[TIPC] Initial merge
TIPC (Transparent Inter Process Communication) is a protocol designed for intra cluster communication. For more information see http://tipc.sourceforge.net Signed-off-by: Per Liden <per.liden@nospam.ericsson.com>
This commit is contained in:
Per Liden
committed by
David S. Miller
David S. Miller
parent
58cba4650a
commit
b97bf3fd8f
306
net/tipc/name_distr.c
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306
net/tipc/name_distr.c
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/*
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* net/tipc/name_distr.c: TIPC name distribution code
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*
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* Copyright (c) 2003-2005, Ericsson Research Canada
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* Copyright (c) 2005, Wind River Systems
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* Copyright (c) 2005-2006, Ericsson AB
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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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* Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 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 this
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* software without specific prior written permission.
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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 "cluster.h"
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#include "dbg.h"
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#include "link.h"
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#include "msg.h"
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#include "name_distr.h"
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#undef DBG_OUTPUT
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#define DBG_OUTPUT NULL
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#define ITEM_SIZE sizeof(struct distr_item)
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/**
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* struct distr_item - publication info distributed to other nodes
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* @type: name sequence type
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* @lower: name sequence lower bound
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* @upper: name sequence upper bound
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* @ref: publishing port reference
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* @key: publication key
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*
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* ===> All fields are stored in network byte order. <===
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*
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* First 3 fields identify (name or) name sequence being published.
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* Reference field uniquely identifies port that published name sequence.
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* Key field uniquely identifies publication, in the event a port has
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* multiple publications of the same name sequence.
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*
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* Note: There is no field that identifies the publishing node because it is
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* the same for all items contained within a publication message.
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*/
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struct distr_item {
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u32 type;
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u32 lower;
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u32 upper;
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u32 ref;
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u32 key;
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};
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/**
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* List of externally visible publications by this node --
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* that is, all publications having scope > TIPC_NODE_SCOPE.
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*/
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static LIST_HEAD(publ_root);
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static u32 publ_cnt = 0;
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/**
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* publ_to_item - add publication info to a publication message
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*/
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static void publ_to_item(struct distr_item *i, struct publication *p)
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{
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i->type = htonl(p->type);
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i->lower = htonl(p->lower);
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i->upper = htonl(p->upper);
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i->ref = htonl(p->ref);
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i->key = htonl(p->key);
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dbg("publ_to_item: %u, %u, %u\n", p->type, p->lower, p->upper);
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}
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/**
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* named_prepare_buf - allocate & initialize a publication message
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*/
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static struct sk_buff *named_prepare_buf(u32 type, u32 size, u32 dest)
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{
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struct sk_buff *buf = buf_acquire(LONG_H_SIZE + size);
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struct tipc_msg *msg;
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if (buf != NULL) {
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msg = buf_msg(buf);
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msg_init(msg, NAME_DISTRIBUTOR, type, TIPC_OK,
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LONG_H_SIZE, dest);
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msg_set_size(msg, LONG_H_SIZE + size);
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}
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return buf;
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}
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/**
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* named_publish - tell other nodes about a new publication by this node
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*/
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void named_publish(struct publication *publ)
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{
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struct sk_buff *buf;
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struct distr_item *item;
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list_add(&publ->local_list, &publ_root);
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publ_cnt++;
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buf = named_prepare_buf(PUBLICATION, ITEM_SIZE, 0);
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if (!buf) {
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warn("Memory squeeze; failed to distribute publication\n");
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return;
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}
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item = (struct distr_item *)msg_data(buf_msg(buf));
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publ_to_item(item, publ);
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dbg("named_withdraw: broadcasting publish msg\n");
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cluster_broadcast(buf);
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}
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/**
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* named_withdraw - tell other nodes about a withdrawn publication by this node
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*/
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void named_withdraw(struct publication *publ)
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{
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struct sk_buff *buf;
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struct distr_item *item;
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list_del(&publ->local_list);
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publ_cnt--;
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buf = named_prepare_buf(WITHDRAWAL, ITEM_SIZE, 0);
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if (!buf) {
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warn("Memory squeeze; failed to distribute withdrawal\n");
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return;
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}
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item = (struct distr_item *)msg_data(buf_msg(buf));
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publ_to_item(item, publ);
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dbg("named_withdraw: broadcasting withdraw msg\n");
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cluster_broadcast(buf);
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}
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/**
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* named_node_up - tell specified node about all publications by this node
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*/
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void named_node_up(unsigned long node)
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{
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struct publication *publ;
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struct distr_item *item = 0;
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struct sk_buff *buf = 0;
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u32 left = 0;
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u32 rest;
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u32 max_item_buf;
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assert(in_own_cluster(node));
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read_lock_bh(&nametbl_lock);
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max_item_buf = TIPC_MAX_USER_MSG_SIZE / ITEM_SIZE;
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max_item_buf *= ITEM_SIZE;
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rest = publ_cnt * ITEM_SIZE;
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list_for_each_entry(publ, &publ_root, local_list) {
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if (!buf) {
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left = (rest <= max_item_buf) ? rest : max_item_buf;
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rest -= left;
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buf = named_prepare_buf(PUBLICATION, left, node);
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if (buf == NULL) {
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warn("Memory Squeeze; could not send publication\n");
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goto exit;
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}
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item = (struct distr_item *)msg_data(buf_msg(buf));
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}
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publ_to_item(item, publ);
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item++;
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left -= ITEM_SIZE;
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if (!left) {
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msg_set_link_selector(buf_msg(buf), node);
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dbg("named_node_up: sending publish msg to "
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"<%u.%u.%u>\n", tipc_zone(node),
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tipc_cluster(node), tipc_node(node));
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link_send(buf, node, node);
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buf = 0;
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}
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}
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exit:
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read_unlock_bh(&nametbl_lock);
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}
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/**
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* node_is_down - remove publication associated with a failed node
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*
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* Invoked for each publication issued by a newly failed node.
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* Removes publication structure from name table & deletes it.
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* In rare cases the link may have come back up again when this
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* function is called, and we have two items representing the same
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* publication. Nudge this item's key to distinguish it from the other.
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* (Note: Publication's node subscription is already unsubscribed.)
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*/
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static void node_is_down(struct publication *publ)
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{
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struct publication *p;
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write_lock_bh(&nametbl_lock);
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dbg("node_is_down: withdrawing %u, %u, %u\n",
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publ->type, publ->lower, publ->upper);
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publ->key += 1222345;
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p = nametbl_remove_publ(publ->type, publ->lower,
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publ->node, publ->ref, publ->key);
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assert(p == publ);
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write_unlock_bh(&nametbl_lock);
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if (publ)
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kfree(publ);
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}
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/**
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* named_recv - process name table update message sent by another node
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*/
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void named_recv(struct sk_buff *buf)
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{
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struct publication *publ;
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struct tipc_msg *msg = buf_msg(buf);
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struct distr_item *item = (struct distr_item *)msg_data(msg);
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u32 count = msg_data_sz(msg) / ITEM_SIZE;
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write_lock_bh(&nametbl_lock);
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while (count--) {
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if (msg_type(msg) == PUBLICATION) {
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dbg("named_recv: got publication for %u, %u, %u\n",
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ntohl(item->type), ntohl(item->lower),
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ntohl(item->upper));
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publ = nametbl_insert_publ(ntohl(item->type),
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ntohl(item->lower),
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ntohl(item->upper),
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TIPC_CLUSTER_SCOPE,
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msg_orignode(msg),
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ntohl(item->ref),
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ntohl(item->key));
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if (publ) {
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nodesub_subscribe(&publ->subscr,
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msg_orignode(msg),
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publ,
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(net_ev_handler)node_is_down);
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}
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} else if (msg_type(msg) == WITHDRAWAL) {
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dbg("named_recv: got withdrawl for %u, %u, %u\n",
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ntohl(item->type), ntohl(item->lower),
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ntohl(item->upper));
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publ = nametbl_remove_publ(ntohl(item->type),
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ntohl(item->lower),
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msg_orignode(msg),
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ntohl(item->ref),
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ntohl(item->key));
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if (publ) {
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nodesub_unsubscribe(&publ->subscr);
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kfree(publ);
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}
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} else {
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warn("named_recv: unknown msg\n");
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}
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item++;
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}
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write_unlock_bh(&nametbl_lock);
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buf_discard(buf);
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}
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/**
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* named_reinit - re-initialize local publication list
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*
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* This routine is called whenever TIPC networking is (re)enabled.
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* All existing publications by this node that have "cluster" or "zone" scope
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* are updated to reflect the node's current network address.
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* (If the node's address is unchanged, the update loop terminates immediately.)
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*/
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void named_reinit(void)
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{
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struct publication *publ;
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write_lock_bh(&nametbl_lock);
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list_for_each_entry(publ, &publ_root, local_list) {
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if (publ->node == tipc_own_addr)
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break;
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publ->node = tipc_own_addr;
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}
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write_unlock_bh(&nametbl_lock);
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}
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