Hi DPDK devs,

I'm hitting a build failure with dpdk 20.02.1 with rte_ethdev.h that's 
happening seemingly at random:
make install T=arm64-armv8a-linuxapp-gcc -j
In file included from 
/tmp/openvpp-testing/dpdk/lib/librte_ethdev/rte_class_eth.c:13:0:
/tmp/openvpp-testing/dpdk/lib/librte_ethdev/rte_ethdev.h:4287:10: fatal error: 
rte_ethdev_core.h: No such file or directory
#include <rte_ethdev_core.h>
          ^~~~~~~~~~~~~~~~~~~
compilation terminated.
make[5]: *** [rte_class_eth.o] Error 1
make[5]: *** Waiting for unfinished jobs....
make[4]: *** [librte_ethdev] Error 2
make[3]: *** [lib] Error 2
make[2]: *** [all] Error 2
make[1]: *** [pre_install] Error 2
make: *** [install] Error 2

Full log here: 
https://logs.fd.io/production/vex-yul-rot-jenkins-1/csit-dpdk-perf-verify-master-3n-tsh/11/archives/log.html.gz

This doesn't happen every time. It took me five builds on two machines (for a 
total of 10 builds) to hit this issue, but it did eventually happen. I tried 
this with 20.02 at first and it seemed to be happening more frequently, but I 
don't have enough data to really tell if there's an actual difference in 
frequency.

We're not doing anything special, just downloading and extracting the archive, 
then setting CONFIG_RTE_LIBRTE_MLX5_PMD and 
CONFIG_RTE_LIBRTE_I40E_16BYTE_RX_DESC to y in config/common_base and then 
running make install T=arm64-armv8a-linuxapp-gcc -j. As mentioned in the 
subject, the build server is a Taishan ARM server.

Any ideas on how to fix (or workaround) this? Is there a chance meson build 
would fix this? If so, how do we make sure we build testpmd with mxl5 support 
and how do we set CONFIG_RTE_LIBRTE_I40E_16BYTE_RX_DESC with meson build?

Thanks,
Juraj

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