netdev - Re: [PATCH v2] ethtool: igb: dump RR2DCDELAY register

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Message-ID: <20190726152632.GB23037@tuxdriver.com>
Date:   Fri, 26 Jul 2019 11:26:32 -0400
From:   "John W. Linville" <linville@...driver.com>
To:     Artem Bityutskiy <dedekind1@...il.com>
Cc:     netdev@...r.kernel.org
Subject: Re: [PATCH v2] ethtool: igb: dump RR2DCDELAY register

On Mon, Jul 15, 2019 at 01:59:33PM +0300, Artem Bityutskiy wrote:
> From: Artem Bityutskiy <artem.bityutskiy@...ux.intel.com>
> 
> Decode 'RR2DCDELAY' register which Linux kernel provides starting from version
> 5.3. The corresponding commit in the Linux kernel is:
>     cd502a7f7c9c igb: add RR2DCDELAY to ethtool registers dump
> 
> The RR2DCDELAY register is present in I210 and I211 Intel Gigabit Ethernet
> chips and it stands for "Read Request To Data Completion Delay". Here is how
> this register is described in the I210 datasheet:
> 
> "This field captures the maximum PCIe split time in 16 ns units, which is the
> maximum delay between the read request to the first data completion. This is
> giving an estimation of the PCIe round trip time."
> 
> In practice, this register can be used to measure the time it takes the NIC to
> read data from the host memory.
> 
> Signed-off-by: Artem Bityutskiy <artem.bityutskiy@...ux.intel.com>

Queued for next release -- thanks!

John

-- 
John W. Linville		Someday the world will need a hero, and you
linville@...driver.com			might be all we have.  Be ready.