1 // SPDX-License-Identifier: GPL-2.0
3 /* Copyright (c) 2014-2018, The Linux Foundation. All rights reserved.
4  * Copyright (C) 2018-2024 Linaro Ltd.
38  * struct ipa_priv - IPA network device private data
51 /** ipa_open() - Opens the modem network interface */
55 	struct ipa *ipa = priv->ipa;  in ipa_open()
59 	dev = ipa->dev;  in ipa_open()
64 	ret = ipa_endpoint_enable_one(priv->tx);  in ipa_open()
68 	ret = ipa_endpoint_enable_one(priv->rx);  in ipa_open()
80 	ipa_endpoint_disable_one(priv->tx);  in ipa_open()
87 /** ipa_stop() - Stops the modem network interface. */
91 	struct ipa *ipa = priv->ipa;  in ipa_stop()
95 	dev = ipa->dev;  in ipa_stop()
102 	ipa_endpoint_disable_one(priv->rx);  in ipa_stop()
103 	ipa_endpoint_disable_one(priv->tx);  in ipa_stop()
111 /** ipa_start_xmit() - Transmit an skb
125 	struct net_device_stats *stats = &netdev->stats;  in ipa_start_xmit()
128 	struct ipa *ipa = priv->ipa;  in ipa_start_xmit()
129 	u32 skb_len = skb->len;  in ipa_start_xmit()
136 	endpoint = ipa->name_map[IPA_ENDPOINT_AP_MODEM_TX];  in ipa_start_xmit()
137 	if (endpoint->config.qmap && skb->protocol != htons(ETH_P_MAP))  in ipa_start_xmit()
140 	/* The hardware must be powered for us to transmit, so if we're not  in ipa_start_xmit()
146 	 * If it was not, powering up is either started or already underway.  in ipa_start_xmit()
148 	 * re-enabled once power is ACTIVE.  But runtime PM and network  in ipa_start_xmit()
149 	 * transmit run concurrently, and if we're not careful the requests  in ipa_start_xmit()
159 	dev = ipa->dev;  in ipa_start_xmit()
163 		if (ret < 0 && ret != -EINPROGRESS) {  in ipa_start_xmit()
182 		if (ret != -E2BIG)  in ipa_start_xmit()
187 	stats->tx_packets++;  in ipa_start_xmit()
188 	stats->tx_bytes += skb_len;  in ipa_start_xmit()
194 	stats->tx_dropped++;  in ipa_start_xmit()
201 	struct net_device_stats *stats = &netdev->stats;  in ipa_modem_skb_rx()
204 		skb->dev = netdev;  in ipa_modem_skb_rx()
205 		skb->protocol = htons(ETH_P_MAP);  in ipa_modem_skb_rx()
206 		stats->rx_packets++;  in ipa_modem_skb_rx()
207 		stats->rx_bytes += skb->len;  in ipa_modem_skb_rx()
211 		stats->rx_dropped++;  in ipa_modem_skb_rx()
221 /** ipa_modem_netdev_setup() - netdev setup function for the modem */
224 	netdev->netdev_ops = &ipa_modem_ops;  in ipa_modem_netdev_setup()
226 	netdev->header_ops = NULL;  in ipa_modem_netdev_setup()
227 	netdev->type = ARPHRD_RAWIP;  in ipa_modem_netdev_setup()
228 	netdev->hard_header_len = 0;  in ipa_modem_netdev_setup()
229 	netdev->min_header_len = ETH_HLEN;  in ipa_modem_netdev_setup()
230 	netdev->min_mtu = ETH_MIN_MTU;  in ipa_modem_netdev_setup()
231 	netdev->max_mtu = IPA_MTU;  in ipa_modem_netdev_setup()
232 	netdev->mtu = netdev->max_mtu;  in ipa_modem_netdev_setup()
233 	netdev->addr_len = 0;  in ipa_modem_netdev_setup()
234 	netdev->tx_queue_len = DEFAULT_TX_QUEUE_LEN;  in ipa_modem_netdev_setup()
235 	netdev->flags &= ~(IFF_BROADCAST | IFF_MULTICAST);  in ipa_modem_netdev_setup()
236 	netdev->priv_flags |= IFF_TX_SKB_SHARING;  in ipa_modem_netdev_setup()
237 	eth_broadcast_addr(netdev->broadcast);  in ipa_modem_netdev_setup()
240 	netdev->needed_headroom = sizeof(struct rmnet_map_header);  in ipa_modem_netdev_setup()
241 	netdev->needed_tailroom = IPA_NETDEV_TAILROOM;  in ipa_modem_netdev_setup()
242 	netdev->watchdog_timeo = IPA_NETDEV_TIMEOUT * HZ;  in ipa_modem_netdev_setup()
243 	netdev->hw_features = NETIF_F_SG;  in ipa_modem_netdev_setup()
246 /** ipa_modem_suspend() - suspend callback
255 	if (!(netdev->flags & IFF_UP))  in ipa_modem_suspend()
259 	ipa_endpoint_suspend_one(priv->rx);  in ipa_modem_suspend()
260 	ipa_endpoint_suspend_one(priv->tx);  in ipa_modem_suspend()
264  * ipa_modem_wake_queue_work() - enable modem netdev queue
267  * Re-enable transmit on the modem network device.  This is called
278 	netif_wake_queue(priv->tx->netdev);  in ipa_modem_wake_queue_work()
281 /** ipa_modem_resume() - resume callback for runtime_pm
290 	if (!(netdev->flags & IFF_UP))  in ipa_modem_resume()
294 	ipa_endpoint_resume_one(priv->tx);  in ipa_modem_resume()
295 	ipa_endpoint_resume_one(priv->rx);  in ipa_modem_resume()
298 	(void)queue_pm_work(&priv->work);  in ipa_modem_resume()
309 	state = atomic_cmpxchg(&ipa->modem_state, IPA_MODEM_STATE_STOPPED,  in ipa_modem_start()
319 		ret = -ENOMEM;  in ipa_modem_start()
323 	SET_NETDEV_DEV(netdev, ipa->dev);  in ipa_modem_start()
325 	priv->ipa = ipa;  in ipa_modem_start()
326 	priv->tx = ipa->name_map[IPA_ENDPOINT_AP_MODEM_TX];  in ipa_modem_start()
327 	priv->rx = ipa->name_map[IPA_ENDPOINT_AP_MODEM_RX];  in ipa_modem_start()
328 	INIT_WORK(&priv->work, ipa_modem_wake_queue_work);  in ipa_modem_start()
330 	priv->tx->netdev = netdev;  in ipa_modem_start()
331 	priv->rx->netdev = netdev;  in ipa_modem_start()
333 	ipa->modem_netdev = netdev;  in ipa_modem_start()
337 		ipa->modem_netdev = NULL;  in ipa_modem_start()
338 		priv->rx->netdev = NULL;  in ipa_modem_start()
339 		priv->tx->netdev = NULL;  in ipa_modem_start()
346 		atomic_set(&ipa->modem_state, IPA_MODEM_STATE_STOPPED);  in ipa_modem_start()
348 		atomic_set(&ipa->modem_state, IPA_MODEM_STATE_RUNNING);  in ipa_modem_start()
356 	struct net_device *netdev = ipa->modem_netdev;  in ipa_modem_stop()
360 	state = atomic_cmpxchg(&ipa->modem_state, IPA_MODEM_STATE_RUNNING,  in ipa_modem_stop()
367 	/* If we're somewhere between stopped and starting, we're busy */  in ipa_modem_stop()
369 		return -EBUSY;  in ipa_modem_stop()
371 	/* Clean up the netdev and endpoints if it was started */  in ipa_modem_stop()
375 		cancel_work_sync(&priv->work);  in ipa_modem_stop()
377 		if (netdev->flags & IFF_UP)  in ipa_modem_stop()
381 		ipa->modem_netdev = NULL;  in ipa_modem_stop()
382 		priv->rx->netdev = NULL;  in ipa_modem_stop()
383 		priv->tx->netdev = NULL;  in ipa_modem_stop()
388 	atomic_set(&ipa->modem_state, IPA_MODEM_STATE_STOPPED);  in ipa_modem_stop()
397 	struct device *dev = ipa->dev;  in ipa_modem_crashed()
444 	struct device *dev = ipa->dev;  in ipa_modem_notify()
459 			 notify_data->crashed ? "crashed" : "stopping");  in ipa_modem_notify()
460 		if (ipa->setup_complete)  in ipa_modem_notify()
480 	ipa->nb.notifier_call = ipa_modem_notify;  in ipa_modem_config()
482 	notifier = qcom_register_ssr_notifier("mpss", &ipa->nb);  in ipa_modem_config()
486 	ipa->notifier = notifier;  in ipa_modem_config()
493 	struct device *dev = ipa->dev;  in ipa_modem_deconfig()
496 	ret = qcom_unregister_ssr_notifier(ipa->notifier, &ipa->nb);  in ipa_modem_deconfig()
500 	ipa->notifier = NULL;  in ipa_modem_deconfig()
501 	memset(&ipa->nb, 0, sizeof(ipa->nb));  in ipa_modem_deconfig()