[dpdk-dev] [PATCH v2 0/9] rxq interrupt mode for virtio PMD

[Jianfeng Tan]

v2:
  - Add PCI queue/irq config ops.
  - Move rxq interrupt settings before sending DRIVER OK.

Historically, virtio PMD can only be binded to igb_uio or
uio_pci_generic, and not for vfio-pci. Besides, quote from
http://dpdk.org/doc/guides-16.11/rel_notes/release_2_1.html:
  "Per queue RX interrupt events are only allowed in VFIO
   which supports multiple MSI-X vectors."

As Linux starts to support vfio noiommu mode since 4.8.0, it's
a good chance to enable rxq interrupt for virtio PMD.

How to test:

Step 1, prepare a VM image with kernel version >= 4.8.0.

Step 2, on the host, start a testpmd with a vhost port:
$ testpmd -c 0x7 -m 1024 --vdev 'eth_vhost0,iface=/tmp/sock0,queues=2' \
	--no-pci -- -i --rxq=2 --txq=2 --nb-cores=2

Step 3, boot the VM:
$ qemu ... -chardev socket,id=chr1,path=/tmp/sock0 \
	-netdev vhost-user,id=net1,chardev=chr1,vhostforce,queues=2 \
	-device virtio-net-pci,netdev=net1,mq=on,vectors=5 ...

Step 4, start l3fwd-power in VM:
$ l3fwd-power -c 0x3 -n 4 -- -p 1 -P --config="(0,0,1),(0,1,1)" --no-numa

Step 5, send packets from testpmd on the host:
$ start tx_first

Then l3fwd-power outputs:
L3FWD_POWER: lcore 1 is waked up from rx interrupt on port 0 queue 0
L3FWD_POWER: lcore 1 is waked up from rx interrupt on port 0 queue 1

Signed-off-by: Jianfeng Tan <jianfeng.tan at intel.com>
Jianfeng Tan (9):
  net/virtio: fix rewriting LSC flag
  net/virtio: add Rx descriptor check
  net/virtio: add PCI ops for queue/irq binding
  net/virtio: add Rx queue intr enable/disable functions
  net/virtio: setup rxq interrupts
  net/virtio: unbind intr/eventfd when stop device
  net/virtio: unmapping queue/irq when close device
  examples/l3fwd: add parse-ptype option
  examples/l3fwd-power: fix not stop and close device

 drivers/net/virtio/virtio_ethdev.c | 149 +++++++++++++++++++++++++++++++++++--
 drivers/net/virtio/virtio_ethdev.h |   3 +
 drivers/net/virtio/virtio_pci.c    |  29 ++++++++
 drivers/net/virtio/virtio_pci.h    |   5 ++
 drivers/net/virtio/virtio_rxtx.c   |   9 +++
 drivers/net/virtio/virtqueue.c     |  11 ---
 drivers/net/virtio/virtqueue.h     |  24 +++++-
 examples/l3fwd-power/main.c        |  70 ++++++++++++++++-
 8 files changed, 282 insertions(+), 18 deletions(-)

-- 
2.7.4