arch/um/drivers/vde_user.c

   1 /*
   2  * Copyright (C) 2007 Luca Bigliardi (shammash@artha.org).
   3  * Licensed under the GPL.
   4  */
   5
   6 #include <stddef.h>
   7 #include <errno.h>
   8 #include <libvdeplug.h>
   9 #include "kern_constants.h"
  10 #include "net_user.h"
  11 #include "um_malloc.h"
  12 #include "user.h"
  13 #include "vde.h"
  14
  15 static int vde_user_init(void *data, void *dev)
  16 {
  17         struct vde_data *pri = data;
  18         VDECONN *conn = NULL;
  19         int err = -EINVAL;
  20
  21         pri->dev = dev;
  22
  23         conn = vde_open(pri->vde_switch, pri->descr, pri->args);
  24
  25         if (conn == NULL) {
  26                 err = -errno;
  27                 printk(UM_KERN_ERR "vde_user_init: vde_open failed, "
  28                        "errno = %d\n", errno);
  29                 return err;
  30         }
  31
  32         printk(UM_KERN_INFO "vde backend - connection opened\n");
  33
  34         pri->conn = conn;
  35
  36         return 0;
  37 }
  38
  39 static int vde_user_open(void *data)
  40 {
  41         struct vde_data *pri = data;
  42
  43         if (pri->conn != NULL)
  44                 return vde_datafd(pri->conn);
  45
  46         printk(UM_KERN_WARNING "vde_open - we have no VDECONN to open");
  47         return -EINVAL;
  48 }
  49
  50 static void vde_remove(void *data)
  51 {
  52         struct vde_data *pri = data;
  53
  54         if (pri->conn != NULL) {
  55                 printk(UM_KERN_INFO "vde backend - closing connection\n");
  56                 vde_close(pri->conn);
  57                 pri->conn = NULL;
  58                 kfree(pri->args);
  59                 pri->args = NULL;
  60                 return;
  61         }
  62
  63         printk(UM_KERN_WARNING "vde_remove - we have no VDECONN to remove");
  64 }
  65
  66 const struct net_user_info vde_user_info = {
  67         .init           = vde_user_init,
  68         .open           = vde_user_open,
  69         .close          = NULL,
  70         .remove         = vde_remove,
  71         .add_address    = NULL,
  72         .delete_address = NULL,
  73         .mtu            = ETH_MAX_PACKET,
  74         .max_packet     = ETH_MAX_PACKET + ETH_HEADER_OTHER,
  75 };
  76
  77 void vde_init_libstuff(struct vde_data *vpri, struct vde_init *init)
  78 {
  79         struct vde_open_args *args;
  80
  81         vpri->args = kmalloc(sizeof(struct vde_open_args), UM_GFP_KERNEL);
  82         if (vpri->args == NULL) {
  83                 printk(UM_KERN_ERR "vde_init_libstuff - vde_open_args"
  84                        "allocation failed");
  85                 return;
  86         }
  87
  88         args = vpri->args;
  89
  90         args->port = init->port;
  91         args->group = init->group;
  92         args->mode = init->mode ? init->mode : 0700;
  93
  94         args->port ?  printk(UM_KERN_INFO "port %d", args->port) :
  95                 printk(UM_KERN_INFO "undefined port");
  96 }
  97
  98 int vde_user_read(void *conn, void *buf, int len)
  99 {
 100         VDECONN *vconn = conn;
 101         int rv;
 102
 103         if (vconn == NULL)
 104                 return 0;
 105
 106         rv = vde_recv(vconn, buf, len, 0);
 107         if (rv < 0) {
 108                 if (errno == EAGAIN)
 109                         return 0;
 110                 return -errno;
 111         }
 112         else if (rv == 0)
 113                 return -ENOTCONN;
 114
 115         return rv;
 116 }
 117
 118 int vde_user_write(void *conn, void *buf, int len)
 119 {
 120         VDECONN *vconn = conn;
 121
 122         if (vconn == NULL)
 123                 return 0;
 124
 125         return vde_send(vconn, buf, len, 0);
 126 }
 127