[dpdk-dev] [RFC v3 PATCH 0/8] event: eventdev OPDL PMD
liang.j.ma at intel.com
Thu Dec 21 18:27:42 CET 2017
The OPDL (Ordered Packet Distribution Library) eventdev is a specific
implementation of the eventdev API. It is particularly suited to packet
processing workloads that have high throughput and low latency
requirements. All packets follow the same path through the device.
The order which packets follow is determinted by the order in which
queues are set up. Packets are left on the ring until they are transmitted.
As a result packets do not go out of order.
The OPDL eventdev implements a subset of features of the eventdev API;
* Ordered (Parallel is supported as parallel is a subset of Ordered)
* Load balanced (for Atomic, Ordered, Parallel queues)
* Single Link (for single-link queues)
Single Port Queue
It is possible to create a Single Port Queue
RTE_EVENT_QUEUE_CFG_SINGLE_LINK. Packets dequeued from this queue do
not need to be re-enqueued (as is the case with an ordered queue). The
purpose of this queue is to allow for asynchronous handling of packets in
the middle of a pipeline. Ordered queues in the middle of a pipeline
cannot delete packets.
As stated the order in which packets travel through queues is static in
nature. They go through the queues in the order the queues are setup at
initialisation rte_event_queue_setup(). For example if an application
sets up 3 queues, Q0, Q1, Q2 and has 3 assoicated ports P0, P1, P2 and
P3 then packets must be
* Enqueued onto Q0 (typically through P0), then
* Dequeued from Q0 (typically through P1), then
* Enqueued onto Q1 (also through P1), then
* Dequeued from Q2 (typically through P2), then
* Enqueued onto Q3 (also through P2), then
* Dequeued from Q3 (typically through P3) and then transmitted on the
relevant eth port
The opdl implementation has a number of limitations. These limitations are
due to the static nature of the underlying queues. It is because of this
that the implementation can achieve such high throughput and low latency
The following list is a comprehensive outline of the what is supported and
the limitations / restrictions imposed by the opdl pmd
- The order in which packets moved between queues is static and fixed
(dynamic scheduling is not supported).
- NEW, RELEASE op type are not explicitly supported. RX (first enqueue)
implicitly adds NEW event types, and TX (last dequeue) implicitly does
RELEASE event types.
- All packets follow the same path through device queues.
- Flows within queues are NOT supported.
- Event priority is NOT supported.
- Once the device is stopped all inflight events are lost. Applications should
clear all inflight events before stopping it.
- Each port can only be associated with one queue.
- Each queue can have multiple ports associated with it.
- Each worker core has to dequeue the maximum burst size for that port.
General concept of event driven programming model
Original Ordered Pipeline Design slides
1. add dynamic log support.
2. update maintainer, release notes.
3. fix issues with review comments.
1. merge the opdl eventdev unit test code into opdl pmd.
2. propose three new capability capability flags for overall eventdev.
3. remove the opdl pmd example code.
4. remove the opdl pmd example doc.
Liang Ma (8):
event/opdl: add the opdl ring infrastructure library
event/opdl: add the opdl pmd main body and helper function
eventdev/opdl: opdl eventdev pmd unit test function
lib/librte_eventdev: extend the eventdev capability flags
event/*: apply the three new capability flags for sw/dppa2/octeontx
maintainers: add the opdl pmd maintainer information
doc:update 18.02 release notes
doc: add eventdev opdl pmd docuement
MAINTAINERS | 6 +
config/common_base | 6 +
doc/guides/eventdevs/index.rst | 1 +
doc/guides/eventdevs/opdl.rst | 162 +++
doc/guides/rel_notes/release_18_02.rst | 11 +
drivers/event/Makefile | 1 +
drivers/event/dpaa2/dpaa2_eventdev.c | 6 +-
drivers/event/octeontx/ssovf_evdev.c | 6 +-
drivers/event/opdl/Makefile | 66 ++
drivers/event/opdl/opdl_evdev.c | 794 +++++++++++++
drivers/event/opdl/opdl_evdev.h | 342 ++++++
drivers/event/opdl/opdl_evdev_init.c | 963 ++++++++++++++++
drivers/event/opdl/opdl_evdev_xstats.c | 205 ++++
drivers/event/opdl/opdl_log.h | 59 +
drivers/event/opdl/opdl_ring.c | 1250 +++++++++++++++++++++
drivers/event/opdl/opdl_ring.h | 628 +++++++++++
drivers/event/opdl/opdl_test.c | 1079 ++++++++++++++++++
drivers/event/opdl/rte_pmd_evdev_opdl_version.map | 3 +
drivers/event/sw/sw_evdev.c | 5 +-
lib/librte_eventdev/rte_eventdev.h | 22 +
mk/rte.app.mk | 1 +
mk/toolchain/gcc/rte.toolchain-compat.mk | 6 +
mk/toolchain/icc/rte.toolchain-compat.mk | 6 +
23 files changed, 5625 insertions(+), 3 deletions(-)
create mode 100644 doc/guides/eventdevs/opdl.rst
create mode 100644 drivers/event/opdl/Makefile
create mode 100644 drivers/event/opdl/opdl_evdev.c
create mode 100644 drivers/event/opdl/opdl_evdev.h
create mode 100644 drivers/event/opdl/opdl_evdev_init.c
create mode 100644 drivers/event/opdl/opdl_evdev_xstats.c
create mode 100644 drivers/event/opdl/opdl_log.h
create mode 100644 drivers/event/opdl/opdl_ring.c
create mode 100644 drivers/event/opdl/opdl_ring.h
create mode 100644 drivers/event/opdl/opdl_test.c
create mode 100644 drivers/event/opdl/rte_pmd_evdev_opdl_version.map
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