[PATCH v4 0/8] Introduce support for RISC-V architecture

[PATCH v4 0/8] Introduce support for RISC-V architecture

[Stanislaw Kardach]

This patchset adds support for building and running DPDK on 64bit RISC-V
architecture. The initial support targets rv64gc (rv64imafdc) ISA and
was tested on SiFive Unmatched development board with the Freedom U740
SoC running Linux (freedom-u-sdk based kernel).
I have tested this codebase using DPDK unit and perf tests as well as
test-pmd, l2fwd and l3fwd examples.
The NIC attached to the DUT was Intel X520-DA2 which uses ixgbe PMD.
On the UIO side, since U740 does not have an IOMMU, I've used igb_uio,
uio_pci_generic and vfio-pci noiommu drivers.

Functional verification done using meson tests. fast-tests suite passing with
the default config.

PMD verification done using a Intel x520-DA2 NIC (ixgbe) and the test-pmd
application. Packet transfer checked using all UIO drivers available for
non-IOMMU platforms: uio_pci_generic, vfio-pci noiommu and igb_uio.

The i40e PMD driver is disabled on RISC-V as the rv64gc ISA has no vector
operations.

RISCV support is currently limited to Linux as the time measurement frequency
discovery is tied to reading a device-tree node via procfs.

Clang compilation currently not supported due to issues with missing relocation
relaxation.

Commit 1 introduces EAL and build system support for RISC-V architecture
   as well as documentation updates.
Commits 2-5 add missing defines and stubs to enable RISC-V operation in
   non-EAL parts.
Commit 6 adds RISC-V specific cpuflags test.
Commits 7-8 add RISC-V build testing to test-meson-builds.sh and github CI.

I appreciate Your comments and feedback.

Best Regards,
Stanislaw Kardach

v4:
  - Update RISC-V cross-compilation docs to remove vendor-specific instructions
    and better match the Ubuntu environment.
  - Remove optional "fence" removal in the CYCLE and TIME counter reads as
    those are irrelevant compared to the cost of a firmware call that allowed
    such removal. The per-platform build-configuration is left in meson files
    for setting '-mtune' and reference for future platforms.
  - Update cross-files to specify PKG_CONFIG_LIBDIR instead of relying on the
    riscv64-linux-gnu-pkg-config wrapper which was removed from Ubuntu anyway.
    Also use sys_root properly instead of using c_args directly.
  - Note: rte_rdtsc handling is left as it was in v3: TIME counter default,
    CYCLE via compile-time option. This is mostly due to CYCLE being core-local
    with values differing among cores which causes timer_autotest to run overly
    long if it so happens that CYCLE on core 0 is ahead of other cores' CYCLEs.
    This makes TIME counter more stable for general usage. Since CYCLE read in
    userspace can be disabled by the kernel-mode (it isn't currently), the
    compile-time approach is taken, same as with Aarch64.
  - Added details on --no-huge tests failing in the known_issues.rst.
  - Additional notes on tests:
    - link_bonding_mode4_autotest succeeds and then dpdk-test fails with
      segmentation fault randomly when run directly (via DPDK_TEST env
      variable) with MALLOC_PERTURB_. This was not noticed in any other test
      suggesting that there is a race condition somewhere in the link_bonding
      PMD that leads to use-after-free (since MALLOC_PERTURB_ causes free() to
      re-initialize freed memory to a given value).
    - ipsec_perf_autotest currently does not check whether there is any crypto
      device available (as ipsec_autotest does) and therefore fails.
v3:
  - Limit test-meson-builds.sh testing to a generic rv64gc configuration.
    Previous version was missing this change by mistake.
v2:
  - Separate bug-fixes into separate series.
  - Prevent RV64_CSRR leak to API users.
  - Limit test-meson-builds.sh testing to a generic rv64gc configuration.
  - Clean-up release notes and fix style issues.

[1] http://lists.infradead.org/pipermail/opensbi/2021-June/001219.html

Michal Mazurek (2):
  eal: add initial support for RISC-V architecture
  test/cpuflags: add test for RISC-V cpu flag

Stanislaw Kardach (6):
  net/ixgbe: enable vector stubs for RISC-V
  net/memif: set memfd syscall ID on RISC-V
  net/tap: set BPF syscall ID for RISC-V
  examples/l3fwd: enable RISC-V operation
  devtools: add RISC-V to test-meson-builds.sh
  ci: add RISCV64 cross compilation job

 .ci/linux-build.sh                            |   4 +
 .github/workflows/build.yml                   |  11 +-
 MAINTAINERS                                   |   6 +
 app/test/test_cpuflags.c                      |  81 +++++++++++
 app/test/test_xmmt_ops.h                      |  16 +++
 config/meson.build                            |   2 +
 config/riscv/meson.build                      | 131 ++++++++++++++++++
 config/riscv/riscv64_linux_gcc                |  17 +++
 config/riscv/riscv64_sifive_u740_linux_gcc    |  20 +++
 devtools/test-meson-builds.sh                 |   4 +
 doc/guides/contributing/design.rst            |   2 +-
 .../linux_gsg/cross_build_dpdk_for_riscv.rst  | 115 +++++++++++++++
 doc/guides/linux_gsg/index.rst                |   1 +
 doc/guides/nics/features.rst                  |   5 +
 doc/guides/nics/features/default.ini          |   1 +
 doc/guides/nics/features/ixgbe.ini            |   1 +
 doc/guides/rel_notes/release_22_07.rst        |   8 ++
 drivers/net/i40e/meson.build                  |   6 +
 drivers/net/ixgbe/ixgbe_rxtx.c                |   4 +-
 drivers/net/memif/rte_eth_memif.h             |   2 +
 drivers/net/tap/tap_bpf.h                     |   2 +
 examples/l3fwd/l3fwd_em.c                     |   8 ++
 examples/l3fwd/l3fwd_fib.c                    |   2 +
 lib/eal/riscv/include/meson.build             |  23 +++
 lib/eal/riscv/include/rte_atomic.h            |  52 +++++++
 lib/eal/riscv/include/rte_byteorder.h         |  44 ++++++
 lib/eal/riscv/include/rte_cpuflags.h          |  55 ++++++++
 lib/eal/riscv/include/rte_cycles.h            | 101 ++++++++++++++
 lib/eal/riscv/include/rte_io.h                |  21 +++
 lib/eal/riscv/include/rte_mcslock.h           |  18 +++
 lib/eal/riscv/include/rte_memcpy.h            |  63 +++++++++
 lib/eal/riscv/include/rte_pause.h             |  31 +++++
 lib/eal/riscv/include/rte_pflock.h            |  17 +++
 lib/eal/riscv/include/rte_power_intrinsics.h  |  22 +++
 lib/eal/riscv/include/rte_prefetch.h          |  50 +++++++
 lib/eal/riscv/include/rte_rwlock.h            |  44 ++++++
 lib/eal/riscv/include/rte_spinlock.h          |  67 +++++++++
 lib/eal/riscv/include/rte_ticketlock.h        |  21 +++
 lib/eal/riscv/include/rte_vect.h              |  55 ++++++++
 lib/eal/riscv/meson.build                     |  11 ++
 lib/eal/riscv/rte_cpuflags.c                  | 122 ++++++++++++++++
 lib/eal/riscv/rte_cycles.c                    |  77 ++++++++++
 lib/eal/riscv/rte_hypervisor.c                |  13 ++
 lib/eal/riscv/rte_power_intrinsics.c          |  56 ++++++++
 meson.build                                   |   2 +
 45 files changed, 1410 insertions(+), 4 deletions(-)
 create mode 100644 config/riscv/meson.build
 create mode 100644 config/riscv/riscv64_linux_gcc
 create mode 100644 config/riscv/riscv64_sifive_u740_linux_gcc
 create mode 100644 doc/guides/linux_gsg/cross_build_dpdk_for_riscv.rst
 create mode 100644 lib/eal/riscv/include/meson.build
 create mode 100644 lib/eal/riscv/include/rte_atomic.h
 create mode 100644 lib/eal/riscv/include/rte_byteorder.h
 create mode 100644 lib/eal/riscv/include/rte_cpuflags.h
 create mode 100644 lib/eal/riscv/include/rte_cycles.h
 create mode 100644 lib/eal/riscv/include/rte_io.h
 create mode 100644 lib/eal/riscv/include/rte_mcslock.h
 create mode 100644 lib/eal/riscv/include/rte_memcpy.h
 create mode 100644 lib/eal/riscv/include/rte_pause.h
 create mode 100644 lib/eal/riscv/include/rte_pflock.h
 create mode 100644 lib/eal/riscv/include/rte_power_intrinsics.h
 create mode 100644 lib/eal/riscv/include/rte_prefetch.h
 create mode 100644 lib/eal/riscv/include/rte_rwlock.h
 create mode 100644 lib/eal/riscv/include/rte_spinlock.h
 create mode 100644 lib/eal/riscv/include/rte_ticketlock.h
 create mode 100644 lib/eal/riscv/include/rte_vect.h
 create mode 100644 lib/eal/riscv/meson.build
 create mode 100644 lib/eal/riscv/rte_cpuflags.c
 create mode 100644 lib/eal/riscv/rte_cycles.c
 create mode 100644 lib/eal/riscv/rte_hypervisor.c
 create mode 100644 lib/eal/riscv/rte_power_intrinsics.c

-- 
2.30.2

[PATCH v4 1/8] eal: add initial support for RISC-V architecture

[Stanislaw Kardach]

From: Michal Mazurek <maz@semihalf.com>

Add all necessary elements for DPDK to compile and run EAL on SiFive
Freedom U740 SoC which is based on SiFive U74-MC (ISA: rv64imafdc)
core complex.

This includes:

- EAL library implementation for rv64imafdc ISA.
- meson build structure for 'riscv' architecture. RTE_ARCH_RISCV define
  is added for architecture identification.
- xmm_t structure operation stubs as there is no vector support in the
  U74 core.

Compilation was tested on Ubuntu and Arch Linux using riscv64 toolchain.
Clang compilation currently not supported due to issues with missing
relocation relaxation.

Two rte_rdtsc() schemes are provided: stable low-resolution using rdtime
(default) and unstable high-resolution using rdcycle. User can override
the scheme by defining RTE_RISCV_RDTSC_USE_HPM=1 during compile time of
both DPDK and the application. The reasoning for this is as follows.
The RISC-V ISA mandates that clock read by rdtime has to be of constant
period and synchronized between all hardware threads within 1 tick
(chapter 10.1 in version 20191213 of RISC-V spec).
However this clock may not be of high-enough frequency for dataplane
uses. I.e. on HiFive Unmatched (FU740) it is 1MHz.
There is a high-resolution alternative in form of rdcycle which is
clocked at the core clock frequency. The drawbacks are that it may be
disabled during sleep (WFI), its frequency might change due to DVFS and
it is core-local and therefore cannot be used as a wall-clock. It can
however be used for micro-benchmarking user applications, similarly to
Aarch64's PMCCNTR PMU counter.

The platform is currently marked as linux-only because rte_cycles
implementation uses the timebase-frequency device-tree node read through
the proc file system. Such approach was chosen because Linux kernel
depends on the presence of this device-tree node.

The i40e PMD driver is disabled on RISC-V as the rv64gc ISA has no vector
operations.

The compilation of following modules has been disabled by this commit
and will be re-enabled in later commits as fixes are introduced:
net/ixgbe, net/memif, net/tap, example/l3fwd.

Known checkpatch errors/warnings:

- ERROR:COMPLEX_MACRO in rte_atomic.h and rte_cycles.h due to inline
  assembly declarations.
- vector_size compiler attribute used in rte_vect.h directly.
- rte_*mb() used directly in rte_atomic.h to reduce code duplication.
- __atomic_thread_fence() used to implement rte_atomic_thread_fence().

Sponsored-by: Frank Zhao <Frank.Zhao@starfivetech.com>
Sponsored-by: Sam Grove <sam.grove@sifive.com>
Signed-off-by: Michal Mazurek <maz@semihalf.com>
Signed-off-by: Stanislaw Kardach <kda@semihalf.com>
---
Depends-on: series-22867 ("test/ring: remove excessive inlining")
Depends-on: series-22868 ("lpm: add a scalar version of lookupx4 function")
Depends-on: series-22869 ("examples/l3fwd: fix scalar LPM compilation")
---
 MAINTAINERS                                   |   6 +
 app/test/test_xmmt_ops.h                      |  16 +++
 config/meson.build                            |   2 +
 config/riscv/meson.build                      | 131 ++++++++++++++++++
 config/riscv/riscv64_linux_gcc                |  17 +++
 config/riscv/riscv64_sifive_u740_linux_gcc    |  20 +++
 doc/guides/contributing/design.rst            |   2 +-
 .../linux_gsg/cross_build_dpdk_for_riscv.rst  | 115 +++++++++++++++
 doc/guides/linux_gsg/index.rst                |   1 +
 doc/guides/nics/features.rst                  |   5 +
 doc/guides/nics/features/default.ini          |   1 +
 doc/guides/rel_notes/known_issues.rst         |  10 +-
 doc/guides/rel_notes/release_22_07.rst        |   8 ++
 drivers/net/i40e/meson.build                  |   6 +
 drivers/net/ixgbe/meson.build                 |   6 +
 drivers/net/memif/meson.build                 |   5 +
 drivers/net/tap/meson.build                   |   5 +
 examples/l3fwd/meson.build                    |   6 +
 lib/eal/riscv/include/meson.build             |  23 +++
 lib/eal/riscv/include/rte_atomic.h            |  52 +++++++
 lib/eal/riscv/include/rte_byteorder.h         |  44 ++++++
 lib/eal/riscv/include/rte_cpuflags.h          |  55 ++++++++
 lib/eal/riscv/include/rte_cycles.h            | 101 ++++++++++++++
 lib/eal/riscv/include/rte_io.h                |  21 +++
 lib/eal/riscv/include/rte_mcslock.h           |  18 +++
 lib/eal/riscv/include/rte_memcpy.h            |  63 +++++++++
 lib/eal/riscv/include/rte_pause.h             |  31 +++++
 lib/eal/riscv/include/rte_pflock.h            |  17 +++
 lib/eal/riscv/include/rte_power_intrinsics.h  |  22 +++
 lib/eal/riscv/include/rte_prefetch.h          |  50 +++++++
 lib/eal/riscv/include/rte_rwlock.h            |  44 ++++++
 lib/eal/riscv/include/rte_spinlock.h          |  67 +++++++++
 lib/eal/riscv/include/rte_ticketlock.h        |  21 +++
 lib/eal/riscv/include/rte_vect.h              |  55 ++++++++
 lib/eal/riscv/meson.build                     |  11 ++
 lib/eal/riscv/rte_cpuflags.c                  | 122 ++++++++++++++++
 lib/eal/riscv/rte_cycles.c                    |  77 ++++++++++
 lib/eal/riscv/rte_hypervisor.c                |  13 ++
 lib/eal/riscv/rte_power_intrinsics.c          |  56 ++++++++
 meson.build                                   |   2 +
 40 files changed, 1323 insertions(+), 4 deletions(-)
 create mode 100644 config/riscv/meson.build
 create mode 100644 config/riscv/riscv64_linux_gcc
 create mode 100644 config/riscv/riscv64_sifive_u740_linux_gcc
 create mode 100644 doc/guides/linux_gsg/cross_build_dpdk_for_riscv.rst
 create mode 100644 lib/eal/riscv/include/meson.build
 create mode 100644 lib/eal/riscv/include/rte_atomic.h
 create mode 100644 lib/eal/riscv/include/rte_byteorder.h
 create mode 100644 lib/eal/riscv/include/rte_cpuflags.h
 create mode 100644 lib/eal/riscv/include/rte_cycles.h
 create mode 100644 lib/eal/riscv/include/rte_io.h
 create mode 100644 lib/eal/riscv/include/rte_mcslock.h
 create mode 100644 lib/eal/riscv/include/rte_memcpy.h
 create mode 100644 lib/eal/riscv/include/rte_pause.h
 create mode 100644 lib/eal/riscv/include/rte_pflock.h
 create mode 100644 lib/eal/riscv/include/rte_power_intrinsics.h
 create mode 100644 lib/eal/riscv/include/rte_prefetch.h
 create mode 100644 lib/eal/riscv/include/rte_rwlock.h
 create mode 100644 lib/eal/riscv/include/rte_spinlock.h
 create mode 100644 lib/eal/riscv/include/rte_ticketlock.h
 create mode 100644 lib/eal/riscv/include/rte_vect.h
 create mode 100644 lib/eal/riscv/meson.build
 create mode 100644 lib/eal/riscv/rte_cpuflags.c
 create mode 100644 lib/eal/riscv/rte_cycles.c
 create mode 100644 lib/eal/riscv/rte_hypervisor.c
 create mode 100644 lib/eal/riscv/rte_power_intrinsics.c

diff --git a/MAINTAINERS b/MAINTAINERS
index 17a0559ee7..8809ceddce 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -297,6 +297,12 @@ F: drivers/*/*/*_altivec.*
 F: app/*/*_altivec.*
 F: examples/*/*_altivec.*
 
+RISC-V
+M: Stanislaw Kardach <kda@semihalf.com>
+F: config/riscv/
+F: doc/guides/linux_gsg/cross_build_dpdk_for_riscv.rst
+F: lib/eal/riscv/
+
 Intel x86
 M: Bruce Richardson <bruce.richardson@intel.com>
 M: Konstantin Ananyev <konstantin.v.ananyev@yandex.ru>
diff --git a/app/test/test_xmmt_ops.h b/app/test/test_xmmt_ops.h
index 3a82d5ecac..55f256599e 100644
--- a/app/test/test_xmmt_ops.h
+++ b/app/test/test_xmmt_ops.h
@@ -1,5 +1,8 @@
 /* SPDX-License-Identifier: BSD-3-Clause
  * Copyright(c) 2015 Cavium, Inc
+ * Copyright(c) 2022 StarFive
+ * Copyright(c) 2022 SiFive
+ * Copyright(c) 2022 Semihalf
  */
 
 #ifndef _TEST_XMMT_OPS_H_
@@ -49,6 +52,19 @@ vect_set_epi32(int i3, int i2, int i1, int i0)
 	return data;
 }
 
+#elif defined(RTE_ARCH_RISCV)
+
+#define vect_loadu_sil128(p) vect_load_128(p)
+
+/* sets the 4 signed 32-bit integer values and returns the xmm_t variable */
+static __rte_always_inline xmm_t
+vect_set_epi32(int i3, int i2, int i1, int i0)
+{
+	xmm_t data = (xmm_t){i0, i1, i2, i3};
+
+	return data;
+}
+
 #endif
 
 #endif /* _TEST_XMMT_OPS_H_ */
diff --git a/config/meson.build b/config/meson.build
index 7134e80e8d..7f7b6c92fd 100644
--- a/config/meson.build
+++ b/config/meson.build
@@ -121,6 +121,8 @@ if cpu_instruction_set == 'generic'
         cpu_instruction_set = 'generic'
     elif host_machine.cpu_family().startswith('ppc')
         cpu_instruction_set = 'power8'
+    elif host_machine.cpu_family().startswith('riscv')
+        cpu_instruction_set = 'riscv'
     endif
 endif
 
diff --git a/config/riscv/meson.build b/config/riscv/meson.build
new file mode 100644
index 0000000000..24f0077775
--- /dev/null
+++ b/config/riscv/meson.build
@@ -0,0 +1,131 @@
+# SPDX-License-Identifier: BSD-3-Clause
+# Copyright(c) 2017 Intel Corporation.
+# Copyright(c) 2017 Cavium, Inc
+# Copyright(c) 2021 PANTHEON.tech s.r.o.
+# Copyright(c) 2022 StarFive
+# Copyright(c) 2022 SiFive
+# Copyright(c) 2022 Semihalf
+
+if not is_linux
+    error('Only Linux is supported at this point in time.')
+endif
+
+if not dpdk_conf.get('RTE_ARCH_64')
+    error('Only 64-bit compiles are supported for this platform type')
+endif
+
+dpdk_conf.set('RTE_ARCH', 'riscv')
+dpdk_conf.set('RTE_ARCH_RISCV', 1)
+dpdk_conf.set('RTE_FORCE_INTRINSICS', 1)
+
+# common flags to all riscv builds, with lowest priority
+flags_common = [
+    ['RTE_ARCH_RISCV', true],
+    ['RTE_CACHE_LINE_SIZE', 64],
+    # Manually set wall time clock frequency for the target. If 0, then it is
+    # read from /proc/device-tree/cpus/timebase-frequency. This property is
+    # guaranteed on Linux, as riscv time_init() requires it.
+    ['RTE_RISCV_TIME_FREQ', 0],
+]
+
+## SoC-specific options.
+# The priority is like this: arch > vendor > common.
+#
+# Note that currently there's no way of getting vendor/microarchitecture id
+# values in userspace which is why the logic of choosing the right flag
+# combination is strictly based on the values passed from a cross-file.
+vendor_generic = {
+    'description': 'Generic RISC-V',
+    'flags': [
+        ['RTE_MACHINE', '"riscv"'],
+        ['RTE_USE_C11_MEM_MODEL', true],
+        ['RTE_MAX_LCORE', 128],
+        ['RTE_MAX_NUMA_NODES', 2]
+    ],
+    'arch_config': {
+        'generic': {'machine_args': ['-march=rv64gc']}
+    }
+}
+
+arch_config_riscv = {
+    '0x8000000000000007': {
+        'machine_args':  ['-march=rv64gc', '-mtune=sifive-7-series'],
+        'flags': []
+    },
+}
+
+vendor_sifive = {
+    'description': 'SiFive',
+    'flags': [
+        ['RTE_MACHINE', '"riscv"'],
+        ['RTE_USE_C11_MEM_MODEL', true],
+        ['RTE_MAX_LCORE', 4],
+        ['RTE_MAX_NUMA_NODES', 1],
+    ],
+    'arch_config': arch_config_riscv
+}
+
+vendors = {
+    'generic': vendor_generic,
+    '0x489': vendor_sifive
+}
+
+# Native/cross vendor/arch detection
+if not meson.is_cross_build()
+    if machine == 'default'
+        # default build
+        vendor_id = 'generic'
+        arch_id = 'generic'
+        message('generic RISC-V')
+    else
+        vendor_id = 'generic'
+        arch_id = 'generic'
+        warning('RISC-V arch discovery not available, using generic!')
+    endif
+else
+    # cross build
+    vendor_id = meson.get_cross_property('vendor_id')
+    arch_id = meson.get_cross_property('arch_id')
+endif
+
+if vendors.has_key(vendor_id)
+    vendor_config = vendors[vendor_id]
+else
+    error('Unsupported RISC-V vendor: @0@. '.format(vendor_id) +
+        'Please add support for it or use the generic ' +
+        '(-Dmachine=generic) build.')
+endif
+
+message('RISC-V vendor: ' + vendor_config['description'])
+message('RISC-V architecture id: ' + arch_id)
+
+arch_config = vendor_config['arch_config']
+if arch_config.has_key(arch_id)
+    # use the specified arch_id machine args if found
+    arch_config = arch_config[arch_id]
+else
+    # unknown micro-architecture id
+    error('Unsupported architecture @0@ of vendor @1@. '
+        .format(arch_id, vendor_id) +
+        'Please add support for it or use the generic ' +
+        '(-Dmachine=generic) build.')
+endif
+
+# Concatenate flags respecting priorities.
+dpdk_flags = flags_common + vendor_config['flags'] + arch_config.get('flags', [])
+
+# apply supported machine args
+machine_args = [] # Clear previous machine args
+foreach flag: arch_config['machine_args']
+    if cc.has_argument(flag)
+        machine_args += flag
+    endif
+endforeach
+
+# apply flags
+foreach flag: dpdk_flags
+    if flag.length() > 0
+        dpdk_conf.set(flag[0], flag[1])
+    endif
+endforeach
+message('Using machine args: @0@'.format(machine_args))
diff --git a/config/riscv/riscv64_linux_gcc b/config/riscv/riscv64_linux_gcc
new file mode 100644
index 0000000000..ed4d3ce7fb
--- /dev/null
+++ b/config/riscv/riscv64_linux_gcc
@@ -0,0 +1,17 @@
+[binaries]
+c = 'riscv64-linux-gnu-gcc'
+cpp = 'riscv64-linux-gnu-g++'
+ar = 'riscv64-linux-gnu-ar'
+strip = 'riscv64-linux-gnu-strip'
+pcap-config = ''
+
+[host_machine]
+system = 'linux'
+cpu_family = 'riscv64'
+cpu = 'rv64gc'
+endian = 'little'
+
+[properties]
+vendor_id = 'generic'
+arch_id = 'generic'
+pkg_config_libdir = '/usr/lib/riscv64-linux-gnu/pkgconfig'
diff --git a/config/riscv/riscv64_sifive_u740_linux_gcc b/config/riscv/riscv64_sifive_u740_linux_gcc
new file mode 100644
index 0000000000..3d1905c434
--- /dev/null
+++ b/config/riscv/riscv64_sifive_u740_linux_gcc
@@ -0,0 +1,20 @@
+[binaries]
+c = 'riscv64-unknown-linux-gnu-gcc'
+cpp = 'riscv64-unknown-linux-gnu-g++'
+ar = 'riscv64-unknown-linux-gnu-ar'
+strip = 'riscv64-unknown-linux-gnu-strip'
+pcap-config = ''
+
+[host_machine]
+system = 'linux'
+cpu_family = 'riscv64'
+cpu = 'rv64gc'
+endian = 'little'
+
+[properties]
+vendor_id = '0x489'
+arch_id = '0x8000000000000007'
+max_lcores = 4
+max_numa_nodes = 1
+pkg_config_libdir = '/usr/lib/riscv64-linux-gnu/pkgconfig'
+sys_root = '/opt/riscv/sysroot'
diff --git a/doc/guides/contributing/design.rst b/doc/guides/contributing/design.rst
index d5ca8b4d9c..0383afe5c8 100644
--- a/doc/guides/contributing/design.rst
+++ b/doc/guides/contributing/design.rst
@@ -42,7 +42,7 @@ Per Architecture Sources
 The following macro options can be used:
 
 * ``RTE_ARCH`` is a string that contains the name of the architecture.
-* ``RTE_ARCH_I686``, ``RTE_ARCH_X86_64``, ``RTE_ARCH_X86_X32``, ``RTE_ARCH_PPC_64``, ``RTE_ARCH_ARM``, ``RTE_ARCH_ARMv7`` or ``RTE_ARCH_ARM64`` are defined only if we are building for those architectures.
+* ``RTE_ARCH_I686``, ``RTE_ARCH_X86_64``, ``RTE_ARCH_X86_X32``, ``RTE_ARCH_PPC_64``, ``RTE_ARCH_RISCV``, ``RTE_ARCH_ARM``, ``RTE_ARCH_ARMv7`` or ``RTE_ARCH_ARM64`` are defined only if we are building for those architectures.
 
 Per Execution Environment Sources
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
diff --git a/doc/guides/linux_gsg/cross_build_dpdk_for_riscv.rst b/doc/guides/linux_gsg/cross_build_dpdk_for_riscv.rst
new file mode 100644
index 0000000000..9e121645a8
--- /dev/null
+++ b/doc/guides/linux_gsg/cross_build_dpdk_for_riscv.rst
@@ -0,0 +1,115 @@
+..  SPDX-License-Identifier: BSD-3-Clause
+    Copyright(c) 2020 ARM Corporation.
+    Copyright(c) 2022 StarFive
+    Copyright(c) 2022 SiFive
+    Copyright(c) 2022 Semihalf
+
+Cross compiling DPDK for RISC-V
+===============================
+
+This chapter describes how to cross compile DPDK for RISC-V from x86 build
+hosts.
+
+.. note::
+
+   While it's possible to compile DPDK natively on a RISC-V host, it is
+   currently recommended to cross-compile as Linux kernel does not offer any
+   way for userspace to discover the vendor and architecture identifiers of the
+   CPU and therefore any per-chip optimization options have to be chosen via
+   a cross-file or ``c_args``.
+
+
+Prerequisites
+-------------
+
+Ensure that you have all pre-requisites for building DPDK natively as those will
+be required also for cross-compilation.
+
+
+Linux kernel
+~~~~~~~~~~~~
+
+Make sure that RISC-V host is running Linux kernel 5.13 or newer. This version
+introduces patches necessary for PCIe BAR mapping to userspace.
+
+
+GNU toolchain
+-------------
+
+Obtain the cross toolchain
+~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+The build process was tested using:
+
+* Ubuntu toolchain (the ``crossbuild-essential-riscv64`` package).
+
+* Latest `RISC-V GNU toolchain
+  <https://github.com/riscv/riscv-gnu-toolchain/releases>`_ on Ubuntu or Arch
+  Linux.
+
+Alternatively the toolchain may be built straight from the source, to do that
+follow the instructions on the riscv-gnu-toolchain github page.
+
+
+Unzip and add into the PATH
+~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+This step is only required for the riscv-gnu-toolchain. The Ubuntu toolchain is
+in the PATH already.
+
+.. code-block:: console
+
+   tar -xvf riscv64-glibc-ubuntu-20.04-<version>.tar.gz
+   export PATH=$PATH:<cross_install_dir>/riscv/bin
+
+
+Cross Compiling DPDK with GNU toolchain using Meson
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+To cross-compile DPDK for a desired target machine use the following command::
+
+   meson cross-build --cross-file <target_machine_configuration>
+   ninja -C cross-build
+
+For example if the target machine is a generic rv64gc RISC-V, use the following
+command::
+
+   meson riscv64-build-gcc --cross-file config/riscv/riscv64_linux_gcc
+   ninja -C riscv64-build-gcc
+
+If riscv-gnu-toolchain is used, binary names should be updated to match. Update
+the following lines in the cross-file:
+
+.. code-block:: console
+
+   [binaries]
+   c = 'riscv64-unknown-linux-gnu-gcc'
+   cpp = 'riscv64-unknown-linux-gnu-g++'
+   ar = 'riscv64-unknown-linux-gnu-ar'
+   strip = 'riscv64-unknown-linux-gnu-strip'
+   ...
+
+Some toolchains (such as freedom-u-sdk one) require also setting ``--sysroot``,
+otherwise include paths might not be resolved. To do so, add the appropriate
+paths to the cross-file:
+
+.. code-block:: console
+
+   [properties]
+   ...
+   sys_root = ['--sysroot', '<path/to/toolchain/sysroot>']
+   ...
+
+
+Supported cross-compilation targets
+-----------------------------------
+
+Currently the following targets are supported:
+
+* Generic rv64gc ISA: ``config/riscv/riscv64_linux_gcc``
+
+* SiFive U740 SoC: ``config/riscv/riscv64_sifive_u740_linux_gcc``
+
+To add a new target support, ``config/riscv/meson.build`` has to be modified by
+adding a new vendor/architecture id and a corresponding cross-file has to be
+added to ``config/riscv`` directory.
diff --git a/doc/guides/linux_gsg/index.rst b/doc/guides/linux_gsg/index.rst
index 16a9a67260..747552c385 100644
--- a/doc/guides/linux_gsg/index.rst
+++ b/doc/guides/linux_gsg/index.rst
@@ -14,6 +14,7 @@ Getting Started Guide for Linux
     sys_reqs
     build_dpdk
     cross_build_dpdk_for_arm64
+    cross_build_dpdk_for_riscv
     linux_drivers
     build_sample_apps
     linux_eal_parameters
diff --git a/doc/guides/nics/features.rst b/doc/guides/nics/features.rst
index 21bedb743f..6c4fa74bc7 100644
--- a/doc/guides/nics/features.rst
+++ b/doc/guides/nics/features.rst
@@ -855,6 +855,11 @@ x86-64
 
 Support 64bits x86 architecture.
 
+rv64
+----
+
+Support 64-bit RISC-V architecture.
+
 
 .. _nic_features_usage_doc:
 
diff --git a/doc/guides/nics/features/default.ini b/doc/guides/nics/features/default.ini
index b1d18ac62c..02198682c6 100644
--- a/doc/guides/nics/features/default.ini
+++ b/doc/guides/nics/features/default.ini
@@ -74,6 +74,7 @@ ARMv8                =
 Power8               =
 x86-32               =
 x86-64               =
+rv64                 =
 Usage doc            =
 Design doc           =
 Perf doc             =
diff --git a/doc/guides/rel_notes/known_issues.rst b/doc/guides/rel_notes/known_issues.rst
index 187d9c942e..613ff7c3df 100644
--- a/doc/guides/rel_notes/known_issues.rst
+++ b/doc/guides/rel_notes/known_issues.rst
@@ -249,11 +249,15 @@ PMD does not work with --no-huge EAL command line parameter
 -----------------------------------------------------------
 
 **Description**:
-   Currently, the DPDK does not store any information about memory allocated by ``malloc()` (for example, NUMA node,
-   physical address), hence PMDs do not work when the ``--no-huge`` command line parameter is supplied to EAL.
+   Currently, the DPDK does not store any information about memory allocated by ``malloc()`` (for example, NUMA node,
+   physical address), hence PMDs do not work when the ``--no-huge`` command line parameter is supplied to EAL. This
+   happens when using non-IOMMU based UIO drivers (i.e. ``igb_uio`` or ``uio_pci_generic``) or when IOVA mode is
+   explicitly set to use physical addresses (via the ``--iova-mode=pa`` EAL parameter).
 
 **Implication**:
-   Sending and receiving data with PMD will not work.
+   Sending and receiving data with PMD will not work. Unit tests checking ``--no-huge`` operation will fail if
+   there is a device bound to the PMD (eal_flags_n_opt_autotest, eal_flags_no_huge_autotest,
+   eal_flags_vdev_opt_autotest, eal_flags_misc_autotest).
 
 **Resolution/Workaround**:
    Use huge page memory or use VFIO to map devices.
diff --git a/doc/guides/rel_notes/release_22_07.rst b/doc/guides/rel_notes/release_22_07.rst
index 0cf3f71269..f2311c5c1e 100644
--- a/doc/guides/rel_notes/release_22_07.rst
+++ b/doc/guides/rel_notes/release_22_07.rst
@@ -60,6 +60,14 @@ New Features
   Added an API which can get the number of in-flight packets in
   vhost async data path without using lock.
 
+* **Added initial RISC-V architecture support.***
+
+  Added EAL implementation for RISC-V architecture. The initial device the
+  porting was tested on is a HiFive Unmatched development board based on the
+  SiFive Freedom U740 SoC. In theory this implementation should work with any
+  ``rv64gc`` ISA compatible implementation with MMU supporting a reasonable
+  address space size (U740 uses sv39 MMU).
+
 * **Updated Intel iavf driver.**
 
   * Added Tx QoS queue rate limitation support.
diff --git a/drivers/net/i40e/meson.build b/drivers/net/i40e/meson.build
index efc5f93e35..a4c1c9079a 100644
--- a/drivers/net/i40e/meson.build
+++ b/drivers/net/i40e/meson.build
@@ -1,6 +1,12 @@
 # SPDX-License-Identifier: BSD-3-Clause
 # Copyright(c) 2017 Intel Corporation
 
+if arch_subdir == 'riscv'
+		build = false
+		reason = 'riscv arch not supported'
+		subdir_done()
+endif
+
 cflags += ['-DPF_DRIVER',
     '-DVF_DRIVER',
     '-DINTEGRATED_VF',
diff --git a/drivers/net/ixgbe/meson.build b/drivers/net/ixgbe/meson.build
index 162f8d5f46..88539e97d5 100644
--- a/drivers/net/ixgbe/meson.build
+++ b/drivers/net/ixgbe/meson.build
@@ -1,6 +1,12 @@
 # SPDX-License-Identifier: BSD-3-Clause
 # Copyright(c) 2017 Intel Corporation
 
+if arch_subdir == 'riscv'
+		build = false
+		reason = 'riscv arch not supported'
+		subdir_done()
+endif
+
 cflags += ['-DRTE_LIBRTE_IXGBE_BYPASS']
 
 subdir('base')
diff --git a/drivers/net/memif/meson.build b/drivers/net/memif/meson.build
index 680bc8631c..9afb495953 100644
--- a/drivers/net/memif/meson.build
+++ b/drivers/net/memif/meson.build
@@ -5,6 +5,11 @@ if not is_linux
     build = false
     reason = 'only supported on Linux'
 endif
+if arch_subdir == 'riscv'
+		build = false
+		reason = 'riscv arch not supported'
+		subdir_done()
+endif
 
 sources = files(
         'memif_socket.c',
diff --git a/drivers/net/tap/meson.build b/drivers/net/tap/meson.build
index c09713a67b..3efac9ac07 100644
--- a/drivers/net/tap/meson.build
+++ b/drivers/net/tap/meson.build
@@ -5,6 +5,11 @@ if not is_linux
     build = false
     reason = 'only supported on Linux'
 endif
+if arch_subdir == 'riscv'
+		build = false
+		reason = 'riscv arch not supported'
+		subdir_done()
+endif
 sources = files(
         'rte_eth_tap.c',
         'tap_bpf_api.c',
diff --git a/examples/l3fwd/meson.build b/examples/l3fwd/meson.build
index 0830b3eb31..75fa19b7fe 100644
--- a/examples/l3fwd/meson.build
+++ b/examples/l3fwd/meson.build
@@ -6,6 +6,12 @@
 # To build this example as a standalone application with an already-installed
 # DPDK instance, use 'make'
 
+if dpdk_conf.has('RTE_ARCH_RISCV')
+		build = false
+		reason = 'riscv arch not supported'
+		subdir_done()
+endif
+
 allow_experimental_apis = true
 deps += ['hash', 'lpm', 'fib', 'eventdev']
 sources = files(
diff --git a/lib/eal/riscv/include/meson.build b/lib/eal/riscv/include/meson.build
new file mode 100644
index 0000000000..7f6e4a5b1e
--- /dev/null
+++ b/lib/eal/riscv/include/meson.build
@@ -0,0 +1,23 @@
+# SPDX-License-Identifier: BSD-3-Clause
+# Copyright(c) 2022 StarFive
+# Copyright(c) 2022 SiFive
+# Copyright(c) 2022 Semihalf
+
+arch_headers = files(
+        'rte_atomic.h',
+        'rte_byteorder.h',
+        'rte_cpuflags.h',
+        'rte_cycles.h',
+        'rte_io.h',
+        'rte_mcslock.h',
+        'rte_memcpy.h',
+        'rte_pause.h',
+        'rte_pflock.h',
+        'rte_power_intrinsics.h',
+        'rte_prefetch.h',
+        'rte_rwlock.h',
+        'rte_spinlock.h',
+        'rte_ticketlock.h',
+        'rte_vect.h',
+)
+install_headers(arch_headers, subdir: get_option('include_subdir_arch'))
diff --git a/lib/eal/riscv/include/rte_atomic.h b/lib/eal/riscv/include/rte_atomic.h
new file mode 100644
index 0000000000..4b4633c914
--- /dev/null
+++ b/lib/eal/riscv/include/rte_atomic.h
@@ -0,0 +1,52 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2022 StarFive
+ * Copyright(c) 2022 SiFive
+ * Copyright(c) 2022 Semihalf
+ * All rights reserved.
+ */
+
+#ifndef RTE_ATOMIC_RISCV_H
+#define RTE_ATOMIC_RISCV_H
+
+#ifndef RTE_FORCE_INTRINSICS
+#  error Platform must be built with RTE_FORCE_INTRINSICS
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stdint.h>
+#include <rte_common.h>
+#include <rte_config.h>
+#include "generic/rte_atomic.h"
+
+#define rte_mb()	asm volatile("fence rw, rw" : : : "memory")
+
+#define rte_wmb()	asm volatile("fence w, w" : : : "memory")
+
+#define rte_rmb()	asm volatile("fence r, r" : : : "memory")
+
+#define rte_smp_mb()	rte_mb()
+
+#define rte_smp_wmb()	rte_wmb()
+
+#define rte_smp_rmb()	rte_rmb()
+
+#define rte_io_mb()	asm volatile("fence iorw, iorw" : : : "memory")
+
+#define rte_io_wmb()	asm volatile("fence orw, ow" : : : "memory")
+
+#define rte_io_rmb()	asm volatile("fence ir, ir" : : : "memory")
+
+static __rte_always_inline void
+rte_atomic_thread_fence(int memorder)
+{
+	__atomic_thread_fence(memorder);
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* RTE_ATOMIC_RISCV_H */
diff --git a/lib/eal/riscv/include/rte_byteorder.h b/lib/eal/riscv/include/rte_byteorder.h
new file mode 100644
index 0000000000..21893505d6
--- /dev/null
+++ b/lib/eal/riscv/include/rte_byteorder.h
@@ -0,0 +1,44 @@
+/*
+ * SPDX-License-Identifier: BSD-3-Clause
+ * Inspired from FreeBSD src/sys/powerpc/include/endian.h
+ * Copyright(c) 1987, 1991, 1993
+ * The Regents of the University of California.  All rights reserved.
+ */
+
+#ifndef RTE_BYTEORDER_RISCV_H
+#define RTE_BYTEORDER_RISCV_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stdint.h>
+#include <rte_common.h>
+#include "generic/rte_byteorder.h"
+
+#ifndef RTE_BYTE_ORDER
+#define RTE_BYTE_ORDER RTE_LITTLE_ENDIAN
+#endif
+
+#define rte_cpu_to_le_16(x) (x)
+#define rte_cpu_to_le_32(x) (x)
+#define rte_cpu_to_le_64(x) (x)
+
+#define rte_cpu_to_be_16(x) rte_bswap16(x)
+#define rte_cpu_to_be_32(x) rte_bswap32(x)
+#define rte_cpu_to_be_64(x) rte_bswap64(x)
+
+#define rte_le_to_cpu_16(x) (x)
+#define rte_le_to_cpu_32(x) (x)
+#define rte_le_to_cpu_64(x) (x)
+
+#define rte_be_to_cpu_16(x) rte_bswap16(x)
+#define rte_be_to_cpu_32(x) rte_bswap32(x)
+#define rte_be_to_cpu_64(x) rte_bswap64(x)
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* RTE_BYTEORDER_RISCV_H */
diff --git a/lib/eal/riscv/include/rte_cpuflags.h b/lib/eal/riscv/include/rte_cpuflags.h
new file mode 100644
index 0000000000..66e787f898
--- /dev/null
+++ b/lib/eal/riscv/include/rte_cpuflags.h
@@ -0,0 +1,55 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2014 IBM Corporation
+ * Copyright(c) 2022 StarFive
+ * Copyright(c) 2022 SiFive
+ * Copyright(c) 2022 Semihalf
+ */
+
+#ifndef RTE_CPUFLAGS_RISCV_H
+#define RTE_CPUFLAGS_RISCV_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * Enumeration of all CPU features supported
+ */
+enum rte_cpu_flag_t {
+	RTE_CPUFLAG_RISCV_ISA_A, /* Atomic */
+	RTE_CPUFLAG_RISCV_ISA_B, /* Bit-Manipulation */
+	RTE_CPUFLAG_RISCV_ISA_C, /* Compressed instruction */
+	RTE_CPUFLAG_RISCV_ISA_D, /* Double precision floating-point  */
+	RTE_CPUFLAG_RISCV_ISA_E, /* RV32E ISA */
+	RTE_CPUFLAG_RISCV_ISA_F, /* Single precision floating-point */
+	RTE_CPUFLAG_RISCV_ISA_G, /* Extension pack (IMAFD, Zicsr, Zifencei) */
+	RTE_CPUFLAG_RISCV_ISA_H, /* Hypervisor */
+	RTE_CPUFLAG_RISCV_ISA_I, /* RV32I/RV64I/IRV128I base ISA */
+	RTE_CPUFLAG_RISCV_ISA_J, /* Dynamic Translation Language */
+	RTE_CPUFLAG_RISCV_ISA_K, /* Reserved */
+	RTE_CPUFLAG_RISCV_ISA_L, /* Decimal Floating-Point */
+	RTE_CPUFLAG_RISCV_ISA_M, /* Integer Multiply/Divide */
+	RTE_CPUFLAG_RISCV_ISA_N, /* User-level interrupts */
+	RTE_CPUFLAG_RISCV_ISA_O, /* Reserved */
+	RTE_CPUFLAG_RISCV_ISA_P, /* Packed-SIMD */
+	RTE_CPUFLAG_RISCV_ISA_Q, /* Quad-precision floating-points */
+	RTE_CPUFLAG_RISCV_ISA_R, /* Reserved */
+	RTE_CPUFLAG_RISCV_ISA_S, /* Supervisor mode */
+	RTE_CPUFLAG_RISCV_ISA_T, /* Transactional memory */
+	RTE_CPUFLAG_RISCV_ISA_U, /* User mode */
+	RTE_CPUFLAG_RISCV_ISA_V, /* Vector */
+	RTE_CPUFLAG_RISCV_ISA_W, /* Reserved */
+	RTE_CPUFLAG_RISCV_ISA_X, /* Non-standard extension present */
+	RTE_CPUFLAG_RISCV_ISA_Y, /* Reserved */
+	RTE_CPUFLAG_RISCV_ISA_Z, /* Reserved */
+	/* The last item */
+	RTE_CPUFLAG_NUMFLAGS,/**< This should always be the last! */
+};
+
+#include "generic/rte_cpuflags.h"
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* RTE_CPUFLAGS_RISCV_H */
diff --git a/lib/eal/riscv/include/rte_cycles.h b/lib/eal/riscv/include/rte_cycles.h
new file mode 100644
index 0000000000..04750ca253
--- /dev/null
+++ b/lib/eal/riscv/include/rte_cycles.h
@@ -0,0 +1,101 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2015 Cavium, Inc
+ * Copyright(c) 2022 StarFive
+ * Copyright(c) 2022 SiFive
+ * Copyright(c) 2022 Semihalf
+ */
+
+#ifndef RTE_CYCLES_RISCV_H
+#define RTE_CYCLES_RISCV_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "generic/rte_cycles.h"
+
+#ifndef RTE_RISCV_RDTSC_USE_HPM
+#define RTE_RISCV_RDTSC_USE_HPM 0
+#endif
+
+/** Read wall time counter */
+static __rte_always_inline uint64_t
+__rte_riscv_rdtime(void)
+{
+	uint64_t tsc;
+	asm volatile("csrr %0, time" : "=r" (tsc) : : "memory");
+	return tsc;
+}
+
+/** Read wall time counter ensuring no re-ordering */
+static __rte_always_inline uint64_t
+__rte_riscv_rdtime_precise(void)
+{
+	asm volatile("fence" : : : "memory");
+	return __rte_riscv_rdtime();
+}
+
+/** Read hart cycle counter */
+static __rte_always_inline uint64_t
+__rte_riscv_rdcycle(void)
+{
+	uint64_t tsc;
+	asm volatile("csrr %0, cycle" : "=r" (tsc) : : "memory");
+	return tsc;
+}
+
+/** Read hart cycle counter ensuring no re-ordering */
+static __rte_always_inline uint64_t
+__rte_riscv_rdcycle_precise(void)
+{
+	asm volatile("fence" : : : "memory");
+	return __rte_riscv_rdcycle();
+}
+
+/**
+ * Read the time base register.
+ *
+ * @return
+ *   The time base for this lcore.
+ */
+static __rte_always_inline uint64_t
+rte_rdtsc(void)
+{
+	/**
+	 * By default TIME userspace counter is used. It is stable and shared
+	 * across cores. Although it's frequency may not be enough for all
+	 * applications.
+	 */
+	if (!RTE_RISCV_RDTSC_USE_HPM)
+		return __rte_riscv_rdtime();
+	/**
+	 * Alternatively HPM's CYCLE counter may be used. However this counter
+	 * is not guaranteed by ISA to either be stable frequency or always
+	 * enabled for userspace access (it may trap to kernel or firmware,
+	 * though as of Linux kernel 5.13 it doesn't).
+	 * It is also highly probable that values of this counter are not
+	 * synchronized across cores. Therefore if it is to be used as a timer,
+	 * it can only be used in the scope of a single core.
+	 */
+	return __rte_riscv_rdcycle();
+}
+
+static inline uint64_t
+rte_rdtsc_precise(void)
+{
+	if (!RTE_RISCV_RDTSC_USE_HPM)
+		return __rte_riscv_rdtime_precise();
+	return __rte_riscv_rdcycle_precise();
+}
+
+static __rte_always_inline uint64_t
+rte_get_tsc_cycles(void)
+{
+	return rte_rdtsc();
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* RTE_CYCLES_RISCV_H */
diff --git a/lib/eal/riscv/include/rte_io.h b/lib/eal/riscv/include/rte_io.h
new file mode 100644
index 0000000000..29659c9590
--- /dev/null
+++ b/lib/eal/riscv/include/rte_io.h
@@ -0,0 +1,21 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2016 Cavium, Inc
+ * Copyright(c) 2022 StarFive
+ * Copyright(c) 2022 SiFive
+ * Copyright(c) 2022 Semihalf
+ */
+
+#ifndef RTE_IO_RISCV_H
+#define RTE_IO_RISCV_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "generic/rte_io.h"
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* RTE_IO_RISCV_H */
diff --git a/lib/eal/riscv/include/rte_mcslock.h b/lib/eal/riscv/include/rte_mcslock.h
new file mode 100644
index 0000000000..b517cd5fc5
--- /dev/null
+++ b/lib/eal/riscv/include/rte_mcslock.h
@@ -0,0 +1,18 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2019 Arm Limited
+ */
+
+#ifndef RTE_MCSLOCK_RISCV_H
+#define RTE_MCSLOCK_RISCV_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "generic/rte_mcslock.h"
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* RTE_MCSLOCK_RISCV_H */
diff --git a/lib/eal/riscv/include/rte_memcpy.h b/lib/eal/riscv/include/rte_memcpy.h
new file mode 100644
index 0000000000..e34f19396e
--- /dev/null
+++ b/lib/eal/riscv/include/rte_memcpy.h
@@ -0,0 +1,63 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2022 StarFive
+ * Copyright(c) 2022 SiFive
+ * Copyright(c) 2022 Semihalf
+ */
+
+#ifndef RTE_MEMCPY_RISCV_H
+#define RTE_MEMCPY_RISCV_H
+
+#include <stdint.h>
+#include <string.h>
+
+#include "rte_common.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "generic/rte_memcpy.h"
+
+static inline void
+rte_mov16(uint8_t *dst, const uint8_t *src)
+{
+	memcpy(dst, src, 16);
+}
+
+static inline void
+rte_mov32(uint8_t *dst, const uint8_t *src)
+{
+	memcpy(dst, src, 32);
+}
+
+static inline void
+rte_mov48(uint8_t *dst, const uint8_t *src)
+{
+	memcpy(dst, src, 48);
+}
+
+static inline void
+rte_mov64(uint8_t *dst, const uint8_t *src)
+{
+	memcpy(dst, src, 64);
+}
+
+static inline void
+rte_mov128(uint8_t *dst, const uint8_t *src)
+{
+	memcpy(dst, src, 128);
+}
+
+static inline void
+rte_mov256(uint8_t *dst, const uint8_t *src)
+{
+	memcpy(dst, src, 256);
+}
+
+#define rte_memcpy(d, s, n)	memcpy((d), (s), (n))
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* RTE_MEMCPY_RISCV_H */
diff --git a/lib/eal/riscv/include/rte_pause.h b/lib/eal/riscv/include/rte_pause.h
new file mode 100644
index 0000000000..c24c1f32e8
--- /dev/null
+++ b/lib/eal/riscv/include/rte_pause.h
@@ -0,0 +1,31 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2022 StarFive
+ * Copyright(c) 2022 SiFive
+ * Copyright(c) 2022 Semihalf
+ */
+
+#ifndef RTE_PAUSE_RISCV_H
+#define RTE_PAUSE_RISCV_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "rte_atomic.h"
+
+#include "generic/rte_pause.h"
+
+static inline void rte_pause(void)
+{
+	/* Insert pause hint directly to be compatible with old compilers.
+	 * This will work even on platforms without Zihintpause extension
+	 * because this is a FENCE hint instruction which evaluates to NOP then.
+	 */
+	asm volatile(".int 0x0100000F"::: "memory");
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* RTE_PAUSE_RISCV_H */
diff --git a/lib/eal/riscv/include/rte_pflock.h b/lib/eal/riscv/include/rte_pflock.h
new file mode 100644
index 0000000000..ce6ca02aca
--- /dev/null
+++ b/lib/eal/riscv/include/rte_pflock.h
@@ -0,0 +1,17 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2021 Microsoft Corporation
+ */
+#ifndef RTE_PFLOCK_RISCV_H
+#define RTE_PFLOCK_RISCV_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "generic/rte_pflock.h"
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* RTE_PFLOCK_RISCV_H */
diff --git a/lib/eal/riscv/include/rte_power_intrinsics.h b/lib/eal/riscv/include/rte_power_intrinsics.h
new file mode 100644
index 0000000000..636e58e71f
--- /dev/null
+++ b/lib/eal/riscv/include/rte_power_intrinsics.h
@@ -0,0 +1,22 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2022 StarFive
+ * Copyright(c) 2022 SiFive
+ * Copyright(c) 2022 Semihalf
+ */
+
+#ifndef RTE_POWER_INTRINSIC_RISCV_H
+#define RTE_POWER_INTRINSIC_RISCV_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <rte_common.h>
+
+#include "generic/rte_power_intrinsics.h"
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* RTE_POWER_INTRINSIC_RISCV_H */
diff --git a/lib/eal/riscv/include/rte_prefetch.h b/lib/eal/riscv/include/rte_prefetch.h
new file mode 100644
index 0000000000..966d9e2687
--- /dev/null
+++ b/lib/eal/riscv/include/rte_prefetch.h
@@ -0,0 +1,50 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2014 IBM Corporation
+ * Copyright(c) 2022 StarFive
+ * Copyright(c) 2022 SiFive
+ * Copyright(c) 2022 Semihalf
+ */
+
+#ifndef RTE_PREFETCH_RISCV_H
+#define RTE_PREFETCH_RISCV_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <rte_common.h>
+#include "generic/rte_prefetch.h"
+
+static inline void rte_prefetch0(const volatile void *p)
+{
+	RTE_SET_USED(p);
+}
+
+static inline void rte_prefetch1(const volatile void *p)
+{
+	RTE_SET_USED(p);
+}
+
+static inline void rte_prefetch2(const volatile void *p)
+{
+	RTE_SET_USED(p);
+}
+
+static inline void rte_prefetch_non_temporal(const volatile void *p)
+{
+	/* non-temporal version not available, fallback to rte_prefetch0 */
+	rte_prefetch0(p);
+}
+
+__rte_experimental
+static inline void
+rte_cldemote(const volatile void *p)
+{
+	RTE_SET_USED(p);
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* RTE_PREFETCH_RISCV_H */
diff --git a/lib/eal/riscv/include/rte_rwlock.h b/lib/eal/riscv/include/rte_rwlock.h
new file mode 100644
index 0000000000..9cdaf1b0ef
--- /dev/null
+++ b/lib/eal/riscv/include/rte_rwlock.h
@@ -0,0 +1,44 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2022 StarFive
+ * Copyright(c) 2022 SiFive
+ * Copyright(c) 2022 Semihalf
+ */
+
+#ifndef RTE_RWLOCK_RISCV_H
+#define RTE_RWLOCK_RISCV_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "generic/rte_rwlock.h"
+
+static inline void
+rte_rwlock_read_lock_tm(rte_rwlock_t *rwl)
+{
+	rte_rwlock_read_lock(rwl);
+}
+
+static inline void
+rte_rwlock_read_unlock_tm(rte_rwlock_t *rwl)
+{
+	rte_rwlock_read_unlock(rwl);
+}
+
+static inline void
+rte_rwlock_write_lock_tm(rte_rwlock_t *rwl)
+{
+	rte_rwlock_write_lock(rwl);
+}
+
+static inline void
+rte_rwlock_write_unlock_tm(rte_rwlock_t *rwl)
+{
+	rte_rwlock_write_unlock(rwl);
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* RTE_RWLOCK_RISCV_H */
diff --git a/lib/eal/riscv/include/rte_spinlock.h b/lib/eal/riscv/include/rte_spinlock.h
new file mode 100644
index 0000000000..6af430735c
--- /dev/null
+++ b/lib/eal/riscv/include/rte_spinlock.h
@@ -0,0 +1,67 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2015 RehiveTech. All rights reserved.
+ * Copyright(c) 2022 StarFive
+ * Copyright(c) 2022 SiFive
+ * Copyright(c) 2022 Semihalf
+ */
+
+#ifndef RTE_SPINLOCK_RISCV_H
+#define RTE_SPINLOCK_RISCV_H
+
+#ifndef RTE_FORCE_INTRINSICS
+#  error Platform must be built with RTE_FORCE_INTRINSICS
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <rte_common.h>
+#include "generic/rte_spinlock.h"
+
+static inline int rte_tm_supported(void)
+{
+	return 0;
+}
+
+static inline void
+rte_spinlock_lock_tm(rte_spinlock_t *sl)
+{
+	rte_spinlock_lock(sl); /* fall-back */
+}
+
+static inline int
+rte_spinlock_trylock_tm(rte_spinlock_t *sl)
+{
+	return rte_spinlock_trylock(sl);
+}
+
+static inline void
+rte_spinlock_unlock_tm(rte_spinlock_t *sl)
+{
+	rte_spinlock_unlock(sl);
+}
+
+static inline void
+rte_spinlock_recursive_lock_tm(rte_spinlock_recursive_t *slr)
+{
+	rte_spinlock_recursive_lock(slr); /* fall-back */
+}
+
+static inline void
+rte_spinlock_recursive_unlock_tm(rte_spinlock_recursive_t *slr)
+{
+	rte_spinlock_recursive_unlock(slr);
+}
+
+static inline int
+rte_spinlock_recursive_trylock_tm(rte_spinlock_recursive_t *slr)
+{
+	return rte_spinlock_recursive_trylock(slr);
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* RTE_SPINLOCK_RISCV_H */
diff --git a/lib/eal/riscv/include/rte_ticketlock.h b/lib/eal/riscv/include/rte_ticketlock.h
new file mode 100644
index 0000000000..b8d2a4f937
--- /dev/null
+++ b/lib/eal/riscv/include/rte_ticketlock.h
@@ -0,0 +1,21 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2019 Arm Limited
+ * Copyright(c) 2022 StarFive
+ * Copyright(c) 2022 SiFive
+ * Copyright(c) 2022 Semihalf
+ */
+
+#ifndef RTE_TICKETLOCK_RISCV_H
+#define RTE_TICKETLOCK_RISCV_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "generic/rte_ticketlock.h"
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* RTE_TICKETLOCK_RISCV_H */
diff --git a/lib/eal/riscv/include/rte_vect.h b/lib/eal/riscv/include/rte_vect.h
new file mode 100644
index 0000000000..4600521c20
--- /dev/null
+++ b/lib/eal/riscv/include/rte_vect.h
@@ -0,0 +1,55 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2022 StarFive
+ * Copyright(c) 2022 SiFive
+ * Copyright(c) 2022 Semihalf
+ */
+
+#ifndef RTE_VECT_RISCV_H
+#define RTE_VECT_RISCV_H
+
+#include <stdint.h>
+#include "generic/rte_vect.h"
+#include "rte_common.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define RTE_VECT_DEFAULT_SIMD_BITWIDTH RTE_VECT_SIMD_DISABLED
+
+typedef int32_t		xmm_t __attribute__((vector_size(16)));
+
+#define XMM_SIZE	(sizeof(xmm_t))
+#define XMM_MASK	(XMM_SIZE - 1)
+
+typedef union rte_xmm {
+	xmm_t		x;
+	uint8_t		u8[XMM_SIZE / sizeof(uint8_t)];
+	uint16_t	u16[XMM_SIZE / sizeof(uint16_t)];
+	uint32_t	u32[XMM_SIZE / sizeof(uint32_t)];
+	uint64_t	u64[XMM_SIZE / sizeof(uint64_t)];
+	double		pd[XMM_SIZE / sizeof(double)];
+} __rte_aligned(8) rte_xmm_t;
+
+static inline xmm_t
+vect_load_128(void *p)
+{
+	xmm_t ret = *((xmm_t *)p);
+	return ret;
+}
+
+static inline xmm_t
+vect_and(xmm_t data, xmm_t mask)
+{
+	rte_xmm_t ret = (rte_xmm_t)data;
+	rte_xmm_t m = (rte_xmm_t)mask;
+	ret.u64[0] &= m.u64[0];
+	ret.u64[1] &= m.u64[1];
+	return ret.x;
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* RTE_VECT_RISCV_H */
diff --git a/lib/eal/riscv/meson.build b/lib/eal/riscv/meson.build
new file mode 100644
index 0000000000..dca1106aae
--- /dev/null
+++ b/lib/eal/riscv/meson.build
@@ -0,0 +1,11 @@
+# SPDX-License-Identifier: BSD-3-Clause
+# Copyright(c) 2017 Intel Corporation.
+
+subdir('include')
+
+sources += files(
+        'rte_cpuflags.c',
+        'rte_cycles.c',
+        'rte_hypervisor.c',
+        'rte_power_intrinsics.c',
+)
diff --git a/lib/eal/riscv/rte_cpuflags.c b/lib/eal/riscv/rte_cpuflags.c
new file mode 100644
index 0000000000..4f6d29b947
--- /dev/null
+++ b/lib/eal/riscv/rte_cpuflags.c
@@ -0,0 +1,122 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2022 StarFive
+ * Copyright(c) 2022 SiFive
+ * Copyright(c) 2022 Semihalf
+ */
+
+#include "rte_cpuflags.h"
+
+#include <elf.h>
+#include <fcntl.h>
+#include <assert.h>
+#include <unistd.h>
+#include <string.h>
+
+#ifndef AT_HWCAP
+#define AT_HWCAP 16
+#endif
+
+#ifndef AT_HWCAP2
+#define AT_HWCAP2 26
+#endif
+
+#ifndef AT_PLATFORM
+#define AT_PLATFORM 15
+#endif
+
+enum cpu_register_t {
+	REG_NONE = 0,
+	REG_HWCAP,
+	REG_HWCAP2,
+	REG_PLATFORM,
+	REG_MAX
+};
+
+typedef uint32_t hwcap_registers_t[REG_MAX];
+
+/**
+ * Struct to hold a processor feature entry
+ */
+struct feature_entry {
+	uint32_t reg;
+	uint32_t bit;
+#define CPU_FLAG_NAME_MAX_LEN 64
+	char name[CPU_FLAG_NAME_MAX_LEN];
+};
+
+#define FEAT_DEF(name, reg, bit) \
+	[RTE_CPUFLAG_##name] = {reg, bit, #name},
+
+typedef Elf64_auxv_t _Elfx_auxv_t;
+
+const struct feature_entry rte_cpu_feature_table[] = {
+	FEAT_DEF(RISCV_ISA_A, REG_HWCAP,    0)
+	FEAT_DEF(RISCV_ISA_B, REG_HWCAP,    1)
+	FEAT_DEF(RISCV_ISA_C, REG_HWCAP,    2)
+	FEAT_DEF(RISCV_ISA_D, REG_HWCAP,    3)
+	FEAT_DEF(RISCV_ISA_E, REG_HWCAP,    4)
+	FEAT_DEF(RISCV_ISA_F, REG_HWCAP,    5)
+	FEAT_DEF(RISCV_ISA_G, REG_HWCAP,    6)
+	FEAT_DEF(RISCV_ISA_H, REG_HWCAP,    7)
+	FEAT_DEF(RISCV_ISA_I, REG_HWCAP,    8)
+	FEAT_DEF(RISCV_ISA_J, REG_HWCAP,    9)
+	FEAT_DEF(RISCV_ISA_K, REG_HWCAP,   10)
+	FEAT_DEF(RISCV_ISA_L, REG_HWCAP,   11)
+	FEAT_DEF(RISCV_ISA_M, REG_HWCAP,   12)
+	FEAT_DEF(RISCV_ISA_N, REG_HWCAP,   13)
+	FEAT_DEF(RISCV_ISA_O, REG_HWCAP,   14)
+	FEAT_DEF(RISCV_ISA_P, REG_HWCAP,   15)
+	FEAT_DEF(RISCV_ISA_Q, REG_HWCAP,   16)
+	FEAT_DEF(RISCV_ISA_R, REG_HWCAP,   17)
+	FEAT_DEF(RISCV_ISA_S, REG_HWCAP,   18)
+	FEAT_DEF(RISCV_ISA_T, REG_HWCAP,   19)
+	FEAT_DEF(RISCV_ISA_U, REG_HWCAP,   20)
+	FEAT_DEF(RISCV_ISA_V, REG_HWCAP,   21)
+	FEAT_DEF(RISCV_ISA_W, REG_HWCAP,   22)
+	FEAT_DEF(RISCV_ISA_X, REG_HWCAP,   23)
+	FEAT_DEF(RISCV_ISA_Y, REG_HWCAP,   24)
+	FEAT_DEF(RISCV_ISA_Z, REG_HWCAP,   25)
+};
+/*
+ * Read AUXV software register and get cpu features for ARM
+ */
+static void
+rte_cpu_get_features(hwcap_registers_t out)
+{
+	out[REG_HWCAP] = rte_cpu_getauxval(AT_HWCAP);
+	out[REG_HWCAP2] = rte_cpu_getauxval(AT_HWCAP2);
+}
+
+/*
+ * Checks if a particular flag is available on current machine.
+ */
+int
+rte_cpu_get_flag_enabled(enum rte_cpu_flag_t feature)
+{
+	const struct feature_entry *feat;
+	hwcap_registers_t regs = {0};
+
+	if (feature >= RTE_CPUFLAG_NUMFLAGS)
+		return -ENOENT;
+
+	feat = &rte_cpu_feature_table[feature];
+	if (feat->reg == REG_NONE)
+		return -EFAULT;
+
+	rte_cpu_get_features(regs);
+	return (regs[feat->reg] >> feat->bit) & 1;
+}
+
+const char *
+rte_cpu_get_flag_name(enum rte_cpu_flag_t feature)
+{
+	if (feature >= RTE_CPUFLAG_NUMFLAGS)
+		return NULL;
+	return rte_cpu_feature_table[feature].name;
+}
+
+void
+rte_cpu_get_intrinsics_support(struct rte_cpu_intrinsics *intrinsics)
+{
+	memset(intrinsics, 0, sizeof(*intrinsics));
+}
diff --git a/lib/eal/riscv/rte_cycles.c b/lib/eal/riscv/rte_cycles.c
new file mode 100644
index 0000000000..358f271311
--- /dev/null
+++ b/lib/eal/riscv/rte_cycles.c
@@ -0,0 +1,77 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2015 Cavium, Inc
+ * Copyright(c) 2022 StarFive
+ * Copyright(c) 2022 SiFive
+ * Copyright(c) 2022 Semihalf
+ */
+
+#include <stdio.h>
+
+#include "eal_private.h"
+#include "rte_byteorder.h"
+#include "rte_cycles.h"
+#include "rte_log.h"
+
+/** Read generic counter frequency */
+static uint64_t
+__rte_riscv_timefrq(void)
+{
+#define TIMEBASE_FREQ_SIZE	8
+	if (RTE_RISCV_TIME_FREQ > 0)
+		return RTE_RISCV_TIME_FREQ;
+	uint8_t buf[TIMEBASE_FREQ_SIZE];
+	ssize_t cnt;
+	FILE *file;
+
+	file = fopen("/proc/device-tree/cpus/timebase-frequency", "rb");
+	if (!file)
+		goto fail;
+
+	cnt = fread(buf, 1, TIMEBASE_FREQ_SIZE, file);
+	fclose(file);
+	switch (cnt) {
+	case 8:
+		return rte_be_to_cpu_64(*(uint64_t *)buf);
+	case 4:
+		return rte_be_to_cpu_32(*(uint32_t *)buf);
+	default:
+		break;
+	}
+fail:
+	RTE_LOG(WARNING, EAL, "Unable to read timebase-frequency from FDT.\n");
+	return 0;
+}
+
+uint64_t
+get_tsc_freq_arch(void)
+{
+	RTE_LOG(NOTICE, EAL, "TSC using RISC-V %s.\n",
+		RTE_RISCV_RDTSC_USE_HPM ? "rdcycle" : "rdtime");
+	if (!RTE_RISCV_RDTSC_USE_HPM)
+		return __rte_riscv_timefrq();
+#define CYC_PER_1MHZ 1E6
+	/*
+	 * Use real time clock to estimate current cycle frequency
+	 */
+	uint64_t ticks, frq;
+	uint64_t start_ticks, cur_ticks;
+	uint64_t start_cycle, end_cycle;
+
+	/* Do not proceed unless clock frequency can be obtained. */
+	frq = __rte_riscv_timefrq();
+	if (!frq)
+		return 0;
+
+	/* Number of ticks for 1/10 second */
+	ticks = frq / 10;
+
+	start_ticks = __rte_riscv_rdtime_precise();
+	start_cycle = rte_rdtsc_precise();
+	do {
+		cur_ticks = __rte_riscv_rdtime();
+	} while ((cur_ticks - start_ticks) < ticks);
+	end_cycle = rte_rdtsc_precise();
+
+	/* Adjust the cycles to next 1Mhz */
+	return RTE_ALIGN_MUL_CEIL((end_cycle - start_cycle) * 10, CYC_PER_1MHZ);
+}
diff --git a/lib/eal/riscv/rte_hypervisor.c b/lib/eal/riscv/rte_hypervisor.c
new file mode 100644
index 0000000000..92b5435993
--- /dev/null
+++ b/lib/eal/riscv/rte_hypervisor.c
@@ -0,0 +1,13 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2022 StarFive
+ * Copyright(c) 2022 SiFive
+ * Copyright(c) 2022 Semihalf
+ */
+
+#include "rte_hypervisor.h"
+
+enum rte_hypervisor
+rte_hypervisor_get(void)
+{
+	return RTE_HYPERVISOR_UNKNOWN;
+}
diff --git a/lib/eal/riscv/rte_power_intrinsics.c b/lib/eal/riscv/rte_power_intrinsics.c
new file mode 100644
index 0000000000..240e7b6b87
--- /dev/null
+++ b/lib/eal/riscv/rte_power_intrinsics.c
@@ -0,0 +1,56 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2022 StarFive
+ * Copyright(c) 2022 SiFive
+ * Copyright(c) 2022 Semihalf
+ */
+
+#include "rte_power_intrinsics.h"
+
+/**
+ * This function is not supported on RISC-V 64
+ */
+int
+rte_power_monitor(const struct rte_power_monitor_cond *pmc,
+		  const uint64_t tsc_timestamp)
+{
+	RTE_SET_USED(pmc);
+	RTE_SET_USED(tsc_timestamp);
+
+	return -ENOTSUP;
+}
+
+/**
+ * This function is not supported on RISC-V 64
+ */
+int
+rte_power_pause(const uint64_t tsc_timestamp)
+{
+	RTE_SET_USED(tsc_timestamp);
+
+	return -ENOTSUP;
+}
+
+/**
+ * This function is not supported on RISC-V 64
+ */
+int
+rte_power_monitor_wakeup(const unsigned int lcore_id)
+{
+	RTE_SET_USED(lcore_id);
+
+	return -ENOTSUP;
+}
+
+/**
+ * This function is not supported on RISC-V 64
+ */
+int
+rte_power_monitor_multi(const struct rte_power_monitor_cond pmc[],
+			const uint32_t num, const uint64_t tsc_timestamp)
+{
+	RTE_SET_USED(pmc);
+	RTE_SET_USED(num);
+	RTE_SET_USED(tsc_timestamp);
+
+	return -ENOTSUP;
+}
diff --git a/meson.build b/meson.build
index 937f6110c0..a8db04a1ee 100644
--- a/meson.build
+++ b/meson.build
@@ -50,6 +50,8 @@ elif host_machine.cpu_family().startswith('arm') or host_machine.cpu_family().st
     arch_subdir = 'arm'
 elif host_machine.cpu_family().startswith('ppc')
     arch_subdir = 'ppc'
+elif host_machine.cpu_family().startswith('riscv')
+    arch_subdir = 'riscv'
 endif
 
 # configure the build, and make sure configs here and in config folder are
-- 
2.30.2

[PATCH v4 2/8] net/ixgbe: enable vector stubs for RISC-V

[Stanislaw Kardach]

Re-use vector processing stubs in ixgbe PMD defined for PPC for RISC-V.
This enables ixgbe PMD usage in scalar mode on this architecture.

The ixgbe PMD driver was validated with Intel X520-DA2 NIC and the
test-pmd application. Packet transfer checked using all UIO drivers
available for non-IOMMU platforms: uio_pci_generic, vfio-pci noiommu and
igb_uio.

Sponsored-by: Frank Zhao <Frank.Zhao@starfivetech.com>
Sponsored-by: Sam Grove <sam.grove@sifive.com>
Signed-off-by: Stanislaw Kardach <kda@semihalf.com>
---
 doc/guides/nics/features/ixgbe.ini | 1 +
 drivers/net/ixgbe/ixgbe_rxtx.c     | 4 ++--
 drivers/net/ixgbe/meson.build      | 6 ------
 3 files changed, 3 insertions(+), 8 deletions(-)

diff --git a/doc/guides/nics/features/ixgbe.ini b/doc/guides/nics/features/ixgbe.ini
index c5333d1142..b776ca1cf1 100644
--- a/doc/guides/nics/features/ixgbe.ini
+++ b/doc/guides/nics/features/ixgbe.ini
@@ -54,6 +54,7 @@ Windows              = Y
 ARMv8                = Y
 x86-32               = Y
 x86-64               = Y
+rv64                 = Y
 
 [rte_flow items]
 eth                  = Y
diff --git a/drivers/net/ixgbe/ixgbe_rxtx.c b/drivers/net/ixgbe/ixgbe_rxtx.c
index 9e8ea366a5..009d9b624a 100644
--- a/drivers/net/ixgbe/ixgbe_rxtx.c
+++ b/drivers/net/ixgbe/ixgbe_rxtx.c
@@ -5957,8 +5957,8 @@ ixgbe_config_rss_filter(struct rte_eth_dev *dev,
 	return 0;
 }
 
-/* Stubs needed for linkage when RTE_ARCH_PPC_64 is set */
-#if defined(RTE_ARCH_PPC_64)
+/* Stubs needed for linkage when RTE_ARCH_PPC_64 or RTE_ARCH_RISCV is set */
+#if defined(RTE_ARCH_PPC_64) || defined(RTE_ARCH_RISCV)
 int
 ixgbe_rx_vec_dev_conf_condition_check(struct rte_eth_dev __rte_unused *dev)
 {
diff --git a/drivers/net/ixgbe/meson.build b/drivers/net/ixgbe/meson.build
index 88539e97d5..162f8d5f46 100644
--- a/drivers/net/ixgbe/meson.build
+++ b/drivers/net/ixgbe/meson.build
@@ -1,12 +1,6 @@
 # SPDX-License-Identifier: BSD-3-Clause
 # Copyright(c) 2017 Intel Corporation
 
-if arch_subdir == 'riscv'
-		build = false
-		reason = 'riscv arch not supported'
-		subdir_done()
-endif
-
 cflags += ['-DRTE_LIBRTE_IXGBE_BYPASS']
 
 subdir('base')
-- 
2.30.2

[PATCH v4 3/8] net/memif: set memfd syscall ID on RISC-V

[Stanislaw Kardach]

Define the missing __NR_memfd_create syscall id to enable the memif PMD.

Sponsored-by: Frank Zhao <Frank.Zhao@starfivetech.com>
Sponsored-by: Sam Grove <sam.grove@sifive.com>
Signed-off-by: Stanislaw Kardach <kda@semihalf.com>
---
 drivers/net/memif/meson.build     | 5 -----
 drivers/net/memif/rte_eth_memif.h | 2 ++
 2 files changed, 2 insertions(+), 5 deletions(-)

diff --git a/drivers/net/memif/meson.build b/drivers/net/memif/meson.build
index 9afb495953..680bc8631c 100644
--- a/drivers/net/memif/meson.build
+++ b/drivers/net/memif/meson.build
@@ -5,11 +5,6 @@ if not is_linux
     build = false
     reason = 'only supported on Linux'
 endif
-if arch_subdir == 'riscv'
-		build = false
-		reason = 'riscv arch not supported'
-		subdir_done()
-endif
 
 sources = files(
         'memif_socket.c',
diff --git a/drivers/net/memif/rte_eth_memif.h b/drivers/net/memif/rte_eth_memif.h
index a5ee23d42e..81e7dceae0 100644
--- a/drivers/net/memif/rte_eth_memif.h
+++ b/drivers/net/memif/rte_eth_memif.h
@@ -180,6 +180,8 @@ const char *memif_version(void);
 #define __NR_memfd_create 360
 #elif defined __i386__
 #define __NR_memfd_create 356
+#elif defined __riscv
+#define __NR_memfd_create 279
 #else
 #error "__NR_memfd_create unknown for this architecture"
 #endif
-- 
2.30.2

[PATCH v4 4/8] net/tap: set BPF syscall ID for RISC-V

[Stanislaw Kardach]

Define the missing __NR_bpf syscall id to enable the tap PMD.

Sponsored-by: Frank Zhao <Frank.Zhao@starfivetech.com>
Sponsored-by: Sam Grove <sam.grove@sifive.com>
Signed-off-by: Stanislaw Kardach <kda@semihalf.com>
---
 drivers/net/tap/meson.build | 5 -----
 drivers/net/tap/tap_bpf.h   | 2 ++
 2 files changed, 2 insertions(+), 5 deletions(-)

diff --git a/drivers/net/tap/meson.build b/drivers/net/tap/meson.build
index 3efac9ac07..c09713a67b 100644
--- a/drivers/net/tap/meson.build
+++ b/drivers/net/tap/meson.build
@@ -5,11 +5,6 @@ if not is_linux
     build = false
     reason = 'only supported on Linux'
 endif
-if arch_subdir == 'riscv'
-		build = false
-		reason = 'riscv arch not supported'
-		subdir_done()
-endif
 sources = files(
         'rte_eth_tap.c',
         'tap_bpf_api.c',
diff --git a/drivers/net/tap/tap_bpf.h b/drivers/net/tap/tap_bpf.h
index f0b9fc7a2c..639bdf3a79 100644
--- a/drivers/net/tap/tap_bpf.h
+++ b/drivers/net/tap/tap_bpf.h
@@ -101,6 +101,8 @@ union bpf_attr {
 #  define __NR_bpf 351
 # elif defined(__powerpc__)
 #  define __NR_bpf 361
+# elif defined(__riscv)
+#  define __NR_bpf 280
 # else
 #  error __NR_bpf not defined
 # endif
-- 
2.30.2

[PATCH v4 5/8] examples/l3fwd: enable RISC-V operation

[Stanislaw Kardach]

Add missing em_mask_key() implementation and fix l3fwd_common.h
inclusion in FIB lookup functions to enable the l3fwd to be run on
RISC-V.

Sponsored-by: Frank Zhao <Frank.Zhao@starfivetech.com>
Sponsored-by: Sam Grove <sam.grove@sifive.com>
Signed-off-by: Stanislaw Kardach <kda@semihalf.com>
---
 examples/l3fwd/l3fwd_em.c  | 8 ++++++++
 examples/l3fwd/l3fwd_fib.c | 2 ++
 examples/l3fwd/meson.build | 6 ------
 3 files changed, 10 insertions(+), 6 deletions(-)

diff --git a/examples/l3fwd/l3fwd_em.c b/examples/l3fwd/l3fwd_em.c
index 6f8d94f120..10be24c61d 100644
--- a/examples/l3fwd/l3fwd_em.c
+++ b/examples/l3fwd/l3fwd_em.c
@@ -239,6 +239,14 @@ em_mask_key(void *key, xmm_t mask)
 
 	return vec_and(data, mask);
 }
+#elif defined(RTE_ARCH_RISCV)
+static inline xmm_t
+em_mask_key(void *key, xmm_t mask)
+{
+	xmm_t data = vect_load_128(key);
+
+	return vect_and(data, mask);
+}
 #else
 #error No vector engine (SSE, NEON, ALTIVEC) available, check your toolchain
 #endif
diff --git a/examples/l3fwd/l3fwd_fib.c b/examples/l3fwd/l3fwd_fib.c
index 26d0767ae2..e02e4b3f5a 100644
--- a/examples/l3fwd/l3fwd_fib.c
+++ b/examples/l3fwd/l3fwd_fib.c
@@ -18,6 +18,8 @@
 #include "l3fwd_neon.h"
 #elif defined RTE_ARCH_PPC_64
 #include "l3fwd_altivec.h"
+#else
+#include "l3fwd_common.h"
 #endif
 #include "l3fwd_event.h"
 #include "l3fwd_route.h"
diff --git a/examples/l3fwd/meson.build b/examples/l3fwd/meson.build
index 75fa19b7fe..0830b3eb31 100644
--- a/examples/l3fwd/meson.build
+++ b/examples/l3fwd/meson.build
@@ -6,12 +6,6 @@
 # To build this example as a standalone application with an already-installed
 # DPDK instance, use 'make'
 
-if dpdk_conf.has('RTE_ARCH_RISCV')
-		build = false
-		reason = 'riscv arch not supported'
-		subdir_done()
-endif
-
 allow_experimental_apis = true
 deps += ['hash', 'lpm', 'fib', 'eventdev']
 sources = files(
-- 
2.30.2

[PATCH v4 6/8] test/cpuflags: add test for RISC-V cpu flag

[Stanislaw Kardach]

From: Michal Mazurek <maz@semihalf.com>

Add checks for all flag values defined in the RISC-V misa CSR register.

Sponsored-by: Frank Zhao <Frank.Zhao@starfivetech.com>
Sponsored-by: Sam Grove <sam.grove@sifive.com>
Signed-off-by: Michal Mazurek <maz@semihalf.com>
Signed-off-by: Stanislaw Kardach <kda@semihalf.com>
---
 app/test/test_cpuflags.c | 81 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 81 insertions(+)

diff --git a/app/test/test_cpuflags.c b/app/test/test_cpuflags.c
index 40f6ac7fca..98a99c2c7d 100644
--- a/app/test/test_cpuflags.c
+++ b/app/test/test_cpuflags.c
@@ -200,6 +200,87 @@ test_cpuflags(void)
 	CHECK_FOR_FLAG(RTE_CPUFLAG_INVTSC);
 #endif
 
+#if defined(RTE_ARCH_RISCV)
+
+	printf("Check for RISCV_ISA_A:\t");
+	CHECK_FOR_FLAG(RTE_CPUFLAG_RISCV_ISA_A);
+
+	printf("Check for RISCV_ISA_B:\t");
+	CHECK_FOR_FLAG(RTE_CPUFLAG_RISCV_ISA_B);
+
+	printf("Check for RISCV_ISA_C:\t");
+	CHECK_FOR_FLAG(RTE_CPUFLAG_RISCV_ISA_C);
+
+	printf("Check for RISCV_ISA_D:\t");
+	CHECK_FOR_FLAG(RTE_CPUFLAG_RISCV_ISA_D);
+
+	printf("Check for RISCV_ISA_E:\t");
+	CHECK_FOR_FLAG(RTE_CPUFLAG_RISCV_ISA_E);
+
+	printf("Check for RISCV_ISA_F:\t");
+	CHECK_FOR_FLAG(RTE_CPUFLAG_RISCV_ISA_F);
+
+	printf("Check for RISCV_ISA_G:\t");
+	CHECK_FOR_FLAG(RTE_CPUFLAG_RISCV_ISA_G);
+
+	printf("Check for RISCV_ISA_H:\t");
+	CHECK_FOR_FLAG(RTE_CPUFLAG_RISCV_ISA_H);
+
+	printf("Check for RISCV_ISA_I:\t");
+	CHECK_FOR_FLAG(RTE_CPUFLAG_RISCV_ISA_I);
+
+	printf("Check for RISCV_ISA_J:\t");
+	CHECK_FOR_FLAG(RTE_CPUFLAG_RISCV_ISA_J);
+
+	printf("Check for RISCV_ISA_K:\t");
+	CHECK_FOR_FLAG(RTE_CPUFLAG_RISCV_ISA_K);
+
+	printf("Check for RISCV_ISA_L:\t");
+	CHECK_FOR_FLAG(RTE_CPUFLAG_RISCV_ISA_L);
+
+	printf("Check for RISCV_ISA_M:\t");
+	CHECK_FOR_FLAG(RTE_CPUFLAG_RISCV_ISA_M);
+
+	printf("Check for RISCV_ISA_N:\t");
+	CHECK_FOR_FLAG(RTE_CPUFLAG_RISCV_ISA_N);
+
+	printf("Check for RISCV_ISA_O:\t");
+	CHECK_FOR_FLAG(RTE_CPUFLAG_RISCV_ISA_O);
+
+	printf("Check for RISCV_ISA_P:\t");
+	CHECK_FOR_FLAG(RTE_CPUFLAG_RISCV_ISA_P);
+
+	printf("Check for RISCV_ISA_Q:\t");
+	CHECK_FOR_FLAG(RTE_CPUFLAG_RISCV_ISA_Q);
+
+	printf("Check for RISCV_ISA_R:\t");
+	CHECK_FOR_FLAG(RTE_CPUFLAG_RISCV_ISA_R);
+
+	printf("Check for RISCV_ISA_S:\t");
+	CHECK_FOR_FLAG(RTE_CPUFLAG_RISCV_ISA_S);
+
+	printf("Check for RISCV_ISA_T:\t");
+	CHECK_FOR_FLAG(RTE_CPUFLAG_RISCV_ISA_T);
+
+	printf("Check for RISCV_ISA_U:\t");
+	CHECK_FOR_FLAG(RTE_CPUFLAG_RISCV_ISA_U);
+
+	printf("Check for RISCV_ISA_V:\t");
+	CHECK_FOR_FLAG(RTE_CPUFLAG_RISCV_ISA_V);
+
+	printf("Check for RISCV_ISA_W:\t");
+	CHECK_FOR_FLAG(RTE_CPUFLAG_RISCV_ISA_W);
+
+	printf("Check for RISCV_ISA_X:\t");
+	CHECK_FOR_FLAG(RTE_CPUFLAG_RISCV_ISA_X);
+
+	printf("Check for RISCV_ISA_Y:\t");
+	CHECK_FOR_FLAG(RTE_CPUFLAG_RISCV_ISA_Y);
+
+	printf("Check for RISCV_ISA_Z:\t");
+	CHECK_FOR_FLAG(RTE_CPUFLAG_RISCV_ISA_Z);
+#endif
+
 	/*
 	 * Check if invalid data is handled properly
 	 */
-- 
2.30.2

[PATCH v4 7/8] devtools: add RISC-V to test-meson-builds.sh

[Stanislaw Kardach]

Validate RISC-V compilation when test-meson-builds.sh is called. The
check will be only performed if appropriate toolchain is present on the
system (same as with other architectures).

Sponsored-by: Frank Zhao <Frank.Zhao@starfivetech.com>
Sponsored-by: Sam Grove <sam.grove@sifive.com>
Signed-off-by: Stanislaw Kardach <kda@semihalf.com>
---
 devtools/test-meson-builds.sh | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/devtools/test-meson-builds.sh b/devtools/test-meson-builds.sh
index a653b253cb..f732dccf6c 100755
--- a/devtools/test-meson-builds.sh
+++ b/devtools/test-meson-builds.sh
@@ -275,6 +275,10 @@ for f in $srcdir/config/ppc/ppc* ; do
 	build $targetdir $f ABI $use_shared
 done
 
+# RISC-V configuration
+build build-riscv64-linux-gcc $srcdir/config/riscv/riscv64_linux_gcc ABI \
+	$use_shared
+
 # Test installation of the x86-generic target, to be used for checking
 # the sample apps build using the pkg-config file for cflags and libs
 load_env cc
-- 
2.30.2

[PATCH v4 8/8] ci: add RISCV64 cross compilation job

[Stanislaw Kardach]

Checks cross-compilation using Ubuntu 20.04 x86.

Signed-off-by: David Marchand <david.marchand@redhat.com>
Signed-off-by: Stanislaw Kardach <kda@semihalf.com>
---
 .ci/linux-build.sh          |  4 ++++
 .github/workflows/build.yml | 11 ++++++++++-
 2 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/.ci/linux-build.sh b/.ci/linux-build.sh
index 1de8962f0e..06104eca22 100755
--- a/.ci/linux-build.sh
+++ b/.ci/linux-build.sh
@@ -74,6 +74,10 @@ if [ "$PPC64LE" = "true" ]; then
     cross_file=config/ppc/ppc64le-power8-linux-gcc-ubuntu
 fi
 
+if [ "$RISCV64" = "true" ]; then
+    cross_file=config/riscv/riscv64_linux_gcc
+fi
+
 if [ -n "$cross_file" ]; then
     OPTS="$OPTS --cross-file $cross_file"
 fi
diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index ad8ad1a187..7c8528cb04 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -26,6 +26,7 @@ jobs:
       MINI: ${{ matrix.config.mini != '' }}
       PPC64LE: ${{ matrix.config.cross == 'ppc64le' }}
       REF_GIT_TAG: v22.03
+      RISCV64: ${{ matrix.config.cross == 'riscv64' }}
       RUN_TESTS: ${{ contains(matrix.config.checks, 'tests') }}
 
     strategy:
@@ -74,6 +75,10 @@ jobs:
             compiler: gcc
             library: shared
             cross: ppc64le
+          - os: ubuntu-20.04
+            compiler: gcc
+            library: shared
+            cross: riscv64
 
     steps:
     - name: Checkout sources
@@ -132,8 +137,12 @@ jobs:
       if: env.PPC64LE == 'true'
       run: sudo apt install -y gcc-powerpc64le-linux-gnu libc6-dev-ppc64el-cross
         pkg-config-powerpc-linux-gnu
+    - name: Install riscv64 cross compiling packages
+      if: env.RISCV64 == 'true'
+      run: sudo apt install -y gcc-riscv64-linux-gnu libc6-dev-riscv64-cross
+        pkg-config-riscv64-linux-gnu
     - name: Install test tools packages
-      if: env.AARCH64 != 'true' || env.PPC64LE != 'true' || env.RUN_TESTS == 'true'
+      if: env.AARCH64 != 'true' || env.PPC64LE != 'true' || env.RISCV64 != 'true' || env.RUN_TESTS == 'true'
       run: sudo apt install -y gdb
     - name: Install doc generation packages
       if: env.BUILD_DOCS == 'true'
-- 
2.30.2

Re: [PATCH v4 0/8] Introduce support for RISC-V architecture

[David Marchand]

On Tue, May 31, 2022 at 4:14 PM Stanislaw Kardach <kda@semihalf.com> wrote:
>
> This patchset adds support for building and running DPDK on 64bit RISC-V
> architecture. The initial support targets rv64gc (rv64imafdc) ISA and
> was tested on SiFive Unmatched development board with the Freedom U740
> SoC running Linux (freedom-u-sdk based kernel).
> I have tested this codebase using DPDK unit and perf tests as well as
> test-pmd, l2fwd and l3fwd examples.
> The NIC attached to the DUT was Intel X520-DA2 which uses ixgbe PMD.
> On the UIO side, since U740 does not have an IOMMU, I've used igb_uio,
> uio_pci_generic and vfio-pci noiommu drivers.
>
> Functional verification done using meson tests. fast-tests suite passing with
> the default config.
>
> PMD verification done using a Intel x520-DA2 NIC (ixgbe) and the test-pmd
> application. Packet transfer checked using all UIO drivers available for
> non-IOMMU platforms: uio_pci_generic, vfio-pci noiommu and igb_uio.
>
> The i40e PMD driver is disabled on RISC-V as the rv64gc ISA has no vector
> operations.
>
> RISCV support is currently limited to Linux as the time measurement frequency
> discovery is tied to reading a device-tree node via procfs.
>
> Clang compilation currently not supported due to issues with missing relocation
> relaxation.
>
> Commit 1 introduces EAL and build system support for RISC-V architecture
>    as well as documentation updates.
> Commits 2-5 add missing defines and stubs to enable RISC-V operation in
>    non-EAL parts.
> Commit 6 adds RISC-V specific cpuflags test.
> Commits 7-8 add RISC-V build testing to test-meson-builds.sh and github CI.

Overall, the series lgtm.
It did not get much reviews, but the porting is straightforward and
clean enough.

I'm waiting for some compilation to finish and I will merge it for 22.07-rc1.


Some comments that will probably require some followup patches for rc2:

- I removed the known issue about --no-huge from the EAL patch.
This seems to be a generic issue that does not block the RISC V port
and can be re-submitted as a separate patch.


- I had some trouble with finding a right toolchain for test-meson-builds.sh.
The mentionned toolchains in the cross build guide don't work for me on FC36.
I managed to cross compile with a Bootlin toolchain, though I had to
adjust the cross compilation file.
I'll probably end up compiling my own toolchain later unless you have
a better idea.

At least the compilation in GHA works.


- The hardcoded pkg-config path in config/riscv/riscv64_linux_gcc does
not seem generic.
It is probably not a big issue, but I'd rather move it to a Ubuntu
specific cross compile meson file.
WDYT?


- I adjusted some coding style in some asm and some indentation and
wording in meson.


- The cross compilation guide mentions using
crossbuild-essential-riscv64 for Ubuntu.
We should switch to it in GHA.
Though after trying myself, there is an issue in the C++ headers check
in GHA for some acl header including rte_vect.h.
Can you have a look?


- There was a patch from Heinrich about native compilation, can you review it?


-- 
David Marchand

Re: [PATCH v4 0/8] Introduce support for RISC-V architecture

[David Marchand]

On Wed, Jun 8, 2022 at 10:41 AM David Marchand
<david.marchand@redhat.com> wrote:
> On Tue, May 31, 2022 at 4:14 PM Stanislaw Kardach <kda@semihalf.com> wrote:
> >
> > This patchset adds support for building and running DPDK on 64bit RISC-V
> > architecture. The initial support targets rv64gc (rv64imafdc) ISA and
> > was tested on SiFive Unmatched development board with the Freedom U740
> > SoC running Linux (freedom-u-sdk based kernel).
> > I have tested this codebase using DPDK unit and perf tests as well as
> > test-pmd, l2fwd and l3fwd examples.
> > The NIC attached to the DUT was Intel X520-DA2 which uses ixgbe PMD.
> > On the UIO side, since U740 does not have an IOMMU, I've used igb_uio,
> > uio_pci_generic and vfio-pci noiommu drivers.
> >
> > Functional verification done using meson tests. fast-tests suite passing with
> > the default config.
> >
> > PMD verification done using a Intel x520-DA2 NIC (ixgbe) and the test-pmd
> > application. Packet transfer checked using all UIO drivers available for
> > non-IOMMU platforms: uio_pci_generic, vfio-pci noiommu and igb_uio.
> >
> > The i40e PMD driver is disabled on RISC-V as the rv64gc ISA has no vector
> > operations.
> >
> > RISCV support is currently limited to Linux as the time measurement frequency
> > discovery is tied to reading a device-tree node via procfs.
> >
> > Clang compilation currently not supported due to issues with missing relocation
> > relaxation.
> >
> > Commit 1 introduces EAL and build system support for RISC-V architecture
> >    as well as documentation updates.
> > Commits 2-5 add missing defines and stubs to enable RISC-V operation in
> >    non-EAL parts.
> > Commit 6 adds RISC-V specific cpuflags test.
> > Commits 7-8 add RISC-V build testing to test-meson-builds.sh and github CI.
>
> Overall, the series lgtm.
> It did not get much reviews, but the porting is straightforward and
> clean enough.
>
> I'm waiting for some compilation to finish and I will merge it for 22.07-rc1.

Welcome to RISC-V in DPDK!

Let's work out the last details in -rc2.
Series applied, thanks.


-- 
David Marchand

Re: [PATCH v4 0/8] Introduce support for RISC-V architecture

[Stanisław Kardach]

On Wed, Jun 8, 2022 at 11:32 AM David Marchand
<david.marchand@redhat.com> wrote:
>
> On Wed, Jun 8, 2022 at 10:41 AM David Marchand
> <david.marchand@redhat.com> wrote:
> > On Tue, May 31, 2022 at 4:14 PM Stanislaw Kardach <kda@semihalf.com> wrote:
> > >
> > > This patchset adds support for building and running DPDK on 64bit RISC-V
> > > architecture. The initial support targets rv64gc (rv64imafdc) ISA and
> > > was tested on SiFive Unmatched development board with the Freedom U740
> > > SoC running Linux (freedom-u-sdk based kernel).
> > > I have tested this codebase using DPDK unit and perf tests as well as
> > > test-pmd, l2fwd and l3fwd examples.
> > > The NIC attached to the DUT was Intel X520-DA2 which uses ixgbe PMD.
> > > On the UIO side, since U740 does not have an IOMMU, I've used igb_uio,
> > > uio_pci_generic and vfio-pci noiommu drivers.
> > >
> > > Functional verification done using meson tests. fast-tests suite passing with
> > > the default config.
> > >
> > > PMD verification done using a Intel x520-DA2 NIC (ixgbe) and the test-pmd
> > > application. Packet transfer checked using all UIO drivers available for
> > > non-IOMMU platforms: uio_pci_generic, vfio-pci noiommu and igb_uio.
> > >
> > > The i40e PMD driver is disabled on RISC-V as the rv64gc ISA has no vector
> > > operations.
> > >
> > > RISCV support is currently limited to Linux as the time measurement frequency
> > > discovery is tied to reading a device-tree node via procfs.
> > >
> > > Clang compilation currently not supported due to issues with missing relocation
> > > relaxation.
> > >
> > > Commit 1 introduces EAL and build system support for RISC-V architecture
> > >    as well as documentation updates.
> > > Commits 2-5 add missing defines and stubs to enable RISC-V operation in
> > >    non-EAL parts.
> > > Commit 6 adds RISC-V specific cpuflags test.
> > > Commits 7-8 add RISC-V build testing to test-meson-builds.sh and github CI.
> >
> > Overall, the series lgtm.
> > It did not get much reviews, but the porting is straightforward and
> > clean enough.
> >
> > I'm waiting for some compilation to finish and I will merge it for 22.07-rc1.
>
> Welcome to RISC-V in DPDK!
>
> Let's work out the last details in -rc2.
> Series applied, thanks.
Awesome, thanks!
>
>
> --
> David Marchand
>

Re: [PATCH v4 0/8] Introduce support for RISC-V architecture

[Heinrich Schuchardt]

On 6/8/22 10:41, David Marchand wrote:
> On Tue, May 31, 2022 at 4:14 PM Stanislaw Kardach <kda@semihalf.com> wrote:
>>
>> This patchset adds support for building and running DPDK on 64bit RISC-V
>> architecture. The initial support targets rv64gc (rv64imafdc) ISA and
>> was tested on SiFive Unmatched development board with the Freedom U740
>> SoC running Linux (freedom-u-sdk based kernel).
>> I have tested this codebase using DPDK unit and perf tests as well as
>> test-pmd, l2fwd and l3fwd examples.
>> The NIC attached to the DUT was Intel X520-DA2 which uses ixgbe PMD.
>> On the UIO side, since U740 does not have an IOMMU, I've used igb_uio,
>> uio_pci_generic and vfio-pci noiommu drivers.
>>
>> Functional verification done using meson tests. fast-tests suite passing with
>> the default config.
>>
>> PMD verification done using a Intel x520-DA2 NIC (ixgbe) and the test-pmd
>> application. Packet transfer checked using all UIO drivers available for
>> non-IOMMU platforms: uio_pci_generic, vfio-pci noiommu and igb_uio.
>>
>> The i40e PMD driver is disabled on RISC-V as the rv64gc ISA has no vector
>> operations.
>>
>> RISCV support is currently limited to Linux as the time measurement frequency
>> discovery is tied to reading a device-tree node via procfs.
>>
>> Clang compilation currently not supported due to issues with missing relocation
>> relaxation.
>>
>> Commit 1 introduces EAL and build system support for RISC-V architecture
>>     as well as documentation updates.
>> Commits 2-5 add missing defines and stubs to enable RISC-V operation in
>>     non-EAL parts.
>> Commit 6 adds RISC-V specific cpuflags test.
>> Commits 7-8 add RISC-V build testing to test-meson-builds.sh and github CI.
> 
> Overall, the series lgtm.
> It did not get much reviews, but the porting is straightforward and
> clean enough.
> 
> I'm waiting for some compilation to finish and I will merge it for 22.07-rc1.
> 
> 
> Some comments that will probably require some followup patches for rc2:
> 
> - I removed the known issue about --no-huge from the EAL patch.
> This seems to be a generic issue that does not block the RISC V port
> and can be re-submitted as a separate patch.
> 
> 
> - I had some trouble with finding a right toolchain for test-meson-builds.sh.
> The mentionned toolchains in the cross build guide don't work for me on FC36.
> I managed to cross compile with a Bootlin toolchain, though I had to
> adjust the cross compilation file.
> I'll probably end up compiling my own toolchain later unless you have
> a better idea.

Please, consider building natively too. https://wiki.ubuntu.com/RISC-V 
describes setting setting up a virtual machine.

> 
> At least the compilation in GHA works.
> 
> 
> - The hardcoded pkg-config path in config/riscv/riscv64_linux_gcc does
> not seem generic.
> It is probably not a big issue, but I'd rather move it to a Ubuntu
> specific cross compile meson file.
> WDYT?
> 
> 
> - I adjusted some coding style in some asm and some indentation and
> wording in meson.
> 
> 
> - The cross compilation guide mentions using
> crossbuild-essential-riscv64 for Ubuntu.
> We should switch to it in GHA.
> Though after trying myself, there is an issue in the C++ headers check
> in GHA for some acl header including rte_vect.h.
> Can you have a look?
> 
> 
> - There was a patch from Heinrich about native compilation, can you review it?

[PATCH] Fix RISC-V builds
http://mails.dpdk.org/archives/dev/2022-May/242749.html
relates to PktGen.

Best regards

Heinrich

Re: [PATCH v4 0/8] Introduce support for RISC-V architecture

[Stanisław Kardach]

On Wed, Jun 8, 2022 at 10:42 AM David Marchand
<david.marchand@redhat.com> wrote:
>
> On Tue, May 31, 2022 at 4:14 PM Stanislaw Kardach <kda@semihalf.com> wrote:
> >
> > This patchset adds support for building and running DPDK on 64bit RISC-V
> > architecture. The initial support targets rv64gc (rv64imafdc) ISA and
> > was tested on SiFive Unmatched development board with the Freedom U740
> > SoC running Linux (freedom-u-sdk based kernel).
> > I have tested this codebase using DPDK unit and perf tests as well as
> > test-pmd, l2fwd and l3fwd examples.
> > The NIC attached to the DUT was Intel X520-DA2 which uses ixgbe PMD.
> > On the UIO side, since U740 does not have an IOMMU, I've used igb_uio,
> > uio_pci_generic and vfio-pci noiommu drivers.
> >
> > Functional verification done using meson tests. fast-tests suite passing with
> > the default config.
> >
> > PMD verification done using a Intel x520-DA2 NIC (ixgbe) and the test-pmd
> > application. Packet transfer checked using all UIO drivers available for
> > non-IOMMU platforms: uio_pci_generic, vfio-pci noiommu and igb_uio.
> >
> > The i40e PMD driver is disabled on RISC-V as the rv64gc ISA has no vector
> > operations.
> >
> > RISCV support is currently limited to Linux as the time measurement frequency
> > discovery is tied to reading a device-tree node via procfs.
> >
> > Clang compilation currently not supported due to issues with missing relocation
> > relaxation.
> >
> > Commit 1 introduces EAL and build system support for RISC-V architecture
> >    as well as documentation updates.
> > Commits 2-5 add missing defines and stubs to enable RISC-V operation in
> >    non-EAL parts.
> > Commit 6 adds RISC-V specific cpuflags test.
> > Commits 7-8 add RISC-V build testing to test-meson-builds.sh and github CI.
>
> Overall, the series lgtm.
> It did not get much reviews, but the porting is straightforward and
> clean enough.
>
> I'm waiting for some compilation to finish and I will merge it for 22.07-rc1.
>
>
> Some comments that will probably require some followup patches for rc2:
>
> - I removed the known issue about --no-huge from the EAL patch.
> This seems to be a generic issue that does not block the RISC V port
> and can be re-submitted as a separate patch.
If you mean the modified entry in the known_issues, I've added it at
Heinrich's request, although I agree I should have placed it in a
separate patch.
>
>
> - I had some trouble with finding a right toolchain for test-meson-builds.sh.
> The mentionned toolchains in the cross build guide don't work for me on FC36.
> I managed to cross compile with a Bootlin toolchain, though I had to
> adjust the cross compilation file.
> I'll probably end up compiling my own toolchain later unless you have
> a better idea.
I have just checked with fedora/36 docker and it seems that only gcc
and binutils packages are there but stdlib isn't. Hence meson fails at
basic checks because it can't find "stdio.h". So that's a bug to post
to Fedora I believe.
What does work in terms of cross-compiling is using a
riscv-gnu-toolchain tarball + modified cross-file (i.e. from here:
https://github.com/riscv-collab/riscv-gnu-toolchain/releases/tag/2022.06.03).
That most likely won't work for building RPMs but for static
compilations it might be enough.
Or you could use a Ubuntu docker and cross-compile there (though the
same problem as before):
  docker run -v /path/to/dpdk:/opt/dpdk -it ubuntu:jammy /bin/bash
Or a VM as Heinrich suggested.
>
> At least the compilation in GHA works.
That's because I've used Ubuntu as a base, which has a proper
toolchain setup. Also riscv-gnu-toolchain project targets Ubuntu, so
that helps.
>
>
> - The hardcoded pkg-config path in config/riscv/riscv64_linux_gcc does
> not seem generic.
> It is probably not a big issue, but I'd rather move it to a Ubuntu
> specific cross compile meson file.
> WDYT?
I think I'll rename the config file.
In theory, the man file of pkg-config
(https://linux.die.net/man/1/pkg-config) mentions the default
searching path as prefix/lib/pkgconfig. Prefix being
/usr/riscv64-linux-gnu the generic location should be
/usr/riscv64-linux-gnu/lib/pkgconfig but Ubuntu doesn't follow that.
There are no RISC-V cross-libs offering pkg-config neither in Ubuntu
or Fedora so I can't really tell what's the best path to use. Though
that also means we won't hit this issue for some time.
>
>
> - I adjusted some coding style in some asm and some indentation and
> wording in meson.
Thanks!
>
>
> - The cross compilation guide mentions using
> crossbuild-essential-riscv64 for Ubuntu.
> We should switch to it in GHA.
> Though after trying myself, there is an issue in the C++ headers check
> in GHA for some acl header including rte_vect.h.
> Can you have a look?
I'm testing a fix for this. I have not taken C++ type conversion rules
into account.
>
>
> - There was a patch from Heinrich about native compilation, can you review it?
I see it was merged but your question from that thread still stands.
I'm compiling native now to check.
>

>
> --
> David Marchand
>