[mirror_ubuntu-zesty-kernel.git] / drivers / net / ethernet / hisilicon / hns / hnae.c

/*
 * Copyright (c) 2014-2015 Hisilicon Limited.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */

#include <linux/dma-mapping.h>
#include <linux/interrupt.h>
#include <linux/skbuff.h>
#include <linux/slab.h>

#include "hnae.h"

#define cls_to_ae_dev(dev) container_of(dev, struct hnae_ae_dev, cls_dev)

static struct class *hnae_class;

static void
hnae_list_add(spinlock_t *lock, struct list_head *node, struct list_head *head)
{
	unsigned long flags;

	spin_lock_irqsave(lock, flags);
	list_add_tail_rcu(node, head);
	spin_unlock_irqrestore(lock, flags);
}

static void hnae_list_del(spinlock_t *lock, struct list_head *node)
{
	unsigned long flags;

	spin_lock_irqsave(lock, flags);
	list_del_rcu(node);
	spin_unlock_irqrestore(lock, flags);
}

static int hnae_alloc_buffer(struct hnae_ring *ring, struct hnae_desc_cb *cb)
{
	unsigned int order = hnae_page_order(ring);
	struct page *p = dev_alloc_pages(order);

	if (!p)
		return -ENOMEM;

	cb->priv = p;
	cb->page_offset = 0;
	cb->reuse_flag = 0;
	cb->buf  = page_address(p);
	cb->length = hnae_page_size(ring);
	cb->type = DESC_TYPE_PAGE;

	return 0;
}

static void hnae_free_buffer(struct hnae_ring *ring, struct hnae_desc_cb *cb)
{
	if (unlikely(!cb->priv))
		return;

	if (cb->type == DESC_TYPE_SKB)
		dev_kfree_skb_any((struct sk_buff *)cb->priv);
	else if (unlikely(is_rx_ring(ring)))
		put_page((struct page *)cb->priv);

	cb->priv = NULL;
}

static int hnae_map_buffer(struct hnae_ring *ring, struct hnae_desc_cb *cb)
{
	cb->dma = dma_map_page(ring_to_dev(ring), cb->priv, 0,
			       cb->length, ring_to_dma_dir(ring));

	if (dma_mapping_error(ring_to_dev(ring), cb->dma))
		return -EIO;

	return 0;
}

static void hnae_unmap_buffer(struct hnae_ring *ring, struct hnae_desc_cb *cb)
{
	if (cb->type == DESC_TYPE_SKB)
		dma_unmap_single(ring_to_dev(ring), cb->dma, cb->length,
				 ring_to_dma_dir(ring));
	else
		dma_unmap_page(ring_to_dev(ring), cb->dma, cb->length,
			       ring_to_dma_dir(ring));
}

static struct hnae_buf_ops hnae_bops = {
	.alloc_buffer = hnae_alloc_buffer,
	.free_buffer = hnae_free_buffer,
	.map_buffer = hnae_map_buffer,
	.unmap_buffer = hnae_unmap_buffer,
};

static int __ae_match(struct device *dev, const void *data)
{
	struct hnae_ae_dev *hdev = cls_to_ae_dev(dev);

	if (dev_of_node(hdev->dev))
		return (data == &hdev->dev->of_node->fwnode);
	else if (is_acpi_node(hdev->dev->fwnode))
		return (data == hdev->dev->fwnode);

	dev_err(dev, "__ae_match cannot read cfg data from OF or acpi\n");
	return 0;
}

static struct hnae_ae_dev *find_ae(const struct fwnode_handle *fwnode)
{
	struct device *dev;

	WARN_ON(!fwnode);

	dev = class_find_device(hnae_class, NULL, fwnode, __ae_match);

	return dev ? cls_to_ae_dev(dev) : NULL;
}

static void hnae_free_buffers(struct hnae_ring *ring)
{
	int i;

	for (i = 0; i < ring->desc_num; i++)
		hnae_free_buffer_detach(ring, i);
}

/* Allocate memory for raw pkg, and map with dma */
static int hnae_alloc_buffers(struct hnae_ring *ring)
{
	int i, j, ret;

	for (i = 0; i < ring->desc_num; i++) {
		ret = hnae_alloc_buffer_attach(ring, i);
		if (ret)
			goto out_buffer_fail;
	}

	return 0;

out_buffer_fail:
	for (j = i - 1; j >= 0; j--)
		hnae_free_buffer_detach(ring, j);
	return ret;
}

/* free desc along with its attached buffer */
static void hnae_free_desc(struct hnae_ring *ring)
{
	hnae_free_buffers(ring);
	dma_unmap_single(ring_to_dev(ring), ring->desc_dma_addr,
			 ring->desc_num * sizeof(ring->desc[0]),
			 ring_to_dma_dir(ring));
	ring->desc_dma_addr = 0;
	kfree(ring->desc);
	ring->desc = NULL;
}

/* alloc desc, without buffer attached */
static int hnae_alloc_desc(struct hnae_ring *ring)
{
	int size = ring->desc_num * sizeof(ring->desc[0]);

	ring->desc = kzalloc(size, GFP_KERNEL);
	if (!ring->desc)
		return -ENOMEM;

	ring->desc_dma_addr = dma_map_single(ring_to_dev(ring),
		ring->desc, size, ring_to_dma_dir(ring));
	if (dma_mapping_error(ring_to_dev(ring), ring->desc_dma_addr)) {
		ring->desc_dma_addr = 0;
		kfree(ring->desc);
		ring->desc = NULL;
		return -ENOMEM;
	}

	return 0;
}

/* fini ring, also free the buffer for the ring */
static void hnae_fini_ring(struct hnae_ring *ring)
{
	hnae_free_desc(ring);
	kfree(ring->desc_cb);
	ring->desc_cb = NULL;
	ring->next_to_clean = 0;
	ring->next_to_use = 0;
}

/* init ring, and with buffer for rx ring */
static int
hnae_init_ring(struct hnae_queue *q, struct hnae_ring *ring, int flags)
{
	int ret;

	if (ring->desc_num <= 0 || ring->buf_size <= 0)
		return -EINVAL;

	ring->q = q;
	ring->flags = flags;
	spin_lock_init(&ring->lock);
	assert(!ring->desc && !ring->desc_cb && !ring->desc_dma_addr);

	/* not matter for tx or rx ring, the ntc and ntc start from 0 */
	assert(ring->next_to_use == 0);
	assert(ring->next_to_clean == 0);

	ring->desc_cb = kcalloc(ring->desc_num, sizeof(ring->desc_cb[0]),
			GFP_KERNEL);
	if (!ring->desc_cb) {
		ret = -ENOMEM;
		goto out;
	}

	ret = hnae_alloc_desc(ring);
	if (ret)
		goto out_with_desc_cb;

	if (is_rx_ring(ring)) {
		ret = hnae_alloc_buffers(ring);
		if (ret)
			goto out_with_desc;
	}

	return 0;

out_with_desc:
	hnae_free_desc(ring);
out_with_desc_cb:
	kfree(ring->desc_cb);
	ring->desc_cb = NULL;
out:
	return ret;
}

static int hnae_init_queue(struct hnae_handle *h, struct hnae_queue *q,
			   struct hnae_ae_dev *dev)
{
	int ret;

	q->dev = dev;
	q->handle = h;

	ret = hnae_init_ring(q, &q->tx_ring, q->tx_ring.flags | RINGF_DIR);
	if (ret)
		goto out;

	ret = hnae_init_ring(q, &q->rx_ring, q->rx_ring.flags & ~RINGF_DIR);
	if (ret)
		goto out_with_tx_ring;

	if (dev->ops->init_queue)
		dev->ops->init_queue(q);

	return 0;

out_with_tx_ring:
	hnae_fini_ring(&q->tx_ring);
out:
	return ret;
}

static void hnae_fini_queue(struct hnae_queue *q)
{
	if (q->dev->ops->fini_queue)
		q->dev->ops->fini_queue(q);

	hnae_fini_ring(&q->tx_ring);
	hnae_fini_ring(&q->rx_ring);
}

/**
 * ae_chain - define ae chain head
 */
static RAW_NOTIFIER_HEAD(ae_chain);

int hnae_register_notifier(struct notifier_block *nb)
{
	return raw_notifier_chain_register(&ae_chain, nb);
}
EXPORT_SYMBOL(hnae_register_notifier);

void hnae_unregister_notifier(struct notifier_block *nb)
{
	if (raw_notifier_chain_unregister(&ae_chain, nb))
		dev_err(NULL, "notifier chain unregister fail\n");
}
EXPORT_SYMBOL(hnae_unregister_notifier);

int hnae_reinit_handle(struct hnae_handle *handle)
{
	int i, j;
	int ret;

	for (i = 0; i < handle->q_num; i++) /* free ring*/
		hnae_fini_queue(handle->qs[i]);

	if (handle->dev->ops->reset)
		handle->dev->ops->reset(handle);

	for (i = 0; i < handle->q_num; i++) {/* reinit ring*/
		ret = hnae_init_queue(handle, handle->qs[i], handle->dev);
		if (ret)
			goto out_when_init_queue;
	}
	return 0;
out_when_init_queue:
	for (j = i - 1; j >= 0; j--)
		hnae_fini_queue(handle->qs[j]);
	return ret;
}
EXPORT_SYMBOL(hnae_reinit_handle);

/* hnae_get_handle - get a handle from the AE
 * @owner_dev: the dev use this handle
 * @ae_id: the id of the ae to be used
 * @ae_opts: the options set for the handle
 * @bops: the callbacks for buffer management
 *
 * return handle ptr or ERR_PTR
 */
struct hnae_handle *hnae_get_handle(struct device *owner_dev,
				    const struct fwnode_handle	*fwnode,
				    u32 port_id,
				    struct hnae_buf_ops *bops)
{
	struct hnae_ae_dev *dev;
	struct hnae_handle *handle;
	int i, j;
	int ret;

	dev = find_ae(fwnode);
	if (!dev)
		return ERR_PTR(-ENODEV);

	handle = dev->ops->get_handle(dev, port_id);
	if (IS_ERR(handle)) {
		put_device(&dev->cls_dev);
		return handle;
	}

	handle->dev = dev;
	handle->owner_dev = owner_dev;
	handle->bops = bops ? bops : &hnae_bops;
	handle->eport_id = port_id;

	for (i = 0; i < handle->q_num; i++) {
		ret = hnae_init_queue(handle, handle->qs[i], dev);
		if (ret)
			goto out_when_init_queue;
	}

	__module_get(dev->owner);

	hnae_list_add(&dev->lock, &handle->node, &dev->handle_list);

	return handle;

out_when_init_queue:
	for (j = i - 1; j >= 0; j--)
		hnae_fini_queue(handle->qs[j]);

	put_device(&dev->cls_dev);

	return ERR_PTR(-ENOMEM);
}
EXPORT_SYMBOL(hnae_get_handle);

void hnae_put_handle(struct hnae_handle *h)
{
	struct hnae_ae_dev *dev = h->dev;
	int i;

	for (i = 0; i < h->q_num; i++)
		hnae_fini_queue(h->qs[i]);

	if (h->dev->ops->reset)
		h->dev->ops->reset(h);

	hnae_list_del(&dev->lock, &h->node);

	if (dev->ops->put_handle)
		dev->ops->put_handle(h);

	module_put(dev->owner);

	put_device(&dev->cls_dev);
}
EXPORT_SYMBOL(hnae_put_handle);

static void hnae_release(struct device *dev)
{
}

/**
 * hnae_ae_register - register a AE engine to hnae framework
 * @hdev: the hnae ae engine device
 * @owner:  the module who provides this dev
 * NOTE: the duplicated name will not be checked
 */
int hnae_ae_register(struct hnae_ae_dev *hdev, struct module *owner)
{
	static atomic_t id = ATOMIC_INIT(-1);
	int ret;

	if (!hdev->dev)
		return -ENODEV;

	if (!hdev->ops || !hdev->ops->get_handle ||
	    !hdev->ops->toggle_ring_irq ||
	    !hdev->ops->get_status || !hdev->ops->adjust_link)
		return -EINVAL;

	hdev->owner = owner;
	hdev->id = (int)atomic_inc_return(&id);
	hdev->cls_dev.parent = hdev->dev;
	hdev->cls_dev.class = hnae_class;
	hdev->cls_dev.release = hnae_release;
	(void)dev_set_name(&hdev->cls_dev, "hnae%d", hdev->id);
	ret = device_register(&hdev->cls_dev);
	if (ret)
		return ret;

	__module_get(THIS_MODULE);

	INIT_LIST_HEAD(&hdev->handle_list);
	spin_lock_init(&hdev->lock);

	ret = raw_notifier_call_chain(&ae_chain, HNAE_AE_REGISTER, NULL);
	if (ret)
		dev_dbg(hdev->dev,
			"has not notifier for AE: %s\n", hdev->name);

	return 0;
}
EXPORT_SYMBOL(hnae_ae_register);

/**
 * hnae_ae_unregister - unregisters a HNAE AE engine
 * @cdev: the device to unregister
 */
void hnae_ae_unregister(struct hnae_ae_dev *hdev)
{
	device_unregister(&hdev->cls_dev);
	module_put(THIS_MODULE);
}
EXPORT_SYMBOL(hnae_ae_unregister);

static int __init hnae_init(void)
{
	hnae_class = class_create(THIS_MODULE, "hnae");
	return PTR_ERR_OR_ZERO(hnae_class);
}

static void __exit hnae_exit(void)
{
	class_destroy(hnae_class);
}

subsys_initcall(hnae_init);
module_exit(hnae_exit);

MODULE_AUTHOR("Hisilicon, Inc.");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Hisilicon Network Acceleration Engine Framework");

/* vi: set tw=78 noet: */
Commit	Line	Data
6fe6611f	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	{
8857135e	60	if (unlikely(!cb->priv))
	61	return;
	62
6fe6611f	63	if (cb->type == DESC_TYPE_SKB)
	64	dev_kfree_skb_any((struct sk_buff *)cb->priv);
	65	else if (unlikely(is_rx_ring(ring)))
	66	put_page((struct page *)cb->priv);
8857135e	67
8857135e	68	cb->priv = NULL;
6fe6611f	69	}
	70
	71	static int hnae_map_buffer(struct hnae_ring ring, struct hnae_desc_cb cb)
	72	{
	73	cb->dma = dma_map_page(ring_to_dev(ring), cb->priv, 0,
	74	cb->length, ring_to_dma_dir(ring));
	75
	76	if (dma_mapping_error(ring_to_dev(ring), cb->dma))
	77	return -EIO;
	78
	79	return 0;
	80	}
	81
	82	static void hnae_unmap_buffer(struct hnae_ring ring, struct hnae_desc_cb cb)
	83	{
	84	if (cb->type == DESC_TYPE_SKB)
	85	dma_unmap_single(ring_to_dev(ring), cb->dma, cb->length,
	86	ring_to_dma_dir(ring));
	87	else
	88	dma_unmap_page(ring_to_dev(ring), cb->dma, cb->length,
	89	ring_to_dma_dir(ring));
	90	}
	91
	92	static struct hnae_buf_ops hnae_bops = {
	93	.alloc_buffer = hnae_alloc_buffer,
	94	.free_buffer = hnae_free_buffer,
	95	.map_buffer = hnae_map_buffer,
	96	.unmap_buffer = hnae_unmap_buffer,
	97	};
	98
	99	static int __ae_match(struct device dev, const void data)
	100	{
	101	struct hnae_ae_dev *hdev = cls_to_ae_dev(dev);
6fe6611f	102
652d39b0 KY	103	if (dev_of_node(hdev->dev))
	104	return (data == &hdev->dev->of_node->fwnode);
	105	else if (is_acpi_node(hdev->dev->fwnode))
	106	return (data == hdev->dev->fwnode);
	107
	108	dev_err(dev, "__ae_match cannot read cfg data from OF or acpi\n");
	109	return 0;
6fe6611f	110	}
6fe6611f	111
7b2acae6	112	static struct hnae_ae_dev find_ae(const struct fwnode_handle fwnode)
6fe6611f	113	{
	114	struct device *dev;
	115
7b2acae6	116	WARN_ON(!fwnode);
6fe6611f	117
7b2acae6	118	dev = class_find_device(hnae_class, NULL, fwnode, __ae_match);
6fe6611f	119
	120	return dev ? cls_to_ae_dev(dev) : NULL;
	121	}
	122
	123	static void hnae_free_buffers(struct hnae_ring *ring)
	124	{
	125	int i;
	126
	127	for (i = 0; i < ring->desc_num; i++)
	128	hnae_free_buffer_detach(ring, i);
	129	}
	130
	131	/* Allocate memory for raw pkg, and map with dma */
	132	static int hnae_alloc_buffers(struct hnae_ring *ring)
	133	{
	134	int i, j, ret;
	135
	136	for (i = 0; i < ring->desc_num; i++) {
	137	ret = hnae_alloc_buffer_attach(ring, i);
	138	if (ret)
	139	goto out_buffer_fail;
	140	}
	141
	142	return 0;
	143
	144	out_buffer_fail:
	145	for (j = i - 1; j >= 0; j--)
	146	hnae_free_buffer_detach(ring, j);
	147	return ret;
	148	}
	149
	150	/* free desc along with its attached buffer */
	151	static void hnae_free_desc(struct hnae_ring *ring)
	152	{
	153	hnae_free_buffers(ring);
	154	dma_unmap_single(ring_to_dev(ring), ring->desc_dma_addr,
	155	ring->desc_num * sizeof(ring->desc[0]),
	156	ring_to_dma_dir(ring));
	157	ring->desc_dma_addr = 0;
	158	kfree(ring->desc);
	159	ring->desc = NULL;
	160	}
	161
	162	/* alloc desc, without buffer attached */
	163	static int hnae_alloc_desc(struct hnae_ring *ring)
	164	{
	165	int size = ring->desc_num * sizeof(ring->desc[0]);
	166
	167	ring->desc = kzalloc(size, GFP_KERNEL);
	168	if (!ring->desc)
	169	return -ENOMEM;
	170
	171	ring->desc_dma_addr = dma_map_single(ring_to_dev(ring),
	172	ring->desc, size, ring_to_dma_dir(ring));
	173	if (dma_mapping_error(ring_to_dev(ring), ring->desc_dma_addr)) {
	174	ring->desc_dma_addr = 0;
	175	kfree(ring->desc);
	176	ring->desc = NULL;
	177	return -ENOMEM;
	178	}
	179
	180	return 0;
	181	}
	182
183	/* fini ring, also free the buffer for the ring */
184	static void hnae_fini_ring(struct hnae_ring *ring)
185	{
186	hnae_free_desc(ring);
187	kfree(ring->desc_cb);
188	ring->desc_cb = NULL;
189	ring->next_to_clean = 0;
190	ring->next_to_use = 0;
191	}
192
193	/* init ring, and with buffer for rx ring */
194	static int
195	hnae_init_ring(struct hnae_queue q, struct hnae_ring ring, int flags)
196	{
197	int ret;
198
199	if (ring->desc_num <= 0 \|\| ring->buf_size <= 0)
200	return -EINVAL;
201
202	ring->q = q;
203	ring->flags = flags;
74800fc9	204	spin_lock_init(&ring->lock);
6fe6611f	205	assert(!ring->desc && !ring->desc_cb && !ring->desc_dma_addr);
	206
	207	/* not matter for tx or rx ring, the ntc and ntc start from 0 */
	208	assert(ring->next_to_use == 0);
	209	assert(ring->next_to_clean == 0);
	210
	211	ring->desc_cb = kcalloc(ring->desc_num, sizeof(ring->desc_cb[0]),
	212	GFP_KERNEL);
	213	if (!ring->desc_cb) {
	214	ret = -ENOMEM;
	215	goto out;
	216	}
	217
	218	ret = hnae_alloc_desc(ring);
	219	if (ret)
	220	goto out_with_desc_cb;
	221
	222	if (is_rx_ring(ring)) {
	223	ret = hnae_alloc_buffers(ring);
	224	if (ret)
	225	goto out_with_desc;
	226	}
	227
	228	return 0;
	229
	230	out_with_desc:
	231	hnae_free_desc(ring);
	232	out_with_desc_cb:
	233	kfree(ring->desc_cb);
	234	ring->desc_cb = NULL;
	235	out:
	236	return ret;
	237	}
	238
	239	static int hnae_init_queue(struct hnae_handle h, struct hnae_queue q,
	240	struct hnae_ae_dev *dev)
	241	{
	242	int ret;
	243
	244	q->dev = dev;
	245	q->handle = h;
	246
	247	ret = hnae_init_ring(q, &q->tx_ring, q->tx_ring.flags \| RINGF_DIR);
	248	if (ret)
	249	goto out;
	250
	251	ret = hnae_init_ring(q, &q->rx_ring, q->rx_ring.flags & ~RINGF_DIR);
	252	if (ret)
	253	goto out_with_tx_ring;
	254
	255	if (dev->ops->init_queue)
	256	dev->ops->init_queue(q);
	257
	258	return 0;
	259
	260	out_with_tx_ring:
	261	hnae_fini_ring(&q->tx_ring);
	262	out:
	263	return ret;
	264	}
	265
	266	static void hnae_fini_queue(struct hnae_queue *q)
	267	{
	268	if (q->dev->ops->fini_queue)
269	q->dev->ops->fini_queue(q);
270
271	hnae_fini_ring(&q->tx_ring);
272	hnae_fini_ring(&q->rx_ring);
273	}
274
275	/**
276	* ae_chain - define ae chain head
277	*/
278	static RAW_NOTIFIER_HEAD(ae_chain);
279
280	int hnae_register_notifier(struct notifier_block *nb)
281	{
282	return raw_notifier_chain_register(&ae_chain, nb);
283	}
284	EXPORT_SYMBOL(hnae_register_notifier);
285
286	void hnae_unregister_notifier(struct notifier_block *nb)
287	{
288	if (raw_notifier_chain_unregister(&ae_chain, nb))
289	dev_err(NULL, "notifier chain unregister fail\n");
290	}
291	EXPORT_SYMBOL(hnae_unregister_notifier);
292
293	int hnae_reinit_handle(struct hnae_handle *handle)
294	{
295	int i, j;
296	int ret;
297
298	for (i = 0; i < handle->q_num; i++) /* free ring*/
299	hnae_fini_queue(handle->qs[i]);
300
301	if (handle->dev->ops->reset)
302	handle->dev->ops->reset(handle);
303
304	for (i = 0; i < handle->q_num; i++) {/* reinit ring*/
305	ret = hnae_init_queue(handle, handle->qs[i], handle->dev);
306	if (ret)
307	goto out_when_init_queue;
308	}
309	return 0;
310	out_when_init_queue:
311	for (j = i - 1; j >= 0; j--)
312	hnae_fini_queue(handle->qs[j]);
313	return ret;
314	}
315	EXPORT_SYMBOL(hnae_reinit_handle);
316
317	/* hnae_get_handle - get a handle from the AE
318	* @owner_dev: the dev use this handle
319	* @ae_id: the id of the ae to be used
320	* @ae_opts: the options set for the handle
321	* @bops: the callbacks for buffer management
322	*
323	* return handle ptr or ERR_PTR
324	*/
325	struct hnae_handle hnae_get_handle(struct device owner_dev,
7b2acae6	326	const struct fwnode_handle *fwnode,
48189d6a	327	u32 port_id,
6fe6611f	328	struct hnae_buf_ops *bops)
	329	{
	330	struct hnae_ae_dev *dev;
	331	struct hnae_handle *handle;
	332	int i, j;
	333	int ret;
	334
7b2acae6	335	dev = find_ae(fwnode);
6fe6611f	336	if (!dev)
	337	return ERR_PTR(-ENODEV);
	338
	339	handle = dev->ops->get_handle(dev, port_id);
2271150b JH	340	if (IS_ERR(handle)) {
2271150b JH	341	put_device(&dev->cls_dev);
6fe6611f	342	return handle;
2271150b	343	}
6fe6611f	344
	345	handle->dev = dev;
	346	handle->owner_dev = owner_dev;
	347	handle->bops = bops ? bops : &hnae_bops;
	348	handle->eport_id = port_id;
	349
	350	for (i = 0; i < handle->q_num; i++) {
	351	ret = hnae_init_queue(handle, handle->qs[i], dev);
	352	if (ret)
	353	goto out_when_init_queue;
	354	}
	355
	356	__module_get(dev->owner);
	357
	358	hnae_list_add(&dev->lock, &handle->node, &dev->handle_list);
	359
	360	return handle;
	361
	362	out_when_init_queue:
	363	for (j = i - 1; j >= 0; j--)
	364	hnae_fini_queue(handle->qs[j]);
	365
2271150b JH	366	put_device(&dev->cls_dev);
2271150b JH	367
6fe6611f	368	return ERR_PTR(-ENOMEM);
	369	}
	370	EXPORT_SYMBOL(hnae_get_handle);
	371
	372	void hnae_put_handle(struct hnae_handle *h)
	373	{
	374	struct hnae_ae_dev *dev = h->dev;
	375	int i;
	376
	377	for (i = 0; i < h->q_num; i++)
	378	hnae_fini_queue(h->qs[i]);
	379
	380	if (h->dev->ops->reset)
	381	h->dev->ops->reset(h);
	382
	383	hnae_list_del(&dev->lock, &h->node);
	384
	385	if (dev->ops->put_handle)
	386	dev->ops->put_handle(h);
	387
	388	module_put(dev->owner);
2271150b JH	389
2271150b JH	390	put_device(&dev->cls_dev);
6fe6611f	391	}
	392	EXPORT_SYMBOL(hnae_put_handle);
	393
	394	static void hnae_release(struct device *dev)
	395	{
	396	}
	397
	398	/**
	399	* hnae_ae_register - register a AE engine to hnae framework
	400	* @hdev: the hnae ae engine device
	401	* @owner: the module who provides this dev
	402	* NOTE: the duplicated name will not be checked
	403	*/
	404	int hnae_ae_register(struct hnae_ae_dev hdev, struct module owner)
	405	{
	406	static atomic_t id = ATOMIC_INIT(-1);
	407	int ret;
	408
	409	if (!hdev->dev)
	410	return -ENODEV;
	411
	412	if (!hdev->ops \|\| !hdev->ops->get_handle \|\|
	413	!hdev->ops->toggle_ring_irq \|\|
6fe6611f	414	!hdev->ops->get_status \|\| !hdev->ops->adjust_link)
	415	return -EINVAL;
	416
	417	hdev->owner = owner;
	418	hdev->id = (int)atomic_inc_return(&id);
	419	hdev->cls_dev.parent = hdev->dev;
	420	hdev->cls_dev.class = hnae_class;
	421	hdev->cls_dev.release = hnae_release;
	422	(void)dev_set_name(&hdev->cls_dev, "hnae%d", hdev->id);
	423	ret = device_register(&hdev->cls_dev);
	424	if (ret)
	425	return ret;
	426
	427	__module_get(THIS_MODULE);
	428
	429	INIT_LIST_HEAD(&hdev->handle_list);
	430	spin_lock_init(&hdev->lock);
	431
	432	ret = raw_notifier_call_chain(&ae_chain, HNAE_AE_REGISTER, NULL);
	433	if (ret)
	434	dev_dbg(hdev->dev,
	435	"has not notifier for AE: %s\n", hdev->name);
	436
	437	return 0;
	438	}
	439	EXPORT_SYMBOL(hnae_ae_register);
	440
	441	/**
	442	* hnae_ae_unregister - unregisters a HNAE AE engine
	443	* @cdev: the device to unregister
	444	*/
	445	void hnae_ae_unregister(struct hnae_ae_dev *hdev)
	446	{
	447	device_unregister(&hdev->cls_dev);
	448	module_put(THIS_MODULE);
	449	}
	450	EXPORT_SYMBOL(hnae_ae_unregister);
	451
6fe6611f	452	static int __init hnae_init(void)
	453	{
	454	hnae_class = class_create(THIS_MODULE, "hnae");
c6aa74d5	455	return PTR_ERR_OR_ZERO(hnae_class);
6fe6611f	456	}
	457
	458	static void __exit hnae_exit(void)
	459	{
	460	class_destroy(hnae_class);
	461	}
	462
	463	subsys_initcall(hnae_init);
	464	module_exit(hnae_exit);
	465
	466	MODULE_AUTHOR("Hisilicon, Inc.");
	467	MODULE_LICENSE("GPL");
	468	MODULE_DESCRIPTION("Hisilicon Network Acceleration Engine Framework");
	469
	470	/* vi: set tw=78 noet: */