| /* -*- mode: c; c-basic-offset: 8; -*- |
| * |
| * vim: noexpandtab sw=8 ts=8 sts=0: |
| * |
| * Copyright (C) 2004 Oracle. All rights reserved. |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public |
| * License as published by the Free Software Foundation; either |
| * version 2 of the License, or (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public |
| * License along with this program; if not, write to the |
| * Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
| * Boston, MA 021110-1307, USA. |
| * |
| * ---- |
| * |
| * Callers for this were originally written against a very simple synchronus |
| * API. This implementation reflects those simple callers. Some day I'm sure |
| * we'll need to move to a more robust posting/callback mechanism. |
| * |
| * Transmit calls pass in kernel virtual addresses and block copying this into |
| * the socket's tx buffers via a usual blocking sendmsg. They'll block waiting |
| * for a failed socket to timeout. TX callers can also pass in a poniter to an |
| * 'int' which gets filled with an errno off the wire in response to the |
| * message they send. |
| * |
| * Handlers for unsolicited messages are registered. Each socket has a page |
| * that incoming data is copied into. First the header, then the data. |
| * Handlers are called from only one thread with a reference to this per-socket |
| * page. This page is destroyed after the handler call, so it can't be |
| * referenced beyond the call. Handlers may block but are discouraged from |
| * doing so. |
| * |
| * Any framing errors (bad magic, large payload lengths) close a connection. |
| * |
| * Our sock_container holds the state we associate with a socket. It's current |
| * framing state is held there as well as the refcounting we do around when it |
| * is safe to tear down the socket. The socket is only finally torn down from |
| * the container when the container loses all of its references -- so as long |
| * as you hold a ref on the container you can trust that the socket is valid |
| * for use with kernel socket APIs. |
| * |
| * Connections are initiated between a pair of nodes when the node with the |
| * higher node number gets a heartbeat callback which indicates that the lower |
| * numbered node has started heartbeating. The lower numbered node is passive |
| * and only accepts the connection if the higher numbered node is heartbeating. |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/jiffies.h> |
| #include <linux/slab.h> |
| #include <linux/idr.h> |
| #include <linux/kref.h> |
| #include <linux/net.h> |
| #include <linux/export.h> |
| #include <net/tcp.h> |
| |
| #include <asm/uaccess.h> |
| |
| #include "heartbeat.h" |
| #include "tcp.h" |
| #include "nodemanager.h" |
| #define MLOG_MASK_PREFIX ML_TCP |
| #include "masklog.h" |
| #include "quorum.h" |
| |
| #include "tcp_internal.h" |
| |
| #define SC_NODEF_FMT "node %s (num %u) at %pI4:%u" |
| #define SC_NODEF_ARGS(sc) sc->sc_node->nd_name, sc->sc_node->nd_num, \ |
| &sc->sc_node->nd_ipv4_address, \ |
| ntohs(sc->sc_node->nd_ipv4_port) |
| |
| /* |
| * In the following two log macros, the whitespace after the ',' just |
| * before ##args is intentional. Otherwise, gcc 2.95 will eat the |
| * previous token if args expands to nothing. |
| */ |
| #define msglog(hdr, fmt, args...) do { \ |
| typeof(hdr) __hdr = (hdr); \ |
| mlog(ML_MSG, "[mag %u len %u typ %u stat %d sys_stat %d " \ |
| "key %08x num %u] " fmt, \ |
| be16_to_cpu(__hdr->magic), be16_to_cpu(__hdr->data_len), \ |
| be16_to_cpu(__hdr->msg_type), be32_to_cpu(__hdr->status), \ |
| be32_to_cpu(__hdr->sys_status), be32_to_cpu(__hdr->key), \ |
| be32_to_cpu(__hdr->msg_num) , ##args); \ |
| } while (0) |
| |
| #define sclog(sc, fmt, args...) do { \ |
| typeof(sc) __sc = (sc); \ |
| mlog(ML_SOCKET, "[sc %p refs %d sock %p node %u page %p " \ |
| "pg_off %zu] " fmt, __sc, \ |
| atomic_read(&__sc->sc_kref.refcount), __sc->sc_sock, \ |
| __sc->sc_node->nd_num, __sc->sc_page, __sc->sc_page_off , \ |
| ##args); \ |
| } while (0) |
| |
| static DEFINE_RWLOCK(o2net_handler_lock); |
| static struct rb_root o2net_handler_tree = RB_ROOT; |
| |
| static struct o2net_node o2net_nodes[O2NM_MAX_NODES]; |
| |
| /* XXX someday we'll need better accounting */ |
| static struct socket *o2net_listen_sock; |
| |
| /* |
| * listen work is only queued by the listening socket callbacks on the |
| * o2net_wq. teardown detaches the callbacks before destroying the workqueue. |
| * quorum work is queued as sock containers are shutdown.. stop_listening |
| * tears down all the node's sock containers, preventing future shutdowns |
| * and queued quroum work, before canceling delayed quorum work and |
| * destroying the work queue. |
| */ |
| static struct workqueue_struct *o2net_wq; |
| static struct work_struct o2net_listen_work; |
| |
| static struct o2hb_callback_func o2net_hb_up, o2net_hb_down; |
| #define O2NET_HB_PRI 0x1 |
| |
| static struct o2net_handshake *o2net_hand; |
| static struct o2net_msg *o2net_keep_req, *o2net_keep_resp; |
| |
| static int o2net_sys_err_translations[O2NET_ERR_MAX] = |
| {[O2NET_ERR_NONE] = 0, |
| [O2NET_ERR_NO_HNDLR] = -ENOPROTOOPT, |
| [O2NET_ERR_OVERFLOW] = -EOVERFLOW, |
| [O2NET_ERR_DIED] = -EHOSTDOWN,}; |
| |
| /* can't quite avoid *all* internal declarations :/ */ |
| static void o2net_sc_connect_completed(struct work_struct *work); |
| static void o2net_rx_until_empty(struct work_struct *work); |
| static void o2net_shutdown_sc(struct work_struct *work); |
| static void o2net_listen_data_ready(struct sock *sk); |
| static void o2net_sc_send_keep_req(struct work_struct *work); |
| static void o2net_idle_timer(unsigned long data); |
| static void o2net_sc_postpone_idle(struct o2net_sock_container *sc); |
| static void o2net_sc_reset_idle_timer(struct o2net_sock_container *sc); |
| |
| #ifdef CONFIG_DEBUG_FS |
| static void o2net_init_nst(struct o2net_send_tracking *nst, u32 msgtype, |
| u32 msgkey, struct task_struct *task, u8 node) |
| { |
| INIT_LIST_HEAD(&nst->st_net_debug_item); |
| nst->st_task = task; |
| nst->st_msg_type = msgtype; |
| nst->st_msg_key = msgkey; |
| nst->st_node = node; |
| } |
| |
| static inline void o2net_set_nst_sock_time(struct o2net_send_tracking *nst) |
| { |
| nst->st_sock_time = ktime_get(); |
| } |
| |
| static inline void o2net_set_nst_send_time(struct o2net_send_tracking *nst) |
| { |
| nst->st_send_time = ktime_get(); |
| } |
| |
| static inline void o2net_set_nst_status_time(struct o2net_send_tracking *nst) |
| { |
| nst->st_status_time = ktime_get(); |
| } |
| |
| static inline void o2net_set_nst_sock_container(struct o2net_send_tracking *nst, |
| struct o2net_sock_container *sc) |
| { |
| nst->st_sc = sc; |
| } |
| |
| static inline void o2net_set_nst_msg_id(struct o2net_send_tracking *nst, |
| u32 msg_id) |
| { |
| nst->st_id = msg_id; |
| } |
| |
| static inline void o2net_set_sock_timer(struct o2net_sock_container *sc) |
| { |
| sc->sc_tv_timer = ktime_get(); |
| } |
| |
| static inline void o2net_set_data_ready_time(struct o2net_sock_container *sc) |
| { |
| sc->sc_tv_data_ready = ktime_get(); |
| } |
| |
| static inline void o2net_set_advance_start_time(struct o2net_sock_container *sc) |
| { |
| sc->sc_tv_advance_start = ktime_get(); |
| } |
| |
| static inline void o2net_set_advance_stop_time(struct o2net_sock_container *sc) |
| { |
| sc->sc_tv_advance_stop = ktime_get(); |
| } |
| |
| static inline void o2net_set_func_start_time(struct o2net_sock_container *sc) |
| { |
| sc->sc_tv_func_start = ktime_get(); |
| } |
| |
| static inline void o2net_set_func_stop_time(struct o2net_sock_container *sc) |
| { |
| sc->sc_tv_func_stop = ktime_get(); |
| } |
| |
| #else /* CONFIG_DEBUG_FS */ |
| # define o2net_init_nst(a, b, c, d, e) |
| # define o2net_set_nst_sock_time(a) |
| # define o2net_set_nst_send_time(a) |
| # define o2net_set_nst_status_time(a) |
| # define o2net_set_nst_sock_container(a, b) |
| # define o2net_set_nst_msg_id(a, b) |
| # define o2net_set_sock_timer(a) |
| # define o2net_set_data_ready_time(a) |
| # define o2net_set_advance_start_time(a) |
| # define o2net_set_advance_stop_time(a) |
| # define o2net_set_func_start_time(a) |
| # define o2net_set_func_stop_time(a) |
| #endif /* CONFIG_DEBUG_FS */ |
| |
| #ifdef CONFIG_OCFS2_FS_STATS |
| static ktime_t o2net_get_func_run_time(struct o2net_sock_container *sc) |
| { |
| return ktime_sub(sc->sc_tv_func_stop, sc->sc_tv_func_start); |
| } |
| |
| static void o2net_update_send_stats(struct o2net_send_tracking *nst, |
| struct o2net_sock_container *sc) |
| { |
| sc->sc_tv_status_total = ktime_add(sc->sc_tv_status_total, |
| ktime_sub(ktime_get(), |
| nst->st_status_time)); |
| sc->sc_tv_send_total = ktime_add(sc->sc_tv_send_total, |
| ktime_sub(nst->st_status_time, |
| nst->st_send_time)); |
| sc->sc_tv_acquiry_total = ktime_add(sc->sc_tv_acquiry_total, |
| ktime_sub(nst->st_send_time, |
| nst->st_sock_time)); |
| sc->sc_send_count++; |
| } |
| |
| static void o2net_update_recv_stats(struct o2net_sock_container *sc) |
| { |
| sc->sc_tv_process_total = ktime_add(sc->sc_tv_process_total, |
| o2net_get_func_run_time(sc)); |
| sc->sc_recv_count++; |
| } |
| |
| #else |
| |
| # define o2net_update_send_stats(a, b) |
| |
| # define o2net_update_recv_stats(sc) |
| |
| #endif /* CONFIG_OCFS2_FS_STATS */ |
| |
| static inline unsigned int o2net_reconnect_delay(void) |
| { |
| return o2nm_single_cluster->cl_reconnect_delay_ms; |
| } |
| |
| static inline unsigned int o2net_keepalive_delay(void) |
| { |
| return o2nm_single_cluster->cl_keepalive_delay_ms; |
| } |
| |
| static inline unsigned int o2net_idle_timeout(void) |
| { |
| return o2nm_single_cluster->cl_idle_timeout_ms; |
| } |
| |
| static inline int o2net_sys_err_to_errno(enum o2net_system_error err) |
| { |
| int trans; |
| BUG_ON(err >= O2NET_ERR_MAX); |
| trans = o2net_sys_err_translations[err]; |
| |
| /* Just in case we mess up the translation table above */ |
| BUG_ON(err != O2NET_ERR_NONE && trans == 0); |
| return trans; |
| } |
| |
| static struct o2net_node * o2net_nn_from_num(u8 node_num) |
| { |
| BUG_ON(node_num >= ARRAY_SIZE(o2net_nodes)); |
| return &o2net_nodes[node_num]; |
| } |
| |
| static u8 o2net_num_from_nn(struct o2net_node *nn) |
| { |
| BUG_ON(nn == NULL); |
| return nn - o2net_nodes; |
| } |
| |
| /* ------------------------------------------------------------ */ |
| |
| static int o2net_prep_nsw(struct o2net_node *nn, struct o2net_status_wait *nsw) |
| { |
| int ret; |
| |
| spin_lock(&nn->nn_lock); |
| ret = idr_alloc(&nn->nn_status_idr, nsw, 0, 0, GFP_ATOMIC); |
| if (ret >= 0) { |
| nsw->ns_id = ret; |
| list_add_tail(&nsw->ns_node_item, &nn->nn_status_list); |
| } |
| spin_unlock(&nn->nn_lock); |
| if (ret < 0) |
| return ret; |
| |
| init_waitqueue_head(&nsw->ns_wq); |
| nsw->ns_sys_status = O2NET_ERR_NONE; |
| nsw->ns_status = 0; |
| return 0; |
| } |
| |
| static void o2net_complete_nsw_locked(struct o2net_node *nn, |
| struct o2net_status_wait *nsw, |
| enum o2net_system_error sys_status, |
| s32 status) |
| { |
| assert_spin_locked(&nn->nn_lock); |
| |
| if (!list_empty(&nsw->ns_node_item)) { |
| list_del_init(&nsw->ns_node_item); |
| nsw->ns_sys_status = sys_status; |
| nsw->ns_status = status; |
| idr_remove(&nn->nn_status_idr, nsw->ns_id); |
| wake_up(&nsw->ns_wq); |
| } |
| } |
| |
| static void o2net_complete_nsw(struct o2net_node *nn, |
| struct o2net_status_wait *nsw, |
| u64 id, enum o2net_system_error sys_status, |
| s32 status) |
| { |
| spin_lock(&nn->nn_lock); |
| if (nsw == NULL) { |
| if (id > INT_MAX) |
| goto out; |
| |
| nsw = idr_find(&nn->nn_status_idr, id); |
| if (nsw == NULL) |
| goto out; |
| } |
| |
| o2net_complete_nsw_locked(nn, nsw, sys_status, status); |
| |
| out: |
| spin_unlock(&nn->nn_lock); |
| return; |
| } |
| |
| static void o2net_complete_nodes_nsw(struct o2net_node *nn) |
| { |
| struct o2net_status_wait *nsw, *tmp; |
| unsigned int num_kills = 0; |
| |
| assert_spin_locked(&nn->nn_lock); |
| |
| list_for_each_entry_safe(nsw, tmp, &nn->nn_status_list, ns_node_item) { |
| o2net_complete_nsw_locked(nn, nsw, O2NET_ERR_DIED, 0); |
| num_kills++; |
| } |
| |
| mlog(0, "completed %d messages for node %u\n", num_kills, |
| o2net_num_from_nn(nn)); |
| } |
| |
| static int o2net_nsw_completed(struct o2net_node *nn, |
| struct o2net_status_wait *nsw) |
| { |
| int completed; |
| spin_lock(&nn->nn_lock); |
| completed = list_empty(&nsw->ns_node_item); |
| spin_unlock(&nn->nn_lock); |
| return completed; |
| } |
| |
| /* ------------------------------------------------------------ */ |
| |
| static void sc_kref_release(struct kref *kref) |
| { |
| struct o2net_sock_container *sc = container_of(kref, |
| struct o2net_sock_container, sc_kref); |
| BUG_ON(timer_pending(&sc->sc_idle_timeout)); |
| |
| sclog(sc, "releasing\n"); |
| |
| if (sc->sc_sock) { |
| sock_release(sc->sc_sock); |
| sc->sc_sock = NULL; |
| } |
| |
| o2nm_undepend_item(&sc->sc_node->nd_item); |
| o2nm_node_put(sc->sc_node); |
| sc->sc_node = NULL; |
| |
| o2net_debug_del_sc(sc); |
| |
| if (sc->sc_page) |
| __free_page(sc->sc_page); |
| kfree(sc); |
| } |
| |
| static void sc_put(struct o2net_sock_container *sc) |
| { |
| sclog(sc, "put\n"); |
| kref_put(&sc->sc_kref, sc_kref_release); |
| } |
| static void sc_get(struct o2net_sock_container *sc) |
| { |
| sclog(sc, "get\n"); |
| kref_get(&sc->sc_kref); |
| } |
| static struct o2net_sock_container *sc_alloc(struct o2nm_node *node) |
| { |
| struct o2net_sock_container *sc, *ret = NULL; |
| struct page *page = NULL; |
| int status = 0; |
| |
| page = alloc_page(GFP_NOFS); |
| sc = kzalloc(sizeof(*sc), GFP_NOFS); |
| if (sc == NULL || page == NULL) |
| goto out; |
| |
| kref_init(&sc->sc_kref); |
| o2nm_node_get(node); |
| sc->sc_node = node; |
| |
| /* pin the node item of the remote node */ |
| status = o2nm_depend_item(&node->nd_item); |
| if (status) { |
| mlog_errno(status); |
| o2nm_node_put(node); |
| goto out; |
| } |
| INIT_WORK(&sc->sc_connect_work, o2net_sc_connect_completed); |
| INIT_WORK(&sc->sc_rx_work, o2net_rx_until_empty); |
| INIT_WORK(&sc->sc_shutdown_work, o2net_shutdown_sc); |
| INIT_DELAYED_WORK(&sc->sc_keepalive_work, o2net_sc_send_keep_req); |
| |
| init_timer(&sc->sc_idle_timeout); |
| sc->sc_idle_timeout.function = o2net_idle_timer; |
| sc->sc_idle_timeout.data = (unsigned long)sc; |
| |
| sclog(sc, "alloced\n"); |
| |
| ret = sc; |
| sc->sc_page = page; |
| o2net_debug_add_sc(sc); |
| sc = NULL; |
| page = NULL; |
| |
| out: |
| if (page) |
| __free_page(page); |
| kfree(sc); |
| |
| return ret; |
| } |
| |
| /* ------------------------------------------------------------ */ |
| |
| static void o2net_sc_queue_work(struct o2net_sock_container *sc, |
| struct work_struct *work) |
| { |
| sc_get(sc); |
| if (!queue_work(o2net_wq, work)) |
| sc_put(sc); |
| } |
| static void o2net_sc_queue_delayed_work(struct o2net_sock_container *sc, |
| struct delayed_work *work, |
| int delay) |
| { |
| sc_get(sc); |
| if (!queue_delayed_work(o2net_wq, work, delay)) |
| sc_put(sc); |
| } |
| static void o2net_sc_cancel_delayed_work(struct o2net_sock_container *sc, |
| struct delayed_work *work) |
| { |
| if (cancel_delayed_work(work)) |
| sc_put(sc); |
| } |
| |
| static atomic_t o2net_connected_peers = ATOMIC_INIT(0); |
| |
| int o2net_num_connected_peers(void) |
| { |
| return atomic_read(&o2net_connected_peers); |
| } |
| |
| static void o2net_set_nn_state(struct o2net_node *nn, |
| struct o2net_sock_container *sc, |
| unsigned valid, int err) |
| { |
| int was_valid = nn->nn_sc_valid; |
| int was_err = nn->nn_persistent_error; |
| struct o2net_sock_container *old_sc = nn->nn_sc; |
| |
| assert_spin_locked(&nn->nn_lock); |
| |
| if (old_sc && !sc) |
| atomic_dec(&o2net_connected_peers); |
| else if (!old_sc && sc) |
| atomic_inc(&o2net_connected_peers); |
| |
| /* the node num comparison and single connect/accept path should stop |
| * an non-null sc from being overwritten with another */ |
| BUG_ON(sc && nn->nn_sc && nn->nn_sc != sc); |
| mlog_bug_on_msg(err && valid, "err %d valid %u\n", err, valid); |
| mlog_bug_on_msg(valid && !sc, "valid %u sc %p\n", valid, sc); |
| |
| if (was_valid && !valid && err == 0) |
| err = -ENOTCONN; |
| |
| mlog(ML_CONN, "node %u sc: %p -> %p, valid %u -> %u, err %d -> %d\n", |
| o2net_num_from_nn(nn), nn->nn_sc, sc, nn->nn_sc_valid, valid, |
| nn->nn_persistent_error, err); |
| |
| nn->nn_sc = sc; |
| nn->nn_sc_valid = valid ? 1 : 0; |
| nn->nn_persistent_error = err; |
| |
| /* mirrors o2net_tx_can_proceed() */ |
| if (nn->nn_persistent_error || nn->nn_sc_valid) |
| wake_up(&nn->nn_sc_wq); |
| |
| if (was_valid && !was_err && nn->nn_persistent_error) { |
| o2quo_conn_err(o2net_num_from_nn(nn)); |
| queue_delayed_work(o2net_wq, &nn->nn_still_up, |
| msecs_to_jiffies(O2NET_QUORUM_DELAY_MS)); |
| } |
| |
| if (was_valid && !valid) { |
| if (old_sc) |
| printk(KERN_NOTICE "o2net: No longer connected to " |
| SC_NODEF_FMT "\n", SC_NODEF_ARGS(old_sc)); |
| o2net_complete_nodes_nsw(nn); |
| } |
| |
| if (!was_valid && valid) { |
| o2quo_conn_up(o2net_num_from_nn(nn)); |
| cancel_delayed_work(&nn->nn_connect_expired); |
| printk(KERN_NOTICE "o2net: %s " SC_NODEF_FMT "\n", |
| o2nm_this_node() > sc->sc_node->nd_num ? |
| "Connected to" : "Accepted connection from", |
| SC_NODEF_ARGS(sc)); |
| } |
| |
| /* trigger the connecting worker func as long as we're not valid, |
| * it will back off if it shouldn't connect. This can be called |
| * from node config teardown and so needs to be careful about |
| * the work queue actually being up. */ |
| if (!valid && o2net_wq) { |
| unsigned long delay; |
| /* delay if we're within a RECONNECT_DELAY of the |
| * last attempt */ |
| delay = (nn->nn_last_connect_attempt + |
| msecs_to_jiffies(o2net_reconnect_delay())) |
| - jiffies; |
| if (delay > msecs_to_jiffies(o2net_reconnect_delay())) |
| delay = 0; |
| mlog(ML_CONN, "queueing conn attempt in %lu jiffies\n", delay); |
| queue_delayed_work(o2net_wq, &nn->nn_connect_work, delay); |
| |
| /* |
| * Delay the expired work after idle timeout. |
| * |
| * We might have lots of failed connection attempts that run |
| * through here but we only cancel the connect_expired work when |
| * a connection attempt succeeds. So only the first enqueue of |
| * the connect_expired work will do anything. The rest will see |
| * that it's already queued and do nothing. |
| */ |
| delay += msecs_to_jiffies(o2net_idle_timeout()); |
| queue_delayed_work(o2net_wq, &nn->nn_connect_expired, delay); |
| } |
| |
| /* keep track of the nn's sc ref for the caller */ |
| if ((old_sc == NULL) && sc) |
| sc_get(sc); |
| if (old_sc && (old_sc != sc)) { |
| o2net_sc_queue_work(old_sc, &old_sc->sc_shutdown_work); |
| sc_put(old_sc); |
| } |
| } |
| |
| /* see o2net_register_callbacks() */ |
| static void o2net_data_ready(struct sock *sk) |
| { |
| void (*ready)(struct sock *sk); |
| |
| read_lock(&sk->sk_callback_lock); |
| if (sk->sk_user_data) { |
| struct o2net_sock_container *sc = sk->sk_user_data; |
| sclog(sc, "data_ready hit\n"); |
| o2net_set_data_ready_time(sc); |
| o2net_sc_queue_work(sc, &sc->sc_rx_work); |
| ready = sc->sc_data_ready; |
| } else { |
| ready = sk->sk_data_ready; |
| } |
| read_unlock(&sk->sk_callback_lock); |
| |
| ready(sk); |
| } |
| |
| /* see o2net_register_callbacks() */ |
| static void o2net_state_change(struct sock *sk) |
| { |
| void (*state_change)(struct sock *sk); |
| struct o2net_sock_container *sc; |
| |
| read_lock(&sk->sk_callback_lock); |
| sc = sk->sk_user_data; |
| if (sc == NULL) { |
| state_change = sk->sk_state_change; |
| goto out; |
| } |
| |
| sclog(sc, "state_change to %d\n", sk->sk_state); |
| |
| state_change = sc->sc_state_change; |
| |
| switch(sk->sk_state) { |
| /* ignore connecting sockets as they make progress */ |
| case TCP_SYN_SENT: |
| case TCP_SYN_RECV: |
| break; |
| case TCP_ESTABLISHED: |
| o2net_sc_queue_work(sc, &sc->sc_connect_work); |
| break; |
| default: |
| printk(KERN_INFO "o2net: Connection to " SC_NODEF_FMT |
| " shutdown, state %d\n", |
| SC_NODEF_ARGS(sc), sk->sk_state); |
| o2net_sc_queue_work(sc, &sc->sc_shutdown_work); |
| break; |
| } |
| out: |
| read_unlock(&sk->sk_callback_lock); |
| state_change(sk); |
| } |
| |
| /* |
| * we register callbacks so we can queue work on events before calling |
| * the original callbacks. our callbacks our careful to test user_data |
| * to discover when they've reaced with o2net_unregister_callbacks(). |
| */ |
| static void o2net_register_callbacks(struct sock *sk, |
| struct o2net_sock_container *sc) |
| { |
| write_lock_bh(&sk->sk_callback_lock); |
| |
| /* accepted sockets inherit the old listen socket data ready */ |
| if (sk->sk_data_ready == o2net_listen_data_ready) { |
| sk->sk_data_ready = sk->sk_user_data; |
| sk->sk_user_data = NULL; |
| } |
| |
| BUG_ON(sk->sk_user_data != NULL); |
| sk->sk_user_data = sc; |
| sc_get(sc); |
| |
| sc->sc_data_ready = sk->sk_data_ready; |
| sc->sc_state_change = sk->sk_state_change; |
| sk->sk_data_ready = o2net_data_ready; |
| sk->sk_state_change = o2net_state_change; |
| |
| mutex_init(&sc->sc_send_lock); |
| |
| write_unlock_bh(&sk->sk_callback_lock); |
| } |
| |
| static int o2net_unregister_callbacks(struct sock *sk, |
| struct o2net_sock_container *sc) |
| { |
| int ret = 0; |
| |
| write_lock_bh(&sk->sk_callback_lock); |
| if (sk->sk_user_data == sc) { |
| ret = 1; |
| sk->sk_user_data = NULL; |
| sk->sk_data_ready = sc->sc_data_ready; |
| sk->sk_state_change = sc->sc_state_change; |
| } |
| write_unlock_bh(&sk->sk_callback_lock); |
| |
| return ret; |
| } |
| |
| /* |
| * this is a little helper that is called by callers who have seen a problem |
| * with an sc and want to detach it from the nn if someone already hasn't beat |
| * them to it. if an error is given then the shutdown will be persistent |
| * and pending transmits will be canceled. |
| */ |
| static void o2net_ensure_shutdown(struct o2net_node *nn, |
| struct o2net_sock_container *sc, |
| int err) |
| { |
| spin_lock(&nn->nn_lock); |
| if (nn->nn_sc == sc) |
| o2net_set_nn_state(nn, NULL, 0, err); |
| spin_unlock(&nn->nn_lock); |
| } |
| |
| /* |
| * This work queue function performs the blocking parts of socket shutdown. A |
| * few paths lead here. set_nn_state will trigger this callback if it sees an |
| * sc detached from the nn. state_change will also trigger this callback |
| * directly when it sees errors. In that case we need to call set_nn_state |
| * ourselves as state_change couldn't get the nn_lock and call set_nn_state |
| * itself. |
| */ |
| static void o2net_shutdown_sc(struct work_struct *work) |
| { |
| struct o2net_sock_container *sc = |
| container_of(work, struct o2net_sock_container, |
| sc_shutdown_work); |
| struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num); |
| |
| sclog(sc, "shutting down\n"); |
| |
| /* drop the callbacks ref and call shutdown only once */ |
| if (o2net_unregister_callbacks(sc->sc_sock->sk, sc)) { |
| /* we shouldn't flush as we're in the thread, the |
| * races with pending sc work structs are harmless */ |
| del_timer_sync(&sc->sc_idle_timeout); |
| o2net_sc_cancel_delayed_work(sc, &sc->sc_keepalive_work); |
| sc_put(sc); |
| kernel_sock_shutdown(sc->sc_sock, SHUT_RDWR); |
| } |
| |
| /* not fatal so failed connects before the other guy has our |
| * heartbeat can be retried */ |
| o2net_ensure_shutdown(nn, sc, 0); |
| sc_put(sc); |
| } |
| |
| /* ------------------------------------------------------------ */ |
| |
| static int o2net_handler_cmp(struct o2net_msg_handler *nmh, u32 msg_type, |
| u32 key) |
| { |
| int ret = memcmp(&nmh->nh_key, &key, sizeof(key)); |
| |
| if (ret == 0) |
| ret = memcmp(&nmh->nh_msg_type, &msg_type, sizeof(msg_type)); |
| |
| return ret; |
| } |
| |
| static struct o2net_msg_handler * |
| o2net_handler_tree_lookup(u32 msg_type, u32 key, struct rb_node ***ret_p, |
| struct rb_node **ret_parent) |
| { |
| struct rb_node **p = &o2net_handler_tree.rb_node; |
| struct rb_node *parent = NULL; |
| struct o2net_msg_handler *nmh, *ret = NULL; |
| int cmp; |
| |
| while (*p) { |
| parent = *p; |
| nmh = rb_entry(parent, struct o2net_msg_handler, nh_node); |
| cmp = o2net_handler_cmp(nmh, msg_type, key); |
| |
| if (cmp < 0) |
| p = &(*p)->rb_left; |
| else if (cmp > 0) |
| p = &(*p)->rb_right; |
| else { |
| ret = nmh; |
| break; |
| } |
| } |
| |
| if (ret_p != NULL) |
| *ret_p = p; |
| if (ret_parent != NULL) |
| *ret_parent = parent; |
| |
| return ret; |
| } |
| |
| static void o2net_handler_kref_release(struct kref *kref) |
| { |
| struct o2net_msg_handler *nmh; |
| nmh = container_of(kref, struct o2net_msg_handler, nh_kref); |
| |
| kfree(nmh); |
| } |
| |
| static void o2net_handler_put(struct o2net_msg_handler *nmh) |
| { |
| kref_put(&nmh->nh_kref, o2net_handler_kref_release); |
| } |
| |
| /* max_len is protection for the handler func. incoming messages won't |
| * be given to the handler if their payload is longer than the max. */ |
| int o2net_register_handler(u32 msg_type, u32 key, u32 max_len, |
| o2net_msg_handler_func *func, void *data, |
| o2net_post_msg_handler_func *post_func, |
| struct list_head *unreg_list) |
| { |
| struct o2net_msg_handler *nmh = NULL; |
| struct rb_node **p, *parent; |
| int ret = 0; |
| |
| if (max_len > O2NET_MAX_PAYLOAD_BYTES) { |
| mlog(0, "max_len for message handler out of range: %u\n", |
| max_len); |
| ret = -EINVAL; |
| goto out; |
| } |
| |
| if (!msg_type) { |
| mlog(0, "no message type provided: %u, %p\n", msg_type, func); |
| ret = -EINVAL; |
| goto out; |
| |
| } |
| if (!func) { |
| mlog(0, "no message handler provided: %u, %p\n", |
| msg_type, func); |
| ret = -EINVAL; |
| goto out; |
| } |
| |
| nmh = kzalloc(sizeof(struct o2net_msg_handler), GFP_NOFS); |
| if (nmh == NULL) { |
| ret = -ENOMEM; |
| goto out; |
| } |
| |
| nmh->nh_func = func; |
| nmh->nh_func_data = data; |
| nmh->nh_post_func = post_func; |
| nmh->nh_msg_type = msg_type; |
| nmh->nh_max_len = max_len; |
| nmh->nh_key = key; |
| /* the tree and list get this ref.. they're both removed in |
| * unregister when this ref is dropped */ |
| kref_init(&nmh->nh_kref); |
| INIT_LIST_HEAD(&nmh->nh_unregister_item); |
| |
| write_lock(&o2net_handler_lock); |
| if (o2net_handler_tree_lookup(msg_type, key, &p, &parent)) |
| ret = -EEXIST; |
| else { |
| rb_link_node(&nmh->nh_node, parent, p); |
| rb_insert_color(&nmh->nh_node, &o2net_handler_tree); |
| list_add_tail(&nmh->nh_unregister_item, unreg_list); |
| |
| mlog(ML_TCP, "registered handler func %p type %u key %08x\n", |
| func, msg_type, key); |
| /* we've had some trouble with handlers seemingly vanishing. */ |
| mlog_bug_on_msg(o2net_handler_tree_lookup(msg_type, key, &p, |
| &parent) == NULL, |
| "couldn't find handler we *just* registered " |
| "for type %u key %08x\n", msg_type, key); |
| } |
| write_unlock(&o2net_handler_lock); |
| if (ret) |
| goto out; |
| |
| out: |
| if (ret) |
| kfree(nmh); |
| |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(o2net_register_handler); |
| |
| void o2net_unregister_handler_list(struct list_head *list) |
| { |
| struct o2net_msg_handler *nmh, *n; |
| |
| write_lock(&o2net_handler_lock); |
| list_for_each_entry_safe(nmh, n, list, nh_unregister_item) { |
| mlog(ML_TCP, "unregistering handler func %p type %u key %08x\n", |
| nmh->nh_func, nmh->nh_msg_type, nmh->nh_key); |
| rb_erase(&nmh->nh_node, &o2net_handler_tree); |
| list_del_init(&nmh->nh_unregister_item); |
| kref_put(&nmh->nh_kref, o2net_handler_kref_release); |
| } |
| write_unlock(&o2net_handler_lock); |
| } |
| EXPORT_SYMBOL_GPL(o2net_unregister_handler_list); |
| |
| static struct o2net_msg_handler *o2net_handler_get(u32 msg_type, u32 key) |
| { |
| struct o2net_msg_handler *nmh; |
| |
| read_lock(&o2net_handler_lock); |
| nmh = o2net_handler_tree_lookup(msg_type, key, NULL, NULL); |
| if (nmh) |
| kref_get(&nmh->nh_kref); |
| read_unlock(&o2net_handler_lock); |
| |
| return nmh; |
| } |
| |
| /* ------------------------------------------------------------ */ |
| |
| static int o2net_recv_tcp_msg(struct socket *sock, void *data, size_t len) |
| { |
| struct kvec vec = { .iov_len = len, .iov_base = data, }; |
| struct msghdr msg = { .msg_flags = MSG_DONTWAIT, }; |
| return kernel_recvmsg(sock, &msg, &vec, 1, len, msg.msg_flags); |
| } |
| |
| static int o2net_send_tcp_msg(struct socket *sock, struct kvec *vec, |
| size_t veclen, size_t total) |
| { |
| int ret; |
| struct msghdr msg; |
| |
| if (sock == NULL) { |
| ret = -EINVAL; |
| goto out; |
| } |
| |
| ret = kernel_sendmsg(sock, &msg, vec, veclen, total); |
| if (likely(ret == total)) |
| return 0; |
| mlog(ML_ERROR, "sendmsg returned %d instead of %zu\n", ret, total); |
| if (ret >= 0) |
| ret = -EPIPE; /* should be smarter, I bet */ |
| out: |
| mlog(0, "returning error: %d\n", ret); |
| return ret; |
| } |
| |
| static void o2net_sendpage(struct o2net_sock_container *sc, |
| void *kmalloced_virt, |
| size_t size) |
| { |
| struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num); |
| ssize_t ret; |
| |
| while (1) { |
| mutex_lock(&sc->sc_send_lock); |
| ret = sc->sc_sock->ops->sendpage(sc->sc_sock, |
| virt_to_page(kmalloced_virt), |
| (long)kmalloced_virt & ~PAGE_MASK, |
| size, MSG_DONTWAIT); |
| mutex_unlock(&sc->sc_send_lock); |
| if (ret == size) |
| break; |
| if (ret == (ssize_t)-EAGAIN) { |
| mlog(0, "sendpage of size %zu to " SC_NODEF_FMT |
| " returned EAGAIN\n", size, SC_NODEF_ARGS(sc)); |
| cond_resched(); |
| continue; |
| } |
| mlog(ML_ERROR, "sendpage of size %zu to " SC_NODEF_FMT |
| " failed with %zd\n", size, SC_NODEF_ARGS(sc), ret); |
| o2net_ensure_shutdown(nn, sc, 0); |
| break; |
| } |
| } |
| |
| static void o2net_init_msg(struct o2net_msg *msg, u16 data_len, u16 msg_type, u32 key) |
| { |
| memset(msg, 0, sizeof(struct o2net_msg)); |
| msg->magic = cpu_to_be16(O2NET_MSG_MAGIC); |
| msg->data_len = cpu_to_be16(data_len); |
| msg->msg_type = cpu_to_be16(msg_type); |
| msg->sys_status = cpu_to_be32(O2NET_ERR_NONE); |
| msg->status = 0; |
| msg->key = cpu_to_be32(key); |
| } |
| |
| static int o2net_tx_can_proceed(struct o2net_node *nn, |
| struct o2net_sock_container **sc_ret, |
| int *error) |
| { |
| int ret = 0; |
| |
| spin_lock(&nn->nn_lock); |
| if (nn->nn_persistent_error) { |
| ret = 1; |
| *sc_ret = NULL; |
| *error = nn->nn_persistent_error; |
| } else if (nn->nn_sc_valid) { |
| kref_get(&nn->nn_sc->sc_kref); |
| |
| ret = 1; |
| *sc_ret = nn->nn_sc; |
| *error = 0; |
| } |
| spin_unlock(&nn->nn_lock); |
| |
| return ret; |
| } |
| |
| /* Get a map of all nodes to which this node is currently connected to */ |
| void o2net_fill_node_map(unsigned long *map, unsigned bytes) |
| { |
| struct o2net_sock_container *sc; |
| int node, ret; |
| |
| BUG_ON(bytes < (BITS_TO_LONGS(O2NM_MAX_NODES) * sizeof(unsigned long))); |
| |
| memset(map, 0, bytes); |
| for (node = 0; node < O2NM_MAX_NODES; ++node) { |
| o2net_tx_can_proceed(o2net_nn_from_num(node), &sc, &ret); |
| if (!ret) { |
| set_bit(node, map); |
| sc_put(sc); |
| } |
| } |
| } |
| EXPORT_SYMBOL_GPL(o2net_fill_node_map); |
| |
| int o2net_send_message_vec(u32 msg_type, u32 key, struct kvec *caller_vec, |
| size_t caller_veclen, u8 target_node, int *status) |
| { |
| int ret = 0; |
| struct o2net_msg *msg = NULL; |
| size_t veclen, caller_bytes = 0; |
| struct kvec *vec = NULL; |
| struct o2net_sock_container *sc = NULL; |
| struct o2net_node *nn = o2net_nn_from_num(target_node); |
| struct o2net_status_wait nsw = { |
| .ns_node_item = LIST_HEAD_INIT(nsw.ns_node_item), |
| }; |
| struct o2net_send_tracking nst; |
| |
| o2net_init_nst(&nst, msg_type, key, current, target_node); |
| |
| if (o2net_wq == NULL) { |
| mlog(0, "attempt to tx without o2netd running\n"); |
| ret = -ESRCH; |
| goto out; |
| } |
| |
| if (caller_veclen == 0) { |
| mlog(0, "bad kvec array length\n"); |
| ret = -EINVAL; |
| goto out; |
| } |
| |
| caller_bytes = iov_length((struct iovec *)caller_vec, caller_veclen); |
| if (caller_bytes > O2NET_MAX_PAYLOAD_BYTES) { |
| mlog(0, "total payload len %zu too large\n", caller_bytes); |
| ret = -EINVAL; |
| goto out; |
| } |
| |
| if (target_node == o2nm_this_node()) { |
| ret = -ELOOP; |
| goto out; |
| } |
| |
| o2net_debug_add_nst(&nst); |
| |
| o2net_set_nst_sock_time(&nst); |
| |
| wait_event(nn->nn_sc_wq, o2net_tx_can_proceed(nn, &sc, &ret)); |
| if (ret) |
| goto out; |
| |
| o2net_set_nst_sock_container(&nst, sc); |
| |
| veclen = caller_veclen + 1; |
| vec = kmalloc(sizeof(struct kvec) * veclen, GFP_ATOMIC); |
| if (vec == NULL) { |
| mlog(0, "failed to %zu element kvec!\n", veclen); |
| ret = -ENOMEM; |
| goto out; |
| } |
| |
| msg = kmalloc(sizeof(struct o2net_msg), GFP_ATOMIC); |
| if (!msg) { |
| mlog(0, "failed to allocate a o2net_msg!\n"); |
| ret = -ENOMEM; |
| goto out; |
| } |
| |
| o2net_init_msg(msg, caller_bytes, msg_type, key); |
| |
| vec[0].iov_len = sizeof(struct o2net_msg); |
| vec[0].iov_base = msg; |
| memcpy(&vec[1], caller_vec, caller_veclen * sizeof(struct kvec)); |
| |
| ret = o2net_prep_nsw(nn, &nsw); |
| if (ret) |
| goto out; |
| |
| msg->msg_num = cpu_to_be32(nsw.ns_id); |
| o2net_set_nst_msg_id(&nst, nsw.ns_id); |
| |
| o2net_set_nst_send_time(&nst); |
| |
| /* finally, convert the message header to network byte-order |
| * and send */ |
| mutex_lock(&sc->sc_send_lock); |
| ret = o2net_send_tcp_msg(sc->sc_sock, vec, veclen, |
| sizeof(struct o2net_msg) + caller_bytes); |
| mutex_unlock(&sc->sc_send_lock); |
| msglog(msg, "sending returned %d\n", ret); |
| if (ret < 0) { |
| mlog(0, "error returned from o2net_send_tcp_msg=%d\n", ret); |
| goto out; |
| } |
| |
| /* wait on other node's handler */ |
| o2net_set_nst_status_time(&nst); |
| wait_event(nsw.ns_wq, o2net_nsw_completed(nn, &nsw)); |
| |
| o2net_update_send_stats(&nst, sc); |
| |
| /* Note that we avoid overwriting the callers status return |
| * variable if a system error was reported on the other |
| * side. Callers beware. */ |
| ret = o2net_sys_err_to_errno(nsw.ns_sys_status); |
| if (status && !ret) |
| *status = nsw.ns_status; |
| |
| mlog(0, "woken, returning system status %d, user status %d\n", |
| ret, nsw.ns_status); |
| out: |
| o2net_debug_del_nst(&nst); /* must be before dropping sc and node */ |
| if (sc) |
| sc_put(sc); |
| kfree(vec); |
| kfree(msg); |
| o2net_complete_nsw(nn, &nsw, 0, 0, 0); |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(o2net_send_message_vec); |
| |
| int o2net_send_message(u32 msg_type, u32 key, void *data, u32 len, |
| u8 target_node, int *status) |
| { |
| struct kvec vec = { |
| .iov_base = data, |
| .iov_len = len, |
| }; |
| return o2net_send_message_vec(msg_type, key, &vec, 1, |
| target_node, status); |
| } |
| EXPORT_SYMBOL_GPL(o2net_send_message); |
| |
| static int o2net_send_status_magic(struct socket *sock, struct o2net_msg *hdr, |
| enum o2net_system_error syserr, int err) |
| { |
| struct kvec vec = { |
| .iov_base = hdr, |
| .iov_len = sizeof(struct o2net_msg), |
| }; |
| |
| BUG_ON(syserr >= O2NET_ERR_MAX); |
| |
| /* leave other fields intact from the incoming message, msg_num |
| * in particular */ |
| hdr->sys_status = cpu_to_be32(syserr); |
| hdr->status = cpu_to_be32(err); |
| hdr->magic = cpu_to_be16(O2NET_MSG_STATUS_MAGIC); // twiddle the magic |
| hdr->data_len = 0; |
| |
| msglog(hdr, "about to send status magic %d\n", err); |
| /* hdr has been in host byteorder this whole time */ |
| return o2net_send_tcp_msg(sock, &vec, 1, sizeof(struct o2net_msg)); |
| } |
| |
| /* this returns -errno if the header was unknown or too large, etc. |
| * after this is called the buffer us reused for the next message */ |
| static int o2net_process_message(struct o2net_sock_container *sc, |
| struct o2net_msg *hdr) |
| { |
| struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num); |
| int ret = 0, handler_status; |
| enum o2net_system_error syserr; |
| struct o2net_msg_handler *nmh = NULL; |
| void *ret_data = NULL; |
| |
| msglog(hdr, "processing message\n"); |
| |
| o2net_sc_postpone_idle(sc); |
| |
| switch(be16_to_cpu(hdr->magic)) { |
| case O2NET_MSG_STATUS_MAGIC: |
| /* special type for returning message status */ |
| o2net_complete_nsw(nn, NULL, |
| be32_to_cpu(hdr->msg_num), |
| be32_to_cpu(hdr->sys_status), |
| be32_to_cpu(hdr->status)); |
| goto out; |
| case O2NET_MSG_KEEP_REQ_MAGIC: |
| o2net_sendpage(sc, o2net_keep_resp, |
| sizeof(*o2net_keep_resp)); |
| goto out; |
| case O2NET_MSG_KEEP_RESP_MAGIC: |
| goto out; |
| case O2NET_MSG_MAGIC: |
| break; |
| default: |
| msglog(hdr, "bad magic\n"); |
| ret = -EINVAL; |
| goto out; |
| break; |
| } |
| |
| /* find a handler for it */ |
| handler_status = 0; |
| nmh = o2net_handler_get(be16_to_cpu(hdr->msg_type), |
| be32_to_cpu(hdr->key)); |
| if (!nmh) { |
| mlog(ML_TCP, "couldn't find handler for type %u key %08x\n", |
| be16_to_cpu(hdr->msg_type), be32_to_cpu(hdr->key)); |
| syserr = O2NET_ERR_NO_HNDLR; |
| goto out_respond; |
| } |
| |
| syserr = O2NET_ERR_NONE; |
| |
| if (be16_to_cpu(hdr->data_len) > nmh->nh_max_len) |
| syserr = O2NET_ERR_OVERFLOW; |
| |
| if (syserr != O2NET_ERR_NONE) |
| goto out_respond; |
| |
| o2net_set_func_start_time(sc); |
| sc->sc_msg_key = be32_to_cpu(hdr->key); |
| sc->sc_msg_type = be16_to_cpu(hdr->msg_type); |
| handler_status = (nmh->nh_func)(hdr, sizeof(struct o2net_msg) + |
| be16_to_cpu(hdr->data_len), |
| nmh->nh_func_data, &ret_data); |
| o2net_set_func_stop_time(sc); |
| |
| o2net_update_recv_stats(sc); |
| |
| out_respond: |
| /* this destroys the hdr, so don't use it after this */ |
| mutex_lock(&sc->sc_send_lock); |
| ret = o2net_send_status_magic(sc->sc_sock, hdr, syserr, |
| handler_status); |
| mutex_unlock(&sc->sc_send_lock); |
| hdr = NULL; |
| mlog(0, "sending handler status %d, syserr %d returned %d\n", |
| handler_status, syserr, ret); |
| |
| if (nmh) { |
| BUG_ON(ret_data != NULL && nmh->nh_post_func == NULL); |
| if (nmh->nh_post_func) |
| (nmh->nh_post_func)(handler_status, nmh->nh_func_data, |
| ret_data); |
| } |
| |
| out: |
| if (nmh) |
| o2net_handler_put(nmh); |
| return ret; |
| } |
| |
| static int o2net_check_handshake(struct o2net_sock_container *sc) |
| { |
| struct o2net_handshake *hand = page_address(sc->sc_page); |
| struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num); |
| |
| if (hand->protocol_version != cpu_to_be64(O2NET_PROTOCOL_VERSION)) { |
| printk(KERN_NOTICE "o2net: " SC_NODEF_FMT " Advertised net " |
| "protocol version %llu but %llu is required. " |
| "Disconnecting.\n", SC_NODEF_ARGS(sc), |
| (unsigned long long)be64_to_cpu(hand->protocol_version), |
| O2NET_PROTOCOL_VERSION); |
| |
| /* don't bother reconnecting if its the wrong version. */ |
| o2net_ensure_shutdown(nn, sc, -ENOTCONN); |
| return -1; |
| } |
| |
| /* |
| * Ensure timeouts are consistent with other nodes, otherwise |
| * we can end up with one node thinking that the other must be down, |
| * but isn't. This can ultimately cause corruption. |
| */ |
| if (be32_to_cpu(hand->o2net_idle_timeout_ms) != |
| o2net_idle_timeout()) { |
| printk(KERN_NOTICE "o2net: " SC_NODEF_FMT " uses a network " |
| "idle timeout of %u ms, but we use %u ms locally. " |
| "Disconnecting.\n", SC_NODEF_ARGS(sc), |
| be32_to_cpu(hand->o2net_idle_timeout_ms), |
| o2net_idle_timeout()); |
| o2net_ensure_shutdown(nn, sc, -ENOTCONN); |
| return -1; |
| } |
| |
| if (be32_to_cpu(hand->o2net_keepalive_delay_ms) != |
| o2net_keepalive_delay()) { |
| printk(KERN_NOTICE "o2net: " SC_NODEF_FMT " uses a keepalive " |
| "delay of %u ms, but we use %u ms locally. " |
| "Disconnecting.\n", SC_NODEF_ARGS(sc), |
| be32_to_cpu(hand->o2net_keepalive_delay_ms), |
| o2net_keepalive_delay()); |
| o2net_ensure_shutdown(nn, sc, -ENOTCONN); |
| return -1; |
| } |
| |
| if (be32_to_cpu(hand->o2hb_heartbeat_timeout_ms) != |
| O2HB_MAX_WRITE_TIMEOUT_MS) { |
| printk(KERN_NOTICE "o2net: " SC_NODEF_FMT " uses a heartbeat " |
| "timeout of %u ms, but we use %u ms locally. " |
| "Disconnecting.\n", SC_NODEF_ARGS(sc), |
| be32_to_cpu(hand->o2hb_heartbeat_timeout_ms), |
| O2HB_MAX_WRITE_TIMEOUT_MS); |
| o2net_ensure_shutdown(nn, sc, -ENOTCONN); |
| return -1; |
| } |
| |
| sc->sc_handshake_ok = 1; |
| |
| spin_lock(&nn->nn_lock); |
| /* set valid and queue the idle timers only if it hasn't been |
| * shut down already */ |
| if (nn->nn_sc == sc) { |
| o2net_sc_reset_idle_timer(sc); |
| atomic_set(&nn->nn_timeout, 0); |
| o2net_set_nn_state(nn, sc, 1, 0); |
| } |
| spin_unlock(&nn->nn_lock); |
| |
| /* shift everything up as though it wasn't there */ |
| sc->sc_page_off -= sizeof(struct o2net_handshake); |
| if (sc->sc_page_off) |
| memmove(hand, hand + 1, sc->sc_page_off); |
| |
| return 0; |
| } |
| |
| /* this demuxes the queued rx bytes into header or payload bits and calls |
| * handlers as each full message is read off the socket. it returns -error, |
| * == 0 eof, or > 0 for progress made.*/ |
| static int o2net_advance_rx(struct o2net_sock_container *sc) |
| { |
| struct o2net_msg *hdr; |
| int ret = 0; |
| void *data; |
| size_t datalen; |
| |
| sclog(sc, "receiving\n"); |
| o2net_set_advance_start_time(sc); |
| |
| if (unlikely(sc->sc_handshake_ok == 0)) { |
| if(sc->sc_page_off < sizeof(struct o2net_handshake)) { |
| data = page_address(sc->sc_page) + sc->sc_page_off; |
| datalen = sizeof(struct o2net_handshake) - sc->sc_page_off; |
| ret = o2net_recv_tcp_msg(sc->sc_sock, data, datalen); |
| if (ret > 0) |
| sc->sc_page_off += ret; |
| } |
| |
| if (sc->sc_page_off == sizeof(struct o2net_handshake)) { |
| o2net_check_handshake(sc); |
| if (unlikely(sc->sc_handshake_ok == 0)) |
| ret = -EPROTO; |
| } |
| goto out; |
| } |
| |
| /* do we need more header? */ |
| if (sc->sc_page_off < sizeof(struct o2net_msg)) { |
| data = page_address(sc->sc_page) + sc->sc_page_off; |
| datalen = sizeof(struct o2net_msg) - sc->sc_page_off; |
| ret = o2net_recv_tcp_msg(sc->sc_sock, data, datalen); |
| if (ret > 0) { |
| sc->sc_page_off += ret; |
| /* only swab incoming here.. we can |
| * only get here once as we cross from |
| * being under to over */ |
| if (sc->sc_page_off == sizeof(struct o2net_msg)) { |
| hdr = page_address(sc->sc_page); |
| if (be16_to_cpu(hdr->data_len) > |
| O2NET_MAX_PAYLOAD_BYTES) |
| ret = -EOVERFLOW; |
| } |
| } |
| if (ret <= 0) |
| goto out; |
| } |
| |
| if (sc->sc_page_off < sizeof(struct o2net_msg)) { |
| /* oof, still don't have a header */ |
| goto out; |
| } |
| |
| /* this was swabbed above when we first read it */ |
| hdr = page_address(sc->sc_page); |
| |
| msglog(hdr, "at page_off %zu\n", sc->sc_page_off); |
| |
| /* do we need more payload? */ |
| if (sc->sc_page_off - sizeof(struct o2net_msg) < be16_to_cpu(hdr->data_len)) { |
| /* need more payload */ |
| data = page_address(sc->sc_page) + sc->sc_page_off; |
| datalen = (sizeof(struct o2net_msg) + be16_to_cpu(hdr->data_len)) - |
| sc->sc_page_off; |
| ret = o2net_recv_tcp_msg(sc->sc_sock, data, datalen); |
| if (ret > 0) |
| sc->sc_page_off += ret; |
| if (ret <= 0) |
| goto out; |
| } |
| |
| if (sc->sc_page_off - sizeof(struct o2net_msg) == be16_to_cpu(hdr->data_len)) { |
| /* we can only get here once, the first time we read |
| * the payload.. so set ret to progress if the handler |
| * works out. after calling this the message is toast */ |
| ret = o2net_process_message(sc, hdr); |
| if (ret == 0) |
| ret = 1; |
| sc->sc_page_off = 0; |
| } |
| |
| out: |
| sclog(sc, "ret = %d\n", ret); |
| o2net_set_advance_stop_time(sc); |
| return ret; |
| } |
| |
| /* this work func is triggerd by data ready. it reads until it can read no |
| * more. it interprets 0, eof, as fatal. if data_ready hits while we're doing |
| * our work the work struct will be marked and we'll be called again. */ |
| static void o2net_rx_until_empty(struct work_struct *work) |
| { |
| struct o2net_sock_container *sc = |
| container_of(work, struct o2net_sock_container, sc_rx_work); |
| int ret; |
| |
| do { |
| ret = o2net_advance_rx(sc); |
| } while (ret > 0); |
| |
| if (ret <= 0 && ret != -EAGAIN) { |
| struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num); |
| sclog(sc, "saw error %d, closing\n", ret); |
| /* not permanent so read failed handshake can retry */ |
| o2net_ensure_shutdown(nn, sc, 0); |
| } |
| |
| sc_put(sc); |
| } |
| |
| static int o2net_set_nodelay(struct socket *sock) |
| { |
| int ret, val = 1; |
| mm_segment_t oldfs; |
| |
| oldfs = get_fs(); |
| set_fs(KERNEL_DS); |
| |
| /* |
| * Dear unsuspecting programmer, |
| * |
| * Don't use sock_setsockopt() for SOL_TCP. It doesn't check its level |
| * argument and assumes SOL_SOCKET so, say, your TCP_NODELAY will |
| * silently turn into SO_DEBUG. |
| * |
| * Yours, |
| * Keeper of hilariously fragile interfaces. |
| */ |
| ret = sock->ops->setsockopt(sock, SOL_TCP, TCP_NODELAY, |
| (char __user *)&val, sizeof(val)); |
| |
| set_fs(oldfs); |
| return ret; |
| } |
| |
| static int o2net_set_usertimeout(struct socket *sock) |
| { |
| int user_timeout = O2NET_TCP_USER_TIMEOUT; |
| |
| return kernel_setsockopt(sock, SOL_TCP, TCP_USER_TIMEOUT, |
| (char *)&user_timeout, sizeof(user_timeout)); |
| } |
| |
| static void o2net_initialize_handshake(void) |
| { |
| o2net_hand->o2hb_heartbeat_timeout_ms = cpu_to_be32( |
| O2HB_MAX_WRITE_TIMEOUT_MS); |
| o2net_hand->o2net_idle_timeout_ms = cpu_to_be32(o2net_idle_timeout()); |
| o2net_hand->o2net_keepalive_delay_ms = cpu_to_be32( |
| o2net_keepalive_delay()); |
| o2net_hand->o2net_reconnect_delay_ms = cpu_to_be32( |
| o2net_reconnect_delay()); |
| } |
| |
| /* ------------------------------------------------------------ */ |
| |
| /* called when a connect completes and after a sock is accepted. the |
| * rx path will see the response and mark the sc valid */ |
| static void o2net_sc_connect_completed(struct work_struct *work) |
| { |
| struct o2net_sock_container *sc = |
| container_of(work, struct o2net_sock_container, |
| sc_connect_work); |
| |
| mlog(ML_MSG, "sc sending handshake with ver %llu id %llx\n", |
| (unsigned long long)O2NET_PROTOCOL_VERSION, |
| (unsigned long long)be64_to_cpu(o2net_hand->connector_id)); |
| |
| o2net_initialize_handshake(); |
| o2net_sendpage(sc, o2net_hand, sizeof(*o2net_hand)); |
| sc_put(sc); |
| } |
| |
| /* this is called as a work_struct func. */ |
| static void o2net_sc_send_keep_req(struct work_struct *work) |
| { |
| struct o2net_sock_container *sc = |
| container_of(work, struct o2net_sock_container, |
| sc_keepalive_work.work); |
| |
| o2net_sendpage(sc, o2net_keep_req, sizeof(*o2net_keep_req)); |
| sc_put(sc); |
| } |
| |
| /* socket shutdown does a del_timer_sync against this as it tears down. |
| * we can't start this timer until we've got to the point in sc buildup |
| * where shutdown is going to be involved */ |
| static void o2net_idle_timer(unsigned long data) |
| { |
| struct o2net_sock_container *sc = (struct o2net_sock_container *)data; |
| struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num); |
| #ifdef CONFIG_DEBUG_FS |
| unsigned long msecs = ktime_to_ms(ktime_get()) - |
| ktime_to_ms(sc->sc_tv_timer); |
| #else |
| unsigned long msecs = o2net_idle_timeout(); |
| #endif |
| |
| printk(KERN_NOTICE "o2net: Connection to " SC_NODEF_FMT " has been " |
| "idle for %lu.%lu secs.\n", |
| SC_NODEF_ARGS(sc), msecs / 1000, msecs % 1000); |
| |
| /* idle timerout happen, don't shutdown the connection, but |
| * make fence decision. Maybe the connection can recover before |
| * the decision is made. |
| */ |
| atomic_set(&nn->nn_timeout, 1); |
| o2quo_conn_err(o2net_num_from_nn(nn)); |
| queue_delayed_work(o2net_wq, &nn->nn_still_up, |
| msecs_to_jiffies(O2NET_QUORUM_DELAY_MS)); |
| |
| o2net_sc_reset_idle_timer(sc); |
| |
| } |
| |
| static void o2net_sc_reset_idle_timer(struct o2net_sock_container *sc) |
| { |
| o2net_sc_cancel_delayed_work(sc, &sc->sc_keepalive_work); |
| o2net_sc_queue_delayed_work(sc, &sc->sc_keepalive_work, |
| msecs_to_jiffies(o2net_keepalive_delay())); |
| o2net_set_sock_timer(sc); |
| mod_timer(&sc->sc_idle_timeout, |
| jiffies + msecs_to_jiffies(o2net_idle_timeout())); |
| } |
| |
| static void o2net_sc_postpone_idle(struct o2net_sock_container *sc) |
| { |
| struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num); |
| |
| /* clear fence decision since the connection recover from timeout*/ |
| if (atomic_read(&nn->nn_timeout)) { |
| o2quo_conn_up(o2net_num_from_nn(nn)); |
| cancel_delayed_work(&nn->nn_still_up); |
| atomic_set(&nn->nn_timeout, 0); |
| } |
| |
| /* Only push out an existing timer */ |
| if (timer_pending(&sc->sc_idle_timeout)) |
| o2net_sc_reset_idle_timer(sc); |
| } |
| |
| /* this work func is kicked whenever a path sets the nn state which doesn't |
| * have valid set. This includes seeing hb come up, losing a connection, |
| * having a connect attempt fail, etc. This centralizes the logic which decides |
| * if a connect attempt should be made or if we should give up and all future |
| * transmit attempts should fail */ |
| static void o2net_start_connect(struct work_struct *work) |
| { |
| struct o2net_node *nn = |
| container_of(work, struct o2net_node, nn_connect_work.work); |
| struct o2net_sock_container *sc = NULL; |
| struct o2nm_node *node = NULL, *mynode = NULL; |
| struct socket *sock = NULL; |
| struct sockaddr_in myaddr = {0, }, remoteaddr = {0, }; |
| int ret = 0, stop; |
| unsigned int timeout; |
| |
| /* if we're greater we initiate tx, otherwise we accept */ |
| if (o2nm_this_node() <= o2net_num_from_nn(nn)) |
| goto out; |
| |
| /* watch for racing with tearing a node down */ |
| node = o2nm_get_node_by_num(o2net_num_from_nn(nn)); |
| if (node == NULL) { |
| ret = 0; |
| goto out; |
| } |
| |
| mynode = o2nm_get_node_by_num(o2nm_this_node()); |
| if (mynode == NULL) { |
| ret = 0; |
| goto out; |
| } |
| |
| spin_lock(&nn->nn_lock); |
| /* |
| * see if we already have one pending or have given up. |
| * For nn_timeout, it is set when we close the connection |
| * because of the idle time out. So it means that we have |
| * at least connected to that node successfully once, |
| * now try to connect to it again. |
| */ |
| timeout = atomic_read(&nn->nn_timeout); |
| stop = (nn->nn_sc || |
| (nn->nn_persistent_error && |
| (nn->nn_persistent_error != -ENOTCONN || timeout == 0))); |
| spin_unlock(&nn->nn_lock); |
| if (stop) |
| goto out; |
| |
| nn->nn_last_connect_attempt = jiffies; |
| |
| sc = sc_alloc(node); |
| if (sc == NULL) { |
| mlog(0, "couldn't allocate sc\n"); |
| ret = -ENOMEM; |
| goto out; |
| } |
| |
| ret = sock_create(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock); |
| if (ret < 0) { |
| mlog(0, "can't create socket: %d\n", ret); |
| goto out; |
| } |
| sc->sc_sock = sock; /* freed by sc_kref_release */ |
| |
| sock->sk->sk_allocation = GFP_ATOMIC; |
| |
| myaddr.sin_family = AF_INET; |
| myaddr.sin_addr.s_addr = mynode->nd_ipv4_address; |
| myaddr.sin_port = htons(0); /* any port */ |
| |
| ret = sock->ops->bind(sock, (struct sockaddr *)&myaddr, |
| sizeof(myaddr)); |
| if (ret) { |
| mlog(ML_ERROR, "bind failed with %d at address %pI4\n", |
| ret, &mynode->nd_ipv4_address); |
| goto out; |
| } |
| |
| ret = o2net_set_nodelay(sc->sc_sock); |
| if (ret) { |
| mlog(ML_ERROR, "setting TCP_NODELAY failed with %d\n", ret); |
| goto out; |
| } |
| |
| ret = o2net_set_usertimeout(sock); |
| if (ret) { |
| mlog(ML_ERROR, "set TCP_USER_TIMEOUT failed with %d\n", ret); |
| goto out; |
| } |
| |
| o2net_register_callbacks(sc->sc_sock->sk, sc); |
| |
| spin_lock(&nn->nn_lock); |
| /* handshake completion will set nn->nn_sc_valid */ |
| o2net_set_nn_state(nn, sc, 0, 0); |
| spin_unlock(&nn->nn_lock); |
| |
| remoteaddr.sin_family = AF_INET; |
| remoteaddr.sin_addr.s_addr = node->nd_ipv4_address; |
| remoteaddr.sin_port = node->nd_ipv4_port; |
| |
| ret = sc->sc_sock->ops->connect(sc->sc_sock, |
| (struct sockaddr *)&remoteaddr, |
| sizeof(remoteaddr), |
| O_NONBLOCK); |
| if (ret == -EINPROGRESS) |
| ret = 0; |
| |
| out: |
| if (ret && sc) { |
| printk(KERN_NOTICE "o2net: Connect attempt to " SC_NODEF_FMT |
| " failed with errno %d\n", SC_NODEF_ARGS(sc), ret); |
| /* 0 err so that another will be queued and attempted |
| * from set_nn_state */ |
| o2net_ensure_shutdown(nn, sc, 0); |
| } |
| if (sc) |
| sc_put(sc); |
| if (node) |
| o2nm_node_put(node); |
| if (mynode) |
| o2nm_node_put(mynode); |
| |
| return; |
| } |
| |
| static void o2net_connect_expired(struct work_struct *work) |
| { |
| struct o2net_node *nn = |
| container_of(work, struct o2net_node, nn_connect_expired.work); |
| |
| spin_lock(&nn->nn_lock); |
| if (!nn->nn_sc_valid) { |
| printk(KERN_NOTICE "o2net: No connection established with " |
| "node %u after %u.%u seconds, check network and" |
| " cluster configuration.\n", |
| o2net_num_from_nn(nn), |
| o2net_idle_timeout() / 1000, |
| o2net_idle_timeout() % 1000); |
| |
| o2net_set_nn_state(nn, NULL, 0, -ENOTCONN); |
| } |
| spin_unlock(&nn->nn_lock); |
| } |
| |
| static void o2net_still_up(struct work_struct *work) |
| { |
| struct o2net_node *nn = |
| container_of(work, struct o2net_node, nn_still_up.work); |
| |
| o2quo_hb_still_up(o2net_num_from_nn(nn)); |
| } |
| |
| /* ------------------------------------------------------------ */ |
| |
| void o2net_disconnect_node(struct o2nm_node *node) |
| { |
| struct o2net_node *nn = o2net_nn_from_num(node->nd_num); |
| |
| /* don't reconnect until it's heartbeating again */ |
| spin_lock(&nn->nn_lock); |
| atomic_set(&nn->nn_timeout, 0); |
| o2net_set_nn_state(nn, NULL, 0, -ENOTCONN); |
| spin_unlock(&nn->nn_lock); |
| |
| if (o2net_wq) { |
| cancel_delayed_work(&nn->nn_connect_expired); |
| cancel_delayed_work(&nn->nn_connect_work); |
| cancel_delayed_work(&nn->nn_still_up); |
| flush_workqueue(o2net_wq); |
| } |
| } |
| |
| static void o2net_hb_node_down_cb(struct o2nm_node *node, int node_num, |
| void *data) |
| { |
| o2quo_hb_down(node_num); |
| |
| if (!node) |
| return; |
| |
| if (node_num != o2nm_this_node()) |
| o2net_disconnect_node(node); |
| |
| BUG_ON(atomic_read(&o2net_connected_peers) < 0); |
| } |
| |
| static void o2net_hb_node_up_cb(struct o2nm_node *node, int node_num, |
| void *data) |
| { |
| struct o2net_node *nn = o2net_nn_from_num(node_num); |
| |
| o2quo_hb_up(node_num); |
| |
| BUG_ON(!node); |
| |
| /* ensure an immediate connect attempt */ |
| nn->nn_last_connect_attempt = jiffies - |
| (msecs_to_jiffies(o2net_reconnect_delay()) + 1); |
| |
| if (node_num != o2nm_this_node()) { |
| /* believe it or not, accept and node hearbeating testing |
| * can succeed for this node before we got here.. so |
| * only use set_nn_state to clear the persistent error |
| * if that hasn't already happened */ |
| spin_lock(&nn->nn_lock); |
| atomic_set(&nn->nn_timeout, 0); |
| if (nn->nn_persistent_error) |
| o2net_set_nn_state(nn, NULL, 0, 0); |
| spin_unlock(&nn->nn_lock); |
| } |
| } |
| |
| void o2net_unregister_hb_callbacks(void) |
| { |
| o2hb_unregister_callback(NULL, &o2net_hb_up); |
| o2hb_unregister_callback(NULL, &o2net_hb_down); |
| } |
| |
| int o2net_register_hb_callbacks(void) |
| { |
| int ret; |
| |
| o2hb_setup_callback(&o2net_hb_down, O2HB_NODE_DOWN_CB, |
| o2net_hb_node_down_cb, NULL, O2NET_HB_PRI); |
| o2hb_setup_callback(&o2net_hb_up, O2HB_NODE_UP_CB, |
| o2net_hb_node_up_cb, NULL, O2NET_HB_PRI); |
| |
| ret = o2hb_register_callback(NULL, &o2net_hb_up); |
| if (ret == 0) |
| ret = o2hb_register_callback(NULL, &o2net_hb_down); |
| |
| if (ret) |
| o2net_unregister_hb_callbacks(); |
| |
| return ret; |
| } |
| |
| /* ------------------------------------------------------------ */ |
| |
| static int o2net_accept_one(struct socket *sock, int *more) |
| { |
| int ret, slen; |
| struct sockaddr_in sin; |
| struct socket *new_sock = NULL; |
| struct o2nm_node *node = NULL; |
| struct o2nm_node *local_node = NULL; |
| struct o2net_sock_container *sc = NULL; |
| struct o2net_node *nn; |
| |
| BUG_ON(sock == NULL); |
| *more = 0; |
| ret = sock_create_lite(sock->sk->sk_family, sock->sk->sk_type, |
| sock->sk->sk_protocol, &new_sock); |
| if (ret) |
| goto out; |
| |
| new_sock->type = sock->type; |
| new_sock->ops = sock->ops; |
| ret = sock->ops->accept(sock, new_sock, O_NONBLOCK); |
| if (ret < 0) |
| goto out; |
| |
| *more = 1; |
| new_sock->sk->sk_allocation = GFP_ATOMIC; |
| |
| ret = o2net_set_nodelay(new_sock); |
| if (ret) { |
| mlog(ML_ERROR, "setting TCP_NODELAY failed with %d\n", ret); |
| goto out; |
| } |
| |
| ret = o2net_set_usertimeout(new_sock); |
| if (ret) { |
| mlog(ML_ERROR, "set TCP_USER_TIMEOUT failed with %d\n", ret); |
| goto out; |
| } |
| |
| slen = sizeof(sin); |
| ret = new_sock->ops->getname(new_sock, (struct sockaddr *) &sin, |
| &slen, 1); |
| if (ret < 0) |
| goto out; |
| |
| node = o2nm_get_node_by_ip(sin.sin_addr.s_addr); |
| if (node == NULL) { |
| printk(KERN_NOTICE "o2net: Attempt to connect from unknown " |
| "node at %pI4:%d\n", &sin.sin_addr.s_addr, |
| ntohs(sin.sin_port)); |
| ret = -EINVAL; |
| goto out; |
| } |
| |
| if (o2nm_this_node() >= node->nd_num) { |
| local_node = o2nm_get_node_by_num(o2nm_this_node()); |
| if (local_node) |
| printk(KERN_NOTICE "o2net: Unexpected connect attempt " |
| "seen at node '%s' (%u, %pI4:%d) from " |
| "node '%s' (%u, %pI4:%d)\n", |
| local_node->nd_name, local_node->nd_num, |
| &(local_node->nd_ipv4_address), |
| ntohs(local_node->nd_ipv4_port), |
| node->nd_name, |
| node->nd_num, &sin.sin_addr.s_addr, |
| ntohs(sin.sin_port)); |
| ret = -EINVAL; |
| goto out; |
| } |
| |
| /* this happens all the time when the other node sees our heartbeat |
| * and tries to connect before we see their heartbeat */ |
| if (!o2hb_check_node_heartbeating_from_callback(node->nd_num)) { |
| mlog(ML_CONN, "attempt to connect from node '%s' at " |
| "%pI4:%d but it isn't heartbeating\n", |
| node->nd_name, &sin.sin_addr.s_addr, |
| ntohs(sin.sin_port)); |
| ret = -EINVAL; |
| goto out; |
| } |
| |
| nn = o2net_nn_from_num(node->nd_num); |
| |
| spin_lock(&nn->nn_lock); |
| if (nn->nn_sc) |
| ret = -EBUSY; |
| else |
| ret = 0; |
| spin_unlock(&nn->nn_lock); |
| if (ret) { |
| printk(KERN_NOTICE "o2net: Attempt to connect from node '%s' " |
| "at %pI4:%d but it already has an open connection\n", |
| node->nd_name, &sin.sin_addr.s_addr, |
| ntohs(sin.sin_port)); |
| goto out; |
| } |
| |
| sc = sc_alloc(node); |
| if (sc == NULL) { |
| ret = -ENOMEM; |
| goto out; |
| } |
| |
| sc->sc_sock = new_sock; |
| new_sock = NULL; |
| |
| spin_lock(&nn->nn_lock); |
| atomic_set(&nn->nn_timeout, 0); |
| o2net_set_nn_state(nn, sc, 0, 0); |
| spin_unlock(&nn->nn_lock); |
| |
| o2net_register_callbacks(sc->sc_sock->sk, sc); |
| o2net_sc_queue_work(sc, &sc->sc_rx_work); |
| |
| o2net_initialize_handshake(); |
| o2net_sendpage(sc, o2net_hand, sizeof(*o2net_hand)); |
| |
| out: |
| if (new_sock) |
| sock_release(new_sock); |
| if (node) |
| o2nm_node_put(node); |
| if (local_node) |
| o2nm_node_put(local_node); |
| if (sc) |
| sc_put(sc); |
| return ret; |
| } |
| |
| /* |
| * This function is invoked in response to one or more |
| * pending accepts at softIRQ level. We must drain the |
| * entire que before returning. |
| */ |
| |
| static void o2net_accept_many(struct work_struct *work) |
| { |
| struct socket *sock = o2net_listen_sock; |
| int more; |
| int err; |
| |
| /* |
| * It is critical to note that due to interrupt moderation |
| * at the network driver level, we can't assume to get a |
| * softIRQ for every single conn since tcp SYN packets |
| * can arrive back-to-back, and therefore many pending |
| * accepts may result in just 1 softIRQ. If we terminate |
| * the o2net_accept_one() loop upon seeing an err, what happens |
| * to the rest of the conns in the queue? If no new SYN |
| * arrives for hours, no softIRQ will be delivered, |
| * and the connections will just sit in the queue. |
| */ |
| |
| for (;;) { |
| err = o2net_accept_one(sock, &more); |
| if (!more) |
| break; |
| cond_resched(); |
| } |
| } |
| |
| static void o2net_listen_data_ready(struct sock *sk) |
| { |
| void (*ready)(struct sock *sk); |
| |
| read_lock(&sk->sk_callback_lock); |
| ready = sk->sk_user_data; |
| if (ready == NULL) { /* check for teardown race */ |
| ready = sk->sk_data_ready; |
| goto out; |
| } |
| |
| /* This callback may called twice when a new connection |
| * is being established as a child socket inherits everything |
| * from a parent LISTEN socket, including the data_ready cb of |
| * the parent. This leads to a hazard. In o2net_accept_one() |
| * we are still initializing the child socket but have not |
| * changed the inherited data_ready callback yet when |
| * data starts arriving. |
| * We avoid this hazard by checking the state. |
| * For the listening socket, the state will be TCP_LISTEN; for the new |
| * socket, will be TCP_ESTABLISHED. Also, in this case, |
| * sk->sk_user_data is not a valid function pointer. |
| */ |
| |
| if (sk->sk_state == TCP_LISTEN) { |
| queue_work(o2net_wq, &o2net_listen_work); |
| } else { |
| ready = NULL; |
| } |
| |
| out: |
| read_unlock(&sk->sk_callback_lock); |
| if (ready != NULL) |
| ready(sk); |
| } |
| |
| static int o2net_open_listening_sock(__be32 addr, __be16 port) |
| { |
| struct socket *sock = NULL; |
| int ret; |
| struct sockaddr_in sin = { |
| .sin_family = PF_INET, |
| .sin_addr = { .s_addr = addr }, |
| .sin_port = port, |
| }; |
| |
| ret = sock_create(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock); |
| if (ret < 0) { |
| printk(KERN_ERR "o2net: Error %d while creating socket\n", ret); |
| goto out; |
| } |
| |
| sock->sk->sk_allocation = GFP_ATOMIC; |
| |
| write_lock_bh(&sock->sk->sk_callback_lock); |
| sock->sk->sk_user_data = sock->sk->sk_data_ready; |
| sock->sk->sk_data_ready = o2net_listen_data_ready; |
| write_unlock_bh(&sock->sk->sk_callback_lock); |
| |
| o2net_listen_sock = sock; |
| INIT_WORK(&o2net_listen_work, o2net_accept_many); |
| |
| sock->sk->sk_reuse = SK_CAN_REUSE; |
| ret = sock->ops->bind(sock, (struct sockaddr *)&sin, sizeof(sin)); |
| if (ret < 0) { |
| printk(KERN_ERR "o2net: Error %d while binding socket at " |
| "%pI4:%u\n", ret, &addr, ntohs(port)); |
| goto out; |
| } |
| |
| ret = sock->ops->listen(sock, 64); |
| if (ret < 0) |
| printk(KERN_ERR "o2net: Error %d while listening on %pI4:%u\n", |
| ret, &addr, ntohs(port)); |
| |
| out: |
| if (ret) { |
| o2net_listen_sock = NULL; |
| if (sock) |
| sock_release(sock); |
| } |
| return ret; |
| } |
| |
| /* |
| * called from node manager when we should bring up our network listening |
| * socket. node manager handles all the serialization to only call this |
| * once and to match it with o2net_stop_listening(). note, |
| * o2nm_this_node() doesn't work yet as we're being called while it |
| * is being set up. |
| */ |
| int o2net_start_listening(struct o2nm_node *node) |
| { |
| int ret = 0; |
| |
| BUG_ON(o2net_wq != NULL); |
| BUG_ON(o2net_listen_sock != NULL); |
| |
| mlog(ML_KTHREAD, "starting o2net thread...\n"); |
| o2net_wq = create_singlethread_workqueue("o2net"); |
| if (o2net_wq == NULL) { |
| mlog(ML_ERROR, "unable to launch o2net thread\n"); |
| return -ENOMEM; /* ? */ |
| } |
| |
| ret = o2net_open_listening_sock(node->nd_ipv4_address, |
| node->nd_ipv4_port); |
| if (ret) { |
| destroy_workqueue(o2net_wq); |
| o2net_wq = NULL; |
| } else |
| o2quo_conn_up(node->nd_num); |
| |
| return ret; |
| } |
| |
| /* again, o2nm_this_node() doesn't work here as we're involved in |
| * tearing it down */ |
| void o2net_stop_listening(struct o2nm_node *node) |
| { |
| struct socket *sock = o2net_listen_sock; |
| size_t i; |
| |
| BUG_ON(o2net_wq == NULL); |
| BUG_ON(o2net_listen_sock == NULL); |
| |
| /* stop the listening socket from generating work */ |
| write_lock_bh(&sock->sk->sk_callback_lock); |
| sock->sk->sk_data_ready = sock->sk->sk_user_data; |
| sock->sk->sk_user_data = NULL; |
| write_unlock_bh(&sock->sk->sk_callback_lock); |
| |
| for (i = 0; i < ARRAY_SIZE(o2net_nodes); i++) { |
| struct o2nm_node *node = o2nm_get_node_by_num(i); |
| if (node) { |
| o2net_disconnect_node(node); |
| o2nm_node_put(node); |
| } |
| } |
| |
| /* finish all work and tear down the work queue */ |
| mlog(ML_KTHREAD, "waiting for o2net thread to exit....\n"); |
| destroy_workqueue(o2net_wq); |
| o2net_wq = NULL; |
| |
| sock_release(o2net_listen_sock); |
| o2net_listen_sock = NULL; |
| |
| o2quo_conn_err(node->nd_num); |
| } |
| |
| /* ------------------------------------------------------------ */ |
| |
| int o2net_init(void) |
| { |
| unsigned long i; |
| |
| o2quo_init(); |
| |
| if (o2net_debugfs_init()) |
| goto out; |
| |
| o2net_hand = kzalloc(sizeof(struct o2net_handshake), GFP_KERNEL); |
| o2net_keep_req = kzalloc(sizeof(struct o2net_msg), GFP_KERNEL); |
| o2net_keep_resp = kzalloc(sizeof(struct o2net_msg), GFP_KERNEL); |
| if (!o2net_hand || !o2net_keep_req || !o2net_keep_resp) |
| goto out; |
| |
| o2net_hand->protocol_version = cpu_to_be64(O2NET_PROTOCOL_VERSION); |
| o2net_hand->connector_id = cpu_to_be64(1); |
| |
| o2net_keep_req->magic = cpu_to_be16(O2NET_MSG_KEEP_REQ_MAGIC); |
| o2net_keep_resp->magic = cpu_to_be16(O2NET_MSG_KEEP_RESP_MAGIC); |
| |
| for (i = 0; i < ARRAY_SIZE(o2net_nodes); i++) { |
| struct o2net_node *nn = o2net_nn_from_num(i); |
| |
| atomic_set(&nn->nn_timeout, 0); |
| spin_lock_init(&nn->nn_lock); |
| INIT_DELAYED_WORK(&nn->nn_connect_work, o2net_start_connect); |
| INIT_DELAYED_WORK(&nn->nn_connect_expired, |
| o2net_connect_expired); |
| INIT_DELAYED_WORK(&nn->nn_still_up, o2net_still_up); |
| /* until we see hb from a node we'll return einval */ |
| nn->nn_persistent_error = -ENOTCONN; |
| init_waitqueue_head(&nn->nn_sc_wq); |
| idr_init(&nn->nn_status_idr); |
| INIT_LIST_HEAD(&nn->nn_status_list); |
| } |
| |
| return 0; |
| |
| out: |
| kfree(o2net_hand); |
| kfree(o2net_keep_req); |
| kfree(o2net_keep_resp); |
| |
| o2quo_exit(); |
| return -ENOMEM; |
| } |
| |
| void o2net_exit(void) |
| { |
| o2quo_exit(); |
| kfree(o2net_hand); |
| kfree(o2net_keep_req); |
| kfree(o2net_keep_resp); |
| o2net_debugfs_exit(); |
| } |