On Sun, 9 Feb 2003, Dave Huang wrote:

> On Sun, Feb 09, 2003 at 05:49:54PM +0100, Pavel Cahyna wrote:
> > > Yes, the wm driver can do it, but can't use hardware checksums + vlans at
> > > the same time.
> >
> > Thanks! It would be good to have an note in wm(4) man page about this,
> > as it is there already for ex(4).
>
> The manpage has had the note since August 2002, actually:
>
>      The i8254x supports IPv4/TCP/UDP checksumming in hardware.
>      The wm driver supports this feature of the chip.  See
>      ifconfig(8) for information on how to enable this feature.

Note that the wm driver has issues doing forwarding with checksumming
turned on. Something messes up and the outgoing packet gets damaged. I
have a PR open on this.

Take care,

Bill