1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (c) 2021, MediaTek Inc.
4 * Copyright (c) 2021-2022, Intel Corporation.
5 *
6 * Authors:
7 * Chandrashekar Devegowda <chandrashekar.devegowda@intel.com>
8 * Haijun Liu <haijun.liu@mediatek.com>
9 * Ricardo Martinez <ricardo.martinez@linux.intel.com>
10 *
11 * Contributors:
12 * Amir Hanania <amir.hanania@intel.com>
13 * Andy Shevchenko <andriy.shevchenko@linux.intel.com>
14 * Chiranjeevi Rapolu <chiranjeevi.rapolu@intel.com>
15 * Eliot Lee <eliot.lee@intel.com>
16 * Moises Veleta <moises.veleta@intel.com>
17 * Sreehari Kancharla <sreehari.kancharla@intel.com>
18 */
19
20 #include <linux/atomic.h>
21 #include <linux/device.h>
22 #include <linux/gfp.h>
23 #include <linux/if_arp.h>
24 #include <linux/if_ether.h>
25 #include <linux/ip.h>
26 #include <linux/kernel.h>
27 #include <linux/list.h>
28 #include <linux/netdev_features.h>
29 #include <linux/netdevice.h>
30 #include <linux/pm_runtime.h>
31 #include <linux/skbuff.h>
32 #include <linux/types.h>
33 #include <linux/wwan.h>
34 #include <net/ipv6.h>
35 #include <net/pkt_sched.h>
36
37 #include "t7xx_hif_dpmaif_rx.h"
38 #include "t7xx_hif_dpmaif_tx.h"
39 #include "t7xx_netdev.h"
40 #include "t7xx_pci.h"
41 #include "t7xx_port_proxy.h"
42 #include "t7xx_state_monitor.h"
43
44 #define IP_MUX_SESSION_DEFAULT 0
45 #define SBD_PACKET_TYPE_MASK GENMASK(7, 4)
46
t7xx_ccmni_enable_napi(struct t7xx_ccmni_ctrl * ctlb)47 static void t7xx_ccmni_enable_napi(struct t7xx_ccmni_ctrl *ctlb)
48 {
49 struct dpmaif_ctrl *ctrl;
50 int i, ret;
51
52 ctrl = ctlb->hif_ctrl;
53
54 if (ctlb->is_napi_en)
55 return;
56
57 for (i = 0; i < RXQ_NUM; i++) {
58 /* The usage count has to be bumped every time before calling
59 * napi_schedule. It will be decresed in the poll routine,
60 * right after napi_complete_done is called.
61 */
62 ret = pm_runtime_resume_and_get(ctrl->dev);
63 if (ret < 0) {
64 dev_err(ctrl->dev, "Failed to resume device: %d\n",
65 ret);
66 return;
67 }
68 napi_enable(ctlb->napi[i]);
69 napi_schedule(ctlb->napi[i]);
70 }
71 ctlb->is_napi_en = true;
72 }
73
t7xx_ccmni_disable_napi(struct t7xx_ccmni_ctrl * ctlb)74 static void t7xx_ccmni_disable_napi(struct t7xx_ccmni_ctrl *ctlb)
75 {
76 int i;
77
78 if (!ctlb->is_napi_en)
79 return;
80
81 for (i = 0; i < RXQ_NUM; i++) {
82 napi_synchronize(ctlb->napi[i]);
83 napi_disable(ctlb->napi[i]);
84 }
85
86 ctlb->is_napi_en = false;
87 }
88
t7xx_ccmni_open(struct net_device * dev)89 static int t7xx_ccmni_open(struct net_device *dev)
90 {
91 struct t7xx_ccmni *ccmni = wwan_netdev_drvpriv(dev);
92 struct t7xx_ccmni_ctrl *ccmni_ctl = ccmni->ctlb;
93
94 netif_carrier_on(dev);
95 netif_tx_start_all_queues(dev);
96 if (!atomic_fetch_inc(&ccmni_ctl->napi_usr_refcnt))
97 t7xx_ccmni_enable_napi(ccmni_ctl);
98
99 atomic_inc(&ccmni->usage);
100 return 0;
101 }
102
t7xx_ccmni_close(struct net_device * dev)103 static int t7xx_ccmni_close(struct net_device *dev)
104 {
105 struct t7xx_ccmni *ccmni = wwan_netdev_drvpriv(dev);
106 struct t7xx_ccmni_ctrl *ccmni_ctl = ccmni->ctlb;
107
108 atomic_dec(&ccmni->usage);
109 if (atomic_dec_and_test(&ccmni_ctl->napi_usr_refcnt))
110 t7xx_ccmni_disable_napi(ccmni_ctl);
111
112 netif_carrier_off(dev);
113 netif_tx_disable(dev);
114 return 0;
115 }
116
t7xx_ccmni_send_packet(struct t7xx_ccmni * ccmni,struct sk_buff * skb,unsigned int txq_number)117 static int t7xx_ccmni_send_packet(struct t7xx_ccmni *ccmni, struct sk_buff *skb,
118 unsigned int txq_number)
119 {
120 struct t7xx_ccmni_ctrl *ctlb = ccmni->ctlb;
121 struct t7xx_skb_cb *skb_cb = T7XX_SKB_CB(skb);
122
123 skb_cb->netif_idx = ccmni->index;
124
125 if (t7xx_dpmaif_tx_send_skb(ctlb->hif_ctrl, txq_number, skb))
126 return NETDEV_TX_BUSY;
127
128 return 0;
129 }
130
t7xx_ccmni_start_xmit(struct sk_buff * skb,struct net_device * dev)131 static netdev_tx_t t7xx_ccmni_start_xmit(struct sk_buff *skb, struct net_device *dev)
132 {
133 struct t7xx_ccmni *ccmni = wwan_netdev_drvpriv(dev);
134 int skb_len = skb->len;
135
136 /* If MTU is changed or there is no headroom, drop the packet */
137 if (skb->len > dev->mtu || skb_headroom(skb) < sizeof(struct ccci_header)) {
138 dev_kfree_skb(skb);
139 dev->stats.tx_dropped++;
140 return NETDEV_TX_OK;
141 }
142
143 if (t7xx_ccmni_send_packet(ccmni, skb, DPMAIF_TX_DEFAULT_QUEUE))
144 return NETDEV_TX_BUSY;
145
146 dev->stats.tx_packets++;
147 dev->stats.tx_bytes += skb_len;
148
149 return NETDEV_TX_OK;
150 }
151
t7xx_ccmni_tx_timeout(struct net_device * dev,unsigned int __always_unused txqueue)152 static void t7xx_ccmni_tx_timeout(struct net_device *dev, unsigned int __always_unused txqueue)
153 {
154 struct t7xx_ccmni *ccmni = netdev_priv(dev);
155
156 dev->stats.tx_errors++;
157
158 if (atomic_read(&ccmni->usage) > 0)
159 netif_tx_wake_all_queues(dev);
160 }
161
162 static const struct net_device_ops ccmni_netdev_ops = {
163 .ndo_open = t7xx_ccmni_open,
164 .ndo_stop = t7xx_ccmni_close,
165 .ndo_start_xmit = t7xx_ccmni_start_xmit,
166 .ndo_tx_timeout = t7xx_ccmni_tx_timeout,
167 };
168
t7xx_ccmni_start(struct t7xx_ccmni_ctrl * ctlb)169 static void t7xx_ccmni_start(struct t7xx_ccmni_ctrl *ctlb)
170 {
171 struct t7xx_ccmni *ccmni;
172 int i;
173
174 for (i = 0; i < ctlb->nic_dev_num; i++) {
175 ccmni = ctlb->ccmni_inst[i];
176 if (!ccmni)
177 continue;
178
179 if (atomic_read(&ccmni->usage) > 0) {
180 netif_tx_start_all_queues(ccmni->dev);
181 netif_carrier_on(ccmni->dev);
182 }
183 }
184
185 if (atomic_read(&ctlb->napi_usr_refcnt))
186 t7xx_ccmni_enable_napi(ctlb);
187 }
188
t7xx_ccmni_pre_stop(struct t7xx_ccmni_ctrl * ctlb)189 static void t7xx_ccmni_pre_stop(struct t7xx_ccmni_ctrl *ctlb)
190 {
191 struct t7xx_ccmni *ccmni;
192 int i;
193
194 for (i = 0; i < ctlb->nic_dev_num; i++) {
195 ccmni = ctlb->ccmni_inst[i];
196 if (!ccmni)
197 continue;
198
199 if (atomic_read(&ccmni->usage) > 0)
200 netif_tx_disable(ccmni->dev);
201 }
202 }
203
t7xx_ccmni_post_stop(struct t7xx_ccmni_ctrl * ctlb)204 static void t7xx_ccmni_post_stop(struct t7xx_ccmni_ctrl *ctlb)
205 {
206 struct t7xx_ccmni *ccmni;
207 int i;
208
209 if (atomic_read(&ctlb->napi_usr_refcnt))
210 t7xx_ccmni_disable_napi(ctlb);
211
212 for (i = 0; i < ctlb->nic_dev_num; i++) {
213 ccmni = ctlb->ccmni_inst[i];
214 if (!ccmni)
215 continue;
216
217 if (atomic_read(&ccmni->usage) > 0)
218 netif_carrier_off(ccmni->dev);
219 }
220 }
221
t7xx_ccmni_wwan_setup(struct net_device * dev)222 static void t7xx_ccmni_wwan_setup(struct net_device *dev)
223 {
224 dev->needed_headroom += sizeof(struct ccci_header);
225
226 dev->mtu = ETH_DATA_LEN;
227 dev->max_mtu = CCMNI_MTU_MAX;
228 BUILD_BUG_ON(CCMNI_MTU_MAX > DPMAIF_HW_MTU_SIZE);
229
230 dev->tx_queue_len = DEFAULT_TX_QUEUE_LEN;
231 dev->watchdog_timeo = CCMNI_NETDEV_WDT_TO;
232
233 dev->flags = IFF_POINTOPOINT | IFF_NOARP;
234
235 dev->features = NETIF_F_VLAN_CHALLENGED;
236
237 dev->features |= NETIF_F_SG;
238 dev->hw_features |= NETIF_F_SG;
239
240 dev->features |= NETIF_F_HW_CSUM;
241 dev->hw_features |= NETIF_F_HW_CSUM;
242
243 dev->features |= NETIF_F_RXCSUM;
244 dev->hw_features |= NETIF_F_RXCSUM;
245
246 dev->features |= NETIF_F_GRO;
247 dev->hw_features |= NETIF_F_GRO;
248
249 dev->needs_free_netdev = true;
250
251 dev->type = ARPHRD_NONE;
252
253 dev->netdev_ops = &ccmni_netdev_ops;
254 }
255
t7xx_init_netdev_napi(struct t7xx_ccmni_ctrl * ctlb)256 static void t7xx_init_netdev_napi(struct t7xx_ccmni_ctrl *ctlb)
257 {
258 int i;
259
260 /* one HW, but shared with multiple net devices,
261 * so add a dummy device for NAPI.
262 */
263 init_dummy_netdev(&ctlb->dummy_dev);
264 atomic_set(&ctlb->napi_usr_refcnt, 0);
265 ctlb->is_napi_en = false;
266
267 for (i = 0; i < RXQ_NUM; i++) {
268 ctlb->napi[i] = &ctlb->hif_ctrl->rxq[i].napi;
269 netif_napi_add_weight(&ctlb->dummy_dev, ctlb->napi[i], t7xx_dpmaif_napi_rx_poll,
270 NIC_NAPI_POLL_BUDGET);
271 }
272 }
273
t7xx_uninit_netdev_napi(struct t7xx_ccmni_ctrl * ctlb)274 static void t7xx_uninit_netdev_napi(struct t7xx_ccmni_ctrl *ctlb)
275 {
276 int i;
277
278 for (i = 0; i < RXQ_NUM; i++) {
279 netif_napi_del(ctlb->napi[i]);
280 ctlb->napi[i] = NULL;
281 }
282 }
283
t7xx_ccmni_wwan_newlink(void * ctxt,struct net_device * dev,u32 if_id,struct netlink_ext_ack * extack)284 static int t7xx_ccmni_wwan_newlink(void *ctxt, struct net_device *dev, u32 if_id,
285 struct netlink_ext_ack *extack)
286 {
287 struct t7xx_ccmni_ctrl *ctlb = ctxt;
288 struct t7xx_ccmni *ccmni;
289 int ret;
290
291 if (if_id >= ARRAY_SIZE(ctlb->ccmni_inst))
292 return -EINVAL;
293
294 ccmni = wwan_netdev_drvpriv(dev);
295 ccmni->index = if_id;
296 ccmni->ctlb = ctlb;
297 ccmni->dev = dev;
298 atomic_set(&ccmni->usage, 0);
299 WRITE_ONCE(ctlb->ccmni_inst[if_id], ccmni);
300
301 ret = register_netdevice(dev);
302 if (ret)
303 return ret;
304
305 netif_device_attach(dev);
306 return 0;
307 }
308
t7xx_ccmni_wwan_dellink(void * ctxt,struct net_device * dev,struct list_head * head)309 static void t7xx_ccmni_wwan_dellink(void *ctxt, struct net_device *dev, struct list_head *head)
310 {
311 struct t7xx_ccmni *ccmni = wwan_netdev_drvpriv(dev);
312 struct t7xx_ccmni_ctrl *ctlb = ctxt;
313 u8 if_id = ccmni->index;
314
315 if (if_id >= ARRAY_SIZE(ctlb->ccmni_inst))
316 return;
317
318 if (WARN_ON(ctlb->ccmni_inst[if_id] != ccmni))
319 return;
320
321 WRITE_ONCE(ctlb->ccmni_inst[if_id], NULL);
322 unregister_netdevice(dev);
323 }
324
325 static const struct wwan_ops ccmni_wwan_ops = {
326 .priv_size = sizeof(struct t7xx_ccmni),
327 .setup = t7xx_ccmni_wwan_setup,
328 .newlink = t7xx_ccmni_wwan_newlink,
329 .dellink = t7xx_ccmni_wwan_dellink,
330 };
331
t7xx_ccmni_register_wwan(struct t7xx_ccmni_ctrl * ctlb)332 static int t7xx_ccmni_register_wwan(struct t7xx_ccmni_ctrl *ctlb)
333 {
334 struct device *dev = ctlb->hif_ctrl->dev;
335 int ret;
336
337 if (ctlb->wwan_is_registered)
338 return 0;
339
340 /* WWAN core will create a netdev for the default IP MUX channel */
341 ret = wwan_register_ops(dev, &ccmni_wwan_ops, ctlb, IP_MUX_SESSION_DEFAULT);
342 if (ret < 0) {
343 dev_err(dev, "Unable to register WWAN ops, %d\n", ret);
344 return ret;
345 }
346
347 ctlb->wwan_is_registered = true;
348 return 0;
349 }
350
t7xx_ccmni_md_state_callback(enum md_state state,void * para)351 static int t7xx_ccmni_md_state_callback(enum md_state state, void *para)
352 {
353 struct t7xx_ccmni_ctrl *ctlb = para;
354 struct device *dev;
355 int ret = 0;
356
357 dev = ctlb->hif_ctrl->dev;
358 ctlb->md_sta = state;
359
360 switch (state) {
361 case MD_STATE_READY:
362 ret = t7xx_ccmni_register_wwan(ctlb);
363 if (!ret)
364 t7xx_ccmni_start(ctlb);
365 break;
366
367 case MD_STATE_EXCEPTION:
368 case MD_STATE_STOPPED:
369 t7xx_ccmni_pre_stop(ctlb);
370
371 ret = t7xx_dpmaif_md_state_callback(ctlb->hif_ctrl, state);
372 if (ret < 0)
373 dev_err(dev, "DPMAIF md state callback err, state=%d\n", state);
374
375 t7xx_ccmni_post_stop(ctlb);
376 break;
377
378 case MD_STATE_WAITING_FOR_HS1:
379 case MD_STATE_WAITING_TO_STOP:
380 ret = t7xx_dpmaif_md_state_callback(ctlb->hif_ctrl, state);
381 if (ret < 0)
382 dev_err(dev, "DPMAIF md state callback err, state=%d\n", state);
383
384 break;
385
386 default:
387 break;
388 }
389
390 return ret;
391 }
392
init_md_status_notifier(struct t7xx_pci_dev * t7xx_dev)393 static void init_md_status_notifier(struct t7xx_pci_dev *t7xx_dev)
394 {
395 struct t7xx_ccmni_ctrl *ctlb = t7xx_dev->ccmni_ctlb;
396 struct t7xx_fsm_notifier *md_status_notifier;
397
398 md_status_notifier = &ctlb->md_status_notify;
399 INIT_LIST_HEAD(&md_status_notifier->entry);
400 md_status_notifier->notifier_fn = t7xx_ccmni_md_state_callback;
401 md_status_notifier->data = ctlb;
402
403 t7xx_fsm_notifier_register(t7xx_dev->md, md_status_notifier);
404 }
405
t7xx_ccmni_recv_skb(struct t7xx_ccmni_ctrl * ccmni_ctlb,struct sk_buff * skb,struct napi_struct * napi)406 static void t7xx_ccmni_recv_skb(struct t7xx_ccmni_ctrl *ccmni_ctlb, struct sk_buff *skb,
407 struct napi_struct *napi)
408 {
409 struct t7xx_skb_cb *skb_cb;
410 struct net_device *net_dev;
411 struct t7xx_ccmni *ccmni;
412 int pkt_type, skb_len;
413 u8 netif_id;
414
415 skb_cb = T7XX_SKB_CB(skb);
416 netif_id = skb_cb->netif_idx;
417 ccmni = READ_ONCE(ccmni_ctlb->ccmni_inst[netif_id]);
418 if (!ccmni) {
419 dev_kfree_skb(skb);
420 return;
421 }
422
423 net_dev = ccmni->dev;
424 pkt_type = skb_cb->rx_pkt_type;
425 skb->dev = net_dev;
426 if (pkt_type == PKT_TYPE_IP6)
427 skb->protocol = htons(ETH_P_IPV6);
428 else
429 skb->protocol = htons(ETH_P_IP);
430
431 skb_len = skb->len;
432 napi_gro_receive(napi, skb);
433 net_dev->stats.rx_packets++;
434 net_dev->stats.rx_bytes += skb_len;
435 }
436
t7xx_ccmni_queue_tx_irq_notify(struct t7xx_ccmni_ctrl * ctlb,int qno)437 static void t7xx_ccmni_queue_tx_irq_notify(struct t7xx_ccmni_ctrl *ctlb, int qno)
438 {
439 struct t7xx_ccmni *ccmni = READ_ONCE(ctlb->ccmni_inst[0]);
440 struct netdev_queue *net_queue;
441
442 if (netif_running(ccmni->dev) && atomic_read(&ccmni->usage) > 0) {
443 net_queue = netdev_get_tx_queue(ccmni->dev, qno);
444 if (netif_tx_queue_stopped(net_queue))
445 netif_tx_wake_queue(net_queue);
446 }
447 }
448
t7xx_ccmni_queue_tx_full_notify(struct t7xx_ccmni_ctrl * ctlb,int qno)449 static void t7xx_ccmni_queue_tx_full_notify(struct t7xx_ccmni_ctrl *ctlb, int qno)
450 {
451 struct t7xx_ccmni *ccmni = READ_ONCE(ctlb->ccmni_inst[0]);
452 struct netdev_queue *net_queue;
453
454 if (atomic_read(&ccmni->usage) > 0) {
455 netdev_err(ccmni->dev, "TX queue %d is full\n", qno);
456 net_queue = netdev_get_tx_queue(ccmni->dev, qno);
457 netif_tx_stop_queue(net_queue);
458 }
459 }
460
t7xx_ccmni_queue_state_notify(struct t7xx_pci_dev * t7xx_dev,enum dpmaif_txq_state state,int qno)461 static void t7xx_ccmni_queue_state_notify(struct t7xx_pci_dev *t7xx_dev,
462 enum dpmaif_txq_state state, int qno)
463 {
464 struct t7xx_ccmni_ctrl *ctlb = t7xx_dev->ccmni_ctlb;
465
466 if (ctlb->md_sta != MD_STATE_READY)
467 return;
468
469 if (!READ_ONCE(ctlb->ccmni_inst[0])) {
470 dev_warn(&t7xx_dev->pdev->dev, "No netdev registered yet\n");
471 return;
472 }
473
474 if (state == DMPAIF_TXQ_STATE_IRQ)
475 t7xx_ccmni_queue_tx_irq_notify(ctlb, qno);
476 else if (state == DMPAIF_TXQ_STATE_FULL)
477 t7xx_ccmni_queue_tx_full_notify(ctlb, qno);
478 }
479
t7xx_ccmni_init(struct t7xx_pci_dev * t7xx_dev)480 int t7xx_ccmni_init(struct t7xx_pci_dev *t7xx_dev)
481 {
482 struct device *dev = &t7xx_dev->pdev->dev;
483 struct t7xx_ccmni_ctrl *ctlb;
484
485 ctlb = devm_kzalloc(dev, sizeof(*ctlb), GFP_KERNEL);
486 if (!ctlb)
487 return -ENOMEM;
488
489 t7xx_dev->ccmni_ctlb = ctlb;
490 ctlb->t7xx_dev = t7xx_dev;
491 ctlb->callbacks.state_notify = t7xx_ccmni_queue_state_notify;
492 ctlb->callbacks.recv_skb = t7xx_ccmni_recv_skb;
493 ctlb->nic_dev_num = NIC_DEV_DEFAULT;
494
495 ctlb->hif_ctrl = t7xx_dpmaif_hif_init(t7xx_dev, &ctlb->callbacks);
496 if (!ctlb->hif_ctrl)
497 return -ENOMEM;
498
499 t7xx_init_netdev_napi(ctlb);
500 init_md_status_notifier(t7xx_dev);
501 return 0;
502 }
503
t7xx_ccmni_exit(struct t7xx_pci_dev * t7xx_dev)504 void t7xx_ccmni_exit(struct t7xx_pci_dev *t7xx_dev)
505 {
506 struct t7xx_ccmni_ctrl *ctlb = t7xx_dev->ccmni_ctlb;
507
508 t7xx_fsm_notifier_unregister(t7xx_dev->md, &ctlb->md_status_notify);
509
510 if (ctlb->wwan_is_registered) {
511 wwan_unregister_ops(&t7xx_dev->pdev->dev);
512 ctlb->wwan_is_registered = false;
513 }
514
515 t7xx_uninit_netdev_napi(ctlb);
516 t7xx_dpmaif_hif_exit(ctlb->hif_ctrl);
517 }
518