[v5,00/22] Add DLB PMD
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  • Add DLB PMD
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Timothy McDaniel Oct. 17, 2020, 7:03 p.m. UTC
The following patch series adds support for a new eventdev PMD. The DLB
PMD adds support for the Intel Dynamic Load Balancer (DLB) hardware.
The DLB is a PCIe device that provides load-balanced, prioritized
scheduling of core-to-core communication. The device consists of
queues and arbiters that connect producer and consumer cores, and
implements load-balanced queueing features including:
- Lock-free multi-producer/multi-consumer operation.
- Multiple priority levels for varying traffic types.
- 'Direct' traffic (i.e. multi-producer/single-consumer)
- Simple unordered load-balanced distribution.
- Atomic lock-free load balancing across multiple consumers.
- Queue element reordering feature allowing ordered load-balanced
  distribution.

The DLB hardware supports both load balanced and directed ports and
queues. Unlike other eventdev devices already in the repo,  not all
DLB ports and queues are equally capable. In particular, directed
ports are limited to a single link, and must be connected to a directed
queue.
Additionally, even though LDB ports may link multiple queues, the
number of queues that may be linked is limited by hardware. Another
difference is that DLB does not have a straightforward way of carrying
the flow_id in the queue elements (QE) that the hardware operates on.

While reviewing the code, please be aware that this PMD has full
control over the DLB hardware. Intel will be extending the DLB PMD
in the future (not as part of this first series) with a mode that we
refer to as the bifurcated PMD. The bifurcated PMD communicates with a
kernel driver to configure the device, ports, and queues, and memory
maps device MMIO so datapath operations occur purely in user-space.

The framework to support both the PF PMD and bifurcated PMD exists in
this patchset, and is why the iface.[ch] layer is present.

Major changes in v5 after dpdk reviews and additional internal reviews
by colleagues at Intel:
================
- implement changes requested in code reviews by Gage Eads and Mike Chen
- fix a memzone leak
- convert to use eal rte-cpuflags patch from Liang Ma

Major changes in v4 after dpdk reviews and additional internal reviews
by colleagues at Intel:
================
- Remove make infrastructure
- shared code (pf/base) is now added incrementally
- flexible interface (iface.[ch]) is now added incrementally
- removed calls to rte_panic
- do not call pthread_create directly
- remove unused internal API, os_time
- convert rte_atomic to __atomic builtins
- broke out eventdev ABI changes, test/api changes, and new internal PCI
  named probe API
- relocated enqueue logic to enqueue patch

Major Changes in V3:
================
- Fixed a memory corruption issue due to not allocating enough CQ
memory for depths < 8. Hardware requires minimum allocation to be
at least 8 entries.
- Address review comments from Gage and Mattias.
- Remove versioning
- minor formatting changes

Major changes in V2:
================
- Correct ABI break that was present in V1.
- Address some of the review comments received from Mattias.
  I will address the remaining items identified by Mattias in the next
  patch delivery.
- General code cleanup based on internal code reviews

Depends-on: patch-79539 ("eal: add new x86 cpuid support for WAITPKG")

Timothy McDaniel (22):
  event/dlb: add documentation and meson infrastructure
  event/dlb: add dynamic logging
  event/dlb: add private data structures and constants
  event/dlb: add definitions shared with LKM or shared code
  event/dlb: add inline functions
  event/dlb: add probe
  event/dlb: add xstats
  event/dlb: add infos get and configure
  event/dlb: add queue and port default conf
  event/dlb: add queue setup
  event/dlb: add port setup
  event/dlb: add port link
  event/dlb: add port unlink and port unlinks in progress
  event/dlb: add eventdev start
  event/dlb: add enqueue and its burst variants
  event/dlb: add dequeue and its burst variants
  event/dlb: add eventdev stop and close
  event/dlb: add PMD's token pop public interface
  event/dlb: add PMD self-tests
  event/dlb: add queue and port release
  event/dlb: add timeout ticks entry point
  doc: Add new DLB eventdev driver to relnotes

 MAINTAINERS                                     |    5 +
 app/test/test_eventdev.c                        |    7 +
 config/rte_config.h                             |    8 +-
 doc/api/doxy-api-index.md                       |    1 +
 doc/guides/eventdevs/dlb.rst                    |  341 ++
 doc/guides/eventdevs/index.rst                  |    1 +
 doc/guides/rel_notes/release_20_11.rst          |    5 +
 drivers/event/dlb/dlb.c                         | 4129 ++++++++++++++
 drivers/event/dlb/dlb_iface.c                   |   79 +
 drivers/event/dlb/dlb_iface.h                   |   82 +
 drivers/event/dlb/dlb_inline_fns.h              |   79 +
 drivers/event/dlb/dlb_log.h                     |   25 +
 drivers/event/dlb/dlb_priv.h                    |  513 ++
 drivers/event/dlb/dlb_selftest.c                | 1551 +++++
 drivers/event/dlb/dlb_user.h                    |  814 +++
 drivers/event/dlb/dlb_xstats.c                  | 1222 ++++
 drivers/event/dlb/meson.build                   |   15 +
 drivers/event/dlb/pf/base/dlb_hw_types.h        |  334 ++
 drivers/event/dlb/pf/base/dlb_osdep.h           |  326 ++
 drivers/event/dlb/pf/base/dlb_osdep_bitmap.h    |  441 ++
 drivers/event/dlb/pf/base/dlb_osdep_list.h      |  131 +
 drivers/event/dlb/pf/base/dlb_osdep_types.h     |   31 +
 drivers/event/dlb/pf/base/dlb_regs.h            | 2368 ++++++++
 drivers/event/dlb/pf/base/dlb_resource.c        | 6902 +++++++++++++++++++++++
 drivers/event/dlb/pf/base/dlb_resource.h        |  876 +++
 drivers/event/dlb/pf/dlb_main.c                 |  591 ++
 drivers/event/dlb/pf/dlb_main.h                 |   52 +
 drivers/event/dlb/pf/dlb_pf.c                   |  746 +++
 drivers/event/dlb/rte_pmd_dlb.c                 |   38 +
 drivers/event/dlb/rte_pmd_dlb.h                 |   72 +
 drivers/event/dlb/rte_pmd_dlb_event_version.map |    9 +
 drivers/event/meson.build                       |    4 +
 32 files changed, 21797 insertions(+), 1 deletion(-)
 create mode 100644 doc/guides/eventdevs/dlb.rst
 create mode 100644 drivers/event/dlb/dlb.c
 create mode 100644 drivers/event/dlb/dlb_iface.c
 create mode 100644 drivers/event/dlb/dlb_iface.h
 create mode 100644 drivers/event/dlb/dlb_inline_fns.h
 create mode 100644 drivers/event/dlb/dlb_log.h
 create mode 100644 drivers/event/dlb/dlb_priv.h
 create mode 100644 drivers/event/dlb/dlb_selftest.c
 create mode 100644 drivers/event/dlb/dlb_user.h
 create mode 100644 drivers/event/dlb/dlb_xstats.c
 create mode 100644 drivers/event/dlb/meson.build
 create mode 100644 drivers/event/dlb/pf/base/dlb_hw_types.h
 create mode 100644 drivers/event/dlb/pf/base/dlb_osdep.h
 create mode 100644 drivers/event/dlb/pf/base/dlb_osdep_bitmap.h
 create mode 100644 drivers/event/dlb/pf/base/dlb_osdep_list.h
 create mode 100644 drivers/event/dlb/pf/base/dlb_osdep_types.h
 create mode 100644 drivers/event/dlb/pf/base/dlb_regs.h
 create mode 100644 drivers/event/dlb/pf/base/dlb_resource.c
 create mode 100644 drivers/event/dlb/pf/base/dlb_resource.h
 create mode 100644 drivers/event/dlb/pf/dlb_main.c
 create mode 100644 drivers/event/dlb/pf/dlb_main.h
 create mode 100644 drivers/event/dlb/pf/dlb_pf.c
 create mode 100644 drivers/event/dlb/rte_pmd_dlb.c
 create mode 100644 drivers/event/dlb/rte_pmd_dlb.h
 create mode 100644 drivers/event/dlb/rte_pmd_dlb_event_version.map