palacios/src/devices/nic_bridge.c

   1 /*
   2  * This file is part of the Palacios Virtual Machine Monitor developed
   3  * by the V3VEE Project with funding from the United States National
   4  * Science Foundation and the Department of Energy.
   5  *
   6  * The V3VEE Project is a joint project between Northwestern University
   7  * and the University of New Mexico.  You can find out more at
   8  * http://www.v3vee.org
   9  *
  10  * Copyright (c) 2010, Lei Xia <lxia@northwestern.edu>
  11  * Copyright (c) 2010, The V3VEE Project <http://www.v3vee.org>
  12  * All rights reserved.
  13  *
  14  * Author: Lei Xia <lxia@northwestern.edu>
  15  *
  16  *
  17  * This is free software.  You are permitted to use,
  18  * redistribute, and modify it as specified in the file "V3VEE_LICENSE".
  19  */
  20 //backend device for Virtio NIC, Direct Network Bridge
  21
  22 #include <palacios/vmm.h>
  23 #include <palacios/vmm_dev_mgr.h>
  24 #include <palacios/vm_guest_mem.h>
  25 #include <palacios/vmm_sprintf.h>
  26 #include <interfaces/vmm_packet.h>
  27
  28 #ifndef V3_CONFIG_DEBUG_NIC_BRIDGE
  29 #undef PrintDebug
  30 #define PrintDebug(fmt, args...)
  31 #endif
  32
  33 struct nic_bridge_state {
  34     struct v3_vm_info * vm;
  35     struct v3_dev_net_ops net_ops;
  36 };
  37
  38 static int bridge_send(uint8_t * buf, uint32_t len,
  39                        int synchronize,
  40                        void * private_data) {
  41
  42 #ifdef V3_CONFIG_DEBUG_NIC_BRIDGE
  43     {
  44         PrintDebug("NIC Bridge: send pkt size: %d\n", len);
  45         v3_hexdump(buf, len, NULL, 0);
  46     }
  47 #endif
  48
  49     return V3_send_raw(buf, len);
  50 }
  51
  52 static int packet_input(struct v3_vm_info * vm,
  53                         struct v3_packet_event * evt,
  54                         void * private_data) {
  55     struct nic_bridge_state * bridge = (struct nic_bridge_state *)private_data;
  56
  57 #ifdef V3_CONFIG_DEBUG_NIC_BRIDGE
  58     {
  59         PrintDebug("NIC Bridge: recv pkt size: %d\n", evt->size);
  60         v3_hexdump(evt->pkt, evt->size, NULL, 0);
  61     }
  62 #endif
  63
  64     return bridge->net_ops.recv(evt->pkt,
  65                                 evt->size,
  66                                 bridge->net_ops.frontend_data);
  67 }
  68
  69
  70 static int nic_bridge_free(struct nic_bridge_state * bridge) {
  71
  72     /*detach from front device */
  73
  74     V3_Free(bridge);
  75
  76     return 0;
  77 }
  78
  79 static struct v3_device_ops dev_ops = {
  80     .free = (int (*)(void *))nic_bridge_free,
  81
  82 };
  83
  84 static int nic_bridge_init(struct v3_vm_info * vm, v3_cfg_tree_t * cfg) {
  85     struct nic_bridge_state * bridge = NULL;
  86     char * dev_id = v3_cfg_val(cfg, "ID");
  87
  88     v3_cfg_tree_t * frontend_cfg = v3_cfg_subtree(cfg, "frontend");
  89
  90     bridge = (struct nic_bridge_state *)V3_Malloc(sizeof(struct nic_bridge_state));
  91     memset(bridge, 0, sizeof(struct nic_bridge_state));
  92
  93     struct vm_device * dev = v3_add_device(vm, dev_id, &dev_ops, bridge);
  94
  95     if (dev == NULL) {
  96         PrintError("Could not attach device %s\n", dev_id);
  97         V3_Free(bridge);
  98         return -1;
  99     }
 100
 101     bridge->net_ops.send = bridge_send;
 102     bridge->vm = vm;
 103
 104     if (v3_dev_connect_net(vm, v3_cfg_val(frontend_cfg, "tag"),
 105                            &(bridge->net_ops), frontend_cfg, bridge) == -1) {
 106         PrintError("Could not connect %s to frontend %s\n",
 107                    dev_id, v3_cfg_val(frontend_cfg, "tag"));
 108         v3_remove_device(dev);
 109         return -1;
 110     }
 111
 112     PrintDebug("NIC-Bridge: Connect %s to frontend %s\n",
 113               dev_id, v3_cfg_val(frontend_cfg, "tag"));
 114
 115
 116     V3_packet_add_recver(bridge->net_ops.fnt_mac, vm);
 117     v3_hook_host_event(vm, HOST_PACKET_EVT, V3_HOST_EVENT_HANDLER(packet_input), bridge);
 118
 119     return 0;
 120 }
 121
 122 device_register("NIC_BRIDGE", nic_bridge_init)