[v5,0/7] Introduce support for LoongArch architecture

  From: zhoumin <zhoumin@loongson.cn>

Dear team,

The following patch set is intended to support DPDK running on LoongArch
architecture.

LoongArch is the general processor architecture of Loongson Corporation
and is a new RISC ISA, which is a bit like MIPS or RISC-V.

The online documents of LoongArch architecture are here:
    https://loongson.github.io/LoongArch-Documentation/README-EN.html

The latest build tools for LoongArch (binary) can be downloaded from:
    https://github.com/loongson/build-tools

v5:
    - merge all patches for supporting LoongArch EAL into one patch
    - add LoongArch cross compilation document and update some documents
      related to architecture
    - remove vector stubs added for LoongArch in net/i40e and net/ixgbe
    - add LOONGARCH64 cross compilation job in github ci

v4:
    - rebase the patchset on the main repository of version 22.07.0

v3:
    - add URL for cross compile tool chain
    - remove rte_lpm_lsx.h which was a dummy vector implementation
      because there is already a scalar implementation, thanks to
      Michal Mazurek
    - modify the name of compiler for cross compiling
    - remove useless variable in meson.build

v2:
    - use standard atomics of toolchain to implement
      atomic operations
    - implement spinlock based on standard atomics

Min Zhou (7):
  eal/loongarch: support LoongArch architecture
  net/ixgbe: add vector stubs for LoongArch
  net/memif: set memfd syscall ID on LoongArch
  net/tap: set BPF syscall ID for LoongArch
  examples/l3fwd: enable LoongArch operation
  test/cpuflags: add test for LoongArch cpu flag
  ci: add LOONGARCH64 cross compilation job

 .ci/linux-build.sh                            |   9 +
 .github/workflows/build.yml                   |  10 +-
 MAINTAINERS                                   |   6 +
 app/test/test_cpuflags.c                      |  41 +++
 app/test/test_xmmt_ops.h                      |  12 +
 .../loongarch/loongarch_loongarch64_linux_gcc |  16 ++
 config/loongarch/meson.build                  |  43 +++
 doc/guides/contributing/design.rst            |   2 +-
 .../cross_build_dpdk_for_loongarch.rst        |  87 ++++++
 doc/guides/linux_gsg/index.rst                |   1 +
 doc/guides/nics/features.rst                  |   6 +
 doc/guides/nics/features/default.ini          |   1 +
 doc/guides/nics/features/ixgbe.ini            |   1 +
 doc/guides/rel_notes/release_22_11.rst        |   6 +
 drivers/net/i40e/meson.build                  |   6 +
 drivers/net/ixgbe/ixgbe_rxtx.c                |   7 +-
 drivers/net/memif/rte_eth_memif.h             |   2 +
 drivers/net/tap/tap_bpf.h                     |   2 +
 examples/l3fwd/l3fwd_em.c                     |   8 +
 lib/eal/linux/eal_memory.c                    |   4 +
 lib/eal/loongarch/include/meson.build         |  21 ++
 lib/eal/loongarch/include/rte_atomic.h        | 253 ++++++++++++++++++
 lib/eal/loongarch/include/rte_byteorder.h     |  46 ++++
 lib/eal/loongarch/include/rte_cpuflags.h      |  39 +++
 lib/eal/loongarch/include/rte_cycles.h        |  53 ++++
 lib/eal/loongarch/include/rte_io.h            |  18 ++
 lib/eal/loongarch/include/rte_mcslock.h       |  18 ++
 lib/eal/loongarch/include/rte_memcpy.h        |  61 +++++
 lib/eal/loongarch/include/rte_pause.h         |  24 ++
 lib/eal/loongarch/include/rte_pflock.h        |  17 ++
 .../loongarch/include/rte_power_intrinsics.h  |  20 ++
 lib/eal/loongarch/include/rte_prefetch.h      |  47 ++++
 lib/eal/loongarch/include/rte_rwlock.h        |  42 +++
 lib/eal/loongarch/include/rte_spinlock.h      |  90 +++++++
 lib/eal/loongarch/include/rte_ticketlock.h    |  18 ++
 lib/eal/loongarch/include/rte_vect.h          |  65 +++++
 lib/eal/loongarch/meson.build                 |  11 +
 lib/eal/loongarch/rte_cpuflags.c              |  94 +++++++
 lib/eal/loongarch/rte_cycles.c                |  45 ++++
 lib/eal/loongarch/rte_hypervisor.c            |  11 +
 lib/eal/loongarch/rte_power_intrinsics.c      |  51 ++++
 meson.build                                   |   2 +
 42 files changed, 1312 insertions(+), 4 deletions(-)
 create mode 100644 config/loongarch/loongarch_loongarch64_linux_gcc
 create mode 100644 config/loongarch/meson.build
 create mode 100644 doc/guides/linux_gsg/cross_build_dpdk_for_loongarch.rst
 create mode 100644 lib/eal/loongarch/include/meson.build
 create mode 100644 lib/eal/loongarch/include/rte_atomic.h
 create mode 100644 lib/eal/loongarch/include/rte_byteorder.h
 create mode 100644 lib/eal/loongarch/include/rte_cpuflags.h
 create mode 100644 lib/eal/loongarch/include/rte_cycles.h
 create mode 100644 lib/eal/loongarch/include/rte_io.h
 create mode 100644 lib/eal/loongarch/include/rte_mcslock.h
 create mode 100644 lib/eal/loongarch/include/rte_memcpy.h
 create mode 100644 lib/eal/loongarch/include/rte_pause.h
 create mode 100644 lib/eal/loongarch/include/rte_pflock.h
 create mode 100644 lib/eal/loongarch/include/rte_power_intrinsics.h
 create mode 100644 lib/eal/loongarch/include/rte_prefetch.h
 create mode 100644 lib/eal/loongarch/include/rte_rwlock.h
 create mode 100644 lib/eal/loongarch/include/rte_spinlock.h
 create mode 100644 lib/eal/loongarch/include/rte_ticketlock.h
 create mode 100644 lib/eal/loongarch/include/rte_vect.h
 create mode 100644 lib/eal/loongarch/meson.build
 create mode 100644 lib/eal/loongarch/rte_cpuflags.c
 create mode 100644 lib/eal/loongarch/rte_cycles.c
 create mode 100644 lib/eal/loongarch/rte_hypervisor.c
 create mode 100644 lib/eal/loongarch/rte_power_intrinsics.c