linux-kernel - RE: [PATCH] ppp_generic: fix multilink fragment sizes

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Message-ID: <DF7BB929B28FCF479E888E3D9F8D9E88D3E16B5A@irsmsx502.ger.corp.intel.com>
Date:	Wed, 2 Jun 2010 16:17:59 +0100
From:	"Paoloni, Gabriele" <gabriele.paoloni@...el.com>
To:	Ben McKeegan <ben@...servers.co.uk>,
	"davem@...emloft.net" <davem@...emloft.net>
CC:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"alan@...rguk.ukuu.org.uk" <alan@...rguk.ukuu.org.uk>,
	"linux-ppp@...r.kernel.org" <linux-ppp@...r.kernel.org>,
	"paulus@...ba.org" <paulus@...ba.org>
Subject: RE: [PATCH] ppp_generic: fix multilink fragment sizes

The proposed patch looks wrong to me.

nbigger is already doing the job; I didn't use DIV_ROUND_UP because in general we don't have always to roundup, otherwise we would exceed the total bandwidth.

Regards

Gabriele Paoloni

-----Original Message-----
From: Ben McKeegan [mailto:ben@...servers.co.uk] 
Sent: 02 June 2010 16:05
To: davem@...emloft.net
Cc: ben@...servers.co.uk; netdev@...r.kernel.org; linux-kernel@...r.kernel.org; Paoloni, Gabriele; alan@...rguk.ukuu.org.uk; linux-ppp@...r.kernel.org; paulus@...ba.org
Subject: [PATCH] ppp_generic: fix multilink fragment sizes

Fix bug in multilink fragment size calculation introduced by
commit 9c705260feea6ae329bc6b6d5f6d2ef0227eda0a
"ppp: ppp_mp_explode() redesign"

Signed-off-by: Ben McKeegan <ben@...servers.co.uk>
---
 drivers/net/ppp_generic.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/drivers/net/ppp_generic.c b/drivers/net/ppp_generic.c
index 0db3894..8b36bfe 100644
--- a/drivers/net/ppp_generic.c
+++ b/drivers/net/ppp_generic.c
@@ -1416,7 +1416,8 @@ static int ppp_mp_explode(struct ppp *ppp, struct sk_buff *skb)
 		flen = len;
 		if (nfree > 0) {
 			if (pch->speed == 0) {
-				flen = totlen/nfree;
+				if (nfree > 1)
+					flen = DIV_ROUND_UP(len, nfree);
 				if (nbigger > 0) {
 					flen++;
 					nbigger--;
-- 
1.5.6.5

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