[dpdk-dev] [PATCH] eal: fix detection of static or shared DPDK builds

[Pai G, Sunil]

Hi Bruce,

Thanks for the fix.
I do see the issue mentioned when using DPDK shared libs with OVS and this patch fixes it.

However, I saw the issue only for system installed DPDK but not for directory installed DPDK.

 
> I saw this issue with OVS, where I was getting weird failures about ports not
> being bound (in case of physical ports) or not being created (in case of virtio
> ports), when using a shared build. Since it's potentially serious, I'd appreciate
> if someone can reproduce the issue and verify the fix so we can consider it
> for 21.02 inclusion.
> 
> To demonstrate this with regular DPDK, do a usual build of DPDK and then do
> "ninja install" to install system-wide. Then build an example app, e.g.
> l2fwd, using "make" from the examples/l2fwd directory. Running the
> example normally, e.g. ./build/l2fwd -c F00, leads to no drivers being loaded
> or ports being found. Adding "-d /path/to/drivers" e.g.
> "/usr/local/lib/x86_64-linux-gnu/dpdk/pmds-21.1" on my system works as
> expected. This shows the driver loading is not correct.
> 
> After applying this patch and re-running "ninja install", l2fwd should run the
> same with and without the "-d" flag.
> 
> /Bruce

Tested-by: Sunil Pai G <sunil.pai.g at intel.com>