netdev - Re: [PATCH net-next v13 0/6] net: dsa: qca8k, mv88e6xxx: rmon: Add RMU support

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Date:   Fri, 16 Sep 2022 08:05:28 +0200
From:   Christian Marangi <ansuelsmth@...il.com>
To:     Mattias Forsblad <mattias.forsblad@...il.com>
Cc:     netdev@...r.kernel.org, Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, linux@...linux.org.uk
Subject: Re: [PATCH net-next v13 0/6] net: dsa: qca8k, mv88e6xxx: rmon: Add
 RMU support

On Fri, Sep 16, 2022 at 02:18:11PM +0200, Mattias Forsblad wrote:
> The Marvell SOHO switches have the ability to receive and transmit
> Remote Management Frames (Frame2Reg) to the CPU through the
> attached network interface.
> This is handled by the Remote Management Unit (RMU) in the switch
> These frames can contain different payloads:
> single switch register read and writes, daisy chained switch
> register read and writes, RMON/MIB dump/dump clear and ATU dump.
> The dump functions are very costly over MDIO but it's
> only a couple of network packets via the RMU.
> 
> Next step could be to implement ATU dump.
> We've found that the gain to use RMU for single register
> read and writes is neglible.
> 
> qca8k
> =====
> There's a newly introduced convenience function for sending
> and waiting for frames. Changes have been made for the qca8k
> driver to use this. Please test for regressions.
>

Hi,
I found time to test this aaaand it's broken...
I leaved some comments in the specific patch to make this work on legacy
custom completion implementation.

Ideally I will convert qca8k to the non legacy but I like your approach
of not enforcing stuff.

> RFC -> v1:
>   - Track master interface availability.
>   - Validate destination MAC for incoming frames.
>   - Rate limit outputs.
>   - Cleanup setup function validating upstream port on switch.
>   - Fix return values when setting up RMU.
>   - Prefix defines correctly.
>   - Fix aligned accesses.
>   - Validate that switch exists for incoming frames.
>   - Split RMON stats function.
> 
> v1 -> v2:
>   - Remove unused variable.
> 
> v2 -> v3:
>   - Rewrite after feedback. Use tagger_data to handle
>     frames more like qca8k.
>   - qca8k: Change to use convenience functions introduced.
>     Requesting test of this.
>     
> v3 -> v4:
>   - Separated patches more granular.
> 
> v4 -> v5:
>   - Some small fixes after feedback.
> 
> v5 -> v6:
>   - Rewrite of send_wait function to more adhere
>     to RPC standards
>   - Cleanup of ops handling
>   - Move get id to when master device is available.
> 
> v6 -> v7:
>   - Some minor cleanups.
> 
> v7 -> v8:
>   - Moved defines to header file.
>   - Check RMU response length and return actual
>     length received.
>   - Added disable/enable helpers for RMU.
>   - Fixed some error paths.
> 
> v8 -> v9:
>   - Naming consistency for parameters/functions.
>   - Streamlined completion routines.
>   - Moved completion init earlier.
>   - Spelling corrected.
>   - Moved dsa_tagger_data declaration.
>   - Minimal frame2reg decoding in tag_dsa.
>   - Fixed return codes.
>   - Use convenience functions.
>   - Streamlined function parameters.
>   - Fixed error path when master device changes
>     state.
>   - Still verify MAC address (per request of Andrew Lunn)
>   - Use skb_get instead of skb_copy
>   - Prefix defines and structs correctly.
>   - Change types to __beXX.
> 
> v9 -> v10:
>   - Patchworks feedback fixed.
> 
> v10 -> v11:
>   - Fixed sparse warnings.
> 
> v11 -> v12:
>   - Split mv88e6xxx_stats_get_stats into separate
>     functions, one for RMU and one for legacy
>     access.
> 
> v12 -> v13:
>   - Expose all RMON counters via RMU.
> 
> Regards,
> Mattias Forsblad
> 
> Mattias Forsblad (6):
>   net: dsa: mv88e6xxx: Add RMU enable for select switches.
>   net: dsa: Add convenience functions for frame handling
>   net: dsa: Introduce dsa tagger data operation.
>   net: dsa: mv88e6xxxx: Add RMU functionality.
>   net: dsa: mv88e6xxx: rmon: Use RMU for reading RMON data
>   net: dsa: qca8k: Use new convenience functions
> 
>  drivers/net/dsa/mv88e6xxx/Makefile  |   1 +
>  drivers/net/dsa/mv88e6xxx/chip.c    | 117 +++++++++-
>  drivers/net/dsa/mv88e6xxx/chip.h    |  31 +++
>  drivers/net/dsa/mv88e6xxx/global1.c |  64 ++++++
>  drivers/net/dsa/mv88e6xxx/global1.h |   3 +
>  drivers/net/dsa/mv88e6xxx/rmu.c     | 320 ++++++++++++++++++++++++++++
>  drivers/net/dsa/mv88e6xxx/rmu.h     |  73 +++++++
>  drivers/net/dsa/mv88e6xxx/smi.c     |   3 +
>  drivers/net/dsa/qca/qca8k-8xxx.c    |  61 ++----
>  include/linux/dsa/mv88e6xxx.h       |   6 +
>  include/net/dsa.h                   |  11 +
>  net/dsa/dsa.c                       |  17 ++
>  net/dsa/dsa2.c                      |   2 +
>  net/dsa/dsa_priv.h                  |   2 +
>  net/dsa/tag_dsa.c                   |  40 +++-
>  15 files changed, 692 insertions(+), 59 deletions(-)
>  create mode 100644 drivers/net/dsa/mv88e6xxx/rmu.c
>  create mode 100644 drivers/net/dsa/mv88e6xxx/rmu.h
> 
> -- 
> 2.25.1
> 

-- 
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