1// SPDX-License-Identifier: ISC
2/*
3 * Copyright (c) 2012-2017 Qualcomm Atheros, Inc.
4 * Copyright (c) 2018-2019, The Linux Foundation. All rights reserved.
5 */
6
7#include <linux/etherdevice.h>
8#include <linux/rtnetlink.h>
9#include "wil6210.h"
10#include "txrx.h"
11
12bool wil_has_other_active_ifaces(struct wil6210_priv *wil,
13				 struct net_device *ndev, bool up, bool ok)
14{
15	int i;
16	struct wil6210_vif *vif;
17	struct net_device *ndev_i;
18
19	for (i = 0; i < GET_MAX_VIFS(wil); i++) {
20		vif = wil->vifs[i];
21		if (vif) {
22			ndev_i = vif_to_ndev(vif);
23			if (ndev_i != ndev)
24				if ((up && (ndev_i->flags & IFF_UP)) ||
25				    (ok && netif_carrier_ok(ndev_i)))
26					return true;
27		}
28	}
29
30	return false;
31}
32
33bool wil_has_active_ifaces(struct wil6210_priv *wil, bool up, bool ok)
34{
35	/* use NULL ndev argument to check all interfaces */
36	return wil_has_other_active_ifaces(wil, NULL, up, ok);
37}
38
39static int wil_open(struct net_device *ndev)
40{
41	struct wil6210_priv *wil = ndev_to_wil(ndev);
42	int rc = 0;
43
44	wil_dbg_misc(wil, "open\n");
45
46	if (debug_fw ||
47	    test_bit(WMI_FW_CAPABILITY_WMI_ONLY, wil->fw_capabilities)) {
48		wil_err(wil, "while in debug_fw or wmi_only mode\n");
49		return -EINVAL;
50	}
51
52	if (!wil_has_other_active_ifaces(wil, ndev, true, false)) {
53		wil_dbg_misc(wil, "open, first iface\n");
54		rc = wil_pm_runtime_get(wil);
55		if (rc < 0)
56			return rc;
57
58		rc = wil_up(wil);
59		if (rc)
60			wil_pm_runtime_put(wil);
61	}
62
63	return rc;
64}
65
66static int wil_stop(struct net_device *ndev)
67{
68	struct wil6210_priv *wil = ndev_to_wil(ndev);
69	int rc = 0;
70
71	wil_dbg_misc(wil, "stop\n");
72
73	if (!wil_has_other_active_ifaces(wil, ndev, true, false)) {
74		wil_dbg_misc(wil, "stop, last iface\n");
75		rc = wil_down(wil);
76		if (!rc)
77			wil_pm_runtime_put(wil);
78	}
79
80	return rc;
81}
82
83static const struct net_device_ops wil_netdev_ops = {
84	.ndo_open		= wil_open,
85	.ndo_stop		= wil_stop,
86	.ndo_start_xmit		= wil_start_xmit,
87	.ndo_set_mac_address	= eth_mac_addr,
88	.ndo_validate_addr	= eth_validate_addr,
89};
90
91static int wil6210_netdev_poll_rx(struct napi_struct *napi, int budget)
92{
93	struct wil6210_priv *wil = container_of(napi, struct wil6210_priv,
94						napi_rx);
95	int quota = budget;
96	int done;
97
98	wil_rx_handle(wil, &quota);
99	done = budget - quota;
100
101	if (done < budget) {
102		napi_complete_done(napi, done);
103		wil6210_unmask_irq_rx(wil);
104		wil_dbg_txrx(wil, "NAPI RX complete\n");
105	}
106
107	wil_dbg_txrx(wil, "NAPI RX poll(%d) done %d\n", budget, done);
108
109	return done;
110}
111
112static int wil6210_netdev_poll_rx_edma(struct napi_struct *napi, int budget)
113{
114	struct wil6210_priv *wil = container_of(napi, struct wil6210_priv,
115						napi_rx);
116	int quota = budget;
117	int done;
118
119	wil_rx_handle_edma(wil, &quota);
120	done = budget - quota;
121
122	if (done < budget) {
123		napi_complete_done(napi, done);
124		wil6210_unmask_irq_rx_edma(wil);
125		wil_dbg_txrx(wil, "NAPI RX complete\n");
126	}
127
128	wil_dbg_txrx(wil, "NAPI RX poll(%d) done %d\n", budget, done);
129
130	return done;
131}
132
133static int wil6210_netdev_poll_tx(struct napi_struct *napi, int budget)
134{
135	struct wil6210_priv *wil = container_of(napi, struct wil6210_priv,
136						napi_tx);
137	int tx_done = 0;
138	uint i;
139
140	/* always process ALL Tx complete, regardless budget - it is fast */
141	for (i = 0; i < WIL6210_MAX_TX_RINGS; i++) {
142		struct wil_ring *ring = &wil->ring_tx[i];
143		struct wil_ring_tx_data *txdata = &wil->ring_tx_data[i];
144		struct wil6210_vif *vif;
145
146		if (!ring->va || !txdata->enabled ||
147		    txdata->mid >= GET_MAX_VIFS(wil))
148			continue;
149
150		vif = wil->vifs[txdata->mid];
151		if (unlikely(!vif)) {
152			wil_dbg_txrx(wil, "Invalid MID %d\n", txdata->mid);
153			continue;
154		}
155
156		tx_done += wil_tx_complete(vif, i);
157	}
158
159	if (tx_done < budget) {
160		napi_complete(napi);
161		wil6210_unmask_irq_tx(wil);
162		wil_dbg_txrx(wil, "NAPI TX complete\n");
163	}
164
165	wil_dbg_txrx(wil, "NAPI TX poll(%d) done %d\n", budget, tx_done);
166
167	return min(tx_done, budget);
168}
169
170static int wil6210_netdev_poll_tx_edma(struct napi_struct *napi, int budget)
171{
172	struct wil6210_priv *wil = container_of(napi, struct wil6210_priv,
173						napi_tx);
174	int tx_done;
175	/* There is only one status TX ring */
176	struct wil_status_ring *sring = &wil->srings[wil->tx_sring_idx];
177
178	if (!sring->va)
179		return 0;
180
181	tx_done = wil_tx_sring_handler(wil, sring);
182
183	if (tx_done < budget) {
184		napi_complete(napi);
185		wil6210_unmask_irq_tx_edma(wil);
186		wil_dbg_txrx(wil, "NAPI TX complete\n");
187	}
188
189	wil_dbg_txrx(wil, "NAPI TX poll(%d) done %d\n", budget, tx_done);
190
191	return min(tx_done, budget);
192}
193
194static void wil_dev_setup(struct net_device *dev)
195{
196	ether_setup(dev);
197	dev->max_mtu = mtu_max;
198	dev->tx_queue_len = WIL_TX_Q_LEN_DEFAULT;
199}
200
201static void wil_vif_deinit(struct wil6210_vif *vif)
202{
203	del_timer_sync(&vif->scan_timer);
204	del_timer_sync(&vif->p2p.discovery_timer);
205	cancel_work_sync(&vif->disconnect_worker);
206	cancel_work_sync(&vif->p2p.discovery_expired_work);
207	cancel_work_sync(&vif->p2p.delayed_listen_work);
208	wil_probe_client_flush(vif);
209	cancel_work_sync(&vif->probe_client_worker);
210	cancel_work_sync(&vif->enable_tx_key_worker);
211}
212
213void wil_vif_free(struct wil6210_vif *vif)
214{
215	struct net_device *ndev = vif_to_ndev(vif);
216
217	wil_vif_deinit(vif);
218	free_netdev(ndev);
219}
220
221static void wil_ndev_destructor(struct net_device *ndev)
222{
223	struct wil6210_vif *vif = ndev_to_vif(ndev);
224
225	wil_vif_deinit(vif);
226}
227
228static void wil_connect_timer_fn(struct timer_list *t)
229{
230	struct wil6210_vif *vif = from_timer(vif, t, connect_timer);
231	struct wil6210_priv *wil = vif_to_wil(vif);
232	bool q;
233
234	wil_err(wil, "Connect timeout detected, disconnect station\n");
235
236	/* reschedule to thread context - disconnect won't
237	 * run from atomic context.
238	 * queue on wmi_wq to prevent race with connect event.
239	 */
240	q = queue_work(wil->wmi_wq, &vif->disconnect_worker);
241	wil_dbg_wmi(wil, "queue_work of disconnect_worker -> %d\n", q);
242}
243
244static void wil_scan_timer_fn(struct timer_list *t)
245{
246	struct wil6210_vif *vif = from_timer(vif, t, scan_timer);
247	struct wil6210_priv *wil = vif_to_wil(vif);
248
249	clear_bit(wil_status_fwready, wil->status);
250	wil_err(wil, "Scan timeout detected, start fw error recovery\n");
251	wil_fw_error_recovery(wil);
252}
253
254static void wil_p2p_discovery_timer_fn(struct timer_list *t)
255{
256	struct wil6210_vif *vif = from_timer(vif, t, p2p.discovery_timer);
257	struct wil6210_priv *wil = vif_to_wil(vif);
258
259	wil_dbg_misc(wil, "p2p_discovery_timer_fn\n");
260
261	schedule_work(&vif->p2p.discovery_expired_work);
262}
263
264static void wil_vif_init(struct wil6210_vif *vif)
265{
266	vif->bcast_ring = -1;
267
268	mutex_init(&vif->probe_client_mutex);
269
270	timer_setup(&vif->connect_timer, wil_connect_timer_fn, 0);
271	timer_setup(&vif->scan_timer, wil_scan_timer_fn, 0);
272	timer_setup(&vif->p2p.discovery_timer, wil_p2p_discovery_timer_fn, 0);
273
274	INIT_WORK(&vif->probe_client_worker, wil_probe_client_worker);
275	INIT_WORK(&vif->disconnect_worker, wil_disconnect_worker);
276	INIT_WORK(&vif->p2p.discovery_expired_work, wil_p2p_listen_expired);
277	INIT_WORK(&vif->p2p.delayed_listen_work, wil_p2p_delayed_listen_work);
278	INIT_WORK(&vif->enable_tx_key_worker, wil_enable_tx_key_worker);
279
280	INIT_LIST_HEAD(&vif->probe_client_pending);
281
282	vif->net_queue_stopped = 1;
283}
284
285static u8 wil_vif_find_free_mid(struct wil6210_priv *wil)
286{
287	u8 i;
288
289	for (i = 0; i < GET_MAX_VIFS(wil); i++) {
290		if (!wil->vifs[i])
291			return i;
292	}
293
294	return U8_MAX;
295}
296
297struct wil6210_vif *
298wil_vif_alloc(struct wil6210_priv *wil, const char *name,
299	      unsigned char name_assign_type, enum nl80211_iftype iftype)
300{
301	struct net_device *ndev;
302	struct wireless_dev *wdev;
303	struct wil6210_vif *vif;
304	u8 mid;
305
306	mid = wil_vif_find_free_mid(wil);
307	if (mid == U8_MAX) {
308		wil_err(wil, "no available virtual interface\n");
309		return ERR_PTR(-EINVAL);
310	}
311
312	ndev = alloc_netdev(sizeof(*vif), name, name_assign_type,
313			    wil_dev_setup);
314	if (!ndev) {
315		dev_err(wil_to_dev(wil), "alloc_netdev failed\n");
316		return ERR_PTR(-ENOMEM);
317	}
318	if (mid == 0) {
319		wil->main_ndev = ndev;
320	} else {
321		ndev->priv_destructor = wil_ndev_destructor;
322		ndev->needs_free_netdev = true;
323	}
324
325	vif = ndev_to_vif(ndev);
326	vif->ndev = ndev;
327	vif->wil = wil;
328	vif->mid = mid;
329	wil_vif_init(vif);
330
331	wdev = &vif->wdev;
332	wdev->wiphy = wil->wiphy;
333	wdev->iftype = iftype;
334
335	ndev->netdev_ops = &wil_netdev_ops;
336	wil_set_ethtoolops(ndev);
337	ndev->ieee80211_ptr = wdev;
338	ndev->hw_features = NETIF_F_HW_CSUM | NETIF_F_RXCSUM |
339			    NETIF_F_SG | NETIF_F_GRO |
340			    NETIF_F_TSO | NETIF_F_TSO6;
341
342	ndev->features |= ndev->hw_features;
343	SET_NETDEV_DEV(ndev, wiphy_dev(wdev->wiphy));
344	wdev->netdev = ndev;
345	return vif;
346}
347
348void *wil_if_alloc(struct device *dev)
349{
350	struct wil6210_priv *wil;
351	struct wil6210_vif *vif;
352	int rc = 0;
353
354	wil = wil_cfg80211_init(dev);
355	if (IS_ERR(wil)) {
356		dev_err(dev, "wil_cfg80211_init failed\n");
357		return wil;
358	}
359
360	rc = wil_priv_init(wil);
361	if (rc) {
362		dev_err(dev, "wil_priv_init failed\n");
363		goto out_cfg;
364	}
365
366	wil_dbg_misc(wil, "if_alloc\n");
367
368	vif = wil_vif_alloc(wil, "wlan%d", NET_NAME_UNKNOWN,
369			    NL80211_IFTYPE_STATION);
370	if (IS_ERR(vif)) {
371		dev_err(dev, "wil_vif_alloc failed\n");
372		rc = -ENOMEM;
373		goto out_priv;
374	}
375
376	wil->radio_wdev = vif_to_wdev(vif);
377
378	return wil;
379
380out_priv:
381	wil_priv_deinit(wil);
382
383out_cfg:
384	wil_cfg80211_deinit(wil);
385
386	return ERR_PTR(rc);
387}
388
389void wil_if_free(struct wil6210_priv *wil)
390{
391	struct net_device *ndev = wil->main_ndev;
392
393	wil_dbg_misc(wil, "if_free\n");
394
395	if (!ndev)
396		return;
397
398	wil_priv_deinit(wil);
399
400	wil->main_ndev = NULL;
401	wil_ndev_destructor(ndev);
402	free_netdev(ndev);
403
404	wil_cfg80211_deinit(wil);
405}
406
407int wil_vif_add(struct wil6210_priv *wil, struct wil6210_vif *vif)
408{
409	struct net_device *ndev = vif_to_ndev(vif);
410	struct wireless_dev *wdev = vif_to_wdev(vif);
411	bool any_active = wil_has_active_ifaces(wil, true, false);
412	int rc;
413
414	ASSERT_RTNL();
415
416	if (wil->vifs[vif->mid]) {
417		dev_err(&ndev->dev, "VIF with mid %d already in use\n",
418			vif->mid);
419		return -EEXIST;
420	}
421	if (any_active && vif->mid != 0) {
422		rc = wmi_port_allocate(wil, vif->mid, ndev->dev_addr,
423				       wdev->iftype);
424		if (rc)
425			return rc;
426	}
427	rc = cfg80211_register_netdevice(ndev);
428	if (rc < 0) {
429		dev_err(&ndev->dev, "Failed to register netdev: %d\n", rc);
430		if (any_active && vif->mid != 0)
431			wmi_port_delete(wil, vif->mid);
432		return rc;
433	}
434
435	wil->vifs[vif->mid] = vif;
436	return 0;
437}
438
439int wil_if_add(struct wil6210_priv *wil)
440{
441	struct wiphy *wiphy = wil->wiphy;
442	struct net_device *ndev = wil->main_ndev;
443	struct wil6210_vif *vif = ndev_to_vif(ndev);
444	int rc;
445
446	wil_dbg_misc(wil, "entered");
447
448	strscpy(wiphy->fw_version, wil->fw_version, sizeof(wiphy->fw_version));
449
450	rc = wiphy_register(wiphy);
451	if (rc < 0) {
452		wil_err(wil, "failed to register wiphy, err %d\n", rc);
453		return rc;
454	}
455
456	init_dummy_netdev(&wil->napi_ndev);
457	if (wil->use_enhanced_dma_hw) {
458		netif_napi_add(&wil->napi_ndev, &wil->napi_rx,
459			       wil6210_netdev_poll_rx_edma);
460		netif_napi_add_tx(&wil->napi_ndev,
461				  &wil->napi_tx, wil6210_netdev_poll_tx_edma);
462	} else {
463		netif_napi_add(&wil->napi_ndev, &wil->napi_rx,
464			       wil6210_netdev_poll_rx);
465		netif_napi_add_tx(&wil->napi_ndev,
466				  &wil->napi_tx, wil6210_netdev_poll_tx);
467	}
468
469	wil_update_net_queues_bh(wil, vif, NULL, true);
470
471	rtnl_lock();
472	wiphy_lock(wiphy);
473	rc = wil_vif_add(wil, vif);
474	wiphy_unlock(wiphy);
475	rtnl_unlock();
476	if (rc < 0)
477		goto out_wiphy;
478
479	return 0;
480
481out_wiphy:
482	wiphy_unregister(wiphy);
483	return rc;
484}
485
486void wil_vif_remove(struct wil6210_priv *wil, u8 mid)
487{
488	struct wil6210_vif *vif;
489	struct net_device *ndev;
490	bool any_active = wil_has_active_ifaces(wil, true, false);
491
492	ASSERT_RTNL();
493	if (mid >= GET_MAX_VIFS(wil)) {
494		wil_err(wil, "invalid MID: %d\n", mid);
495		return;
496	}
497
498	vif = wil->vifs[mid];
499	if (!vif) {
500		wil_err(wil, "MID %d not registered\n", mid);
501		return;
502	}
503
504	mutex_lock(&wil->mutex);
505	wil6210_disconnect(vif, NULL, WLAN_REASON_DEAUTH_LEAVING);
506	mutex_unlock(&wil->mutex);
507
508	ndev = vif_to_ndev(vif);
509	/* during unregister_netdevice cfg80211_leave may perform operations
510	 * such as stop AP, disconnect, so we only clear the VIF afterwards
511	 */
512	cfg80211_unregister_netdevice(ndev);
513
514	if (any_active && vif->mid != 0)
515		wmi_port_delete(wil, vif->mid);
516
517	/* make sure no one is accessing the VIF before removing */
518	mutex_lock(&wil->vif_mutex);
519	wil->vifs[mid] = NULL;
520	/* ensure NAPI code will see the NULL VIF */
521	wmb();
522	if (test_bit(wil_status_napi_en, wil->status)) {
523		napi_synchronize(&wil->napi_rx);
524		napi_synchronize(&wil->napi_tx);
525	}
526	mutex_unlock(&wil->vif_mutex);
527
528	flush_work(&wil->wmi_event_worker);
529	del_timer_sync(&vif->connect_timer);
530	cancel_work_sync(&vif->disconnect_worker);
531	wil_probe_client_flush(vif);
532	cancel_work_sync(&vif->probe_client_worker);
533	cancel_work_sync(&vif->enable_tx_key_worker);
534	/* for VIFs, ndev will be freed by destructor after RTNL is unlocked.
535	 * the main interface will be freed in wil_if_free, we need to keep it
536	 * a bit longer so logging macros will work.
537	 */
538}
539
540void wil_if_remove(struct wil6210_priv *wil)
541{
542	struct net_device *ndev = wil->main_ndev;
543	struct wireless_dev *wdev = ndev->ieee80211_ptr;
544	struct wiphy *wiphy = wdev->wiphy;
545
546	wil_dbg_misc(wil, "if_remove\n");
547
548	rtnl_lock();
549	wiphy_lock(wiphy);
550	wil_vif_remove(wil, 0);
551	wiphy_unlock(wiphy);
552	rtnl_unlock();
553
554	netif_napi_del(&wil->napi_tx);
555	netif_napi_del(&wil->napi_rx);
556
557	wiphy_unregister(wiphy);
558}
559