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bc879117d4
Currently we have tipc_disconnect and tipc_disconnect_port. It is not clear from the names alone, what they do or how they differ. It turns out that tipc_disconnect just deals with the port locking and then calls tipc_disconnect_port which does all the work. If we rename as follows: tipc_disconnect_port --> __tipc_disconnect then we will be following typical linux convention, where: __tipc_disconnect: "raw" function that does all the work. tipc_disconnect: wrapper that deals with locking and then calls the real core __tipc_disconnect function With this, the difference is immediately evident, and locking violations are more apt to be spotted by chance while working on, or even just while reading the code. On the connect side of things, we currently only have the single "tipc_connect2port" function. It does both the locking at enter/exit, and the core of the work. Pending changes will make it desireable to have the connect be a two part locking wrapper + worker function, just like the disconnect is already. Here, we make the connect look just like the updated disconnect case, for the above reason, and for consistency. In the process, we also get rid of the "2port" suffix that was on the original name, since it adds no descriptive value. On close examination, one might notice that the above connect changes implicitly move the call to tipc_link_get_max_pkt() to be within the scope of tipc_port_lock() protected region; when it was not previously. We don't see any issues with this, and it is in keeping with __tipc_connect doing the work and tipc_connect just handling the locking. Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
267 lines
9.3 KiB
C
267 lines
9.3 KiB
C
/*
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* net/tipc/port.h: Include file for TIPC port code
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*
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* Copyright (c) 1994-2007, Ericsson AB
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* Copyright (c) 2004-2007, 2010-2011, Wind River Systems
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the names of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _TIPC_PORT_H
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#define _TIPC_PORT_H
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#include "ref.h"
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#include "net.h"
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#include "msg.h"
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#include "node_subscr.h"
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#define TIPC_FLOW_CONTROL_WIN 512
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typedef void (*tipc_msg_err_event) (void *usr_handle, u32 portref,
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struct sk_buff **buf, unsigned char const *data,
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unsigned int size, int reason,
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struct tipc_portid const *attmpt_destid);
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typedef void (*tipc_named_msg_err_event) (void *usr_handle, u32 portref,
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struct sk_buff **buf, unsigned char const *data,
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unsigned int size, int reason,
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struct tipc_name_seq const *attmpt_dest);
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typedef void (*tipc_conn_shutdown_event) (void *usr_handle, u32 portref,
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struct sk_buff **buf, unsigned char const *data,
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unsigned int size, int reason);
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typedef void (*tipc_msg_event) (void *usr_handle, u32 portref,
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struct sk_buff **buf, unsigned char const *data,
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unsigned int size, unsigned int importance,
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struct tipc_portid const *origin);
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typedef void (*tipc_named_msg_event) (void *usr_handle, u32 portref,
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struct sk_buff **buf, unsigned char const *data,
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unsigned int size, unsigned int importance,
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struct tipc_portid const *orig,
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struct tipc_name_seq const *dest);
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typedef void (*tipc_conn_msg_event) (void *usr_handle, u32 portref,
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struct sk_buff **buf, unsigned char const *data,
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unsigned int size);
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typedef void (*tipc_continue_event) (void *usr_handle, u32 portref);
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/**
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* struct user_port - TIPC user port (used with native API)
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* @usr_handle: user-specified field
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* @ref: object reference to associated TIPC port
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*
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* <various callback routines>
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*/
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struct user_port {
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void *usr_handle;
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u32 ref;
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tipc_msg_err_event err_cb;
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tipc_named_msg_err_event named_err_cb;
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tipc_conn_shutdown_event conn_err_cb;
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tipc_msg_event msg_cb;
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tipc_named_msg_event named_msg_cb;
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tipc_conn_msg_event conn_msg_cb;
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tipc_continue_event continue_event_cb;
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};
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/**
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* struct tipc_port - TIPC port structure
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* @usr_handle: pointer to additional user-defined information about port
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* @lock: pointer to spinlock for controlling access to port
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* @connected: non-zero if port is currently connected to a peer port
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* @conn_type: TIPC type used when connection was established
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* @conn_instance: TIPC instance used when connection was established
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* @conn_unacked: number of unacknowledged messages received from peer port
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* @published: non-zero if port has one or more associated names
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* @congested: non-zero if cannot send because of link or port congestion
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* @max_pkt: maximum packet size "hint" used when building messages sent by port
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* @ref: unique reference to port in TIPC object registry
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* @phdr: preformatted message header used when sending messages
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* @port_list: adjacent ports in TIPC's global list of ports
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* @dispatcher: ptr to routine which handles received messages
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* @wakeup: ptr to routine to call when port is no longer congested
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* @user_port: ptr to user port associated with port (if any)
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* @wait_list: adjacent ports in list of ports waiting on link congestion
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* @waiting_pkts:
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* @sent: # of non-empty messages sent by port
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* @acked: # of non-empty message acknowledgements from connected port's peer
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* @publications: list of publications for port
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* @pub_count: total # of publications port has made during its lifetime
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* @probing_state:
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* @probing_interval:
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* @timer_ref:
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* @subscription: "node down" subscription used to terminate failed connections
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*/
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struct tipc_port {
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void *usr_handle;
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spinlock_t *lock;
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int connected;
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u32 conn_type;
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u32 conn_instance;
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u32 conn_unacked;
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int published;
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u32 congested;
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u32 max_pkt;
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u32 ref;
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struct tipc_msg phdr;
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struct list_head port_list;
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u32 (*dispatcher)(struct tipc_port *, struct sk_buff *);
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void (*wakeup)(struct tipc_port *);
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struct user_port *user_port;
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struct list_head wait_list;
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u32 waiting_pkts;
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u32 sent;
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u32 acked;
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struct list_head publications;
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u32 pub_count;
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u32 probing_state;
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u32 probing_interval;
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struct timer_list timer;
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struct tipc_node_subscr subscription;
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};
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extern spinlock_t tipc_port_list_lock;
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struct tipc_port_list;
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/*
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* TIPC port manipulation routines
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*/
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struct tipc_port *tipc_createport_raw(void *usr_handle,
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u32 (*dispatcher)(struct tipc_port *, struct sk_buff *),
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void (*wakeup)(struct tipc_port *), const u32 importance);
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int tipc_reject_msg(struct sk_buff *buf, u32 err);
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int tipc_send_buf_fast(struct sk_buff *buf, u32 destnode);
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void tipc_acknowledge(u32 port_ref, u32 ack);
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int tipc_createport(void *usr_handle,
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unsigned int importance, tipc_msg_err_event error_cb,
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tipc_named_msg_err_event named_error_cb,
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tipc_conn_shutdown_event conn_error_cb, tipc_msg_event msg_cb,
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tipc_named_msg_event named_msg_cb,
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tipc_conn_msg_event conn_msg_cb,
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tipc_continue_event continue_event_cb, u32 *portref);
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int tipc_deleteport(u32 portref);
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int tipc_portimportance(u32 portref, unsigned int *importance);
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int tipc_set_portimportance(u32 portref, unsigned int importance);
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int tipc_portunreliable(u32 portref, unsigned int *isunreliable);
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int tipc_set_portunreliable(u32 portref, unsigned int isunreliable);
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int tipc_portunreturnable(u32 portref, unsigned int *isunreturnable);
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int tipc_set_portunreturnable(u32 portref, unsigned int isunreturnable);
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int tipc_publish(u32 portref, unsigned int scope,
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struct tipc_name_seq const *name_seq);
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int tipc_withdraw(u32 portref, unsigned int scope,
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struct tipc_name_seq const *name_seq);
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int tipc_connect(u32 portref, struct tipc_portid const *port);
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int tipc_disconnect(u32 portref);
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int tipc_shutdown(u32 ref);
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/*
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* The following routines require that the port be locked on entry
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*/
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int __tipc_disconnect(struct tipc_port *tp_ptr);
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int __tipc_connect(u32 ref, struct tipc_port *p_ptr,
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struct tipc_portid const *peer);
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int tipc_port_peer_msg(struct tipc_port *p_ptr, struct tipc_msg *msg);
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/*
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* TIPC messaging routines
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*/
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int tipc_port_recv_msg(struct sk_buff *buf);
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int tipc_send(u32 portref, unsigned int num_sect, struct iovec const *msg_sect,
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unsigned int total_len);
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int tipc_send2name(u32 portref, struct tipc_name const *name, u32 domain,
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unsigned int num_sect, struct iovec const *msg_sect,
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unsigned int total_len);
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int tipc_send2port(u32 portref, struct tipc_portid const *dest,
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unsigned int num_sect, struct iovec const *msg_sect,
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unsigned int total_len);
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int tipc_send_buf2port(u32 portref, struct tipc_portid const *dest,
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struct sk_buff *buf, unsigned int dsz);
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int tipc_multicast(u32 portref, struct tipc_name_seq const *seq,
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unsigned int section_count, struct iovec const *msg,
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unsigned int total_len);
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int tipc_port_reject_sections(struct tipc_port *p_ptr, struct tipc_msg *hdr,
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struct iovec const *msg_sect, u32 num_sect,
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unsigned int total_len, int err);
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struct sk_buff *tipc_port_get_ports(void);
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void tipc_port_recv_proto_msg(struct sk_buff *buf);
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void tipc_port_recv_mcast(struct sk_buff *buf, struct tipc_port_list *dp);
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void tipc_port_reinit(void);
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/**
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* tipc_port_lock - lock port instance referred to and return its pointer
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*/
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static inline struct tipc_port *tipc_port_lock(u32 ref)
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{
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return (struct tipc_port *)tipc_ref_lock(ref);
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}
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/**
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* tipc_port_unlock - unlock a port instance
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*
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* Can use pointer instead of tipc_ref_unlock() since port is already locked.
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*/
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static inline void tipc_port_unlock(struct tipc_port *p_ptr)
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{
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spin_unlock_bh(p_ptr->lock);
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}
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static inline struct tipc_port *tipc_port_deref(u32 ref)
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{
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return (struct tipc_port *)tipc_ref_deref(ref);
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}
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static inline int tipc_port_congested(struct tipc_port *p_ptr)
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{
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return (p_ptr->sent - p_ptr->acked) >= (TIPC_FLOW_CONTROL_WIN * 2);
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}
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#endif
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