Re: [dpdk-users] Issue->Dpdk for arm cortex-a15 compilation

[Jan Viktorin <viktorin@rehivetech.com>]

Hello Jimmy,

On Tue, 16 May 2017 15:38:22 +0530
Jimmy Carter <jimmycarter256@gmail.com> wrote:

> Hi All
> 
> I am using dpdk16.11.1 and want to use openwrt external toolchain so that I
> can cross compile for arm cortex 15
> neon.(arm_cortex-a15+neon-vfpv4_gcc-5.4.0_musl_eabi)

I've never built DPDK with musl-eabi. I don't think that your issue is
related but just note that my builds have always been done with gnueabi.

> My target board is Tp link archer C2600.
> I am have assigned these env variables but still getting compilation error
> 
> export
> STAGING_DIR=/home/xav-101000739/ovslede/source/staging_dir/toolchain-arm_cortex-a15+neon-vfpv4_gcc-5.4.0_musl_eabi
> export
> PATH=$PATH:/home/xav-101000739/ovslede/source/staging_dir/toolchain-arm_cortex-a15+neon-vfpv4_gcc-5.4.0_musl_eabi/bin
> 
> 
> export CROSS=arm-openwrt-linux-
> export DPDK_TARGET=arm-armv7a-linuxapp-gcc
> export DPDK_DIR=$PWD
> export DPDK_BUILD=$DPDK_DIR/$DPDK_TARGET
> export
> CFLAGS+=-I/home/xav-101000739/ovslede/source/staging_dir/toolchain-arm_cortex-a15+neon-vfpv4_gcc-5.4.0_musl_eabi
> export RTE_SDK=$PWD
> export RTE_TARGET=arm-armv7a-linuxapp-gcc
> export DPDK_BUILD_DIR=arm-armv7a-linuxapp-gcc
> 

There is a patch to Buildroot that can help you with the setup. See:

 https://patchwork.ozlabs.org/patch/611383/

> 
> Error:Attached file

Your build fails on

eal_memory.c:92:
/home/xav-101000739/Downloads/dpdk/dpdk-stable-16.11.1/build/include/rte_lcore.h:56:10: error: unknown type name 'cpu_set_t'
  typedef cpu_set_t rte_cpuset_t;

This looks like there is some issue with Linux Kernel headers.

lib/librte_eal/common/include/rte_lcore.h:

 53 #if defined(__linux__)
 54         typedef cpu_set_t rte_cpuset_t;
 55 #elif defined(__FreeBSD__)
 56 #include <pthread_np.h>
 57         typedef cpuset_t rte_cpuset_t;
 58 #endif

Probably, you should set the RTE_KERNELDIR properly.

> 
> Please advise
> Does dpdk have support for openwrt (arm cortex a15)

DPDK does not support OpenWRT because (as far as I know) nobody from
the DPDK community is using it in this way. I build DPDK via Buildroot
but this is unsupported by the DPDK upstream.

I could build DPDK for Cortex-A7, Cortex-A9 and Cortex-A15 in the past.

I run regular builds of the master branch and I can see no breakage
for the arm-armv7a-linuxapp-gcc configuration.

Regards
Jan

> 
> Thanks
> Akshay