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tcp_event.c
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tcp_event.c
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#include "tcp_event.h"
#include <linux/cdev.h>
#include <linux/init.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/poll.h>
#include <linux/slab.h>
// #include <linux/vmalloc.h>
static int major = -1;
static struct cdev vpoll_cdev;
static struct class *vpoll_class = NULL;
#if 1
typedef struct _tmsg_data {
char *buf;
int len;
} tmsg_data;
struct vpoll_data {
wait_queue_head_t wqh;
// __poll_t events;
__poll_t events[MAX_SZ];
tmsg_data data[MAX_SZ];
int head, tail;
};
struct vpoll_data *vpoll_data;
static int init_queue(void)
{
vpoll_data = kmalloc(sizeof(struct vpoll_data), GFP_KERNEL);
if (!vpoll_data)
return -ENOMEM;
memset(vpoll_data->events, 0, sizeof(__poll_t));
vpoll_data->head = 0;
vpoll_data->tail = 0;
init_waitqueue_head(&vpoll_data->wqh);
// file->private_data = vpoll_data;
return 0;
}
static void deinit_queue(void)
{
int i = 0;
for (i = 0; i < MAX_SZ; i++)
if (0 != vpoll_data->events[i]) {
pr_info("find %d is not taken", i);
kfree(vpoll_data->data[i].buf);
}
kfree(vpoll_data);
}
static int vpoll_open(struct inode *inode, struct file *file)
{
// struct vpoll_data *vpoll_data =
// kmalloc(sizeof(struct vpoll_data), GFP_KERNEL);
// if (!vpoll_data)
// return -ENOMEM;
// memset(vpoll_data->events, 0, sizeof(__poll_t));
// vpoll_data->head = 0;
// vpoll_data->tail = 0;
// init_waitqueue_head(&vpoll_data->wqh);
file->private_data = vpoll_data;
return 0;
}
static int vpoll_release(struct inode *inode, struct file *file)
{
// struct vpoll_data *vpoll_data = file->private_data;
// kfree(vpoll_data);
return 0;
}
static long vpoll_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
// struct vpoll_data *vpoll_data = file->private_data;
__poll_t events = arg & EPOLLALLMASK;
long res = 10;
int idx = 0;
switch (cmd) {
case VPOLL_IO_ADDEVENTS:
spin_lock_irq(&vpoll_data->wqh.lock);
if (0 != vpoll_data->events[vpoll_data->tail]) {
pr_err("Error event full\n");
spin_unlock_irq(&vpoll_data->wqh.lock);
return -EINVAL;
}
idx = vpoll_data->tail;
vpoll_data->tail = (vpoll_data->tail + 1) & QUEUE_MASK;
spin_unlock_irq(&vpoll_data->wqh.lock);
vpoll_data->events[idx] |= events;
vpoll_data->data[idx].buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
// vpoll_data->data[idx].buf = vmalloc(10);
memcpy(vpoll_data->data[idx].buf, "eventadd", 8);
vpoll_data->data[idx].len = 8;
break;
case VPOLL_IO_DELEVENTS:
pr_debug("remove event");
spin_lock_irq(&vpoll_data->wqh.lock);
idx = READ_ONCE(vpoll_data->head);
if (0 == vpoll_data->events[idx]) {
spin_unlock_irq(&vpoll_data->wqh.lock);
break;
} else {
vpoll_data->head = (vpoll_data->head + 1) & QUEUE_MASK;
spin_unlock_irq(&vpoll_data->wqh.lock);
}
vpoll_data->events[idx] &= ~events;
kfree(vpoll_data->data[idx].buf);
break;
default:
res = -EINVAL;
}
if (res >= 0) {
// res = vpoll_data->events[vpoll_data->tail];
if (waitqueue_active(&vpoll_data->wqh)) {
// WWW(&vpoll_data->wqh, vpoll_data->events);
wake_up_poll(&vpoll_data->wqh, events);
// wake_up_locked_poll(&vpoll_data->wqh, vpoll_data->eventss);
}
}
// spin_unlock_irq(&vpoll_data->wqh.lock);
return res;
}
long set_event_and_data(__poll_t event,
unsigned char *data,
unsigned int data_len)
{
__poll_t events = event & EPOLLALLMASK;
long res = 10;
int idx = 0;
spin_lock_irq(&vpoll_data->wqh.lock);
idx = vpoll_data->tail;
if (0 != vpoll_data->events[idx]) {
pr_err("Error event full\n");
spin_unlock_irq(&vpoll_data->wqh.lock);
return -EINVAL;
}
vpoll_data->tail = (vpoll_data->tail + 1) & QUEUE_MASK;
spin_unlock_irq(&vpoll_data->wqh.lock);
// printk("set (%d) = %d", idx, events);
vpoll_data->data[idx].buf =
kmalloc(PAGE_SIZE * ((data_len >> PAGE_SHIFT) + 1), GFP_KERNEL);
memcpy(vpoll_data->data[idx].buf, data, data_len);
vpoll_data->data[idx].len = data_len;
vpoll_data->events[idx] |= events;
if (waitqueue_active(&vpoll_data->wqh)) {
wake_up_poll(&vpoll_data->wqh, events);
}
return res;
}
static __poll_t vpoll_poll(struct file *file, struct poll_table_struct *wait)
{
__poll_t events;
poll_wait(file, &vpoll_data->wqh, wait);
events = READ_ONCE(vpoll_data->events[vpoll_data->head]);
// if (0 != events)
// {
// // vpoll_data->events[vpoll_data->head] &= ~events;
// // kfree(vpoll_data->buf[vpoll_data->head]);
// // vpoll_data->head +=1;
// }
return events;
}
#else
struct vpoll_data {
wait_queue_head_t wqh;
__poll_t events;
};
static int vpoll_open(struct inode *inode, struct file *file)
{
struct vpoll_data *vpoll_data =
kmalloc(sizeof(struct vpoll_data), GFP_KERNEL);
if (!vpoll_data)
return -ENOMEM;
vpoll_data->events = 0;
init_waitqueue_head(&vpoll_data->wqh);
file->private_data = vpoll_data;
return 0;
}
static int vpoll_release(struct inode *inode, struct file *file)
{
struct vpoll_data *vpoll_data = file->private_data;
kfree(vpoll_data);
return 0;
}
static long vpoll_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
struct vpoll_data *vpoll_data = file->private_data;
__poll_t events = arg & EPOLLALLMASK;
long res = 10;
spin_lock_irq(&vpoll_data->wqh.lock);
switch (cmd) {
case VPOLL_IO_ADDEVENTS:
vpoll_data->events |= events;
break;
case VPOLL_IO_DELEVENTS:
vpoll_data->events &= ~events;
break;
default:
res = -EINVAL;
}
if (res >= 0) {
res = vpoll_data->events;
if (waitqueue_active(&vpoll_data->wqh))
// WWW(&vpoll_data->wqh, vpoll_data->events);
// wake_up_poll(&vpoll_data->wqh, vpoll_data->events);
wake_up_locked_poll(&vpoll_data->wqh, vpoll_data->events);
}
spin_unlock_irq(&vpoll_data->wqh.lock);
return res;
}
static __poll_t vpoll_poll(struct file *file, struct poll_table_struct *wait)
{
struct vpoll_data *vpoll_data = file->private_data;
poll_wait(file, &vpoll_data->wqh, wait);
__poll_t events = READ_ONCE(vpoll_data->events);
vpoll_data->events &= ~events;
return events;
}
#endif
static int vpoll_mmap(struct file *fp, struct vm_area_struct *vma)
{
unsigned int read;
int ret, idx;
__poll_t events;
struct page *v_page = NULL;
unsigned long u_vsz = (unsigned long) (vma->vm_end - vma->vm_start);
idx = READ_ONCE(vpoll_data->head);
events = READ_ONCE(vpoll_data->events[idx]);
read = vpoll_data->data[idx].len;
if (read > u_vsz) {
ret = -EINVAL;
goto out;
}
v_page = virt_to_page((unsigned long) vpoll_data->data[idx].buf +
(vma->vm_pgoff << PAGE_SHIFT));
ret = remap_pfn_range(vma, vma->vm_start, page_to_pfn(v_page), u_vsz,
vma->vm_page_prot);
// if (ret != 0) {
// goto out;
// }
out:
return ret;
}
static ssize_t vpoll_read(struct file *file,
char __user *buf,
size_t count,
loff_t *ppos)
{
unsigned int read;
int ret, idx;
__poll_t events;
// struct vpoll_data *vpoll_data = file->private_data;
// printk("read data\n");
idx = READ_ONCE(vpoll_data->head);
events = READ_ONCE(vpoll_data->events[idx]);
read = vpoll_data->data[idx].len;
// read = strlen(vpoll_data->buf[idx]);
// printk("%s", vpoll_data->data[idx].buf);
ret = copy_to_user(buf, vpoll_data->data[idx].buf, read);
vpoll_data->events[idx] &= ~events;
kfree(vpoll_data->data[idx].buf);
// printk("vpoll_data->head = %d\n", vpoll_data->head);
vpoll_data->head = (vpoll_data->head + 1) & QUEUE_MASK;
return ret ? ret : read;
}
static const struct file_operations fops = {
.owner = THIS_MODULE,
.open = vpoll_open,
.release = vpoll_release,
.unlocked_ioctl = vpoll_ioctl,
.poll = vpoll_poll, // for epoll_ctl
.read = vpoll_read,
.mmap = vpoll_mmap,
};
static char *vpoll_devnode(struct device *dev, umode_t *mode)
{
if (!mode)
return NULL;
*mode = 0666;
return NULL;
}
extern char *epolldev_name;
int data_vpoll_init(void)
{
int ret;
struct device *dev;
// pr_err("PAGE_SIZE = %lu", PAGE_SIZE);
// pr_info("PAGE_SHIFT = %u", PAGE_SHIFT);
if ((ret = alloc_chrdev_region(&major, 0, 1, epolldev_name)) < 0)
return ret;
vpoll_class = class_create(THIS_MODULE, epolldev_name);
if (IS_ERR(vpoll_class)) {
ret = PTR_ERR(vpoll_class);
goto error_unregister_chrdev_region;
}
vpoll_class->devnode = vpoll_devnode;
dev = device_create(vpoll_class, NULL, major, NULL, epolldev_name);
if (IS_ERR(dev)) {
ret = PTR_ERR(dev);
goto error_class_destroy;
}
cdev_init(&vpoll_cdev, &fops);
if ((ret = cdev_add(&vpoll_cdev, major, 1)) < 0)
goto error_device_destroy;
pr_info(KERN_INFO "%s: loaded\n", epolldev_name);
ret = init_queue();
return ret;
error_device_destroy:
device_destroy(vpoll_class, major);
error_class_destroy:
class_destroy(vpoll_class);
error_unregister_chrdev_region:
unregister_chrdev_region(major, 1);
return ret;
}
void data_vpoll_exit(void)
{
deinit_queue();
device_destroy(vpoll_class, major);
cdev_del(&vpoll_cdev);
class_destroy(vpoll_class);
unregister_chrdev_region(major, 1);
pr_info(KERN_INFO "%s: unloaded\n", epolldev_name);
}
// module_init(vpoll_init);
// module_exit(vpoll_exit);