aboutsummaryrefslogtreecommitdiffstats
path: root/arch/um/drivers/vde_user.c
blob: 7533cd3cbba40e3ce604e43c67a02ba093f87e50 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
/*
 * Copyright (C) 2007 Luca Bigliardi (shammash@artha.org).
 * Licensed under the GPL.
 */

#include <stddef.h>
#include <errno.h>
#include <libvdeplug.h>
#include "kern_constants.h"
#include "net_user.h"
#include "um_malloc.h"
#include "user.h"
#include "vde.h"

#define MAX_PACKET (ETH_MAX_PACKET + ETH_HEADER_OTHER)

static int vde_user_init(void *data, void *dev)
{
	struct vde_data *pri = data;
	VDECONN *conn = NULL;
	int err = -EINVAL;

	pri->dev = dev;

	conn = vde_open(pri->vde_switch, pri->descr, pri->args);

	if (conn == NULL) {
		err = -errno;
		printk(UM_KERN_ERR "vde_user_init: vde_open failed, "
		       "errno = %d\n", errno);
		return err;
	}

	printk(UM_KERN_INFO "vde backend - connection opened\n");

	pri->conn = conn;

	return 0;
}

static int vde_user_open(void *data)
{
	struct vde_data *pri = data;

	if (pri->conn != NULL)
		return vde_datafd(pri->conn);

	printk(UM_KERN_WARNING "vde_open - we have no VDECONN to open");
	return -EINVAL;
}

static void vde_remove(void *data)
{
	struct vde_data *pri = data;

	if (pri->conn != NULL) {
		printk(UM_KERN_INFO "vde backend - closing connection\n");
		vde_close(pri->conn);
		pri->conn = NULL;
		kfree(pri->args);
		pri->args = NULL;
		return;
	}

	printk(UM_KERN_WARNING "vde_remove - we have no VDECONN to remove");
}

static int vde_set_mtu(int mtu, void *data)
{
	return mtu;
}

const struct net_user_info vde_user_info = {
	.init		= vde_user_init,
	.open		= vde_user_open,
	.close	 	= NULL,
	.remove	 	= vde_remove,
	.set_mtu	= vde_set_mtu,
	.add_address	= NULL,
	.delete_address = NULL,
	.max_packet	= MAX_PACKET - ETH_HEADER_OTHER
};

void vde_init_libstuff(struct vde_data *vpri, struct vde_init *init)
{
	struct vde_open_args *args;

	vpri->args = kmalloc(sizeof(struct vde_open_args), UM_GFP_KERNEL);
	if (vpri->args == NULL) {
		printk(UM_KERN_ERR "vde_init_libstuff - vde_open_args"
		       "allocation failed");
		return;
	}

	args = vpri->args;

	args->port = init->port;
	args->group = init->group;
	args->mode = init->mode ? init->mode : 0700;

	args->port ?  printk(UM_KERN_INFO "port %d", args->port) :
		printk(UM_KERN_INFO "undefined port");
}

int vde_user_read(void *conn, void *buf, int len)
{
	VDECONN *vconn = conn;
	int rv;

	if (vconn == NULL)
		return 0;

	rv = vde_recv(vconn, buf, len, 0);
	if (rv < 0) {
		if (errno == EAGAIN)
			return 0;
		return -errno;
	}
	else if (rv == 0)
		return -ENOTCONN;

	return rv;
}

int vde_user_write(void *conn, void *buf, int len)
{
	VDECONN *vconn = conn;

	if (vconn == NULL)
		return 0;

	return vde_send(vconn, buf, len, 0);
}