netdev - Re: [RFC] net/core: Delay neighbor only if it has been used after confirmed

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Date:	Thu, 10 Sep 2009 18:21:47 +0200
From:	Jens Rosenboom <me@...r.de>
To:	YOSHIFUJI Hideaki <yoshfuji@...ux-ipv6.org>
Cc:	Linux Network Developers <netdev@...r.kernel.org>
Subject: Re: [RFC] net/core: Delay neighbor only if it has been used after
 confirmed

On Wed, 2009-09-02 at 21:22 +0900, YOSHIFUJI Hideaki wrote:
[...]
> And, this "if" for REACHABLE->DELAY may be completely needless.
> Timer in REACHABLE is only for state transition for toward REACHABLE
> or STALE.

I did some testing with the following patch, which works fine for me, so
I propose this one now instead of my previous one. I still have no real
idea about the non-IPv6 implications of this, though.

---

diff --git a/net/core/neighbour.c b/net/core/neighbour.c
index e587e68..f61926f 100644
--- a/net/core/neighbour.c
+++ b/net/core/neighbour.c
@@ -819,13 +819,6 @@ static void neigh_timer_handler(unsigned long arg)
 				   neigh->confirmed + neigh->parms->reachable_time)) {
 			NEIGH_PRINTK2("neigh %p is still alive.\n", neigh);
 			next = neigh->confirmed + neigh->parms->reachable_time;
-		} else if (time_before_eq(now,
-					  neigh->used + neigh->parms->delay_probe_time)) {
-			NEIGH_PRINTK2("neigh %p is delayed.\n", neigh);
-			neigh->nud_state = NUD_DELAY;
-			neigh->updated = jiffies;
-			neigh_suspect(neigh);
-			next = now + neigh->parms->delay_probe_time;
 		} else {
 			NEIGH_PRINTK2("neigh %p is suspected.\n", neigh);
 			neigh->nud_state = NUD_STALE;


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