Date: Wed, 24 Feb 2010 08:40:03 GMT From: Jean-Luc Richier <Jean-Luc.Richier@imag.fr> To: freebsd-net@FreeBSD.org Subject: Re: kern/141843: [em] [vlan] Intel txcsum and assigned vlan invoke wrong dst MAC in TCP packets Message-ID: <201002240840.o1O8e3d7055985@freefall.freebsd.org>
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The following reply was made to PR kern/141843; it has been noted by GNATS.
From: Jean-Luc Richier <Jean-Luc.Richier@imag.fr>
To: bug-followup@FreeBSD.org, dyr@smartspb.net
Cc:
Subject: Re: kern/141843: [em] [vlan] Intel txcsum and assigned vlan invoke
wrong dst MAC in TCP packets
Date: Wed, 24 Feb 2010 09:19:29 +0100
A other cause (or the same) seems that when the interface is reset (for
example with a ifconfig em0 down, the chip is reset, but the
last_hw_offload in the interface context is not reset
I just had the following problem in FreeBSD8.0 RELEASE
# ping www.google.com
It works
# ifconfig em0 down up
# ping www.google.com
It does not work
# telnet -N <ipv4 router addr>
Normal error message
# ping www.google.com
It works
I made the following path to solve the problem (in em_stop):
--- /sys/dev/e1000/if_em.c.DIST 2009-10-25 02:10:29.000000000 +0100
+++ /sys/dev/e1000/if_em.c 2010-02-23 18:22:53.000000000 +0100
@@ -2710,6 +2710,7 @@
ifp->if_drv_flags &= ~(IFF_DRV_RUNNING | IFF_DRV_OACTIVE);
e1000_reset_hw(&adapter->hw);
+ adapter->last_hw_offload = 0;
if (adapter->hw.mac.type >= e1000_82544)
E1000_WRITE_REG(&adapter->hw, E1000_WUC, 0);
}
--
Jean-Luc RICHIER (Jean-Luc.Richier@Imag.Fr)
Laboratoire d'Informatique de Grenoble (LIG)
Campus de Grenoble
681 rue de la Passerelle
BP 72, F-38402 St Martin d'Hères Cedex
Tel : +33 4 76 82 72 32 Fax : +33 4 76 82 72 87
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