> > > Introduce a new API to retrieve the number of available free 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 <jer...@marvell.com> > > > --- > > > doc/guides/nics/features.rst | 10 ++++ > > > doc/guides/nics/features/default.ini | 1 + > > > lib/ethdev/ethdev_trace_points.c | 3 ++ > > > lib/ethdev/rte_ethdev.h | 78 ++++++++++++++++++++++++++++ > > > lib/ethdev/rte_ethdev_core.h | 7 ++- > > > lib/ethdev/rte_ethdev_trace_fp.h | 8 +++ > > > 6 files changed, 106 insertions(+), 1 deletion(-) > > > > Hi Jerin, > > Hi Cristian, > > > > > I think having an API to get the number of free descriptors per queue is a > > good idea. Why have it only for TX queues and not for RX > queues as well? > > I see no harm in adding for Rx as well. I think, it is better to have > separate API for each instead of adding argument as it is fast path > API. > If so, we could add a new API when there is any PMD implementation or > need for this.
I think for RX we already have similar one: /** @internal Get number of used descriptors on a receive queue. */ typedef uint32_t (*eth_rx_queue_count_t)(void *rxq);
