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ebpf, x86: fix general protection fault when tail call is invoked
[linux-2.6-block.git] / drivers / net / ethernet / ti / netcp_core.c
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84640e27
KM		 1/*
2 * Keystone NetCP Core driver
3 *
4 * Copyright (C) 2014 Texas Instruments Incorporated
5 * Authors: Sandeep Nair <sandeep_n@ti.com>
6 * Sandeep Paulraj <s-paulraj@ti.com>
7 * Cyril Chemparathy <cyril@ti.com>
8 * Santosh Shilimkar <santosh.shilimkar@ti.com>
9 * Murali Karicheri <m-karicheri2@ti.com>
10 * Wingman Kwok <w-kwok2@ti.com>
11 *
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License as
14 * published by the Free Software Foundation version 2.
15 *
16 * This program is distributed "as is" WITHOUT ANY WARRANTY of any
17 * kind, whether express or implied; without even the implied warranty
18 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
20 */
21
22#include <linux/io.h>
23#include <linux/module.h>
24#include <linux/of_net.h>
25#include <linux/of_address.h>
26#include <linux/if_vlan.h>
27#include <linux/pm_runtime.h>
28#include <linux/platform_device.h>
29#include <linux/soc/ti/knav_qmss.h>
30#include <linux/soc/ti/knav_dma.h>
31
32#include "netcp.h"
33
34#define NETCP_SOP_OFFSET (NET_IP_ALIGN + NET_SKB_PAD)
35#define NETCP_NAPI_WEIGHT 64
36#define NETCP_TX_TIMEOUT (5 * HZ)
37#define NETCP_MIN_PACKET_SIZE ETH_ZLEN
38#define NETCP_MAX_MCAST_ADDR 16
39
40#define NETCP_EFUSE_REG_INDEX 0
41
42#define NETCP_MOD_PROBE_SKIPPED 1
43#define NETCP_MOD_PROBE_FAILED 2
44
45#define NETCP_DEBUG (NETIF_MSG_HW | NETIF_MSG_WOL | \
46 NETIF_MSG_DRV | NETIF_MSG_LINK | \
47 NETIF_MSG_IFUP | NETIF_MSG_INTR | \
48 NETIF_MSG_PROBE | NETIF_MSG_TIMER | \
49 NETIF_MSG_IFDOWN | NETIF_MSG_RX_ERR | \
50 NETIF_MSG_TX_ERR | NETIF_MSG_TX_DONE | \
51 NETIF_MSG_PKTDATA | NETIF_MSG_TX_QUEUED | \
52 NETIF_MSG_RX_STATUS)
53
54#define knav_queue_get_id(q) knav_queue_device_control(q, \
55 KNAV_QUEUE_GET_ID, (unsigned long)NULL)
56
57#define knav_queue_enable_notify(q) knav_queue_device_control(q, \
58 KNAV_QUEUE_ENABLE_NOTIFY, \
59 (unsigned long)NULL)
60
61#define knav_queue_disable_notify(q) knav_queue_device_control(q, \
62 KNAV_QUEUE_DISABLE_NOTIFY, \
63 (unsigned long)NULL)
64
65#define knav_queue_get_count(q) knav_queue_device_control(q, \
66 KNAV_QUEUE_GET_COUNT, (unsigned long)NULL)
67
68#define for_each_netcp_module(module) \
69 list_for_each_entry(module, &netcp_modules, module_list)
70
71#define for_each_netcp_device_module(netcp_device, inst_modpriv) \
72 list_for_each_entry(inst_modpriv, \
73 &((netcp_device)->modpriv_head), inst_list)
74
75#define for_each_module(netcp, intf_modpriv) \
76 list_for_each_entry(intf_modpriv, &netcp->module_head, intf_list)
77
78/* Module management structures */
79struct netcp_device {
80 struct list_head device_list;
81 struct list_head interface_head;
82 struct list_head modpriv_head;
83 struct device *device;
84};
85
86struct netcp_inst_modpriv {
87 struct netcp_device *netcp_device;
88 struct netcp_module *netcp_module;
89 struct list_head inst_list;
90 void *module_priv;
91};
92
93struct netcp_intf_modpriv {
94 struct netcp_intf *netcp_priv;
95 struct netcp_module *netcp_module;
96 struct list_head intf_list;
97 void *module_priv;
98};
99
100static LIST_HEAD(netcp_devices);
101static LIST_HEAD(netcp_modules);
102static DEFINE_MUTEX(netcp_modules_lock);
103
104static int netcp_debug_level = -1;
105module_param(netcp_debug_level, int, 0);
106MODULE_PARM_DESC(netcp_debug_level, "Netcp debug level (NETIF_MSG bits) (0=none,...,16=all)");
107
108/* Helper functions - Get/Set */
109static void get_pkt_info(u32 *buff, u32 *buff_len, u32 *ndesc,
110 struct knav_dma_desc *desc)
111{
112 *buff_len = desc->buff_len;
113 *buff = desc->buff;
114 *ndesc = desc->next_desc;
115}
116
117static void get_pad_info(u32 *pad0, u32 *pad1, struct knav_dma_desc *desc)
118{
119 *pad0 = desc->pad[0];
120 *pad1 = desc->pad[1];
121}
122
123static void get_org_pkt_info(u32 *buff, u32 *buff_len,
124 struct knav_dma_desc *desc)
125{
126 *buff = desc->orig_buff;
127 *buff_len = desc->orig_len;
128}
129
130static void get_words(u32 *words, int num_words, u32 *desc)
131{
132 int i;
133
134 for (i = 0; i < num_words; i++)
135 words[i] = desc[i];
136}
137
138static void set_pkt_info(u32 buff, u32 buff_len, u32 ndesc,
139 struct knav_dma_desc *desc)
140{
141 desc->buff_len = buff_len;
142 desc->buff = buff;
143 desc->next_desc = ndesc;
144}
145
146static void set_desc_info(u32 desc_info, u32 pkt_info,
147 struct knav_dma_desc *desc)
148{
149 desc->desc_info = desc_info;
150 desc->packet_info = pkt_info;
151}
152
153static void set_pad_info(u32 pad0, u32 pad1, struct knav_dma_desc *desc)
154{
155 desc->pad[0] = pad0;
156 desc->pad[1] = pad1;
157}
158
159static void set_org_pkt_info(u32 buff, u32 buff_len,
160 struct knav_dma_desc *desc)
161{
162 desc->orig_buff = buff;
163 desc->orig_len = buff_len;
164}
165
166static void set_words(u32 *words, int num_words, u32 *desc)
167{
168 int i;
169
170 for (i = 0; i < num_words; i++)
171 desc[i] = words[i];
172}
173
174/* Read the e-fuse value as 32 bit values to be endian independent */
175static int emac_arch_get_mac_addr(char *x, void __iomem *efuse_mac)
176{
177 unsigned int addr0, addr1;
178
179 addr1 = readl(efuse_mac + 4);
180 addr0 = readl(efuse_mac);
181
182 x[0] = (addr1 & 0x0000ff00) >> 8;
183 x[1] = addr1 & 0x000000ff;
184 x[2] = (addr0 & 0xff000000) >> 24;
185 x[3] = (addr0 & 0x00ff0000) >> 16;
186 x[4] = (addr0 & 0x0000ff00) >> 8;
187 x[5] = addr0 & 0x000000ff;
188
189 return 0;
190}
191
192static const char *netcp_node_name(struct device_node *node)
193{
194 const char *name;
195
196 if (of_property_read_string(node, "label", &name) < 0)
197 name = node->name;
198 if (!name)
199 name = "unknown";
200 return name;
201}
202
203/* Module management routines */
204static int netcp_register_interface(struct netcp_intf *netcp)
205{
206 int ret;
207
208 ret = register_netdev(netcp->ndev);
209 if (!ret)
210 netcp->netdev_registered = true;
211 return ret;
212}
213
214static int netcp_module_probe(struct netcp_device *netcp_device,
215 struct netcp_module *module)
216{
217 struct device *dev = netcp_device->device;
218 struct device_node *devices, *interface, *node = dev->of_node;
219 struct device_node *child;
220 struct netcp_inst_modpriv *inst_modpriv;
221 struct netcp_intf *netcp_intf;
222 struct netcp_module *tmp;
223 bool primary_module_registered = false;
224 int ret;
225
226 /* Find this module in the sub-tree for this device */
227 devices = of_get_child_by_name(node, "netcp-devices");
228 if (!devices) {
229 dev_err(dev, "could not find netcp-devices node\n");
230 return NETCP_MOD_PROBE_SKIPPED;
231 }
232
233 for_each_available_child_of_node(devices, child) {
234 const char *name = netcp_node_name(child);
235
236 if (!strcasecmp(module->name, name))
237 break;
238 }
239
240 of_node_put(devices);
241 /* If module not used for this device, skip it */
242 if (!child) {
243 dev_warn(dev, "module(%s) not used for device\n", module->name);
244 return NETCP_MOD_PROBE_SKIPPED;
245 }
246
247 inst_modpriv = devm_kzalloc(dev, sizeof(*inst_modpriv), GFP_KERNEL);
248 if (!inst_modpriv) {
249 of_node_put(child);
250 return -ENOMEM;
251 }
252
253 inst_modpriv->netcp_device = netcp_device;
254 inst_modpriv->netcp_module = module;
255 list_add_tail(&inst_modpriv->inst_list, &netcp_device->modpriv_head);
256
257 ret = module->probe(netcp_device, dev, child,
258 &inst_modpriv->module_priv);
259 of_node_put(child);
260 if (ret) {
261 dev_err(dev, "Probe of module(%s) failed with %d\n",
262 module->name, ret);
263 list_del(&inst_modpriv->inst_list);
264 devm_kfree(dev, inst_modpriv);
265 return NETCP_MOD_PROBE_FAILED;
266 }
267
268 /* Attach modules only if the primary module is probed */
269 for_each_netcp_module(tmp) {
270 if (tmp->primary)
271 primary_module_registered = true;
272 }
273
274 if (!primary_module_registered)
275 return 0;
276
277 /* Attach module to interfaces */
278 list_for_each_entry(netcp_intf, &netcp_device->interface_head,
279 interface_list) {
280 struct netcp_intf_modpriv *intf_modpriv;
281
282 /* If interface not registered then register now */
283 if (!netcp_intf->netdev_registered)
284 ret = netcp_register_interface(netcp_intf);
285
286 if (ret)
287 return -ENODEV;
288
289 intf_modpriv = devm_kzalloc(dev, sizeof(*intf_modpriv),
290 GFP_KERNEL);
291 if (!intf_modpriv)
292 return -ENOMEM;
293
294 interface = of_parse_phandle(netcp_intf->node_interface,
295 module->name, 0);
296
297 intf_modpriv->netcp_priv = netcp_intf;
298 intf_modpriv->netcp_module = module;
299 list_add_tail(&intf_modpriv->intf_list,
300 &netcp_intf->module_head);
301
302 ret = module->attach(inst_modpriv->module_priv,
303 netcp_intf->ndev, interface,
304 &intf_modpriv->module_priv);
305 of_node_put(interface);
306 if (ret) {
307 dev_dbg(dev, "Attach of module %s declined with %d\n",
308 module->name, ret);
309 list_del(&intf_modpriv->intf_list);
310 devm_kfree(dev, intf_modpriv);
311 continue;
312 }
313 }
314 return 0;
315}
316
317int netcp_register_module(struct netcp_module *module)
318{
319 struct netcp_device *netcp_device;
320 struct netcp_module *tmp;
321 int ret;
322
323 if (!module->name) {
324 WARN(1, "error registering netcp module: no name\n");
325 return -EINVAL;
326 }
327
328 if (!module->probe) {
329 WARN(1, "error registering netcp module: no probe\n");
330 return -EINVAL;
331 }
332
333 mutex_lock(&netcp_modules_lock);
334
335 for_each_netcp_module(tmp) {
336 if (!strcasecmp(tmp->name, module->name)) {
337 mutex_unlock(&netcp_modules_lock);
338 return -EEXIST;
339 }
340 }
341 list_add_tail(&module->module_list, &netcp_modules);
342
343 list_for_each_entry(netcp_device, &netcp_devices, device_list) {
344 ret = netcp_module_probe(netcp_device, module);
345 if (ret < 0)
346 goto fail;
347 }
348
349 mutex_unlock(&netcp_modules_lock);
350 return 0;
351
352fail:
353 mutex_unlock(&netcp_modules_lock);
354 netcp_unregister_module(module);
355 return ret;
356}
58c11b5f 357EXPORT_SYMBOL_GPL(netcp_register_module);
84640e27
KM		 358
359static void netcp_release_module(struct netcp_device *netcp_device,
360 struct netcp_module *module)
361{
362 struct netcp_inst_modpriv *inst_modpriv, *inst_tmp;
363 struct netcp_intf *netcp_intf, *netcp_tmp;
364 struct device *dev = netcp_device->device;
365
366 /* Release the module from each interface */
367 list_for_each_entry_safe(netcp_intf, netcp_tmp,
368 &netcp_device->interface_head,
369 interface_list) {
370 struct netcp_intf_modpriv *intf_modpriv, *intf_tmp;
371
372 list_for_each_entry_safe(intf_modpriv, intf_tmp,
373 &netcp_intf->module_head,
374 intf_list) {
375 if (intf_modpriv->netcp_module == module) {
376 module->release(intf_modpriv->module_priv);
377 list_del(&intf_modpriv->intf_list);
378 devm_kfree(dev, intf_modpriv);
379 break;
380 }
381 }
382 }
383
384 /* Remove the module from each instance */
385 list_for_each_entry_safe(inst_modpriv, inst_tmp,
386 &netcp_device->modpriv_head, inst_list) {
387 if (inst_modpriv->netcp_module == module) {
388 module->remove(netcp_device,
389 inst_modpriv->module_priv);
390 list_del(&inst_modpriv->inst_list);
391 devm_kfree(dev, inst_modpriv);
392 break;
393 }
394 }
395}
396
397void netcp_unregister_module(struct netcp_module *module)
398{
399 struct netcp_device *netcp_device;
400 struct netcp_module *module_tmp;
401
402 mutex_lock(&netcp_modules_lock);
403
404 list_for_each_entry(netcp_device, &netcp_devices, device_list) {
405 netcp_release_module(netcp_device, module);
406 }
407
408 /* Remove the module from the module list */
409 for_each_netcp_module(module_tmp) {
410 if (module == module_tmp) {
411 list_del(&module->module_list);
412 break;
413 }
414 }
415
416 mutex_unlock(&netcp_modules_lock);
417}
58c11b5f 418EXPORT_SYMBOL_GPL(netcp_unregister_module);
84640e27
KM		 419
420void *netcp_module_get_intf_data(struct netcp_module *module,
421 struct netcp_intf *intf)
422{
423 struct netcp_intf_modpriv *intf_modpriv;
424
425 list_for_each_entry(intf_modpriv, &intf->module_head, intf_list)
426 if (intf_modpriv->netcp_module == module)
427 return intf_modpriv->module_priv;
428 return NULL;
429}
58c11b5f 430EXPORT_SYMBOL_GPL(netcp_module_get_intf_data);
84640e27
KM		 431
432/* Module TX and RX Hook management */
433struct netcp_hook_list {
434 struct list_head list;
435 netcp_hook_rtn *hook_rtn;
436 void *hook_data;
437 int order;
438};
439
440int netcp_register_txhook(struct netcp_intf *netcp_priv, int order,
441 netcp_hook_rtn *hook_rtn, void *hook_data)
442{
443 struct netcp_hook_list *entry;
444 struct netcp_hook_list *next;
445 unsigned long flags;
446
447 entry = devm_kzalloc(netcp_priv->dev, sizeof(*entry), GFP_KERNEL);
448 if (!entry)
449 return -ENOMEM;
450
451 entry->hook_rtn = hook_rtn;
452 entry->hook_data = hook_data;
453 entry->order = order;
454
455 spin_lock_irqsave(&netcp_priv->lock, flags);
456 list_for_each_entry(next, &netcp_priv->txhook_list_head, list) {
457 if (next->order > order)
458 break;
459 }
460 __list_add(&entry->list, next->list.prev, &next->list);
461 spin_unlock_irqrestore(&netcp_priv->lock, flags);
462
463 return 0;
464}
58c11b5f 465EXPORT_SYMBOL_GPL(netcp_register_txhook);
84640e27
KM		 466
467int netcp_unregister_txhook(struct netcp_intf *netcp_priv, int order,
468 netcp_hook_rtn *hook_rtn, void *hook_data)
469{
470 struct netcp_hook_list *next, *n;
471 unsigned long flags;
472
473 spin_lock_irqsave(&netcp_priv->lock, flags);
474 list_for_each_entry_safe(next, n, &netcp_priv->txhook_list_head, list) {
475 if ((next->order == order) &&
476 (next->hook_rtn == hook_rtn) &&
477 (next->hook_data == hook_data)) {
478 list_del(&next->list);
479 spin_unlock_irqrestore(&netcp_priv->lock, flags);
480 devm_kfree(netcp_priv->dev, next);
481 return 0;
482 }
483 }
484 spin_unlock_irqrestore(&netcp_priv->lock, flags);
485 return -ENOENT;
486}
58c11b5f 487EXPORT_SYMBOL_GPL(netcp_unregister_txhook);
84640e27
KM		 488
489int netcp_register_rxhook(struct netcp_intf *netcp_priv, int order,
490 netcp_hook_rtn *hook_rtn, void *hook_data)
491{
492 struct netcp_hook_list *entry;
493 struct netcp_hook_list *next;
494 unsigned long flags;
495
496 entry = devm_kzalloc(netcp_priv->dev, sizeof(*entry), GFP_KERNEL);
497 if (!entry)
498 return -ENOMEM;
499
500 entry->hook_rtn = hook_rtn;
501 entry->hook_data = hook_data;
502 entry->order = order;
503
504 spin_lock_irqsave(&netcp_priv->lock, flags);
505 list_for_each_entry(next, &netcp_priv->rxhook_list_head, list) {
506 if (next->order > order)
507 break;
508 }
509 __list_add(&entry->list, next->list.prev, &next->list);
510 spin_unlock_irqrestore(&netcp_priv->lock, flags);
511
512 return 0;
513}
514
515int netcp_unregister_rxhook(struct netcp_intf *netcp_priv, int order,
516 netcp_hook_rtn *hook_rtn, void *hook_data)
517{
518 struct netcp_hook_list *next, *n;
519 unsigned long flags;
520
521 spin_lock_irqsave(&netcp_priv->lock, flags);
522 list_for_each_entry_safe(next, n, &netcp_priv->rxhook_list_head, list) {
523 if ((next->order == order) &&
524 (next->hook_rtn == hook_rtn) &&
525 (next->hook_data == hook_data)) {
526 list_del(&next->list);
527 spin_unlock_irqrestore(&netcp_priv->lock, flags);
528 devm_kfree(netcp_priv->dev, next);
529 return 0;
530 }
531 }
532 spin_unlock_irqrestore(&netcp_priv->lock, flags);
533
534 return -ENOENT;
535}
536
537static void netcp_frag_free(bool is_frag, void *ptr)
538{
539 if (is_frag)
7d525c4e 540 skb_free_frag(ptr);
84640e27
KM		 541 else
542 kfree(ptr);
543}
544
545static void netcp_free_rx_desc_chain(struct netcp_intf *netcp,
546 struct knav_dma_desc *desc)
547{
548 struct knav_dma_desc *ndesc;
549 dma_addr_t dma_desc, dma_buf;
550 unsigned int buf_len, dma_sz = sizeof(*ndesc);
551 void *buf_ptr;
552 u32 tmp;
553
554 get_words(&dma_desc, 1, &desc->next_desc);
555
556 while (dma_desc) {
557 ndesc = knav_pool_desc_unmap(netcp->rx_pool, dma_desc, dma_sz);
558 if (unlikely(!ndesc)) {
559 dev_err(netcp->ndev_dev, "failed to unmap Rx desc\n");
560 break;
561 }
562 get_pkt_info(&dma_buf, &tmp, &dma_desc, ndesc);
563 get_pad_info((u32 *)&buf_ptr, &tmp, ndesc);
564 dma_unmap_page(netcp->dev, dma_buf, PAGE_SIZE, DMA_FROM_DEVICE);
565 __free_page(buf_ptr);
566 knav_pool_desc_put(netcp->rx_pool, desc);
567 }
568
569 get_pad_info((u32 *)&buf_ptr, &buf_len, desc);
570 if (buf_ptr)
571 netcp_frag_free(buf_len <= PAGE_SIZE, buf_ptr);
572 knav_pool_desc_put(netcp->rx_pool, desc);
573}
574
575static void netcp_empty_rx_queue(struct netcp_intf *netcp)
576{
577 struct knav_dma_desc *desc;
578 unsigned int dma_sz;
579 dma_addr_t dma;
580
581 for (; ;) {
582 dma = knav_queue_pop(netcp->rx_queue, &dma_sz);
583 if (!dma)
584 break;
585
586 desc = knav_pool_desc_unmap(netcp->rx_pool, dma, dma_sz);
587 if (unlikely(!desc)) {
588 dev_err(netcp->ndev_dev, "%s: failed to unmap Rx desc\n",
589 __func__);
590 netcp->ndev->stats.rx_errors++;
591 continue;
592 }
593 netcp_free_rx_desc_chain(netcp, desc);
594 netcp->ndev->stats.rx_dropped++;
595 }
596}
597
598static int netcp_process_one_rx_packet(struct netcp_intf *netcp)
599{
600 unsigned int dma_sz, buf_len, org_buf_len;
601 struct knav_dma_desc *desc, *ndesc;
602 unsigned int pkt_sz = 0, accum_sz;
603 struct netcp_hook_list *rx_hook;
604 dma_addr_t dma_desc, dma_buff;
605 struct netcp_packet p_info;
606 struct sk_buff *skb;
607 void *org_buf_ptr;
608 u32 tmp;
609
610 dma_desc = knav_queue_pop(netcp->rx_queue, &dma_sz);
611 if (!dma_desc)
612 return -1;
613
614 desc = knav_pool_desc_unmap(netcp->rx_pool, dma_desc, dma_sz);
615 if (unlikely(!desc)) {
616 dev_err(netcp->ndev_dev, "failed to unmap Rx desc\n");
617 return 0;
618 }
619
620 get_pkt_info(&dma_buff, &buf_len, &dma_desc, desc);
621 get_pad_info((u32 *)&org_buf_ptr, &org_buf_len, desc);
622
623 if (unlikely(!org_buf_ptr)) {
624 dev_err(netcp->ndev_dev, "NULL bufptr in desc\n");
625 goto free_desc;
626 }
627
628 pkt_sz &= KNAV_DMA_DESC_PKT_LEN_MASK;
629 accum_sz = buf_len;
630 dma_unmap_single(netcp->dev, dma_buff, buf_len, DMA_FROM_DEVICE);
631
632 /* Build a new sk_buff for the primary buffer */
633 skb = build_skb(org_buf_ptr, org_buf_len);
634 if (unlikely(!skb)) {
635 dev_err(netcp->ndev_dev, "build_skb() failed\n");
636 goto free_desc;
637 }
638
639 /* update data, tail and len */
640 skb_reserve(skb, NETCP_SOP_OFFSET);
641 __skb_put(skb, buf_len);
642
643 /* Fill in the page fragment list */
644 while (dma_desc) {
645 struct page *page;
646
647 ndesc = knav_pool_desc_unmap(netcp->rx_pool, dma_desc, dma_sz);
648 if (unlikely(!ndesc)) {
649 dev_err(netcp->ndev_dev, "failed to unmap Rx desc\n");
650 goto free_desc;
651 }
652
653 get_pkt_info(&dma_buff, &buf_len, &dma_desc, ndesc);
654 get_pad_info((u32 *)&page, &tmp, ndesc);
655
656 if (likely(dma_buff && buf_len && page)) {
657 dma_unmap_page(netcp->dev, dma_buff, PAGE_SIZE,
658 DMA_FROM_DEVICE);
659 } else {
660 dev_err(netcp->ndev_dev, "Bad Rx desc dma_buff(%p), len(%d), page(%p)\n",
661 (void *)dma_buff, buf_len, page);
662 goto free_desc;
663 }
664
665 skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, page,
666 offset_in_page(dma_buff), buf_len, PAGE_SIZE);
667 accum_sz += buf_len;
668
669 /* Free the descriptor */
670 knav_pool_desc_put(netcp->rx_pool, ndesc);
671 }
672
673 /* Free the primary descriptor */
674 knav_pool_desc_put(netcp->rx_pool, desc);
675
676 /* check for packet len and warn */
677 if (unlikely(pkt_sz != accum_sz))
678 dev_dbg(netcp->ndev_dev, "mismatch in packet size(%d) & sum of fragments(%d)\n",
679 pkt_sz, accum_sz);
680
681 /* Remove ethernet FCS from the packet */
682 __pskb_trim(skb, skb->len - ETH_FCS_LEN);
683
684 /* Call each of the RX hooks */
685 p_info.skb = skb;
686 p_info.rxtstamp_complete = false;
687 list_for_each_entry(rx_hook, &netcp->rxhook_list_head, list) {
688 int ret;
689
690 ret = rx_hook->hook_rtn(rx_hook->order, rx_hook->hook_data,
691 &p_info);
692 if (unlikely(ret)) {
693 dev_err(netcp->ndev_dev, "RX hook %d failed: %d\n",
694 rx_hook->order, ret);
695 netcp->ndev->stats.rx_errors++;
696 dev_kfree_skb(skb);
697 return 0;
698 }
699 }
700
84640e27
KM		 701 netcp->ndev->stats.rx_packets++;
702 netcp->ndev->stats.rx_bytes += skb->len;
703
704 /* push skb up the stack */
705 skb->protocol = eth_type_trans(skb, netcp->ndev);
706 netif_receive_skb(skb);
707 return 0;
708
709free_desc:
710 netcp_free_rx_desc_chain(netcp, desc);
711 netcp->ndev->stats.rx_errors++;
712 return 0;
713}
714
715static int netcp_process_rx_packets(struct netcp_intf *netcp,
716 unsigned int budget)
717{
718 int i;
719
720 for (i = 0; (i < budget) && !netcp_process_one_rx_packet(netcp); i++)
721 ;
722 return i;
723}
724
725/* Release descriptors and attached buffers from Rx FDQ */
726static void netcp_free_rx_buf(struct netcp_intf *netcp, int fdq)
727{
728 struct knav_dma_desc *desc;
729 unsigned int buf_len, dma_sz;
730 dma_addr_t dma;
731 void *buf_ptr;
732 u32 tmp;
733
734 /* Allocate descriptor */
735 while ((dma = knav_queue_pop(netcp->rx_fdq[fdq], &dma_sz))) {
736 desc = knav_pool_desc_unmap(netcp->rx_pool, dma, dma_sz);
737 if (unlikely(!desc)) {
738 dev_err(netcp->ndev_dev, "failed to unmap Rx desc\n");
739 continue;
740 }
741
742 get_org_pkt_info(&dma, &buf_len, desc);
743 get_pad_info((u32 *)&buf_ptr, &tmp, desc);
744
745 if (unlikely(!dma)) {
746 dev_err(netcp->ndev_dev, "NULL orig_buff in desc\n");
747 knav_pool_desc_put(netcp->rx_pool, desc);
748 continue;
749 }
750
751 if (unlikely(!buf_ptr)) {
752 dev_err(netcp->ndev_dev, "NULL bufptr in desc\n");
753 knav_pool_desc_put(netcp->rx_pool, desc);
754 continue;
755 }
756
757 if (fdq == 0) {
758 dma_unmap_single(netcp->dev, dma, buf_len,
759 DMA_FROM_DEVICE);
760 netcp_frag_free((buf_len <= PAGE_SIZE), buf_ptr);
761 } else {
762 dma_unmap_page(netcp->dev, dma, buf_len,
763 DMA_FROM_DEVICE);
764 __free_page(buf_ptr);
765 }
766
767 knav_pool_desc_put(netcp->rx_pool, desc);
768 }
769}
770
771static void netcp_rxpool_free(struct netcp_intf *netcp)
772{
773 int i;
774
775 for (i = 0; i < KNAV_DMA_FDQ_PER_CHAN &&
776 !IS_ERR_OR_NULL(netcp->rx_fdq[i]); i++)
777 netcp_free_rx_buf(netcp, i);
778
779 if (knav_pool_count(netcp->rx_pool) != netcp->rx_pool_size)
780 dev_err(netcp->ndev_dev, "Lost Rx (%d) descriptors\n",
781 netcp->rx_pool_size - knav_pool_count(netcp->rx_pool));
782
783 knav_pool_destroy(netcp->rx_pool);
784 netcp->rx_pool = NULL;
785}
786
787static void netcp_allocate_rx_buf(struct netcp_intf *netcp, int fdq)
788{
789 struct knav_dma_desc *hwdesc;
790 unsigned int buf_len, dma_sz;
791 u32 desc_info, pkt_info;
792 struct page *page;
793 dma_addr_t dma;
794 void *bufptr;
795 u32 pad[2];
796
797 /* Allocate descriptor */
798 hwdesc = knav_pool_desc_get(netcp->rx_pool);
799 if (IS_ERR_OR_NULL(hwdesc)) {
800 dev_dbg(netcp->ndev_dev, "out of rx pool desc\n");
801 return;
802 }
803
804 if (likely(fdq == 0)) {
805 unsigned int primary_buf_len;
806 /* Allocate a primary receive queue entry */
807 buf_len = netcp->rx_buffer_sizes[0] + NETCP_SOP_OFFSET;
808 primary_buf_len = SKB_DATA_ALIGN(buf_len) +
809 SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
810
811 if (primary_buf_len <= PAGE_SIZE) {
812 bufptr = netdev_alloc_frag(primary_buf_len);
813 pad[1] = primary_buf_len;
814 } else {
815 bufptr = kmalloc(primary_buf_len, GFP_ATOMIC |
816 GFP_DMA32 | __GFP_COLD);
817 pad[1] = 0;
818 }
819
820 if (unlikely(!bufptr)) {
821 dev_warn_ratelimited(netcp->ndev_dev, "Primary RX buffer alloc failed\n");
822 goto fail;
823 }
824 dma = dma_map_single(netcp->dev, bufptr, buf_len,
825 DMA_TO_DEVICE);
826 pad[0] = (u32)bufptr;
827
828 } else {
829 /* Allocate a secondary receive queue entry */
830 page = alloc_page(GFP_ATOMIC | GFP_DMA32 | __GFP_COLD);
831 if (unlikely(!page)) {
832 dev_warn_ratelimited(netcp->ndev_dev, "Secondary page alloc failed\n");
833 goto fail;
834 }
835 buf_len = PAGE_SIZE;
836 dma = dma_map_page(netcp->dev, page, 0, buf_len, DMA_TO_DEVICE);
837 pad[0] = (u32)page;
838 pad[1] = 0;
839 }
840
841 desc_info = KNAV_DMA_DESC_PS_INFO_IN_DESC;
842 desc_info |= buf_len & KNAV_DMA_DESC_PKT_LEN_MASK;
843 pkt_info = KNAV_DMA_DESC_HAS_EPIB;
844 pkt_info |= KNAV_DMA_NUM_PS_WORDS << KNAV_DMA_DESC_PSLEN_SHIFT;
845 pkt_info |= (netcp->rx_queue_id & KNAV_DMA_DESC_RETQ_MASK) <<
846 KNAV_DMA_DESC_RETQ_SHIFT;
847 set_org_pkt_info(dma, buf_len, hwdesc);
848 set_pad_info(pad[0], pad[1], hwdesc);
849 set_desc_info(desc_info, pkt_info, hwdesc);
850
851 /* Push to FDQs */
852 knav_pool_desc_map(netcp->rx_pool, hwdesc, sizeof(*hwdesc), &dma,
853 &dma_sz);
854 knav_queue_push(netcp->rx_fdq[fdq], dma, sizeof(*hwdesc), 0);
855 return;
856
857fail:
858 knav_pool_desc_put(netcp->rx_pool, hwdesc);
859}
860
861/* Refill Rx FDQ with descriptors & attached buffers */
862static void netcp_rxpool_refill(struct netcp_intf *netcp)
863{
864 u32 fdq_deficit[KNAV_DMA_FDQ_PER_CHAN] = {0};
865 int i;
866
867 /* Calculate the FDQ deficit and refill */
868 for (i = 0; i < KNAV_DMA_FDQ_PER_CHAN && netcp->rx_fdq[i]; i++) {
869 fdq_deficit[i] = netcp->rx_queue_depths[i] -
870 knav_queue_get_count(netcp->rx_fdq[i]);
871
872 while (fdq_deficit[i]--)
873 netcp_allocate_rx_buf(netcp, i);
874 } /* end for fdqs */
875}
876
877/* NAPI poll */
878static int netcp_rx_poll(struct napi_struct *napi, int budget)
879{
880 struct netcp_intf *netcp = container_of(napi, struct netcp_intf,
881 rx_napi);
882 unsigned int packets;
883
884 packets = netcp_process_rx_packets(netcp, budget);
885
886 if (packets < budget) {
887 napi_complete(&netcp->rx_napi);
888 knav_queue_enable_notify(netcp->rx_queue);
889 }
890
891 netcp_rxpool_refill(netcp);
892 return packets;
893}
894
895static void netcp_rx_notify(void *arg)
896{
897 struct netcp_intf *netcp = arg;
898
899 knav_queue_disable_notify(netcp->rx_queue);
900 napi_schedule(&netcp->rx_napi);
901}
902
903static void netcp_free_tx_desc_chain(struct netcp_intf *netcp,
904 struct knav_dma_desc *desc,
905 unsigned int desc_sz)
906{
907 struct knav_dma_desc *ndesc = desc;
908 dma_addr_t dma_desc, dma_buf;
909 unsigned int buf_len;
910
911 while (ndesc) {
912 get_pkt_info(&dma_buf, &buf_len, &dma_desc, ndesc);
913
914 if (dma_buf && buf_len)
915 dma_unmap_single(netcp->dev, dma_buf, buf_len,
916 DMA_TO_DEVICE);
917 else
918 dev_warn(netcp->ndev_dev, "bad Tx desc buf(%p), len(%d)\n",
919 (void *)dma_buf, buf_len);
920
921 knav_pool_desc_put(netcp->tx_pool, ndesc);
922 ndesc = NULL;
923 if (dma_desc) {
924 ndesc = knav_pool_desc_unmap(netcp->tx_pool, dma_desc,
925 desc_sz);
926 if (!ndesc)
927 dev_err(netcp->ndev_dev, "failed to unmap Tx desc\n");
928 }
929 }
930}
931
932static int netcp_process_tx_compl_packets(struct netcp_intf *netcp,
933 unsigned int budget)
934{
935 struct knav_dma_desc *desc;
936 struct sk_buff *skb;
937 unsigned int dma_sz;
938 dma_addr_t dma;
939 int pkts = 0;
940 u32 tmp;
941
942 while (budget--) {
943 dma = knav_queue_pop(netcp->tx_compl_q, &dma_sz);
944 if (!dma)
945 break;
946 desc = knav_pool_desc_unmap(netcp->tx_pool, dma, dma_sz);
947 if (unlikely(!desc)) {
948 dev_err(netcp->ndev_dev, "failed to unmap Tx desc\n");
949 netcp->ndev->stats.tx_errors++;
950 continue;
951 }
952
953 get_pad_info((u32 *)&skb, &tmp, desc);
954 netcp_free_tx_desc_chain(netcp, desc, dma_sz);
955 if (!skb) {
956 dev_err(netcp->ndev_dev, "No skb in Tx desc\n");
957 netcp->ndev->stats.tx_errors++;
958 continue;
959 }
960
961 if (netif_subqueue_stopped(netcp->ndev, skb) &&
962 netif_running(netcp->ndev) &&
963 (knav_pool_count(netcp->tx_pool) >
964 netcp->tx_resume_threshold)) {
965 u16 subqueue = skb_get_queue_mapping(skb);
966
967 netif_wake_subqueue(netcp->ndev, subqueue);
968 }
969
970 netcp->ndev->stats.tx_packets++;
971 netcp->ndev->stats.tx_bytes += skb->len;
972 dev_kfree_skb(skb);
973 pkts++;
974 }
975 return pkts;
976}
977
978static int netcp_tx_poll(struct napi_struct *napi, int budget)
979{
980 int packets;
981 struct netcp_intf *netcp = container_of(napi, struct netcp_intf,
982 tx_napi);
983
984 packets = netcp_process_tx_compl_packets(netcp, budget);
985 if (packets < budget) {
986 napi_complete(&netcp->tx_napi);
987 knav_queue_enable_notify(netcp->tx_compl_q);
988 }
989
990 return packets;
991}
992
993static void netcp_tx_notify(void *arg)
994{
995 struct netcp_intf *netcp = arg;
996
997 knav_queue_disable_notify(netcp->tx_compl_q);
998 napi_schedule(&netcp->tx_napi);
999}
1000
1001static struct knav_dma_desc*
1002netcp_tx_map_skb(struct sk_buff *skb, struct netcp_intf *netcp)
1003{
1004 struct knav_dma_desc *desc, *ndesc, *pdesc;
1005 unsigned int pkt_len = skb_headlen(skb);
1006 struct device *dev = netcp->dev;
1007 dma_addr_t dma_addr;
1008 unsigned int dma_sz;
1009 int i;
1010
1011 /* Map the linear buffer */
1012 dma_addr = dma_map_single(dev, skb->data, pkt_len, DMA_TO_DEVICE);
1013 if (unlikely(!dma_addr)) {
1014 dev_err(netcp->ndev_dev, "Failed to map skb buffer\n");
1015 return NULL;
1016 }
1017
1018 desc = knav_pool_desc_get(netcp->tx_pool);
1019 if (unlikely(IS_ERR_OR_NULL(desc))) {
1020 dev_err(netcp->ndev_dev, "out of TX desc\n");
1021 dma_unmap_single(dev, dma_addr, pkt_len, DMA_TO_DEVICE);
1022 return NULL;
1023 }
1024
1025 set_pkt_info(dma_addr, pkt_len, 0, desc);
1026 if (skb_is_nonlinear(skb)) {
1027 prefetchw(skb_shinfo(skb));
1028 } else {
1029 desc->next_desc = 0;
1030 goto upd_pkt_len;
1031 }
1032
1033 pdesc = desc;
1034
1035 /* Handle the case where skb is fragmented in pages */
1036 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1037 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1038 struct page *page = skb_frag_page(frag);
1039 u32 page_offset = frag->page_offset;
1040 u32 buf_len = skb_frag_size(frag);
1041 dma_addr_t desc_dma;
1042 u32 pkt_info;
1043
1044 dma_addr = dma_map_page(dev, page, page_offset, buf_len,
1045 DMA_TO_DEVICE);
1046 if (unlikely(!dma_addr)) {
1047 dev_err(netcp->ndev_dev, "Failed to map skb page\n");
1048 goto free_descs;
1049 }
1050
1051 ndesc = knav_pool_desc_get(netcp->tx_pool);
1052 if (unlikely(IS_ERR_OR_NULL(ndesc))) {
1053 dev_err(netcp->ndev_dev, "out of TX desc for frags\n");
1054 dma_unmap_page(dev, dma_addr, buf_len, DMA_TO_DEVICE);
1055 goto free_descs;
1056 }
1057
1058 desc_dma = knav_pool_desc_virt_to_dma(netcp->tx_pool,
1059 (void *)ndesc);
1060 pkt_info =
1061 (netcp->tx_compl_qid & KNAV_DMA_DESC_RETQ_MASK) <<
1062 KNAV_DMA_DESC_RETQ_SHIFT;
1063 set_pkt_info(dma_addr, buf_len, 0, ndesc);
1064 set_words(&desc_dma, 1, &pdesc->next_desc);
1065 pkt_len += buf_len;
1066 if (pdesc != desc)
1067 knav_pool_desc_map(netcp->tx_pool, pdesc,
1068 sizeof(*pdesc), &desc_dma, &dma_sz);
1069 pdesc = ndesc;
1070 }
1071 if (pdesc != desc)
1072 knav_pool_desc_map(netcp->tx_pool, pdesc, sizeof(*pdesc),
1073 &dma_addr, &dma_sz);
1074
1075 /* frag list based linkage is not supported for now. */
1076 if (skb_shinfo(skb)->frag_list) {
1077 dev_err_ratelimited(netcp->ndev_dev, "NETIF_F_FRAGLIST not supported\n");
1078 goto free_descs;
1079 }
1080
1081upd_pkt_len:
1082 WARN_ON(pkt_len != skb->len);
1083
1084 pkt_len &= KNAV_DMA_DESC_PKT_LEN_MASK;
1085 set_words(&pkt_len, 1, &desc->desc_info);
1086 return desc;
1087
1088free_descs:
1089 netcp_free_tx_desc_chain(netcp, desc, sizeof(*desc));
1090 return NULL;
1091}
1092
1093static int netcp_tx_submit_skb(struct netcp_intf *netcp,
1094 struct sk_buff *skb,
1095 struct knav_dma_desc *desc)
1096{
1097 struct netcp_tx_pipe *tx_pipe = NULL;
1098 struct netcp_hook_list *tx_hook;
1099 struct netcp_packet p_info;
84640e27
KM		 1100 unsigned int dma_sz;
1101 dma_addr_t dma;
e170f409 1102 u32 tmp = 0;
84640e27
KM		 1103 int ret = 0;
1104
1105 p_info.netcp = netcp;
1106 p_info.skb = skb;
1107 p_info.tx_pipe = NULL;
1108 p_info.psdata_len = 0;
1109 p_info.ts_context = NULL;
1110 p_info.txtstamp_complete = NULL;
1111 p_info.epib = desc->epib;
1112 p_info.psdata = desc->psdata;
1113 memset(p_info.epib, 0, KNAV_DMA_NUM_EPIB_WORDS * sizeof(u32));
1114
1115 /* Find out where to inject the packet for transmission */
1116 list_for_each_entry(tx_hook, &netcp->txhook_list_head, list) {
1117 ret = tx_hook->hook_rtn(tx_hook->order, tx_hook->hook_data,
1118 &p_info);
1119 if (unlikely(ret != 0)) {
1120 dev_err(netcp->ndev_dev, "TX hook %d rejected the packet with reason(%d)\n",
1121 tx_hook->order, ret);
1122 ret = (ret < 0) ? ret : NETDEV_TX_OK;
1123 goto out;
1124 }
1125 }
1126
1127 /* Make sure some TX hook claimed the packet */
1128 tx_pipe = p_info.tx_pipe;
1129 if (!tx_pipe) {
1130 dev_err(netcp->ndev_dev, "No TX hook claimed the packet!\n");
1131 ret = -ENXIO;
1132 goto out;
1133 }
1134
1135 /* update descriptor */
1136 if (p_info.psdata_len) {
1137 u32 *psdata = p_info.psdata;
1138
1139 memmove(p_info.psdata, p_info.psdata + p_info.psdata_len,
1140 p_info.psdata_len);
1141 set_words(psdata, p_info.psdata_len, psdata);
e170f409 1142 tmp |= (p_info.psdata_len & KNAV_DMA_DESC_PSLEN_MASK) <<
84640e27
KM		 1143 KNAV_DMA_DESC_PSLEN_SHIFT;
1144 }
1145
e170f409 1146 tmp |= KNAV_DMA_DESC_HAS_EPIB |
84640e27 1147 ((netcp->tx_compl_qid & KNAV_DMA_DESC_RETQ_MASK) <<
e170f409 1148 KNAV_DMA_DESC_RETQ_SHIFT);
84640e27 1149
e170f409
KM		 1150 if (!(tx_pipe->flags & SWITCH_TO_PORT_IN_TAGINFO)) {
1151 tmp |= ((tx_pipe->switch_to_port & KNAV_DMA_DESC_PSFLAG_MASK) <<
1152 KNAV_DMA_DESC_PSFLAG_SHIFT);
1153 }
1154
1155 set_words(&tmp, 1, &desc->packet_info);
84640e27
KM		 1156 set_words((u32 *)&skb, 1, &desc->pad[0]);
1157
e170f409
KM		 1158 if (tx_pipe->flags & SWITCH_TO_PORT_IN_TAGINFO) {
1159 tmp = tx_pipe->switch_to_port;
1160 set_words((u32 *)&tmp, 1, &desc->tag_info);
1161 }
1162
84640e27
KM		 1163 /* submit packet descriptor */
1164 ret = knav_pool_desc_map(netcp->tx_pool, desc, sizeof(*desc), &dma,
1165 &dma_sz);
1166 if (unlikely(ret)) {
1167 dev_err(netcp->ndev_dev, "%s() failed to map desc\n", __func__);
1168 ret = -ENOMEM;
1169 goto out;
1170 }
1171 skb_tx_timestamp(skb);
1172 knav_queue_push(tx_pipe->dma_queue, dma, dma_sz, 0);
1173
1174out:
1175 return ret;
1176}
1177
1178/* Submit the packet */
1179static int netcp_ndo_start_xmit(struct sk_buff *skb, struct net_device *ndev)
1180{
1181 struct netcp_intf *netcp = netdev_priv(ndev);
1182 int subqueue = skb_get_queue_mapping(skb);
1183 struct knav_dma_desc *desc;
1184 int desc_count, ret = 0;
1185
1186 if (unlikely(skb->len <= 0)) {
1187 dev_kfree_skb(skb);
1188 return NETDEV_TX_OK;
1189 }
1190
1191 if (unlikely(skb->len < NETCP_MIN_PACKET_SIZE)) {
1192 ret = skb_padto(skb, NETCP_MIN_PACKET_SIZE);
1193 if (ret < 0) {
1194 /* If we get here, the skb has already been dropped */
1195 dev_warn(netcp->ndev_dev, "padding failed (%d), packet dropped\n",
1196 ret);
1197 ndev->stats.tx_dropped++;
1198 return ret;
1199 }
1200 skb->len = NETCP_MIN_PACKET_SIZE;
1201 }
1202
1203 desc = netcp_tx_map_skb(skb, netcp);
1204 if (unlikely(!desc)) {
1205 netif_stop_subqueue(ndev, subqueue);
1206 ret = -ENOBUFS;
1207 goto drop;
1208 }
1209
1210 ret = netcp_tx_submit_skb(netcp, skb, desc);
1211 if (ret)
1212 goto drop;
1213
1214 ndev->trans_start = jiffies;
1215
1216 /* Check Tx pool count & stop subqueue if needed */
1217 desc_count = knav_pool_count(netcp->tx_pool);
1218 if (desc_count < netcp->tx_pause_threshold) {
1219 dev_dbg(netcp->ndev_dev, "pausing tx, count(%d)\n", desc_count);
1220 netif_stop_subqueue(ndev, subqueue);
1221 }
1222 return NETDEV_TX_OK;
1223
1224drop:
1225 ndev->stats.tx_dropped++;
1226 if (desc)
1227 netcp_free_tx_desc_chain(netcp, desc, sizeof(*desc));
1228 dev_kfree_skb(skb);
1229 return ret;
1230}
1231
1232int netcp_txpipe_close(struct netcp_tx_pipe *tx_pipe)
1233{
1234 if (tx_pipe->dma_channel) {
1235 knav_dma_close_channel(tx_pipe->dma_channel);
1236 tx_pipe->dma_channel = NULL;
1237 }
1238 return 0;
1239}
58c11b5f 1240EXPORT_SYMBOL_GPL(netcp_txpipe_close);
84640e27
KM		 1241
1242int netcp_txpipe_open(struct netcp_tx_pipe *tx_pipe)
1243{
1244 struct device *dev = tx_pipe->netcp_device->device;
1245 struct knav_dma_cfg config;
1246 int ret = 0;
1247 u8 name[16];
1248
1249 memset(&config, 0, sizeof(config));
1250 config.direction = DMA_MEM_TO_DEV;
1251 config.u.tx.filt_einfo = false;
1252 config.u.tx.filt_pswords = false;
1253 config.u.tx.priority = DMA_PRIO_MED_L;
1254
1255 tx_pipe->dma_channel = knav_dma_open_channel(dev,
1256 tx_pipe->dma_chan_name, &config);
1257 if (IS_ERR_OR_NULL(tx_pipe->dma_channel)) {
1258 dev_err(dev, "failed opening tx chan(%s)\n",
1259 tx_pipe->dma_chan_name);
1260 goto err;
1261 }
1262
1263 snprintf(name, sizeof(name), "tx-pipe-%s", dev_name(dev));
1264 tx_pipe->dma_queue = knav_queue_open(name, tx_pipe->dma_queue_id,
1265 KNAV_QUEUE_SHARED);
1266 if (IS_ERR(tx_pipe->dma_queue)) {
1267 dev_err(dev, "Could not open DMA queue for channel \"%s\": %d\n",
1268 name, ret);
1269 ret = PTR_ERR(tx_pipe->dma_queue);
1270 goto err;
1271 }
1272
1273 dev_dbg(dev, "opened tx pipe %s\n", name);
1274 return 0;
1275
1276err:
1277 if (!IS_ERR_OR_NULL(tx_pipe->dma_channel))
1278 knav_dma_close_channel(tx_pipe->dma_channel);
1279 tx_pipe->dma_channel = NULL;
1280 return ret;
1281}
58c11b5f 1282EXPORT_SYMBOL_GPL(netcp_txpipe_open);
84640e27
KM		 1283
1284int netcp_txpipe_init(struct netcp_tx_pipe *tx_pipe,
1285 struct netcp_device *netcp_device,
1286 const char *dma_chan_name, unsigned int dma_queue_id)
1287{
1288 memset(tx_pipe, 0, sizeof(*tx_pipe));
1289 tx_pipe->netcp_device = netcp_device;
1290 tx_pipe->dma_chan_name = dma_chan_name;
1291 tx_pipe->dma_queue_id = dma_queue_id;
1292 return 0;
1293}
58c11b5f 1294EXPORT_SYMBOL_GPL(netcp_txpipe_init);
84640e27
KM		 1295
1296static struct netcp_addr *netcp_addr_find(struct netcp_intf *netcp,
1297 const u8 *addr,
1298 enum netcp_addr_type type)
1299{
1300 struct netcp_addr *naddr;
1301
1302 list_for_each_entry(naddr, &netcp->addr_list, node) {
1303 if (naddr->type != type)
1304 continue;
1305 if (addr && memcmp(addr, naddr->addr, ETH_ALEN))
1306 continue;
1307 return naddr;
1308 }
1309
1310 return NULL;
1311}
1312
1313static struct netcp_addr *netcp_addr_add(struct netcp_intf *netcp,
1314 const u8 *addr,
1315 enum netcp_addr_type type)
1316{
1317 struct netcp_addr *naddr;
1318
1319 naddr = devm_kmalloc(netcp->dev, sizeof(*naddr), GFP_ATOMIC);
1320 if (!naddr)
1321 return NULL;
1322
1323 naddr->type = type;
1324 naddr->flags = 0;
1325 naddr->netcp = netcp;
1326 if (addr)
1327 ether_addr_copy(naddr->addr, addr);
1328 else
c7bf7169 1329 eth_zero_addr(naddr->addr);
84640e27
KM		 1330 list_add_tail(&naddr->node, &netcp->addr_list);
1331
1332 return naddr;
1333}
1334
1335static void netcp_addr_del(struct netcp_intf *netcp, struct netcp_addr *naddr)
1336{
1337 list_del(&naddr->node);
1338 devm_kfree(netcp->dev, naddr);
1339}
1340
1341static void netcp_addr_clear_mark(struct netcp_intf *netcp)
1342{
1343 struct netcp_addr *naddr;
1344
1345 list_for_each_entry(naddr, &netcp->addr_list, node)
1346 naddr->flags = 0;
1347}
1348
1349static void netcp_addr_add_mark(struct netcp_intf *netcp, const u8 *addr,
1350 enum netcp_addr_type type)
1351{
1352 struct netcp_addr *naddr;
1353
1354 naddr = netcp_addr_find(netcp, addr, type);
1355 if (naddr) {
1356 naddr->flags |= ADDR_VALID;
1357 return;
1358 }
1359
1360 naddr = netcp_addr_add(netcp, addr, type);
1361 if (!WARN_ON(!naddr))
1362 naddr->flags |= ADDR_NEW;
1363}
1364
1365static void netcp_addr_sweep_del(struct netcp_intf *netcp)
1366{
1367 struct netcp_addr *naddr, *tmp;
1368 struct netcp_intf_modpriv *priv;
1369 struct netcp_module *module;
1370 int error;
1371
1372 list_for_each_entry_safe(naddr, tmp, &netcp->addr_list, node) {
1373 if (naddr->flags & (ADDR_VALID | ADDR_NEW))
1374 continue;
1375 dev_dbg(netcp->ndev_dev, "deleting address %pM, type %x\n",
1376 naddr->addr, naddr->type);
1377 mutex_lock(&netcp_modules_lock);
1378 for_each_module(netcp, priv) {
1379 module = priv->netcp_module;
1380 if (!module->del_addr)
1381 continue;
1382 error = module->del_addr(priv->module_priv,
1383 naddr);
1384 WARN_ON(error);
1385 }
1386 mutex_unlock(&netcp_modules_lock);
1387 netcp_addr_del(netcp, naddr);
1388 }
1389}
1390
1391static void netcp_addr_sweep_add(struct netcp_intf *netcp)
1392{
1393 struct netcp_addr *naddr, *tmp;
1394 struct netcp_intf_modpriv *priv;
1395 struct netcp_module *module;
1396 int error;
1397
1398 list_for_each_entry_safe(naddr, tmp, &netcp->addr_list, node) {
1399 if (!(naddr->flags & ADDR_NEW))
1400 continue;
1401 dev_dbg(netcp->ndev_dev, "adding address %pM, type %x\n",
1402 naddr->addr, naddr->type);
1403 mutex_lock(&netcp_modules_lock);
1404 for_each_module(netcp, priv) {
1405 module = priv->netcp_module;
1406 if (!module->add_addr)
1407 continue;
1408 error = module->add_addr(priv->module_priv, naddr);
1409 WARN_ON(error);
1410 }
1411 mutex_unlock(&netcp_modules_lock);
1412 }
1413}
1414
1415static void netcp_set_rx_mode(struct net_device *ndev)
1416{
1417 struct netcp_intf *netcp = netdev_priv(ndev);
1418 struct netdev_hw_addr *ndev_addr;
1419 bool promisc;
1420
1421 promisc = (ndev->flags & IFF_PROMISC ||
1422 ndev->flags & IFF_ALLMULTI ||
1423 netdev_mc_count(ndev) > NETCP_MAX_MCAST_ADDR);
1424
1425 /* first clear all marks */
1426 netcp_addr_clear_mark(netcp);
1427
1428 /* next add new entries, mark existing ones */
1429 netcp_addr_add_mark(netcp, ndev->broadcast, ADDR_BCAST);
1430 for_each_dev_addr(ndev, ndev_addr)
1431 netcp_addr_add_mark(netcp, ndev_addr->addr, ADDR_DEV);
1432 netdev_for_each_uc_addr(ndev_addr, ndev)
1433 netcp_addr_add_mark(netcp, ndev_addr->addr, ADDR_UCAST);
1434 netdev_for_each_mc_addr(ndev_addr, ndev)
1435 netcp_addr_add_mark(netcp, ndev_addr->addr, ADDR_MCAST);
1436
1437 if (promisc)
1438 netcp_addr_add_mark(netcp, NULL, ADDR_ANY);
1439
1440 /* finally sweep and callout into modules */
1441 netcp_addr_sweep_del(netcp);
1442 netcp_addr_sweep_add(netcp);
1443}
1444
1445static void netcp_free_navigator_resources(struct netcp_intf *netcp)
1446{
1447 int i;
1448
1449 if (netcp->rx_channel) {
1450 knav_dma_close_channel(netcp->rx_channel);
1451 netcp->rx_channel = NULL;
1452 }
1453
1454 if (!IS_ERR_OR_NULL(netcp->rx_pool))
1455 netcp_rxpool_free(netcp);
1456
1457 if (!IS_ERR_OR_NULL(netcp->rx_queue)) {
1458 knav_queue_close(netcp->rx_queue);
1459 netcp->rx_queue = NULL;
1460 }
1461
1462 for (i = 0; i < KNAV_DMA_FDQ_PER_CHAN &&
1463 !IS_ERR_OR_NULL(netcp->rx_fdq[i]) ; ++i) {
1464 knav_queue_close(netcp->rx_fdq[i]);
1465 netcp->rx_fdq[i] = NULL;
1466 }
1467
1468 if (!IS_ERR_OR_NULL(netcp->tx_compl_q)) {
1469 knav_queue_close(netcp->tx_compl_q);
1470 netcp->tx_compl_q = NULL;
1471 }
1472
1473 if (!IS_ERR_OR_NULL(netcp->tx_pool)) {
1474 knav_pool_destroy(netcp->tx_pool);
1475 netcp->tx_pool = NULL;
1476 }
1477}
1478
1479static int netcp_setup_navigator_resources(struct net_device *ndev)
1480{
1481 struct netcp_intf *netcp = netdev_priv(ndev);
1482 struct knav_queue_notify_config notify_cfg;
1483 struct knav_dma_cfg config;
1484 u32 last_fdq = 0;
1485 u8 name[16];
1486 int ret;
1487 int i;
1488
1489 /* Create Rx/Tx descriptor pools */
1490 snprintf(name, sizeof(name), "rx-pool-%s", ndev->name);
1491 netcp->rx_pool = knav_pool_create(name, netcp->rx_pool_size,
1492 netcp->rx_pool_region_id);
1493 if (IS_ERR_OR_NULL(netcp->rx_pool)) {
1494 dev_err(netcp->ndev_dev, "Couldn't create rx pool\n");
1495 ret = PTR_ERR(netcp->rx_pool);
1496 goto fail;
1497 }
1498
1499 snprintf(name, sizeof(name), "tx-pool-%s", ndev->name);
1500 netcp->tx_pool = knav_pool_create(name, netcp->tx_pool_size,
1501 netcp->tx_pool_region_id);
1502 if (IS_ERR_OR_NULL(netcp->tx_pool)) {
1503 dev_err(netcp->ndev_dev, "Couldn't create tx pool\n");
1504 ret = PTR_ERR(netcp->tx_pool);
1505 goto fail;
1506 }
1507
1508 /* open Tx completion queue */
1509 snprintf(name, sizeof(name), "tx-compl-%s", ndev->name);
1510 netcp->tx_compl_q = knav_queue_open(name, netcp->tx_compl_qid, 0);
1511 if (IS_ERR_OR_NULL(netcp->tx_compl_q)) {
1512 ret = PTR_ERR(netcp->tx_compl_q);
1513 goto fail;
1514 }
1515 netcp->tx_compl_qid = knav_queue_get_id(netcp->tx_compl_q);
1516
1517 /* Set notification for Tx completion */
1518 notify_cfg.fn = netcp_tx_notify;
1519 notify_cfg.fn_arg = netcp;
1520 ret = knav_queue_device_control(netcp->tx_compl_q,
1521 KNAV_QUEUE_SET_NOTIFIER,
1522 (unsigned long)&notify_cfg);
1523 if (ret)
1524 goto fail;
1525
1526 knav_queue_disable_notify(netcp->tx_compl_q);
1527
1528 /* open Rx completion queue */
1529 snprintf(name, sizeof(name), "rx-compl-%s", ndev->name);
1530 netcp->rx_queue = knav_queue_open(name, netcp->rx_queue_id, 0);
1531 if (IS_ERR_OR_NULL(netcp->rx_queue)) {
1532 ret = PTR_ERR(netcp->rx_queue);
1533 goto fail;
1534 }
1535 netcp->rx_queue_id = knav_queue_get_id(netcp->rx_queue);
1536
1537 /* Set notification for Rx completion */
1538 notify_cfg.fn = netcp_rx_notify;
1539 notify_cfg.fn_arg = netcp;
1540 ret = knav_queue_device_control(netcp->rx_queue,
1541 KNAV_QUEUE_SET_NOTIFIER,
1542 (unsigned long)&notify_cfg);
1543 if (ret)
1544 goto fail;
1545
1546 knav_queue_disable_notify(netcp->rx_queue);
1547
1548 /* open Rx FDQs */
1549 for (i = 0; i < KNAV_DMA_FDQ_PER_CHAN &&
1550 netcp->rx_queue_depths[i] && netcp->rx_buffer_sizes[i]; ++i) {
1551 snprintf(name, sizeof(name), "rx-fdq-%s-%d", ndev->name, i);
1552 netcp->rx_fdq[i] = knav_queue_open(name, KNAV_QUEUE_GP, 0);
1553 if (IS_ERR_OR_NULL(netcp->rx_fdq[i])) {
1554 ret = PTR_ERR(netcp->rx_fdq[i]);
1555 goto fail;
1556 }
1557 }
1558
1559 memset(&config, 0, sizeof(config));
1560 config.direction = DMA_DEV_TO_MEM;
1561 config.u.rx.einfo_present = true;
1562 config.u.rx.psinfo_present = true;
1563 config.u.rx.err_mode = DMA_DROP;
1564 config.u.rx.desc_type = DMA_DESC_HOST;
1565 config.u.rx.psinfo_at_sop = false;
1566 config.u.rx.sop_offset = NETCP_SOP_OFFSET;
1567 config.u.rx.dst_q = netcp->rx_queue_id;
1568 config.u.rx.thresh = DMA_THRESH_NONE;
1569
1570 for (i = 0; i < KNAV_DMA_FDQ_PER_CHAN; ++i) {
1571 if (netcp->rx_fdq[i])
1572 last_fdq = knav_queue_get_id(netcp->rx_fdq[i]);
1573 config.u.rx.fdq[i] = last_fdq;
1574 }
1575
1576 netcp->rx_channel = knav_dma_open_channel(netcp->netcp_device->device,
1577 netcp->dma_chan_name, &config);
1578 if (IS_ERR_OR_NULL(netcp->rx_channel)) {
1579 dev_err(netcp->ndev_dev, "failed opening rx chan(%s\n",
1580 netcp->dma_chan_name);
1581 goto fail;
1582 }
1583
1584 dev_dbg(netcp->ndev_dev, "opened RX channel: %p\n", netcp->rx_channel);
1585 return 0;
1586
1587fail:
1588 netcp_free_navigator_resources(netcp);
1589 return ret;
1590}
1591
1592/* Open the device */
1593static int netcp_ndo_open(struct net_device *ndev)
1594{
1595 struct netcp_intf *netcp = netdev_priv(ndev);
1596 struct netcp_intf_modpriv *intf_modpriv;
1597 struct netcp_module *module;
1598 int ret;
1599
1600 netif_carrier_off(ndev);
1601 ret = netcp_setup_navigator_resources(ndev);
1602 if (ret) {
1603 dev_err(netcp->ndev_dev, "Failed to setup navigator resources\n");
1604 goto fail;
1605 }
1606
1607 mutex_lock(&netcp_modules_lock);
1608 for_each_module(netcp, intf_modpriv) {
1609 module = intf_modpriv->netcp_module;
1610 if (module->open) {
1611 ret = module->open(intf_modpriv->module_priv, ndev);
1612 if (ret != 0) {
1613 dev_err(netcp->ndev_dev, "module open failed\n");
1614 goto fail_open;
1615 }
1616 }
1617 }
1618 mutex_unlock(&netcp_modules_lock);
1619
84640e27
KM		 1620 napi_enable(&netcp->rx_napi);
1621 napi_enable(&netcp->tx_napi);
1622 knav_queue_enable_notify(netcp->tx_compl_q);
1623 knav_queue_enable_notify(netcp->rx_queue);
194ac06e 1624 netcp_rxpool_refill(netcp);
84640e27
KM		 1625 netif_tx_wake_all_queues(ndev);
1626 dev_dbg(netcp->ndev_dev, "netcp device %s opened\n", ndev->name);
1627 return 0;
1628
1629fail_open:
1630 for_each_module(netcp, intf_modpriv) {
1631 module = intf_modpriv->netcp_module;
1632 if (module->close)
1633 module->close(intf_modpriv->module_priv, ndev);
1634 }
1635 mutex_unlock(&netcp_modules_lock);
1636
1637fail:
1638 netcp_free_navigator_resources(netcp);
1639 return ret;
1640}
1641
1642/* Close the device */
1643static int netcp_ndo_stop(struct net_device *ndev)
1644{
1645 struct netcp_intf *netcp = netdev_priv(ndev);
1646 struct netcp_intf_modpriv *intf_modpriv;
1647 struct netcp_module *module;
1648 int err = 0;
1649
1650 netif_tx_stop_all_queues(ndev);
1651 netif_carrier_off(ndev);
1652 netcp_addr_clear_mark(netcp);
1653 netcp_addr_sweep_del(netcp);
1654 knav_queue_disable_notify(netcp->rx_queue);
1655 knav_queue_disable_notify(netcp->tx_compl_q);
1656 napi_disable(&netcp->rx_napi);
1657 napi_disable(&netcp->tx_napi);
1658
1659 mutex_lock(&netcp_modules_lock);
1660 for_each_module(netcp, intf_modpriv) {
1661 module = intf_modpriv->netcp_module;
1662 if (module->close) {
1663 err = module->close(intf_modpriv->module_priv, ndev);
1664 if (err != 0)
1665 dev_err(netcp->ndev_dev, "Close failed\n");
1666 }
1667 }
1668 mutex_unlock(&netcp_modules_lock);
1669
1670 /* Recycle Rx descriptors from completion queue */
1671 netcp_empty_rx_queue(netcp);
1672
1673 /* Recycle Tx descriptors from completion queue */
1674 netcp_process_tx_compl_packets(netcp, netcp->tx_pool_size);
1675
1676 if (knav_pool_count(netcp->tx_pool) != netcp->tx_pool_size)
1677 dev_err(netcp->ndev_dev, "Lost (%d) Tx descs\n",
1678 netcp->tx_pool_size - knav_pool_count(netcp->tx_pool));
1679
1680 netcp_free_navigator_resources(netcp);
1681 dev_dbg(netcp->ndev_dev, "netcp device %s stopped\n", ndev->name);
1682 return 0;
1683}
1684
1685static int netcp_ndo_ioctl(struct net_device *ndev,
1686 struct ifreq *req, int cmd)
1687{
1688 struct netcp_intf *netcp = netdev_priv(ndev);
1689 struct netcp_intf_modpriv *intf_modpriv;
1690 struct netcp_module *module;
1691 int ret = -1, err = -EOPNOTSUPP;
1692
1693 if (!netif_running(ndev))
1694 return -EINVAL;
1695
1696 mutex_lock(&netcp_modules_lock);
1697 for_each_module(netcp, intf_modpriv) {
1698 module = intf_modpriv->netcp_module;
1699 if (!module->ioctl)
1700 continue;
1701
1702 err = module->ioctl(intf_modpriv->module_priv, req, cmd);
1703 if ((err < 0) && (err != -EOPNOTSUPP)) {
1704 ret = err;
1705 goto out;
1706 }
1707 if (err == 0)
1708 ret = err;
1709 }
1710
1711out:
1712 mutex_unlock(&netcp_modules_lock);
1713 return (ret == 0) ? 0 : err;
1714}
1715
1716static int netcp_ndo_change_mtu(struct net_device *ndev, int new_mtu)
1717{
1718 struct netcp_intf *netcp = netdev_priv(ndev);
1719
1720 /* MTU < 68 is an error for IPv4 traffic */
1721 if ((new_mtu < 68) ||
1722 (new_mtu > (NETCP_MAX_FRAME_SIZE - ETH_HLEN - ETH_FCS_LEN))) {
1723 dev_err(netcp->ndev_dev, "Invalid mtu size = %d\n", new_mtu);
1724 return -EINVAL;
1725 }
1726
1727 ndev->mtu = new_mtu;
1728 return 0;
1729}
1730
1731static void netcp_ndo_tx_timeout(struct net_device *ndev)
1732{
1733 struct netcp_intf *netcp = netdev_priv(ndev);
1734 unsigned int descs = knav_pool_count(netcp->tx_pool);
1735
1736 dev_err(netcp->ndev_dev, "transmit timed out tx descs(%d)\n", descs);
1737 netcp_process_tx_compl_packets(netcp, netcp->tx_pool_size);
1738 ndev->trans_start = jiffies;
1739 netif_tx_wake_all_queues(ndev);
1740}
1741
1742static int netcp_rx_add_vid(struct net_device *ndev, __be16 proto, u16 vid)
1743{
1744 struct netcp_intf *netcp = netdev_priv(ndev);
1745 struct netcp_intf_modpriv *intf_modpriv;
1746 struct netcp_module *module;
1747 int err = 0;
1748
1749 dev_dbg(netcp->ndev_dev, "adding rx vlan id: %d\n", vid);
1750
1751 mutex_lock(&netcp_modules_lock);
1752 for_each_module(netcp, intf_modpriv) {
1753 module = intf_modpriv->netcp_module;
1754 if ((module->add_vid) && (vid != 0)) {
1755 err = module->add_vid(intf_modpriv->module_priv, vid);
1756 if (err != 0) {
1757 dev_err(netcp->ndev_dev, "Could not add vlan id = %d\n",
1758 vid);
1759 break;
1760 }
1761 }
1762 }
1763 mutex_unlock(&netcp_modules_lock);
1764 return err;
1765}
1766
1767static int netcp_rx_kill_vid(struct net_device *ndev, __be16 proto, u16 vid)
1768{
1769 struct netcp_intf *netcp = netdev_priv(ndev);
1770 struct netcp_intf_modpriv *intf_modpriv;
1771 struct netcp_module *module;
1772 int err = 0;
1773
1774 dev_dbg(netcp->ndev_dev, "removing rx vlan id: %d\n", vid);
1775
1776 mutex_lock(&netcp_modules_lock);
1777 for_each_module(netcp, intf_modpriv) {
1778 module = intf_modpriv->netcp_module;
1779 if (module->del_vid) {
1780 err = module->del_vid(intf_modpriv->module_priv, vid);
1781 if (err != 0) {
1782 dev_err(netcp->ndev_dev, "Could not delete vlan id = %d\n",
1783 vid);
1784 break;
1785 }
1786 }
1787 }
1788 mutex_unlock(&netcp_modules_lock);
1789 return err;
1790}
1791
1792static u16 netcp_select_queue(struct net_device *dev, struct sk_buff *skb,
1793 void *accel_priv,
1794 select_queue_fallback_t fallback)
1795{
1796 return 0;
1797}
1798
1799static int netcp_setup_tc(struct net_device *dev, u8 num_tc)
1800{
1801 int i;
1802
1803 /* setup tc must be called under rtnl lock */
1804 ASSERT_RTNL();
1805
1806 /* Sanity-check the number of traffic classes requested */
1807 if ((dev->real_num_tx_queues <= 1) ||
1808 (dev->real_num_tx_queues < num_tc))
1809 return -EINVAL;
1810
1811 /* Configure traffic class to queue mappings */
1812 if (num_tc) {
1813 netdev_set_num_tc(dev, num_tc);
1814 for (i = 0; i < num_tc; i++)
1815 netdev_set_tc_queue(dev, i, 1, i);
1816 } else {
1817 netdev_reset_tc(dev);
1818 }
1819
1820 return 0;
1821}
1822
1823static const struct net_device_ops netcp_netdev_ops = {
1824 .ndo_open = netcp_ndo_open,
1825 .ndo_stop = netcp_ndo_stop,
1826 .ndo_start_xmit = netcp_ndo_start_xmit,
1827 .ndo_set_rx_mode = netcp_set_rx_mode,
1828 .ndo_do_ioctl = netcp_ndo_ioctl,
1829 .ndo_change_mtu = netcp_ndo_change_mtu,
1830 .ndo_set_mac_address = eth_mac_addr,
1831 .ndo_validate_addr = eth_validate_addr,
1832 .ndo_vlan_rx_add_vid = netcp_rx_add_vid,
1833 .ndo_vlan_rx_kill_vid = netcp_rx_kill_vid,
1834 .ndo_tx_timeout = netcp_ndo_tx_timeout,
1835 .ndo_select_queue = netcp_select_queue,
1836 .ndo_setup_tc = netcp_setup_tc,
1837};
1838
1839static int netcp_create_interface(struct netcp_device *netcp_device,
1840 struct device_node *node_interface)
1841{
1842 struct device *dev = netcp_device->device;
1843 struct device_node *node = dev->of_node;
1844 struct netcp_intf *netcp;
1845 struct net_device *ndev;
1846 resource_size_t size;
1847 struct resource res;
1848 void __iomem *efuse = NULL;
1849 u32 efuse_mac = 0;
1850 const void *mac_addr;
1851 u8 efuse_mac_addr[6];
1852 u32 temp[2];
1853 int ret = 0;
1854
1855 ndev = alloc_etherdev_mqs(sizeof(*netcp), 1, 1);
1856 if (!ndev) {
1857 dev_err(dev, "Error allocating netdev\n");
1858 return -ENOMEM;
1859 }
1860
1861 ndev->features |= NETIF_F_SG;
1862 ndev->features |= NETIF_F_HW_VLAN_CTAG_FILTER;
1863 ndev->hw_features = ndev->features;
1864 ndev->vlan_features |= NETIF_F_SG;
1865
1866 netcp = netdev_priv(ndev);
1867 spin_lock_init(&netcp->lock);
1868 INIT_LIST_HEAD(&netcp->module_head);
1869 INIT_LIST_HEAD(&netcp->txhook_list_head);
1870 INIT_LIST_HEAD(&netcp->rxhook_list_head);
1871 INIT_LIST_HEAD(&netcp->addr_list);
1872 netcp->netcp_device = netcp_device;
1873 netcp->dev = netcp_device->device;
1874 netcp->ndev = ndev;
1875 netcp->ndev_dev = &ndev->dev;
1876 netcp->msg_enable = netif_msg_init(netcp_debug_level, NETCP_DEBUG);
1877 netcp->tx_pause_threshold = MAX_SKB_FRAGS;
1878 netcp->tx_resume_threshold = netcp->tx_pause_threshold;
1879 netcp->node_interface = node_interface;
1880
1881 ret = of_property_read_u32(node_interface, "efuse-mac", &efuse_mac);
1882 if (efuse_mac) {
1883 if (of_address_to_resource(node, NETCP_EFUSE_REG_INDEX, &res)) {
1884 dev_err(dev, "could not find efuse-mac reg resource\n");
1885 ret = -ENODEV;
1886 goto quit;
1887 }
1888 size = resource_size(&res);
1889
1890 if (!devm_request_mem_region(dev, res.start, size,
1891 dev_name(dev))) {
1892 dev_err(dev, "could not reserve resource\n");
1893 ret = -ENOMEM;
1894 goto quit;
1895 }
1896
1897 efuse = devm_ioremap_nocache(dev, res.start, size);
1898 if (!efuse) {
1899 dev_err(dev, "could not map resource\n");
1900 devm_release_mem_region(dev, res.start, size);
1901 ret = -ENOMEM;
1902 goto quit;
1903 }
1904
1905 emac_arch_get_mac_addr(efuse_mac_addr, efuse);
1906 if (is_valid_ether_addr(efuse_mac_addr))
1907 ether_addr_copy(ndev->dev_addr, efuse_mac_addr);
1908 else
1909 random_ether_addr(ndev->dev_addr);
1910
1911 devm_iounmap(dev, efuse);
1912 devm_release_mem_region(dev, res.start, size);
1913 } else {
1914 mac_addr = of_get_mac_address(node_interface);
1915 if (mac_addr)
1916 ether_addr_copy(ndev->dev_addr, mac_addr);
1917 else
1918 random_ether_addr(ndev->dev_addr);
1919 }
1920
1921 ret = of_property_read_string(node_interface, "rx-channel",
1922 &netcp->dma_chan_name);
1923 if (ret < 0) {
1924 dev_err(dev, "missing \"rx-channel\" parameter\n");
1925 ret = -ENODEV;
1926 goto quit;
1927 }
1928
1929 ret = of_property_read_u32(node_interface, "rx-queue",
1930 &netcp->rx_queue_id);
1931 if (ret < 0) {
1932 dev_warn(dev, "missing \"rx-queue\" parameter\n");
1933 netcp->rx_queue_id = KNAV_QUEUE_QPEND;
1934 }
1935
1936 ret = of_property_read_u32_array(node_interface, "rx-queue-depth",
1937 netcp->rx_queue_depths,
1938 KNAV_DMA_FDQ_PER_CHAN);
1939 if (ret < 0) {
1940 dev_err(dev, "missing \"rx-queue-depth\" parameter\n");
1941 netcp->rx_queue_depths[0] = 128;
1942 }
1943
1944 ret = of_property_read_u32_array(node_interface, "rx-buffer-size",
1945 netcp->rx_buffer_sizes,
1946 KNAV_DMA_FDQ_PER_CHAN);
1947 if (ret) {
1948 dev_err(dev, "missing \"rx-buffer-size\" parameter\n");
1949 netcp->rx_buffer_sizes[0] = 1536;
1950 }
1951
1952 ret = of_property_read_u32_array(node_interface, "rx-pool", temp, 2);
1953 if (ret < 0) {
1954 dev_err(dev, "missing \"rx-pool\" parameter\n");
1955 ret = -ENODEV;
1956 goto quit;
1957 }
1958 netcp->rx_pool_size = temp[0];
1959 netcp->rx_pool_region_id = temp[1];
1960
1961 ret = of_property_read_u32_array(node_interface, "tx-pool", temp, 2);
1962 if (ret < 0) {
1963 dev_err(dev, "missing \"tx-pool\" parameter\n");
1964 ret = -ENODEV;
1965 goto quit;
1966 }
1967 netcp->tx_pool_size = temp[0];
1968 netcp->tx_pool_region_id = temp[1];
1969
1970 if (netcp->tx_pool_size < MAX_SKB_FRAGS) {
1971 dev_err(dev, "tx-pool size too small, must be atleast(%ld)\n",
1972 MAX_SKB_FRAGS);
1973 ret = -ENODEV;
1974 goto quit;
1975 }
1976
1977 ret = of_property_read_u32(node_interface, "tx-completion-queue",
1978 &netcp->tx_compl_qid);
1979 if (ret < 0) {
1980 dev_warn(dev, "missing \"tx-completion-queue\" parameter\n");
1981 netcp->tx_compl_qid = KNAV_QUEUE_QPEND;
1982 }
1983
1984 /* NAPI register */
1985 netif_napi_add(ndev, &netcp->rx_napi, netcp_rx_poll, NETCP_NAPI_WEIGHT);
1986 netif_napi_add(ndev, &netcp->tx_napi, netcp_tx_poll, NETCP_NAPI_WEIGHT);
1987
1988 /* Register the network device */
1989 ndev->dev_id = 0;
1990 ndev->watchdog_timeo = NETCP_TX_TIMEOUT;
1991 ndev->netdev_ops = &netcp_netdev_ops;
1992 SET_NETDEV_DEV(ndev, dev);
1993
1994 list_add_tail(&netcp->interface_list, &netcp_device->interface_head);
1995 return 0;
1996
1997quit:
1998 free_netdev(ndev);
1999 return ret;
2000}
2001
2002static void netcp_delete_interface(struct netcp_device *netcp_device,
2003 struct net_device *ndev)
2004{
2005 struct netcp_intf_modpriv *intf_modpriv, *tmp;
2006 struct netcp_intf *netcp = netdev_priv(ndev);
2007 struct netcp_module *module;
2008
2009 dev_dbg(netcp_device->device, "Removing interface \"%s\"\n",
2010 ndev->name);
2011
2012 /* Notify each of the modules that the interface is going away */
2013 list_for_each_entry_safe(intf_modpriv, tmp, &netcp->module_head,
2014 intf_list) {
2015 module = intf_modpriv->netcp_module;
2016 dev_dbg(netcp_device->device, "Releasing module \"%s\"\n",
2017 module->name);
2018 if (module->release)
2019 module->release(intf_modpriv->module_priv);
2020 list_del(&intf_modpriv->intf_list);
2021 kfree(intf_modpriv);
2022 }
2023 WARN(!list_empty(&netcp->module_head), "%s interface module list is not empty!\n",
2024 ndev->name);
2025
2026 list_del(&netcp->interface_list);
2027
2028 of_node_put(netcp->node_interface);
2029 unregister_netdev(ndev);
2030 netif_napi_del(&netcp->rx_napi);
2031 free_netdev(ndev);
2032}
2033
2034static int netcp_probe(struct platform_device *pdev)
2035{
2036 struct device_node *node = pdev->dev.of_node;
2037 struct netcp_intf *netcp_intf, *netcp_tmp;
2038 struct device_node *child, *interfaces;
2039 struct netcp_device *netcp_device;
2040 struct device *dev = &pdev->dev;
2041 struct netcp_module *module;
2042 int ret;
2043
2044 if (!node) {
2045 dev_err(dev, "could not find device info\n");
2046 return -ENODEV;
2047 }
2048
2049 /* Allocate a new NETCP device instance */
2050 netcp_device = devm_kzalloc(dev, sizeof(*netcp_device), GFP_KERNEL);
2051 if (!netcp_device)
2052 return -ENOMEM;
2053
2054 pm_runtime_enable(&pdev->dev);
2055 ret = pm_runtime_get_sync(&pdev->dev);
2056 if (ret < 0) {
2057 dev_err(dev, "Failed to enable NETCP power-domain\n");
2058 pm_runtime_disable(&pdev->dev);
2059 return ret;
2060 }
2061
2062 /* Initialize the NETCP device instance */
2063 INIT_LIST_HEAD(&netcp_device->interface_head);
2064 INIT_LIST_HEAD(&netcp_device->modpriv_head);
2065 netcp_device->device = dev;
2066 platform_set_drvdata(pdev, netcp_device);
2067
2068 /* create interfaces */
2069 interfaces = of_get_child_by_name(node, "netcp-interfaces");
2070 if (!interfaces) {
2071 dev_err(dev, "could not find netcp-interfaces node\n");
2072 ret = -ENODEV;
2073 goto probe_quit;
2074 }
2075
2076 for_each_available_child_of_node(interfaces, child) {
2077 ret = netcp_create_interface(netcp_device, child);
2078 if (ret) {
2079 dev_err(dev, "could not create interface(%s)\n",
2080 child->name);
2081 goto probe_quit_interface;
2082 }
2083 }
2084
2085 /* Add the device instance to the list */
2086 list_add_tail(&netcp_device->device_list, &netcp_devices);
2087
2088 /* Probe & attach any modules already registered */
2089 mutex_lock(&netcp_modules_lock);
2090 for_each_netcp_module(module) {
2091 ret = netcp_module_probe(netcp_device, module);
2092 if (ret < 0)
2093 dev_err(dev, "module(%s) probe failed\n", module->name);
2094 }
2095 mutex_unlock(&netcp_modules_lock);
2096 return 0;
2097
2098probe_quit_interface:
2099 list_for_each_entry_safe(netcp_intf, netcp_tmp,
2100 &netcp_device->interface_head,
2101 interface_list) {
2102 netcp_delete_interface(netcp_device, netcp_intf->ndev);
2103 }
2104
2105probe_quit:
2106 pm_runtime_put_sync(&pdev->dev);
2107 pm_runtime_disable(&pdev->dev);
2108 platform_set_drvdata(pdev, NULL);
2109 return ret;
2110}
2111
2112static int netcp_remove(struct platform_device *pdev)
2113{
2114 struct netcp_device *netcp_device = platform_get_drvdata(pdev);
2115 struct netcp_inst_modpriv *inst_modpriv, *tmp;
2116 struct netcp_module *module;
2117
2118 list_for_each_entry_safe(inst_modpriv, tmp, &netcp_device->modpriv_head,
2119 inst_list) {
2120 module = inst_modpriv->netcp_module;
2121 dev_dbg(&pdev->dev, "Removing module \"%s\"\n", module->name);
2122 module->remove(netcp_device, inst_modpriv->module_priv);
2123 list_del(&inst_modpriv->inst_list);
2124 kfree(inst_modpriv);
2125 }
2126 WARN(!list_empty(&netcp_device->interface_head), "%s interface list not empty!\n",
2127 pdev->name);
2128
2129 devm_kfree(&pdev->dev, netcp_device);
2130 pm_runtime_put_sync(&pdev->dev);
2131 pm_runtime_disable(&pdev->dev);
2132 platform_set_drvdata(pdev, NULL);
2133 return 0;
2134}
2135
1156c965 2136static const struct of_device_id of_match[] = {
84640e27
KM		 2137 { .compatible = "ti,netcp-1.0", },
2138 {},
2139};
2140MODULE_DEVICE_TABLE(of, of_match);
2141
2142static struct platform_driver netcp_driver = {
2143 .driver = {
2144 .name = "netcp-1.0",
2145 .owner = THIS_MODULE,
2146 .of_match_table = of_match,
2147 },
2148 .probe = netcp_probe,
2149 .remove = netcp_remove,
2150};
2151module_platform_driver(netcp_driver);
2152
2153MODULE_LICENSE("GPL v2");
2154MODULE_DESCRIPTION("TI NETCP driver for Keystone SOCs");
2155MODULE_AUTHOR("Sandeep Nair <sandeep_n@ti.com");
Linux 6.x block layer and io_uring tree(s)