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git.proxmox.com Git - mirror_ubuntu-zesty-kernel.git/blob - drivers/net/ethernet/hisilicon/hns/hnae.c
78af663578868eae3a1adf7b6a997e4d3552a6e1
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
);
66 static int hnae_map_buffer(struct hnae_ring
*ring
, struct hnae_desc_cb
*cb
)
68 cb
->dma
= dma_map_page(ring_to_dev(ring
), cb
->priv
, 0,
69 cb
->length
, ring_to_dma_dir(ring
));
71 if (dma_mapping_error(ring_to_dev(ring
), cb
->dma
))
77 static void hnae_unmap_buffer(struct hnae_ring
*ring
, struct hnae_desc_cb
*cb
)
79 if (cb
->type
== DESC_TYPE_SKB
)
80 dma_unmap_single(ring_to_dev(ring
), cb
->dma
, cb
->length
,
81 ring_to_dma_dir(ring
));
83 dma_unmap_page(ring_to_dev(ring
), cb
->dma
, cb
->length
,
84 ring_to_dma_dir(ring
));
87 static struct hnae_buf_ops hnae_bops
= {
88 .alloc_buffer
= hnae_alloc_buffer
,
89 .free_buffer
= hnae_free_buffer
,
90 .map_buffer
= hnae_map_buffer
,
91 .unmap_buffer
= hnae_unmap_buffer
,
94 static int __ae_match(struct device
*dev
, const void *data
)
96 struct hnae_ae_dev
*hdev
= cls_to_ae_dev(dev
);
98 if (dev_of_node(hdev
->dev
))
99 return (data
== &hdev
->dev
->of_node
->fwnode
);
100 else if (is_acpi_node(hdev
->dev
->fwnode
))
101 return (data
== hdev
->dev
->fwnode
);
103 dev_err(dev
, "__ae_match cannot read cfg data from OF or acpi\n");
107 static struct hnae_ae_dev
*find_ae(const struct fwnode_handle
*fwnode
)
113 dev
= class_find_device(hnae_class
, NULL
, fwnode
, __ae_match
);
115 return dev
? cls_to_ae_dev(dev
) : NULL
;
118 static void hnae_free_buffers(struct hnae_ring
*ring
)
122 for (i
= 0; i
< ring
->desc_num
; i
++)
123 hnae_free_buffer_detach(ring
, i
);
126 /* Allocate memory for raw pkg, and map with dma */
127 static int hnae_alloc_buffers(struct hnae_ring
*ring
)
131 for (i
= 0; i
< ring
->desc_num
; i
++) {
132 ret
= hnae_alloc_buffer_attach(ring
, i
);
134 goto out_buffer_fail
;
140 for (j
= i
- 1; j
>= 0; j
--)
141 hnae_free_buffer_detach(ring
, j
);
145 /* free desc along with its attached buffer */
146 static void hnae_free_desc(struct hnae_ring
*ring
)
148 hnae_free_buffers(ring
);
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;
157 /* alloc desc, without buffer attached */
158 static int hnae_alloc_desc(struct hnae_ring
*ring
)
160 int size
= ring
->desc_num
* sizeof(ring
->desc
[0]);
162 ring
->desc
= kzalloc(size
, GFP_KERNEL
);
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;
178 /* fini ring, also free the buffer for the ring */
179 static void hnae_fini_ring(struct hnae_ring
*ring
)
181 hnae_free_desc(ring
);
182 kfree(ring
->desc_cb
);
183 ring
->desc_cb
= NULL
;
184 ring
->next_to_clean
= 0;
185 ring
->next_to_use
= 0;
188 /* init ring, and with buffer for rx ring */
190 hnae_init_ring(struct hnae_queue
*q
, struct hnae_ring
*ring
, int flags
)
194 if (ring
->desc_num
<= 0 || ring
->buf_size
<= 0)
199 assert(!ring
->desc
&& !ring
->desc_cb
&& !ring
->desc_dma_addr
);
201 /* not matter for tx or rx ring, the ntc and ntc start from 0 */
202 assert(ring
->next_to_use
== 0);
203 assert(ring
->next_to_clean
== 0);
205 ring
->desc_cb
= kcalloc(ring
->desc_num
, sizeof(ring
->desc_cb
[0]),
207 if (!ring
->desc_cb
) {
212 ret
= hnae_alloc_desc(ring
);
214 goto out_with_desc_cb
;
216 if (is_rx_ring(ring
)) {
217 ret
= hnae_alloc_buffers(ring
);
225 hnae_free_desc(ring
);
227 kfree(ring
->desc_cb
);
228 ring
->desc_cb
= NULL
;
233 static int hnae_init_queue(struct hnae_handle
*h
, struct hnae_queue
*q
,
234 struct hnae_ae_dev
*dev
)
241 ret
= hnae_init_ring(q
, &q
->tx_ring
, q
->tx_ring
.flags
| RINGF_DIR
);
245 ret
= hnae_init_ring(q
, &q
->rx_ring
, q
->rx_ring
.flags
& ~RINGF_DIR
);
247 goto out_with_tx_ring
;
249 if (dev
->ops
->init_queue
)
250 dev
->ops
->init_queue(q
);
255 hnae_fini_ring(&q
->tx_ring
);
260 static void hnae_fini_queue(struct hnae_queue
*q
)
262 if (q
->dev
->ops
->fini_queue
)
263 q
->dev
->ops
->fini_queue(q
);
265 hnae_fini_ring(&q
->tx_ring
);
266 hnae_fini_ring(&q
->rx_ring
);
270 * ae_chain - define ae chain head
272 static RAW_NOTIFIER_HEAD(ae_chain
);
274 int hnae_register_notifier(struct notifier_block
*nb
)
276 return raw_notifier_chain_register(&ae_chain
, nb
);
278 EXPORT_SYMBOL(hnae_register_notifier
);
280 void hnae_unregister_notifier(struct notifier_block
*nb
)
282 if (raw_notifier_chain_unregister(&ae_chain
, nb
))
283 dev_err(NULL
, "notifier chain unregister fail\n");
285 EXPORT_SYMBOL(hnae_unregister_notifier
);
287 int hnae_reinit_handle(struct hnae_handle
*handle
)
292 for (i
= 0; i
< handle
->q_num
; i
++) /* free ring*/
293 hnae_fini_queue(handle
->qs
[i
]);
295 if (handle
->dev
->ops
->reset
)
296 handle
->dev
->ops
->reset(handle
);
298 for (i
= 0; i
< handle
->q_num
; i
++) {/* reinit ring*/
299 ret
= hnae_init_queue(handle
, handle
->qs
[i
], handle
->dev
);
301 goto out_when_init_queue
;
305 for (j
= i
- 1; j
>= 0; j
--)
306 hnae_fini_queue(handle
->qs
[j
]);
309 EXPORT_SYMBOL(hnae_reinit_handle
);
311 /* hnae_get_handle - get a handle from the AE
312 * @owner_dev: the dev use this handle
313 * @ae_id: the id of the ae to be used
314 * @ae_opts: the options set for the handle
315 * @bops: the callbacks for buffer management
317 * return handle ptr or ERR_PTR
319 struct hnae_handle
*hnae_get_handle(struct device
*owner_dev
,
320 const struct fwnode_handle
*fwnode
,
322 struct hnae_buf_ops
*bops
)
324 struct hnae_ae_dev
*dev
;
325 struct hnae_handle
*handle
;
329 dev
= find_ae(fwnode
);
331 return ERR_PTR(-ENODEV
);
333 handle
= dev
->ops
->get_handle(dev
, port_id
);
334 if (IS_ERR(handle
)) {
335 put_device(&dev
->cls_dev
);
340 handle
->owner_dev
= owner_dev
;
341 handle
->bops
= bops
? bops
: &hnae_bops
;
342 handle
->eport_id
= port_id
;
344 for (i
= 0; i
< handle
->q_num
; i
++) {
345 ret
= hnae_init_queue(handle
, handle
->qs
[i
], dev
);
347 goto out_when_init_queue
;
350 __module_get(dev
->owner
);
352 hnae_list_add(&dev
->lock
, &handle
->node
, &dev
->handle_list
);
357 for (j
= i
- 1; j
>= 0; j
--)
358 hnae_fini_queue(handle
->qs
[j
]);
360 put_device(&dev
->cls_dev
);
362 return ERR_PTR(-ENOMEM
);
364 EXPORT_SYMBOL(hnae_get_handle
);
366 void hnae_put_handle(struct hnae_handle
*h
)
368 struct hnae_ae_dev
*dev
= h
->dev
;
371 for (i
= 0; i
< h
->q_num
; i
++)
372 hnae_fini_queue(h
->qs
[i
]);
374 if (h
->dev
->ops
->reset
)
375 h
->dev
->ops
->reset(h
);
377 hnae_list_del(&dev
->lock
, &h
->node
);
379 if (dev
->ops
->put_handle
)
380 dev
->ops
->put_handle(h
);
382 module_put(dev
->owner
);
384 put_device(&dev
->cls_dev
);
386 EXPORT_SYMBOL(hnae_put_handle
);
388 static void hnae_release(struct device
*dev
)
393 * hnae_ae_register - register a AE engine to hnae framework
394 * @hdev: the hnae ae engine device
395 * @owner: the module who provides this dev
396 * NOTE: the duplicated name will not be checked
398 int hnae_ae_register(struct hnae_ae_dev
*hdev
, struct module
*owner
)
400 static atomic_t id
= ATOMIC_INIT(-1);
406 if (!hdev
->ops
|| !hdev
->ops
->get_handle
||
407 !hdev
->ops
->toggle_ring_irq
||
408 !hdev
->ops
->get_status
|| !hdev
->ops
->adjust_link
)
412 hdev
->id
= (int)atomic_inc_return(&id
);
413 hdev
->cls_dev
.parent
= hdev
->dev
;
414 hdev
->cls_dev
.class = hnae_class
;
415 hdev
->cls_dev
.release
= hnae_release
;
416 (void)dev_set_name(&hdev
->cls_dev
, "hnae%d", hdev
->id
);
417 ret
= device_register(&hdev
->cls_dev
);
421 __module_get(THIS_MODULE
);
423 INIT_LIST_HEAD(&hdev
->handle_list
);
424 spin_lock_init(&hdev
->lock
);
426 ret
= raw_notifier_call_chain(&ae_chain
, HNAE_AE_REGISTER
, NULL
);
429 "has not notifier for AE: %s\n", hdev
->name
);
433 EXPORT_SYMBOL(hnae_ae_register
);
436 * hnae_ae_unregister - unregisters a HNAE AE engine
437 * @cdev: the device to unregister
439 void hnae_ae_unregister(struct hnae_ae_dev
*hdev
)
441 device_unregister(&hdev
->cls_dev
);
442 module_put(THIS_MODULE
);
444 EXPORT_SYMBOL(hnae_ae_unregister
);
446 static int __init
hnae_init(void)
448 hnae_class
= class_create(THIS_MODULE
, "hnae");
449 return PTR_ERR_OR_ZERO(hnae_class
);
452 static void __exit
hnae_exit(void)
454 class_destroy(hnae_class
);
457 subsys_initcall(hnae_init
);
458 module_exit(hnae_exit
);
460 MODULE_AUTHOR("Hisilicon, Inc.");
461 MODULE_LICENSE("GPL");
462 MODULE_DESCRIPTION("Hisilicon Network Acceleration Engine Framework");
464 /* vi: set tw=78 noet: */