linux-kernel - [PATCH v5 net-next 0/3] use bulk reads for ocelot statistics

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Date:   Mon,  7 Feb 2022 20:46:41 -0800
From:   Colin Foster <colin.foster@...advantage.com>
To:     linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Cc:     Jakub Kicinski <kuba@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        UNGLinuxDriver@...rochip.com,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Claudiu Manoil <claudiu.manoil@....com>,
        Vladimir Oltean <vladimir.oltean@....com>
Subject: [PATCH v5 net-next 0/3] use bulk reads for ocelot statistics

Ocelot loops over memory regions to gather stats on different ports.
These regions are mostly continuous, and are ordered. This patch set
uses that information to break the stats reads into regions that can get
read in bulk.

The motiviation is for general cleanup, but also for SPI. Performing two
back-to-back reads on a SPI bus require toggling the CS line, holding,
re-toggling the CS line, sending 3 address bytes, sending N padding
bytes, then actually performing the read. Bulk reads could reduce almost
all of that overhead, but require that the reads are performed via
regmap_bulk_read.

v1 > v2: reword commit messages
v2 > v3: correctly mark this for net-next when sending
v3 > v4: calloc array instead of zalloc per review
v4 > v5:
    Apply CR suggestions for whitespace
    Fix calloc / zalloc mixup
    Properly destroy workqueues
    Add third commit to split long macros

Colin Foster (3):
  net: ocelot: align macros for consistency
  net: mscc: ocelot: add ability to perform bulk reads
  net: mscc: ocelot: use bulk reads for stats

 drivers/net/ethernet/mscc/ocelot.c    | 78 ++++++++++++++++++++++-----
 drivers/net/ethernet/mscc/ocelot_io.c | 13 +++++
 include/soc/mscc/ocelot.h             | 57 ++++++++++++++------
 3 files changed, 120 insertions(+), 28 deletions(-)

-- 
2.25.1