[dpdk-dev] [PATCH v2 00/16] Support ARMv7 architecture

[Jan Viktorin]

Hello DPDK community, Thomas, Dave,

here I propose the second version of the ARM support patch series. I've included
some ideas from Dave's patch. There are no big changes to the original series.

Important:

* The timer issue has now 2 solutions, the user may configure to use PMU counter
  or the clock_gettime API. The PMU counter may however break perf or other tools
  using the PMU Linux API. This is the reason why I did not make it the default.
  Also, I didn't include the Linux Kernel module that enables the PMU for userspace.
  There is a note in the rte_cycles.h about it. You should know what you are doing
  if you use that, so you may also write that simple driver or get from the Dave's
  patch. Later, we can integrate it, after we have some real PMD driver (and some
  supporting Linux Kernel module infra...).

* There is the NEON implementation of memcpy. It is faster then the native one
  (you can see stats in the patch), however, we must be sure, the target CPU contains
  the NEON co-processor. Also, for longer data lengths and ARM SoCs, the NEON memcpy
  implementation can be much slower then the native one. So this is again configurable.

* The cpuflags now contains the best from my and Dave's patchs.

* ACL build is broken. I've included a patch (16) that just prevents to pass -msse4.1
  into gcc if it does not support it. But that does not solve the whole issue.

* LPM build is broken unless you apply the patch 15. However, this is not the right
  solution and I provided just to have a workaround. I don't expect to merge it.

* I've added myself to the MAINTAINERS. Dave, would I like to be there as well?

* The Cortex A7, A8, A9 cores are non-LPAE (non Large Physical Address Extension)
  and thus there is no upstream support for huge pages in the Linux Kernel. It sounds
  like useless for devices with max 4 GB of RAM (usually 0.5-2 GB). However, our
  measurements have shown that it improve performance. A patch is somewhere deep in
  the kernel.org mailing lists.

* Only the GCC toolchain is considered at the moment.

Other details are included in each individual commit.

---

You can pull the changes from

  https://github.com/RehiveTech/dpdk.git arm-support-v2

since commit d08d304508a8a8caf255baf622ab65db1fec952c:

  eal/linux: make alarm not affected by system time jump (2015-10-21 17:01:24 +0200)

up to 57396c958571b651b4d14f90683b3d1b2d42a70e:

  acl: check for SSE 4.1 support (2015-10-26 17:29:36 +0100)

---

Regards
Jan Viktorin

Jan Viktorin (7):
  eal/arm: implement rdtsc by PMU or clock_gettime
  eal/arm: use vector memcpy only when NEON is enabled
  eal/arm: detect arm architecture in cpu flags
  eal/arm: rwlock support for ARM
  gcc/arm: avoid alignment errors to break build
  maintainers: claim responsibility for ARMv7
  acl: check for SSE 4.1 support

Vlastimil Kosar (9):
  mk: Introduce ARMv7 architecture
  eal/arm: atomic operations for ARM
  eal/arm: byte order operations for ARM
  eal/arm: cpu cycle operations for ARM
  eal/arm: prefetch operations for ARM
  eal/arm: spinlock operations for ARM (without HTM)
  eal/arm: vector memcpy for ARM
  eal/arm: cpu flag checks for ARM
  lpm/arm: implement rte_lpm_lookupx4 using rte_lpm_lookup_bulk on
    for-x86

 MAINTAINERS                                        |   4 +
 app/test/test_cpuflags.c                           |   5 +
 config/defconfig_arm-armv7-a-linuxapp-gcc          |  75 +++++
 lib/librte_acl/Makefile                            |   4 +
 .../common/include/arch/arm/rte_atomic.h           | 256 ++++++++++++++++
 .../common/include/arch/arm/rte_byteorder.h        | 148 ++++++++++
 .../common/include/arch/arm/rte_cpuflags.h         | 192 ++++++++++++
 .../common/include/arch/arm/rte_cycles.h           | 121 ++++++++
 .../common/include/arch/arm/rte_memcpy.h           | 325 +++++++++++++++++++++
 .../common/include/arch/arm/rte_prefetch.h         |  61 ++++
 .../common/include/arch/arm/rte_rwlock.h           |  40 +++
 .../common/include/arch/arm/rte_spinlock.h         | 114 ++++++++
 lib/librte_lpm/rte_lpm.h                           |  71 +++++
 mk/arch/arm/rte.vars.mk                            |  39 +++
 mk/machine/armv7-a/rte.vars.mk                     |  60 ++++
 mk/rte.cpuflags.mk                                 |   6 +
 mk/toolchain/gcc/rte.vars.mk                       |   6 +
 17 files changed, 1527 insertions(+)
 create mode 100644 config/defconfig_arm-armv7-a-linuxapp-gcc
 create mode 100644 lib/librte_eal/common/include/arch/arm/rte_atomic.h
 create mode 100644 lib/librte_eal/common/include/arch/arm/rte_byteorder.h
 create mode 100644 lib/librte_eal/common/include/arch/arm/rte_cpuflags.h
 create mode 100644 lib/librte_eal/common/include/arch/arm/rte_cycles.h
 create mode 100644 lib/librte_eal/common/include/arch/arm/rte_memcpy.h
 create mode 100644 lib/librte_eal/common/include/arch/arm/rte_prefetch.h
 create mode 100644 lib/librte_eal/common/include/arch/arm/rte_rwlock.h
 create mode 100644 lib/librte_eal/common/include/arch/arm/rte_spinlock.h
 create mode 100644 mk/arch/arm/rte.vars.mk
 create mode 100644 mk/machine/armv7-a/rte.vars.mk

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2.6.1