* Fw: [Bugme-new] [Bug 6495] New: Vlan MTU Fragmentation
@ 2006-05-05 6:56 Andrew Morton
2006-05-05 15:57 ` Ben Greear
0 siblings, 1 reply; 6+ messages in thread
From: Andrew Morton @ 2006-05-05 6:56 UTC (permalink / raw)
To: netdev; +Cc: bugme-daemon@kernel-bugs.osdl.org
Begin forwarded message:
Date: Thu, 4 May 2006 23:15:56 -0700
From: bugme-daemon@bugzilla.kernel.org
To: bugme-new@lists.osdl.org
Subject: [Bugme-new] [Bug 6495] New: Vlan MTU Fragmentation
http://bugzilla.kernel.org/show_bug.cgi?id=6495
Summary: Vlan MTU Fragmentation
Kernel Version: 2.6.16.12
Status: NEW
Severity: normal
Owner: shemminger@osdl.org
Submitter: slavon@bigtelecom.ru
Steps to reproduce:
ifconfing eth0 mtu 1500
ifconfing eth0.100 mtu 1500
ping www.ru -s 2000
-- BAD --
----------------
ifconfing eth0 mtu 1500
ifconfing eth0.100 mtu 1496
ping www.ru -s 2000
--NORMAL--
------- You are receiving this mail because: -------
You are on the CC list for the bug, or are watching someone who is.
^ permalink raw reply [flat|nested] 6+ messages in thread* Re: Fw: [Bugme-new] [Bug 6495] New: Vlan MTU Fragmentation
2006-05-05 6:56 Fw: [Bugme-new] [Bug 6495] New: Vlan MTU Fragmentation Andrew Morton
@ 2006-05-05 15:57 ` Ben Greear
2006-05-06 2:39 ` Andrew Morton
0 siblings, 1 reply; 6+ messages in thread
From: Ben Greear @ 2006-05-05 15:57 UTC (permalink / raw)
To: Andrew Morton; +Cc: netdev, bugme-daemon@kernel-bugs.osdl.org
Andrew Morton wrote:
>
> Begin forwarded message:
>
> Date: Thu, 4 May 2006 23:15:56 -0700
> From: bugme-daemon@bugzilla.kernel.org
> To: bugme-new@lists.osdl.org
> Subject: [Bugme-new] [Bug 6495] New: Vlan MTU Fragmentation
>
>
> http://bugzilla.kernel.org/show_bug.cgi?id=6495
>
> Summary: Vlan MTU Fragmentation
> Kernel Version: 2.6.16.12
> Status: NEW
> Severity: normal
> Owner: shemminger@osdl.org
> Submitter: slavon@bigtelecom.ru
>
>
> Steps to reproduce:
>
> ifconfing eth0 mtu 1500
> ifconfing eth0.100 mtu 1500
>
> ping www.ru -s 2000
> -- BAD --
>
> ----------------
>
> ifconfing eth0 mtu 1500
> ifconfing eth0.100 mtu 1496
>
> ping www.ru -s 2000
> --NORMAL--
This is almost definately a bug in the ethernet driver. The driver needs
to be modified so that it can send/receive pkts that are MTU + 4 bytes for the
VLAN header.
We need to know what NIC/driver this user is using...
Ben
>
> ------- You are receiving this mail because: -------
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> More majordomo info at http://vger.kernel.org/majordomo-info.html
>
--
Ben Greear <greearb@candelatech.com>
Candela Technologies Inc http://www.candelatech.com
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Fw: [Bugme-new] [Bug 6495] New: Vlan MTU Fragmentation
2006-05-05 15:57 ` Ben Greear
@ 2006-05-06 2:39 ` Andrew Morton
2006-05-06 4:39 ` Ben Greear
0 siblings, 1 reply; 6+ messages in thread
From: Andrew Morton @ 2006-05-06 2:39 UTC (permalink / raw)
To: Ben Greear; +Cc: netdev, bugme-daemon, slavon
On Fri, 05 May 2006 08:57:06 -0700
Ben Greear <greearb@candelatech.com> wrote:
> Andrew Morton wrote:
> >
> > Begin forwarded message:
> >
> > Date: Thu, 4 May 2006 23:15:56 -0700
> > From: bugme-daemon@bugzilla.kernel.org
> > To: bugme-new@lists.osdl.org
> > Subject: [Bugme-new] [Bug 6495] New: Vlan MTU Fragmentation
> >
> >
> > http://bugzilla.kernel.org/show_bug.cgi?id=6495
> >
> > Summary: Vlan MTU Fragmentation
> > Kernel Version: 2.6.16.12
> > Status: NEW
> > Severity: normal
> > Owner: shemminger@osdl.org
> > Submitter: slavon@bigtelecom.ru
> >
> >
> > Steps to reproduce:
> >
> > ifconfing eth0 mtu 1500
> > ifconfing eth0.100 mtu 1500
> >
> > ping www.ru -s 2000
> > -- BAD --
> >
> > ----------------
> >
> > ifconfing eth0 mtu 1500
> > ifconfing eth0.100 mtu 1496
> >
> > ping www.ru -s 2000
> > --NORMAL--
>
> This is almost definately a bug in the ethernet driver. The driver needs
> to be modified so that it can send/receive pkts that are MTU + 4 bytes for the
> VLAN header.
>
> We need to know what NIC/driver this user is using...
>
> Ben
>
Sorry, I should have added Badalian to Cc:. He's using 3c905C (3c59x.c,
allegedly maintained by myself).
(Badalian, please use emailed reply-to-all rather than the bugzilla
interface for the remainder of this discussion, thanks).
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Fw: [Bugme-new] [Bug 6495] New: Vlan MTU Fragmentation
2006-05-06 2:39 ` Andrew Morton
@ 2006-05-06 4:39 ` Ben Greear
2006-05-06 6:17 ` Andrew Morton
0 siblings, 1 reply; 6+ messages in thread
From: Ben Greear @ 2006-05-06 4:39 UTC (permalink / raw)
To: Andrew Morton; +Cc: netdev, bugme-daemon, slavon
Andrew Morton wrote:
> Sorry, I should have added Badalian to Cc:. He's using 3c905C (3c59x.c,
> allegedly maintained by myself).
>
> (Badalian, please use emailed reply-to-all rather than the bugzilla
> interface for the remainder of this discussion, thanks).
>
There is an ancient patch on this page:
http://www.bewley.net/linux/vlan/patches/
I have no idea if this would apply or if it has already been put into the
kernel. I also don't have any 3com nics to test with, but there are probably
folks on the vlan mailing list that could try patches...
Thanks,
Ben
--
Ben Greear <greearb@candelatech.com>
Candela Technologies Inc http://www.candelatech.com
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Fw: [Bugme-new] [Bug 6495] New: Vlan MTU Fragmentation
2006-05-06 4:39 ` Ben Greear
@ 2006-05-06 6:17 ` Andrew Morton
2006-05-06 17:20 ` Ben Greear
0 siblings, 1 reply; 6+ messages in thread
From: Andrew Morton @ 2006-05-06 6:17 UTC (permalink / raw)
To: Ben Greear; +Cc: netdev, bugme-daemon, slavon
On Fri, 05 May 2006 21:39:14 -0700
Ben Greear <greearb@candelatech.com> wrote:
> Andrew Morton wrote:
>
> > Sorry, I should have added Badalian to Cc:. He's using 3c905C (3c59x.c,
> > allegedly maintained by myself).
> >
> > (Badalian, please use emailed reply-to-all rather than the bugzilla
> > interface for the remainder of this discussion, thanks).
> >
>
> There is an ancient patch on this page:
>
> http://www.bewley.net/linux/vlan/patches/
>
> I have no idea if this would apply or if it has already been put into the
> kernel. I also don't have any 3com nics to test with, but there are probably
> folks on the vlan mailing list that could try patches...
>
Yeah, that was merged ages ago.
I guess I can type simple commands and add printks. Do you have time to
take a look at the driver and suggest what I should be looking for?
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Fw: [Bugme-new] [Bug 6495] New: Vlan MTU Fragmentation
2006-05-06 6:17 ` Andrew Morton
@ 2006-05-06 17:20 ` Ben Greear
0 siblings, 0 replies; 6+ messages in thread
From: Ben Greear @ 2006-05-06 17:20 UTC (permalink / raw)
To: Andrew Morton; +Cc: netdev, bugme-daemon, slavon
Andrew Morton wrote:
> I guess I can type simple commands and add printks. Do you have time to
> take a look at the driver and suggest what I should be looking for?
I can only offer vague hints:
TX usually works, but RX often has isues. There is usually a bit
or two that needs setting to enable the larger than MTU pkt RX.
It seems some older chipsets had issues with doing checksum offload
for VLAN packets, so could try disabling the UDP/TCP checksum logic
and see if that helps.
Thanks,
Ben
--
Ben Greear <greearb@candelatech.com>
Candela Technologies Inc http://www.candelatech.com
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2006-05-06 17:20 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz follow: Atom feed
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2006-05-05 6:56 Fw: [Bugme-new] [Bug 6495] New: Vlan MTU Fragmentation Andrew Morton
2006-05-05 15:57 ` Ben Greear
2006-05-06 2:39 ` Andrew Morton
2006-05-06 4:39 ` Ben Greear
2006-05-06 6:17 ` Andrew Morton
2006-05-06 17:20 ` Ben Greear
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