how to use ippcp in linux kernel-mode

[huang__zhongqiang]

I only called ippcpGetLibVersion in the kernel-level source file test.c,

/* Some other headers */

#include "ippcp.h"
#include "ippcpdefs.h"

MODULE_DESCRIPTION("ipp sm3 test for crypto module");
MODULE_LICENSE("GPL");

static int __init ipp_sm3_test_init(void)
{ 
    const IppLibraryVersion* lib = ippcpGetLibVersion();
    printk("get ippcp version:\n%s %s %d.%d.%d.%d\n\n", lib->Name, lib->Version, lib->major, lib->minor, lib->majorBuild, lib->build);
    return 0;
}    
    
static void __exit ipp_sm3_test_free(void)
{        
        printk("ipp_sm3_test_free.\n");
}

module_init(ipp_sm3_test_init); 
module_exit(ipp_sm3_test_free);

And in Makefile:

TARGET = test.ko
test-objs := /nonpic/libippcp.a
ccflags-y += $(FLAG) -I$(KERNELDIR)/include -D__KERNEL__ -DMODULE -fno-pic -DEXPORT_SYMTAB -mcmodel=kernel

After excuting 'insmod test.ko', the console outputs:

overflow in relocation type 10 val ****
'test' likely not compiled with -mcmodel=kernel

How do I resolve this issue? Can ippcp be used in linux kernel-mode?

Some informations:

ippcpGetLibVersion in user mode returns: 
  ippCP AVX (e9) 2019.0.0 (r0x438f167) 2019.0.0.7084067

ippcp version: l_ippcp_2019.0.117
     Compiler: cc (GCC) 4.4.7 20120313 (Red Hat 4.4.7-3)
 Architecture: Linux 3.4.87 x86_64
           OS: CentOS release 6.4 (Final)
          CPU: Intel(R) Xeon(R) CPU E3-1275 V2 @ 3.50GHz

----

I installed different versions of ippcp library in two machines. The other machine is Linux algo 3.13.0-32-generic #57-Ubuntu x86_64 GNU/Linux.

1. If I copied libippcp.a (version 2019.0.117) to the other machine, same error occurs ('likely not compiled with mcmodel=kernel').
2. But if I copied libippcp.a (version 2018.1.176) from the other machine to this one, it works!!

Now my module can be successfully loaded.

[Igor_A_Intel]

Hi,

please provide all output from the ippcpGetLibVersion() (guess you can run it in the user mode), or please provide: library version, architecture (ia32 or x64), cpu, OS, cctools version, etc.

regards, Igor

[Pavel_B_Intel1]

Hi,

also please provide part of code where you call the IPP function.

Pavel

[huang__zhongqiang]

Hi Igor, Pavel,

I've added more details to my question.

Maybe I should recompile the ippcp library with mcmodel=kernel, but I didn't see any configuration about mcmodel in the installation process.

[Pavel_B_Intel1]

Hi,

thanks for information. Please give us some time to investigate the problem. I will return 2-3 weeks late.

Pavel

[Pavel_B_Intel1]

We found a problem, thank you for the reporting. The problem will be fixed in next release.

Pavel

[Sergey_K_Intel4]

Hi, Huang,

Thanks you for reporting of the problem. Definitely, wrong tool has been used inside IPP Crypto build procedures. Believe I've fixed that.

I've successfully re-build your sample using updated library. I don't have root rights and our IT guys did the insertion of the "test_kernel" into the Linux kernel. Seems, the module has been inserted. At least "lsmod" reports:

-bash-4.2$ lsmod | grep test
test_kernel             8255  0

Both Open Source and commercial version of IPP Crypto will be updated soon. I'll inform you as soon as update will be available,

Regards, Sergey