[LARTC] tc is broken for "protocol arp" filters

[LARTC] tc is broken for "protocol arp" filters

[gypsy]

I have tested Devik's tc (103592 bytes) and 2.6.8 which I compiled. 
Both return "RTNETLINK answers: Invalid argument".  

Stephen Hemminger should be sent a patch that fixes this.

An example that returns the above error message is:
tc filter add dev eth1 parent 1: protocol arp prio 5 u32 \
   match u16 0x0806 0xffff at -2 flowid 1:50

I'm using this because it works:
# Example that matches ARP (a big "thank you" to Martin Brown for
this!):
# dst MAC is 6 bytes at -14
# src MAC is 6 bytes at -8
# the ARP protocol is 2 bytes at -2
# the "0806" comes from linux/include/linux/if_ether.h
tc filter add dev eth1 parent 1: protocol ip prio 5 u32 \
   match u16 0x0806 0xffff at -2 flowid 1:50

gypsy
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