16ed7257bSPatrick Caulfield /****************************************************************************** 26ed7257bSPatrick Caulfield ******************************************************************************* 36ed7257bSPatrick Caulfield ** 46ed7257bSPatrick Caulfield ** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. 55e9ccc37SChristine Caulfield ** Copyright (C) 2004-2009 Red Hat, Inc. All rights reserved. 66ed7257bSPatrick Caulfield ** 76ed7257bSPatrick Caulfield ** This copyrighted material is made available to anyone wishing to use, 86ed7257bSPatrick Caulfield ** modify, copy, or redistribute it subject to the terms and conditions 96ed7257bSPatrick Caulfield ** of the GNU General Public License v.2. 106ed7257bSPatrick Caulfield ** 116ed7257bSPatrick Caulfield ******************************************************************************* 126ed7257bSPatrick Caulfield ******************************************************************************/ 136ed7257bSPatrick Caulfield 146ed7257bSPatrick Caulfield /* 156ed7257bSPatrick Caulfield * lowcomms.c 166ed7257bSPatrick Caulfield * 176ed7257bSPatrick Caulfield * This is the "low-level" comms layer. 186ed7257bSPatrick Caulfield * 196ed7257bSPatrick Caulfield * It is responsible for sending/receiving messages 206ed7257bSPatrick Caulfield * from other nodes in the cluster. 216ed7257bSPatrick Caulfield * 226ed7257bSPatrick Caulfield * Cluster nodes are referred to by their nodeids. nodeids are 236ed7257bSPatrick Caulfield * simply 32 bit numbers to the locking module - if they need to 242cf12c0bSJoe Perches * be expanded for the cluster infrastructure then that is its 256ed7257bSPatrick Caulfield * responsibility. It is this layer's 266ed7257bSPatrick Caulfield * responsibility to resolve these into IP address or 276ed7257bSPatrick Caulfield * whatever it needs for inter-node communication. 286ed7257bSPatrick Caulfield * 296ed7257bSPatrick Caulfield * The comms level is two kernel threads that deal mainly with 306ed7257bSPatrick Caulfield * the receiving of messages from other nodes and passing them 316ed7257bSPatrick Caulfield * up to the mid-level comms layer (which understands the 326ed7257bSPatrick Caulfield * message format) for execution by the locking core, and 336ed7257bSPatrick Caulfield * a send thread which does all the setting up of connections 346ed7257bSPatrick Caulfield * to remote nodes and the sending of data. Threads are not allowed 356ed7257bSPatrick Caulfield * to send their own data because it may cause them to wait in times 366ed7257bSPatrick Caulfield * of high load. Also, this way, the sending thread can collect together 376ed7257bSPatrick Caulfield * messages bound for one node and send them in one block. 386ed7257bSPatrick Caulfield * 392cf12c0bSJoe Perches * lowcomms will choose to use either TCP or SCTP as its transport layer 406ed7257bSPatrick Caulfield * depending on the configuration variable 'protocol'. This should be set 416ed7257bSPatrick Caulfield * to 0 (default) for TCP or 1 for SCTP. It should be configured using a 426ed7257bSPatrick Caulfield * cluster-wide mechanism as it must be the same on all nodes of the cluster 436ed7257bSPatrick Caulfield * for the DLM to function. 446ed7257bSPatrick Caulfield * 456ed7257bSPatrick Caulfield */ 466ed7257bSPatrick Caulfield 476ed7257bSPatrick Caulfield #include <asm/ioctls.h> 486ed7257bSPatrick Caulfield #include <net/sock.h> 496ed7257bSPatrick Caulfield #include <net/tcp.h> 506ed7257bSPatrick Caulfield #include <linux/pagemap.h> 516ed7257bSPatrick Caulfield #include <linux/file.h> 527a936ce7SMatthias Kaehlcke #include <linux/mutex.h> 536ed7257bSPatrick Caulfield #include <linux/sctp.h> 545a0e3ad6STejun Heo #include <linux/slab.h> 556ed7257bSPatrick Caulfield #include <net/sctp/user.h> 5644ad532bSJoe Perches #include <net/ipv6.h> 576ed7257bSPatrick Caulfield 586ed7257bSPatrick Caulfield #include "dlm_internal.h" 596ed7257bSPatrick Caulfield #include "lowcomms.h" 606ed7257bSPatrick Caulfield #include "midcomms.h" 616ed7257bSPatrick Caulfield #include "config.h" 626ed7257bSPatrick Caulfield 636ed7257bSPatrick Caulfield #define NEEDED_RMEM (4*1024*1024) 645e9ccc37SChristine Caulfield #define CONN_HASH_SIZE 32 656ed7257bSPatrick Caulfield 66f92c8dd7SBob Peterson /* Number of messages to send before rescheduling */ 67f92c8dd7SBob Peterson #define MAX_SEND_MSG_COUNT 25 68f92c8dd7SBob Peterson 696ed7257bSPatrick Caulfield struct cbuf { 706ed7257bSPatrick Caulfield unsigned int base; 716ed7257bSPatrick Caulfield unsigned int len; 726ed7257bSPatrick Caulfield unsigned int mask; 736ed7257bSPatrick Caulfield }; 746ed7257bSPatrick Caulfield 756ed7257bSPatrick Caulfield static void cbuf_add(struct cbuf *cb, int n) 766ed7257bSPatrick Caulfield { 776ed7257bSPatrick Caulfield cb->len += n; 786ed7257bSPatrick Caulfield } 796ed7257bSPatrick Caulfield 806ed7257bSPatrick Caulfield static int cbuf_data(struct cbuf *cb) 816ed7257bSPatrick Caulfield { 826ed7257bSPatrick Caulfield return ((cb->base + cb->len) & cb->mask); 836ed7257bSPatrick Caulfield } 846ed7257bSPatrick Caulfield 856ed7257bSPatrick Caulfield static void cbuf_init(struct cbuf *cb, int size) 866ed7257bSPatrick Caulfield { 876ed7257bSPatrick Caulfield cb->base = cb->len = 0; 886ed7257bSPatrick Caulfield cb->mask = size-1; 896ed7257bSPatrick Caulfield } 906ed7257bSPatrick Caulfield 916ed7257bSPatrick Caulfield static void cbuf_eat(struct cbuf *cb, int n) 926ed7257bSPatrick Caulfield { 936ed7257bSPatrick Caulfield cb->len -= n; 946ed7257bSPatrick Caulfield cb->base += n; 956ed7257bSPatrick Caulfield cb->base &= cb->mask; 966ed7257bSPatrick Caulfield } 976ed7257bSPatrick Caulfield 986ed7257bSPatrick Caulfield static bool cbuf_empty(struct cbuf *cb) 996ed7257bSPatrick Caulfield { 1006ed7257bSPatrick Caulfield return cb->len == 0; 1016ed7257bSPatrick Caulfield } 1026ed7257bSPatrick Caulfield 1036ed7257bSPatrick Caulfield struct connection { 1046ed7257bSPatrick Caulfield struct socket *sock; /* NULL if not connected */ 1056ed7257bSPatrick Caulfield uint32_t nodeid; /* So we know who we are in the list */ 1066ed7257bSPatrick Caulfield struct mutex sock_mutex; 1076ed7257bSPatrick Caulfield unsigned long flags; 1086ed7257bSPatrick Caulfield #define CF_READ_PENDING 1 1096ed7257bSPatrick Caulfield #define CF_WRITE_PENDING 2 1106ed7257bSPatrick Caulfield #define CF_CONNECT_PENDING 3 1116ed7257bSPatrick Caulfield #define CF_INIT_PENDING 4 1126ed7257bSPatrick Caulfield #define CF_IS_OTHERCON 5 113063c4c99SLars Marowsky-Bree #define CF_CLOSE 6 114b36930ddSDavid Miller #define CF_APP_LIMITED 7 1156ed7257bSPatrick Caulfield struct list_head writequeue; /* List of outgoing writequeue_entries */ 1166ed7257bSPatrick Caulfield spinlock_t writequeue_lock; 1176ed7257bSPatrick Caulfield int (*rx_action) (struct connection *); /* What to do when active */ 1186ed7257bSPatrick Caulfield void (*connect_action) (struct connection *); /* What to do to connect */ 1196ed7257bSPatrick Caulfield struct page *rx_page; 1206ed7257bSPatrick Caulfield struct cbuf cb; 1216ed7257bSPatrick Caulfield int retries; 1226ed7257bSPatrick Caulfield #define MAX_CONNECT_RETRIES 3 1236ed7257bSPatrick Caulfield int sctp_assoc; 1245e9ccc37SChristine Caulfield struct hlist_node list; 1256ed7257bSPatrick Caulfield struct connection *othercon; 1266ed7257bSPatrick Caulfield struct work_struct rwork; /* Receive workqueue */ 1276ed7257bSPatrick Caulfield struct work_struct swork; /* Send workqueue */ 1286ed7257bSPatrick Caulfield }; 1296ed7257bSPatrick Caulfield #define sock2con(x) ((struct connection *)(x)->sk_user_data) 1306ed7257bSPatrick Caulfield 1316ed7257bSPatrick Caulfield /* An entry waiting to be sent */ 1326ed7257bSPatrick Caulfield struct writequeue_entry { 1336ed7257bSPatrick Caulfield struct list_head list; 1346ed7257bSPatrick Caulfield struct page *page; 1356ed7257bSPatrick Caulfield int offset; 1366ed7257bSPatrick Caulfield int len; 1376ed7257bSPatrick Caulfield int end; 1386ed7257bSPatrick Caulfield int users; 1396ed7257bSPatrick Caulfield struct connection *con; 1406ed7257bSPatrick Caulfield }; 1416ed7257bSPatrick Caulfield 1426ed7257bSPatrick Caulfield static struct sockaddr_storage *dlm_local_addr[DLM_MAX_ADDR_COUNT]; 1436ed7257bSPatrick Caulfield static int dlm_local_count; 1446ed7257bSPatrick Caulfield 1456ed7257bSPatrick Caulfield /* Work queues */ 1466ed7257bSPatrick Caulfield static struct workqueue_struct *recv_workqueue; 1476ed7257bSPatrick Caulfield static struct workqueue_struct *send_workqueue; 1486ed7257bSPatrick Caulfield 1495e9ccc37SChristine Caulfield static struct hlist_head connection_hash[CONN_HASH_SIZE]; 1507a936ce7SMatthias Kaehlcke static DEFINE_MUTEX(connections_lock); 1516ed7257bSPatrick Caulfield static struct kmem_cache *con_cache; 1526ed7257bSPatrick Caulfield 1536ed7257bSPatrick Caulfield static void process_recv_sockets(struct work_struct *work); 1546ed7257bSPatrick Caulfield static void process_send_sockets(struct work_struct *work); 1556ed7257bSPatrick Caulfield 1565e9ccc37SChristine Caulfield 1575e9ccc37SChristine Caulfield /* This is deliberately very simple because most clusters have simple 1585e9ccc37SChristine Caulfield sequential nodeids, so we should be able to go straight to a connection 1595e9ccc37SChristine Caulfield struct in the array */ 1605e9ccc37SChristine Caulfield static inline int nodeid_hash(int nodeid) 1615e9ccc37SChristine Caulfield { 1625e9ccc37SChristine Caulfield return nodeid & (CONN_HASH_SIZE-1); 1635e9ccc37SChristine Caulfield } 1645e9ccc37SChristine Caulfield 1655e9ccc37SChristine Caulfield static struct connection *__find_con(int nodeid) 1665e9ccc37SChristine Caulfield { 1675e9ccc37SChristine Caulfield int r; 1685e9ccc37SChristine Caulfield struct hlist_node *h; 1695e9ccc37SChristine Caulfield struct connection *con; 1705e9ccc37SChristine Caulfield 1715e9ccc37SChristine Caulfield r = nodeid_hash(nodeid); 1725e9ccc37SChristine Caulfield 1735e9ccc37SChristine Caulfield hlist_for_each_entry(con, h, &connection_hash[r], list) { 1745e9ccc37SChristine Caulfield if (con->nodeid == nodeid) 1755e9ccc37SChristine Caulfield return con; 1765e9ccc37SChristine Caulfield } 1775e9ccc37SChristine Caulfield return NULL; 1785e9ccc37SChristine Caulfield } 1795e9ccc37SChristine Caulfield 1806ed7257bSPatrick Caulfield /* 1816ed7257bSPatrick Caulfield * If 'allocation' is zero then we don't attempt to create a new 1826ed7257bSPatrick Caulfield * connection structure for this node. 1836ed7257bSPatrick Caulfield */ 1846ed7257bSPatrick Caulfield static struct connection *__nodeid2con(int nodeid, gfp_t alloc) 1856ed7257bSPatrick Caulfield { 1866ed7257bSPatrick Caulfield struct connection *con = NULL; 1876ed7257bSPatrick Caulfield int r; 1886ed7257bSPatrick Caulfield 1895e9ccc37SChristine Caulfield con = __find_con(nodeid); 1906ed7257bSPatrick Caulfield if (con || !alloc) 1916ed7257bSPatrick Caulfield return con; 1926ed7257bSPatrick Caulfield 1936ed7257bSPatrick Caulfield con = kmem_cache_zalloc(con_cache, alloc); 1946ed7257bSPatrick Caulfield if (!con) 1956ed7257bSPatrick Caulfield return NULL; 1966ed7257bSPatrick Caulfield 1975e9ccc37SChristine Caulfield r = nodeid_hash(nodeid); 1985e9ccc37SChristine Caulfield hlist_add_head(&con->list, &connection_hash[r]); 1996ed7257bSPatrick Caulfield 2006ed7257bSPatrick Caulfield con->nodeid = nodeid; 2016ed7257bSPatrick Caulfield mutex_init(&con->sock_mutex); 2026ed7257bSPatrick Caulfield INIT_LIST_HEAD(&con->writequeue); 2036ed7257bSPatrick Caulfield spin_lock_init(&con->writequeue_lock); 2046ed7257bSPatrick Caulfield INIT_WORK(&con->swork, process_send_sockets); 2056ed7257bSPatrick Caulfield INIT_WORK(&con->rwork, process_recv_sockets); 2066ed7257bSPatrick Caulfield 2076ed7257bSPatrick Caulfield /* Setup action pointers for child sockets */ 2086ed7257bSPatrick Caulfield if (con->nodeid) { 2095e9ccc37SChristine Caulfield struct connection *zerocon = __find_con(0); 2106ed7257bSPatrick Caulfield 2116ed7257bSPatrick Caulfield con->connect_action = zerocon->connect_action; 2126ed7257bSPatrick Caulfield if (!con->rx_action) 2136ed7257bSPatrick Caulfield con->rx_action = zerocon->rx_action; 2146ed7257bSPatrick Caulfield } 2156ed7257bSPatrick Caulfield 2166ed7257bSPatrick Caulfield return con; 2176ed7257bSPatrick Caulfield } 2186ed7257bSPatrick Caulfield 2195e9ccc37SChristine Caulfield /* Loop round all connections */ 2205e9ccc37SChristine Caulfield static void foreach_conn(void (*conn_func)(struct connection *c)) 2215e9ccc37SChristine Caulfield { 2225e9ccc37SChristine Caulfield int i; 2235e9ccc37SChristine Caulfield struct hlist_node *h, *n; 2245e9ccc37SChristine Caulfield struct connection *con; 2255e9ccc37SChristine Caulfield 2265e9ccc37SChristine Caulfield for (i = 0; i < CONN_HASH_SIZE; i++) { 2275e9ccc37SChristine Caulfield hlist_for_each_entry_safe(con, h, n, &connection_hash[i], list){ 2285e9ccc37SChristine Caulfield conn_func(con); 2295e9ccc37SChristine Caulfield } 2305e9ccc37SChristine Caulfield } 2315e9ccc37SChristine Caulfield } 2325e9ccc37SChristine Caulfield 2336ed7257bSPatrick Caulfield static struct connection *nodeid2con(int nodeid, gfp_t allocation) 2346ed7257bSPatrick Caulfield { 2356ed7257bSPatrick Caulfield struct connection *con; 2366ed7257bSPatrick Caulfield 2377a936ce7SMatthias Kaehlcke mutex_lock(&connections_lock); 2386ed7257bSPatrick Caulfield con = __nodeid2con(nodeid, allocation); 2397a936ce7SMatthias Kaehlcke mutex_unlock(&connections_lock); 2406ed7257bSPatrick Caulfield 2416ed7257bSPatrick Caulfield return con; 2426ed7257bSPatrick Caulfield } 2436ed7257bSPatrick Caulfield 2446ed7257bSPatrick Caulfield /* This is a bit drastic, but only called when things go wrong */ 2456ed7257bSPatrick Caulfield static struct connection *assoc2con(int assoc_id) 2466ed7257bSPatrick Caulfield { 2476ed7257bSPatrick Caulfield int i; 2485e9ccc37SChristine Caulfield struct hlist_node *h; 2496ed7257bSPatrick Caulfield struct connection *con; 2506ed7257bSPatrick Caulfield 2517a936ce7SMatthias Kaehlcke mutex_lock(&connections_lock); 2525e9ccc37SChristine Caulfield 2535e9ccc37SChristine Caulfield for (i = 0 ; i < CONN_HASH_SIZE; i++) { 2545e9ccc37SChristine Caulfield hlist_for_each_entry(con, h, &connection_hash[i], list) { 255f70cb33bSJulia Lawall if (con->sctp_assoc == assoc_id) { 2567a936ce7SMatthias Kaehlcke mutex_unlock(&connections_lock); 2576ed7257bSPatrick Caulfield return con; 2586ed7257bSPatrick Caulfield } 2596ed7257bSPatrick Caulfield } 2605e9ccc37SChristine Caulfield } 2617a936ce7SMatthias Kaehlcke mutex_unlock(&connections_lock); 2626ed7257bSPatrick Caulfield return NULL; 2636ed7257bSPatrick Caulfield } 2646ed7257bSPatrick Caulfield 2656ed7257bSPatrick Caulfield static int nodeid_to_addr(int nodeid, struct sockaddr *retaddr) 2666ed7257bSPatrick Caulfield { 2676ed7257bSPatrick Caulfield struct sockaddr_storage addr; 2686ed7257bSPatrick Caulfield int error; 2696ed7257bSPatrick Caulfield 2706ed7257bSPatrick Caulfield if (!dlm_local_count) 2716ed7257bSPatrick Caulfield return -1; 2726ed7257bSPatrick Caulfield 2736ed7257bSPatrick Caulfield error = dlm_nodeid_to_addr(nodeid, &addr); 2746ed7257bSPatrick Caulfield if (error) 2756ed7257bSPatrick Caulfield return error; 2766ed7257bSPatrick Caulfield 2776ed7257bSPatrick Caulfield if (dlm_local_addr[0]->ss_family == AF_INET) { 2786ed7257bSPatrick Caulfield struct sockaddr_in *in4 = (struct sockaddr_in *) &addr; 2796ed7257bSPatrick Caulfield struct sockaddr_in *ret4 = (struct sockaddr_in *) retaddr; 2806ed7257bSPatrick Caulfield ret4->sin_addr.s_addr = in4->sin_addr.s_addr; 2816ed7257bSPatrick Caulfield } else { 2826ed7257bSPatrick Caulfield struct sockaddr_in6 *in6 = (struct sockaddr_in6 *) &addr; 2836ed7257bSPatrick Caulfield struct sockaddr_in6 *ret6 = (struct sockaddr_in6 *) retaddr; 28444ad532bSJoe Perches ipv6_addr_copy(&ret6->sin6_addr, &in6->sin6_addr); 2856ed7257bSPatrick Caulfield } 2866ed7257bSPatrick Caulfield 2876ed7257bSPatrick Caulfield return 0; 2886ed7257bSPatrick Caulfield } 2896ed7257bSPatrick Caulfield 2906ed7257bSPatrick Caulfield /* Data available on socket or listen socket received a connect */ 2916ed7257bSPatrick Caulfield static void lowcomms_data_ready(struct sock *sk, int count_unused) 2926ed7257bSPatrick Caulfield { 2936ed7257bSPatrick Caulfield struct connection *con = sock2con(sk); 294afb853fbSPatrick Caulfield if (con && !test_and_set_bit(CF_READ_PENDING, &con->flags)) 2956ed7257bSPatrick Caulfield queue_work(recv_workqueue, &con->rwork); 2966ed7257bSPatrick Caulfield } 2976ed7257bSPatrick Caulfield 2986ed7257bSPatrick Caulfield static void lowcomms_write_space(struct sock *sk) 2996ed7257bSPatrick Caulfield { 3006ed7257bSPatrick Caulfield struct connection *con = sock2con(sk); 3016ed7257bSPatrick Caulfield 302b36930ddSDavid Miller if (!con) 303b36930ddSDavid Miller return; 304b36930ddSDavid Miller 305b36930ddSDavid Miller clear_bit(SOCK_NOSPACE, &con->sock->flags); 306b36930ddSDavid Miller 307b36930ddSDavid Miller if (test_and_clear_bit(CF_APP_LIMITED, &con->flags)) { 308b36930ddSDavid Miller con->sock->sk->sk_write_pending--; 309b36930ddSDavid Miller clear_bit(SOCK_ASYNC_NOSPACE, &con->sock->flags); 310b36930ddSDavid Miller } 311b36930ddSDavid Miller 312b36930ddSDavid Miller if (!test_and_set_bit(CF_WRITE_PENDING, &con->flags)) 3136ed7257bSPatrick Caulfield queue_work(send_workqueue, &con->swork); 3146ed7257bSPatrick Caulfield } 3156ed7257bSPatrick Caulfield 3166ed7257bSPatrick Caulfield static inline void lowcomms_connect_sock(struct connection *con) 3176ed7257bSPatrick Caulfield { 318063c4c99SLars Marowsky-Bree if (test_bit(CF_CLOSE, &con->flags)) 319063c4c99SLars Marowsky-Bree return; 3206ed7257bSPatrick Caulfield if (!test_and_set_bit(CF_CONNECT_PENDING, &con->flags)) 3216ed7257bSPatrick Caulfield queue_work(send_workqueue, &con->swork); 3226ed7257bSPatrick Caulfield } 3236ed7257bSPatrick Caulfield 3246ed7257bSPatrick Caulfield static void lowcomms_state_change(struct sock *sk) 3256ed7257bSPatrick Caulfield { 3266ed7257bSPatrick Caulfield if (sk->sk_state == TCP_ESTABLISHED) 3276ed7257bSPatrick Caulfield lowcomms_write_space(sk); 3286ed7257bSPatrick Caulfield } 3296ed7257bSPatrick Caulfield 330391fbdc5SChristine Caulfield int dlm_lowcomms_connect_node(int nodeid) 331391fbdc5SChristine Caulfield { 332391fbdc5SChristine Caulfield struct connection *con; 333391fbdc5SChristine Caulfield 33404bedd79SDavid Teigland /* with sctp there's no connecting without sending */ 33504bedd79SDavid Teigland if (dlm_config.ci_protocol != 0) 33604bedd79SDavid Teigland return 0; 33704bedd79SDavid Teigland 338391fbdc5SChristine Caulfield if (nodeid == dlm_our_nodeid()) 339391fbdc5SChristine Caulfield return 0; 340391fbdc5SChristine Caulfield 341391fbdc5SChristine Caulfield con = nodeid2con(nodeid, GFP_NOFS); 342391fbdc5SChristine Caulfield if (!con) 343391fbdc5SChristine Caulfield return -ENOMEM; 344391fbdc5SChristine Caulfield lowcomms_connect_sock(con); 345391fbdc5SChristine Caulfield return 0; 346391fbdc5SChristine Caulfield } 347391fbdc5SChristine Caulfield 3486ed7257bSPatrick Caulfield /* Make a socket active */ 3496ed7257bSPatrick Caulfield static int add_sock(struct socket *sock, struct connection *con) 3506ed7257bSPatrick Caulfield { 3516ed7257bSPatrick Caulfield con->sock = sock; 3526ed7257bSPatrick Caulfield 3536ed7257bSPatrick Caulfield /* Install a data_ready callback */ 3546ed7257bSPatrick Caulfield con->sock->sk->sk_data_ready = lowcomms_data_ready; 3556ed7257bSPatrick Caulfield con->sock->sk->sk_write_space = lowcomms_write_space; 3566ed7257bSPatrick Caulfield con->sock->sk->sk_state_change = lowcomms_state_change; 3576ed7257bSPatrick Caulfield con->sock->sk->sk_user_data = con; 358d6d7b702SSteven Whitehouse con->sock->sk->sk_allocation = GFP_NOFS; 3596ed7257bSPatrick Caulfield return 0; 3606ed7257bSPatrick Caulfield } 3616ed7257bSPatrick Caulfield 3626ed7257bSPatrick Caulfield /* Add the port number to an IPv6 or 4 sockaddr and return the address 3636ed7257bSPatrick Caulfield length */ 3646ed7257bSPatrick Caulfield static void make_sockaddr(struct sockaddr_storage *saddr, uint16_t port, 3656ed7257bSPatrick Caulfield int *addr_len) 3666ed7257bSPatrick Caulfield { 3676ed7257bSPatrick Caulfield saddr->ss_family = dlm_local_addr[0]->ss_family; 3686ed7257bSPatrick Caulfield if (saddr->ss_family == AF_INET) { 3696ed7257bSPatrick Caulfield struct sockaddr_in *in4_addr = (struct sockaddr_in *)saddr; 3706ed7257bSPatrick Caulfield in4_addr->sin_port = cpu_to_be16(port); 3716ed7257bSPatrick Caulfield *addr_len = sizeof(struct sockaddr_in); 3726ed7257bSPatrick Caulfield memset(&in4_addr->sin_zero, 0, sizeof(in4_addr->sin_zero)); 3736ed7257bSPatrick Caulfield } else { 3746ed7257bSPatrick Caulfield struct sockaddr_in6 *in6_addr = (struct sockaddr_in6 *)saddr; 3756ed7257bSPatrick Caulfield in6_addr->sin6_port = cpu_to_be16(port); 3766ed7257bSPatrick Caulfield *addr_len = sizeof(struct sockaddr_in6); 3776ed7257bSPatrick Caulfield } 37801c8cab2SPatrick Caulfield memset((char *)saddr + *addr_len, 0, sizeof(struct sockaddr_storage) - *addr_len); 3796ed7257bSPatrick Caulfield } 3806ed7257bSPatrick Caulfield 3816ed7257bSPatrick Caulfield /* Close a remote connection and tidy up */ 3826ed7257bSPatrick Caulfield static void close_connection(struct connection *con, bool and_other) 3836ed7257bSPatrick Caulfield { 3846ed7257bSPatrick Caulfield mutex_lock(&con->sock_mutex); 3856ed7257bSPatrick Caulfield 3866ed7257bSPatrick Caulfield if (con->sock) { 3876ed7257bSPatrick Caulfield sock_release(con->sock); 3886ed7257bSPatrick Caulfield con->sock = NULL; 3896ed7257bSPatrick Caulfield } 3906ed7257bSPatrick Caulfield if (con->othercon && and_other) { 3916ed7257bSPatrick Caulfield /* Will only re-enter once. */ 3926ed7257bSPatrick Caulfield close_connection(con->othercon, false); 3936ed7257bSPatrick Caulfield } 3946ed7257bSPatrick Caulfield if (con->rx_page) { 3956ed7257bSPatrick Caulfield __free_page(con->rx_page); 3966ed7257bSPatrick Caulfield con->rx_page = NULL; 3976ed7257bSPatrick Caulfield } 3989e5f2825SPatrick Caulfield 3996ed7257bSPatrick Caulfield con->retries = 0; 4006ed7257bSPatrick Caulfield mutex_unlock(&con->sock_mutex); 4016ed7257bSPatrick Caulfield } 4026ed7257bSPatrick Caulfield 4036ed7257bSPatrick Caulfield /* We only send shutdown messages to nodes that are not part of the cluster */ 4046ed7257bSPatrick Caulfield static void sctp_send_shutdown(sctp_assoc_t associd) 4056ed7257bSPatrick Caulfield { 4066ed7257bSPatrick Caulfield static char outcmsg[CMSG_SPACE(sizeof(struct sctp_sndrcvinfo))]; 4076ed7257bSPatrick Caulfield struct msghdr outmessage; 4086ed7257bSPatrick Caulfield struct cmsghdr *cmsg; 4096ed7257bSPatrick Caulfield struct sctp_sndrcvinfo *sinfo; 4106ed7257bSPatrick Caulfield int ret; 4116ed7257bSPatrick Caulfield struct connection *con; 4126ed7257bSPatrick Caulfield 4136ed7257bSPatrick Caulfield con = nodeid2con(0,0); 4146ed7257bSPatrick Caulfield BUG_ON(con == NULL); 4156ed7257bSPatrick Caulfield 4166ed7257bSPatrick Caulfield outmessage.msg_name = NULL; 4176ed7257bSPatrick Caulfield outmessage.msg_namelen = 0; 4186ed7257bSPatrick Caulfield outmessage.msg_control = outcmsg; 4196ed7257bSPatrick Caulfield outmessage.msg_controllen = sizeof(outcmsg); 4206ed7257bSPatrick Caulfield outmessage.msg_flags = MSG_EOR; 4216ed7257bSPatrick Caulfield 4226ed7257bSPatrick Caulfield cmsg = CMSG_FIRSTHDR(&outmessage); 4236ed7257bSPatrick Caulfield cmsg->cmsg_level = IPPROTO_SCTP; 4246ed7257bSPatrick Caulfield cmsg->cmsg_type = SCTP_SNDRCV; 4256ed7257bSPatrick Caulfield cmsg->cmsg_len = CMSG_LEN(sizeof(struct sctp_sndrcvinfo)); 4266ed7257bSPatrick Caulfield outmessage.msg_controllen = cmsg->cmsg_len; 4276ed7257bSPatrick Caulfield sinfo = CMSG_DATA(cmsg); 4286ed7257bSPatrick Caulfield memset(sinfo, 0x00, sizeof(struct sctp_sndrcvinfo)); 4296ed7257bSPatrick Caulfield 4306ed7257bSPatrick Caulfield sinfo->sinfo_flags |= MSG_EOF; 4316ed7257bSPatrick Caulfield sinfo->sinfo_assoc_id = associd; 4326ed7257bSPatrick Caulfield 4336ed7257bSPatrick Caulfield ret = kernel_sendmsg(con->sock, &outmessage, NULL, 0, 0); 4346ed7257bSPatrick Caulfield 4356ed7257bSPatrick Caulfield if (ret != 0) 4366ed7257bSPatrick Caulfield log_print("send EOF to node failed: %d", ret); 4376ed7257bSPatrick Caulfield } 4386ed7257bSPatrick Caulfield 4395e9ccc37SChristine Caulfield static void sctp_init_failed_foreach(struct connection *con) 4405e9ccc37SChristine Caulfield { 4415e9ccc37SChristine Caulfield con->sctp_assoc = 0; 4425e9ccc37SChristine Caulfield if (test_and_clear_bit(CF_CONNECT_PENDING, &con->flags)) { 4435e9ccc37SChristine Caulfield if (!test_and_set_bit(CF_WRITE_PENDING, &con->flags)) 4445e9ccc37SChristine Caulfield queue_work(send_workqueue, &con->swork); 4455e9ccc37SChristine Caulfield } 4465e9ccc37SChristine Caulfield } 4475e9ccc37SChristine Caulfield 4486ed7257bSPatrick Caulfield /* INIT failed but we don't know which node... 4496ed7257bSPatrick Caulfield restart INIT on all pending nodes */ 4506ed7257bSPatrick Caulfield static void sctp_init_failed(void) 4516ed7257bSPatrick Caulfield { 4527a936ce7SMatthias Kaehlcke mutex_lock(&connections_lock); 4535e9ccc37SChristine Caulfield 4545e9ccc37SChristine Caulfield foreach_conn(sctp_init_failed_foreach); 4555e9ccc37SChristine Caulfield 4567a936ce7SMatthias Kaehlcke mutex_unlock(&connections_lock); 4576ed7257bSPatrick Caulfield } 4586ed7257bSPatrick Caulfield 4596ed7257bSPatrick Caulfield /* Something happened to an association */ 460617e82e1SDavid Teigland static void process_sctp_notification(struct connection *con, 461617e82e1SDavid Teigland struct msghdr *msg, char *buf) 4626ed7257bSPatrick Caulfield { 4636ed7257bSPatrick Caulfield union sctp_notification *sn = (union sctp_notification *)buf; 4646ed7257bSPatrick Caulfield 4656ed7257bSPatrick Caulfield if (sn->sn_header.sn_type == SCTP_ASSOC_CHANGE) { 4666ed7257bSPatrick Caulfield switch (sn->sn_assoc_change.sac_state) { 4676ed7257bSPatrick Caulfield 4686ed7257bSPatrick Caulfield case SCTP_COMM_UP: 4696ed7257bSPatrick Caulfield case SCTP_RESTART: 4706ed7257bSPatrick Caulfield { 4716ed7257bSPatrick Caulfield /* Check that the new node is in the lockspace */ 4726ed7257bSPatrick Caulfield struct sctp_prim prim; 4736ed7257bSPatrick Caulfield int nodeid; 4746ed7257bSPatrick Caulfield int prim_len, ret; 4756ed7257bSPatrick Caulfield int addr_len; 4766ed7257bSPatrick Caulfield struct connection *new_con; 4776ed7257bSPatrick Caulfield sctp_peeloff_arg_t parg; 4786ed7257bSPatrick Caulfield int parglen = sizeof(parg); 4796861f350SDavid Teigland int err; 4806ed7257bSPatrick Caulfield 4816ed7257bSPatrick Caulfield /* 4826ed7257bSPatrick Caulfield * We get this before any data for an association. 4836ed7257bSPatrick Caulfield * We verify that the node is in the cluster and 4846ed7257bSPatrick Caulfield * then peel off a socket for it. 4856ed7257bSPatrick Caulfield */ 4866ed7257bSPatrick Caulfield if ((int)sn->sn_assoc_change.sac_assoc_id <= 0) { 4876ed7257bSPatrick Caulfield log_print("COMM_UP for invalid assoc ID %d", 4886ed7257bSPatrick Caulfield (int)sn->sn_assoc_change.sac_assoc_id); 4896ed7257bSPatrick Caulfield sctp_init_failed(); 4906ed7257bSPatrick Caulfield return; 4916ed7257bSPatrick Caulfield } 4926ed7257bSPatrick Caulfield memset(&prim, 0, sizeof(struct sctp_prim)); 4936ed7257bSPatrick Caulfield prim_len = sizeof(struct sctp_prim); 4946ed7257bSPatrick Caulfield prim.ssp_assoc_id = sn->sn_assoc_change.sac_assoc_id; 4956ed7257bSPatrick Caulfield 4966ed7257bSPatrick Caulfield ret = kernel_getsockopt(con->sock, 4976ed7257bSPatrick Caulfield IPPROTO_SCTP, 4986ed7257bSPatrick Caulfield SCTP_PRIMARY_ADDR, 4996ed7257bSPatrick Caulfield (char*)&prim, 5006ed7257bSPatrick Caulfield &prim_len); 5016ed7257bSPatrick Caulfield if (ret < 0) { 5026ed7257bSPatrick Caulfield log_print("getsockopt/sctp_primary_addr on " 5036ed7257bSPatrick Caulfield "new assoc %d failed : %d", 5046ed7257bSPatrick Caulfield (int)sn->sn_assoc_change.sac_assoc_id, 5056ed7257bSPatrick Caulfield ret); 5066ed7257bSPatrick Caulfield 5076ed7257bSPatrick Caulfield /* Retry INIT later */ 5086ed7257bSPatrick Caulfield new_con = assoc2con(sn->sn_assoc_change.sac_assoc_id); 5096ed7257bSPatrick Caulfield if (new_con) 5106ed7257bSPatrick Caulfield clear_bit(CF_CONNECT_PENDING, &con->flags); 5116ed7257bSPatrick Caulfield return; 5126ed7257bSPatrick Caulfield } 5136ed7257bSPatrick Caulfield make_sockaddr(&prim.ssp_addr, 0, &addr_len); 5146ed7257bSPatrick Caulfield if (dlm_addr_to_nodeid(&prim.ssp_addr, &nodeid)) { 5156ed7257bSPatrick Caulfield int i; 5166ed7257bSPatrick Caulfield unsigned char *b=(unsigned char *)&prim.ssp_addr; 5176ed7257bSPatrick Caulfield log_print("reject connect from unknown addr"); 5186ed7257bSPatrick Caulfield for (i=0; i<sizeof(struct sockaddr_storage);i++) 5196ed7257bSPatrick Caulfield printk("%02x ", b[i]); 5206ed7257bSPatrick Caulfield printk("\n"); 5216ed7257bSPatrick Caulfield sctp_send_shutdown(prim.ssp_assoc_id); 5226ed7257bSPatrick Caulfield return; 5236ed7257bSPatrick Caulfield } 5246ed7257bSPatrick Caulfield 525748285ccSDavid Teigland new_con = nodeid2con(nodeid, GFP_NOFS); 5266ed7257bSPatrick Caulfield if (!new_con) 5276ed7257bSPatrick Caulfield return; 5286ed7257bSPatrick Caulfield 5296ed7257bSPatrick Caulfield /* Peel off a new sock */ 5306ed7257bSPatrick Caulfield parg.associd = sn->sn_assoc_change.sac_assoc_id; 531617e82e1SDavid Teigland ret = kernel_getsockopt(con->sock, IPPROTO_SCTP, 532617e82e1SDavid Teigland SCTP_SOCKOPT_PEELOFF, 5336ed7257bSPatrick Caulfield (void *)&parg, &parglen); 5346861f350SDavid Teigland if (ret < 0) { 535617e82e1SDavid Teigland log_print("Can't peel off a socket for " 5366861f350SDavid Teigland "connection %d to node %d: err=%d", 5376ed7257bSPatrick Caulfield parg.associd, nodeid, ret); 5386861f350SDavid Teigland return; 5396ed7257bSPatrick Caulfield } 5406861f350SDavid Teigland new_con->sock = sockfd_lookup(parg.sd, &err); 5416861f350SDavid Teigland if (!new_con->sock) { 5426861f350SDavid Teigland log_print("sockfd_lookup error %d", err); 5436861f350SDavid Teigland return; 5446861f350SDavid Teigland } 5456ed7257bSPatrick Caulfield add_sock(new_con->sock, new_con); 5466861f350SDavid Teigland sockfd_put(new_con->sock); 5476ed7257bSPatrick Caulfield 5486861f350SDavid Teigland log_print("connecting to %d sctp association %d", 5496861f350SDavid Teigland nodeid, (int)sn->sn_assoc_change.sac_assoc_id); 5506ed7257bSPatrick Caulfield 5516ed7257bSPatrick Caulfield /* Send any pending writes */ 5526ed7257bSPatrick Caulfield clear_bit(CF_CONNECT_PENDING, &new_con->flags); 5536ed7257bSPatrick Caulfield clear_bit(CF_INIT_PENDING, &con->flags); 5546ed7257bSPatrick Caulfield if (!test_and_set_bit(CF_WRITE_PENDING, &new_con->flags)) { 5556ed7257bSPatrick Caulfield queue_work(send_workqueue, &new_con->swork); 5566ed7257bSPatrick Caulfield } 5576ed7257bSPatrick Caulfield if (!test_and_set_bit(CF_READ_PENDING, &new_con->flags)) 5586ed7257bSPatrick Caulfield queue_work(recv_workqueue, &new_con->rwork); 5596ed7257bSPatrick Caulfield } 5606ed7257bSPatrick Caulfield break; 5616ed7257bSPatrick Caulfield 5626ed7257bSPatrick Caulfield case SCTP_COMM_LOST: 5636ed7257bSPatrick Caulfield case SCTP_SHUTDOWN_COMP: 5646ed7257bSPatrick Caulfield { 5656ed7257bSPatrick Caulfield con = assoc2con(sn->sn_assoc_change.sac_assoc_id); 5666ed7257bSPatrick Caulfield if (con) { 5676ed7257bSPatrick Caulfield con->sctp_assoc = 0; 5686ed7257bSPatrick Caulfield } 5696ed7257bSPatrick Caulfield } 5706ed7257bSPatrick Caulfield break; 5716ed7257bSPatrick Caulfield 5726ed7257bSPatrick Caulfield /* We don't know which INIT failed, so clear the PENDING flags 5736ed7257bSPatrick Caulfield * on them all. if assoc_id is zero then it will then try 5746ed7257bSPatrick Caulfield * again */ 5756ed7257bSPatrick Caulfield 5766ed7257bSPatrick Caulfield case SCTP_CANT_STR_ASSOC: 5776ed7257bSPatrick Caulfield { 5786ed7257bSPatrick Caulfield log_print("Can't start SCTP association - retrying"); 5796ed7257bSPatrick Caulfield sctp_init_failed(); 5806ed7257bSPatrick Caulfield } 5816ed7257bSPatrick Caulfield break; 5826ed7257bSPatrick Caulfield 5836ed7257bSPatrick Caulfield default: 5846ed7257bSPatrick Caulfield log_print("unexpected SCTP assoc change id=%d state=%d", 5856ed7257bSPatrick Caulfield (int)sn->sn_assoc_change.sac_assoc_id, 5866ed7257bSPatrick Caulfield sn->sn_assoc_change.sac_state); 5876ed7257bSPatrick Caulfield } 5886ed7257bSPatrick Caulfield } 5896ed7257bSPatrick Caulfield } 5906ed7257bSPatrick Caulfield 5916ed7257bSPatrick Caulfield /* Data received from remote end */ 5926ed7257bSPatrick Caulfield static int receive_from_sock(struct connection *con) 5936ed7257bSPatrick Caulfield { 5946ed7257bSPatrick Caulfield int ret = 0; 5956ed7257bSPatrick Caulfield struct msghdr msg = {}; 5966ed7257bSPatrick Caulfield struct kvec iov[2]; 5976ed7257bSPatrick Caulfield unsigned len; 5986ed7257bSPatrick Caulfield int r; 5996ed7257bSPatrick Caulfield int call_again_soon = 0; 6006ed7257bSPatrick Caulfield int nvec; 6016ed7257bSPatrick Caulfield char incmsg[CMSG_SPACE(sizeof(struct sctp_sndrcvinfo))]; 6026ed7257bSPatrick Caulfield 6036ed7257bSPatrick Caulfield mutex_lock(&con->sock_mutex); 6046ed7257bSPatrick Caulfield 6056ed7257bSPatrick Caulfield if (con->sock == NULL) { 6066ed7257bSPatrick Caulfield ret = -EAGAIN; 6076ed7257bSPatrick Caulfield goto out_close; 6086ed7257bSPatrick Caulfield } 6096ed7257bSPatrick Caulfield 6106ed7257bSPatrick Caulfield if (con->rx_page == NULL) { 6116ed7257bSPatrick Caulfield /* 6126ed7257bSPatrick Caulfield * This doesn't need to be atomic, but I think it should 6136ed7257bSPatrick Caulfield * improve performance if it is. 6146ed7257bSPatrick Caulfield */ 6156ed7257bSPatrick Caulfield con->rx_page = alloc_page(GFP_ATOMIC); 6166ed7257bSPatrick Caulfield if (con->rx_page == NULL) 6176ed7257bSPatrick Caulfield goto out_resched; 6186ed7257bSPatrick Caulfield cbuf_init(&con->cb, PAGE_CACHE_SIZE); 6196ed7257bSPatrick Caulfield } 6206ed7257bSPatrick Caulfield 6216ed7257bSPatrick Caulfield /* Only SCTP needs these really */ 6226ed7257bSPatrick Caulfield memset(&incmsg, 0, sizeof(incmsg)); 6236ed7257bSPatrick Caulfield msg.msg_control = incmsg; 6246ed7257bSPatrick Caulfield msg.msg_controllen = sizeof(incmsg); 6256ed7257bSPatrick Caulfield 6266ed7257bSPatrick Caulfield /* 6276ed7257bSPatrick Caulfield * iov[0] is the bit of the circular buffer between the current end 6286ed7257bSPatrick Caulfield * point (cb.base + cb.len) and the end of the buffer. 6296ed7257bSPatrick Caulfield */ 6306ed7257bSPatrick Caulfield iov[0].iov_len = con->cb.base - cbuf_data(&con->cb); 6316ed7257bSPatrick Caulfield iov[0].iov_base = page_address(con->rx_page) + cbuf_data(&con->cb); 6326ed7257bSPatrick Caulfield iov[1].iov_len = 0; 6336ed7257bSPatrick Caulfield nvec = 1; 6346ed7257bSPatrick Caulfield 6356ed7257bSPatrick Caulfield /* 6366ed7257bSPatrick Caulfield * iov[1] is the bit of the circular buffer between the start of the 6376ed7257bSPatrick Caulfield * buffer and the start of the currently used section (cb.base) 6386ed7257bSPatrick Caulfield */ 6396ed7257bSPatrick Caulfield if (cbuf_data(&con->cb) >= con->cb.base) { 6406ed7257bSPatrick Caulfield iov[0].iov_len = PAGE_CACHE_SIZE - cbuf_data(&con->cb); 6416ed7257bSPatrick Caulfield iov[1].iov_len = con->cb.base; 6426ed7257bSPatrick Caulfield iov[1].iov_base = page_address(con->rx_page); 6436ed7257bSPatrick Caulfield nvec = 2; 6446ed7257bSPatrick Caulfield } 6456ed7257bSPatrick Caulfield len = iov[0].iov_len + iov[1].iov_len; 6466ed7257bSPatrick Caulfield 6476ed7257bSPatrick Caulfield r = ret = kernel_recvmsg(con->sock, &msg, iov, nvec, len, 6486ed7257bSPatrick Caulfield MSG_DONTWAIT | MSG_NOSIGNAL); 6496ed7257bSPatrick Caulfield if (ret <= 0) 6506ed7257bSPatrick Caulfield goto out_close; 6516ed7257bSPatrick Caulfield 6526ed7257bSPatrick Caulfield /* Process SCTP notifications */ 6536ed7257bSPatrick Caulfield if (msg.msg_flags & MSG_NOTIFICATION) { 6546ed7257bSPatrick Caulfield msg.msg_control = incmsg; 6556ed7257bSPatrick Caulfield msg.msg_controllen = sizeof(incmsg); 6566ed7257bSPatrick Caulfield 6576ed7257bSPatrick Caulfield process_sctp_notification(con, &msg, 6586ed7257bSPatrick Caulfield page_address(con->rx_page) + con->cb.base); 6596ed7257bSPatrick Caulfield mutex_unlock(&con->sock_mutex); 6606ed7257bSPatrick Caulfield return 0; 6616ed7257bSPatrick Caulfield } 6626ed7257bSPatrick Caulfield BUG_ON(con->nodeid == 0); 6636ed7257bSPatrick Caulfield 6646ed7257bSPatrick Caulfield if (ret == len) 6656ed7257bSPatrick Caulfield call_again_soon = 1; 6666ed7257bSPatrick Caulfield cbuf_add(&con->cb, ret); 6676ed7257bSPatrick Caulfield ret = dlm_process_incoming_buffer(con->nodeid, 6686ed7257bSPatrick Caulfield page_address(con->rx_page), 6696ed7257bSPatrick Caulfield con->cb.base, con->cb.len, 6706ed7257bSPatrick Caulfield PAGE_CACHE_SIZE); 6716ed7257bSPatrick Caulfield if (ret == -EBADMSG) { 672617e82e1SDavid Teigland log_print("lowcomms: addr=%p, base=%u, len=%u, " 673617e82e1SDavid Teigland "iov_len=%u, iov_base[0]=%p, read=%d", 6746ed7257bSPatrick Caulfield page_address(con->rx_page), con->cb.base, con->cb.len, 6756ed7257bSPatrick Caulfield len, iov[0].iov_base, r); 6766ed7257bSPatrick Caulfield } 6776ed7257bSPatrick Caulfield if (ret < 0) 6786ed7257bSPatrick Caulfield goto out_close; 6796ed7257bSPatrick Caulfield cbuf_eat(&con->cb, ret); 6806ed7257bSPatrick Caulfield 6816ed7257bSPatrick Caulfield if (cbuf_empty(&con->cb) && !call_again_soon) { 6826ed7257bSPatrick Caulfield __free_page(con->rx_page); 6836ed7257bSPatrick Caulfield con->rx_page = NULL; 6846ed7257bSPatrick Caulfield } 6856ed7257bSPatrick Caulfield 6866ed7257bSPatrick Caulfield if (call_again_soon) 6876ed7257bSPatrick Caulfield goto out_resched; 6886ed7257bSPatrick Caulfield mutex_unlock(&con->sock_mutex); 6896ed7257bSPatrick Caulfield return 0; 6906ed7257bSPatrick Caulfield 6916ed7257bSPatrick Caulfield out_resched: 6926ed7257bSPatrick Caulfield if (!test_and_set_bit(CF_READ_PENDING, &con->flags)) 6936ed7257bSPatrick Caulfield queue_work(recv_workqueue, &con->rwork); 6946ed7257bSPatrick Caulfield mutex_unlock(&con->sock_mutex); 6956ed7257bSPatrick Caulfield return -EAGAIN; 6966ed7257bSPatrick Caulfield 6976ed7257bSPatrick Caulfield out_close: 6986ed7257bSPatrick Caulfield mutex_unlock(&con->sock_mutex); 6999e5f2825SPatrick Caulfield if (ret != -EAGAIN) { 7006ed7257bSPatrick Caulfield close_connection(con, false); 7016ed7257bSPatrick Caulfield /* Reconnect when there is something to send */ 7026ed7257bSPatrick Caulfield } 7036ed7257bSPatrick Caulfield /* Don't return success if we really got EOF */ 7046ed7257bSPatrick Caulfield if (ret == 0) 7056ed7257bSPatrick Caulfield ret = -EAGAIN; 7066ed7257bSPatrick Caulfield 7076ed7257bSPatrick Caulfield return ret; 7086ed7257bSPatrick Caulfield } 7096ed7257bSPatrick Caulfield 7106ed7257bSPatrick Caulfield /* Listening socket is busy, accept a connection */ 7116ed7257bSPatrick Caulfield static int tcp_accept_from_sock(struct connection *con) 7126ed7257bSPatrick Caulfield { 7136ed7257bSPatrick Caulfield int result; 7146ed7257bSPatrick Caulfield struct sockaddr_storage peeraddr; 7156ed7257bSPatrick Caulfield struct socket *newsock; 7166ed7257bSPatrick Caulfield int len; 7176ed7257bSPatrick Caulfield int nodeid; 7186ed7257bSPatrick Caulfield struct connection *newcon; 7196ed7257bSPatrick Caulfield struct connection *addcon; 7206ed7257bSPatrick Caulfield 7216ed7257bSPatrick Caulfield memset(&peeraddr, 0, sizeof(peeraddr)); 7226ed7257bSPatrick Caulfield result = sock_create_kern(dlm_local_addr[0]->ss_family, SOCK_STREAM, 7236ed7257bSPatrick Caulfield IPPROTO_TCP, &newsock); 7246ed7257bSPatrick Caulfield if (result < 0) 7256ed7257bSPatrick Caulfield return -ENOMEM; 7266ed7257bSPatrick Caulfield 7276ed7257bSPatrick Caulfield mutex_lock_nested(&con->sock_mutex, 0); 7286ed7257bSPatrick Caulfield 7296ed7257bSPatrick Caulfield result = -ENOTCONN; 7306ed7257bSPatrick Caulfield if (con->sock == NULL) 7316ed7257bSPatrick Caulfield goto accept_err; 7326ed7257bSPatrick Caulfield 7336ed7257bSPatrick Caulfield newsock->type = con->sock->type; 7346ed7257bSPatrick Caulfield newsock->ops = con->sock->ops; 7356ed7257bSPatrick Caulfield 7366ed7257bSPatrick Caulfield result = con->sock->ops->accept(con->sock, newsock, O_NONBLOCK); 7376ed7257bSPatrick Caulfield if (result < 0) 7386ed7257bSPatrick Caulfield goto accept_err; 7396ed7257bSPatrick Caulfield 7406ed7257bSPatrick Caulfield /* Get the connected socket's peer */ 7416ed7257bSPatrick Caulfield memset(&peeraddr, 0, sizeof(peeraddr)); 7426ed7257bSPatrick Caulfield if (newsock->ops->getname(newsock, (struct sockaddr *)&peeraddr, 7436ed7257bSPatrick Caulfield &len, 2)) { 7446ed7257bSPatrick Caulfield result = -ECONNABORTED; 7456ed7257bSPatrick Caulfield goto accept_err; 7466ed7257bSPatrick Caulfield } 7476ed7257bSPatrick Caulfield 7486ed7257bSPatrick Caulfield /* Get the new node's NODEID */ 7496ed7257bSPatrick Caulfield make_sockaddr(&peeraddr, 0, &len); 7506ed7257bSPatrick Caulfield if (dlm_addr_to_nodeid(&peeraddr, &nodeid)) { 751617e82e1SDavid Teigland log_print("connect from non cluster node"); 7526ed7257bSPatrick Caulfield sock_release(newsock); 7536ed7257bSPatrick Caulfield mutex_unlock(&con->sock_mutex); 7546ed7257bSPatrick Caulfield return -1; 7556ed7257bSPatrick Caulfield } 7566ed7257bSPatrick Caulfield 7576ed7257bSPatrick Caulfield log_print("got connection from %d", nodeid); 7586ed7257bSPatrick Caulfield 7596ed7257bSPatrick Caulfield /* Check to see if we already have a connection to this node. This 7606ed7257bSPatrick Caulfield * could happen if the two nodes initiate a connection at roughly 7616ed7257bSPatrick Caulfield * the same time and the connections cross on the wire. 7626ed7257bSPatrick Caulfield * In this case we store the incoming one in "othercon" 7636ed7257bSPatrick Caulfield */ 764748285ccSDavid Teigland newcon = nodeid2con(nodeid, GFP_NOFS); 7656ed7257bSPatrick Caulfield if (!newcon) { 7666ed7257bSPatrick Caulfield result = -ENOMEM; 7676ed7257bSPatrick Caulfield goto accept_err; 7686ed7257bSPatrick Caulfield } 7696ed7257bSPatrick Caulfield mutex_lock_nested(&newcon->sock_mutex, 1); 7706ed7257bSPatrick Caulfield if (newcon->sock) { 7716ed7257bSPatrick Caulfield struct connection *othercon = newcon->othercon; 7726ed7257bSPatrick Caulfield 7736ed7257bSPatrick Caulfield if (!othercon) { 774748285ccSDavid Teigland othercon = kmem_cache_zalloc(con_cache, GFP_NOFS); 7756ed7257bSPatrick Caulfield if (!othercon) { 776617e82e1SDavid Teigland log_print("failed to allocate incoming socket"); 7776ed7257bSPatrick Caulfield mutex_unlock(&newcon->sock_mutex); 7786ed7257bSPatrick Caulfield result = -ENOMEM; 7796ed7257bSPatrick Caulfield goto accept_err; 7806ed7257bSPatrick Caulfield } 7816ed7257bSPatrick Caulfield othercon->nodeid = nodeid; 7826ed7257bSPatrick Caulfield othercon->rx_action = receive_from_sock; 7836ed7257bSPatrick Caulfield mutex_init(&othercon->sock_mutex); 7846ed7257bSPatrick Caulfield INIT_WORK(&othercon->swork, process_send_sockets); 7856ed7257bSPatrick Caulfield INIT_WORK(&othercon->rwork, process_recv_sockets); 7866ed7257bSPatrick Caulfield set_bit(CF_IS_OTHERCON, &othercon->flags); 78761d96be0SPatrick Caulfield } 78861d96be0SPatrick Caulfield if (!othercon->sock) { 7896ed7257bSPatrick Caulfield newcon->othercon = othercon; 7906ed7257bSPatrick Caulfield othercon->sock = newsock; 7916ed7257bSPatrick Caulfield newsock->sk->sk_user_data = othercon; 7926ed7257bSPatrick Caulfield add_sock(newsock, othercon); 7936ed7257bSPatrick Caulfield addcon = othercon; 7946ed7257bSPatrick Caulfield } 7956ed7257bSPatrick Caulfield else { 79697d84836SPatrick Caulfield printk("Extra connection from node %d attempted\n", nodeid); 79797d84836SPatrick Caulfield result = -EAGAIN; 798f4fadb23Sakpm@linux-foundation.org mutex_unlock(&newcon->sock_mutex); 79997d84836SPatrick Caulfield goto accept_err; 80097d84836SPatrick Caulfield } 80197d84836SPatrick Caulfield } 80297d84836SPatrick Caulfield else { 8036ed7257bSPatrick Caulfield newsock->sk->sk_user_data = newcon; 8046ed7257bSPatrick Caulfield newcon->rx_action = receive_from_sock; 8056ed7257bSPatrick Caulfield add_sock(newsock, newcon); 8066ed7257bSPatrick Caulfield addcon = newcon; 8076ed7257bSPatrick Caulfield } 8086ed7257bSPatrick Caulfield 8096ed7257bSPatrick Caulfield mutex_unlock(&newcon->sock_mutex); 8106ed7257bSPatrick Caulfield 8116ed7257bSPatrick Caulfield /* 8126ed7257bSPatrick Caulfield * Add it to the active queue in case we got data 81325985edcSLucas De Marchi * between processing the accept adding the socket 8146ed7257bSPatrick Caulfield * to the read_sockets list 8156ed7257bSPatrick Caulfield */ 8166ed7257bSPatrick Caulfield if (!test_and_set_bit(CF_READ_PENDING, &addcon->flags)) 8176ed7257bSPatrick Caulfield queue_work(recv_workqueue, &addcon->rwork); 8186ed7257bSPatrick Caulfield mutex_unlock(&con->sock_mutex); 8196ed7257bSPatrick Caulfield 8206ed7257bSPatrick Caulfield return 0; 8216ed7257bSPatrick Caulfield 8226ed7257bSPatrick Caulfield accept_err: 8236ed7257bSPatrick Caulfield mutex_unlock(&con->sock_mutex); 8246ed7257bSPatrick Caulfield sock_release(newsock); 8256ed7257bSPatrick Caulfield 8266ed7257bSPatrick Caulfield if (result != -EAGAIN) 827617e82e1SDavid Teigland log_print("error accepting connection from node: %d", result); 8286ed7257bSPatrick Caulfield return result; 8296ed7257bSPatrick Caulfield } 8306ed7257bSPatrick Caulfield 8316ed7257bSPatrick Caulfield static void free_entry(struct writequeue_entry *e) 8326ed7257bSPatrick Caulfield { 8336ed7257bSPatrick Caulfield __free_page(e->page); 8346ed7257bSPatrick Caulfield kfree(e); 8356ed7257bSPatrick Caulfield } 8366ed7257bSPatrick Caulfield 8376ed7257bSPatrick Caulfield /* Initiate an SCTP association. 8386ed7257bSPatrick Caulfield This is a special case of send_to_sock() in that we don't yet have a 8396ed7257bSPatrick Caulfield peeled-off socket for this association, so we use the listening socket 8406ed7257bSPatrick Caulfield and add the primary IP address of the remote node. 8416ed7257bSPatrick Caulfield */ 8426ed7257bSPatrick Caulfield static void sctp_init_assoc(struct connection *con) 8436ed7257bSPatrick Caulfield { 8446ed7257bSPatrick Caulfield struct sockaddr_storage rem_addr; 8456ed7257bSPatrick Caulfield char outcmsg[CMSG_SPACE(sizeof(struct sctp_sndrcvinfo))]; 8466ed7257bSPatrick Caulfield struct msghdr outmessage; 8476ed7257bSPatrick Caulfield struct cmsghdr *cmsg; 8486ed7257bSPatrick Caulfield struct sctp_sndrcvinfo *sinfo; 8496ed7257bSPatrick Caulfield struct connection *base_con; 8506ed7257bSPatrick Caulfield struct writequeue_entry *e; 8516ed7257bSPatrick Caulfield int len, offset; 8526ed7257bSPatrick Caulfield int ret; 8536ed7257bSPatrick Caulfield int addrlen; 8546ed7257bSPatrick Caulfield struct kvec iov[1]; 8556ed7257bSPatrick Caulfield 8566ed7257bSPatrick Caulfield if (test_and_set_bit(CF_INIT_PENDING, &con->flags)) 8576ed7257bSPatrick Caulfield return; 8586ed7257bSPatrick Caulfield 8596ed7257bSPatrick Caulfield if (con->retries++ > MAX_CONNECT_RETRIES) 8606ed7257bSPatrick Caulfield return; 8616ed7257bSPatrick Caulfield 8626ed7257bSPatrick Caulfield if (nodeid_to_addr(con->nodeid, (struct sockaddr *)&rem_addr)) { 8636ed7257bSPatrick Caulfield log_print("no address for nodeid %d", con->nodeid); 8646ed7257bSPatrick Caulfield return; 8656ed7257bSPatrick Caulfield } 8666ed7257bSPatrick Caulfield base_con = nodeid2con(0, 0); 8676ed7257bSPatrick Caulfield BUG_ON(base_con == NULL); 8686ed7257bSPatrick Caulfield 8696ed7257bSPatrick Caulfield make_sockaddr(&rem_addr, dlm_config.ci_tcp_port, &addrlen); 8706ed7257bSPatrick Caulfield 8716ed7257bSPatrick Caulfield outmessage.msg_name = &rem_addr; 8726ed7257bSPatrick Caulfield outmessage.msg_namelen = addrlen; 8736ed7257bSPatrick Caulfield outmessage.msg_control = outcmsg; 8746ed7257bSPatrick Caulfield outmessage.msg_controllen = sizeof(outcmsg); 8756ed7257bSPatrick Caulfield outmessage.msg_flags = MSG_EOR; 8766ed7257bSPatrick Caulfield 8776ed7257bSPatrick Caulfield spin_lock(&con->writequeue_lock); 8786ed7257bSPatrick Caulfield 87904bedd79SDavid Teigland if (list_empty(&con->writequeue)) { 88004bedd79SDavid Teigland spin_unlock(&con->writequeue_lock); 88104bedd79SDavid Teigland log_print("writequeue empty for nodeid %d", con->nodeid); 88204bedd79SDavid Teigland return; 88304bedd79SDavid Teigland } 8846ed7257bSPatrick Caulfield 88504bedd79SDavid Teigland e = list_first_entry(&con->writequeue, struct writequeue_entry, list); 8866ed7257bSPatrick Caulfield len = e->len; 8876ed7257bSPatrick Caulfield offset = e->offset; 8886ed7257bSPatrick Caulfield spin_unlock(&con->writequeue_lock); 8896ed7257bSPatrick Caulfield 8906ed7257bSPatrick Caulfield /* Send the first block off the write queue */ 8916ed7257bSPatrick Caulfield iov[0].iov_base = page_address(e->page)+offset; 8926ed7257bSPatrick Caulfield iov[0].iov_len = len; 8936ed7257bSPatrick Caulfield 8946ed7257bSPatrick Caulfield cmsg = CMSG_FIRSTHDR(&outmessage); 8956ed7257bSPatrick Caulfield cmsg->cmsg_level = IPPROTO_SCTP; 8966ed7257bSPatrick Caulfield cmsg->cmsg_type = SCTP_SNDRCV; 8976ed7257bSPatrick Caulfield cmsg->cmsg_len = CMSG_LEN(sizeof(struct sctp_sndrcvinfo)); 8986ed7257bSPatrick Caulfield sinfo = CMSG_DATA(cmsg); 8996ed7257bSPatrick Caulfield memset(sinfo, 0x00, sizeof(struct sctp_sndrcvinfo)); 9006ed7257bSPatrick Caulfield sinfo->sinfo_ppid = cpu_to_le32(dlm_our_nodeid()); 9016ed7257bSPatrick Caulfield outmessage.msg_controllen = cmsg->cmsg_len; 9026ed7257bSPatrick Caulfield 9036ed7257bSPatrick Caulfield ret = kernel_sendmsg(base_con->sock, &outmessage, iov, 1, len); 9046ed7257bSPatrick Caulfield if (ret < 0) { 905617e82e1SDavid Teigland log_print("Send first packet to node %d failed: %d", 906617e82e1SDavid Teigland con->nodeid, ret); 9076ed7257bSPatrick Caulfield 9086ed7257bSPatrick Caulfield /* Try again later */ 9096ed7257bSPatrick Caulfield clear_bit(CF_CONNECT_PENDING, &con->flags); 9106ed7257bSPatrick Caulfield clear_bit(CF_INIT_PENDING, &con->flags); 9116ed7257bSPatrick Caulfield } 9126ed7257bSPatrick Caulfield else { 9136ed7257bSPatrick Caulfield spin_lock(&con->writequeue_lock); 9146ed7257bSPatrick Caulfield e->offset += ret; 9156ed7257bSPatrick Caulfield e->len -= ret; 9166ed7257bSPatrick Caulfield 9176ed7257bSPatrick Caulfield if (e->len == 0 && e->users == 0) { 9186ed7257bSPatrick Caulfield list_del(&e->list); 9196ed7257bSPatrick Caulfield free_entry(e); 9206ed7257bSPatrick Caulfield } 9216ed7257bSPatrick Caulfield spin_unlock(&con->writequeue_lock); 9226ed7257bSPatrick Caulfield } 9236ed7257bSPatrick Caulfield } 9246ed7257bSPatrick Caulfield 9256ed7257bSPatrick Caulfield /* Connect a new socket to its peer */ 9266ed7257bSPatrick Caulfield static void tcp_connect_to_sock(struct connection *con) 9276ed7257bSPatrick Caulfield { 9286ed7257bSPatrick Caulfield int result = -EHOSTUNREACH; 9296bd8fedaSLon Hohberger struct sockaddr_storage saddr, src_addr; 9306ed7257bSPatrick Caulfield int addr_len; 931a89d63a1SCasey Dahlin struct socket *sock = NULL; 932cb2d45daSDavid Teigland int one = 1; 9336ed7257bSPatrick Caulfield 9346ed7257bSPatrick Caulfield if (con->nodeid == 0) { 9356ed7257bSPatrick Caulfield log_print("attempt to connect sock 0 foiled"); 9366ed7257bSPatrick Caulfield return; 9376ed7257bSPatrick Caulfield } 9386ed7257bSPatrick Caulfield 9396ed7257bSPatrick Caulfield mutex_lock(&con->sock_mutex); 9406ed7257bSPatrick Caulfield if (con->retries++ > MAX_CONNECT_RETRIES) 9416ed7257bSPatrick Caulfield goto out; 9426ed7257bSPatrick Caulfield 9436ed7257bSPatrick Caulfield /* Some odd races can cause double-connects, ignore them */ 9446ed7257bSPatrick Caulfield if (con->sock) { 9456ed7257bSPatrick Caulfield result = 0; 9466ed7257bSPatrick Caulfield goto out; 9476ed7257bSPatrick Caulfield } 9486ed7257bSPatrick Caulfield 9496ed7257bSPatrick Caulfield /* Create a socket to communicate with */ 9506ed7257bSPatrick Caulfield result = sock_create_kern(dlm_local_addr[0]->ss_family, SOCK_STREAM, 9516ed7257bSPatrick Caulfield IPPROTO_TCP, &sock); 9526ed7257bSPatrick Caulfield if (result < 0) 9536ed7257bSPatrick Caulfield goto out_err; 9546ed7257bSPatrick Caulfield 9556ed7257bSPatrick Caulfield memset(&saddr, 0, sizeof(saddr)); 956b5711b8eSCasey Dahlin if (dlm_nodeid_to_addr(con->nodeid, &saddr)) 9576ed7257bSPatrick Caulfield goto out_err; 9586ed7257bSPatrick Caulfield 9596ed7257bSPatrick Caulfield sock->sk->sk_user_data = con; 9606ed7257bSPatrick Caulfield con->rx_action = receive_from_sock; 9616ed7257bSPatrick Caulfield con->connect_action = tcp_connect_to_sock; 9626ed7257bSPatrick Caulfield add_sock(sock, con); 9636ed7257bSPatrick Caulfield 9646bd8fedaSLon Hohberger /* Bind to our cluster-known address connecting to avoid 9656bd8fedaSLon Hohberger routing problems */ 9666bd8fedaSLon Hohberger memcpy(&src_addr, dlm_local_addr[0], sizeof(src_addr)); 9676bd8fedaSLon Hohberger make_sockaddr(&src_addr, 0, &addr_len); 9686bd8fedaSLon Hohberger result = sock->ops->bind(sock, (struct sockaddr *) &src_addr, 9696bd8fedaSLon Hohberger addr_len); 9706bd8fedaSLon Hohberger if (result < 0) { 9716bd8fedaSLon Hohberger log_print("could not bind for connect: %d", result); 9726bd8fedaSLon Hohberger /* This *may* not indicate a critical error */ 9736bd8fedaSLon Hohberger } 9746bd8fedaSLon Hohberger 9756ed7257bSPatrick Caulfield make_sockaddr(&saddr, dlm_config.ci_tcp_port, &addr_len); 9766ed7257bSPatrick Caulfield 9776ed7257bSPatrick Caulfield log_print("connecting to %d", con->nodeid); 978cb2d45daSDavid Teigland 979cb2d45daSDavid Teigland /* Turn off Nagle's algorithm */ 980cb2d45daSDavid Teigland kernel_setsockopt(sock, SOL_TCP, TCP_NODELAY, (char *)&one, 981cb2d45daSDavid Teigland sizeof(one)); 982cb2d45daSDavid Teigland 9836ed7257bSPatrick Caulfield result = 9846ed7257bSPatrick Caulfield sock->ops->connect(sock, (struct sockaddr *)&saddr, addr_len, 9856ed7257bSPatrick Caulfield O_NONBLOCK); 9866ed7257bSPatrick Caulfield if (result == -EINPROGRESS) 9876ed7257bSPatrick Caulfield result = 0; 9886ed7257bSPatrick Caulfield if (result == 0) 9896ed7257bSPatrick Caulfield goto out; 9906ed7257bSPatrick Caulfield 9916ed7257bSPatrick Caulfield out_err: 9926ed7257bSPatrick Caulfield if (con->sock) { 9936ed7257bSPatrick Caulfield sock_release(con->sock); 9946ed7257bSPatrick Caulfield con->sock = NULL; 995a89d63a1SCasey Dahlin } else if (sock) { 996a89d63a1SCasey Dahlin sock_release(sock); 9976ed7257bSPatrick Caulfield } 9986ed7257bSPatrick Caulfield /* 9996ed7257bSPatrick Caulfield * Some errors are fatal and this list might need adjusting. For other 10006ed7257bSPatrick Caulfield * errors we try again until the max number of retries is reached. 10016ed7257bSPatrick Caulfield */ 10026ed7257bSPatrick Caulfield if (result != -EHOSTUNREACH && result != -ENETUNREACH && 10030035a4b1SMarcin Slusarz result != -ENETDOWN && result != -EINVAL 10046ed7257bSPatrick Caulfield && result != -EPROTONOSUPPORT) { 10056ed7257bSPatrick Caulfield lowcomms_connect_sock(con); 10066ed7257bSPatrick Caulfield result = 0; 10076ed7257bSPatrick Caulfield } 10086ed7257bSPatrick Caulfield out: 10096ed7257bSPatrick Caulfield mutex_unlock(&con->sock_mutex); 10106ed7257bSPatrick Caulfield return; 10116ed7257bSPatrick Caulfield } 10126ed7257bSPatrick Caulfield 10136ed7257bSPatrick Caulfield static struct socket *tcp_create_listen_sock(struct connection *con, 10146ed7257bSPatrick Caulfield struct sockaddr_storage *saddr) 10156ed7257bSPatrick Caulfield { 10166ed7257bSPatrick Caulfield struct socket *sock = NULL; 10176ed7257bSPatrick Caulfield int result = 0; 10186ed7257bSPatrick Caulfield int one = 1; 10196ed7257bSPatrick Caulfield int addr_len; 10206ed7257bSPatrick Caulfield 10216ed7257bSPatrick Caulfield if (dlm_local_addr[0]->ss_family == AF_INET) 10226ed7257bSPatrick Caulfield addr_len = sizeof(struct sockaddr_in); 10236ed7257bSPatrick Caulfield else 10246ed7257bSPatrick Caulfield addr_len = sizeof(struct sockaddr_in6); 10256ed7257bSPatrick Caulfield 10266ed7257bSPatrick Caulfield /* Create a socket to communicate with */ 1027617e82e1SDavid Teigland result = sock_create_kern(dlm_local_addr[0]->ss_family, SOCK_STREAM, 1028617e82e1SDavid Teigland IPPROTO_TCP, &sock); 10296ed7257bSPatrick Caulfield if (result < 0) { 1030617e82e1SDavid Teigland log_print("Can't create listening comms socket"); 10316ed7257bSPatrick Caulfield goto create_out; 10326ed7257bSPatrick Caulfield } 10336ed7257bSPatrick Caulfield 1034cb2d45daSDavid Teigland /* Turn off Nagle's algorithm */ 1035cb2d45daSDavid Teigland kernel_setsockopt(sock, SOL_TCP, TCP_NODELAY, (char *)&one, 1036cb2d45daSDavid Teigland sizeof(one)); 1037cb2d45daSDavid Teigland 10386ed7257bSPatrick Caulfield result = kernel_setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, 10396ed7257bSPatrick Caulfield (char *)&one, sizeof(one)); 10406ed7257bSPatrick Caulfield 10416ed7257bSPatrick Caulfield if (result < 0) { 1042617e82e1SDavid Teigland log_print("Failed to set SO_REUSEADDR on socket: %d", result); 10436ed7257bSPatrick Caulfield } 10446ed7257bSPatrick Caulfield sock->sk->sk_user_data = con; 10456ed7257bSPatrick Caulfield con->rx_action = tcp_accept_from_sock; 10466ed7257bSPatrick Caulfield con->connect_action = tcp_connect_to_sock; 10476ed7257bSPatrick Caulfield con->sock = sock; 10486ed7257bSPatrick Caulfield 10496ed7257bSPatrick Caulfield /* Bind to our port */ 10506ed7257bSPatrick Caulfield make_sockaddr(saddr, dlm_config.ci_tcp_port, &addr_len); 10516ed7257bSPatrick Caulfield result = sock->ops->bind(sock, (struct sockaddr *) saddr, addr_len); 10526ed7257bSPatrick Caulfield if (result < 0) { 1053617e82e1SDavid Teigland log_print("Can't bind to port %d", dlm_config.ci_tcp_port); 10546ed7257bSPatrick Caulfield sock_release(sock); 10556ed7257bSPatrick Caulfield sock = NULL; 10566ed7257bSPatrick Caulfield con->sock = NULL; 10576ed7257bSPatrick Caulfield goto create_out; 10586ed7257bSPatrick Caulfield } 10596ed7257bSPatrick Caulfield result = kernel_setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, 10606ed7257bSPatrick Caulfield (char *)&one, sizeof(one)); 10616ed7257bSPatrick Caulfield if (result < 0) { 1062617e82e1SDavid Teigland log_print("Set keepalive failed: %d", result); 10636ed7257bSPatrick Caulfield } 10646ed7257bSPatrick Caulfield 10656ed7257bSPatrick Caulfield result = sock->ops->listen(sock, 5); 10666ed7257bSPatrick Caulfield if (result < 0) { 1067617e82e1SDavid Teigland log_print("Can't listen on port %d", dlm_config.ci_tcp_port); 10686ed7257bSPatrick Caulfield sock_release(sock); 10696ed7257bSPatrick Caulfield sock = NULL; 10706ed7257bSPatrick Caulfield goto create_out; 10716ed7257bSPatrick Caulfield } 10726ed7257bSPatrick Caulfield 10736ed7257bSPatrick Caulfield create_out: 10746ed7257bSPatrick Caulfield return sock; 10756ed7257bSPatrick Caulfield } 10766ed7257bSPatrick Caulfield 10776ed7257bSPatrick Caulfield /* Get local addresses */ 10786ed7257bSPatrick Caulfield static void init_local(void) 10796ed7257bSPatrick Caulfield { 10806ed7257bSPatrick Caulfield struct sockaddr_storage sas, *addr; 10816ed7257bSPatrick Caulfield int i; 10826ed7257bSPatrick Caulfield 108330d3a237SPatrick Caulfield dlm_local_count = 0; 10846ed7257bSPatrick Caulfield for (i = 0; i < DLM_MAX_ADDR_COUNT - 1; i++) { 10856ed7257bSPatrick Caulfield if (dlm_our_addr(&sas, i)) 10866ed7257bSPatrick Caulfield break; 10876ed7257bSPatrick Caulfield 1088573c24c4SDavid Teigland addr = kmalloc(sizeof(*addr), GFP_NOFS); 10896ed7257bSPatrick Caulfield if (!addr) 10906ed7257bSPatrick Caulfield break; 10916ed7257bSPatrick Caulfield memcpy(addr, &sas, sizeof(*addr)); 10926ed7257bSPatrick Caulfield dlm_local_addr[dlm_local_count++] = addr; 10936ed7257bSPatrick Caulfield } 10946ed7257bSPatrick Caulfield } 10956ed7257bSPatrick Caulfield 1096617e82e1SDavid Teigland /* Bind to an IP address. SCTP allows multiple address so it can do 1097617e82e1SDavid Teigland multi-homing */ 1098617e82e1SDavid Teigland static int add_sctp_bind_addr(struct connection *sctp_con, 1099617e82e1SDavid Teigland struct sockaddr_storage *addr, 1100617e82e1SDavid Teigland int addr_len, int num) 11016ed7257bSPatrick Caulfield { 11026ed7257bSPatrick Caulfield int result = 0; 11036ed7257bSPatrick Caulfield 11046ed7257bSPatrick Caulfield if (num == 1) 11056ed7257bSPatrick Caulfield result = kernel_bind(sctp_con->sock, 11066ed7257bSPatrick Caulfield (struct sockaddr *) addr, 11076ed7257bSPatrick Caulfield addr_len); 11086ed7257bSPatrick Caulfield else 11096ed7257bSPatrick Caulfield result = kernel_setsockopt(sctp_con->sock, SOL_SCTP, 11106ed7257bSPatrick Caulfield SCTP_SOCKOPT_BINDX_ADD, 11116ed7257bSPatrick Caulfield (char *)addr, addr_len); 11126ed7257bSPatrick Caulfield 11136ed7257bSPatrick Caulfield if (result < 0) 11146ed7257bSPatrick Caulfield log_print("Can't bind to port %d addr number %d", 11156ed7257bSPatrick Caulfield dlm_config.ci_tcp_port, num); 11166ed7257bSPatrick Caulfield 11176ed7257bSPatrick Caulfield return result; 11186ed7257bSPatrick Caulfield } 11196ed7257bSPatrick Caulfield 11206ed7257bSPatrick Caulfield /* Initialise SCTP socket and bind to all interfaces */ 11216ed7257bSPatrick Caulfield static int sctp_listen_for_all(void) 11226ed7257bSPatrick Caulfield { 11236ed7257bSPatrick Caulfield struct socket *sock = NULL; 11246ed7257bSPatrick Caulfield struct sockaddr_storage localaddr; 11256ed7257bSPatrick Caulfield struct sctp_event_subscribe subscribe; 11266ed7257bSPatrick Caulfield int result = -EINVAL, num = 1, i, addr_len; 1127573c24c4SDavid Teigland struct connection *con = nodeid2con(0, GFP_NOFS); 11286ed7257bSPatrick Caulfield int bufsize = NEEDED_RMEM; 11296ed7257bSPatrick Caulfield 11306ed7257bSPatrick Caulfield if (!con) 11316ed7257bSPatrick Caulfield return -ENOMEM; 11326ed7257bSPatrick Caulfield 11336ed7257bSPatrick Caulfield log_print("Using SCTP for communications"); 11346ed7257bSPatrick Caulfield 11356ed7257bSPatrick Caulfield result = sock_create_kern(dlm_local_addr[0]->ss_family, SOCK_SEQPACKET, 11366ed7257bSPatrick Caulfield IPPROTO_SCTP, &sock); 11376ed7257bSPatrick Caulfield if (result < 0) { 11386ed7257bSPatrick Caulfield log_print("Can't create comms socket, check SCTP is loaded"); 11396ed7257bSPatrick Caulfield goto out; 11406ed7257bSPatrick Caulfield } 11416ed7257bSPatrick Caulfield 11426ed7257bSPatrick Caulfield /* Listen for events */ 11436ed7257bSPatrick Caulfield memset(&subscribe, 0, sizeof(subscribe)); 11446ed7257bSPatrick Caulfield subscribe.sctp_data_io_event = 1; 11456ed7257bSPatrick Caulfield subscribe.sctp_association_event = 1; 11466ed7257bSPatrick Caulfield subscribe.sctp_send_failure_event = 1; 11476ed7257bSPatrick Caulfield subscribe.sctp_shutdown_event = 1; 11486ed7257bSPatrick Caulfield subscribe.sctp_partial_delivery_event = 1; 11496ed7257bSPatrick Caulfield 1150df61c952SDavid S. Miller result = kernel_setsockopt(sock, SOL_SOCKET, SO_RCVBUFFORCE, 11516ed7257bSPatrick Caulfield (char *)&bufsize, sizeof(bufsize)); 11526ed7257bSPatrick Caulfield if (result) 1153617e82e1SDavid Teigland log_print("Error increasing buffer space on socket %d", result); 11546ed7257bSPatrick Caulfield 11556ed7257bSPatrick Caulfield result = kernel_setsockopt(sock, SOL_SCTP, SCTP_EVENTS, 11566ed7257bSPatrick Caulfield (char *)&subscribe, sizeof(subscribe)); 11576ed7257bSPatrick Caulfield if (result < 0) { 11586ed7257bSPatrick Caulfield log_print("Failed to set SCTP_EVENTS on socket: result=%d", 11596ed7257bSPatrick Caulfield result); 11606ed7257bSPatrick Caulfield goto create_delsock; 11616ed7257bSPatrick Caulfield } 11626ed7257bSPatrick Caulfield 11636ed7257bSPatrick Caulfield /* Init con struct */ 11646ed7257bSPatrick Caulfield sock->sk->sk_user_data = con; 11656ed7257bSPatrick Caulfield con->sock = sock; 11666ed7257bSPatrick Caulfield con->sock->sk->sk_data_ready = lowcomms_data_ready; 11676ed7257bSPatrick Caulfield con->rx_action = receive_from_sock; 11686ed7257bSPatrick Caulfield con->connect_action = sctp_init_assoc; 11696ed7257bSPatrick Caulfield 11706ed7257bSPatrick Caulfield /* Bind to all interfaces. */ 11716ed7257bSPatrick Caulfield for (i = 0; i < dlm_local_count; i++) { 11726ed7257bSPatrick Caulfield memcpy(&localaddr, dlm_local_addr[i], sizeof(localaddr)); 11736ed7257bSPatrick Caulfield make_sockaddr(&localaddr, dlm_config.ci_tcp_port, &addr_len); 11746ed7257bSPatrick Caulfield 11756ed7257bSPatrick Caulfield result = add_sctp_bind_addr(con, &localaddr, addr_len, num); 11766ed7257bSPatrick Caulfield if (result) 11776ed7257bSPatrick Caulfield goto create_delsock; 11786ed7257bSPatrick Caulfield ++num; 11796ed7257bSPatrick Caulfield } 11806ed7257bSPatrick Caulfield 11816ed7257bSPatrick Caulfield result = sock->ops->listen(sock, 5); 11826ed7257bSPatrick Caulfield if (result < 0) { 11836ed7257bSPatrick Caulfield log_print("Can't set socket listening"); 11846ed7257bSPatrick Caulfield goto create_delsock; 11856ed7257bSPatrick Caulfield } 11866ed7257bSPatrick Caulfield 11876ed7257bSPatrick Caulfield return 0; 11886ed7257bSPatrick Caulfield 11896ed7257bSPatrick Caulfield create_delsock: 11906ed7257bSPatrick Caulfield sock_release(sock); 11916ed7257bSPatrick Caulfield con->sock = NULL; 11926ed7257bSPatrick Caulfield out: 11936ed7257bSPatrick Caulfield return result; 11946ed7257bSPatrick Caulfield } 11956ed7257bSPatrick Caulfield 11966ed7257bSPatrick Caulfield static int tcp_listen_for_all(void) 11976ed7257bSPatrick Caulfield { 11986ed7257bSPatrick Caulfield struct socket *sock = NULL; 1199573c24c4SDavid Teigland struct connection *con = nodeid2con(0, GFP_NOFS); 12006ed7257bSPatrick Caulfield int result = -EINVAL; 12016ed7257bSPatrick Caulfield 12026ed7257bSPatrick Caulfield if (!con) 12036ed7257bSPatrick Caulfield return -ENOMEM; 12046ed7257bSPatrick Caulfield 12056ed7257bSPatrick Caulfield /* We don't support multi-homed hosts */ 12066ed7257bSPatrick Caulfield if (dlm_local_addr[1] != NULL) { 1207617e82e1SDavid Teigland log_print("TCP protocol can't handle multi-homed hosts, " 1208617e82e1SDavid Teigland "try SCTP"); 12096ed7257bSPatrick Caulfield return -EINVAL; 12106ed7257bSPatrick Caulfield } 12116ed7257bSPatrick Caulfield 12126ed7257bSPatrick Caulfield log_print("Using TCP for communications"); 12136ed7257bSPatrick Caulfield 12146ed7257bSPatrick Caulfield sock = tcp_create_listen_sock(con, dlm_local_addr[0]); 12156ed7257bSPatrick Caulfield if (sock) { 12166ed7257bSPatrick Caulfield add_sock(sock, con); 12176ed7257bSPatrick Caulfield result = 0; 12186ed7257bSPatrick Caulfield } 12196ed7257bSPatrick Caulfield else { 12206ed7257bSPatrick Caulfield result = -EADDRINUSE; 12216ed7257bSPatrick Caulfield } 12226ed7257bSPatrick Caulfield 12236ed7257bSPatrick Caulfield return result; 12246ed7257bSPatrick Caulfield } 12256ed7257bSPatrick Caulfield 12266ed7257bSPatrick Caulfield 12276ed7257bSPatrick Caulfield 12286ed7257bSPatrick Caulfield static struct writequeue_entry *new_writequeue_entry(struct connection *con, 12296ed7257bSPatrick Caulfield gfp_t allocation) 12306ed7257bSPatrick Caulfield { 12316ed7257bSPatrick Caulfield struct writequeue_entry *entry; 12326ed7257bSPatrick Caulfield 12336ed7257bSPatrick Caulfield entry = kmalloc(sizeof(struct writequeue_entry), allocation); 12346ed7257bSPatrick Caulfield if (!entry) 12356ed7257bSPatrick Caulfield return NULL; 12366ed7257bSPatrick Caulfield 12376ed7257bSPatrick Caulfield entry->page = alloc_page(allocation); 12386ed7257bSPatrick Caulfield if (!entry->page) { 12396ed7257bSPatrick Caulfield kfree(entry); 12406ed7257bSPatrick Caulfield return NULL; 12416ed7257bSPatrick Caulfield } 12426ed7257bSPatrick Caulfield 12436ed7257bSPatrick Caulfield entry->offset = 0; 12446ed7257bSPatrick Caulfield entry->len = 0; 12456ed7257bSPatrick Caulfield entry->end = 0; 12466ed7257bSPatrick Caulfield entry->users = 0; 12476ed7257bSPatrick Caulfield entry->con = con; 12486ed7257bSPatrick Caulfield 12496ed7257bSPatrick Caulfield return entry; 12506ed7257bSPatrick Caulfield } 12516ed7257bSPatrick Caulfield 1252617e82e1SDavid Teigland void *dlm_lowcomms_get_buffer(int nodeid, int len, gfp_t allocation, char **ppc) 12536ed7257bSPatrick Caulfield { 12546ed7257bSPatrick Caulfield struct connection *con; 12556ed7257bSPatrick Caulfield struct writequeue_entry *e; 12566ed7257bSPatrick Caulfield int offset = 0; 12576ed7257bSPatrick Caulfield int users = 0; 12586ed7257bSPatrick Caulfield 12596ed7257bSPatrick Caulfield con = nodeid2con(nodeid, allocation); 12606ed7257bSPatrick Caulfield if (!con) 12616ed7257bSPatrick Caulfield return NULL; 12626ed7257bSPatrick Caulfield 12636ed7257bSPatrick Caulfield spin_lock(&con->writequeue_lock); 12646ed7257bSPatrick Caulfield e = list_entry(con->writequeue.prev, struct writequeue_entry, list); 12656ed7257bSPatrick Caulfield if ((&e->list == &con->writequeue) || 12666ed7257bSPatrick Caulfield (PAGE_CACHE_SIZE - e->end < len)) { 12676ed7257bSPatrick Caulfield e = NULL; 12686ed7257bSPatrick Caulfield } else { 12696ed7257bSPatrick Caulfield offset = e->end; 12706ed7257bSPatrick Caulfield e->end += len; 12716ed7257bSPatrick Caulfield users = e->users++; 12726ed7257bSPatrick Caulfield } 12736ed7257bSPatrick Caulfield spin_unlock(&con->writequeue_lock); 12746ed7257bSPatrick Caulfield 12756ed7257bSPatrick Caulfield if (e) { 12766ed7257bSPatrick Caulfield got_one: 12776ed7257bSPatrick Caulfield *ppc = page_address(e->page) + offset; 12786ed7257bSPatrick Caulfield return e; 12796ed7257bSPatrick Caulfield } 12806ed7257bSPatrick Caulfield 12816ed7257bSPatrick Caulfield e = new_writequeue_entry(con, allocation); 12826ed7257bSPatrick Caulfield if (e) { 12836ed7257bSPatrick Caulfield spin_lock(&con->writequeue_lock); 12846ed7257bSPatrick Caulfield offset = e->end; 12856ed7257bSPatrick Caulfield e->end += len; 12866ed7257bSPatrick Caulfield users = e->users++; 12876ed7257bSPatrick Caulfield list_add_tail(&e->list, &con->writequeue); 12886ed7257bSPatrick Caulfield spin_unlock(&con->writequeue_lock); 12896ed7257bSPatrick Caulfield goto got_one; 12906ed7257bSPatrick Caulfield } 12916ed7257bSPatrick Caulfield return NULL; 12926ed7257bSPatrick Caulfield } 12936ed7257bSPatrick Caulfield 12946ed7257bSPatrick Caulfield void dlm_lowcomms_commit_buffer(void *mh) 12956ed7257bSPatrick Caulfield { 12966ed7257bSPatrick Caulfield struct writequeue_entry *e = (struct writequeue_entry *)mh; 12976ed7257bSPatrick Caulfield struct connection *con = e->con; 12986ed7257bSPatrick Caulfield int users; 12996ed7257bSPatrick Caulfield 13006ed7257bSPatrick Caulfield spin_lock(&con->writequeue_lock); 13016ed7257bSPatrick Caulfield users = --e->users; 13026ed7257bSPatrick Caulfield if (users) 13036ed7257bSPatrick Caulfield goto out; 13046ed7257bSPatrick Caulfield e->len = e->end - e->offset; 13056ed7257bSPatrick Caulfield spin_unlock(&con->writequeue_lock); 13066ed7257bSPatrick Caulfield 13076ed7257bSPatrick Caulfield if (!test_and_set_bit(CF_WRITE_PENDING, &con->flags)) { 13086ed7257bSPatrick Caulfield queue_work(send_workqueue, &con->swork); 13096ed7257bSPatrick Caulfield } 13106ed7257bSPatrick Caulfield return; 13116ed7257bSPatrick Caulfield 13126ed7257bSPatrick Caulfield out: 13136ed7257bSPatrick Caulfield spin_unlock(&con->writequeue_lock); 13146ed7257bSPatrick Caulfield return; 13156ed7257bSPatrick Caulfield } 13166ed7257bSPatrick Caulfield 13176ed7257bSPatrick Caulfield /* Send a message */ 13186ed7257bSPatrick Caulfield static void send_to_sock(struct connection *con) 13196ed7257bSPatrick Caulfield { 13206ed7257bSPatrick Caulfield int ret = 0; 13216ed7257bSPatrick Caulfield const int msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL; 13226ed7257bSPatrick Caulfield struct writequeue_entry *e; 13236ed7257bSPatrick Caulfield int len, offset; 1324f92c8dd7SBob Peterson int count = 0; 13256ed7257bSPatrick Caulfield 13266ed7257bSPatrick Caulfield mutex_lock(&con->sock_mutex); 13276ed7257bSPatrick Caulfield if (con->sock == NULL) 13286ed7257bSPatrick Caulfield goto out_connect; 13296ed7257bSPatrick Caulfield 13306ed7257bSPatrick Caulfield spin_lock(&con->writequeue_lock); 13316ed7257bSPatrick Caulfield for (;;) { 13326ed7257bSPatrick Caulfield e = list_entry(con->writequeue.next, struct writequeue_entry, 13336ed7257bSPatrick Caulfield list); 13346ed7257bSPatrick Caulfield if ((struct list_head *) e == &con->writequeue) 13356ed7257bSPatrick Caulfield break; 13366ed7257bSPatrick Caulfield 13376ed7257bSPatrick Caulfield len = e->len; 13386ed7257bSPatrick Caulfield offset = e->offset; 13396ed7257bSPatrick Caulfield BUG_ON(len == 0 && e->users == 0); 13406ed7257bSPatrick Caulfield spin_unlock(&con->writequeue_lock); 13416ed7257bSPatrick Caulfield 13426ed7257bSPatrick Caulfield ret = 0; 13436ed7257bSPatrick Caulfield if (len) { 13441329e3f2SPaolo Bonzini ret = kernel_sendpage(con->sock, e->page, offset, len, 13456ed7257bSPatrick Caulfield msg_flags); 1346d66f8277SPatrick Caulfield if (ret == -EAGAIN || ret == 0) { 1347b36930ddSDavid Miller if (ret == -EAGAIN && 1348b36930ddSDavid Miller test_bit(SOCK_ASYNC_NOSPACE, &con->sock->flags) && 1349b36930ddSDavid Miller !test_and_set_bit(CF_APP_LIMITED, &con->flags)) { 1350b36930ddSDavid Miller /* Notify TCP that we're limited by the 1351b36930ddSDavid Miller * application window size. 1352b36930ddSDavid Miller */ 1353b36930ddSDavid Miller set_bit(SOCK_NOSPACE, &con->sock->flags); 1354b36930ddSDavid Miller con->sock->sk->sk_write_pending++; 1355b36930ddSDavid Miller } 1356d66f8277SPatrick Caulfield cond_resched(); 13576ed7257bSPatrick Caulfield goto out; 1358d66f8277SPatrick Caulfield } 13596ed7257bSPatrick Caulfield if (ret <= 0) 13606ed7257bSPatrick Caulfield goto send_error; 1361d66f8277SPatrick Caulfield } 1362f92c8dd7SBob Peterson 13636ed7257bSPatrick Caulfield /* Don't starve people filling buffers */ 1364f92c8dd7SBob Peterson if (++count >= MAX_SEND_MSG_COUNT) { 13656ed7257bSPatrick Caulfield cond_resched(); 1366f92c8dd7SBob Peterson count = 0; 1367f92c8dd7SBob Peterson } 13686ed7257bSPatrick Caulfield 13696ed7257bSPatrick Caulfield spin_lock(&con->writequeue_lock); 13706ed7257bSPatrick Caulfield e->offset += ret; 13716ed7257bSPatrick Caulfield e->len -= ret; 13726ed7257bSPatrick Caulfield 13736ed7257bSPatrick Caulfield if (e->len == 0 && e->users == 0) { 13746ed7257bSPatrick Caulfield list_del(&e->list); 13756ed7257bSPatrick Caulfield free_entry(e); 13766ed7257bSPatrick Caulfield continue; 13776ed7257bSPatrick Caulfield } 13786ed7257bSPatrick Caulfield } 13796ed7257bSPatrick Caulfield spin_unlock(&con->writequeue_lock); 13806ed7257bSPatrick Caulfield out: 13816ed7257bSPatrick Caulfield mutex_unlock(&con->sock_mutex); 13826ed7257bSPatrick Caulfield return; 13836ed7257bSPatrick Caulfield 13846ed7257bSPatrick Caulfield send_error: 13856ed7257bSPatrick Caulfield mutex_unlock(&con->sock_mutex); 13866ed7257bSPatrick Caulfield close_connection(con, false); 13876ed7257bSPatrick Caulfield lowcomms_connect_sock(con); 13886ed7257bSPatrick Caulfield return; 13896ed7257bSPatrick Caulfield 13906ed7257bSPatrick Caulfield out_connect: 13916ed7257bSPatrick Caulfield mutex_unlock(&con->sock_mutex); 13926ed7257bSPatrick Caulfield if (!test_bit(CF_INIT_PENDING, &con->flags)) 13936ed7257bSPatrick Caulfield lowcomms_connect_sock(con); 13946ed7257bSPatrick Caulfield return; 13956ed7257bSPatrick Caulfield } 13966ed7257bSPatrick Caulfield 13976ed7257bSPatrick Caulfield static void clean_one_writequeue(struct connection *con) 13986ed7257bSPatrick Caulfield { 13995e9ccc37SChristine Caulfield struct writequeue_entry *e, *safe; 14006ed7257bSPatrick Caulfield 14016ed7257bSPatrick Caulfield spin_lock(&con->writequeue_lock); 14025e9ccc37SChristine Caulfield list_for_each_entry_safe(e, safe, &con->writequeue, list) { 14036ed7257bSPatrick Caulfield list_del(&e->list); 14046ed7257bSPatrick Caulfield free_entry(e); 14056ed7257bSPatrick Caulfield } 14066ed7257bSPatrick Caulfield spin_unlock(&con->writequeue_lock); 14076ed7257bSPatrick Caulfield } 14086ed7257bSPatrick Caulfield 14096ed7257bSPatrick Caulfield /* Called from recovery when it knows that a node has 14106ed7257bSPatrick Caulfield left the cluster */ 14116ed7257bSPatrick Caulfield int dlm_lowcomms_close(int nodeid) 14126ed7257bSPatrick Caulfield { 14136ed7257bSPatrick Caulfield struct connection *con; 14146ed7257bSPatrick Caulfield 14156ed7257bSPatrick Caulfield log_print("closing connection to node %d", nodeid); 14166ed7257bSPatrick Caulfield con = nodeid2con(nodeid, 0); 14176ed7257bSPatrick Caulfield if (con) { 1418063c4c99SLars Marowsky-Bree clear_bit(CF_CONNECT_PENDING, &con->flags); 1419063c4c99SLars Marowsky-Bree clear_bit(CF_WRITE_PENDING, &con->flags); 1420063c4c99SLars Marowsky-Bree set_bit(CF_CLOSE, &con->flags); 1421063c4c99SLars Marowsky-Bree if (cancel_work_sync(&con->swork)) 1422063c4c99SLars Marowsky-Bree log_print("canceled swork for node %d", nodeid); 1423063c4c99SLars Marowsky-Bree if (cancel_work_sync(&con->rwork)) 1424063c4c99SLars Marowsky-Bree log_print("canceled rwork for node %d", nodeid); 14256ed7257bSPatrick Caulfield clean_one_writequeue(con); 14266ed7257bSPatrick Caulfield close_connection(con, true); 14276ed7257bSPatrick Caulfield } 14286ed7257bSPatrick Caulfield return 0; 14296ed7257bSPatrick Caulfield } 14306ed7257bSPatrick Caulfield 14316ed7257bSPatrick Caulfield /* Receive workqueue function */ 14326ed7257bSPatrick Caulfield static void process_recv_sockets(struct work_struct *work) 14336ed7257bSPatrick Caulfield { 14346ed7257bSPatrick Caulfield struct connection *con = container_of(work, struct connection, rwork); 14356ed7257bSPatrick Caulfield int err; 14366ed7257bSPatrick Caulfield 14376ed7257bSPatrick Caulfield clear_bit(CF_READ_PENDING, &con->flags); 14386ed7257bSPatrick Caulfield do { 14396ed7257bSPatrick Caulfield err = con->rx_action(con); 14406ed7257bSPatrick Caulfield } while (!err); 14416ed7257bSPatrick Caulfield } 14426ed7257bSPatrick Caulfield 14436ed7257bSPatrick Caulfield /* Send workqueue function */ 14446ed7257bSPatrick Caulfield static void process_send_sockets(struct work_struct *work) 14456ed7257bSPatrick Caulfield { 14466ed7257bSPatrick Caulfield struct connection *con = container_of(work, struct connection, swork); 14476ed7257bSPatrick Caulfield 14486ed7257bSPatrick Caulfield if (test_and_clear_bit(CF_CONNECT_PENDING, &con->flags)) { 14496ed7257bSPatrick Caulfield con->connect_action(con); 1450063c4c99SLars Marowsky-Bree set_bit(CF_WRITE_PENDING, &con->flags); 14516ed7257bSPatrick Caulfield } 1452063c4c99SLars Marowsky-Bree if (test_and_clear_bit(CF_WRITE_PENDING, &con->flags)) 14536ed7257bSPatrick Caulfield send_to_sock(con); 14546ed7257bSPatrick Caulfield } 14556ed7257bSPatrick Caulfield 14566ed7257bSPatrick Caulfield 14576ed7257bSPatrick Caulfield /* Discard all entries on the write queues */ 14586ed7257bSPatrick Caulfield static void clean_writequeues(void) 14596ed7257bSPatrick Caulfield { 14605e9ccc37SChristine Caulfield foreach_conn(clean_one_writequeue); 14616ed7257bSPatrick Caulfield } 14626ed7257bSPatrick Caulfield 14636ed7257bSPatrick Caulfield static void work_stop(void) 14646ed7257bSPatrick Caulfield { 14656ed7257bSPatrick Caulfield destroy_workqueue(recv_workqueue); 14666ed7257bSPatrick Caulfield destroy_workqueue(send_workqueue); 14676ed7257bSPatrick Caulfield } 14686ed7257bSPatrick Caulfield 14696ed7257bSPatrick Caulfield static int work_start(void) 14706ed7257bSPatrick Caulfield { 1471e43f055aSDavid Teigland recv_workqueue = alloc_workqueue("dlm_recv", 1472e43f055aSDavid Teigland WQ_UNBOUND | WQ_MEM_RECLAIM, 1); 1473b9d41052SNamhyung Kim if (!recv_workqueue) { 1474b9d41052SNamhyung Kim log_print("can't start dlm_recv"); 1475b9d41052SNamhyung Kim return -ENOMEM; 14766ed7257bSPatrick Caulfield } 14776ed7257bSPatrick Caulfield 1478e43f055aSDavid Teigland send_workqueue = alloc_workqueue("dlm_send", 1479e43f055aSDavid Teigland WQ_UNBOUND | WQ_MEM_RECLAIM, 1); 1480b9d41052SNamhyung Kim if (!send_workqueue) { 1481b9d41052SNamhyung Kim log_print("can't start dlm_send"); 14826ed7257bSPatrick Caulfield destroy_workqueue(recv_workqueue); 1483b9d41052SNamhyung Kim return -ENOMEM; 14846ed7257bSPatrick Caulfield } 14856ed7257bSPatrick Caulfield 14866ed7257bSPatrick Caulfield return 0; 14876ed7257bSPatrick Caulfield } 14886ed7257bSPatrick Caulfield 14895e9ccc37SChristine Caulfield static void stop_conn(struct connection *con) 14906ed7257bSPatrick Caulfield { 14919e5f2825SPatrick Caulfield con->flags |= 0x0F; 1492391fbdc5SChristine Caulfield if (con->sock && con->sock->sk) 1493afb853fbSPatrick Caulfield con->sock->sk->sk_user_data = NULL; 1494afb853fbSPatrick Caulfield } 14955e9ccc37SChristine Caulfield 14965e9ccc37SChristine Caulfield static void free_conn(struct connection *con) 14975e9ccc37SChristine Caulfield { 14985e9ccc37SChristine Caulfield close_connection(con, true); 14995e9ccc37SChristine Caulfield if (con->othercon) 15005e9ccc37SChristine Caulfield kmem_cache_free(con_cache, con->othercon); 15015e9ccc37SChristine Caulfield hlist_del(&con->list); 15025e9ccc37SChristine Caulfield kmem_cache_free(con_cache, con); 15036ed7257bSPatrick Caulfield } 15045e9ccc37SChristine Caulfield 15055e9ccc37SChristine Caulfield void dlm_lowcomms_stop(void) 15065e9ccc37SChristine Caulfield { 15075e9ccc37SChristine Caulfield /* Set all the flags to prevent any 15085e9ccc37SChristine Caulfield socket activity. 15095e9ccc37SChristine Caulfield */ 15105e9ccc37SChristine Caulfield mutex_lock(&connections_lock); 15115e9ccc37SChristine Caulfield foreach_conn(stop_conn); 15127a936ce7SMatthias Kaehlcke mutex_unlock(&connections_lock); 15136ed7257bSPatrick Caulfield 15146ed7257bSPatrick Caulfield work_stop(); 15156ed7257bSPatrick Caulfield 15167a936ce7SMatthias Kaehlcke mutex_lock(&connections_lock); 15176ed7257bSPatrick Caulfield clean_writequeues(); 15186ed7257bSPatrick Caulfield 15195e9ccc37SChristine Caulfield foreach_conn(free_conn); 15205e9ccc37SChristine Caulfield 15217a936ce7SMatthias Kaehlcke mutex_unlock(&connections_lock); 15226ed7257bSPatrick Caulfield kmem_cache_destroy(con_cache); 15236ed7257bSPatrick Caulfield } 15246ed7257bSPatrick Caulfield 15256ed7257bSPatrick Caulfield int dlm_lowcomms_start(void) 15266ed7257bSPatrick Caulfield { 15276ed7257bSPatrick Caulfield int error = -EINVAL; 15286ed7257bSPatrick Caulfield struct connection *con; 15295e9ccc37SChristine Caulfield int i; 15305e9ccc37SChristine Caulfield 15315e9ccc37SChristine Caulfield for (i = 0; i < CONN_HASH_SIZE; i++) 15325e9ccc37SChristine Caulfield INIT_HLIST_HEAD(&connection_hash[i]); 15336ed7257bSPatrick Caulfield 15346ed7257bSPatrick Caulfield init_local(); 15356ed7257bSPatrick Caulfield if (!dlm_local_count) { 1536617e82e1SDavid Teigland error = -ENOTCONN; 15376ed7257bSPatrick Caulfield log_print("no local IP address has been set"); 15386ed7257bSPatrick Caulfield goto out; 15396ed7257bSPatrick Caulfield } 15406ed7257bSPatrick Caulfield 15416ed7257bSPatrick Caulfield error = -ENOMEM; 15426ed7257bSPatrick Caulfield con_cache = kmem_cache_create("dlm_conn", sizeof(struct connection), 15436ed7257bSPatrick Caulfield __alignof__(struct connection), 0, 154420c2df83SPaul Mundt NULL); 15456ed7257bSPatrick Caulfield if (!con_cache) 15466ed7257bSPatrick Caulfield goto out; 15476ed7257bSPatrick Caulfield 15486ed7257bSPatrick Caulfield /* Start listening */ 15496ed7257bSPatrick Caulfield if (dlm_config.ci_protocol == 0) 15506ed7257bSPatrick Caulfield error = tcp_listen_for_all(); 15516ed7257bSPatrick Caulfield else 15526ed7257bSPatrick Caulfield error = sctp_listen_for_all(); 15536ed7257bSPatrick Caulfield if (error) 15546ed7257bSPatrick Caulfield goto fail_unlisten; 15556ed7257bSPatrick Caulfield 15566ed7257bSPatrick Caulfield error = work_start(); 15576ed7257bSPatrick Caulfield if (error) 15586ed7257bSPatrick Caulfield goto fail_unlisten; 15596ed7257bSPatrick Caulfield 15606ed7257bSPatrick Caulfield return 0; 15616ed7257bSPatrick Caulfield 15626ed7257bSPatrick Caulfield fail_unlisten: 15636ed7257bSPatrick Caulfield con = nodeid2con(0,0); 15646ed7257bSPatrick Caulfield if (con) { 15656ed7257bSPatrick Caulfield close_connection(con, false); 15666ed7257bSPatrick Caulfield kmem_cache_free(con_cache, con); 15676ed7257bSPatrick Caulfield } 15686ed7257bSPatrick Caulfield kmem_cache_destroy(con_cache); 15696ed7257bSPatrick Caulfield 15706ed7257bSPatrick Caulfield out: 15716ed7257bSPatrick Caulfield return error; 15726ed7257bSPatrick Caulfield } 1573