Re: TCP event tracking via netlink...

[Stephen Hemminger <shemminger@linux-foundation.org>]

On Thu, 6 Dec 2007 00:15:49 +0200 (EET)
"Ilpo Järvinen" <ilpo.jarvinen@helsinki.fi> wrote:

> On Wed, 5 Dec 2007, Stephen Hemminger wrote:
> 
> > On Wed, 05 Dec 2007 08:53:07 -0800
> > Joe Perches <joe@perches.com> wrote:
> > 
> > > > it occurred to me that we might want to do something
> > > > like a state change event generator.
> > > 
> > > This could be a basis for an interesting TCP
> > > performance tester.
> > 
> > That is what tcpprobe does but it isn't detailed enough to address SACK
> > issues.
> 
> ...It would be nice if that could be generalized so that the probe could 
> be attached to some other functions than tcp_rcv_established instead.
> 
> If we convert remaining functions that don't have sk or tp as first 
> argument so that sk is listed first (should be many with wrong ordering 
> if any), then maybe a generic handler could be of type:
> 
> jtcp_entry(struct sock *sk, ...)
> 
> or when available:
> 
> jtcp_entry(struct sock *sk, struct sk_buff *ack, ...)
> 
> 
> -- 
>  i.

An earlier version had hooks in send as well, it is trivial to extend. as long as
the prototypes match, any function arg ordering is okay.