diff options
| -rw-r--r-- | net/rds/tcp.c | 161 | ||||
| -rw-r--r-- | net/rds/tcp.h | 7 | ||||
| -rw-r--r-- | net/rds/tcp_connect.c | 6 | ||||
| -rw-r--r-- | net/rds/tcp_listen.c | 38 |
4 files changed, 162 insertions, 50 deletions
diff --git a/net/rds/tcp.c b/net/rds/tcp.c index 98f5de3a1c7b..c42b60bf4c68 100644 --- a/net/rds/tcp.c +++ b/net/rds/tcp.c @@ -35,6 +35,9 @@ #include <linux/in.h> #include <linux/module.h> #include <net/tcp.h> +#include <net/net_namespace.h> +#include <net/netns/generic.h> +#include <net/tcp.h> #include "rds.h" #include "tcp.h" @@ -250,16 +253,7 @@ static void rds_tcp_destroy_conns(void) } } -static void rds_tcp_exit(void) -{ - rds_info_deregister_func(RDS_INFO_TCP_SOCKETS, rds_tcp_tc_info); - rds_tcp_listen_stop(); - rds_tcp_destroy_conns(); - rds_trans_unregister(&rds_tcp_transport); - rds_tcp_recv_exit(); - kmem_cache_destroy(rds_tcp_conn_slab); -} -module_exit(rds_tcp_exit); +static void rds_tcp_exit(void); struct rds_transport rds_tcp_transport = { .laddr_check = rds_tcp_laddr_check, @@ -281,6 +275,136 @@ struct rds_transport rds_tcp_transport = { .t_prefer_loopback = 1, }; +static int rds_tcp_netid; + +/* per-network namespace private data for this module */ +struct rds_tcp_net { + struct socket *rds_tcp_listen_sock; + struct work_struct rds_tcp_accept_w; +}; + +static void rds_tcp_accept_worker(struct work_struct *work) +{ + struct rds_tcp_net *rtn = container_of(work, + struct rds_tcp_net, + rds_tcp_accept_w); + + while (rds_tcp_accept_one(rtn->rds_tcp_listen_sock) == 0) + cond_resched(); +} + +void rds_tcp_accept_work(struct sock *sk) +{ + struct net *net = sock_net(sk); + struct rds_tcp_net *rtn = net_generic(net, rds_tcp_netid); + + queue_work(rds_wq, &rtn->rds_tcp_accept_w); +} + +static __net_init int rds_tcp_init_net(struct net *net) +{ + struct rds_tcp_net *rtn = net_generic(net, rds_tcp_netid); + + rtn->rds_tcp_listen_sock = rds_tcp_listen_init(net); + if (!rtn->rds_tcp_listen_sock) { + pr_warn("could not set up listen sock\n"); + return -EAFNOSUPPORT; + } + INIT_WORK(&rtn->rds_tcp_accept_w, rds_tcp_accept_worker); + return 0; +} + +static void __net_exit rds_tcp_exit_net(struct net *net) +{ + struct rds_tcp_net *rtn = net_generic(net, rds_tcp_netid); + + /* If rds_tcp_exit_net() is called as a result of netns deletion, + * the rds_tcp_kill_sock() device notifier would already have cleaned + * up the listen socket, thus there is no work to do in this function. + * + * If rds_tcp_exit_net() is called as a result of module unload, + * i.e., due to rds_tcp_exit() -> unregister_pernet_subsys(), then + * we do need to clean up the listen socket here. + */ + if (rtn->rds_tcp_listen_sock) { + rds_tcp_listen_stop(rtn->rds_tcp_listen_sock); + rtn->rds_tcp_listen_sock = NULL; + flush_work(&rtn->rds_tcp_accept_w); + } +} + +static struct pernet_operations rds_tcp_net_ops = { + .init = rds_tcp_init_net, + .exit = rds_tcp_exit_net, + .id = &rds_tcp_netid, + .size = sizeof(struct rds_tcp_net), +}; + +static void rds_tcp_kill_sock(struct net *net) +{ + struct rds_tcp_connection *tc, *_tc; + struct sock *sk; + LIST_HEAD(tmp_list); + struct rds_tcp_net *rtn = net_generic(net, rds_tcp_netid); + + rds_tcp_listen_stop(rtn->rds_tcp_listen_sock); + rtn->rds_tcp_listen_sock = NULL; + flush_work(&rtn->rds_tcp_accept_w); + spin_lock_irq(&rds_tcp_conn_lock); + list_for_each_entry_safe(tc, _tc, &rds_tcp_conn_list, t_tcp_node) { + struct net *c_net = read_pnet(&tc->conn->c_net); + + if (net != c_net || !tc->t_sock) + continue; + list_move_tail(&tc->t_tcp_node, &tmp_list); + } + spin_unlock_irq(&rds_tcp_conn_lock); + list_for_each_entry_safe(tc, _tc, &tmp_list, t_tcp_node) { + sk = tc->t_sock->sk; + sk->sk_prot->disconnect(sk, 0); + tcp_done(sk); + if (tc->conn->c_passive) + rds_conn_destroy(tc->conn->c_passive); + rds_conn_destroy(tc->conn); + } +} + +static int rds_tcp_dev_event(struct notifier_block *this, + unsigned long event, void *ptr) +{ + struct net_device *dev = netdev_notifier_info_to_dev(ptr); + + /* rds-tcp registers as a pernet subys, so the ->exit will only + * get invoked after network acitivity has quiesced. We need to + * clean up all sockets to quiesce network activity, and use + * the unregistration of the per-net loopback device as a trigger + * to start that cleanup. + */ + if (event == NETDEV_UNREGISTER_FINAL && + dev->ifindex == LOOPBACK_IFINDEX) + rds_tcp_kill_sock(dev_net(dev)); + + return NOTIFY_DONE; +} + +static struct notifier_block rds_tcp_dev_notifier = { + .notifier_call = rds_tcp_dev_event, + .priority = -10, /* must be called after other network notifiers */ +}; + +static void rds_tcp_exit(void) +{ + rds_info_deregister_func(RDS_INFO_TCP_SOCKETS, rds_tcp_tc_info); + unregister_pernet_subsys(&rds_tcp_net_ops); + if (unregister_netdevice_notifier(&rds_tcp_dev_notifier)) + pr_warn("could not unregister rds_tcp_dev_notifier\n"); + rds_tcp_destroy_conns(); + rds_trans_unregister(&rds_tcp_transport); + rds_tcp_recv_exit(); + kmem_cache_destroy(rds_tcp_conn_slab); +} +module_exit(rds_tcp_exit); + static int rds_tcp_init(void) { int ret; @@ -293,6 +417,16 @@ static int rds_tcp_init(void) goto out; } + ret = register_netdevice_notifier(&rds_tcp_dev_notifier); + if (ret) { + pr_warn("could not register rds_tcp_dev_notifier\n"); + goto out; + } + + ret = register_pernet_subsys(&rds_tcp_net_ops); + if (ret) + goto out_slab; + ret = rds_tcp_recv_init(); if (ret) goto out_slab; @@ -301,19 +435,14 @@ static int rds_tcp_init(void) if (ret) goto out_recv; - ret = rds_tcp_listen_init(); - if (ret) - goto out_register; - rds_info_register_func(RDS_INFO_TCP_SOCKETS, rds_tcp_tc_info); goto out; -out_register: - rds_trans_unregister(&rds_tcp_transport); out_recv: rds_tcp_recv_exit(); out_slab: + unregister_pernet_subsys(&rds_tcp_net_ops); kmem_cache_destroy(rds_tcp_conn_slab); out: return ret; diff --git a/net/rds/tcp.h b/net/rds/tcp.h index 0dbdd37162da..64f873c0c6b6 100644 --- a/net/rds/tcp.h +++ b/net/rds/tcp.h @@ -52,6 +52,7 @@ u32 rds_tcp_snd_nxt(struct rds_tcp_connection *tc); u32 rds_tcp_snd_una(struct rds_tcp_connection *tc); u64 rds_tcp_map_seq(struct rds_tcp_connection *tc, u32 seq); extern struct rds_transport rds_tcp_transport; +void rds_tcp_accept_work(struct sock *sk); /* tcp_connect.c */ int rds_tcp_conn_connect(struct rds_connection *conn); @@ -59,9 +60,11 @@ void rds_tcp_conn_shutdown(struct rds_connection *conn); void rds_tcp_state_change(struct sock *sk); /* tcp_listen.c */ -int rds_tcp_listen_init(void); -void rds_tcp_listen_stop(void); +struct socket *rds_tcp_listen_init(struct net *); +void rds_tcp_listen_stop(struct socket *); void rds_tcp_listen_data_ready(struct sock *sk); +int rds_tcp_accept_one(struct socket *sock); +int rds_tcp_keepalive(struct socket *sock); /* tcp_recv.c */ int rds_tcp_recv_init(void); diff --git a/net/rds/tcp_connect.c b/net/rds/tcp_connect.c index 6473b7b377ae..5cb16875c460 100644 --- a/net/rds/tcp_connect.c +++ b/net/rds/tcp_connect.c @@ -112,10 +112,12 @@ int rds_tcp_conn_connect(struct rds_connection *conn) rdsdebug("connect to address %pI4 returned %d\n", &conn->c_faddr, ret); if (ret == -EINPROGRESS) ret = 0; - if (ret == 0) + if (ret == 0) { + rds_tcp_keepalive(sock); sock = NULL; - else + } else { rds_tcp_restore_callbacks(sock, conn->c_transport_data); + } out: if (sock) diff --git a/net/rds/tcp_listen.c b/net/rds/tcp_listen.c index 398ffe5fc1d8..444d78d0bd77 100644 --- a/net/rds/tcp_listen.c +++ b/net/rds/tcp_listen.c @@ -38,14 +38,7 @@ #include "rds.h" #include "tcp.h" -/* - * cheesy, but simple.. - */ -static void rds_tcp_accept_worker(struct work_struct *work); -static DECLARE_WORK(rds_tcp_listen_work, rds_tcp_accept_worker); -static struct socket *rds_tcp_listen_sock; - -static int rds_tcp_keepalive(struct socket *sock) +int rds_tcp_keepalive(struct socket *sock) { /* values below based on xs_udp_default_timeout */ int keepidle = 5; /* send a probe 'keepidle' secs after last data */ @@ -77,7 +70,7 @@ bail: return ret; } -static int rds_tcp_accept_one(struct socket *sock) +int rds_tcp_accept_one(struct socket *sock) { struct socket *new_sock = NULL; struct rds_connection *conn; @@ -150,12 +143,6 @@ out: return ret; } -static void rds_tcp_accept_worker(struct work_struct *work) -{ - while (rds_tcp_accept_one(rds_tcp_listen_sock) == 0) - cond_resched(); -} - void rds_tcp_listen_data_ready(struct sock *sk) { void (*ready)(struct sock *sk); @@ -176,26 +163,20 @@ void rds_tcp_listen_data_ready(struct sock *sk) * socket */ if (sk->sk_state == TCP_LISTEN) - queue_work(rds_wq, &rds_tcp_listen_work); + rds_tcp_accept_work(sk); out: read_unlock(&sk->sk_callback_lock); ready(sk); } -int rds_tcp_listen_init(void) +struct socket *rds_tcp_listen_init(struct net *net) { struct sockaddr_in sin; struct socket *sock = NULL; int ret; - /* MUST call sock_create_kern directly so that we avoid get_net() - * in sk_alloc(). Doing a get_net() will result in cleanup_net() - * never getting invoked, which will leave sock and other things - * in limbo. - */ - ret = sock_create_kern(current->nsproxy->net_ns, PF_INET, - SOCK_STREAM, IPPROTO_TCP, &sock); + ret = sock_create_kern(net, PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock); if (ret < 0) goto out; @@ -219,17 +200,15 @@ int rds_tcp_listen_init(void) if (ret < 0) goto out; - rds_tcp_listen_sock = sock; - sock = NULL; + return sock; out: if (sock) sock_release(sock); - return ret; + return NULL; } -void rds_tcp_listen_stop(void) +void rds_tcp_listen_stop(struct socket *sock) { - struct socket *sock = rds_tcp_listen_sock; struct sock *sk; if (!sock) @@ -250,5 +229,4 @@ void rds_tcp_listen_stop(void) /* wait for accepts to stop and close the socket */ flush_workqueue(rds_wq); sock_release(sock); - rds_tcp_listen_sock = NULL; } |