335776bd69
Now that transports can be loaded in arbitrary order, it is important for rds_trans_get_preferred() to look for them in a particular order, instead of walking the list until it finds a transport that works for a given address. Now, each transport registers for a specific transport slot, and these are ordered so that preferred transports come first, and then if they are not loaded, other transports are queried. Signed-off-by: Andy Grover <andy.grover@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net>
320 lines
8.7 KiB
C
320 lines
8.7 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/kernel.h>
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#include <linux/in.h>
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#include <net/tcp.h>
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#include "rds.h"
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#include "tcp.h"
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/* only for info exporting */
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static DEFINE_SPINLOCK(rds_tcp_tc_list_lock);
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static LIST_HEAD(rds_tcp_tc_list);
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unsigned int rds_tcp_tc_count;
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/* Track rds_tcp_connection structs so they can be cleaned up */
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static DEFINE_SPINLOCK(rds_tcp_conn_lock);
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static LIST_HEAD(rds_tcp_conn_list);
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static struct kmem_cache *rds_tcp_conn_slab;
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#define RDS_TCP_DEFAULT_BUFSIZE (128 * 1024)
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/* doing it this way avoids calling tcp_sk() */
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void rds_tcp_nonagle(struct socket *sock)
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{
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mm_segment_t oldfs = get_fs();
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int val = 1;
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set_fs(KERNEL_DS);
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sock->ops->setsockopt(sock, SOL_TCP, TCP_NODELAY, (char __user *)&val,
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sizeof(val));
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set_fs(oldfs);
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}
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void rds_tcp_tune(struct socket *sock)
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{
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struct sock *sk = sock->sk;
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rds_tcp_nonagle(sock);
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/*
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* We're trying to saturate gigabit with the default,
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* see svc_sock_setbufsize().
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*/
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lock_sock(sk);
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sk->sk_sndbuf = RDS_TCP_DEFAULT_BUFSIZE;
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sk->sk_rcvbuf = RDS_TCP_DEFAULT_BUFSIZE;
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sk->sk_userlocks |= SOCK_SNDBUF_LOCK|SOCK_RCVBUF_LOCK;
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release_sock(sk);
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}
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u32 rds_tcp_snd_nxt(struct rds_tcp_connection *tc)
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{
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return tcp_sk(tc->t_sock->sk)->snd_nxt;
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}
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u32 rds_tcp_snd_una(struct rds_tcp_connection *tc)
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{
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return tcp_sk(tc->t_sock->sk)->snd_una;
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}
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void rds_tcp_restore_callbacks(struct socket *sock,
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struct rds_tcp_connection *tc)
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{
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rdsdebug("restoring sock %p callbacks from tc %p\n", sock, tc);
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write_lock_bh(&sock->sk->sk_callback_lock);
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/* done under the callback_lock to serialize with write_space */
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spin_lock(&rds_tcp_tc_list_lock);
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list_del_init(&tc->t_list_item);
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rds_tcp_tc_count--;
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spin_unlock(&rds_tcp_tc_list_lock);
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tc->t_sock = NULL;
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sock->sk->sk_write_space = tc->t_orig_write_space;
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sock->sk->sk_data_ready = tc->t_orig_data_ready;
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sock->sk->sk_state_change = tc->t_orig_state_change;
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sock->sk->sk_user_data = NULL;
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write_unlock_bh(&sock->sk->sk_callback_lock);
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}
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/*
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* This is the only path that sets tc->t_sock. Send and receive trust that
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* it is set. The RDS_CONN_CONNECTED bit protects those paths from being
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* called while it isn't set.
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*/
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void rds_tcp_set_callbacks(struct socket *sock, struct rds_connection *conn)
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{
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struct rds_tcp_connection *tc = conn->c_transport_data;
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rdsdebug("setting sock %p callbacks to tc %p\n", sock, tc);
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write_lock_bh(&sock->sk->sk_callback_lock);
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/* done under the callback_lock to serialize with write_space */
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spin_lock(&rds_tcp_tc_list_lock);
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list_add_tail(&tc->t_list_item, &rds_tcp_tc_list);
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rds_tcp_tc_count++;
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spin_unlock(&rds_tcp_tc_list_lock);
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/* accepted sockets need our listen data ready undone */
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if (sock->sk->sk_data_ready == rds_tcp_listen_data_ready)
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sock->sk->sk_data_ready = sock->sk->sk_user_data;
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tc->t_sock = sock;
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tc->conn = conn;
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tc->t_orig_data_ready = sock->sk->sk_data_ready;
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tc->t_orig_write_space = sock->sk->sk_write_space;
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tc->t_orig_state_change = sock->sk->sk_state_change;
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sock->sk->sk_user_data = conn;
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sock->sk->sk_data_ready = rds_tcp_data_ready;
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sock->sk->sk_write_space = rds_tcp_write_space;
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sock->sk->sk_state_change = rds_tcp_state_change;
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write_unlock_bh(&sock->sk->sk_callback_lock);
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}
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static void rds_tcp_tc_info(struct socket *sock, unsigned int len,
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struct rds_info_iterator *iter,
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struct rds_info_lengths *lens)
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{
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struct rds_info_tcp_socket tsinfo;
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struct rds_tcp_connection *tc;
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unsigned long flags;
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struct sockaddr_in sin;
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int sinlen;
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spin_lock_irqsave(&rds_tcp_tc_list_lock, flags);
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if (len / sizeof(tsinfo) < rds_tcp_tc_count)
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goto out;
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list_for_each_entry(tc, &rds_tcp_tc_list, t_list_item) {
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sock->ops->getname(sock, (struct sockaddr *)&sin, &sinlen, 0);
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tsinfo.local_addr = sin.sin_addr.s_addr;
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tsinfo.local_port = sin.sin_port;
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sock->ops->getname(sock, (struct sockaddr *)&sin, &sinlen, 1);
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tsinfo.peer_addr = sin.sin_addr.s_addr;
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tsinfo.peer_port = sin.sin_port;
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tsinfo.hdr_rem = tc->t_tinc_hdr_rem;
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tsinfo.data_rem = tc->t_tinc_data_rem;
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tsinfo.last_sent_nxt = tc->t_last_sent_nxt;
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tsinfo.last_expected_una = tc->t_last_expected_una;
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tsinfo.last_seen_una = tc->t_last_seen_una;
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rds_info_copy(iter, &tsinfo, sizeof(tsinfo));
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}
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out:
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lens->nr = rds_tcp_tc_count;
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lens->each = sizeof(tsinfo);
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spin_unlock_irqrestore(&rds_tcp_tc_list_lock, flags);
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}
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static int rds_tcp_laddr_check(__be32 addr)
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{
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if (inet_addr_type(&init_net, addr) == RTN_LOCAL)
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return 0;
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return -EADDRNOTAVAIL;
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}
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static int rds_tcp_conn_alloc(struct rds_connection *conn, gfp_t gfp)
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{
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struct rds_tcp_connection *tc;
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tc = kmem_cache_alloc(rds_tcp_conn_slab, gfp);
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if (tc == NULL)
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return -ENOMEM;
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tc->t_sock = NULL;
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tc->t_tinc = NULL;
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tc->t_tinc_hdr_rem = sizeof(struct rds_header);
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tc->t_tinc_data_rem = 0;
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conn->c_transport_data = tc;
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spin_lock_irq(&rds_tcp_conn_lock);
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list_add_tail(&tc->t_tcp_node, &rds_tcp_conn_list);
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spin_unlock_irq(&rds_tcp_conn_lock);
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rdsdebug("alloced tc %p\n", conn->c_transport_data);
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return 0;
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}
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static void rds_tcp_conn_free(void *arg)
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{
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struct rds_tcp_connection *tc = arg;
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rdsdebug("freeing tc %p\n", tc);
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kmem_cache_free(rds_tcp_conn_slab, tc);
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}
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static void rds_tcp_destroy_conns(void)
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{
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struct rds_tcp_connection *tc, *_tc;
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LIST_HEAD(tmp_list);
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/* avoid calling conn_destroy with irqs off */
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spin_lock_irq(&rds_tcp_conn_lock);
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list_splice(&rds_tcp_conn_list, &tmp_list);
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INIT_LIST_HEAD(&rds_tcp_conn_list);
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spin_unlock_irq(&rds_tcp_conn_lock);
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list_for_each_entry_safe(tc, _tc, &tmp_list, t_tcp_node) {
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if (tc->conn->c_passive)
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rds_conn_destroy(tc->conn->c_passive);
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rds_conn_destroy(tc->conn);
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}
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}
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void rds_tcp_exit(void)
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{
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rds_info_deregister_func(RDS_INFO_TCP_SOCKETS, rds_tcp_tc_info);
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rds_tcp_listen_stop();
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rds_tcp_destroy_conns();
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rds_trans_unregister(&rds_tcp_transport);
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rds_tcp_recv_exit();
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kmem_cache_destroy(rds_tcp_conn_slab);
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}
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module_exit(rds_tcp_exit);
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struct rds_transport rds_tcp_transport = {
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.laddr_check = rds_tcp_laddr_check,
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.xmit_prepare = rds_tcp_xmit_prepare,
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.xmit_complete = rds_tcp_xmit_complete,
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.xmit_cong_map = rds_tcp_xmit_cong_map,
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.xmit = rds_tcp_xmit,
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.recv = rds_tcp_recv,
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.conn_alloc = rds_tcp_conn_alloc,
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.conn_free = rds_tcp_conn_free,
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.conn_connect = rds_tcp_conn_connect,
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.conn_shutdown = rds_tcp_conn_shutdown,
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.inc_copy_to_user = rds_tcp_inc_copy_to_user,
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.inc_purge = rds_tcp_inc_purge,
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.inc_free = rds_tcp_inc_free,
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.stats_info_copy = rds_tcp_stats_info_copy,
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.exit = rds_tcp_exit,
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.t_owner = THIS_MODULE,
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.t_name = "tcp",
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.t_type = RDS_TRANS_TCP,
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.t_prefer_loopback = 1,
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};
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int __init rds_tcp_init(void)
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{
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int ret;
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rds_tcp_conn_slab = kmem_cache_create("rds_tcp_connection",
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sizeof(struct rds_tcp_connection),
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0, 0, NULL);
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if (rds_tcp_conn_slab == NULL) {
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ret = -ENOMEM;
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goto out;
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}
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ret = rds_tcp_recv_init();
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if (ret)
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goto out_slab;
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ret = rds_trans_register(&rds_tcp_transport);
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if (ret)
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goto out_recv;
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ret = rds_tcp_listen_init();
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if (ret)
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goto out_register;
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rds_info_register_func(RDS_INFO_TCP_SOCKETS, rds_tcp_tc_info);
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goto out;
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out_register:
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rds_trans_unregister(&rds_tcp_transport);
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out_recv:
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rds_tcp_recv_exit();
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out_slab:
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kmem_cache_destroy(rds_tcp_conn_slab);
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out:
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return ret;
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}
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module_init(rds_tcp_init);
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MODULE_AUTHOR("Oracle Corporation <rds-devel@oss.oracle.com>");
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MODULE_DESCRIPTION("RDS: TCP transport");
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MODULE_LICENSE("Dual BSD/GPL");
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