A flow path for ethernet kernel driver

[Saket Sinha]

HI ,

   If you want to go further than just the printks, you can setup a
qemu setup and attach gdb to it.
Then you can even set breakpoints to analyze it.

Let me know if you have any issues with the setup.

Regards,
Saket Sinha


On Tue, May 19, 2015 at 11:18 AM, anish singh
<anish198519851985 at gmail.com> wrote:
>
>
> On Mon, May 18, 2015 at 12:23 PM, Airton Ishimori <nobumasa.bcc at gmail.com>
> wrote:
>>
>> Hello, everybody,
>>
>> I'm trying to develop a new Ethernet driver (Realtek) for Linux kernel
>> 4.0.2.
>>
>> [    3.612938] r8169 Gigabit Ethernet driver 2.3LK-NAPI loaded
>>
>> As part of my studies, I'm trying to trace the path for functions defined
>> in drivers/net/ethernet/realtek/r8169.c, net/core/dev.c and
>> net/core/dev_ioctl.c. I'm using "printks" for this purpose. For instance,
>> something like:
>>
>> printk("TEST: __dev_set_promiscuity\n");
>>
>> However, I'm not getting what's going on. I can set/unset the promiscuity
>> behaviour via ifconfig command.
>>
>> [  131.330091] device eth0 entered promiscuous mode
>> [  170.619086] device eth0 left promiscuous mode
>>
>> By looking at the dmesg output above, I thought the function that deals
>> with promiscuity was __dev_set_promiscuity() defined in net/core/dev.c,
>> because this function calls a function to print the message above:
>>
>> pr_info("device %s %s promiscuous mode\n", dev->name, dev->flags &
>> IFF_PROMISC ? "entered" : "left");
>>
>> But, when I tried to look for my printk message with dmesg after compiling
>> and running the kernel, I couldn't find it.
>>
>> $ cd linux-4.0.2/
>> $ make net && make modules
>> $ sudo make modules_install && sudo make install
>>
>> Can somebody help me to understand what's happening?
>
>
> There are only two reasons why your printk is not coming
> 1. Your printk is not executing.
> 2. Your driver is not getting installed.
> Have you verified both of these points?
>>
>>
>> Thanks in advance,
>>
>> --
>> Airton Ishimori
>>
>>
>> _______________________________________________
>> Kernelnewbies mailing list
>> Kernelnewbies at kernelnewbies.org
>> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
>>
>
>
> _______________________________________________
> Kernelnewbies mailing list
> Kernelnewbies at kernelnewbies.org
> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
>