[dpdk-dev] From: Cunming Liang <cunming.liang@intel.com>

[Cunming Liang <cunming.liang@intel.com>]

v7 changes
 - decouple epoll event and intr operation
 - add condition check in the case intr vector is disabled
 - renaming some APIs

v6 changes
 - split rte_intr_wait_rx_pkt into two APIs 'wait' and 'set'.
 - rewrite rte_intr_rx_wait/rte_intr_rx_set.
 - using vector number instead of queue_id as interrupt API params.
 - patch reorder and split.

v5 changes
 - Rebase the patchset onto the HEAD
 - Isolate ethdev from EAL for new-added wait-for-rx interrupt function
 - Export wait-for-rx interrupt function for shared libraries
 - Split-off a new patch file for changed struct rte_intr_handle that
   other patches depend on, to avoid breaking git bisect
 - Change sample applicaiton to accomodate EAL function spec change
   accordingly

v4 changes
 - Export interrupt enable/disable functions for shared libraries
 - Adjust position of new-added structure fields and functions to
   avoid breaking ABI
 
v3 changes
 - Add return value for interrupt enable/disable functions
 - Move spinlok from PMD to L3fwd-power
 - Remove unnecessary variables in e1000_mac_info
 - Fix miscelleous review comments
 
v2 changes
 - Fix compilation issue in Makefile for missed header file.
 - Consolidate internal and community review comments of v1 patch set.
 
The patch series introduce low-latency one-shot rx interrupt into DPDK with
polling and interrupt mode switch control example.
 
DPDK userspace interrupt notification and handling mechanism is based on UIO
with below limitation:
1) It is designed to handle LSC interrupt only with inefficient suspended
   pthread wakeup procedure (e.g. UIO wakes up LSC interrupt handling thread
   which then wakes up DPDK polling thread). In this way, it introduces
   non-deterministic wakeup latency for DPDK polling thread as well as packet
   latency if it is used to handle Rx interrupt.
2) UIO only supports a single interrupt vector which has to been shared by
   LSC interrupt and interrupts assigned to dedicated rx queues.
 
This patchset includes below features:
1) Enable one-shot rx queue interrupt in ixgbe PMD(PF & VF) and igb PMD(PF only).
2) Build on top of the VFIO mechanism instead of UIO, so it could support
   up to 64 interrupt vectors for rx queue interrupts.
3) Have 1 DPDK polling thread handle per Rx queue interrupt with a dedicated
   VFIO eventfd, which eliminates non-deterministic pthread wakeup latency in
   user space.
4) Demonstrate interrupts control APIs and userspace NAIP-like polling/interrupt
   switch algorithms in L3fwd-power example.

Known limitations:
1) It does not work for UIO due to a single interrupt eventfd shared by LSC
   and rx queue interrupt handlers causes a mess.
2) LSC interrupt is not supported by VF driver, so it is by default disabled
   in L3fwd-power now. Feel free to turn in on if you want to support both LSC
   and rx queue interrupts on a PF.

Cunming Liang (10):
  eal/linux: add interrupt vectors support in intr_handle
  eal/linux: add rte_epoll_wait/ctl support
  eal/linux: add API to set rx interrupt event monitor
  eal/bsd: dummy for new intr definition
  eal/linux: fix comments typo on vfio msi
  eal/linux: add interrupt vectors handling on VFIO
  ethdev: add rx intr enable, disable and ctl functions
  ixgbe: enable rx queue interrupts for both PF and VF
  igb: enable rx queue interrupts for PF
  l3fwd-power: enable one-shot rx interrupt and polling/interrupt mode
    switch

 examples/l3fwd-power/main.c                        | 206 ++++++++--
 .../bsdapp/eal/include/exec-env/rte_interrupts.h   |   6 +
 lib/librte_eal/linuxapp/eal/eal_interrupts.c       | 232 +++++++++--
 lib/librte_eal/linuxapp/eal/eal_pci_vfio.c         |  12 +
 .../linuxapp/eal/include/exec-env/rte_interrupts.h |  97 +++++
 lib/librte_eal/linuxapp/eal/rte_eal_version.map    |   4 +
 lib/librte_ether/rte_ethdev.c                      | 132 +++++++
 lib/librte_ether/rte_ethdev.h                      | 104 +++++
 lib/librte_ether/rte_ether_version.map             |   4 +
 lib/librte_pmd_e1000/e1000_ethdev.h                |   3 +
 lib/librte_pmd_e1000/igb_ethdev.c                  | 256 +++++++++++--
 lib/librte_pmd_ixgbe/ixgbe_ethdev.c                | 425 ++++++++++++++++++++-
 lib/librte_pmd_ixgbe/ixgbe_ethdev.h                |   7 +
 13 files changed, 1394 insertions(+), 94 deletions(-)

-- 
1.8.1.4