![Allan Stephens](/assets/img/avatar_default.png)
This patch allows the compiler to optimize out any code that tries to send debugging output to the null print buffer (TIPC_NULL), a capability that was unintentionally broken during the recent print buffer rework. Signed-off-by: Allan Stephens <allan.stephens@windriver.com> Signed-off-by: Per Liden <per.liden@ericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>
3280 lines
85 KiB
C
3280 lines
85 KiB
C
/*
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* net/tipc/link.c: TIPC link code
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*
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* Copyright (c) 1996-2006, Ericsson AB
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* Copyright (c) 2004-2006, 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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#include "core.h"
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#include "dbg.h"
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#include "link.h"
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#include "net.h"
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#include "node.h"
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#include "port.h"
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#include "addr.h"
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#include "node_subscr.h"
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#include "name_distr.h"
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#include "bearer.h"
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#include "name_table.h"
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#include "discover.h"
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#include "config.h"
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#include "bcast.h"
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/*
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* Limit for deferred reception queue:
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*/
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#define DEF_QUEUE_LIMIT 256u
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/*
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* Link state events:
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*/
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#define STARTING_EVT 856384768 /* link processing trigger */
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#define TRAFFIC_MSG_EVT 560815u /* rx'd ??? */
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#define TIMEOUT_EVT 560817u /* link timer expired */
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/*
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* The following two 'message types' is really just implementation
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* data conveniently stored in the message header.
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* They must not be considered part of the protocol
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*/
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#define OPEN_MSG 0
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#define CLOSED_MSG 1
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/*
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* State value stored in 'exp_msg_count'
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*/
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#define START_CHANGEOVER 100000u
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/**
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* struct link_name - deconstructed link name
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* @addr_local: network address of node at this end
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* @if_local: name of interface at this end
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* @addr_peer: network address of node at far end
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* @if_peer: name of interface at far end
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*/
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struct link_name {
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u32 addr_local;
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char if_local[TIPC_MAX_IF_NAME];
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u32 addr_peer;
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char if_peer[TIPC_MAX_IF_NAME];
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};
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#if 0
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/* LINK EVENT CODE IS NOT SUPPORTED AT PRESENT */
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/**
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* struct link_event - link up/down event notification
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*/
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struct link_event {
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u32 addr;
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int up;
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void (*fcn)(u32, char *, int);
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char name[TIPC_MAX_LINK_NAME];
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};
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#endif
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static void link_handle_out_of_seq_msg(struct link *l_ptr,
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struct sk_buff *buf);
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static void link_recv_proto_msg(struct link *l_ptr, struct sk_buff *buf);
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static int link_recv_changeover_msg(struct link **l_ptr, struct sk_buff **buf);
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static void link_set_supervision_props(struct link *l_ptr, u32 tolerance);
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static int link_send_sections_long(struct port *sender,
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struct iovec const *msg_sect,
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u32 num_sect, u32 destnode);
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static void link_check_defragm_bufs(struct link *l_ptr);
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static void link_state_event(struct link *l_ptr, u32 event);
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static void link_reset_statistics(struct link *l_ptr);
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static void link_print(struct link *l_ptr, struct print_buf *buf,
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const char *str);
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/*
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* Debugging code used by link routines only
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*
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* When debugging link problems on a system that has multiple links,
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* the standard TIPC debugging routines may not be useful since they
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* allow the output from multiple links to be intermixed. For this reason
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* routines of the form "dbg_link_XXX()" have been created that will capture
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* debug info into a link's personal print buffer, which can then be dumped
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* into the TIPC system log (TIPC_LOG) upon request.
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*
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* To enable per-link debugging, use LINK_LOG_BUF_SIZE to specify the size
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* of the print buffer used by each link. If LINK_LOG_BUF_SIZE is set to 0,
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* the dbg_link_XXX() routines simply send their output to the standard
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* debug print buffer (DBG_OUTPUT), if it has been defined; this can be useful
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* when there is only a single link in the system being debugged.
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*
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* Notes:
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* - When enabled, LINK_LOG_BUF_SIZE should be set to at least TIPC_PB_MIN_SIZE
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* - "l_ptr" must be valid when using dbg_link_XXX() macros
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*/
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#define LINK_LOG_BUF_SIZE 0
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#define dbg_link(fmt, arg...) do {if (LINK_LOG_BUF_SIZE) tipc_printf(&l_ptr->print_buf, fmt, ## arg); } while(0)
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#define dbg_link_msg(msg, txt) do {if (LINK_LOG_BUF_SIZE) tipc_msg_print(&l_ptr->print_buf, msg, txt); } while(0)
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#define dbg_link_state(txt) do {if (LINK_LOG_BUF_SIZE) link_print(l_ptr, &l_ptr->print_buf, txt); } while(0)
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#define dbg_link_dump() do { \
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if (LINK_LOG_BUF_SIZE) { \
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tipc_printf(LOG, "\n\nDumping link <%s>:\n", l_ptr->name); \
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tipc_printbuf_move(LOG, &l_ptr->print_buf); \
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} \
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} while (0)
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static void dbg_print_link(struct link *l_ptr, const char *str)
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{
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if (DBG_OUTPUT != TIPC_NULL)
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link_print(l_ptr, DBG_OUTPUT, str);
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}
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static void dbg_print_buf_chain(struct sk_buff *root_buf)
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{
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if (DBG_OUTPUT != TIPC_NULL) {
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struct sk_buff *buf = root_buf;
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while (buf) {
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msg_dbg(buf_msg(buf), "In chain: ");
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buf = buf->next;
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}
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}
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}
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/*
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* Simple link routines
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*/
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static unsigned int align(unsigned int i)
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{
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return (i + 3) & ~3u;
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}
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static int link_working_working(struct link *l_ptr)
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{
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return (l_ptr->state == WORKING_WORKING);
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}
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static int link_working_unknown(struct link *l_ptr)
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{
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return (l_ptr->state == WORKING_UNKNOWN);
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}
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static int link_reset_unknown(struct link *l_ptr)
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{
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return (l_ptr->state == RESET_UNKNOWN);
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}
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static int link_reset_reset(struct link *l_ptr)
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{
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return (l_ptr->state == RESET_RESET);
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}
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static int link_blocked(struct link *l_ptr)
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{
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return (l_ptr->exp_msg_count || l_ptr->blocked);
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}
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static int link_congested(struct link *l_ptr)
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{
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return (l_ptr->out_queue_size >= l_ptr->queue_limit[0]);
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}
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static u32 link_max_pkt(struct link *l_ptr)
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{
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return l_ptr->max_pkt;
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}
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static void link_init_max_pkt(struct link *l_ptr)
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{
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u32 max_pkt;
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max_pkt = (l_ptr->b_ptr->publ.mtu & ~3);
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if (max_pkt > MAX_MSG_SIZE)
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max_pkt = MAX_MSG_SIZE;
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l_ptr->max_pkt_target = max_pkt;
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if (l_ptr->max_pkt_target < MAX_PKT_DEFAULT)
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l_ptr->max_pkt = l_ptr->max_pkt_target;
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else
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l_ptr->max_pkt = MAX_PKT_DEFAULT;
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l_ptr->max_pkt_probes = 0;
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}
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static u32 link_next_sent(struct link *l_ptr)
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{
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if (l_ptr->next_out)
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return msg_seqno(buf_msg(l_ptr->next_out));
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return mod(l_ptr->next_out_no);
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}
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static u32 link_last_sent(struct link *l_ptr)
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{
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return mod(link_next_sent(l_ptr) - 1);
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}
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/*
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* Simple non-static link routines (i.e. referenced outside this file)
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*/
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int tipc_link_is_up(struct link *l_ptr)
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{
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if (!l_ptr)
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return 0;
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return (link_working_working(l_ptr) || link_working_unknown(l_ptr));
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}
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int tipc_link_is_active(struct link *l_ptr)
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{
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return ((l_ptr->owner->active_links[0] == l_ptr) ||
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(l_ptr->owner->active_links[1] == l_ptr));
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}
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/**
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* link_name_validate - validate & (optionally) deconstruct link name
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* @name - ptr to link name string
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* @name_parts - ptr to area for link name components (or NULL if not needed)
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*
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* Returns 1 if link name is valid, otherwise 0.
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*/
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static int link_name_validate(const char *name, struct link_name *name_parts)
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{
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char name_copy[TIPC_MAX_LINK_NAME];
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char *addr_local;
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char *if_local;
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char *addr_peer;
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char *if_peer;
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char dummy;
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u32 z_local, c_local, n_local;
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u32 z_peer, c_peer, n_peer;
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u32 if_local_len;
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u32 if_peer_len;
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/* copy link name & ensure length is OK */
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name_copy[TIPC_MAX_LINK_NAME - 1] = 0;
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/* need above in case non-Posix strncpy() doesn't pad with nulls */
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strncpy(name_copy, name, TIPC_MAX_LINK_NAME);
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if (name_copy[TIPC_MAX_LINK_NAME - 1] != 0)
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return 0;
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/* ensure all component parts of link name are present */
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addr_local = name_copy;
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if ((if_local = strchr(addr_local, ':')) == NULL)
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return 0;
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*(if_local++) = 0;
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if ((addr_peer = strchr(if_local, '-')) == NULL)
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return 0;
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*(addr_peer++) = 0;
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if_local_len = addr_peer - if_local;
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if ((if_peer = strchr(addr_peer, ':')) == NULL)
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return 0;
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*(if_peer++) = 0;
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if_peer_len = strlen(if_peer) + 1;
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/* validate component parts of link name */
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if ((sscanf(addr_local, "%u.%u.%u%c",
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&z_local, &c_local, &n_local, &dummy) != 3) ||
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(sscanf(addr_peer, "%u.%u.%u%c",
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&z_peer, &c_peer, &n_peer, &dummy) != 3) ||
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(z_local > 255) || (c_local > 4095) || (n_local > 4095) ||
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(z_peer > 255) || (c_peer > 4095) || (n_peer > 4095) ||
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(if_local_len <= 1) || (if_local_len > TIPC_MAX_IF_NAME) ||
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(if_peer_len <= 1) || (if_peer_len > TIPC_MAX_IF_NAME) ||
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(strspn(if_local, tipc_alphabet) != (if_local_len - 1)) ||
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(strspn(if_peer, tipc_alphabet) != (if_peer_len - 1)))
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return 0;
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/* return link name components, if necessary */
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if (name_parts) {
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name_parts->addr_local = tipc_addr(z_local, c_local, n_local);
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strcpy(name_parts->if_local, if_local);
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name_parts->addr_peer = tipc_addr(z_peer, c_peer, n_peer);
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strcpy(name_parts->if_peer, if_peer);
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}
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return 1;
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}
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/**
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* link_timeout - handle expiration of link timer
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* @l_ptr: pointer to link
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*
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* This routine must not grab "tipc_net_lock" to avoid a potential deadlock conflict
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* with tipc_link_delete(). (There is no risk that the node will be deleted by
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* another thread because tipc_link_delete() always cancels the link timer before
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* tipc_node_delete() is called.)
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*/
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static void link_timeout(struct link *l_ptr)
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{
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tipc_node_lock(l_ptr->owner);
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/* update counters used in statistical profiling of send traffic */
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l_ptr->stats.accu_queue_sz += l_ptr->out_queue_size;
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l_ptr->stats.queue_sz_counts++;
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if (l_ptr->out_queue_size > l_ptr->stats.max_queue_sz)
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l_ptr->stats.max_queue_sz = l_ptr->out_queue_size;
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if (l_ptr->first_out) {
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struct tipc_msg *msg = buf_msg(l_ptr->first_out);
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u32 length = msg_size(msg);
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if ((msg_user(msg) == MSG_FRAGMENTER)
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&& (msg_type(msg) == FIRST_FRAGMENT)) {
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length = msg_size(msg_get_wrapped(msg));
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}
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if (length) {
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l_ptr->stats.msg_lengths_total += length;
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l_ptr->stats.msg_length_counts++;
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if (length <= 64)
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l_ptr->stats.msg_length_profile[0]++;
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else if (length <= 256)
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l_ptr->stats.msg_length_profile[1]++;
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else if (length <= 1024)
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l_ptr->stats.msg_length_profile[2]++;
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else if (length <= 4096)
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l_ptr->stats.msg_length_profile[3]++;
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else if (length <= 16384)
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l_ptr->stats.msg_length_profile[4]++;
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else if (length <= 32768)
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l_ptr->stats.msg_length_profile[5]++;
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else
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l_ptr->stats.msg_length_profile[6]++;
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}
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}
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/* do all other link processing performed on a periodic basis */
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link_check_defragm_bufs(l_ptr);
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link_state_event(l_ptr, TIMEOUT_EVT);
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if (l_ptr->next_out)
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tipc_link_push_queue(l_ptr);
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tipc_node_unlock(l_ptr->owner);
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}
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static void link_set_timer(struct link *l_ptr, u32 time)
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{
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k_start_timer(&l_ptr->timer, time);
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}
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/**
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* tipc_link_create - create a new link
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* @b_ptr: pointer to associated bearer
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* @peer: network address of node at other end of link
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* @media_addr: media address to use when sending messages over link
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*
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* Returns pointer to link.
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*/
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struct link *tipc_link_create(struct bearer *b_ptr, const u32 peer,
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const struct tipc_media_addr *media_addr)
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{
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struct link *l_ptr;
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struct tipc_msg *msg;
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char *if_name;
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l_ptr = kzalloc(sizeof(*l_ptr), GFP_ATOMIC);
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if (!l_ptr) {
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warn("Link creation failed, no memory\n");
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return NULL;
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}
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l_ptr->addr = peer;
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if_name = strchr(b_ptr->publ.name, ':') + 1;
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sprintf(l_ptr->name, "%u.%u.%u:%s-%u.%u.%u:",
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tipc_zone(tipc_own_addr), tipc_cluster(tipc_own_addr),
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tipc_node(tipc_own_addr),
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if_name,
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tipc_zone(peer), tipc_cluster(peer), tipc_node(peer));
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/* note: peer i/f is appended to link name by reset/activate */
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memcpy(&l_ptr->media_addr, media_addr, sizeof(*media_addr));
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k_init_timer(&l_ptr->timer, (Handler)link_timeout, (unsigned long)l_ptr);
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list_add_tail(&l_ptr->link_list, &b_ptr->links);
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l_ptr->checkpoint = 1;
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l_ptr->b_ptr = b_ptr;
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link_set_supervision_props(l_ptr, b_ptr->media->tolerance);
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l_ptr->state = RESET_UNKNOWN;
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l_ptr->pmsg = (struct tipc_msg *)&l_ptr->proto_msg;
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msg = l_ptr->pmsg;
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msg_init(msg, LINK_PROTOCOL, RESET_MSG, TIPC_OK, INT_H_SIZE, l_ptr->addr);
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msg_set_size(msg, sizeof(l_ptr->proto_msg));
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msg_set_session(msg, tipc_random);
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msg_set_bearer_id(msg, b_ptr->identity);
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strcpy((char *)msg_data(msg), if_name);
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l_ptr->priority = b_ptr->priority;
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tipc_link_set_queue_limits(l_ptr, b_ptr->media->window);
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link_init_max_pkt(l_ptr);
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l_ptr->next_out_no = 1;
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INIT_LIST_HEAD(&l_ptr->waiting_ports);
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link_reset_statistics(l_ptr);
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l_ptr->owner = tipc_node_attach_link(l_ptr);
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if (!l_ptr->owner) {
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kfree(l_ptr);
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return NULL;
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}
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if (LINK_LOG_BUF_SIZE) {
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char *pb = kmalloc(LINK_LOG_BUF_SIZE, GFP_ATOMIC);
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if (!pb) {
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kfree(l_ptr);
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warn("Link creation failed, no memory for print buffer\n");
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return NULL;
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}
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tipc_printbuf_init(&l_ptr->print_buf, pb, LINK_LOG_BUF_SIZE);
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}
|
|
|
|
tipc_k_signal((Handler)tipc_link_start, (unsigned long)l_ptr);
|
|
|
|
dbg("tipc_link_create(): tolerance = %u,cont intv = %u, abort_limit = %u\n",
|
|
l_ptr->tolerance, l_ptr->continuity_interval, l_ptr->abort_limit);
|
|
|
|
return l_ptr;
|
|
}
|
|
|
|
/**
|
|
* tipc_link_delete - delete a link
|
|
* @l_ptr: pointer to link
|
|
*
|
|
* Note: 'tipc_net_lock' is write_locked, bearer is locked.
|
|
* This routine must not grab the node lock until after link timer cancellation
|
|
* to avoid a potential deadlock situation.
|
|
*/
|
|
|
|
void tipc_link_delete(struct link *l_ptr)
|
|
{
|
|
if (!l_ptr) {
|
|
err("Attempt to delete non-existent link\n");
|
|
return;
|
|
}
|
|
|
|
dbg("tipc_link_delete()\n");
|
|
|
|
k_cancel_timer(&l_ptr->timer);
|
|
|
|
tipc_node_lock(l_ptr->owner);
|
|
tipc_link_reset(l_ptr);
|
|
tipc_node_detach_link(l_ptr->owner, l_ptr);
|
|
tipc_link_stop(l_ptr);
|
|
list_del_init(&l_ptr->link_list);
|
|
if (LINK_LOG_BUF_SIZE)
|
|
kfree(l_ptr->print_buf.buf);
|
|
tipc_node_unlock(l_ptr->owner);
|
|
k_term_timer(&l_ptr->timer);
|
|
kfree(l_ptr);
|
|
}
|
|
|
|
void tipc_link_start(struct link *l_ptr)
|
|
{
|
|
dbg("tipc_link_start %x\n", l_ptr);
|
|
link_state_event(l_ptr, STARTING_EVT);
|
|
}
|
|
|
|
/**
|
|
* link_schedule_port - schedule port for deferred sending
|
|
* @l_ptr: pointer to link
|
|
* @origport: reference to sending port
|
|
* @sz: amount of data to be sent
|
|
*
|
|
* Schedules port for renewed sending of messages after link congestion
|
|
* has abated.
|
|
*/
|
|
|
|
static int link_schedule_port(struct link *l_ptr, u32 origport, u32 sz)
|
|
{
|
|
struct port *p_ptr;
|
|
|
|
spin_lock_bh(&tipc_port_list_lock);
|
|
p_ptr = tipc_port_lock(origport);
|
|
if (p_ptr) {
|
|
if (!p_ptr->wakeup)
|
|
goto exit;
|
|
if (!list_empty(&p_ptr->wait_list))
|
|
goto exit;
|
|
p_ptr->congested_link = l_ptr;
|
|
p_ptr->publ.congested = 1;
|
|
p_ptr->waiting_pkts = 1 + ((sz - 1) / link_max_pkt(l_ptr));
|
|
list_add_tail(&p_ptr->wait_list, &l_ptr->waiting_ports);
|
|
l_ptr->stats.link_congs++;
|
|
exit:
|
|
tipc_port_unlock(p_ptr);
|
|
}
|
|
spin_unlock_bh(&tipc_port_list_lock);
|
|
return -ELINKCONG;
|
|
}
|
|
|
|
void tipc_link_wakeup_ports(struct link *l_ptr, int all)
|
|
{
|
|
struct port *p_ptr;
|
|
struct port *temp_p_ptr;
|
|
int win = l_ptr->queue_limit[0] - l_ptr->out_queue_size;
|
|
|
|
if (all)
|
|
win = 100000;
|
|
if (win <= 0)
|
|
return;
|
|
if (!spin_trylock_bh(&tipc_port_list_lock))
|
|
return;
|
|
if (link_congested(l_ptr))
|
|
goto exit;
|
|
list_for_each_entry_safe(p_ptr, temp_p_ptr, &l_ptr->waiting_ports,
|
|
wait_list) {
|
|
if (win <= 0)
|
|
break;
|
|
list_del_init(&p_ptr->wait_list);
|
|
p_ptr->congested_link = NULL;
|
|
spin_lock_bh(p_ptr->publ.lock);
|
|
p_ptr->publ.congested = 0;
|
|
p_ptr->wakeup(&p_ptr->publ);
|
|
win -= p_ptr->waiting_pkts;
|
|
spin_unlock_bh(p_ptr->publ.lock);
|
|
}
|
|
|
|
exit:
|
|
spin_unlock_bh(&tipc_port_list_lock);
|
|
}
|
|
|
|
/**
|
|
* link_release_outqueue - purge link's outbound message queue
|
|
* @l_ptr: pointer to link
|
|
*/
|
|
|
|
static void link_release_outqueue(struct link *l_ptr)
|
|
{
|
|
struct sk_buff *buf = l_ptr->first_out;
|
|
struct sk_buff *next;
|
|
|
|
while (buf) {
|
|
next = buf->next;
|
|
buf_discard(buf);
|
|
buf = next;
|
|
}
|
|
l_ptr->first_out = NULL;
|
|
l_ptr->out_queue_size = 0;
|
|
}
|
|
|
|
/**
|
|
* tipc_link_reset_fragments - purge link's inbound message fragments queue
|
|
* @l_ptr: pointer to link
|
|
*/
|
|
|
|
void tipc_link_reset_fragments(struct link *l_ptr)
|
|
{
|
|
struct sk_buff *buf = l_ptr->defragm_buf;
|
|
struct sk_buff *next;
|
|
|
|
while (buf) {
|
|
next = buf->next;
|
|
buf_discard(buf);
|
|
buf = next;
|
|
}
|
|
l_ptr->defragm_buf = NULL;
|
|
}
|
|
|
|
/**
|
|
* tipc_link_stop - purge all inbound and outbound messages associated with link
|
|
* @l_ptr: pointer to link
|
|
*/
|
|
|
|
void tipc_link_stop(struct link *l_ptr)
|
|
{
|
|
struct sk_buff *buf;
|
|
struct sk_buff *next;
|
|
|
|
buf = l_ptr->oldest_deferred_in;
|
|
while (buf) {
|
|
next = buf->next;
|
|
buf_discard(buf);
|
|
buf = next;
|
|
}
|
|
|
|
buf = l_ptr->first_out;
|
|
while (buf) {
|
|
next = buf->next;
|
|
buf_discard(buf);
|
|
buf = next;
|
|
}
|
|
|
|
tipc_link_reset_fragments(l_ptr);
|
|
|
|
buf_discard(l_ptr->proto_msg_queue);
|
|
l_ptr->proto_msg_queue = NULL;
|
|
}
|
|
|
|
#if 0
|
|
|
|
/* LINK EVENT CODE IS NOT SUPPORTED AT PRESENT */
|
|
|
|
static void link_recv_event(struct link_event *ev)
|
|
{
|
|
ev->fcn(ev->addr, ev->name, ev->up);
|
|
kfree(ev);
|
|
}
|
|
|
|
static void link_send_event(void (*fcn)(u32 a, char *n, int up),
|
|
struct link *l_ptr, int up)
|
|
{
|
|
struct link_event *ev;
|
|
|
|
ev = kmalloc(sizeof(*ev), GFP_ATOMIC);
|
|
if (!ev) {
|
|
warn("Link event allocation failure\n");
|
|
return;
|
|
}
|
|
ev->addr = l_ptr->addr;
|
|
ev->up = up;
|
|
ev->fcn = fcn;
|
|
memcpy(ev->name, l_ptr->name, TIPC_MAX_LINK_NAME);
|
|
tipc_k_signal((Handler)link_recv_event, (unsigned long)ev);
|
|
}
|
|
|
|
#else
|
|
|
|
#define link_send_event(fcn, l_ptr, up) do { } while (0)
|
|
|
|
#endif
|
|
|
|
void tipc_link_reset(struct link *l_ptr)
|
|
{
|
|
struct sk_buff *buf;
|
|
u32 prev_state = l_ptr->state;
|
|
u32 checkpoint = l_ptr->next_in_no;
|
|
int was_active_link = tipc_link_is_active(l_ptr);
|
|
|
|
msg_set_session(l_ptr->pmsg, msg_session(l_ptr->pmsg) + 1);
|
|
|
|
/* Link is down, accept any session: */
|
|
l_ptr->peer_session = 0;
|
|
|
|
/* Prepare for max packet size negotiation */
|
|
link_init_max_pkt(l_ptr);
|
|
|
|
l_ptr->state = RESET_UNKNOWN;
|
|
dbg_link_state("Resetting Link\n");
|
|
|
|
if ((prev_state == RESET_UNKNOWN) || (prev_state == RESET_RESET))
|
|
return;
|
|
|
|
tipc_node_link_down(l_ptr->owner, l_ptr);
|
|
tipc_bearer_remove_dest(l_ptr->b_ptr, l_ptr->addr);
|
|
#if 0
|
|
tipc_printf(TIPC_CONS, "\nReset link <%s>\n", l_ptr->name);
|
|
dbg_link_dump();
|
|
#endif
|
|
if (was_active_link && tipc_node_has_active_links(l_ptr->owner) &&
|
|
l_ptr->owner->permit_changeover) {
|
|
l_ptr->reset_checkpoint = checkpoint;
|
|
l_ptr->exp_msg_count = START_CHANGEOVER;
|
|
}
|
|
|
|
/* Clean up all queues: */
|
|
|
|
link_release_outqueue(l_ptr);
|
|
buf_discard(l_ptr->proto_msg_queue);
|
|
l_ptr->proto_msg_queue = NULL;
|
|
buf = l_ptr->oldest_deferred_in;
|
|
while (buf) {
|
|
struct sk_buff *next = buf->next;
|
|
buf_discard(buf);
|
|
buf = next;
|
|
}
|
|
if (!list_empty(&l_ptr->waiting_ports))
|
|
tipc_link_wakeup_ports(l_ptr, 1);
|
|
|
|
l_ptr->retransm_queue_head = 0;
|
|
l_ptr->retransm_queue_size = 0;
|
|
l_ptr->last_out = NULL;
|
|
l_ptr->first_out = NULL;
|
|
l_ptr->next_out = NULL;
|
|
l_ptr->unacked_window = 0;
|
|
l_ptr->checkpoint = 1;
|
|
l_ptr->next_out_no = 1;
|
|
l_ptr->deferred_inqueue_sz = 0;
|
|
l_ptr->oldest_deferred_in = NULL;
|
|
l_ptr->newest_deferred_in = NULL;
|
|
l_ptr->fsm_msg_cnt = 0;
|
|
l_ptr->stale_count = 0;
|
|
link_reset_statistics(l_ptr);
|
|
|
|
link_send_event(tipc_cfg_link_event, l_ptr, 0);
|
|
if (!in_own_cluster(l_ptr->addr))
|
|
link_send_event(tipc_disc_link_event, l_ptr, 0);
|
|
}
|
|
|
|
|
|
static void link_activate(struct link *l_ptr)
|
|
{
|
|
l_ptr->next_in_no = l_ptr->stats.recv_info = 1;
|
|
tipc_node_link_up(l_ptr->owner, l_ptr);
|
|
tipc_bearer_add_dest(l_ptr->b_ptr, l_ptr->addr);
|
|
link_send_event(tipc_cfg_link_event, l_ptr, 1);
|
|
if (!in_own_cluster(l_ptr->addr))
|
|
link_send_event(tipc_disc_link_event, l_ptr, 1);
|
|
}
|
|
|
|
/**
|
|
* link_state_event - link finite state machine
|
|
* @l_ptr: pointer to link
|
|
* @event: state machine event to process
|
|
*/
|
|
|
|
static void link_state_event(struct link *l_ptr, unsigned event)
|
|
{
|
|
struct link *other;
|
|
u32 cont_intv = l_ptr->continuity_interval;
|
|
|
|
if (!l_ptr->started && (event != STARTING_EVT))
|
|
return; /* Not yet. */
|
|
|
|
if (link_blocked(l_ptr)) {
|
|
if (event == TIMEOUT_EVT) {
|
|
link_set_timer(l_ptr, cont_intv);
|
|
}
|
|
return; /* Changeover going on */
|
|
}
|
|
dbg_link("STATE_EV: <%s> ", l_ptr->name);
|
|
|
|
switch (l_ptr->state) {
|
|
case WORKING_WORKING:
|
|
dbg_link("WW/");
|
|
switch (event) {
|
|
case TRAFFIC_MSG_EVT:
|
|
dbg_link("TRF-");
|
|
/* fall through */
|
|
case ACTIVATE_MSG:
|
|
dbg_link("ACT\n");
|
|
break;
|
|
case TIMEOUT_EVT:
|
|
dbg_link("TIM ");
|
|
if (l_ptr->next_in_no != l_ptr->checkpoint) {
|
|
l_ptr->checkpoint = l_ptr->next_in_no;
|
|
if (tipc_bclink_acks_missing(l_ptr->owner)) {
|
|
tipc_link_send_proto_msg(l_ptr, STATE_MSG,
|
|
0, 0, 0, 0, 0);
|
|
l_ptr->fsm_msg_cnt++;
|
|
} else if (l_ptr->max_pkt < l_ptr->max_pkt_target) {
|
|
tipc_link_send_proto_msg(l_ptr, STATE_MSG,
|
|
1, 0, 0, 0, 0);
|
|
l_ptr->fsm_msg_cnt++;
|
|
}
|
|
link_set_timer(l_ptr, cont_intv);
|
|
break;
|
|
}
|
|
dbg_link(" -> WU\n");
|
|
l_ptr->state = WORKING_UNKNOWN;
|
|
l_ptr->fsm_msg_cnt = 0;
|
|
tipc_link_send_proto_msg(l_ptr, STATE_MSG, 1, 0, 0, 0, 0);
|
|
l_ptr->fsm_msg_cnt++;
|
|
link_set_timer(l_ptr, cont_intv / 4);
|
|
break;
|
|
case RESET_MSG:
|
|
dbg_link("RES -> RR\n");
|
|
info("Resetting link <%s>, requested by peer\n",
|
|
l_ptr->name);
|
|
tipc_link_reset(l_ptr);
|
|
l_ptr->state = RESET_RESET;
|
|
l_ptr->fsm_msg_cnt = 0;
|
|
tipc_link_send_proto_msg(l_ptr, ACTIVATE_MSG, 0, 0, 0, 0, 0);
|
|
l_ptr->fsm_msg_cnt++;
|
|
link_set_timer(l_ptr, cont_intv);
|
|
break;
|
|
default:
|
|
err("Unknown link event %u in WW state\n", event);
|
|
}
|
|
break;
|
|
case WORKING_UNKNOWN:
|
|
dbg_link("WU/");
|
|
switch (event) {
|
|
case TRAFFIC_MSG_EVT:
|
|
dbg_link("TRF-");
|
|
case ACTIVATE_MSG:
|
|
dbg_link("ACT -> WW\n");
|
|
l_ptr->state = WORKING_WORKING;
|
|
l_ptr->fsm_msg_cnt = 0;
|
|
link_set_timer(l_ptr, cont_intv);
|
|
break;
|
|
case RESET_MSG:
|
|
dbg_link("RES -> RR\n");
|
|
info("Resetting link <%s>, requested by peer "
|
|
"while probing\n", l_ptr->name);
|
|
tipc_link_reset(l_ptr);
|
|
l_ptr->state = RESET_RESET;
|
|
l_ptr->fsm_msg_cnt = 0;
|
|
tipc_link_send_proto_msg(l_ptr, ACTIVATE_MSG, 0, 0, 0, 0, 0);
|
|
l_ptr->fsm_msg_cnt++;
|
|
link_set_timer(l_ptr, cont_intv);
|
|
break;
|
|
case TIMEOUT_EVT:
|
|
dbg_link("TIM ");
|
|
if (l_ptr->next_in_no != l_ptr->checkpoint) {
|
|
dbg_link("-> WW \n");
|
|
l_ptr->state = WORKING_WORKING;
|
|
l_ptr->fsm_msg_cnt = 0;
|
|
l_ptr->checkpoint = l_ptr->next_in_no;
|
|
if (tipc_bclink_acks_missing(l_ptr->owner)) {
|
|
tipc_link_send_proto_msg(l_ptr, STATE_MSG,
|
|
0, 0, 0, 0, 0);
|
|
l_ptr->fsm_msg_cnt++;
|
|
}
|
|
link_set_timer(l_ptr, cont_intv);
|
|
} else if (l_ptr->fsm_msg_cnt < l_ptr->abort_limit) {
|
|
dbg_link("Probing %u/%u,timer = %u ms)\n",
|
|
l_ptr->fsm_msg_cnt, l_ptr->abort_limit,
|
|
cont_intv / 4);
|
|
tipc_link_send_proto_msg(l_ptr, STATE_MSG,
|
|
1, 0, 0, 0, 0);
|
|
l_ptr->fsm_msg_cnt++;
|
|
link_set_timer(l_ptr, cont_intv / 4);
|
|
} else { /* Link has failed */
|
|
dbg_link("-> RU (%u probes unanswered)\n",
|
|
l_ptr->fsm_msg_cnt);
|
|
warn("Resetting link <%s>, peer not responding\n",
|
|
l_ptr->name);
|
|
tipc_link_reset(l_ptr);
|
|
l_ptr->state = RESET_UNKNOWN;
|
|
l_ptr->fsm_msg_cnt = 0;
|
|
tipc_link_send_proto_msg(l_ptr, RESET_MSG,
|
|
0, 0, 0, 0, 0);
|
|
l_ptr->fsm_msg_cnt++;
|
|
link_set_timer(l_ptr, cont_intv);
|
|
}
|
|
break;
|
|
default:
|
|
err("Unknown link event %u in WU state\n", event);
|
|
}
|
|
break;
|
|
case RESET_UNKNOWN:
|
|
dbg_link("RU/");
|
|
switch (event) {
|
|
case TRAFFIC_MSG_EVT:
|
|
dbg_link("TRF-\n");
|
|
break;
|
|
case ACTIVATE_MSG:
|
|
other = l_ptr->owner->active_links[0];
|
|
if (other && link_working_unknown(other)) {
|
|
dbg_link("ACT\n");
|
|
break;
|
|
}
|
|
dbg_link("ACT -> WW\n");
|
|
l_ptr->state = WORKING_WORKING;
|
|
l_ptr->fsm_msg_cnt = 0;
|
|
link_activate(l_ptr);
|
|
tipc_link_send_proto_msg(l_ptr, STATE_MSG, 1, 0, 0, 0, 0);
|
|
l_ptr->fsm_msg_cnt++;
|
|
link_set_timer(l_ptr, cont_intv);
|
|
break;
|
|
case RESET_MSG:
|
|
dbg_link("RES \n");
|
|
dbg_link(" -> RR\n");
|
|
l_ptr->state = RESET_RESET;
|
|
l_ptr->fsm_msg_cnt = 0;
|
|
tipc_link_send_proto_msg(l_ptr, ACTIVATE_MSG, 1, 0, 0, 0, 0);
|
|
l_ptr->fsm_msg_cnt++;
|
|
link_set_timer(l_ptr, cont_intv);
|
|
break;
|
|
case STARTING_EVT:
|
|
dbg_link("START-");
|
|
l_ptr->started = 1;
|
|
/* fall through */
|
|
case TIMEOUT_EVT:
|
|
dbg_link("TIM \n");
|
|
tipc_link_send_proto_msg(l_ptr, RESET_MSG, 0, 0, 0, 0, 0);
|
|
l_ptr->fsm_msg_cnt++;
|
|
link_set_timer(l_ptr, cont_intv);
|
|
break;
|
|
default:
|
|
err("Unknown link event %u in RU state\n", event);
|
|
}
|
|
break;
|
|
case RESET_RESET:
|
|
dbg_link("RR/ ");
|
|
switch (event) {
|
|
case TRAFFIC_MSG_EVT:
|
|
dbg_link("TRF-");
|
|
/* fall through */
|
|
case ACTIVATE_MSG:
|
|
other = l_ptr->owner->active_links[0];
|
|
if (other && link_working_unknown(other)) {
|
|
dbg_link("ACT\n");
|
|
break;
|
|
}
|
|
dbg_link("ACT -> WW\n");
|
|
l_ptr->state = WORKING_WORKING;
|
|
l_ptr->fsm_msg_cnt = 0;
|
|
link_activate(l_ptr);
|
|
tipc_link_send_proto_msg(l_ptr, STATE_MSG, 1, 0, 0, 0, 0);
|
|
l_ptr->fsm_msg_cnt++;
|
|
link_set_timer(l_ptr, cont_intv);
|
|
break;
|
|
case RESET_MSG:
|
|
dbg_link("RES\n");
|
|
break;
|
|
case TIMEOUT_EVT:
|
|
dbg_link("TIM\n");
|
|
tipc_link_send_proto_msg(l_ptr, ACTIVATE_MSG, 0, 0, 0, 0, 0);
|
|
l_ptr->fsm_msg_cnt++;
|
|
link_set_timer(l_ptr, cont_intv);
|
|
dbg_link("fsm_msg_cnt %u\n", l_ptr->fsm_msg_cnt);
|
|
break;
|
|
default:
|
|
err("Unknown link event %u in RR state\n", event);
|
|
}
|
|
break;
|
|
default:
|
|
err("Unknown link state %u/%u\n", l_ptr->state, event);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* link_bundle_buf(): Append contents of a buffer to
|
|
* the tail of an existing one.
|
|
*/
|
|
|
|
static int link_bundle_buf(struct link *l_ptr,
|
|
struct sk_buff *bundler,
|
|
struct sk_buff *buf)
|
|
{
|
|
struct tipc_msg *bundler_msg = buf_msg(bundler);
|
|
struct tipc_msg *msg = buf_msg(buf);
|
|
u32 size = msg_size(msg);
|
|
u32 bundle_size = msg_size(bundler_msg);
|
|
u32 to_pos = align(bundle_size);
|
|
u32 pad = to_pos - bundle_size;
|
|
|
|
if (msg_user(bundler_msg) != MSG_BUNDLER)
|
|
return 0;
|
|
if (msg_type(bundler_msg) != OPEN_MSG)
|
|
return 0;
|
|
if (skb_tailroom(bundler) < (pad + size))
|
|
return 0;
|
|
if (link_max_pkt(l_ptr) < (to_pos + size))
|
|
return 0;
|
|
|
|
skb_put(bundler, pad + size);
|
|
memcpy(bundler->data + to_pos, buf->data, size);
|
|
msg_set_size(bundler_msg, to_pos + size);
|
|
msg_set_msgcnt(bundler_msg, msg_msgcnt(bundler_msg) + 1);
|
|
dbg("Packed msg # %u(%u octets) into pos %u in buf(#%u)\n",
|
|
msg_msgcnt(bundler_msg), size, to_pos, msg_seqno(bundler_msg));
|
|
msg_dbg(msg, "PACKD:");
|
|
buf_discard(buf);
|
|
l_ptr->stats.sent_bundled++;
|
|
return 1;
|
|
}
|
|
|
|
static void link_add_to_outqueue(struct link *l_ptr,
|
|
struct sk_buff *buf,
|
|
struct tipc_msg *msg)
|
|
{
|
|
u32 ack = mod(l_ptr->next_in_no - 1);
|
|
u32 seqno = mod(l_ptr->next_out_no++);
|
|
|
|
msg_set_word(msg, 2, ((ack << 16) | seqno));
|
|
msg_set_bcast_ack(msg, l_ptr->owner->bclink.last_in);
|
|
buf->next = NULL;
|
|
if (l_ptr->first_out) {
|
|
l_ptr->last_out->next = buf;
|
|
l_ptr->last_out = buf;
|
|
} else
|
|
l_ptr->first_out = l_ptr->last_out = buf;
|
|
l_ptr->out_queue_size++;
|
|
}
|
|
|
|
/*
|
|
* tipc_link_send_buf() is the 'full path' for messages, called from
|
|
* inside TIPC when the 'fast path' in tipc_send_buf
|
|
* has failed, and from link_send()
|
|
*/
|
|
|
|
int tipc_link_send_buf(struct link *l_ptr, struct sk_buff *buf)
|
|
{
|
|
struct tipc_msg *msg = buf_msg(buf);
|
|
u32 size = msg_size(msg);
|
|
u32 dsz = msg_data_sz(msg);
|
|
u32 queue_size = l_ptr->out_queue_size;
|
|
u32 imp = msg_tot_importance(msg);
|
|
u32 queue_limit = l_ptr->queue_limit[imp];
|
|
u32 max_packet = link_max_pkt(l_ptr);
|
|
|
|
msg_set_prevnode(msg, tipc_own_addr); /* If routed message */
|
|
|
|
/* Match msg importance against queue limits: */
|
|
|
|
if (unlikely(queue_size >= queue_limit)) {
|
|
if (imp <= TIPC_CRITICAL_IMPORTANCE) {
|
|
return link_schedule_port(l_ptr, msg_origport(msg),
|
|
size);
|
|
}
|
|
msg_dbg(msg, "TIPC: Congestion, throwing away\n");
|
|
buf_discard(buf);
|
|
if (imp > CONN_MANAGER) {
|
|
warn("Resetting link <%s>, send queue full", l_ptr->name);
|
|
tipc_link_reset(l_ptr);
|
|
}
|
|
return dsz;
|
|
}
|
|
|
|
/* Fragmentation needed ? */
|
|
|
|
if (size > max_packet)
|
|
return tipc_link_send_long_buf(l_ptr, buf);
|
|
|
|
/* Packet can be queued or sent: */
|
|
|
|
if (queue_size > l_ptr->stats.max_queue_sz)
|
|
l_ptr->stats.max_queue_sz = queue_size;
|
|
|
|
if (likely(!tipc_bearer_congested(l_ptr->b_ptr, l_ptr) &&
|
|
!link_congested(l_ptr))) {
|
|
link_add_to_outqueue(l_ptr, buf, msg);
|
|
|
|
if (likely(tipc_bearer_send(l_ptr->b_ptr, buf, &l_ptr->media_addr))) {
|
|
l_ptr->unacked_window = 0;
|
|
} else {
|
|
tipc_bearer_schedule(l_ptr->b_ptr, l_ptr);
|
|
l_ptr->stats.bearer_congs++;
|
|
l_ptr->next_out = buf;
|
|
}
|
|
return dsz;
|
|
}
|
|
/* Congestion: can message be bundled ?: */
|
|
|
|
if ((msg_user(msg) != CHANGEOVER_PROTOCOL) &&
|
|
(msg_user(msg) != MSG_FRAGMENTER)) {
|
|
|
|
/* Try adding message to an existing bundle */
|
|
|
|
if (l_ptr->next_out &&
|
|
link_bundle_buf(l_ptr, l_ptr->last_out, buf)) {
|
|
tipc_bearer_resolve_congestion(l_ptr->b_ptr, l_ptr);
|
|
return dsz;
|
|
}
|
|
|
|
/* Try creating a new bundle */
|
|
|
|
if (size <= max_packet * 2 / 3) {
|
|
struct sk_buff *bundler = buf_acquire(max_packet);
|
|
struct tipc_msg bundler_hdr;
|
|
|
|
if (bundler) {
|
|
msg_init(&bundler_hdr, MSG_BUNDLER, OPEN_MSG,
|
|
TIPC_OK, INT_H_SIZE, l_ptr->addr);
|
|
memcpy(bundler->data, (unchar *)&bundler_hdr,
|
|
INT_H_SIZE);
|
|
skb_trim(bundler, INT_H_SIZE);
|
|
link_bundle_buf(l_ptr, bundler, buf);
|
|
buf = bundler;
|
|
msg = buf_msg(buf);
|
|
l_ptr->stats.sent_bundles++;
|
|
}
|
|
}
|
|
}
|
|
if (!l_ptr->next_out)
|
|
l_ptr->next_out = buf;
|
|
link_add_to_outqueue(l_ptr, buf, msg);
|
|
tipc_bearer_resolve_congestion(l_ptr->b_ptr, l_ptr);
|
|
return dsz;
|
|
}
|
|
|
|
/*
|
|
* tipc_link_send(): same as tipc_link_send_buf(), but the link to use has
|
|
* not been selected yet, and the the owner node is not locked
|
|
* Called by TIPC internal users, e.g. the name distributor
|
|
*/
|
|
|
|
int tipc_link_send(struct sk_buff *buf, u32 dest, u32 selector)
|
|
{
|
|
struct link *l_ptr;
|
|
struct node *n_ptr;
|
|
int res = -ELINKCONG;
|
|
|
|
read_lock_bh(&tipc_net_lock);
|
|
n_ptr = tipc_node_select(dest, selector);
|
|
if (n_ptr) {
|
|
tipc_node_lock(n_ptr);
|
|
l_ptr = n_ptr->active_links[selector & 1];
|
|
if (l_ptr) {
|
|
dbg("tipc_link_send: found link %x for dest %x\n", l_ptr, dest);
|
|
res = tipc_link_send_buf(l_ptr, buf);
|
|
} else {
|
|
dbg("Attempt to send msg to unreachable node:\n");
|
|
msg_dbg(buf_msg(buf),">>>");
|
|
buf_discard(buf);
|
|
}
|
|
tipc_node_unlock(n_ptr);
|
|
} else {
|
|
dbg("Attempt to send msg to unknown node:\n");
|
|
msg_dbg(buf_msg(buf),">>>");
|
|
buf_discard(buf);
|
|
}
|
|
read_unlock_bh(&tipc_net_lock);
|
|
return res;
|
|
}
|
|
|
|
/*
|
|
* link_send_buf_fast: Entry for data messages where the
|
|
* destination link is known and the header is complete,
|
|
* inclusive total message length. Very time critical.
|
|
* Link is locked. Returns user data length.
|
|
*/
|
|
|
|
static int link_send_buf_fast(struct link *l_ptr, struct sk_buff *buf,
|
|
u32 *used_max_pkt)
|
|
{
|
|
struct tipc_msg *msg = buf_msg(buf);
|
|
int res = msg_data_sz(msg);
|
|
|
|
if (likely(!link_congested(l_ptr))) {
|
|
if (likely(msg_size(msg) <= link_max_pkt(l_ptr))) {
|
|
if (likely(list_empty(&l_ptr->b_ptr->cong_links))) {
|
|
link_add_to_outqueue(l_ptr, buf, msg);
|
|
if (likely(tipc_bearer_send(l_ptr->b_ptr, buf,
|
|
&l_ptr->media_addr))) {
|
|
l_ptr->unacked_window = 0;
|
|
msg_dbg(msg,"SENT_FAST:");
|
|
return res;
|
|
}
|
|
dbg("failed sent fast...\n");
|
|
tipc_bearer_schedule(l_ptr->b_ptr, l_ptr);
|
|
l_ptr->stats.bearer_congs++;
|
|
l_ptr->next_out = buf;
|
|
return res;
|
|
}
|
|
}
|
|
else
|
|
*used_max_pkt = link_max_pkt(l_ptr);
|
|
}
|
|
return tipc_link_send_buf(l_ptr, buf); /* All other cases */
|
|
}
|
|
|
|
/*
|
|
* tipc_send_buf_fast: Entry for data messages where the
|
|
* destination node is known and the header is complete,
|
|
* inclusive total message length.
|
|
* Returns user data length.
|
|
*/
|
|
int tipc_send_buf_fast(struct sk_buff *buf, u32 destnode)
|
|
{
|
|
struct link *l_ptr;
|
|
struct node *n_ptr;
|
|
int res;
|
|
u32 selector = msg_origport(buf_msg(buf)) & 1;
|
|
u32 dummy;
|
|
|
|
if (destnode == tipc_own_addr)
|
|
return tipc_port_recv_msg(buf);
|
|
|
|
read_lock_bh(&tipc_net_lock);
|
|
n_ptr = tipc_node_select(destnode, selector);
|
|
if (likely(n_ptr)) {
|
|
tipc_node_lock(n_ptr);
|
|
l_ptr = n_ptr->active_links[selector];
|
|
dbg("send_fast: buf %x selected %x, destnode = %x\n",
|
|
buf, l_ptr, destnode);
|
|
if (likely(l_ptr)) {
|
|
res = link_send_buf_fast(l_ptr, buf, &dummy);
|
|
tipc_node_unlock(n_ptr);
|
|
read_unlock_bh(&tipc_net_lock);
|
|
return res;
|
|
}
|
|
tipc_node_unlock(n_ptr);
|
|
}
|
|
read_unlock_bh(&tipc_net_lock);
|
|
res = msg_data_sz(buf_msg(buf));
|
|
tipc_reject_msg(buf, TIPC_ERR_NO_NODE);
|
|
return res;
|
|
}
|
|
|
|
|
|
/*
|
|
* tipc_link_send_sections_fast: Entry for messages where the
|
|
* destination processor is known and the header is complete,
|
|
* except for total message length.
|
|
* Returns user data length or errno.
|
|
*/
|
|
int tipc_link_send_sections_fast(struct port *sender,
|
|
struct iovec const *msg_sect,
|
|
const u32 num_sect,
|
|
u32 destaddr)
|
|
{
|
|
struct tipc_msg *hdr = &sender->publ.phdr;
|
|
struct link *l_ptr;
|
|
struct sk_buff *buf;
|
|
struct node *node;
|
|
int res;
|
|
u32 selector = msg_origport(hdr) & 1;
|
|
|
|
again:
|
|
/*
|
|
* Try building message using port's max_pkt hint.
|
|
* (Must not hold any locks while building message.)
|
|
*/
|
|
|
|
res = msg_build(hdr, msg_sect, num_sect, sender->max_pkt,
|
|
!sender->user_port, &buf);
|
|
|
|
read_lock_bh(&tipc_net_lock);
|
|
node = tipc_node_select(destaddr, selector);
|
|
if (likely(node)) {
|
|
tipc_node_lock(node);
|
|
l_ptr = node->active_links[selector];
|
|
if (likely(l_ptr)) {
|
|
if (likely(buf)) {
|
|
res = link_send_buf_fast(l_ptr, buf,
|
|
&sender->max_pkt);
|
|
if (unlikely(res < 0))
|
|
buf_discard(buf);
|
|
exit:
|
|
tipc_node_unlock(node);
|
|
read_unlock_bh(&tipc_net_lock);
|
|
return res;
|
|
}
|
|
|
|
/* Exit if build request was invalid */
|
|
|
|
if (unlikely(res < 0))
|
|
goto exit;
|
|
|
|
/* Exit if link (or bearer) is congested */
|
|
|
|
if (link_congested(l_ptr) ||
|
|
!list_empty(&l_ptr->b_ptr->cong_links)) {
|
|
res = link_schedule_port(l_ptr,
|
|
sender->publ.ref, res);
|
|
goto exit;
|
|
}
|
|
|
|
/*
|
|
* Message size exceeds max_pkt hint; update hint,
|
|
* then re-try fast path or fragment the message
|
|
*/
|
|
|
|
sender->max_pkt = link_max_pkt(l_ptr);
|
|
tipc_node_unlock(node);
|
|
read_unlock_bh(&tipc_net_lock);
|
|
|
|
|
|
if ((msg_hdr_sz(hdr) + res) <= sender->max_pkt)
|
|
goto again;
|
|
|
|
return link_send_sections_long(sender, msg_sect,
|
|
num_sect, destaddr);
|
|
}
|
|
tipc_node_unlock(node);
|
|
}
|
|
read_unlock_bh(&tipc_net_lock);
|
|
|
|
/* Couldn't find a link to the destination node */
|
|
|
|
if (buf)
|
|
return tipc_reject_msg(buf, TIPC_ERR_NO_NODE);
|
|
if (res >= 0)
|
|
return tipc_port_reject_sections(sender, hdr, msg_sect, num_sect,
|
|
TIPC_ERR_NO_NODE);
|
|
return res;
|
|
}
|
|
|
|
/*
|
|
* link_send_sections_long(): Entry for long messages where the
|
|
* destination node is known and the header is complete,
|
|
* inclusive total message length.
|
|
* Link and bearer congestion status have been checked to be ok,
|
|
* and are ignored if they change.
|
|
*
|
|
* Note that fragments do not use the full link MTU so that they won't have
|
|
* to undergo refragmentation if link changeover causes them to be sent
|
|
* over another link with an additional tunnel header added as prefix.
|
|
* (Refragmentation will still occur if the other link has a smaller MTU.)
|
|
*
|
|
* Returns user data length or errno.
|
|
*/
|
|
static int link_send_sections_long(struct port *sender,
|
|
struct iovec const *msg_sect,
|
|
u32 num_sect,
|
|
u32 destaddr)
|
|
{
|
|
struct link *l_ptr;
|
|
struct node *node;
|
|
struct tipc_msg *hdr = &sender->publ.phdr;
|
|
u32 dsz = msg_data_sz(hdr);
|
|
u32 max_pkt,fragm_sz,rest;
|
|
struct tipc_msg fragm_hdr;
|
|
struct sk_buff *buf,*buf_chain,*prev;
|
|
u32 fragm_crs,fragm_rest,hsz,sect_rest;
|
|
const unchar *sect_crs;
|
|
int curr_sect;
|
|
u32 fragm_no;
|
|
|
|
again:
|
|
fragm_no = 1;
|
|
max_pkt = sender->max_pkt - INT_H_SIZE;
|
|
/* leave room for tunnel header in case of link changeover */
|
|
fragm_sz = max_pkt - INT_H_SIZE;
|
|
/* leave room for fragmentation header in each fragment */
|
|
rest = dsz;
|
|
fragm_crs = 0;
|
|
fragm_rest = 0;
|
|
sect_rest = 0;
|
|
sect_crs = NULL;
|
|
curr_sect = -1;
|
|
|
|
/* Prepare reusable fragment header: */
|
|
|
|
msg_dbg(hdr, ">FRAGMENTING>");
|
|
msg_init(&fragm_hdr, MSG_FRAGMENTER, FIRST_FRAGMENT,
|
|
TIPC_OK, INT_H_SIZE, msg_destnode(hdr));
|
|
msg_set_link_selector(&fragm_hdr, sender->publ.ref);
|
|
msg_set_size(&fragm_hdr, max_pkt);
|
|
msg_set_fragm_no(&fragm_hdr, 1);
|
|
|
|
/* Prepare header of first fragment: */
|
|
|
|
buf_chain = buf = buf_acquire(max_pkt);
|
|
if (!buf)
|
|
return -ENOMEM;
|
|
buf->next = NULL;
|
|
memcpy(buf->data, (unchar *)&fragm_hdr, INT_H_SIZE);
|
|
hsz = msg_hdr_sz(hdr);
|
|
memcpy(buf->data + INT_H_SIZE, (unchar *)hdr, hsz);
|
|
msg_dbg(buf_msg(buf), ">BUILD>");
|
|
|
|
/* Chop up message: */
|
|
|
|
fragm_crs = INT_H_SIZE + hsz;
|
|
fragm_rest = fragm_sz - hsz;
|
|
|
|
do { /* For all sections */
|
|
u32 sz;
|
|
|
|
if (!sect_rest) {
|
|
sect_rest = msg_sect[++curr_sect].iov_len;
|
|
sect_crs = (const unchar *)msg_sect[curr_sect].iov_base;
|
|
}
|
|
|
|
if (sect_rest < fragm_rest)
|
|
sz = sect_rest;
|
|
else
|
|
sz = fragm_rest;
|
|
|
|
if (likely(!sender->user_port)) {
|
|
if (copy_from_user(buf->data + fragm_crs, sect_crs, sz)) {
|
|
error:
|
|
for (; buf_chain; buf_chain = buf) {
|
|
buf = buf_chain->next;
|
|
buf_discard(buf_chain);
|
|
}
|
|
return -EFAULT;
|
|
}
|
|
} else
|
|
memcpy(buf->data + fragm_crs, sect_crs, sz);
|
|
|
|
sect_crs += sz;
|
|
sect_rest -= sz;
|
|
fragm_crs += sz;
|
|
fragm_rest -= sz;
|
|
rest -= sz;
|
|
|
|
if (!fragm_rest && rest) {
|
|
|
|
/* Initiate new fragment: */
|
|
if (rest <= fragm_sz) {
|
|
fragm_sz = rest;
|
|
msg_set_type(&fragm_hdr,LAST_FRAGMENT);
|
|
} else {
|
|
msg_set_type(&fragm_hdr, FRAGMENT);
|
|
}
|
|
msg_set_size(&fragm_hdr, fragm_sz + INT_H_SIZE);
|
|
msg_set_fragm_no(&fragm_hdr, ++fragm_no);
|
|
prev = buf;
|
|
buf = buf_acquire(fragm_sz + INT_H_SIZE);
|
|
if (!buf)
|
|
goto error;
|
|
|
|
buf->next = NULL;
|
|
prev->next = buf;
|
|
memcpy(buf->data, (unchar *)&fragm_hdr, INT_H_SIZE);
|
|
fragm_crs = INT_H_SIZE;
|
|
fragm_rest = fragm_sz;
|
|
msg_dbg(buf_msg(buf)," >BUILD>");
|
|
}
|
|
}
|
|
while (rest > 0);
|
|
|
|
/*
|
|
* Now we have a buffer chain. Select a link and check
|
|
* that packet size is still OK
|
|
*/
|
|
node = tipc_node_select(destaddr, sender->publ.ref & 1);
|
|
if (likely(node)) {
|
|
tipc_node_lock(node);
|
|
l_ptr = node->active_links[sender->publ.ref & 1];
|
|
if (!l_ptr) {
|
|
tipc_node_unlock(node);
|
|
goto reject;
|
|
}
|
|
if (link_max_pkt(l_ptr) < max_pkt) {
|
|
sender->max_pkt = link_max_pkt(l_ptr);
|
|
tipc_node_unlock(node);
|
|
for (; buf_chain; buf_chain = buf) {
|
|
buf = buf_chain->next;
|
|
buf_discard(buf_chain);
|
|
}
|
|
goto again;
|
|
}
|
|
} else {
|
|
reject:
|
|
for (; buf_chain; buf_chain = buf) {
|
|
buf = buf_chain->next;
|
|
buf_discard(buf_chain);
|
|
}
|
|
return tipc_port_reject_sections(sender, hdr, msg_sect, num_sect,
|
|
TIPC_ERR_NO_NODE);
|
|
}
|
|
|
|
/* Append whole chain to send queue: */
|
|
|
|
buf = buf_chain;
|
|
l_ptr->long_msg_seq_no = mod(l_ptr->long_msg_seq_no + 1);
|
|
if (!l_ptr->next_out)
|
|
l_ptr->next_out = buf_chain;
|
|
l_ptr->stats.sent_fragmented++;
|
|
while (buf) {
|
|
struct sk_buff *next = buf->next;
|
|
struct tipc_msg *msg = buf_msg(buf);
|
|
|
|
l_ptr->stats.sent_fragments++;
|
|
msg_set_long_msgno(msg, l_ptr->long_msg_seq_no);
|
|
link_add_to_outqueue(l_ptr, buf, msg);
|
|
msg_dbg(msg, ">ADD>");
|
|
buf = next;
|
|
}
|
|
|
|
/* Send it, if possible: */
|
|
|
|
tipc_link_push_queue(l_ptr);
|
|
tipc_node_unlock(node);
|
|
return dsz;
|
|
}
|
|
|
|
/*
|
|
* tipc_link_push_packet: Push one unsent packet to the media
|
|
*/
|
|
u32 tipc_link_push_packet(struct link *l_ptr)
|
|
{
|
|
struct sk_buff *buf = l_ptr->first_out;
|
|
u32 r_q_size = l_ptr->retransm_queue_size;
|
|
u32 r_q_head = l_ptr->retransm_queue_head;
|
|
|
|
/* Step to position where retransmission failed, if any, */
|
|
/* consider that buffers may have been released in meantime */
|
|
|
|
if (r_q_size && buf) {
|
|
u32 last = lesser(mod(r_q_head + r_q_size),
|
|
link_last_sent(l_ptr));
|
|
u32 first = msg_seqno(buf_msg(buf));
|
|
|
|
while (buf && less(first, r_q_head)) {
|
|
first = mod(first + 1);
|
|
buf = buf->next;
|
|
}
|
|
l_ptr->retransm_queue_head = r_q_head = first;
|
|
l_ptr->retransm_queue_size = r_q_size = mod(last - first);
|
|
}
|
|
|
|
/* Continue retransmission now, if there is anything: */
|
|
|
|
if (r_q_size && buf && !skb_cloned(buf)) {
|
|
msg_set_ack(buf_msg(buf), mod(l_ptr->next_in_no - 1));
|
|
msg_set_bcast_ack(buf_msg(buf), l_ptr->owner->bclink.last_in);
|
|
if (tipc_bearer_send(l_ptr->b_ptr, buf, &l_ptr->media_addr)) {
|
|
msg_dbg(buf_msg(buf), ">DEF-RETR>");
|
|
l_ptr->retransm_queue_head = mod(++r_q_head);
|
|
l_ptr->retransm_queue_size = --r_q_size;
|
|
l_ptr->stats.retransmitted++;
|
|
return TIPC_OK;
|
|
} else {
|
|
l_ptr->stats.bearer_congs++;
|
|
msg_dbg(buf_msg(buf), "|>DEF-RETR>");
|
|
return PUSH_FAILED;
|
|
}
|
|
}
|
|
|
|
/* Send deferred protocol message, if any: */
|
|
|
|
buf = l_ptr->proto_msg_queue;
|
|
if (buf) {
|
|
msg_set_ack(buf_msg(buf), mod(l_ptr->next_in_no - 1));
|
|
msg_set_bcast_ack(buf_msg(buf),l_ptr->owner->bclink.last_in);
|
|
if (tipc_bearer_send(l_ptr->b_ptr, buf, &l_ptr->media_addr)) {
|
|
msg_dbg(buf_msg(buf), ">DEF-PROT>");
|
|
l_ptr->unacked_window = 0;
|
|
buf_discard(buf);
|
|
l_ptr->proto_msg_queue = NULL;
|
|
return TIPC_OK;
|
|
} else {
|
|
msg_dbg(buf_msg(buf), "|>DEF-PROT>");
|
|
l_ptr->stats.bearer_congs++;
|
|
return PUSH_FAILED;
|
|
}
|
|
}
|
|
|
|
/* Send one deferred data message, if send window not full: */
|
|
|
|
buf = l_ptr->next_out;
|
|
if (buf) {
|
|
struct tipc_msg *msg = buf_msg(buf);
|
|
u32 next = msg_seqno(msg);
|
|
u32 first = msg_seqno(buf_msg(l_ptr->first_out));
|
|
|
|
if (mod(next - first) < l_ptr->queue_limit[0]) {
|
|
msg_set_ack(msg, mod(l_ptr->next_in_no - 1));
|
|
msg_set_bcast_ack(msg, l_ptr->owner->bclink.last_in);
|
|
if (tipc_bearer_send(l_ptr->b_ptr, buf, &l_ptr->media_addr)) {
|
|
if (msg_user(msg) == MSG_BUNDLER)
|
|
msg_set_type(msg, CLOSED_MSG);
|
|
msg_dbg(msg, ">PUSH-DATA>");
|
|
l_ptr->next_out = buf->next;
|
|
return TIPC_OK;
|
|
} else {
|
|
msg_dbg(msg, "|PUSH-DATA|");
|
|
l_ptr->stats.bearer_congs++;
|
|
return PUSH_FAILED;
|
|
}
|
|
}
|
|
}
|
|
return PUSH_FINISHED;
|
|
}
|
|
|
|
/*
|
|
* push_queue(): push out the unsent messages of a link where
|
|
* congestion has abated. Node is locked
|
|
*/
|
|
void tipc_link_push_queue(struct link *l_ptr)
|
|
{
|
|
u32 res;
|
|
|
|
if (tipc_bearer_congested(l_ptr->b_ptr, l_ptr))
|
|
return;
|
|
|
|
do {
|
|
res = tipc_link_push_packet(l_ptr);
|
|
}
|
|
while (res == TIPC_OK);
|
|
if (res == PUSH_FAILED)
|
|
tipc_bearer_schedule(l_ptr->b_ptr, l_ptr);
|
|
}
|
|
|
|
static void link_reset_all(unsigned long addr)
|
|
{
|
|
struct node *n_ptr;
|
|
char addr_string[16];
|
|
u32 i;
|
|
|
|
read_lock_bh(&tipc_net_lock);
|
|
n_ptr = tipc_node_find((u32)addr);
|
|
if (!n_ptr) {
|
|
read_unlock_bh(&tipc_net_lock);
|
|
return; /* node no longer exists */
|
|
}
|
|
|
|
tipc_node_lock(n_ptr);
|
|
|
|
warn("Resetting all links to %s\n",
|
|
addr_string_fill(addr_string, n_ptr->addr));
|
|
|
|
for (i = 0; i < MAX_BEARERS; i++) {
|
|
if (n_ptr->links[i]) {
|
|
link_print(n_ptr->links[i], TIPC_OUTPUT,
|
|
"Resetting link\n");
|
|
tipc_link_reset(n_ptr->links[i]);
|
|
}
|
|
}
|
|
|
|
tipc_node_unlock(n_ptr);
|
|
read_unlock_bh(&tipc_net_lock);
|
|
}
|
|
|
|
static void link_retransmit_failure(struct link *l_ptr, struct sk_buff *buf)
|
|
{
|
|
struct tipc_msg *msg = buf_msg(buf);
|
|
|
|
warn("Retransmission failure on link <%s>\n", l_ptr->name);
|
|
tipc_msg_print(TIPC_OUTPUT, msg, ">RETR-FAIL>");
|
|
|
|
if (l_ptr->addr) {
|
|
|
|
/* Handle failure on standard link */
|
|
|
|
link_print(l_ptr, TIPC_OUTPUT, "Resetting link\n");
|
|
tipc_link_reset(l_ptr);
|
|
|
|
} else {
|
|
|
|
/* Handle failure on broadcast link */
|
|
|
|
struct node *n_ptr;
|
|
char addr_string[16];
|
|
|
|
tipc_printf(TIPC_OUTPUT, "Msg seq number: %u, ", msg_seqno(msg));
|
|
tipc_printf(TIPC_OUTPUT, "Outstanding acks: %lu\n",
|
|
(unsigned long) TIPC_SKB_CB(buf)->handle);
|
|
|
|
n_ptr = l_ptr->owner->next;
|
|
tipc_node_lock(n_ptr);
|
|
|
|
addr_string_fill(addr_string, n_ptr->addr);
|
|
tipc_printf(TIPC_OUTPUT, "Multicast link info for %s\n", addr_string);
|
|
tipc_printf(TIPC_OUTPUT, "Supported: %d, ", n_ptr->bclink.supported);
|
|
tipc_printf(TIPC_OUTPUT, "Acked: %u\n", n_ptr->bclink.acked);
|
|
tipc_printf(TIPC_OUTPUT, "Last in: %u, ", n_ptr->bclink.last_in);
|
|
tipc_printf(TIPC_OUTPUT, "Gap after: %u, ", n_ptr->bclink.gap_after);
|
|
tipc_printf(TIPC_OUTPUT, "Gap to: %u\n", n_ptr->bclink.gap_to);
|
|
tipc_printf(TIPC_OUTPUT, "Nack sync: %u\n\n", n_ptr->bclink.nack_sync);
|
|
|
|
tipc_k_signal((Handler)link_reset_all, (unsigned long)n_ptr->addr);
|
|
|
|
tipc_node_unlock(n_ptr);
|
|
|
|
l_ptr->stale_count = 0;
|
|
}
|
|
}
|
|
|
|
void tipc_link_retransmit(struct link *l_ptr, struct sk_buff *buf,
|
|
u32 retransmits)
|
|
{
|
|
struct tipc_msg *msg;
|
|
|
|
if (!buf)
|
|
return;
|
|
|
|
msg = buf_msg(buf);
|
|
|
|
dbg("Retransmitting %u in link %x\n", retransmits, l_ptr);
|
|
|
|
if (tipc_bearer_congested(l_ptr->b_ptr, l_ptr)) {
|
|
if (!skb_cloned(buf)) {
|
|
msg_dbg(msg, ">NO_RETR->BCONG>");
|
|
dbg_print_link(l_ptr, " ");
|
|
l_ptr->retransm_queue_head = msg_seqno(msg);
|
|
l_ptr->retransm_queue_size = retransmits;
|
|
return;
|
|
} else {
|
|
/* Don't retransmit if driver already has the buffer */
|
|
}
|
|
} else {
|
|
/* Detect repeated retransmit failures on uncongested bearer */
|
|
|
|
if (l_ptr->last_retransmitted == msg_seqno(msg)) {
|
|
if (++l_ptr->stale_count > 100) {
|
|
link_retransmit_failure(l_ptr, buf);
|
|
return;
|
|
}
|
|
} else {
|
|
l_ptr->last_retransmitted = msg_seqno(msg);
|
|
l_ptr->stale_count = 1;
|
|
}
|
|
}
|
|
|
|
while (retransmits && (buf != l_ptr->next_out) && buf && !skb_cloned(buf)) {
|
|
msg = buf_msg(buf);
|
|
msg_set_ack(msg, mod(l_ptr->next_in_no - 1));
|
|
msg_set_bcast_ack(msg, l_ptr->owner->bclink.last_in);
|
|
if (tipc_bearer_send(l_ptr->b_ptr, buf, &l_ptr->media_addr)) {
|
|
msg_dbg(buf_msg(buf), ">RETR>");
|
|
buf = buf->next;
|
|
retransmits--;
|
|
l_ptr->stats.retransmitted++;
|
|
} else {
|
|
tipc_bearer_schedule(l_ptr->b_ptr, l_ptr);
|
|
l_ptr->stats.bearer_congs++;
|
|
l_ptr->retransm_queue_head = msg_seqno(buf_msg(buf));
|
|
l_ptr->retransm_queue_size = retransmits;
|
|
return;
|
|
}
|
|
}
|
|
|
|
l_ptr->retransm_queue_head = l_ptr->retransm_queue_size = 0;
|
|
}
|
|
|
|
/*
|
|
* link_recv_non_seq: Receive packets which are outside
|
|
* the link sequence flow
|
|
*/
|
|
|
|
static void link_recv_non_seq(struct sk_buff *buf)
|
|
{
|
|
struct tipc_msg *msg = buf_msg(buf);
|
|
|
|
if (msg_user(msg) == LINK_CONFIG)
|
|
tipc_disc_recv_msg(buf);
|
|
else
|
|
tipc_bclink_recv_pkt(buf);
|
|
}
|
|
|
|
/**
|
|
* link_insert_deferred_queue - insert deferred messages back into receive chain
|
|
*/
|
|
|
|
static struct sk_buff *link_insert_deferred_queue(struct link *l_ptr,
|
|
struct sk_buff *buf)
|
|
{
|
|
u32 seq_no;
|
|
|
|
if (l_ptr->oldest_deferred_in == NULL)
|
|
return buf;
|
|
|
|
seq_no = msg_seqno(buf_msg(l_ptr->oldest_deferred_in));
|
|
if (seq_no == mod(l_ptr->next_in_no)) {
|
|
l_ptr->newest_deferred_in->next = buf;
|
|
buf = l_ptr->oldest_deferred_in;
|
|
l_ptr->oldest_deferred_in = NULL;
|
|
l_ptr->deferred_inqueue_sz = 0;
|
|
}
|
|
return buf;
|
|
}
|
|
|
|
void tipc_recv_msg(struct sk_buff *head, struct tipc_bearer *tb_ptr)
|
|
{
|
|
read_lock_bh(&tipc_net_lock);
|
|
while (head) {
|
|
struct bearer *b_ptr;
|
|
struct node *n_ptr;
|
|
struct link *l_ptr;
|
|
struct sk_buff *crs;
|
|
struct sk_buff *buf = head;
|
|
struct tipc_msg *msg = buf_msg(buf);
|
|
u32 seq_no = msg_seqno(msg);
|
|
u32 ackd = msg_ack(msg);
|
|
u32 released = 0;
|
|
int type;
|
|
|
|
b_ptr = (struct bearer *)tb_ptr;
|
|
TIPC_SKB_CB(buf)->handle = b_ptr;
|
|
|
|
head = head->next;
|
|
if (unlikely(msg_version(msg) != TIPC_VERSION))
|
|
goto cont;
|
|
#if 0
|
|
if (msg_user(msg) != LINK_PROTOCOL)
|
|
#endif
|
|
msg_dbg(msg,"<REC<");
|
|
|
|
if (unlikely(msg_non_seq(msg))) {
|
|
link_recv_non_seq(buf);
|
|
continue;
|
|
}
|
|
|
|
if (unlikely(!msg_short(msg) &&
|
|
(msg_destnode(msg) != tipc_own_addr)))
|
|
goto cont;
|
|
|
|
n_ptr = tipc_node_find(msg_prevnode(msg));
|
|
if (unlikely(!n_ptr))
|
|
goto cont;
|
|
|
|
tipc_node_lock(n_ptr);
|
|
l_ptr = n_ptr->links[b_ptr->identity];
|
|
if (unlikely(!l_ptr)) {
|
|
tipc_node_unlock(n_ptr);
|
|
goto cont;
|
|
}
|
|
/*
|
|
* Release acked messages
|
|
*/
|
|
if (less(n_ptr->bclink.acked, msg_bcast_ack(msg))) {
|
|
if (tipc_node_is_up(n_ptr) && n_ptr->bclink.supported)
|
|
tipc_bclink_acknowledge(n_ptr, msg_bcast_ack(msg));
|
|
}
|
|
|
|
crs = l_ptr->first_out;
|
|
while ((crs != l_ptr->next_out) &&
|
|
less_eq(msg_seqno(buf_msg(crs)), ackd)) {
|
|
struct sk_buff *next = crs->next;
|
|
|
|
buf_discard(crs);
|
|
crs = next;
|
|
released++;
|
|
}
|
|
if (released) {
|
|
l_ptr->first_out = crs;
|
|
l_ptr->out_queue_size -= released;
|
|
}
|
|
if (unlikely(l_ptr->next_out))
|
|
tipc_link_push_queue(l_ptr);
|
|
if (unlikely(!list_empty(&l_ptr->waiting_ports)))
|
|
tipc_link_wakeup_ports(l_ptr, 0);
|
|
if (unlikely(++l_ptr->unacked_window >= TIPC_MIN_LINK_WIN)) {
|
|
l_ptr->stats.sent_acks++;
|
|
tipc_link_send_proto_msg(l_ptr, STATE_MSG, 0, 0, 0, 0, 0);
|
|
}
|
|
|
|
protocol_check:
|
|
if (likely(link_working_working(l_ptr))) {
|
|
if (likely(seq_no == mod(l_ptr->next_in_no))) {
|
|
l_ptr->next_in_no++;
|
|
if (unlikely(l_ptr->oldest_deferred_in))
|
|
head = link_insert_deferred_queue(l_ptr,
|
|
head);
|
|
if (likely(msg_is_dest(msg, tipc_own_addr))) {
|
|
deliver:
|
|
if (likely(msg_isdata(msg))) {
|
|
tipc_node_unlock(n_ptr);
|
|
tipc_port_recv_msg(buf);
|
|
continue;
|
|
}
|
|
switch (msg_user(msg)) {
|
|
case MSG_BUNDLER:
|
|
l_ptr->stats.recv_bundles++;
|
|
l_ptr->stats.recv_bundled +=
|
|
msg_msgcnt(msg);
|
|
tipc_node_unlock(n_ptr);
|
|
tipc_link_recv_bundle(buf);
|
|
continue;
|
|
case ROUTE_DISTRIBUTOR:
|
|
tipc_node_unlock(n_ptr);
|
|
tipc_cltr_recv_routing_table(buf);
|
|
continue;
|
|
case NAME_DISTRIBUTOR:
|
|
tipc_node_unlock(n_ptr);
|
|
tipc_named_recv(buf);
|
|
continue;
|
|
case CONN_MANAGER:
|
|
tipc_node_unlock(n_ptr);
|
|
tipc_port_recv_proto_msg(buf);
|
|
continue;
|
|
case MSG_FRAGMENTER:
|
|
l_ptr->stats.recv_fragments++;
|
|
if (tipc_link_recv_fragment(&l_ptr->defragm_buf,
|
|
&buf, &msg)) {
|
|
l_ptr->stats.recv_fragmented++;
|
|
goto deliver;
|
|
}
|
|
break;
|
|
case CHANGEOVER_PROTOCOL:
|
|
type = msg_type(msg);
|
|
if (link_recv_changeover_msg(&l_ptr, &buf)) {
|
|
msg = buf_msg(buf);
|
|
seq_no = msg_seqno(msg);
|
|
TIPC_SKB_CB(buf)->handle
|
|
= b_ptr;
|
|
if (type == ORIGINAL_MSG)
|
|
goto deliver;
|
|
goto protocol_check;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
tipc_node_unlock(n_ptr);
|
|
tipc_net_route_msg(buf);
|
|
continue;
|
|
}
|
|
link_handle_out_of_seq_msg(l_ptr, buf);
|
|
head = link_insert_deferred_queue(l_ptr, head);
|
|
tipc_node_unlock(n_ptr);
|
|
continue;
|
|
}
|
|
|
|
if (msg_user(msg) == LINK_PROTOCOL) {
|
|
link_recv_proto_msg(l_ptr, buf);
|
|
head = link_insert_deferred_queue(l_ptr, head);
|
|
tipc_node_unlock(n_ptr);
|
|
continue;
|
|
}
|
|
msg_dbg(msg,"NSEQ<REC<");
|
|
link_state_event(l_ptr, TRAFFIC_MSG_EVT);
|
|
|
|
if (link_working_working(l_ptr)) {
|
|
/* Re-insert in front of queue */
|
|
msg_dbg(msg,"RECV-REINS:");
|
|
buf->next = head;
|
|
head = buf;
|
|
tipc_node_unlock(n_ptr);
|
|
continue;
|
|
}
|
|
tipc_node_unlock(n_ptr);
|
|
cont:
|
|
buf_discard(buf);
|
|
}
|
|
read_unlock_bh(&tipc_net_lock);
|
|
}
|
|
|
|
/*
|
|
* link_defer_buf(): Sort a received out-of-sequence packet
|
|
* into the deferred reception queue.
|
|
* Returns the increase of the queue length,i.e. 0 or 1
|
|
*/
|
|
|
|
u32 tipc_link_defer_pkt(struct sk_buff **head,
|
|
struct sk_buff **tail,
|
|
struct sk_buff *buf)
|
|
{
|
|
struct sk_buff *prev = NULL;
|
|
struct sk_buff *crs = *head;
|
|
u32 seq_no = msg_seqno(buf_msg(buf));
|
|
|
|
buf->next = NULL;
|
|
|
|
/* Empty queue ? */
|
|
if (*head == NULL) {
|
|
*head = *tail = buf;
|
|
return 1;
|
|
}
|
|
|
|
/* Last ? */
|
|
if (less(msg_seqno(buf_msg(*tail)), seq_no)) {
|
|
(*tail)->next = buf;
|
|
*tail = buf;
|
|
return 1;
|
|
}
|
|
|
|
/* Scan through queue and sort it in */
|
|
do {
|
|
struct tipc_msg *msg = buf_msg(crs);
|
|
|
|
if (less(seq_no, msg_seqno(msg))) {
|
|
buf->next = crs;
|
|
if (prev)
|
|
prev->next = buf;
|
|
else
|
|
*head = buf;
|
|
return 1;
|
|
}
|
|
if (seq_no == msg_seqno(msg)) {
|
|
break;
|
|
}
|
|
prev = crs;
|
|
crs = crs->next;
|
|
}
|
|
while (crs);
|
|
|
|
/* Message is a duplicate of an existing message */
|
|
|
|
buf_discard(buf);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* link_handle_out_of_seq_msg - handle arrival of out-of-sequence packet
|
|
*/
|
|
|
|
static void link_handle_out_of_seq_msg(struct link *l_ptr,
|
|
struct sk_buff *buf)
|
|
{
|
|
u32 seq_no = msg_seqno(buf_msg(buf));
|
|
|
|
if (likely(msg_user(buf_msg(buf)) == LINK_PROTOCOL)) {
|
|
link_recv_proto_msg(l_ptr, buf);
|
|
return;
|
|
}
|
|
|
|
dbg("rx OOS msg: seq_no %u, expecting %u (%u)\n",
|
|
seq_no, mod(l_ptr->next_in_no), l_ptr->next_in_no);
|
|
|
|
/* Record OOS packet arrival (force mismatch on next timeout) */
|
|
|
|
l_ptr->checkpoint--;
|
|
|
|
/*
|
|
* Discard packet if a duplicate; otherwise add it to deferred queue
|
|
* and notify peer of gap as per protocol specification
|
|
*/
|
|
|
|
if (less(seq_no, mod(l_ptr->next_in_no))) {
|
|
l_ptr->stats.duplicates++;
|
|
buf_discard(buf);
|
|
return;
|
|
}
|
|
|
|
if (tipc_link_defer_pkt(&l_ptr->oldest_deferred_in,
|
|
&l_ptr->newest_deferred_in, buf)) {
|
|
l_ptr->deferred_inqueue_sz++;
|
|
l_ptr->stats.deferred_recv++;
|
|
if ((l_ptr->deferred_inqueue_sz % 16) == 1)
|
|
tipc_link_send_proto_msg(l_ptr, STATE_MSG, 0, 0, 0, 0, 0);
|
|
} else
|
|
l_ptr->stats.duplicates++;
|
|
}
|
|
|
|
/*
|
|
* Send protocol message to the other endpoint.
|
|
*/
|
|
void tipc_link_send_proto_msg(struct link *l_ptr, u32 msg_typ, int probe_msg,
|
|
u32 gap, u32 tolerance, u32 priority, u32 ack_mtu)
|
|
{
|
|
struct sk_buff *buf = NULL;
|
|
struct tipc_msg *msg = l_ptr->pmsg;
|
|
u32 msg_size = sizeof(l_ptr->proto_msg);
|
|
|
|
if (link_blocked(l_ptr))
|
|
return;
|
|
msg_set_type(msg, msg_typ);
|
|
msg_set_net_plane(msg, l_ptr->b_ptr->net_plane);
|
|
msg_set_bcast_ack(msg, mod(l_ptr->owner->bclink.last_in));
|
|
msg_set_last_bcast(msg, tipc_bclink_get_last_sent());
|
|
|
|
if (msg_typ == STATE_MSG) {
|
|
u32 next_sent = mod(l_ptr->next_out_no);
|
|
|
|
if (!tipc_link_is_up(l_ptr))
|
|
return;
|
|
if (l_ptr->next_out)
|
|
next_sent = msg_seqno(buf_msg(l_ptr->next_out));
|
|
msg_set_next_sent(msg, next_sent);
|
|
if (l_ptr->oldest_deferred_in) {
|
|
u32 rec = msg_seqno(buf_msg(l_ptr->oldest_deferred_in));
|
|
gap = mod(rec - mod(l_ptr->next_in_no));
|
|
}
|
|
msg_set_seq_gap(msg, gap);
|
|
if (gap)
|
|
l_ptr->stats.sent_nacks++;
|
|
msg_set_link_tolerance(msg, tolerance);
|
|
msg_set_linkprio(msg, priority);
|
|
msg_set_max_pkt(msg, ack_mtu);
|
|
msg_set_ack(msg, mod(l_ptr->next_in_no - 1));
|
|
msg_set_probe(msg, probe_msg != 0);
|
|
if (probe_msg) {
|
|
u32 mtu = l_ptr->max_pkt;
|
|
|
|
if ((mtu < l_ptr->max_pkt_target) &&
|
|
link_working_working(l_ptr) &&
|
|
l_ptr->fsm_msg_cnt) {
|
|
msg_size = (mtu + (l_ptr->max_pkt_target - mtu)/2 + 2) & ~3;
|
|
if (l_ptr->max_pkt_probes == 10) {
|
|
l_ptr->max_pkt_target = (msg_size - 4);
|
|
l_ptr->max_pkt_probes = 0;
|
|
msg_size = (mtu + (l_ptr->max_pkt_target - mtu)/2 + 2) & ~3;
|
|
}
|
|
l_ptr->max_pkt_probes++;
|
|
}
|
|
|
|
l_ptr->stats.sent_probes++;
|
|
}
|
|
l_ptr->stats.sent_states++;
|
|
} else { /* RESET_MSG or ACTIVATE_MSG */
|
|
msg_set_ack(msg, mod(l_ptr->reset_checkpoint - 1));
|
|
msg_set_seq_gap(msg, 0);
|
|
msg_set_next_sent(msg, 1);
|
|
msg_set_link_tolerance(msg, l_ptr->tolerance);
|
|
msg_set_linkprio(msg, l_ptr->priority);
|
|
msg_set_max_pkt(msg, l_ptr->max_pkt_target);
|
|
}
|
|
|
|
if (tipc_node_has_redundant_links(l_ptr->owner)) {
|
|
msg_set_redundant_link(msg);
|
|
} else {
|
|
msg_clear_redundant_link(msg);
|
|
}
|
|
msg_set_linkprio(msg, l_ptr->priority);
|
|
|
|
/* Ensure sequence number will not fit : */
|
|
|
|
msg_set_seqno(msg, mod(l_ptr->next_out_no + (0xffff/2)));
|
|
|
|
/* Congestion? */
|
|
|
|
if (tipc_bearer_congested(l_ptr->b_ptr, l_ptr)) {
|
|
if (!l_ptr->proto_msg_queue) {
|
|
l_ptr->proto_msg_queue =
|
|
buf_acquire(sizeof(l_ptr->proto_msg));
|
|
}
|
|
buf = l_ptr->proto_msg_queue;
|
|
if (!buf)
|
|
return;
|
|
memcpy(buf->data, (unchar *)msg, sizeof(l_ptr->proto_msg));
|
|
return;
|
|
}
|
|
msg_set_timestamp(msg, jiffies_to_msecs(jiffies));
|
|
|
|
/* Message can be sent */
|
|
|
|
msg_dbg(msg, ">>");
|
|
|
|
buf = buf_acquire(msg_size);
|
|
if (!buf)
|
|
return;
|
|
|
|
memcpy(buf->data, (unchar *)msg, sizeof(l_ptr->proto_msg));
|
|
msg_set_size(buf_msg(buf), msg_size);
|
|
|
|
if (tipc_bearer_send(l_ptr->b_ptr, buf, &l_ptr->media_addr)) {
|
|
l_ptr->unacked_window = 0;
|
|
buf_discard(buf);
|
|
return;
|
|
}
|
|
|
|
/* New congestion */
|
|
tipc_bearer_schedule(l_ptr->b_ptr, l_ptr);
|
|
l_ptr->proto_msg_queue = buf;
|
|
l_ptr->stats.bearer_congs++;
|
|
}
|
|
|
|
/*
|
|
* Receive protocol message :
|
|
* Note that network plane id propagates through the network, and may
|
|
* change at any time. The node with lowest address rules
|
|
*/
|
|
|
|
static void link_recv_proto_msg(struct link *l_ptr, struct sk_buff *buf)
|
|
{
|
|
u32 rec_gap = 0;
|
|
u32 max_pkt_info;
|
|
u32 max_pkt_ack;
|
|
u32 msg_tol;
|
|
struct tipc_msg *msg = buf_msg(buf);
|
|
|
|
dbg("AT(%u):", jiffies_to_msecs(jiffies));
|
|
msg_dbg(msg, "<<");
|
|
if (link_blocked(l_ptr))
|
|
goto exit;
|
|
|
|
/* record unnumbered packet arrival (force mismatch on next timeout) */
|
|
|
|
l_ptr->checkpoint--;
|
|
|
|
if (l_ptr->b_ptr->net_plane != msg_net_plane(msg))
|
|
if (tipc_own_addr > msg_prevnode(msg))
|
|
l_ptr->b_ptr->net_plane = msg_net_plane(msg);
|
|
|
|
l_ptr->owner->permit_changeover = msg_redundant_link(msg);
|
|
|
|
switch (msg_type(msg)) {
|
|
|
|
case RESET_MSG:
|
|
if (!link_working_unknown(l_ptr) && l_ptr->peer_session) {
|
|
if (msg_session(msg) == l_ptr->peer_session) {
|
|
dbg("Duplicate RESET: %u<->%u\n",
|
|
msg_session(msg), l_ptr->peer_session);
|
|
break; /* duplicate: ignore */
|
|
}
|
|
}
|
|
/* fall thru' */
|
|
case ACTIVATE_MSG:
|
|
/* Update link settings according other endpoint's values */
|
|
|
|
strcpy((strrchr(l_ptr->name, ':') + 1), (char *)msg_data(msg));
|
|
|
|
if ((msg_tol = msg_link_tolerance(msg)) &&
|
|
(msg_tol > l_ptr->tolerance))
|
|
link_set_supervision_props(l_ptr, msg_tol);
|
|
|
|
if (msg_linkprio(msg) > l_ptr->priority)
|
|
l_ptr->priority = msg_linkprio(msg);
|
|
|
|
max_pkt_info = msg_max_pkt(msg);
|
|
if (max_pkt_info) {
|
|
if (max_pkt_info < l_ptr->max_pkt_target)
|
|
l_ptr->max_pkt_target = max_pkt_info;
|
|
if (l_ptr->max_pkt > l_ptr->max_pkt_target)
|
|
l_ptr->max_pkt = l_ptr->max_pkt_target;
|
|
} else {
|
|
l_ptr->max_pkt = l_ptr->max_pkt_target;
|
|
}
|
|
l_ptr->owner->bclink.supported = (max_pkt_info != 0);
|
|
|
|
link_state_event(l_ptr, msg_type(msg));
|
|
|
|
l_ptr->peer_session = msg_session(msg);
|
|
l_ptr->peer_bearer_id = msg_bearer_id(msg);
|
|
|
|
/* Synchronize broadcast sequence numbers */
|
|
if (!tipc_node_has_redundant_links(l_ptr->owner)) {
|
|
l_ptr->owner->bclink.last_in = mod(msg_last_bcast(msg));
|
|
}
|
|
break;
|
|
case STATE_MSG:
|
|
|
|
if ((msg_tol = msg_link_tolerance(msg)))
|
|
link_set_supervision_props(l_ptr, msg_tol);
|
|
|
|
if (msg_linkprio(msg) &&
|
|
(msg_linkprio(msg) != l_ptr->priority)) {
|
|
warn("Resetting link <%s>, priority change %u->%u\n",
|
|
l_ptr->name, l_ptr->priority, msg_linkprio(msg));
|
|
l_ptr->priority = msg_linkprio(msg);
|
|
tipc_link_reset(l_ptr); /* Enforce change to take effect */
|
|
break;
|
|
}
|
|
link_state_event(l_ptr, TRAFFIC_MSG_EVT);
|
|
l_ptr->stats.recv_states++;
|
|
if (link_reset_unknown(l_ptr))
|
|
break;
|
|
|
|
if (less_eq(mod(l_ptr->next_in_no), msg_next_sent(msg))) {
|
|
rec_gap = mod(msg_next_sent(msg) -
|
|
mod(l_ptr->next_in_no));
|
|
}
|
|
|
|
max_pkt_ack = msg_max_pkt(msg);
|
|
if (max_pkt_ack > l_ptr->max_pkt) {
|
|
dbg("Link <%s> updated MTU %u -> %u\n",
|
|
l_ptr->name, l_ptr->max_pkt, max_pkt_ack);
|
|
l_ptr->max_pkt = max_pkt_ack;
|
|
l_ptr->max_pkt_probes = 0;
|
|
}
|
|
|
|
max_pkt_ack = 0;
|
|
if (msg_probe(msg)) {
|
|
l_ptr->stats.recv_probes++;
|
|
if (msg_size(msg) > sizeof(l_ptr->proto_msg)) {
|
|
max_pkt_ack = msg_size(msg);
|
|
}
|
|
}
|
|
|
|
/* Protocol message before retransmits, reduce loss risk */
|
|
|
|
tipc_bclink_check_gap(l_ptr->owner, msg_last_bcast(msg));
|
|
|
|
if (rec_gap || (msg_probe(msg))) {
|
|
tipc_link_send_proto_msg(l_ptr, STATE_MSG,
|
|
0, rec_gap, 0, 0, max_pkt_ack);
|
|
}
|
|
if (msg_seq_gap(msg)) {
|
|
msg_dbg(msg, "With Gap:");
|
|
l_ptr->stats.recv_nacks++;
|
|
tipc_link_retransmit(l_ptr, l_ptr->first_out,
|
|
msg_seq_gap(msg));
|
|
}
|
|
break;
|
|
default:
|
|
msg_dbg(buf_msg(buf), "<DISCARDING UNKNOWN<");
|
|
}
|
|
exit:
|
|
buf_discard(buf);
|
|
}
|
|
|
|
|
|
/*
|
|
* tipc_link_tunnel(): Send one message via a link belonging to
|
|
* another bearer. Owner node is locked.
|
|
*/
|
|
void tipc_link_tunnel(struct link *l_ptr,
|
|
struct tipc_msg *tunnel_hdr,
|
|
struct tipc_msg *msg,
|
|
u32 selector)
|
|
{
|
|
struct link *tunnel;
|
|
struct sk_buff *buf;
|
|
u32 length = msg_size(msg);
|
|
|
|
tunnel = l_ptr->owner->active_links[selector & 1];
|
|
if (!tipc_link_is_up(tunnel)) {
|
|
warn("Link changeover error, "
|
|
"tunnel link no longer available\n");
|
|
return;
|
|
}
|
|
msg_set_size(tunnel_hdr, length + INT_H_SIZE);
|
|
buf = buf_acquire(length + INT_H_SIZE);
|
|
if (!buf) {
|
|
warn("Link changeover error, "
|
|
"unable to send tunnel msg\n");
|
|
return;
|
|
}
|
|
memcpy(buf->data, (unchar *)tunnel_hdr, INT_H_SIZE);
|
|
memcpy(buf->data + INT_H_SIZE, (unchar *)msg, length);
|
|
dbg("%c->%c:", l_ptr->b_ptr->net_plane, tunnel->b_ptr->net_plane);
|
|
msg_dbg(buf_msg(buf), ">SEND>");
|
|
tipc_link_send_buf(tunnel, buf);
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* changeover(): Send whole message queue via the remaining link
|
|
* Owner node is locked.
|
|
*/
|
|
|
|
void tipc_link_changeover(struct link *l_ptr)
|
|
{
|
|
u32 msgcount = l_ptr->out_queue_size;
|
|
struct sk_buff *crs = l_ptr->first_out;
|
|
struct link *tunnel = l_ptr->owner->active_links[0];
|
|
struct tipc_msg tunnel_hdr;
|
|
int split_bundles;
|
|
|
|
if (!tunnel)
|
|
return;
|
|
|
|
if (!l_ptr->owner->permit_changeover) {
|
|
warn("Link changeover error, "
|
|
"peer did not permit changeover\n");
|
|
return;
|
|
}
|
|
|
|
msg_init(&tunnel_hdr, CHANGEOVER_PROTOCOL,
|
|
ORIGINAL_MSG, TIPC_OK, INT_H_SIZE, l_ptr->addr);
|
|
msg_set_bearer_id(&tunnel_hdr, l_ptr->peer_bearer_id);
|
|
msg_set_msgcnt(&tunnel_hdr, msgcount);
|
|
dbg("Link changeover requires %u tunnel messages\n", msgcount);
|
|
|
|
if (!l_ptr->first_out) {
|
|
struct sk_buff *buf;
|
|
|
|
buf = buf_acquire(INT_H_SIZE);
|
|
if (buf) {
|
|
memcpy(buf->data, (unchar *)&tunnel_hdr, INT_H_SIZE);
|
|
msg_set_size(&tunnel_hdr, INT_H_SIZE);
|
|
dbg("%c->%c:", l_ptr->b_ptr->net_plane,
|
|
tunnel->b_ptr->net_plane);
|
|
msg_dbg(&tunnel_hdr, "EMPTY>SEND>");
|
|
tipc_link_send_buf(tunnel, buf);
|
|
} else {
|
|
warn("Link changeover error, "
|
|
"unable to send changeover msg\n");
|
|
}
|
|
return;
|
|
}
|
|
|
|
split_bundles = (l_ptr->owner->active_links[0] !=
|
|
l_ptr->owner->active_links[1]);
|
|
|
|
while (crs) {
|
|
struct tipc_msg *msg = buf_msg(crs);
|
|
|
|
if ((msg_user(msg) == MSG_BUNDLER) && split_bundles) {
|
|
u32 msgcount = msg_msgcnt(msg);
|
|
struct tipc_msg *m = msg_get_wrapped(msg);
|
|
unchar* pos = (unchar*)m;
|
|
|
|
while (msgcount--) {
|
|
msg_set_seqno(m,msg_seqno(msg));
|
|
tipc_link_tunnel(l_ptr, &tunnel_hdr, m,
|
|
msg_link_selector(m));
|
|
pos += align(msg_size(m));
|
|
m = (struct tipc_msg *)pos;
|
|
}
|
|
} else {
|
|
tipc_link_tunnel(l_ptr, &tunnel_hdr, msg,
|
|
msg_link_selector(msg));
|
|
}
|
|
crs = crs->next;
|
|
}
|
|
}
|
|
|
|
void tipc_link_send_duplicate(struct link *l_ptr, struct link *tunnel)
|
|
{
|
|
struct sk_buff *iter;
|
|
struct tipc_msg tunnel_hdr;
|
|
|
|
msg_init(&tunnel_hdr, CHANGEOVER_PROTOCOL,
|
|
DUPLICATE_MSG, TIPC_OK, INT_H_SIZE, l_ptr->addr);
|
|
msg_set_msgcnt(&tunnel_hdr, l_ptr->out_queue_size);
|
|
msg_set_bearer_id(&tunnel_hdr, l_ptr->peer_bearer_id);
|
|
iter = l_ptr->first_out;
|
|
while (iter) {
|
|
struct sk_buff *outbuf;
|
|
struct tipc_msg *msg = buf_msg(iter);
|
|
u32 length = msg_size(msg);
|
|
|
|
if (msg_user(msg) == MSG_BUNDLER)
|
|
msg_set_type(msg, CLOSED_MSG);
|
|
msg_set_ack(msg, mod(l_ptr->next_in_no - 1)); /* Update */
|
|
msg_set_bcast_ack(msg, l_ptr->owner->bclink.last_in);
|
|
msg_set_size(&tunnel_hdr, length + INT_H_SIZE);
|
|
outbuf = buf_acquire(length + INT_H_SIZE);
|
|
if (outbuf == NULL) {
|
|
warn("Link changeover error, "
|
|
"unable to send duplicate msg\n");
|
|
return;
|
|
}
|
|
memcpy(outbuf->data, (unchar *)&tunnel_hdr, INT_H_SIZE);
|
|
memcpy(outbuf->data + INT_H_SIZE, iter->data, length);
|
|
dbg("%c->%c:", l_ptr->b_ptr->net_plane,
|
|
tunnel->b_ptr->net_plane);
|
|
msg_dbg(buf_msg(outbuf), ">SEND>");
|
|
tipc_link_send_buf(tunnel, outbuf);
|
|
if (!tipc_link_is_up(l_ptr))
|
|
return;
|
|
iter = iter->next;
|
|
}
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
* buf_extract - extracts embedded TIPC message from another message
|
|
* @skb: encapsulating message buffer
|
|
* @from_pos: offset to extract from
|
|
*
|
|
* Returns a new message buffer containing an embedded message. The
|
|
* encapsulating message itself is left unchanged.
|
|
*/
|
|
|
|
static struct sk_buff *buf_extract(struct sk_buff *skb, u32 from_pos)
|
|
{
|
|
struct tipc_msg *msg = (struct tipc_msg *)(skb->data + from_pos);
|
|
u32 size = msg_size(msg);
|
|
struct sk_buff *eb;
|
|
|
|
eb = buf_acquire(size);
|
|
if (eb)
|
|
memcpy(eb->data, (unchar *)msg, size);
|
|
return eb;
|
|
}
|
|
|
|
/*
|
|
* link_recv_changeover_msg(): Receive tunneled packet sent
|
|
* via other link. Node is locked. Return extracted buffer.
|
|
*/
|
|
|
|
static int link_recv_changeover_msg(struct link **l_ptr,
|
|
struct sk_buff **buf)
|
|
{
|
|
struct sk_buff *tunnel_buf = *buf;
|
|
struct link *dest_link;
|
|
struct tipc_msg *msg;
|
|
struct tipc_msg *tunnel_msg = buf_msg(tunnel_buf);
|
|
u32 msg_typ = msg_type(tunnel_msg);
|
|
u32 msg_count = msg_msgcnt(tunnel_msg);
|
|
|
|
dest_link = (*l_ptr)->owner->links[msg_bearer_id(tunnel_msg)];
|
|
if (!dest_link) {
|
|
msg_dbg(tunnel_msg, "NOLINK/<REC<");
|
|
goto exit;
|
|
}
|
|
if (dest_link == *l_ptr) {
|
|
err("Unexpected changeover message on link <%s>\n",
|
|
(*l_ptr)->name);
|
|
goto exit;
|
|
}
|
|
dbg("%c<-%c:", dest_link->b_ptr->net_plane,
|
|
(*l_ptr)->b_ptr->net_plane);
|
|
*l_ptr = dest_link;
|
|
msg = msg_get_wrapped(tunnel_msg);
|
|
|
|
if (msg_typ == DUPLICATE_MSG) {
|
|
if (less(msg_seqno(msg), mod(dest_link->next_in_no))) {
|
|
msg_dbg(tunnel_msg, "DROP/<REC<");
|
|
goto exit;
|
|
}
|
|
*buf = buf_extract(tunnel_buf,INT_H_SIZE);
|
|
if (*buf == NULL) {
|
|
warn("Link changeover error, duplicate msg dropped\n");
|
|
goto exit;
|
|
}
|
|
msg_dbg(tunnel_msg, "TNL<REC<");
|
|
buf_discard(tunnel_buf);
|
|
return 1;
|
|
}
|
|
|
|
/* First original message ?: */
|
|
|
|
if (tipc_link_is_up(dest_link)) {
|
|
msg_dbg(tunnel_msg, "UP/FIRST/<REC<");
|
|
info("Resetting link <%s>, changeover initiated by peer\n",
|
|
dest_link->name);
|
|
tipc_link_reset(dest_link);
|
|
dest_link->exp_msg_count = msg_count;
|
|
dbg("Expecting %u tunnelled messages\n", msg_count);
|
|
if (!msg_count)
|
|
goto exit;
|
|
} else if (dest_link->exp_msg_count == START_CHANGEOVER) {
|
|
msg_dbg(tunnel_msg, "BLK/FIRST/<REC<");
|
|
dest_link->exp_msg_count = msg_count;
|
|
dbg("Expecting %u tunnelled messages\n", msg_count);
|
|
if (!msg_count)
|
|
goto exit;
|
|
}
|
|
|
|
/* Receive original message */
|
|
|
|
if (dest_link->exp_msg_count == 0) {
|
|
warn("Link switchover error, "
|
|
"got too many tunnelled messages\n");
|
|
msg_dbg(tunnel_msg, "OVERDUE/DROP/<REC<");
|
|
dbg_print_link(dest_link, "LINK:");
|
|
goto exit;
|
|
}
|
|
dest_link->exp_msg_count--;
|
|
if (less(msg_seqno(msg), dest_link->reset_checkpoint)) {
|
|
msg_dbg(tunnel_msg, "DROP/DUPL/<REC<");
|
|
goto exit;
|
|
} else {
|
|
*buf = buf_extract(tunnel_buf, INT_H_SIZE);
|
|
if (*buf != NULL) {
|
|
msg_dbg(tunnel_msg, "TNL<REC<");
|
|
buf_discard(tunnel_buf);
|
|
return 1;
|
|
} else {
|
|
warn("Link changeover error, original msg dropped\n");
|
|
}
|
|
}
|
|
exit:
|
|
*buf = NULL;
|
|
buf_discard(tunnel_buf);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Bundler functionality:
|
|
*/
|
|
void tipc_link_recv_bundle(struct sk_buff *buf)
|
|
{
|
|
u32 msgcount = msg_msgcnt(buf_msg(buf));
|
|
u32 pos = INT_H_SIZE;
|
|
struct sk_buff *obuf;
|
|
|
|
msg_dbg(buf_msg(buf), "<BNDL<: ");
|
|
while (msgcount--) {
|
|
obuf = buf_extract(buf, pos);
|
|
if (obuf == NULL) {
|
|
warn("Link unable to unbundle message(s)\n");
|
|
break;
|
|
};
|
|
pos += align(msg_size(buf_msg(obuf)));
|
|
msg_dbg(buf_msg(obuf), " /");
|
|
tipc_net_route_msg(obuf);
|
|
}
|
|
buf_discard(buf);
|
|
}
|
|
|
|
/*
|
|
* Fragmentation/defragmentation:
|
|
*/
|
|
|
|
|
|
/*
|
|
* tipc_link_send_long_buf: Entry for buffers needing fragmentation.
|
|
* The buffer is complete, inclusive total message length.
|
|
* Returns user data length.
|
|
*/
|
|
int tipc_link_send_long_buf(struct link *l_ptr, struct sk_buff *buf)
|
|
{
|
|
struct tipc_msg *inmsg = buf_msg(buf);
|
|
struct tipc_msg fragm_hdr;
|
|
u32 insize = msg_size(inmsg);
|
|
u32 dsz = msg_data_sz(inmsg);
|
|
unchar *crs = buf->data;
|
|
u32 rest = insize;
|
|
u32 pack_sz = link_max_pkt(l_ptr);
|
|
u32 fragm_sz = pack_sz - INT_H_SIZE;
|
|
u32 fragm_no = 1;
|
|
u32 destaddr = msg_destnode(inmsg);
|
|
|
|
if (msg_short(inmsg))
|
|
destaddr = l_ptr->addr;
|
|
|
|
if (msg_routed(inmsg))
|
|
msg_set_prevnode(inmsg, tipc_own_addr);
|
|
|
|
/* Prepare reusable fragment header: */
|
|
|
|
msg_init(&fragm_hdr, MSG_FRAGMENTER, FIRST_FRAGMENT,
|
|
TIPC_OK, INT_H_SIZE, destaddr);
|
|
msg_set_link_selector(&fragm_hdr, msg_link_selector(inmsg));
|
|
msg_set_long_msgno(&fragm_hdr, mod(l_ptr->long_msg_seq_no++));
|
|
msg_set_fragm_no(&fragm_hdr, fragm_no);
|
|
l_ptr->stats.sent_fragmented++;
|
|
|
|
/* Chop up message: */
|
|
|
|
while (rest > 0) {
|
|
struct sk_buff *fragm;
|
|
|
|
if (rest <= fragm_sz) {
|
|
fragm_sz = rest;
|
|
msg_set_type(&fragm_hdr, LAST_FRAGMENT);
|
|
}
|
|
fragm = buf_acquire(fragm_sz + INT_H_SIZE);
|
|
if (fragm == NULL) {
|
|
warn("Link unable to fragment message\n");
|
|
dsz = -ENOMEM;
|
|
goto exit;
|
|
}
|
|
msg_set_size(&fragm_hdr, fragm_sz + INT_H_SIZE);
|
|
memcpy(fragm->data, (unchar *)&fragm_hdr, INT_H_SIZE);
|
|
memcpy(fragm->data + INT_H_SIZE, crs, fragm_sz);
|
|
|
|
/* Send queued messages first, if any: */
|
|
|
|
l_ptr->stats.sent_fragments++;
|
|
tipc_link_send_buf(l_ptr, fragm);
|
|
if (!tipc_link_is_up(l_ptr))
|
|
return dsz;
|
|
msg_set_fragm_no(&fragm_hdr, ++fragm_no);
|
|
rest -= fragm_sz;
|
|
crs += fragm_sz;
|
|
msg_set_type(&fragm_hdr, FRAGMENT);
|
|
}
|
|
exit:
|
|
buf_discard(buf);
|
|
return dsz;
|
|
}
|
|
|
|
/*
|
|
* A pending message being re-assembled must store certain values
|
|
* to handle subsequent fragments correctly. The following functions
|
|
* help storing these values in unused, available fields in the
|
|
* pending message. This makes dynamic memory allocation unecessary.
|
|
*/
|
|
|
|
static void set_long_msg_seqno(struct sk_buff *buf, u32 seqno)
|
|
{
|
|
msg_set_seqno(buf_msg(buf), seqno);
|
|
}
|
|
|
|
static u32 get_fragm_size(struct sk_buff *buf)
|
|
{
|
|
return msg_ack(buf_msg(buf));
|
|
}
|
|
|
|
static void set_fragm_size(struct sk_buff *buf, u32 sz)
|
|
{
|
|
msg_set_ack(buf_msg(buf), sz);
|
|
}
|
|
|
|
static u32 get_expected_frags(struct sk_buff *buf)
|
|
{
|
|
return msg_bcast_ack(buf_msg(buf));
|
|
}
|
|
|
|
static void set_expected_frags(struct sk_buff *buf, u32 exp)
|
|
{
|
|
msg_set_bcast_ack(buf_msg(buf), exp);
|
|
}
|
|
|
|
static u32 get_timer_cnt(struct sk_buff *buf)
|
|
{
|
|
return msg_reroute_cnt(buf_msg(buf));
|
|
}
|
|
|
|
static void incr_timer_cnt(struct sk_buff *buf)
|
|
{
|
|
msg_incr_reroute_cnt(buf_msg(buf));
|
|
}
|
|
|
|
/*
|
|
* tipc_link_recv_fragment(): Called with node lock on. Returns
|
|
* the reassembled buffer if message is complete.
|
|
*/
|
|
int tipc_link_recv_fragment(struct sk_buff **pending, struct sk_buff **fb,
|
|
struct tipc_msg **m)
|
|
{
|
|
struct sk_buff *prev = NULL;
|
|
struct sk_buff *fbuf = *fb;
|
|
struct tipc_msg *fragm = buf_msg(fbuf);
|
|
struct sk_buff *pbuf = *pending;
|
|
u32 long_msg_seq_no = msg_long_msgno(fragm);
|
|
|
|
*fb = NULL;
|
|
msg_dbg(fragm,"FRG<REC<");
|
|
|
|
/* Is there an incomplete message waiting for this fragment? */
|
|
|
|
while (pbuf && ((msg_seqno(buf_msg(pbuf)) != long_msg_seq_no)
|
|
|| (msg_orignode(fragm) != msg_orignode(buf_msg(pbuf))))) {
|
|
prev = pbuf;
|
|
pbuf = pbuf->next;
|
|
}
|
|
|
|
if (!pbuf && (msg_type(fragm) == FIRST_FRAGMENT)) {
|
|
struct tipc_msg *imsg = (struct tipc_msg *)msg_data(fragm);
|
|
u32 msg_sz = msg_size(imsg);
|
|
u32 fragm_sz = msg_data_sz(fragm);
|
|
u32 exp_fragm_cnt = msg_sz/fragm_sz + !!(msg_sz % fragm_sz);
|
|
u32 max = TIPC_MAX_USER_MSG_SIZE + LONG_H_SIZE;
|
|
if (msg_type(imsg) == TIPC_MCAST_MSG)
|
|
max = TIPC_MAX_USER_MSG_SIZE + MCAST_H_SIZE;
|
|
if (msg_size(imsg) > max) {
|
|
msg_dbg(fragm,"<REC<Oversized: ");
|
|
buf_discard(fbuf);
|
|
return 0;
|
|
}
|
|
pbuf = buf_acquire(msg_size(imsg));
|
|
if (pbuf != NULL) {
|
|
pbuf->next = *pending;
|
|
*pending = pbuf;
|
|
memcpy(pbuf->data, (unchar *)imsg, msg_data_sz(fragm));
|
|
|
|
/* Prepare buffer for subsequent fragments. */
|
|
|
|
set_long_msg_seqno(pbuf, long_msg_seq_no);
|
|
set_fragm_size(pbuf,fragm_sz);
|
|
set_expected_frags(pbuf,exp_fragm_cnt - 1);
|
|
} else {
|
|
warn("Link unable to reassemble fragmented message\n");
|
|
}
|
|
buf_discard(fbuf);
|
|
return 0;
|
|
} else if (pbuf && (msg_type(fragm) != FIRST_FRAGMENT)) {
|
|
u32 dsz = msg_data_sz(fragm);
|
|
u32 fsz = get_fragm_size(pbuf);
|
|
u32 crs = ((msg_fragm_no(fragm) - 1) * fsz);
|
|
u32 exp_frags = get_expected_frags(pbuf) - 1;
|
|
memcpy(pbuf->data + crs, msg_data(fragm), dsz);
|
|
buf_discard(fbuf);
|
|
|
|
/* Is message complete? */
|
|
|
|
if (exp_frags == 0) {
|
|
if (prev)
|
|
prev->next = pbuf->next;
|
|
else
|
|
*pending = pbuf->next;
|
|
msg_reset_reroute_cnt(buf_msg(pbuf));
|
|
*fb = pbuf;
|
|
*m = buf_msg(pbuf);
|
|
return 1;
|
|
}
|
|
set_expected_frags(pbuf,exp_frags);
|
|
return 0;
|
|
}
|
|
dbg(" Discarding orphan fragment %x\n",fbuf);
|
|
msg_dbg(fragm,"ORPHAN:");
|
|
dbg("Pending long buffers:\n");
|
|
dbg_print_buf_chain(*pending);
|
|
buf_discard(fbuf);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* link_check_defragm_bufs - flush stale incoming message fragments
|
|
* @l_ptr: pointer to link
|
|
*/
|
|
|
|
static void link_check_defragm_bufs(struct link *l_ptr)
|
|
{
|
|
struct sk_buff *prev = NULL;
|
|
struct sk_buff *next = NULL;
|
|
struct sk_buff *buf = l_ptr->defragm_buf;
|
|
|
|
if (!buf)
|
|
return;
|
|
if (!link_working_working(l_ptr))
|
|
return;
|
|
while (buf) {
|
|
u32 cnt = get_timer_cnt(buf);
|
|
|
|
next = buf->next;
|
|
if (cnt < 4) {
|
|
incr_timer_cnt(buf);
|
|
prev = buf;
|
|
} else {
|
|
dbg(" Discarding incomplete long buffer\n");
|
|
msg_dbg(buf_msg(buf), "LONG:");
|
|
dbg_print_link(l_ptr, "curr:");
|
|
dbg("Pending long buffers:\n");
|
|
dbg_print_buf_chain(l_ptr->defragm_buf);
|
|
if (prev)
|
|
prev->next = buf->next;
|
|
else
|
|
l_ptr->defragm_buf = buf->next;
|
|
buf_discard(buf);
|
|
}
|
|
buf = next;
|
|
}
|
|
}
|
|
|
|
|
|
|
|
static void link_set_supervision_props(struct link *l_ptr, u32 tolerance)
|
|
{
|
|
l_ptr->tolerance = tolerance;
|
|
l_ptr->continuity_interval =
|
|
((tolerance / 4) > 500) ? 500 : tolerance / 4;
|
|
l_ptr->abort_limit = tolerance / (l_ptr->continuity_interval / 4);
|
|
}
|
|
|
|
|
|
void tipc_link_set_queue_limits(struct link *l_ptr, u32 window)
|
|
{
|
|
/* Data messages from this node, inclusive FIRST_FRAGM */
|
|
l_ptr->queue_limit[DATA_LOW] = window;
|
|
l_ptr->queue_limit[DATA_MEDIUM] = (window / 3) * 4;
|
|
l_ptr->queue_limit[DATA_HIGH] = (window / 3) * 5;
|
|
l_ptr->queue_limit[DATA_CRITICAL] = (window / 3) * 6;
|
|
/* Transiting data messages,inclusive FIRST_FRAGM */
|
|
l_ptr->queue_limit[DATA_LOW + 4] = 300;
|
|
l_ptr->queue_limit[DATA_MEDIUM + 4] = 600;
|
|
l_ptr->queue_limit[DATA_HIGH + 4] = 900;
|
|
l_ptr->queue_limit[DATA_CRITICAL + 4] = 1200;
|
|
l_ptr->queue_limit[CONN_MANAGER] = 1200;
|
|
l_ptr->queue_limit[ROUTE_DISTRIBUTOR] = 1200;
|
|
l_ptr->queue_limit[CHANGEOVER_PROTOCOL] = 2500;
|
|
l_ptr->queue_limit[NAME_DISTRIBUTOR] = 3000;
|
|
/* FRAGMENT and LAST_FRAGMENT packets */
|
|
l_ptr->queue_limit[MSG_FRAGMENTER] = 4000;
|
|
}
|
|
|
|
/**
|
|
* link_find_link - locate link by name
|
|
* @name - ptr to link name string
|
|
* @node - ptr to area to be filled with ptr to associated node
|
|
*
|
|
* Caller must hold 'tipc_net_lock' to ensure node and bearer are not deleted;
|
|
* this also prevents link deletion.
|
|
*
|
|
* Returns pointer to link (or 0 if invalid link name).
|
|
*/
|
|
|
|
static struct link *link_find_link(const char *name, struct node **node)
|
|
{
|
|
struct link_name link_name_parts;
|
|
struct bearer *b_ptr;
|
|
struct link *l_ptr;
|
|
|
|
if (!link_name_validate(name, &link_name_parts))
|
|
return NULL;
|
|
|
|
b_ptr = tipc_bearer_find_interface(link_name_parts.if_local);
|
|
if (!b_ptr)
|
|
return NULL;
|
|
|
|
*node = tipc_node_find(link_name_parts.addr_peer);
|
|
if (!*node)
|
|
return NULL;
|
|
|
|
l_ptr = (*node)->links[b_ptr->identity];
|
|
if (!l_ptr || strcmp(l_ptr->name, name))
|
|
return NULL;
|
|
|
|
return l_ptr;
|
|
}
|
|
|
|
struct sk_buff *tipc_link_cmd_config(const void *req_tlv_area, int req_tlv_space,
|
|
u16 cmd)
|
|
{
|
|
struct tipc_link_config *args;
|
|
u32 new_value;
|
|
struct link *l_ptr;
|
|
struct node *node;
|
|
int res;
|
|
|
|
if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_LINK_CONFIG))
|
|
return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
|
|
|
|
args = (struct tipc_link_config *)TLV_DATA(req_tlv_area);
|
|
new_value = ntohl(args->value);
|
|
|
|
if (!strcmp(args->name, tipc_bclink_name)) {
|
|
if ((cmd == TIPC_CMD_SET_LINK_WINDOW) &&
|
|
(tipc_bclink_set_queue_limits(new_value) == 0))
|
|
return tipc_cfg_reply_none();
|
|
return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
|
|
" (cannot change setting on broadcast link)");
|
|
}
|
|
|
|
read_lock_bh(&tipc_net_lock);
|
|
l_ptr = link_find_link(args->name, &node);
|
|
if (!l_ptr) {
|
|
read_unlock_bh(&tipc_net_lock);
|
|
return tipc_cfg_reply_error_string("link not found");
|
|
}
|
|
|
|
tipc_node_lock(node);
|
|
res = -EINVAL;
|
|
switch (cmd) {
|
|
case TIPC_CMD_SET_LINK_TOL:
|
|
if ((new_value >= TIPC_MIN_LINK_TOL) &&
|
|
(new_value <= TIPC_MAX_LINK_TOL)) {
|
|
link_set_supervision_props(l_ptr, new_value);
|
|
tipc_link_send_proto_msg(l_ptr, STATE_MSG,
|
|
0, 0, new_value, 0, 0);
|
|
res = TIPC_OK;
|
|
}
|
|
break;
|
|
case TIPC_CMD_SET_LINK_PRI:
|
|
if ((new_value >= TIPC_MIN_LINK_PRI) &&
|
|
(new_value <= TIPC_MAX_LINK_PRI)) {
|
|
l_ptr->priority = new_value;
|
|
tipc_link_send_proto_msg(l_ptr, STATE_MSG,
|
|
0, 0, 0, new_value, 0);
|
|
res = TIPC_OK;
|
|
}
|
|
break;
|
|
case TIPC_CMD_SET_LINK_WINDOW:
|
|
if ((new_value >= TIPC_MIN_LINK_WIN) &&
|
|
(new_value <= TIPC_MAX_LINK_WIN)) {
|
|
tipc_link_set_queue_limits(l_ptr, new_value);
|
|
res = TIPC_OK;
|
|
}
|
|
break;
|
|
}
|
|
tipc_node_unlock(node);
|
|
|
|
read_unlock_bh(&tipc_net_lock);
|
|
if (res)
|
|
return tipc_cfg_reply_error_string("cannot change link setting");
|
|
|
|
return tipc_cfg_reply_none();
|
|
}
|
|
|
|
/**
|
|
* link_reset_statistics - reset link statistics
|
|
* @l_ptr: pointer to link
|
|
*/
|
|
|
|
static void link_reset_statistics(struct link *l_ptr)
|
|
{
|
|
memset(&l_ptr->stats, 0, sizeof(l_ptr->stats));
|
|
l_ptr->stats.sent_info = l_ptr->next_out_no;
|
|
l_ptr->stats.recv_info = l_ptr->next_in_no;
|
|
}
|
|
|
|
struct sk_buff *tipc_link_cmd_reset_stats(const void *req_tlv_area, int req_tlv_space)
|
|
{
|
|
char *link_name;
|
|
struct link *l_ptr;
|
|
struct node *node;
|
|
|
|
if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_LINK_NAME))
|
|
return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
|
|
|
|
link_name = (char *)TLV_DATA(req_tlv_area);
|
|
if (!strcmp(link_name, tipc_bclink_name)) {
|
|
if (tipc_bclink_reset_stats())
|
|
return tipc_cfg_reply_error_string("link not found");
|
|
return tipc_cfg_reply_none();
|
|
}
|
|
|
|
read_lock_bh(&tipc_net_lock);
|
|
l_ptr = link_find_link(link_name, &node);
|
|
if (!l_ptr) {
|
|
read_unlock_bh(&tipc_net_lock);
|
|
return tipc_cfg_reply_error_string("link not found");
|
|
}
|
|
|
|
tipc_node_lock(node);
|
|
link_reset_statistics(l_ptr);
|
|
tipc_node_unlock(node);
|
|
read_unlock_bh(&tipc_net_lock);
|
|
return tipc_cfg_reply_none();
|
|
}
|
|
|
|
/**
|
|
* percent - convert count to a percentage of total (rounding up or down)
|
|
*/
|
|
|
|
static u32 percent(u32 count, u32 total)
|
|
{
|
|
return (count * 100 + (total / 2)) / total;
|
|
}
|
|
|
|
/**
|
|
* tipc_link_stats - print link statistics
|
|
* @name: link name
|
|
* @buf: print buffer area
|
|
* @buf_size: size of print buffer area
|
|
*
|
|
* Returns length of print buffer data string (or 0 if error)
|
|
*/
|
|
|
|
static int tipc_link_stats(const char *name, char *buf, const u32 buf_size)
|
|
{
|
|
struct print_buf pb;
|
|
struct link *l_ptr;
|
|
struct node *node;
|
|
char *status;
|
|
u32 profile_total = 0;
|
|
|
|
if (!strcmp(name, tipc_bclink_name))
|
|
return tipc_bclink_stats(buf, buf_size);
|
|
|
|
tipc_printbuf_init(&pb, buf, buf_size);
|
|
|
|
read_lock_bh(&tipc_net_lock);
|
|
l_ptr = link_find_link(name, &node);
|
|
if (!l_ptr) {
|
|
read_unlock_bh(&tipc_net_lock);
|
|
return 0;
|
|
}
|
|
tipc_node_lock(node);
|
|
|
|
if (tipc_link_is_active(l_ptr))
|
|
status = "ACTIVE";
|
|
else if (tipc_link_is_up(l_ptr))
|
|
status = "STANDBY";
|
|
else
|
|
status = "DEFUNCT";
|
|
tipc_printf(&pb, "Link <%s>\n"
|
|
" %s MTU:%u Priority:%u Tolerance:%u ms"
|
|
" Window:%u packets\n",
|
|
l_ptr->name, status, link_max_pkt(l_ptr),
|
|
l_ptr->priority, l_ptr->tolerance, l_ptr->queue_limit[0]);
|
|
tipc_printf(&pb, " RX packets:%u fragments:%u/%u bundles:%u/%u\n",
|
|
l_ptr->next_in_no - l_ptr->stats.recv_info,
|
|
l_ptr->stats.recv_fragments,
|
|
l_ptr->stats.recv_fragmented,
|
|
l_ptr->stats.recv_bundles,
|
|
l_ptr->stats.recv_bundled);
|
|
tipc_printf(&pb, " TX packets:%u fragments:%u/%u bundles:%u/%u\n",
|
|
l_ptr->next_out_no - l_ptr->stats.sent_info,
|
|
l_ptr->stats.sent_fragments,
|
|
l_ptr->stats.sent_fragmented,
|
|
l_ptr->stats.sent_bundles,
|
|
l_ptr->stats.sent_bundled);
|
|
profile_total = l_ptr->stats.msg_length_counts;
|
|
if (!profile_total)
|
|
profile_total = 1;
|
|
tipc_printf(&pb, " TX profile sample:%u packets average:%u octets\n"
|
|
" 0-64:%u%% -256:%u%% -1024:%u%% -4096:%u%% "
|
|
"-16354:%u%% -32768:%u%% -66000:%u%%\n",
|
|
l_ptr->stats.msg_length_counts,
|
|
l_ptr->stats.msg_lengths_total / profile_total,
|
|
percent(l_ptr->stats.msg_length_profile[0], profile_total),
|
|
percent(l_ptr->stats.msg_length_profile[1], profile_total),
|
|
percent(l_ptr->stats.msg_length_profile[2], profile_total),
|
|
percent(l_ptr->stats.msg_length_profile[3], profile_total),
|
|
percent(l_ptr->stats.msg_length_profile[4], profile_total),
|
|
percent(l_ptr->stats.msg_length_profile[5], profile_total),
|
|
percent(l_ptr->stats.msg_length_profile[6], profile_total));
|
|
tipc_printf(&pb, " RX states:%u probes:%u naks:%u defs:%u dups:%u\n",
|
|
l_ptr->stats.recv_states,
|
|
l_ptr->stats.recv_probes,
|
|
l_ptr->stats.recv_nacks,
|
|
l_ptr->stats.deferred_recv,
|
|
l_ptr->stats.duplicates);
|
|
tipc_printf(&pb, " TX states:%u probes:%u naks:%u acks:%u dups:%u\n",
|
|
l_ptr->stats.sent_states,
|
|
l_ptr->stats.sent_probes,
|
|
l_ptr->stats.sent_nacks,
|
|
l_ptr->stats.sent_acks,
|
|
l_ptr->stats.retransmitted);
|
|
tipc_printf(&pb, " Congestion bearer:%u link:%u Send queue max:%u avg:%u\n",
|
|
l_ptr->stats.bearer_congs,
|
|
l_ptr->stats.link_congs,
|
|
l_ptr->stats.max_queue_sz,
|
|
l_ptr->stats.queue_sz_counts
|
|
? (l_ptr->stats.accu_queue_sz / l_ptr->stats.queue_sz_counts)
|
|
: 0);
|
|
|
|
tipc_node_unlock(node);
|
|
read_unlock_bh(&tipc_net_lock);
|
|
return tipc_printbuf_validate(&pb);
|
|
}
|
|
|
|
#define MAX_LINK_STATS_INFO 2000
|
|
|
|
struct sk_buff *tipc_link_cmd_show_stats(const void *req_tlv_area, int req_tlv_space)
|
|
{
|
|
struct sk_buff *buf;
|
|
struct tlv_desc *rep_tlv;
|
|
int str_len;
|
|
|
|
if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_LINK_NAME))
|
|
return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
|
|
|
|
buf = tipc_cfg_reply_alloc(TLV_SPACE(MAX_LINK_STATS_INFO));
|
|
if (!buf)
|
|
return NULL;
|
|
|
|
rep_tlv = (struct tlv_desc *)buf->data;
|
|
|
|
str_len = tipc_link_stats((char *)TLV_DATA(req_tlv_area),
|
|
(char *)TLV_DATA(rep_tlv), MAX_LINK_STATS_INFO);
|
|
if (!str_len) {
|
|
buf_discard(buf);
|
|
return tipc_cfg_reply_error_string("link not found");
|
|
}
|
|
|
|
skb_put(buf, TLV_SPACE(str_len));
|
|
TLV_SET(rep_tlv, TIPC_TLV_ULTRA_STRING, NULL, str_len);
|
|
|
|
return buf;
|
|
}
|
|
|
|
#if 0
|
|
int link_control(const char *name, u32 op, u32 val)
|
|
{
|
|
int res = -EINVAL;
|
|
struct link *l_ptr;
|
|
u32 bearer_id;
|
|
struct node * node;
|
|
u32 a;
|
|
|
|
a = link_name2addr(name, &bearer_id);
|
|
read_lock_bh(&tipc_net_lock);
|
|
node = tipc_node_find(a);
|
|
if (node) {
|
|
tipc_node_lock(node);
|
|
l_ptr = node->links[bearer_id];
|
|
if (l_ptr) {
|
|
if (op == TIPC_REMOVE_LINK) {
|
|
struct bearer *b_ptr = l_ptr->b_ptr;
|
|
spin_lock_bh(&b_ptr->publ.lock);
|
|
tipc_link_delete(l_ptr);
|
|
spin_unlock_bh(&b_ptr->publ.lock);
|
|
}
|
|
if (op == TIPC_CMD_BLOCK_LINK) {
|
|
tipc_link_reset(l_ptr);
|
|
l_ptr->blocked = 1;
|
|
}
|
|
if (op == TIPC_CMD_UNBLOCK_LINK) {
|
|
l_ptr->blocked = 0;
|
|
}
|
|
res = TIPC_OK;
|
|
}
|
|
tipc_node_unlock(node);
|
|
}
|
|
read_unlock_bh(&tipc_net_lock);
|
|
return res;
|
|
}
|
|
#endif
|
|
|
|
/**
|
|
* tipc_link_get_max_pkt - get maximum packet size to use when sending to destination
|
|
* @dest: network address of destination node
|
|
* @selector: used to select from set of active links
|
|
*
|
|
* If no active link can be found, uses default maximum packet size.
|
|
*/
|
|
|
|
u32 tipc_link_get_max_pkt(u32 dest, u32 selector)
|
|
{
|
|
struct node *n_ptr;
|
|
struct link *l_ptr;
|
|
u32 res = MAX_PKT_DEFAULT;
|
|
|
|
if (dest == tipc_own_addr)
|
|
return MAX_MSG_SIZE;
|
|
|
|
read_lock_bh(&tipc_net_lock);
|
|
n_ptr = tipc_node_select(dest, selector);
|
|
if (n_ptr) {
|
|
tipc_node_lock(n_ptr);
|
|
l_ptr = n_ptr->active_links[selector & 1];
|
|
if (l_ptr)
|
|
res = link_max_pkt(l_ptr);
|
|
tipc_node_unlock(n_ptr);
|
|
}
|
|
read_unlock_bh(&tipc_net_lock);
|
|
return res;
|
|
}
|
|
|
|
#if 0
|
|
static void link_dump_rec_queue(struct link *l_ptr)
|
|
{
|
|
struct sk_buff *crs;
|
|
|
|
if (!l_ptr->oldest_deferred_in) {
|
|
info("Reception queue empty\n");
|
|
return;
|
|
}
|
|
info("Contents of Reception queue:\n");
|
|
crs = l_ptr->oldest_deferred_in;
|
|
while (crs) {
|
|
if (crs->data == (void *)0x0000a3a3) {
|
|
info("buffer %x invalid\n", crs);
|
|
return;
|
|
}
|
|
msg_dbg(buf_msg(crs), "In rec queue: \n");
|
|
crs = crs->next;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
static void link_dump_send_queue(struct link *l_ptr)
|
|
{
|
|
if (l_ptr->next_out) {
|
|
info("\nContents of unsent queue:\n");
|
|
dbg_print_buf_chain(l_ptr->next_out);
|
|
}
|
|
info("\nContents of send queue:\n");
|
|
if (l_ptr->first_out) {
|
|
dbg_print_buf_chain(l_ptr->first_out);
|
|
}
|
|
info("Empty send queue\n");
|
|
}
|
|
|
|
static void link_print(struct link *l_ptr, struct print_buf *buf,
|
|
const char *str)
|
|
{
|
|
tipc_printf(buf, str);
|
|
if (link_reset_reset(l_ptr) || link_reset_unknown(l_ptr))
|
|
return;
|
|
tipc_printf(buf, "Link %x<%s>:",
|
|
l_ptr->addr, l_ptr->b_ptr->publ.name);
|
|
tipc_printf(buf, ": NXO(%u):", mod(l_ptr->next_out_no));
|
|
tipc_printf(buf, "NXI(%u):", mod(l_ptr->next_in_no));
|
|
tipc_printf(buf, "SQUE");
|
|
if (l_ptr->first_out) {
|
|
tipc_printf(buf, "[%u..", msg_seqno(buf_msg(l_ptr->first_out)));
|
|
if (l_ptr->next_out)
|
|
tipc_printf(buf, "%u..",
|
|
msg_seqno(buf_msg(l_ptr->next_out)));
|
|
tipc_printf(buf, "%u]",
|
|
msg_seqno(buf_msg
|
|
(l_ptr->last_out)), l_ptr->out_queue_size);
|
|
if ((mod(msg_seqno(buf_msg(l_ptr->last_out)) -
|
|
msg_seqno(buf_msg(l_ptr->first_out)))
|
|
!= (l_ptr->out_queue_size - 1))
|
|
|| (l_ptr->last_out->next != 0)) {
|
|
tipc_printf(buf, "\nSend queue inconsistency\n");
|
|
tipc_printf(buf, "first_out= %x ", l_ptr->first_out);
|
|
tipc_printf(buf, "next_out= %x ", l_ptr->next_out);
|
|
tipc_printf(buf, "last_out= %x ", l_ptr->last_out);
|
|
link_dump_send_queue(l_ptr);
|
|
}
|
|
} else
|
|
tipc_printf(buf, "[]");
|
|
tipc_printf(buf, "SQSIZ(%u)", l_ptr->out_queue_size);
|
|
if (l_ptr->oldest_deferred_in) {
|
|
u32 o = msg_seqno(buf_msg(l_ptr->oldest_deferred_in));
|
|
u32 n = msg_seqno(buf_msg(l_ptr->newest_deferred_in));
|
|
tipc_printf(buf, ":RQUE[%u..%u]", o, n);
|
|
if (l_ptr->deferred_inqueue_sz != mod((n + 1) - o)) {
|
|
tipc_printf(buf, ":RQSIZ(%u)",
|
|
l_ptr->deferred_inqueue_sz);
|
|
}
|
|
}
|
|
if (link_working_unknown(l_ptr))
|
|
tipc_printf(buf, ":WU");
|
|
if (link_reset_reset(l_ptr))
|
|
tipc_printf(buf, ":RR");
|
|
if (link_reset_unknown(l_ptr))
|
|
tipc_printf(buf, ":RU");
|
|
if (link_working_working(l_ptr))
|
|
tipc_printf(buf, ":WW");
|
|
tipc_printf(buf, "\n");
|
|
}
|
|
|