netdev - Re: TCP event tracking via netlink...

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Date:	Wed, 5 Dec 2007 21:06:49 -0700
From:	Stephen Hemminger <shemminger@...ux-foundation.org>
To:	"Ilpo Järvinen" <ilpo.jarvinen@...sinki.fi>
Cc:	Joe Perches <joe@...ches.com>, David Miller <davem@...emloft.net>,
	Netdev <netdev@...r.kernel.org>
Subject: Re: TCP event tracking via netlink...

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

> On Wed, 5 Dec 2007, Stephen Hemminger wrote:
> 
> > On Wed, 05 Dec 2007 08:53:07 -0800
> > Joe Perches <joe@...ches.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.
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