linux-kernel - Re: [PATCH v4 net-next 0/2] use bulk reads for ocelot statistics

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Message-ID: <20220131115621.50296adf@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com>
Date:   Mon, 31 Jan 2022 11:56:21 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Colin Foster <colin.foster@...advantage.com>
Cc:     linux-kernel@...r.kernel.org, netdev@...r.kernel.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: Re: [PATCH v4 net-next 0/2] use bulk reads for ocelot statistics

On Fri, 28 Jan 2022 12:05:47 -0800 Colin Foster wrote:
> 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.

This got into Changes Requested state in patchwork, I'm not sure why.

I revived it and will apply it by the end of the day PST if nobody
raises comments.