mlxsw: pci: Implement LAG processing for received packets

Completion queue element for receive queue provides information if the
packet was received via LAG port. Extract this info and pass it along
to core.
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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

@@ -686,12 +686,14 @@ static void mlxsw_pci_cqe_rdq_handle(struct mlxsw_pci *mlxsw_pci,
 	if (q->consumer_counter++ != consumer_counter_limit)
 		dev_dbg_ratelimited(&pdev->dev, "Consumer counter does not match limit in RDQ\n");
 
-	/* We do not support lag now */
-	if (mlxsw_pci_cqe_lag_get(cqe))
-		goto drop;
-
-	rx_info.is_lag = false;
-	rx_info.u.sys_port = mlxsw_pci_cqe_system_port_get(cqe);
+	if (mlxsw_pci_cqe_lag_get(cqe)) {
+		rx_info.is_lag = true;
+		rx_info.u.lag_id = mlxsw_pci_cqe_lag_id_get(cqe);
+		rx_info.lag_port_index = mlxsw_pci_cqe_lag_port_index_get(cqe);
+	} else {
+		rx_info.is_lag = false;
+		rx_info.u.sys_port = mlxsw_pci_cqe_system_port_get(cqe);
+	}
 
 	rx_info.trap_id = mlxsw_pci_cqe_trap_id_get(cqe);
 
@@ -701,7 +703,6 @@ static void mlxsw_pci_cqe_rdq_handle(struct mlxsw_pci *mlxsw_pci,
 	skb_put(skb, byte_count);
 	mlxsw_core_skb_receive(mlxsw_pci->core, skb, &rx_info);
 
-put_new_skb:
 	memset(wqe, 0, q->elem_size);
 	err = mlxsw_pci_rdq_skb_alloc(mlxsw_pci, elem_info);
 	if (err)
@@ -710,10 +711,6 @@ static void mlxsw_pci_cqe_rdq_handle(struct mlxsw_pci *mlxsw_pci,
 	q->producer_counter++;
 	mlxsw_pci_queue_doorbell_producer_ring(mlxsw_pci, q);
 	return;
-
-drop:
-	dev_kfree_skb_any(skb);
-	goto put_new_skb;
 }
 
 static char *mlxsw_pci_cq_sw_cqe_get(struct mlxsw_pci_queue *q)

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

@@ -129,13 +129,15 @@ MLXSW_ITEM64_INDEXED(pci, wqe, address, 0x08, 0, 64, 0x8, 0x0, false);
  */
 MLXSW_ITEM32(pci, cqe, lag, 0x00, 23, 1);
 
-/* pci_cqe_system_port
+/* pci_cqe_system_port/lag_id
  * When lag=0: System port on which the packet was received
  * When lag=1:
  * bits [15:4] LAG ID on which the packet was received
  * bits [3:0] sub_port on which the packet was received
  */
 MLXSW_ITEM32(pci, cqe, system_port, 0x00, 0, 16);
+MLXSW_ITEM32(pci, cqe, lag_id, 0x00, 4, 12);
+MLXSW_ITEM32(pci, cqe, lag_port_index, 0x00, 0, 4);
 
 /* pci_cqe_wqe_counter
  * WQE count of the WQEs completed on the associated dqn