netdev - Re: [patch net-next v3 3/3] devlink: implement flash status monitoring

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Date:   Mon, 10 Jun 2019 10:24:38 -0700
From:   Jakub Kicinski <jakub.kicinski@...ronome.com>
To:     David Ahern <dsahern@...il.com>
Cc:     Jiri Pirko <jiri@...nulli.us>, netdev@...r.kernel.org,
        davem@...emloft.net, mlxsw@...lanox.com, sthemmin@...rosoft.com,
        saeedm@...lanox.com, leon@...nel.org, f.fainelli@...il.com
Subject: Re: [patch net-next v3 3/3] devlink: implement flash status
 monitoring

On Mon, 10 Jun 2019 11:09:19 -0600, David Ahern wrote:
> On 6/4/19 7:44 AM, Jiri Pirko wrote:
> > diff --git a/man/man8/devlink-dev.8 b/man/man8/devlink-dev.8
> > index 1804463b2321..1021ee8d064c 100644
> > --- a/man/man8/devlink-dev.8
> > +++ b/man/man8/devlink-dev.8
> > @@ -244,6 +244,17 @@ Sets the parameter internal_error_reset of specified devlink device to true.
> >  devlink dev reload pci/0000:01:00.0
> >  .RS 4
> >  Performs hot reload of specified devlink device.
> > +.RE
> > +.PP
> > +devlink dev flash pci/0000:01:00.0 file firmware.bin
> > +.RS 4
> > +Flashes the specified devlink device with provided firmware file name. If the driver supports it, user gets updates about the flash status. For example:
> > +.br
> > +Preparing to flash
> > +.br
> > +Flashing 100%
> > +.br
> > +Flashing done
> >  
> >  .SH SEE ALSO
> >  .BR devlink (8),  
> 
> something is missing here from a user perspective at least:
> 
> root@...-2700-05:~# ./devlink dev
> pci/0000:03:00.0
> 
> root@...-2700-05:~# ./devlink dev flash pci/0000:03:00.0 file
> /lib/firmware/mellanox/mlxsw_spectrum-13.2000.1122.mfa2
> devlink answers: No such file or directory
> 
> root@...-2700-05:~# ls -l
> /lib/firmware/mellanox/mlxsw_spectrum-13.2000.1122.mfa2
> -rw-r--r-- 1 cumulus 1001 994184 May 14 22:44
> /lib/firmware/mellanox/mlxsw_spectrum-13.2000.1122.mfa2
> 
> 
> Why the 'no such file' response when the file exists?

I think the FW loader prepends /lib/firmware to the path (there is a
CONFIG_ for the search paths, and / is usually not on it).  Perhaps try:

./devlink dev flash pci/0000:03:00.0 file mellanox/mlxsw_spectrum-13.2000.1122.mfa2