[dpdk-dev] Kernel Module dependency in DPDK 18.05-rc5 and earlier DPDK releases
Bruce Richardson
bruce.richardson at intel.com
Fri May 25 15:57:06 CEST 2018
On Fri, May 25, 2018 at 04:20:42PM +0300, Kevin Wilson wrote:
> Thanks, Thomas.
>
> Actually there is an EAL rte_eal_check_module() method which does this exactly:
> http://dpdk.org/browse/dpdk/tree/lib/librte_eal/linuxapp/eal/eal.c#n1089
> It is declared in eal_private.h.
>
> Is it reasonable to send a patch which moves the decalartion to eal.h
> instead so PMDs can use it in their probe() method ?
>
> Apart from it - So is there any practical effect for using the
> RTE_PMD_REGISTER_KMOD_DEP() ? or is it only a sort of declarative
> macro, saying that the PMD is dependent on the specified kernel
> modules ? In the past - did it really ever check for dependency and
> shouted back
> when the required modules specified in the RTE_PMD_REGISTER_KMOD_DEP()
> macro were not found ?
>
AFAIK this information is only used for reporting out when running pmdinfo
on a driver or statically linked binary. It was never enforced at runtime,
simply because the lack of particular ports was never an error. If a module
was not loaded, and NICs not bound to that module, it was always assumed
that the ports were never meant to be used by DPDK anyway.
/Bruce
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