
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