netdev - Re: [net-next PATCH 06/10] octeontx2-af: Add NIX1 interfaces to NPC

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Date:   Sat, 17 Oct 2020 10:22:26 +0530
From:   sundeep subbaraya <sundeep.lkml@...il.com>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
        rsaladi2@...vell.com, Sunil Kovvuri Goutham <sgoutham@...vell.com>,
        Subbaraya Sundeep <sbhatta@...vell.com>
Subject: Re: [net-next PATCH 06/10] octeontx2-af: Add NIX1 interfaces to NPC

Hi Jakub,

On Fri, Oct 16, 2020 at 11:18 PM Jakub Kicinski <kuba@...nel.org> wrote:
>
> On Fri, 16 Oct 2020 08:59:43 +0530 sundeep subbaraya wrote:
> > On Thu, Oct 15, 2020 at 9:02 PM Jakub Kicinski <kuba@...nel.org> wrote:
> > > On Thu, 15 Oct 2020 17:53:07 +0530 sundeep subbaraya wrote:
> > > > Hi Jakub,
> > > >
> > > > On Thu, Oct 15, 2020 at 8:18 AM Jakub Kicinski <kuba@...nel.org> wrote:
> > > > >
> > > > > On Tue, 13 Oct 2020 15:56:28 +0530 sundeep.lkml@...il.com wrote:
> > > > > > -static const struct npc_mcam_kex npc_mkex_default = {
> > > > > > +static struct npc_mcam_kex npc_mkex_default = {
> > > > > >       .mkex_sign = MKEX_SIGN,
> > > > > >       .name = "default",
> > > > > >       .kpu_version = NPC_KPU_PROFILE_VER,
> > > > >
> > > > > Why is this no longer constant? Are you modifying global data based
> > > > > on the HW discovered in the system?
> > > >
> > > > Yes. Due to an errata present on earlier silicons
> > > > npc_mkex_default.keyx_cfg[NIX_INTF_TX]
> > > > and npc_mkex_default.keyx_cfg[NIX_INTF_RX] needs to be identical.
> > >
> > > Does this run on the SoC? Is there no possibility that the same kernel
> > > will have to drive two different pieces of hardware?
> >
> > If kernel runs on SoC with errata present then
> > npc_mkex_default.keyx_cfg[NIX_INTF_TX]
> > is modified to be same as npc_mkex_default.keyx_cfg[NIX_INTF_RX]. And if errata
> > is not applicable to SoC then npc_mkex_default.keyx_cfg[NIX_INTF_TX]
> > is unchanged and the values present in TX and RX are programmed to TX and RX
> > interface registers.
>
> Let me rephrase the question - can the AF driver only run on the SoC
> or are there configurations in which host can control the AF?
>
> I see that Kconfig depends on ARM64 but is that what you choose
> to support or a HW limitation?

AF driver only run on SoC and SoC is ARM64 based. Host cannot control the AF.
Depends on ARM64 is HW limitation.

Thanks,
Sundeep