drivers/net/ethernet/hisilicon/hns/hnae.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Copyright (c) 2014-2015 Hisilicon Limited.
   4  */
   5
   6 #include <linux/dma-mapping.h>
   7 #include <linux/interrupt.h>
   8 #include <linux/of.h>
   9 #include <linux/skbuff.h>
  10 #include <linux/slab.h>
  11 #include "hnae.h"
  12
  13 #define cls_to_ae_dev(dev) container_of(dev, struct hnae_ae_dev, cls_dev)
  14
  15 static struct class *hnae_class;
  16
  17 static void
  18 hnae_list_add(spinlock_t *lock, struct list_head *node, struct list_head *head)
  19 {
  20         unsigned long flags;
  21
  22         spin_lock_irqsave(lock, flags);
  23         list_add_tail_rcu(node, head);
  24         spin_unlock_irqrestore(lock, flags);
  25 }
  26
  27 static void hnae_list_del(spinlock_t *lock, struct list_head *node)
  28 {
  29         unsigned long flags;
  30
  31         spin_lock_irqsave(lock, flags);
  32         list_del_rcu(node);
  33         spin_unlock_irqrestore(lock, flags);
  34 }
  35
  36 static int hnae_alloc_buffer(struct hnae_ring *ring, struct hnae_desc_cb *cb)
  37 {
  38         unsigned int order = hnae_page_order(ring);
  39         struct page *p = dev_alloc_pages(order);
  40
  41         if (!p)
  42                 return -ENOMEM;
  43
  44         cb->priv = p;
  45         cb->page_offset = 0;
  46         cb->reuse_flag = 0;
  47         cb->buf  = page_address(p);
  48         cb->length = hnae_page_size(ring);
  49         cb->type = DESC_TYPE_PAGE;
  50
  51         return 0;
  52 }
  53
  54 static void hnae_free_buffer(struct hnae_ring *ring, struct hnae_desc_cb *cb)
  55 {
  56         if (unlikely(!cb->priv))
  57                 return;
  58
  59         if (cb->type == DESC_TYPE_SKB)
  60                 dev_kfree_skb_any((struct sk_buff *)cb->priv);
  61         else if (unlikely(is_rx_ring(ring)))
  62                 put_page((struct page *)cb->priv);
  63
  64         cb->priv = NULL;
  65 }
  66
  67 static int hnae_map_buffer(struct hnae_ring *ring, struct hnae_desc_cb *cb)
  68 {
  69         cb->dma = dma_map_page(ring_to_dev(ring), cb->priv, 0,
  70                                cb->length, ring_to_dma_dir(ring));
  71
  72         if (dma_mapping_error(ring_to_dev(ring), cb->dma))
  73                 return -EIO;
  74
  75         return 0;
  76 }
  77
  78 static void hnae_unmap_buffer(struct hnae_ring *ring, struct hnae_desc_cb *cb)
  79 {
  80         if (cb->type == DESC_TYPE_SKB)
  81                 dma_unmap_single(ring_to_dev(ring), cb->dma, cb->length,
  82                                  ring_to_dma_dir(ring));
  83         else if (cb->length)
  84                 dma_unmap_page(ring_to_dev(ring), cb->dma, cb->length,
  85                                ring_to_dma_dir(ring));
  86 }
  87
  88 static struct hnae_buf_ops hnae_bops = {
  89         .alloc_buffer = hnae_alloc_buffer,
  90         .free_buffer = hnae_free_buffer,
  91         .map_buffer = hnae_map_buffer,
  92         .unmap_buffer = hnae_unmap_buffer,
  93 };
  94
  95 static int __ae_match(struct device *dev, const void *data)
  96 {
  97         struct hnae_ae_dev *hdev = cls_to_ae_dev(dev);
  98
  99         if (dev_of_node(hdev->dev))
 100                 return (data == &hdev->dev->of_node->fwnode);
 101         else if (is_acpi_node(hdev->dev->fwnode))
 102                 return (data == hdev->dev->fwnode);
 103
 104         dev_err(dev, "__ae_match cannot read cfg data from OF or acpi\n");
 105         return 0;
 106 }
 107
 108 static struct hnae_ae_dev *find_ae(const struct fwnode_handle *fwnode)
 109 {
 110         struct device *dev;
 111
 112         WARN_ON(!fwnode);
 113
 114         dev = class_find_device(hnae_class, NULL, fwnode, __ae_match);
 115
 116         return dev ? cls_to_ae_dev(dev) : NULL;
 117 }
 118
 119 static void hnae_free_buffers(struct hnae_ring *ring)
 120 {
 121         int i;
 122
 123         for (i = 0; i < ring->desc_num; i++)
 124                 hnae_free_buffer_detach(ring, i);
 125 }
 126
 127 /* Allocate memory for raw pkg, and map with dma */
 128 static int hnae_alloc_buffers(struct hnae_ring *ring)
 129 {
 130         int i, j, ret;
 131
 132         for (i = 0; i < ring->desc_num; i++) {
 133                 ret = hnae_alloc_buffer_attach(ring, i);
 134                 if (ret)
 135                         goto out_buffer_fail;
 136         }
 137
 138         return 0;
 139
 140 out_buffer_fail:
 141         for (j = i - 1; j >= 0; j--)
 142                 hnae_free_buffer_detach(ring, j);
 143         return ret;
 144 }
 145
 146 /* free desc along with its attached buffer */
 147 static void hnae_free_desc(struct hnae_ring *ring)
 148 {
 149         dma_unmap_single(ring_to_dev(ring), ring->desc_dma_addr,
 150                          ring->desc_num * sizeof(ring->desc[0]),
 151                          ring_to_dma_dir(ring));
 152         ring->desc_dma_addr = 0;
 153         kfree(ring->desc);
 154         ring->desc = NULL;
 155 }
 156
 157 /* alloc desc, without buffer attached */
 158 static int hnae_alloc_desc(struct hnae_ring *ring)
 159 {
 160         int size = ring->desc_num * sizeof(ring->desc[0]);
 161
 162         ring->desc = kzalloc(size, GFP_KERNEL);
 163         if (!ring->desc)
 164                 return -ENOMEM;
 165
 166         ring->desc_dma_addr = dma_map_single(ring_to_dev(ring),
 167                 ring->desc, size, ring_to_dma_dir(ring));
 168         if (dma_mapping_error(ring_to_dev(ring), ring->desc_dma_addr)) {
 169                 ring->desc_dma_addr = 0;
 170                 kfree(ring->desc);
 171                 ring->desc = NULL;
 172                 return -ENOMEM;
 173         }
 174
 175         return 0;
 176 }
 177
 178 /* fini ring, also free the buffer for the ring */
 179 static void hnae_fini_ring(struct hnae_ring *ring)
 180 {
 181         if (is_rx_ring(ring))
 182                 hnae_free_buffers(ring);
 183
 184         hnae_free_desc(ring);
 185         kfree(ring->desc_cb);
 186         ring->desc_cb = NULL;
 187         ring->next_to_clean = 0;
 188         ring->next_to_use = 0;
 189 }
 190
 191 /* init ring, and with buffer for rx ring */
 192 static int
 193 hnae_init_ring(struct hnae_queue *q, struct hnae_ring *ring, int flags)
 194 {
 195         int ret;
 196
 197         if (ring->desc_num <= 0 || ring->buf_size <= 0)
 198                 return -EINVAL;
 199
 200         ring->q = q;
 201         ring->flags = flags;
 202         ring->coal_param = q->handle->coal_param;
 203         assert(!ring->desc && !ring->desc_cb && !ring->desc_dma_addr);
 204
 205         /* not matter for tx or rx ring, the ntc and ntc start from 0 */
 206         assert(ring->next_to_use == 0);
 207         assert(ring->next_to_clean == 0);
 208
 209         ring->desc_cb = kcalloc(ring->desc_num, sizeof(ring->desc_cb[0]),
 210                         GFP_KERNEL);
 211         if (!ring->desc_cb) {
 212                 ret = -ENOMEM;
 213                 goto out;
 214         }
 215
 216         ret = hnae_alloc_desc(ring);
 217         if (ret)
 218                 goto out_with_desc_cb;
 219
 220         if (is_rx_ring(ring)) {
 221                 ret = hnae_alloc_buffers(ring);
 222                 if (ret)
 223                         goto out_with_desc;
 224         }
 225
 226         return 0;
 227
 228 out_with_desc:
 229         hnae_free_desc(ring);
 230 out_with_desc_cb:
 231         kfree(ring->desc_cb);
 232         ring->desc_cb = NULL;
 233 out:
 234         return ret;
 235 }
 236
 237 static int hnae_init_queue(struct hnae_handle *h, struct hnae_queue *q,
 238                            struct hnae_ae_dev *dev)
 239 {
 240         int ret;
 241
 242         q->dev = dev;
 243         q->handle = h;
 244
 245         ret = hnae_init_ring(q, &q->tx_ring, q->tx_ring.flags | RINGF_DIR);
 246         if (ret)
 247                 goto out;
 248
 249         ret = hnae_init_ring(q, &q->rx_ring, q->rx_ring.flags & ~RINGF_DIR);
 250         if (ret)
 251                 goto out_with_tx_ring;
 252
 253         if (dev->ops->init_queue)
 254                 dev->ops->init_queue(q);
 255
 256         return 0;
 257
 258 out_with_tx_ring:
 259         hnae_fini_ring(&q->tx_ring);
 260 out:
 261         return ret;
 262 }
 263
 264 static void hnae_fini_queue(struct hnae_queue *q)
 265 {
 266         if (q->dev->ops->fini_queue)
 267                 q->dev->ops->fini_queue(q);
 268
 269         hnae_fini_ring(&q->tx_ring);
 270         hnae_fini_ring(&q->rx_ring);
 271 }
 272
 273 /**
 274  * ae_chain - define ae chain head
 275  */
 276 static RAW_NOTIFIER_HEAD(ae_chain);
 277
 278 int hnae_register_notifier(struct notifier_block *nb)
 279 {
 280         return raw_notifier_chain_register(&ae_chain, nb);
 281 }
 282 EXPORT_SYMBOL(hnae_register_notifier);
 283
 284 void hnae_unregister_notifier(struct notifier_block *nb)
 285 {
 286         if (raw_notifier_chain_unregister(&ae_chain, nb))
 287                 dev_err(NULL, "notifier chain unregister fail\n");
 288 }
 289 EXPORT_SYMBOL(hnae_unregister_notifier);
 290
 291 int hnae_reinit_handle(struct hnae_handle *handle)
 292 {
 293         int i, j;
 294         int ret;
 295
 296         for (i = 0; i < handle->q_num; i++) /* free ring*/
 297                 hnae_fini_queue(handle->qs[i]);
 298
 299         if (handle->dev->ops->reset)
 300                 handle->dev->ops->reset(handle);
 301
 302         for (i = 0; i < handle->q_num; i++) {/* reinit ring*/
 303                 ret = hnae_init_queue(handle, handle->qs[i], handle->dev);
 304                 if (ret)
 305                         goto out_when_init_queue;
 306         }
 307         return 0;
 308 out_when_init_queue:
 309         for (j = i - 1; j >= 0; j--)
 310                 hnae_fini_queue(handle->qs[j]);
 311         return ret;
 312 }
 313 EXPORT_SYMBOL(hnae_reinit_handle);
 314
 315 /* hnae_get_handle - get a handle from the AE
 316  * @owner_dev: the dev use this handle
 317  * @ae_id: the id of the ae to be used
 318  * @ae_opts: the options set for the handle
 319  * @bops: the callbacks for buffer management
 320  *
 321  * return handle ptr or ERR_PTR
 322  */
 323 struct hnae_handle *hnae_get_handle(struct device *owner_dev,
 324                                     const struct fwnode_handle  *fwnode,
 325                                     u32 port_id,
 326                                     struct hnae_buf_ops *bops)
 327 {
 328         struct hnae_ae_dev *dev;
 329         struct hnae_handle *handle;
 330         int i, j;
 331         int ret;
 332
 333         dev = find_ae(fwnode);
 334         if (!dev)
 335                 return ERR_PTR(-ENODEV);
 336
 337         handle = dev->ops->get_handle(dev, port_id);
 338         if (IS_ERR(handle)) {
 339                 put_device(&dev->cls_dev);
 340                 return handle;
 341         }
 342
 343         handle->dev = dev;
 344         handle->owner_dev = owner_dev;
 345         handle->bops = bops ? bops : &hnae_bops;
 346         handle->eport_id = port_id;
 347
 348         for (i = 0; i < handle->q_num; i++) {
 349                 ret = hnae_init_queue(handle, handle->qs[i], dev);
 350                 if (ret)
 351                         goto out_when_init_queue;
 352         }
 353
 354         __module_get(dev->owner);
 355
 356         hnae_list_add(&dev->lock, &handle->node, &dev->handle_list);
 357
 358         return handle;
 359
 360 out_when_init_queue:
 361         for (j = i - 1; j >= 0; j--)
 362                 hnae_fini_queue(handle->qs[j]);
 363
 364         put_device(&dev->cls_dev);
 365
 366         return ERR_PTR(-ENOMEM);
 367 }
 368 EXPORT_SYMBOL(hnae_get_handle);
 369
 370 void hnae_put_handle(struct hnae_handle *h)
 371 {
 372         struct hnae_ae_dev *dev = h->dev;
 373         int i;
 374
 375         for (i = 0; i < h->q_num; i++)
 376                 hnae_fini_queue(h->qs[i]);
 377
 378         if (h->dev->ops->reset)
 379                 h->dev->ops->reset(h);
 380
 381         hnae_list_del(&dev->lock, &h->node);
 382
 383         if (dev->ops->put_handle)
 384                 dev->ops->put_handle(h);
 385
 386         module_put(dev->owner);
 387
 388         put_device(&dev->cls_dev);
 389 }
 390 EXPORT_SYMBOL(hnae_put_handle);
 391
 392 static void hnae_release(struct device *dev)
 393 {
 394 }
 395
 396 /**
 397  * hnae_ae_register - register a AE engine to hnae framework
 398  * @hdev: the hnae ae engine device
 399  * @owner:  the module who provides this dev
 400  * NOTE: the duplicated name will not be checked
 401  */
 402 int hnae_ae_register(struct hnae_ae_dev *hdev, struct module *owner)
 403 {
 404         static atomic_t id = ATOMIC_INIT(-1);
 405         int ret;
 406
 407         if (!hdev->dev)
 408                 return -ENODEV;
 409
 410         if (!hdev->ops || !hdev->ops->get_handle ||
 411             !hdev->ops->toggle_ring_irq ||
 412             !hdev->ops->get_status || !hdev->ops->adjust_link)
 413                 return -EINVAL;
 414
 415         hdev->owner = owner;
 416         hdev->id = (int)atomic_inc_return(&id);
 417         hdev->cls_dev.parent = hdev->dev;
 418         hdev->cls_dev.class = hnae_class;
 419         hdev->cls_dev.release = hnae_release;
 420         (void)dev_set_name(&hdev->cls_dev, "hnae%d", hdev->id);
 421         ret = device_register(&hdev->cls_dev);
 422         if (ret)
 423                 return ret;
 424
 425         __module_get(THIS_MODULE);
 426
 427         INIT_LIST_HEAD(&hdev->handle_list);
 428         spin_lock_init(&hdev->lock);
 429
 430         ret = raw_notifier_call_chain(&ae_chain, HNAE_AE_REGISTER, NULL);
 431         if (ret)
 432                 dev_dbg(hdev->dev,
 433                         "has not notifier for AE: %s\n", hdev->name);
 434
 435         return 0;
 436 }
 437 EXPORT_SYMBOL(hnae_ae_register);
 438
 439 /**
 440  * hnae_ae_unregister - unregisters a HNAE AE engine
 441  * @cdev: the device to unregister
 442  */
 443 void hnae_ae_unregister(struct hnae_ae_dev *hdev)
 444 {
 445         device_unregister(&hdev->cls_dev);
 446         module_put(THIS_MODULE);
 447 }
 448 EXPORT_SYMBOL(hnae_ae_unregister);
 449
 450 static int __init hnae_init(void)
 451 {
 452         hnae_class = class_create(THIS_MODULE, "hnae");
 453         return PTR_ERR_OR_ZERO(hnae_class);
 454 }
 455
 456 static void __exit hnae_exit(void)
 457 {
 458         class_destroy(hnae_class);
 459 }
 460
 461 subsys_initcall(hnae_init);
 462 module_exit(hnae_exit);
 463
 464 MODULE_AUTHOR("Hisilicon, Inc.");
 465 MODULE_LICENSE("GPL");
 466 MODULE_DESCRIPTION("Hisilicon Network Acceleration Engine Framework");
 467
 468 /* vi: set tw=78 noet: */