netdev - Re: [PATCH v5 3/3] NFSD: convert write

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Date: Thu, 30 Nov 2023 11:22:47 -0500
From: Jeff Layton <jlayton@...nel.org>
To: Lorenzo Bianconi <lorenzo@...nel.org>
Cc: linux-nfs@...r.kernel.org, lorenzo.bianconi@...hat.com, neilb@...e.de, 
	netdev@...r.kernel.org, kuba@...nel.org
Subject: Re: [PATCH v5 3/3] NFSD: convert write_ports to netlink command

On Thu, 2023-11-30 at 10:57 +0100, Lorenzo Bianconi wrote:
> > > 
> > > +/* ============== NFSD_CMD_LISTENER_START ============== */
> > > +/* NFSD_CMD_LISTENER_START - do */
> > > +struct nfsd_listener_start_req {
> > > +	struct {
> > > +		__u32 transport_name_len;
> > > +		__u32 port:1;
> > > +	} _present;
> > > +
> > > +	char *transport_name;
> > > +	__u32 port;
> > > +};
> > 
> > How do you deconfigure a listener with this interface? i.e. suppose I
> > want to stop nfsd from listening on a particular port? I think this too
> > is a place where a declarative interface would be better:
> 
> Is it possible with current APIs? as for 2/3 so far I have just added netlink
> counter for current implementation but I am fine to change the logic here to
> better APIs.
> 
> > 

No, I don't think you can do this with the current API at all. I
consider it a major deficiency. I don't think we want to repeat that
mistake in the new interface.

> > Have userland send down a list of the ports that we should currently be
> > listening on, and let the kernel do the work to match the request. Again
> > too, an empty list could mean "close everything".
> > 
> > 

-- 
Jeff Layton <jlayton@...nel.org>