linux-kernel - Re: [PATCHv3 1/6] firmware: stratix10-svc: add COMMAND_AUTHENTICATE

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Message-ID: <2f9d082b-9970-8f41-0351-324f1bad6cbf@linux.intel.com>
Date:   Wed, 27 Jan 2021 07:05:41 -0600
From:   Richard Gong <richard.gong@...ux.intel.com>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     mdf@...nel.org, trix@...hat.com, linux-fpga@...r.kernel.org,
        linux-kernel@...r.kernel.org, dinguyen@...nel.org,
        sridhar.rajagopal@...el.com, Richard Gong <richard.gong@...el.com>
Subject: Re: [PATCHv3 1/6] firmware: stratix10-svc: add
 COMMAND_AUTHENTICATE_BITSTREAM flag


Hi Greg,

Thanks for review!

On 1/27/21 6:04 AM, Greg KH wrote:
> On Mon, Jan 25, 2021 at 02:56:23PM -0600, richard.gong@...ux.intel.com wrote:
>> From: Richard Gong <richard.gong@...el.com>
>>
>> Add COMMAND_AUTHENTICATE_BITSTREAM command flag for new added bitstream
>> authentication feature. Authenticating a bitstream is to make sure a signed
>> bitstream has the valid signatures.
>>
>> Except for the actual configuration of the device, the bitstream
>> authentication works the same way as FPGA configuration does. If the
>> authentication passes, the signed bitstream will be programmed into QSPI
>> flash memory and will be expected to boot without issues.
>>
>> Clean up COMMAND_RECONFIG_FLAG_PARTIAL flag by resetting it to 0, which
>> aligns with the firmware settings.
>>
>> Signed-off-by: Richard Gong <richard.gong@...el.com>
>> ---
>> v3: no change
>> v2: new added
>> ---
>>   include/linux/firmware/intel/stratix10-svc-client.h | 11 ++++++++---
>>   1 file changed, 8 insertions(+), 3 deletions(-)
>>
>> diff --git a/include/linux/firmware/intel/stratix10-svc-client.h b/include/linux/firmware/intel/stratix10-svc-client.h
>> index ebc2956..7ada1f2 100644
>> --- a/include/linux/firmware/intel/stratix10-svc-client.h
>> +++ b/include/linux/firmware/intel/stratix10-svc-client.h
>> @@ -51,12 +51,17 @@
>>   #define SVC_STATUS_NO_SUPPORT		6
>>   
>>   /*
>> - * Flag bit for COMMAND_RECONFIG
>> + * Flag for COMMAND_RECONFIG, in bit number
>>    *
>>    * COMMAND_RECONFIG_FLAG_PARTIAL:
>> - * Set to FPGA configuration type (full or partial).
>> + * Set for partial FPGA configuration.
>> + *
>> + * COMMAND_AUTHENTICATE_BITSTREAM:
>> + * Set for bitstream authentication, which makes sure a signed bitstream
>> + * has valid signatures before committing it to QSPI flash memory.
>>    */
>> -#define COMMAND_RECONFIG_FLAG_PARTIAL	1
>> +#define COMMAND_RECONFIG_FLAG_PARTIAL	0
> 
> So is this a bugfix, changing this value to the correct one?

Yes, it is a bug fix.
> 
> If so, shouldn't this be a stand-alone patch and get backported to
> stable kernel releases?

Sure, I will make change and submit again as a standalone patch.

> 
> If not, then no one uses this flag today?
> 
> thanks,
> 
> greg k-h
> 
Regards,
Richard