Octeontx2-af: Introduce mode group index

Kernel and firmware communicates via scratch register which is
64 bit in size.

[MODE_ID   PORT    AUTONEG  DUPLEX  SPEED   CMD_ID   OWNERSHIP ]
 63-22     21-14     13      12      11-8    7-2       1-0

The existing MODE_ID bitmap can only support up to 42 modes.
To resolve the issue, the unused port field is modified as below
            uint64_t reserved2:6;
            uint64_t mode_group_idx:2;

'mode_group_idx' categorize the mode ID range to accommodate more modes.

	To specify mode ID range of 0 - 41, this field will be 0.

    	To specify mode ID range of 42 - 83, this field will be 1.

mode ID will be still mentioned as 1 << (0 - 41).  But the mode_group_idx
decides the actual mode range

Signed-off-by: Hariprasad Kelam <hkelam@marvell.com>
Link: https://patch.msgid.link/20250625092107.9746-3-hkelam@marvell.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

3 files changed, 22 insertions, 4 deletions

diff --git a/drivers/net/ethernet/marvell/octeontx2/af/cgx.c b/drivers/net/ethernet/marvell/octeontx2/af/cgx.c
index ac30b6dcb5e5..5c2435f39308 100644
--- a/drivers/net/ethernet/marvell/octeontx2/af/cgx.c
+++ b/drivers/net/ethernet/marvell/octeontx2/af/cgx.c
@@ -1182,6 +1182,9 @@ static int cgx_link_usertable_index_map(int speed)
 static void set_mod_args(struct cgx_set_link_mode_args *args,
 			 u32 speed, u8 duplex, u8 autoneg, u64 mode)
 {
+	int mode_baseidx;
+	u8 cgx_mode;
+
 	/* Fill default values incase of user did not pass
 	 * valid parameters
 	 */
@@ -1191,8 +1194,18 @@ static void set_mod_args(struct cgx_set_link_mode_args *args,
 		args->speed = speed;
 	if (args->an == AUTONEG_UNKNOWN)
 		args->an = autoneg;
+
+	/* Derive mode_base_idx and mode fields based
+	 * on cgx_mode value
+	 */
+	cgx_mode = find_first_bit((unsigned long *)&mode,
+				  CGX_MODE_MAX);
 	args->mode = mode;
-	args->ports = 0;
+	mode_baseidx = cgx_mode - 41;
+	if (mode_baseidx > 0) {
+		args->mode_baseidx = 1;
+		args->mode = BIT_ULL(mode_baseidx);
+	}
 }
 
 static void otx2_map_ethtool_link_modes(u64 bitmask,
@@ -1499,7 +1512,7 @@ int cgx_set_link_mode(void *cgxd, struct cgx_set_link_mode_args args,
 			cgx_link_usertable_index_map(args.speed), req);
 	req = FIELD_SET(CMDMODECHANGE_DUPLEX, args.duplex, req);
 	req = FIELD_SET(CMDMODECHANGE_AN, args.an, req);
-	req = FIELD_SET(CMDMODECHANGE_PORT, args.ports, req);
+	req = FIELD_SET(CMDMODECHANGE_MODE_BASEIDX, args.mode_baseidx, req);
 	req = FIELD_SET(CMDMODECHANGE_FLAGS, args.mode, req);
 
 	return cgx_fwi_cmd_generic(req, &resp, cgx, lmac_id);
diff --git a/drivers/net/ethernet/marvell/octeontx2/af/cgx_fw_if.h b/drivers/net/ethernet/marvell/octeontx2/af/cgx_fw_if.h
index da21a6f847cf..39352d451cc3 100644
--- a/drivers/net/ethernet/marvell/octeontx2/af/cgx_fw_if.h
+++ b/drivers/net/ethernet/marvell/octeontx2/af/cgx_fw_if.h
@@ -282,7 +282,12 @@ struct cgx_lnk_sts {
 #define CMDMODECHANGE_SPEED		GENMASK_ULL(11, 8)
 #define CMDMODECHANGE_DUPLEX		GENMASK_ULL(12, 12)
 #define CMDMODECHANGE_AN		GENMASK_ULL(13, 13)
-#define CMDMODECHANGE_PORT		GENMASK_ULL(21, 14)
+/* this field categorize the mode ID(FLAGS) range to accommodate
+ * more modes.
+ * To specify mode ID range of 0 - 41, this field will be 0.
+ * To specify mode ID range of 42 - 83, this field will be 1.
+ */
+#define CMDMODECHANGE_MODE_BASEIDX	GENMASK_ULL(21, 20)
 #define CMDMODECHANGE_FLAGS		GENMASK_ULL(63, 22)
 
 /* LINK_BRING_UP command timeout */
diff --git a/drivers/net/ethernet/marvell/octeontx2/af/mbox.h b/drivers/net/ethernet/marvell/octeontx2/af/mbox.h
index b3562d658d45..2fc6b0ba7494 100644
--- a/drivers/net/ethernet/marvell/octeontx2/af/mbox.h
+++ b/drivers/net/ethernet/marvell/octeontx2/af/mbox.h
@@ -675,7 +675,7 @@ struct cgx_set_link_mode_args {
 	u32 speed;
 	u8 duplex;
 	u8 an;
-	u8 ports;
+	u8 mode_baseidx;
 	u64 mode;
 };