linux-kernel - Re: [PATCH 00/15] soc: octeontx2: Add RVU admin function driver

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Date:   Fri, 31 Aug 2018 00:01:11 +0530
From:   Sunil Kovvuri <sunil.kovvuri@...il.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Arnd Bergmann <arnd@...db.de>, LKML <linux-kernel@...r.kernel.org>,
        olof@...om.net, LAKML <linux-arm-kernel@...ts.infradead.org>,
        linux-soc@...r.kernel.org, Sunil Goutham <sgoutham@...vell.com>,
        Linux Netdev List <netdev@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH 00/15] soc: octeontx2: Add RVU admin function driver

On Thu, Aug 30, 2018 at 6:57 PM Andrew Lunn <andrew@...n.ch> wrote:
>
> > > > My feeling overall is that we need a review from the network driver
> > > > folks more than the arm-soc team etc, and that maybe the driver
> > > > as a whole should go into drivers/net/ethernet.
> > >
> > > This driver doesn't handle any network IO and moreever this driver has to handle
> > > configuration requests from crypto driver as well. There will be
> > > separate network and
> > > crypto drivers which will be upstreamed into drivers/net/ethernet and
> > > drivers/crypto.
> > > And in future silicons there will be different types of functional
> > > blocks which will be
> > > added into this resource virtualization unit (RVU). Hence i thought
> > > this driver is not a
> > > right fit in drivers/net/ethernet.
>
> Hi Sunil
>
> Do you have a git branch for everything? I would like to look at the
> actual Ethernet driver, and the full API this driver exports to other
> drivers.

Hi Andrew,

I have pushed all patches into a github repo for your reference.
These are not the final patches, i still need to do some minor changes
before submitting
(i mean otherthan the ones i already submitted).

AF driver & CGX drivers:
https://github.com/sunilkovvuri/rvu_drivers/tree/master/drivers/soc/marvell/octeontx2

Ethernet drivers PF and VF
https://github.com/sunilkovvuri/rvu_drivers/tree/master/drivers/net/ethernet/marvell/octeontx2

Info exported/shared by AF driver with other drivers is
# Mailbox communication APIs, message IDs, message structs e.t.c
   https://github.com/sunilkovvuri/rvu_drivers/blob/master/drivers/soc/marvell/octeontx2/mbox.c
   https://github.com/sunilkovvuri/rvu_drivers/blob/master/drivers/soc/marvell/octeontx2/mbox.h
# Other structs and APIs
    https://github.com/sunilkovvuri/rvu_drivers/blob/master/drivers/soc/marvell/octeontx2/common.h
    https://github.com/sunilkovvuri/rvu_drivers/blob/master/drivers/soc/marvell/octeontx2/rvu_struct.h

>
> I think there real question here is, do you have split between this
> driver and the actual device drivers in the right place? For me, link
> up/down detection should be in the Ethernet driver, since it is not
> shared with the crypto driver.
>

As mentioned in the patch '[PATCH 13/15] soc: octeontx2: Add support
for CGX link management',
link up/down is detected by firmware. And firmware triggers a IRQ to
CGX driver, which then
takes the new status and sends a update to ethernet driver via a
mailbox communication.

Ethernet driver detects the link change and does the necessary stuff.
https://github.com/sunilkovvuri/rvu_drivers/blob/master/drivers/net/ethernet/marvell/octeontx2/otx2_pf.c#L116


>        Thanks
>         Andrew