net: ena: Support persistent per-NAPI config.

Let's pass the queue index to netif_napi_add_config() to preserve
per-NAPI config.

Test:

Set 100 to defer-hard-irqs (default is 0) and check the value after
link down & up.

  $ cat /sys/class/net/enp39s0/napi_defer_hard_irqs
  0

  $ ./tools/net/ynl/pyynl/cli.py --spec Documentation/netlink/specs/netdev.yaml \
    --dump napi-get --json='{"ifindex": 2}'
  [{'defer-hard-irqs': 0,
    'gro-flush-timeout': 0,
    'id': 65,
    'ifindex': 2,
    'irq': 29,
    'irq-suspend-timeout': 0}]

  $ sudo ./tools/net/ynl/pyynl/cli.py --spec Documentation/netlink/specs/netdev.yaml \
    --do napi-set --json='{"id": 65, "defer-hard-irqs": 100}'

  $ sudo ip link set enp39s0 down && sudo ip link set enp39s0 up

Without patch:

  $ ./tools/net/ynl/pyynl/cli.py --spec Documentation/netlink/specs/netdev.yaml \
    --dump napi-get --json='{"ifindex": 2}'
  [{'defer-hard-irqs': 0,  <------------------- Reset to 0
    'gro-flush-timeout': 0,
    'id': 66,  <------------------------------- New ID
    'ifindex': 2,
    'irq': 29,
    'irq-suspend-timeout': 0}]

With patch:

  $ ./tools/net/ynl/pyynl/cli.py --spec Documentation/netlink/specs/netdev.yaml \
    --dump napi-get --json='{"ifindex": 2}'
  [{'defer-hard-irqs': 100,  <--------------+-- Preserved
    'gro-flush-timeout': 0,                 |
    'id': 65,  <----------------------------'
    'ifindex': 2,
    'irq': 29,
    'irq-suspend-timeout': 0}]

Signed-off-by: Kuniyuki Iwashima <[email protected]>
Reviewed-by: Joe Damato <[email protected]>
Reviewed-by: Arthur Kiyanovski <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>

Author: q2ven

drivers/net/ethernet/amazon/ena/ena_netdev.c

@@ -1777,7 +1777,7 @@ static void ena_init_napi_in_range(struct ena_adapter *adapter,
 		if (ENA_IS_XDP_INDEX(adapter, i))
 			napi_handler = ena_xdp_io_poll;
 
-		netif_napi_add(adapter->netdev, &napi->napi, napi_handler);
+		netif_napi_add_config(adapter->netdev, &napi->napi, napi_handler, i);
 
 		if (!ENA_IS_XDP_INDEX(adapter, i))
 			napi->rx_ring = rx_ring;