linux-kernel - [net-next v2 2/2] gve: Map NAPI instances to queues

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Message-ID: <20240930210731.1629-3-jdamato@fastly.com>
Date: Mon, 30 Sep 2024 21:07:08 +0000
From: Joe Damato <jdamato@...tly.com>
To: netdev@...r.kernel.org
Cc: pkaligineedi@...gle.com,
	horms@...nel.org,
	Joe Damato <jdamato@...tly.com>,
	Jeroen de Borst <jeroendb@...gle.com>,
	Shailend Chand <shailend@...gle.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Willem de Bruijn <willemb@...gle.com>,
	Harshitha Ramamurthy <hramamurthy@...gle.com>,
	Ziwei Xiao <ziweixiao@...gle.com>,
	linux-kernel@...r.kernel.org (open list)
Subject: [net-next v2 2/2] gve: Map NAPI instances to queues

Use the netdev-genl interface to map NAPI instances to queues so that
this information is accessible to user programs via netlink.

$ ./tools/net/ynl/cli.py --spec Documentation/netlink/specs/netdev.yaml \
			 --dump queue-get --json='{"ifindex": 2}'

[{'id': 0, 'ifindex': 2, 'napi-id': 8313, 'type': 'rx'},
 {'id': 1, 'ifindex': 2, 'napi-id': 8314, 'type': 'rx'},
 {'id': 2, 'ifindex': 2, 'napi-id': 8315, 'type': 'rx'},
 {'id': 3, 'ifindex': 2, 'napi-id': 8316, 'type': 'rx'},
 {'id': 4, 'ifindex': 2, 'napi-id': 8317, 'type': 'rx'},
[...]
 {'id': 0, 'ifindex': 2, 'napi-id': 8297, 'type': 'tx'},
 {'id': 1, 'ifindex': 2, 'napi-id': 8298, 'type': 'tx'},
 {'id': 2, 'ifindex': 2, 'napi-id': 8299, 'type': 'tx'},
 {'id': 3, 'ifindex': 2, 'napi-id': 8300, 'type': 'tx'},
 {'id': 4, 'ifindex': 2, 'napi-id': 8301, 'type': 'tx'},
[...]

Signed-off-by: Joe Damato <jdamato@...tly.com>
---
 v2:
   - Check that idx < priv->tx_cfg.num_queues in both gve_turnup and
     gve_turndown as suggested by Praveen Kaligineedi

 drivers/net/ethernet/google/gve/gve_main.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/drivers/net/ethernet/google/gve/gve_main.c b/drivers/net/ethernet/google/gve/gve_main.c
index 661566db68c8..294ddcd0bf6c 100644
--- a/drivers/net/ethernet/google/gve/gve_main.c
+++ b/drivers/net/ethernet/google/gve/gve_main.c
@@ -1875,6 +1875,11 @@ static void gve_turndown(struct gve_priv *priv)
 
 		if (!gve_tx_was_added_to_block(priv, idx))
 			continue;
+
+		if (idx < priv->tx_cfg.num_queues)
+			netif_queue_set_napi(priv->dev, idx,
+					     NETDEV_QUEUE_TYPE_TX, NULL);
+
 		napi_disable(&block->napi);
 	}
 	for (idx = 0; idx < priv->rx_cfg.num_queues; idx++) {
@@ -1883,6 +1888,9 @@ static void gve_turndown(struct gve_priv *priv)
 
 		if (!gve_rx_was_added_to_block(priv, idx))
 			continue;
+
+		netif_queue_set_napi(priv->dev, idx, NETDEV_QUEUE_TYPE_RX,
+				     NULL);
 		napi_disable(&block->napi);
 	}
 
@@ -1909,6 +1917,12 @@ static void gve_turnup(struct gve_priv *priv)
 			continue;
 
 		napi_enable(&block->napi);
+
+		if (idx < priv->tx_cfg.num_queues)
+			netif_queue_set_napi(priv->dev, idx,
+					     NETDEV_QUEUE_TYPE_TX,
+					     &block->napi);
+
 		if (gve_is_gqi(priv)) {
 			iowrite32be(0, gve_irq_doorbell(priv, block));
 		} else {
@@ -1931,6 +1945,9 @@ static void gve_turnup(struct gve_priv *priv)
 			continue;
 
 		napi_enable(&block->napi);
+		netif_queue_set_napi(priv->dev, idx, NETDEV_QUEUE_TYPE_RX,
+				     &block->napi);
+
 		if (gve_is_gqi(priv)) {
 			iowrite32be(0, gve_irq_doorbell(priv, block));
 		} else {
-- 
2.43.0