This looks fine, so my guess is that you aren't actually inserting the
new kernel module with this code. You should be sure that you use
insmod to load the file that you compiled
On Thu, Sep 17, 2015 at 10:22 PM, liu_ch...@buaa.edu.cn
<liu_ch...@buaa.edu.cn> wrote:
> Oh I'm sorry for dropping the mailing list.
>
> I think I do put the printk in the packet processing path. I am going to
> describe what I did below:
>
> I put printk in the function ovs_vport_recieve() in vport.c, in
> ovs_dp_process_recieved_packet() in datapath.c, in ovs_flow_key_extract()
> and key_extract() in flow.c
> Here is what I put in the vport.c file, the italic and bold code is what I
> added, just a test code.
> void ovs_vport_receive(struct vport *vport, struct sk_buff *skb,
> struct ovs_key_ipv4_tunnel *tun_key)
> {
> struct pcpu_sw_netstats *stats;
>
> stats = this_cpu_ptr(vport->percpu_stats);
>
> u64_stats_update_begin(&stats->syncp);
> stats->rx_packets++;
> stats->rx_bytes += skb->len;
> u64_stats_update_end(&stats->syncp);
> pr_info("*****This is in ovs_vport_recieve() function*****\n");
> pr_info("Packet recieved.\n");
> pr_info("*****End of this test place*****\n");
> OVS_CB(skb)->tun_key = tun_key;
> ovs_dp_process_received_packet (vport, skb);
> }
> There is function pr_info in the posted code, but I do tried printk first
> and it did not work so I try this. I also define the macro #define
> pr_fmt(fmt) KBUILD_MODNAME ": " fmt at the first of these files.
> BTW, the ovs version I use is ovs-2.3.1, my OS is Ubuntu 12.04.
>
> I am really appreciate for your reply and I am looking forward to your
> opinion.
> Thanks a lot!
> Chang
> ________________________________
> 祝好，
> 刘畅
>
>
> From: Jesse Gross
> Date: 2015-09-18 00:34
> To: liu_ch...@buaa.edu.cn
> CC: dev@openvswitch.org
> Subject: Re: [ovs-dev] How to debug openvswitch
> On Thursday, September 17, 2015, liu_ch...@buaa.edu.cn
> <liu_ch...@buaa.edu.cn> wrote:
>>
>> Thanks a lot for your reply!
>> But I have tried this command many times, what I saw was something like
>> "br0 is left/enter promiscuous mode" which occures when I use ovs-vsctl
>> add-br or ovs-vsctl add-port commands.
>> If there any tips of the methods or functions I can use to see the kernel
>> output information? I've tried printk() and pr_info() in datapath.c, flow.c
>> and vport.c, but they didn't work.
>> What I want is let ovs output some information to the console (or log file
>> is OK) when the datapath recieves and processes packets.
>
>
> Please don't drop the mailing list.
>
> printk should output to dmesg. Without seeing the code, it's impossible to
> know why it is not showing up. Are you sure that you put the printk in a
> location on the packet processing path?
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