powerpc64*: port mlx5, OFED, KTLS and krping

[pkubaj]

Summary

This review ports mlx5 driver, kernel's OFED stack (userland is already enabled), KTLS and krping to powerpc64 and powerpc64le.

krping requires a small change since it uses assembly for amd64 / i386.

NOTE: On powerpc64le RDMA works fine in the userspace with libmlx5, but on powerpc64 it does not. The problem is that contrib/ofed/libmlx5/doorbell.h checks for SIZEOF_LONG but this macro exists on neither powerpc64* nor amd64. Thus, the file silently goes to the fallback function written for 32-bit architectures. It works fine on little-endian architectures, but causes a hard fail on big-endian. It's possible it may also cause some runtime issues on little-endian. Thus, on powerpc64 I verified that RDMA works with krping.

[• hselasky]

Have a look at my comment. Looks good!

sys/contrib/rdma/krping/krping.c

77

Is the builting supported for amd64 and i386 aswell?

[pkubaj]

sys/contrib/rdma/krping/krping.c

77

Apparently it is, but I have not tested on amd64 and i386. According to https://clang.llvm.org/docs/LanguageExtensions.html#builtin-functions, it works everywhere.

[jhb]

FWIW, I would probably have split this up into a few commits to make it easier for someone in the future to bisect if this triggers some kind of breakage (e.g. KERN_TLS separate from base mlx5 separate from OFED)