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net/rds/af_rds.c
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/* * Copyright (c) 2006 Oracle. All rights reserved. * * This software is available to you under a choice of one of two * licenses. You may choose to be licensed under the terms of the GNU * General Public License (GPL) Version 2, available from the file * COPYING in the main directory of this source tree, or the * OpenIB.org BSD license below: * * Redistribution and use in source and binary forms, with or * without modification, are permitted provided that the following * conditions are met: * * - Redistributions of source code must retain the above * copyright notice, this list of conditions and the following * disclaimer. * * - Redistributions in binary form must reproduce the above * copyright notice, this list of conditions and the following * disclaimer in the documentation and/or other materials * provided with the distribution. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE * SOFTWARE. * */ #include <linux/module.h> #include <linux/errno.h> #include <linux/kernel.h> |
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#include <linux/gfp.h> |
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#include <linux/in.h> #include <linux/poll.h> |
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#include <net/sock.h> #include "rds.h" |
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char *rds_str_array(char **array, size_t elements, size_t index) { if ((index < elements) && array[index]) return array[index]; else return "unknown"; } EXPORT_SYMBOL(rds_str_array); |
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/* this is just used for stats gathering :/ */ static DEFINE_SPINLOCK(rds_sock_lock); static unsigned long rds_sock_count; static LIST_HEAD(rds_sock_list); DECLARE_WAIT_QUEUE_HEAD(rds_poll_waitq); /* * This is called as the final descriptor referencing this socket is closed. * We have to unbind the socket so that another socket can be bound to the * address it was using. * * We have to be careful about racing with the incoming path. sock_orphan() * sets SOCK_DEAD and we use that as an indicator to the rx path that new * messages shouldn't be queued. */ static int rds_release(struct socket *sock) { struct sock *sk = sock->sk; struct rds_sock *rs; |
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if (!sk) |
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goto out; rs = rds_sk_to_rs(sk); sock_orphan(sk); /* Note - rds_clear_recv_queue grabs rs_recv_lock, so * that ensures the recv path has completed messing * with the socket. */ rds_clear_recv_queue(rs); rds_cong_remove_socket(rs); |
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/* * the binding lookup hash uses rcu, we need to * make sure we sychronize_rcu before we free our * entry */ |
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rds_remove_bound(rs); |
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synchronize_rcu(); |
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rds_send_drop_to(rs, NULL); rds_rdma_drop_keys(rs); rds_notify_queue_get(rs, NULL); |
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spin_lock_bh(&rds_sock_lock); |
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list_del_init(&rs->rs_item); rds_sock_count--; |
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spin_unlock_bh(&rds_sock_lock); |
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rds_trans_put(rs->rs_transport); |
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sock->sk = NULL; sock_put(sk); out: return 0; } /* * Careful not to race with rds_release -> sock_orphan which clears sk_sleep. * _bh() isn't OK here, we're called from interrupt handlers. It's probably OK * to wake the waitqueue after sk_sleep is clear as we hold a sock ref, but * this seems more conservative. * NB - normally, one would use sk_callback_lock for this, but we can * get here from interrupts, whereas the network code grabs sk_callback_lock * with _lock_bh only - so relying on sk_callback_lock introduces livelocks. */ void rds_wake_sk_sleep(struct rds_sock *rs) { unsigned long flags; read_lock_irqsave(&rs->rs_recv_lock, flags); __rds_wake_sk_sleep(rds_rs_to_sk(rs)); read_unlock_irqrestore(&rs->rs_recv_lock, flags); } static int rds_getname(struct socket *sock, struct sockaddr *uaddr, int *uaddr_len, int peer) { struct sockaddr_in *sin = (struct sockaddr_in *)uaddr; struct rds_sock *rs = rds_sk_to_rs(sock->sk); memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); /* racey, don't care */ if (peer) { if (!rs->rs_conn_addr) return -ENOTCONN; sin->sin_port = rs->rs_conn_port; sin->sin_addr.s_addr = rs->rs_conn_addr; } else { sin->sin_port = rs->rs_bound_port; sin->sin_addr.s_addr = rs->rs_bound_addr; } sin->sin_family = AF_INET; *uaddr_len = sizeof(*sin); return 0; } /* * RDS' poll is without a doubt the least intuitive part of the interface, * as POLLIN and POLLOUT do not behave entirely as you would expect from * a network protocol. * * POLLIN is asserted if * - there is data on the receive queue. * - to signal that a previously congested destination may have become * uncongested * - A notification has been queued to the socket (this can be a congestion * update, or a RDMA completion). * * POLLOUT is asserted if there is room on the send queue. This does not mean * however, that the next sendmsg() call will succeed. If the application tries * to send to a congested destination, the system call may still fail (and * return ENOBUFS). */ static unsigned int rds_poll(struct file *file, struct socket *sock, poll_table *wait) { struct sock *sk = sock->sk; struct rds_sock *rs = rds_sk_to_rs(sk); unsigned int mask = 0; unsigned long flags; |
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poll_wait(file, sk_sleep(sk), wait); |
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if (rs->rs_seen_congestion) poll_wait(file, &rds_poll_waitq, wait); |
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read_lock_irqsave(&rs->rs_recv_lock, flags); if (!rs->rs_cong_monitor) { /* When a congestion map was updated, we signal POLLIN for * "historical" reasons. Applications can also poll for * WRBAND instead. */ if (rds_cong_updated_since(&rs->rs_cong_track)) mask |= (POLLIN | POLLRDNORM | POLLWRBAND); } else { spin_lock(&rs->rs_lock); if (rs->rs_cong_notify) mask |= (POLLIN | POLLRDNORM); spin_unlock(&rs->rs_lock); } |
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if (!list_empty(&rs->rs_recv_queue) || !list_empty(&rs->rs_notify_queue)) |
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mask |= (POLLIN | POLLRDNORM); if (rs->rs_snd_bytes < rds_sk_sndbuf(rs)) mask |= (POLLOUT | POLLWRNORM); read_unlock_irqrestore(&rs->rs_recv_lock, flags); |
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/* clear state any time we wake a seen-congested socket */ if (mask) rs->rs_seen_congestion = 0; |
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return mask; } static int rds_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) { return -ENOIOCTLCMD; } static int rds_cancel_sent_to(struct rds_sock *rs, char __user *optval, int len) { struct sockaddr_in sin; int ret = 0; /* racing with another thread binding seems ok here */ if (rs->rs_bound_addr == 0) { ret = -ENOTCONN; /* XXX not a great errno */ goto out; } if (len < sizeof(struct sockaddr_in)) { ret = -EINVAL; goto out; } if (copy_from_user(&sin, optval, sizeof(sin))) { ret = -EFAULT; goto out; } rds_send_drop_to(rs, &sin); out: return ret; } static int rds_set_bool_option(unsigned char *optvar, char __user *optval, int optlen) { int value; if (optlen < sizeof(int)) return -EINVAL; if (get_user(value, (int __user *) optval)) return -EFAULT; *optvar = !!value; return 0; } static int rds_cong_monitor(struct rds_sock *rs, char __user *optval, int optlen) { int ret; ret = rds_set_bool_option(&rs->rs_cong_monitor, optval, optlen); if (ret == 0) { if (rs->rs_cong_monitor) { rds_cong_add_socket(rs); } else { rds_cong_remove_socket(rs); rs->rs_cong_mask = 0; rs->rs_cong_notify = 0; } } return ret; } static int rds_setsockopt(struct socket *sock, int level, int optname, |
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char __user *optval, unsigned int optlen) |
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{ struct rds_sock *rs = rds_sk_to_rs(sock->sk); int ret; if (level != SOL_RDS) { ret = -ENOPROTOOPT; goto out; } switch (optname) { case RDS_CANCEL_SENT_TO: ret = rds_cancel_sent_to(rs, optval, optlen); break; case RDS_GET_MR: ret = rds_get_mr(rs, optval, optlen); break; |
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case RDS_GET_MR_FOR_DEST: ret = rds_get_mr_for_dest(rs, optval, optlen); break; |
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case RDS_FREE_MR: ret = rds_free_mr(rs, optval, optlen); break; case RDS_RECVERR: ret = rds_set_bool_option(&rs->rs_recverr, optval, optlen); break; case RDS_CONG_MONITOR: ret = rds_cong_monitor(rs, optval, optlen); break; default: ret = -ENOPROTOOPT; } out: return ret; } static int rds_getsockopt(struct socket *sock, int level, int optname, char __user *optval, int __user *optlen) { struct rds_sock *rs = rds_sk_to_rs(sock->sk); int ret = -ENOPROTOOPT, len; if (level != SOL_RDS) goto out; if (get_user(len, optlen)) { ret = -EFAULT; goto out; } switch (optname) { case RDS_INFO_FIRST ... RDS_INFO_LAST: ret = rds_info_getsockopt(sock, optname, optval, optlen); break; case RDS_RECVERR: if (len < sizeof(int)) ret = -EINVAL; else |
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if (put_user(rs->rs_recverr, (int __user *) optval) || put_user(sizeof(int), optlen)) |
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ret = -EFAULT; else ret = 0; break; default: break; } out: return ret; } static int rds_connect(struct socket *sock, struct sockaddr *uaddr, int addr_len, int flags) { struct sock *sk = sock->sk; struct sockaddr_in *sin = (struct sockaddr_in *)uaddr; struct rds_sock *rs = rds_sk_to_rs(sk); int ret = 0; lock_sock(sk); if (addr_len != sizeof(struct sockaddr_in)) { ret = -EINVAL; goto out; } if (sin->sin_family != AF_INET) { ret = -EAFNOSUPPORT; goto out; } if (sin->sin_addr.s_addr == htonl(INADDR_ANY)) { ret = -EDESTADDRREQ; goto out; } rs->rs_conn_addr = sin->sin_addr.s_addr; rs->rs_conn_port = sin->sin_port; out: release_sock(sk); return ret; } static struct proto rds_proto = { .name = "RDS", .owner = THIS_MODULE, .obj_size = sizeof(struct rds_sock), }; |
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static const struct proto_ops rds_proto_ops = { |
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.family = AF_RDS, .owner = THIS_MODULE, .release = rds_release, .bind = rds_bind, .connect = rds_connect, .socketpair = sock_no_socketpair, .accept = sock_no_accept, .getname = rds_getname, .poll = rds_poll, .ioctl = rds_ioctl, .listen = sock_no_listen, .shutdown = sock_no_shutdown, .setsockopt = rds_setsockopt, .getsockopt = rds_getsockopt, .sendmsg = rds_sendmsg, .recvmsg = rds_recvmsg, .mmap = sock_no_mmap, .sendpage = sock_no_sendpage, }; static int __rds_create(struct socket *sock, struct sock *sk, int protocol) { |
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struct rds_sock *rs; sock_init_data(sock, sk); sock->ops = &rds_proto_ops; sk->sk_protocol = protocol; rs = rds_sk_to_rs(sk); spin_lock_init(&rs->rs_lock); rwlock_init(&rs->rs_recv_lock); INIT_LIST_HEAD(&rs->rs_send_queue); INIT_LIST_HEAD(&rs->rs_recv_queue); INIT_LIST_HEAD(&rs->rs_notify_queue); INIT_LIST_HEAD(&rs->rs_cong_list); spin_lock_init(&rs->rs_rdma_lock); rs->rs_rdma_keys = RB_ROOT; |
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spin_lock_bh(&rds_sock_lock); |
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list_add_tail(&rs->rs_item, &rds_sock_list); rds_sock_count++; |
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spin_unlock_bh(&rds_sock_lock); |
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return 0; } |
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static int rds_create(struct net *net, struct socket *sock, int protocol, int kern) |
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{ struct sock *sk; if (sock->type != SOCK_SEQPACKET || protocol) return -ESOCKTNOSUPPORT; sk = sk_alloc(net, AF_RDS, GFP_ATOMIC, &rds_proto); if (!sk) return -ENOMEM; return __rds_create(sock, sk, protocol); } void rds_sock_addref(struct rds_sock *rs) { sock_hold(rds_rs_to_sk(rs)); } void rds_sock_put(struct rds_sock *rs) { sock_put(rds_rs_to_sk(rs)); } |
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static const struct net_proto_family rds_family_ops = { |
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.family = AF_RDS, .create = rds_create, .owner = THIS_MODULE, }; static void rds_sock_inc_info(struct socket *sock, unsigned int len, struct rds_info_iterator *iter, struct rds_info_lengths *lens) { struct rds_sock *rs; |
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struct rds_incoming *inc; |
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unsigned int total = 0; len /= sizeof(struct rds_info_message); |
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spin_lock_bh(&rds_sock_lock); |
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list_for_each_entry(rs, &rds_sock_list, rs_item) { |
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read_lock(&rs->rs_recv_lock); /* XXX too lazy to maintain counts.. */ list_for_each_entry(inc, &rs->rs_recv_queue, i_item) { total++; if (total <= len) rds_inc_info_copy(inc, iter, inc->i_saddr, rs->rs_bound_addr, 1); } read_unlock(&rs->rs_recv_lock); } |
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spin_unlock_bh(&rds_sock_lock); |
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lens->nr = total; lens->each = sizeof(struct rds_info_message); } static void rds_sock_info(struct socket *sock, unsigned int len, struct rds_info_iterator *iter, struct rds_info_lengths *lens) { struct rds_info_socket sinfo; struct rds_sock *rs; |
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len /= sizeof(struct rds_info_socket); |
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spin_lock_bh(&rds_sock_lock); |
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if (len < rds_sock_count) goto out; list_for_each_entry(rs, &rds_sock_list, rs_item) { sinfo.sndbuf = rds_sk_sndbuf(rs); sinfo.rcvbuf = rds_sk_rcvbuf(rs); sinfo.bound_addr = rs->rs_bound_addr; sinfo.connected_addr = rs->rs_conn_addr; sinfo.bound_port = rs->rs_bound_port; sinfo.connected_port = rs->rs_conn_port; sinfo.inum = sock_i_ino(rds_rs_to_sk(rs)); rds_info_copy(iter, &sinfo, sizeof(sinfo)); } out: lens->nr = rds_sock_count; lens->each = sizeof(struct rds_info_socket); |
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spin_unlock_bh(&rds_sock_lock); |
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} |
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static void rds_exit(void) |
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{ |
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sock_unregister(rds_family_ops.family); proto_unregister(&rds_proto); rds_conn_exit(); rds_cong_exit(); rds_sysctl_exit(); rds_threads_exit(); rds_stats_exit(); rds_page_exit(); rds_info_deregister_func(RDS_INFO_SOCKETS, rds_sock_info); rds_info_deregister_func(RDS_INFO_RECV_MESSAGES, rds_sock_inc_info); } module_exit(rds_exit); |
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static int rds_init(void) |
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{ int ret; ret = rds_conn_init(); if (ret) goto out; ret = rds_threads_init(); if (ret) goto out_conn; ret = rds_sysctl_init(); if (ret) goto out_threads; ret = rds_stats_init(); if (ret) goto out_sysctl; ret = proto_register(&rds_proto, 1); if (ret) goto out_stats; ret = sock_register(&rds_family_ops); if (ret) goto out_proto; rds_info_register_func(RDS_INFO_SOCKETS, rds_sock_info); rds_info_register_func(RDS_INFO_RECV_MESSAGES, rds_sock_inc_info); |
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goto out; |
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out_proto: proto_unregister(&rds_proto); out_stats: rds_stats_exit(); out_sysctl: rds_sysctl_exit(); out_threads: rds_threads_exit(); out_conn: rds_conn_exit(); rds_cong_exit(); rds_page_exit(); out: return ret; } module_init(rds_init); #define DRV_VERSION "4.0" #define DRV_RELDATE "Feb 12, 2009" MODULE_AUTHOR("Oracle Corporation <rds-devel@oss.oracle.com>"); MODULE_DESCRIPTION("RDS: Reliable Datagram Sockets" " v" DRV_VERSION " (" DRV_RELDATE ")"); MODULE_VERSION(DRV_VERSION); MODULE_LICENSE("Dual BSD/GPL"); MODULE_ALIAS_NETPROTO(PF_RDS); |