kernel-ark/net/tipc/port.h
Allan Stephens 05646c9110 [TIPC]: Optimize stream send routine to avoid fragmentation
This patch enhances TIPC's stream socket send routine so that
it avoids transmitting data in chunks that require fragmentation
and reassembly, thereby improving performance at both the
sending and receiving ends of the connection.

The "maximum packet size" hint that records MTU info allows
the socket to decide how big a chunk it should send; in the
event that the hint has become stale, fragmentation may still
occur, but the data will be passed correctly and the hint will
be updated in time for the following send.  Note: The 66060 byte
pseudo-MTU used for intra-node connections requires the send
routine to perform an additional check to ensure it does not
exceed TIPC"s limit of 66000 bytes of user data per chunk.

Signed-off-by: Allan Stephens <allan.stephens@windriver.com>
Signed-off-by: Jon Paul Maloy <jon.maloy@ericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2007-07-10 22:06:12 -07:00

208 lines
6.3 KiB
C

/*
* net/tipc/port.h: Include file for TIPC port code
*
* Copyright (c) 1994-2007, Ericsson AB
* Copyright (c) 2004-2007, Wind River Systems
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
* 3. Neither the names of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* Alternatively, this software may be distributed under the terms of the
* GNU General Public License ("GPL") version 2 as published by the Free
* Software Foundation.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _TIPC_PORT_H
#define _TIPC_PORT_H
#include "core.h"
#include "ref.h"
#include "net.h"
#include "msg.h"
#include "dbg.h"
#include "node_subscr.h"
/**
* struct user_port - TIPC user port (used with native API)
* @user_ref: id of user who created user port
* @usr_handle: user-specified field
* @ref: object reference to associated TIPC port
* <various callback routines>
* @uport_list: adjacent user ports in list of ports held by user
*/
struct user_port {
u32 user_ref;
void *usr_handle;
u32 ref;
tipc_msg_err_event err_cb;
tipc_named_msg_err_event named_err_cb;
tipc_conn_shutdown_event conn_err_cb;
tipc_msg_event msg_cb;
tipc_named_msg_event named_msg_cb;
tipc_conn_msg_event conn_msg_cb;
tipc_continue_event continue_event_cb;
struct list_head uport_list;
};
/**
* struct port - TIPC port structure
* @publ: TIPC port info available to privileged users
* @port_list: adjacent ports in TIPC's global list of ports
* @dispatcher: ptr to routine which handles received messages
* @wakeup: ptr to routine to call when port is no longer congested
* @user_port: ptr to user port associated with port (if any)
* @wait_list: adjacent ports in list of ports waiting on link congestion
* @congested_link: ptr to congested link port is waiting on
* @waiting_pkts:
* @sent:
* @acked:
* @publications: list of publications for port
* @pub_count: total # of publications port has made during its lifetime
* @probing_state:
* @probing_interval:
* @last_in_seqno:
* @timer_ref:
* @subscription: "node down" subscription used to terminate failed connections
*/
struct port {
struct tipc_port publ;
struct list_head port_list;
u32 (*dispatcher)(struct tipc_port *, struct sk_buff *);
void (*wakeup)(struct tipc_port *);
struct user_port *user_port;
struct list_head wait_list;
struct link *congested_link;
u32 waiting_pkts;
u32 sent;
u32 acked;
struct list_head publications;
u32 pub_count;
u32 probing_state;
u32 probing_interval;
u32 last_in_seqno;
struct timer_list timer;
struct node_subscr subscription;
};
extern spinlock_t tipc_port_list_lock;
struct port_list;
int tipc_port_recv_sections(struct port *p_ptr, u32 num_sect,
struct iovec const *msg_sect);
int tipc_port_reject_sections(struct port *p_ptr, struct tipc_msg *hdr,
struct iovec const *msg_sect, u32 num_sect,
int err);
struct sk_buff *tipc_port_get_ports(void);
struct sk_buff *port_show_stats(const void *req_tlv_area, int req_tlv_space);
void tipc_port_recv_proto_msg(struct sk_buff *buf);
void tipc_port_recv_mcast(struct sk_buff *buf, struct port_list *dp);
void tipc_port_reinit(void);
/**
* tipc_port_lock - lock port instance referred to and return its pointer
*/
static inline struct port *tipc_port_lock(u32 ref)
{
return (struct port *)tipc_ref_lock(ref);
}
/**
* tipc_port_unlock - unlock a port instance
*
* Can use pointer instead of tipc_ref_unlock() since port is already locked.
*/
static inline void tipc_port_unlock(struct port *p_ptr)
{
spin_unlock_bh(p_ptr->publ.lock);
}
static inline struct port* tipc_port_deref(u32 ref)
{
return (struct port *)tipc_ref_deref(ref);
}
static inline u32 tipc_peer_port(struct port *p_ptr)
{
return msg_destport(&p_ptr->publ.phdr);
}
static inline u32 tipc_peer_node(struct port *p_ptr)
{
return msg_destnode(&p_ptr->publ.phdr);
}
static inline int tipc_port_congested(struct port *p_ptr)
{
return((p_ptr->sent - p_ptr->acked) >= (TIPC_FLOW_CONTROL_WIN * 2));
}
/**
* tipc_port_recv_msg - receive message from lower layer and deliver to port user
*/
static inline int tipc_port_recv_msg(struct sk_buff *buf)
{
struct port *p_ptr;
struct tipc_msg *msg = buf_msg(buf);
u32 destport = msg_destport(msg);
u32 dsz = msg_data_sz(msg);
u32 err;
/* forward unresolved named message */
if (unlikely(!destport)) {
tipc_net_route_msg(buf);
return dsz;
}
/* validate destination & pass to port, otherwise reject message */
p_ptr = tipc_port_lock(destport);
if (likely(p_ptr)) {
if (likely(p_ptr->publ.connected)) {
if ((unlikely(msg_origport(msg) != tipc_peer_port(p_ptr))) ||
(unlikely(msg_orignode(msg) != tipc_peer_node(p_ptr))) ||
(unlikely(!msg_connected(msg)))) {
err = TIPC_ERR_NO_PORT;
tipc_port_unlock(p_ptr);
goto reject;
}
}
err = p_ptr->dispatcher(&p_ptr->publ, buf);
tipc_port_unlock(p_ptr);
if (likely(!err))
return dsz;
} else {
err = TIPC_ERR_NO_PORT;
}
reject:
dbg("port->rejecting, err = %x..\n",err);
return tipc_reject_msg(buf, err);
}
#endif