A flow path for ethernet kernel driver

[nobumasa.bcc@gmail.com (Airton Ishimori)]

Hi, Saket,

Thanks for the tip!


*--*Airton Ishimori


On Tue, May 19, 2015 at 2:53 AM, Saket Sinha <saket.sinha89@gmail.com>
wrote:

> 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@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
> >>
> >>
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> >>
> >
> >
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