[PATCH v2 0/5] add LSC and Rxq interrupt for virtio-user

[Jianfeng Tan <jianfeng.tan@intel.com>]

v2:
  - Drop the support of LSC for virtio-user + vhost-kernel as the backend.
  - Rearrange the sequence of intr config and DRIVER_OK.
  - Address comments from yuanhan.
  - Update doc.

This is an attempt to add LSC and Rxq interrupt for a virtual device,
virtio-user (with the backend of both vhost-user and vhost-kernel).

We need to support:
Case 1. Rxq interrupt for virtio-user + vhost-user as the backend.
Case 2. LSC interrupt for virtio-user + vhost-user as the backend.
Case 3. Rxq interrupt for virtio-user + vhost-kernel as the backend.

Another case is not supported now as we did not find a way to monitor
tap device up/down events:
  - LSC interrupt for virtio-user + vhost-kernel as the backend.

HOW TO TEST:

Step 1: start testpmd with a virtual vhost device:
  $ testpmd -c 0x3 -n 4 --socket-mem 1024 --no-pci \
	  --vdev 'eth_vhost0,iface=/tmp/sock0' -- -i

Step 2: start l3fwd-power with a virtio-user device:
  $ l3fwd-power -c 0xc -n 4 --socket-mem 1024 --no-pci \
	  --file-prefix=l3fwd-pwd \
	  --vdev=virtio_user0,path=/tmp/sock0 \
	  -- -p 1 -P --config="(0,0,1)" \
	  --no-numa --parse-ptype

Step 3: start burst in testpmd
  (testpmd)> start tx_first

  Packets will be received and forwarded back by l3fwd-power.
  And l3fwd-power will keep in polling mode.

Step 4: stop burst in testpmd
  (testpmd)> stop

  l3fwd-power will change to interrupt mode with few CPU
  consumption.

Step 5: kill testpmd
  $ kill -p `pidof testpmd`

  The link status will be changed to down in l3fwd-power.

Signed-off-by: Jianfeng Tan <jianfeng.tan@intel.com>


Jianfeng Tan (5):
  eal/linux: add interrupt type for vdev
  net/virtio: add interrupt configure for vdev
  net/virtio-user: add rxq interrupt mode support
  net/virtio-user: support to report net status
  net/virtio-user: add lsc support

 doc/guides/rel_notes/release_17_05.rst             | 12 ++++
 drivers/net/virtio/virtio_ethdev.c                 | 59 +++++++++++++++---
 drivers/net/virtio/virtio_ethdev.h                 |  2 +
 drivers/net/virtio/virtio_user/virtio_user_dev.c   | 28 ++++++++-
 drivers/net/virtio/virtio_user/virtio_user_dev.h   |  2 +-
 drivers/net/virtio/virtio_user_ethdev.c            | 70 +++++++++++++++++++---
 lib/librte_eal/linuxapp/eal/eal_interrupts.c       | 30 +++++++++-
 .../linuxapp/eal/include/exec-env/rte_interrupts.h |  5 +-
 8 files changed, 186 insertions(+), 22 deletions(-)

-- 
2.7.4