Date:	Tue, 11 Feb 2014 18:22:25 +0000
From:	Gustavo Pimentel <gustavo.pimentel@...cec.com>
To:	Jay Vosburgh <fubar@...ibm.com>
CC:	Veaceslav Falico <vfalico@...hat.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: RE: Bonding

Hi Jay,

I was not aware of that. You are correct, both HSR and PRP are defined on IEC 62439-3. I will try to contact the person in charge of HSR, to acquire more information about his driver status.


> -----Original Message-----
> From: Jay Vosburgh [mailto:fubar@...ibm.com]
> Sent: terça-feira, 11 de Fevereiro de 2014 17:56
> To: Gustavo Pimentel
> Cc: Veaceslav Falico; netdev@...r.kernel.org
> Subject: Re: Bonding
> 
> Gustavo Pimentel <gustavo.pimentel@...cec.com> wrote:
> 
> >Hi Veaceslav,
> >
> >It's quite different from broadcast mode, each frame sent through the slaves has
> attached a Redundancy Control Trailer also known as RCT (this trailer is compose
> by a LAN identifier, sequence number, a LSDU size and a PRP suffix).
> >Also the equipment with PRP capability has to send periodically a supervision
> frame to both similar LANs. Each device on the network has to keep track of
> receive sequence numbers received, if the received a sequence number for
> instance from LAN A of specific device and it doesn't exist on internal table, the
> device should accept the frame and update the internal table. When receiving the
> same sequence number from the LAN B, the device should discard it, providing
> zero downtime redundancy.
> >
> >I can supply you information about this redundancy protocol, if you like. This
> type of network redundancy is now being large deployed on electrical power
> stations (like thermal and hydro) and transmission power stations instead of
> teaming / bonding that depends on RSTP for redundancy.
> 
> 	Are you aware that there is already an implementation of HSR (High-
> availability Seamless Redundancy) in the linux kernel?  I believe HSR and PRP are
> defined by the same standard (IEC 62439-3), and are similar enough to interoperate
> to some degree.  Perhaps PRP would be better implemented as a variant within the
> existing net/hsr/ framework.
> 
> 	-J
> 
> 
> >> -----Original Message-----
> >> From: Veaceslav Falico [mailto:vfalico@...hat.com]
> >> Sent: terça-feira, 11 de Fevereiro de 2014 14:16
> >> To: Gustavo Pimentel
> >> Cc: netdev@...r.kernel.org
> >> Subject: Re: Bonding
> >>
> >> On Tue, Feb 11, 2014 at 01:53:32PM +0000, Gustavo Pimentel wrote:
> >> >Hi,
> >>
> >> Hi Gustavo,
> >>
> >> >
> >> >I'm writing you because because I'm have implemented a new mode (PRP
> >> >Parallel
> >> Redundancy Protocol) for bonding kernel driver. This new mode is
> >> quite simple, I don't know if you have heard about PRP, but it's a
> >> new standard that allows to overcome any single network failure
> >> without affecting the data transmission. The general idea resides on
> >> having two separate LAN (A & B) very similar and transmitting the
> >> almost the same frame through both LANs and the end device should accept
> one frame and discard the other according to a known mechanism.
> >>
> >> Isn't that the current 'broadcast' mode, where every packet is
> >> transmitted over all the slaves? After quick googling/reading I don't
> >> see any difference there, though I might have missed something.
> >>
> >> >
> >> >I have implemented this new mode on bonding driver, but I have some
> >> difficulties:
> >> >. Writing linux driver is quite new for me. I don't' know if exists
> >> >guide lines for
> >> driver coding.
> >>
> >> You can find everything under Documentation/, but without the code I
> >> can't tell you exact documents. CodingStyle and SubmittingPatches might be
> the first ones.
> >>
> >> Also, try CC-ing relevant people for more feedback, specifically
> >> bonding maintainers.
> >>
> >> >. I don't know how to submit the code to be include on kernel repository.
> >> >. Maybe another pair of eyes could find help to improve the writing
> >> >code for this
> >> mode.
> >>
> >> Try sending an RFC when net-next opens.
> >>
> >> >
> >> >I think my driver code is 99% complete. I'm currently testing with 3
> >> >equipments (1
> >> pc + 1 embedded device running both my modify bonding driver) and a
> >> third party equipment called RedBox.
> >> >
> >> >Would you be interested in participating / helping this project?
> >> >
> >> >With my best regards,
> >> >
> >> >Gustavo Gama da Rocha Pimentel
> >> >Power Systems Automation / Innovation & Development Efacec
> >> >Engenharia e Sistemas, S.A.
> >> >Phone: +351229403391
> >> >Disclaimer
> 
> ---
> 	-Jay Vosburgh, IBM Linux Technology Center, fubar@...ibm.com
> 

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