mlxsw: spectrum_ptp: Add PTP initialization / finalization for Spectrum-2

Lay the groundwork for Spectrum-2 support. On Spectrum-2, the packets get
the time stamps from the CQE, which means that the time stamp is attached
to its packet.

Configure MTPTPT to set which message types should arrive under which
PTP trap. PTP0 will be used for event message types, which means that
the packets require time stamp. PTP1 will be used for other packets.

Note that in Spectrum-2, all packets contain time stamp by default. The two
types of traps (PTP0, PTP1) will be used to separate between PTP_EVENT
traps and PTP_GENERAL traps, so then the driver will fill the time stamp as
part of the SKB only for event message types.

Later the driver will enable the traps using 'MTPCPC.ptp_trap_en' bit.
Then, PTP packets start arriving through the PTP traps.

Currently, the structure 'mlxsw_sp2_ptp_state' contains only the common
structure, the next patches will extend it.
Signed-off-by: Danielle Ratson <danieller@nvidia.com>
Signed-off-by: Amit Cohen <amcohen@nvidia.com>
Reviewed-by: Petr Machata <petrm@nvidia.com>
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/mellanox/mlxsw/spectrum_ptp.c

@@ -39,6 +39,10 @@ struct mlxsw_sp1_ptp_state {
 	u32 gc_cycle;
 };
 
+struct mlxsw_sp2_ptp_state {
+	struct mlxsw_sp_ptp_state common;
+};
+
 struct mlxsw_sp1_ptp_key {
 	u16 local_port;
 	u8 message_type;
@@ -85,6 +89,13 @@ mlxsw_sp1_ptp_state(struct mlxsw_sp *mlxsw_sp)
 			    common);
 }
 
+static struct mlxsw_sp2_ptp_state *
+mlxsw_sp2_ptp_state(struct mlxsw_sp *mlxsw_sp)
+{
+	return container_of(mlxsw_sp->ptp_state, struct mlxsw_sp2_ptp_state,
+			    common);
+}
+
 static struct mlxsw_sp1_ptp_clock *
 mlxsw_sp1_ptp_clock(struct ptp_clock_info *ptp)
 {
@@ -1194,3 +1205,36 @@ void mlxsw_sp1_get_stats(struct mlxsw_sp_port *mlxsw_sp_port,
 		*data++ = *(u64 *)(stats + offset);
 	}
 }
+
+struct mlxsw_sp_ptp_state *mlxsw_sp2_ptp_init(struct mlxsw_sp *mlxsw_sp)
+{
+	struct mlxsw_sp2_ptp_state *ptp_state;
+	int err;
+
+	ptp_state = kzalloc(sizeof(*ptp_state), GFP_KERNEL);
+	if (!ptp_state)
+		return ERR_PTR(-ENOMEM);
+
+	ptp_state->common.mlxsw_sp = mlxsw_sp;
+
+	err = mlxsw_sp_ptp_traps_set(mlxsw_sp);
+	if (err)
+		goto err_ptp_traps_set;
+
+	return &ptp_state->common;
+
+err_ptp_traps_set:
+	kfree(ptp_state);
+	return ERR_PTR(err);
+}
+
+void mlxsw_sp2_ptp_fini(struct mlxsw_sp_ptp_state *ptp_state_common)
+{
+	struct mlxsw_sp *mlxsw_sp = ptp_state_common->mlxsw_sp;
+	struct mlxsw_sp2_ptp_state *ptp_state;
+
+	ptp_state = mlxsw_sp2_ptp_state(mlxsw_sp);
+
+	mlxsw_sp_ptp_traps_unset(mlxsw_sp);
+	kfree(ptp_state);
+}

drivers/net/ethernet/mellanox/mlxsw/spectrum_ptp.h

@@ -57,6 +57,9 @@ void mlxsw_sp1_get_stats_strings(u8 **p);
 void mlxsw_sp1_get_stats(struct mlxsw_sp_port *mlxsw_sp_port,
 			 u64 *data, int data_index);
 
+struct mlxsw_sp_ptp_state *mlxsw_sp2_ptp_init(struct mlxsw_sp *mlxsw_sp);
+
+void mlxsw_sp2_ptp_fini(struct mlxsw_sp_ptp_state *ptp_state);
 #else
 
 static inline struct mlxsw_sp_ptp_clock *
@@ -136,25 +139,25 @@ static inline void mlxsw_sp1_get_stats(struct mlxsw_sp_port *mlxsw_sp_port,
 				       u64 *data, int data_index)
 {
 }
-#endif
 
-static inline struct mlxsw_sp_ptp_clock *
-mlxsw_sp2_ptp_clock_init(struct mlxsw_sp *mlxsw_sp, struct device *dev)
+static inline struct mlxsw_sp_ptp_state *
+mlxsw_sp2_ptp_init(struct mlxsw_sp *mlxsw_sp)
 {
 	return NULL;
 }
 
-static inline void mlxsw_sp2_ptp_clock_fini(struct mlxsw_sp_ptp_clock *clock)
+static inline void mlxsw_sp2_ptp_fini(struct mlxsw_sp_ptp_state *ptp_state)
 {
 }
+#endif
 
-static inline struct mlxsw_sp_ptp_state *
-mlxsw_sp2_ptp_init(struct mlxsw_sp *mlxsw_sp)
+static inline struct mlxsw_sp_ptp_clock *
+mlxsw_sp2_ptp_clock_init(struct mlxsw_sp *mlxsw_sp, struct device *dev)
 {
 	return NULL;
 }
 
-static inline void mlxsw_sp2_ptp_fini(struct mlxsw_sp_ptp_state *ptp_state)
+static inline void mlxsw_sp2_ptp_clock_fini(struct mlxsw_sp_ptp_clock *clock)
 {
 }