linux-kernel - Re: [PATCH v3 12/16] switchtec

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Message-ID: <20170731202700.GE9303@bhelgaas-glaptop.roam.corp.google.com>
Date:   Mon, 31 Jul 2017 15:27:00 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Logan Gunthorpe <logang@...tatee.com>
Cc:     linux-ntb@...glegroups.com, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org, Jon Mason <jdmason@...zu.us>,
        Dave Jiang <dave.jiang@...el.com>,
        Allen Hubbe <Allen.Hubbe@....com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Kurt Schwemmer <kurt.schwemmer@...rosemi.com>,
        Stephen Bates <sbates@...thlin.com>,
        Serge Semin <fancer.lancer@...il.com>
Subject: Re: [PATCH v3 12/16] switchtec_ntb: add link management

On Tue, Jul 25, 2017 at 02:57:49PM -0600, Logan Gunthorpe wrote:
> switchtec_ntb checks for a link by looking at the shared memory
> window. If the magic number is correct and the otherside indicates
> their link is enabled then we take the link to be up.
> 
> Whenever we change our local link status we send a msg to the
> otherside to check whether it's up and change their status.

s/otherside/other side/ (twice)

> The current status is maintained in a flag so ntb_is_link_up
> can return quickly.
> 
> We utilize Switchtec's link status notifier to also check link changes
> when the switch notices a port changes state.