[PATCH v3 net 05/11] octeontx2-af: npc: cn20k: Align MCAM X2/X4 use with KEX profile

[Ratheesh Kannoth <rkannoth@marvell.com>]

Flow install derives whether an NPC MCAM line must be X2 or X4 from the
effective key width (>256 bits needs X4).  That is only valid when the
global KEX profile allows X4 keys; if the profile is X2-only, fail the
install with -EOPNOTSUPP instead of allocating a mismatched entry.
Default L2 rules allocation always requested X2 keys.  When npc_priv.kw
is X4, request X4 MCAM entries and wrap the reference index to the MCAM
bank depth so default rules match the active key mode.

Fixes: 9000cada7aa9 ("octeontx2-af: npc: cn20k: Allocate MCAM entry for flow installation")
Signed-off-by: Ratheesh Kannoth <rkannoth@marvell.com>
---
 .../net/ethernet/marvell/octeontx2/af/cn20k/npc.c    | 11 +++++++++--
 .../net/ethernet/marvell/octeontx2/af/rvu_npc_fs.c   | 12 +++++++++++-
 2 files changed, 20 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/marvell/octeontx2/af/cn20k/npc.c b/drivers/net/ethernet/marvell/octeontx2/af/cn20k/npc.c
index 97acba77ff88..74dad164b6a9 100644
--- a/drivers/net/ethernet/marvell/octeontx2/af/cn20k/npc.c
+++ b/drivers/net/ethernet/marvell/octeontx2/af/cn20k/npc.c
@@ -4328,11 +4328,18 @@ int npc_cn20k_dft_rules_alloc(struct rvu *rvu, u16 pcifunc)
 	 * as NPC_DFT_RULE_PRIO - 1 (higher hw priority)
 	 */
 	req.contig = false;
-	req.kw_type = NPC_MCAM_KEY_X2;
 	req.count = cnt;
 	req.hdr.pcifunc = pcifunc;
 	req.ref_prio = NPC_MCAM_LOWER_PRIO;
-	req.ref_entry = eidx + 1;
+
+	if (npc_priv.kw == NPC_MCAM_KEY_X4) {
+		req.kw_type = NPC_MCAM_KEY_X4;
+		req.ref_entry = eidx & (npc_priv.bank_depth - 1);
+	} else {
+		req.kw_type = NPC_MCAM_KEY_X2;
+		req.ref_entry = eidx;
+	}
+
 	ret = rvu_mbox_handler_npc_mcam_alloc_entry(rvu, &req, &rsp);
 	if (ret) {
 		dev_err(rvu->dev,
diff --git a/drivers/net/ethernet/marvell/octeontx2/af/rvu_npc_fs.c b/drivers/net/ethernet/marvell/octeontx2/af/rvu_npc_fs.c
index fe10554b1f0e..dd5d50d52964 100644
--- a/drivers/net/ethernet/marvell/octeontx2/af/rvu_npc_fs.c
+++ b/drivers/net/ethernet/marvell/octeontx2/af/rvu_npc_fs.c
@@ -1663,9 +1663,11 @@ rvu_npc_alloc_entry_for_flow_install(struct rvu *rvu,
 {
 	struct npc_mcam_alloc_entry_req entry_req;
 	struct npc_mcam_alloc_entry_rsp entry_rsp;
+	struct npc_get_pfl_info_rsp rsp = { 0 };
 	struct npc_get_num_kws_req kws_req;
 	struct npc_get_num_kws_rsp kws_rsp;
 	int off, kw_bits, rc;
+	struct msg_req req;
 	u8 *src, *dst;
 
 	if (!is_cn20k(rvu->pdev)) {
@@ -1689,8 +1691,16 @@ rvu_npc_alloc_entry_for_flow_install(struct rvu *rvu,
 	kw_bits = kws_rsp.kws * 64;
 
 	*kw_type = NPC_MCAM_KEY_X2;
-	if (kw_bits > 256)
+	if (kw_bits > 256) {
+		rvu_mbox_handler_npc_get_pfl_info(rvu, &req, &rsp);
+		if (rsp.kw_type == NPC_MCAM_KEY_X2) {
+			dev_err(rvu->dev,
+				"Only X2 entries are supported in X2 profile\n");
+			return -EOPNOTSUPP;
+		}
+
 		*kw_type = NPC_MCAM_KEY_X4;
+	}
 
 	memset(&entry_req, 0, sizeof(entry_req));
 	memset(&entry_rsp, 0, sizeof(entry_rsp));
-- 
2.43.0