if_start() and send queue question

[gnn at freebsd.org]

At Thu, 07 Feb 2008 19:45:28 +0400,
Tofig Suleymanov wrote:
> 
> Hello list,
> 
> I will be grateful if someone could point me to the right direction 
> regarding the question below.
> 
> My device driver is getting incoming packets fine, but for some reason I 
> am not able to send a single  packet. Here is the source code: 
> http://www.freebsd.az/if_ib.c
> 
> I've added several debug messages to the source and here is the output:
> /
> /(bringing interface up and assigning the ip/netmask combination)
> /
> ifconfig ib0 192.168.0.6 netmask 255.255.255.0 up
> 
> /(and here is what I get in /var/log/messages /; /it seems to be a 
> standard arp broadcast)
> /
> Feb  7 19:14:32 schizo kernel: ib_init entered
> Feb  7 19:14:32 schizo kernel: ib_start entered
> Feb  7 19:14:32 schizo kernel: ib_encap entered
> Feb  7 19:14:32 schizo kernel: DHOST ff ff ff ff ff ff
> Feb  7 19:14:32 schizo kernel: SHOST  0 c0 ee 22  3 14
> Feb  7 19:14:32 schizo kernel: txeof entered
> Feb  7 19:14:32 schizo kernel: txeof exiting
> 
> /(now I try pinging, but no joy . I've added extra debug messages inside 
> ping.c)
> 
> /schizo# ping 192.168.0.1
> PING 192.168.0.1 (192.168.0.1): 56 data bytes
> packets sent: -1
> ping: sendto: Invalid argument
> packets sent: -1
> ping: sendto: Invalid argument
> packets sent: -1
> ping: sendto: Invalid argument
> ^C
> --- 192.168.0.1 ping statistics ---
> 3 packets transmitted, 0 packets received, 100% packet loss
> /
> 
> I have also tied to add debug messages to sys/net/if.c and 
> sys/net/netisr.c and it seems that the kernel doesn't even try to run my 
> ib_start() function.
> 

Some things to try:

1) Add debug statements to the ib_start() routine.

2) See if bpf works (tcpdump -i ib0)

3) Show us the output of:

ifconfig ib0

netstat -i

Best,
George