linux-kernel - Re: [net-next v4 PATCH 1/7] hsr: enhance netlink socket interface to support PRP

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Date:   Wed, 22 Jul 2020 09:01:15 -0400
From:   Murali Karicheri <m-karicheri2@...com>
To:     Randy Dunlap <rdunlap@...radead.org>, <davem@...emloft.net>,
        <kuba@...nel.org>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-api@...r.kernel.org>,
        <nsekhar@...com>, <grygorii.strashko@...com>,
        <vinicius.gomes@...el.com>
Subject: Re: [net-next v4 PATCH 1/7] hsr: enhance netlink socket interface to
 support PRP

Hi Randy

On 7/20/20 2:37 PM, Randy Dunlap wrote:
> On 7/20/20 9:57 AM, Murali Karicheri wrote:
>> diff --git a/net/hsr/Kconfig b/net/hsr/Kconfig
>> index 8095b034e76e..e2e396870230 100644
>> --- a/net/hsr/Kconfig
>> +++ b/net/hsr/Kconfig
>> @@ -4,24 +4,35 @@
>>   #
>>   
>>   config HSR
>> -	tristate "High-availability Seamless Redundancy (HSR)"
>> -	help
>> +	tristate "High-availability Seamless Redundancy (HSR & PRP)"
>> +	---help---
> 
> Just use:
> 	help
> 
> The use of "---help---" has been discontinued.
> 
Ok. Will update.
>> +	  This enables IEC 62439 defined High-availability Seamless
>> +	  Redundancy (HSR) and Parallel Redundancy Protocol (PRP).
>> +
>>   	  If you say Y here, then your Linux box will be able to act as a
>> -	  DANH ("Doubly attached node implementing HSR"). For this to work,
>> -	  your Linux box needs (at least) two physical Ethernet interfaces,
>> -	  and it must be connected as a node in a ring network together with
>> -	  other HSR capable nodes.
>> +	  DANH ("Doubly attached node implementing HSR") or DANP ("Doubly
>> +	  attached node implementing PRP"). For this to work, your Linux box
>> +	  needs (at least) two physical Ethernet interfaces.
>> +
>> +	  For DANH, it must be connected as a node in a ring network together
>> +	  with other HSR capable nodes. All Ethernet frames sent over the hsr
> 
> 	                                                                  HSR
> 
>> +	  device will be sent in both directions on the ring (over both slave
>> +	  ports), giving a redundant, instant fail-over network. Each HSR node
>> +	  in the ring acts like a bridge for HSR frames, but filters frames
>> +	  that have been forwarded earlier.
>>   
>> -	  All Ethernet frames sent over the hsr device will be sent in both
>> -	  directions on the ring (over both slave ports), giving a redundant,
>> -	  instant fail-over network. Each HSR node in the ring acts like a
>> -	  bridge for HSR frames, but filters frames that have been forwarded
>> -	  earlier.
>> +	  For DANP, it must be connected as a node connecting to two
>> +	  separate networks over the two slave interfaces. Like HSR, Ethernet
>> +	  frames sent over the prp device will be sent to both networks giving
> 
> 	                       PRP
> 
>> +	  a redundant, instant fail-over network. Unlike HSR, PRP networks
>> +	  can have Singly Attached Nodes (SAN) such as PC, printer, bridges
>> +	  etc and will be able to communicate with DANP nodes.
>>   
>>   	  This code is a "best effort" to comply with the HSR standard as
>>   	  described in IEC 62439-3:2010 (HSRv0) and IEC 62439-3:2012 (HSRv1),
>> -	  but no compliancy tests have been made. Use iproute2 to select
>> -	  the version you desire.
>> +	  and PRP standard described in IEC 62439-4:2012 (PRP), but no
>> +	  compliancy tests have been made. Use iproute2 to select the protocol
>> +	  you would like to use.
>>   
>>   	  You need to perform any and all necessary tests yourself before
>>   	  relying on this code in a safety critical system!
> 
> thanks.
> 

-- 
Murali Karicheri
Texas Instruments