linux-kernel - Re: [PATCH]pktgen oops when used with balance-tlb bonding

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Date:	Mon, 7 Aug 2006 15:07:06 -0400
From:	"Tien ChenLi" <cltien@...il.com>
To:	"Willy Tarreau" <w@....eu>
Cc:	linux-kernel@...r.kernel.org, "David Miller" <davem@...emloft.net>
Subject: Re: [PATCH]pktgen oops when used with balance-tlb bonding

Hi,

I forgot that if I also need to patch the fill_packet_ipv6 since I
don't have experience with it. I guess we should patch that one too.

Chen-Li Tien

On 07/08/06, Tien ChenLi <cltien@...il.com> wrote:
> Indeed the skb->mac.raw is already set just several lines up. Now only
> two lines are needed:
>
> Signed-off-by: Chen-Li Tien <cltien@...il.com>
>
> --- linux-2.6.17.6/net/core/pktgen.c.orig       2006-07-15
> 15:00:43.000000000 -0400
> +++ linux-2.6.17.6/net/core/pktgen.c    2006-08-07 14:50:09.000000000 -0400
> @@ -2149,6 +2149,8 @@ static struct sk_buff *fill_packet_ipv4(
>         skb->mac.raw = ((u8 *) iph) - 14 - pkt_dev->nr_labels*sizeof(u32);
>         skb->dev = odev;
>         skb->pkt_type = PACKET_HOST;
> +       skb->nh.iph = iph;
> +       skb->h.uh = udph;
>
>         if (pkt_dev->nfrags <= 0)
>                 pgh = (struct pktgen_hdr *)skb_put(skb, datalen);
>
> Since google mail extand tab into spaces and I cannot change them back
> to tab, I attached the patch file itself so please use it instead.
>
> Sincerely,
> Chen-Li Tien
>
> On 02/08/06, Willy Tarreau <w@....eu> wrote:
> > On Sat, Jul 22, 2006 at 07:11:21PM -0400, Tien ChenLi wrote:
> > > I fixed a bug in pktgen so it won't cause oops when used with
> > > balance-tlb or balance-alb bonding driver:
> > >
> > > --- linux-2.6.17.4/net/core/pktgen.c.orig       2006-07-06
> > > 16:02:28.000000000 -0
> > > 400
> > > +++ linux-2.6.17.4/net/core/pktgen.c    2006-07-10 16:40:47.000000000 -0400
> > > @@ -2149,6 +2149,9 @@
> > >        skb->mac.raw = ((u8 *) iph) - 14 - pkt_dev->nr_labels*sizeof(u32);
> > >        skb->dev = odev;
> > >        skb->pkt_type = PACKET_HOST;
> > > +       skb->mac.raw = eth;
> >           ^^^^^^^^^^^^
> > Are you sure about this ? I don't understand why you change skb->mac.raw
> > here while it's still assigned 3 lines above. Either of those is unneeded
> > and/or erroneous.
> >
> > > +       skb->nh.iph = iph;
> > > +       skb->h.uh = udph;
> > >
> > >        if (pkt_dev->nfrags <= 0)
> > >                pgh = (struct pktgen_hdr *)skb_put(skb, datalen);
> > >
> > > The root cause is that the bond_alb_xmit in bonding will peek the
> > > destination address in packet via the skb->nh.iph pointer, generally
> > > this will be filled by upper layer network driver, but the packet
> > > generated by pktgen will be sent to device driver so it will need to
> > > set this pointer correctly. The other two pointers are not necessary
> > > for now, they are set to avoid similar problem.
> >
> > Fine. Please confirm your intention about mac.raw above, and as David
> > said, please sign-off the patch and check your mailer for unexpected
> > tabs/spaces conversions.
> >
> > > Chen-Li Tien
> >
> > Thanks in advance,
> > Willy
> >
> >
>
>
>
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