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octeontx2-pf: cn20k: Add TC rules support

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Unlike previous silicons, MCAM entries required for TC rules in CN20K
are allocated dynamically. The key size can also be dynamic, i.e., X2 or
X4. Based on the size of the TC rule match criteria, the AF driver
allocates an X2 or X4 rule. This patch implements the required changes
for CN20K TC by requesting an MCAM entry from the AF driver on the fly
when the user installs a rule. Based on the TC rule priority added or
deleted by the user, the PF driver shifts MCAM entries accordingly. If
there is a mix of X2 and X4 rules and the user tries to install a rule
in the middle of existing rules, the PF driver detects this and rejects
the rule since X2 and X4 rules cannot be shifted in hardware.

Signed-off-by: Subbaraya Sundeep <sbhatta@marvell.com>
Signed-off-by: Ratheesh Kannoth <rkannoth@marvell.com>
Link: https://patch.msgid.link/20260224080009.4147301-12-rkannoth@marvell.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Subbaraya Sundeep 2026-02-24 13:30:07 +05:30 • committed by Jakub Kicinski
commit 0d12d26701
5 changed files with 361 additions and 38 deletions
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