linux-kernel - [net-next v3 2/2] tg3: Link queues to NAPIs

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Message-Id: <20241005145717.302575-3-jdamato@fastly.com>
Date: Sat,  5 Oct 2024 14:57:17 +0000
From: Joe Damato <jdamato@...tly.com>
To: netdev@...r.kernel.org
Cc: Joe Damato <jdamato@...tly.com>,
	Pavan Chebbi <pavan.chebbi@...adcom.com>,
	Michael Chan <mchan@...adcom.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	linux-kernel@...r.kernel.org (open list)
Subject: [net-next v3 2/2] tg3: Link queues to NAPIs

Link queues to NAPIs using the netdev-genl API so this information is
queryable.

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

[{'id': 0, 'ifindex': 2, 'napi-id': 8194, 'type': 'rx'},
 {'id': 1, 'ifindex': 2, 'napi-id': 8195, 'type': 'rx'},
 {'id': 2, 'ifindex': 2, 'napi-id': 8196, 'type': 'rx'},
 {'id': 3, 'ifindex': 2, 'napi-id': 8197, 'type': 'rx'},
 {'id': 0, 'ifindex': 2, 'napi-id': 8193, 'type': 'tx'}]

Signed-off-by: Joe Damato <jdamato@...tly.com>
---
 drivers/net/ethernet/broadcom/tg3.c | 37 +++++++++++++++++++++++++----
 1 file changed, 33 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/tg3.c b/drivers/net/ethernet/broadcom/tg3.c
index 6564072b47ba..12172783b9b6 100644
--- a/drivers/net/ethernet/broadcom/tg3.c
+++ b/drivers/net/ethernet/broadcom/tg3.c
@@ -7395,18 +7395,47 @@ static int tg3_poll(struct napi_struct *napi, int budget)
 
 static void tg3_napi_disable(struct tg3 *tp)
 {
+	int txq_idx = tp->txq_cnt - 1;
+	int rxq_idx = tp->rxq_cnt - 1;
+	struct tg3_napi *tnapi;
 	int i;
 
-	for (i = tp->irq_cnt - 1; i >= 0; i--)
-		napi_disable(&tp->napi[i].napi);
+	for (i = tp->irq_cnt - 1; i >= 0; i--) {
+		tnapi = &tp->napi[i];
+		if (tnapi->tx_buffers) {
+			netif_queue_set_napi(tp->dev, txq_idx,
+					     NETDEV_QUEUE_TYPE_TX, NULL);
+			txq_idx--;
+		} else if (tnapi->rx_rcb) {
+			netif_queue_set_napi(tp->dev, rxq_idx,
+					     NETDEV_QUEUE_TYPE_RX, NULL);
+			rxq_idx--;
+		}
+		napi_disable(&tnapi->napi);
+	}
 }
 
 static void tg3_napi_enable(struct tg3 *tp)
 {
+	int txq_idx = 0, rxq_idx = 0;
+	struct tg3_napi *tnapi;
 	int i;
 
-	for (i = 0; i < tp->irq_cnt; i++)
-		napi_enable(&tp->napi[i].napi);
+	for (i = 0; i < tp->irq_cnt; i++) {
+		tnapi = &tp->napi[i];
+		napi_enable(&tnapi->napi);
+		if (tnapi->tx_buffers) {
+			netif_queue_set_napi(tp->dev, txq_idx,
+					     NETDEV_QUEUE_TYPE_TX,
+					     &tnapi->napi);
+			txq_idx++;
+		} else if (tnapi->rx_rcb) {
+			netif_queue_set_napi(tp->dev, rxq_idx,
+					     NETDEV_QUEUE_TYPE_RX,
+					     &tnapi->napi);
+			rxq_idx++;
+		}
+	}
 }
 
 static void tg3_napi_init(struct tg3 *tp)
-- 
2.25.1