megaraid driver always fails to reset adapter

megaraid driver always fails to reset adapter

[Jun'ichi Nomura]

Hello,

I found that the megaraid driver always fails to reset the
adapter with the following message:
    megaraid: resetting the host...
    megaraid mbox: reset sequence completed successfully
    megaraid: fast sync command timed out
    megaraid: reservation reset failed
when the "Cluster mode" of the adapter BIOS is enabled.
So, whenever the reset occurs, the adapter goes to
offline and just become unavailable.

Is this a known problem?

I tried 2.6.9 and 2.6.11-rc5 and the results were the same.
I used sg_reset to invoke reset artificially to test this.

The problem doesn't occur if I disabled the "Cluster mode"
parameter in the adapter BIOS.

I'm not sure how well the currenet megaraid driver supports
the "Cluster mode".
I appreciate if you have any idea.

Thanks,
Jun'ichi Nomura

RE: megaraid driver always fails to reset adapter

[Bagalkote, Sreenivas]

Please try:

In mbox_post_sync_cmd_fast(...) replace

for (i = 0; i < 0xFFFFF; i++) {
	if (mbox->numstatus != 0xFF) break;
}

with

for (i = 0; i < 0xFFFFF; i++) {
	if (mbox->numstatus != 0xFF) break;
	rmb();
} 

Additionally, increase the loop counter to a bigger value.

Thanks,
Sreenivas
LSI LOGIC Corporation 

>-----Original Message-----
>From: Jun'ichi Nomura [mailto:jnomura@mtc.biglobe.ne.jp] 
>Sent: Tuesday, March 01, 2005 1:36 PM
>To: linux-scsi@vger.kernel.org
>Subject: megaraid driver always fails to reset adapter
>
>Hello,
>
>I found that the megaraid driver always fails to reset the
>adapter with the following message:
>    megaraid: resetting the host...
>    megaraid mbox: reset sequence completed successfully
>    megaraid: fast sync command timed out
>    megaraid: reservation reset failed
>when the "Cluster mode" of the adapter BIOS is enabled.
>So, whenever the reset occurs, the adapter goes to
>offline and just become unavailable.
>
>Is this a known problem?
>
>I tried 2.6.9 and 2.6.11-rc5 and the results were the same.
>I used sg_reset to invoke reset artificially to test this.
>
>The problem doesn't occur if I disabled the "Cluster mode"
>parameter in the adapter BIOS.
>
>I'm not sure how well the currenet megaraid driver supports
>the "Cluster mode".
>I appreciate if you have any idea.
>
>Thanks,
>Jun'ichi Nomura
>
>-
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>

Re: megaraid driver always fails to reset adapter

[Jun'ichi Nomura]

Hi,
thanks for the info.

Adding one more 'F' to the loop counter works.
i.e. 0xFFFFFF.

Just adding rmb() didn't solve the problem though it
may decrease the necessary counter value.

I don't know this value is ok for environments other than mine.

Bagalkote, Sreenivas wrote:
> Please try:
> 
> In mbox_post_sync_cmd_fast(...) replace
> 
> for (i = 0; i < 0xFFFFF; i++) {
> 	if (mbox->numstatus != 0xFF) break;
> }
> 
> with
> 
> for (i = 0; i < 0xFFFFF; i++) {
> 	if (mbox->numstatus != 0xFF) break;
> 	rmb();
> } 
> 
> Additionally, increase the loop counter to a bigger value.
> 
> Thanks,
> Sreenivas
> LSI LOGIC Corporation 
> 
> 
>>-----Original Message-----
>>From: Jun'ichi Nomura [mailto:jnomura@mtc.biglobe.ne.jp] 
>>Sent: Tuesday, March 01, 2005 1:36 PM
>>To: linux-scsi@vger.kernel.org
>>Subject: megaraid driver always fails to reset adapter
>>
>>Hello,
>>
>>I found that the megaraid driver always fails to reset the
>>adapter with the following message:
>>   megaraid: resetting the host...
>>   megaraid mbox: reset sequence completed successfully
>>   megaraid: fast sync command timed out
>>   megaraid: reservation reset failed
>>when the "Cluster mode" of the adapter BIOS is enabled.
>>So, whenever the reset occurs, the adapter goes to
>>offline and just become unavailable.
>>
>>Is this a known problem?
>>
>>I tried 2.6.9 and 2.6.11-rc5 and the results were the same.
>>I used sg_reset to invoke reset artificially to test this.
>>
>>The problem doesn't occur if I disabled the "Cluster mode"
>>parameter in the adapter BIOS.
>>
>>I'm not sure how well the currenet megaraid driver supports
>>the "Cluster mode".
>>I appreciate if you have any idea.
>>
>>Thanks,
>>Jun'ichi Nomura

RE: megaraid driver always fails to reset adapter

[Bagalkote, Sreenivas]

Great! Can you give us details about your environment? 
If it makes sense, we will increase the loop counter in the driver.

Thanks,
Sreenivas
LSI LOGIC Corporation

>-----Original Message-----
>From: Jun'ichi Nomura [mailto:jnomura@mtc.biglobe.ne.jp] 
>Sent: Tuesday, March 01, 2005 3:50 PM
>To: Bagalkote, Sreenivas
>Cc: linux-scsi@vger.kernel.org
>Subject: Re: megaraid driver always fails to reset adapter
>
>Hi,
>thanks for the info.
>
>Adding one more 'F' to the loop counter works.
>i.e. 0xFFFFFF.
>
>Just adding rmb() didn't solve the problem though it
>may decrease the necessary counter value.
>
>I don't know this value is ok for environments other than mine.
>
>Bagalkote, Sreenivas wrote:
>> Please try:
>> 
>> In mbox_post_sync_cmd_fast(...) replace
>> 
>> for (i = 0; i < 0xFFFFF; i++) {
>> 	if (mbox->numstatus != 0xFF) break;
>> }
>> 
>> with
>> 
>> for (i = 0; i < 0xFFFFF; i++) {
>> 	if (mbox->numstatus != 0xFF) break;
>> 	rmb();
>> } 
>> 
>> Additionally, increase the loop counter to a bigger value.
>> 
>> Thanks,
>> Sreenivas
>> LSI LOGIC Corporation 
>> 
>> 
>>>-----Original Message-----
>>>From: Jun'ichi Nomura [mailto:jnomura@mtc.biglobe.ne.jp] 
>>>Sent: Tuesday, March 01, 2005 1:36 PM
>>>To: linux-scsi@vger.kernel.org
>>>Subject: megaraid driver always fails to reset adapter
>>>
>>>Hello,
>>>
>>>I found that the megaraid driver always fails to reset the
>>>adapter with the following message:
>>>   megaraid: resetting the host...
>>>   megaraid mbox: reset sequence completed successfully
>>>   megaraid: fast sync command timed out
>>>   megaraid: reservation reset failed
>>>when the "Cluster mode" of the adapter BIOS is enabled.
>>>So, whenever the reset occurs, the adapter goes to
>>>offline and just become unavailable.
>>>
>>>Is this a known problem?
>>>
>>>I tried 2.6.9 and 2.6.11-rc5 and the results were the same.
>>>I used sg_reset to invoke reset artificially to test this.
>>>
>>>The problem doesn't occur if I disabled the "Cluster mode"
>>>parameter in the adapter BIOS.
>>>
>>>I'm not sure how well the currenet megaraid driver supports
>>>the "Cluster mode".
>>>I appreciate if you have any idea.
>>>
>>>Thanks,
>>>Jun'ichi Nomura
>