mlxsw: spectrum: Report extra metadata to psample module

Make use of the previously added metadata and report it to the psample
module. The metadata is read from the skb's control block, which was
initialized by the bus driver (i.e., 'mlxsw_pci') after decoding the
packet's Completion Queue Element (CQE).

Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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

@@ -204,6 +204,55 @@ static void mlxsw_sp_rx_ptp_listener(struct sk_buff *skb, u8 local_port,
 	mlxsw_sp_ptp_receive(mlxsw_sp, skb, local_port);
 }
 
+static struct mlxsw_sp_port *
+mlxsw_sp_sample_tx_port_get(struct mlxsw_sp *mlxsw_sp,
+			    const struct mlxsw_rx_md_info *rx_md_info)
+{
+	u8 local_port;
+
+	if (!rx_md_info->tx_port_valid)
+		return NULL;
+
+	if (rx_md_info->tx_port_is_lag)
+		local_port = mlxsw_core_lag_mapping_get(mlxsw_sp->core,
+							rx_md_info->tx_lag_id,
+							rx_md_info->tx_lag_port_index);
+	else
+		local_port = rx_md_info->tx_sys_port;
+
+	if (local_port >= mlxsw_core_max_ports(mlxsw_sp->core))
+		return NULL;
+
+	return mlxsw_sp->ports[local_port];
+}
+
+/* The latency units are determined according to MOGCR.mirror_latency_units. It
+ * defaults to 64 nanoseconds.
+ */
+#define MLXSW_SP_MIRROR_LATENCY_SHIFT	6
+
+static void mlxsw_sp_psample_md_init(struct mlxsw_sp *mlxsw_sp,
+				     struct psample_metadata *md,
+				     struct sk_buff *skb, int in_ifindex,
+				     bool truncate, u32 trunc_size)
+{
+	struct mlxsw_rx_md_info *rx_md_info = &mlxsw_skb_cb(skb)->rx_md_info;
+	struct mlxsw_sp_port *mlxsw_sp_port;
+
+	md->trunc_size = truncate ? trunc_size : skb->len;
+	md->in_ifindex = in_ifindex;
+	mlxsw_sp_port = mlxsw_sp_sample_tx_port_get(mlxsw_sp, rx_md_info);
+	md->out_ifindex = mlxsw_sp_port && mlxsw_sp_port->dev ?
+			  mlxsw_sp_port->dev->ifindex : 0;
+	md->out_tc_valid = rx_md_info->tx_tc_valid;
+	md->out_tc = rx_md_info->tx_tc;
+	md->out_tc_occ_valid = rx_md_info->tx_congestion_valid;
+	md->out_tc_occ = rx_md_info->tx_congestion;
+	md->latency_valid = rx_md_info->latency_valid;
+	md->latency = rx_md_info->latency;
+	md->latency <<= MLXSW_SP_MIRROR_LATENCY_SHIFT;
+}
+
 static void mlxsw_sp_rx_sample_listener(struct sk_buff *skb, u8 local_port,
 					void *trap_ctx)
 {
@@ -229,8 +278,9 @@ static void mlxsw_sp_rx_sample_listener(struct sk_buff *skb, u8 local_port,
 	 * Ethernet header.
 	 */
 	skb_push(skb, ETH_HLEN);
-	md.trunc_size = sample->truncate ? sample->trunc_size : skb->len;
-	md.in_ifindex = mlxsw_sp_port->dev->ifindex;
+	mlxsw_sp_psample_md_init(mlxsw_sp, &md, skb,
+				 mlxsw_sp_port->dev->ifindex, sample->truncate,
+				 sample->trunc_size);
 	psample_sample_packet(sample->psample_group, skb, sample->rate, &md);
 out:
 	consume_skb(skb);