linux-kernel - Re: [RFC net-next v5 0/9] net: bridge: mrp: Add support for Media Redundancy Protocol(MRP)

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Message-ID: <20200418150359.no4qcgc7oxqunkjp@soft-dev3.microsemi.net>
Date:   Sat, 18 Apr 2020 17:03:59 +0200
From:   Horatiu Vultur <horatiu.vultur@...rochip.com>
To:     Nikolay Aleksandrov <nikolay@...ulusnetworks.com>
CC:     <davem@...emloft.net>, <jiri@...nulli.us>, <ivecera@...hat.com>,
        <kuba@...nel.org>, <roopa@...ulusnetworks.com>,
        <olteanv@...il.com>, <andrew@...n.ch>,
        <linux-kernel@...r.kernel.org>, <netdev@...r.kernel.org>,
        <bridge@...ts.linux-foundation.org>, <UNGLinuxDriver@...rochip.com>
Subject: Re: [RFC net-next v5 0/9] net: bridge: mrp: Add support for Media
 Redundancy Protocol(MRP)

The 04/18/2020 12:01, Nikolay Aleksandrov wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
> 
> On 14/04/2020 14:26, Horatiu Vultur wrote:
> > Media Redundancy Protocol is a data network protocol standardized by
> > International Electrotechnical Commission as IEC 62439-2. It allows rings of
> > Ethernet switches to overcome any single failure with recovery time faster than
> > STP. It is primarily used in Industrial Ethernet applications.
> >
> > Based on the previous RFC[1][2][3][4], the MRP state machine and all the timers
> > were moved to userspace, except for the timers used to generate MRP Test frames.
> > In this way the userspace doesn't know and should not know if the HW or the
> > kernel will generate the MRP Test frames. The following changes were added to
> > the bridge to support the MRP:
> > - the existing netlink interface was extended with MRP support,
> > - allow to detect when a MRP frame was received on a MRP ring port
> > - allow MRP instance to forward/terminate MRP frames
> > - generate MRP Test frames in case the HW doesn't have support for this
> >
> > To be able to offload MRP support to HW, the switchdev API  was extend.
> >
> 
> Hi Horatiu,
> The set still has a few blocker issues (bisectability, sysfs error return, use of extack)
> and a few other cleanup tasks as I've noted in my replies to the respective patches.
> I think with those out of the way you can submit it for inclusion.

Hi Nik,

Thanks for the review. I really need to be more careful with the
bisectability. I will update the code based on your comments and then
send the patch series again.

> 
> Cheers,
>  Nik
> 
> 
> 
> 

-- 
/Horatiu