netdev - Re: [PATCH iproute2 3/5] rdma: Add device capability parsing

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Message-ID: <20170627151603.509af242@xeon-e3>
Date:   Tue, 27 Jun 2017 15:16:03 -0700
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     Leon Romanovsky <leon@...nel.org>
Cc:     Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
        Doug Ledford <dledford@...hat.com>,
        Ariel Almog <ariela@...lanox.com>,
        Dennis Dalessandro <dennis.dalessandro@...el.com>,
        Linux RDMA <linux-rdma@...r.kernel.org>,
        Linux Netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH iproute2 3/5] rdma: Add device capability parsing

On Tue, 27 Jun 2017 20:33:01 +0300
Leon Romanovsky <leon@...nel.org> wrote:

> On Tue, Jun 27, 2017 at 10:41:50AM -0600, Jason Gunthorpe wrote:
> > On Tue, Jun 27, 2017 at 12:21:29PM +0300, Leon Romanovsky wrote:  
> > > > What will be the output of such command?
> > > >  $ rdma dev show mlx5_4  
> > >
> > > ip-like style:
> > >
> > > $ rdma dev show mlx5_4
> > > 5: mlx5_4:
> > >     caps: <BAD_PKEY_CNTR, BAD_QKEY_CNTR, CHANGE_PHY_PORT, PORT_ACTIVE_EVENT, SYS_IMAGE_GUID, RC_RNR_NAK_GEN, MEM_WINDOW, UD_IP_CSUM, UD_TSO, XRC, MEM_MGT_EXTENSIONS, BLOCK_MULTICAST_LOOPBACK, MEM_WINDOW_TYPE_2B, RAW_IP_CSUM, SIGNATURE_HANDOVER, VIRTUAL_FUNCTION>
> > > $ rdma link show mlx5_3
> > > 4/1: mlx5_3/1:
> > >     caps: <CM, IP_BASED_GIDS>  
> >
> > I think that is better, maybe it should only show under some kind of
> > verbose mode, I don't know, it depends what other stuff ends up being
> > displayed..
> >
> > Are you going to dump the gid table and pkey table too in one of these commands?  
> 
> My initial plan was to put all parsers under their respective names, in
> the similar way as I did for caps: $ rdma dev show mlx5_4 caps
> 
> So for large dumps, I'm going to use that technique again and maybe print summary as a default.
> For example, for gids, we can print utilization as a summary while whole
> table if someone really wants it: $ rdma link show mlx5_4/1 gids <index>
> 
> Something like that.
> 
> Thanks
> 
> >
> > Jason  

Agree with discussion so far.

For iproute2 style commands, the show and set commands need to have similar arguments.
Ideally, everything after the colon in the show would be parameters to set command.

Please consider having a concise form for normal users and a detail form (with -d) for 
configuration and setup cases. The caps should not need to be displayed in normal show
output.

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