netdev - Re: [PATCH net-next 2/5] ibmvnic: Include documentation for ibmvnic sysfs files

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Date:   Mon, 31 Aug 2020 12:07:32 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Thomas Falcon <tlfalcon@...ux.ibm.com>
Cc:     netdev@...r.kernel.org, drt@...ux.vnet.ibm.com,
        sukadev@...ux.vnet.ibm.com, ljp@...ux.vnet.ibm.com,
        cforno12@...ux.ibm.com
Subject: Re: [PATCH net-next 2/5] ibmvnic: Include documentation for ibmvnic
 sysfs files

On Mon, 31 Aug 2020 11:58:10 -0500 Thomas Falcon wrote:
> Include documentation for existing ibmvnic sysfs files,
> currently only for "failover," which is used to swap
> the active hardware port to a backup port in redundant
> backing hardware or failover configurations.
> 
> Signed-off-by: Thomas Falcon <tlfalcon@...ux.ibm.com>
> ---
>  Documentation/ABI/testing/sysfs-driver-ibmvnic | 14 ++++++++++++++
>  1 file changed, 14 insertions(+)
>  create mode 100644 Documentation/ABI/testing/sysfs-driver-ibmvnic
> 
> diff --git a/Documentation/ABI/testing/sysfs-driver-ibmvnic b/Documentation/ABI/testing/sysfs-driver-ibmvnic
> new file mode 100644
> index 0000000..7fa2920
> --- /dev/null
> +++ b/Documentation/ABI/testing/sysfs-driver-ibmvnic
> @@ -0,0 +1,14 @@
> +What:		/sys/devices/vio/<our device>/failover
> +Date:		June 2017
> +KernelVersion:	4.13
> +Contact:	linuxppc-dev@...ts.ozlabs.org
> +Description:	If the ibmvnic device has been configured with redundant
> +		physical NIC ports, the user may write "1" to the failover
> +		file to trigger a device failover, which will reset the
> +		ibmvnic device and swap to a backup physical port. If no
> +		redundant physical port has been configured for the device,
> +		the device will not reset and -EINVAL is returned. If anything
> +		other than "1" is written to the file, -EINVAL will also be
> +		returned.
> +Users:		Any users of the ibmvnic driver which use redundant hardware
> +		configurations.

Could you elaborate what the failover thing is? Is it what net_failover
does or something opposite? (you say "backup physical port" which
sounds like physical port is a backup.. perhaps some IBM nomenclature
there worth clarifying?)