netdev - RE: [PATCH net-next v3 00/11] implement DEVLINK_CMD_REGION

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Message-ID: <02874ECE860811409154E81DA85FBB58B6CF569F@FMSMSX102.amr.corp.intel.com>
Date:   Tue, 28 Apr 2020 02:03:21 +0000
From:   "Keller, Jacob E" <jacob.e.keller@...el.com>
To:     Jakub Kicinski <kuba@...nel.org>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Jiri Pirko <jiri@...nulli.us>
Subject: RE: [PATCH net-next v3 00/11] implement DEVLINK_CMD_REGION_NEW

> -----Original Message-----
> From: netdev-owner@...r.kernel.org <netdev-owner@...r.kernel.org> On
> Behalf Of Jakub Kicinski
> Sent: Monday, April 27, 2020 5:27 PM
> To: Keller, Jacob E <jacob.e.keller@...el.com>
> Cc: netdev@...r.kernel.org; Jiri Pirko <jiri@...nulli.us>
> Subject: Re: [PATCH net-next v3 00/11] implement
> DEVLINK_CMD_REGION_NEW
> 
> On Thu, 26 Mar 2020 11:37:07 -0700 Jacob Keller wrote:
> > This series adds support for the DEVLINK_CMD_REGION_NEW operation, used
> to
> > enable userspace requesting a snapshot of a region on demand.
> >
> > This can be useful to enable adding regions for a driver for which there is
> > no trigger to create snapshots. By making this a core part of devlink, there
> > is no need for the drivers to use a separate channel such as debugfs.
> >
> > The primary intent for this kind of region is to expose device information
> > that might be useful for diagnostics and information gathering.
> >
> > The first few patches refactor regions to support a new ops structure for
> > extending the available operations that regions can perform. This includes
> > converting the destructor into an op from a function argument.
> >
> > Next, patches refactor the snapshot id allocation to use an xarray which
> > tracks the number of current snapshots using a given id. This is done so
> > that id lifetime can be determined, and ids can be released when no longer
> > in use.
> >
> > Without this change, snapshot ids remain used forever, until the snapshot_id
> > count rolled over UINT_MAX.
> >
> > Finally, code to enable the previously unused DEVLINK_CMD_REGION_NEW is
> > added. This code enforces that the snapshot id is always provided, unlike
> > previous revisions of this series.
> >
> > Finally, a patch is added to enable using this new command via the .snapshot
> > callback in both netdevsim and the ice driver.
> >
> > For the ice driver, a new "nvm-flash" region is added, which will enable
> > read access to the NVM flash contents. The intention for this is to allow
> > diagnostics tools to gather information about the device. By using a
> > snapshot and gathering the NVM contents all at once, the contents can be
> > atomic.
> 
> Hi Jake,
> 
> does iproute2 needs some patches to make this work?
> 
> ./devlink region new netdevsim/netdevsim1/dummy snapshot_id 1
> Command "new" not found

Ahh, yes I think it does. I seem to have forgotten to send these, will do so now.

Thanks,
Jake