netdev - Re: [PATCH v2 00/17] octeontx2-af: NPC parser and NIX blocks initialization

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Date:   Fri, 26 Oct 2018 18:59:32 +0530
From:   Sunil Kovvuri <sunil.kovvuri@...il.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Linux Netdev List <netdev@...r.kernel.org>,
        linux-soc@...r.kernel.org, Sunil Goutham <sgoutham@...vell.com>
Subject: Re: [PATCH v2 00/17] octeontx2-af: NPC parser and NIX blocks initialization

On Fri, Oct 26, 2018 at 6:24 PM Arnd Bergmann <arnd@...db.de> wrote:
>
> On 10/23/18, David Miller <davem@...emloft.net> wrote:
> > From: sunil.kovvuri@...il.com
> > Date: Mon, 22 Oct 2018 23:25:47 +0530
> >
> >> From: Sunil Goutham <sgoutham@...vell.com>
> >>
> >> This patchset is a continuation to earlier submitted two patch
> >> series to add a new driver for Marvell's OcteonTX2 SOC's
> >> Resource virtualization unit (RVU) admin function driver.
> >>
> >> 1. octeontx2-af: Add RVU Admin Function driver
> >>    https://www.spinics.net/lists/netdev/msg528272.html
> >> 2. octeontx2-af: NPA and NIX blocks initialization
> >>    https://www.spinics.net/lists/netdev/msg529163.html
> >>
> >> This patch series adds more NIX block configuration logic
> >> and additionally adds NPC block parser profile configuration.
> >> In brief below is what this series adds.
> >> NIX block:
> >> - Support for PF/VF to allocate/free transmit scheduler queues,
> >>   maintenance and their configuration.
> >> - Adds support for packet replication lists, only broadcast
> >>   packets is covered for now.
> >> - Defines few RSS flow algorithms for HW to distribute packets.
> >>   This is not the hash algorithsm (i.e toeplitz or crc32), here SW
> >>   defines what fields in packet should HW take and calculate the hash.
> >> - Support for PF/VF to configure VTAG strip and capture capabilities.
> >> - Reset NIXLF statastics.
> >>
> >> NPC block:
> >> This block has multiple parser engines which support packet parsing
> >> at multiple layers and generates a parse result which is further used
> >> to generate a key. Based on packet field offsets in the key, SW can
> >> install packet forwarding rules.
> >> This patch series adds
> >> - Initial parser profile to be programmed into parser engines.
> >> - Default forwarding rules to forward packets to different logical
> >>   interfaces having a NIXLF attached.
> >> - Support for promiscuous and multicast modes.
> >>
> >> Changes from v1:
> >>  1 Fixed kernel build failure when compiled with BIG_ENDIAN enabled.
> >>    - Reported by Kbuild test robot
> >>  2 Fixed a warning observed when kernel is built with
> >> -Wunused-but-set-variable
> >
> > Series applied.
>
> I see this has been applied, but I'd still like to understand better how the
> configuration interface is expected to work once the driver is complete.
>
> In particular, so far the interfaces all assume that configuration is
> done through the mailbox between PCI devices, which could be done
> from a virtual machine kernel with access to PCI, or through the use
> of VFIO from a user application.
>
> Is that the only method of configuring it that you support, or will there
> also be a devlink based interface or something like that to configure
> the aspects of a virtual device that should not be accessible to the
> VF itself?
>
>         Arnd


As of now it's only mbox based configuration that is supported.

Thanks,
Sunil.