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

[Neil Horman]

On Tue, May 16, 2017 at 12:51:40PM +0200, Jan Viktorin wrote:
> Hello Jimmy,
> 
> On Tue, 16 May 2017 15:38:22 +0530
> Jimmy Carter <jimmycarter256 at 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.
> 
I don't think so.  cpu_set_t is most recently defined in
/usr/include/bits/shced.h, which is a glibc header.  What version of glibc are
you building with?

Neil

> > 
> > 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
>