Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1 | /* -*- mode: c; c-basic-offset: 8; -*- |
| 2 | * |
| 3 | * vim: noexpandtab sw=8 ts=8 sts=0: |
| 4 | * |
| 5 | * Copyright (C) 2004 Oracle. All rights reserved. |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU General Public |
| 9 | * License as published by the Free Software Foundation; either |
| 10 | * version 2 of the License, or (at your option) any later version. |
| 11 | * |
| 12 | * This program is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 15 | * General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public |
| 18 | * License along with this program; if not, write to the |
| 19 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
| 20 | * Boston, MA 021110-1307, USA. |
| 21 | * |
| 22 | * ---- |
| 23 | * |
| 24 | * Callers for this were originally written against a very simple synchronus |
| 25 | * API. This implementation reflects those simple callers. Some day I'm sure |
| 26 | * we'll need to move to a more robust posting/callback mechanism. |
| 27 | * |
| 28 | * Transmit calls pass in kernel virtual addresses and block copying this into |
| 29 | * the socket's tx buffers via a usual blocking sendmsg. They'll block waiting |
| 30 | * for a failed socket to timeout. TX callers can also pass in a poniter to an |
| 31 | * 'int' which gets filled with an errno off the wire in response to the |
| 32 | * message they send. |
| 33 | * |
| 34 | * Handlers for unsolicited messages are registered. Each socket has a page |
| 35 | * that incoming data is copied into. First the header, then the data. |
| 36 | * Handlers are called from only one thread with a reference to this per-socket |
| 37 | * page. This page is destroyed after the handler call, so it can't be |
| 38 | * referenced beyond the call. Handlers may block but are discouraged from |
| 39 | * doing so. |
| 40 | * |
| 41 | * Any framing errors (bad magic, large payload lengths) close a connection. |
| 42 | * |
| 43 | * Our sock_container holds the state we associate with a socket. It's current |
| 44 | * framing state is held there as well as the refcounting we do around when it |
| 45 | * is safe to tear down the socket. The socket is only finally torn down from |
| 46 | * the container when the container loses all of its references -- so as long |
| 47 | * as you hold a ref on the container you can trust that the socket is valid |
| 48 | * for use with kernel socket APIs. |
| 49 | * |
| 50 | * Connections are initiated between a pair of nodes when the node with the |
| 51 | * higher node number gets a heartbeat callback which indicates that the lower |
| 52 | * numbered node has started heartbeating. The lower numbered node is passive |
| 53 | * and only accepts the connection if the higher numbered node is heartbeating. |
| 54 | */ |
| 55 | |
| 56 | #include <linux/kernel.h> |
| 57 | #include <linux/jiffies.h> |
| 58 | #include <linux/slab.h> |
| 59 | #include <linux/idr.h> |
| 60 | #include <linux/kref.h> |
Trond Myklebust | 91cf45f | 2007-11-12 18:10:39 -0800 | [diff] [blame] | 61 | #include <linux/net.h> |
Paul Gortmaker | afeacc8 | 2011-05-26 16:00:52 -0400 | [diff] [blame] | 62 | #include <linux/export.h> |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 63 | #include <net/tcp.h> |
| 64 | |
| 65 | #include <asm/uaccess.h> |
| 66 | |
| 67 | #include "heartbeat.h" |
| 68 | #include "tcp.h" |
| 69 | #include "nodemanager.h" |
| 70 | #define MLOG_MASK_PREFIX ML_TCP |
| 71 | #include "masklog.h" |
| 72 | #include "quorum.h" |
| 73 | |
| 74 | #include "tcp_internal.h" |
| 75 | |
Joe Perches | 03affde | 2010-03-10 15:20:32 -0800 | [diff] [blame] | 76 | #define SC_NODEF_FMT "node %s (num %u) at %pI4:%u" |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 77 | #define SC_NODEF_ARGS(sc) sc->sc_node->nd_name, sc->sc_node->nd_num, \ |
Joe Perches | 03affde | 2010-03-10 15:20:32 -0800 | [diff] [blame] | 78 | &sc->sc_node->nd_ipv4_address, \ |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 79 | ntohs(sc->sc_node->nd_ipv4_port) |
| 80 | |
| 81 | /* |
| 82 | * In the following two log macros, the whitespace after the ',' just |
| 83 | * before ##args is intentional. Otherwise, gcc 2.95 will eat the |
| 84 | * previous token if args expands to nothing. |
| 85 | */ |
| 86 | #define msglog(hdr, fmt, args...) do { \ |
| 87 | typeof(hdr) __hdr = (hdr); \ |
| 88 | mlog(ML_MSG, "[mag %u len %u typ %u stat %d sys_stat %d " \ |
| 89 | "key %08x num %u] " fmt, \ |
| 90 | be16_to_cpu(__hdr->magic), be16_to_cpu(__hdr->data_len), \ |
| 91 | be16_to_cpu(__hdr->msg_type), be32_to_cpu(__hdr->status), \ |
| 92 | be32_to_cpu(__hdr->sys_status), be32_to_cpu(__hdr->key), \ |
| 93 | be32_to_cpu(__hdr->msg_num) , ##args); \ |
| 94 | } while (0) |
| 95 | |
| 96 | #define sclog(sc, fmt, args...) do { \ |
| 97 | typeof(sc) __sc = (sc); \ |
| 98 | mlog(ML_SOCKET, "[sc %p refs %d sock %p node %u page %p " \ |
| 99 | "pg_off %zu] " fmt, __sc, \ |
| 100 | atomic_read(&__sc->sc_kref.refcount), __sc->sc_sock, \ |
| 101 | __sc->sc_node->nd_num, __sc->sc_page, __sc->sc_page_off , \ |
| 102 | ##args); \ |
| 103 | } while (0) |
| 104 | |
Ingo Molnar | 34af946 | 2006-06-27 02:53:55 -0700 | [diff] [blame] | 105 | static DEFINE_RWLOCK(o2net_handler_lock); |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 106 | static struct rb_root o2net_handler_tree = RB_ROOT; |
| 107 | |
| 108 | static struct o2net_node o2net_nodes[O2NM_MAX_NODES]; |
| 109 | |
| 110 | /* XXX someday we'll need better accounting */ |
| 111 | static struct socket *o2net_listen_sock = NULL; |
| 112 | |
| 113 | /* |
| 114 | * listen work is only queued by the listening socket callbacks on the |
| 115 | * o2net_wq. teardown detaches the callbacks before destroying the workqueue. |
| 116 | * quorum work is queued as sock containers are shutdown.. stop_listening |
| 117 | * tears down all the node's sock containers, preventing future shutdowns |
| 118 | * and queued quroum work, before canceling delayed quorum work and |
| 119 | * destroying the work queue. |
| 120 | */ |
| 121 | static struct workqueue_struct *o2net_wq; |
| 122 | static struct work_struct o2net_listen_work; |
| 123 | |
| 124 | static struct o2hb_callback_func o2net_hb_up, o2net_hb_down; |
| 125 | #define O2NET_HB_PRI 0x1 |
| 126 | |
| 127 | static struct o2net_handshake *o2net_hand; |
| 128 | static struct o2net_msg *o2net_keep_req, *o2net_keep_resp; |
| 129 | |
| 130 | static int o2net_sys_err_translations[O2NET_ERR_MAX] = |
| 131 | {[O2NET_ERR_NONE] = 0, |
| 132 | [O2NET_ERR_NO_HNDLR] = -ENOPROTOOPT, |
| 133 | [O2NET_ERR_OVERFLOW] = -EOVERFLOW, |
| 134 | [O2NET_ERR_DIED] = -EHOSTDOWN,}; |
| 135 | |
| 136 | /* can't quite avoid *all* internal declarations :/ */ |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 137 | static void o2net_sc_connect_completed(struct work_struct *work); |
| 138 | static void o2net_rx_until_empty(struct work_struct *work); |
| 139 | static void o2net_shutdown_sc(struct work_struct *work); |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 140 | static void o2net_listen_data_ready(struct sock *sk, int bytes); |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 141 | static void o2net_sc_send_keep_req(struct work_struct *work); |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 142 | static void o2net_idle_timer(unsigned long data); |
| 143 | static void o2net_sc_postpone_idle(struct o2net_sock_container *sc); |
Jeff Mahoney | b5dd803 | 2006-12-04 14:04:54 +0100 | [diff] [blame] | 144 | static void o2net_sc_reset_idle_timer(struct o2net_sock_container *sc); |
| 145 | |
Sunil Mushran | 2309e9e | 2008-04-14 10:46:19 -0700 | [diff] [blame] | 146 | #ifdef CONFIG_DEBUG_FS |
Adrian Bunk | 18496e8 | 2008-08-07 00:11:12 +0300 | [diff] [blame] | 147 | static void o2net_init_nst(struct o2net_send_tracking *nst, u32 msgtype, |
| 148 | u32 msgkey, struct task_struct *task, u8 node) |
Sunil Mushran | 0f475b2 | 2008-05-12 18:31:37 -0700 | [diff] [blame] | 149 | { |
Sunil Mushran | 2309e9e | 2008-04-14 10:46:19 -0700 | [diff] [blame] | 150 | INIT_LIST_HEAD(&nst->st_net_debug_item); |
| 151 | nst->st_task = task; |
| 152 | nst->st_msg_type = msgtype; |
| 153 | nst->st_msg_key = msgkey; |
| 154 | nst->st_node = node; |
Sunil Mushran | 2309e9e | 2008-04-14 10:46:19 -0700 | [diff] [blame] | 155 | } |
| 156 | |
Sunil Mushran | ff1becb | 2010-12-22 12:39:39 -0800 | [diff] [blame] | 157 | static inline void o2net_set_nst_sock_time(struct o2net_send_tracking *nst) |
Sunil Mushran | 2309e9e | 2008-04-14 10:46:19 -0700 | [diff] [blame] | 158 | { |
Sunil Mushran | 3f9c14f | 2010-12-22 12:39:38 -0800 | [diff] [blame] | 159 | nst->st_sock_time = ktime_get(); |
Sunil Mushran | 2309e9e | 2008-04-14 10:46:19 -0700 | [diff] [blame] | 160 | } |
| 161 | |
Sunil Mushran | ff1becb | 2010-12-22 12:39:39 -0800 | [diff] [blame] | 162 | static inline void o2net_set_nst_send_time(struct o2net_send_tracking *nst) |
Sunil Mushran | 2309e9e | 2008-04-14 10:46:19 -0700 | [diff] [blame] | 163 | { |
Sunil Mushran | 3f9c14f | 2010-12-22 12:39:38 -0800 | [diff] [blame] | 164 | nst->st_send_time = ktime_get(); |
Sunil Mushran | 2309e9e | 2008-04-14 10:46:19 -0700 | [diff] [blame] | 165 | } |
| 166 | |
Adrian Bunk | 18496e8 | 2008-08-07 00:11:12 +0300 | [diff] [blame] | 167 | static inline void o2net_set_nst_status_time(struct o2net_send_tracking *nst) |
| 168 | { |
Sunil Mushran | ff1becb | 2010-12-22 12:39:39 -0800 | [diff] [blame] | 169 | nst->st_status_time = ktime_get(); |
Adrian Bunk | 18496e8 | 2008-08-07 00:11:12 +0300 | [diff] [blame] | 170 | } |
| 171 | |
| 172 | static inline void o2net_set_nst_sock_container(struct o2net_send_tracking *nst, |
| 173 | struct o2net_sock_container *sc) |
| 174 | { |
Sunil Mushran | ff1becb | 2010-12-22 12:39:39 -0800 | [diff] [blame] | 175 | nst->st_sc = sc; |
Adrian Bunk | 18496e8 | 2008-08-07 00:11:12 +0300 | [diff] [blame] | 176 | } |
| 177 | |
| 178 | static inline void o2net_set_nst_msg_id(struct o2net_send_tracking *nst, |
| 179 | u32 msg_id) |
| 180 | { |
Sunil Mushran | ff1becb | 2010-12-22 12:39:39 -0800 | [diff] [blame] | 181 | nst->st_id = msg_id; |
Adrian Bunk | 18496e8 | 2008-08-07 00:11:12 +0300 | [diff] [blame] | 182 | } |
| 183 | |
Sunil Mushran | ff1becb | 2010-12-22 12:39:39 -0800 | [diff] [blame] | 184 | static inline void o2net_set_sock_timer(struct o2net_sock_container *sc) |
| 185 | { |
| 186 | sc->sc_tv_timer = ktime_get(); |
| 187 | } |
| 188 | |
| 189 | static inline void o2net_set_data_ready_time(struct o2net_sock_container *sc) |
| 190 | { |
| 191 | sc->sc_tv_data_ready = ktime_get(); |
| 192 | } |
| 193 | |
| 194 | static inline void o2net_set_advance_start_time(struct o2net_sock_container *sc) |
| 195 | { |
| 196 | sc->sc_tv_advance_start = ktime_get(); |
| 197 | } |
| 198 | |
| 199 | static inline void o2net_set_advance_stop_time(struct o2net_sock_container *sc) |
| 200 | { |
| 201 | sc->sc_tv_advance_stop = ktime_get(); |
| 202 | } |
| 203 | |
| 204 | static inline void o2net_set_func_start_time(struct o2net_sock_container *sc) |
| 205 | { |
| 206 | sc->sc_tv_func_start = ktime_get(); |
| 207 | } |
| 208 | |
| 209 | static inline void o2net_set_func_stop_time(struct o2net_sock_container *sc) |
| 210 | { |
| 211 | sc->sc_tv_func_stop = ktime_get(); |
| 212 | } |
Sunil Mushran | e453039 | 2010-12-22 12:39:41 -0800 | [diff] [blame] | 213 | |
Sunil Mushran | ff1becb | 2010-12-22 12:39:39 -0800 | [diff] [blame] | 214 | #else /* CONFIG_DEBUG_FS */ |
| 215 | # define o2net_init_nst(a, b, c, d, e) |
| 216 | # define o2net_set_nst_sock_time(a) |
| 217 | # define o2net_set_nst_send_time(a) |
| 218 | # define o2net_set_nst_status_time(a) |
| 219 | # define o2net_set_nst_sock_container(a, b) |
| 220 | # define o2net_set_nst_msg_id(a, b) |
| 221 | # define o2net_set_sock_timer(a) |
| 222 | # define o2net_set_data_ready_time(a) |
| 223 | # define o2net_set_advance_start_time(a) |
| 224 | # define o2net_set_advance_stop_time(a) |
| 225 | # define o2net_set_func_start_time(a) |
| 226 | # define o2net_set_func_stop_time(a) |
Sunil Mushran | 0f475b2 | 2008-05-12 18:31:37 -0700 | [diff] [blame] | 227 | #endif /* CONFIG_DEBUG_FS */ |
Sunil Mushran | 2309e9e | 2008-04-14 10:46:19 -0700 | [diff] [blame] | 228 | |
Sunil Mushran | 3c193b3 | 2010-12-22 12:39:40 -0800 | [diff] [blame] | 229 | #ifdef CONFIG_OCFS2_FS_STATS |
Rakib Mullick | ed59992 | 2011-03-18 17:01:08 +0600 | [diff] [blame] | 230 | static ktime_t o2net_get_func_run_time(struct o2net_sock_container *sc) |
| 231 | { |
| 232 | return ktime_sub(sc->sc_tv_func_stop, sc->sc_tv_func_start); |
| 233 | } |
| 234 | |
Sunil Mushran | 3c193b3 | 2010-12-22 12:39:40 -0800 | [diff] [blame] | 235 | static void o2net_update_send_stats(struct o2net_send_tracking *nst, |
| 236 | struct o2net_sock_container *sc) |
| 237 | { |
| 238 | sc->sc_tv_status_total = ktime_add(sc->sc_tv_status_total, |
| 239 | ktime_sub(ktime_get(), |
| 240 | nst->st_status_time)); |
| 241 | sc->sc_tv_send_total = ktime_add(sc->sc_tv_send_total, |
| 242 | ktime_sub(nst->st_status_time, |
| 243 | nst->st_send_time)); |
| 244 | sc->sc_tv_acquiry_total = ktime_add(sc->sc_tv_acquiry_total, |
| 245 | ktime_sub(nst->st_send_time, |
| 246 | nst->st_sock_time)); |
| 247 | sc->sc_send_count++; |
| 248 | } |
| 249 | |
Sunil Mushran | e453039 | 2010-12-22 12:39:41 -0800 | [diff] [blame] | 250 | static void o2net_update_recv_stats(struct o2net_sock_container *sc) |
| 251 | { |
| 252 | sc->sc_tv_process_total = ktime_add(sc->sc_tv_process_total, |
| 253 | o2net_get_func_run_time(sc)); |
| 254 | sc->sc_recv_count++; |
| 255 | } |
| 256 | |
Sunil Mushran | 3c193b3 | 2010-12-22 12:39:40 -0800 | [diff] [blame] | 257 | #else |
| 258 | |
| 259 | # define o2net_update_send_stats(a, b) |
| 260 | |
Randy Dunlap | e70d845 | 2010-12-27 11:55:08 -0800 | [diff] [blame] | 261 | # define o2net_update_recv_stats(sc) |
| 262 | |
Sunil Mushran | 3c193b3 | 2010-12-22 12:39:40 -0800 | [diff] [blame] | 263 | #endif /* CONFIG_OCFS2_FS_STATS */ |
| 264 | |
Joseph Qi | 41b63ef | 2014-04-03 14:47:00 -0700 | [diff] [blame] | 265 | static inline unsigned int o2net_reconnect_delay(void) |
Jeff Mahoney | b5dd803 | 2006-12-04 14:04:54 +0100 | [diff] [blame] | 266 | { |
| 267 | return o2nm_single_cluster->cl_reconnect_delay_ms; |
| 268 | } |
| 269 | |
Joseph Qi | 41b63ef | 2014-04-03 14:47:00 -0700 | [diff] [blame] | 270 | static inline unsigned int o2net_keepalive_delay(void) |
Jeff Mahoney | b5dd803 | 2006-12-04 14:04:54 +0100 | [diff] [blame] | 271 | { |
| 272 | return o2nm_single_cluster->cl_keepalive_delay_ms; |
| 273 | } |
| 274 | |
Joseph Qi | 41b63ef | 2014-04-03 14:47:00 -0700 | [diff] [blame] | 275 | static inline unsigned int o2net_idle_timeout(void) |
Jeff Mahoney | b5dd803 | 2006-12-04 14:04:54 +0100 | [diff] [blame] | 276 | { |
| 277 | return o2nm_single_cluster->cl_idle_timeout_ms; |
| 278 | } |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 279 | |
| 280 | static inline int o2net_sys_err_to_errno(enum o2net_system_error err) |
| 281 | { |
| 282 | int trans; |
| 283 | BUG_ON(err >= O2NET_ERR_MAX); |
| 284 | trans = o2net_sys_err_translations[err]; |
| 285 | |
| 286 | /* Just in case we mess up the translation table above */ |
| 287 | BUG_ON(err != O2NET_ERR_NONE && trans == 0); |
| 288 | return trans; |
| 289 | } |
| 290 | |
| 291 | static struct o2net_node * o2net_nn_from_num(u8 node_num) |
| 292 | { |
| 293 | BUG_ON(node_num >= ARRAY_SIZE(o2net_nodes)); |
| 294 | return &o2net_nodes[node_num]; |
| 295 | } |
| 296 | |
| 297 | static u8 o2net_num_from_nn(struct o2net_node *nn) |
| 298 | { |
| 299 | BUG_ON(nn == NULL); |
| 300 | return nn - o2net_nodes; |
| 301 | } |
| 302 | |
| 303 | /* ------------------------------------------------------------ */ |
| 304 | |
| 305 | static int o2net_prep_nsw(struct o2net_node *nn, struct o2net_status_wait *nsw) |
| 306 | { |
Tejun Heo | 6b207ba | 2013-02-27 17:04:51 -0800 | [diff] [blame] | 307 | int ret; |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 308 | |
Tejun Heo | 6b207ba | 2013-02-27 17:04:51 -0800 | [diff] [blame] | 309 | spin_lock(&nn->nn_lock); |
| 310 | ret = idr_alloc(&nn->nn_status_idr, nsw, 0, 0, GFP_ATOMIC); |
| 311 | if (ret >= 0) { |
| 312 | nsw->ns_id = ret; |
| 313 | list_add_tail(&nsw->ns_node_item, &nn->nn_status_list); |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 314 | } |
Tejun Heo | 6b207ba | 2013-02-27 17:04:51 -0800 | [diff] [blame] | 315 | spin_unlock(&nn->nn_lock); |
| 316 | if (ret < 0) |
| 317 | return ret; |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 318 | |
Tejun Heo | 6b207ba | 2013-02-27 17:04:51 -0800 | [diff] [blame] | 319 | init_waitqueue_head(&nsw->ns_wq); |
| 320 | nsw->ns_sys_status = O2NET_ERR_NONE; |
| 321 | nsw->ns_status = 0; |
| 322 | return 0; |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 323 | } |
| 324 | |
| 325 | static void o2net_complete_nsw_locked(struct o2net_node *nn, |
| 326 | struct o2net_status_wait *nsw, |
| 327 | enum o2net_system_error sys_status, |
| 328 | s32 status) |
| 329 | { |
| 330 | assert_spin_locked(&nn->nn_lock); |
| 331 | |
| 332 | if (!list_empty(&nsw->ns_node_item)) { |
| 333 | list_del_init(&nsw->ns_node_item); |
| 334 | nsw->ns_sys_status = sys_status; |
| 335 | nsw->ns_status = status; |
| 336 | idr_remove(&nn->nn_status_idr, nsw->ns_id); |
| 337 | wake_up(&nsw->ns_wq); |
| 338 | } |
| 339 | } |
| 340 | |
| 341 | static void o2net_complete_nsw(struct o2net_node *nn, |
| 342 | struct o2net_status_wait *nsw, |
| 343 | u64 id, enum o2net_system_error sys_status, |
| 344 | s32 status) |
| 345 | { |
| 346 | spin_lock(&nn->nn_lock); |
| 347 | if (nsw == NULL) { |
| 348 | if (id > INT_MAX) |
| 349 | goto out; |
| 350 | |
| 351 | nsw = idr_find(&nn->nn_status_idr, id); |
| 352 | if (nsw == NULL) |
| 353 | goto out; |
| 354 | } |
| 355 | |
| 356 | o2net_complete_nsw_locked(nn, nsw, sys_status, status); |
| 357 | |
| 358 | out: |
| 359 | spin_unlock(&nn->nn_lock); |
| 360 | return; |
| 361 | } |
| 362 | |
| 363 | static void o2net_complete_nodes_nsw(struct o2net_node *nn) |
| 364 | { |
Christoph Hellwig | 800deef | 2007-05-17 16:03:13 +0200 | [diff] [blame] | 365 | struct o2net_status_wait *nsw, *tmp; |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 366 | unsigned int num_kills = 0; |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 367 | |
| 368 | assert_spin_locked(&nn->nn_lock); |
| 369 | |
Christoph Hellwig | 800deef | 2007-05-17 16:03:13 +0200 | [diff] [blame] | 370 | list_for_each_entry_safe(nsw, tmp, &nn->nn_status_list, ns_node_item) { |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 371 | o2net_complete_nsw_locked(nn, nsw, O2NET_ERR_DIED, 0); |
| 372 | num_kills++; |
| 373 | } |
| 374 | |
| 375 | mlog(0, "completed %d messages for node %u\n", num_kills, |
| 376 | o2net_num_from_nn(nn)); |
| 377 | } |
| 378 | |
| 379 | static int o2net_nsw_completed(struct o2net_node *nn, |
| 380 | struct o2net_status_wait *nsw) |
| 381 | { |
| 382 | int completed; |
| 383 | spin_lock(&nn->nn_lock); |
| 384 | completed = list_empty(&nsw->ns_node_item); |
| 385 | spin_unlock(&nn->nn_lock); |
| 386 | return completed; |
| 387 | } |
| 388 | |
| 389 | /* ------------------------------------------------------------ */ |
| 390 | |
| 391 | static void sc_kref_release(struct kref *kref) |
| 392 | { |
| 393 | struct o2net_sock_container *sc = container_of(kref, |
| 394 | struct o2net_sock_container, sc_kref); |
Jeff Mahoney | b5dd803 | 2006-12-04 14:04:54 +0100 | [diff] [blame] | 395 | BUG_ON(timer_pending(&sc->sc_idle_timeout)); |
| 396 | |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 397 | sclog(sc, "releasing\n"); |
| 398 | |
| 399 | if (sc->sc_sock) { |
| 400 | sock_release(sc->sc_sock); |
| 401 | sc->sc_sock = NULL; |
| 402 | } |
| 403 | |
Sunil Mushran | 2b190ce | 2010-12-14 14:14:27 -0800 | [diff] [blame] | 404 | o2nm_undepend_item(&sc->sc_node->nd_item); |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 405 | o2nm_node_put(sc->sc_node); |
| 406 | sc->sc_node = NULL; |
| 407 | |
Sunil Mushran | 2309e9e | 2008-04-14 10:46:19 -0700 | [diff] [blame] | 408 | o2net_debug_del_sc(sc); |
Younger Liu | d3e3b41 | 2013-07-03 15:00:54 -0700 | [diff] [blame] | 409 | |
| 410 | if (sc->sc_page) |
| 411 | __free_page(sc->sc_page); |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 412 | kfree(sc); |
| 413 | } |
| 414 | |
| 415 | static void sc_put(struct o2net_sock_container *sc) |
| 416 | { |
| 417 | sclog(sc, "put\n"); |
| 418 | kref_put(&sc->sc_kref, sc_kref_release); |
| 419 | } |
| 420 | static void sc_get(struct o2net_sock_container *sc) |
| 421 | { |
| 422 | sclog(sc, "get\n"); |
| 423 | kref_get(&sc->sc_kref); |
| 424 | } |
| 425 | static struct o2net_sock_container *sc_alloc(struct o2nm_node *node) |
| 426 | { |
| 427 | struct o2net_sock_container *sc, *ret = NULL; |
| 428 | struct page *page = NULL; |
Sunil Mushran | 2b190ce | 2010-12-14 14:14:27 -0800 | [diff] [blame] | 429 | int status = 0; |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 430 | |
| 431 | page = alloc_page(GFP_NOFS); |
Robert P. J. Day | cd86128 | 2006-12-13 00:34:52 -0800 | [diff] [blame] | 432 | sc = kzalloc(sizeof(*sc), GFP_NOFS); |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 433 | if (sc == NULL || page == NULL) |
| 434 | goto out; |
| 435 | |
| 436 | kref_init(&sc->sc_kref); |
| 437 | o2nm_node_get(node); |
| 438 | sc->sc_node = node; |
| 439 | |
Sunil Mushran | 2b190ce | 2010-12-14 14:14:27 -0800 | [diff] [blame] | 440 | /* pin the node item of the remote node */ |
| 441 | status = o2nm_depend_item(&node->nd_item); |
| 442 | if (status) { |
| 443 | mlog_errno(status); |
| 444 | o2nm_node_put(node); |
| 445 | goto out; |
| 446 | } |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 447 | INIT_WORK(&sc->sc_connect_work, o2net_sc_connect_completed); |
| 448 | INIT_WORK(&sc->sc_rx_work, o2net_rx_until_empty); |
| 449 | INIT_WORK(&sc->sc_shutdown_work, o2net_shutdown_sc); |
| 450 | INIT_DELAYED_WORK(&sc->sc_keepalive_work, o2net_sc_send_keep_req); |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 451 | |
| 452 | init_timer(&sc->sc_idle_timeout); |
| 453 | sc->sc_idle_timeout.function = o2net_idle_timer; |
| 454 | sc->sc_idle_timeout.data = (unsigned long)sc; |
| 455 | |
| 456 | sclog(sc, "alloced\n"); |
| 457 | |
| 458 | ret = sc; |
| 459 | sc->sc_page = page; |
Sunil Mushran | 2309e9e | 2008-04-14 10:46:19 -0700 | [diff] [blame] | 460 | o2net_debug_add_sc(sc); |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 461 | sc = NULL; |
| 462 | page = NULL; |
| 463 | |
| 464 | out: |
| 465 | if (page) |
| 466 | __free_page(page); |
| 467 | kfree(sc); |
| 468 | |
| 469 | return ret; |
| 470 | } |
| 471 | |
| 472 | /* ------------------------------------------------------------ */ |
| 473 | |
| 474 | static void o2net_sc_queue_work(struct o2net_sock_container *sc, |
| 475 | struct work_struct *work) |
| 476 | { |
| 477 | sc_get(sc); |
| 478 | if (!queue_work(o2net_wq, work)) |
| 479 | sc_put(sc); |
| 480 | } |
| 481 | static void o2net_sc_queue_delayed_work(struct o2net_sock_container *sc, |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 482 | struct delayed_work *work, |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 483 | int delay) |
| 484 | { |
| 485 | sc_get(sc); |
| 486 | if (!queue_delayed_work(o2net_wq, work, delay)) |
| 487 | sc_put(sc); |
| 488 | } |
| 489 | static void o2net_sc_cancel_delayed_work(struct o2net_sock_container *sc, |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 490 | struct delayed_work *work) |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 491 | { |
| 492 | if (cancel_delayed_work(work)) |
| 493 | sc_put(sc); |
| 494 | } |
| 495 | |
Andrew Beekhof | 828ae6a | 2006-12-04 14:04:55 +0100 | [diff] [blame] | 496 | static atomic_t o2net_connected_peers = ATOMIC_INIT(0); |
| 497 | |
| 498 | int o2net_num_connected_peers(void) |
| 499 | { |
| 500 | return atomic_read(&o2net_connected_peers); |
| 501 | } |
| 502 | |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 503 | static void o2net_set_nn_state(struct o2net_node *nn, |
| 504 | struct o2net_sock_container *sc, |
| 505 | unsigned valid, int err) |
| 506 | { |
| 507 | int was_valid = nn->nn_sc_valid; |
| 508 | int was_err = nn->nn_persistent_error; |
| 509 | struct o2net_sock_container *old_sc = nn->nn_sc; |
| 510 | |
| 511 | assert_spin_locked(&nn->nn_lock); |
| 512 | |
Andrew Beekhof | 828ae6a | 2006-12-04 14:04:55 +0100 | [diff] [blame] | 513 | if (old_sc && !sc) |
| 514 | atomic_dec(&o2net_connected_peers); |
| 515 | else if (!old_sc && sc) |
| 516 | atomic_inc(&o2net_connected_peers); |
| 517 | |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 518 | /* the node num comparison and single connect/accept path should stop |
| 519 | * an non-null sc from being overwritten with another */ |
| 520 | BUG_ON(sc && nn->nn_sc && nn->nn_sc != sc); |
| 521 | mlog_bug_on_msg(err && valid, "err %d valid %u\n", err, valid); |
| 522 | mlog_bug_on_msg(valid && !sc, "valid %u sc %p\n", valid, sc); |
| 523 | |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 524 | if (was_valid && !valid && err == 0) |
| 525 | err = -ENOTCONN; |
| 526 | |
| 527 | mlog(ML_CONN, "node %u sc: %p -> %p, valid %u -> %u, err %d -> %d\n", |
| 528 | o2net_num_from_nn(nn), nn->nn_sc, sc, nn->nn_sc_valid, valid, |
| 529 | nn->nn_persistent_error, err); |
| 530 | |
| 531 | nn->nn_sc = sc; |
| 532 | nn->nn_sc_valid = valid ? 1 : 0; |
| 533 | nn->nn_persistent_error = err; |
| 534 | |
| 535 | /* mirrors o2net_tx_can_proceed() */ |
| 536 | if (nn->nn_persistent_error || nn->nn_sc_valid) |
| 537 | wake_up(&nn->nn_sc_wq); |
| 538 | |
| 539 | if (!was_err && nn->nn_persistent_error) { |
| 540 | o2quo_conn_err(o2net_num_from_nn(nn)); |
| 541 | queue_delayed_work(o2net_wq, &nn->nn_still_up, |
| 542 | msecs_to_jiffies(O2NET_QUORUM_DELAY_MS)); |
| 543 | } |
| 544 | |
| 545 | if (was_valid && !valid) { |
Sunil Mushran | 8dd7903 | 2013-09-11 14:19:49 -0700 | [diff] [blame] | 546 | if (old_sc) |
| 547 | printk(KERN_NOTICE "o2net: No longer connected to " |
| 548 | SC_NODEF_FMT "\n", SC_NODEF_ARGS(old_sc)); |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 549 | o2net_complete_nodes_nsw(nn); |
| 550 | } |
| 551 | |
| 552 | if (!was_valid && valid) { |
| 553 | o2quo_conn_up(o2net_num_from_nn(nn)); |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 554 | cancel_delayed_work(&nn->nn_connect_expired); |
Sunil Mushran | 6efd806 | 2010-02-05 15:41:23 -0800 | [diff] [blame] | 555 | printk(KERN_NOTICE "o2net: %s " SC_NODEF_FMT "\n", |
Sunil Mushran | 781ee3e | 2006-04-27 16:41:31 -0700 | [diff] [blame] | 556 | o2nm_this_node() > sc->sc_node->nd_num ? |
Sunil Mushran | 1dfecf8 | 2011-07-24 10:22:54 -0700 | [diff] [blame] | 557 | "Connected to" : "Accepted connection from", |
Sunil Mushran | 781ee3e | 2006-04-27 16:41:31 -0700 | [diff] [blame] | 558 | SC_NODEF_ARGS(sc)); |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 559 | } |
| 560 | |
| 561 | /* trigger the connecting worker func as long as we're not valid, |
| 562 | * it will back off if it shouldn't connect. This can be called |
| 563 | * from node config teardown and so needs to be careful about |
| 564 | * the work queue actually being up. */ |
| 565 | if (!valid && o2net_wq) { |
| 566 | unsigned long delay; |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 567 | /* delay if we're within a RECONNECT_DELAY of the |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 568 | * last attempt */ |
| 569 | delay = (nn->nn_last_connect_attempt + |
Jeff Mahoney | 409753b | 2008-03-28 16:44:13 -0700 | [diff] [blame] | 570 | msecs_to_jiffies(o2net_reconnect_delay())) |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 571 | - jiffies; |
Jeff Mahoney | 409753b | 2008-03-28 16:44:13 -0700 | [diff] [blame] | 572 | if (delay > msecs_to_jiffies(o2net_reconnect_delay())) |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 573 | delay = 0; |
| 574 | mlog(ML_CONN, "queueing conn attempt in %lu jiffies\n", delay); |
| 575 | queue_delayed_work(o2net_wq, &nn->nn_connect_work, delay); |
Tao Ma | 5cc3bf2 | 2008-03-05 15:50:12 +0800 | [diff] [blame] | 576 | |
| 577 | /* |
| 578 | * Delay the expired work after idle timeout. |
| 579 | * |
| 580 | * We might have lots of failed connection attempts that run |
| 581 | * through here but we only cancel the connect_expired work when |
| 582 | * a connection attempt succeeds. So only the first enqueue of |
| 583 | * the connect_expired work will do anything. The rest will see |
| 584 | * that it's already queued and do nothing. |
| 585 | */ |
Jeff Mahoney | 409753b | 2008-03-28 16:44:13 -0700 | [diff] [blame] | 586 | delay += msecs_to_jiffies(o2net_idle_timeout()); |
Tao Ma | 5cc3bf2 | 2008-03-05 15:50:12 +0800 | [diff] [blame] | 587 | queue_delayed_work(o2net_wq, &nn->nn_connect_expired, delay); |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 588 | } |
| 589 | |
| 590 | /* keep track of the nn's sc ref for the caller */ |
| 591 | if ((old_sc == NULL) && sc) |
| 592 | sc_get(sc); |
| 593 | if (old_sc && (old_sc != sc)) { |
| 594 | o2net_sc_queue_work(old_sc, &old_sc->sc_shutdown_work); |
| 595 | sc_put(old_sc); |
| 596 | } |
| 597 | } |
| 598 | |
| 599 | /* see o2net_register_callbacks() */ |
| 600 | static void o2net_data_ready(struct sock *sk, int bytes) |
| 601 | { |
| 602 | void (*ready)(struct sock *sk, int bytes); |
| 603 | |
| 604 | read_lock(&sk->sk_callback_lock); |
| 605 | if (sk->sk_user_data) { |
| 606 | struct o2net_sock_container *sc = sk->sk_user_data; |
| 607 | sclog(sc, "data_ready hit\n"); |
Sunil Mushran | ff1becb | 2010-12-22 12:39:39 -0800 | [diff] [blame] | 608 | o2net_set_data_ready_time(sc); |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 609 | o2net_sc_queue_work(sc, &sc->sc_rx_work); |
| 610 | ready = sc->sc_data_ready; |
| 611 | } else { |
| 612 | ready = sk->sk_data_ready; |
| 613 | } |
| 614 | read_unlock(&sk->sk_callback_lock); |
| 615 | |
| 616 | ready(sk, bytes); |
| 617 | } |
| 618 | |
| 619 | /* see o2net_register_callbacks() */ |
| 620 | static void o2net_state_change(struct sock *sk) |
| 621 | { |
| 622 | void (*state_change)(struct sock *sk); |
| 623 | struct o2net_sock_container *sc; |
| 624 | |
| 625 | read_lock(&sk->sk_callback_lock); |
| 626 | sc = sk->sk_user_data; |
| 627 | if (sc == NULL) { |
| 628 | state_change = sk->sk_state_change; |
| 629 | goto out; |
| 630 | } |
| 631 | |
| 632 | sclog(sc, "state_change to %d\n", sk->sk_state); |
| 633 | |
| 634 | state_change = sc->sc_state_change; |
| 635 | |
| 636 | switch(sk->sk_state) { |
Jie Liu | 44e89cb | 2013-07-03 15:01:08 -0700 | [diff] [blame] | 637 | /* ignore connecting sockets as they make progress */ |
| 638 | case TCP_SYN_SENT: |
| 639 | case TCP_SYN_RECV: |
| 640 | break; |
| 641 | case TCP_ESTABLISHED: |
| 642 | o2net_sc_queue_work(sc, &sc->sc_connect_work); |
| 643 | break; |
| 644 | default: |
| 645 | printk(KERN_INFO "o2net: Connection to " SC_NODEF_FMT |
| 646 | " shutdown, state %d\n", |
| 647 | SC_NODEF_ARGS(sc), sk->sk_state); |
| 648 | o2net_sc_queue_work(sc, &sc->sc_shutdown_work); |
| 649 | break; |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 650 | } |
| 651 | out: |
| 652 | read_unlock(&sk->sk_callback_lock); |
| 653 | state_change(sk); |
| 654 | } |
| 655 | |
| 656 | /* |
| 657 | * we register callbacks so we can queue work on events before calling |
| 658 | * the original callbacks. our callbacks our careful to test user_data |
| 659 | * to discover when they've reaced with o2net_unregister_callbacks(). |
| 660 | */ |
| 661 | static void o2net_register_callbacks(struct sock *sk, |
| 662 | struct o2net_sock_container *sc) |
| 663 | { |
| 664 | write_lock_bh(&sk->sk_callback_lock); |
| 665 | |
| 666 | /* accepted sockets inherit the old listen socket data ready */ |
| 667 | if (sk->sk_data_ready == o2net_listen_data_ready) { |
| 668 | sk->sk_data_ready = sk->sk_user_data; |
| 669 | sk->sk_user_data = NULL; |
| 670 | } |
| 671 | |
| 672 | BUG_ON(sk->sk_user_data != NULL); |
| 673 | sk->sk_user_data = sc; |
| 674 | sc_get(sc); |
| 675 | |
| 676 | sc->sc_data_ready = sk->sk_data_ready; |
| 677 | sc->sc_state_change = sk->sk_state_change; |
| 678 | sk->sk_data_ready = o2net_data_ready; |
| 679 | sk->sk_state_change = o2net_state_change; |
| 680 | |
Zhen Wei | 925037b | 2007-01-23 17:19:59 -0800 | [diff] [blame] | 681 | mutex_init(&sc->sc_send_lock); |
| 682 | |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 683 | write_unlock_bh(&sk->sk_callback_lock); |
| 684 | } |
| 685 | |
| 686 | static int o2net_unregister_callbacks(struct sock *sk, |
| 687 | struct o2net_sock_container *sc) |
| 688 | { |
| 689 | int ret = 0; |
| 690 | |
| 691 | write_lock_bh(&sk->sk_callback_lock); |
| 692 | if (sk->sk_user_data == sc) { |
| 693 | ret = 1; |
| 694 | sk->sk_user_data = NULL; |
| 695 | sk->sk_data_ready = sc->sc_data_ready; |
| 696 | sk->sk_state_change = sc->sc_state_change; |
| 697 | } |
| 698 | write_unlock_bh(&sk->sk_callback_lock); |
| 699 | |
| 700 | return ret; |
| 701 | } |
| 702 | |
| 703 | /* |
| 704 | * this is a little helper that is called by callers who have seen a problem |
| 705 | * with an sc and want to detach it from the nn if someone already hasn't beat |
| 706 | * them to it. if an error is given then the shutdown will be persistent |
| 707 | * and pending transmits will be canceled. |
| 708 | */ |
| 709 | static void o2net_ensure_shutdown(struct o2net_node *nn, |
| 710 | struct o2net_sock_container *sc, |
| 711 | int err) |
| 712 | { |
| 713 | spin_lock(&nn->nn_lock); |
| 714 | if (nn->nn_sc == sc) |
| 715 | o2net_set_nn_state(nn, NULL, 0, err); |
| 716 | spin_unlock(&nn->nn_lock); |
| 717 | } |
| 718 | |
| 719 | /* |
| 720 | * This work queue function performs the blocking parts of socket shutdown. A |
| 721 | * few paths lead here. set_nn_state will trigger this callback if it sees an |
| 722 | * sc detached from the nn. state_change will also trigger this callback |
| 723 | * directly when it sees errors. In that case we need to call set_nn_state |
| 724 | * ourselves as state_change couldn't get the nn_lock and call set_nn_state |
| 725 | * itself. |
| 726 | */ |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 727 | static void o2net_shutdown_sc(struct work_struct *work) |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 728 | { |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 729 | struct o2net_sock_container *sc = |
| 730 | container_of(work, struct o2net_sock_container, |
| 731 | sc_shutdown_work); |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 732 | struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num); |
| 733 | |
| 734 | sclog(sc, "shutting down\n"); |
| 735 | |
| 736 | /* drop the callbacks ref and call shutdown only once */ |
| 737 | if (o2net_unregister_callbacks(sc->sc_sock->sk, sc)) { |
| 738 | /* we shouldn't flush as we're in the thread, the |
| 739 | * races with pending sc work structs are harmless */ |
| 740 | del_timer_sync(&sc->sc_idle_timeout); |
| 741 | o2net_sc_cancel_delayed_work(sc, &sc->sc_keepalive_work); |
| 742 | sc_put(sc); |
Trond Myklebust | 91cf45f | 2007-11-12 18:10:39 -0800 | [diff] [blame] | 743 | kernel_sock_shutdown(sc->sc_sock, SHUT_RDWR); |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 744 | } |
| 745 | |
| 746 | /* not fatal so failed connects before the other guy has our |
| 747 | * heartbeat can be retried */ |
| 748 | o2net_ensure_shutdown(nn, sc, 0); |
| 749 | sc_put(sc); |
| 750 | } |
| 751 | |
| 752 | /* ------------------------------------------------------------ */ |
| 753 | |
| 754 | static int o2net_handler_cmp(struct o2net_msg_handler *nmh, u32 msg_type, |
| 755 | u32 key) |
| 756 | { |
| 757 | int ret = memcmp(&nmh->nh_key, &key, sizeof(key)); |
| 758 | |
| 759 | if (ret == 0) |
| 760 | ret = memcmp(&nmh->nh_msg_type, &msg_type, sizeof(msg_type)); |
| 761 | |
| 762 | return ret; |
| 763 | } |
| 764 | |
| 765 | static struct o2net_msg_handler * |
| 766 | o2net_handler_tree_lookup(u32 msg_type, u32 key, struct rb_node ***ret_p, |
| 767 | struct rb_node **ret_parent) |
| 768 | { |
Joseph Qi | 9a239e4 | 2013-09-11 14:20:00 -0700 | [diff] [blame] | 769 | struct rb_node **p = &o2net_handler_tree.rb_node; |
| 770 | struct rb_node *parent = NULL; |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 771 | struct o2net_msg_handler *nmh, *ret = NULL; |
| 772 | int cmp; |
| 773 | |
Joseph Qi | 9a239e4 | 2013-09-11 14:20:00 -0700 | [diff] [blame] | 774 | while (*p) { |
| 775 | parent = *p; |
| 776 | nmh = rb_entry(parent, struct o2net_msg_handler, nh_node); |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 777 | cmp = o2net_handler_cmp(nmh, msg_type, key); |
| 778 | |
Joseph Qi | 9a239e4 | 2013-09-11 14:20:00 -0700 | [diff] [blame] | 779 | if (cmp < 0) |
| 780 | p = &(*p)->rb_left; |
| 781 | else if (cmp > 0) |
| 782 | p = &(*p)->rb_right; |
| 783 | else { |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 784 | ret = nmh; |
Joseph Qi | 9a239e4 | 2013-09-11 14:20:00 -0700 | [diff] [blame] | 785 | break; |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 786 | } |
Joseph Qi | 9a239e4 | 2013-09-11 14:20:00 -0700 | [diff] [blame] | 787 | } |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 788 | |
Joseph Qi | 9a239e4 | 2013-09-11 14:20:00 -0700 | [diff] [blame] | 789 | if (ret_p != NULL) |
| 790 | *ret_p = p; |
| 791 | if (ret_parent != NULL) |
| 792 | *ret_parent = parent; |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 793 | |
Joseph Qi | 9a239e4 | 2013-09-11 14:20:00 -0700 | [diff] [blame] | 794 | return ret; |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 795 | } |
| 796 | |
| 797 | static void o2net_handler_kref_release(struct kref *kref) |
| 798 | { |
| 799 | struct o2net_msg_handler *nmh; |
| 800 | nmh = container_of(kref, struct o2net_msg_handler, nh_kref); |
| 801 | |
| 802 | kfree(nmh); |
| 803 | } |
| 804 | |
| 805 | static void o2net_handler_put(struct o2net_msg_handler *nmh) |
| 806 | { |
| 807 | kref_put(&nmh->nh_kref, o2net_handler_kref_release); |
| 808 | } |
| 809 | |
| 810 | /* max_len is protection for the handler func. incoming messages won't |
| 811 | * be given to the handler if their payload is longer than the max. */ |
| 812 | int o2net_register_handler(u32 msg_type, u32 key, u32 max_len, |
| 813 | o2net_msg_handler_func *func, void *data, |
Kurt Hackel | d74c980 | 2007-01-17 17:04:25 -0800 | [diff] [blame] | 814 | o2net_post_msg_handler_func *post_func, |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 815 | struct list_head *unreg_list) |
| 816 | { |
| 817 | struct o2net_msg_handler *nmh = NULL; |
| 818 | struct rb_node **p, *parent; |
| 819 | int ret = 0; |
| 820 | |
| 821 | if (max_len > O2NET_MAX_PAYLOAD_BYTES) { |
| 822 | mlog(0, "max_len for message handler out of range: %u\n", |
| 823 | max_len); |
| 824 | ret = -EINVAL; |
| 825 | goto out; |
| 826 | } |
| 827 | |
| 828 | if (!msg_type) { |
| 829 | mlog(0, "no message type provided: %u, %p\n", msg_type, func); |
| 830 | ret = -EINVAL; |
| 831 | goto out; |
| 832 | |
| 833 | } |
| 834 | if (!func) { |
| 835 | mlog(0, "no message handler provided: %u, %p\n", |
| 836 | msg_type, func); |
| 837 | ret = -EINVAL; |
| 838 | goto out; |
| 839 | } |
| 840 | |
Robert P. J. Day | cd86128 | 2006-12-13 00:34:52 -0800 | [diff] [blame] | 841 | nmh = kzalloc(sizeof(struct o2net_msg_handler), GFP_NOFS); |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 842 | if (nmh == NULL) { |
| 843 | ret = -ENOMEM; |
| 844 | goto out; |
| 845 | } |
| 846 | |
| 847 | nmh->nh_func = func; |
| 848 | nmh->nh_func_data = data; |
Kurt Hackel | d74c980 | 2007-01-17 17:04:25 -0800 | [diff] [blame] | 849 | nmh->nh_post_func = post_func; |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 850 | nmh->nh_msg_type = msg_type; |
| 851 | nmh->nh_max_len = max_len; |
| 852 | nmh->nh_key = key; |
| 853 | /* the tree and list get this ref.. they're both removed in |
| 854 | * unregister when this ref is dropped */ |
| 855 | kref_init(&nmh->nh_kref); |
| 856 | INIT_LIST_HEAD(&nmh->nh_unregister_item); |
| 857 | |
| 858 | write_lock(&o2net_handler_lock); |
| 859 | if (o2net_handler_tree_lookup(msg_type, key, &p, &parent)) |
| 860 | ret = -EEXIST; |
| 861 | else { |
| 862 | rb_link_node(&nmh->nh_node, parent, p); |
| 863 | rb_insert_color(&nmh->nh_node, &o2net_handler_tree); |
| 864 | list_add_tail(&nmh->nh_unregister_item, unreg_list); |
| 865 | |
| 866 | mlog(ML_TCP, "registered handler func %p type %u key %08x\n", |
| 867 | func, msg_type, key); |
| 868 | /* we've had some trouble with handlers seemingly vanishing. */ |
| 869 | mlog_bug_on_msg(o2net_handler_tree_lookup(msg_type, key, &p, |
| 870 | &parent) == NULL, |
Masanari Iida | 8a168ca | 2012-12-29 02:00:09 +0900 | [diff] [blame] | 871 | "couldn't find handler we *just* registered " |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 872 | "for type %u key %08x\n", msg_type, key); |
| 873 | } |
| 874 | write_unlock(&o2net_handler_lock); |
| 875 | if (ret) |
| 876 | goto out; |
| 877 | |
| 878 | out: |
| 879 | if (ret) |
| 880 | kfree(nmh); |
| 881 | |
| 882 | return ret; |
| 883 | } |
| 884 | EXPORT_SYMBOL_GPL(o2net_register_handler); |
| 885 | |
| 886 | void o2net_unregister_handler_list(struct list_head *list) |
| 887 | { |
Christoph Hellwig | 800deef | 2007-05-17 16:03:13 +0200 | [diff] [blame] | 888 | struct o2net_msg_handler *nmh, *n; |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 889 | |
| 890 | write_lock(&o2net_handler_lock); |
Christoph Hellwig | 800deef | 2007-05-17 16:03:13 +0200 | [diff] [blame] | 891 | list_for_each_entry_safe(nmh, n, list, nh_unregister_item) { |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 892 | mlog(ML_TCP, "unregistering handler func %p type %u key %08x\n", |
| 893 | nmh->nh_func, nmh->nh_msg_type, nmh->nh_key); |
| 894 | rb_erase(&nmh->nh_node, &o2net_handler_tree); |
| 895 | list_del_init(&nmh->nh_unregister_item); |
| 896 | kref_put(&nmh->nh_kref, o2net_handler_kref_release); |
| 897 | } |
| 898 | write_unlock(&o2net_handler_lock); |
| 899 | } |
| 900 | EXPORT_SYMBOL_GPL(o2net_unregister_handler_list); |
| 901 | |
| 902 | static struct o2net_msg_handler *o2net_handler_get(u32 msg_type, u32 key) |
| 903 | { |
| 904 | struct o2net_msg_handler *nmh; |
| 905 | |
| 906 | read_lock(&o2net_handler_lock); |
| 907 | nmh = o2net_handler_tree_lookup(msg_type, key, NULL, NULL); |
| 908 | if (nmh) |
| 909 | kref_get(&nmh->nh_kref); |
| 910 | read_unlock(&o2net_handler_lock); |
| 911 | |
| 912 | return nmh; |
| 913 | } |
| 914 | |
| 915 | /* ------------------------------------------------------------ */ |
| 916 | |
| 917 | static int o2net_recv_tcp_msg(struct socket *sock, void *data, size_t len) |
| 918 | { |
| 919 | int ret; |
| 920 | mm_segment_t oldfs; |
| 921 | struct kvec vec = { |
| 922 | .iov_len = len, |
| 923 | .iov_base = data, |
| 924 | }; |
| 925 | struct msghdr msg = { |
| 926 | .msg_iovlen = 1, |
| 927 | .msg_iov = (struct iovec *)&vec, |
| 928 | .msg_flags = MSG_DONTWAIT, |
| 929 | }; |
| 930 | |
| 931 | oldfs = get_fs(); |
| 932 | set_fs(get_ds()); |
| 933 | ret = sock_recvmsg(sock, &msg, len, msg.msg_flags); |
| 934 | set_fs(oldfs); |
| 935 | |
| 936 | return ret; |
| 937 | } |
| 938 | |
| 939 | static int o2net_send_tcp_msg(struct socket *sock, struct kvec *vec, |
| 940 | size_t veclen, size_t total) |
| 941 | { |
| 942 | int ret; |
| 943 | mm_segment_t oldfs; |
| 944 | struct msghdr msg = { |
| 945 | .msg_iov = (struct iovec *)vec, |
| 946 | .msg_iovlen = veclen, |
| 947 | }; |
| 948 | |
| 949 | if (sock == NULL) { |
| 950 | ret = -EINVAL; |
| 951 | goto out; |
| 952 | } |
| 953 | |
| 954 | oldfs = get_fs(); |
| 955 | set_fs(get_ds()); |
| 956 | ret = sock_sendmsg(sock, &msg, total); |
| 957 | set_fs(oldfs); |
| 958 | if (ret != total) { |
| 959 | mlog(ML_ERROR, "sendmsg returned %d instead of %zu\n", ret, |
| 960 | total); |
| 961 | if (ret >= 0) |
| 962 | ret = -EPIPE; /* should be smarter, I bet */ |
| 963 | goto out; |
| 964 | } |
| 965 | |
| 966 | ret = 0; |
| 967 | out: |
| 968 | if (ret < 0) |
| 969 | mlog(0, "returning error: %d\n", ret); |
| 970 | return ret; |
| 971 | } |
| 972 | |
| 973 | static void o2net_sendpage(struct o2net_sock_container *sc, |
| 974 | void *kmalloced_virt, |
| 975 | size_t size) |
| 976 | { |
| 977 | struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num); |
| 978 | ssize_t ret; |
| 979 | |
Sunil Mushran | ce17204a | 2007-07-30 11:02:50 -0700 | [diff] [blame] | 980 | while (1) { |
| 981 | mutex_lock(&sc->sc_send_lock); |
| 982 | ret = sc->sc_sock->ops->sendpage(sc->sc_sock, |
| 983 | virt_to_page(kmalloced_virt), |
| 984 | (long)kmalloced_virt & ~PAGE_MASK, |
| 985 | size, MSG_DONTWAIT); |
| 986 | mutex_unlock(&sc->sc_send_lock); |
| 987 | if (ret == size) |
| 988 | break; |
| 989 | if (ret == (ssize_t)-EAGAIN) { |
| 990 | mlog(0, "sendpage of size %zu to " SC_NODEF_FMT |
| 991 | " returned EAGAIN\n", size, SC_NODEF_ARGS(sc)); |
| 992 | cond_resched(); |
| 993 | continue; |
| 994 | } |
Sunil Mushran | 2bd6321 | 2010-01-25 16:57:38 -0800 | [diff] [blame] | 995 | mlog(ML_ERROR, "sendpage of size %zu to " SC_NODEF_FMT |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 996 | " failed with %zd\n", size, SC_NODEF_ARGS(sc), ret); |
| 997 | o2net_ensure_shutdown(nn, sc, 0); |
Sunil Mushran | ce17204a | 2007-07-30 11:02:50 -0700 | [diff] [blame] | 998 | break; |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 999 | } |
| 1000 | } |
| 1001 | |
| 1002 | static void o2net_init_msg(struct o2net_msg *msg, u16 data_len, u16 msg_type, u32 key) |
| 1003 | { |
| 1004 | memset(msg, 0, sizeof(struct o2net_msg)); |
| 1005 | msg->magic = cpu_to_be16(O2NET_MSG_MAGIC); |
| 1006 | msg->data_len = cpu_to_be16(data_len); |
| 1007 | msg->msg_type = cpu_to_be16(msg_type); |
| 1008 | msg->sys_status = cpu_to_be32(O2NET_ERR_NONE); |
| 1009 | msg->status = 0; |
| 1010 | msg->key = cpu_to_be32(key); |
| 1011 | } |
| 1012 | |
| 1013 | static int o2net_tx_can_proceed(struct o2net_node *nn, |
| 1014 | struct o2net_sock_container **sc_ret, |
| 1015 | int *error) |
| 1016 | { |
| 1017 | int ret = 0; |
| 1018 | |
| 1019 | spin_lock(&nn->nn_lock); |
| 1020 | if (nn->nn_persistent_error) { |
| 1021 | ret = 1; |
| 1022 | *sc_ret = NULL; |
| 1023 | *error = nn->nn_persistent_error; |
| 1024 | } else if (nn->nn_sc_valid) { |
| 1025 | kref_get(&nn->nn_sc->sc_kref); |
| 1026 | |
| 1027 | ret = 1; |
| 1028 | *sc_ret = nn->nn_sc; |
| 1029 | *error = 0; |
| 1030 | } |
| 1031 | spin_unlock(&nn->nn_lock); |
| 1032 | |
| 1033 | return ret; |
| 1034 | } |
| 1035 | |
Sunil Mushran | 3ba169c | 2011-07-24 10:32:54 -0700 | [diff] [blame] | 1036 | /* Get a map of all nodes to which this node is currently connected to */ |
| 1037 | void o2net_fill_node_map(unsigned long *map, unsigned bytes) |
| 1038 | { |
| 1039 | struct o2net_sock_container *sc; |
| 1040 | int node, ret; |
| 1041 | |
| 1042 | BUG_ON(bytes < (BITS_TO_LONGS(O2NM_MAX_NODES) * sizeof(unsigned long))); |
| 1043 | |
| 1044 | memset(map, 0, bytes); |
| 1045 | for (node = 0; node < O2NM_MAX_NODES; ++node) { |
| 1046 | o2net_tx_can_proceed(o2net_nn_from_num(node), &sc, &ret); |
| 1047 | if (!ret) { |
| 1048 | set_bit(node, map); |
| 1049 | sc_put(sc); |
| 1050 | } |
| 1051 | } |
| 1052 | } |
| 1053 | EXPORT_SYMBOL_GPL(o2net_fill_node_map); |
| 1054 | |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1055 | int o2net_send_message_vec(u32 msg_type, u32 key, struct kvec *caller_vec, |
| 1056 | size_t caller_veclen, u8 target_node, int *status) |
| 1057 | { |
Wu Fengguang | 50aff04 | 2010-08-21 14:40:20 +0800 | [diff] [blame] | 1058 | int ret = 0; |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1059 | struct o2net_msg *msg = NULL; |
| 1060 | size_t veclen, caller_bytes = 0; |
| 1061 | struct kvec *vec = NULL; |
| 1062 | struct o2net_sock_container *sc = NULL; |
| 1063 | struct o2net_node *nn = o2net_nn_from_num(target_node); |
| 1064 | struct o2net_status_wait nsw = { |
| 1065 | .ns_node_item = LIST_HEAD_INIT(nsw.ns_node_item), |
| 1066 | }; |
Sunil Mushran | 2309e9e | 2008-04-14 10:46:19 -0700 | [diff] [blame] | 1067 | struct o2net_send_tracking nst; |
| 1068 | |
| 1069 | o2net_init_nst(&nst, msg_type, key, current, target_node); |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1070 | |
| 1071 | if (o2net_wq == NULL) { |
| 1072 | mlog(0, "attempt to tx without o2netd running\n"); |
| 1073 | ret = -ESRCH; |
| 1074 | goto out; |
| 1075 | } |
| 1076 | |
| 1077 | if (caller_veclen == 0) { |
| 1078 | mlog(0, "bad kvec array length\n"); |
| 1079 | ret = -EINVAL; |
| 1080 | goto out; |
| 1081 | } |
| 1082 | |
| 1083 | caller_bytes = iov_length((struct iovec *)caller_vec, caller_veclen); |
| 1084 | if (caller_bytes > O2NET_MAX_PAYLOAD_BYTES) { |
| 1085 | mlog(0, "total payload len %zu too large\n", caller_bytes); |
| 1086 | ret = -EINVAL; |
| 1087 | goto out; |
| 1088 | } |
| 1089 | |
| 1090 | if (target_node == o2nm_this_node()) { |
| 1091 | ret = -ELOOP; |
| 1092 | goto out; |
| 1093 | } |
| 1094 | |
Sunil Mushran | 2309e9e | 2008-04-14 10:46:19 -0700 | [diff] [blame] | 1095 | o2net_debug_add_nst(&nst); |
| 1096 | |
| 1097 | o2net_set_nst_sock_time(&nst); |
| 1098 | |
Sunil Mushran | 9af0b38 | 2009-06-11 11:02:03 -0700 | [diff] [blame] | 1099 | wait_event(nn->nn_sc_wq, o2net_tx_can_proceed(nn, &sc, &ret)); |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1100 | if (ret) |
| 1101 | goto out; |
| 1102 | |
Sunil Mushran | 2309e9e | 2008-04-14 10:46:19 -0700 | [diff] [blame] | 1103 | o2net_set_nst_sock_container(&nst, sc); |
| 1104 | |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1105 | veclen = caller_veclen + 1; |
| 1106 | vec = kmalloc(sizeof(struct kvec) * veclen, GFP_ATOMIC); |
| 1107 | if (vec == NULL) { |
| 1108 | mlog(0, "failed to %zu element kvec!\n", veclen); |
| 1109 | ret = -ENOMEM; |
| 1110 | goto out; |
| 1111 | } |
| 1112 | |
| 1113 | msg = kmalloc(sizeof(struct o2net_msg), GFP_ATOMIC); |
| 1114 | if (!msg) { |
| 1115 | mlog(0, "failed to allocate a o2net_msg!\n"); |
| 1116 | ret = -ENOMEM; |
| 1117 | goto out; |
| 1118 | } |
| 1119 | |
| 1120 | o2net_init_msg(msg, caller_bytes, msg_type, key); |
| 1121 | |
| 1122 | vec[0].iov_len = sizeof(struct o2net_msg); |
| 1123 | vec[0].iov_base = msg; |
| 1124 | memcpy(&vec[1], caller_vec, caller_veclen * sizeof(struct kvec)); |
| 1125 | |
| 1126 | ret = o2net_prep_nsw(nn, &nsw); |
| 1127 | if (ret) |
| 1128 | goto out; |
| 1129 | |
| 1130 | msg->msg_num = cpu_to_be32(nsw.ns_id); |
Sunil Mushran | 2309e9e | 2008-04-14 10:46:19 -0700 | [diff] [blame] | 1131 | o2net_set_nst_msg_id(&nst, nsw.ns_id); |
| 1132 | |
| 1133 | o2net_set_nst_send_time(&nst); |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1134 | |
| 1135 | /* finally, convert the message header to network byte-order |
| 1136 | * and send */ |
Zhen Wei | 925037b | 2007-01-23 17:19:59 -0800 | [diff] [blame] | 1137 | mutex_lock(&sc->sc_send_lock); |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1138 | ret = o2net_send_tcp_msg(sc->sc_sock, vec, veclen, |
| 1139 | sizeof(struct o2net_msg) + caller_bytes); |
Zhen Wei | 925037b | 2007-01-23 17:19:59 -0800 | [diff] [blame] | 1140 | mutex_unlock(&sc->sc_send_lock); |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1141 | msglog(msg, "sending returned %d\n", ret); |
| 1142 | if (ret < 0) { |
| 1143 | mlog(0, "error returned from o2net_send_tcp_msg=%d\n", ret); |
| 1144 | goto out; |
| 1145 | } |
| 1146 | |
| 1147 | /* wait on other node's handler */ |
Sunil Mushran | 2309e9e | 2008-04-14 10:46:19 -0700 | [diff] [blame] | 1148 | o2net_set_nst_status_time(&nst); |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1149 | wait_event(nsw.ns_wq, o2net_nsw_completed(nn, &nsw)); |
| 1150 | |
Sunil Mushran | 3c193b3 | 2010-12-22 12:39:40 -0800 | [diff] [blame] | 1151 | o2net_update_send_stats(&nst, sc); |
| 1152 | |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1153 | /* Note that we avoid overwriting the callers status return |
| 1154 | * variable if a system error was reported on the other |
| 1155 | * side. Callers beware. */ |
| 1156 | ret = o2net_sys_err_to_errno(nsw.ns_sys_status); |
| 1157 | if (status && !ret) |
| 1158 | *status = nsw.ns_status; |
| 1159 | |
| 1160 | mlog(0, "woken, returning system status %d, user status %d\n", |
| 1161 | ret, nsw.ns_status); |
| 1162 | out: |
Sunil Mushran | 2309e9e | 2008-04-14 10:46:19 -0700 | [diff] [blame] | 1163 | o2net_debug_del_nst(&nst); /* must be before dropping sc and node */ |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1164 | if (sc) |
| 1165 | sc_put(sc); |
Tim Gardner | d787ab0 | 2013-02-21 16:42:44 -0800 | [diff] [blame] | 1166 | kfree(vec); |
| 1167 | kfree(msg); |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1168 | o2net_complete_nsw(nn, &nsw, 0, 0, 0); |
| 1169 | return ret; |
| 1170 | } |
| 1171 | EXPORT_SYMBOL_GPL(o2net_send_message_vec); |
| 1172 | |
| 1173 | int o2net_send_message(u32 msg_type, u32 key, void *data, u32 len, |
| 1174 | u8 target_node, int *status) |
| 1175 | { |
| 1176 | struct kvec vec = { |
| 1177 | .iov_base = data, |
| 1178 | .iov_len = len, |
| 1179 | }; |
| 1180 | return o2net_send_message_vec(msg_type, key, &vec, 1, |
| 1181 | target_node, status); |
| 1182 | } |
| 1183 | EXPORT_SYMBOL_GPL(o2net_send_message); |
| 1184 | |
| 1185 | static int o2net_send_status_magic(struct socket *sock, struct o2net_msg *hdr, |
| 1186 | enum o2net_system_error syserr, int err) |
| 1187 | { |
| 1188 | struct kvec vec = { |
| 1189 | .iov_base = hdr, |
| 1190 | .iov_len = sizeof(struct o2net_msg), |
| 1191 | }; |
| 1192 | |
| 1193 | BUG_ON(syserr >= O2NET_ERR_MAX); |
| 1194 | |
| 1195 | /* leave other fields intact from the incoming message, msg_num |
| 1196 | * in particular */ |
| 1197 | hdr->sys_status = cpu_to_be32(syserr); |
| 1198 | hdr->status = cpu_to_be32(err); |
| 1199 | hdr->magic = cpu_to_be16(O2NET_MSG_STATUS_MAGIC); // twiddle the magic |
| 1200 | hdr->data_len = 0; |
| 1201 | |
| 1202 | msglog(hdr, "about to send status magic %d\n", err); |
| 1203 | /* hdr has been in host byteorder this whole time */ |
| 1204 | return o2net_send_tcp_msg(sock, &vec, 1, sizeof(struct o2net_msg)); |
| 1205 | } |
| 1206 | |
| 1207 | /* this returns -errno if the header was unknown or too large, etc. |
| 1208 | * after this is called the buffer us reused for the next message */ |
| 1209 | static int o2net_process_message(struct o2net_sock_container *sc, |
| 1210 | struct o2net_msg *hdr) |
| 1211 | { |
| 1212 | struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num); |
| 1213 | int ret = 0, handler_status; |
| 1214 | enum o2net_system_error syserr; |
| 1215 | struct o2net_msg_handler *nmh = NULL; |
Kurt Hackel | d74c980 | 2007-01-17 17:04:25 -0800 | [diff] [blame] | 1216 | void *ret_data = NULL; |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1217 | |
| 1218 | msglog(hdr, "processing message\n"); |
| 1219 | |
| 1220 | o2net_sc_postpone_idle(sc); |
| 1221 | |
| 1222 | switch(be16_to_cpu(hdr->magic)) { |
| 1223 | case O2NET_MSG_STATUS_MAGIC: |
| 1224 | /* special type for returning message status */ |
| 1225 | o2net_complete_nsw(nn, NULL, |
| 1226 | be32_to_cpu(hdr->msg_num), |
| 1227 | be32_to_cpu(hdr->sys_status), |
| 1228 | be32_to_cpu(hdr->status)); |
| 1229 | goto out; |
| 1230 | case O2NET_MSG_KEEP_REQ_MAGIC: |
| 1231 | o2net_sendpage(sc, o2net_keep_resp, |
| 1232 | sizeof(*o2net_keep_resp)); |
| 1233 | goto out; |
| 1234 | case O2NET_MSG_KEEP_RESP_MAGIC: |
| 1235 | goto out; |
| 1236 | case O2NET_MSG_MAGIC: |
| 1237 | break; |
| 1238 | default: |
| 1239 | msglog(hdr, "bad magic\n"); |
| 1240 | ret = -EINVAL; |
| 1241 | goto out; |
| 1242 | break; |
| 1243 | } |
| 1244 | |
| 1245 | /* find a handler for it */ |
| 1246 | handler_status = 0; |
| 1247 | nmh = o2net_handler_get(be16_to_cpu(hdr->msg_type), |
| 1248 | be32_to_cpu(hdr->key)); |
| 1249 | if (!nmh) { |
| 1250 | mlog(ML_TCP, "couldn't find handler for type %u key %08x\n", |
| 1251 | be16_to_cpu(hdr->msg_type), be32_to_cpu(hdr->key)); |
| 1252 | syserr = O2NET_ERR_NO_HNDLR; |
| 1253 | goto out_respond; |
| 1254 | } |
| 1255 | |
| 1256 | syserr = O2NET_ERR_NONE; |
| 1257 | |
| 1258 | if (be16_to_cpu(hdr->data_len) > nmh->nh_max_len) |
| 1259 | syserr = O2NET_ERR_OVERFLOW; |
| 1260 | |
| 1261 | if (syserr != O2NET_ERR_NONE) |
| 1262 | goto out_respond; |
| 1263 | |
Sunil Mushran | ff1becb | 2010-12-22 12:39:39 -0800 | [diff] [blame] | 1264 | o2net_set_func_start_time(sc); |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1265 | sc->sc_msg_key = be32_to_cpu(hdr->key); |
| 1266 | sc->sc_msg_type = be16_to_cpu(hdr->msg_type); |
| 1267 | handler_status = (nmh->nh_func)(hdr, sizeof(struct o2net_msg) + |
| 1268 | be16_to_cpu(hdr->data_len), |
Kurt Hackel | d74c980 | 2007-01-17 17:04:25 -0800 | [diff] [blame] | 1269 | nmh->nh_func_data, &ret_data); |
Sunil Mushran | ff1becb | 2010-12-22 12:39:39 -0800 | [diff] [blame] | 1270 | o2net_set_func_stop_time(sc); |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1271 | |
Sunil Mushran | e453039 | 2010-12-22 12:39:41 -0800 | [diff] [blame] | 1272 | o2net_update_recv_stats(sc); |
| 1273 | |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1274 | out_respond: |
| 1275 | /* this destroys the hdr, so don't use it after this */ |
Zhen Wei | 925037b | 2007-01-23 17:19:59 -0800 | [diff] [blame] | 1276 | mutex_lock(&sc->sc_send_lock); |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1277 | ret = o2net_send_status_magic(sc->sc_sock, hdr, syserr, |
| 1278 | handler_status); |
Zhen Wei | 925037b | 2007-01-23 17:19:59 -0800 | [diff] [blame] | 1279 | mutex_unlock(&sc->sc_send_lock); |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1280 | hdr = NULL; |
| 1281 | mlog(0, "sending handler status %d, syserr %d returned %d\n", |
| 1282 | handler_status, syserr, ret); |
| 1283 | |
Kurt Hackel | d74c980 | 2007-01-17 17:04:25 -0800 | [diff] [blame] | 1284 | if (nmh) { |
| 1285 | BUG_ON(ret_data != NULL && nmh->nh_post_func == NULL); |
| 1286 | if (nmh->nh_post_func) |
| 1287 | (nmh->nh_post_func)(handler_status, nmh->nh_func_data, |
| 1288 | ret_data); |
| 1289 | } |
| 1290 | |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1291 | out: |
| 1292 | if (nmh) |
| 1293 | o2net_handler_put(nmh); |
| 1294 | return ret; |
| 1295 | } |
| 1296 | |
| 1297 | static int o2net_check_handshake(struct o2net_sock_container *sc) |
| 1298 | { |
| 1299 | struct o2net_handshake *hand = page_address(sc->sc_page); |
| 1300 | struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num); |
| 1301 | |
| 1302 | if (hand->protocol_version != cpu_to_be64(O2NET_PROTOCOL_VERSION)) { |
Sunil Mushran | 1dfecf8 | 2011-07-24 10:22:54 -0700 | [diff] [blame] | 1303 | printk(KERN_NOTICE "o2net: " SC_NODEF_FMT " Advertised net " |
| 1304 | "protocol version %llu but %llu is required. " |
| 1305 | "Disconnecting.\n", SC_NODEF_ARGS(sc), |
| 1306 | (unsigned long long)be64_to_cpu(hand->protocol_version), |
| 1307 | O2NET_PROTOCOL_VERSION); |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1308 | |
| 1309 | /* don't bother reconnecting if its the wrong version. */ |
| 1310 | o2net_ensure_shutdown(nn, sc, -ENOTCONN); |
| 1311 | return -1; |
| 1312 | } |
| 1313 | |
Andrew Beekhof | 828ae6a | 2006-12-04 14:04:55 +0100 | [diff] [blame] | 1314 | /* |
| 1315 | * Ensure timeouts are consistent with other nodes, otherwise |
| 1316 | * we can end up with one node thinking that the other must be down, |
| 1317 | * but isn't. This can ultimately cause corruption. |
| 1318 | */ |
| 1319 | if (be32_to_cpu(hand->o2net_idle_timeout_ms) != |
Jeff Mahoney | 409753b | 2008-03-28 16:44:13 -0700 | [diff] [blame] | 1320 | o2net_idle_timeout()) { |
Sunil Mushran | 1dfecf8 | 2011-07-24 10:22:54 -0700 | [diff] [blame] | 1321 | printk(KERN_NOTICE "o2net: " SC_NODEF_FMT " uses a network " |
| 1322 | "idle timeout of %u ms, but we use %u ms locally. " |
| 1323 | "Disconnecting.\n", SC_NODEF_ARGS(sc), |
| 1324 | be32_to_cpu(hand->o2net_idle_timeout_ms), |
| 1325 | o2net_idle_timeout()); |
Andrew Beekhof | 828ae6a | 2006-12-04 14:04:55 +0100 | [diff] [blame] | 1326 | o2net_ensure_shutdown(nn, sc, -ENOTCONN); |
| 1327 | return -1; |
| 1328 | } |
| 1329 | |
| 1330 | if (be32_to_cpu(hand->o2net_keepalive_delay_ms) != |
Jeff Mahoney | 409753b | 2008-03-28 16:44:13 -0700 | [diff] [blame] | 1331 | o2net_keepalive_delay()) { |
Sunil Mushran | 1dfecf8 | 2011-07-24 10:22:54 -0700 | [diff] [blame] | 1332 | printk(KERN_NOTICE "o2net: " SC_NODEF_FMT " uses a keepalive " |
| 1333 | "delay of %u ms, but we use %u ms locally. " |
| 1334 | "Disconnecting.\n", SC_NODEF_ARGS(sc), |
| 1335 | be32_to_cpu(hand->o2net_keepalive_delay_ms), |
| 1336 | o2net_keepalive_delay()); |
Andrew Beekhof | 828ae6a | 2006-12-04 14:04:55 +0100 | [diff] [blame] | 1337 | o2net_ensure_shutdown(nn, sc, -ENOTCONN); |
| 1338 | return -1; |
| 1339 | } |
| 1340 | |
| 1341 | if (be32_to_cpu(hand->o2hb_heartbeat_timeout_ms) != |
| 1342 | O2HB_MAX_WRITE_TIMEOUT_MS) { |
Sunil Mushran | 1dfecf8 | 2011-07-24 10:22:54 -0700 | [diff] [blame] | 1343 | printk(KERN_NOTICE "o2net: " SC_NODEF_FMT " uses a heartbeat " |
| 1344 | "timeout of %u ms, but we use %u ms locally. " |
| 1345 | "Disconnecting.\n", SC_NODEF_ARGS(sc), |
| 1346 | be32_to_cpu(hand->o2hb_heartbeat_timeout_ms), |
| 1347 | O2HB_MAX_WRITE_TIMEOUT_MS); |
Andrew Beekhof | 828ae6a | 2006-12-04 14:04:55 +0100 | [diff] [blame] | 1348 | o2net_ensure_shutdown(nn, sc, -ENOTCONN); |
| 1349 | return -1; |
| 1350 | } |
| 1351 | |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1352 | sc->sc_handshake_ok = 1; |
| 1353 | |
| 1354 | spin_lock(&nn->nn_lock); |
| 1355 | /* set valid and queue the idle timers only if it hasn't been |
| 1356 | * shut down already */ |
| 1357 | if (nn->nn_sc == sc) { |
Jeff Mahoney | b5dd803 | 2006-12-04 14:04:54 +0100 | [diff] [blame] | 1358 | o2net_sc_reset_idle_timer(sc); |
Tao Ma | 5cc3bf2 | 2008-03-05 15:50:12 +0800 | [diff] [blame] | 1359 | atomic_set(&nn->nn_timeout, 0); |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1360 | o2net_set_nn_state(nn, sc, 1, 0); |
| 1361 | } |
| 1362 | spin_unlock(&nn->nn_lock); |
| 1363 | |
| 1364 | /* shift everything up as though it wasn't there */ |
| 1365 | sc->sc_page_off -= sizeof(struct o2net_handshake); |
| 1366 | if (sc->sc_page_off) |
| 1367 | memmove(hand, hand + 1, sc->sc_page_off); |
| 1368 | |
| 1369 | return 0; |
| 1370 | } |
| 1371 | |
| 1372 | /* this demuxes the queued rx bytes into header or payload bits and calls |
| 1373 | * handlers as each full message is read off the socket. it returns -error, |
| 1374 | * == 0 eof, or > 0 for progress made.*/ |
| 1375 | static int o2net_advance_rx(struct o2net_sock_container *sc) |
| 1376 | { |
| 1377 | struct o2net_msg *hdr; |
| 1378 | int ret = 0; |
| 1379 | void *data; |
| 1380 | size_t datalen; |
| 1381 | |
| 1382 | sclog(sc, "receiving\n"); |
Sunil Mushran | ff1becb | 2010-12-22 12:39:39 -0800 | [diff] [blame] | 1383 | o2net_set_advance_start_time(sc); |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1384 | |
Andrew Beekhof | 828ae6a | 2006-12-04 14:04:55 +0100 | [diff] [blame] | 1385 | if (unlikely(sc->sc_handshake_ok == 0)) { |
| 1386 | if(sc->sc_page_off < sizeof(struct o2net_handshake)) { |
| 1387 | data = page_address(sc->sc_page) + sc->sc_page_off; |
| 1388 | datalen = sizeof(struct o2net_handshake) - sc->sc_page_off; |
| 1389 | ret = o2net_recv_tcp_msg(sc->sc_sock, data, datalen); |
| 1390 | if (ret > 0) |
| 1391 | sc->sc_page_off += ret; |
| 1392 | } |
| 1393 | |
| 1394 | if (sc->sc_page_off == sizeof(struct o2net_handshake)) { |
| 1395 | o2net_check_handshake(sc); |
| 1396 | if (unlikely(sc->sc_handshake_ok == 0)) |
| 1397 | ret = -EPROTO; |
| 1398 | } |
| 1399 | goto out; |
| 1400 | } |
| 1401 | |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1402 | /* do we need more header? */ |
| 1403 | if (sc->sc_page_off < sizeof(struct o2net_msg)) { |
| 1404 | data = page_address(sc->sc_page) + sc->sc_page_off; |
| 1405 | datalen = sizeof(struct o2net_msg) - sc->sc_page_off; |
| 1406 | ret = o2net_recv_tcp_msg(sc->sc_sock, data, datalen); |
| 1407 | if (ret > 0) { |
| 1408 | sc->sc_page_off += ret; |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1409 | /* only swab incoming here.. we can |
| 1410 | * only get here once as we cross from |
| 1411 | * being under to over */ |
| 1412 | if (sc->sc_page_off == sizeof(struct o2net_msg)) { |
| 1413 | hdr = page_address(sc->sc_page); |
| 1414 | if (be16_to_cpu(hdr->data_len) > |
| 1415 | O2NET_MAX_PAYLOAD_BYTES) |
| 1416 | ret = -EOVERFLOW; |
| 1417 | } |
| 1418 | } |
| 1419 | if (ret <= 0) |
| 1420 | goto out; |
| 1421 | } |
| 1422 | |
| 1423 | if (sc->sc_page_off < sizeof(struct o2net_msg)) { |
| 1424 | /* oof, still don't have a header */ |
| 1425 | goto out; |
| 1426 | } |
| 1427 | |
| 1428 | /* this was swabbed above when we first read it */ |
| 1429 | hdr = page_address(sc->sc_page); |
| 1430 | |
| 1431 | msglog(hdr, "at page_off %zu\n", sc->sc_page_off); |
| 1432 | |
| 1433 | /* do we need more payload? */ |
| 1434 | if (sc->sc_page_off - sizeof(struct o2net_msg) < be16_to_cpu(hdr->data_len)) { |
| 1435 | /* need more payload */ |
| 1436 | data = page_address(sc->sc_page) + sc->sc_page_off; |
| 1437 | datalen = (sizeof(struct o2net_msg) + be16_to_cpu(hdr->data_len)) - |
| 1438 | sc->sc_page_off; |
| 1439 | ret = o2net_recv_tcp_msg(sc->sc_sock, data, datalen); |
| 1440 | if (ret > 0) |
| 1441 | sc->sc_page_off += ret; |
| 1442 | if (ret <= 0) |
| 1443 | goto out; |
| 1444 | } |
| 1445 | |
| 1446 | if (sc->sc_page_off - sizeof(struct o2net_msg) == be16_to_cpu(hdr->data_len)) { |
| 1447 | /* we can only get here once, the first time we read |
| 1448 | * the payload.. so set ret to progress if the handler |
| 1449 | * works out. after calling this the message is toast */ |
| 1450 | ret = o2net_process_message(sc, hdr); |
| 1451 | if (ret == 0) |
| 1452 | ret = 1; |
| 1453 | sc->sc_page_off = 0; |
| 1454 | } |
| 1455 | |
| 1456 | out: |
| 1457 | sclog(sc, "ret = %d\n", ret); |
Sunil Mushran | ff1becb | 2010-12-22 12:39:39 -0800 | [diff] [blame] | 1458 | o2net_set_advance_stop_time(sc); |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1459 | return ret; |
| 1460 | } |
| 1461 | |
| 1462 | /* this work func is triggerd by data ready. it reads until it can read no |
| 1463 | * more. it interprets 0, eof, as fatal. if data_ready hits while we're doing |
| 1464 | * our work the work struct will be marked and we'll be called again. */ |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 1465 | static void o2net_rx_until_empty(struct work_struct *work) |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1466 | { |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 1467 | struct o2net_sock_container *sc = |
| 1468 | container_of(work, struct o2net_sock_container, sc_rx_work); |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1469 | int ret; |
| 1470 | |
| 1471 | do { |
| 1472 | ret = o2net_advance_rx(sc); |
| 1473 | } while (ret > 0); |
| 1474 | |
| 1475 | if (ret <= 0 && ret != -EAGAIN) { |
| 1476 | struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num); |
| 1477 | sclog(sc, "saw error %d, closing\n", ret); |
| 1478 | /* not permanent so read failed handshake can retry */ |
| 1479 | o2net_ensure_shutdown(nn, sc, 0); |
| 1480 | } |
| 1481 | |
| 1482 | sc_put(sc); |
| 1483 | } |
| 1484 | |
| 1485 | static int o2net_set_nodelay(struct socket *sock) |
| 1486 | { |
| 1487 | int ret, val = 1; |
| 1488 | mm_segment_t oldfs; |
| 1489 | |
| 1490 | oldfs = get_fs(); |
| 1491 | set_fs(KERNEL_DS); |
| 1492 | |
| 1493 | /* |
| 1494 | * Dear unsuspecting programmer, |
| 1495 | * |
| 1496 | * Don't use sock_setsockopt() for SOL_TCP. It doesn't check its level |
| 1497 | * argument and assumes SOL_SOCKET so, say, your TCP_NODELAY will |
| 1498 | * silently turn into SO_DEBUG. |
| 1499 | * |
| 1500 | * Yours, |
| 1501 | * Keeper of hilariously fragile interfaces. |
| 1502 | */ |
| 1503 | ret = sock->ops->setsockopt(sock, SOL_TCP, TCP_NODELAY, |
| 1504 | (char __user *)&val, sizeof(val)); |
| 1505 | |
| 1506 | set_fs(oldfs); |
| 1507 | return ret; |
| 1508 | } |
| 1509 | |
Andrew Beekhof | 828ae6a | 2006-12-04 14:04:55 +0100 | [diff] [blame] | 1510 | static void o2net_initialize_handshake(void) |
| 1511 | { |
| 1512 | o2net_hand->o2hb_heartbeat_timeout_ms = cpu_to_be32( |
| 1513 | O2HB_MAX_WRITE_TIMEOUT_MS); |
Jeff Mahoney | 409753b | 2008-03-28 16:44:13 -0700 | [diff] [blame] | 1514 | o2net_hand->o2net_idle_timeout_ms = cpu_to_be32(o2net_idle_timeout()); |
Andrew Beekhof | 828ae6a | 2006-12-04 14:04:55 +0100 | [diff] [blame] | 1515 | o2net_hand->o2net_keepalive_delay_ms = cpu_to_be32( |
Jeff Mahoney | 409753b | 2008-03-28 16:44:13 -0700 | [diff] [blame] | 1516 | o2net_keepalive_delay()); |
Andrew Beekhof | 828ae6a | 2006-12-04 14:04:55 +0100 | [diff] [blame] | 1517 | o2net_hand->o2net_reconnect_delay_ms = cpu_to_be32( |
Jeff Mahoney | 409753b | 2008-03-28 16:44:13 -0700 | [diff] [blame] | 1518 | o2net_reconnect_delay()); |
Andrew Beekhof | 828ae6a | 2006-12-04 14:04:55 +0100 | [diff] [blame] | 1519 | } |
| 1520 | |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1521 | /* ------------------------------------------------------------ */ |
| 1522 | |
| 1523 | /* called when a connect completes and after a sock is accepted. the |
| 1524 | * rx path will see the response and mark the sc valid */ |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 1525 | static void o2net_sc_connect_completed(struct work_struct *work) |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1526 | { |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 1527 | struct o2net_sock_container *sc = |
| 1528 | container_of(work, struct o2net_sock_container, |
| 1529 | sc_connect_work); |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1530 | |
| 1531 | mlog(ML_MSG, "sc sending handshake with ver %llu id %llx\n", |
| 1532 | (unsigned long long)O2NET_PROTOCOL_VERSION, |
| 1533 | (unsigned long long)be64_to_cpu(o2net_hand->connector_id)); |
| 1534 | |
Andrew Beekhof | 828ae6a | 2006-12-04 14:04:55 +0100 | [diff] [blame] | 1535 | o2net_initialize_handshake(); |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1536 | o2net_sendpage(sc, o2net_hand, sizeof(*o2net_hand)); |
| 1537 | sc_put(sc); |
| 1538 | } |
| 1539 | |
| 1540 | /* this is called as a work_struct func. */ |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 1541 | static void o2net_sc_send_keep_req(struct work_struct *work) |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1542 | { |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 1543 | struct o2net_sock_container *sc = |
| 1544 | container_of(work, struct o2net_sock_container, |
| 1545 | sc_keepalive_work.work); |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1546 | |
| 1547 | o2net_sendpage(sc, o2net_keep_req, sizeof(*o2net_keep_req)); |
| 1548 | sc_put(sc); |
| 1549 | } |
| 1550 | |
| 1551 | /* socket shutdown does a del_timer_sync against this as it tears down. |
| 1552 | * we can't start this timer until we've got to the point in sc buildup |
| 1553 | * where shutdown is going to be involved */ |
| 1554 | static void o2net_idle_timer(unsigned long data) |
| 1555 | { |
| 1556 | struct o2net_sock_container *sc = (struct o2net_sock_container *)data; |
Tao Ma | 5cc3bf2 | 2008-03-05 15:50:12 +0800 | [diff] [blame] | 1557 | struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num); |
Sunil Mushran | ff1becb | 2010-12-22 12:39:39 -0800 | [diff] [blame] | 1558 | #ifdef CONFIG_DEBUG_FS |
Sunil Mushran | 1dfecf8 | 2011-07-24 10:22:54 -0700 | [diff] [blame] | 1559 | unsigned long msecs = ktime_to_ms(ktime_get()) - |
| 1560 | ktime_to_ms(sc->sc_tv_timer); |
| 1561 | #else |
| 1562 | unsigned long msecs = o2net_idle_timeout(); |
Sunil Mushran | ff1becb | 2010-12-22 12:39:39 -0800 | [diff] [blame] | 1563 | #endif |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1564 | |
Sunil Mushran | 1dfecf8 | 2011-07-24 10:22:54 -0700 | [diff] [blame] | 1565 | printk(KERN_NOTICE "o2net: Connection to " SC_NODEF_FMT " has been " |
| 1566 | "idle for %lu.%lu secs, shutting it down.\n", SC_NODEF_ARGS(sc), |
| 1567 | msecs / 1000, msecs % 1000); |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1568 | |
Tao Ma | 5cc3bf2 | 2008-03-05 15:50:12 +0800 | [diff] [blame] | 1569 | /* |
| 1570 | * Initialize the nn_timeout so that the next connection attempt |
| 1571 | * will continue in o2net_start_connect. |
| 1572 | */ |
| 1573 | atomic_set(&nn->nn_timeout, 1); |
| 1574 | |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1575 | o2net_sc_queue_work(sc, &sc->sc_shutdown_work); |
| 1576 | } |
| 1577 | |
Jeff Mahoney | b5dd803 | 2006-12-04 14:04:54 +0100 | [diff] [blame] | 1578 | static void o2net_sc_reset_idle_timer(struct o2net_sock_container *sc) |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1579 | { |
| 1580 | o2net_sc_cancel_delayed_work(sc, &sc->sc_keepalive_work); |
| 1581 | o2net_sc_queue_delayed_work(sc, &sc->sc_keepalive_work, |
Jeff Mahoney | 409753b | 2008-03-28 16:44:13 -0700 | [diff] [blame] | 1582 | msecs_to_jiffies(o2net_keepalive_delay())); |
Sunil Mushran | ff1becb | 2010-12-22 12:39:39 -0800 | [diff] [blame] | 1583 | o2net_set_sock_timer(sc); |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1584 | mod_timer(&sc->sc_idle_timeout, |
Jeff Mahoney | 409753b | 2008-03-28 16:44:13 -0700 | [diff] [blame] | 1585 | jiffies + msecs_to_jiffies(o2net_idle_timeout())); |
Jeff Mahoney | b5dd803 | 2006-12-04 14:04:54 +0100 | [diff] [blame] | 1586 | } |
| 1587 | |
| 1588 | static void o2net_sc_postpone_idle(struct o2net_sock_container *sc) |
| 1589 | { |
| 1590 | /* Only push out an existing timer */ |
| 1591 | if (timer_pending(&sc->sc_idle_timeout)) |
| 1592 | o2net_sc_reset_idle_timer(sc); |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1593 | } |
| 1594 | |
| 1595 | /* this work func is kicked whenever a path sets the nn state which doesn't |
| 1596 | * have valid set. This includes seeing hb come up, losing a connection, |
| 1597 | * having a connect attempt fail, etc. This centralizes the logic which decides |
| 1598 | * if a connect attempt should be made or if we should give up and all future |
| 1599 | * transmit attempts should fail */ |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 1600 | static void o2net_start_connect(struct work_struct *work) |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1601 | { |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 1602 | struct o2net_node *nn = |
| 1603 | container_of(work, struct o2net_node, nn_connect_work.work); |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1604 | struct o2net_sock_container *sc = NULL; |
Sunil Mushran | b7668c7 | 2006-02-28 23:28:01 -0800 | [diff] [blame] | 1605 | struct o2nm_node *node = NULL, *mynode = NULL; |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1606 | struct socket *sock = NULL; |
| 1607 | struct sockaddr_in myaddr = {0, }, remoteaddr = {0, }; |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 1608 | int ret = 0, stop; |
Tao Ma | 5cc3bf2 | 2008-03-05 15:50:12 +0800 | [diff] [blame] | 1609 | unsigned int timeout; |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1610 | |
| 1611 | /* if we're greater we initiate tx, otherwise we accept */ |
| 1612 | if (o2nm_this_node() <= o2net_num_from_nn(nn)) |
| 1613 | goto out; |
| 1614 | |
| 1615 | /* watch for racing with tearing a node down */ |
| 1616 | node = o2nm_get_node_by_num(o2net_num_from_nn(nn)); |
| 1617 | if (node == NULL) { |
| 1618 | ret = 0; |
| 1619 | goto out; |
| 1620 | } |
| 1621 | |
Sunil Mushran | b7668c7 | 2006-02-28 23:28:01 -0800 | [diff] [blame] | 1622 | mynode = o2nm_get_node_by_num(o2nm_this_node()); |
| 1623 | if (mynode == NULL) { |
| 1624 | ret = 0; |
| 1625 | goto out; |
| 1626 | } |
| 1627 | |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1628 | spin_lock(&nn->nn_lock); |
Tao Ma | 5cc3bf2 | 2008-03-05 15:50:12 +0800 | [diff] [blame] | 1629 | /* |
| 1630 | * see if we already have one pending or have given up. |
| 1631 | * For nn_timeout, it is set when we close the connection |
| 1632 | * because of the idle time out. So it means that we have |
| 1633 | * at least connected to that node successfully once, |
| 1634 | * now try to connect to it again. |
| 1635 | */ |
| 1636 | timeout = atomic_read(&nn->nn_timeout); |
| 1637 | stop = (nn->nn_sc || |
| 1638 | (nn->nn_persistent_error && |
| 1639 | (nn->nn_persistent_error != -ENOTCONN || timeout == 0))); |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1640 | spin_unlock(&nn->nn_lock); |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 1641 | if (stop) |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1642 | goto out; |
| 1643 | |
| 1644 | nn->nn_last_connect_attempt = jiffies; |
| 1645 | |
| 1646 | sc = sc_alloc(node); |
| 1647 | if (sc == NULL) { |
| 1648 | mlog(0, "couldn't allocate sc\n"); |
| 1649 | ret = -ENOMEM; |
| 1650 | goto out; |
| 1651 | } |
| 1652 | |
| 1653 | ret = sock_create(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock); |
| 1654 | if (ret < 0) { |
| 1655 | mlog(0, "can't create socket: %d\n", ret); |
| 1656 | goto out; |
| 1657 | } |
| 1658 | sc->sc_sock = sock; /* freed by sc_kref_release */ |
| 1659 | |
| 1660 | sock->sk->sk_allocation = GFP_ATOMIC; |
| 1661 | |
| 1662 | myaddr.sin_family = AF_INET; |
Mark Fasheh | 5fdf1e6 | 2007-04-27 16:50:03 -0700 | [diff] [blame] | 1663 | myaddr.sin_addr.s_addr = mynode->nd_ipv4_address; |
Al Viro | 97bd791 | 2007-12-05 08:46:47 +0000 | [diff] [blame] | 1664 | myaddr.sin_port = htons(0); /* any port */ |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1665 | |
| 1666 | ret = sock->ops->bind(sock, (struct sockaddr *)&myaddr, |
| 1667 | sizeof(myaddr)); |
| 1668 | if (ret) { |
Harvey Harrison | be85940 | 2008-10-31 00:56:28 -0700 | [diff] [blame] | 1669 | mlog(ML_ERROR, "bind failed with %d at address %pI4\n", |
| 1670 | ret, &mynode->nd_ipv4_address); |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1671 | goto out; |
| 1672 | } |
| 1673 | |
| 1674 | ret = o2net_set_nodelay(sc->sc_sock); |
| 1675 | if (ret) { |
| 1676 | mlog(ML_ERROR, "setting TCP_NODELAY failed with %d\n", ret); |
| 1677 | goto out; |
| 1678 | } |
| 1679 | |
| 1680 | o2net_register_callbacks(sc->sc_sock->sk, sc); |
| 1681 | |
| 1682 | spin_lock(&nn->nn_lock); |
| 1683 | /* handshake completion will set nn->nn_sc_valid */ |
| 1684 | o2net_set_nn_state(nn, sc, 0, 0); |
| 1685 | spin_unlock(&nn->nn_lock); |
| 1686 | |
| 1687 | remoteaddr.sin_family = AF_INET; |
Mark Fasheh | 5fdf1e6 | 2007-04-27 16:50:03 -0700 | [diff] [blame] | 1688 | remoteaddr.sin_addr.s_addr = node->nd_ipv4_address; |
| 1689 | remoteaddr.sin_port = node->nd_ipv4_port; |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1690 | |
| 1691 | ret = sc->sc_sock->ops->connect(sc->sc_sock, |
| 1692 | (struct sockaddr *)&remoteaddr, |
| 1693 | sizeof(remoteaddr), |
| 1694 | O_NONBLOCK); |
| 1695 | if (ret == -EINPROGRESS) |
| 1696 | ret = 0; |
| 1697 | |
| 1698 | out: |
Sunil Mushran | 8dd7903 | 2013-09-11 14:19:49 -0700 | [diff] [blame] | 1699 | if (ret && sc) { |
Sunil Mushran | 1dfecf8 | 2011-07-24 10:22:54 -0700 | [diff] [blame] | 1700 | printk(KERN_NOTICE "o2net: Connect attempt to " SC_NODEF_FMT |
| 1701 | " failed with errno %d\n", SC_NODEF_ARGS(sc), ret); |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1702 | /* 0 err so that another will be queued and attempted |
| 1703 | * from set_nn_state */ |
Sunil Mushran | 8dd7903 | 2013-09-11 14:19:49 -0700 | [diff] [blame] | 1704 | o2net_ensure_shutdown(nn, sc, 0); |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1705 | } |
| 1706 | if (sc) |
| 1707 | sc_put(sc); |
| 1708 | if (node) |
| 1709 | o2nm_node_put(node); |
Sunil Mushran | b7668c7 | 2006-02-28 23:28:01 -0800 | [diff] [blame] | 1710 | if (mynode) |
| 1711 | o2nm_node_put(mynode); |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1712 | |
| 1713 | return; |
| 1714 | } |
| 1715 | |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 1716 | static void o2net_connect_expired(struct work_struct *work) |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1717 | { |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 1718 | struct o2net_node *nn = |
| 1719 | container_of(work, struct o2net_node, nn_connect_expired.work); |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1720 | |
| 1721 | spin_lock(&nn->nn_lock); |
| 1722 | if (!nn->nn_sc_valid) { |
Sunil Mushran | 1dfecf8 | 2011-07-24 10:22:54 -0700 | [diff] [blame] | 1723 | printk(KERN_NOTICE "o2net: No connection established with " |
| 1724 | "node %u after %u.%u seconds, giving up.\n", |
Jeff Mahoney | b5dd803 | 2006-12-04 14:04:54 +0100 | [diff] [blame] | 1725 | o2net_num_from_nn(nn), |
Jeff Mahoney | 409753b | 2008-03-28 16:44:13 -0700 | [diff] [blame] | 1726 | o2net_idle_timeout() / 1000, |
| 1727 | o2net_idle_timeout() % 1000); |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1728 | |
| 1729 | o2net_set_nn_state(nn, NULL, 0, -ENOTCONN); |
| 1730 | } |
| 1731 | spin_unlock(&nn->nn_lock); |
| 1732 | } |
| 1733 | |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 1734 | static void o2net_still_up(struct work_struct *work) |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1735 | { |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 1736 | struct o2net_node *nn = |
| 1737 | container_of(work, struct o2net_node, nn_still_up.work); |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1738 | |
| 1739 | o2quo_hb_still_up(o2net_num_from_nn(nn)); |
| 1740 | } |
| 1741 | |
| 1742 | /* ------------------------------------------------------------ */ |
| 1743 | |
| 1744 | void o2net_disconnect_node(struct o2nm_node *node) |
| 1745 | { |
| 1746 | struct o2net_node *nn = o2net_nn_from_num(node->nd_num); |
| 1747 | |
| 1748 | /* don't reconnect until it's heartbeating again */ |
| 1749 | spin_lock(&nn->nn_lock); |
Tao Ma | 5cc3bf2 | 2008-03-05 15:50:12 +0800 | [diff] [blame] | 1750 | atomic_set(&nn->nn_timeout, 0); |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1751 | o2net_set_nn_state(nn, NULL, 0, -ENOTCONN); |
| 1752 | spin_unlock(&nn->nn_lock); |
| 1753 | |
| 1754 | if (o2net_wq) { |
| 1755 | cancel_delayed_work(&nn->nn_connect_expired); |
| 1756 | cancel_delayed_work(&nn->nn_connect_work); |
| 1757 | cancel_delayed_work(&nn->nn_still_up); |
| 1758 | flush_workqueue(o2net_wq); |
| 1759 | } |
| 1760 | } |
| 1761 | |
| 1762 | static void o2net_hb_node_down_cb(struct o2nm_node *node, int node_num, |
| 1763 | void *data) |
| 1764 | { |
| 1765 | o2quo_hb_down(node_num); |
| 1766 | |
Sunil Mushran | 0e105d3 | 2010-10-07 17:00:16 -0700 | [diff] [blame] | 1767 | if (!node) |
| 1768 | return; |
| 1769 | |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1770 | if (node_num != o2nm_this_node()) |
| 1771 | o2net_disconnect_node(node); |
Andrew Beekhof | 828ae6a | 2006-12-04 14:04:55 +0100 | [diff] [blame] | 1772 | |
| 1773 | BUG_ON(atomic_read(&o2net_connected_peers) < 0); |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1774 | } |
| 1775 | |
| 1776 | static void o2net_hb_node_up_cb(struct o2nm_node *node, int node_num, |
| 1777 | void *data) |
| 1778 | { |
| 1779 | struct o2net_node *nn = o2net_nn_from_num(node_num); |
| 1780 | |
| 1781 | o2quo_hb_up(node_num); |
| 1782 | |
Sunil Mushran | 0e105d3 | 2010-10-07 17:00:16 -0700 | [diff] [blame] | 1783 | BUG_ON(!node); |
| 1784 | |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1785 | /* ensure an immediate connect attempt */ |
| 1786 | nn->nn_last_connect_attempt = jiffies - |
Jeff Mahoney | 409753b | 2008-03-28 16:44:13 -0700 | [diff] [blame] | 1787 | (msecs_to_jiffies(o2net_reconnect_delay()) + 1); |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1788 | |
| 1789 | if (node_num != o2nm_this_node()) { |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1790 | /* believe it or not, accept and node hearbeating testing |
| 1791 | * can succeed for this node before we got here.. so |
| 1792 | * only use set_nn_state to clear the persistent error |
| 1793 | * if that hasn't already happened */ |
| 1794 | spin_lock(&nn->nn_lock); |
Tao Ma | 5cc3bf2 | 2008-03-05 15:50:12 +0800 | [diff] [blame] | 1795 | atomic_set(&nn->nn_timeout, 0); |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1796 | if (nn->nn_persistent_error) |
| 1797 | o2net_set_nn_state(nn, NULL, 0, 0); |
| 1798 | spin_unlock(&nn->nn_lock); |
| 1799 | } |
| 1800 | } |
| 1801 | |
| 1802 | void o2net_unregister_hb_callbacks(void) |
| 1803 | { |
Joel Becker | 1482942 | 2007-06-14 21:40:49 -0700 | [diff] [blame] | 1804 | o2hb_unregister_callback(NULL, &o2net_hb_up); |
| 1805 | o2hb_unregister_callback(NULL, &o2net_hb_down); |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1806 | } |
| 1807 | |
| 1808 | int o2net_register_hb_callbacks(void) |
| 1809 | { |
| 1810 | int ret; |
| 1811 | |
| 1812 | o2hb_setup_callback(&o2net_hb_down, O2HB_NODE_DOWN_CB, |
| 1813 | o2net_hb_node_down_cb, NULL, O2NET_HB_PRI); |
| 1814 | o2hb_setup_callback(&o2net_hb_up, O2HB_NODE_UP_CB, |
| 1815 | o2net_hb_node_up_cb, NULL, O2NET_HB_PRI); |
| 1816 | |
Joel Becker | 1482942 | 2007-06-14 21:40:49 -0700 | [diff] [blame] | 1817 | ret = o2hb_register_callback(NULL, &o2net_hb_up); |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1818 | if (ret == 0) |
Joel Becker | 1482942 | 2007-06-14 21:40:49 -0700 | [diff] [blame] | 1819 | ret = o2hb_register_callback(NULL, &o2net_hb_down); |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1820 | |
| 1821 | if (ret) |
| 1822 | o2net_unregister_hb_callbacks(); |
| 1823 | |
| 1824 | return ret; |
| 1825 | } |
| 1826 | |
| 1827 | /* ------------------------------------------------------------ */ |
| 1828 | |
| 1829 | static int o2net_accept_one(struct socket *sock) |
| 1830 | { |
| 1831 | int ret, slen; |
| 1832 | struct sockaddr_in sin; |
| 1833 | struct socket *new_sock = NULL; |
| 1834 | struct o2nm_node *node = NULL; |
Tristan Ye | 415cf32 | 2010-08-02 10:00:26 +0800 | [diff] [blame] | 1835 | struct o2nm_node *local_node = NULL; |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1836 | struct o2net_sock_container *sc = NULL; |
| 1837 | struct o2net_node *nn; |
| 1838 | |
| 1839 | BUG_ON(sock == NULL); |
| 1840 | ret = sock_create_lite(sock->sk->sk_family, sock->sk->sk_type, |
| 1841 | sock->sk->sk_protocol, &new_sock); |
| 1842 | if (ret) |
| 1843 | goto out; |
| 1844 | |
| 1845 | new_sock->type = sock->type; |
| 1846 | new_sock->ops = sock->ops; |
| 1847 | ret = sock->ops->accept(sock, new_sock, O_NONBLOCK); |
| 1848 | if (ret < 0) |
| 1849 | goto out; |
| 1850 | |
| 1851 | new_sock->sk->sk_allocation = GFP_ATOMIC; |
| 1852 | |
| 1853 | ret = o2net_set_nodelay(new_sock); |
| 1854 | if (ret) { |
| 1855 | mlog(ML_ERROR, "setting TCP_NODELAY failed with %d\n", ret); |
| 1856 | goto out; |
| 1857 | } |
| 1858 | |
| 1859 | slen = sizeof(sin); |
| 1860 | ret = new_sock->ops->getname(new_sock, (struct sockaddr *) &sin, |
| 1861 | &slen, 1); |
| 1862 | if (ret < 0) |
| 1863 | goto out; |
| 1864 | |
Al Viro | 97bd791 | 2007-12-05 08:46:47 +0000 | [diff] [blame] | 1865 | node = o2nm_get_node_by_ip(sin.sin_addr.s_addr); |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1866 | if (node == NULL) { |
Sunil Mushran | 1dfecf8 | 2011-07-24 10:22:54 -0700 | [diff] [blame] | 1867 | printk(KERN_NOTICE "o2net: Attempt to connect from unknown " |
| 1868 | "node at %pI4:%d\n", &sin.sin_addr.s_addr, |
| 1869 | ntohs(sin.sin_port)); |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1870 | ret = -EINVAL; |
| 1871 | goto out; |
| 1872 | } |
| 1873 | |
Tristan Ye | 415cf32 | 2010-08-02 10:00:26 +0800 | [diff] [blame] | 1874 | if (o2nm_this_node() >= node->nd_num) { |
| 1875 | local_node = o2nm_get_node_by_num(o2nm_this_node()); |
Joseph Qi | 03dbe88 | 2013-09-11 14:20:01 -0700 | [diff] [blame] | 1876 | if (local_node) |
| 1877 | printk(KERN_NOTICE "o2net: Unexpected connect attempt " |
| 1878 | "seen at node '%s' (%u, %pI4:%d) from " |
| 1879 | "node '%s' (%u, %pI4:%d)\n", |
| 1880 | local_node->nd_name, local_node->nd_num, |
| 1881 | &(local_node->nd_ipv4_address), |
| 1882 | ntohs(local_node->nd_ipv4_port), |
| 1883 | node->nd_name, |
| 1884 | node->nd_num, &sin.sin_addr.s_addr, |
| 1885 | ntohs(sin.sin_port)); |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1886 | ret = -EINVAL; |
| 1887 | goto out; |
| 1888 | } |
| 1889 | |
| 1890 | /* this happens all the time when the other node sees our heartbeat |
| 1891 | * and tries to connect before we see their heartbeat */ |
| 1892 | if (!o2hb_check_node_heartbeating_from_callback(node->nd_num)) { |
| 1893 | mlog(ML_CONN, "attempt to connect from node '%s' at " |
Harvey Harrison | be85940 | 2008-10-31 00:56:28 -0700 | [diff] [blame] | 1894 | "%pI4:%d but it isn't heartbeating\n", |
| 1895 | node->nd_name, &sin.sin_addr.s_addr, |
Al Viro | 97bd791 | 2007-12-05 08:46:47 +0000 | [diff] [blame] | 1896 | ntohs(sin.sin_port)); |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1897 | ret = -EINVAL; |
| 1898 | goto out; |
| 1899 | } |
| 1900 | |
| 1901 | nn = o2net_nn_from_num(node->nd_num); |
| 1902 | |
| 1903 | spin_lock(&nn->nn_lock); |
| 1904 | if (nn->nn_sc) |
| 1905 | ret = -EBUSY; |
| 1906 | else |
| 1907 | ret = 0; |
| 1908 | spin_unlock(&nn->nn_lock); |
| 1909 | if (ret) { |
Sunil Mushran | 1dfecf8 | 2011-07-24 10:22:54 -0700 | [diff] [blame] | 1910 | printk(KERN_NOTICE "o2net: Attempt to connect from node '%s' " |
| 1911 | "at %pI4:%d but it already has an open connection\n", |
| 1912 | node->nd_name, &sin.sin_addr.s_addr, |
| 1913 | ntohs(sin.sin_port)); |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1914 | goto out; |
| 1915 | } |
| 1916 | |
| 1917 | sc = sc_alloc(node); |
| 1918 | if (sc == NULL) { |
| 1919 | ret = -ENOMEM; |
| 1920 | goto out; |
| 1921 | } |
| 1922 | |
| 1923 | sc->sc_sock = new_sock; |
| 1924 | new_sock = NULL; |
| 1925 | |
| 1926 | spin_lock(&nn->nn_lock); |
Tao Ma | 5cc3bf2 | 2008-03-05 15:50:12 +0800 | [diff] [blame] | 1927 | atomic_set(&nn->nn_timeout, 0); |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1928 | o2net_set_nn_state(nn, sc, 0, 0); |
| 1929 | spin_unlock(&nn->nn_lock); |
| 1930 | |
| 1931 | o2net_register_callbacks(sc->sc_sock->sk, sc); |
| 1932 | o2net_sc_queue_work(sc, &sc->sc_rx_work); |
| 1933 | |
Andrew Beekhof | 828ae6a | 2006-12-04 14:04:55 +0100 | [diff] [blame] | 1934 | o2net_initialize_handshake(); |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1935 | o2net_sendpage(sc, o2net_hand, sizeof(*o2net_hand)); |
| 1936 | |
| 1937 | out: |
| 1938 | if (new_sock) |
| 1939 | sock_release(new_sock); |
| 1940 | if (node) |
| 1941 | o2nm_node_put(node); |
Tristan Ye | 415cf32 | 2010-08-02 10:00:26 +0800 | [diff] [blame] | 1942 | if (local_node) |
| 1943 | o2nm_node_put(local_node); |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1944 | if (sc) |
| 1945 | sc_put(sc); |
| 1946 | return ret; |
| 1947 | } |
| 1948 | |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 1949 | static void o2net_accept_many(struct work_struct *work) |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1950 | { |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 1951 | struct socket *sock = o2net_listen_sock; |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1952 | while (o2net_accept_one(sock) == 0) |
| 1953 | cond_resched(); |
| 1954 | } |
| 1955 | |
| 1956 | static void o2net_listen_data_ready(struct sock *sk, int bytes) |
| 1957 | { |
| 1958 | void (*ready)(struct sock *sk, int bytes); |
| 1959 | |
| 1960 | read_lock(&sk->sk_callback_lock); |
| 1961 | ready = sk->sk_user_data; |
| 1962 | if (ready == NULL) { /* check for teardown race */ |
| 1963 | ready = sk->sk_data_ready; |
| 1964 | goto out; |
| 1965 | } |
| 1966 | |
| 1967 | /* ->sk_data_ready is also called for a newly established child socket |
| 1968 | * before it has been accepted and the acceptor has set up their |
| 1969 | * data_ready.. we only want to queue listen work for our listening |
| 1970 | * socket */ |
| 1971 | if (sk->sk_state == TCP_LISTEN) { |
| 1972 | mlog(ML_TCP, "bytes: %d\n", bytes); |
| 1973 | queue_work(o2net_wq, &o2net_listen_work); |
| 1974 | } |
| 1975 | |
| 1976 | out: |
| 1977 | read_unlock(&sk->sk_callback_lock); |
| 1978 | ready(sk, bytes); |
| 1979 | } |
| 1980 | |
Sunil Mushran | ab81afd | 2007-01-29 14:57:14 -0800 | [diff] [blame] | 1981 | static int o2net_open_listening_sock(__be32 addr, __be16 port) |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1982 | { |
| 1983 | struct socket *sock = NULL; |
| 1984 | int ret; |
| 1985 | struct sockaddr_in sin = { |
| 1986 | .sin_family = PF_INET, |
Mark Fasheh | 5fdf1e6 | 2007-04-27 16:50:03 -0700 | [diff] [blame] | 1987 | .sin_addr = { .s_addr = addr }, |
| 1988 | .sin_port = port, |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1989 | }; |
| 1990 | |
| 1991 | ret = sock_create(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock); |
| 1992 | if (ret < 0) { |
Sunil Mushran | 1dfecf8 | 2011-07-24 10:22:54 -0700 | [diff] [blame] | 1993 | printk(KERN_ERR "o2net: Error %d while creating socket\n", ret); |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 1994 | goto out; |
| 1995 | } |
| 1996 | |
| 1997 | sock->sk->sk_allocation = GFP_ATOMIC; |
| 1998 | |
| 1999 | write_lock_bh(&sock->sk->sk_callback_lock); |
| 2000 | sock->sk->sk_user_data = sock->sk->sk_data_ready; |
| 2001 | sock->sk->sk_data_ready = o2net_listen_data_ready; |
| 2002 | write_unlock_bh(&sock->sk->sk_callback_lock); |
| 2003 | |
| 2004 | o2net_listen_sock = sock; |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 2005 | INIT_WORK(&o2net_listen_work, o2net_accept_many); |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 2006 | |
Pavel Emelyanov | 4a17fd5 | 2012-04-19 03:39:36 +0000 | [diff] [blame] | 2007 | sock->sk->sk_reuse = SK_CAN_REUSE; |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 2008 | ret = sock->ops->bind(sock, (struct sockaddr *)&sin, sizeof(sin)); |
| 2009 | if (ret < 0) { |
Sunil Mushran | 1dfecf8 | 2011-07-24 10:22:54 -0700 | [diff] [blame] | 2010 | printk(KERN_ERR "o2net: Error %d while binding socket at " |
| 2011 | "%pI4:%u\n", ret, &addr, ntohs(port)); |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 2012 | goto out; |
| 2013 | } |
| 2014 | |
| 2015 | ret = sock->ops->listen(sock, 64); |
Sunil Mushran | 1dfecf8 | 2011-07-24 10:22:54 -0700 | [diff] [blame] | 2016 | if (ret < 0) |
| 2017 | printk(KERN_ERR "o2net: Error %d while listening on %pI4:%u\n", |
| 2018 | ret, &addr, ntohs(port)); |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 2019 | |
| 2020 | out: |
| 2021 | if (ret) { |
| 2022 | o2net_listen_sock = NULL; |
| 2023 | if (sock) |
| 2024 | sock_release(sock); |
| 2025 | } |
| 2026 | return ret; |
| 2027 | } |
| 2028 | |
| 2029 | /* |
| 2030 | * called from node manager when we should bring up our network listening |
| 2031 | * socket. node manager handles all the serialization to only call this |
| 2032 | * once and to match it with o2net_stop_listening(). note, |
| 2033 | * o2nm_this_node() doesn't work yet as we're being called while it |
| 2034 | * is being set up. |
| 2035 | */ |
| 2036 | int o2net_start_listening(struct o2nm_node *node) |
| 2037 | { |
| 2038 | int ret = 0; |
| 2039 | |
| 2040 | BUG_ON(o2net_wq != NULL); |
| 2041 | BUG_ON(o2net_listen_sock != NULL); |
| 2042 | |
| 2043 | mlog(ML_KTHREAD, "starting o2net thread...\n"); |
| 2044 | o2net_wq = create_singlethread_workqueue("o2net"); |
| 2045 | if (o2net_wq == NULL) { |
| 2046 | mlog(ML_ERROR, "unable to launch o2net thread\n"); |
| 2047 | return -ENOMEM; /* ? */ |
| 2048 | } |
| 2049 | |
Sunil Mushran | ab81afd | 2007-01-29 14:57:14 -0800 | [diff] [blame] | 2050 | ret = o2net_open_listening_sock(node->nd_ipv4_address, |
| 2051 | node->nd_ipv4_port); |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 2052 | if (ret) { |
| 2053 | destroy_workqueue(o2net_wq); |
| 2054 | o2net_wq = NULL; |
| 2055 | } else |
| 2056 | o2quo_conn_up(node->nd_num); |
| 2057 | |
| 2058 | return ret; |
| 2059 | } |
| 2060 | |
| 2061 | /* again, o2nm_this_node() doesn't work here as we're involved in |
| 2062 | * tearing it down */ |
| 2063 | void o2net_stop_listening(struct o2nm_node *node) |
| 2064 | { |
| 2065 | struct socket *sock = o2net_listen_sock; |
| 2066 | size_t i; |
| 2067 | |
| 2068 | BUG_ON(o2net_wq == NULL); |
| 2069 | BUG_ON(o2net_listen_sock == NULL); |
| 2070 | |
| 2071 | /* stop the listening socket from generating work */ |
| 2072 | write_lock_bh(&sock->sk->sk_callback_lock); |
| 2073 | sock->sk->sk_data_ready = sock->sk->sk_user_data; |
| 2074 | sock->sk->sk_user_data = NULL; |
| 2075 | write_unlock_bh(&sock->sk->sk_callback_lock); |
| 2076 | |
| 2077 | for (i = 0; i < ARRAY_SIZE(o2net_nodes); i++) { |
| 2078 | struct o2nm_node *node = o2nm_get_node_by_num(i); |
| 2079 | if (node) { |
| 2080 | o2net_disconnect_node(node); |
| 2081 | o2nm_node_put(node); |
| 2082 | } |
| 2083 | } |
| 2084 | |
| 2085 | /* finish all work and tear down the work queue */ |
| 2086 | mlog(ML_KTHREAD, "waiting for o2net thread to exit....\n"); |
| 2087 | destroy_workqueue(o2net_wq); |
| 2088 | o2net_wq = NULL; |
| 2089 | |
| 2090 | sock_release(o2net_listen_sock); |
| 2091 | o2net_listen_sock = NULL; |
| 2092 | |
| 2093 | o2quo_conn_err(node->nd_num); |
| 2094 | } |
| 2095 | |
| 2096 | /* ------------------------------------------------------------ */ |
| 2097 | |
| 2098 | int o2net_init(void) |
| 2099 | { |
| 2100 | unsigned long i; |
| 2101 | |
| 2102 | o2quo_init(); |
| 2103 | |
Sunil Mushran | 2309e9e | 2008-04-14 10:46:19 -0700 | [diff] [blame] | 2104 | if (o2net_debugfs_init()) |
| 2105 | return -ENOMEM; |
| 2106 | |
Robert P. J. Day | cd86128 | 2006-12-13 00:34:52 -0800 | [diff] [blame] | 2107 | o2net_hand = kzalloc(sizeof(struct o2net_handshake), GFP_KERNEL); |
| 2108 | o2net_keep_req = kzalloc(sizeof(struct o2net_msg), GFP_KERNEL); |
| 2109 | o2net_keep_resp = kzalloc(sizeof(struct o2net_msg), GFP_KERNEL); |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 2110 | if (!o2net_hand || !o2net_keep_req || !o2net_keep_resp) { |
| 2111 | kfree(o2net_hand); |
| 2112 | kfree(o2net_keep_req); |
| 2113 | kfree(o2net_keep_resp); |
| 2114 | return -ENOMEM; |
| 2115 | } |
| 2116 | |
| 2117 | o2net_hand->protocol_version = cpu_to_be64(O2NET_PROTOCOL_VERSION); |
| 2118 | o2net_hand->connector_id = cpu_to_be64(1); |
| 2119 | |
| 2120 | o2net_keep_req->magic = cpu_to_be16(O2NET_MSG_KEEP_REQ_MAGIC); |
| 2121 | o2net_keep_resp->magic = cpu_to_be16(O2NET_MSG_KEEP_RESP_MAGIC); |
| 2122 | |
| 2123 | for (i = 0; i < ARRAY_SIZE(o2net_nodes); i++) { |
| 2124 | struct o2net_node *nn = o2net_nn_from_num(i); |
| 2125 | |
Tao Ma | 5cc3bf2 | 2008-03-05 15:50:12 +0800 | [diff] [blame] | 2126 | atomic_set(&nn->nn_timeout, 0); |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 2127 | spin_lock_init(&nn->nn_lock); |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 2128 | INIT_DELAYED_WORK(&nn->nn_connect_work, o2net_start_connect); |
| 2129 | INIT_DELAYED_WORK(&nn->nn_connect_expired, |
| 2130 | o2net_connect_expired); |
| 2131 | INIT_DELAYED_WORK(&nn->nn_still_up, o2net_still_up); |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 2132 | /* until we see hb from a node we'll return einval */ |
| 2133 | nn->nn_persistent_error = -ENOTCONN; |
| 2134 | init_waitqueue_head(&nn->nn_sc_wq); |
| 2135 | idr_init(&nn->nn_status_idr); |
| 2136 | INIT_LIST_HEAD(&nn->nn_status_list); |
| 2137 | } |
| 2138 | |
| 2139 | return 0; |
| 2140 | } |
| 2141 | |
| 2142 | void o2net_exit(void) |
| 2143 | { |
| 2144 | o2quo_exit(); |
| 2145 | kfree(o2net_hand); |
| 2146 | kfree(o2net_keep_req); |
| 2147 | kfree(o2net_keep_resp); |
Sunil Mushran | 2309e9e | 2008-04-14 10:46:19 -0700 | [diff] [blame] | 2148 | o2net_debugfs_exit(); |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 2149 | } |