diff options
Diffstat (limited to 'net/rds/af_rds.c')
| -rw-r--r-- | net/rds/af_rds.c | 586 |
1 files changed, 586 insertions, 0 deletions
diff --git a/net/rds/af_rds.c b/net/rds/af_rds.c new file mode 100644 index 000000000000..20cf16fc572f --- /dev/null +++ b/net/rds/af_rds.c @@ -0,0 +1,586 @@ +/* + * 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> +#include <linux/in.h> +#include <linux/poll.h> +#include <linux/version.h> +#include <net/sock.h> + +#include "rds.h" +#include "rdma.h" +#include "rdma_transport.h" + +/* 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; + unsigned long flags; + + if (sk == NULL) + 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); + rds_remove_bound(rs); + rds_send_drop_to(rs, NULL); + rds_rdma_drop_keys(rs); + rds_notify_queue_get(rs, NULL); + + spin_lock_irqsave(&rds_sock_lock, flags); + list_del_init(&rs->rs_item); + rds_sock_count--; + spin_unlock_irqrestore(&rds_sock_lock, flags); + + 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; + + poll_wait(file, sk->sk_sleep, wait); + + poll_wait(file, &rds_poll_waitq, wait); + + 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); + } + if (!list_empty(&rs->rs_recv_queue) + || !list_empty(&rs->rs_notify_queue)) + mask |= (POLLIN | POLLRDNORM); + if (rs->rs_snd_bytes < rds_sk_sndbuf(rs)) + mask |= (POLLOUT | POLLWRNORM); + read_unlock_irqrestore(&rs->rs_recv_lock, flags); + + 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, + char __user *optval, int optlen) +{ + 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; + 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 + if (put_user(rs->rs_recverr, (int __user *) optval) + || put_user(sizeof(int), optlen)) + 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), +}; + +static struct proto_ops rds_proto_ops = { + .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) +{ + unsigned long flags; + 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; + + spin_lock_irqsave(&rds_sock_lock, flags); + list_add_tail(&rs->rs_item, &rds_sock_list); + rds_sock_count++; + spin_unlock_irqrestore(&rds_sock_lock, flags); + + return 0; +} + +static int rds_create(struct net *net, struct socket *sock, int protocol) +{ + 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)); +} + +static struct net_proto_family rds_family_ops = { + .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; + struct sock *sk; + struct rds_incoming *inc; + unsigned long flags; + unsigned int total = 0; + + len /= sizeof(struct rds_info_message); + + spin_lock_irqsave(&rds_sock_lock, flags); + + list_for_each_entry(rs, &rds_sock_list, rs_item) { + sk = rds_rs_to_sk(rs); + 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); + } + + spin_unlock_irqrestore(&rds_sock_lock, flags); + + 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; + unsigned long flags; + + len /= sizeof(struct rds_info_socket); + + spin_lock_irqsave(&rds_sock_lock, flags); + + 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); + + spin_unlock_irqrestore(&rds_sock_lock, flags); +} + +static void __exit rds_exit(void) +{ + rds_rdma_exit(); + 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); + +static int __init rds_init(void) +{ + 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); + + /* ib/iwarp transports currently compiled-in */ + ret = rds_rdma_init(); + if (ret) + goto out_sock; + goto out; + +out_sock: + sock_unregister(rds_family_ops.family); +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); |