From owner-freebsd-net@FreeBSD.ORG  Fri Jun 12 17:07:03 2009
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Date: Fri, 12 Jun 2009 17:07:03 +0000
From: Navdeep Parhar <np@FreeBSD.org>
To: "Bjoern A. Zeeb" <bz@FreeBSD.org>
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	Andrew Thompson <thompsa@freebsd.org>,
	Jack F Vogel <jfv@freebsd.org>,
	Andrew Gallatin <gallatin@freebsd.org>,
	Pyun YongHyeon <yongari@freebsd.org>,
	"George V. Neville-Neil" <gnn@freebsd.org>
References: <20090611184555.J22887@maildrop.int.zabbadoz.net>
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Cc: Pyun YongHyeon <pyunyh@gmail.com>,
	FreeBSD net mailing list <freebsd-net@freebsd.org>,
	"George V. Neville-Neil" <gnn@freebsd.org>,
	Michael Tuexen <tuexen@freebsd.org>, Andrew Thompson <thompsa@freebsd.org>,
	Jack F Vogel <jfv@freebsd.org>, Andrew Gallatin <gallatin@freebsd.org>,
	Pyun YongHyeon <yongari@freebsd.org>
Subject: Re: Ethernet NIC drivers depending unconditionally on INET
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On Fri, Jun 12, 2009 at 10:56:31AM +0000, Bjoern A. Zeeb wrote:
> On Fri, 12 Jun 2009, Pyun YongHyeon wrote:
> 
> Hi,
> 
> >Yeah, there are no checksum offloading support for IPv6 under
> >FreeBSD so there are no cases the frames are IPv6 when
> >CSUM_IP/CSUM_TCP/CSUM_UDP/CSUM_TSO was set.
> 
> The thing that scared me was sys/netinet/tcp_subr.c:tcp_maxmtu6().
> 
> What I had missed was the CSUM_TSO6  (the 6 at the end) part.
> grepping through the tree I am even wondering a lot more now when I
> see what cxgb(4) is doing with that;)

I can't find a CSUM_TSO6 in head, did you mean IFCAP_TSO6?  cxgb(4)
will not let you enable IFCAP_TSO6 on the interface.  It has always
been disallowed as far as I can tell.

Regards,
Navdeep