netdev - RE: [PATCH net-next 1/2] rtnetlink: Add new RTM_GETEECSTATE message to get SyncE status

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Date:   Fri, 3 Sep 2021 22:20:36 +0000
From:   "Machnikowski, Maciej" <maciej.machnikowski@...el.com>
To:     Stephen Hemminger <stephen@...workplumber.org>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>,
        "richardcochran@...il.com" <richardcochran@...il.com>,
        "abyagowi@...com" <abyagowi@...com>,
        "Nguyen, Anthony L" <anthony.l.nguyen@...el.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "linux-kselftest@...r.kernel.org" <linux-kselftest@...r.kernel.org>
Subject: RE: [PATCH net-next 1/2] rtnetlink: Add new RTM_GETEECSTATE message
 to get SyncE status

> -----Original Message-----
> From: Stephen Hemminger <stephen@...workplumber.org>
> Sent: Friday, September 3, 2021 6:19 PM
> Subject: Re: [PATCH net-next 1/2] rtnetlink: Add new RTM_GETEECSTATE
> message to get SyncE status
> 
> On Fri,  3 Sep 2021 17:14:35 +0200
> Maciej Machnikowski <maciej.machnikowski@...el.com> wrote:
> 
> > This patch series introduces basic interface for reading the Ethernet
> > Equipment Clock (EEC) state on a SyncE capable device. This state gives
> > information about the state of EEC. This interface is required to
> > implement Synchronization Status Messaging on upper layers.
> >
> > Initial implementation returns SyncE EEC state and flags attributes.
> > The only flag currently implemented is the EEC_SRC_PORT. When it's set
> > the EEC is synchronized to the recovered clock recovered from the
> > current port.
> >
> > SyncE EEC state read needs to be implemented as a ndo_get_eec_state
> > function.
> >
> > Signed-off-by: Maciej Machnikowski <maciej.machnikowski@...el.com>
> 
> Is there a simpler way to do this? Seems like you are adding
> a lot for a use case specific to a small class of devices.
> For example adding a new network device operation adds small
> amount of bloat to every other network device in the kernel.

Hi!

I couldn't find any simpler way. Do you have something specific in mind?
A function pointer is only U64. I can hardly think of anything smaller.

Regards
Maciek