igb: Add support for persistent NAPI config

Use netif_napi_add_config() to assign persistent per-NAPI config.

This is useful for preserving NAPI settings when changing queue counts or
for user space programs using SO_INCOMING_NAPI_ID.

Reviewed-by: Joe Damato <[email protected]>
Reviewed-by: Aleksandr Loktionov <[email protected]>
Tested-by: Rinitha S <[email protected]> (A Contingent worker at Intel)
Signed-off-by: Kurt Kanzenbach <[email protected]>
Signed-off-by: Tony Nguyen <[email protected]>

Author: shifty91

drivers/net/ethernet/intel/igb/igb_main.c

@@ -1197,7 +1197,8 @@ static int igb_alloc_q_vector(struct igb_adapter *adapter,
 		return -ENOMEM;
 
 	/* initialize NAPI */
-	netif_napi_add(adapter->netdev, &q_vector->napi, igb_poll);
+	netif_napi_add_config(adapter->netdev, &q_vector->napi, igb_poll,
+			      v_idx);
 
 	/* tie q_vector and adapter together */
 	adapter->q_vector[v_idx] = q_vector;