netdev - [PATCH net 0/8] Fixes for Ocelot driver statistics

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Date:   Tue, 16 Aug 2022 16:53:44 +0300
From:   Vladimir Oltean <vladimir.oltean@....com>
To:     netdev@...r.kernel.org
Cc:     Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Claudiu Manoil <claudiu.manoil@....com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        UNGLinuxDriver@...rochip.com,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Colin Foster <colin.foster@...advantage.com>,
        Maxim Kochetkov <fido_max@...ox.ru>
Subject: [PATCH net 0/8] Fixes for Ocelot driver statistics

This series contains bug fixes for the ocelot drivers (both switchdev
and DSA). Some concern the counters exposed to ethtool -S, and others to
the counters exposed to ifconfig. I'm aware that the changes are fairly
large, but I wanted to prioritize on a proper approach to addressing the
issues rather than a quick hack.

Some of the noticed problems:
- bad register offsets for some counters
- unhandled concurrency leading to corrupted counters
- unhandled 32-bit wraparound of ifconfig counters

The issues on the ocelot switchdev driver were noticed through code
inspection, I do not have the hardware to test.

This patch set necessarily converts ocelot->stats_lock from a mutex to a
spinlock. I know this affects Colin Foster's development with the SPI
controlled VSC7512. I have other changes prepared for net-next that
convert this back into a mutex (along with other changes in this area).

Vladimir Oltean (8):
  net: dsa: felix: fix ethtool 256-511 and 512-1023 TX packet counters
  net: mscc: ocelot: fix incorrect ndo_get_stats64 packet counters
  net: mscc: ocelot: fix address of SYS_COUNT_TX_AGING counter
  net: mscc: ocelot: turn stats_lock into a spinlock
  net: mscc: ocelot: fix race between ndo_get_stats64 and
    ocelot_check_stats_work
  net: mscc: ocelot: make struct ocelot_stat_layout array indexable
  net: mscc: ocelot: keep ocelot_stat_layout by reg address, not offset
  net: mscc: ocelot: report ndo_get_stats64 from the
    wraparound-resistant ocelot->stats

 drivers/net/dsa/ocelot/felix_vsc9959.c     | 558 +++++++++++++++++----
 drivers/net/dsa/ocelot/seville_vsc9953.c   | 553 ++++++++++++++++----
 drivers/net/ethernet/mscc/ocelot.c         |  62 ++-
 drivers/net/ethernet/mscc/ocelot_net.c     |  55 +-
 drivers/net/ethernet/mscc/ocelot_vsc7514.c | 468 +++++++++++++----
 drivers/net/ethernet/mscc/vsc7514_regs.c   |  84 +++-
 include/soc/mscc/ocelot.h                  | 179 ++++++-
 7 files changed, 1581 insertions(+), 378 deletions(-)

-- 
2.34.1