net: ipa: stash modem TX and RX endpoints

Rather than repeatedly looking up the endpoints in the name map,
save the modem TX and RX endpoint pointers in the netdev private
area.
Signed-off-by: Alex Elder <elder@linaro.org>
Link: https://lore.kernel.org/r/20240130192305.250915-2-elder@linaro.orgSigned-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ipa/ipa_modem.c

@@ -39,10 +39,14 @@ enum ipa_modem_state {
 /**
  * struct ipa_priv - IPA network device private data
  * @ipa:	IPA pointer
+ * @tx:		Transmit endpoint pointer
+ * @rx:		Receive endpoint pointer
  * @work:	Work structure used to wake the modem netdev TX queue
  */
 struct ipa_priv {
 	struct ipa *ipa;
+	struct ipa_endpoint *tx;
+	struct ipa_endpoint *rx;
 	struct work_struct work;
 };
 
@@ -59,11 +63,11 @@ static int ipa_open(struct net_device *netdev)
 	if (ret < 0)
 		goto err_power_put;
 
-	ret = ipa_endpoint_enable_one(ipa->name_map[IPA_ENDPOINT_AP_MODEM_TX]);
+	ret = ipa_endpoint_enable_one(priv->tx);
 	if (ret)
 		goto err_power_put;
 
-	ret = ipa_endpoint_enable_one(ipa->name_map[IPA_ENDPOINT_AP_MODEM_RX]);
+	ret = ipa_endpoint_enable_one(priv->rx);
 	if (ret)
 		goto err_disable_tx;
 
@@ -75,7 +79,7 @@ static int ipa_open(struct net_device *netdev)
 	return 0;
 
 err_disable_tx:
-	ipa_endpoint_disable_one(ipa->name_map[IPA_ENDPOINT_AP_MODEM_TX]);
+	ipa_endpoint_disable_one(priv->tx);
 err_power_put:
 	pm_runtime_put_noidle(dev);
 
@@ -97,8 +101,8 @@ static int ipa_stop(struct net_device *netdev)
 
 	netif_stop_queue(netdev);
 
-	ipa_endpoint_disable_one(ipa->name_map[IPA_ENDPOINT_AP_MODEM_RX]);
-	ipa_endpoint_disable_one(ipa->name_map[IPA_ENDPOINT_AP_MODEM_TX]);
+	ipa_endpoint_disable_one(priv->rx);
+	ipa_endpoint_disable_one(priv->tx);
 out_power_put:
 	pm_runtime_mark_last_busy(dev);
 	(void)pm_runtime_put_autosuspend(dev);
@@ -233,14 +237,14 @@ static void ipa_modem_netdev_setup(struct net_device *netdev)
  */
 void ipa_modem_suspend(struct net_device *netdev)
 {
-	struct ipa_priv *priv = netdev_priv(netdev);
-	struct ipa *ipa = priv->ipa;
+	struct ipa_priv *priv;
 
 	if (!(netdev->flags & IFF_UP))
 		return;
 
-	ipa_endpoint_suspend_one(ipa->name_map[IPA_ENDPOINT_AP_MODEM_RX]);
-	ipa_endpoint_suspend_one(ipa->name_map[IPA_ENDPOINT_AP_MODEM_TX]);
+	priv = netdev_priv(netdev);
+	ipa_endpoint_suspend_one(priv->rx);
+	ipa_endpoint_suspend_one(priv->tx);
 }
 
 /**
@@ -268,14 +272,14 @@ static void ipa_modem_wake_queue_work(struct work_struct *work)
  */
 void ipa_modem_resume(struct net_device *netdev)
 {
-	struct ipa_priv *priv = netdev_priv(netdev);
-	struct ipa *ipa = priv->ipa;
+	struct ipa_priv *priv;
 
 	if (!(netdev->flags & IFF_UP))
 		return;
 
-	ipa_endpoint_resume_one(ipa->name_map[IPA_ENDPOINT_AP_MODEM_TX]);
-	ipa_endpoint_resume_one(ipa->name_map[IPA_ENDPOINT_AP_MODEM_RX]);
+	priv = netdev_priv(netdev);
+	ipa_endpoint_resume_one(priv->tx);
+	ipa_endpoint_resume_one(priv->rx);
 
 	/* Arrange for the TX queue to be restarted */
 	(void)queue_pm_work(&priv->work);
@@ -306,16 +310,21 @@ int ipa_modem_start(struct ipa *ipa)
 	SET_NETDEV_DEV(netdev, &ipa->pdev->dev);
 	priv = netdev_priv(netdev);
 	priv->ipa = ipa;
+	priv->tx = ipa->name_map[IPA_ENDPOINT_AP_MODEM_TX];
+	priv->rx = ipa->name_map[IPA_ENDPOINT_AP_MODEM_RX];
 	INIT_WORK(&priv->work, ipa_modem_wake_queue_work);
-	ipa->name_map[IPA_ENDPOINT_AP_MODEM_TX]->netdev = netdev;
-	ipa->name_map[IPA_ENDPOINT_AP_MODEM_RX]->netdev = netdev;
+
+	priv->tx->netdev = netdev;
+	priv->rx->netdev = netdev;
+
 	ipa->modem_netdev = netdev;
 
 	ret = register_netdev(netdev);
 	if (ret) {
 		ipa->modem_netdev = NULL;
-		ipa->name_map[IPA_ENDPOINT_AP_MODEM_RX]->netdev = NULL;
-		ipa->name_map[IPA_ENDPOINT_AP_MODEM_TX]->netdev = NULL;
+		priv->rx->netdev = NULL;
+		priv->tx->netdev = NULL;
+
 		free_netdev(netdev);
 	}
 
@@ -355,9 +364,11 @@ int ipa_modem_stop(struct ipa *ipa)
 		if (netdev->flags & IFF_UP)
 			(void)ipa_stop(netdev);
 		unregister_netdev(netdev);
+
 		ipa->modem_netdev = NULL;
-		ipa->name_map[IPA_ENDPOINT_AP_MODEM_RX]->netdev = NULL;
-		ipa->name_map[IPA_ENDPOINT_AP_MODEM_TX]->netdev = NULL;
+		priv->rx->netdev = NULL;
+		priv->tx->netdev = NULL;
+
 		free_netdev(netdev);
 	}