How can I enable debug mode in a dpdk-based applic

问题:

I encounter some errors when running a dpdk-based application. I find the error occurs when invoking rte_eth_dev_configure() function provided by dpdk library. The error code is -22. However, I want the application to show more debug information so that I can quickly focus on the error part.

I did RTFM and modified $RTE_SDK/build/.config. I turned RTE_LIBRTE_ETHDEV_DEBUG to be y. But It didn't work. Where does rte_vlog() function put log messages?

Would you like to help me? Any suggestion is appreciated!

回答1:

You should also change the default log level, otherwise all the debug messages will be compiled out during the compilation, i.e.:

RTE_LOG_LEVEL=RTE_LOG_DEBUG
RTE_LIBRTE_ETHDEV_DEBUG=y

Please also have a look at EXTRA_CFLAGS. You might also want to add the debug symbols and disable optimizations, i.e.:

make EXTRA_CFLAGS="-O0 -g" ...

回答2:

I add CONFIG_ RTE_LIBRTE_ETHDEV_DEBUG=y to the ${RTE_SDK}/config/defconfig_{RTE_TARGET} config file and rebuild the target. It works.