net: ena: Support persistent per-NAPI config.

JIRA: https://issues.redhat.com/browse/RHEL-94831

commit 0f681b0
Author: Kuniyuki Iwashima <kuniyu@amazon.com>
Date:   Mon Apr 7 09:47:59 2025 -0700

    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 <kuniyu@amazon.com>
    Reviewed-by: Joe Damato <jdamato@fastly.com>
    Reviewed-by: Arthur Kiyanovski <akiyano@amazon.com>
    Link: https://patch.msgid.link/20250407164802.25184-1-kuniyu@amazon.com
    Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Signed-off-by: Dennis Chen <dechen@redhat.com>

Author: dchen5022

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

@@ -1807,7 +1807,7 @@ 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;