This code allows RDS to be tunneled over a TCP connection.
RDMA operations are disabled when using TCP transport,
but this frees RDS from the IB/RDMA stack dependency, and allows
it to be used with standard Ethernet adapters, or in a VM.
Signed-off-by: Andy Grover <andy.grover@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
u_int64_t inum;
} __attribute__((packed));
+struct rds_info_tcp_socket {
+ __be32 local_addr;
+ __be16 local_port;
+ __be32 peer_addr;
+ __be16 peer_port;
+ u_int64_t hdr_rem;
+ u_int64_t data_rem;
+ u_int32_t last_sent_nxt;
+ u_int32_t last_expected_una;
+ u_int32_t last_seen_una;
+} __attribute__((packed));
+
#define RDS_IB_GID_LEN 16
struct rds_info_rdma_connection {
__be32 src_addr;
--- /dev/null
+/*
+ * Copyright (c) 2006 Oracle. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses. You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ * - Redistributions of source code must retain the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer in the documentation and/or other materials
+ * provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ */
+#include <linux/kernel.h>
+#include <linux/in.h>
+#include <net/tcp.h>
+
+#include "rds.h"
+#include "tcp.h"
+
+/* only for info exporting */
+static DEFINE_SPINLOCK(rds_tcp_tc_list_lock);
+static LIST_HEAD(rds_tcp_tc_list);
+unsigned int rds_tcp_tc_count;
+
+/* Track rds_tcp_connection structs so they can be cleaned up */
+static DEFINE_SPINLOCK(rds_tcp_conn_lock);
+static LIST_HEAD(rds_tcp_conn_list);
+
+static struct kmem_cache *rds_tcp_conn_slab;
+
+#define RDS_TCP_DEFAULT_BUFSIZE (128 * 1024)
+
+/* doing it this way avoids calling tcp_sk() */
+void rds_tcp_nonagle(struct socket *sock)
+{
+ mm_segment_t oldfs = get_fs();
+ int val = 1;
+
+ set_fs(KERNEL_DS);
+ sock->ops->setsockopt(sock, SOL_TCP, TCP_NODELAY, (char __user *)&val,
+ sizeof(val));
+ set_fs(oldfs);
+}
+
+void rds_tcp_tune(struct socket *sock)
+{
+ struct sock *sk = sock->sk;
+
+ rds_tcp_nonagle(sock);
+
+ /*
+ * We're trying to saturate gigabit with the default,
+ * see svc_sock_setbufsize().
+ */
+ lock_sock(sk);
+ sk->sk_sndbuf = RDS_TCP_DEFAULT_BUFSIZE;
+ sk->sk_rcvbuf = RDS_TCP_DEFAULT_BUFSIZE;
+ sk->sk_userlocks |= SOCK_SNDBUF_LOCK|SOCK_RCVBUF_LOCK;
+ release_sock(sk);
+}
+
+u32 rds_tcp_snd_nxt(struct rds_tcp_connection *tc)
+{
+ return tcp_sk(tc->t_sock->sk)->snd_nxt;
+}
+
+u32 rds_tcp_snd_una(struct rds_tcp_connection *tc)
+{
+ return tcp_sk(tc->t_sock->sk)->snd_una;
+}
+
+void rds_tcp_restore_callbacks(struct socket *sock,
+ struct rds_tcp_connection *tc)
+{
+ rdsdebug("restoring sock %p callbacks from tc %p\n", sock, tc);
+ write_lock_bh(&sock->sk->sk_callback_lock);
+
+ /* done under the callback_lock to serialize with write_space */
+ spin_lock(&rds_tcp_tc_list_lock);
+ list_del_init(&tc->t_list_item);
+ rds_tcp_tc_count--;
+ spin_unlock(&rds_tcp_tc_list_lock);
+
+ tc->t_sock = NULL;
+
+ sock->sk->sk_write_space = tc->t_orig_write_space;
+ sock->sk->sk_data_ready = tc->t_orig_data_ready;
+ sock->sk->sk_state_change = tc->t_orig_state_change;
+ sock->sk->sk_user_data = NULL;
+
+ write_unlock_bh(&sock->sk->sk_callback_lock);
+}
+
+/*
+ * This is the only path that sets tc->t_sock. Send and receive trust that
+ * it is set. The RDS_CONN_CONNECTED bit protects those paths from being
+ * called while it isn't set.
+ */
+void rds_tcp_set_callbacks(struct socket *sock, struct rds_connection *conn)
+{
+ struct rds_tcp_connection *tc = conn->c_transport_data;
+
+ rdsdebug("setting sock %p callbacks to tc %p\n", sock, tc);
+ write_lock_bh(&sock->sk->sk_callback_lock);
+
+ /* done under the callback_lock to serialize with write_space */
+ spin_lock(&rds_tcp_tc_list_lock);
+ list_add_tail(&tc->t_list_item, &rds_tcp_tc_list);
+ rds_tcp_tc_count++;
+ spin_unlock(&rds_tcp_tc_list_lock);
+
+ /* accepted sockets need our listen data ready undone */
+ if (sock->sk->sk_data_ready == rds_tcp_listen_data_ready)
+ sock->sk->sk_data_ready = sock->sk->sk_user_data;
+
+ tc->t_sock = sock;
+ tc->conn = conn;
+ tc->t_orig_data_ready = sock->sk->sk_data_ready;
+ tc->t_orig_write_space = sock->sk->sk_write_space;
+ tc->t_orig_state_change = sock->sk->sk_state_change;
+
+ sock->sk->sk_user_data = conn;
+ sock->sk->sk_data_ready = rds_tcp_data_ready;
+ sock->sk->sk_write_space = rds_tcp_write_space;
+ sock->sk->sk_state_change = rds_tcp_state_change;
+
+ write_unlock_bh(&sock->sk->sk_callback_lock);
+}
+
+static void rds_tcp_tc_info(struct socket *sock, unsigned int len,
+ struct rds_info_iterator *iter,
+ struct rds_info_lengths *lens)
+{
+ struct rds_info_tcp_socket tsinfo;
+ struct rds_tcp_connection *tc;
+ unsigned long flags;
+ struct sockaddr_in sin;
+ int sinlen;
+
+ spin_lock_irqsave(&rds_tcp_tc_list_lock, flags);
+
+ if (len / sizeof(tsinfo) < rds_tcp_tc_count)
+ goto out;
+
+ list_for_each_entry(tc, &rds_tcp_tc_list, t_list_item) {
+
+ sock->ops->getname(sock, (struct sockaddr *)&sin, &sinlen, 0);
+ tsinfo.local_addr = sin.sin_addr.s_addr;
+ tsinfo.local_port = sin.sin_port;
+ sock->ops->getname(sock, (struct sockaddr *)&sin, &sinlen, 1);
+ tsinfo.peer_addr = sin.sin_addr.s_addr;
+ tsinfo.peer_port = sin.sin_port;
+
+ tsinfo.hdr_rem = tc->t_tinc_hdr_rem;
+ tsinfo.data_rem = tc->t_tinc_data_rem;
+ tsinfo.last_sent_nxt = tc->t_last_sent_nxt;
+ tsinfo.last_expected_una = tc->t_last_expected_una;
+ tsinfo.last_seen_una = tc->t_last_seen_una;
+
+ rds_info_copy(iter, &tsinfo, sizeof(tsinfo));
+ }
+
+out:
+ lens->nr = rds_tcp_tc_count;
+ lens->each = sizeof(tsinfo);
+
+ spin_unlock_irqrestore(&rds_tcp_tc_list_lock, flags);
+}
+
+static int rds_tcp_laddr_check(__be32 addr)
+{
+ if (inet_addr_type(&init_net, addr) == RTN_LOCAL)
+ return 0;
+ return -EADDRNOTAVAIL;
+}
+
+static int rds_tcp_conn_alloc(struct rds_connection *conn, gfp_t gfp)
+{
+ struct rds_tcp_connection *tc;
+
+ tc = kmem_cache_alloc(rds_tcp_conn_slab, gfp);
+ if (tc == NULL)
+ return -ENOMEM;
+
+ tc->t_sock = NULL;
+ tc->t_tinc = NULL;
+ tc->t_tinc_hdr_rem = sizeof(struct rds_header);
+ tc->t_tinc_data_rem = 0;
+
+ conn->c_transport_data = tc;
+
+ spin_lock_irq(&rds_tcp_conn_lock);
+ list_add_tail(&tc->t_tcp_node, &rds_tcp_conn_list);
+ spin_unlock_irq(&rds_tcp_conn_lock);
+
+ rdsdebug("alloced tc %p\n", conn->c_transport_data);
+ return 0;
+}
+
+static void rds_tcp_conn_free(void *arg)
+{
+ struct rds_tcp_connection *tc = arg;
+ rdsdebug("freeing tc %p\n", tc);
+ kmem_cache_free(rds_tcp_conn_slab, tc);
+}
+
+static void rds_tcp_destroy_conns(void)
+{
+ struct rds_tcp_connection *tc, *_tc;
+ LIST_HEAD(tmp_list);
+
+ /* avoid calling conn_destroy with irqs off */
+ spin_lock_irq(&rds_tcp_conn_lock);
+ list_splice(&rds_tcp_conn_list, &tmp_list);
+ INIT_LIST_HEAD(&rds_tcp_conn_list);
+ spin_unlock_irq(&rds_tcp_conn_lock);
+
+ list_for_each_entry_safe(tc, _tc, &tmp_list, t_tcp_node) {
+ if (tc->conn->c_passive)
+ rds_conn_destroy(tc->conn->c_passive);
+ rds_conn_destroy(tc->conn);
+ }
+}
+
+void rds_tcp_exit(void)
+{
+ rds_info_deregister_func(RDS_INFO_TCP_SOCKETS, rds_tcp_tc_info);
+ rds_tcp_listen_stop();
+ rds_tcp_destroy_conns();
+ rds_trans_unregister(&rds_tcp_transport);
+ rds_tcp_recv_exit();
+ kmem_cache_destroy(rds_tcp_conn_slab);
+}
+module_exit(rds_tcp_exit);
+
+struct rds_transport rds_tcp_transport = {
+ .laddr_check = rds_tcp_laddr_check,
+ .xmit_prepare = rds_tcp_xmit_prepare,
+ .xmit_complete = rds_tcp_xmit_complete,
+ .xmit_cong_map = rds_tcp_xmit_cong_map,
+ .xmit = rds_tcp_xmit,
+ .recv = rds_tcp_recv,
+ .conn_alloc = rds_tcp_conn_alloc,
+ .conn_free = rds_tcp_conn_free,
+ .conn_connect = rds_tcp_conn_connect,
+ .conn_shutdown = rds_tcp_conn_shutdown,
+ .inc_copy_to_user = rds_tcp_inc_copy_to_user,
+ .inc_purge = rds_tcp_inc_purge,
+ .inc_free = rds_tcp_inc_free,
+ .stats_info_copy = rds_tcp_stats_info_copy,
+ .exit = rds_tcp_exit,
+ .t_owner = THIS_MODULE,
+ .t_name = "tcp",
+ .t_prefer_loopback = 1,
+};
+
+int __init rds_tcp_init(void)
+{
+ int ret;
+
+ rds_tcp_conn_slab = kmem_cache_create("rds_tcp_connection",
+ sizeof(struct rds_tcp_connection),
+ 0, 0, NULL);
+ if (rds_tcp_conn_slab == NULL) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ ret = rds_tcp_recv_init();
+ if (ret)
+ goto out_slab;
+
+ ret = rds_trans_register(&rds_tcp_transport);
+ if (ret)
+ goto out_recv;
+
+ ret = rds_tcp_listen_init();
+ if (ret)
+ goto out_register;
+
+ rds_info_register_func(RDS_INFO_TCP_SOCKETS, rds_tcp_tc_info);
+
+ goto out;
+
+out_register:
+ rds_trans_unregister(&rds_tcp_transport);
+out_recv:
+ rds_tcp_recv_exit();
+out_slab:
+ kmem_cache_destroy(rds_tcp_conn_slab);
+out:
+ return ret;
+}
+module_init(rds_tcp_init);
+
+MODULE_AUTHOR("Oracle Corporation <rds-devel@oss.oracle.com>");
+MODULE_DESCRIPTION("RDS: TCP transport");
+MODULE_LICENSE("Dual BSD/GPL");
+
--- /dev/null
+#ifndef _RDS_TCP_H
+#define _RDS_TCP_H
+
+#define RDS_TCP_PORT 16385
+
+struct rds_tcp_incoming {
+ struct rds_incoming ti_inc;
+ struct sk_buff_head ti_skb_list;
+};
+
+struct rds_tcp_connection {
+
+ struct list_head t_tcp_node;
+ struct rds_connection *conn;
+ struct socket *t_sock;
+ void *t_orig_write_space;
+ void *t_orig_data_ready;
+ void *t_orig_state_change;
+
+ struct rds_tcp_incoming *t_tinc;
+ size_t t_tinc_hdr_rem;
+ size_t t_tinc_data_rem;
+
+ /* XXX error report? */
+ struct work_struct t_conn_w;
+ struct work_struct t_send_w;
+ struct work_struct t_down_w;
+ struct work_struct t_recv_w;
+
+ /* for info exporting only */
+ struct list_head t_list_item;
+ u32 t_last_sent_nxt;
+ u32 t_last_expected_una;
+ u32 t_last_seen_una;
+};
+
+struct rds_tcp_statistics {
+ uint64_t s_tcp_data_ready_calls;
+ uint64_t s_tcp_write_space_calls;
+ uint64_t s_tcp_sndbuf_full;
+ uint64_t s_tcp_connect_raced;
+ uint64_t s_tcp_listen_closed_stale;
+};
+
+/* tcp.c */
+int __init rds_tcp_init(void);
+void rds_tcp_exit(void);
+void rds_tcp_tune(struct socket *sock);
+void rds_tcp_nonagle(struct socket *sock);
+void rds_tcp_set_callbacks(struct socket *sock, struct rds_connection *conn);
+void rds_tcp_restore_callbacks(struct socket *sock,
+ struct rds_tcp_connection *tc);
+u32 rds_tcp_snd_nxt(struct rds_tcp_connection *tc);
+u32 rds_tcp_snd_una(struct rds_tcp_connection *tc);
+u64 rds_tcp_map_seq(struct rds_tcp_connection *tc, u32 seq);
+extern struct rds_transport rds_tcp_transport;
+
+/* tcp_connect.c */
+int rds_tcp_conn_connect(struct rds_connection *conn);
+void rds_tcp_conn_shutdown(struct rds_connection *conn);
+void rds_tcp_state_change(struct sock *sk);
+
+/* tcp_listen.c */
+int __init rds_tcp_listen_init(void);
+void rds_tcp_listen_stop(void);
+void rds_tcp_listen_data_ready(struct sock *sk, int bytes);
+
+/* tcp_recv.c */
+int __init rds_tcp_recv_init(void);
+void rds_tcp_recv_exit(void);
+void rds_tcp_data_ready(struct sock *sk, int bytes);
+int rds_tcp_recv(struct rds_connection *conn);
+void rds_tcp_inc_purge(struct rds_incoming *inc);
+void rds_tcp_inc_free(struct rds_incoming *inc);
+int rds_tcp_inc_copy_to_user(struct rds_incoming *inc, struct iovec *iov,
+ size_t size);
+
+/* tcp_send.c */
+void rds_tcp_xmit_prepare(struct rds_connection *conn);
+void rds_tcp_xmit_complete(struct rds_connection *conn);
+int rds_tcp_xmit(struct rds_connection *conn, struct rds_message *rm,
+ unsigned int hdr_off, unsigned int sg, unsigned int off);
+void rds_tcp_write_space(struct sock *sk);
+int rds_tcp_xmit_cong_map(struct rds_connection *conn,
+ struct rds_cong_map *map, unsigned long offset);
+
+/* tcp_stats.c */
+DECLARE_PER_CPU(struct rds_tcp_statistics, rds_tcp_stats);
+#define rds_tcp_stats_inc(member) rds_stats_inc_which(rds_tcp_stats, member)
+unsigned int rds_tcp_stats_info_copy(struct rds_info_iterator *iter,
+ unsigned int avail);
+
+#endif
--- /dev/null
+/*
+ * Copyright (c) 2006 Oracle. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses. You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ * - Redistributions of source code must retain the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer in the documentation and/or other materials
+ * provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ */
+#include <linux/kernel.h>
+#include <linux/in.h>
+#include <net/tcp.h>
+
+#include "rds.h"
+#include "tcp.h"
+
+void rds_tcp_state_change(struct sock *sk)
+{
+ void (*state_change)(struct sock *sk);
+ struct rds_connection *conn;
+ struct rds_tcp_connection *tc;
+
+ read_lock(&sk->sk_callback_lock);
+ conn = sk->sk_user_data;
+ if (conn == NULL) {
+ state_change = sk->sk_state_change;
+ goto out;
+ }
+ tc = conn->c_transport_data;
+ state_change = tc->t_orig_state_change;
+
+ rdsdebug("sock %p state_change to %d\n", tc->t_sock, sk->sk_state);
+
+ switch(sk->sk_state) {
+ /* ignore connecting sockets as they make progress */
+ case TCP_SYN_SENT:
+ case TCP_SYN_RECV:
+ break;
+ case TCP_ESTABLISHED:
+ rds_connect_complete(conn);
+ break;
+ case TCP_CLOSE:
+ rds_conn_drop(conn);
+ default:
+ break;
+ }
+out:
+ read_unlock(&sk->sk_callback_lock);
+ state_change(sk);
+}
+
+int rds_tcp_conn_connect(struct rds_connection *conn)
+{
+ struct socket *sock = NULL;
+ struct sockaddr_in src, dest;
+ int ret;
+
+ ret = sock_create(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock);
+ if (ret < 0)
+ goto out;
+
+ rds_tcp_tune(sock);
+
+ src.sin_family = AF_INET;
+ src.sin_addr.s_addr = (__force u32)conn->c_laddr;
+ src.sin_port = (__force u16)htons(0);
+
+ ret = sock->ops->bind(sock, (struct sockaddr *)&src, sizeof(src));
+ if (ret) {
+ rdsdebug("bind failed with %d at address %u.%u.%u.%u\n",
+ ret, NIPQUAD(conn->c_laddr));
+ goto out;
+ }
+
+ dest.sin_family = AF_INET;
+ dest.sin_addr.s_addr = (__force u32)conn->c_faddr;
+ dest.sin_port = (__force u16)htons(RDS_TCP_PORT);
+
+ /*
+ * once we call connect() we can start getting callbacks and they
+ * own the socket
+ */
+ rds_tcp_set_callbacks(sock, conn);
+ ret = sock->ops->connect(sock, (struct sockaddr *)&dest, sizeof(dest),
+ O_NONBLOCK);
+ sock = NULL;
+
+ rdsdebug("connect to address %u.%u.%u.%u returned %d\n",
+ NIPQUAD(conn->c_faddr), ret);
+ if (ret == -EINPROGRESS)
+ ret = 0;
+
+out:
+ if (sock)
+ sock_release(sock);
+ return ret;
+}
+
+/*
+ * Before killing the tcp socket this needs to serialize with callbacks. The
+ * caller has already grabbed the sending sem so we're serialized with other
+ * senders.
+ *
+ * TCP calls the callbacks with the sock lock so we hold it while we reset the
+ * callbacks to those set by TCP. Our callbacks won't execute again once we
+ * hold the sock lock.
+ */
+void rds_tcp_conn_shutdown(struct rds_connection *conn)
+{
+ struct rds_tcp_connection *tc = conn->c_transport_data;
+ struct socket *sock = tc->t_sock;
+
+ rdsdebug("shutting down conn %p tc %p sock %p\n", conn, tc, sock);
+
+ if (sock) {
+ sock->ops->shutdown(sock, RCV_SHUTDOWN | SEND_SHUTDOWN);
+ lock_sock(sock->sk);
+ rds_tcp_restore_callbacks(sock, tc); /* tc->tc_sock = NULL */
+
+ release_sock(sock->sk);
+ sock_release(sock);
+ };
+
+ if (tc->t_tinc) {
+ rds_inc_put(&tc->t_tinc->ti_inc);
+ tc->t_tinc = NULL;
+ }
+ tc->t_tinc_hdr_rem = sizeof(struct rds_header);
+ tc->t_tinc_data_rem = 0;
+}
--- /dev/null
+/*
+ * Copyright (c) 2006 Oracle. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses. You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ * - Redistributions of source code must retain the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer in the documentation and/or other materials
+ * provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ */
+#include <linux/kernel.h>
+#include <linux/in.h>
+#include <net/tcp.h>
+
+#include "rds.h"
+#include "tcp.h"
+
+/*
+ * cheesy, but simple..
+ */
+static void rds_tcp_accept_worker(struct work_struct *work);
+static DECLARE_WORK(rds_tcp_listen_work, rds_tcp_accept_worker);
+static struct socket *rds_tcp_listen_sock;
+
+static int rds_tcp_accept_one(struct socket *sock)
+{
+ struct socket *new_sock = NULL;
+ struct rds_connection *conn;
+ int ret;
+ struct inet_sock *inet;
+
+ ret = sock_create_lite(sock->sk->sk_family, sock->sk->sk_type,
+ sock->sk->sk_protocol, &new_sock);
+ if (ret)
+ goto out;
+
+ new_sock->type = sock->type;
+ new_sock->ops = sock->ops;
+ ret = sock->ops->accept(sock, new_sock, O_NONBLOCK);
+ if (ret < 0)
+ goto out;
+
+ rds_tcp_tune(new_sock);
+
+ inet = inet_sk(new_sock->sk);
+
+ rdsdebug("accepted tcp %u.%u.%u.%u:%u -> %u.%u.%u.%u:%u\n",
+ NIPQUAD(inet->saddr), ntohs(inet->sport),
+ NIPQUAD(inet->daddr), ntohs(inet->dport));
+
+ conn = rds_conn_create(inet->saddr, inet->daddr, &rds_tcp_transport,
+ GFP_KERNEL);
+ if (IS_ERR(conn)) {
+ ret = PTR_ERR(conn);
+ goto out;
+ }
+
+ /*
+ * see the comment above rds_queue_delayed_reconnect()
+ */
+ if (!rds_conn_transition(conn, RDS_CONN_DOWN, RDS_CONN_CONNECTING)) {
+ if (rds_conn_state(conn) == RDS_CONN_UP)
+ rds_tcp_stats_inc(s_tcp_listen_closed_stale);
+ else
+ rds_tcp_stats_inc(s_tcp_connect_raced);
+ rds_conn_drop(conn);
+ ret = 0;
+ goto out;
+ }
+
+ rds_tcp_set_callbacks(new_sock, conn);
+ rds_connect_complete(conn);
+ new_sock = NULL;
+ ret = 0;
+
+out:
+ if (new_sock)
+ sock_release(new_sock);
+ return ret;
+}
+
+static void rds_tcp_accept_worker(struct work_struct *work)
+{
+ while (rds_tcp_accept_one(rds_tcp_listen_sock) == 0)
+ cond_resched();
+}
+
+void rds_tcp_listen_data_ready(struct sock *sk, int bytes)
+{
+ void (*ready)(struct sock *sk, int bytes);
+
+ rdsdebug("listen data ready sk %p\n", sk);
+
+ read_lock(&sk->sk_callback_lock);
+ ready = sk->sk_user_data;
+ if (ready == NULL) { /* check for teardown race */
+ ready = sk->sk_data_ready;
+ goto out;
+ }
+
+ /*
+ * ->sk_data_ready is also called for a newly established child socket
+ * before it has been accepted and the accepter has set up their
+ * data_ready.. we only want to queue listen work for our listening
+ * socket
+ */
+ if (sk->sk_state == TCP_LISTEN)
+ queue_work(rds_wq, &rds_tcp_listen_work);
+
+out:
+ read_unlock(&sk->sk_callback_lock);
+ ready(sk, bytes);
+}
+
+int __init rds_tcp_listen_init(void)
+{
+ struct sockaddr_in sin;
+ struct socket *sock = NULL;
+ int ret;
+
+ ret = sock_create(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock);
+ if (ret < 0)
+ goto out;
+
+ sock->sk->sk_reuse = 1;
+ rds_tcp_nonagle(sock);
+
+ write_lock_bh(&sock->sk->sk_callback_lock);
+ sock->sk->sk_user_data = sock->sk->sk_data_ready;
+ sock->sk->sk_data_ready = rds_tcp_listen_data_ready;
+ write_unlock_bh(&sock->sk->sk_callback_lock);
+
+ sin.sin_family = PF_INET,
+ sin.sin_addr.s_addr = (__force u32)htonl(INADDR_ANY);
+ sin.sin_port = (__force u16)htons(RDS_TCP_PORT);
+
+ ret = sock->ops->bind(sock, (struct sockaddr *)&sin, sizeof(sin));
+ if (ret < 0)
+ goto out;
+
+ ret = sock->ops->listen(sock, 64);
+ if (ret < 0)
+ goto out;
+
+ rds_tcp_listen_sock = sock;
+ sock = NULL;
+out:
+ if (sock)
+ sock_release(sock);
+ return ret;
+}
+
+void rds_tcp_listen_stop(void)
+{
+ struct socket *sock = rds_tcp_listen_sock;
+ struct sock *sk;
+
+ if (sock == NULL)
+ return;
+
+ sk = sock->sk;
+
+ /* serialize with and prevent further callbacks */
+ lock_sock(sk);
+ write_lock_bh(&sk->sk_callback_lock);
+ if (sk->sk_user_data) {
+ sk->sk_data_ready = sk->sk_user_data;
+ sk->sk_user_data = NULL;
+ }
+ write_unlock_bh(&sk->sk_callback_lock);
+ release_sock(sk);
+
+ /* wait for accepts to stop and close the socket */
+ flush_workqueue(rds_wq);
+ sock_release(sock);
+ rds_tcp_listen_sock = NULL;
+}
--- /dev/null
+/*
+ * Copyright (c) 2006 Oracle. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses. You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ * - Redistributions of source code must retain the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer in the documentation and/or other materials
+ * provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ */
+#include <linux/kernel.h>
+#include <net/tcp.h>
+
+#include "rds.h"
+#include "tcp.h"
+
+static struct kmem_cache *rds_tcp_incoming_slab;
+
+void rds_tcp_inc_purge(struct rds_incoming *inc)
+{
+ struct rds_tcp_incoming *tinc;
+ tinc = container_of(inc, struct rds_tcp_incoming, ti_inc);
+ rdsdebug("purging tinc %p inc %p\n", tinc, inc);
+ skb_queue_purge(&tinc->ti_skb_list);
+}
+
+void rds_tcp_inc_free(struct rds_incoming *inc)
+{
+ struct rds_tcp_incoming *tinc;
+ tinc = container_of(inc, struct rds_tcp_incoming, ti_inc);
+ rds_tcp_inc_purge(inc);
+ rdsdebug("freeing tinc %p inc %p\n", tinc, inc);
+ kmem_cache_free(rds_tcp_incoming_slab, tinc);
+}
+
+/*
+ * this is pretty lame, but, whatever.
+ */
+int rds_tcp_inc_copy_to_user(struct rds_incoming *inc, struct iovec *first_iov,
+ size_t size)
+{
+ struct rds_tcp_incoming *tinc;
+ struct iovec *iov, tmp;
+ struct sk_buff *skb;
+ unsigned long to_copy, skb_off;
+ int ret = 0;
+
+ if (size == 0)
+ goto out;
+
+ tinc = container_of(inc, struct rds_tcp_incoming, ti_inc);
+ iov = first_iov;
+ tmp = *iov;
+
+ skb_queue_walk(&tinc->ti_skb_list, skb) {
+ skb_off = 0;
+ while (skb_off < skb->len) {
+ while (tmp.iov_len == 0) {
+ iov++;
+ tmp = *iov;
+ }
+
+ to_copy = min(tmp.iov_len, size);
+ to_copy = min(to_copy, skb->len - skb_off);
+
+ rdsdebug("ret %d size %zu skb %p skb_off %lu "
+ "skblen %d iov_base %p iov_len %zu cpy %lu\n",
+ ret, size, skb, skb_off, skb->len,
+ tmp.iov_base, tmp.iov_len, to_copy);
+
+ /* modifies tmp as it copies */
+ if (skb_copy_datagram_iovec(skb, skb_off, &tmp,
+ to_copy)) {
+ ret = -EFAULT;
+ goto out;
+ }
+
+ size -= to_copy;
+ ret += to_copy;
+ skb_off += to_copy;
+ if (size == 0)
+ goto out;
+ }
+ }
+out:
+ return ret;
+}
+
+/*
+ * We have a series of skbs that have fragmented pieces of the congestion
+ * bitmap. They must add up to the exact size of the congestion bitmap. We
+ * use the skb helpers to copy those into the pages that make up the in-memory
+ * congestion bitmap for the remote address of this connection. We then tell
+ * the congestion core that the bitmap has been changed so that it can wake up
+ * sleepers.
+ *
+ * This is racing with sending paths which are using test_bit to see if the
+ * bitmap indicates that their recipient is congested.
+ */
+
+static void rds_tcp_cong_recv(struct rds_connection *conn,
+ struct rds_tcp_incoming *tinc)
+{
+ struct sk_buff *skb;
+ unsigned int to_copy, skb_off;
+ unsigned int map_off;
+ unsigned int map_page;
+ struct rds_cong_map *map;
+ int ret;
+
+ /* catch completely corrupt packets */
+ if (be32_to_cpu(tinc->ti_inc.i_hdr.h_len) != RDS_CONG_MAP_BYTES)
+ return;
+
+ map_page = 0;
+ map_off = 0;
+ map = conn->c_fcong;
+
+ skb_queue_walk(&tinc->ti_skb_list, skb) {
+ skb_off = 0;
+ while (skb_off < skb->len) {
+ to_copy = min_t(unsigned int, PAGE_SIZE - map_off,
+ skb->len - skb_off);
+
+ BUG_ON(map_page >= RDS_CONG_MAP_PAGES);
+
+ /* only returns 0 or -error */
+ ret = skb_copy_bits(skb, skb_off,
+ (void *)map->m_page_addrs[map_page] + map_off,
+ to_copy);
+ BUG_ON(ret != 0);
+
+ skb_off += to_copy;
+ map_off += to_copy;
+ if (map_off == PAGE_SIZE) {
+ map_off = 0;
+ map_page++;
+ }
+ }
+ }
+
+ rds_cong_map_updated(map, ~(u64) 0);
+}
+
+struct rds_tcp_desc_arg {
+ struct rds_connection *conn;
+ gfp_t gfp;
+ enum km_type km;
+};
+
+static int rds_tcp_data_recv(read_descriptor_t *desc, struct sk_buff *skb,
+ unsigned int offset, size_t len)
+{
+ struct rds_tcp_desc_arg *arg = desc->arg.data;
+ struct rds_connection *conn = arg->conn;
+ struct rds_tcp_connection *tc = conn->c_transport_data;
+ struct rds_tcp_incoming *tinc = tc->t_tinc;
+ struct sk_buff *clone;
+ size_t left = len, to_copy;
+
+ rdsdebug("tcp data tc %p skb %p offset %u len %zu\n", tc, skb, offset,
+ len);
+
+ /*
+ * tcp_read_sock() interprets partial progress as an indication to stop
+ * processing.
+ */
+ while (left) {
+ if (tinc == NULL) {
+ tinc = kmem_cache_alloc(rds_tcp_incoming_slab,
+ arg->gfp);
+ if (tinc == NULL) {
+ desc->error = -ENOMEM;
+ goto out;
+ }
+ tc->t_tinc = tinc;
+ rdsdebug("alloced tinc %p\n", tinc);
+ rds_inc_init(&tinc->ti_inc, conn, conn->c_faddr);
+ /*
+ * XXX * we might be able to use the __ variants when
+ * we've already serialized at a higher level.
+ */
+ skb_queue_head_init(&tinc->ti_skb_list);
+ }
+
+ if (left && tc->t_tinc_hdr_rem) {
+ to_copy = min(tc->t_tinc_hdr_rem, left);
+ rdsdebug("copying %zu header from skb %p\n", to_copy,
+ skb);
+ skb_copy_bits(skb, offset,
+ (char *)&tinc->ti_inc.i_hdr +
+ sizeof(struct rds_header) -
+ tc->t_tinc_hdr_rem,
+ to_copy);
+ tc->t_tinc_hdr_rem -= to_copy;
+ left -= to_copy;
+ offset += to_copy;
+
+ if (tc->t_tinc_hdr_rem == 0) {
+ /* could be 0 for a 0 len message */
+ tc->t_tinc_data_rem =
+ be32_to_cpu(tinc->ti_inc.i_hdr.h_len);
+ }
+ }
+
+ if (left && tc->t_tinc_data_rem) {
+ clone = skb_clone(skb, arg->gfp);
+ if (clone == NULL) {
+ desc->error = -ENOMEM;
+ goto out;
+ }
+
+ to_copy = min(tc->t_tinc_data_rem, left);
+ pskb_pull(clone, offset);
+ pskb_trim(clone, to_copy);
+ skb_queue_tail(&tinc->ti_skb_list, clone);
+
+ rdsdebug("skb %p data %p len %d off %u to_copy %zu -> "
+ "clone %p data %p len %d\n",
+ skb, skb->data, skb->len, offset, to_copy,
+ clone, clone->data, clone->len);
+
+ tc->t_tinc_data_rem -= to_copy;
+ left -= to_copy;
+ offset += to_copy;
+ }
+
+ if (tc->t_tinc_hdr_rem == 0 && tc->t_tinc_data_rem == 0) {
+ if (tinc->ti_inc.i_hdr.h_flags == RDS_FLAG_CONG_BITMAP)
+ rds_tcp_cong_recv(conn, tinc);
+ else
+ rds_recv_incoming(conn, conn->c_faddr,
+ conn->c_laddr, &tinc->ti_inc,
+ arg->gfp, arg->km);
+
+ tc->t_tinc_hdr_rem = sizeof(struct rds_header);
+ tc->t_tinc_data_rem = 0;
+ tc->t_tinc = NULL;
+ rds_inc_put(&tinc->ti_inc);
+ tinc = NULL;
+ }
+ }
+out:
+ rdsdebug("returning len %zu left %zu skb len %d rx queue depth %d\n",
+ len, left, skb->len,
+ skb_queue_len(&tc->t_sock->sk->sk_receive_queue));
+ return len - left;
+}
+
+/* the caller has to hold the sock lock */
+int rds_tcp_read_sock(struct rds_connection *conn, gfp_t gfp, enum km_type km)
+{
+ struct rds_tcp_connection *tc = conn->c_transport_data;
+ struct socket *sock = tc->t_sock;
+ read_descriptor_t desc;
+ struct rds_tcp_desc_arg arg;
+
+ /* It's like glib in the kernel! */
+ arg.conn = conn;
+ arg.gfp = gfp;
+ arg.km = km;
+ desc.arg.data = &arg;
+ desc.error = 0;
+ desc.count = 1; /* give more than one skb per call */
+
+ tcp_read_sock(sock->sk, &desc, rds_tcp_data_recv);
+ rdsdebug("tcp_read_sock for tc %p gfp 0x%x returned %d\n", tc, gfp,
+ desc.error);
+
+ return desc.error;
+}
+
+/*
+ * We hold the sock lock to serialize our rds_tcp_recv->tcp_read_sock from
+ * data_ready.
+ *
+ * if we fail to allocate we're in trouble.. blindly wait some time before
+ * trying again to see if the VM can free up something for us.
+ */
+int rds_tcp_recv(struct rds_connection *conn)
+{
+ struct rds_tcp_connection *tc = conn->c_transport_data;
+ struct socket *sock = tc->t_sock;
+ int ret = 0;
+
+ rdsdebug("recv worker conn %p tc %p sock %p\n", conn, tc, sock);
+
+ lock_sock(sock->sk);
+ ret = rds_tcp_read_sock(conn, GFP_KERNEL, KM_USER0);
+ release_sock(sock->sk);
+
+ return ret;
+}
+
+void rds_tcp_data_ready(struct sock *sk, int bytes)
+{
+ void (*ready)(struct sock *sk, int bytes);
+ struct rds_connection *conn;
+ struct rds_tcp_connection *tc;
+
+ rdsdebug("data ready sk %p bytes %d\n", sk, bytes);
+
+ read_lock(&sk->sk_callback_lock);
+ conn = sk->sk_user_data;
+ if (conn == NULL) { /* check for teardown race */
+ ready = sk->sk_data_ready;
+ goto out;
+ }
+
+ tc = conn->c_transport_data;
+ ready = tc->t_orig_data_ready;
+ rds_tcp_stats_inc(s_tcp_data_ready_calls);
+
+ if (rds_tcp_read_sock(conn, GFP_ATOMIC, KM_SOFTIRQ0) == -ENOMEM)
+ queue_delayed_work(rds_wq, &conn->c_recv_w, 0);
+out:
+ read_unlock(&sk->sk_callback_lock);
+ ready(sk, bytes);
+}
+
+int __init rds_tcp_recv_init(void)
+{
+ rds_tcp_incoming_slab = kmem_cache_create("rds_tcp_incoming",
+ sizeof(struct rds_tcp_incoming),
+ 0, 0, NULL);
+ if (rds_tcp_incoming_slab == NULL)
+ return -ENOMEM;
+ return 0;
+}
+
+void rds_tcp_recv_exit(void)
+{
+ kmem_cache_destroy(rds_tcp_incoming_slab);
+}
--- /dev/null
+/*
+ * Copyright (c) 2006 Oracle. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses. You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ * - Redistributions of source code must retain the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer in the documentation and/or other materials
+ * provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ */
+#include <linux/kernel.h>
+#include <linux/in.h>
+#include <net/tcp.h>
+
+#include "rds.h"
+#include "tcp.h"
+
+static void rds_tcp_cork(struct socket *sock, int val)
+{
+ mm_segment_t oldfs;
+
+ oldfs = get_fs();
+ set_fs(KERNEL_DS);
+ sock->ops->setsockopt(sock, SOL_TCP, TCP_CORK, (char __user *)&val,
+ sizeof(val));
+ set_fs(oldfs);
+}
+
+void rds_tcp_xmit_prepare(struct rds_connection *conn)
+{
+ struct rds_tcp_connection *tc = conn->c_transport_data;
+
+ rds_tcp_cork(tc->t_sock, 1);
+}
+
+void rds_tcp_xmit_complete(struct rds_connection *conn)
+{
+ struct rds_tcp_connection *tc = conn->c_transport_data;
+
+ rds_tcp_cork(tc->t_sock, 0);
+}
+
+/* the core send_sem serializes this with other xmit and shutdown */
+int rds_tcp_sendmsg(struct socket *sock, void *data, unsigned int len)
+{
+ struct kvec vec = {
+ .iov_base = data,
+ .iov_len = len,
+ };
+ struct msghdr msg = {
+ .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL,
+ };
+
+ return kernel_sendmsg(sock, &msg, &vec, 1, vec.iov_len);
+}
+
+/* the core send_sem serializes this with other xmit and shutdown */
+int rds_tcp_xmit_cong_map(struct rds_connection *conn,
+ struct rds_cong_map *map, unsigned long offset)
+{
+ static struct rds_header rds_tcp_map_header = {
+ .h_flags = RDS_FLAG_CONG_BITMAP,
+ };
+ struct rds_tcp_connection *tc = conn->c_transport_data;
+ unsigned long i;
+ int ret;
+ int copied = 0;
+
+ /* Some problem claims cpu_to_be32(constant) isn't a constant. */
+ rds_tcp_map_header.h_len = cpu_to_be32(RDS_CONG_MAP_BYTES);
+
+ if (offset < sizeof(struct rds_header)) {
+ ret = rds_tcp_sendmsg(tc->t_sock,
+ (void *)&rds_tcp_map_header + offset,
+ sizeof(struct rds_header) - offset);
+ if (ret <= 0)
+ return ret;
+ offset += ret;
+ copied = ret;
+ if (offset < sizeof(struct rds_header))
+ return ret;
+ }
+
+ offset -= sizeof(struct rds_header);
+ i = offset / PAGE_SIZE;
+ offset = offset % PAGE_SIZE;
+ BUG_ON(i >= RDS_CONG_MAP_PAGES);
+
+ do {
+ ret = tc->t_sock->ops->sendpage(tc->t_sock,
+ virt_to_page(map->m_page_addrs[i]),
+ offset, PAGE_SIZE - offset,
+ MSG_DONTWAIT);
+ if (ret <= 0)
+ break;
+ copied += ret;
+ offset += ret;
+ if (offset == PAGE_SIZE) {
+ offset = 0;
+ i++;
+ }
+ } while (i < RDS_CONG_MAP_PAGES);
+
+ return copied ? copied : ret;
+}
+
+/* the core send_sem serializes this with other xmit and shutdown */
+int rds_tcp_xmit(struct rds_connection *conn, struct rds_message *rm,
+ unsigned int hdr_off, unsigned int sg, unsigned int off)
+{
+ struct rds_tcp_connection *tc = conn->c_transport_data;
+ int done = 0;
+ int ret = 0;
+
+ if (hdr_off == 0) {
+ /*
+ * m_ack_seq is set to the sequence number of the last byte of
+ * header and data. see rds_tcp_is_acked().
+ */
+ tc->t_last_sent_nxt = rds_tcp_snd_nxt(tc);
+ rm->m_ack_seq = tc->t_last_sent_nxt +
+ sizeof(struct rds_header) +
+ be32_to_cpu(rm->m_inc.i_hdr.h_len) - 1;
+ smp_mb__before_clear_bit();
+ set_bit(RDS_MSG_HAS_ACK_SEQ, &rm->m_flags);
+ tc->t_last_expected_una = rm->m_ack_seq + 1;
+
+ rdsdebug("rm %p tcp nxt %u ack_seq %llu\n",
+ rm, rds_tcp_snd_nxt(tc),
+ (unsigned long long)rm->m_ack_seq);
+ }
+
+ if (hdr_off < sizeof(struct rds_header)) {
+ /* see rds_tcp_write_space() */
+ set_bit(SOCK_NOSPACE, &tc->t_sock->sk->sk_socket->flags);
+
+ ret = rds_tcp_sendmsg(tc->t_sock,
+ (void *)&rm->m_inc.i_hdr + hdr_off,
+ sizeof(rm->m_inc.i_hdr) - hdr_off);
+ if (ret < 0)
+ goto out;
+ done += ret;
+ if (hdr_off + done != sizeof(struct rds_header))
+ goto out;
+ }
+
+ while (sg < rm->m_nents) {
+ ret = tc->t_sock->ops->sendpage(tc->t_sock,
+ sg_page(&rm->m_sg[sg]),
+ rm->m_sg[sg].offset + off,
+ rm->m_sg[sg].length - off,
+ MSG_DONTWAIT|MSG_NOSIGNAL);
+ rdsdebug("tcp sendpage %p:%u:%u ret %d\n", (void *)sg_page(&rm->m_sg[sg]),
+ rm->m_sg[sg].offset + off, rm->m_sg[sg].length - off,
+ ret);
+ if (ret <= 0)
+ break;
+
+ off += ret;
+ done += ret;
+ if (off == rm->m_sg[sg].length) {
+ off = 0;
+ sg++;
+ }
+ }
+
+out:
+ if (ret <= 0) {
+ /* write_space will hit after EAGAIN, all else fatal */
+ if (ret == -EAGAIN) {
+ rds_tcp_stats_inc(s_tcp_sndbuf_full);
+ ret = 0;
+ } else {
+ printk(KERN_WARNING "RDS/tcp: send to %u.%u.%u.%u "
+ "returned %d, disconnecting and reconnecting\n",
+ NIPQUAD(conn->c_faddr), ret);
+ rds_conn_drop(conn);
+ }
+ }
+ if (done == 0)
+ done = ret;
+ return done;
+}
+
+/*
+ * rm->m_ack_seq is set to the tcp sequence number that corresponds to the
+ * last byte of the message, including the header. This means that the
+ * entire message has been received if rm->m_ack_seq is "before" the next
+ * unacked byte of the TCP sequence space. We have to do very careful
+ * wrapping 32bit comparisons here.
+ */
+static int rds_tcp_is_acked(struct rds_message *rm, uint64_t ack)
+{
+ if (!test_bit(RDS_MSG_HAS_ACK_SEQ, &rm->m_flags))
+ return 0;
+ return (__s32)((u32)rm->m_ack_seq - (u32)ack) < 0;
+}
+
+void rds_tcp_write_space(struct sock *sk)
+{
+ void (*write_space)(struct sock *sk);
+ struct rds_connection *conn;
+ struct rds_tcp_connection *tc;
+
+ read_lock(&sk->sk_callback_lock);
+ conn = sk->sk_user_data;
+ if (conn == NULL) {
+ write_space = sk->sk_write_space;
+ goto out;
+ }
+
+ tc = conn->c_transport_data;
+ rdsdebug("write_space for tc %p\n", tc);
+ write_space = tc->t_orig_write_space;
+ rds_tcp_stats_inc(s_tcp_write_space_calls);
+
+ rdsdebug("tcp una %u\n", rds_tcp_snd_una(tc));
+ tc->t_last_seen_una = rds_tcp_snd_una(tc);
+ rds_send_drop_acked(conn, rds_tcp_snd_una(tc), rds_tcp_is_acked);
+
+ queue_delayed_work(rds_wq, &conn->c_send_w, 0);
+out:
+ read_unlock(&sk->sk_callback_lock);
+
+ /*
+ * write_space is only called when data leaves tcp's send queue if
+ * SOCK_NOSPACE is set. We set SOCK_NOSPACE every time we put
+ * data in tcp's send queue because we use write_space to parse the
+ * sequence numbers and notice that rds messages have been fully
+ * received.
+ *
+ * tcp's write_space clears SOCK_NOSPACE if the send queue has more
+ * than a certain amount of space. So we need to set it again *after*
+ * we call tcp's write_space or else we might only get called on the
+ * first of a series of incoming tcp acks.
+ */
+ write_space(sk);
+
+ if (sk->sk_socket)
+ set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
+}
--- /dev/null
+/*
+ * Copyright (c) 2006 Oracle. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses. You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ * - Redistributions of source code must retain the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer in the documentation and/or other materials
+ * provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ */
+#include <linux/percpu.h>
+#include <linux/seq_file.h>
+#include <linux/proc_fs.h>
+
+#include "rds.h"
+#include "tcp.h"
+
+DEFINE_PER_CPU(struct rds_tcp_statistics, rds_tcp_stats)
+ ____cacheline_aligned;
+
+static const char const *rds_tcp_stat_names[] = {
+ "tcp_data_ready_calls",
+ "tcp_write_space_calls",
+ "tcp_sndbuf_full",
+ "tcp_connect_raced",
+ "tcp_listen_closed_stale",
+};
+
+unsigned int rds_tcp_stats_info_copy(struct rds_info_iterator *iter,
+ unsigned int avail)
+{
+ struct rds_tcp_statistics stats = {0, };
+ uint64_t *src;
+ uint64_t *sum;
+ size_t i;
+ int cpu;
+
+ if (avail < ARRAY_SIZE(rds_tcp_stat_names))
+ goto out;
+
+ for_each_online_cpu(cpu) {
+ src = (uint64_t *)&(per_cpu(rds_tcp_stats, cpu));
+ sum = (uint64_t *)&stats;
+ for (i = 0; i < sizeof(stats) / sizeof(uint64_t); i++)
+ *(sum++) += *(src++);
+ }
+
+ rds_stats_info_copy(iter, (uint64_t *)&stats, rds_tcp_stat_names,
+ ARRAY_SIZE(rds_tcp_stat_names));
+out:
+ return ARRAY_SIZE(rds_tcp_stat_names);
+}
git://ftp.safe.ca / safe / jmp / linux-2.6 / commitdiff