How to add .o file in the Linux Kernel

[geewhan]

I would like to know how would you enable the Congestion Control Algorithm correctly (lets call it Tcp_quic or quic).

My code is almost exactly like the tcp_veno.c file. Just the algorithm in the tcp_veno_cong_avoid() function changed.
I would like to attached the code on here, but I got an upload error. I would post it as well, but it is pretty long.

I have successfully compile the Linux Kernel with the C file (in the directory linux-3.4-rc7\net\ipv4\tcp_quic.c)
I just need to enable it, so I can use my algorithm and add it to the Kernel.

I realize that in the Linux Kernel folder(kernel\linux-3.3.6\net\ipv4), where I added the tcp_quic.c file, does not have .mod.o or .o file. With means that the tcp_quic.c did not compile successfully, right? However why did the compile in the terminal compile successfully? I read on one forum that may be I need to change something in the MAKEFILE to have .o file, is this true? I am not sure how I would do this if it is so.

I know that most people said that you should not mess with the Kernel, but it is something I would like to try.

The code below is how I want to enable the Congestion Control Algorithm.

echo quic > /proc/sys/net/ipv4/tcp_congestion_control

Also this is how I compile the Linux Kernel:

make-kpkg clean

fakeroot make-kpkg --initrd --append-to-version=-geekernel kernel_image kernel_headers
(this takes about 2 hours to compile)

[geewhan]

So far I have done that steps on editing the MAKEFILE and the Kconfig file. Where I see veno, I copy and paste another line(s) of code and replace it with the word "quic".
What I put in the MAKEFILE is

obj-$(CONFIG_TCP_CONG_QUIC) += tcp_quic.o

What I put in the Kconfig file is:
(there is a lot of editing in this one I wont list them because I basically search for "vegas/veno" to copy and paste a new one for "quic"


I did get an error when I try using the code you have recommended, but I got an Error

fakeroot CONFIG_TCP_CONG_QUIC=m make-kpkg --initrd --append-to-version=-geekernel kernel_image kernel_headers

This is the error

/usr/bin/fakeroot: line 176: CONFIG_TCP_QUIC=m: command not found

Here is the code in the fakeroot file around line 176:

export FAKEROOT_FD_BASE

if test -z "$*"; then
  FAKEROOTKEY=$FAKEROOTKEY LD_LIBRARY_PATH="$PATHS"  LD_PRELOAD="$LIB" ${SHELL:-/bin/sh}
  RESULT=$?
else
(LINE 176)  FAKEROOTKEY=$FAKEROOTKEY LD_LIBRARY_PATH="$PATHS"  LD_PRELOAD="$LIB" "$@"
  RESULT=$?
fi

exit $RESULT

Did I miss something when I edit in the MAKEFILE or Kconfig file?

Thanks

[geewhan]

I am waiting for the person who has helped me, but he/she hasn't responded for awhile so may be someone knows this.
Someone mention me something about the .config file, is that referring to kconfig file?
I ask because I do not know what that person mean by that below.

At the end of kernel configuration, "make (x|menu|whatever)config" generates a .config file which is built using all the Kconfig segments.

When that person mention this part:

You can simply edit .config and add CONFIG_TCP_CONG_QUIC=m to it. Then reconfigure using "make oldconfig" and then build the kernel using your regular "make-kpkg ..." command.

Is that person talking about the kconfig file the lines around here

	config DEFAULT_CUBIC
		bool "Cubic" if TCP_CONG_CUBIC=y

	config DEFAULT_HTCP
		bool "Htcp" if TCP_CONG_HTCP=y

	config DEFAULT_HYBLA
		bool "Hybla" if TCP_CONG_HYBLA=y

	config DEFAULT_VEGAS
		bool "Vegas" if TCP_CONG_VEGAS=y
        config DEFAULT_VENO
		bool "Veno" if TCP_CONG_VENO=y

        config DEFAULT_QUIC
		bool "Quic" if TCP_CONG_QUIC=m

Thanks