X-Git-Url: https://git.whamcloud.com/?p=fs%2Flustre-release.git;a=blobdiff_plain;f=lnet%2Flnet%2Facceptor.c;h=1209b183d6815df72378de41b5113b991ea28221;hp=717058c7c6add0f009aa07838626245555fe95fc;hb=3e42620b5b79170ec219e52d2a7e915559addba4;hpb=19205dfea419bac6f3bc58ed1b579b8caf79b895 diff --git a/lnet/lnet/acceptor.c b/lnet/lnet/acceptor.c index 717058c..1209b18 100644 --- a/lnet/lnet/acceptor.c +++ b/lnet/lnet/acceptor.c @@ -1,856 +1,535 @@ -/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*- - * vim:expandtab:shiftwidth=8:tabstop=8: +/* + * GPL HEADER START * - * Copyright (C) 2005 Cluster File Systems, Inc. + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * - * This file is part of Lustre, http://www.lustre.org. + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 only, + * as published by the Free Software Foundation. * - * Lustre is free software; you can redistribute it and/or - * modify it under the terms of version 2 of the GNU General Public - * License as published by the Free Software Foundation. + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License version 2 for more details (a copy is included + * in the LICENSE file that accompanied this code). * - * Lustre is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. + * You should have received a copy of the GNU General Public License + * version 2 along with this program; If not, see + * http://www.gnu.org/licenses/gpl-2.0.html * - * You should have received a copy of the GNU General Public License - * along with Lustre; if not, write to the Free Software - * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + * GPL HEADER END + */ +/* + * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved. + * Use is subject to license terms. * + * Copyright (c) 2011, 2017, Intel Corporation. + */ +/* + * This file is part of Lustre, http://www.lustre.org/ + * Lustre is a trademark of Sun Microsystems, Inc. */ #define DEBUG_SUBSYSTEM S_LNET + +#include +#include #include -#ifdef __KERNEL__ -static char *accept = "secure"; -CFS_MODULE_PARM(accept, "s", charp, 0444, - "Accept connections (secure|all|none)"); +static int accept_port = 988; +static int accept_backlog = 127; +static int accept_timeout = 5; + +static struct { + int pta_shutdown; + struct socket *pta_sock; + struct completion pta_signal; + struct net *pta_ns; + wait_queue_head_t pta_waitq; + atomic_t pta_ready; +#ifdef HAVE_SK_DATA_READY_ONE_ARG + void (*pta_odata)(struct sock *); +#else + void (*pta_odata)(struct sock *, int); +#endif +} lnet_acceptor_state = { + .pta_shutdown = 1 +}; -static int accept_port = 988; -CFS_MODULE_PARM(accept_port, "i", int, 0444, - "Acceptor's port (same on all nodes)"); +int +lnet_acceptor_port(void) +{ + return accept_port; +} -static int accept_backlog = 127; -CFS_MODULE_PARM(accept_backlog, "i", int, 0444, - "Acceptor's listen backlog"); +static inline int +lnet_accept_magic(__u32 magic, __u32 constant) +{ + return (magic == constant || + magic == __swab32(constant)); +} + +EXPORT_SYMBOL(lnet_acceptor_port); -static int accept_timeout = 5; -CFS_MODULE_PARM(accept_timeout, "i", int, 0644, - "Acceptor's timeout (seconds)"); +static char *accept_type = "secure"; -struct { - int pta_shutdown; - cfs_socket_t *pta_sock; - struct semaphore pta_signal; -} lnet_acceptor_state; +module_param_named(accept, accept_type, charp, 0444); +MODULE_PARM_DESC(accept, "Accept connections (secure|all|none)"); +module_param(accept_port, int, 0444); +MODULE_PARM_DESC(accept_port, "Acceptor's port (same on all nodes)"); +module_param(accept_backlog, int, 0444); +MODULE_PARM_DESC(accept_backlog, "Acceptor's listen backlog"); +module_param(accept_timeout, int, 0644); +MODULE_PARM_DESC(accept_timeout, "Acceptor's timeout (seconds)"); int lnet_acceptor_timeout(void) { - return accept_timeout; + return accept_timeout; } EXPORT_SYMBOL(lnet_acceptor_timeout); -int -lnet_acceptor_port(void) -{ - return accept_port; -} -EXPORT_SYMBOL(lnet_acceptor_port); - void -lnet_connect_console_error (int rc, lnet_nid_t peer_nid, - __u32 peer_ip, int peer_port) +lnet_connect_console_error (int rc, lnet_nid_t peer_nid, + __u32 peer_ip, int peer_port) { - switch (rc) { - /* "normal" errors */ - case -ECONNREFUSED: - CDEBUG(D_NETERROR, "Connection to %s at host %u.%u.%u.%u " - "on port %d was refused: " - "check that Lustre is running on that node.\n", - libcfs_nid2str(peer_nid), - HIPQUAD(peer_ip), peer_port); - break; - case -EHOSTUNREACH: - case -ENETUNREACH: - CDEBUG(D_NETERROR, "Connection to %s at host %u.%u.%u.%u " - "was unreachable: the network or that node may " - "be down, or Lustre may be misconfigured.\n", - libcfs_nid2str(peer_nid), HIPQUAD(peer_ip)); - break; - case -ETIMEDOUT: - CDEBUG(D_NETERROR, "Connection to %s at host %u.%u.%u.%u on " - "port %d took too long: that node may be hung " - "or experiencing high load.\n", - libcfs_nid2str(peer_nid), - HIPQUAD(peer_ip), peer_port); - break; - case -ECONNRESET: - LCONSOLE_ERROR_MSG(0x11b, "Connection to %s at host %u.%u.%u.%u" - " on port %d was reset: " - "is it running a compatible version of " - "Lustre and is %s one of its NIDs?\n", - libcfs_nid2str(peer_nid), - HIPQUAD(peer_ip), peer_port, - libcfs_nid2str(peer_nid)); - break; - case -EPROTO: - LCONSOLE_ERROR_MSG(0x11c, "Protocol error connecting to %s at " - "host %u.%u.%u.%u on port %d: is it running " - "a compatible version of Lustre?\n", - libcfs_nid2str(peer_nid), - HIPQUAD(peer_ip), peer_port); - break; - case -EADDRINUSE: - LCONSOLE_ERROR_MSG(0x11d, "No privileged ports available to " - "connect to %s at host %u.%u.%u.%u on port " - "%d\n", libcfs_nid2str(peer_nid), - HIPQUAD(peer_ip), peer_port); - break; - default: - LCONSOLE_ERROR_MSG(0x11e, "Unexpected error %d connecting to %s" - " at host %u.%u.%u.%u on port %d\n", rc, - libcfs_nid2str(peer_nid), - HIPQUAD(peer_ip), peer_port); - break; - } + switch (rc) { + /* "normal" errors */ + case -ECONNREFUSED: + CNETERR("Connection to %s at host %pI4h on port %d was " + "refused: check that Lustre is running on that node.\n", + libcfs_nid2str(peer_nid), &peer_ip, peer_port); + break; + case -EHOSTUNREACH: + case -ENETUNREACH: + CNETERR("Connection to %s at host %pI4h " + "was unreachable: the network or that node may " + "be down, or Lustre may be misconfigured.\n", + libcfs_nid2str(peer_nid), &peer_ip); + break; + case -ETIMEDOUT: + CNETERR("Connection to %s at host %pI4h on " + "port %d took too long: that node may be hung " + "or experiencing high load.\n", + libcfs_nid2str(peer_nid), &peer_ip, peer_port); + break; + case -ECONNRESET: + LCONSOLE_ERROR_MSG(0x11b, "Connection to %s at host %pI4h" + " on port %d was reset: " + "is it running a compatible version of " + "Lustre and is %s one of its NIDs?\n", + libcfs_nid2str(peer_nid), &peer_ip, + peer_port, libcfs_nid2str(peer_nid)); + break; + case -EPROTO: + LCONSOLE_ERROR_MSG(0x11c, "Protocol error connecting to %s at " + "host %pI4h on port %d: is it running " + "a compatible version of Lustre?\n", + libcfs_nid2str(peer_nid), &peer_ip, + peer_port); + break; + case -EADDRINUSE: + LCONSOLE_ERROR_MSG(0x11d, "No privileged ports available to " + "connect to %s at host %pI4h on port " + "%d\n", libcfs_nid2str(peer_nid), + &peer_ip, peer_port); + break; + default: + LCONSOLE_ERROR_MSG(0x11e, "Unexpected error %d connecting to %s" + " at host %pI4h on port %d\n", rc, + libcfs_nid2str(peer_nid), + &peer_ip, peer_port); + break; + } } EXPORT_SYMBOL(lnet_connect_console_error); -int -lnet_connect(cfs_socket_t **sockp, lnet_nid_t peer_nid, - __u32 local_ip, __u32 peer_ip, int peer_port) +struct socket * +lnet_connect(lnet_nid_t peer_nid, __u32 local_ip, __u32 peer_ip, + int peer_port, struct net *ns) { - lnet_acceptor_connreq_t cr; - cfs_socket_t *sock; - int rc; - int port; - int fatal; - - CLASSERT (sizeof(cr) <= 16); /* not too big to be on the stack */ - - for (port = LNET_ACCEPTOR_MAX_RESERVED_PORT; - port >= LNET_ACCEPTOR_MIN_RESERVED_PORT; - --port) { - /* Iterate through reserved ports. */ - - rc = libcfs_sock_connect(&sock, &fatal, - local_ip, port, - peer_ip, peer_port); - if (rc != 0) { - if (fatal) - goto failed; - continue; - } - - CLASSERT (LNET_PROTO_ACCEPTOR_VERSION == 1); - - if (the_lnet.ln_ptlcompat != 2) { - /* When portals compatibility is "strong", simply - * connect (i.e. send no acceptor connection request). - * Othewise send an acceptor connection request. I can - * have no portals peers so everyone else should - * understand my protocol. */ - cr.acr_magic = LNET_PROTO_ACCEPTOR_MAGIC; - cr.acr_version = LNET_PROTO_ACCEPTOR_VERSION; - cr.acr_nid = peer_nid; - - if (the_lnet.ln_testprotocompat != 0) { - /* single-shot proto check */ - LNET_LOCK(); - if ((the_lnet.ln_testprotocompat & 4) != 0) { - cr.acr_version++; - the_lnet.ln_testprotocompat &= ~4; - } - if ((the_lnet.ln_testprotocompat & 8) != 0) { - cr.acr_magic = LNET_PROTO_MAGIC; - the_lnet.ln_testprotocompat &= ~8; - } - LNET_UNLOCK(); - } - - rc = libcfs_sock_write(sock, &cr, sizeof(cr), - accept_timeout); - if (rc != 0) - goto failed_sock; - } - - *sockp = sock; - return 0; - } - - rc = -EADDRINUSE; - goto failed; - - failed_sock: - libcfs_sock_release(sock); - failed: - lnet_connect_console_error(rc, peer_nid, peer_ip, peer_port); - return rc; + struct lnet_acceptor_connreq cr; + struct socket *sock; + int rc; + int port; + + BUILD_BUG_ON(sizeof(cr) > 16); /* not too big to be on the stack */ + + for (port = LNET_ACCEPTOR_MAX_RESERVED_PORT; + port >= LNET_ACCEPTOR_MIN_RESERVED_PORT; + --port) { + /* Iterate through reserved ports. */ + + sock = lnet_sock_connect(local_ip, port, + peer_ip, peer_port, ns); + if (IS_ERR(sock)) { + rc = PTR_ERR(sock); + if (rc == -EADDRINUSE || rc == -EADDRNOTAVAIL) + continue; + goto failed; + } + + BUILD_BUG_ON(LNET_PROTO_ACCEPTOR_VERSION != 1); + + cr.acr_magic = LNET_PROTO_ACCEPTOR_MAGIC; + cr.acr_version = LNET_PROTO_ACCEPTOR_VERSION; + cr.acr_nid = peer_nid; + + if (the_lnet.ln_testprotocompat) { + /* single-shot proto check */ + if (test_and_clear_bit(2, &the_lnet.ln_testprotocompat)) + cr.acr_version++; + if (test_and_clear_bit(3, &the_lnet.ln_testprotocompat)) + cr.acr_magic = LNET_PROTO_MAGIC; + } + + rc = lnet_sock_write(sock, &cr, sizeof(cr), + accept_timeout); + if (rc != 0) + goto failed_sock; + + return sock; + } + + rc = -EADDRINUSE; + goto failed; + +failed_sock: + sock_release(sock); +failed: + lnet_connect_console_error(rc, peer_nid, peer_ip, peer_port); + return ERR_PTR(rc); } EXPORT_SYMBOL(lnet_connect); -static inline int -lnet_accept_magic(__u32 magic, __u32 constant) +static int +lnet_accept(struct socket *sock, __u32 magic) { - return (magic == constant || - magic == __swab32(constant)); + struct lnet_acceptor_connreq cr; + __u32 peer_ip; + int peer_port; + int rc; + int flip; + struct lnet_ni *ni; + char *str; + + LASSERT(sizeof(cr) <= 16); /* not too big for the stack */ + + rc = lnet_sock_getaddr(sock, true, &peer_ip, &peer_port); + LASSERT(rc == 0); /* we succeeded before */ + + if (!lnet_accept_magic(magic, LNET_PROTO_ACCEPTOR_MAGIC)) { + + if (lnet_accept_magic(magic, LNET_PROTO_MAGIC)) { + /* future version compatibility! + * When LNET unifies protocols over all LNDs, the first + * thing sent will be a version query. I send back + * LNET_PROTO_ACCEPTOR_MAGIC to tell her I'm "old" */ + + memset(&cr, 0, sizeof(cr)); + cr.acr_magic = LNET_PROTO_ACCEPTOR_MAGIC; + cr.acr_version = LNET_PROTO_ACCEPTOR_VERSION; + rc = lnet_sock_write(sock, &cr, sizeof(cr), + accept_timeout); + + if (rc != 0) + CERROR("Error sending magic+version in response to LNET magic from %pI4h: %d\n", + &peer_ip, rc); + return -EPROTO; + } + + if (lnet_accept_magic(magic, LNET_PROTO_TCP_MAGIC)) + str = "'old' socknal/tcpnal"; + else + str = "unrecognised"; + + LCONSOLE_ERROR_MSG(0x11f, "Refusing connection from %pI4h" + " magic %08x: %s acceptor protocol\n", + &peer_ip, magic, str); + return -EPROTO; + } + + flip = (magic != LNET_PROTO_ACCEPTOR_MAGIC); + + rc = lnet_sock_read(sock, &cr.acr_version, + sizeof(cr.acr_version), + accept_timeout); + if (rc != 0) { + CERROR("Error %d reading connection request version from " + "%pI4h\n", rc, &peer_ip); + return -EIO; + } + + if (flip) + __swab32s(&cr.acr_version); + + if (cr.acr_version != LNET_PROTO_ACCEPTOR_VERSION) { + /* future version compatibility! + * An acceptor-specific protocol rev will first send a version + * query. I send back my current version to tell her I'm + * "old". */ + int peer_version = cr.acr_version; + + memset(&cr, 0, sizeof(cr)); + cr.acr_magic = LNET_PROTO_ACCEPTOR_MAGIC; + cr.acr_version = LNET_PROTO_ACCEPTOR_VERSION; + + rc = lnet_sock_write(sock, &cr, sizeof(cr), + accept_timeout); + + if (rc != 0) + CERROR("Error sending magic+version in response to version %d from %pI4h: %d\n", + peer_version, &peer_ip, rc); + return -EPROTO; + } + + rc = lnet_sock_read(sock, &cr.acr_nid, + sizeof(cr) - + offsetof(struct lnet_acceptor_connreq, acr_nid), + accept_timeout); + if (rc != 0) { + CERROR("Error %d reading connection request from " + "%pI4h\n", rc, &peer_ip); + return -EIO; + } + + if (flip) + __swab64s(&cr.acr_nid); + + ni = lnet_nid2ni_addref(cr.acr_nid); + if (ni == NULL || /* no matching net */ + ni->ni_nid != cr.acr_nid) { /* right NET, wrong NID! */ + if (ni != NULL) + lnet_ni_decref(ni); + LCONSOLE_ERROR_MSG(0x120, "Refusing connection from %pI4h " + "for %s: No matching NI\n", + &peer_ip, libcfs_nid2str(cr.acr_nid)); + return -EPERM; + } + + if (ni->ni_net->net_lnd->lnd_accept == NULL) { + /* This catches a request for the loopback LND */ + lnet_ni_decref(ni); + LCONSOLE_ERROR_MSG(0x121, "Refusing connection from %pI4h " + "for %s: NI doesn not accept IP connections\n", + &peer_ip, libcfs_nid2str(cr.acr_nid)); + return -EPERM; + } + + CDEBUG(D_NET, "Accept %s from %pI4h\n", + libcfs_nid2str(cr.acr_nid), &peer_ip); + + rc = ni->ni_net->net_lnd->lnd_accept(ni, sock); + + lnet_ni_decref(ni); + return rc; } -int -lnet_accept(lnet_ni_t *blind_ni, cfs_socket_t *sock, __u32 magic) +#ifdef HAVE_SK_DATA_READY_ONE_ARG +static void lnet_acceptor_ready(struct sock *sk) +#else +static void lnet_acceptor_ready(struct sock *sk, int len) +#endif { - lnet_acceptor_connreq_t cr; - __u32 peer_ip; - int peer_port; - int rc; - int flip; - lnet_ni_t *ni; - char *str; - - /* CAVEAT EMPTOR: I may be called by an LND in any thread's context if - * I passed the new socket "blindly" to the single NI that needed an - * acceptor. If so, blind_ni != NULL... */ - - LASSERT (sizeof(cr) <= 16); /* not too big for the stack */ - - rc = libcfs_sock_getaddr(sock, 1, &peer_ip, &peer_port); - LASSERT (rc == 0); /* we succeeded before */ - - if (!lnet_accept_magic(magic, LNET_PROTO_ACCEPTOR_MAGIC)) { - - if (lnet_accept_magic(magic, LNET_PROTO_MAGIC)) { - /* future version compatibility! - * When LNET unifies protocols over all LNDs, the first - * thing sent will be a version query. I send back - * LNET_PROTO_ACCEPTOR_MAGIC to tell her I'm "old" */ - - memset (&cr, 0, sizeof(cr)); - cr.acr_magic = LNET_PROTO_ACCEPTOR_MAGIC; - cr.acr_version = LNET_PROTO_ACCEPTOR_VERSION; - rc = libcfs_sock_write(sock, &cr, sizeof(cr), - accept_timeout); - - if (rc != 0) - CERROR("Error sending magic+version in response" - "to LNET magic from %u.%u.%u.%u: %d\n", - HIPQUAD(peer_ip), rc); - return -EPROTO; - } - - if (magic == le32_to_cpu(LNET_PROTO_TCP_MAGIC)) - str = "'old' socknal/tcpnal"; - else if (lnet_accept_magic(magic, LNET_PROTO_RA_MAGIC)) - str = "'old' ranal"; - else if (lnet_accept_magic(magic, LNET_PROTO_OPENIB_MAGIC)) - str = "'old' openibnal"; - else - str = "unrecognised"; - - LCONSOLE_ERROR_MSG(0x11f, "Refusing connection from %u.%u.%u.%u" - " magic %08x: %s acceptor protocol\n", - HIPQUAD(peer_ip), magic, str); - return -EPROTO; - } - - flip = (magic != LNET_PROTO_ACCEPTOR_MAGIC); - - rc = libcfs_sock_read(sock, &cr.acr_version, - sizeof(cr.acr_version), - accept_timeout); - if (rc != 0) { - CERROR("Error %d reading connection request version from " - "%u.%u.%u.%u\n", rc, HIPQUAD(peer_ip)); - return -EIO; - } - - if (flip) - __swab32s(&cr.acr_version); - - if (cr.acr_version != LNET_PROTO_ACCEPTOR_VERSION) { - /* future version compatibility! - * An acceptor-specific protocol rev will first send a version - * query. I send back my current version to tell her I'm - * "old". */ - int peer_version = cr.acr_version; - - memset (&cr, 0, sizeof(cr)); - cr.acr_magic = LNET_PROTO_ACCEPTOR_MAGIC; - cr.acr_version = LNET_PROTO_ACCEPTOR_VERSION; - - rc = libcfs_sock_write(sock, &cr, sizeof(cr), - accept_timeout); - - if (rc != 0) - CERROR("Error sending magic+version in response" - "to version %d from %u.%u.%u.%u: %d\n", - peer_version, HIPQUAD(peer_ip), rc); - return -EPROTO; - } - - rc = libcfs_sock_read(sock, &cr.acr_nid, - sizeof(cr) - - offsetof(lnet_acceptor_connreq_t, acr_nid), - accept_timeout); - if (rc != 0) { - CERROR("Error %d reading connection request from " - "%u.%u.%u.%u\n", rc, HIPQUAD(peer_ip)); - return -EIO; - } - - if (flip) - __swab64s(&cr.acr_nid); - - ni = lnet_net2ni(LNET_NIDNET(cr.acr_nid)); - if (ni == NULL || /* no matching net */ - ni->ni_nid != cr.acr_nid) { /* right NET, wrong NID! */ - if (ni != NULL) - lnet_ni_decref(ni); - LCONSOLE_ERROR_MSG(0x120, "Refusing connection from %u.%u.%u.%u" - " for %s: No matching NI\n", - HIPQUAD(peer_ip), libcfs_nid2str(cr.acr_nid)); - return -EPERM; - } - - if (ni->ni_lnd->lnd_accept == NULL) { - /* This catches a request for the loopback LND */ - lnet_ni_decref(ni); - LCONSOLE_ERROR_MSG(0x121, "Refusing connection from %u.%u.%u.%u" - " for %s: NI doesn not accept IP connections\n", - HIPQUAD(peer_ip), libcfs_nid2str(cr.acr_nid)); - return -EPERM; - } - - CDEBUG(D_NET, "Accept %s from %u.%u.%u.%u%s\n", - libcfs_nid2str(cr.acr_nid), HIPQUAD(peer_ip), - blind_ni == NULL ? "" : " (blind)"); - - if (blind_ni == NULL) { - /* called by the acceptor: call into the requested NI... */ - rc = ni->ni_lnd->lnd_accept(ni, sock); - } else { - /* portals_compatible set and the (only) NI called me to verify - * and skip the connection request... */ - LASSERT (the_lnet.ln_ptlcompat != 0); - LASSERT (ni == blind_ni); - rc = 0; - } - - lnet_ni_decref(ni); - return rc; + /* Ensure pta_odata has actually been set before calling it */ + rmb(); +#ifdef HAVE_SK_DATA_READY_ONE_ARG + lnet_acceptor_state.pta_odata(sk); +#else + lnet_acceptor_state.pta_odata(sk, 0); +#endif + + atomic_set(&lnet_acceptor_state.pta_ready, 1); + wake_up(&lnet_acceptor_state.pta_waitq); } -EXPORT_SYMBOL(lnet_accept); - -int + +static int lnet_acceptor(void *arg) { - char name[16]; - cfs_socket_t *newsock; - int rc; - int n_acceptor_nis; - __u32 magic; - __u32 peer_ip; - int peer_port; - lnet_ni_t *blind_ni = NULL; - int secure = (int)((unsigned long)arg); - - LASSERT (lnet_acceptor_state.pta_sock == NULL); - - if (the_lnet.ln_ptlcompat != 0) { - /* When portals_compatibility is enabled, peers may connect - * without sending an acceptor connection request. There is no - * ambiguity about which network the peer wants to connect to - * since there can only be 1 network, so I pass connections - * "blindly" to it. */ - n_acceptor_nis = lnet_count_acceptor_nis(&blind_ni); - LASSERT (n_acceptor_nis == 1); - LASSERT (blind_ni != NULL); - } - - snprintf(name, sizeof(name), "acceptor_%03d", accept_port); - cfs_daemonize(name); - cfs_block_allsigs(); - - rc = libcfs_sock_listen(&lnet_acceptor_state.pta_sock, - 0, accept_port, accept_backlog); - if (rc != 0) { - if (rc == -EADDRINUSE) - LCONSOLE_ERROR_MSG(0x122, "Can't start acceptor on port" - " %d: port already in use\n", - accept_port); - else - LCONSOLE_ERROR_MSG(0x123, "Can't start acceptor on port " - "%d: unexpected error %d\n", - accept_port, rc); + struct socket *newsock; + int rc; + __u32 magic; + __u32 peer_ip; + int peer_port; + int secure = (int)((uintptr_t)arg); + + LASSERT(lnet_acceptor_state.pta_sock == NULL); + + lnet_acceptor_state.pta_sock = + lnet_sock_listen(0, accept_port, accept_backlog, + lnet_acceptor_state.pta_ns); + if (IS_ERR(lnet_acceptor_state.pta_sock)) { + rc = PTR_ERR(lnet_acceptor_state.pta_sock); + if (rc == -EADDRINUSE) + LCONSOLE_ERROR_MSG(0x122, "Can't start acceptor on port" + " %d: port already in use\n", + accept_port); + else + LCONSOLE_ERROR_MSG(0x123, "Can't start acceptor on port " + "%d: unexpected error %d\n", + accept_port, rc); lnet_acceptor_state.pta_sock = NULL; - } else { - LCONSOLE(0, "Accept %s, port %d%s\n", - accept, accept_port, - blind_ni == NULL ? "" : " (proto compatible)"); - } - + } else { + rc = 0; + LCONSOLE(0, "Accept %s, port %d\n", accept_type, accept_port); + init_waitqueue_head(&lnet_acceptor_state.pta_waitq); + lnet_acceptor_state.pta_odata = + lnet_acceptor_state.pta_sock->sk->sk_data_ready; + /* ensure pta_odata gets set before there is any chance of + * lnet_accept_ready() trying to read it. + */ + wmb(); + lnet_acceptor_state.pta_sock->sk->sk_data_ready = + lnet_acceptor_ready; + atomic_set(&lnet_acceptor_state.pta_ready, 1); + } + /* set init status and unblock parent */ lnet_acceptor_state.pta_shutdown = rc; - mutex_up(&lnet_acceptor_state.pta_signal); - + complete(&lnet_acceptor_state.pta_signal); + if (rc != 0) return rc; - while (lnet_acceptor_state.pta_shutdown == 0) { - - rc = libcfs_sock_accept(&newsock, lnet_acceptor_state.pta_sock); + while (!lnet_acceptor_state.pta_shutdown) { + + wait_event_idle(lnet_acceptor_state.pta_waitq, + lnet_acceptor_state.pta_shutdown || + atomic_read(&lnet_acceptor_state.pta_ready)); + if (!atomic_read(&lnet_acceptor_state.pta_ready)) + continue; + atomic_set(&lnet_acceptor_state.pta_ready, 0); + rc = kernel_accept(lnet_acceptor_state.pta_sock, &newsock, + SOCK_NONBLOCK); if (rc != 0) { if (rc != -EAGAIN) { CWARN("Accept error %d: pausing...\n", rc); - cfs_pause(cfs_time_seconds(1)); + schedule_timeout_uninterruptible( + cfs_time_seconds(1)); } continue; } - rc = libcfs_sock_getaddr(newsock, 1, &peer_ip, &peer_port); + /* make sure we call lnet_sock_accept() again, until it fails */ + atomic_set(&lnet_acceptor_state.pta_ready, 1); + + rc = lnet_sock_getaddr(newsock, true, &peer_ip, &peer_port); if (rc != 0) { CERROR("Can't determine new connection's address\n"); goto failed; } - if (secure && peer_port > LNET_ACCEPTOR_MAX_RESERVED_PORT) { - CERROR("Refusing connection from %u.%u.%u.%u: " - "insecure port %d\n", - HIPQUAD(peer_ip), peer_port); - goto failed; - } - - if (blind_ni != NULL) { - rc = blind_ni->ni_lnd->lnd_accept(blind_ni, newsock); - if (rc != 0) { - CERROR("NI %s refused 'blind' connection from " - "%u.%u.%u.%u\n", - libcfs_nid2str(blind_ni->ni_nid), - HIPQUAD(peer_ip)); - goto failed; - } - continue; - } - - rc = libcfs_sock_read(newsock, &magic, sizeof(magic), + if (secure && peer_port > LNET_ACCEPTOR_MAX_RESERVED_PORT) { + CERROR("Refusing connection from %pI4h: " + "insecure port %d\n", &peer_ip, peer_port); + goto failed; + } + + rc = lnet_sock_read(newsock, &magic, sizeof(magic), accept_timeout); if (rc != 0) { - CERROR("Error %d reading connection request from " - "%u.%u.%u.%u\n", rc, HIPQUAD(peer_ip)); + CERROR("Error %d reading connection request from " + "%pI4h\n", rc, &peer_ip); goto failed; } - rc = lnet_accept(NULL, newsock, magic); - if (rc != 0) - goto failed; - - continue; - - failed: - libcfs_sock_release(newsock); + rc = lnet_accept(newsock, magic); + if (rc != 0) + goto failed; + + continue; + +failed: + sock_release(newsock); } - - libcfs_sock_release(lnet_acceptor_state.pta_sock); - lnet_acceptor_state.pta_sock = NULL; - if (blind_ni != NULL) - lnet_ni_decref(blind_ni); + lnet_acceptor_state.pta_sock->sk->sk_data_ready = + lnet_acceptor_state.pta_odata; + sock_release(lnet_acceptor_state.pta_sock); + lnet_acceptor_state.pta_sock = NULL; + + CDEBUG(D_NET, "Acceptor stopping\n"); - LCONSOLE(0,"Acceptor stopping\n"); - /* unblock lnet_acceptor_stop() */ - mutex_up(&lnet_acceptor_state.pta_signal); + complete(&lnet_acceptor_state.pta_signal); return 0; } -int -lnet_acceptor_start(void) +static inline int +accept2secure(const char *acc, long *sec) { - long pid; - long secure; - - LASSERT (lnet_acceptor_state.pta_sock == NULL); - init_mutex_locked(&lnet_acceptor_state.pta_signal); - - if (!strcmp(accept, "secure")) { - secure = 1; - } else if (!strcmp(accept, "all")) { - secure = 0; - } else if (!strcmp(accept, "none")) { - return 0; - } else { - LCONSOLE_ERROR_MSG(0x124, "Can't parse 'accept=\"%s\"'\n", - accept); - return -EINVAL; - } - - if (lnet_count_acceptor_nis(NULL) == 0) /* not required */ + if (!strcmp(acc, "secure")) { + *sec = 1; + return 1; + } else if (!strcmp(acc, "all")) { + *sec = 0; + return 1; + } else if (!strcmp(acc, "none")) { return 0; - - pid = cfs_kernel_thread(lnet_acceptor, (void *)secure, 0); - if (pid < 0) { - CERROR("Can't start acceptor thread: %ld\n", pid); - return -ESRCH; + } else { + LCONSOLE_ERROR_MSG(0x124, "Can't parse 'accept=\"%s\"'\n", + acc); + return -EINVAL; } - - mutex_down(&lnet_acceptor_state.pta_signal); /* wait for acceptor to startup */ - - if (lnet_acceptor_state.pta_shutdown == 0) { - /* started OK */ - LASSERT (lnet_acceptor_state.pta_sock != NULL); - return 0; - } - - LASSERT (lnet_acceptor_state.pta_sock == NULL); - return -ENETDOWN; } -void -lnet_acceptor_stop(void) -{ - if (lnet_acceptor_state.pta_sock == NULL) /* not running */ - return; - - lnet_acceptor_state.pta_shutdown = 1; - libcfs_sock_abort_accept(lnet_acceptor_state.pta_sock); - - /* block until acceptor signals exit */ - mutex_down(&lnet_acceptor_state.pta_signal); -} - -#else /* __KERNEL__ */ -#ifdef HAVE_LIBPTHREAD - -static char *accept_type; -static int accept_port = 988; -static int accept_backlog; -static int accept_timeout; - -struct { - int pta_shutdown; - int pta_sock; - struct cfs_completion pta_completion; -} lnet_acceptor_state; - int -lnet_acceptor_port(void) -{ - return accept_port; -} - -int -lnet_parse_int_tunable(int *value, char *name, int dflt) -{ - char *env = getenv(name); - char *end; - - if (env == NULL) { - *value = dflt; - return 0; - } - - *value = strtoull(env, &end, 0); - if (*end == 0) - return 0; - - CERROR("Can't parse tunable %s=%s\n", name, env); - return -EINVAL; -} - -int -lnet_parse_string_tunable(char **value, char *name, char *dflt) -{ - char *env = getenv(name); - - if (env == NULL) - *value = dflt; - else - *value = env; - - return 0; -} - -int -lnet_get_tunables() +lnet_acceptor_start(void) { - int rc; - rc = lnet_parse_string_tunable(&accept_type, "LNET_ACCEPT", "secure"); - - if (rc != 0) - return rc; + struct task_struct *task; + int rc; + long rc2; + long secure; - rc = lnet_parse_int_tunable(&accept_port, "LNET_ACCEPT_PORT", 988); - - if (rc != 0) - return rc; - - rc = lnet_parse_int_tunable(&accept_backlog, "LNET_ACCEPT_BACKLOG", 127); - - if (rc != 0) - return rc; - - rc = lnet_parse_int_tunable(&accept_timeout, "LNET_ACCEPT_TIMEOUT", 5); + /* if acceptor is already running return immediately */ + if (!lnet_acceptor_state.pta_shutdown) + return 0; - if (rc != 0) - return rc; + LASSERT(lnet_acceptor_state.pta_sock == NULL); - CDEBUG(D_NET, "accept_type = %s\n", accept_type); - CDEBUG(D_NET, "accept_port = %d\n", accept_port); - CDEBUG(D_NET, "accept_backlog = %d\n", accept_backlog); - CDEBUG(D_NET, "accept_timeout = %d\n", accept_timeout); - return 0; -} + init_completion(&lnet_acceptor_state.pta_signal); + rc = accept2secure(accept_type, &secure); + if (rc <= 0) + return rc; -static inline int -lnet_accept_magic(__u32 magic, __u32 constant) -{ - return (magic == constant || - magic == __swab32(constant)); -} + if (lnet_count_acceptor_nets() == 0) /* not required */ + return 0; + if (current->nsproxy && current->nsproxy->net_ns) + lnet_acceptor_state.pta_ns = current->nsproxy->net_ns; + else + lnet_acceptor_state.pta_ns = &init_net; + task = kthread_run(lnet_acceptor, (void *)(uintptr_t)secure, + "acceptor_%03ld", secure); + if (IS_ERR(task)) { + rc2 = PTR_ERR(task); + CERROR("Can't start acceptor thread: %ld\n", rc2); + return -ESRCH; + } -/* user-land lnet_accept() isn't used by any LND's directly. So, we don't - * do it visible outside acceptor.c and we can change its prototype - * freely */ -static int -lnet_accept(int sock, __u32 magic, __u32 peer_ip, int peer_port) -{ - int rc, flip; - lnet_acceptor_connreq_t cr; - lnet_ni_t *ni; - - if (!lnet_accept_magic(magic, LNET_PROTO_ACCEPTOR_MAGIC)) { - LCONSOLE_ERROR("Refusing connection from %u.%u.%u.%u magic %08x: " - "unsupported acceptor protocol\n", - HIPQUAD(peer_ip), magic); - return -EPROTO; - } - - flip = (magic != LNET_PROTO_ACCEPTOR_MAGIC); - - rc = libcfs_sock_read(sock, &cr.acr_version, - sizeof(cr.acr_version), - accept_timeout); - if (rc != 0) { - CERROR("Error %d reading connection request version from " - "%u.%u.%u.%u\n", rc, HIPQUAD(peer_ip)); - return -EIO; - } - - if (flip) - __swab32s(&cr.acr_version); - - if (cr.acr_version != LNET_PROTO_ACCEPTOR_VERSION) - return -EPROTO; - - rc = libcfs_sock_read(sock, &cr.acr_nid, - sizeof(cr) - - offsetof(lnet_acceptor_connreq_t, acr_nid), - accept_timeout); - if (rc != 0) { - CERROR("Error %d reading connection request from " - "%u.%u.%u.%u\n", rc, HIPQUAD(peer_ip)); - return -EIO; - } - - if (flip) - __swab64s(&cr.acr_nid); - - ni = lnet_net2ni(LNET_NIDNET(cr.acr_nid)); - - if (ni == NULL || /* no matching net */ - ni->ni_nid != cr.acr_nid) { /* right NET, wrong NID! */ - if (ni != NULL) - lnet_ni_decref(ni); - LCONSOLE_ERROR("Refusing connection from %u.%u.%u.%u for %s: " - " No matching NI\n", - HIPQUAD(peer_ip), libcfs_nid2str(cr.acr_nid)); - return -EPERM; - } - - if (ni->ni_lnd->lnd_accept == NULL) { - lnet_ni_decref(ni); - LCONSOLE_ERROR("Refusing connection from %u.%u.%u.%u for %s: " - " NI doesn not accept IP connections\n", - HIPQUAD(peer_ip), libcfs_nid2str(cr.acr_nid)); - return -EPERM; - } - - CDEBUG(D_NET, "Accept %s from %u.%u.%u.%u\n", - libcfs_nid2str(cr.acr_nid), HIPQUAD(peer_ip)); - - rc = ni->ni_lnd->lnd_accept(ni, sock); - - lnet_ni_decref(ni); - return rc; -} + /* wait for acceptor to startup */ + wait_for_completion(&lnet_acceptor_state.pta_signal); -int -lnet_acceptor(void *arg) -{ - char name[16]; - int secure = (int)((unsigned long)arg); - int rc; - int newsock; - __u32 peer_ip; - int peer_port; - __u32 magic; - - snprintf(name, sizeof(name), "acceptor_%03d", accept_port); - cfs_daemonize(name); - cfs_block_allsigs(); - - rc = libcfs_sock_listen(&lnet_acceptor_state.pta_sock, - 0, accept_port, accept_backlog); - if (rc != 0) { - if (rc == -EADDRINUSE) - LCONSOLE_ERROR("Can't start acceptor on port %d: " - "port already in use\n", - accept_port); - else - LCONSOLE_ERROR("Can't start acceptor on port %d: " - "unexpected error %d\n", - accept_port, rc); - - } else { - LCONSOLE(0, "Accept %s, port %d\n", accept_type, accept_port); - } - - /* set init status and unblock parent */ - lnet_acceptor_state.pta_shutdown = rc; - cfs_complete(&lnet_acceptor_state.pta_completion); - - if (rc != 0) - return rc; - - while (lnet_acceptor_state.pta_shutdown == 0) { - - rc = libcfs_sock_accept(&newsock, lnet_acceptor_state.pta_sock, - &peer_ip, &peer_port); - if (rc != 0) - continue; - - /* maybe we're waken up with libcfs_sock_abort_accept() */ - if ( lnet_acceptor_state.pta_shutdown ) { - close(newsock); - break; - } - - if (secure && peer_port > LNET_ACCEPTOR_MAX_RESERVED_PORT) { - CERROR("Refusing connection from %u.%u.%u.%u: " - "insecure port %d\n", - HIPQUAD(peer_ip), peer_port); - goto failed; - } - - rc = libcfs_sock_read(newsock, &magic, sizeof(magic), - accept_timeout); - if (rc != 0) { - CERROR("Error %d reading connection request from " - "%u.%u.%u.%u\n", rc, HIPQUAD(peer_ip)); - goto failed; - } - - rc = lnet_accept(newsock, magic, peer_ip, peer_port); - if (rc != 0) - goto failed; - - continue; - - failed: - close(newsock); - } - - close(lnet_acceptor_state.pta_sock); - LCONSOLE(0,"Acceptor stopping\n"); - - /* unblock lnet_acceptor_stop() */ - cfs_complete(&lnet_acceptor_state.pta_completion); - - return 0; -} + if (!lnet_acceptor_state.pta_shutdown) { + /* started OK */ + LASSERT(lnet_acceptor_state.pta_sock != NULL); + return 0; + } -static int skip_waiting_for_completion; + LASSERT(lnet_acceptor_state.pta_sock == NULL); -int -lnet_acceptor_start(void) -{ - long secure; - int rc; - - /* Do nothing if we're liblustre clients */ - if (the_lnet.ln_pid & LNET_PID_USERFLAG) - return 0; - - rc = lnet_get_tunables(); - if ( rc !=0 ) - return rc; - - cfs_init_completion(&lnet_acceptor_state.pta_completion); - - if (!strcmp(accept_type, "secure")) { - secure = 1; - } else if (!strcmp(accept_type, "all")) { - secure = 0; - } else if (!strcmp(accept_type, "none")) { - return 0; - } else { - LCONSOLE_ERROR ("Can't parse 'accept_type=\"%s\"'\n", accept_type); - cfs_fini_completion(&lnet_acceptor_state.pta_completion); - return -EINVAL; - } - - if (lnet_count_acceptor_nis(NULL) == 0) { /* not required */ - skip_waiting_for_completion = 1; - return 0; - } - - rc = cfs_create_thread(lnet_acceptor, (void *)secure); - if (rc) { - CERROR("Can't start acceptor thread: %d\n", rc); - cfs_fini_completion(&lnet_acceptor_state.pta_completion); - return rc; - } - - /* wait for acceptor to startup */ - cfs_wait_for_completion(&lnet_acceptor_state.pta_completion); - - if (lnet_acceptor_state.pta_shutdown == 0) - return 0; - - cfs_fini_completion(&lnet_acceptor_state.pta_completion); - return -ENETDOWN; + return -ENETDOWN; } void lnet_acceptor_stop(void) { - /* Do nothing if we're liblustre clients */ - if (the_lnet.ln_pid & LNET_PID_USERFLAG) - return; - - if ( !skip_waiting_for_completion ) { - lnet_acceptor_state.pta_shutdown = 1; - libcfs_sock_abort_accept(accept_port); - - /* block until acceptor signals exit */ - cfs_wait_for_completion(&lnet_acceptor_state.pta_completion); - } - - cfs_fini_completion(&lnet_acceptor_state.pta_completion); -} -#else -int -lnet_acceptor_start(void) -{ - return 0; -} + if (lnet_acceptor_state.pta_shutdown) /* not running */ + return; -void -lnet_acceptor_stop(void) -{ + lnet_acceptor_state.pta_shutdown = 1; + wake_up(&lnet_acceptor_state.pta_waitq); + + /* block until acceptor signals exit */ + wait_for_completion(&lnet_acceptor_state.pta_signal); } -#endif /* !HAVE_LIBPTHREAD */ -#endif /* !__KERNEL__ */