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server.c
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server.c
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#include "server.h"
#include "con.h"
struct kmem_cache *g_con_cache;
struct kmem_cache *g_target_con_cache;
struct kmem_cache *g_con_buf_cache;
void tlb_server_unlink_con(struct tlb_server *srv, struct tlb_con *con)
{
spin_lock(&srv->con_list_lock);
list_del_init(&con->list_entry);
spin_unlock(&srv->con_list_lock);
}
static int tlb_server_listen_thread_routine(void *arg)
{
struct tlb_server *srv = (struct tlb_server *)arg;
struct socket *sock;
struct ksock_callbacks callbacks;
struct tlb_con *con;
int r;
while (!kthread_should_stop() && srv->state != TLB_SRV_STOPPING) {
con = tlb_con_create(srv);
if (!con)
break;
callbacks.user_data = con;
callbacks.state_change = tlb_con_state_change;
callbacks.data_ready = tlb_con_data_ready;
callbacks.write_space = tlb_con_write_space;
r = ksock_accept(&sock, srv->listen_sock, &callbacks);
if (r) {
pr_err("tlb: accept r %d\n", r);
tlb_con_delete(con);
continue;
}
con->start_time = ktime_get();
spin_lock(&srv->con_list_lock);
list_add_tail(&con->list_entry, &srv->con_list);
spin_unlock(&srv->con_list_lock);
tlb_con_start(con, sock);
}
srv->listen_thread_stopping = true;
return 0;
}
int tlb_server_init(struct tlb_server *srv)
{
mutex_init(&srv->lock);
srv->state = TLB_SRV_INITED;
return 0;
}
int tlb_server_start(struct tlb_server *srv, const char *host, int port)
{
int r, i;
unsigned int cpu;
struct sockaddr_storage addr;
if (strlen(host) >= ARRAY_SIZE(srv->host) || port <= 0 || port > 65535)
return -EINVAL;
r = ksock_resolve_addr(host, port, &addr);
if (r)
return r;
mutex_lock(&srv->lock);
if (srv->state != TLB_SRV_INITED) {
r = -EEXIST;
goto unlock;
}
srv->state = TLB_SRV_STARTING;
srv->nr_con_thread = 0;
atomic_set(&srv->next_con_thread, 0);
tlb_server_init_targets(srv);
snprintf(srv->host, ARRAY_SIZE(srv->host), "%s", host);
srv->port = port;
INIT_LIST_HEAD(&srv->con_list);
spin_lock_init(&srv->con_list_lock);
for (i = 0; i < 5; i++) {
r = ksock_listen_addr(&srv->listen_sock, &addr, SOMAXCONN);
if (r) {
pr_err("tlb: ksock_listen r %d\n", r);
if (r == -EADDRINUSE) {
msleep_interruptible(100);
continue;
}
} else
break;
}
if (r)
goto deinit_targets;
for_each_cpu(cpu, cpu_online_mask) {
r = coroutine_thread_start(&srv->con_thread[srv->nr_con_thread], "tlb_coroutine", cpu);
if (r)
goto stop_con_coroutine;
srv->nr_con_thread++;
}
srv->listen_thread = kthread_create(tlb_server_listen_thread_routine, srv, "tlb_listen");
if (IS_ERR(srv->listen_thread)) {
r = PTR_ERR(srv->listen_thread);
goto stop_con_coroutine;
}
get_task_struct(srv->listen_thread);
wake_up_process(srv->listen_thread);
srv->state = TLB_SRV_RUNNING;
mutex_unlock(&srv->lock);
return 0;
stop_con_coroutine:
for (i = 0; i < srv->nr_con_thread; i++)
coroutine_thread_stop(&srv->con_thread[i]);
ksock_release(srv->listen_sock);
deinit_targets:
tlb_server_deinit_targets(srv);
srv->state = TLB_SRV_INITED;
unlock:
mutex_unlock(&srv->lock);
return r;
}
int tlb_server_stop(struct tlb_server *srv)
{
struct tlb_con *con, *tmp;
int i;
mutex_lock(&srv->lock);
if (srv->state != TLB_SRV_RUNNING) {
mutex_unlock(&srv->lock);
return -ENOENT;
}
srv->state = TLB_SRV_STOPPING;
while (!srv->listen_thread_stopping) {
ksock_abort_accept(srv->listen_sock);
msleep_interruptible(100);
}
kthread_stop(srv->listen_thread);
put_task_struct(srv->listen_thread);
srv->listen_thread_stopping = false;
for (i = 0; i < srv->nr_con_thread; i++)
coroutine_thread_stop(&srv->con_thread[i]);
ksock_release(srv->listen_sock);
list_for_each_entry_safe(con, tmp, &srv->con_list, list_entry) {
list_del_init(&con->list_entry);
tlb_con_delete(con);
}
tlb_server_deinit_targets(srv);
srv->state = TLB_SRV_INITED;
mutex_unlock(&srv->lock);
return 0;
}
int tlb_server_cache_init(void)
{
g_con_cache = kmem_cache_create("tlb_con_cache", sizeof(struct tlb_con), 0, 0, NULL);
if (!g_con_cache)
return -ENOMEM;
g_target_con_cache = kmem_cache_create("tlb_target_con_cache", sizeof(struct tlb_target_con), 0, 0, NULL);
if (!g_target_con_cache) {
kmem_cache_destroy(g_con_cache);
return -ENOMEM;
}
g_con_buf_cache = kmem_cache_create("tlb_con_buf_cache", TLB_CON_BUF_SIZE, 0, 0, NULL);
if (!g_con_buf_cache) {
kmem_cache_destroy(g_target_con_cache);
kmem_cache_destroy(g_con_cache);
return -ENOMEM;
}
return 0;
}
void tlb_server_cache_deinit(void)
{
kmem_cache_destroy(g_con_buf_cache);
kmem_cache_destroy(g_target_con_cache);
kmem_cache_destroy(g_con_cache);
}