[dpdk-dev] [PATCH v13 00/14] Interrupt mode PMD
Cunming Liang
cunming.liang at intel.com
Fri Jun 19 06:00:28 CEST 2015
v13 changes
- version map cleanup for v2.1
- replace RTE_EAL_RX_INTR by RTE_NEXT_ABI for ABI compatibility
Patch series v12
Acked-by: Stephen Hemminger <stephen at networkplumber.org>
Acked-by: Danny Zhou <danny.zhou at intel.com>
v12 changes
- bsd cleanup for unused variable warning
- fix awkward line split in debug message
v11 changes
- typo cleanup and check kernel style
v10 changes
- code rework to return actual error code
- bug fix for lsc when using uio_pci_generic
v9 changes
- code rework to fix open comment
- bug fix for igb lsc when both lsc and rxq are enabled in vfio-msix
- new patch to turn off the feature by default so as to avoid v2.1 abi broken
v8 changes
- remove condition check for only vfio-msix
- add multiplex intr support when only one intr vector allowed
- lsc and rxq interrupt runtime enable decision
- add safe event delete while the event wakeup execution happens
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. [FIXED]
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 (14):
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/linux: fix comments typo on vfio msi
eal/linux: add interrupt vectors handling on VFIO
eal/linux: standalone intr event fd create support
eal/linux: fix lsc read error in uio_pci_generic
eal/bsd: dummy for new intr definition
eal/bsd: fix inappropriate linuxapp referred in bsd
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
abi: fix v2.1 abi broken issue
drivers/net/e1000/igb_ethdev.c | 311 ++++++++++--
drivers/net/ixgbe/ixgbe_ethdev.c | 519 ++++++++++++++++++++-
drivers/net/ixgbe/ixgbe_ethdev.h | 4 +
examples/l3fwd-power/main.c | 202 ++++++--
lib/librte_eal/bsdapp/eal/eal_interrupts.c | 30 ++
.../bsdapp/eal/include/exec-env/rte_interrupts.h | 91 +++-
lib/librte_eal/bsdapp/eal/rte_eal_version.map | 12 +
lib/librte_eal/linuxapp/eal/eal_interrupts.c | 362 ++++++++++++--
.../linuxapp/eal/include/exec-env/rte_interrupts.h | 219 +++++++++
lib/librte_eal/linuxapp/eal/rte_eal_version.map | 15 +
lib/librte_ether/rte_ethdev.c | 109 +++++
lib/librte_ether/rte_ethdev.h | 132 ++++++
lib/librte_ether/rte_ether_version.map | 4 +
13 files changed, 1883 insertions(+), 127 deletions(-)
--
1.8.1.4
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