linux-kernel - RE: [PATCH 6/8] ntb_tool: Add link status file to debugfs

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Date:	Tue, 14 Jun 2016 11:54:16 -0400
From:	"Allen Hubbe" <Allen.Hubbe@....com>
To:	"'Logan Gunthorpe'" <logang@...tatee.com>,
	"'Allen Hubbe'" <allenbh@...il.com>
Cc:	"'Jon Mason'" <jdmason@...zu.us>,
	"'Dave Jiang'" <dave.jiang@...el.com>,
	"'Shuah Khan'" <shuahkh@....samsung.com>,
	"'Sudip Mukherjee'" <sudipm.mukherjee@...il.com>,
	"'Arnd Bergmann'" <arnd@...db.de>, <linux-kernel@...r.kernel.org>,
	<linux-ntb@...glegroups.com>, <linux-kselftest@...r.kernel.org>
Subject: RE: [PATCH 6/8] ntb_tool: Add link status file to debugfs

From: Logan Gunthorpe
> On 14/06/16 09:45 AM, Allen Hubbe wrote:
> >
> > Feel free to disregard my suggestion above.  I hope my comment has not cost you too much
> time.
> >
> > The way you have written it already, and used it in the self-test script is much more
> concise.
> >
> >>> + * root@...f# echo > $DBG_DIR/link
> >
> > Acked-by: Allen.Hubbe@....com
> >
> >
> >
> > Eventually, I think it would be useful to let ntb_tool enable and disable the link.  In
> that case, it might also be useful in a test script to wait for link down, not just link
> up.
> >
> > What about this:
> >
> > # Wait for the link to be up or down
> > root@...f# echo 1 > $DBG_DIR/link
> > root@...f# echo 0 > $DBG_DIR/link
> >
> > It need not be a part of this patch, but eventually:
> >
> > # Enable or disable the link
> > root@...f# echo 1 > $DBG_DIR/link_ctrl
> > root@...f# echo 0 > $DBG_DIR/link_ctrl
> >
> > # Reading the link_ctrl file can also give the link status
> > root@...f# cat $DBG_DIR/link_ctrl
> >
> > Finally, I wonder if the file called "link" in this patch should be called "link_wait"
> or similar, so its purpose is obviously not for enabling and disabling the link.
> >
> 
> Actually I've already implemented something similar to your original
> suggestion. I'll be submitting a v2 of this set shortly.

Ok.  Thanks.  I'll accept the blame if anyone doesn't like it.