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rxrpc: Kill off the rxrpc_transport struct

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The rxrpc_transport struct is now redundant, given that the rxrpc_peer
struct is now per peer port rather than per peer host, so get rid of it.

Service connection lists are transferred to the rxrpc_peer struct, as is
the conn_lock.  Previous patches moved the client connection handling out
of the rxrpc_transport struct and discarded the connection bundling code.

Signed-off-by: David Howells <dhowells@redhat.com>
This commit is contained in:
David Howells 2016-06-17 10:06:56 +01:00
parent 999b69f892
commit aa390bbe21
11 changed files with 65 additions and 451 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
net/rxrpc/Makefile
View File

@ -22,7 +22,6 @@ af-rxrpc-y := \
recvmsg.o \
security.o \
skbuff.o \
transport.o \
utils.o
af-rxrpc-$(CONFIG_PROC_FS) += proc.o

46
net/rxrpc/af_rxrpc.c
View File

@ -224,37 +224,6 @@ static int rxrpc_listen(struct socket *sock, int backlog)
return ret;
}
/*
* find a transport by address
*/
struct rxrpc_transport *
rxrpc_name_to_transport(struct rxrpc_conn_parameters *cp,
struct sockaddr *addr,
int addr_len,
gfp_t gfp)
{
struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *) addr;
struct rxrpc_transport *trans;
_enter("%p,%d", addr, addr_len);
if (cp->local->srx.transport_type != srx->transport_type)
return ERR_PTR(-ESOCKTNOSUPPORT);
if (cp->local->srx.transport.family != srx->transport.family)
return ERR_PTR(-EAFNOSUPPORT);
/* find a remote transport endpoint from the local one */
cp->peer = rxrpc_lookup_peer(cp->local, srx, gfp);
if (!cp->peer)
return ERR_PTR(-ENOMEM);
/* find a transport */
trans = rxrpc_get_transport(cp->local, cp->peer, gfp);
rxrpc_put_peer(cp->peer);
_leave(" = %p", trans);
return trans;
}
/**
* rxrpc_kernel_begin_call - Allow a kernel service to begin a call
* @sock: The socket on which to make the call
@ -276,7 +245,6 @@ struct rxrpc_call *rxrpc_kernel_begin_call(struct socket *sock,
gfp_t gfp)
{
struct rxrpc_conn_parameters cp;
struct rxrpc_transport *trans;
struct rxrpc_call *call;
struct rxrpc_sock *rx = rxrpc_sk(sock->sk);
int ret;
@ -300,19 +268,8 @@ struct rxrpc_call *rxrpc_kernel_begin_call(struct socket *sock,
cp.security_level = 0;
cp.exclusive = false;
cp.service_id = srx->srx_service;
call = rxrpc_new_client_call(rx, &cp, srx, user_call_ID, gfp);
trans = rxrpc_name_to_transport(&cp, (struct sockaddr *)srx,
sizeof(*srx), gfp);
if (IS_ERR(trans)) {
call = ERR_CAST(trans);
trans = NULL;
goto out_notrans;
}
cp.peer = trans->peer;
call = rxrpc_new_client_call(rx, &cp, trans, srx, user_call_ID, gfp);
rxrpc_put_transport(trans);
out_notrans:
release_sock(&rx->sk);
_leave(" = %p", call);
return call;
@ -831,7 +788,6 @@ static void __exit af_rxrpc_exit(void)
proto_unregister(&rxrpc_proto);
rxrpc_destroy_all_calls();
rxrpc_destroy_all_connections();
rxrpc_destroy_all_transports();
ASSERTCMP(atomic_read(&rxrpc_n_skbs), ==, 0);

57
net/rxrpc/ar-internal.h
View File

@ -207,6 +207,8 @@ struct rxrpc_peer {
struct rxrpc_local *local;
struct hlist_head error_targets; /* targets for net error distribution */
struct work_struct error_distributor;
struct rb_root service_conns; /* Service connections */
rwlock_t conn_lock;
spinlock_t lock; /* access lock */
unsigned int if_mtu; /* interface MTU for this peer */
unsigned int mtu; /* network MTU for this peer */
@ -225,22 +227,6 @@ struct rxrpc_peer {
suseconds_t rtt_cache[RXRPC_RTT_CACHE_SIZE]; /* calculated RTT cache */
};
/*
* RxRPC point-to-point transport / connection manager definition
* - handles a bundle of connections between two endpoints
* - matched by { local, peer }
*/
struct rxrpc_transport {
struct rxrpc_local *local; /* local transport endpoint */
struct rxrpc_peer *peer; /* remote transport endpoint */
struct rb_root server_conns; /* server connections on this transport */
struct list_head link; /* link in master session list */
unsigned long put_time; /* time at which to reap */
rwlock_t conn_lock; /* lock for active/dead connections */
atomic_t usage;
int debug_id; /* debug ID for printks */
};
/*
* Keys for matching a connection.
*/
@ -271,11 +257,10 @@ struct rxrpc_conn_parameters {
/*
* RxRPC connection definition
* - matched by { transport, service_id, conn_id, direction, key }
* - matched by { local, peer, epoch, conn_id, direction }
* - each connection can only handle four simultaneous calls
*/
struct rxrpc_connection {
struct rxrpc_transport *trans; /* transport session */
struct rxrpc_conn_proto proto;
struct rxrpc_conn_parameters params;
@ -286,7 +271,7 @@ struct rxrpc_connection {
struct work_struct processor; /* connection event processor */
union {
struct rb_node client_node; /* Node in local->client_conns */
struct rb_node service_node; /* Node in trans->server_conns */
struct rb_node service_node; /* Node in peer->service_conns */
};
struct list_head link; /* link in master connection list */
struct rb_root calls; /* calls on this connection */
@ -494,10 +479,6 @@ extern u32 rxrpc_epoch;
extern atomic_t rxrpc_debug_id;
extern struct workqueue_struct *rxrpc_workqueue;
extern struct rxrpc_transport *rxrpc_name_to_transport(struct rxrpc_conn_parameters *,
struct sockaddr *,
int, gfp_t);
/*
* call_accept.c
*/
@ -526,7 +507,6 @@ struct rxrpc_call *rxrpc_find_call_hash(struct rxrpc_host_header *,
struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *, unsigned long);
struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *,
struct rxrpc_conn_parameters *,
struct rxrpc_transport *,
struct sockaddr_rxrpc *,
unsigned long, gfp_t);
struct rxrpc_call *rxrpc_incoming_call(struct rxrpc_sock *,
@ -560,15 +540,16 @@ extern struct list_head rxrpc_connections;
extern rwlock_t rxrpc_connection_lock;
int rxrpc_connect_call(struct rxrpc_call *, struct rxrpc_conn_parameters *,
struct rxrpc_transport *,
struct sockaddr_rxrpc *, gfp_t);
struct rxrpc_connection *rxrpc_find_connection(struct rxrpc_local *,
struct rxrpc_peer *,
struct sk_buff *);
void rxrpc_disconnect_call(struct rxrpc_call *);
void rxrpc_put_connection(struct rxrpc_connection *);
void __exit rxrpc_destroy_all_connections(void);
struct rxrpc_connection *rxrpc_find_connection(struct rxrpc_transport *,
struct sk_buff *);
extern struct rxrpc_connection *
rxrpc_incoming_connection(struct rxrpc_transport *, struct sk_buff *);
struct rxrpc_connection *rxrpc_incoming_connection(struct rxrpc_local *,
struct rxrpc_peer *,
struct sk_buff *);
static inline bool rxrpc_conn_is_client(const struct rxrpc_connection *conn)
{
@ -585,12 +566,6 @@ static inline void rxrpc_get_connection(struct rxrpc_connection *conn)
atomic_inc(&conn->usage);
}
static inline
struct rxrpc_connection *rxrpc_get_connection_maybe(struct rxrpc_connection *conn)
{
return atomic_inc_not_zero(&conn->usage) ? conn : NULL;
}
/*
* input.c
*/
@ -744,18 +719,6 @@ static inline int __init rxrpc_sysctl_init(void) { return 0; }
static inline void rxrpc_sysctl_exit(void) {}
#endif
/*
* transport.c
*/
extern unsigned int rxrpc_transport_expiry;
struct rxrpc_transport *rxrpc_get_transport(struct rxrpc_local *,
struct rxrpc_peer *, gfp_t);
void rxrpc_put_transport(struct rxrpc_transport *);
void __exit rxrpc_destroy_all_transports(void);
struct rxrpc_transport *rxrpc_find_transport(struct rxrpc_local *,
struct rxrpc_peer *);
/*
* utils.c
*/

11
net/rxrpc/call_accept.c
View File

@ -74,7 +74,6 @@ static int rxrpc_accept_incoming_call(struct rxrpc_local *local,
struct sockaddr_rxrpc *srx)
{
struct rxrpc_connection *conn;
struct rxrpc_transport *trans;
struct rxrpc_skb_priv *sp, *nsp;
struct rxrpc_peer *peer;
struct rxrpc_call *call;
@ -102,16 +101,8 @@ static int rxrpc_accept_incoming_call(struct rxrpc_local *local,
goto error;
}
trans = rxrpc_get_transport(local, peer, GFP_NOIO);
conn = rxrpc_incoming_connection(local, peer, skb);
rxrpc_put_peer(peer);
if (IS_ERR(trans)) {
_debug("no trans");
ret = -EBUSY;
goto error;
}
conn = rxrpc_incoming_connection(trans, skb);
rxrpc_put_transport(trans);
if (IS_ERR(conn)) {
_debug("no conn");
ret = PTR_ERR(conn);

16
net/rxrpc/call_object.c
View File

@ -286,11 +286,9 @@ static struct rxrpc_call *rxrpc_alloc_call(gfp_t gfp)
/*
* Allocate a new client call.
*/
static struct rxrpc_call *rxrpc_alloc_client_call(
struct rxrpc_sock *rx,
struct rxrpc_conn_parameters *cp,
struct sockaddr_rxrpc *srx,
gfp_t gfp)
static struct rxrpc_call *rxrpc_alloc_client_call(struct rxrpc_sock *rx,
struct sockaddr_rxrpc *srx,
gfp_t gfp)
{
struct rxrpc_call *call;
@ -333,7 +331,6 @@ static struct rxrpc_call *rxrpc_alloc_client_call(
*/
static int rxrpc_begin_client_call(struct rxrpc_call *call,
struct rxrpc_conn_parameters *cp,
struct rxrpc_transport *trans,
struct sockaddr_rxrpc *srx,
gfp_t gfp)
{
@ -342,7 +339,7 @@ static int rxrpc_begin_client_call(struct rxrpc_call *call,
/* Set up or get a connection record and set the protocol parameters,
* including channel number and call ID.
*/
ret = rxrpc_connect_call(call, cp, trans, srx, gfp);
ret = rxrpc_connect_call(call, cp, srx, gfp);
if (ret < 0)
return ret;
@ -366,7 +363,6 @@ static int rxrpc_begin_client_call(struct rxrpc_call *call,
*/
struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *rx,
struct rxrpc_conn_parameters *cp,
struct rxrpc_transport *trans,
struct sockaddr_rxrpc *srx,
unsigned long user_call_ID,
gfp_t gfp)
@ -377,7 +373,7 @@ struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *rx,
_enter("%p,%lx", rx, user_call_ID);
call = rxrpc_alloc_client_call(rx, cp, srx, gfp);
call = rxrpc_alloc_client_call(rx, srx, gfp);
if (IS_ERR(call)) {
_leave(" = %ld", PTR_ERR(call));
return call;
@ -413,7 +409,7 @@ struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *rx,
list_add_tail(&call->link, &rxrpc_calls);
write_unlock_bh(&rxrpc_call_lock);
ret = rxrpc_begin_client_call(call, cp, trans, srx, gfp);
ret = rxrpc_begin_client_call(call, cp, srx, gfp);
if (ret < 0)
goto error;

78
net/rxrpc/conn_object.c
View File

@ -100,9 +100,7 @@ static void rxrpc_add_call_ID_to_conn(struct rxrpc_connection *conn,
* padding bytes in *cp.
*/
static struct rxrpc_connection *
rxrpc_alloc_client_connection(struct rxrpc_conn_parameters *cp,
struct rxrpc_transport *trans,
gfp_t gfp)
rxrpc_alloc_client_connection(struct rxrpc_conn_parameters *cp, gfp_t gfp)
{
struct rxrpc_connection *conn;
int ret;
@ -146,9 +144,10 @@ rxrpc_alloc_client_connection(struct rxrpc_conn_parameters *cp,
list_add_tail(&conn->link, &rxrpc_connections);
write_unlock(&rxrpc_connection_lock);
/* We steal the caller's peer ref. */
cp->peer = NULL;
rxrpc_get_local(conn->params.local);
key_get(conn->params.key);
conn->trans = trans;
atomic_inc(&trans->usage);
_leave(" = %p", conn);
return conn;
@ -167,7 +166,6 @@ error_0:
*/
int rxrpc_connect_call(struct rxrpc_call *call,
struct rxrpc_conn_parameters *cp,
struct rxrpc_transport *trans,
struct sockaddr_rxrpc *srx,
gfp_t gfp)
{
@ -181,8 +179,9 @@ int rxrpc_connect_call(struct rxrpc_call *call,
_enter("{%d,%lx},", call->debug_id, call->user_call_ID);
cp->peer = trans->peer;
rxrpc_get_peer(cp->peer);
cp->peer = rxrpc_lookup_peer(cp->local, srx, gfp);
if (!cp->peer)
return -ENOMEM;
if (!cp->exclusive) {
/* Search for a existing client connection unless this is going
@ -210,7 +209,7 @@ int rxrpc_connect_call(struct rxrpc_call *call,
/* We didn't find a connection or we want an exclusive one. */
_debug("get new conn");
candidate = rxrpc_alloc_client_connection(cp, trans, gfp);
candidate = rxrpc_alloc_client_connection(cp, gfp);
if (!candidate) {
_leave(" = -ENOMEM");
return -ENOMEM;
@ -281,6 +280,8 @@ found_channel:
rxrpc_add_call_ID_to_conn(conn, call);
spin_unlock(&conn->channel_lock);
rxrpc_put_peer(cp->peer);
cp->peer = NULL;
_leave(" = %p {u=%d}", conn, atomic_read(&conn->usage));
return 0;
@ -329,6 +330,8 @@ interrupted:
remove_wait_queue(&conn->channel_wq, &myself);
__set_current_state(TASK_RUNNING);
rxrpc_put_connection(conn);
rxrpc_put_peer(cp->peer);
cp->peer = NULL;
_leave(" = -ERESTARTSYS");
return -ERESTARTSYS;
}
@ -336,7 +339,8 @@ interrupted:
/*
* get a record of an incoming connection
*/
struct rxrpc_connection *rxrpc_incoming_connection(struct rxrpc_transport *trans,
struct rxrpc_connection *rxrpc_incoming_connection(struct rxrpc_local *local,
struct rxrpc_peer *peer,
struct sk_buff *skb)
{
struct rxrpc_connection *conn, *candidate = NULL;
@ -354,9 +358,9 @@ struct rxrpc_connection *rxrpc_incoming_connection(struct rxrpc_transport *trans
cid = sp->hdr.cid & RXRPC_CIDMASK;
/* search the connection list first */
read_lock_bh(&trans->conn_lock);
read_lock_bh(&peer->conn_lock);
p = trans->server_conns.rb_node;
p = peer->service_conns.rb_node;
while (p) {
conn = rb_entry(p, struct rxrpc_connection, service_node);
@ -373,7 +377,7 @@ struct rxrpc_connection *rxrpc_incoming_connection(struct rxrpc_transport *trans
else
goto found_extant_connection;
}
read_unlock_bh(&trans->conn_lock);
read_unlock_bh(&peer->conn_lock);
/* not yet present - create a candidate for a new record and then
* redo the search */
@ -383,13 +387,12 @@ struct rxrpc_connection *rxrpc_incoming_connection(struct rxrpc_transport *trans
return ERR_PTR(-ENOMEM);
}
candidate->trans = trans;
candidate->proto.local = trans->local;
candidate->proto.local = local;
candidate->proto.epoch = sp->hdr.epoch;
candidate->proto.cid = sp->hdr.cid & RXRPC_CIDMASK;
candidate->proto.in_clientflag = RXRPC_CLIENT_INITIATED;
candidate->params.local = trans->local;
candidate->params.peer = trans->peer;
candidate->params.local = local;
candidate->params.peer = peer;
candidate->params.service_id = sp->hdr.serviceId;
candidate->security_ix = sp->hdr.securityIndex;
candidate->out_clientflag = 0;
@ -397,9 +400,9 @@ struct rxrpc_connection *rxrpc_incoming_connection(struct rxrpc_transport *trans
if (candidate->params.service_id)
candidate->state = RXRPC_CONN_SERVER_UNSECURED;
write_lock_bh(&trans->conn_lock);
write_lock_bh(&peer->conn_lock);
pp = &trans->server_conns.rb_node;
pp = &peer->service_conns.rb_node;
p = NULL;
while (*pp) {
p = *pp;
@ -421,10 +424,11 @@ struct rxrpc_connection *rxrpc_incoming_connection(struct rxrpc_transport *trans
conn = candidate;
candidate = NULL;
rb_link_node(&conn->service_node, p, pp);
rb_insert_color(&conn->service_node, &trans->server_conns);
atomic_inc(&conn->trans->usage);
rb_insert_color(&conn->service_node, &peer->service_conns);
rxrpc_get_peer(peer);
rxrpc_get_local(local);
write_unlock_bh(&trans->conn_lock);
write_unlock_bh(&peer->conn_lock);
write_lock(&rxrpc_connection_lock);
list_add_tail(&conn->link, &rxrpc_connections);
@ -441,21 +445,21 @@ success:
/* we found the connection in the list immediately */
found_extant_connection:
if (sp->hdr.securityIndex != conn->security_ix) {
read_unlock_bh(&trans->conn_lock);
read_unlock_bh(&peer->conn_lock);
goto security_mismatch;
}
rxrpc_get_connection(conn);
read_unlock_bh(&trans->conn_lock);
read_unlock_bh(&peer->conn_lock);
goto success;
/* we found the connection on the second time through the list */
found_extant_second:
if (sp->hdr.securityIndex != conn->security_ix) {
write_unlock_bh(&trans->conn_lock);
write_unlock_bh(&peer->conn_lock);
goto security_mismatch;
}
rxrpc_get_connection(conn);
write_unlock_bh(&trans->conn_lock);
write_unlock_bh(&peer->conn_lock);
kfree(candidate);
goto success;
@ -469,7 +473,8 @@ security_mismatch:
* find a connection based on transport and RxRPC connection ID for an incoming
* packet
*/
struct rxrpc_connection *rxrpc_find_connection(struct rxrpc_transport *trans,
struct rxrpc_connection *rxrpc_find_connection(struct rxrpc_local *local,
struct rxrpc_peer *peer,
struct sk_buff *skb)
{
struct rxrpc_connection *conn;
@ -479,13 +484,13 @@ struct rxrpc_connection *rxrpc_find_connection(struct rxrpc_transport *trans,
_enter(",{%x,%x}", sp->hdr.cid, sp->hdr.flags);
read_lock_bh(&trans->conn_lock);
read_lock_bh(&peer->conn_lock);
cid = sp->hdr.cid & RXRPC_CIDMASK;
epoch = sp->hdr.epoch;
if (sp->hdr.flags & RXRPC_CLIENT_INITIATED) {
p = trans->server_conns.rb_node;
p = peer->service_conns.rb_node;
while (p) {
conn = rb_entry(p, struct rxrpc_connection, service_node);
@ -508,13 +513,13 @@ struct rxrpc_connection *rxrpc_find_connection(struct rxrpc_transport *trans,
goto found;
}
read_unlock_bh(&trans->conn_lock);
read_unlock_bh(&peer->conn_lock);
_leave(" = NULL");
return NULL;
found:
rxrpc_get_connection(conn);
read_unlock_bh(&trans->conn_lock);
read_unlock_bh(&peer->conn_lock);
_leave(" = %p", conn);
return conn;
}
@ -576,8 +581,9 @@ static void rxrpc_destroy_connection(struct rxrpc_connection *conn)
conn->security->clear(conn);
key_put(conn->params.key);
key_put(conn->server_key);
rxrpc_put_peer(conn->params.peer);
rxrpc_put_local(conn->params.local);
rxrpc_put_transport(conn->trans);
kfree(conn);
_leave("");
}
@ -588,6 +594,7 @@ static void rxrpc_destroy_connection(struct rxrpc_connection *conn)
static void rxrpc_connection_reaper(struct work_struct *work)
{
struct rxrpc_connection *conn, *_p;
struct rxrpc_peer *peer;
unsigned long now, earliest, reap_time;
LIST_HEAD(graveyard);
@ -624,7 +631,8 @@ static void rxrpc_connection_reaper(struct work_struct *work)
spin_unlock(&local->client_conns_lock);
} else {
write_lock_bh(&conn->trans->conn_lock);
peer = conn->params.peer;
write_lock_bh(&peer->conn_lock);
reap_time = conn->put_time + rxrpc_connection_expiry;
if (atomic_read(&conn->usage) > 0) {
@ -632,12 +640,12 @@ static void rxrpc_connection_reaper(struct work_struct *work)
} else if (reap_time <= now) {
list_move_tail(&conn->link, &graveyard);
rb_erase(&conn->service_node,
&conn->trans->server_conns);
&peer->service_conns);
} else if (reap_time < earliest) {
earliest = reap_time;
}
write_unlock_bh(&conn->trans->conn_lock);
write_unlock_bh(&peer->conn_lock);
}
}
write_unlock(&rxrpc_connection_lock);

8
net/rxrpc/input.c
View File

@ -631,7 +631,6 @@ static struct rxrpc_connection *rxrpc_conn_from_local(struct rxrpc_local *local,
struct sk_buff *skb)
{
struct rxrpc_peer *peer;
struct rxrpc_transport *trans;
struct rxrpc_connection *conn;
struct sockaddr_rxrpc srx;
@ -641,13 +640,8 @@ static struct rxrpc_connection *rxrpc_conn_from_local(struct rxrpc_local *local,
if (!peer)
goto cant_find_peer;
trans = rxrpc_find_transport(local, peer);
conn = rxrpc_find_connection(local, peer, skb);
rcu_read_unlock();
if (!trans)
goto cant_find_conn;
conn = rxrpc_find_connection(trans, skb);
rxrpc_put_transport(trans);
if (!conn)
goto cant_find_conn;

24
net/rxrpc/output.c
View File

@ -140,10 +140,8 @@ rxrpc_new_client_call_for_sendmsg(struct rxrpc_sock *rx, struct msghdr *msg,
unsigned long user_call_ID, bool exclusive)
{
struct rxrpc_conn_parameters cp;
struct rxrpc_transport *trans;
struct rxrpc_call *call;
struct key *key;
long ret;
DECLARE_SOCKADDR(struct sockaddr_rxrpc *, srx, msg->msg_name);
@ -162,30 +160,10 @@ rxrpc_new_client_call_for_sendmsg(struct rxrpc_sock *rx, struct msghdr *msg,
cp.security_level = rx->min_sec_level;
cp.exclusive = rx->exclusive | exclusive;
cp.service_id = srx->srx_service;
trans = rxrpc_name_to_transport(&cp, msg->msg_name, msg->msg_namelen,
GFP_KERNEL);
if (IS_ERR(trans)) {
ret = PTR_ERR(trans);
goto out;
}
cp.peer = trans->peer;
call = rxrpc_new_client_call(rx, &cp, trans, srx, user_call_ID,
GFP_KERNEL);
rxrpc_put_transport(trans);
if (IS_ERR(call)) {
ret = PTR_ERR(call);
goto out_trans;
}
call = rxrpc_new_client_call(rx, &cp, srx, user_call_ID, GFP_KERNEL);
_leave(" = %p\n", call);
return call;
out_trans:
rxrpc_put_transport(trans);
out:
_leave(" = %ld", ret);
return ERR_PTR(ret);
}
/*

2
net/rxrpc/peer_object.c
View File

@ -188,6 +188,8 @@ struct rxrpc_peer *rxrpc_alloc_peer(struct rxrpc_local *local, gfp_t gfp)
INIT_HLIST_HEAD(&peer->error_targets);
INIT_WORK(&peer->error_distributor,
&rxrpc_peer_error_distributor);
peer->service_conns = RB_ROOT;
rwlock_init(&peer->conn_lock);
spin_lock_init(&peer->lock);
peer->debug_id = atomic_inc_return(&rxrpc_debug_id);
}

8
net/rxrpc/sysctl.c
View File

@ -90,14 +90,6 @@ static struct ctl_table rxrpc_sysctl_table[] = {
.proc_handler = proc_dointvec_minmax,
.extra1 = (void *)&one,
},
{
.procname = "transport_expiry",
.data = &rxrpc_transport_expiry,
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
.extra1 = (void *)&one,
},
/* Non-time values */
{

265
net/rxrpc/transport.c
View File

@ -1,265 +0,0 @@
/* RxRPC point-to-point transport session management
*
* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/module.h>
#include <linux/net.h>
#include <linux/skbuff.h>
#include <linux/slab.h>
#include <net/sock.h>
#include <net/af_rxrpc.h>
#include "ar-internal.h"
/*
* Time after last use at which transport record is cleaned up.
*/
unsigned int rxrpc_transport_expiry = 3600 * 24;
static void rxrpc_transport_reaper(struct work_struct *work);
static LIST_HEAD(rxrpc_transports);
static DEFINE_RWLOCK(rxrpc_transport_lock);
static DECLARE_DELAYED_WORK(rxrpc_transport_reap, rxrpc_transport_reaper);
/*
* allocate a new transport session manager
*/
static struct rxrpc_transport *rxrpc_alloc_transport(struct rxrpc_local *local,
struct rxrpc_peer *peer,
gfp_t gfp)
{
struct rxrpc_transport *trans;
_enter("");
trans = kzalloc(sizeof(struct rxrpc_transport), gfp);
if (trans) {
trans->local = local;
trans->peer = peer;
INIT_LIST_HEAD(&trans->link);
trans->server_conns = RB_ROOT;
rwlock_init(&trans->conn_lock);
atomic_set(&trans->usage, 1);
trans->debug_id = atomic_inc_return(&rxrpc_debug_id);
}
_leave(" = %p", trans);
return trans;
}
/*
* obtain a transport session for the nominated endpoints
*/
struct rxrpc_transport *rxrpc_get_transport(struct rxrpc_local *local,
struct rxrpc_peer *peer,
gfp_t gfp)
{
struct rxrpc_transport *trans, *candidate;
const char *new = "old";
int usage;
_enter("{%pI4+%hu},{%pI4+%hu},",
&local->srx.transport.sin.sin_addr,
ntohs(local->srx.transport.sin.sin_port),
&peer->srx.transport.sin.sin_addr,
ntohs(peer->srx.transport.sin.sin_port));
/* search the transport list first */
read_lock_bh(&rxrpc_transport_lock);
list_for_each_entry(trans, &rxrpc_transports, link) {
if (trans->local == local && trans->peer == peer)
goto found_extant_transport;
}
read_unlock_bh(&rxrpc_transport_lock);
/* not yet present - create a candidate for a new record and then
* redo the search */
candidate = rxrpc_alloc_transport(local, peer, gfp);
if (!candidate) {
_leave(" = -ENOMEM");
return ERR_PTR(-ENOMEM);
}
write_lock_bh(&rxrpc_transport_lock);
list_for_each_entry(trans, &rxrpc_transports, link) {
if (trans->local == local && trans->peer == peer)
goto found_extant_second;
}
/* we can now add the new candidate to the list */
trans = candidate;
candidate = NULL;
usage = atomic_read(&trans->usage);
rxrpc_get_local(trans->local);
rxrpc_get_peer(trans->peer);
list_add_tail(&trans->link, &rxrpc_transports);
write_unlock_bh(&rxrpc_transport_lock);
new = "new";
success:
_net("TRANSPORT %s %d local %d -> peer %d",
new,
trans->debug_id,
trans->local->debug_id,
trans->peer->debug_id);
_leave(" = %p {u=%d}", trans, usage);
return trans;
/* we found the transport in the list immediately */
found_extant_transport:
usage = atomic_inc_return(&trans->usage);
read_unlock_bh(&rxrpc_transport_lock);
goto success;
/* we found the transport on the second time through the list */
found_extant_second:
usage = atomic_inc_return(&trans->usage);
write_unlock_bh(&rxrpc_transport_lock);
kfree(candidate);
goto success;
}
/*
* find the transport connecting two endpoints
*/
struct rxrpc_transport *rxrpc_find_transport(struct rxrpc_local *local,
struct rxrpc_peer *peer)
{
struct rxrpc_transport *trans;
_enter("{%pI4+%hu},{%pI4+%hu},",
&local->srx.transport.sin.sin_addr,
ntohs(local->srx.transport.sin.sin_port),
&peer->srx.transport.sin.sin_addr,
ntohs(peer->srx.transport.sin.sin_port));
/* search the transport list */
read_lock_bh(&rxrpc_transport_lock);
list_for_each_entry(trans, &rxrpc_transports, link) {
if (trans->local == local && trans->peer == peer)
goto found_extant_transport;
}
read_unlock_bh(&rxrpc_transport_lock);
_leave(" = NULL");
return NULL;
found_extant_transport:
atomic_inc(&trans->usage);
read_unlock_bh(&rxrpc_transport_lock);
_leave(" = %p", trans);
return trans;
}
/*
* release a transport session
*/
void rxrpc_put_transport(struct rxrpc_transport *trans)
{
_enter("%p{u=%d}", trans, atomic_read(&trans->usage));
ASSERTCMP(atomic_read(&trans->usage), >, 0);
trans->put_time = ktime_get_seconds();
if (unlikely(atomic_dec_and_test(&trans->usage))) {
_debug("zombie");
/* let the reaper determine the timeout to avoid a race with
* overextending the timeout if the reaper is running at the
* same time */
rxrpc_queue_delayed_work(&rxrpc_transport_reap, 0);
}
_leave("");
}
/*
* clean up a transport session
*/
static void rxrpc_cleanup_transport(struct rxrpc_transport *trans)
{
_net("DESTROY TRANS %d", trans->debug_id);
rxrpc_put_local(trans->local);
rxrpc_put_peer(trans->peer);
kfree(trans);
}
/*
* reap dead transports that have passed their expiry date
*/
static void rxrpc_transport_reaper(struct work_struct *work)
{
struct rxrpc_transport *trans, *_p;
unsigned long now, earliest, reap_time;
LIST_HEAD(graveyard);
_enter("");
now = ktime_get_seconds();
earliest = ULONG_MAX;
/* extract all the transports that have been dead too long */
write_lock_bh(&rxrpc_transport_lock);
list_for_each_entry_safe(trans, _p, &rxrpc_transports, link) {
_debug("reap TRANS %d { u=%d t=%ld }",
trans->debug_id, atomic_read(&trans->usage),
(long) now - (long) trans->put_time);
if (likely(atomic_read(&trans->usage) > 0))
continue;
reap_time = trans->put_time + rxrpc_transport_expiry;
if (reap_time <= now)
list_move_tail(&trans->link, &graveyard);
else if (reap_time < earliest)
earliest = reap_time;
}
write_unlock_bh(&rxrpc_transport_lock);
if (earliest != ULONG_MAX) {
_debug("reschedule reaper %ld", (long) earliest - now);
ASSERTCMP(earliest, >, now);
rxrpc_queue_delayed_work(&rxrpc_transport_reap,
(earliest - now) * HZ);
}
/* then destroy all those pulled out */
while (!list_empty(&graveyard)) {
trans = list_entry(graveyard.next, struct rxrpc_transport,
link);
list_del_init(&trans->link);
ASSERTCMP(atomic_read(&trans->usage), ==, 0);
rxrpc_cleanup_transport(trans);
}
_leave("");
}
/*
* preemptively destroy all the transport session records rather than waiting
* for them to time out
*/
void __exit rxrpc_destroy_all_transports(void)
{
_enter("");
rxrpc_transport_expiry = 0;
cancel_delayed_work(&rxrpc_transport_reap);
rxrpc_queue_delayed_work(&rxrpc_transport_reap, 0);
_leave("");
}