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

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