minix/servers/lwip/lwip.c

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#include <unistd.h>
#include <timers.h>
#include <sys/svrctl.h>
#include <minix/ds.h>
#include <minix/endpoint.h>
#include <errno.h>
#include <minix/sef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
Split block/character protocols and libdriver This patch separates the character and block driver communication protocols. The old character protocol remains the same, but a new block protocol is introduced. The libdriver library is replaced by two new libraries: libchardriver and libblockdriver. Their exposed API, and drivers that use them, have been updated accordingly. Together, libbdev and libblockdriver now completely abstract away the message format used by the block protocol. As the memory driver is both a character and a block device driver, it now implements its own message loop. The most important semantic change made to the block protocol is that it is no longer possible to return both partial results and an error for a single transfer. This simplifies the interaction between the caller and the driver, as the I/O vector no longer needs to be copied back. Also, drivers are now no longer supposed to decide based on the layout of the I/O vector when a transfer should be cut short. Put simply, transfers are now supposed to either succeed completely, or result in an error. After this patch, the state of the various pieces is as follows: - block protocol: stable - libbdev API: stable for synchronous communication - libblockdriver API: needs slight revision (the drvlib/partition API in particular; the threading API will also change shortly) - character protocol: needs cleanup - libchardriver API: needs cleanup accordingly - driver restarts: largely unsupported until endpoint changes are reintroduced As a side effect, this patch eliminates several bugs, hacks, and gcc -Wall and -W warnings all over the place. It probably introduces a few new ones, too. Update warning: this patch changes the protocol between MFS and disk drivers, so in order to use old/new images, the MFS from the ramdisk must be used to mount all file systems.
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#include <minix/chardriver.h>
#include <minix/syslib.h>
#include <minix/sysutil.h>
#include <minix/timers.h>
#include <minix/netsock.h>
#include "proto.h"
#include <lwip/mem.h>
#include <lwip/pbuf.h>
#include <lwip/stats.h>
#include <lwip/netif.h>
#include <netif/etharp.h>
#include <lwip/tcp_impl.h>
endpoint_t lwip_ep;
static timer_t tcp_ftmr, tcp_stmr, arp_tmr;
static int arp_ticks, tcp_fticks, tcp_sticks;
static struct netif * netif_lo;
extern struct sock_ops sock_udp_ops;
extern struct sock_ops sock_tcp_ops;
extern struct sock_ops sock_raw_ip_ops;
static void sys_init(void)
{
}
static void arp_watchdog(__unused timer_t *tp)
{
etharp_tmr();
set_timer(&arp_tmr, arp_ticks, arp_watchdog, 0);
}
static void tcp_fwatchdog(__unused timer_t *tp)
{
tcp_fasttmr();
set_timer(&tcp_ftmr, tcp_fticks, tcp_fwatchdog, 0);
}
static void tcp_swatchdog(__unused timer_t *tp)
{
tcp_slowtmr();
set_timer(&tcp_ftmr, tcp_sticks, tcp_swatchdog, 0);
}
static int sef_cb_init_fresh(__unused int type, __unused sef_init_info_t *info)
{
int err;
unsigned int hz;
char my_name[16];
int my_priv;
err = sys_whoami(&lwip_ep, my_name, sizeof(my_name), &my_priv);
if (err != OK)
panic("Cannot get own endpoint");
nic_init_all();
inet_read_conf();
/* init lwip library */
stats_init();
sys_init();
mem_init();
memp_init();
pbuf_init();
hz = sys_hz();
arp_ticks = ARP_TMR_INTERVAL / (1000 / hz);
tcp_fticks = TCP_FAST_INTERVAL / (1000 / hz);
tcp_sticks = TCP_SLOW_INTERVAL / (1000 / hz);
etharp_init();
set_timer(&arp_tmr, arp_ticks, arp_watchdog, 0);
set_timer(&tcp_ftmr, tcp_fticks, tcp_fwatchdog, 0);
set_timer(&tcp_stmr, tcp_sticks, tcp_swatchdog, 0);
netif_init();
netif_lo = netif_find(__UNCONST("lo0"));
/* Read configuration. */
#if 0
nw_conf();
/* Get a random number */
timerand= 1;
fd = open(RANDOM_DEV_NAME, O_RDONLY | O_NONBLOCK);
if (fd != -1)
{
err= read(fd, randbits, sizeof(randbits));
if (err == sizeof(randbits))
timerand= 0;
else
{
printf("inet: unable to read random data from %s: %s\n",
RANDOM_DEV_NAME, err == -1 ? strerror(errno) :
err == 0 ? "EOF" : "not enough data");
}
close(fd);
}
else
{
printf("inet: unable to open random device %s: %s\n",
RANDOM_DEV_NAME, strerror(errno));
}
if (timerand)
{
printf("inet: using current time for random-number seed\n");
err= gettimeofday(&tv, NULL);
if (err == -1)
{
printf("sysutime failed: %s\n", strerror(errno));
exit(1);
}
memcpy(randbits, &tv, sizeof(tv));
}
init_rand256(randbits);
#endif
/* Subscribe to driver events for network drivers. */
if ((err = ds_subscribe("drv\\.net\\..*",
DSF_INITIAL | DSF_OVERWRITE)) != OK)
panic(("inet: can't subscribe to driver events"));
Split block/character protocols and libdriver This patch separates the character and block driver communication protocols. The old character protocol remains the same, but a new block protocol is introduced. The libdriver library is replaced by two new libraries: libchardriver and libblockdriver. Their exposed API, and drivers that use them, have been updated accordingly. Together, libbdev and libblockdriver now completely abstract away the message format used by the block protocol. As the memory driver is both a character and a block device driver, it now implements its own message loop. The most important semantic change made to the block protocol is that it is no longer possible to return both partial results and an error for a single transfer. This simplifies the interaction between the caller and the driver, as the I/O vector no longer needs to be copied back. Also, drivers are now no longer supposed to decide based on the layout of the I/O vector when a transfer should be cut short. Put simply, transfers are now supposed to either succeed completely, or result in an error. After this patch, the state of the various pieces is as follows: - block protocol: stable - libbdev API: stable for synchronous communication - libblockdriver API: needs slight revision (the drvlib/partition API in particular; the threading API will also change shortly) - character protocol: needs cleanup - libchardriver API: needs cleanup accordingly - driver restarts: largely unsupported until endpoint changes are reintroduced As a side effect, this patch eliminates several bugs, hacks, and gcc -Wall and -W warnings all over the place. It probably introduces a few new ones, too. Update warning: this patch changes the protocol between MFS and disk drivers, so in order to use old/new images, the MFS from the ramdisk must be used to mount all file systems.
2011-11-22 13:27:53 +01:00
/* Announce we are up. LWIP announces its presence to VFS just like
* any other character driver.
*/
Split block/character protocols and libdriver This patch separates the character and block driver communication protocols. The old character protocol remains the same, but a new block protocol is introduced. The libdriver library is replaced by two new libraries: libchardriver and libblockdriver. Their exposed API, and drivers that use them, have been updated accordingly. Together, libbdev and libblockdriver now completely abstract away the message format used by the block protocol. As the memory driver is both a character and a block device driver, it now implements its own message loop. The most important semantic change made to the block protocol is that it is no longer possible to return both partial results and an error for a single transfer. This simplifies the interaction between the caller and the driver, as the I/O vector no longer needs to be copied back. Also, drivers are now no longer supposed to decide based on the layout of the I/O vector when a transfer should be cut short. Put simply, transfers are now supposed to either succeed completely, or result in an error. After this patch, the state of the various pieces is as follows: - block protocol: stable - libbdev API: stable for synchronous communication - libblockdriver API: needs slight revision (the drvlib/partition API in particular; the threading API will also change shortly) - character protocol: needs cleanup - libchardriver API: needs cleanup accordingly - driver restarts: largely unsupported until endpoint changes are reintroduced As a side effect, this patch eliminates several bugs, hacks, and gcc -Wall and -W warnings all over the place. It probably introduces a few new ones, too. Update warning: this patch changes the protocol between MFS and disk drivers, so in order to use old/new images, the MFS from the ramdisk must be used to mount all file systems.
2011-11-22 13:27:53 +01:00
chardriver_announce();
return(OK);
}
static void sef_local_startup(void)
{
/* Register init callbacks. */
sef_setcb_init_fresh(sef_cb_init_fresh);
sef_setcb_init_restart(sef_cb_init_fresh);
/* No live update support for now. */
/* Let SEF perform startup. */
sef_startup();
}
static void ds_event(void)
{
char key[DS_MAX_KEYLEN];
const char *driver_prefix = "drv.net.";
char *label;
u32_t value;
int type;
endpoint_t owner_endpoint;
int r;
int prefix_len;
prefix_len = strlen(driver_prefix);
/* We may get one notification for multiple updates from DS. Get events
* and owners from DS, until DS tells us that there are no more.
*/
while ((r = ds_check(key, &type, &owner_endpoint)) == OK) {
r = ds_retrieve_u32(key, &value);
if(r != OK) {
printf("LWIP : ds_event: ds_retrieve_u32 failed\n");
return;
}
/* Only check for network driver up events. */
if(strncmp(key, driver_prefix, prefix_len)
|| value != DS_DRIVER_UP) {
return;
}
/* The driver label comes after the prefix. */
label = key + strlen(driver_prefix);
/* A driver is (re)started. */
driver_up(label, owner_endpoint);
}
if(r != ENOENT)
printf("LWIP : ds_event: ds_check failed: %d\n", r);
}
static void netif_poll_lo(void)
{
if (netif_lo == NULL)
return;
while (netif_lo->loop_first)
netif_poll(netif_lo);
}
void socket_open(message * m)
{
struct sock_ops * ops;
struct socket * sock;
int ret = OK;
switch (m->DEVICE) {
case SOCK_TYPE_TCP:
ops = &sock_tcp_ops;
break;
case SOCK_TYPE_UDP:
ops = &sock_udp_ops;
break;
case SOCK_TYPE_IP:
ops = &sock_raw_ip_ops;
break;
default:
if (m->DEVICE - SOCK_TYPES < MAX_DEVS) {
m->DEVICE -= SOCK_TYPES;
nic_open(m);
return;
}
printf("LWIP unknown socket type %d\n", m->DEVICE);
send_reply_open(m, EINVAL);
return;
}
sock = get_unused_sock();
if (!sock) {
printf("LWIP : no free socket\n");
send_reply_open(m, EAGAIN);
return;
}
sock->ops = ops;
sock->select_ep = NONE;
sock->recv_data_size = 0;
if (sock->ops && sock->ops->open)
ret = sock->ops->open(sock, m);
if (ret == OK) {
debug_print("new socket %ld", get_sock_num(sock));
send_reply_open(m, get_sock_num(sock));
} else {
debug_print("failed %d", ret);
send_reply_open(m, ret);
}
}
int main(__unused int argc, __unused char ** argv)
{
sef_local_startup();
for(;;) {
int err, ipc_status;
message m;
netif_poll_lo();
mq_process();
if ((err = sef_receive_status(ANY, &m, &ipc_status)) != OK) {
printf("LWIP : sef_receive_status errr %d\n", err);
continue;
}
if (m.m_source == VFS_PROC_NR)
socket_request(&m);
else if (is_ipc_notify(ipc_status)) {
switch (m.m_source) {
case CLOCK:
expire_timers(m.NOTIFY_TIMESTAMP);
break;
case DS_PROC_NR:
ds_event();
break;
case PM_PROC_NR:
panic("LWIP : unhandled event from PM");
break;
default:
printf("LWIP : unexpected notify from %d\n",
m.m_source);
continue;
}
} else
/* all other request can be from drivers only */
driver_request(&m);
}
return 0;
}