1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Keystone NetCP Core driver
4  *
5  * Copyright (C) 2014 Texas Instruments Incorporated
6  * Authors:	Sandeep Nair <sandeep_n@ti.com>
7  *		Sandeep Paulraj <s-paulraj@ti.com>
8  *		Cyril Chemparathy <cyril@ti.com>
9  *		Santosh Shilimkar <santosh.shilimkar@ti.com>
10  *		Murali Karicheri <m-karicheri2@ti.com>
11  *		Wingman Kwok <w-kwok2@ti.com>
12  */
13 
14 #include <linux/io.h>
15 #include <linux/module.h>
16 #include <linux/of_net.h>
17 #include <linux/of_address.h>
18 #include <linux/if_vlan.h>
19 #include <linux/pm_runtime.h>
20 #include <linux/platform_device.h>
21 #include <linux/soc/ti/knav_qmss.h>
22 #include <linux/soc/ti/knav_dma.h>
23 
24 #include "netcp.h"
25 
26 #define NETCP_SOP_OFFSET	(NET_IP_ALIGN + NET_SKB_PAD)
27 #define NETCP_NAPI_WEIGHT	64
28 #define NETCP_TX_TIMEOUT	(5 * HZ)
29 #define NETCP_PACKET_SIZE	(ETH_FRAME_LEN + ETH_FCS_LEN)
30 #define NETCP_MIN_PACKET_SIZE	ETH_ZLEN
31 #define NETCP_MAX_MCAST_ADDR	16
32 
33 #define NETCP_EFUSE_REG_INDEX	0
34 
35 #define NETCP_MOD_PROBE_SKIPPED	1
36 #define NETCP_MOD_PROBE_FAILED	2
37 
38 #define NETCP_DEBUG (NETIF_MSG_HW	| NETIF_MSG_WOL		|	\
39 		    NETIF_MSG_DRV	| NETIF_MSG_LINK	|	\
40 		    NETIF_MSG_IFUP	| NETIF_MSG_INTR	|	\
41 		    NETIF_MSG_PROBE	| NETIF_MSG_TIMER	|	\
42 		    NETIF_MSG_IFDOWN	| NETIF_MSG_RX_ERR	|	\
43 		    NETIF_MSG_TX_ERR	| NETIF_MSG_TX_DONE	|	\
44 		    NETIF_MSG_PKTDATA	| NETIF_MSG_TX_QUEUED	|	\
45 		    NETIF_MSG_RX_STATUS)
46 
47 #define NETCP_EFUSE_ADDR_SWAP	2
48 
49 #define knav_queue_get_id(q)	knav_queue_device_control(q, \
50 				KNAV_QUEUE_GET_ID, (unsigned long)NULL)
51 
52 #define knav_queue_enable_notify(q) knav_queue_device_control(q,	\
53 					KNAV_QUEUE_ENABLE_NOTIFY,	\
54 					(unsigned long)NULL)
55 
56 #define knav_queue_disable_notify(q) knav_queue_device_control(q,	\
57 					KNAV_QUEUE_DISABLE_NOTIFY,	\
58 					(unsigned long)NULL)
59 
60 #define knav_queue_get_count(q)	knav_queue_device_control(q, \
61 				KNAV_QUEUE_GET_COUNT, (unsigned long)NULL)
62 
63 #define for_each_netcp_module(module)			\
64 	list_for_each_entry(module, &netcp_modules, module_list)
65 
66 #define for_each_netcp_device_module(netcp_device, inst_modpriv) \
67 	list_for_each_entry(inst_modpriv, \
68 		&((netcp_device)->modpriv_head), inst_list)
69 
70 #define for_each_module(netcp, intf_modpriv)			\
71 	list_for_each_entry(intf_modpriv, &netcp->module_head, intf_list)
72 
73 /* Module management structures */
74 struct netcp_device {
75 	struct list_head	device_list;
76 	struct list_head	interface_head;
77 	struct list_head	modpriv_head;
78 	struct device		*device;
79 };
80 
81 struct netcp_inst_modpriv {
82 	struct netcp_device	*netcp_device;
83 	struct netcp_module	*netcp_module;
84 	struct list_head	inst_list;
85 	void			*module_priv;
86 };
87 
88 struct netcp_intf_modpriv {
89 	struct netcp_intf	*netcp_priv;
90 	struct netcp_module	*netcp_module;
91 	struct list_head	intf_list;
92 	void			*module_priv;
93 };
94 
95 struct netcp_tx_cb {
96 	void	*ts_context;
97 	void	(*txtstamp)(void *context, struct sk_buff *skb);
98 };
99 
100 static LIST_HEAD(netcp_devices);
101 static LIST_HEAD(netcp_modules);
102 static DEFINE_MUTEX(netcp_modules_lock);
103 
104 static int netcp_debug_level = -1;
105 module_param(netcp_debug_level, int, 0);
106 MODULE_PARM_DESC(netcp_debug_level, "Netcp debug level (NETIF_MSG bits) (0=none,...,16=all)");
107 
108 /* Helper functions - Get/Set */
109 static void get_pkt_info(dma_addr_t *buff, u32 *buff_len, dma_addr_t *ndesc,
110 			 struct knav_dma_desc *desc)
111 {
112 	*buff_len = le32_to_cpu(desc->buff_len);
113 	*buff = le32_to_cpu(desc->buff);
114 	*ndesc = le32_to_cpu(desc->next_desc);
115 }
116 
117 static void get_desc_info(u32 *desc_info, u32 *pkt_info,
118 			  struct knav_dma_desc *desc)
119 {
120 	*desc_info = le32_to_cpu(desc->desc_info);
121 	*pkt_info = le32_to_cpu(desc->packet_info);
122 }
123 
124 static u32 get_sw_data(int index, struct knav_dma_desc *desc)
125 {
126 	/* No Endian conversion needed as this data is untouched by hw */
127 	return desc->sw_data[index];
128 }
129 
130 /* use these macros to get sw data */
131 #define GET_SW_DATA0(desc) get_sw_data(0, desc)
132 #define GET_SW_DATA1(desc) get_sw_data(1, desc)
133 #define GET_SW_DATA2(desc) get_sw_data(2, desc)
134 #define GET_SW_DATA3(desc) get_sw_data(3, desc)
135 
136 static void get_org_pkt_info(dma_addr_t *buff, u32 *buff_len,
137 			     struct knav_dma_desc *desc)
138 {
139 	*buff = le32_to_cpu(desc->orig_buff);
140 	*buff_len = le32_to_cpu(desc->orig_len);
141 }
142 
143 static void get_words(dma_addr_t *words, int num_words, __le32 *desc)
144 {
145 	int i;
146 
147 	for (i = 0; i < num_words; i++)
148 		words[i] = le32_to_cpu(desc[i]);
149 }
150 
151 static void set_pkt_info(dma_addr_t buff, u32 buff_len, u32 ndesc,
152 			 struct knav_dma_desc *desc)
153 {
154 	desc->buff_len = cpu_to_le32(buff_len);
155 	desc->buff = cpu_to_le32(buff);
156 	desc->next_desc = cpu_to_le32(ndesc);
157 }
158 
159 static void set_desc_info(u32 desc_info, u32 pkt_info,
160 			  struct knav_dma_desc *desc)
161 {
162 	desc->desc_info = cpu_to_le32(desc_info);
163 	desc->packet_info = cpu_to_le32(pkt_info);
164 }
165 
166 static void set_sw_data(int index, u32 data, struct knav_dma_desc *desc)
167 {
168 	/* No Endian conversion needed as this data is untouched by hw */
169 	desc->sw_data[index] = data;
170 }
171 
172 /* use these macros to set sw data */
173 #define SET_SW_DATA0(data, desc) set_sw_data(0, data, desc)
174 #define SET_SW_DATA1(data, desc) set_sw_data(1, data, desc)
175 #define SET_SW_DATA2(data, desc) set_sw_data(2, data, desc)
176 #define SET_SW_DATA3(data, desc) set_sw_data(3, data, desc)
177 
178 static void set_org_pkt_info(dma_addr_t buff, u32 buff_len,
179 			     struct knav_dma_desc *desc)
180 {
181 	desc->orig_buff = cpu_to_le32(buff);
182 	desc->orig_len = cpu_to_le32(buff_len);
183 }
184 
185 static void set_words(u32 *words, int num_words, __le32 *desc)
186 {
187 	int i;
188 
189 	for (i = 0; i < num_words; i++)
190 		desc[i] = cpu_to_le32(words[i]);
191 }
192 
193 /* Read the e-fuse value as 32 bit values to be endian independent */
194 static int emac_arch_get_mac_addr(char *x, void __iomem *efuse_mac, u32 swap)
195 {
196 	unsigned int addr0, addr1;
197 
198 	addr1 = readl(efuse_mac + 4);
199 	addr0 = readl(efuse_mac);
200 
201 	switch (swap) {
202 	case NETCP_EFUSE_ADDR_SWAP:
203 		addr0 = addr1;
204 		addr1 = readl(efuse_mac);
205 		break;
206 	default:
207 		break;
208 	}
209 
210 	x[0] = (addr1 & 0x0000ff00) >> 8;
211 	x[1] = addr1 & 0x000000ff;
212 	x[2] = (addr0 & 0xff000000) >> 24;
213 	x[3] = (addr0 & 0x00ff0000) >> 16;
214 	x[4] = (addr0 & 0x0000ff00) >> 8;
215 	x[5] = addr0 & 0x000000ff;
216 
217 	return 0;
218 }
219 
220 /* Module management routines */
221 static int netcp_register_interface(struct netcp_intf *netcp)
222 {
223 	int ret;
224 
225 	ret = register_netdev(netcp->ndev);
226 	if (!ret)
227 		netcp->netdev_registered = true;
228 	return ret;
229 }
230 
231 static int netcp_module_probe(struct netcp_device *netcp_device,
232 			      struct netcp_module *module)
233 {
234 	struct device *dev = netcp_device->device;
235 	struct device_node *devices, *interface, *node = dev->of_node;
236 	struct device_node *child;
237 	struct netcp_inst_modpriv *inst_modpriv;
238 	struct netcp_intf *netcp_intf;
239 	struct netcp_module *tmp;
240 	bool primary_module_registered = false;
241 	int ret;
242 
243 	/* Find this module in the sub-tree for this device */
244 	devices = of_get_child_by_name(node, "netcp-devices");
245 	if (!devices) {
246 		dev_err(dev, "could not find netcp-devices node\n");
247 		return NETCP_MOD_PROBE_SKIPPED;
248 	}
249 
250 	for_each_available_child_of_node(devices, child) {
251 		const char *name;
252 		char node_name[32];
253 
254 		if (of_property_read_string(child, "label", &name) < 0) {
255 			snprintf(node_name, sizeof(node_name), "%pOFn", child);
256 			name = node_name;
257 		}
258 		if (!strcasecmp(module->name, name))
259 			break;
260 	}
261 
262 	of_node_put(devices);
263 	/* If module not used for this device, skip it */
264 	if (!child) {
265 		dev_warn(dev, "module(%s) not used for device\n", module->name);
266 		return NETCP_MOD_PROBE_SKIPPED;
267 	}
268 
269 	inst_modpriv = devm_kzalloc(dev, sizeof(*inst_modpriv), GFP_KERNEL);
270 	if (!inst_modpriv) {
271 		of_node_put(child);
272 		return -ENOMEM;
273 	}
274 
275 	inst_modpriv->netcp_device = netcp_device;
276 	inst_modpriv->netcp_module = module;
277 	list_add_tail(&inst_modpriv->inst_list, &netcp_device->modpriv_head);
278 
279 	ret = module->probe(netcp_device, dev, child,
280 			    &inst_modpriv->module_priv);
281 	of_node_put(child);
282 	if (ret) {
283 		dev_err(dev, "Probe of module(%s) failed with %d\n",
284 			module->name, ret);
285 		list_del(&inst_modpriv->inst_list);
286 		devm_kfree(dev, inst_modpriv);
287 		return NETCP_MOD_PROBE_FAILED;
288 	}
289 
290 	/* Attach modules only if the primary module is probed */
291 	for_each_netcp_module(tmp) {
292 		if (tmp->primary)
293 			primary_module_registered = true;
294 	}
295 
296 	if (!primary_module_registered)
297 		return 0;
298 
299 	/* Attach module to interfaces */
300 	list_for_each_entry(netcp_intf, &netcp_device->interface_head,
301 			    interface_list) {
302 		struct netcp_intf_modpriv *intf_modpriv;
303 
304 		intf_modpriv = devm_kzalloc(dev, sizeof(*intf_modpriv),
305 					    GFP_KERNEL);
306 		if (!intf_modpriv)
307 			return -ENOMEM;
308 
309 		interface = of_parse_phandle(netcp_intf->node_interface,
310 					     module->name, 0);
311 
312 		if (!interface) {
313 			devm_kfree(dev, intf_modpriv);
314 			continue;
315 		}
316 
317 		intf_modpriv->netcp_priv = netcp_intf;
318 		intf_modpriv->netcp_module = module;
319 		list_add_tail(&intf_modpriv->intf_list,
320 			      &netcp_intf->module_head);
321 
322 		ret = module->attach(inst_modpriv->module_priv,
323 				     netcp_intf->ndev, interface,
324 				     &intf_modpriv->module_priv);
325 		of_node_put(interface);
326 		if (ret) {
327 			dev_dbg(dev, "Attach of module %s declined with %d\n",
328 				module->name, ret);
329 			list_del(&intf_modpriv->intf_list);
330 			devm_kfree(dev, intf_modpriv);
331 			continue;
332 		}
333 	}
334 
335 	/* Now register the interface with netdev */
336 	list_for_each_entry(netcp_intf,
337 			    &netcp_device->interface_head,
338 			    interface_list) {
339 		/* If interface not registered then register now */
340 		if (!netcp_intf->netdev_registered) {
341 			ret = netcp_register_interface(netcp_intf);
342 			if (ret)
343 				return -ENODEV;
344 		}
345 	}
346 	return 0;
347 }
348 
349 int netcp_register_module(struct netcp_module *module)
350 {
351 	struct netcp_device *netcp_device;
352 	struct netcp_module *tmp;
353 	int ret;
354 
355 	if (!module->name) {
356 		WARN(1, "error registering netcp module: no name\n");
357 		return -EINVAL;
358 	}
359 
360 	if (!module->probe) {
361 		WARN(1, "error registering netcp module: no probe\n");
362 		return -EINVAL;
363 	}
364 
365 	mutex_lock(&netcp_modules_lock);
366 
367 	for_each_netcp_module(tmp) {
368 		if (!strcasecmp(tmp->name, module->name)) {
369 			mutex_unlock(&netcp_modules_lock);
370 			return -EEXIST;
371 		}
372 	}
373 	list_add_tail(&module->module_list, &netcp_modules);
374 
375 	list_for_each_entry(netcp_device, &netcp_devices, device_list) {
376 		ret = netcp_module_probe(netcp_device, module);
377 		if (ret < 0)
378 			goto fail;
379 	}
380 	mutex_unlock(&netcp_modules_lock);
381 	return 0;
382 
383 fail:
384 	mutex_unlock(&netcp_modules_lock);
385 	netcp_unregister_module(module);
386 	return ret;
387 }
388 EXPORT_SYMBOL_GPL(netcp_register_module);
389 
390 static void netcp_release_module(struct netcp_device *netcp_device,
391 				 struct netcp_module *module)
392 {
393 	struct netcp_inst_modpriv *inst_modpriv, *inst_tmp;
394 	struct netcp_intf *netcp_intf, *netcp_tmp;
395 	struct device *dev = netcp_device->device;
396 
397 	/* Release the module from each interface */
398 	list_for_each_entry_safe(netcp_intf, netcp_tmp,
399 				 &netcp_device->interface_head,
400 				 interface_list) {
401 		struct netcp_intf_modpriv *intf_modpriv, *intf_tmp;
402 
403 		list_for_each_entry_safe(intf_modpriv, intf_tmp,
404 					 &netcp_intf->module_head,
405 					 intf_list) {
406 			if (intf_modpriv->netcp_module == module) {
407 				module->release(intf_modpriv->module_priv);
408 				list_del(&intf_modpriv->intf_list);
409 				devm_kfree(dev, intf_modpriv);
410 				break;
411 			}
412 		}
413 	}
414 
415 	/* Remove the module from each instance */
416 	list_for_each_entry_safe(inst_modpriv, inst_tmp,
417 				 &netcp_device->modpriv_head, inst_list) {
418 		if (inst_modpriv->netcp_module == module) {
419 			module->remove(netcp_device,
420 				       inst_modpriv->module_priv);
421 			list_del(&inst_modpriv->inst_list);
422 			devm_kfree(dev, inst_modpriv);
423 			break;
424 		}
425 	}
426 }
427 
428 void netcp_unregister_module(struct netcp_module *module)
429 {
430 	struct netcp_device *netcp_device;
431 	struct netcp_module *module_tmp;
432 
433 	mutex_lock(&netcp_modules_lock);
434 
435 	list_for_each_entry(netcp_device, &netcp_devices, device_list) {
436 		netcp_release_module(netcp_device, module);
437 	}
438 
439 	/* Remove the module from the module list */
440 	for_each_netcp_module(module_tmp) {
441 		if (module == module_tmp) {
442 			list_del(&module->module_list);
443 			break;
444 		}
445 	}
446 
447 	mutex_unlock(&netcp_modules_lock);
448 }
449 EXPORT_SYMBOL_GPL(netcp_unregister_module);
450 
451 void *netcp_module_get_intf_data(struct netcp_module *module,
452 				 struct netcp_intf *intf)
453 {
454 	struct netcp_intf_modpriv *intf_modpriv;
455 
456 	list_for_each_entry(intf_modpriv, &intf->module_head, intf_list)
457 		if (intf_modpriv->netcp_module == module)
458 			return intf_modpriv->module_priv;
459 	return NULL;
460 }
461 EXPORT_SYMBOL_GPL(netcp_module_get_intf_data);
462 
463 /* Module TX and RX Hook management */
464 struct netcp_hook_list {
465 	struct list_head	 list;
466 	netcp_hook_rtn		*hook_rtn;
467 	void			*hook_data;
468 	int			 order;
469 };
470 
471 int netcp_register_txhook(struct netcp_intf *netcp_priv, int order,
472 			  netcp_hook_rtn *hook_rtn, void *hook_data)
473 {
474 	struct netcp_hook_list *entry;
475 	struct netcp_hook_list *next;
476 	unsigned long flags;
477 
478 	entry = devm_kzalloc(netcp_priv->dev, sizeof(*entry), GFP_KERNEL);
479 	if (!entry)
480 		return -ENOMEM;
481 
482 	entry->hook_rtn  = hook_rtn;
483 	entry->hook_data = hook_data;
484 	entry->order     = order;
485 
486 	spin_lock_irqsave(&netcp_priv->lock, flags);
487 	list_for_each_entry(next, &netcp_priv->txhook_list_head, list) {
488 		if (next->order > order)
489 			break;
490 	}
491 	__list_add(&entry->list, next->list.prev, &next->list);
492 	spin_unlock_irqrestore(&netcp_priv->lock, flags);
493 
494 	return 0;
495 }
496 EXPORT_SYMBOL_GPL(netcp_register_txhook);
497 
498 int netcp_unregister_txhook(struct netcp_intf *netcp_priv, int order,
499 			    netcp_hook_rtn *hook_rtn, void *hook_data)
500 {
501 	struct netcp_hook_list *next, *n;
502 	unsigned long flags;
503 
504 	spin_lock_irqsave(&netcp_priv->lock, flags);
505 	list_for_each_entry_safe(next, n, &netcp_priv->txhook_list_head, list) {
506 		if ((next->order     == order) &&
507 		    (next->hook_rtn  == hook_rtn) &&
508 		    (next->hook_data == hook_data)) {
509 			list_del(&next->list);
510 			spin_unlock_irqrestore(&netcp_priv->lock, flags);
511 			devm_kfree(netcp_priv->dev, next);
512 			return 0;
513 		}
514 	}
515 	spin_unlock_irqrestore(&netcp_priv->lock, flags);
516 	return -ENOENT;
517 }
518 EXPORT_SYMBOL_GPL(netcp_unregister_txhook);
519 
520 int netcp_register_rxhook(struct netcp_intf *netcp_priv, int order,
521 			  netcp_hook_rtn *hook_rtn, void *hook_data)
522 {
523 	struct netcp_hook_list *entry;
524 	struct netcp_hook_list *next;
525 	unsigned long flags;
526 
527 	entry = devm_kzalloc(netcp_priv->dev, sizeof(*entry), GFP_KERNEL);
528 	if (!entry)
529 		return -ENOMEM;
530 
531 	entry->hook_rtn  = hook_rtn;
532 	entry->hook_data = hook_data;
533 	entry->order     = order;
534 
535 	spin_lock_irqsave(&netcp_priv->lock, flags);
536 	list_for_each_entry(next, &netcp_priv->rxhook_list_head, list) {
537 		if (next->order > order)
538 			break;
539 	}
540 	__list_add(&entry->list, next->list.prev, &next->list);
541 	spin_unlock_irqrestore(&netcp_priv->lock, flags);
542 
543 	return 0;
544 }
545 EXPORT_SYMBOL_GPL(netcp_register_rxhook);
546 
547 int netcp_unregister_rxhook(struct netcp_intf *netcp_priv, int order,
548 			    netcp_hook_rtn *hook_rtn, void *hook_data)
549 {
550 	struct netcp_hook_list *next, *n;
551 	unsigned long flags;
552 
553 	spin_lock_irqsave(&netcp_priv->lock, flags);
554 	list_for_each_entry_safe(next, n, &netcp_priv->rxhook_list_head, list) {
555 		if ((next->order     == order) &&
556 		    (next->hook_rtn  == hook_rtn) &&
557 		    (next->hook_data == hook_data)) {
558 			list_del(&next->list);
559 			spin_unlock_irqrestore(&netcp_priv->lock, flags);
560 			devm_kfree(netcp_priv->dev, next);
561 			return 0;
562 		}
563 	}
564 	spin_unlock_irqrestore(&netcp_priv->lock, flags);
565 
566 	return -ENOENT;
567 }
568 EXPORT_SYMBOL_GPL(netcp_unregister_rxhook);
569 
570 static void netcp_frag_free(bool is_frag, void *ptr)
571 {
572 	if (is_frag)
573 		skb_free_frag(ptr);
574 	else
575 		kfree(ptr);
576 }
577 
578 static void netcp_free_rx_desc_chain(struct netcp_intf *netcp,
579 				     struct knav_dma_desc *desc)
580 {
581 	struct knav_dma_desc *ndesc;
582 	dma_addr_t dma_desc, dma_buf;
583 	unsigned int buf_len, dma_sz = sizeof(*ndesc);
584 	void *buf_ptr;
585 	u32 tmp;
586 
587 	get_words(&dma_desc, 1, &desc->next_desc);
588 
589 	while (dma_desc) {
590 		ndesc = knav_pool_desc_unmap(netcp->rx_pool, dma_desc, dma_sz);
591 		if (unlikely(!ndesc)) {
592 			dev_err(netcp->ndev_dev, "failed to unmap Rx desc\n");
593 			break;
594 		}
595 		get_pkt_info(&dma_buf, &tmp, &dma_desc, ndesc);
596 		/* warning!!!! We are retrieving the virtual ptr in the sw_data
597 		 * field as a 32bit value. Will not work on 64bit machines
598 		 */
599 		buf_ptr = (void *)GET_SW_DATA0(ndesc);
600 		buf_len = (int)GET_SW_DATA1(desc);
601 		dma_unmap_page(netcp->dev, dma_buf, PAGE_SIZE, DMA_FROM_DEVICE);
602 		__free_page(buf_ptr);
603 		knav_pool_desc_put(netcp->rx_pool, desc);
604 	}
605 	/* warning!!!! We are retrieving the virtual ptr in the sw_data
606 	 * field as a 32bit value. Will not work on 64bit machines
607 	 */
608 	buf_ptr = (void *)GET_SW_DATA0(desc);
609 	buf_len = (int)GET_SW_DATA1(desc);
610 
611 	if (buf_ptr)
612 		netcp_frag_free(buf_len <= PAGE_SIZE, buf_ptr);
613 	knav_pool_desc_put(netcp->rx_pool, desc);
614 }
615 
616 static void netcp_empty_rx_queue(struct netcp_intf *netcp)
617 {
618 	struct netcp_stats *rx_stats = &netcp->stats;
619 	struct knav_dma_desc *desc;
620 	unsigned int dma_sz;
621 	dma_addr_t dma;
622 
623 	for (; ;) {
624 		dma = knav_queue_pop(netcp->rx_queue, &dma_sz);
625 		if (!dma)
626 			break;
627 
628 		desc = knav_pool_desc_unmap(netcp->rx_pool, dma, dma_sz);
629 		if (unlikely(!desc)) {
630 			dev_err(netcp->ndev_dev, "%s: failed to unmap Rx desc\n",
631 				__func__);
632 			rx_stats->rx_errors++;
633 			continue;
634 		}
635 		netcp_free_rx_desc_chain(netcp, desc);
636 		rx_stats->rx_dropped++;
637 	}
638 }
639 
640 static int netcp_process_one_rx_packet(struct netcp_intf *netcp)
641 {
642 	struct netcp_stats *rx_stats = &netcp->stats;
643 	unsigned int dma_sz, buf_len, org_buf_len;
644 	struct knav_dma_desc *desc, *ndesc;
645 	unsigned int pkt_sz = 0, accum_sz;
646 	struct netcp_hook_list *rx_hook;
647 	dma_addr_t dma_desc, dma_buff;
648 	struct netcp_packet p_info;
649 	struct sk_buff *skb;
650 	void *org_buf_ptr;
651 	u32 tmp;
652 
653 	dma_desc = knav_queue_pop(netcp->rx_queue, &dma_sz);
654 	if (!dma_desc)
655 		return -1;
656 
657 	desc = knav_pool_desc_unmap(netcp->rx_pool, dma_desc, dma_sz);
658 	if (unlikely(!desc)) {
659 		dev_err(netcp->ndev_dev, "failed to unmap Rx desc\n");
660 		return 0;
661 	}
662 
663 	get_pkt_info(&dma_buff, &buf_len, &dma_desc, desc);
664 	/* warning!!!! We are retrieving the virtual ptr in the sw_data
665 	 * field as a 32bit value. Will not work on 64bit machines
666 	 */
667 	org_buf_ptr = (void *)GET_SW_DATA0(desc);
668 	org_buf_len = (int)GET_SW_DATA1(desc);
669 
670 	if (unlikely(!org_buf_ptr)) {
671 		dev_err(netcp->ndev_dev, "NULL bufptr in desc\n");
672 		goto free_desc;
673 	}
674 
675 	pkt_sz &= KNAV_DMA_DESC_PKT_LEN_MASK;
676 	accum_sz = buf_len;
677 	dma_unmap_single(netcp->dev, dma_buff, buf_len, DMA_FROM_DEVICE);
678 
679 	/* Build a new sk_buff for the primary buffer */
680 	skb = build_skb(org_buf_ptr, org_buf_len);
681 	if (unlikely(!skb)) {
682 		dev_err(netcp->ndev_dev, "build_skb() failed\n");
683 		goto free_desc;
684 	}
685 
686 	/* update data, tail and len */
687 	skb_reserve(skb, NETCP_SOP_OFFSET);
688 	__skb_put(skb, buf_len);
689 
690 	/* Fill in the page fragment list */
691 	while (dma_desc) {
692 		struct page *page;
693 
694 		ndesc = knav_pool_desc_unmap(netcp->rx_pool, dma_desc, dma_sz);
695 		if (unlikely(!ndesc)) {
696 			dev_err(netcp->ndev_dev, "failed to unmap Rx desc\n");
697 			goto free_desc;
698 		}
699 
700 		get_pkt_info(&dma_buff, &buf_len, &dma_desc, ndesc);
701 		/* warning!!!! We are retrieving the virtual ptr in the sw_data
702 		 * field as a 32bit value. Will not work on 64bit machines
703 		 */
704 		page = (struct page *)GET_SW_DATA0(ndesc);
705 
706 		if (likely(dma_buff && buf_len && page)) {
707 			dma_unmap_page(netcp->dev, dma_buff, PAGE_SIZE,
708 				       DMA_FROM_DEVICE);
709 		} else {
710 			dev_err(netcp->ndev_dev, "Bad Rx desc dma_buff(%pad), len(%d), page(%p)\n",
711 				&dma_buff, buf_len, page);
712 			goto free_desc;
713 		}
714 
715 		skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, page,
716 				offset_in_page(dma_buff), buf_len, PAGE_SIZE);
717 		accum_sz += buf_len;
718 
719 		/* Free the descriptor */
720 		knav_pool_desc_put(netcp->rx_pool, ndesc);
721 	}
722 
723 	/* check for packet len and warn */
724 	if (unlikely(pkt_sz != accum_sz))
725 		dev_dbg(netcp->ndev_dev, "mismatch in packet size(%d) & sum of fragments(%d)\n",
726 			pkt_sz, accum_sz);
727 
728 	/* Newer version of the Ethernet switch can trim the Ethernet FCS
729 	 * from the packet and is indicated in hw_cap. So trim it only for
730 	 * older h/w
731 	 */
732 	if (!(netcp->hw_cap & ETH_SW_CAN_REMOVE_ETH_FCS))
733 		__pskb_trim(skb, skb->len - ETH_FCS_LEN);
734 
735 	/* Call each of the RX hooks */
736 	p_info.skb = skb;
737 	skb->dev = netcp->ndev;
738 	p_info.rxtstamp_complete = false;
739 	get_desc_info(&tmp, &p_info.eflags, desc);
740 	p_info.epib = desc->epib;
741 	p_info.psdata = (u32 __force *)desc->psdata;
742 	p_info.eflags = ((p_info.eflags >> KNAV_DMA_DESC_EFLAGS_SHIFT) &
743 			 KNAV_DMA_DESC_EFLAGS_MASK);
744 	list_for_each_entry(rx_hook, &netcp->rxhook_list_head, list) {
745 		int ret;
746 
747 		ret = rx_hook->hook_rtn(rx_hook->order, rx_hook->hook_data,
748 					&p_info);
749 		if (unlikely(ret)) {
750 			dev_err(netcp->ndev_dev, "RX hook %d failed: %d\n",
751 				rx_hook->order, ret);
752 			/* Free the primary descriptor */
753 			rx_stats->rx_dropped++;
754 			knav_pool_desc_put(netcp->rx_pool, desc);
755 			dev_kfree_skb(skb);
756 			return 0;
757 		}
758 	}
759 	/* Free the primary descriptor */
760 	knav_pool_desc_put(netcp->rx_pool, desc);
761 
762 	u64_stats_update_begin(&rx_stats->syncp_rx);
763 	rx_stats->rx_packets++;
764 	rx_stats->rx_bytes += skb->len;
765 	u64_stats_update_end(&rx_stats->syncp_rx);
766 
767 	/* push skb up the stack */
768 	skb->protocol = eth_type_trans(skb, netcp->ndev);
769 	netif_receive_skb(skb);
770 	return 0;
771 
772 free_desc:
773 	netcp_free_rx_desc_chain(netcp, desc);
774 	rx_stats->rx_errors++;
775 	return 0;
776 }
777 
778 static int netcp_process_rx_packets(struct netcp_intf *netcp,
779 				    unsigned int budget)
780 {
781 	int i;
782 
783 	for (i = 0; (i < budget) && !netcp_process_one_rx_packet(netcp); i++)
784 		;
785 	return i;
786 }
787 
788 /* Release descriptors and attached buffers from Rx FDQ */
789 static void netcp_free_rx_buf(struct netcp_intf *netcp, int fdq)
790 {
791 	struct knav_dma_desc *desc;
792 	unsigned int buf_len, dma_sz;
793 	dma_addr_t dma;
794 	void *buf_ptr;
795 
796 	/* Allocate descriptor */
797 	while ((dma = knav_queue_pop(netcp->rx_fdq[fdq], &dma_sz))) {
798 		desc = knav_pool_desc_unmap(netcp->rx_pool, dma, dma_sz);
799 		if (unlikely(!desc)) {
800 			dev_err(netcp->ndev_dev, "failed to unmap Rx desc\n");
801 			continue;
802 		}
803 
804 		get_org_pkt_info(&dma, &buf_len, desc);
805 		/* warning!!!! We are retrieving the virtual ptr in the sw_data
806 		 * field as a 32bit value. Will not work on 64bit machines
807 		 */
808 		buf_ptr = (void *)GET_SW_DATA0(desc);
809 
810 		if (unlikely(!dma)) {
811 			dev_err(netcp->ndev_dev, "NULL orig_buff in desc\n");
812 			knav_pool_desc_put(netcp->rx_pool, desc);
813 			continue;
814 		}
815 
816 		if (unlikely(!buf_ptr)) {
817 			dev_err(netcp->ndev_dev, "NULL bufptr in desc\n");
818 			knav_pool_desc_put(netcp->rx_pool, desc);
819 			continue;
820 		}
821 
822 		if (fdq == 0) {
823 			dma_unmap_single(netcp->dev, dma, buf_len,
824 					 DMA_FROM_DEVICE);
825 			netcp_frag_free((buf_len <= PAGE_SIZE), buf_ptr);
826 		} else {
827 			dma_unmap_page(netcp->dev, dma, buf_len,
828 				       DMA_FROM_DEVICE);
829 			__free_page(buf_ptr);
830 		}
831 
832 		knav_pool_desc_put(netcp->rx_pool, desc);
833 	}
834 }
835 
836 static void netcp_rxpool_free(struct netcp_intf *netcp)
837 {
838 	int i;
839 
840 	for (i = 0; i < KNAV_DMA_FDQ_PER_CHAN &&
841 	     !IS_ERR_OR_NULL(netcp->rx_fdq[i]); i++)
842 		netcp_free_rx_buf(netcp, i);
843 
844 	if (knav_pool_count(netcp->rx_pool) != netcp->rx_pool_size)
845 		dev_err(netcp->ndev_dev, "Lost Rx (%d) descriptors\n",
846 			netcp->rx_pool_size - knav_pool_count(netcp->rx_pool));
847 
848 	knav_pool_destroy(netcp->rx_pool);
849 	netcp->rx_pool = NULL;
850 }
851 
852 static int netcp_allocate_rx_buf(struct netcp_intf *netcp, int fdq)
853 {
854 	struct knav_dma_desc *hwdesc;
855 	unsigned int buf_len, dma_sz;
856 	u32 desc_info, pkt_info;
857 	struct page *page;
858 	dma_addr_t dma;
859 	void *bufptr;
860 	u32 sw_data[2];
861 
862 	/* Allocate descriptor */
863 	hwdesc = knav_pool_desc_get(netcp->rx_pool);
864 	if (IS_ERR_OR_NULL(hwdesc)) {
865 		dev_dbg(netcp->ndev_dev, "out of rx pool desc\n");
866 		return -ENOMEM;
867 	}
868 
869 	if (likely(fdq == 0)) {
870 		unsigned int primary_buf_len;
871 		/* Allocate a primary receive queue entry */
872 		buf_len = NETCP_PACKET_SIZE + NETCP_SOP_OFFSET;
873 		primary_buf_len = SKB_DATA_ALIGN(buf_len) +
874 				SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
875 
876 		bufptr = netdev_alloc_frag(primary_buf_len);
877 		sw_data[1] = primary_buf_len;
878 
879 		if (unlikely(!bufptr)) {
880 			dev_warn_ratelimited(netcp->ndev_dev,
881 					     "Primary RX buffer alloc failed\n");
882 			goto fail;
883 		}
884 		dma = dma_map_single(netcp->dev, bufptr, buf_len,
885 				     DMA_TO_DEVICE);
886 		if (unlikely(dma_mapping_error(netcp->dev, dma)))
887 			goto fail;
888 
889 		/* warning!!!! We are saving the virtual ptr in the sw_data
890 		 * field as a 32bit value. Will not work on 64bit machines
891 		 */
892 		sw_data[0] = (u32)bufptr;
893 	} else {
894 		/* Allocate a secondary receive queue entry */
895 		page = alloc_page(GFP_ATOMIC | GFP_DMA);
896 		if (unlikely(!page)) {
897 			dev_warn_ratelimited(netcp->ndev_dev, "Secondary page alloc failed\n");
898 			goto fail;
899 		}
900 		buf_len = PAGE_SIZE;
901 		dma = dma_map_page(netcp->dev, page, 0, buf_len, DMA_TO_DEVICE);
902 		/* warning!!!! We are saving the virtual ptr in the sw_data
903 		 * field as a 32bit value. Will not work on 64bit machines
904 		 */
905 		sw_data[0] = (u32)page;
906 		sw_data[1] = 0;
907 	}
908 
909 	desc_info =  KNAV_DMA_DESC_PS_INFO_IN_DESC;
910 	desc_info |= buf_len & KNAV_DMA_DESC_PKT_LEN_MASK;
911 	pkt_info =  KNAV_DMA_DESC_HAS_EPIB;
912 	pkt_info |= KNAV_DMA_NUM_PS_WORDS << KNAV_DMA_DESC_PSLEN_SHIFT;
913 	pkt_info |= (netcp->rx_queue_id & KNAV_DMA_DESC_RETQ_MASK) <<
914 		    KNAV_DMA_DESC_RETQ_SHIFT;
915 	set_org_pkt_info(dma, buf_len, hwdesc);
916 	SET_SW_DATA0(sw_data[0], hwdesc);
917 	SET_SW_DATA1(sw_data[1], hwdesc);
918 	set_desc_info(desc_info, pkt_info, hwdesc);
919 
920 	/* Push to FDQs */
921 	knav_pool_desc_map(netcp->rx_pool, hwdesc, sizeof(*hwdesc), &dma,
922 			   &dma_sz);
923 	knav_queue_push(netcp->rx_fdq[fdq], dma, sizeof(*hwdesc), 0);
924 	return 0;
925 
926 fail:
927 	knav_pool_desc_put(netcp->rx_pool, hwdesc);
928 	return -ENOMEM;
929 }
930 
931 /* Refill Rx FDQ with descriptors & attached buffers */
932 static void netcp_rxpool_refill(struct netcp_intf *netcp)
933 {
934 	u32 fdq_deficit[KNAV_DMA_FDQ_PER_CHAN] = {0};
935 	int i, ret = 0;
936 
937 	/* Calculate the FDQ deficit and refill */
938 	for (i = 0; i < KNAV_DMA_FDQ_PER_CHAN && netcp->rx_fdq[i]; i++) {
939 		fdq_deficit[i] = netcp->rx_queue_depths[i] -
940 				 knav_queue_get_count(netcp->rx_fdq[i]);
941 
942 		while (fdq_deficit[i]-- && !ret)
943 			ret = netcp_allocate_rx_buf(netcp, i);
944 	} /* end for fdqs */
945 }
946 
947 /* NAPI poll */
948 static int netcp_rx_poll(struct napi_struct *napi, int budget)
949 {
950 	struct netcp_intf *netcp = container_of(napi, struct netcp_intf,
951 						rx_napi);
952 	unsigned int packets;
953 
954 	packets = netcp_process_rx_packets(netcp, budget);
955 
956 	netcp_rxpool_refill(netcp);
957 	if (packets < budget) {
958 		napi_complete_done(&netcp->rx_napi, packets);
959 		knav_queue_enable_notify(netcp->rx_queue);
960 	}
961 
962 	return packets;
963 }
964 
965 static void netcp_rx_notify(void *arg)
966 {
967 	struct netcp_intf *netcp = arg;
968 
969 	knav_queue_disable_notify(netcp->rx_queue);
970 	napi_schedule(&netcp->rx_napi);
971 }
972 
973 static void netcp_free_tx_desc_chain(struct netcp_intf *netcp,
974 				     struct knav_dma_desc *desc,
975 				     unsigned int desc_sz)
976 {
977 	struct knav_dma_desc *ndesc = desc;
978 	dma_addr_t dma_desc, dma_buf;
979 	unsigned int buf_len;
980 
981 	while (ndesc) {
982 		get_pkt_info(&dma_buf, &buf_len, &dma_desc, ndesc);
983 
984 		if (dma_buf && buf_len)
985 			dma_unmap_single(netcp->dev, dma_buf, buf_len,
986 					 DMA_TO_DEVICE);
987 		else
988 			dev_warn(netcp->ndev_dev, "bad Tx desc buf(%pad), len(%d)\n",
989 				 &dma_buf, buf_len);
990 
991 		knav_pool_desc_put(netcp->tx_pool, ndesc);
992 		ndesc = NULL;
993 		if (dma_desc) {
994 			ndesc = knav_pool_desc_unmap(netcp->tx_pool, dma_desc,
995 						     desc_sz);
996 			if (!ndesc)
997 				dev_err(netcp->ndev_dev, "failed to unmap Tx desc\n");
998 		}
999 	}
1000 }
1001 
1002 static int netcp_process_tx_compl_packets(struct netcp_intf *netcp,
1003 					  unsigned int budget)
1004 {
1005 	struct netcp_stats *tx_stats = &netcp->stats;
1006 	struct knav_dma_desc *desc;
1007 	struct netcp_tx_cb *tx_cb;
1008 	struct sk_buff *skb;
1009 	unsigned int dma_sz;
1010 	dma_addr_t dma;
1011 	int pkts = 0;
1012 
1013 	while (budget--) {
1014 		dma = knav_queue_pop(netcp->tx_compl_q, &dma_sz);
1015 		if (!dma)
1016 			break;
1017 		desc = knav_pool_desc_unmap(netcp->tx_pool, dma, dma_sz);
1018 		if (unlikely(!desc)) {
1019 			dev_err(netcp->ndev_dev, "failed to unmap Tx desc\n");
1020 			tx_stats->tx_errors++;
1021 			continue;
1022 		}
1023 
1024 		/* warning!!!! We are retrieving the virtual ptr in the sw_data
1025 		 * field as a 32bit value. Will not work on 64bit machines
1026 		 */
1027 		skb = (struct sk_buff *)GET_SW_DATA0(desc);
1028 		netcp_free_tx_desc_chain(netcp, desc, dma_sz);
1029 		if (!skb) {
1030 			dev_err(netcp->ndev_dev, "No skb in Tx desc\n");
1031 			tx_stats->tx_errors++;
1032 			continue;
1033 		}
1034 
1035 		tx_cb = (struct netcp_tx_cb *)skb->cb;
1036 		if (tx_cb->txtstamp)
1037 			tx_cb->txtstamp(tx_cb->ts_context, skb);
1038 
1039 		if (netif_subqueue_stopped(netcp->ndev, skb) &&
1040 		    netif_running(netcp->ndev) &&
1041 		    (knav_pool_count(netcp->tx_pool) >
1042 		    netcp->tx_resume_threshold)) {
1043 			u16 subqueue = skb_get_queue_mapping(skb);
1044 
1045 			netif_wake_subqueue(netcp->ndev, subqueue);
1046 		}
1047 
1048 		u64_stats_update_begin(&tx_stats->syncp_tx);
1049 		tx_stats->tx_packets++;
1050 		tx_stats->tx_bytes += skb->len;
1051 		u64_stats_update_end(&tx_stats->syncp_tx);
1052 		dev_kfree_skb(skb);
1053 		pkts++;
1054 	}
1055 	return pkts;
1056 }
1057 
1058 static int netcp_tx_poll(struct napi_struct *napi, int budget)
1059 {
1060 	int packets;
1061 	struct netcp_intf *netcp = container_of(napi, struct netcp_intf,
1062 						tx_napi);
1063 
1064 	packets = netcp_process_tx_compl_packets(netcp, budget);
1065 	if (packets < budget) {
1066 		napi_complete(&netcp->tx_napi);
1067 		knav_queue_enable_notify(netcp->tx_compl_q);
1068 	}
1069 
1070 	return packets;
1071 }
1072 
1073 static void netcp_tx_notify(void *arg)
1074 {
1075 	struct netcp_intf *netcp = arg;
1076 
1077 	knav_queue_disable_notify(netcp->tx_compl_q);
1078 	napi_schedule(&netcp->tx_napi);
1079 }
1080 
1081 static struct knav_dma_desc*
1082 netcp_tx_map_skb(struct sk_buff *skb, struct netcp_intf *netcp)
1083 {
1084 	struct knav_dma_desc *desc, *ndesc, *pdesc;
1085 	unsigned int pkt_len = skb_headlen(skb);
1086 	struct device *dev = netcp->dev;
1087 	dma_addr_t dma_addr;
1088 	unsigned int dma_sz;
1089 	int i;
1090 
1091 	/* Map the linear buffer */
1092 	dma_addr = dma_map_single(dev, skb->data, pkt_len, DMA_TO_DEVICE);
1093 	if (unlikely(dma_mapping_error(dev, dma_addr))) {
1094 		dev_err(netcp->ndev_dev, "Failed to map skb buffer\n");
1095 		return NULL;
1096 	}
1097 
1098 	desc = knav_pool_desc_get(netcp->tx_pool);
1099 	if (IS_ERR_OR_NULL(desc)) {
1100 		dev_err(netcp->ndev_dev, "out of TX desc\n");
1101 		dma_unmap_single(dev, dma_addr, pkt_len, DMA_TO_DEVICE);
1102 		return NULL;
1103 	}
1104 
1105 	set_pkt_info(dma_addr, pkt_len, 0, desc);
1106 	if (skb_is_nonlinear(skb)) {
1107 		prefetchw(skb_shinfo(skb));
1108 	} else {
1109 		desc->next_desc = 0;
1110 		goto upd_pkt_len;
1111 	}
1112 
1113 	pdesc = desc;
1114 
1115 	/* Handle the case where skb is fragmented in pages */
1116 	for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1117 		skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1118 		struct page *page = skb_frag_page(frag);
1119 		u32 page_offset = skb_frag_off(frag);
1120 		u32 buf_len = skb_frag_size(frag);
1121 		dma_addr_t desc_dma;
1122 		u32 desc_dma_32;
1123 
1124 		dma_addr = dma_map_page(dev, page, page_offset, buf_len,
1125 					DMA_TO_DEVICE);
1126 		if (unlikely(!dma_addr)) {
1127 			dev_err(netcp->ndev_dev, "Failed to map skb page\n");
1128 			goto free_descs;
1129 		}
1130 
1131 		ndesc = knav_pool_desc_get(netcp->tx_pool);
1132 		if (IS_ERR_OR_NULL(ndesc)) {
1133 			dev_err(netcp->ndev_dev, "out of TX desc for frags\n");
1134 			dma_unmap_page(dev, dma_addr, buf_len, DMA_TO_DEVICE);
1135 			goto free_descs;
1136 		}
1137 
1138 		desc_dma = knav_pool_desc_virt_to_dma(netcp->tx_pool, ndesc);
1139 		set_pkt_info(dma_addr, buf_len, 0, ndesc);
1140 		desc_dma_32 = (u32)desc_dma;
1141 		set_words(&desc_dma_32, 1, &pdesc->next_desc);
1142 		pkt_len += buf_len;
1143 		if (pdesc != desc)
1144 			knav_pool_desc_map(netcp->tx_pool, pdesc,
1145 					   sizeof(*pdesc), &desc_dma, &dma_sz);
1146 		pdesc = ndesc;
1147 	}
1148 	if (pdesc != desc)
1149 		knav_pool_desc_map(netcp->tx_pool, pdesc, sizeof(*pdesc),
1150 				   &dma_addr, &dma_sz);
1151 
1152 	/* frag list based linkage is not supported for now. */
1153 	if (skb_shinfo(skb)->frag_list) {
1154 		dev_err_ratelimited(netcp->ndev_dev, "NETIF_F_FRAGLIST not supported\n");
1155 		goto free_descs;
1156 	}
1157 
1158 upd_pkt_len:
1159 	WARN_ON(pkt_len != skb->len);
1160 
1161 	pkt_len &= KNAV_DMA_DESC_PKT_LEN_MASK;
1162 	set_words(&pkt_len, 1, &desc->desc_info);
1163 	return desc;
1164 
1165 free_descs:
1166 	netcp_free_tx_desc_chain(netcp, desc, sizeof(*desc));
1167 	return NULL;
1168 }
1169 
1170 static int netcp_tx_submit_skb(struct netcp_intf *netcp,
1171 			       struct sk_buff *skb,
1172 			       struct knav_dma_desc *desc)
1173 {
1174 	struct netcp_tx_pipe *tx_pipe = NULL;
1175 	struct netcp_hook_list *tx_hook;
1176 	struct netcp_packet p_info;
1177 	struct netcp_tx_cb *tx_cb;
1178 	unsigned int dma_sz;
1179 	dma_addr_t dma;
1180 	u32 tmp = 0;
1181 	int ret = 0;
1182 
1183 	p_info.netcp = netcp;
1184 	p_info.skb = skb;
1185 	p_info.tx_pipe = NULL;
1186 	p_info.psdata_len = 0;
1187 	p_info.ts_context = NULL;
1188 	p_info.txtstamp = NULL;
1189 	p_info.epib = desc->epib;
1190 	p_info.psdata = (u32 __force *)desc->psdata;
1191 	memset(p_info.epib, 0, KNAV_DMA_NUM_EPIB_WORDS * sizeof(__le32));
1192 
1193 	/* Find out where to inject the packet for transmission */
1194 	list_for_each_entry(tx_hook, &netcp->txhook_list_head, list) {
1195 		ret = tx_hook->hook_rtn(tx_hook->order, tx_hook->hook_data,
1196 					&p_info);
1197 		if (unlikely(ret != 0)) {
1198 			dev_err(netcp->ndev_dev, "TX hook %d rejected the packet with reason(%d)\n",
1199 				tx_hook->order, ret);
1200 			ret = (ret < 0) ? ret : NETDEV_TX_OK;
1201 			goto out;
1202 		}
1203 	}
1204 
1205 	/* Make sure some TX hook claimed the packet */
1206 	tx_pipe = p_info.tx_pipe;
1207 	if (!tx_pipe) {
1208 		dev_err(netcp->ndev_dev, "No TX hook claimed the packet!\n");
1209 		ret = -ENXIO;
1210 		goto out;
1211 	}
1212 
1213 	tx_cb = (struct netcp_tx_cb *)skb->cb;
1214 	tx_cb->ts_context = p_info.ts_context;
1215 	tx_cb->txtstamp = p_info.txtstamp;
1216 
1217 	/* update descriptor */
1218 	if (p_info.psdata_len) {
1219 		/* psdata points to both native-endian and device-endian data */
1220 		__le32 *psdata = (void __force *)p_info.psdata;
1221 
1222 		set_words((u32 *)psdata +
1223 			  (KNAV_DMA_NUM_PS_WORDS - p_info.psdata_len),
1224 			  p_info.psdata_len, psdata);
1225 		tmp |= (p_info.psdata_len & KNAV_DMA_DESC_PSLEN_MASK) <<
1226 			KNAV_DMA_DESC_PSLEN_SHIFT;
1227 	}
1228 
1229 	tmp |= KNAV_DMA_DESC_HAS_EPIB |
1230 		((netcp->tx_compl_qid & KNAV_DMA_DESC_RETQ_MASK) <<
1231 		KNAV_DMA_DESC_RETQ_SHIFT);
1232 
1233 	if (!(tx_pipe->flags & SWITCH_TO_PORT_IN_TAGINFO)) {
1234 		tmp |= ((tx_pipe->switch_to_port & KNAV_DMA_DESC_PSFLAG_MASK) <<
1235 			KNAV_DMA_DESC_PSFLAG_SHIFT);
1236 	}
1237 
1238 	set_words(&tmp, 1, &desc->packet_info);
1239 	/* warning!!!! We are saving the virtual ptr in the sw_data
1240 	 * field as a 32bit value. Will not work on 64bit machines
1241 	 */
1242 	SET_SW_DATA0((u32)skb, desc);
1243 
1244 	if (tx_pipe->flags & SWITCH_TO_PORT_IN_TAGINFO) {
1245 		tmp = tx_pipe->switch_to_port;
1246 		set_words(&tmp, 1, &desc->tag_info);
1247 	}
1248 
1249 	/* submit packet descriptor */
1250 	ret = knav_pool_desc_map(netcp->tx_pool, desc, sizeof(*desc), &dma,
1251 				 &dma_sz);
1252 	if (unlikely(ret)) {
1253 		dev_err(netcp->ndev_dev, "%s() failed to map desc\n", __func__);
1254 		ret = -ENOMEM;
1255 		goto out;
1256 	}
1257 	skb_tx_timestamp(skb);
1258 	knav_queue_push(tx_pipe->dma_queue, dma, dma_sz, 0);
1259 
1260 out:
1261 	return ret;
1262 }
1263 
1264 /* Submit the packet */
1265 static int netcp_ndo_start_xmit(struct sk_buff *skb, struct net_device *ndev)
1266 {
1267 	struct netcp_intf *netcp = netdev_priv(ndev);
1268 	struct netcp_stats *tx_stats = &netcp->stats;
1269 	int subqueue = skb_get_queue_mapping(skb);
1270 	struct knav_dma_desc *desc;
1271 	int desc_count, ret = 0;
1272 
1273 	if (unlikely(skb->len <= 0)) {
1274 		dev_kfree_skb(skb);
1275 		return NETDEV_TX_OK;
1276 	}
1277 
1278 	if (unlikely(skb->len < NETCP_MIN_PACKET_SIZE)) {
1279 		ret = skb_padto(skb, NETCP_MIN_PACKET_SIZE);
1280 		if (ret < 0) {
1281 			/* If we get here, the skb has already been dropped */
1282 			dev_warn(netcp->ndev_dev, "padding failed (%d), packet dropped\n",
1283 				 ret);
1284 			tx_stats->tx_dropped++;
1285 			return ret;
1286 		}
1287 		skb->len = NETCP_MIN_PACKET_SIZE;
1288 	}
1289 
1290 	desc = netcp_tx_map_skb(skb, netcp);
1291 	if (unlikely(!desc)) {
1292 		netif_stop_subqueue(ndev, subqueue);
1293 		ret = -ENOBUFS;
1294 		goto drop;
1295 	}
1296 
1297 	ret = netcp_tx_submit_skb(netcp, skb, desc);
1298 	if (ret)
1299 		goto drop;
1300 
1301 	/* Check Tx pool count & stop subqueue if needed */
1302 	desc_count = knav_pool_count(netcp->tx_pool);
1303 	if (desc_count < netcp->tx_pause_threshold) {
1304 		dev_dbg(netcp->ndev_dev, "pausing tx, count(%d)\n", desc_count);
1305 		netif_stop_subqueue(ndev, subqueue);
1306 	}
1307 	return NETDEV_TX_OK;
1308 
1309 drop:
1310 	tx_stats->tx_dropped++;
1311 	if (desc)
1312 		netcp_free_tx_desc_chain(netcp, desc, sizeof(*desc));
1313 	dev_kfree_skb(skb);
1314 	return ret;
1315 }
1316 
1317 int netcp_txpipe_close(struct netcp_tx_pipe *tx_pipe)
1318 {
1319 	if (tx_pipe->dma_channel) {
1320 		knav_dma_close_channel(tx_pipe->dma_channel);
1321 		tx_pipe->dma_channel = NULL;
1322 	}
1323 	return 0;
1324 }
1325 EXPORT_SYMBOL_GPL(netcp_txpipe_close);
1326 
1327 int netcp_txpipe_open(struct netcp_tx_pipe *tx_pipe)
1328 {
1329 	struct device *dev = tx_pipe->netcp_device->device;
1330 	struct knav_dma_cfg config;
1331 	int ret = 0;
1332 	u8 name[16];
1333 
1334 	memset(&config, 0, sizeof(config));
1335 	config.direction = DMA_MEM_TO_DEV;
1336 	config.u.tx.filt_einfo = false;
1337 	config.u.tx.filt_pswords = false;
1338 	config.u.tx.priority = DMA_PRIO_MED_L;
1339 
1340 	tx_pipe->dma_channel = knav_dma_open_channel(dev,
1341 				tx_pipe->dma_chan_name, &config);
1342 	if (IS_ERR(tx_pipe->dma_channel)) {
1343 		dev_err(dev, "failed opening tx chan(%s)\n",
1344 			tx_pipe->dma_chan_name);
1345 		ret = PTR_ERR(tx_pipe->dma_channel);
1346 		goto err;
1347 	}
1348 
1349 	snprintf(name, sizeof(name), "tx-pipe-%s", dev_name(dev));
1350 	tx_pipe->dma_queue = knav_queue_open(name, tx_pipe->dma_queue_id,
1351 					     KNAV_QUEUE_SHARED);
1352 	if (IS_ERR(tx_pipe->dma_queue)) {
1353 		dev_err(dev, "Could not open DMA queue for channel \"%s\": %pe\n",
1354 			name, tx_pipe->dma_queue);
1355 		ret = PTR_ERR(tx_pipe->dma_queue);
1356 		goto err;
1357 	}
1358 
1359 	dev_dbg(dev, "opened tx pipe %s\n", name);
1360 	return 0;
1361 
1362 err:
1363 	if (!IS_ERR_OR_NULL(tx_pipe->dma_channel))
1364 		knav_dma_close_channel(tx_pipe->dma_channel);
1365 	tx_pipe->dma_channel = NULL;
1366 	return ret;
1367 }
1368 EXPORT_SYMBOL_GPL(netcp_txpipe_open);
1369 
1370 int netcp_txpipe_init(struct netcp_tx_pipe *tx_pipe,
1371 		      struct netcp_device *netcp_device,
1372 		      const char *dma_chan_name, unsigned int dma_queue_id)
1373 {
1374 	memset(tx_pipe, 0, sizeof(*tx_pipe));
1375 	tx_pipe->netcp_device = netcp_device;
1376 	tx_pipe->dma_chan_name = dma_chan_name;
1377 	tx_pipe->dma_queue_id = dma_queue_id;
1378 	return 0;
1379 }
1380 EXPORT_SYMBOL_GPL(netcp_txpipe_init);
1381 
1382 static struct netcp_addr *netcp_addr_find(struct netcp_intf *netcp,
1383 					  const u8 *addr,
1384 					  enum netcp_addr_type type)
1385 {
1386 	struct netcp_addr *naddr;
1387 
1388 	list_for_each_entry(naddr, &netcp->addr_list, node) {
1389 		if (naddr->type != type)
1390 			continue;
1391 		if (addr && memcmp(addr, naddr->addr, ETH_ALEN))
1392 			continue;
1393 		return naddr;
1394 	}
1395 
1396 	return NULL;
1397 }
1398 
1399 static struct netcp_addr *netcp_addr_add(struct netcp_intf *netcp,
1400 					 const u8 *addr,
1401 					 enum netcp_addr_type type)
1402 {
1403 	struct netcp_addr *naddr;
1404 
1405 	naddr = devm_kmalloc(netcp->dev, sizeof(*naddr), GFP_ATOMIC);
1406 	if (!naddr)
1407 		return NULL;
1408 
1409 	naddr->type = type;
1410 	naddr->flags = 0;
1411 	naddr->netcp = netcp;
1412 	if (addr)
1413 		ether_addr_copy(naddr->addr, addr);
1414 	else
1415 		eth_zero_addr(naddr->addr);
1416 	list_add_tail(&naddr->node, &netcp->addr_list);
1417 
1418 	return naddr;
1419 }
1420 
1421 static void netcp_addr_del(struct netcp_intf *netcp, struct netcp_addr *naddr)
1422 {
1423 	list_del(&naddr->node);
1424 	devm_kfree(netcp->dev, naddr);
1425 }
1426 
1427 static void netcp_addr_clear_mark(struct netcp_intf *netcp)
1428 {
1429 	struct netcp_addr *naddr;
1430 
1431 	list_for_each_entry(naddr, &netcp->addr_list, node)
1432 		naddr->flags = 0;
1433 }
1434 
1435 static void netcp_addr_add_mark(struct netcp_intf *netcp, const u8 *addr,
1436 				enum netcp_addr_type type)
1437 {
1438 	struct netcp_addr *naddr;
1439 
1440 	naddr = netcp_addr_find(netcp, addr, type);
1441 	if (naddr) {
1442 		naddr->flags |= ADDR_VALID;
1443 		return;
1444 	}
1445 
1446 	naddr = netcp_addr_add(netcp, addr, type);
1447 	if (!WARN_ON(!naddr))
1448 		naddr->flags |= ADDR_NEW;
1449 }
1450 
1451 static void netcp_addr_sweep_del(struct netcp_intf *netcp)
1452 {
1453 	struct netcp_addr *naddr, *tmp;
1454 	struct netcp_intf_modpriv *priv;
1455 	struct netcp_module *module;
1456 	int error;
1457 
1458 	list_for_each_entry_safe(naddr, tmp, &netcp->addr_list, node) {
1459 		if (naddr->flags & (ADDR_VALID | ADDR_NEW))
1460 			continue;
1461 		dev_dbg(netcp->ndev_dev, "deleting address %pM, type %x\n",
1462 			naddr->addr, naddr->type);
1463 		for_each_module(netcp, priv) {
1464 			module = priv->netcp_module;
1465 			if (!module->del_addr)
1466 				continue;
1467 			error = module->del_addr(priv->module_priv,
1468 						 naddr);
1469 			WARN_ON(error);
1470 		}
1471 		netcp_addr_del(netcp, naddr);
1472 	}
1473 }
1474 
1475 static void netcp_addr_sweep_add(struct netcp_intf *netcp)
1476 {
1477 	struct netcp_addr *naddr, *tmp;
1478 	struct netcp_intf_modpriv *priv;
1479 	struct netcp_module *module;
1480 	int error;
1481 
1482 	list_for_each_entry_safe(naddr, tmp, &netcp->addr_list, node) {
1483 		if (!(naddr->flags & ADDR_NEW))
1484 			continue;
1485 		dev_dbg(netcp->ndev_dev, "adding address %pM, type %x\n",
1486 			naddr->addr, naddr->type);
1487 
1488 		for_each_module(netcp, priv) {
1489 			module = priv->netcp_module;
1490 			if (!module->add_addr)
1491 				continue;
1492 			error = module->add_addr(priv->module_priv, naddr);
1493 			WARN_ON(error);
1494 		}
1495 	}
1496 }
1497 
1498 static int netcp_set_promiscuous(struct netcp_intf *netcp, bool promisc)
1499 {
1500 	struct netcp_intf_modpriv *priv;
1501 	struct netcp_module *module;
1502 	int error;
1503 
1504 	for_each_module(netcp, priv) {
1505 		module = priv->netcp_module;
1506 		if (!module->set_rx_mode)
1507 			continue;
1508 
1509 		error = module->set_rx_mode(priv->module_priv, promisc);
1510 		if (error)
1511 			return error;
1512 	}
1513 	return 0;
1514 }
1515 
1516 static void netcp_set_rx_mode(struct net_device *ndev)
1517 {
1518 	struct netcp_intf *netcp = netdev_priv(ndev);
1519 	struct netdev_hw_addr *ndev_addr;
1520 	bool promisc;
1521 
1522 	promisc = (ndev->flags & IFF_PROMISC ||
1523 		   ndev->flags & IFF_ALLMULTI ||
1524 		   netdev_mc_count(ndev) > NETCP_MAX_MCAST_ADDR);
1525 
1526 	spin_lock(&netcp->lock);
1527 	/* first clear all marks */
1528 	netcp_addr_clear_mark(netcp);
1529 
1530 	/* next add new entries, mark existing ones */
1531 	netcp_addr_add_mark(netcp, ndev->broadcast, ADDR_BCAST);
1532 	for_each_dev_addr(ndev, ndev_addr)
1533 		netcp_addr_add_mark(netcp, ndev_addr->addr, ADDR_DEV);
1534 	netdev_for_each_uc_addr(ndev_addr, ndev)
1535 		netcp_addr_add_mark(netcp, ndev_addr->addr, ADDR_UCAST);
1536 	netdev_for_each_mc_addr(ndev_addr, ndev)
1537 		netcp_addr_add_mark(netcp, ndev_addr->addr, ADDR_MCAST);
1538 
1539 	if (promisc)
1540 		netcp_addr_add_mark(netcp, NULL, ADDR_ANY);
1541 
1542 	/* finally sweep and callout into modules */
1543 	netcp_addr_sweep_del(netcp);
1544 	netcp_addr_sweep_add(netcp);
1545 	netcp_set_promiscuous(netcp, promisc);
1546 	spin_unlock(&netcp->lock);
1547 }
1548 
1549 static void netcp_free_navigator_resources(struct netcp_intf *netcp)
1550 {
1551 	int i;
1552 
1553 	if (netcp->rx_channel) {
1554 		knav_dma_close_channel(netcp->rx_channel);
1555 		netcp->rx_channel = NULL;
1556 	}
1557 
1558 	if (!IS_ERR_OR_NULL(netcp->rx_pool))
1559 		netcp_rxpool_free(netcp);
1560 
1561 	if (!IS_ERR_OR_NULL(netcp->rx_queue)) {
1562 		knav_queue_close(netcp->rx_queue);
1563 		netcp->rx_queue = NULL;
1564 	}
1565 
1566 	for (i = 0; i < KNAV_DMA_FDQ_PER_CHAN &&
1567 	     !IS_ERR_OR_NULL(netcp->rx_fdq[i]) ; ++i) {
1568 		knav_queue_close(netcp->rx_fdq[i]);
1569 		netcp->rx_fdq[i] = NULL;
1570 	}
1571 
1572 	if (!IS_ERR_OR_NULL(netcp->tx_compl_q)) {
1573 		knav_queue_close(netcp->tx_compl_q);
1574 		netcp->tx_compl_q = NULL;
1575 	}
1576 
1577 	if (!IS_ERR_OR_NULL(netcp->tx_pool)) {
1578 		knav_pool_destroy(netcp->tx_pool);
1579 		netcp->tx_pool = NULL;
1580 	}
1581 }
1582 
1583 static int netcp_setup_navigator_resources(struct net_device *ndev)
1584 {
1585 	struct netcp_intf *netcp = netdev_priv(ndev);
1586 	struct knav_queue_notify_config notify_cfg;
1587 	struct knav_dma_cfg config;
1588 	u32 last_fdq = 0;
1589 	u8 name[16];
1590 	int ret;
1591 	int i;
1592 
1593 	/* Create Rx/Tx descriptor pools */
1594 	snprintf(name, sizeof(name), "rx-pool-%s", ndev->name);
1595 	netcp->rx_pool = knav_pool_create(name, netcp->rx_pool_size,
1596 						netcp->rx_pool_region_id);
1597 	if (IS_ERR_OR_NULL(netcp->rx_pool)) {
1598 		dev_err(netcp->ndev_dev, "Couldn't create rx pool\n");
1599 		ret = PTR_ERR(netcp->rx_pool);
1600 		goto fail;
1601 	}
1602 
1603 	snprintf(name, sizeof(name), "tx-pool-%s", ndev->name);
1604 	netcp->tx_pool = knav_pool_create(name, netcp->tx_pool_size,
1605 						netcp->tx_pool_region_id);
1606 	if (IS_ERR_OR_NULL(netcp->tx_pool)) {
1607 		dev_err(netcp->ndev_dev, "Couldn't create tx pool\n");
1608 		ret = PTR_ERR(netcp->tx_pool);
1609 		goto fail;
1610 	}
1611 
1612 	/* open Tx completion queue */
1613 	snprintf(name, sizeof(name), "tx-compl-%s", ndev->name);
1614 	netcp->tx_compl_q = knav_queue_open(name, netcp->tx_compl_qid, 0);
1615 	if (IS_ERR(netcp->tx_compl_q)) {
1616 		ret = PTR_ERR(netcp->tx_compl_q);
1617 		goto fail;
1618 	}
1619 	netcp->tx_compl_qid = knav_queue_get_id(netcp->tx_compl_q);
1620 
1621 	/* Set notification for Tx completion */
1622 	notify_cfg.fn = netcp_tx_notify;
1623 	notify_cfg.fn_arg = netcp;
1624 	ret = knav_queue_device_control(netcp->tx_compl_q,
1625 					KNAV_QUEUE_SET_NOTIFIER,
1626 					(unsigned long)&notify_cfg);
1627 	if (ret)
1628 		goto fail;
1629 
1630 	knav_queue_disable_notify(netcp->tx_compl_q);
1631 
1632 	/* open Rx completion queue */
1633 	snprintf(name, sizeof(name), "rx-compl-%s", ndev->name);
1634 	netcp->rx_queue = knav_queue_open(name, netcp->rx_queue_id, 0);
1635 	if (IS_ERR(netcp->rx_queue)) {
1636 		ret = PTR_ERR(netcp->rx_queue);
1637 		goto fail;
1638 	}
1639 	netcp->rx_queue_id = knav_queue_get_id(netcp->rx_queue);
1640 
1641 	/* Set notification for Rx completion */
1642 	notify_cfg.fn = netcp_rx_notify;
1643 	notify_cfg.fn_arg = netcp;
1644 	ret = knav_queue_device_control(netcp->rx_queue,
1645 					KNAV_QUEUE_SET_NOTIFIER,
1646 					(unsigned long)&notify_cfg);
1647 	if (ret)
1648 		goto fail;
1649 
1650 	knav_queue_disable_notify(netcp->rx_queue);
1651 
1652 	/* open Rx FDQs */
1653 	for (i = 0; i < KNAV_DMA_FDQ_PER_CHAN && netcp->rx_queue_depths[i];
1654 	     ++i) {
1655 		snprintf(name, sizeof(name), "rx-fdq-%s-%d", ndev->name, i);
1656 		netcp->rx_fdq[i] = knav_queue_open(name, KNAV_QUEUE_GP, 0);
1657 		if (IS_ERR(netcp->rx_fdq[i])) {
1658 			ret = PTR_ERR(netcp->rx_fdq[i]);
1659 			goto fail;
1660 		}
1661 	}
1662 
1663 	memset(&config, 0, sizeof(config));
1664 	config.direction		= DMA_DEV_TO_MEM;
1665 	config.u.rx.einfo_present	= true;
1666 	config.u.rx.psinfo_present	= true;
1667 	config.u.rx.err_mode		= DMA_DROP;
1668 	config.u.rx.desc_type		= DMA_DESC_HOST;
1669 	config.u.rx.psinfo_at_sop	= false;
1670 	config.u.rx.sop_offset		= NETCP_SOP_OFFSET;
1671 	config.u.rx.dst_q		= netcp->rx_queue_id;
1672 	config.u.rx.thresh		= DMA_THRESH_NONE;
1673 
1674 	for (i = 0; i < KNAV_DMA_FDQ_PER_CHAN; ++i) {
1675 		if (netcp->rx_fdq[i])
1676 			last_fdq = knav_queue_get_id(netcp->rx_fdq[i]);
1677 		config.u.rx.fdq[i] = last_fdq;
1678 	}
1679 
1680 	netcp->rx_channel = knav_dma_open_channel(netcp->netcp_device->device,
1681 					netcp->dma_chan_name, &config);
1682 	if (IS_ERR(netcp->rx_channel)) {
1683 		dev_err(netcp->ndev_dev, "failed opening rx chan(%s\n",
1684 			netcp->dma_chan_name);
1685 		ret = PTR_ERR(netcp->rx_channel);
1686 		goto fail;
1687 	}
1688 
1689 	dev_dbg(netcp->ndev_dev, "opened RX channel: %p\n", netcp->rx_channel);
1690 	return 0;
1691 
1692 fail:
1693 	netcp_free_navigator_resources(netcp);
1694 	return ret;
1695 }
1696 
1697 /* Open the device */
1698 static int netcp_ndo_open(struct net_device *ndev)
1699 {
1700 	struct netcp_intf *netcp = netdev_priv(ndev);
1701 	struct netcp_intf_modpriv *intf_modpriv;
1702 	struct netcp_module *module;
1703 	int ret;
1704 
1705 	netif_carrier_off(ndev);
1706 	ret = netcp_setup_navigator_resources(ndev);
1707 	if (ret) {
1708 		dev_err(netcp->ndev_dev, "Failed to setup navigator resources\n");
1709 		goto fail;
1710 	}
1711 
1712 	for_each_module(netcp, intf_modpriv) {
1713 		module = intf_modpriv->netcp_module;
1714 		if (module->open) {
1715 			ret = module->open(intf_modpriv->module_priv, ndev);
1716 			if (ret != 0) {
1717 				dev_err(netcp->ndev_dev, "module open failed\n");
1718 				goto fail_open;
1719 			}
1720 		}
1721 	}
1722 
1723 	napi_enable(&netcp->rx_napi);
1724 	napi_enable(&netcp->tx_napi);
1725 	knav_queue_enable_notify(netcp->tx_compl_q);
1726 	knav_queue_enable_notify(netcp->rx_queue);
1727 	netcp_rxpool_refill(netcp);
1728 	netif_tx_wake_all_queues(ndev);
1729 	dev_dbg(netcp->ndev_dev, "netcp device %s opened\n", ndev->name);
1730 	return 0;
1731 
1732 fail_open:
1733 	for_each_module(netcp, intf_modpriv) {
1734 		module = intf_modpriv->netcp_module;
1735 		if (module->close)
1736 			module->close(intf_modpriv->module_priv, ndev);
1737 	}
1738 
1739 fail:
1740 	netcp_free_navigator_resources(netcp);
1741 	return ret;
1742 }
1743 
1744 /* Close the device */
1745 static int netcp_ndo_stop(struct net_device *ndev)
1746 {
1747 	struct netcp_intf *netcp = netdev_priv(ndev);
1748 	struct netcp_intf_modpriv *intf_modpriv;
1749 	struct netcp_module *module;
1750 	int err = 0;
1751 
1752 	netif_tx_stop_all_queues(ndev);
1753 	netif_carrier_off(ndev);
1754 	netcp_addr_clear_mark(netcp);
1755 	netcp_addr_sweep_del(netcp);
1756 	knav_queue_disable_notify(netcp->rx_queue);
1757 	knav_queue_disable_notify(netcp->tx_compl_q);
1758 	napi_disable(&netcp->rx_napi);
1759 	napi_disable(&netcp->tx_napi);
1760 
1761 	for_each_module(netcp, intf_modpriv) {
1762 		module = intf_modpriv->netcp_module;
1763 		if (module->close) {
1764 			err = module->close(intf_modpriv->module_priv, ndev);
1765 			if (err != 0)
1766 				dev_err(netcp->ndev_dev, "Close failed\n");
1767 		}
1768 	}
1769 
1770 	/* Recycle Rx descriptors from completion queue */
1771 	netcp_empty_rx_queue(netcp);
1772 
1773 	/* Recycle Tx descriptors from completion queue */
1774 	netcp_process_tx_compl_packets(netcp, netcp->tx_pool_size);
1775 
1776 	if (knav_pool_count(netcp->tx_pool) != netcp->tx_pool_size)
1777 		dev_err(netcp->ndev_dev, "Lost (%d) Tx descs\n",
1778 			netcp->tx_pool_size - knav_pool_count(netcp->tx_pool));
1779 
1780 	netcp_free_navigator_resources(netcp);
1781 	dev_dbg(netcp->ndev_dev, "netcp device %s stopped\n", ndev->name);
1782 	return 0;
1783 }
1784 
1785 static int netcp_ndo_ioctl(struct net_device *ndev,
1786 			   struct ifreq *req, int cmd)
1787 {
1788 	struct netcp_intf *netcp = netdev_priv(ndev);
1789 	struct netcp_intf_modpriv *intf_modpriv;
1790 	struct netcp_module *module;
1791 	int ret = -1, err = -EOPNOTSUPP;
1792 
1793 	if (!netif_running(ndev))
1794 		return -EINVAL;
1795 
1796 	for_each_module(netcp, intf_modpriv) {
1797 		module = intf_modpriv->netcp_module;
1798 		if (!module->ioctl)
1799 			continue;
1800 
1801 		err = module->ioctl(intf_modpriv->module_priv, req, cmd);
1802 		if ((err < 0) && (err != -EOPNOTSUPP)) {
1803 			ret = err;
1804 			goto out;
1805 		}
1806 		if (err == 0)
1807 			ret = err;
1808 	}
1809 
1810 out:
1811 	return (ret == 0) ? 0 : err;
1812 }
1813 
1814 static void netcp_ndo_tx_timeout(struct net_device *ndev, unsigned int txqueue)
1815 {
1816 	struct netcp_intf *netcp = netdev_priv(ndev);
1817 	unsigned int descs = knav_pool_count(netcp->tx_pool);
1818 
1819 	dev_err(netcp->ndev_dev, "transmit timed out tx descs(%d)\n", descs);
1820 	netcp_process_tx_compl_packets(netcp, netcp->tx_pool_size);
1821 	netif_trans_update(ndev);
1822 	netif_tx_wake_all_queues(ndev);
1823 }
1824 
1825 static int netcp_rx_add_vid(struct net_device *ndev, __be16 proto, u16 vid)
1826 {
1827 	struct netcp_intf *netcp = netdev_priv(ndev);
1828 	struct netcp_intf_modpriv *intf_modpriv;
1829 	struct netcp_module *module;
1830 	unsigned long flags;
1831 	int err = 0;
1832 
1833 	dev_dbg(netcp->ndev_dev, "adding rx vlan id: %d\n", vid);
1834 
1835 	spin_lock_irqsave(&netcp->lock, flags);
1836 	for_each_module(netcp, intf_modpriv) {
1837 		module = intf_modpriv->netcp_module;
1838 		if ((module->add_vid) && (vid != 0)) {
1839 			err = module->add_vid(intf_modpriv->module_priv, vid);
1840 			if (err != 0) {
1841 				dev_err(netcp->ndev_dev, "Could not add vlan id = %d\n",
1842 					vid);
1843 				break;
1844 			}
1845 		}
1846 	}
1847 	spin_unlock_irqrestore(&netcp->lock, flags);
1848 
1849 	return err;
1850 }
1851 
1852 static int netcp_rx_kill_vid(struct net_device *ndev, __be16 proto, u16 vid)
1853 {
1854 	struct netcp_intf *netcp = netdev_priv(ndev);
1855 	struct netcp_intf_modpriv *intf_modpriv;
1856 	struct netcp_module *module;
1857 	unsigned long flags;
1858 	int err = 0;
1859 
1860 	dev_dbg(netcp->ndev_dev, "removing rx vlan id: %d\n", vid);
1861 
1862 	spin_lock_irqsave(&netcp->lock, flags);
1863 	for_each_module(netcp, intf_modpriv) {
1864 		module = intf_modpriv->netcp_module;
1865 		if (module->del_vid) {
1866 			err = module->del_vid(intf_modpriv->module_priv, vid);
1867 			if (err != 0) {
1868 				dev_err(netcp->ndev_dev, "Could not delete vlan id = %d\n",
1869 					vid);
1870 				break;
1871 			}
1872 		}
1873 	}
1874 	spin_unlock_irqrestore(&netcp->lock, flags);
1875 	return err;
1876 }
1877 
1878 static int netcp_setup_tc(struct net_device *dev, enum tc_setup_type type,
1879 			  void *type_data)
1880 {
1881 	struct tc_mqprio_qopt *mqprio = type_data;
1882 	u8 num_tc;
1883 	int i;
1884 
1885 	/* setup tc must be called under rtnl lock */
1886 	ASSERT_RTNL();
1887 
1888 	if (type != TC_SETUP_QDISC_MQPRIO)
1889 		return -EOPNOTSUPP;
1890 
1891 	mqprio->hw = TC_MQPRIO_HW_OFFLOAD_TCS;
1892 	num_tc = mqprio->num_tc;
1893 
1894 	/* Sanity-check the number of traffic classes requested */
1895 	if ((dev->real_num_tx_queues <= 1) ||
1896 	    (dev->real_num_tx_queues < num_tc))
1897 		return -EINVAL;
1898 
1899 	/* Configure traffic class to queue mappings */
1900 	if (num_tc) {
1901 		netdev_set_num_tc(dev, num_tc);
1902 		for (i = 0; i < num_tc; i++)
1903 			netdev_set_tc_queue(dev, i, 1, i);
1904 	} else {
1905 		netdev_reset_tc(dev);
1906 	}
1907 
1908 	return 0;
1909 }
1910 
1911 static void
1912 netcp_get_stats(struct net_device *ndev, struct rtnl_link_stats64 *stats)
1913 {
1914 	struct netcp_intf *netcp = netdev_priv(ndev);
1915 	struct netcp_stats *p = &netcp->stats;
1916 	u64 rxpackets, rxbytes, txpackets, txbytes;
1917 	unsigned int start;
1918 
1919 	do {
1920 		start = u64_stats_fetch_begin_irq(&p->syncp_rx);
1921 		rxpackets       = p->rx_packets;
1922 		rxbytes         = p->rx_bytes;
1923 	} while (u64_stats_fetch_retry_irq(&p->syncp_rx, start));
1924 
1925 	do {
1926 		start = u64_stats_fetch_begin_irq(&p->syncp_tx);
1927 		txpackets       = p->tx_packets;
1928 		txbytes         = p->tx_bytes;
1929 	} while (u64_stats_fetch_retry_irq(&p->syncp_tx, start));
1930 
1931 	stats->rx_packets = rxpackets;
1932 	stats->rx_bytes = rxbytes;
1933 	stats->tx_packets = txpackets;
1934 	stats->tx_bytes = txbytes;
1935 
1936 	/* The following are stored as 32 bit */
1937 	stats->rx_errors = p->rx_errors;
1938 	stats->rx_dropped = p->rx_dropped;
1939 	stats->tx_dropped = p->tx_dropped;
1940 }
1941 
1942 static const struct net_device_ops netcp_netdev_ops = {
1943 	.ndo_open		= netcp_ndo_open,
1944 	.ndo_stop		= netcp_ndo_stop,
1945 	.ndo_start_xmit		= netcp_ndo_start_xmit,
1946 	.ndo_set_rx_mode	= netcp_set_rx_mode,
1947 	.ndo_eth_ioctl           = netcp_ndo_ioctl,
1948 	.ndo_get_stats64        = netcp_get_stats,
1949 	.ndo_set_mac_address	= eth_mac_addr,
1950 	.ndo_validate_addr	= eth_validate_addr,
1951 	.ndo_vlan_rx_add_vid	= netcp_rx_add_vid,
1952 	.ndo_vlan_rx_kill_vid	= netcp_rx_kill_vid,
1953 	.ndo_tx_timeout		= netcp_ndo_tx_timeout,
1954 	.ndo_select_queue	= dev_pick_tx_zero,
1955 	.ndo_setup_tc		= netcp_setup_tc,
1956 };
1957 
1958 static int netcp_create_interface(struct netcp_device *netcp_device,
1959 				  struct device_node *node_interface)
1960 {
1961 	struct device *dev = netcp_device->device;
1962 	struct device_node *node = dev->of_node;
1963 	struct netcp_intf *netcp;
1964 	struct net_device *ndev;
1965 	resource_size_t size;
1966 	struct resource res;
1967 	void __iomem *efuse = NULL;
1968 	u32 efuse_mac = 0;
1969 	u8 efuse_mac_addr[6];
1970 	u32 temp[2];
1971 	int ret = 0;
1972 
1973 	ndev = alloc_etherdev_mqs(sizeof(*netcp), 1, 1);
1974 	if (!ndev) {
1975 		dev_err(dev, "Error allocating netdev\n");
1976 		return -ENOMEM;
1977 	}
1978 
1979 	ndev->features |= NETIF_F_SG;
1980 	ndev->features |= NETIF_F_HW_VLAN_CTAG_FILTER;
1981 	ndev->hw_features = ndev->features;
1982 	ndev->vlan_features |=  NETIF_F_SG;
1983 
1984 	/* MTU range: 68 - 9486 */
1985 	ndev->min_mtu = ETH_MIN_MTU;
1986 	ndev->max_mtu = NETCP_MAX_FRAME_SIZE - (ETH_HLEN + ETH_FCS_LEN);
1987 
1988 	netcp = netdev_priv(ndev);
1989 	spin_lock_init(&netcp->lock);
1990 	INIT_LIST_HEAD(&netcp->module_head);
1991 	INIT_LIST_HEAD(&netcp->txhook_list_head);
1992 	INIT_LIST_HEAD(&netcp->rxhook_list_head);
1993 	INIT_LIST_HEAD(&netcp->addr_list);
1994 	u64_stats_init(&netcp->stats.syncp_rx);
1995 	u64_stats_init(&netcp->stats.syncp_tx);
1996 	netcp->netcp_device = netcp_device;
1997 	netcp->dev = netcp_device->device;
1998 	netcp->ndev = ndev;
1999 	netcp->ndev_dev  = &ndev->dev;
2000 	netcp->msg_enable = netif_msg_init(netcp_debug_level, NETCP_DEBUG);
2001 	netcp->tx_pause_threshold = MAX_SKB_FRAGS;
2002 	netcp->tx_resume_threshold = netcp->tx_pause_threshold;
2003 	netcp->node_interface = node_interface;
2004 
2005 	ret = of_property_read_u32(node_interface, "efuse-mac", &efuse_mac);
2006 	if (efuse_mac) {
2007 		if (of_address_to_resource(node, NETCP_EFUSE_REG_INDEX, &res)) {
2008 			dev_err(dev, "could not find efuse-mac reg resource\n");
2009 			ret = -ENODEV;
2010 			goto quit;
2011 		}
2012 		size = resource_size(&res);
2013 
2014 		if (!devm_request_mem_region(dev, res.start, size,
2015 					     dev_name(dev))) {
2016 			dev_err(dev, "could not reserve resource\n");
2017 			ret = -ENOMEM;
2018 			goto quit;
2019 		}
2020 
2021 		efuse = devm_ioremap(dev, res.start, size);
2022 		if (!efuse) {
2023 			dev_err(dev, "could not map resource\n");
2024 			devm_release_mem_region(dev, res.start, size);
2025 			ret = -ENOMEM;
2026 			goto quit;
2027 		}
2028 
2029 		emac_arch_get_mac_addr(efuse_mac_addr, efuse, efuse_mac);
2030 		if (is_valid_ether_addr(efuse_mac_addr))
2031 			eth_hw_addr_set(ndev, efuse_mac_addr);
2032 		else
2033 			eth_hw_addr_random(ndev);
2034 
2035 		devm_iounmap(dev, efuse);
2036 		devm_release_mem_region(dev, res.start, size);
2037 	} else {
2038 		ret = of_get_ethdev_address(node_interface, ndev);
2039 		if (ret)
2040 			eth_hw_addr_random(ndev);
2041 	}
2042 
2043 	ret = of_property_read_string(node_interface, "rx-channel",
2044 				      &netcp->dma_chan_name);
2045 	if (ret < 0) {
2046 		dev_err(dev, "missing \"rx-channel\" parameter\n");
2047 		ret = -ENODEV;
2048 		goto quit;
2049 	}
2050 
2051 	ret = of_property_read_u32(node_interface, "rx-queue",
2052 				   &netcp->rx_queue_id);
2053 	if (ret < 0) {
2054 		dev_warn(dev, "missing \"rx-queue\" parameter\n");
2055 		netcp->rx_queue_id = KNAV_QUEUE_QPEND;
2056 	}
2057 
2058 	ret = of_property_read_u32_array(node_interface, "rx-queue-depth",
2059 					 netcp->rx_queue_depths,
2060 					 KNAV_DMA_FDQ_PER_CHAN);
2061 	if (ret < 0) {
2062 		dev_err(dev, "missing \"rx-queue-depth\" parameter\n");
2063 		netcp->rx_queue_depths[0] = 128;
2064 	}
2065 
2066 	ret = of_property_read_u32_array(node_interface, "rx-pool", temp, 2);
2067 	if (ret < 0) {
2068 		dev_err(dev, "missing \"rx-pool\" parameter\n");
2069 		ret = -ENODEV;
2070 		goto quit;
2071 	}
2072 	netcp->rx_pool_size = temp[0];
2073 	netcp->rx_pool_region_id = temp[1];
2074 
2075 	ret = of_property_read_u32_array(node_interface, "tx-pool", temp, 2);
2076 	if (ret < 0) {
2077 		dev_err(dev, "missing \"tx-pool\" parameter\n");
2078 		ret = -ENODEV;
2079 		goto quit;
2080 	}
2081 	netcp->tx_pool_size = temp[0];
2082 	netcp->tx_pool_region_id = temp[1];
2083 
2084 	if (netcp->tx_pool_size < MAX_SKB_FRAGS) {
2085 		dev_err(dev, "tx-pool size too small, must be atleast(%ld)\n",
2086 			MAX_SKB_FRAGS);
2087 		ret = -ENODEV;
2088 		goto quit;
2089 	}
2090 
2091 	ret = of_property_read_u32(node_interface, "tx-completion-queue",
2092 				   &netcp->tx_compl_qid);
2093 	if (ret < 0) {
2094 		dev_warn(dev, "missing \"tx-completion-queue\" parameter\n");
2095 		netcp->tx_compl_qid = KNAV_QUEUE_QPEND;
2096 	}
2097 
2098 	/* NAPI register */
2099 	netif_napi_add(ndev, &netcp->rx_napi, netcp_rx_poll, NETCP_NAPI_WEIGHT);
2100 	netif_tx_napi_add(ndev, &netcp->tx_napi, netcp_tx_poll, NETCP_NAPI_WEIGHT);
2101 
2102 	/* Register the network device */
2103 	ndev->dev_id		= 0;
2104 	ndev->watchdog_timeo	= NETCP_TX_TIMEOUT;
2105 	ndev->netdev_ops	= &netcp_netdev_ops;
2106 	SET_NETDEV_DEV(ndev, dev);
2107 
2108 	list_add_tail(&netcp->interface_list, &netcp_device->interface_head);
2109 	return 0;
2110 
2111 quit:
2112 	free_netdev(ndev);
2113 	return ret;
2114 }
2115 
2116 static void netcp_delete_interface(struct netcp_device *netcp_device,
2117 				   struct net_device *ndev)
2118 {
2119 	struct netcp_intf_modpriv *intf_modpriv, *tmp;
2120 	struct netcp_intf *netcp = netdev_priv(ndev);
2121 	struct netcp_module *module;
2122 
2123 	dev_dbg(netcp_device->device, "Removing interface \"%s\"\n",
2124 		ndev->name);
2125 
2126 	/* Notify each of the modules that the interface is going away */
2127 	list_for_each_entry_safe(intf_modpriv, tmp, &netcp->module_head,
2128 				 intf_list) {
2129 		module = intf_modpriv->netcp_module;
2130 		dev_dbg(netcp_device->device, "Releasing module \"%s\"\n",
2131 			module->name);
2132 		if (module->release)
2133 			module->release(intf_modpriv->module_priv);
2134 		list_del(&intf_modpriv->intf_list);
2135 	}
2136 	WARN(!list_empty(&netcp->module_head), "%s interface module list is not empty!\n",
2137 	     ndev->name);
2138 
2139 	list_del(&netcp->interface_list);
2140 
2141 	of_node_put(netcp->node_interface);
2142 	unregister_netdev(ndev);
2143 	free_netdev(ndev);
2144 }
2145 
2146 static int netcp_probe(struct platform_device *pdev)
2147 {
2148 	struct device_node *node = pdev->dev.of_node;
2149 	struct netcp_intf *netcp_intf, *netcp_tmp;
2150 	struct device_node *child, *interfaces;
2151 	struct netcp_device *netcp_device;
2152 	struct device *dev = &pdev->dev;
2153 	struct netcp_module *module;
2154 	int ret;
2155 
2156 	if (!knav_dma_device_ready() ||
2157 	    !knav_qmss_device_ready())
2158 		return -EPROBE_DEFER;
2159 
2160 	if (!node) {
2161 		dev_err(dev, "could not find device info\n");
2162 		return -ENODEV;
2163 	}
2164 
2165 	/* Allocate a new NETCP device instance */
2166 	netcp_device = devm_kzalloc(dev, sizeof(*netcp_device), GFP_KERNEL);
2167 	if (!netcp_device)
2168 		return -ENOMEM;
2169 
2170 	pm_runtime_enable(&pdev->dev);
2171 	ret = pm_runtime_get_sync(&pdev->dev);
2172 	if (ret < 0) {
2173 		dev_err(dev, "Failed to enable NETCP power-domain\n");
2174 		pm_runtime_disable(&pdev->dev);
2175 		return ret;
2176 	}
2177 
2178 	/* Initialize the NETCP device instance */
2179 	INIT_LIST_HEAD(&netcp_device->interface_head);
2180 	INIT_LIST_HEAD(&netcp_device->modpriv_head);
2181 	netcp_device->device = dev;
2182 	platform_set_drvdata(pdev, netcp_device);
2183 
2184 	/* create interfaces */
2185 	interfaces = of_get_child_by_name(node, "netcp-interfaces");
2186 	if (!interfaces) {
2187 		dev_err(dev, "could not find netcp-interfaces node\n");
2188 		ret = -ENODEV;
2189 		goto probe_quit;
2190 	}
2191 
2192 	for_each_available_child_of_node(interfaces, child) {
2193 		ret = netcp_create_interface(netcp_device, child);
2194 		if (ret) {
2195 			dev_err(dev, "could not create interface(%pOFn)\n",
2196 				child);
2197 			goto probe_quit_interface;
2198 		}
2199 	}
2200 
2201 	of_node_put(interfaces);
2202 
2203 	/* Add the device instance to the list */
2204 	list_add_tail(&netcp_device->device_list, &netcp_devices);
2205 
2206 	/* Probe & attach any modules already registered */
2207 	mutex_lock(&netcp_modules_lock);
2208 	for_each_netcp_module(module) {
2209 		ret = netcp_module_probe(netcp_device, module);
2210 		if (ret < 0)
2211 			dev_err(dev, "module(%s) probe failed\n", module->name);
2212 	}
2213 	mutex_unlock(&netcp_modules_lock);
2214 	return 0;
2215 
2216 probe_quit_interface:
2217 	list_for_each_entry_safe(netcp_intf, netcp_tmp,
2218 				 &netcp_device->interface_head,
2219 				 interface_list) {
2220 		netcp_delete_interface(netcp_device, netcp_intf->ndev);
2221 	}
2222 
2223 	of_node_put(interfaces);
2224 
2225 probe_quit:
2226 	pm_runtime_put_sync(&pdev->dev);
2227 	pm_runtime_disable(&pdev->dev);
2228 	platform_set_drvdata(pdev, NULL);
2229 	return ret;
2230 }
2231 
2232 static int netcp_remove(struct platform_device *pdev)
2233 {
2234 	struct netcp_device *netcp_device = platform_get_drvdata(pdev);
2235 	struct netcp_intf *netcp_intf, *netcp_tmp;
2236 	struct netcp_inst_modpriv *inst_modpriv, *tmp;
2237 	struct netcp_module *module;
2238 
2239 	list_for_each_entry_safe(inst_modpriv, tmp, &netcp_device->modpriv_head,
2240 				 inst_list) {
2241 		module = inst_modpriv->netcp_module;
2242 		dev_dbg(&pdev->dev, "Removing module \"%s\"\n", module->name);
2243 		module->remove(netcp_device, inst_modpriv->module_priv);
2244 		list_del(&inst_modpriv->inst_list);
2245 	}
2246 
2247 	/* now that all modules are removed, clean up the interfaces */
2248 	list_for_each_entry_safe(netcp_intf, netcp_tmp,
2249 				 &netcp_device->interface_head,
2250 				 interface_list) {
2251 		netcp_delete_interface(netcp_device, netcp_intf->ndev);
2252 	}
2253 
2254 	WARN(!list_empty(&netcp_device->interface_head),
2255 	     "%s interface list not empty!\n", pdev->name);
2256 
2257 	pm_runtime_put_sync(&pdev->dev);
2258 	pm_runtime_disable(&pdev->dev);
2259 	platform_set_drvdata(pdev, NULL);
2260 	return 0;
2261 }
2262 
2263 static const struct of_device_id of_match[] = {
2264 	{ .compatible = "ti,netcp-1.0", },
2265 	{},
2266 };
2267 MODULE_DEVICE_TABLE(of, of_match);
2268 
2269 static struct platform_driver netcp_driver = {
2270 	.driver = {
2271 		.name		= "netcp-1.0",
2272 		.of_match_table	= of_match,
2273 	},
2274 	.probe = netcp_probe,
2275 	.remove = netcp_remove,
2276 };
2277 module_platform_driver(netcp_driver);
2278 
2279 MODULE_LICENSE("GPL v2");
2280 MODULE_DESCRIPTION("TI NETCP driver for Keystone SOCs");
2281 MODULE_AUTHOR("Sandeep Nair <sandeep_n@ti.com");
2282