]>
git.proxmox.com Git - mirror_ubuntu-disco-kernel.git/blob - drivers/net/ethernet/hisilicon/hns/hnae.c
2 * Copyright (c) 2014-2015 Hisilicon Limited.
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.
10 #include <linux/dma-mapping.h>
11 #include <linux/interrupt.h>
12 #include <linux/skbuff.h>
13 #include <linux/slab.h>
17 #define cls_to_ae_dev(dev) container_of(dev, struct hnae_ae_dev, cls_dev)
19 static struct class *hnae_class
;
22 hnae_list_add(spinlock_t
*lock
, struct list_head
*node
, struct list_head
*head
)
26 spin_lock_irqsave(lock
, flags
);
27 list_add_tail_rcu(node
, head
);
28 spin_unlock_irqrestore(lock
, flags
);
31 static void hnae_list_del(spinlock_t
*lock
, struct list_head
*node
)
35 spin_lock_irqsave(lock
, flags
);
37 spin_unlock_irqrestore(lock
, flags
);
40 static int hnae_alloc_buffer(struct hnae_ring
*ring
, struct hnae_desc_cb
*cb
)
42 unsigned int order
= hnae_page_order(ring
);
43 struct page
*p
= dev_alloc_pages(order
);
51 cb
->buf
= page_address(p
);
52 cb
->length
= hnae_page_size(ring
);
53 cb
->type
= DESC_TYPE_PAGE
;
58 static void hnae_free_buffer(struct hnae_ring
*ring
, struct hnae_desc_cb
*cb
)
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
));
67 static int hnae_map_buffer(struct hnae_ring
*ring
, struct hnae_desc_cb
*cb
)
69 cb
->dma
= dma_map_page(ring_to_dev(ring
), cb
->priv
, 0,
70 cb
->length
, ring_to_dma_dir(ring
));
72 if (dma_mapping_error(ring_to_dev(ring
), cb
->dma
))
78 static void hnae_unmap_buffer(struct hnae_ring
*ring
, struct hnae_desc_cb
*cb
)
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
));
84 dma_unmap_page(ring_to_dev(ring
), cb
->dma
, cb
->length
,
85 ring_to_dma_dir(ring
));
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
,
95 static int __ae_match(struct device
*dev
, const void *data
)
97 struct hnae_ae_dev
*hdev
= cls_to_ae_dev(dev
);
98 const char *ae_id
= data
;
100 if (!strncmp(ae_id
, hdev
->name
, AE_NAME_SIZE
))
106 static struct hnae_ae_dev
*find_ae(const char *ae_id
)
112 dev
= class_find_device(hnae_class
, NULL
, ae_id
, __ae_match
);
114 return dev
? cls_to_ae_dev(dev
) : NULL
;
117 static void hnae_free_buffers(struct hnae_ring
*ring
)
121 for (i
= 0; i
< ring
->desc_num
; i
++)
122 hnae_free_buffer_detach(ring
, i
);
125 /* Allocate memory for raw pkg, and map with dma */
126 static int hnae_alloc_buffers(struct hnae_ring
*ring
)
130 for (i
= 0; i
< ring
->desc_num
; i
++) {
131 ret
= hnae_alloc_buffer_attach(ring
, i
);
133 goto out_buffer_fail
;
139 for (j
= i
- 1; j
>= 0; j
--)
140 hnae_free_buffer_detach(ring
, j
);
144 /* free desc along with its attached buffer */
145 static void hnae_free_desc(struct hnae_ring
*ring
)
147 hnae_free_buffers(ring
);
148 dma_unmap_single(ring_to_dev(ring
), ring
->desc_dma_addr
,
149 ring
->desc_num
* sizeof(ring
->desc
[0]),
150 ring_to_dma_dir(ring
));
151 ring
->desc_dma_addr
= 0;
156 /* alloc desc, without buffer attached */
157 static int hnae_alloc_desc(struct hnae_ring
*ring
)
159 int size
= ring
->desc_num
* sizeof(ring
->desc
[0]);
161 ring
->desc
= kzalloc(size
, GFP_KERNEL
);
165 ring
->desc_dma_addr
= dma_map_single(ring_to_dev(ring
),
166 ring
->desc
, size
, ring_to_dma_dir(ring
));
167 if (dma_mapping_error(ring_to_dev(ring
), ring
->desc_dma_addr
)) {
168 ring
->desc_dma_addr
= 0;
177 /* fini ring, also free the buffer for the ring */
178 static void hnae_fini_ring(struct hnae_ring
*ring
)
180 hnae_free_desc(ring
);
181 kfree(ring
->desc_cb
);
182 ring
->desc_cb
= NULL
;
183 ring
->next_to_clean
= 0;
184 ring
->next_to_use
= 0;
187 /* init ring, and with buffer for rx ring */
189 hnae_init_ring(struct hnae_queue
*q
, struct hnae_ring
*ring
, int flags
)
193 if (ring
->desc_num
<= 0 || ring
->buf_size
<= 0)
198 assert(!ring
->desc
&& !ring
->desc_cb
&& !ring
->desc_dma_addr
);
200 /* not matter for tx or rx ring, the ntc and ntc start from 0 */
201 assert(ring
->next_to_use
== 0);
202 assert(ring
->next_to_clean
== 0);
204 ring
->desc_cb
= kcalloc(ring
->desc_num
, sizeof(ring
->desc_cb
[0]),
206 if (!ring
->desc_cb
) {
211 ret
= hnae_alloc_desc(ring
);
213 goto out_with_desc_cb
;
215 if (is_rx_ring(ring
)) {
216 ret
= hnae_alloc_buffers(ring
);
224 hnae_free_desc(ring
);
226 kfree(ring
->desc_cb
);
227 ring
->desc_cb
= NULL
;
232 static int hnae_init_queue(struct hnae_handle
*h
, struct hnae_queue
*q
,
233 struct hnae_ae_dev
*dev
)
240 ret
= hnae_init_ring(q
, &q
->tx_ring
, q
->tx_ring
.flags
| RINGF_DIR
);
244 ret
= hnae_init_ring(q
, &q
->rx_ring
, q
->rx_ring
.flags
& ~RINGF_DIR
);
246 goto out_with_tx_ring
;
248 if (dev
->ops
->init_queue
)
249 dev
->ops
->init_queue(q
);
254 hnae_fini_ring(&q
->tx_ring
);
259 static void hnae_fini_queue(struct hnae_queue
*q
)
261 if (q
->dev
->ops
->fini_queue
)
262 q
->dev
->ops
->fini_queue(q
);
264 hnae_fini_ring(&q
->tx_ring
);
265 hnae_fini_ring(&q
->rx_ring
);
269 * ae_chain - define ae chain head
271 static RAW_NOTIFIER_HEAD(ae_chain
);
273 int hnae_register_notifier(struct notifier_block
*nb
)
275 return raw_notifier_chain_register(&ae_chain
, nb
);
277 EXPORT_SYMBOL(hnae_register_notifier
);
279 void hnae_unregister_notifier(struct notifier_block
*nb
)
281 if (raw_notifier_chain_unregister(&ae_chain
, nb
))
282 dev_err(NULL
, "notifier chain unregister fail\n");
284 EXPORT_SYMBOL(hnae_unregister_notifier
);
286 int hnae_reinit_handle(struct hnae_handle
*handle
)
291 for (i
= 0; i
< handle
->q_num
; i
++) /* free ring*/
292 hnae_fini_queue(handle
->qs
[i
]);
294 if (handle
->dev
->ops
->reset
)
295 handle
->dev
->ops
->reset(handle
);
297 for (i
= 0; i
< handle
->q_num
; i
++) {/* reinit ring*/
298 ret
= hnae_init_queue(handle
, handle
->qs
[i
], handle
->dev
);
300 goto out_when_init_queue
;
304 for (j
= i
- 1; j
>= 0; j
--)
305 hnae_fini_queue(handle
->qs
[j
]);
308 EXPORT_SYMBOL(hnae_reinit_handle
);
310 /* hnae_get_handle - get a handle from the AE
311 * @owner_dev: the dev use this handle
312 * @ae_id: the id of the ae to be used
313 * @ae_opts: the options set for the handle
314 * @bops: the callbacks for buffer management
316 * return handle ptr or ERR_PTR
318 struct hnae_handle
*hnae_get_handle(struct device
*owner_dev
,
319 const char *ae_id
, u32 port_id
,
320 struct hnae_buf_ops
*bops
)
322 struct hnae_ae_dev
*dev
;
323 struct hnae_handle
*handle
;
327 dev
= find_ae(ae_id
);
329 return ERR_PTR(-ENODEV
);
331 handle
= dev
->ops
->get_handle(dev
, port_id
);
336 handle
->owner_dev
= owner_dev
;
337 handle
->bops
= bops
? bops
: &hnae_bops
;
338 handle
->eport_id
= port_id
;
340 for (i
= 0; i
< handle
->q_num
; i
++) {
341 ret
= hnae_init_queue(handle
, handle
->qs
[i
], dev
);
343 goto out_when_init_queue
;
346 __module_get(dev
->owner
);
348 hnae_list_add(&dev
->lock
, &handle
->node
, &dev
->handle_list
);
353 for (j
= i
- 1; j
>= 0; j
--)
354 hnae_fini_queue(handle
->qs
[j
]);
356 return ERR_PTR(-ENOMEM
);
358 EXPORT_SYMBOL(hnae_get_handle
);
360 void hnae_put_handle(struct hnae_handle
*h
)
362 struct hnae_ae_dev
*dev
= h
->dev
;
365 for (i
= 0; i
< h
->q_num
; i
++)
366 hnae_fini_queue(h
->qs
[i
]);
368 if (h
->dev
->ops
->reset
)
369 h
->dev
->ops
->reset(h
);
371 hnae_list_del(&dev
->lock
, &h
->node
);
373 if (dev
->ops
->put_handle
)
374 dev
->ops
->put_handle(h
);
376 module_put(dev
->owner
);
378 EXPORT_SYMBOL(hnae_put_handle
);
380 static void hnae_release(struct device
*dev
)
385 * hnae_ae_register - register a AE engine to hnae framework
386 * @hdev: the hnae ae engine device
387 * @owner: the module who provides this dev
388 * NOTE: the duplicated name will not be checked
390 int hnae_ae_register(struct hnae_ae_dev
*hdev
, struct module
*owner
)
392 static atomic_t id
= ATOMIC_INIT(-1);
398 if (!hdev
->ops
|| !hdev
->ops
->get_handle
||
399 !hdev
->ops
->toggle_ring_irq
||
400 !hdev
->ops
->toggle_queue_status
||
401 !hdev
->ops
->get_status
|| !hdev
->ops
->adjust_link
)
405 hdev
->id
= (int)atomic_inc_return(&id
);
406 hdev
->cls_dev
.parent
= hdev
->dev
;
407 hdev
->cls_dev
.class = hnae_class
;
408 hdev
->cls_dev
.release
= hnae_release
;
409 (void)dev_set_name(&hdev
->cls_dev
, "hnae%d", hdev
->id
);
410 ret
= device_register(&hdev
->cls_dev
);
414 __module_get(THIS_MODULE
);
416 INIT_LIST_HEAD(&hdev
->handle_list
);
417 spin_lock_init(&hdev
->lock
);
419 ret
= raw_notifier_call_chain(&ae_chain
, HNAE_AE_REGISTER
, NULL
);
422 "has not notifier for AE: %s\n", hdev
->name
);
426 EXPORT_SYMBOL(hnae_ae_register
);
429 * hnae_ae_unregister - unregisters a HNAE AE engine
430 * @cdev: the device to unregister
432 void hnae_ae_unregister(struct hnae_ae_dev
*hdev
)
434 device_unregister(&hdev
->cls_dev
);
435 module_put(THIS_MODULE
);
437 EXPORT_SYMBOL(hnae_ae_unregister
);
439 static int __init
hnae_init(void)
441 hnae_class
= class_create(THIS_MODULE
, "hnae");
442 return PTR_ERR_OR_ZERO(hnae_class
);
445 static void __exit
hnae_exit(void)
447 class_destroy(hnae_class
);
450 subsys_initcall(hnae_init
);
451 module_exit(hnae_exit
);
453 MODULE_AUTHOR("Hisilicon, Inc.");
454 MODULE_LICENSE("GPL");
455 MODULE_DESCRIPTION("Hisilicon Network Acceleration Engine Framework");
457 /* vi: set tw=78 noet: */