linux-kernel - Re: [PATCH v2] scsi: trace: change the rtn log in string

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Message-ID: <6cb1b494-7054-427d-bb28-77a8a65ee0e3@quicinc.com>
Date: Mon, 19 May 2025 17:37:43 +0800
From: Kassey Li quic <quic_yingangl@...cinc.com>
To: James Bottomley <James.Bottomley@...senPartnership.com>,
        <rostedt@...dmis.org>, <martin.petersen@...cle.com>,
        <mathieu.desnoyers@...icios.com>, <linux-kernel@...r.kernel.org>,
        <linux-trace-kernel@...r.kernel.org>, <linux-scsi@...r.kernel.org>
Subject: Re: [PATCH v2] scsi: trace: change the rtn log in string



On 2025/5/14 21:39, James Bottomley wrote:
> On Wed, 2025-05-14 at 15:44 +0800, Kassey Li wrote:
>> In default it showed rtn in decimal.
>>
>> kworker/3:1H-183 [003] ....  51.035474: scsi_dispatch_cmd_error:
>> host_no=0 channel=0 id=0 lun=4 data_sgl=1  prot_sgl=0
>> prot_op=SCSI_PROT_NORMAL cmnd=(READ_10 lba=3907214  txlen=1 protect=0
>> raw=28 00 00 3b 9e 8e 00 00 01 00) rtn=4181
>>
>> In source code we define these possible value as hexadecimal:
>>
>> include/scsi/scsi.h
>>
>> SCSI_MLQUEUE_HOST_BUSY   0x1055
>> SCSI_MLQUEUE_DEVICE_BUSY 0x1056
>> SCSI_MLQUEUE_EH_RETRY    0x1057
>> SCSI_MLQUEUE_TARGET_BUSY 0x1058
>>
>> This change shows the string type.
>>
>> Signed-off-by: Kassey Li <quic_yingangl@...cinc.com>
>> ---
>>   include/trace/events/scsi.h | 8 ++++++--
>>   1 file changed, 6 insertions(+), 2 deletions(-)
>>
>> diff --git a/include/trace/events/scsi.h
>> b/include/trace/events/scsi.h
>> index bf6cc98d9122..56987f98ba4a 100644
>> --- a/include/trace/events/scsi.h
>> +++ b/include/trace/events/scsi.h
>> @@ -240,14 +240,18 @@ TRACE_EVENT(scsi_dispatch_cmd_error,
>>   
>>   	TP_printk("host_no=%u channel=%u id=%u lun=%u data_sgl=%u
>> prot_sgl=%u" \
>>   		  " prot_op=%s driver_tag=%d scheduler_tag=%d
>> cmnd=(%s %s raw=%s)" \
>> -		  " rtn=%d",
>> +		  " rtn=%s",
>>   		  __entry->host_no, __entry->channel, __entry->id,
>>   		  __entry->lun, __entry->data_sglen, __entry-
>>> prot_sglen,
>>   		  show_prot_op_name(__entry->prot_op), __entry-
>>> driver_tag,
>>   		  __entry->scheduler_tag, show_opcode_name(__entry-
>>> opcode),
>>   		  __parse_cdb(__get_dynamic_array(cmnd), __entry-
>>> cmd_len),
>>   		  __print_hex(__get_dynamic_array(cmnd), __entry-
>>> cmd_len),
>> -		  __entry->rtn)
>> +		  __print_symbolic(rtn, { SCSI_MLQUEUE_HOST_BUSY,
>> "HOST_BUSY" },
>> +			  { SCSI_MLQUEUE_DEVICE_BUSY, "DEVICE_BUSY"
>> },
>> +			  { SCSI_MLQUEUE_EH_RETRY, "EH_RETRY" },
>> +			  { SCSI_MLQUEUE_TARGET_BUSY, "TARGET_BUSY"
>> })
>> +		  )
> 
> We tend to do global print_symbolics as show_XXX_name definitions at
> the top of the file even if they only occur once, just in case some
> other trace point wants to use them.

Ok, will follow this suggest in V3.

diff --git a/include/trace/events/scsi.h b/include/trace/events/scsi.h
index 8e2d9b1b0e77..cee057910cb3 100644
--- a/include/trace/events/scsi.h
+++ b/include/trace/events/scsi.h
@@ -199,6 +199,12 @@ TRACE_EVENT(scsi_dispatch_cmd_start,
                   __print_hex(__get_dynamic_array(cmnd), __entry->cmd_len))
  );

+#define show_rtn_type(rtn)    \
+       __print_symbolic(rtn, { SCSI_MLQUEUE_HOST_BUSY, "HOST_BUSY" }, \
+         { SCSI_MLQUEUE_DEVICE_BUSY, "DEVICE_BUSY" }, \
+         { SCSI_MLQUEUE_EH_RETRY, "EH_RETRY" }, \
+         { SCSI_MLQUEUE_TARGET_BUSY, "TARGET_BUSY" })
+
  TRACE_EVENT(scsi_dispatch_cmd_error,

         TP_PROTO(struct scsi_cmnd *cmd, int rtn),
@@ -239,14 +245,15 @@ TRACE_EVENT(scsi_dispatch_cmd_error,

         TP_printk("host_no=%u channel=%u id=%u lun=%u data_sgl=%u 
prot_sgl=%u" \
                   " prot_op=%s driver_tag=%d scheduler_tag=%d cmnd=(%s 
%s raw=%s)" \
-                 " rtn=%d",
+                 " rtn=%s",
                   __entry->host_no, __entry->channel, __entry->id,
                   __entry->lun, __entry->data_sglen, __entry->prot_sglen,
                   show_prot_op_name(__entry->prot_op), __entry->driver_tag,
                   __entry->scheduler_tag, 
show_opcode_name(__entry->opcode),
                   __parse_cdb(__get_dynamic_array(cmnd), __entry->cmd_len),
                   __print_hex(__get_dynamic_array(cmnd), __entry->cmd_len),
-                 __entry->rtn)
+                 show_rtn_type(__entry->rtn)
+         )
  );

> 
> Regards,
> 
> James
>