octeontx2-af: npc: cn20k: virtual index support

This patch adds support for virtual MCAM index allocation and
improves CN20K MCAM defragmentation handling. A new field is
introduced in the non-ref, non-contiguous MCAM allocation mailbox
request to indicate that virtual indexes should be returned instead
of physical ones. Virtual indexes allow the hardware to move mapped
MCAM entries internally, enabling defragmentation and preventing
scattered allocations across subbanks. The patch also enhances
defragmentation by treating non-ref, non-contiguous allocations as
ideal candidates for packing sparsely used regions, which can free
up subbanks for potential x2 or x4 configuration. All such
allocations are tracked and always returned as virtual indexes so
they remain stable even when entries are moved during defrag.
During defragmentation, MCAM entries may shift between subbanks,
but their virtual indexes remain unchanged. Additionally, this
update fixes an issue where entry statistics were not being
restored correctly after defragmentation.

Signed-off-by: Ratheesh Kannoth <rkannoth@marvell.com>
Link: https://patch.msgid.link/20260224080009.4147301-10-rkannoth@marvell.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

0 files changed, 0 insertions, 0 deletions