TDMA link cannot pass data

[Kim Culhan]

Have setup a TDMA link with Atheros hardware but cannot pass any data
over the link.

The hardware is:

ath0: <Atheros 5212> mem 0xfeb90000-0xfeb9ffff irq 17 at device 1.0 on pci5
ath0: [ITHREAD]
ath0: AR2413 mac 7.9 RF2413 phy 4.5

The setup on either end:

ifconfig wlan create wlandev ath0 wlanmode tdma ssid freebsd-tdma
tdmaslotcnt 2 tdmaslotlen 2500 tdmaslot 0 up
ifconfig bridge create
ifconfig bridge0 addm wlan0 addm em1 192.168.1.17 netmask 255.255.255.0 up
ifconfig em1 up

ifconfig wlan create wlandev ath0 wlanmode tdma ssid freebsd-tdma
tdmaslotcnt 2 tdmaslotlen 2500 tdmaslot 1 up
ifconfig bridge create
ifconfig bridge0 addm wlan0 addm em1 192.168.1.18 netmask 255.255.255.0 up
ifconfig em1 up

>From machines connected to the bridged em interfaces on either end of
the link it is not possible to
ping the opposite end or the bridge0 address on the opposite end.

Monitoring the traffic on bridge0 it is possible to see arp packets
from the opposite ends, this is
the only evidence of the link passing any traffic.

The radio interfaces:

wlan0: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST>
metric 0 mtu 1500
        ether 00:22:3f:fd:d6:57
        media: IEEE 802.11 Wireless Ethernet OFDM/24Mbps mode 11g <flag0,adhoc>
        status: running
        ssid freebsd-tdma channel 10 (2457 Mhz 11g) bssid 00:22:3f:fd:d6:57
        country US ecm authmode OPEN privacy OFF txpower 22.5 ucastrate 24
        mcastrate 24 scanvalid 60 protmode CTS wme burst tdmaslot 0
        tdmaslotcnt 2 tdmaslotlen 2500 tdmabintval 5

wlan0: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST>
metric 0 mtu 1500
        ether 00:22:3f:fd:70:ca
        media: IEEE 802.11 Wireless Ethernet OFDM/24Mbps mode 11g <flag0,adhoc>
        status: running
        ssid freebsd-tdma channel 10 (2457 Mhz 11g) bssid 00:22:3f:fd:d6:57
        country US ecm authmode OPEN privacy OFF txpower 22 ucastrate 24
        mcastrate 24 scanvalid 60 protmode CTS wme burst tdmaslot 1
        tdmaslotcnt 2 tdmaslotlen 2500 tdmabintval 5

Any help on this is very greatly appreciated.

Some background on the FreeBSD TDMA work can be found here:

http://people.freebsd.org/~sam/FreeBSD_TDMA-20090921.pdf

regards
-kim  w8hd

--
w8hdkim at gmail.com