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![Joe Perches](/assets/img/avatar_default.png)
Not including net/atm/ Compiled tested x86 allyesconfig only Added a > 80 column line or two, which I ignored. Existing checkpatch plaints willfully, cheerfully ignored. Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: David S. Miller <davem@davemloft.net>
581 lines
14 KiB
C
581 lines
14 KiB
C
/*
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* Copyright (c) 2006 Oracle. All rights reserved.
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the
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* OpenIB.org BSD license below:
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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*/
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#include <linux/module.h>
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/in.h>
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#include <linux/poll.h>
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#include <net/sock.h>
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#include "rds.h"
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#include "rdma.h"
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/* this is just used for stats gathering :/ */
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static DEFINE_SPINLOCK(rds_sock_lock);
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static unsigned long rds_sock_count;
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static LIST_HEAD(rds_sock_list);
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DECLARE_WAIT_QUEUE_HEAD(rds_poll_waitq);
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/*
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* This is called as the final descriptor referencing this socket is closed.
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* We have to unbind the socket so that another socket can be bound to the
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* address it was using.
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*
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* We have to be careful about racing with the incoming path. sock_orphan()
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* sets SOCK_DEAD and we use that as an indicator to the rx path that new
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* messages shouldn't be queued.
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*/
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static int rds_release(struct socket *sock)
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{
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struct sock *sk = sock->sk;
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struct rds_sock *rs;
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unsigned long flags;
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if (sk == NULL)
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goto out;
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rs = rds_sk_to_rs(sk);
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sock_orphan(sk);
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/* Note - rds_clear_recv_queue grabs rs_recv_lock, so
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* that ensures the recv path has completed messing
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* with the socket. */
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rds_clear_recv_queue(rs);
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rds_cong_remove_socket(rs);
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rds_remove_bound(rs);
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rds_send_drop_to(rs, NULL);
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rds_rdma_drop_keys(rs);
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rds_notify_queue_get(rs, NULL);
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spin_lock_irqsave(&rds_sock_lock, flags);
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list_del_init(&rs->rs_item);
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rds_sock_count--;
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spin_unlock_irqrestore(&rds_sock_lock, flags);
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sock->sk = NULL;
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sock_put(sk);
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out:
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return 0;
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}
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/*
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* Careful not to race with rds_release -> sock_orphan which clears sk_sleep.
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* _bh() isn't OK here, we're called from interrupt handlers. It's probably OK
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* to wake the waitqueue after sk_sleep is clear as we hold a sock ref, but
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* this seems more conservative.
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* NB - normally, one would use sk_callback_lock for this, but we can
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* get here from interrupts, whereas the network code grabs sk_callback_lock
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* with _lock_bh only - so relying on sk_callback_lock introduces livelocks.
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*/
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void rds_wake_sk_sleep(struct rds_sock *rs)
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{
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unsigned long flags;
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read_lock_irqsave(&rs->rs_recv_lock, flags);
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__rds_wake_sk_sleep(rds_rs_to_sk(rs));
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read_unlock_irqrestore(&rs->rs_recv_lock, flags);
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}
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static int rds_getname(struct socket *sock, struct sockaddr *uaddr,
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int *uaddr_len, int peer)
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{
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struct sockaddr_in *sin = (struct sockaddr_in *)uaddr;
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struct rds_sock *rs = rds_sk_to_rs(sock->sk);
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memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
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/* racey, don't care */
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if (peer) {
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if (!rs->rs_conn_addr)
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return -ENOTCONN;
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sin->sin_port = rs->rs_conn_port;
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sin->sin_addr.s_addr = rs->rs_conn_addr;
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} else {
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sin->sin_port = rs->rs_bound_port;
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sin->sin_addr.s_addr = rs->rs_bound_addr;
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}
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sin->sin_family = AF_INET;
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*uaddr_len = sizeof(*sin);
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return 0;
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}
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/*
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* RDS' poll is without a doubt the least intuitive part of the interface,
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* as POLLIN and POLLOUT do not behave entirely as you would expect from
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* a network protocol.
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*
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* POLLIN is asserted if
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* - there is data on the receive queue.
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* - to signal that a previously congested destination may have become
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* uncongested
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* - A notification has been queued to the socket (this can be a congestion
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* update, or a RDMA completion).
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*
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* POLLOUT is asserted if there is room on the send queue. This does not mean
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* however, that the next sendmsg() call will succeed. If the application tries
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* to send to a congested destination, the system call may still fail (and
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* return ENOBUFS).
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*/
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static unsigned int rds_poll(struct file *file, struct socket *sock,
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poll_table *wait)
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{
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struct sock *sk = sock->sk;
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struct rds_sock *rs = rds_sk_to_rs(sk);
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unsigned int mask = 0;
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unsigned long flags;
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poll_wait(file, sk->sk_sleep, wait);
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poll_wait(file, &rds_poll_waitq, wait);
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read_lock_irqsave(&rs->rs_recv_lock, flags);
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if (!rs->rs_cong_monitor) {
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/* When a congestion map was updated, we signal POLLIN for
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* "historical" reasons. Applications can also poll for
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* WRBAND instead. */
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if (rds_cong_updated_since(&rs->rs_cong_track))
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mask |= (POLLIN | POLLRDNORM | POLLWRBAND);
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} else {
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spin_lock(&rs->rs_lock);
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if (rs->rs_cong_notify)
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mask |= (POLLIN | POLLRDNORM);
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spin_unlock(&rs->rs_lock);
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}
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if (!list_empty(&rs->rs_recv_queue) ||
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!list_empty(&rs->rs_notify_queue))
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mask |= (POLLIN | POLLRDNORM);
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if (rs->rs_snd_bytes < rds_sk_sndbuf(rs))
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mask |= (POLLOUT | POLLWRNORM);
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read_unlock_irqrestore(&rs->rs_recv_lock, flags);
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return mask;
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}
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static int rds_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
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{
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return -ENOIOCTLCMD;
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}
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static int rds_cancel_sent_to(struct rds_sock *rs, char __user *optval,
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int len)
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{
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struct sockaddr_in sin;
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int ret = 0;
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/* racing with another thread binding seems ok here */
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if (rs->rs_bound_addr == 0) {
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ret = -ENOTCONN; /* XXX not a great errno */
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goto out;
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}
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if (len < sizeof(struct sockaddr_in)) {
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ret = -EINVAL;
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goto out;
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}
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if (copy_from_user(&sin, optval, sizeof(sin))) {
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ret = -EFAULT;
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goto out;
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}
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rds_send_drop_to(rs, &sin);
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out:
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return ret;
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}
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static int rds_set_bool_option(unsigned char *optvar, char __user *optval,
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int optlen)
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{
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int value;
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if (optlen < sizeof(int))
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return -EINVAL;
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if (get_user(value, (int __user *) optval))
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return -EFAULT;
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*optvar = !!value;
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return 0;
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}
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static int rds_cong_monitor(struct rds_sock *rs, char __user *optval,
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int optlen)
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{
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int ret;
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ret = rds_set_bool_option(&rs->rs_cong_monitor, optval, optlen);
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if (ret == 0) {
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if (rs->rs_cong_monitor) {
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rds_cong_add_socket(rs);
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} else {
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rds_cong_remove_socket(rs);
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rs->rs_cong_mask = 0;
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rs->rs_cong_notify = 0;
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}
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}
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return ret;
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}
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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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{
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struct rds_sock *rs = rds_sk_to_rs(sock->sk);
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int ret;
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if (level != SOL_RDS) {
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ret = -ENOPROTOOPT;
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goto out;
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}
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switch (optname) {
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case RDS_CANCEL_SENT_TO:
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ret = rds_cancel_sent_to(rs, optval, optlen);
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break;
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case RDS_GET_MR:
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ret = rds_get_mr(rs, optval, optlen);
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break;
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case RDS_GET_MR_FOR_DEST:
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ret = rds_get_mr_for_dest(rs, optval, optlen);
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break;
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case RDS_FREE_MR:
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ret = rds_free_mr(rs, optval, optlen);
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break;
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case RDS_RECVERR:
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ret = rds_set_bool_option(&rs->rs_recverr, optval, optlen);
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break;
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case RDS_CONG_MONITOR:
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ret = rds_cong_monitor(rs, optval, optlen);
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break;
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default:
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ret = -ENOPROTOOPT;
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}
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out:
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return ret;
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}
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static int rds_getsockopt(struct socket *sock, int level, int optname,
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char __user *optval, int __user *optlen)
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{
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struct rds_sock *rs = rds_sk_to_rs(sock->sk);
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int ret = -ENOPROTOOPT, len;
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if (level != SOL_RDS)
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goto out;
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if (get_user(len, optlen)) {
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ret = -EFAULT;
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goto out;
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}
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switch (optname) {
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case RDS_INFO_FIRST ... RDS_INFO_LAST:
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ret = rds_info_getsockopt(sock, optname, optval,
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optlen);
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break;
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case RDS_RECVERR:
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if (len < sizeof(int))
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ret = -EINVAL;
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else
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if (put_user(rs->rs_recverr, (int __user *) optval) ||
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put_user(sizeof(int), optlen))
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ret = -EFAULT;
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else
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ret = 0;
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break;
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default:
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break;
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}
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out:
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return ret;
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}
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static int rds_connect(struct socket *sock, struct sockaddr *uaddr,
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int addr_len, int flags)
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{
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struct sock *sk = sock->sk;
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struct sockaddr_in *sin = (struct sockaddr_in *)uaddr;
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struct rds_sock *rs = rds_sk_to_rs(sk);
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int ret = 0;
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lock_sock(sk);
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if (addr_len != sizeof(struct sockaddr_in)) {
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ret = -EINVAL;
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goto out;
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}
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if (sin->sin_family != AF_INET) {
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ret = -EAFNOSUPPORT;
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goto out;
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}
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if (sin->sin_addr.s_addr == htonl(INADDR_ANY)) {
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ret = -EDESTADDRREQ;
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goto out;
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}
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rs->rs_conn_addr = sin->sin_addr.s_addr;
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rs->rs_conn_port = sin->sin_port;
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out:
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release_sock(sk);
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return ret;
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}
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static struct proto rds_proto = {
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.name = "RDS",
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.owner = THIS_MODULE,
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.obj_size = sizeof(struct rds_sock),
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};
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static const struct proto_ops rds_proto_ops = {
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.family = AF_RDS,
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.owner = THIS_MODULE,
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.release = rds_release,
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.bind = rds_bind,
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.connect = rds_connect,
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.socketpair = sock_no_socketpair,
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.accept = sock_no_accept,
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.getname = rds_getname,
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.poll = rds_poll,
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.ioctl = rds_ioctl,
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.listen = sock_no_listen,
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.shutdown = sock_no_shutdown,
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.setsockopt = rds_setsockopt,
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.getsockopt = rds_getsockopt,
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.sendmsg = rds_sendmsg,
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.recvmsg = rds_recvmsg,
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.mmap = sock_no_mmap,
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.sendpage = sock_no_sendpage,
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};
|
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|
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static int __rds_create(struct socket *sock, struct sock *sk, int protocol)
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{
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unsigned long flags;
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struct rds_sock *rs;
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|
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sock_init_data(sock, sk);
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sock->ops = &rds_proto_ops;
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sk->sk_protocol = protocol;
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|
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rs = rds_sk_to_rs(sk);
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spin_lock_init(&rs->rs_lock);
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rwlock_init(&rs->rs_recv_lock);
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INIT_LIST_HEAD(&rs->rs_send_queue);
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INIT_LIST_HEAD(&rs->rs_recv_queue);
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INIT_LIST_HEAD(&rs->rs_notify_queue);
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INIT_LIST_HEAD(&rs->rs_cong_list);
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spin_lock_init(&rs->rs_rdma_lock);
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rs->rs_rdma_keys = RB_ROOT;
|
|
|
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spin_lock_irqsave(&rds_sock_lock, flags);
|
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list_add_tail(&rs->rs_item, &rds_sock_list);
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rds_sock_count++;
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spin_unlock_irqrestore(&rds_sock_lock, flags);
|
|
|
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return 0;
|
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}
|
|
|
|
static int rds_create(struct net *net, struct socket *sock, int protocol,
|
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int kern)
|
|
{
|
|
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 const 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)
|
|
{
|
|
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);
|
|
|
|
goto out;
|
|
|
|
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);
|