minix/lib/libnetdriver/netdriver.c
David van Moolenbroek 4cd78c64a4 libnetdriver: only block datalink messages
Previously, all incoming messages would be blocked before a DL_CONF
message arrives from the TCP/IP stack. This however makes it impossible
for a driver to process interrupts before the DL_CONF initialization.
This patch blocks only datalink messages before the initial DL_CONF,
and lets through all other messages to the driver.

Change-Id: I89988958c0bff9bb38e0379b66f6142491a67b61
2013-08-18 12:09:51 +02:00

82 lines
2 KiB
C

/* This file contains device independent network device driver interface.
*
* Changes:
* Apr 01, 2010 Created (Cristiano Giuffrida)
*
* The file contains the following entry points:
*
* netdriver_announce: called by a network driver to announce it is up
* netdriver_receive: receive() interface for network drivers
*/
#include <minix/drivers.h>
#include <minix/endpoint.h>
#include <minix/netdriver.h>
#include <minix/ds.h>
static int conf_expected = TRUE;
/*===========================================================================*
* netdriver_announce *
*===========================================================================*/
void netdriver_announce()
{
/* Announce we are up after a fresh start or restart. */
int r;
char key[DS_MAX_KEYLEN];
char label[DS_MAX_KEYLEN];
char *driver_prefix = "drv.net.";
/* Publish a driver up event. */
r = ds_retrieve_label_name(label, getprocnr());
if (r != OK) {
panic("driver_announce: unable to get own label: %d\n", r);
}
snprintf(key, DS_MAX_KEYLEN, "%s%s", driver_prefix, label);
r = ds_publish_u32(key, DS_DRIVER_UP, DSF_OVERWRITE);
if (r != OK) {
panic("driver_announce: unable to publish driver up event: %d\n", r);
}
conf_expected = TRUE;
}
/*===========================================================================*
* netdriver_receive *
*===========================================================================*/
int netdriver_receive(src, m_ptr, status_ptr)
endpoint_t src;
message *m_ptr;
int *status_ptr;
{
/* receive() interface for drivers. */
int r;
while (TRUE) {
/* Wait for a request. */
r = sef_receive_status(src, m_ptr, status_ptr);
if (r != OK) {
return r;
}
/* Let non-datalink requests through regardless. */
if (!IS_DL_RQ(m_ptr->m_type)) {
return r;
}
/* See if only DL_CONF is to be expected. */
if(conf_expected) {
if(m_ptr->m_type == DL_CONF) {
conf_expected = FALSE;
}
else {
continue;
}
}
break;
}
return OK;
}