octeontx2-af: Modify SMQ flush sequence to drop packets

octeontx2-af: Modify SMQ flush sequence to drop packets

The current implementation of SMQ flush sequence waits for the packets
in the TM pipeline to be transmitted out of the link. This sequence
doesn't succeed in HW when there is any issue with link such as lack of
link credits, link down or any other traffic that is fully occupying the
link bandwidth (QoS). This patch modifies the SMQ flush sequence to
drop the packets after TL1 level (SQM) instead of polling for the packets
to be sent out of RPM/CGX link.

Fixes: 5d9b976d4480 ("octeontx2-af: Support fixed transmit scheduler topology")
Signed-off-by: Naveen Mamindlapalli <naveenm@marvell.com>
Reviewed-by: Sunil Kovvuri Goutham <sgoutham@marvell.com>
Link: https://patch.msgid.link/20240906045838.1620308-1-naveenm@marvell.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>