blob: 3bfe36f9405b60b4822185853ca3d3d35ea563a5 [file] [log] [blame]
/*
* 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 (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);
memset(cb, 0, sizeof(*cb));
}
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);
return hdev->dev->of_node == data;
}
static struct hnae_ae_dev *find_ae(const struct device_node *ae_node)
{
struct device *dev;
WARN_ON(!ae_node);
dev = class_find_device(hnae_class, NULL, ae_node, __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;
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 device_node *ae_node,
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(ae_node);
if (!dev)
return ERR_PTR(-ENODEV);
handle = dev->ops->get_handle(dev, port_id);
if (IS_ERR(handle))
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]);
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);
}
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->toggle_queue_status ||
!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: */