[dpdk-dev] [v1] ethdev: support Tx queue used count

[Jerin Jacob]

On Fri, Jan 12, 2024 at 1:33 PM David Marchand
<david.marchand at redhat.com> wrote:
>
> Hi Jerin,
>
> On Thu, Jan 11, 2024 at 4:32 PM <jerinj at marvell.com> wrote:
> >
> > From: Jerin Jacob <jerinj at marvell.com>
> >
> > Introduce a new API to retrieve the number of used descriptors
> > in a Tx queue. Applications can leverage this API in the fast path to
> > inspect the Tx queue occupancy and take appropriate actions based on the
> > available free descriptors.
> >
> > A notable use case could be implementing Random Early Discard (RED)
> > in software based on Tx queue occupancy.
> >
> > Signed-off-by: Jerin Jacob <jerinj at marvell.com>
> > ---
> >  doc/guides/nics/features.rst         | 10 ++++
> >  doc/guides/nics/features/default.ini |  1 +
> >  lib/ethdev/ethdev_driver.h           |  2 +
> >  lib/ethdev/ethdev_private.c          |  1 +
> >  lib/ethdev/ethdev_trace_points.c     |  3 ++
> >  lib/ethdev/rte_ethdev.h              | 74 ++++++++++++++++++++++++++++
> >  lib/ethdev/rte_ethdev_core.h         |  7 ++-
> >  lib/ethdev/rte_ethdev_trace_fp.h     |  8 +++
> >  lib/ethdev/version.map               |  3 ++
> >  9 files changed, 108 insertions(+), 1 deletion(-)
>
> We need some libabigail suppression rule for the reserved2 field update.
> Looking at some previous rules, something like below can do the trick.
>
> diff --git a/devtools/libabigail.abignore b/devtools/libabigail.abignore
> index 21b8cd6113..ba240f74d5 100644
> --- a/devtools/libabigail.abignore
> +++ b/devtools/libabigail.abignore
> @@ -33,3 +33,6 @@
>  ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
>  ; Temporary exceptions till next major ABI version ;
>  ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
> +[suppress_type]
> +        name = rte_eth_fp_ops
> +        has_data_member_inserted_between = {offset_of(reserved2), end}

Thanks David. will fix in v2.


>
> --
> David Marchand
>