HI,
I am working on a project that needs detailed understanding of the kernel
module datapath,
the setup us Ubuntu 14.04 with OVS 2.4.0 as:
allan@allan-i7A:~/openvswitch-2.4.0$ uname -a
Linux allan-i7A 3.19.0-25-generic #26~14.04.1-Ubuntu SMP Fri Jul 24
21:16:20 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
allan@allan-i7A:~/openvswitch-2.4.0$
I have a VM send packets to OVS (vent0 of br0) and try to use printk() and
dump_stack() in
the following functions to observe what happens:
netdev_frame_hook() vport-netdev.c
netdev_port_receive() vport-netdev.c
ovs_vport_receive() vport.c
ovs_vport_send() vport.c
ovs_dp_process_packet datapath.c
printk() and dump_stack do not work.
My questions are:
1. What is the most effective way to trouble shoot OVS kernel module?
2. What is the proper way to use printk() and dump_stack()
3. What are the kernel module functions used for receiving packets?
4. How about kgdb and kdb? (I tried with a desk top computer with Ubuntu 14.04,
couldn’t get console
put of freeze).
Pointers or instructions will be really appreciated.
— Allan
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