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_TX_TIMEOUT (5 * HZ)
28	#define NETCP_PACKET_SIZE (ETH_FRAME_LEN + ETH_FCS_LEN)
29	#define NETCP_MIN_PACKET_SIZE ETH_ZLEN
30	#define NETCP_MAX_MCAST_ADDR 16
31
32	#define NETCP_EFUSE_REG_INDEX 0
33
34	#define NETCP_MOD_PROBE_SKIPPED 1
35	#define NETCP_MOD_PROBE_FAILED 2
36
37	#define NETCP_DEBUG (NETIF_MSG_HW | NETIF_MSG_WOL | \
38	NETIF_MSG_DRV | NETIF_MSG_LINK | \
39	NETIF_MSG_IFUP | NETIF_MSG_INTR | \
40	NETIF_MSG_PROBE | NETIF_MSG_TIMER | \
41	NETIF_MSG_IFDOWN | NETIF_MSG_RX_ERR | \
42	NETIF_MSG_TX_ERR | NETIF_MSG_TX_DONE | \
43	NETIF_MSG_PKTDATA | NETIF_MSG_TX_QUEUED | \
44	NETIF_MSG_RX_STATUS)
45
46	#define NETCP_EFUSE_ADDR_SWAP 2
47
48	#define knav_queue_get_id(q) knav_queue_device_control(q, \
49	KNAV_QUEUE_GET_ID, (unsigned long)NULL)
50
51	#define knav_queue_enable_notify(q) knav_queue_device_control(q, \
52	KNAV_QUEUE_ENABLE_NOTIFY, \
53	(unsigned long)NULL)
54
55	#define knav_queue_disable_notify(q) knav_queue_device_control(q, \
56	KNAV_QUEUE_DISABLE_NOTIFY, \
57	(unsigned long)NULL)
58
59	#define knav_queue_get_count(q) knav_queue_device_control(q, \
60	KNAV_QUEUE_GET_COUNT, (unsigned long)NULL)
61
62	#define for_each_netcp_module(module) \
63	list_for_each_entry(module, &netcp_modules, module_list)
64
65	#define for_each_netcp_device_module(netcp_device, inst_modpriv) \
66	list_for_each_entry(inst_modpriv, \
67	&((netcp_device)->modpriv_head), inst_list)
68
69	#define for_each_module(netcp, intf_modpriv) \
70	list_for_each_entry(intf_modpriv, &netcp->module_head, intf_list)
71
72	/* Module management structures */
73	struct netcp_device {
74	struct list_head device_list;
75	struct list_head interface_head;
76	struct list_head modpriv_head;
77	struct device *device;
78	};
79
80	struct netcp_inst_modpriv {
81	struct netcp_device *netcp_device;
82	struct netcp_module *netcp_module;
83	struct list_head inst_list;
84	void *module_priv;
85	};
86
87	struct netcp_intf_modpriv {
88	struct netcp_intf *netcp_priv;
89	struct netcp_module *netcp_module;
90	struct list_head intf_list;
91	void *module_priv;
92	};
93
94	struct netcp_tx_cb {
95	void *ts_context;
96	void (*txtstamp)(void *context, struct sk_buff *skb);
97	};
98
99	static LIST_HEAD(netcp_devices);
100	static LIST_HEAD(netcp_modules);
101	static DEFINE_MUTEX(netcp_modules_lock);
102
103	static int netcp_debug_level = -1;
104	module_param(netcp_debug_level, int, 0);
105	MODULE_PARM_DESC(netcp_debug_level, "Netcp debug level (NETIF_MSG bits) (0=none,...,16=all)");
106
107	/* Helper functions - Get/Set */
108	static void get_pkt_info(dma_addr_t *buff, u32 *buff_len, dma_addr_t *ndesc,
109	struct knav_dma_desc *desc)
110	{
111	*buff_len = le32_to_cpu(desc->buff_len);
112	*buff = le32_to_cpu(desc->buff);
113	*ndesc = le32_to_cpu(desc->next_desc);
114	}
115
116	static void get_desc_info(u32 *desc_info, u32 *pkt_info,
117	struct knav_dma_desc *desc)
118	{
119	*desc_info = le32_to_cpu(desc->desc_info);
120	*pkt_info = le32_to_cpu(desc->packet_info);
121	}
122
123	static u32 get_sw_data(int index, struct knav_dma_desc *desc)
124	{
125	/* No Endian conversion needed as this data is untouched by hw */
126	return desc->sw_data[index];
127	}
128
129	/* use these macros to get sw data */
130	#define GET_SW_DATA0(desc) get_sw_data(0, desc)
131	#define GET_SW_DATA1(desc) get_sw_data(1, desc)
132	#define GET_SW_DATA2(desc) get_sw_data(2, desc)
133	#define GET_SW_DATA3(desc) get_sw_data(3, desc)
134
135	static void get_org_pkt_info(dma_addr_t *buff, u32 *buff_len,
136	struct knav_dma_desc *desc)
137	{
138	*buff = le32_to_cpu(desc->orig_buff);
139	*buff_len = le32_to_cpu(desc->orig_len);
140	}
141
142	static void get_words(dma_addr_t *words, int num_words, __le32 *desc)
143	{
144	int i;
145
146	for (i = 0; i < num_words; i++)
147	words[i] = le32_to_cpu(desc[i]);
148	}
149
150	static void set_pkt_info(dma_addr_t buff, u32 buff_len, u32 ndesc,
151	struct knav_dma_desc *desc)
152	{
153	desc->buff_len = cpu_to_le32(buff_len);
154	desc->buff = cpu_to_le32(buff);
155	desc->next_desc = cpu_to_le32(ndesc);
156	}
157
158	static void set_desc_info(u32 desc_info, u32 pkt_info,
159	struct knav_dma_desc *desc)
160	{
161	desc->desc_info = cpu_to_le32(desc_info);
162	desc->packet_info = cpu_to_le32(pkt_info);
163	}
164
165	static void set_sw_data(int index, u32 data, struct knav_dma_desc *desc)
166	{
167	/* No Endian conversion needed as this data is untouched by hw */
168	desc->sw_data[index] = data;
169	}
170
171	/* use these macros to set sw data */
172	#define SET_SW_DATA0(data, desc) set_sw_data(0, data, desc)
173	#define SET_SW_DATA1(data, desc) set_sw_data(1, data, desc)
174	#define SET_SW_DATA2(data, desc) set_sw_data(2, data, desc)
175	#define SET_SW_DATA3(data, desc) set_sw_data(3, data, desc)
176
177	static void set_org_pkt_info(dma_addr_t buff, u32 buff_len,
178	struct knav_dma_desc *desc)
179	{
180	desc->orig_buff = cpu_to_le32(buff);
181	desc->orig_len = cpu_to_le32(buff_len);
182	}
183
184	static void set_words(u32 *words, int num_words, __le32 *desc)
185	{
186	int i;
187
188	for (i = 0; i < num_words; i++)
189	desc[i] = cpu_to_le32(words[i]);
190	}
191
192	/* Read the e-fuse value as 32 bit values to be endian independent */
193	static int emac_arch_get_mac_addr(char *x, void __iomem *efuse_mac, u32 swap)
194	{
195	unsigned int addr0, addr1;
196
197	addr1 = readl(addr: efuse_mac + 4);
198	addr0 = readl(addr: efuse_mac);
199
200	switch (swap) {
201	case NETCP_EFUSE_ADDR_SWAP:
202	addr0 = addr1;
203	addr1 = readl(addr: efuse_mac);
204	break;
205	default:
206	break;
207	}
208
209	x[0] = (addr1 & 0x0000ff00) >> 8;
210	x[1] = addr1 & 0x000000ff;
211	x[2] = (addr0 & 0xff000000) >> 24;
212	x[3] = (addr0 & 0x00ff0000) >> 16;
213	x[4] = (addr0 & 0x0000ff00) >> 8;
214	x[5] = addr0 & 0x000000ff;
215
216	return 0;
217	}
218
219	/* Module management routines */
220	static int netcp_register_interface(struct netcp_intf *netcp)
221	{
222	int ret;
223
224	ret = register_netdev(dev: netcp->ndev);
225	if (!ret)
226	netcp->netdev_registered = true;
227	return ret;
228	}
229
230	static int netcp_module_probe(struct netcp_device *netcp_device,
231	struct netcp_module *module)
232	{
233	struct device *dev = netcp_device->device;
234	struct device_node *devices, *interface, *node = dev->of_node;
235	struct device_node *child;
236	struct netcp_inst_modpriv *inst_modpriv;
237	struct netcp_intf *netcp_intf;
238	struct netcp_module *tmp;
239	bool primary_module_registered = false;
240	int ret;
241
242	/* Find this module in the sub-tree for this device */
243	devices = of_get_child_by_name(node, name: "netcp-devices");
244	if (!devices) {
245	dev_err(dev, "could not find netcp-devices node\n");
246	return NETCP_MOD_PROBE_SKIPPED;
247	}
248
249	for_each_available_child_of_node(devices, child) {
250	const char *name;
251	char node_name[32];
252
253	if (of_property_read_string(np: child, propname: "label", out_string: &name) < 0) {
254	snprintf(buf: node_name, size: sizeof(node_name), fmt: "%pOFn", child);
255	name = node_name;
256	}
257	if (!strcasecmp(s1: module->name, s2: name))
258	break;
259	}
260
261	of_node_put(node: devices);
262	/* If module not used for this device, skip it */
263	if (!child) {
264	dev_warn(dev, "module(%s) not used for device\n", module->name);
265	return NETCP_MOD_PROBE_SKIPPED;
266	}
267
268	inst_modpriv = devm_kzalloc(dev, size: sizeof(*inst_modpriv), GFP_KERNEL);
269	if (!inst_modpriv) {
270	of_node_put(node: child);
271	return -ENOMEM;
272	}
273
274	inst_modpriv->netcp_device = netcp_device;
275	inst_modpriv->netcp_module = module;
276	list_add_tail(new: &inst_modpriv->inst_list, head: &netcp_device->modpriv_head);
277
278	ret = module->probe(netcp_device, dev, child,
279	&inst_modpriv->module_priv);
280	of_node_put(node: child);
281	if (ret) {
282	dev_err(dev, "Probe of module(%s) failed with %d\n",
283	module->name, ret);
284	list_del(entry: &inst_modpriv->inst_list);
285	devm_kfree(dev, p: inst_modpriv);
286	return NETCP_MOD_PROBE_FAILED;
287	}
288
289	/* Attach modules only if the primary module is probed */
290	for_each_netcp_module(tmp) {
291	if (tmp->primary)
292	primary_module_registered = true;
293	}
294
295	if (!primary_module_registered)
296	return 0;
297
298	/* Attach module to interfaces */
299	list_for_each_entry(netcp_intf, &netcp_device->interface_head,
300	interface_list) {
301	struct netcp_intf_modpriv *intf_modpriv;
302
303	intf_modpriv = devm_kzalloc(dev, size: sizeof(*intf_modpriv),
304	GFP_KERNEL);
305	if (!intf_modpriv)
306	return -ENOMEM;
307
308	interface = of_parse_phandle(np: netcp_intf->node_interface,
309	phandle_name: module->name, index: 0);
310
311	if (!interface) {
312	devm_kfree(dev, p: intf_modpriv);
313	continue;
314	}
315
316	intf_modpriv->netcp_priv = netcp_intf;
317	intf_modpriv->netcp_module = module;
318	list_add_tail(new: &intf_modpriv->intf_list,
319	head: &netcp_intf->module_head);
320
321	ret = module->attach(inst_modpriv->module_priv,
322	netcp_intf->ndev, interface,
323	&intf_modpriv->module_priv);
324	of_node_put(node: interface);
325	if (ret) {
326	dev_dbg(dev, "Attach of module %s declined with %d\n",
327	module->name, ret);
328	list_del(entry: &intf_modpriv->intf_list);
329	devm_kfree(dev, p: intf_modpriv);
330	continue;
331	}
332	}
333
334	/* Now register the interface with netdev */
335	list_for_each_entry(netcp_intf,
336	&netcp_device->interface_head,
337	interface_list) {
338	/* If interface not registered then register now */
339	if (!netcp_intf->netdev_registered) {
340	ret = netcp_register_interface(netcp: netcp_intf);
341	if (ret)
342	return -ENODEV;
343	}
344	}
345	return 0;
346	}
347
348	int netcp_register_module(struct netcp_module *module)
349	{
350	struct netcp_device *netcp_device;
351	struct netcp_module *tmp;
352	int ret;
353
354	if (!module->name) {
355	WARN(1, "error registering netcp module: no name\n");
356	return -EINVAL;
357	}
358
359	if (!module->probe) {
360	WARN(1, "error registering netcp module: no probe\n");
361	return -EINVAL;
362	}
363
364	mutex_lock(&netcp_modules_lock);
365
366	for_each_netcp_module(tmp) {
367	if (!strcasecmp(s1: tmp->name, s2: module->name)) {
368	mutex_unlock(lock: &netcp_modules_lock);
369	return -EEXIST;
370	}
371	}
372	list_add_tail(new: &module->module_list, head: &netcp_modules);
373
374	list_for_each_entry(netcp_device, &netcp_devices, device_list) {
375	ret = netcp_module_probe(netcp_device, module);
376	if (ret < 0)
377	goto fail;
378	}
379	mutex_unlock(lock: &netcp_modules_lock);
380	return 0;
381
382	fail:
383	mutex_unlock(lock: &netcp_modules_lock);
384	netcp_unregister_module(module);
385	return ret;
386	}
387	EXPORT_SYMBOL_GPL(netcp_register_module);
388
389	static void netcp_release_module(struct netcp_device *netcp_device,
390	struct netcp_module *module)
391	{
392	struct netcp_inst_modpriv *inst_modpriv, *inst_tmp;
393	struct netcp_intf *netcp_intf, *netcp_tmp;
394	struct device *dev = netcp_device->device;
395
396	/* Release the module from each interface */
397	list_for_each_entry_safe(netcp_intf, netcp_tmp,
398	&netcp_device->interface_head,
399	interface_list) {
400	struct netcp_intf_modpriv *intf_modpriv, *intf_tmp;
401
402	list_for_each_entry_safe(intf_modpriv, intf_tmp,
403	&netcp_intf->module_head,
404	intf_list) {
405	if (intf_modpriv->netcp_module == module) {
406	module->release(intf_modpriv->module_priv);
407	list_del(entry: &intf_modpriv->intf_list);
408	devm_kfree(dev, p: intf_modpriv);
409	break;
410	}
411	}
412	}
413
414	/* Remove the module from each instance */
415	list_for_each_entry_safe(inst_modpriv, inst_tmp,
416	&netcp_device->modpriv_head, inst_list) {
417	if (inst_modpriv->netcp_module == module) {
418	module->remove(netcp_device,
419	inst_modpriv->module_priv);
420	list_del(entry: &inst_modpriv->inst_list);
421	devm_kfree(dev, p: inst_modpriv);
422	break;
423	}
424	}
425	}
426
427	void netcp_unregister_module(struct netcp_module *module)
428	{
429	struct netcp_device *netcp_device;
430	struct netcp_module *module_tmp;
431
432	mutex_lock(&netcp_modules_lock);
433
434	list_for_each_entry(netcp_device, &netcp_devices, device_list) {
435	netcp_release_module(netcp_device, module);
436	}
437
438	/* Remove the module from the module list */
439	for_each_netcp_module(module_tmp) {
440	if (module == module_tmp) {
441	list_del(entry: &module->module_list);
442	break;
443	}
444	}
445
446	mutex_unlock(lock: &netcp_modules_lock);
447	}
448	EXPORT_SYMBOL_GPL(netcp_unregister_module);
449
450	void *netcp_module_get_intf_data(struct netcp_module *module,
451	struct netcp_intf *intf)
452	{
453	struct netcp_intf_modpriv *intf_modpriv;
454
455	list_for_each_entry(intf_modpriv, &intf->module_head, intf_list)
456	if (intf_modpriv->netcp_module == module)
457	return intf_modpriv->module_priv;
458	return NULL;
459	}
460	EXPORT_SYMBOL_GPL(netcp_module_get_intf_data);
461
462	/* Module TX and RX Hook management */
463	struct netcp_hook_list {
464	struct list_head list;
465	netcp_hook_rtn *hook_rtn;
466	void *hook_data;
467	int order;
468	};
469
470	int netcp_register_txhook(struct netcp_intf *netcp_priv, int order,
471	netcp_hook_rtn *hook_rtn, void *hook_data)
472	{
473	struct netcp_hook_list *entry;
474	struct netcp_hook_list *next;
475	unsigned long flags;
476
477	entry = devm_kzalloc(dev: netcp_priv->dev, size: sizeof(*entry), GFP_KERNEL);
478	if (!entry)
479	return -ENOMEM;
480
481	entry->hook_rtn = hook_rtn;
482	entry->hook_data = hook_data;
483	entry->order = order;
484
485	spin_lock_irqsave(&netcp_priv->lock, flags);
486	list_for_each_entry(next, &netcp_priv->txhook_list_head, list) {
487	if (next->order > order)
488	break;
489	}
490	__list_add(new: &entry->list, prev: next->list.prev, next: &next->list);
491	spin_unlock_irqrestore(lock: &netcp_priv->lock, flags);
492
493	return 0;
494	}
495	EXPORT_SYMBOL_GPL(netcp_register_txhook);
496
497	int netcp_unregister_txhook(struct netcp_intf *netcp_priv, int order,
498	netcp_hook_rtn *hook_rtn, void *hook_data)
499	{
500	struct netcp_hook_list *next, *n;
501	unsigned long flags;
502
503	spin_lock_irqsave(&netcp_priv->lock, flags);
504	list_for_each_entry_safe(next, n, &netcp_priv->txhook_list_head, list) {
505	if ((next->order == order) &&
506	(next->hook_rtn == hook_rtn) &&
507	(next->hook_data == hook_data)) {
508	list_del(entry: &next->list);
509	spin_unlock_irqrestore(lock: &netcp_priv->lock, flags);
510	devm_kfree(dev: netcp_priv->dev, p: next);
511	return 0;
512	}
513	}
514	spin_unlock_irqrestore(lock: &netcp_priv->lock, flags);
515	return -ENOENT;
516	}
517	EXPORT_SYMBOL_GPL(netcp_unregister_txhook);
518
519	int netcp_register_rxhook(struct netcp_intf *netcp_priv, int order,
520	netcp_hook_rtn *hook_rtn, void *hook_data)
521	{
522	struct netcp_hook_list *entry;
523	struct netcp_hook_list *next;
524	unsigned long flags;
525
526	entry = devm_kzalloc(dev: netcp_priv->dev, size: sizeof(*entry), GFP_KERNEL);
527	if (!entry)
528	return -ENOMEM;
529
530	entry->hook_rtn = hook_rtn;
531	entry->hook_data = hook_data;
532	entry->order = order;
533
534	spin_lock_irqsave(&netcp_priv->lock, flags);
535	list_for_each_entry(next, &netcp_priv->rxhook_list_head, list) {
536	if (next->order > order)
537	break;
538	}
539	__list_add(new: &entry->list, prev: next->list.prev, next: &next->list);
540	spin_unlock_irqrestore(lock: &netcp_priv->lock, flags);
541
542	return 0;
543	}
544	EXPORT_SYMBOL_GPL(netcp_register_rxhook);
545
546	int netcp_unregister_rxhook(struct netcp_intf *netcp_priv, int order,
547	netcp_hook_rtn *hook_rtn, void *hook_data)
548	{
549	struct netcp_hook_list *next, *n;
550	unsigned long flags;
551
552	spin_lock_irqsave(&netcp_priv->lock, flags);
553	list_for_each_entry_safe(next, n, &netcp_priv->rxhook_list_head, list) {
554	if ((next->order == order) &&
555	(next->hook_rtn == hook_rtn) &&
556	(next->hook_data == hook_data)) {
557	list_del(entry: &next->list);
558	spin_unlock_irqrestore(lock: &netcp_priv->lock, flags);
559	devm_kfree(dev: netcp_priv->dev, p: next);
560	return 0;
561	}
562	}
563	spin_unlock_irqrestore(lock: &netcp_priv->lock, flags);
564
565	return -ENOENT;
566	}
567	EXPORT_SYMBOL_GPL(netcp_unregister_rxhook);
568
569	static void netcp_frag_free(bool is_frag, void *ptr)
570	{
571	if (is_frag)
572	skb_free_frag(addr: ptr);
573	else
574	kfree(objp: ptr);
575	}
576
577	static void netcp_free_rx_desc_chain(struct netcp_intf *netcp,
578	struct knav_dma_desc *desc)
579	{
580	struct knav_dma_desc *ndesc;
581	dma_addr_t dma_desc, dma_buf;
582	unsigned int buf_len, dma_sz = sizeof(*ndesc);
583	void *buf_ptr;
584	u32 tmp;
585
586	get_words(words: &dma_desc, num_words: 1, desc: &desc->next_desc);
587
588	while (dma_desc) {
589	ndesc = knav_pool_desc_unmap(ph: netcp->rx_pool, dma: dma_desc, dma_sz);
590	if (unlikely(!ndesc)) {
591	dev_err(netcp->ndev_dev, "failed to unmap Rx desc\n");
592	break;
593	}
594	get_pkt_info(buff: &dma_buf, buff_len: &tmp, ndesc: &dma_desc, desc: ndesc);
595	/* warning!!!! We are retrieving the virtual ptr in the sw_data
596	* field as a 32bit value. Will not work on 64bit machines
597	*/
598	buf_ptr = (void *)GET_SW_DATA0(ndesc);
599	buf_len = (int)GET_SW_DATA1(desc);
600	dma_unmap_page(netcp->dev, dma_buf, PAGE_SIZE, DMA_FROM_DEVICE);
601	__free_page(buf_ptr);
602	knav_pool_desc_put(ph: netcp->rx_pool, desc);
603	}
604	/* warning!!!! We are retrieving the virtual ptr in the sw_data
605	* field as a 32bit value. Will not work on 64bit machines
606	*/
607	buf_ptr = (void *)GET_SW_DATA0(desc);
608	buf_len = (int)GET_SW_DATA1(desc);
609
610	if (buf_ptr)
611	netcp_frag_free(is_frag: buf_len <= PAGE_SIZE, ptr: buf_ptr);
612	knav_pool_desc_put(ph: netcp->rx_pool, desc);
613	}
614
615	static void netcp_empty_rx_queue(struct netcp_intf *netcp)
616	{
617	struct netcp_stats *rx_stats = &netcp->stats;
618	struct knav_dma_desc *desc;
619	unsigned int dma_sz;
620	dma_addr_t dma;
621
622	for (; ;) {
623	dma = knav_queue_pop(qhandle: netcp->rx_queue, size: &dma_sz);
624	if (!dma)
625	break;
626
627	desc = knav_pool_desc_unmap(ph: netcp->rx_pool, dma, dma_sz);
628	if (unlikely(!desc)) {
629	dev_err(netcp->ndev_dev, "%s: failed to unmap Rx desc\n",
630	__func__);
631	rx_stats->rx_errors++;
632	continue;
633	}
634	netcp_free_rx_desc_chain(netcp, desc);
635	rx_stats->rx_dropped++;
636	}
637	}
638
639	static int netcp_process_one_rx_packet(struct netcp_intf *netcp)
640	{
641	struct netcp_stats *rx_stats = &netcp->stats;
642	unsigned int dma_sz, buf_len, org_buf_len;
643	struct knav_dma_desc *desc, *ndesc;
644	unsigned int pkt_sz = 0, accum_sz;
645	struct netcp_hook_list *rx_hook;
646	dma_addr_t dma_desc, dma_buff;
647	struct netcp_packet p_info;
648	struct sk_buff *skb;
649	void *org_buf_ptr;
650	u32 tmp;
651
652	dma_desc = knav_queue_pop(qhandle: netcp->rx_queue, size: &dma_sz);
653	if (!dma_desc)
654	return -1;
655
656	desc = knav_pool_desc_unmap(ph: netcp->rx_pool, dma: dma_desc, dma_sz);
657	if (unlikely(!desc)) {
658	dev_err(netcp->ndev_dev, "failed to unmap Rx desc\n");
659	return 0;
660	}
661
662	get_pkt_info(buff: &dma_buff, buff_len: &buf_len, ndesc: &dma_desc, desc);
663	/* warning!!!! We are retrieving the virtual ptr in the sw_data
664	* field as a 32bit value. Will not work on 64bit machines
665	*/
666	org_buf_ptr = (void *)GET_SW_DATA0(desc);
667	org_buf_len = (int)GET_SW_DATA1(desc);
668
669	if (unlikely(!org_buf_ptr)) {
670	dev_err(netcp->ndev_dev, "NULL bufptr in desc\n");
671	goto free_desc;
672	}
673
674	pkt_sz &= KNAV_DMA_DESC_PKT_LEN_MASK;
675	accum_sz = buf_len;
676	dma_unmap_single(netcp->dev, dma_buff, buf_len, DMA_FROM_DEVICE);
677
678	/* Build a new sk_buff for the primary buffer */
679	skb = build_skb(data: org_buf_ptr, frag_size: org_buf_len);
680	if (unlikely(!skb)) {
681	dev_err(netcp->ndev_dev, "build_skb() failed\n");
682	goto free_desc;
683	}
684
685	/* update data, tail and len */
686	skb_reserve(skb, NETCP_SOP_OFFSET);
687	__skb_put(skb, len: buf_len);
688
689	/* Fill in the page fragment list */
690	while (dma_desc) {
691	struct page *page;
692
693	ndesc = knav_pool_desc_unmap(ph: netcp->rx_pool, dma: dma_desc, dma_sz);
694	if (unlikely(!ndesc)) {
695	dev_err(netcp->ndev_dev, "failed to unmap Rx desc\n");
696	goto free_desc;
697	}
698
699	get_pkt_info(buff: &dma_buff, buff_len: &buf_len, ndesc: &dma_desc, desc: ndesc);
700	/* warning!!!! We are retrieving the virtual ptr in the sw_data
701	* field as a 32bit value. Will not work on 64bit machines
702	*/
703	page = (struct page *)GET_SW_DATA0(ndesc);
704
705	if (likely(dma_buff && buf_len && page)) {
706	dma_unmap_page(netcp->dev, dma_buff, PAGE_SIZE,
707	DMA_FROM_DEVICE);
708	} else {
709	dev_err(netcp->ndev_dev, "Bad Rx desc dma_buff(%pad), len(%d), page(%p)\n",
710	&dma_buff, buf_len, page);
711	goto free_desc;
712	}
713
714	skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, page,
715	offset_in_page(dma_buff), size: buf_len, PAGE_SIZE);
716	accum_sz += buf_len;
717
718	/* Free the descriptor */
719	knav_pool_desc_put(ph: netcp->rx_pool, desc: ndesc);
720	}
721
722	/* check for packet len and warn */
723	if (unlikely(pkt_sz != accum_sz))
724	dev_dbg(netcp->ndev_dev, "mismatch in packet size(%d) & sum of fragments(%d)\n",
725	pkt_sz, accum_sz);
726
727	/* Newer version of the Ethernet switch can trim the Ethernet FCS
728	* from the packet and is indicated in hw_cap. So trim it only for
729	* older h/w
730	*/
731	if (!(netcp->hw_cap & ETH_SW_CAN_REMOVE_ETH_FCS))
732	__pskb_trim(skb, len: skb->len - ETH_FCS_LEN);
733
734	/* Call each of the RX hooks */
735	p_info.skb = skb;
736	skb->dev = netcp->ndev;
737	p_info.rxtstamp_complete = false;
738	get_desc_info(desc_info: &tmp, pkt_info: &p_info.eflags, desc);
739	p_info.epib = desc->epib;
740	p_info.psdata = (u32 __force *)desc->psdata;
741	p_info.eflags = ((p_info.eflags >> KNAV_DMA_DESC_EFLAGS_SHIFT) &
742	KNAV_DMA_DESC_EFLAGS_MASK);
743	list_for_each_entry(rx_hook, &netcp->rxhook_list_head, list) {
744	int ret;
745
746	ret = rx_hook->hook_rtn(rx_hook->order, rx_hook->hook_data,
747	&p_info);
748	if (unlikely(ret)) {
749	dev_err(netcp->ndev_dev, "RX hook %d failed: %d\n",
750	rx_hook->order, ret);
751	/* Free the primary descriptor */
752	rx_stats->rx_dropped++;
753	knav_pool_desc_put(ph: netcp->rx_pool, desc);
754	dev_kfree_skb(skb);
755	return 0;
756	}
757	}
758	/* Free the primary descriptor */
759	knav_pool_desc_put(ph: netcp->rx_pool, desc);
760
761	u64_stats_update_begin(syncp: &rx_stats->syncp_rx);
762	rx_stats->rx_packets++;
763	rx_stats->rx_bytes += skb->len;
764	u64_stats_update_end(syncp: &rx_stats->syncp_rx);
765
766	/* push skb up the stack */
767	skb->protocol = eth_type_trans(skb, dev: netcp->ndev);
768	netif_receive_skb(skb);
769	return 0;
770
771	free_desc:
772	netcp_free_rx_desc_chain(netcp, desc);
773	rx_stats->rx_errors++;
774	return 0;
775	}
776
777	static int netcp_process_rx_packets(struct netcp_intf *netcp,
778	unsigned int budget)
779	{
780	int i;
781
782	for (i = 0; (i < budget) && !netcp_process_one_rx_packet(netcp); i++)
783	;
784	return i;
785	}
786
787	/* Release descriptors and attached buffers from Rx FDQ */
788	static void netcp_free_rx_buf(struct netcp_intf *netcp, int fdq)
789	{
790	struct knav_dma_desc *desc;
791	unsigned int buf_len, dma_sz;
792	dma_addr_t dma;
793	void *buf_ptr;
794
795	/* Allocate descriptor */
796	while ((dma = knav_queue_pop(qhandle: netcp->rx_fdq[fdq], size: &dma_sz))) {
797	desc = knav_pool_desc_unmap(ph: netcp->rx_pool, dma, dma_sz);
798	if (unlikely(!desc)) {
799	dev_err(netcp->ndev_dev, "failed to unmap Rx desc\n");
800	continue;
801	}
802
803	get_org_pkt_info(buff: &dma, buff_len: &buf_len, desc);
804	/* warning!!!! We are retrieving the virtual ptr in the sw_data
805	* field as a 32bit value. Will not work on 64bit machines
806	*/
807	buf_ptr = (void *)GET_SW_DATA0(desc);
808
809	if (unlikely(!dma)) {
810	dev_err(netcp->ndev_dev, "NULL orig_buff in desc\n");
811	knav_pool_desc_put(ph: netcp->rx_pool, desc);
812	continue;
813	}
814
815	if (unlikely(!buf_ptr)) {
816	dev_err(netcp->ndev_dev, "NULL bufptr in desc\n");
817	knav_pool_desc_put(ph: netcp->rx_pool, desc);
818	continue;
819	}
820
821	if (fdq == 0) {
822	dma_unmap_single(netcp->dev, dma, buf_len,
823	DMA_FROM_DEVICE);
824	netcp_frag_free(is_frag: (buf_len <= PAGE_SIZE), ptr: buf_ptr);
825	} else {
826	dma_unmap_page(netcp->dev, dma, buf_len,
827	DMA_FROM_DEVICE);
828	__free_page(buf_ptr);
829	}
830
831	knav_pool_desc_put(ph: netcp->rx_pool, desc);
832	}
833	}
834
835	static void netcp_rxpool_free(struct netcp_intf *netcp)
836	{
837	int i;
838
839	for (i = 0; i < KNAV_DMA_FDQ_PER_CHAN &&
840	!IS_ERR_OR_NULL(ptr: netcp->rx_fdq[i]); i++)
841	netcp_free_rx_buf(netcp, fdq: i);
842
843	if (knav_pool_count(ph: netcp->rx_pool) != netcp->rx_pool_size)
844	dev_err(netcp->ndev_dev, "Lost Rx (%d) descriptors\n",
845	netcp->rx_pool_size - knav_pool_count(netcp->rx_pool));
846
847	knav_pool_destroy(ph: netcp->rx_pool);
848	netcp->rx_pool = NULL;
849	}
850
851	static int netcp_allocate_rx_buf(struct netcp_intf *netcp, int fdq)
852	{
853	struct knav_dma_desc *hwdesc;
854	unsigned int buf_len, dma_sz;
855	u32 desc_info, pkt_info;
856	struct page *page;
857	dma_addr_t dma;
858	void *bufptr;
859	u32 sw_data[2];
860
861	/* Allocate descriptor */
862	hwdesc = knav_pool_desc_get(ph: netcp->rx_pool);
863	if (IS_ERR_OR_NULL(ptr: hwdesc)) {
864	dev_dbg(netcp->ndev_dev, "out of rx pool desc\n");
865	return -ENOMEM;
866	}
867
868	if (likely(fdq == 0)) {
869	unsigned int primary_buf_len;
870	/* Allocate a primary receive queue entry */
871	buf_len = NETCP_PACKET_SIZE + NETCP_SOP_OFFSET;
872	primary_buf_len = SKB_DATA_ALIGN(buf_len) +
873	SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
874
875	bufptr = netdev_alloc_frag(fragsz: primary_buf_len);
876	sw_data[1] = primary_buf_len;
877
878	if (unlikely(!bufptr)) {
879	dev_warn_ratelimited(netcp->ndev_dev,
880	"Primary RX buffer alloc failed\n");
881	goto fail;
882	}
883	dma = dma_map_single(netcp->dev, bufptr, buf_len,
884	DMA_TO_DEVICE);
885	if (unlikely(dma_mapping_error(netcp->dev, dma)))
886	goto fail;
887
888	/* warning!!!! We are saving the virtual ptr in the sw_data
889	* field as a 32bit value. Will not work on 64bit machines
890	*/
891	sw_data[0] = (u32)bufptr;
892	} else {
893	/* Allocate a secondary receive queue entry */
894	page = alloc_page(GFP_ATOMIC | GFP_DMA);
895	if (unlikely(!page)) {
896	dev_warn_ratelimited(netcp->ndev_dev, "Secondary page alloc failed\n");
897	goto fail;
898	}
899	buf_len = PAGE_SIZE;
900	dma = dma_map_page(netcp->dev, page, 0, buf_len, DMA_TO_DEVICE);
901	/* warning!!!! We are saving the virtual ptr in the sw_data
902	* field as a 32bit value. Will not work on 64bit machines
903	*/
904	sw_data[0] = (u32)page;
905	sw_data[1] = 0;
906	}
907
908	desc_info = KNAV_DMA_DESC_PS_INFO_IN_DESC;
909	desc_info |= buf_len & KNAV_DMA_DESC_PKT_LEN_MASK;
910	pkt_info = KNAV_DMA_DESC_HAS_EPIB;
911	pkt_info |= KNAV_DMA_NUM_PS_WORDS << KNAV_DMA_DESC_PSLEN_SHIFT;
912	pkt_info |= (netcp->rx_queue_id & KNAV_DMA_DESC_RETQ_MASK) <<
913	KNAV_DMA_DESC_RETQ_SHIFT;
914	set_org_pkt_info(buff: dma, buff_len: buf_len, desc: hwdesc);
915	SET_SW_DATA0(sw_data[0], hwdesc);
916	SET_SW_DATA1(sw_data[1], hwdesc);
917	set_desc_info(desc_info, pkt_info, desc: hwdesc);
918
919	/* Push to FDQs */
920	knav_pool_desc_map(ph: netcp->rx_pool, desc: hwdesc, size: sizeof(*hwdesc), dma: &dma,
921	dma_sz: &dma_sz);
922	knav_queue_push(qhandle: netcp->rx_fdq[fdq], dma, size: sizeof(*hwdesc), flags: 0);
923	return 0;
924
925	fail:
926	knav_pool_desc_put(ph: netcp->rx_pool, desc: hwdesc);
927	return -ENOMEM;
928	}
929
930	/* Refill Rx FDQ with descriptors & attached buffers */
931	static void netcp_rxpool_refill(struct netcp_intf *netcp)
932	{
933	u32 fdq_deficit[KNAV_DMA_FDQ_PER_CHAN] = {0};
934	int i, ret = 0;
935
936	/* Calculate the FDQ deficit and refill */
937	for (i = 0; i < KNAV_DMA_FDQ_PER_CHAN && netcp->rx_fdq[i]; i++) {
938	fdq_deficit[i] = netcp->rx_queue_depths[i] -
939	knav_queue_get_count(netcp->rx_fdq[i]);
940
941	while (fdq_deficit[i]-- && !ret)
942	ret = netcp_allocate_rx_buf(netcp, fdq: i);
943	} /* end for fdqs */
944	}
945
946	/* NAPI poll */
947	static int netcp_rx_poll(struct napi_struct *napi, int budget)
948	{
949	struct netcp_intf *netcp = container_of(napi, struct netcp_intf,
950	rx_napi);
951	unsigned int packets;
952
953	packets = netcp_process_rx_packets(netcp, budget);
954
955	netcp_rxpool_refill(netcp);
956	if (packets < budget) {
957	napi_complete_done(n: &netcp->rx_napi, work_done: packets);
958	knav_queue_enable_notify(netcp->rx_queue);
959	}
960
961	return packets;
962	}
963
964	static void netcp_rx_notify(void *arg)
965	{
966	struct netcp_intf *netcp = arg;
967
968	knav_queue_disable_notify(netcp->rx_queue);
969	napi_schedule(n: &netcp->rx_napi);
970	}
971
972	static void netcp_free_tx_desc_chain(struct netcp_intf *netcp,
973	struct knav_dma_desc *desc,
974	unsigned int desc_sz)
975	{
976	struct knav_dma_desc *ndesc = desc;
977	dma_addr_t dma_desc, dma_buf;
978	unsigned int buf_len;
979
980	while (ndesc) {
981	get_pkt_info(buff: &dma_buf, buff_len: &buf_len, ndesc: &dma_desc, desc: ndesc);
982
983	if (dma_buf && buf_len)
984	dma_unmap_single(netcp->dev, dma_buf, buf_len,
985	DMA_TO_DEVICE);
986	else
987	dev_warn(netcp->ndev_dev, "bad Tx desc buf(%pad), len(%d)\n",
988	&dma_buf, buf_len);
989
990	knav_pool_desc_put(ph: netcp->tx_pool, desc: ndesc);
991	ndesc = NULL;
992	if (dma_desc) {
993	ndesc = knav_pool_desc_unmap(ph: netcp->tx_pool, dma: dma_desc,
994	dma_sz: desc_sz);
995	if (!ndesc)
996	dev_err(netcp->ndev_dev, "failed to unmap Tx desc\n");
997	}
998	}
999	}
1000
1001	static int netcp_process_tx_compl_packets(struct netcp_intf *netcp,
1002	unsigned int budget)
1003	{
1004	struct netcp_stats *tx_stats = &netcp->stats;
1005	struct knav_dma_desc *desc;
1006	struct netcp_tx_cb *tx_cb;
1007	struct sk_buff *skb;
1008	unsigned int dma_sz;
1009	dma_addr_t dma;
1010	int pkts = 0;
1011
1012	while (budget--) {
1013	dma = knav_queue_pop(qhandle: netcp->tx_compl_q, size: &dma_sz);
1014	if (!dma)
1015	break;
1016	desc = knav_pool_desc_unmap(ph: netcp->tx_pool, dma, dma_sz);
1017	if (unlikely(!desc)) {
1018	dev_err(netcp->ndev_dev, "failed to unmap Tx desc\n");
1019	tx_stats->tx_errors++;
1020	continue;
1021	}
1022
1023	/* warning!!!! We are retrieving the virtual ptr in the sw_data
1024	* field as a 32bit value. Will not work on 64bit machines
1025	*/
1026	skb = (struct sk_buff *)GET_SW_DATA0(desc);
1027	netcp_free_tx_desc_chain(netcp, desc, desc_sz: dma_sz);
1028	if (!skb) {
1029	dev_err(netcp->ndev_dev, "No skb in Tx desc\n");
1030	tx_stats->tx_errors++;
1031	continue;
1032	}
1033
1034	tx_cb = (struct netcp_tx_cb *)skb->cb;
1035	if (tx_cb->txtstamp)
1036	tx_cb->txtstamp(tx_cb->ts_context, skb);
1037
1038	if (netif_subqueue_stopped(dev: netcp->ndev, skb) &&
1039	netif_running(dev: netcp->ndev) &&
1040	(knav_pool_count(ph: netcp->tx_pool) >
1041	netcp->tx_resume_threshold)) {
1042	u16 subqueue = skb_get_queue_mapping(skb);
1043
1044	netif_wake_subqueue(dev: netcp->ndev, queue_index: subqueue);
1045	}
1046
1047	u64_stats_update_begin(syncp: &tx_stats->syncp_tx);
1048	tx_stats->tx_packets++;
1049	tx_stats->tx_bytes += skb->len;
1050	u64_stats_update_end(syncp: &tx_stats->syncp_tx);
1051	dev_kfree_skb(skb);
1052	pkts++;
1053	}
1054	return pkts;
1055	}
1056
1057	static int netcp_tx_poll(struct napi_struct *napi, int budget)
1058	{
1059	int packets;
1060	struct netcp_intf *netcp = container_of(napi, struct netcp_intf,
1061	tx_napi);
1062
1063	packets = netcp_process_tx_compl_packets(netcp, budget);
1064	if (packets < budget) {
1065	napi_complete(n: &netcp->tx_napi);
1066	knav_queue_enable_notify(netcp->tx_compl_q);
1067	}
1068
1069	return packets;
1070	}
1071
1072	static void netcp_tx_notify(void *arg)
1073	{
1074	struct netcp_intf *netcp = arg;
1075
1076	knav_queue_disable_notify(netcp->tx_compl_q);
1077	napi_schedule(n: &netcp->tx_napi);
1078	}
1079
1080	static struct knav_dma_desc*
1081	netcp_tx_map_skb(struct sk_buff *skb, struct netcp_intf *netcp)
1082	{
1083	struct knav_dma_desc *desc, *ndesc, *pdesc;
1084	unsigned int pkt_len = skb_headlen(skb);
1085	struct device *dev = netcp->dev;
1086	dma_addr_t dma_addr;
1087	unsigned int dma_sz;
1088	int i;
1089
1090	/* Map the linear buffer */
1091	dma_addr = dma_map_single(dev, skb->data, pkt_len, DMA_TO_DEVICE);
1092	if (unlikely(dma_mapping_error(dev, dma_addr))) {
1093	dev_err(netcp->ndev_dev, "Failed to map skb buffer\n");
1094	return NULL;
1095	}
1096
1097	desc = knav_pool_desc_get(ph: netcp->tx_pool);
1098	if (IS_ERR_OR_NULL(ptr: desc)) {
1099	dev_err(netcp->ndev_dev, "out of TX desc\n");
1100	dma_unmap_single(dev, dma_addr, pkt_len, DMA_TO_DEVICE);
1101	return NULL;
1102	}
1103
1104	set_pkt_info(buff: dma_addr, buff_len: pkt_len, ndesc: 0, desc);
1105	if (skb_is_nonlinear(skb)) {
1106	prefetchw(skb_shinfo(skb));
1107	} else {
1108	desc->next_desc = 0;
1109	goto upd_pkt_len;
1110	}
1111
1112	pdesc = desc;
1113
1114	/* Handle the case where skb is fragmented in pages */
1115	for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1116	skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1117	struct page *page = skb_frag_page(frag);
1118	u32 page_offset = skb_frag_off(frag);
1119	u32 buf_len = skb_frag_size(frag);
1120	dma_addr_t desc_dma;
1121	u32 desc_dma_32;
1122
1123	dma_addr = dma_map_page(dev, page, page_offset, buf_len,
1124	DMA_TO_DEVICE);
1125	if (unlikely(!dma_addr)) {
1126	dev_err(netcp->ndev_dev, "Failed to map skb page\n");
1127	goto free_descs;
1128	}
1129
1130	ndesc = knav_pool_desc_get(ph: netcp->tx_pool);
1131	if (IS_ERR_OR_NULL(ptr: ndesc)) {
1132	dev_err(netcp->ndev_dev, "out of TX desc for frags\n");
1133	dma_unmap_page(dev, dma_addr, buf_len, DMA_TO_DEVICE);
1134	goto free_descs;
1135	}
1136
1137	desc_dma = knav_pool_desc_virt_to_dma(ph: netcp->tx_pool, virt: ndesc);
1138	set_pkt_info(buff: dma_addr, buff_len: buf_len, ndesc: 0, desc: ndesc);
1139	desc_dma_32 = (u32)desc_dma;
1140	set_words(words: &desc_dma_32, num_words: 1, desc: &pdesc->next_desc);
1141	pkt_len += buf_len;
1142	if (pdesc != desc)
1143	knav_pool_desc_map(ph: netcp->tx_pool, desc: pdesc,
1144	size: sizeof(*pdesc), dma: &desc_dma, dma_sz: &dma_sz);
1145	pdesc = ndesc;
1146	}
1147	if (pdesc != desc)
1148	knav_pool_desc_map(ph: netcp->tx_pool, desc: pdesc, size: sizeof(*pdesc),
1149	dma: &dma_addr, dma_sz: &dma_sz);
1150
1151	/* frag list based linkage is not supported for now. */
1152	if (skb_shinfo(skb)->frag_list) {
1153	dev_err_ratelimited(netcp->ndev_dev, "NETIF_F_FRAGLIST not supported\n");
1154	goto free_descs;
1155	}
1156
1157	upd_pkt_len:
1158	WARN_ON(pkt_len != skb->len);
1159
1160	pkt_len &= KNAV_DMA_DESC_PKT_LEN_MASK;
1161	set_words(words: &pkt_len, num_words: 1, desc: &desc->desc_info);
1162	return desc;
1163
1164	free_descs:
1165	netcp_free_tx_desc_chain(netcp, desc, desc_sz: sizeof(*desc));
1166	return NULL;
1167	}
1168
1169	static int netcp_tx_submit_skb(struct netcp_intf *netcp,
1170	struct sk_buff *skb,
1171	struct knav_dma_desc *desc)
1172	{
1173	struct netcp_tx_pipe *tx_pipe = NULL;
1174	struct netcp_hook_list *tx_hook;
1175	struct netcp_packet p_info;
1176	struct netcp_tx_cb *tx_cb;
1177	unsigned int dma_sz;
1178	dma_addr_t dma;
1179	u32 tmp = 0;
1180	int ret = 0;
1181
1182	p_info.netcp = netcp;
1183	p_info.skb = skb;
1184	p_info.tx_pipe = NULL;
1185	p_info.psdata_len = 0;
1186	p_info.ts_context = NULL;
1187	p_info.txtstamp = NULL;
1188	p_info.epib = desc->epib;
1189	p_info.psdata = (u32 __force *)desc->psdata;
1190	memset(p_info.epib, 0, KNAV_DMA_NUM_EPIB_WORDS * sizeof(__le32));
1191
1192	/* Find out where to inject the packet for transmission */
1193	list_for_each_entry(tx_hook, &netcp->txhook_list_head, list) {
1194	ret = tx_hook->hook_rtn(tx_hook->order, tx_hook->hook_data,
1195	&p_info);
1196	if (unlikely(ret != 0)) {
1197	dev_err(netcp->ndev_dev, "TX hook %d rejected the packet with reason(%d)\n",
1198	tx_hook->order, ret);
1199	ret = (ret < 0) ? ret : NETDEV_TX_OK;
1200	goto out;
1201	}
1202	}
1203
1204	/* Make sure some TX hook claimed the packet */
1205	tx_pipe = p_info.tx_pipe;
1206	if (!tx_pipe) {
1207	dev_err(netcp->ndev_dev, "No TX hook claimed the packet!\n");
1208	ret = -ENXIO;
1209	goto out;
1210	}
1211
1212	tx_cb = (struct netcp_tx_cb *)skb->cb;
1213	tx_cb->ts_context = p_info.ts_context;
1214	tx_cb->txtstamp = p_info.txtstamp;
1215
1216	/* update descriptor */
1217	if (p_info.psdata_len) {
1218	/* psdata points to both native-endian and device-endian data */
1219	__le32 *psdata = (void __force *)p_info.psdata;
1220
1221	set_words(words: (u32 *)psdata +
1222	(KNAV_DMA_NUM_PS_WORDS - p_info.psdata_len),
1223	num_words: p_info.psdata_len, desc: psdata);
1224	tmp |= (p_info.psdata_len & KNAV_DMA_DESC_PSLEN_MASK) <<
1225	KNAV_DMA_DESC_PSLEN_SHIFT;
1226	}
1227
1228	tmp |= KNAV_DMA_DESC_HAS_EPIB |
1229	((netcp->tx_compl_qid & KNAV_DMA_DESC_RETQ_MASK) <<
1230	KNAV_DMA_DESC_RETQ_SHIFT);
1231
1232	if (!(tx_pipe->flags & SWITCH_TO_PORT_IN_TAGINFO)) {
1233	tmp |= ((tx_pipe->switch_to_port & KNAV_DMA_DESC_PSFLAG_MASK) <<
1234	KNAV_DMA_DESC_PSFLAG_SHIFT);
1235	}
1236
1237	set_words(words: &tmp, num_words: 1, desc: &desc->packet_info);
1238	/* warning!!!! We are saving the virtual ptr in the sw_data
1239	* field as a 32bit value. Will not work on 64bit machines
1240	*/
1241	SET_SW_DATA0((u32)skb, desc);
1242
1243	if (tx_pipe->flags & SWITCH_TO_PORT_IN_TAGINFO) {
1244	tmp = tx_pipe->switch_to_port;
1245	set_words(words: &tmp, num_words: 1, desc: &desc->tag_info);
1246	}
1247
1248	/* submit packet descriptor */
1249	ret = knav_pool_desc_map(ph: netcp->tx_pool, desc, size: sizeof(*desc), dma: &dma,
1250	dma_sz: &dma_sz);
1251	if (unlikely(ret)) {
1252	dev_err(netcp->ndev_dev, "%s() failed to map desc\n", __func__);
1253	ret = -ENOMEM;
1254	goto out;
1255	}
1256	skb_tx_timestamp(skb);
1257	knav_queue_push(qhandle: tx_pipe->dma_queue, dma, size: dma_sz, flags: 0);
1258
1259	out:
1260	return ret;
1261	}
1262
1263	/* Submit the packet */
1264	static netdev_tx_t netcp_ndo_start_xmit(struct sk_buff *skb, struct net_device *ndev)
1265	{
1266	struct netcp_intf *netcp = netdev_priv(dev: ndev);
1267	struct netcp_stats *tx_stats = &netcp->stats;
1268	int subqueue = skb_get_queue_mapping(skb);
1269	struct knav_dma_desc *desc;
1270	int desc_count, ret = 0;
1271
1272	if (unlikely(skb->len <= 0)) {
1273	dev_kfree_skb(skb);
1274	return NETDEV_TX_OK;
1275	}
1276
1277	if (unlikely(skb->len < NETCP_MIN_PACKET_SIZE)) {
1278	ret = skb_padto(skb, NETCP_MIN_PACKET_SIZE);
1279	if (ret < 0) {
1280	/* If we get here, the skb has already been dropped */
1281	dev_warn(netcp->ndev_dev, "padding failed (%d), packet dropped\n",
1282	ret);
1283	tx_stats->tx_dropped++;
1284	return ret;
1285	}
1286	skb->len = NETCP_MIN_PACKET_SIZE;
1287	}
1288
1289	desc = netcp_tx_map_skb(skb, netcp);
1290	if (unlikely(!desc)) {
1291	netif_stop_subqueue(dev: ndev, queue_index: subqueue);
1292	ret = -ENOBUFS;
1293	goto drop;
1294	}
1295
1296	ret = netcp_tx_submit_skb(netcp, skb, desc);
1297	if (ret)
1298	goto drop;
1299
1300	/* Check Tx pool count & stop subqueue if needed */
1301	desc_count = knav_pool_count(ph: netcp->tx_pool);
1302	if (desc_count < netcp->tx_pause_threshold) {
1303	dev_dbg(netcp->ndev_dev, "pausing tx, count(%d)\n", desc_count);
1304	netif_stop_subqueue(dev: ndev, queue_index: subqueue);
1305	}
1306	return NETDEV_TX_OK;
1307
1308	drop:
1309	tx_stats->tx_dropped++;
1310	if (desc)
1311	netcp_free_tx_desc_chain(netcp, desc, desc_sz: sizeof(*desc));
1312	dev_kfree_skb(skb);
1313	return ret;
1314	}
1315
1316	int netcp_txpipe_close(struct netcp_tx_pipe *tx_pipe)
1317	{
1318	if (tx_pipe->dma_channel) {
1319	knav_dma_close_channel(channel: tx_pipe->dma_channel);
1320	tx_pipe->dma_channel = NULL;
1321	}
1322	return 0;
1323	}
1324	EXPORT_SYMBOL_GPL(netcp_txpipe_close);
1325
1326	int netcp_txpipe_open(struct netcp_tx_pipe *tx_pipe)
1327	{
1328	struct device *dev = tx_pipe->netcp_device->device;
1329	struct knav_dma_cfg config;
1330	int ret = 0;
1331	u8 name[16];
1332
1333	memset(&config, 0, sizeof(config));
1334	config.direction = DMA_MEM_TO_DEV;
1335	config.u.tx.filt_einfo = false;
1336	config.u.tx.filt_pswords = false;
1337	config.u.tx.priority = DMA_PRIO_MED_L;
1338
1339	tx_pipe->dma_channel = knav_dma_open_channel(dev,
1340	name: tx_pipe->dma_chan_name, config: &config);
1341	if (IS_ERR(ptr: tx_pipe->dma_channel)) {
1342	dev_err(dev, "failed opening tx chan(%s)\n",
1343	tx_pipe->dma_chan_name);
1344	ret = PTR_ERR(ptr: tx_pipe->dma_channel);
1345	goto err;
1346	}
1347
1348	snprintf(buf: name, size: sizeof(name), fmt: "tx-pipe-%s", dev_name(dev));
1349	tx_pipe->dma_queue = knav_queue_open(name, id: tx_pipe->dma_queue_id,
1350	KNAV_QUEUE_SHARED);
1351	if (IS_ERR(ptr: tx_pipe->dma_queue)) {
1352	dev_err(dev, "Could not open DMA queue for channel \"%s\": %pe\n",
1353	name, tx_pipe->dma_queue);
1354	ret = PTR_ERR(ptr: tx_pipe->dma_queue);
1355	goto err;
1356	}
1357
1358	dev_dbg(dev, "opened tx pipe %s\n", name);
1359	return 0;
1360
1361	err:
1362	if (!IS_ERR_OR_NULL(ptr: tx_pipe->dma_channel))
1363	knav_dma_close_channel(channel: tx_pipe->dma_channel);
1364	tx_pipe->dma_channel = NULL;
1365	return ret;
1366	}
1367	EXPORT_SYMBOL_GPL(netcp_txpipe_open);
1368
1369	int netcp_txpipe_init(struct netcp_tx_pipe *tx_pipe,
1370	struct netcp_device *netcp_device,
1371	const char *dma_chan_name, unsigned int dma_queue_id)
1372	{
1373	memset(tx_pipe, 0, sizeof(*tx_pipe));
1374	tx_pipe->netcp_device = netcp_device;
1375	tx_pipe->dma_chan_name = dma_chan_name;
1376	tx_pipe->dma_queue_id = dma_queue_id;
1377	return 0;
1378	}
1379	EXPORT_SYMBOL_GPL(netcp_txpipe_init);
1380
1381	static struct netcp_addr *netcp_addr_find(struct netcp_intf *netcp,
1382	const u8 *addr,
1383	enum netcp_addr_type type)
1384	{
1385	struct netcp_addr *naddr;
1386
1387	list_for_each_entry(naddr, &netcp->addr_list, node) {
1388	if (naddr->type != type)
1389	continue;
1390	if (addr && memcmp(p: addr, q: naddr->addr, ETH_ALEN))
1391	continue;
1392	return naddr;
1393	}
1394
1395	return NULL;
1396	}
1397
1398	static struct netcp_addr *netcp_addr_add(struct netcp_intf *netcp,
1399	const u8 *addr,
1400	enum netcp_addr_type type)
1401	{
1402	struct netcp_addr *naddr;
1403
1404	naddr = devm_kmalloc(dev: netcp->dev, size: sizeof(*naddr), GFP_ATOMIC);
1405	if (!naddr)
1406	return NULL;
1407
1408	naddr->type = type;
1409	naddr->flags = 0;
1410	naddr->netcp = netcp;
1411	if (addr)
1412	ether_addr_copy(dst: naddr->addr, src: addr);
1413	else
1414	eth_zero_addr(addr: naddr->addr);
1415	list_add_tail(new: &naddr->node, head: &netcp->addr_list);
1416
1417	return naddr;
1418	}
1419
1420	static void netcp_addr_del(struct netcp_intf *netcp, struct netcp_addr *naddr)
1421	{
1422	list_del(entry: &naddr->node);
1423	devm_kfree(dev: netcp->dev, p: naddr);
1424	}
1425
1426	static void netcp_addr_clear_mark(struct netcp_intf *netcp)
1427	{
1428	struct netcp_addr *naddr;
1429
1430	list_for_each_entry(naddr, &netcp->addr_list, node)
1431	naddr->flags = 0;
1432	}
1433
1434	static void netcp_addr_add_mark(struct netcp_intf *netcp, const u8 *addr,
1435	enum netcp_addr_type type)
1436	{
1437	struct netcp_addr *naddr;
1438
1439	naddr = netcp_addr_find(netcp, addr, type);
1440	if (naddr) {
1441	naddr->flags |= ADDR_VALID;
1442	return;
1443	}
1444
1445	naddr = netcp_addr_add(netcp, addr, type);
1446	if (!WARN_ON(!naddr))
1447	naddr->flags |= ADDR_NEW;
1448	}
1449
1450	static void netcp_addr_sweep_del(struct netcp_intf *netcp)
1451	{
1452	struct netcp_addr *naddr, *tmp;
1453	struct netcp_intf_modpriv *priv;
1454	struct netcp_module *module;
1455	int error;
1456
1457	list_for_each_entry_safe(naddr, tmp, &netcp->addr_list, node) {
1458	if (naddr->flags & (ADDR_VALID | ADDR_NEW))
1459	continue;
1460	dev_dbg(netcp->ndev_dev, "deleting address %pM, type %x\n",
1461	naddr->addr, naddr->type);
1462	for_each_module(netcp, priv) {
1463	module = priv->netcp_module;
1464	if (!module->del_addr)
1465	continue;
1466	error = module->del_addr(priv->module_priv,
1467	naddr);
1468	WARN_ON(error);
1469	}
1470	netcp_addr_del(netcp, naddr);
1471	}
1472	}
1473
1474	static void netcp_addr_sweep_add(struct netcp_intf *netcp)
1475	{
1476	struct netcp_addr *naddr, *tmp;
1477	struct netcp_intf_modpriv *priv;
1478	struct netcp_module *module;
1479	int error;
1480
1481	list_for_each_entry_safe(naddr, tmp, &netcp->addr_list, node) {
1482	if (!(naddr->flags & ADDR_NEW))
1483	continue;
1484	dev_dbg(netcp->ndev_dev, "adding address %pM, type %x\n",
1485	naddr->addr, naddr->type);
1486
1487	for_each_module(netcp, priv) {
1488	module = priv->netcp_module;
1489	if (!module->add_addr)
1490	continue;
1491	error = module->add_addr(priv->module_priv, naddr);
1492	WARN_ON(error);
1493	}
1494	}
1495	}
1496
1497	static int netcp_set_promiscuous(struct netcp_intf *netcp, bool promisc)
1498	{
1499	struct netcp_intf_modpriv *priv;
1500	struct netcp_module *module;
1501	int error;
1502
1503	for_each_module(netcp, priv) {
1504	module = priv->netcp_module;
1505	if (!module->set_rx_mode)
1506	continue;
1507
1508	error = module->set_rx_mode(priv->module_priv, promisc);
1509	if (error)
1510	return error;
1511	}
1512	return 0;
1513	}
1514
1515	static void netcp_set_rx_mode(struct net_device *ndev)
1516	{
1517	struct netcp_intf *netcp = netdev_priv(dev: ndev);
1518	struct netdev_hw_addr *ndev_addr;
1519	bool promisc;
1520
1521	promisc = (ndev->flags & IFF_PROMISC ||
1522	ndev->flags & IFF_ALLMULTI ||
1523	netdev_mc_count(ndev) > NETCP_MAX_MCAST_ADDR);
1524
1525	spin_lock(lock: &netcp->lock);
1526	/* first clear all marks */
1527	netcp_addr_clear_mark(netcp);
1528
1529	/* next add new entries, mark existing ones */
1530	netcp_addr_add_mark(netcp, addr: ndev->broadcast, type: ADDR_BCAST);
1531	for_each_dev_addr(ndev, ndev_addr)
1532	netcp_addr_add_mark(netcp, addr: ndev_addr->addr, type: ADDR_DEV);
1533	netdev_for_each_uc_addr(ndev_addr, ndev)
1534	netcp_addr_add_mark(netcp, addr: ndev_addr->addr, type: ADDR_UCAST);
1535	netdev_for_each_mc_addr(ndev_addr, ndev)
1536	netcp_addr_add_mark(netcp, addr: ndev_addr->addr, type: ADDR_MCAST);
1537
1538	if (promisc)
1539	netcp_addr_add_mark(netcp, NULL, type: ADDR_ANY);
1540
1541	/* finally sweep and callout into modules */
1542	netcp_addr_sweep_del(netcp);
1543	netcp_addr_sweep_add(netcp);
1544	netcp_set_promiscuous(netcp, promisc);
1545	spin_unlock(lock: &netcp->lock);
1546	}
1547
1548	static void netcp_free_navigator_resources(struct netcp_intf *netcp)
1549	{
1550	int i;
1551
1552	if (netcp->rx_channel) {
1553	knav_dma_close_channel(channel: netcp->rx_channel);
1554	netcp->rx_channel = NULL;
1555	}
1556
1557	if (!IS_ERR_OR_NULL(ptr: netcp->rx_pool))
1558	netcp_rxpool_free(netcp);
1559
1560	if (!IS_ERR_OR_NULL(ptr: netcp->rx_queue)) {
1561	knav_queue_close(qhandle: netcp->rx_queue);
1562	netcp->rx_queue = NULL;
1563	}
1564
1565	for (i = 0; i < KNAV_DMA_FDQ_PER_CHAN &&
1566	!IS_ERR_OR_NULL(ptr: netcp->rx_fdq[i]) ; ++i) {
1567	knav_queue_close(qhandle: netcp->rx_fdq[i]);
1568	netcp->rx_fdq[i] = NULL;
1569	}
1570
1571	if (!IS_ERR_OR_NULL(ptr: netcp->tx_compl_q)) {
1572	knav_queue_close(qhandle: netcp->tx_compl_q);
1573	netcp->tx_compl_q = NULL;
1574	}
1575
1576	if (!IS_ERR_OR_NULL(ptr: netcp->tx_pool)) {
1577	knav_pool_destroy(ph: netcp->tx_pool);
1578	netcp->tx_pool = NULL;
1579	}
1580	}
1581
1582	static int netcp_setup_navigator_resources(struct net_device *ndev)
1583	{
1584	struct netcp_intf *netcp = netdev_priv(dev: ndev);
1585	struct knav_queue_notify_config notify_cfg;
1586	struct knav_dma_cfg config;
1587	u32 last_fdq = 0;
1588	u8 name[16];
1589	int ret;
1590	int i;
1591
1592	/* Create Rx/Tx descriptor pools */
1593	snprintf(buf: name, size: sizeof(name), fmt: "rx-pool-%s", ndev->name);
1594	netcp->rx_pool = knav_pool_create(name, num_desc: netcp->rx_pool_size,
1595	region_id: netcp->rx_pool_region_id);
1596	if (IS_ERR_OR_NULL(ptr: netcp->rx_pool)) {
1597	dev_err(netcp->ndev_dev, "Couldn't create rx pool\n");
1598	ret = PTR_ERR(ptr: netcp->rx_pool);
1599	goto fail;
1600	}
1601
1602	snprintf(buf: name, size: sizeof(name), fmt: "tx-pool-%s", ndev->name);
1603	netcp->tx_pool = knav_pool_create(name, num_desc: netcp->tx_pool_size,
1604	region_id: netcp->tx_pool_region_id);
1605	if (IS_ERR_OR_NULL(ptr: netcp->tx_pool)) {
1606	dev_err(netcp->ndev_dev, "Couldn't create tx pool\n");
1607	ret = PTR_ERR(ptr: netcp->tx_pool);
1608	goto fail;
1609	}
1610
1611	/* open Tx completion queue */
1612	snprintf(buf: name, size: sizeof(name), fmt: "tx-compl-%s", ndev->name);
1613	netcp->tx_compl_q = knav_queue_open(name, id: netcp->tx_compl_qid, flags: 0);
1614	if (IS_ERR(ptr: netcp->tx_compl_q)) {
1615	ret = PTR_ERR(ptr: netcp->tx_compl_q);
1616	goto fail;
1617	}
1618	netcp->tx_compl_qid = knav_queue_get_id(netcp->tx_compl_q);
1619
1620	/* Set notification for Tx completion */
1621	notify_cfg.fn = netcp_tx_notify;
1622	notify_cfg.fn_arg = netcp;
1623	ret = knav_queue_device_control(qhandle: netcp->tx_compl_q,
1624	cmd: KNAV_QUEUE_SET_NOTIFIER,
1625	arg: (unsigned long)&notify_cfg);
1626	if (ret)
1627	goto fail;
1628
1629	knav_queue_disable_notify(netcp->tx_compl_q);
1630
1631	/* open Rx completion queue */
1632	snprintf(buf: name, size: sizeof(name), fmt: "rx-compl-%s", ndev->name);
1633	netcp->rx_queue = knav_queue_open(name, id: netcp->rx_queue_id, flags: 0);
1634	if (IS_ERR(ptr: netcp->rx_queue)) {
1635	ret = PTR_ERR(ptr: netcp->rx_queue);
1636	goto fail;
1637	}
1638	netcp->rx_queue_id = knav_queue_get_id(netcp->rx_queue);
1639
1640	/* Set notification for Rx completion */
1641	notify_cfg.fn = netcp_rx_notify;
1642	notify_cfg.fn_arg = netcp;
1643	ret = knav_queue_device_control(qhandle: netcp->rx_queue,
1644	cmd: KNAV_QUEUE_SET_NOTIFIER,
1645	arg: (unsigned long)&notify_cfg);
1646	if (ret)
1647	goto fail;
1648
1649	knav_queue_disable_notify(netcp->rx_queue);
1650
1651	/* open Rx FDQs */
1652	for (i = 0; i < KNAV_DMA_FDQ_PER_CHAN && netcp->rx_queue_depths[i];
1653	++i) {
1654	snprintf(buf: name, size: sizeof(name), fmt: "rx-fdq-%s-%d", ndev->name, i);
1655	netcp->rx_fdq[i] = knav_queue_open(name, KNAV_QUEUE_GP, flags: 0);
1656	if (IS_ERR(ptr: netcp->rx_fdq[i])) {
1657	ret = PTR_ERR(ptr: netcp->rx_fdq[i]);
1658	goto fail;
1659	}
1660	}
1661
1662	memset(&config, 0, sizeof(config));
1663	config.direction = DMA_DEV_TO_MEM;
1664	config.u.rx.einfo_present = true;
1665	config.u.rx.psinfo_present = true;
1666	config.u.rx.err_mode = DMA_DROP;
1667	config.u.rx.desc_type = DMA_DESC_HOST;
1668	config.u.rx.psinfo_at_sop = false;
1669	config.u.rx.sop_offset = NETCP_SOP_OFFSET;
1670	config.u.rx.dst_q = netcp->rx_queue_id;
1671	config.u.rx.thresh = DMA_THRESH_NONE;
1672
1673	for (i = 0; i < KNAV_DMA_FDQ_PER_CHAN; ++i) {
1674	if (netcp->rx_fdq[i])
1675	last_fdq = knav_queue_get_id(netcp->rx_fdq[i]);
1676	config.u.rx.fdq[i] = last_fdq;
1677	}
1678
1679	netcp->rx_channel = knav_dma_open_channel(dev: netcp->netcp_device->device,
1680	name: netcp->dma_chan_name, config: &config);
1681	if (IS_ERR(ptr: netcp->rx_channel)) {
1682	dev_err(netcp->ndev_dev, "failed opening rx chan(%s\n",
1683	netcp->dma_chan_name);
1684	ret = PTR_ERR(ptr: netcp->rx_channel);
1685	goto fail;
1686	}
1687
1688	dev_dbg(netcp->ndev_dev, "opened RX channel: %p\n", netcp->rx_channel);
1689	return 0;
1690
1691	fail:
1692	netcp_free_navigator_resources(netcp);
1693	return ret;
1694	}
1695
1696	/* Open the device */
1697	static int netcp_ndo_open(struct net_device *ndev)
1698	{
1699	struct netcp_intf *netcp = netdev_priv(dev: ndev);
1700	struct netcp_intf_modpriv *intf_modpriv;
1701	struct netcp_module *module;
1702	int ret;
1703
1704	netif_carrier_off(dev: ndev);
1705	ret = netcp_setup_navigator_resources(ndev);
1706	if (ret) {
1707	dev_err(netcp->ndev_dev, "Failed to setup navigator resources\n");
1708	goto fail;
1709	}
1710
1711	for_each_module(netcp, intf_modpriv) {
1712	module = intf_modpriv->netcp_module;
1713	if (module->open) {
1714	ret = module->open(intf_modpriv->module_priv, ndev);
1715	if (ret != 0) {
1716	dev_err(netcp->ndev_dev, "module open failed\n");
1717	goto fail_open;
1718	}
1719	}
1720	}
1721
1722	napi_enable(n: &netcp->rx_napi);
1723	napi_enable(n: &netcp->tx_napi);
1724	knav_queue_enable_notify(netcp->tx_compl_q);
1725	knav_queue_enable_notify(netcp->rx_queue);
1726	netcp_rxpool_refill(netcp);
1727	netif_tx_wake_all_queues(dev: ndev);
1728	dev_dbg(netcp->ndev_dev, "netcp device %s opened\n", ndev->name);
1729	return 0;
1730
1731	fail_open:
1732	for_each_module(netcp, intf_modpriv) {
1733	module = intf_modpriv->netcp_module;
1734	if (module->close)
1735	module->close(intf_modpriv->module_priv, ndev);
1736	}
1737
1738	fail:
1739	netcp_free_navigator_resources(netcp);
1740	return ret;
1741	}
1742
1743	/* Close the device */
1744	static int netcp_ndo_stop(struct net_device *ndev)
1745	{
1746	struct netcp_intf *netcp = netdev_priv(dev: ndev);
1747	struct netcp_intf_modpriv *intf_modpriv;
1748	struct netcp_module *module;
1749	int err = 0;
1750
1751	netif_tx_stop_all_queues(dev: ndev);
1752	netif_carrier_off(dev: ndev);
1753	netcp_addr_clear_mark(netcp);
1754	netcp_addr_sweep_del(netcp);
1755	knav_queue_disable_notify(netcp->rx_queue);
1756	knav_queue_disable_notify(netcp->tx_compl_q);
1757	napi_disable(n: &netcp->rx_napi);
1758	napi_disable(n: &netcp->tx_napi);
1759
1760	for_each_module(netcp, intf_modpriv) {
1761	module = intf_modpriv->netcp_module;
1762	if (module->close) {
1763	err = module->close(intf_modpriv->module_priv, ndev);
1764	if (err != 0)
1765	dev_err(netcp->ndev_dev, "Close failed\n");
1766	}
1767	}
1768
1769	/* Recycle Rx descriptors from completion queue */
1770	netcp_empty_rx_queue(netcp);
1771
1772	/* Recycle Tx descriptors from completion queue */
1773	netcp_process_tx_compl_packets(netcp, budget: netcp->tx_pool_size);
1774
1775	if (knav_pool_count(ph: netcp->tx_pool) != netcp->tx_pool_size)
1776	dev_err(netcp->ndev_dev, "Lost (%d) Tx descs\n",
1777	netcp->tx_pool_size - knav_pool_count(netcp->tx_pool));
1778
1779	netcp_free_navigator_resources(netcp);
1780	dev_dbg(netcp->ndev_dev, "netcp device %s stopped\n", ndev->name);
1781	return 0;
1782	}
1783
1784	static int netcp_ndo_ioctl(struct net_device *ndev,
1785	struct ifreq *req, int cmd)
1786	{
1787	struct netcp_intf *netcp = netdev_priv(dev: ndev);
1788	struct netcp_intf_modpriv *intf_modpriv;
1789	struct netcp_module *module;
1790	int ret = -1, err = -EOPNOTSUPP;
1791
1792	if (!netif_running(dev: ndev))
1793	return -EINVAL;
1794
1795	for_each_module(netcp, intf_modpriv) {
1796	module = intf_modpriv->netcp_module;
1797	if (!module->ioctl)
1798	continue;
1799
1800	err = module->ioctl(intf_modpriv->module_priv, req, cmd);
1801	if ((err < 0) && (err != -EOPNOTSUPP)) {
1802	ret = err;
1803	goto out;
1804	}
1805	if (err == 0)
1806	ret = err;
1807	}
1808
1809	out:
1810	return (ret == 0) ? 0 : err;
1811	}
1812
1813	static void netcp_ndo_tx_timeout(struct net_device *ndev, unsigned int txqueue)
1814	{
1815	struct netcp_intf *netcp = netdev_priv(dev: ndev);
1816	unsigned int descs = knav_pool_count(ph: netcp->tx_pool);
1817
1818	dev_err(netcp->ndev_dev, "transmit timed out tx descs(%d)\n", descs);
1819	netcp_process_tx_compl_packets(netcp, budget: netcp->tx_pool_size);
1820	netif_trans_update(dev: ndev);
1821	netif_tx_wake_all_queues(dev: ndev);
1822	}
1823
1824	static int netcp_rx_add_vid(struct net_device *ndev, __be16 proto, u16 vid)
1825	{
1826	struct netcp_intf *netcp = netdev_priv(dev: ndev);
1827	struct netcp_intf_modpriv *intf_modpriv;
1828	struct netcp_module *module;
1829	unsigned long flags;
1830	int err = 0;
1831
1832	dev_dbg(netcp->ndev_dev, "adding rx vlan id: %d\n", vid);
1833
1834	spin_lock_irqsave(&netcp->lock, flags);
1835	for_each_module(netcp, intf_modpriv) {
1836	module = intf_modpriv->netcp_module;
1837	if ((module->add_vid) && (vid != 0)) {
1838	err = module->add_vid(intf_modpriv->module_priv, vid);
1839	if (err != 0) {
1840	dev_err(netcp->ndev_dev, "Could not add vlan id = %d\n",
1841	vid);
1842	break;
1843	}
1844	}
1845	}
1846	spin_unlock_irqrestore(lock: &netcp->lock, flags);
1847
1848	return err;
1849	}
1850
1851	static int netcp_rx_kill_vid(struct net_device *ndev, __be16 proto, u16 vid)
1852	{
1853	struct netcp_intf *netcp = netdev_priv(dev: ndev);
1854	struct netcp_intf_modpriv *intf_modpriv;
1855	struct netcp_module *module;
1856	unsigned long flags;
1857	int err = 0;
1858
1859	dev_dbg(netcp->ndev_dev, "removing rx vlan id: %d\n", vid);
1860
1861	spin_lock_irqsave(&netcp->lock, flags);
1862	for_each_module(netcp, intf_modpriv) {
1863	module = intf_modpriv->netcp_module;
1864	if (module->del_vid) {
1865	err = module->del_vid(intf_modpriv->module_priv, vid);
1866	if (err != 0) {
1867	dev_err(netcp->ndev_dev, "Could not delete vlan id = %d\n",
1868	vid);
1869	break;
1870	}
1871	}
1872	}
1873	spin_unlock_irqrestore(lock: &netcp->lock, flags);
1874	return err;
1875	}
1876
1877	static int netcp_setup_tc(struct net_device *dev, enum tc_setup_type type,
1878	void *type_data)
1879	{
1880	struct tc_mqprio_qopt *mqprio = type_data;
1881	u8 num_tc;
1882	int i;
1883
1884	/* setup tc must be called under rtnl lock */
1885	ASSERT_RTNL();
1886
1887	if (type != TC_SETUP_QDISC_MQPRIO)
1888	return -EOPNOTSUPP;
1889
1890	mqprio->hw = TC_MQPRIO_HW_OFFLOAD_TCS;
1891	num_tc = mqprio->num_tc;
1892
1893	/* Sanity-check the number of traffic classes requested */
1894	if ((dev->real_num_tx_queues <= 1) ||
1895	(dev->real_num_tx_queues < num_tc))
1896	return -EINVAL;
1897
1898	/* Configure traffic class to queue mappings */
1899	if (num_tc) {
1900	netdev_set_num_tc(dev, num_tc);
1901	for (i = 0; i < num_tc; i++)
1902	netdev_set_tc_queue(dev, tc: i, count: 1, offset: i);
1903	} else {
1904	netdev_reset_tc(dev);
1905	}
1906
1907	return 0;
1908	}
1909
1910	static void
1911	netcp_get_stats(struct net_device *ndev, struct rtnl_link_stats64 *stats)
1912	{
1913	struct netcp_intf *netcp = netdev_priv(dev: ndev);
1914	struct netcp_stats *p = &netcp->stats;
1915	u64 rxpackets, rxbytes, txpackets, txbytes;
1916	unsigned int start;
1917
1918	do {
1919	start = u64_stats_fetch_begin(syncp: &p->syncp_rx);
1920	rxpackets = p->rx_packets;
1921	rxbytes = p->rx_bytes;
1922	} while (u64_stats_fetch_retry(syncp: &p->syncp_rx, start));
1923
1924	do {
1925	start = u64_stats_fetch_begin(syncp: &p->syncp_tx);
1926	txpackets = p->tx_packets;
1927	txbytes = p->tx_bytes;
1928	} while (u64_stats_fetch_retry(syncp: &p->syncp_tx, start));
1929
1930	stats->rx_packets = rxpackets;
1931	stats->rx_bytes = rxbytes;
1932	stats->tx_packets = txpackets;
1933	stats->tx_bytes = txbytes;
1934
1935	/* The following are stored as 32 bit */
1936	stats->rx_errors = p->rx_errors;
1937	stats->rx_dropped = p->rx_dropped;
1938	stats->tx_dropped = p->tx_dropped;
1939	}
1940
1941	static const struct net_device_ops netcp_netdev_ops = {
1942	.ndo_open = netcp_ndo_open,
1943	.ndo_stop = netcp_ndo_stop,
1944	.ndo_start_xmit = netcp_ndo_start_xmit,
1945	.ndo_set_rx_mode = netcp_set_rx_mode,
1946	.ndo_eth_ioctl = netcp_ndo_ioctl,
1947	.ndo_get_stats64 = netcp_get_stats,
1948	.ndo_set_mac_address = eth_mac_addr,
1949	.ndo_validate_addr = eth_validate_addr,
1950	.ndo_vlan_rx_add_vid = netcp_rx_add_vid,
1951	.ndo_vlan_rx_kill_vid = netcp_rx_kill_vid,
1952	.ndo_tx_timeout = netcp_ndo_tx_timeout,
1953	.ndo_select_queue = dev_pick_tx_zero,
1954	.ndo_setup_tc = netcp_setup_tc,
1955	};
1956
1957	static int netcp_create_interface(struct netcp_device *netcp_device,
1958	struct device_node *node_interface)
1959	{
1960	struct device *dev = netcp_device->device;
1961	struct device_node *node = dev->of_node;
1962	struct netcp_intf *netcp;
1963	struct net_device *ndev;
1964	resource_size_t size;
1965	struct resource res;
1966	void __iomem *efuse = NULL;
1967	u32 efuse_mac = 0;
1968	u8 efuse_mac_addr[6];
1969	u32 temp[2];
1970	int ret = 0;
1971
1972	ndev = alloc_etherdev_mqs(sizeof_priv: sizeof(*netcp), txqs: 1, rxqs: 1);
1973	if (!ndev) {
1974	dev_err(dev, "Error allocating netdev\n");
1975	return -ENOMEM;
1976	}
1977
1978	ndev->features |= NETIF_F_SG;
1979	ndev->features |= NETIF_F_HW_VLAN_CTAG_FILTER;
1980	ndev->hw_features = ndev->features;
1981	ndev->vlan_features |= NETIF_F_SG;
1982
1983	/* MTU range: 68 - 9486 */
1984	ndev->min_mtu = ETH_MIN_MTU;
1985	ndev->max_mtu = NETCP_MAX_FRAME_SIZE - (ETH_HLEN + ETH_FCS_LEN);
1986
1987	netcp = netdev_priv(dev: ndev);
1988	spin_lock_init(&netcp->lock);
1989	INIT_LIST_HEAD(list: &netcp->module_head);
1990	INIT_LIST_HEAD(list: &netcp->txhook_list_head);
1991	INIT_LIST_HEAD(list: &netcp->rxhook_list_head);
1992	INIT_LIST_HEAD(list: &netcp->addr_list);
1993	u64_stats_init(syncp: &netcp->stats.syncp_rx);
1994	u64_stats_init(syncp: &netcp->stats.syncp_tx);
1995	netcp->netcp_device = netcp_device;
1996	netcp->dev = netcp_device->device;
1997	netcp->ndev = ndev;
1998	netcp->ndev_dev = &ndev->dev;
1999	netcp->msg_enable = netif_msg_init(debug_value: netcp_debug_level, NETCP_DEBUG);
2000	netcp->tx_pause_threshold = MAX_SKB_FRAGS;
2001	netcp->tx_resume_threshold = netcp->tx_pause_threshold;
2002	netcp->node_interface = node_interface;
2003
2004	ret = of_property_read_u32(np: node_interface, propname: "efuse-mac", out_value: &efuse_mac);
2005	if (efuse_mac) {
2006	if (of_address_to_resource(dev: node, NETCP_EFUSE_REG_INDEX, r: &res)) {
2007	dev_err(dev, "could not find efuse-mac reg resource\n");
2008	ret = -ENODEV;
2009	goto quit;
2010	}
2011	size = resource_size(res: &res);
2012
2013	if (!devm_request_mem_region(dev, res.start, size,
2014	dev_name(dev))) {
2015	dev_err(dev, "could not reserve resource\n");
2016	ret = -ENOMEM;
2017	goto quit;
2018	}
2019
2020	efuse = devm_ioremap(dev, offset: res.start, size);
2021	if (!efuse) {
2022	dev_err(dev, "could not map resource\n");
2023	devm_release_mem_region(dev, res.start, size);
2024	ret = -ENOMEM;
2025	goto quit;
2026	}
2027
2028	emac_arch_get_mac_addr(x: efuse_mac_addr, efuse_mac: efuse, swap: efuse_mac);
2029	if (is_valid_ether_addr(addr: efuse_mac_addr))
2030	eth_hw_addr_set(dev: ndev, addr: efuse_mac_addr);
2031	else
2032	eth_hw_addr_random(dev: ndev);
2033
2034	devm_iounmap(dev, addr: efuse);
2035	devm_release_mem_region(dev, res.start, size);
2036	} else {
2037	ret = of_get_ethdev_address(np: node_interface, dev: ndev);
2038	if (ret)
2039	eth_hw_addr_random(dev: ndev);
2040	}
2041
2042	ret = of_property_read_string(np: node_interface, propname: "rx-channel",
2043	out_string: &netcp->dma_chan_name);
2044	if (ret < 0) {
2045	dev_err(dev, "missing \"rx-channel\" parameter\n");
2046	ret = -ENODEV;
2047	goto quit;
2048	}
2049
2050	ret = of_property_read_u32(np: node_interface, propname: "rx-queue",
2051	out_value: &netcp->rx_queue_id);
2052	if (ret < 0) {
2053	dev_warn(dev, "missing \"rx-queue\" parameter\n");
2054	netcp->rx_queue_id = KNAV_QUEUE_QPEND;
2055	}
2056
2057	ret = of_property_read_u32_array(np: node_interface, propname: "rx-queue-depth",
2058	out_values: netcp->rx_queue_depths,
2059	KNAV_DMA_FDQ_PER_CHAN);
2060	if (ret < 0) {
2061	dev_err(dev, "missing \"rx-queue-depth\" parameter\n");
2062	netcp->rx_queue_depths[0] = 128;
2063	}
2064
2065	ret = of_property_read_u32_array(np: node_interface, propname: "rx-pool", out_values: temp, sz: 2);
2066	if (ret < 0) {
2067	dev_err(dev, "missing \"rx-pool\" parameter\n");
2068	ret = -ENODEV;
2069	goto quit;
2070	}
2071	netcp->rx_pool_size = temp[0];
2072	netcp->rx_pool_region_id = temp[1];
2073
2074	ret = of_property_read_u32_array(np: node_interface, propname: "tx-pool", out_values: temp, sz: 2);
2075	if (ret < 0) {
2076	dev_err(dev, "missing \"tx-pool\" parameter\n");
2077	ret = -ENODEV;
2078	goto quit;
2079	}
2080	netcp->tx_pool_size = temp[0];
2081	netcp->tx_pool_region_id = temp[1];
2082
2083	if (netcp->tx_pool_size < MAX_SKB_FRAGS) {
2084	dev_err(dev, "tx-pool size too small, must be at least %u\n",
2085	(unsigned int)MAX_SKB_FRAGS);
2086	ret = -ENODEV;
2087	goto quit;
2088	}
2089
2090	ret = of_property_read_u32(np: node_interface, propname: "tx-completion-queue",
2091	out_value: &netcp->tx_compl_qid);
2092	if (ret < 0) {
2093	dev_warn(dev, "missing \"tx-completion-queue\" parameter\n");
2094	netcp->tx_compl_qid = KNAV_QUEUE_QPEND;
2095	}
2096
2097	/* NAPI register */
2098	netif_napi_add(dev: ndev, napi: &netcp->rx_napi, poll: netcp_rx_poll);
2099	netif_napi_add_tx(dev: ndev, napi: &netcp->tx_napi, poll: netcp_tx_poll);
2100
2101	/* Register the network device */
2102	ndev->dev_id = 0;
2103	ndev->watchdog_timeo = NETCP_TX_TIMEOUT;
2104	ndev->netdev_ops = &netcp_netdev_ops;
2105	SET_NETDEV_DEV(ndev, dev);
2106
2107	list_add_tail(new: &netcp->interface_list, head: &netcp_device->interface_head);
2108	return 0;
2109
2110	quit:
2111	free_netdev(dev: ndev);
2112	return ret;
2113	}
2114
2115	static void netcp_delete_interface(struct netcp_device *netcp_device,
2116	struct net_device *ndev)
2117	{
2118	struct netcp_intf_modpriv *intf_modpriv, *tmp;
2119	struct netcp_intf *netcp = netdev_priv(dev: ndev);
2120	struct netcp_module *module;
2121
2122	dev_dbg(netcp_device->device, "Removing interface \"%s\"\n",
2123	ndev->name);
2124
2125	/* Notify each of the modules that the interface is going away */
2126	list_for_each_entry_safe(intf_modpriv, tmp, &netcp->module_head,
2127	intf_list) {
2128	module = intf_modpriv->netcp_module;
2129	dev_dbg(netcp_device->device, "Releasing module \"%s\"\n",
2130	module->name);
2131	if (module->release)
2132	module->release(intf_modpriv->module_priv);
2133	list_del(entry: &intf_modpriv->intf_list);
2134	}
2135	WARN(!list_empty(&netcp->module_head), "%s interface module list is not empty!\n",
2136	ndev->name);
2137
2138	list_del(entry: &netcp->interface_list);
2139
2140	of_node_put(node: netcp->node_interface);
2141	unregister_netdev(dev: ndev);
2142	free_netdev(dev: ndev);
2143	}
2144
2145	static int netcp_probe(struct platform_device *pdev)
2146	{
2147	struct device_node *node = pdev->dev.of_node;
2148	struct netcp_intf *netcp_intf, *netcp_tmp;
2149	struct device_node *child, *interfaces;
2150	struct netcp_device *netcp_device;
2151	struct device *dev = &pdev->dev;
2152	struct netcp_module *module;
2153	int ret;
2154
2155	if (!knav_dma_device_ready() ||
2156	!knav_qmss_device_ready())
2157	return -EPROBE_DEFER;
2158
2159	if (!node) {
2160	dev_err(dev, "could not find device info\n");
2161	return -ENODEV;
2162	}
2163
2164	/* Allocate a new NETCP device instance */
2165	netcp_device = devm_kzalloc(dev, size: sizeof(*netcp_device), GFP_KERNEL);
2166	if (!netcp_device)
2167	return -ENOMEM;
2168
2169	pm_runtime_enable(dev: &pdev->dev);
2170	ret = pm_runtime_get_sync(dev: &pdev->dev);
2171	if (ret < 0) {
2172	dev_err(dev, "Failed to enable NETCP power-domain\n");
2173	pm_runtime_disable(dev: &pdev->dev);
2174	return ret;
2175	}
2176
2177	/* Initialize the NETCP device instance */
2178	INIT_LIST_HEAD(list: &netcp_device->interface_head);
2179	INIT_LIST_HEAD(list: &netcp_device->modpriv_head);
2180	netcp_device->device = dev;
2181	platform_set_drvdata(pdev, data: netcp_device);
2182
2183	/* create interfaces */
2184	interfaces = of_get_child_by_name(node, name: "netcp-interfaces");
2185	if (!interfaces) {
2186	dev_err(dev, "could not find netcp-interfaces node\n");
2187	ret = -ENODEV;
2188	goto probe_quit;
2189	}
2190
2191	for_each_available_child_of_node(interfaces, child) {
2192	ret = netcp_create_interface(netcp_device, node_interface: child);
2193	if (ret) {
2194	dev_err(dev, "could not create interface(%pOFn)\n",
2195	child);
2196	goto probe_quit_interface;
2197	}
2198	}
2199
2200	of_node_put(node: interfaces);
2201
2202	/* Add the device instance to the list */
2203	list_add_tail(new: &netcp_device->device_list, head: &netcp_devices);
2204
2205	/* Probe & attach any modules already registered */
2206	mutex_lock(&netcp_modules_lock);
2207	for_each_netcp_module(module) {
2208	ret = netcp_module_probe(netcp_device, module);
2209	if (ret < 0)
2210	dev_err(dev, "module(%s) probe failed\n", module->name);
2211	}
2212	mutex_unlock(lock: &netcp_modules_lock);
2213	return 0;
2214
2215	probe_quit_interface:
2216	list_for_each_entry_safe(netcp_intf, netcp_tmp,
2217	&netcp_device->interface_head,
2218	interface_list) {
2219	netcp_delete_interface(netcp_device, ndev: netcp_intf->ndev);
2220	}
2221
2222	of_node_put(node: interfaces);
2223
2224	probe_quit:
2225	pm_runtime_put_sync(dev: &pdev->dev);
2226	pm_runtime_disable(dev: &pdev->dev);
2227	platform_set_drvdata(pdev, NULL);
2228	return ret;
2229	}
2230
2231	static void netcp_remove(struct platform_device *pdev)
2232	{
2233	struct netcp_device *netcp_device = platform_get_drvdata(pdev);
2234	struct netcp_intf *netcp_intf, *netcp_tmp;
2235	struct netcp_inst_modpriv *inst_modpriv, *tmp;
2236	struct netcp_module *module;
2237
2238	list_for_each_entry_safe(inst_modpriv, tmp, &netcp_device->modpriv_head,
2239	inst_list) {
2240	module = inst_modpriv->netcp_module;
2241	dev_dbg(&pdev->dev, "Removing module \"%s\"\n", module->name);
2242	module->remove(netcp_device, inst_modpriv->module_priv);
2243	list_del(entry: &inst_modpriv->inst_list);
2244	}
2245
2246	/* now that all modules are removed, clean up the interfaces */
2247	list_for_each_entry_safe(netcp_intf, netcp_tmp,
2248	&netcp_device->interface_head,
2249	interface_list) {
2250	netcp_delete_interface(netcp_device, ndev: netcp_intf->ndev);
2251	}
2252
2253	WARN(!list_empty(&netcp_device->interface_head),
2254	"%s interface list not empty!\n", pdev->name);
2255
2256	pm_runtime_put_sync(dev: &pdev->dev);
2257	pm_runtime_disable(dev: &pdev->dev);
2258	platform_set_drvdata(pdev, NULL);
2259	}
2260
2261	static const struct of_device_id of_match[] = {
2262	{ .compatible = "ti,netcp-1.0", },
2263	{},
2264	};
2265	MODULE_DEVICE_TABLE(of, of_match);
2266
2267	static struct platform_driver netcp_driver = {
2268	.driver = {
2269	.name = "netcp-1.0",
2270	.of_match_table = of_match,
2271	},
2272	.probe = netcp_probe,
2273	.remove_new = netcp_remove,
2274	};
2275	module_platform_driver(netcp_driver);
2276
2277	MODULE_LICENSE("GPL v2");
2278	MODULE_DESCRIPTION("TI NETCP driver for Keystone SOCs");
2279	MODULE_AUTHOR("Sandeep Nair <sandeep_n@ti.com");
2280