re hardware offload broken

[Arto Huusko <arto.huusko%pp2.inet.fi@localhost>]

Hello,

on amd64 -current compiled from sources checked out a few minutes ago,
re hardware offload is broken. On an older 5.99.7 (a week or two ago),
it worked flawlessly.

As far as I could see, nothing worked: no packet was sent succesfully.
I didn't investigate which was the cause, but I had ip4csum, tcp4csum
and udp4csum activated.

In addition to this, my re had tso4 option available previously, but
it is no longer listed.

The card attaches (now) as:

re0 at pci2 dev 0 function 0: RealTek 8168B/8111B PCIe Gigabit Ethernet 
(rev. 0x01)
re0: interrupting at ioapic0 pin 17
re0: Ethernet address 00:13:8f:eb:63:36
re0: using 256 tx descriptors
rgephy0 at re0 phy 7: RTL8169S/8110S/8211 1000BASE-T media interface, rev. 2
rgephy0: 10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, 1000baseT, 
1000baseT-FDX, auto