| Message ID | 20230922092906.2645265-9-haowenchao2@huawei.com (mailing list archive) |
|---|---|
| State | Superseded |
| Headers | show |
| Series | scsi:scsi_debug: Add error injection for single device | expand |
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; > } >
On 2023/10/7 5:04, Douglas Gilbert wrote: > 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/ > >> >> 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 > Would update in next version. Would you continue reviewing patch 9/10 and 10/10?
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; }
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 <haowenchao2@huawei.com> --- drivers/scsi/scsi_debug.c | 39 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 39 insertions(+)