lib/libnetdriver/netdriver.c

   1 /* This file contains device independent network device driver interface.
   2  *
   3  * Changes:
   4  *   Apr 01, 2010   Created  (Cristiano Giuffrida)
   5  *
   6  * The file contains the following entry points:
   7  *
   8  *   netdriver_announce: called by a network driver to announce it is up
   9  *   netdriver_receive:  receive() interface for network drivers
  10  */
  11
  12 #include <minix/drivers.h>
  13 #include <minix/endpoint.h>
  14 #include <minix/netdriver.h>
  15 #include <minix/ds.h>
  16
  17 static int conf_expected = TRUE;
  18
  19 /*===========================================================================*
  20  *                          netdriver_announce                               *
  21  *===========================================================================*/
  22 void netdriver_announce()
  23 {
  24 /* Announce we are up after a fresh start or restart. */
  25   int r;
  26   char key[DS_MAX_KEYLEN];
  27   char label[DS_MAX_KEYLEN];
  28   char *driver_prefix = "drv.net.";
  29
  30   /* Publish a driver up event. */
  31   r = ds_retrieve_label_name(label, sef_self());
  32   if (r != OK) {
  33         panic("driver_announce: unable to get own label: %d\n", r);
  34   }
  35   snprintf(key, DS_MAX_KEYLEN, "%s%s", driver_prefix, label);
  36   r = ds_publish_u32(key, DS_DRIVER_UP, DSF_OVERWRITE);
  37   if (r != OK) {
  38         panic("driver_announce: unable to publish driver up event: %d\n", r);
  39   }
  40
  41   conf_expected = TRUE;
  42 }
  43
  44 /*===========================================================================*
  45  *                           netdriver_receive                               *
  46  *===========================================================================*/
  47 int netdriver_receive(src, m_ptr, status_ptr)
  48 endpoint_t src;
  49 message *m_ptr;
  50 int *status_ptr;
  51 {
  52 /* receive() interface for drivers. */
  53   int r;
  54
  55   while (TRUE) {
  56         /* Wait for a request. */
  57         r = sef_receive_status(src, m_ptr, status_ptr);
  58         if (r != OK) {
  59                 return r;
  60         }
  61
  62         /* Let non-datalink requests through regardless. */
  63         if (!IS_DL_RQ(m_ptr->m_type)) {
  64                 return r;
  65         }
  66
  67         /* See if only DL_CONF is to be expected. */
  68         if(conf_expected) {
  69                 if(m_ptr->m_type == DL_CONF) {
  70                         conf_expected = FALSE;
  71                 }
  72                 else {
  73                         continue;
  74                 }
  75         }
  76
  77         break;
  78   }
  79
  80   return OK;
  81 }
  82