/net/tipc/link.c
C | 3367 lines | 2505 code | 462 blank | 400 comment | 474 complexity | e55de7b97d9f6de89ad4ce7530236b7b MD5 | raw file
Possible License(s): CC-BY-SA-3.0, GPL-2.0, LGPL-2.0, AGPL-1.0
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- /*
- * net/tipc/link.c: TIPC link code
- *
- * Copyright (c) 1996-2007, 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.
- */
- #include "core.h"
- #include "dbg.h"
- #include "link.h"
- #include "net.h"
- #include "node.h"
- #include "port.h"
- #include "addr.h"
- #include "node_subscr.h"
- #include "name_distr.h"
- #include "bearer.h"
- #include "name_table.h"
- #include "discover.h"
- #include "config.h"
- #include "bcast.h"
- /*
- * Out-of-range value for link session numbers
- */
- #define INVALID_SESSION 0x10000
- /*
- * Limit for deferred reception queue:
- */
- #define DEF_QUEUE_LIMIT 256u
- /*
- * Link state events:
- */
- #define STARTING_EVT 856384768 /* link processing trigger */
- #define TRAFFIC_MSG_EVT 560815u /* rx'd ??? */
- #define TIMEOUT_EVT 560817u /* link timer expired */
- /*
- * The following two 'message types' is really just implementation
- * data conveniently stored in the message header.
- * They must not be considered part of the protocol
- */
- #define OPEN_MSG 0
- #define CLOSED_MSG 1
- /*
- * State value stored in 'exp_msg_count'
- */
- #define START_CHANGEOVER 100000u
- /**
- * struct link_name - deconstructed link name
- * @addr_local: network address of node at this end
- * @if_local: name of interface at this end
- * @addr_peer: network address of node at far end
- * @if_peer: name of interface at far end
- */
- struct link_name {
- u32 addr_local;
- char if_local[TIPC_MAX_IF_NAME];
- u32 addr_peer;
- char if_peer[TIPC_MAX_IF_NAME];
- };
- #if 0
- /* LINK EVENT CODE IS NOT SUPPORTED AT PRESENT */
- /**
- * struct link_event - link up/down event notification
- */
- struct link_event {
- u32 addr;
- int up;
- void (*fcn)(u32, char *, int);
- char name[TIPC_MAX_LINK_NAME];
- };
- #endif
- static void link_handle_out_of_seq_msg(struct link *l_ptr,
- struct sk_buff *buf);
- static void link_recv_proto_msg(struct link *l_ptr, struct sk_buff *buf);
- static int link_recv_changeover_msg(struct link **l_ptr, struct sk_buff **buf);
- static void link_set_supervision_props(struct link *l_ptr, u32 tolerance);
- static int link_send_sections_long(struct port *sender,
- struct iovec const *msg_sect,
- u32 num_sect, u32 destnode);
- static void link_check_defragm_bufs(struct link *l_ptr);
- static void link_state_event(struct link *l_ptr, u32 event);
- static void link_reset_statistics(struct link *l_ptr);
- static void link_print(struct link *l_ptr, struct print_buf *buf,
- const char *str);
- /*
- * Debugging code used by link routines only
- *
- * When debugging link problems on a system that has multiple links,
- * the standard TIPC debugging routines may not be useful since they
- * allow the output from multiple links to be intermixed. For this reason
- * routines of the form "dbg_link_XXX()" have been created that will capture
- * debug info into a link's personal print buffer, which can then be dumped
- * into the TIPC system log (TIPC_LOG) upon request.
- *
- * To enable per-link debugging, use LINK_LOG_BUF_SIZE to specify the size
- * of the print buffer used by each link. If LINK_LOG_BUF_SIZE is set to 0,
- * the dbg_link_XXX() routines simply send their output to the standard
- * debug print buffer (DBG_OUTPUT), if it has been defined; this can be useful
- * when there is only a single link in the system being debugged.
- *
- * Notes:
- * - When enabled, LINK_LOG_BUF_SIZE should be set to at least TIPC_PB_MIN_SIZE
- * - "l_ptr" must be valid when using dbg_link_XXX() macros
- */
- #define LINK_LOG_BUF_SIZE 0
- #define dbg_link(fmt, arg...) \
- do { \
- if (LINK_LOG_BUF_SIZE) \
- tipc_printf(&l_ptr->print_buf, fmt, ## arg); \
- } while (0)
- #define dbg_link_msg(msg, txt) \
- do { \
- if (LINK_LOG_BUF_SIZE) \
- tipc_msg_dbg(&l_ptr->print_buf, msg, txt); \
- } while (0)
- #define dbg_link_state(txt) \
- do { \
- if (LINK_LOG_BUF_SIZE) \
- link_print(l_ptr, &l_ptr->print_buf, txt); \
- } while (0)
- #define dbg_link_dump() do { \
- if (LINK_LOG_BUF_SIZE) { \
- tipc_printf(LOG, "\n\nDumping link <%s>:\n", l_ptr->name); \
- tipc_printbuf_move(LOG, &l_ptr->print_buf); \
- } \
- } while (0)
- static void dbg_print_link(struct link *l_ptr, const char *str)
- {
- if (DBG_OUTPUT != TIPC_NULL)
- link_print(l_ptr, DBG_OUTPUT, str);
- }
- static void dbg_print_buf_chain(struct sk_buff *root_buf)
- {
- if (DBG_OUTPUT != TIPC_NULL) {
- struct sk_buff *buf = root_buf;
- while (buf) {
- msg_dbg(buf_msg(buf), "In chain: ");
- buf = buf->next;
- }
- }
- }
- /*
- * Simple link routines
- */
- static unsigned int align(unsigned int i)
- {
- return (i + 3) & ~3u;
- }
- static int link_working_working(struct link *l_ptr)
- {
- return (l_ptr->state == WORKING_WORKING);
- }
- static int link_working_unknown(struct link *l_ptr)
- {
- return (l_ptr->state == WORKING_UNKNOWN);
- }
- static int link_reset_unknown(struct link *l_ptr)
- {
- return (l_ptr->state == RESET_UNKNOWN);
- }
- static int link_reset_reset(struct link *l_ptr)
- {
- return (l_ptr->state == RESET_RESET);
- }
- static int link_blocked(struct link *l_ptr)
- {
- return (l_ptr->exp_msg_count || l_ptr->blocked);
- }
- static int link_congested(struct link *l_ptr)
- {
- return (l_ptr->out_queue_size >= l_ptr->queue_limit[0]);
- }
- static u32 link_max_pkt(struct link *l_ptr)
- {
- return l_ptr->max_pkt;
- }
- static void link_init_max_pkt(struct link *l_ptr)
- {
- u32 max_pkt;
- max_pkt = (l_ptr->b_ptr->publ.mtu & ~3);
- if (max_pkt > MAX_MSG_SIZE)
- max_pkt = MAX_MSG_SIZE;
-