[EXT] Re: [PATCH v4 0/3] Introduce event link profiles

[Pavan Nikhilesh Bhagavatula]

> On Thu, Sep 28, 2023 at 3:42 PM <pbhagavatula at marvell.com> wrote:
> >
> > From: Pavan Nikhilesh <pbhagavatula at marvell.com>
> 
> + @Thomas Monjalon  @David Marchand  @Aaron Conole  @Michael
> Santana
> 
> There is CI failure in apply stage[1] where it is taking main tree
> commit. Not sure why it is taking main tree?
> 
> Pavan,
> 
> Could you resend this series  again to give one more chance to CI.
> 
> 
> [1]
> https://urldefense.proofpoint.com/v2/url?u=https-
> 3A__patches.dpdk.org_project_dpdk_patch_20230928101205.4352-2D2-
> 2Dpbhagavatula-
> 40marvell.com_&d=DwIFaQ&c=nKjWec2b6R0mOyPaz7xtfQ&r=E3SgYMjtKC
> MVsB-fmvgGV3o-g_fjLhk5Pupi9ijohpc&m=s0pyfDe0ZocDrutPG-
> dljjgkODjEcIJ2NEAbull1QXuFTK1wlg4H42nArfxOqW29&s=h8P-
> KWtqiKfO0rinRfnUMFHtuGEFZp2fku5fG6xu3uY&e=
> 
> 

The CI script which decides the tree to run tests on needs an update when 
a series contains a spec change followed by driver implementation, 
I submitted the following patch to ci at dpdk.org

https://patches.dpdk.org/project/ci/patch/20230929083443.9925-1-pbhagavatula@marvell.com/

> 
> >
> > A collection of event queues linked to an event port can be associated
> > with unique identifier called as a link profile, multiple such profiles
> > can be configured based on the event device capability using the function
> > `rte_event_port_profile_links_set` which takes arguments similar to
> > `rte_event_port_link` in addition to the profile identifier.
> >
> > The maximum link profiles that are supported by an event device is
> > advertised through the structure member
> > `rte_event_dev_info::max_profiles_per_port`.
> >
> > By default, event ports are configured to use the link profile 0 on
> > initialization.
> >
> > Once multiple link profiles are set up and the event device is started, the
> > application can use the function `rte_event_port_profile_switch` to change
> > the currently active profile on an event port. This effects the next
> > `rte_event_dequeue_burst` call, where the event queues associated with
> the
> > newly active link profile will participate in scheduling.
> >
> > Rudementary work flow would something like:
> >
> > Config path:
> >
> >     uint8_t lq[4] = {4, 5, 6, 7};
> >     uint8_t hq[4] = {0, 1, 2, 3};
> >
> >     if (rte_event_dev_info.max_profiles_per_port < 2)
> >         return -ENOTSUP;
> >
> >     rte_event_port_profile_links_set(0, 0, hq, NULL, 4, 0);
> >     rte_event_port_profile_links_set(0, 0, lq, NULL, 4, 1);
> >
> > Worker path:
> >
> >     empty_high_deq = 0;
> >     empty_low_deq = 0;
> >     is_low_deq = 0;
> >     while (1) {
> >         deq = rte_event_dequeue_burst(0, 0, &ev, 1, 0);
> >         if (deq == 0) {
> >             /**
> >              * Change link profile based on work activity on current
> >              * active profile
> >              */
> >             if (is_low_deq) {
> >                 empty_low_deq++;
> >                 if (empty_low_deq == MAX_LOW_RETRY) {
> >                     rte_event_port_profile_switch(0, 0, 0);
> >                     is_low_deq = 0;
> >                     empty_low_deq = 0;
> >                 }
> >                 continue;
> >             }
> >
> >             if (empty_high_deq == MAX_HIGH_RETRY) {
> >                 rte_event_port_profile_switch(0, 0, 1);
> >                 is_low_deq = 1;
> >                 empty_high_deq = 0;
> >             }
> >             continue;
> >         }
> >
> >         // Process the event received.
> >
> >         if (is_low_deq++ == MAX_LOW_EVENTS) {
> >             rte_event_port_profile_switch(0, 0, 0);
> >             is_low_deq = 0;
> >         }
> >     }
> >
> > An application could use heuristic data of load/activity of a given event
> > port and change its active profile to adapt to the traffic pattern.
> >
> > An unlink function `rte_event_port_profile_unlink` is provided to
> > modify the links associated to a profile, and
> > `rte_event_port_profile_links_get` can be used to retrieve the links
> > associated with a profile.
> >
> > Using Link profiles can reduce the overhead of linking/unlinking and
> > waiting for unlinks in progress in fast-path and gives applications
> > the ability to switch between preset profiles on the fly.
> >
> > v4 Changes:
> > ----------
> > - Address review comments (Jerin).
> >
> > v3 Changes:
> > ----------
> > - Rebase to next-eventdev
> > - Rename testcase name to match API.
> >
> > v2 Changes:
> > ----------
> > - Fix compilation.
> >
> > Pavan Nikhilesh (3):
> >   eventdev: introduce link profiles
> >   event/cnxk: implement event link profiles
> >   test/event: add event link profile test
> >
> >  app/test/test_eventdev.c                  | 117 +++++++++++
> >  config/rte_config.h                       |   1 +
> >  doc/guides/eventdevs/cnxk.rst             |   1 +
> >  doc/guides/eventdevs/features/cnxk.ini    |   3 +-
> >  doc/guides/eventdevs/features/default.ini |   1 +
> >  doc/guides/prog_guide/eventdev.rst        |  40 ++++
> >  doc/guides/rel_notes/release_23_11.rst    |  14 +-
> >  drivers/common/cnxk/roc_nix_inl_dev.c     |   4 +-
> >  drivers/common/cnxk/roc_sso.c             |  18 +-
> >  drivers/common/cnxk/roc_sso.h             |   8 +-
> >  drivers/common/cnxk/roc_sso_priv.h        |   4 +-
> >  drivers/event/cnxk/cn10k_eventdev.c       |  45 +++--
> >  drivers/event/cnxk/cn10k_worker.c         |  11 ++
> >  drivers/event/cnxk/cn10k_worker.h         |   1 +
> >  drivers/event/cnxk/cn9k_eventdev.c        |  74 ++++---
> >  drivers/event/cnxk/cn9k_worker.c          |  22 +++
> >  drivers/event/cnxk/cn9k_worker.h          |   2 +
> >  drivers/event/cnxk/cnxk_eventdev.c        |  37 ++--
> >  drivers/event/cnxk/cnxk_eventdev.h        |  10 +-
> >  lib/eventdev/eventdev_pmd.h               |  59 +++++-
> >  lib/eventdev/eventdev_private.c           |   9 +
> >  lib/eventdev/eventdev_trace.h             |  32 +++
> >  lib/eventdev/eventdev_trace_points.c      |  12 ++
> >  lib/eventdev/rte_eventdev.c               | 150 +++++++++++---
> >  lib/eventdev/rte_eventdev.h               | 231 ++++++++++++++++++++++
> >  lib/eventdev/rte_eventdev_core.h          |   6 +-
> >  lib/eventdev/rte_eventdev_trace_fp.h      |   8 +
> >  lib/eventdev/version.map                  |   4 +
> >  28 files changed, 814 insertions(+), 110 deletions(-)
> >
> > --
> > 2.25.1
> >