tipc: separate topology server listener socket from subcsriber sockets
We move the listener socket to struct tipc_server and give it its own work item. This makes it easier to follow the code, and entails some simplifications in the reception code in subscriber sockets. Acked-by: Ying Xue <ying.xue@windriver.com> Signed-off-by: Jon Maloy <jon.maloy@ericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jon Maloy
David S. Miller
Родитель
5c45ab24ac
Коммит
0ef897be12
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@ -64,7 +64,6 @@
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* @tipc_conn_new: callback will be called when new connection is incoming
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* @tipc_conn_release: callback will be called before releasing the connection
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* @tipc_conn_recvmsg: callback will be called when message arrives
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* @saddr: TIPC server address
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* @name: server name
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* @imp: message importance
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* @type: socket type
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@ -74,10 +73,11 @@ struct tipc_server {
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spinlock_t idr_lock; /* for idr list */
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int idr_in_use;
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struct net *net;
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struct work_struct awork;
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struct workqueue_struct *rcv_wq;
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struct workqueue_struct *send_wq;
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int max_rcvbuf_size;
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struct sockaddr_tipc *saddr;
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struct socket *listener;
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char name[TIPC_SERVER_NAME_LEN];
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};
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@ -106,7 +106,6 @@ struct tipc_conn {
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struct list_head sub_list;
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spinlock_t sub_lock; /* for subscription list */
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struct work_struct rwork;
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int (*rx_action) (struct tipc_conn *con);
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struct list_head outqueue;
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spinlock_t outqueue_lock;
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struct work_struct swork;
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@ -121,12 +120,6 @@ struct outqueue_entry {
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static void tipc_recv_work(struct work_struct *work);
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static void tipc_send_work(struct work_struct *work);
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static void tipc_clean_outqueues(struct tipc_conn *con);
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static struct tipc_conn *sock2con(struct sock *sk)
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{
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return sk->sk_user_data;
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}
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static bool connected(struct tipc_conn *con)
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{
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@ -137,21 +130,21 @@ static void tipc_conn_kref_release(struct kref *kref)
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{
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struct tipc_conn *con = container_of(kref, struct tipc_conn, kref);
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struct tipc_server *s = con->server;
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struct socket *sock = con->sock;
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struct outqueue_entry *e, *safe;
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if (sock) {
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if (test_bit(CF_SERVER, &con->flags)) {
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__module_get(sock->ops->owner);
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__module_get(sock->sk->sk_prot_creator->owner);
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}
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sock_release(sock);
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con->sock = NULL;
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}
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spin_lock_bh(&s->idr_lock);
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idr_remove(&s->conn_idr, con->conid);
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s->idr_in_use--;
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spin_unlock_bh(&s->idr_lock);
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tipc_clean_outqueues(con);
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if (con->sock)
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sock_release(con->sock);
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spin_lock_bh(&con->outqueue_lock);
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list_for_each_entry_safe(e, safe, &con->outqueue, list) {
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list_del(&e->list);
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kfree(e);
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}
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spin_unlock_bh(&con->outqueue_lock);
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kfree(con);
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}
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@ -178,14 +171,14 @@ static struct tipc_conn *tipc_conn_lookup(struct tipc_server *s, int conid)
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}
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/* sock_data_ready - interrupt callback indicating the socket has data to read
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* The queued job is launched in tipc_recv_from_sock()
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* The queued work is launched into tipc_recv_work()->tipc_recv_from_sock()
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*/
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static void sock_data_ready(struct sock *sk)
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{
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struct tipc_conn *con;
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read_lock_bh(&sk->sk_callback_lock);
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con = sock2con(sk);
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con = sk->sk_user_data;
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if (connected(con)) {
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conn_get(con);
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if (!queue_work(con->server->rcv_wq, &con->rwork))
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@ -195,15 +188,15 @@ static void sock_data_ready(struct sock *sk)
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}
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/* sock_write_space - interrupt callback after a sendmsg EAGAIN
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* Indicates that there now is more is space in the send buffer
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* The queued job is launched in tipc_send_to_sock()
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* Indicates that there now is more space in the send buffer
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* The queued work is launched into tipc_send_work()->tipc_send_to_sock()
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*/
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static void sock_write_space(struct sock *sk)
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{
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struct tipc_conn *con;
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read_lock_bh(&sk->sk_callback_lock);
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con = sock2con(sk);
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con = sk->sk_user_data;
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if (connected(con)) {
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conn_get(con);
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if (!queue_work(con->server->send_wq, &con->swork))
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@ -212,23 +205,8 @@ static void sock_write_space(struct sock *sk)
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read_unlock_bh(&sk->sk_callback_lock);
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}
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static void tipc_register_callbacks(struct socket *sock, struct tipc_conn *con)
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{
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struct sock *sk = sock->sk;
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write_lock_bh(&sk->sk_callback_lock);
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sk->sk_data_ready = sock_data_ready;
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sk->sk_write_space = sock_write_space;
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sk->sk_user_data = con;
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con->sock = sock;
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write_unlock_bh(&sk->sk_callback_lock);
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}
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/* tipc_con_delete_sub - delete a specific or all subscriptions
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* for a given subscriber
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* for a given subscriber
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*/
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static void tipc_con_delete_sub(struct tipc_conn *con, struct tipc_subscr *s)
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{
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@ -268,6 +246,7 @@ static void tipc_close_conn(struct tipc_conn *con)
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/* Don't flush pending works, -just let them expire */
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kernel_sock_shutdown(con->sock, SHUT_RDWR);
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conn_put(con);
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}
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@ -357,117 +336,8 @@ static int tipc_receive_from_sock(struct tipc_conn *con)
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return ret;
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}
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static int tipc_accept_from_sock(struct tipc_conn *con)
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{
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struct socket *sock = con->sock;
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struct socket *newsock;
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struct tipc_conn *newcon;
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int ret;
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ret = kernel_accept(sock, &newsock, O_NONBLOCK);
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if (ret < 0)
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return ret;
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newcon = tipc_alloc_conn(con->server);
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if (IS_ERR(newcon)) {
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ret = PTR_ERR(newcon);
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sock_release(newsock);
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return ret;
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}
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newcon->rx_action = tipc_receive_from_sock;
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tipc_register_callbacks(newsock, newcon);
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/* Wake up receive process in case of 'SYN+' message */
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newsock->sk->sk_data_ready(newsock->sk);
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return ret;
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}
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static struct socket *tipc_create_listen_sock(struct tipc_conn *con)
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{
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struct tipc_server *s = con->server;
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struct socket *sock = NULL;
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int imp = TIPC_CRITICAL_IMPORTANCE;
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int ret;
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ret = sock_create_kern(s->net, AF_TIPC, SOCK_SEQPACKET, 0, &sock);
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if (ret < 0)
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return NULL;
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ret = kernel_setsockopt(sock, SOL_TIPC, TIPC_IMPORTANCE,
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(char *)&imp, sizeof(imp));
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if (ret < 0)
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goto create_err;
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ret = kernel_bind(sock, (struct sockaddr *)s->saddr, sizeof(*s->saddr));
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if (ret < 0)
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goto create_err;
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con->rx_action = tipc_accept_from_sock;
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ret = kernel_listen(sock, 0);
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if (ret < 0)
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goto create_err;
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/* As server's listening socket owner and creator is the same module,
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* we have to decrease TIPC module reference count to guarantee that
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* it remains zero after the server socket is created, otherwise,
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* executing "rmmod" command is unable to make TIPC module deleted
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* after TIPC module is inserted successfully.
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*
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* However, the reference count is ever increased twice in
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* sock_create_kern(): one is to increase the reference count of owner
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* of TIPC socket's proto_ops struct; another is to increment the
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* reference count of owner of TIPC proto struct. Therefore, we must
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* decrement the module reference count twice to ensure that it keeps
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* zero after server's listening socket is created. Of course, we
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* must bump the module reference count twice as well before the socket
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* is closed.
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*/
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module_put(sock->ops->owner);
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module_put(sock->sk->sk_prot_creator->owner);
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set_bit(CF_SERVER, &con->flags);
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return sock;
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create_err:
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kernel_sock_shutdown(sock, SHUT_RDWR);
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sock_release(sock);
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return NULL;
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}
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static int tipc_open_listening_sock(struct tipc_server *s)
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{
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struct socket *sock;
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struct tipc_conn *con;
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con = tipc_alloc_conn(s);
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if (IS_ERR(con))
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return PTR_ERR(con);
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sock = tipc_create_listen_sock(con);
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if (!sock) {
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idr_remove(&s->conn_idr, con->conid);
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s->idr_in_use--;
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kfree(con);
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return -EINVAL;
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}
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tipc_register_callbacks(sock, con);
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return 0;
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}
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static void tipc_clean_outqueues(struct tipc_conn *con)
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{
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struct outqueue_entry *e, *safe;
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spin_lock_bh(&con->outqueue_lock);
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list_for_each_entry_safe(e, safe, &con->outqueue, list) {
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list_del(&e->list);
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kfree(e);
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}
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spin_unlock_bh(&con->outqueue_lock);
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}
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/* tipc_conn_queue_evt - interrupt level call from a subscription instance
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* The queued job is launched in tipc_send_to_sock()
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/* tipc_conn_queue_evt() - interrupt level call from a subscription instance
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* The queued work is launched into tipc_send_work()->tipc_send_to_sock()
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*/
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void tipc_conn_queue_evt(struct net *net, int conid,
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u32 event, struct tipc_event *evt)
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@ -588,9 +458,9 @@ static void tipc_send_to_sock(struct tipc_conn *con)
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1, sizeof(*evt));
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if (ret == -EWOULDBLOCK || ret == 0) {
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cond_resched();
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goto out;
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return;
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} else if (ret < 0) {
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goto err;
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return tipc_close_conn(con);
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}
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} else {
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tipc_send_kern_top_evt(srv->net, evt);
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@ -606,10 +476,6 @@ static void tipc_send_to_sock(struct tipc_conn *con)
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kfree(e);
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}
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spin_unlock_bh(&con->outqueue_lock);
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out:
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return;
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err:
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tipc_close_conn(con);
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}
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static void tipc_recv_work(struct work_struct *work)
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@ -618,7 +484,7 @@ static void tipc_recv_work(struct work_struct *work)
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int count = 0;
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while (connected(con)) {
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if (con->rx_action(con))
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if (tipc_receive_from_sock(con))
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break;
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/* Don't flood Rx machine */
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@ -640,10 +506,113 @@ static void tipc_send_work(struct work_struct *work)
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conn_put(con);
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}
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static void tipc_work_stop(struct tipc_server *s)
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static void tipc_accept_from_sock(struct work_struct *work)
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{
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destroy_workqueue(s->rcv_wq);
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destroy_workqueue(s->send_wq);
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struct tipc_server *srv = container_of(work, struct tipc_server, awork);
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struct socket *lsock = srv->listener;
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struct socket *newsock;
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struct tipc_conn *con;
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struct sock *newsk;
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int ret;
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while (1) {
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ret = kernel_accept(lsock, &newsock, O_NONBLOCK);
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if (ret < 0)
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return;
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con = tipc_alloc_conn(srv);
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if (IS_ERR(con)) {
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ret = PTR_ERR(con);
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sock_release(newsock);
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return;
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}
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/* Register callbacks */
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newsk = newsock->sk;
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write_lock_bh(&newsk->sk_callback_lock);
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newsk->sk_data_ready = sock_data_ready;
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newsk->sk_write_space = sock_write_space;
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newsk->sk_user_data = con;
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con->sock = newsock;
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write_unlock_bh(&newsk->sk_callback_lock);
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/* Wake up receive process in case of 'SYN+' message */
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newsk->sk_data_ready(newsk);
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}
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}
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/* listener_sock_data_ready - interrupt callback indicating new connection
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* The queued job is launched into tipc_accept_from_sock()
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*/
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static void listener_sock_data_ready(struct sock *sk)
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{
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struct tipc_server *srv;
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read_lock_bh(&sk->sk_callback_lock);
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srv = sk->sk_user_data;
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if (srv->listener)
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queue_work(srv->rcv_wq, &srv->awork);
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read_unlock_bh(&sk->sk_callback_lock);
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}
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static int tipc_create_listener_sock(struct tipc_server *srv)
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{
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int imp = TIPC_CRITICAL_IMPORTANCE;
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struct socket *lsock = NULL;
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struct sockaddr_tipc saddr;
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struct sock *sk;
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int rc;
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|
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rc = sock_create_kern(srv->net, AF_TIPC, SOCK_SEQPACKET, 0, &lsock);
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if (rc < 0)
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return rc;
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srv->listener = lsock;
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sk = lsock->sk;
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write_lock_bh(&sk->sk_callback_lock);
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sk->sk_data_ready = listener_sock_data_ready;
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sk->sk_user_data = srv;
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write_unlock_bh(&sk->sk_callback_lock);
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rc = kernel_setsockopt(lsock, SOL_TIPC, TIPC_IMPORTANCE,
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(char *)&imp, sizeof(imp));
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if (rc < 0)
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goto err;
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|
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saddr.family = AF_TIPC;
|
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saddr.addrtype = TIPC_ADDR_NAMESEQ;
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saddr.addr.nameseq.type = TIPC_TOP_SRV;
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saddr.addr.nameseq.lower = TIPC_TOP_SRV;
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saddr.addr.nameseq.upper = TIPC_TOP_SRV;
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saddr.scope = TIPC_NODE_SCOPE;
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rc = kernel_bind(lsock, (struct sockaddr *)&saddr, sizeof(saddr));
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if (rc < 0)
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goto err;
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rc = kernel_listen(lsock, 0);
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if (rc < 0)
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goto err;
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|
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/* As server's listening socket owner and creator is the same module,
|
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* we have to decrease TIPC module reference count to guarantee that
|
||||
* it remains zero after the server socket is created, otherwise,
|
||||
* executing "rmmod" command is unable to make TIPC module deleted
|
||||
* after TIPC module is inserted successfully.
|
||||
*
|
||||
* However, the reference count is ever increased twice in
|
||||
* sock_create_kern(): one is to increase the reference count of owner
|
||||
* of TIPC socket's proto_ops struct; another is to increment the
|
||||
* reference count of owner of TIPC proto struct. Therefore, we must
|
||||
* decrement the module reference count twice to ensure that it keeps
|
||||
* zero after server's listening socket is created. Of course, we
|
||||
* must bump the module reference count twice as well before the socket
|
||||
* is closed.
|
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*/
|
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module_put(lsock->ops->owner);
|
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module_put(sk->sk_prot_creator->owner);
|
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|
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return 0;
|
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err:
|
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sock_release(lsock);
|
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return -EINVAL;
|
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}
|
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|
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static int tipc_work_start(struct tipc_server *s)
|
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|
|
@ -664,32 +633,26 @@ static int tipc_work_start(struct tipc_server *s)
|
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return 0;
|
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}
|
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|
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static void tipc_work_stop(struct tipc_server *s)
|
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{
|
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destroy_workqueue(s->rcv_wq);
|
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destroy_workqueue(s->send_wq);
|
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}
|
||||
|
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int tipc_topsrv_start(struct net *net)
|
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{
|
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struct tipc_net *tn = tipc_net(net);
|
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const char name[] = "topology_server";
|
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struct sockaddr_tipc *saddr;
|
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struct tipc_server *srv;
|
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int ret;
|
||||
|
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saddr = kzalloc(sizeof(*saddr), GFP_ATOMIC);
|
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if (!saddr)
|
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return -ENOMEM;
|
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saddr->family = AF_TIPC;
|
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saddr->addrtype = TIPC_ADDR_NAMESEQ;
|
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saddr->addr.nameseq.type = TIPC_TOP_SRV;
|
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saddr->addr.nameseq.lower = TIPC_TOP_SRV;
|
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saddr->addr.nameseq.upper = TIPC_TOP_SRV;
|
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saddr->scope = TIPC_NODE_SCOPE;
|
||||
|
||||
srv = kzalloc(sizeof(*srv), GFP_ATOMIC);
|
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if (!srv) {
|
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kfree(saddr);
|
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if (!srv)
|
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return -ENOMEM;
|
||||
}
|
||||
srv->net = net;
|
||||
srv->saddr = saddr;
|
||||
srv->max_rcvbuf_size = sizeof(struct tipc_subscr);
|
||||
|
||||
srv->net = net;
|
||||
srv->max_rcvbuf_size = sizeof(struct tipc_subscr);
|
||||
INIT_WORK(&srv->awork, tipc_accept_from_sock);
|
||||
|
||||
strncpy(srv->name, name, strlen(name) + 1);
|
||||
tn->topsrv = srv;
|
||||
|
|
@ -703,7 +666,7 @@ int tipc_topsrv_start(struct net *net)
|
|||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
ret = tipc_open_listening_sock(srv);
|
||||
ret = tipc_create_listener_sock(srv);
|
||||
if (ret < 0)
|
||||
tipc_work_stop(srv);
|
||||
|
||||
|
|
@ -713,6 +676,7 @@ int tipc_topsrv_start(struct net *net)
|
|||
void tipc_topsrv_stop(struct net *net)
|
||||
{
|
||||
struct tipc_server *srv = tipc_topsrv(net);
|
||||
struct socket *lsock = srv->listener;
|
||||
struct tipc_conn *con;
|
||||
int id;
|
||||
|
||||
|
|
@ -725,10 +689,12 @@ void tipc_topsrv_stop(struct net *net)
|
|||
spin_lock_bh(&srv->idr_lock);
|
||||
}
|
||||
}
|
||||
__module_get(lsock->ops->owner);
|
||||
__module_get(lsock->sk->sk_prot_creator->owner);
|
||||
sock_release(lsock);
|
||||
srv->listener = NULL;
|
||||
spin_unlock_bh(&srv->idr_lock);
|
||||
|
||||
tipc_work_stop(srv);
|
||||
idr_destroy(&srv->conn_idr);
|
||||
kfree(srv->saddr);
|
||||
kfree(srv);
|
||||
}
|
||||
|
|
|
|||
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