tsnep: Link queues to NAPIs

Use netif_queue_set_napi() to link queues to NAPI instances so that they
can be queried with netlink.

$ ./tools/net/ynl/cli.py --spec Documentation/netlink/specs/netdev.yaml \
                         --dump queue-get --json='{"ifindex": 11}'
[{'id': 0, 'ifindex': 11, 'napi-id': 9, 'type': 'rx'},
 {'id': 1, 'ifindex': 11, 'napi-id': 10, 'type': 'rx'},
 {'id': 0, 'ifindex': 11, 'napi-id': 9, 'type': 'tx'},
 {'id': 1, 'ifindex': 11, 'napi-id': 10, 'type': 'tx'}]

Additionally use netif_napi_set_irq() to also provide NAPI interrupt
number to userspace.

$ ./tools/net/ynl/cli.py --spec Documentation/netlink/specs/netdev.yaml \
                         --do napi-get --json='{"id": 9}'
{'defer-hard-irqs': 0,
 'gro-flush-timeout': 0,
 'id': 9,
 'ifindex': 11,
 'irq': 42,
 'irq-suspend-timeout': 0}

Providing information about queues to userspace makes sense as APIs like
XSK provide queue specific access. Also XSK busy polling relies on
queues linked to NAPIs.

Signed-off-by: Gerhard Engleder <gerhard@engleder-embedded.com>
Reviewed-by: Alexander Lobakin <aleksander.lobakin@intel.com>
Link: https://patch.msgid.link/20250110223939.37490-1-gerhard@engleder-embedded.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/drivers/net/ethernet/engleder/tsnep_main.c b/drivers/net/ethernet/engleder/tsnep_main.c
index 95a5295d0361840a717ce81f5e87496fdddad78b..0d030cb0b21c74446b86c903c67793a3c9292d29 100644 (file)
--- a/drivers/net/ethernet/engleder/tsnep_main.c
+++ b/drivers/net/ethernet/engleder/tsnep_main.c
@@ -1966,23 +1966,41 @@ failed:
 
 static void tsnep_queue_enable(struct tsnep_queue *queue)
 {
+       struct tsnep_adapter *adapter = queue->adapter;
+
+       netif_napi_set_irq(&queue->napi, queue->irq);
        napi_enable(&queue->napi);
-       tsnep_enable_irq(queue->adapter, queue->irq_mask);
+       tsnep_enable_irq(adapter, queue->irq_mask);
 
-       if (queue->tx)
+       if (queue->tx) {
+               netif_queue_set_napi(adapter->netdev, queue->tx->queue_index,
+                                    NETDEV_QUEUE_TYPE_TX, &queue->napi);
                tsnep_tx_enable(queue->tx);
+       }
 
-       if (queue->rx)
+       if (queue->rx) {
+               netif_queue_set_napi(adapter->netdev, queue->rx->queue_index,
+                                    NETDEV_QUEUE_TYPE_RX, &queue->napi);
                tsnep_rx_enable(queue->rx);
+       }
 }
 
 static void tsnep_queue_disable(struct tsnep_queue *queue)
 {
-       if (queue->tx)
+       struct tsnep_adapter *adapter = queue->adapter;
+
+       if (queue->rx)
+               netif_queue_set_napi(adapter->netdev, queue->rx->queue_index,
+                                    NETDEV_QUEUE_TYPE_RX, NULL);
+
+       if (queue->tx) {
                tsnep_tx_disable(queue->tx, &queue->napi);
+               netif_queue_set_napi(adapter->netdev, queue->tx->queue_index,
+                                    NETDEV_QUEUE_TYPE_TX, NULL);
+       }
 
        napi_disable(&queue->napi);
-       tsnep_disable_irq(queue->adapter, queue->irq_mask);
+       tsnep_disable_irq(adapter, queue->irq_mask);
 
        /* disable RX after NAPI polling has been disabled, because RX can be
         * enabled during NAPI polling