sk/skc/makphy breakage on current

[Gary Duzan <gary%duzan.org@localhost>]

   Has anyone else had problems with sk ethernet recently? It seems
to gradually get worse, trashing my connections, hanging NFS, and
once actually panicing:

skc0 at pci5 dev 6 function 0: ioapic0 pin 21
skc0: interrupt moderation is 0 us
skc0: DGE-530T Gigabit Ethernet Adapter rev. (0x9)
sk0 at skc0 port A: Ethernet address 00:15:e9:bd:0c:1e
makphy0 at sk0 phy 0: Marvell 88E1011 Gigabit PHY, rev. 5
skc0: interrupt moderation is 1000 us
panic: sk_jfree: buffer not in use!

   I'm running on amd64. I've switched to an rtk ethernet for now,
and so far it hasn't given me any problems.

   Thanks.

                                        Gary Duzan