netdev - Re: [PATCH net-next] ibmvnic: Client-initiated failover

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Date:   Tue, 13 Jun 2017 13:00:44 -0400 (EDT)
From:   David Miller <davem@...emloft.net>
To:     tlfalcon@...ux.vnet.ibm.com
Cc:     netdev@...r.kernel.org, nfont@...ux.vnet.ibm.com,
        jallen@...ux.vnet.ibm.com
Subject: Re: [PATCH net-next] ibmvnic: Client-initiated failover

From: Thomas Falcon <tlfalcon@...ux.vnet.ibm.com>
Date: Mon, 12 Jun 2017 12:35:04 -0500

> The IBM vNIC protocol provides support for the user to initiate
> a failover from the client LPAR in case the current backing infrastructure
> is deemed inadequate or in an error state.
> 
> Support for two H_VIOCTL sub-commands for vNIC devices are required
> to implement this function. These commands are H_GET_SESSION_TOKEN
> and H_SESSION_ERR_DETECTED.
> 
> "[H_GET_SESSION_TOKEN] is used to obtain a session token from a VNIC client
> adapter.  This token is opaque to the caller and is intended to be used in
> tandem with the SESSION_ERROR_DETECTED vioctl subfunction."
> 
> "[H_SESSION_ERR_DETECTED] is used to report that the currently active
> backing device for a VNIC client adapter is behaving poorly, and that
> the hypervisor should attempt to fail over to a different backing device,
> if one is available."
> 
> To provide tools access to this functionality the vNIC driver creates a
> sysfs file that, when written to, will send a request to pHyp to failover
> to a different backing device.
> 
> Signed-off-by: Thomas Falcon <tlfalcon@...ux.vnet.ibm.com>

Applied.