![Sowmini Varadhan](/assets/img/avatar_default.png)
The RDS transport has to be able to distinguish between
two types of failure events:
(a) when the transport fails (e.g., TCP connection reset)
but the RDS socket/connection layer on both sides stays
the same
(b) when the peer's RDS layer itself resets (e.g., due to module
reload or machine reboot at the peer)
In case (a) both sides must reconnect and continue the RDS messaging
without any message loss or disruption to the message sequence numbers,
and this is achieved by rds_send_path_reset().
In case (b) we should reset all rds_connection state to the
new incarnation of the peer. Examples of state that needs to
be reset are next expected rx sequence number from, or messages to be
retransmitted to, the new incarnation of the peer.
To achieve this, the RDS handshake probe added as part of
commit 5916e2c155
("RDS: TCP: Enable multipath RDS for TCP")
is enhanced so that sender and receiver of the RDS ping-probe
will add a generation number as part of the RDS_EXTHDR_GEN_NUM
extension header. Each peer stores local and remote generation
numbers as part of each rds_connection. Changes in generation
number will be detected via incoming handshake probe ping
request or response and will allow the receiver to reset rds_connection
state.
Signed-off-by: Sowmini Varadhan <sowmini.varadhan@oracle.com>
Acked-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
673 lines
16 KiB
C
673 lines
16 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/gfp.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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/* 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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if (!sk)
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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_bh(&rds_sock_lock);
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list_del_init(&rs->rs_item);
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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;
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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_sleep(sk), wait);
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if (rs->rs_seen_congestion)
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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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/* clear state any time we wake a seen-congested socket */
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if (mask)
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rs->rs_seen_congestion = 0;
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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_set_transport(struct rds_sock *rs, char __user *optval,
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int optlen)
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{
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int t_type;
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if (rs->rs_transport)
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return -EOPNOTSUPP; /* previously attached to transport */
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if (optlen != sizeof(int))
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return -EINVAL;
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if (copy_from_user(&t_type, (int __user *)optval, sizeof(t_type)))
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return -EFAULT;
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if (t_type < 0 || t_type >= RDS_TRANS_COUNT)
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return -EINVAL;
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rs->rs_transport = rds_trans_get(t_type);
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return rs->rs_transport ? 0 : -ENOPROTOOPT;
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}
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static int rds_enable_recvtstamp(struct sock *sk, char __user *optval,
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int optlen)
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{
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int val, valbool;
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if (optlen != sizeof(int))
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return -EFAULT;
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if (get_user(val, (int __user *)optval))
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return -EFAULT;
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valbool = val ? 1 : 0;
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if (valbool)
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sock_set_flag(sk, SOCK_RCVTSTAMP);
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else
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sock_reset_flag(sk, SOCK_RCVTSTAMP);
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return 0;
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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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case SO_RDS_TRANSPORT:
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lock_sock(sock->sk);
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ret = rds_set_transport(rs, optval, optlen);
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release_sock(sock->sk);
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break;
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case SO_TIMESTAMP:
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lock_sock(sock->sk);
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ret = rds_enable_recvtstamp(sock->sk, optval, optlen);
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release_sock(sock->sk);
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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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int trans;
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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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case SO_RDS_TRANSPORT:
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if (len < sizeof(int)) {
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ret = -EINVAL;
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break;
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}
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trans = (rs->rs_transport ? rs->rs_transport->t_type :
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RDS_TRANS_NONE); /* unbound */
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if (put_user(trans, (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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static void rds_sock_destruct(struct sock *sk)
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{
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struct rds_sock *rs = rds_sk_to_rs(sk);
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WARN_ON((&rs->rs_item != rs->rs_item.next ||
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&rs->rs_item != rs->rs_item.prev));
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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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struct rds_sock *rs;
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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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sk->sk_destruct = rds_sock_destruct;
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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_bh(&rds_sock_lock);
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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_bh(&rds_sock_lock);
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return 0;
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}
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static int rds_create(struct net *net, struct socket *sock, int protocol,
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int kern)
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{
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struct sock *sk;
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|
|
if (sock->type != SOCK_SEQPACKET || protocol)
|
|
return -ESOCKTNOSUPPORT;
|
|
|
|
sk = sk_alloc(net, AF_RDS, GFP_ATOMIC, &rds_proto, kern);
|
|
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 rds_incoming *inc;
|
|
unsigned int total = 0;
|
|
|
|
len /= sizeof(struct rds_info_message);
|
|
|
|
spin_lock_bh(&rds_sock_lock);
|
|
|
|
list_for_each_entry(rs, &rds_sock_list, rs_item) {
|
|
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_bh(&rds_sock_lock);
|
|
|
|
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;
|
|
|
|
len /= sizeof(struct rds_info_socket);
|
|
|
|
spin_lock_bh(&rds_sock_lock);
|
|
|
|
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_bh(&rds_sock_lock);
|
|
}
|
|
|
|
static void 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_bind_lock_destroy();
|
|
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);
|
|
|
|
u32 rds_gen_num;
|
|
|
|
static int rds_init(void)
|
|
{
|
|
int ret;
|
|
|
|
net_get_random_once(&rds_gen_num, sizeof(rds_gen_num));
|
|
|
|
ret = rds_bind_lock_init();
|
|
if (ret)
|
|
goto out;
|
|
|
|
ret = rds_conn_init();
|
|
if (ret)
|
|
goto out_bind;
|
|
|
|
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_bind:
|
|
rds_bind_lock_destroy();
|
|
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);
|