[dpdk-dev] [PATCH v2 0/3] Support zero copy RX/TX in user space vhost

[Ouyang Changchun <changchun.ouyang@intel.com>]

This patch series support user space vhost zero copy. It removes packets copying between host and guest
in RX/TX. And it introduces an extra ring to store the detached mbufs. At initialization stage all mbufs
put into this ring; when one guest starts, vhost gets the available buffer address allocated by guest
for RX and translates them into host space addresses, then attaches them to mbufs and puts the attached
mbufs into mempool.

Queue starting and DMA refilling will get mbufs from mempool and use them to set the DMA addresses.
 
For TX, it gets the buffer addresses of available packets to be transmitted from guest and translates
them to host space addresses, then attaches them to mbufs and puts them to TX queues.
After TX finishes, it pulls mbufs out from mempool, detaches them and puts them back into the extra ring.

This patch series also implement queue start and stop functionality in IXGBE PMD; and enable hardware
loopback for VMDQ mode in IXGBE PMD.

Ouyang Changchun (3):
  Add API to support queue start and stop functionality for RX/TX.
  Implement queue start and stop functionality in IXGBE PMD; Enable
    hardware loopback for VMDQ mode in IXGBE PMD.
  Support user space vhost zero copy, it removes packets copying between
    host and guest in RX/TX.

 examples/vhost/main.c                    | 1410 ++++++++++++++++++++++++++----
 examples/vhost/virtio-net.c              |  120 ++-
 examples/vhost/virtio-net.h              |   15 +-
 lib/librte_eal/linuxapp/eal/eal_memory.c |    2 +-
 lib/librte_ether/rte_ethdev.c            |  104 +++
 lib/librte_ether/rte_ethdev.h            |   80 ++
 lib/librte_pmd_ixgbe/ixgbe_ethdev.c      |    4 +
 lib/librte_pmd_ixgbe/ixgbe_ethdev.h      |    8 +
 lib/librte_pmd_ixgbe/ixgbe_rxtx.c        |  233 ++++-
 lib/librte_pmd_ixgbe/ixgbe_rxtx.h        |    6 +
 10 files changed, 1787 insertions(+), 195 deletions(-)

-- 
1.9.0