On Mon, 26 Jan 2009 18:17:38 -0800 Andy Grover <[email protected]> wrote:
> Implement the RDS (Reliable Datagram Sockets) interface. > > Signed-off-by: Andy Grover <[email protected]> > --- > drivers/infiniband/ulp/rds/af_rds.c | 677 > +++++++++++++++++++++++++++++++++++ > drivers/infiniband/ulp/rds/bind.c | 202 +++++++++++ > 2 files changed, 879 insertions(+), 0 deletions(-) > create mode 100644 drivers/infiniband/ulp/rds/af_rds.c > create mode 100644 drivers/infiniband/ulp/rds/bind.c > > diff --git a/drivers/infiniband/ulp/rds/af_rds.c > b/drivers/infiniband/ulp/rds/af_rds.c > new file mode 100644 > index 0000000..7158438 > --- /dev/null > +++ b/drivers/infiniband/ulp/rds/af_rds.c > @@ -0,0 +1,677 @@ > +/* > + * 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" > + > +static int enable_rdma = 1; > + > +module_param(enable_rdma, int, 0444); > +MODULE_PARM_DESC(enable_rdma, " Enable RDMA operations support"); Module parameter is a cop-out for not doing it right. > +/* this is just used for stats gathering :/ */ Then I would think a high speed protocol would use per-cpu and/or rcu. > +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) > +{ > +#ifdef KERNEL_HAS_CORE_CALLING_DEV_IOCTL > + return -ENOIOCTLCMD; > +#endif /* KERNEL_HAS_CORE_CALLING_DEV_IOCTL */ > +#ifndef KERNEL_HAS_CORE_CALLING_DEV_IOCTL > + return dev_ioctl(cmd, (void __user *)arg); > +#endif /* KERNEL_HAS_CORE_CALLING_DEV_IOCTL */ > +} > + > +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: > + if (enable_rdma) > + ret = rds_get_mr(rs, optval, optlen); > + else > + ret = -EOPNOTSUPP; > + break; > + case RDS_FREE_MR: > + if (enable_rdma) > + ret = rds_free_mr(rs, optval, optlen); > + else > + ret = -EOPNOTSUPP; > + 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; > +} > + > +#ifdef KERNEL_HAS_PROTO_REGISTER > +static struct proto rds_proto = { > + .name = "RDS", > + .owner = THIS_MODULE, > + .obj_size = sizeof(struct rds_sock), > +}; > +#endif /* KERNEL_HAS_PROTO_REGISTER */ > + > +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, > +}; > + > +#ifndef KERNEL_HAS_PROTO_REGISTER > +static struct sock *sk_alloc_compat(int pf, gfp_t gfp, struct proto *prot, > + int zero_it) > +{ > + struct rds_sock *rs; > + > + sk = sk_alloc(pf, gfp, prot, zero_it); > + if (sk == NULL) > + return NULL; > + > + rs = kcalloc(1, sizeof(struct rds_sock), GFP_ATOMIC); > + if (rs == NULL) { > + sk_free(sk); > + return NULL; > + } > + > + /* sock_def_destruct frees this for us */ > + sk->sk_protinfo = rs; > + rs->rs_sk = sk; > + > + return sk; > +} > + > +#undef sk_alloc > +#define sk_alloc sk_alloc_compat > +#endif /* KERNEL_HAS_PROTO_REGISTER */ > + > +static int __rds_create(struct socket *sock, struct sock *sk, int protocol) > +{ > + unsigned long flags; > + struct rds_sock *rs; > + > + sock_init_data(sock, sk); > +#ifndef KERNEL_HAS_PROTO_REGISTER > + /* Can this be moved to sk_alloc_compat? */ > + sk_set_owner(sk, THIS_MODULE); > +#endif /* KERNEL_HAS_PROTO_REGISTER */ > + 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; > +} > + > +#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 24) > +static int rds_create(struct socket *sock, int protocol) > +{ > + struct sock *sk; > + > + if (sock->type != SOCK_SEQPACKET || protocol) > + return -ESOCKTNOSUPPORT; > + > + sk = sk_alloc(AF_RDS, GFP_ATOMIC, &rds_proto, 1); > + if (sk == NULL) > + return -ENOMEM; > + > + return __rds_create(sock, sk, protocol); > +} > +#else > +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); > +} > +#endif > + > +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); > +} > + > +/* > + * The order is important here. > + * > + * rds_trans_stop_listening() is called before conn_exit so new connections > + * don't hit while existing ones are being torn down. > + * > + * rds_conn_exit() is before rds_trans_exit() as rds_conn_exit() calls into > the > + * transports to free connections and incoming fragments as they're torn > down. > + */ > +static void __exit rds_exit(void) > +{ > + rds_ib_exit(); > + sock_unregister(rds_family_ops.family); > +#ifdef KERNEL_HAS_PROTO_REGISTER > + proto_unregister(&rds_proto); > +#endif /* KERNEL_HAS_PROTO_REGISTER */ > + rds_trans_stop_listening(); > + 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; > + > +#ifndef KERNEL_HAS_NOT_DEFINED > + /* the strange ifdef above has scripts/makepatch.sh strip this out */ > +#if PF_RDS == 21 > + printk(KERN_ERR "!!! This build of RDS is using PF 21 which is not " > + "reserved\n"); > + printk(KERN_ERR "!!! This is only suitable for testing, DO NOT " > + "RELEASE THIS.\n"); > + printk(KERN_ERR "!!! No, seriously.\n"); > +#endif > +#endif /* KERNEL_HAS_NOT_DEFINED */ You don't want this ifdef crap in upstream > + > + 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; > +#ifdef KERNEL_HAS_PROTO_REGISTER > + ret = proto_register(&rds_proto, 1); > + if (ret) > + goto out_stats; > +#endif /* KERNEL_HAS_PROTO_REGISTER */ > + 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); > + > + ret = rds_ib_init(); > + if (ret) > + goto out_sock; > + goto out; > + > +out_sock: > + sock_unregister(rds_family_ops.family); > +out_proto: > +#ifdef KERNEL_HAS_PROTO_REGISTER > + proto_unregister(&rds_proto); > +out_stats: > +#endif /* KERNEL_HAS_PROTO_REGISTER */ > + 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 "July 28, 2008" > + > +MODULE_AUTHOR("Zach Brown"); > +MODULE_AUTHOR("Olaf Kirch"); > +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); _______________________________________________ general mailing list [email protected] http://lists.openfabrics.org/cgi-bin/mailman/listinfo/general To unsubscribe, please visit http://openib.org/mailman/listinfo/openib-general
