[dpdk-dev] [PATCH 0/6] Add virtio support in arm/arm64

Santosh Shukla sshukla at mvista.com
Fri Dec 4 18:35:13 CET 2015


This patch set add basic infrastrucure to run virtio-net-pci pmd driver for
arm64/arm. Tested on ThunderX platfrom. Verified for existing dpdk(s) test
applications like:
- ovs-dpdk-vhost-user: across the VM's, for the use-cases like guest2guest and
  Host2Guest
- testpmd application: Tested for max virtio-net-pci interface currently
  supported in kernel i.e. 31 interface. 

Builds successfully for armv7/v8/thunderX and x86_64/i686 platforms. Made sure
that patch changes donot break for x86_64 case. Done similar tests for x86_64
too.

Patch summary:
- First patch adds RTE_VIRTIO_INC_VECTOR config, much needed for archs like
  arm/arm64 as they don't support vectored implementation, also wont able to
  build.
- Second patch is in-general fix for i686.
- Third patch is to emulate x86-style of {in,out}[b,w,l] api support for armv7/v8.
  As virtio-net-pci pmd driver uses those apis for port rd/wr {b,w,l}
- Fourth patch to enable VIRTIO_PMD feature in armv7/v8/thunderX config.
- Fifth patch to disable iopl syscall, As arm/arm64 linux kernel doesn't support
  them.
- Sixth patch introduces ioport memdevice called /dev/igb_ioport by which virtio
  pmd driver could able to rd/wr PCI_IOBAR.
  {applicable for arm/arm64 only, tested for arm64 as of now} 

  On Sixth patch: There is other way to achieve desired by adding support in
  linux kernel character memory driver such that user could do file rd/wr for
  half-word/word size data. Currently character memory driver support byte rd/wr
  via interface `/dev/port`. Such proposal already discussed long back at lkml
  thread [2] but couldn;t got much atttaction though! I am going to send out
  similar implementation as an RFC to dpdk-dev thread and to linux-kernel
  community{todo}. However like to listen to current approach
  review/comment/feedback.

Thanks in advance.

patchset developed on upstream dpdk commit 538020a then pulled jerin's
dependancy patches [1] on top.


[1] http://permalink.gmane.org/gmane.comp.networking.dpdk.devel/29068
[2] https://lkml.org/lkml/2014/5/10/189

Santosh Shukla (6):
  virtio: Introduce config RTE_VIRTIO_INC_VECTOR
  config: i686: set RTE_VIRTIO_INC_VECTOR=n
  virtio: armv7/v8: Introdice api to emulate x86-style of PCI/ISA
    ioport access
  config: armv7/v8: Enable RTE_LIBRTE_VIRTIO_PMD
  linuxapp: eal: arm: Always return 0 for rte_eal_iopl_init()
  virtio: arm/arm64: memory mapped IO support in pmd driver

 config/common_linuxapp                             |    1 +
 config/defconfig_arm-armv7a-linuxapp-gcc           |    6 +-
 config/defconfig_arm64-armv8a-linuxapp-gcc         |    6 +-
 config/defconfig_i686-native-linuxapp-gcc          |    1 +
 config/defconfig_i686-native-linuxapp-icc          |    1 +
 drivers/net/virtio/Makefile                        |    2 +-
 drivers/net/virtio/virtio_ethdev.c                 |  138 ++++++++++++-
 drivers/net/virtio/virtio_pci.h                    |   15 ++
 drivers/net/virtio/virtio_rxtx.c                   |    7 +
 .../common/include/arch/arm/rte_isa_io.h           |  212 ++++++++++++++++++++
 lib/librte_eal/linuxapp/eal/eal.c                  |    3 +
 lib/librte_eal/linuxapp/igb_uio/igb_uio.c          |   80 +++++++-
 12 files changed, 465 insertions(+), 7 deletions(-)
 create mode 100644 lib/librte_eal/common/include/arch/arm/rte_isa_io.h

-- 
1.7.9.5



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