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![Ying Xue](/assets/img/avatar_default.png)
Convert tipc_node_list list and node_htable hash list to RCU lists. On read side, the two lists are protected with RCU read lock, and on update side, node_list_lock is applied to them. Signed-off-by: Ying Xue <ying.xue@windriver.com> Reviewed-by: Erik Hugne <erik.hugne@ericsson.com> Reviewed-by: Jon Maloy <jon.maloy@ericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>
375 lines
10 KiB
C
375 lines
10 KiB
C
/*
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* net/tipc/name_distr.c: TIPC name distribution code
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*
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* Copyright (c) 2000-2006, Ericsson AB
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* Copyright (c) 2005, 2010-2011, Wind River Systems
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the names of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "core.h"
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#include "link.h"
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#include "name_distr.h"
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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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__be32 type;
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__be32 lower;
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__be32 upper;
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__be32 ref;
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__be32 key;
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};
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/**
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* struct publ_list - list of publications made by this node
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* @list: circular list of publications
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* @list_size: number of entries in list
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*/
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struct publ_list {
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struct list_head list;
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u32 size;
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};
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static struct publ_list publ_zone = {
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.list = LIST_HEAD_INIT(publ_zone.list),
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.size = 0,
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};
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static struct publ_list publ_cluster = {
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.list = LIST_HEAD_INIT(publ_cluster.list),
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.size = 0,
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};
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static struct publ_list publ_node = {
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.list = LIST_HEAD_INIT(publ_node.list),
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.size = 0,
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};
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static struct publ_list *publ_lists[] = {
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NULL,
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&publ_zone, /* publ_lists[TIPC_ZONE_SCOPE] */
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&publ_cluster, /* publ_lists[TIPC_CLUSTER_SCOPE] */
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&publ_node /* publ_lists[TIPC_NODE_SCOPE] */
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};
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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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}
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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 = tipc_buf_acquire(INT_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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tipc_msg_init(msg, NAME_DISTRIBUTOR, type, INT_H_SIZE, dest);
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msg_set_size(msg, INT_H_SIZE + size);
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}
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return buf;
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}
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static void named_cluster_distribute(struct sk_buff *buf)
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{
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struct sk_buff *buf_copy;
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struct tipc_node *n_ptr;
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struct tipc_link *l_ptr;
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rcu_read_lock();
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list_for_each_entry_rcu(n_ptr, &tipc_node_list, list) {
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spin_lock_bh(&n_ptr->lock);
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l_ptr = n_ptr->active_links[n_ptr->addr & 1];
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if (l_ptr) {
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buf_copy = skb_copy(buf, GFP_ATOMIC);
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if (!buf_copy) {
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spin_unlock_bh(&n_ptr->lock);
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break;
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}
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msg_set_destnode(buf_msg(buf_copy), n_ptr->addr);
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__tipc_link_xmit(l_ptr, buf_copy);
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}
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spin_unlock_bh(&n_ptr->lock);
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}
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rcu_read_unlock();
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kfree_skb(buf);
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}
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/**
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* tipc_named_publish - tell other nodes about a new publication by this node
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*/
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void tipc_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_tail(&publ->local_list, &publ_lists[publ->scope]->list);
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publ_lists[publ->scope]->size++;
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if (publ->scope == TIPC_NODE_SCOPE)
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return;
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buf = named_prepare_buf(PUBLICATION, ITEM_SIZE, 0);
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if (!buf) {
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pr_warn("Publication distribution failure\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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named_cluster_distribute(buf);
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}
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/**
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* tipc_named_withdraw - tell other nodes about a withdrawn publication by this node
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*/
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void tipc_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_lists[publ->scope]->size--;
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if (publ->scope == TIPC_NODE_SCOPE)
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return;
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buf = named_prepare_buf(WITHDRAWAL, ITEM_SIZE, 0);
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if (!buf) {
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pr_warn("Withdrawal distribution failure\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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named_cluster_distribute(buf);
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}
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/*
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* named_distribute - prepare name info for bulk distribution to another node
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*/
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static void named_distribute(struct list_head *message_list, u32 node,
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struct publ_list *pls, u32 max_item_buf)
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{
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struct publication *publ;
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struct sk_buff *buf = NULL;
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struct distr_item *item = NULL;
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u32 left = 0;
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u32 rest = pls->size * ITEM_SIZE;
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list_for_each_entry(publ, &pls->list, 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) {
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pr_warn("Bulk publication failure\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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}
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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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list_add_tail((struct list_head *)buf, message_list);
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buf = NULL;
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}
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}
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}
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/**
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* tipc_named_node_up - tell specified node about all publications by this node
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*/
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void tipc_named_node_up(unsigned long nodearg)
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{
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struct tipc_node *n_ptr;
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struct tipc_link *l_ptr;
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struct list_head message_list;
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u32 node = (u32)nodearg;
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u32 max_item_buf = 0;
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/* compute maximum amount of publication data to send per message */
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read_lock_bh(&tipc_net_lock);
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n_ptr = tipc_node_find(node);
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if (n_ptr) {
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tipc_node_lock(n_ptr);
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l_ptr = n_ptr->active_links[0];
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if (l_ptr)
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max_item_buf = ((l_ptr->max_pkt - INT_H_SIZE) /
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ITEM_SIZE) * ITEM_SIZE;
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tipc_node_unlock(n_ptr);
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}
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read_unlock_bh(&tipc_net_lock);
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if (!max_item_buf)
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return;
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/* create list of publication messages, then send them as a unit */
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INIT_LIST_HEAD(&message_list);
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read_lock_bh(&tipc_nametbl_lock);
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named_distribute(&message_list, node, &publ_cluster, max_item_buf);
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named_distribute(&message_list, node, &publ_zone, max_item_buf);
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read_unlock_bh(&tipc_nametbl_lock);
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tipc_link_names_xmit(&message_list, node);
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}
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/**
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* named_purge_publ - 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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*/
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static void named_purge_publ(struct publication *publ)
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{
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struct publication *p;
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write_lock_bh(&tipc_nametbl_lock);
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p = tipc_nametbl_remove_publ(publ->type, publ->lower,
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publ->node, publ->ref, publ->key);
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if (p)
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tipc_nodesub_unsubscribe(&p->subscr);
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write_unlock_bh(&tipc_nametbl_lock);
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if (p != publ) {
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pr_err("Unable to remove publication from failed node\n"
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" (type=%u, lower=%u, node=0x%x, ref=%u, key=%u)\n",
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publ->type, publ->lower, publ->node, publ->ref,
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publ->key);
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}
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kfree(p);
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}
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/**
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* tipc_named_rcv - process name table update message sent by another node
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*/
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void tipc_named_rcv(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(&tipc_nametbl_lock);
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while (count--) {
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if (msg_type(msg) == PUBLICATION) {
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publ = tipc_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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tipc_nodesub_subscribe(&publ->subscr,
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msg_orignode(msg),
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publ,
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(net_ev_handler)
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named_purge_publ);
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}
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} else if (msg_type(msg) == WITHDRAWAL) {
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publ = tipc_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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tipc_nodesub_unsubscribe(&publ->subscr);
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kfree(publ);
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} else {
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pr_err("Unable to remove publication by node 0x%x\n"
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" (type=%u, lower=%u, ref=%u, key=%u)\n",
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msg_orignode(msg), ntohl(item->type),
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ntohl(item->lower), ntohl(item->ref),
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ntohl(item->key));
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}
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} else {
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pr_warn("Unrecognized name table message received\n");
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}
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item++;
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}
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write_unlock_bh(&tipc_nametbl_lock);
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kfree_skb(buf);
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}
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/**
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* tipc_named_reinit - re-initialize local publications
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*
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* This routine is called whenever TIPC networking is enabled.
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* All name table entries published by this node are updated to reflect
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* the node's new network address.
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*/
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void tipc_named_reinit(void)
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{
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struct publication *publ;
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int scope;
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write_lock_bh(&tipc_nametbl_lock);
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for (scope = TIPC_ZONE_SCOPE; scope <= TIPC_NODE_SCOPE; scope++)
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list_for_each_entry(publ, &publ_lists[scope]->list, local_list)
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publ->node = tipc_own_addr;
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write_unlock_bh(&tipc_nametbl_lock);
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}
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