Re: [mpls-linux-general] Dst_entry in MPLS implementation

[James R. L. <jl...@mi...>]

On Mon, Feb 18, 2002 at 10:17:56AM +0530, jagdish Garg wrote:
> Hi
> I have seen the linux code.  In the code ref_count is use for keeping the
> reference, but not the _use field. In Mpls 1.0 code to delete a
> label(__mpls_del_out_label) and dst_entry, simply release
> st_entry( dst_release(moi->moi_dst) is called.  The function dst_release is
> decrementing the ref_count not the _use field.

Then I'm not sure what _use if for, it obvioulsy doesn't have much of an
impact on mpls-linux.  You have the kernel code figure it out yourself.

> Please let me know how to get the latest CVS code.

http://sourceforge.net/cvs/?group_id=15443

> 
> Regards
> Jagdish
> 
> ----- Original Message -----
> From: James R. Leu <jl...@mi...>
> To: jagdish Garg <jag...@ie...>
> Cc: <mpl...@li...>
> Sent: Friday, February 15, 2002 9:08 PM
> Subject: Re: [mpls-linux-general] Dst_entry in MPLS implementation
> 
> 
> >
> > From: "James R. Leu" <jl...@mi...> on 02/15/2002 09:38 AM CST
> >
> > Please respond to jl...@mi...
> >
> > To:   jagdish Garg <jag...@ie...>
> > cc:   mpl...@li...
> > Subject:  Re: [mpls-linux-general] Dst_entry in MPLS implementation
> >
> >
> > In mpls-linux 1.0 dst_entry is used ineffeciently.  Take a look at
> > mpls-linux 1.1xx (get it from CVS) to see how it will be used in the
> > future.
> >
> > As for you question.  Since MPLS created the dst_entry  and holds a
> > reference
> > (and a reference count) for the dst_entry, it will not be deleted until
> > MPLS releases it.  The neighbor entry the the dst_entry points to can
> > change
> > over time, but the neighbor entry deals with this.
> >
> > _use is the reference count.
> >
> > Jim
> >
> > On Fri, Feb 15, 2002 at 02:53:07PM +0530, jagdish Garg wrote:
> > > Hi
> > > In the mpls code a new dst entry is created for each new nhlfe add
> > request.
> > > The pointer of which is kept in moi. The dst_entry is further use
> depends
> > on
> > > the mpls LSP configuration.  I have one question, suppose dst_entry is
> > not
> > > used long time and it will go to the garbage list. After that if moi is
> > used
> > > then what will happen?
> > >
> > > Further I will be grateful if one can tell me the significance of _use
> > field
> > > of dst_entry structure.
> > >
> > >
> > >
> > > Thanks in advance
> > > Jagdish
> > >
> > >
> > >
> > >
> > > _______________________________________________
> > > mpls-linux-general mailing list
> > > mpl...@li...
> > > https://lists.sourceforge.net/lists/listinfo/mpls-linux-general
> >
> > --
> > James R. Leu
> >

-- 
James R. Leu