WIP FPC-III support
[linux/fpc-iii.git] / arch / um / drivers / vde_user.c
blobbc7dc4e1e486792c80e17bd99ac67a6f465f44d9
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (C) 2007 Luca Bigliardi (shammash@artha.org).
4 */
6 #include <stddef.h>
7 #include <errno.h>
8 #include <libvdeplug.h>
9 #include <net_user.h>
10 #include <um_malloc.h>
11 #include "vde.h"
13 static int vde_user_init(void *data, void *dev)
15 struct vde_data *pri = data;
16 VDECONN *conn = NULL;
17 int err = -EINVAL;
19 pri->dev = dev;
21 conn = vde_open(pri->vde_switch, pri->descr, pri->args);
23 if (conn == NULL) {
24 err = -errno;
25 printk(UM_KERN_ERR "vde_user_init: vde_open failed, "
26 "errno = %d\n", errno);
27 return err;
30 printk(UM_KERN_INFO "vde backend - connection opened\n");
32 pri->conn = conn;
34 return 0;
37 static int vde_user_open(void *data)
39 struct vde_data *pri = data;
41 if (pri->conn != NULL)
42 return vde_datafd(pri->conn);
44 printk(UM_KERN_WARNING "vde_open - we have no VDECONN to open");
45 return -EINVAL;
48 static void vde_remove(void *data)
50 struct vde_data *pri = data;
52 if (pri->conn != NULL) {
53 printk(UM_KERN_INFO "vde backend - closing connection\n");
54 vde_close(pri->conn);
55 pri->conn = NULL;
56 kfree(pri->args);
57 pri->args = NULL;
58 return;
61 printk(UM_KERN_WARNING "vde_remove - we have no VDECONN to remove");
64 const struct net_user_info vde_user_info = {
65 .init = vde_user_init,
66 .open = vde_user_open,
67 .close = NULL,
68 .remove = vde_remove,
69 .add_address = NULL,
70 .delete_address = NULL,
71 .mtu = ETH_MAX_PACKET,
72 .max_packet = ETH_MAX_PACKET + ETH_HEADER_OTHER,
75 void vde_init_libstuff(struct vde_data *vpri, struct vde_init *init)
77 struct vde_open_args *args;
79 vpri->args = uml_kmalloc(sizeof(struct vde_open_args), UM_GFP_KERNEL);
80 if (vpri->args == NULL) {
81 printk(UM_KERN_ERR "vde_init_libstuff - vde_open_args "
82 "allocation failed");
83 return;
86 args = vpri->args;
88 args->port = init->port;
89 args->group = init->group;
90 args->mode = init->mode ? init->mode : 0700;
92 args->port ? printk("port %d", args->port) :
93 printk("undefined port");
96 int vde_user_read(void *conn, void *buf, int len)
98 VDECONN *vconn = conn;
99 int rv;
101 if (vconn == NULL)
102 return 0;
104 rv = vde_recv(vconn, buf, len, 0);
105 if (rv < 0) {
106 if (errno == EAGAIN)
107 return 0;
108 return -errno;
110 else if (rv == 0)
111 return -ENOTCONN;
113 return rv;
116 int vde_user_write(void *conn, void *buf, int len)
118 VDECONN *vconn = conn;
120 if (vconn == NULL)
121 return 0;
123 return vde_send(vconn, buf, len, 0);