improved TSO interface needed

[Kip Macy]

> 64K is the max, and I believe that is taking into account the headers.
> What size are you seeing that is larger?  Even if an mbuf chain comes
> down that large, it does NOT form a single packet, it is packetized by
> the hardware into MTU size, as I said, on the wire, ie as the receiver
> sees it, its just a lot of packets. The only question is whether the
> transmit hardware can handle it. Do you have eivdence of some
> hardware that supports TSO in the driver that cant??

I see this when torture testing a couple of different 10GigE cards
running at line rate.

                               -Kip