netdev - RE: [iproute2-next v3] devlink: display elapsed time during flash update

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Date:   Mon, 19 Oct 2020 19:05:34 +0000
From:   "Keller, Jacob E" <jacob.e.keller@...el.com>
To:     David Ahern <dsahern@...il.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Jiri Pirko <jiri@...nulli.us>, Jakub Kicinski <kuba@...nel.org>
CC:     Shannon Nelson <snelson@...sando.io>
Subject: RE: [iproute2-next v3] devlink: display elapsed time during flash
 update

> -----Original Message-----
> From: David Ahern <dsahern@...il.com>
> Sent: Saturday, October 17, 2020 8:35 AM
> To: Keller, Jacob E <jacob.e.keller@...el.com>; netdev@...r.kernel.org; Jiri Pirko
> <jiri@...nulli.us>
> Cc: Shannon Nelson <snelson@...sando.io>
> Subject: Re: [iproute2-next v3] devlink: display elapsed time during flash update
> 
> On 10/14/20 4:31 PM, Jacob Keller wrote:
> > For some devices, updating the flash can take significant time during
> > operations where no status can meaningfully be reported. This can be
> > somewhat confusing to a user who sees devlink appear to hang on the
> > terminal waiting for the device to update.
> >
> > Recent changes to the kernel interface allow such long running commands
> > to provide a timeout value indicating some upper bound on how long the
> > relevant action could take.
> >
> > Provide a ticking counter of the time elapsed since the previous status
> > message in order to make it clear that the program is not simply stuck.
> >
> > Display this message whenever the status message from the kernel
> > indicates a timeout value. Additionally also display the message if
> > we've received no status for more than couple of seconds. If we elapse
> > more than the timeout provided by the status message, replace the
> > timeout display with "timeout reached".
> >
> > Signed-off-by: Jacob Keller <jacob.e.keller@...el.com>
> > ---
> > Changes since v2
> > * use clock_gettime on CLOCK_MONOTONIC instead of gettimeofday
> > * remove use of timersub since we're now using struct timespec
> >
> >  devlink/devlink.c | 105 +++++++++++++++++++++++++++++++++++++++++++++-
> >  1 file changed, 104 insertions(+), 1 deletion(-)
> >
> 
> applied to iproute2-next.
> 
> The DEVLINK attributes are ridiculously long --
> DEVLINK_ATTR_FLASH_UPDATE_STATUS_TIMEOUT is 40 characters -- which
> forces really long code lines or oddly wrapped lines. Going forward
> please consider abbreviations on name components to reduce their lengths.

This is probably a larger discussion, since basically every devlink attribute name is long.

Jiri, Jakub, any thoughts on this? I'd like to see whatever abbreviation scheme we use be consistent.

Thanks,
Jake