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![Ying Xue](/assets/img/avatar_default.png)
Convert tipc name table read-write lock to RCU. After this change, a new spin lock is used to protect name table on write side while RCU is applied on read side. 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> Tested-by: Erik Hugne <erik.hugne@ericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>
410 lines
11 KiB
C
410 lines
11 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, 2014, 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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int sysctl_tipc_named_timeout __read_mostly = 2000;
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/**
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* struct tipc_dist_queue - queue holding deferred name table updates
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*/
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static struct list_head tipc_dist_queue = LIST_HEAD_INIT(tipc_dist_queue);
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struct distr_queue_item {
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struct distr_item i;
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u32 dtype;
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u32 node;
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unsigned long expires;
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struct list_head next;
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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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void named_cluster_distribute(struct sk_buff *skb)
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{
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struct sk_buff *oskb;
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struct tipc_node *node;
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u32 dnode;
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rcu_read_lock();
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list_for_each_entry_rcu(node, &tipc_node_list, list) {
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dnode = node->addr;
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if (in_own_node(dnode))
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continue;
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if (!tipc_node_active_links(node))
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continue;
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oskb = skb_copy(skb, GFP_ATOMIC);
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if (!oskb)
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break;
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msg_set_destnode(buf_msg(oskb), dnode);
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tipc_link_xmit_skb(oskb, dnode, dnode);
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}
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rcu_read_unlock();
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kfree_skb(skb);
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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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struct sk_buff *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_rcu(&publ->local_list,
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&tipc_nametbl->publ_list[publ->scope]);
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if (publ->scope == TIPC_NODE_SCOPE)
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return NULL;
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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 NULL;
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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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return 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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struct sk_buff *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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if (publ->scope == TIPC_NODE_SCOPE)
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return NULL;
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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 NULL;
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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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return 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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* @list: list of messages (buffers) to be returned from this function
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* @dnode: node to be updated
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* @pls: linked list of publication items to be packed into buffer chain
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*/
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static void named_distribute(struct sk_buff_head *list, u32 dnode,
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struct list_head *pls)
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{
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struct publication *publ;
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struct sk_buff *skb = NULL;
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struct distr_item *item = NULL;
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uint msg_dsz = (tipc_node_get_mtu(dnode, 0) / ITEM_SIZE) * ITEM_SIZE;
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uint msg_rem = msg_dsz;
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list_for_each_entry(publ, pls, local_list) {
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/* Prepare next buffer: */
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if (!skb) {
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skb = named_prepare_buf(PUBLICATION, msg_rem, dnode);
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if (!skb) {
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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(skb));
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}
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/* Pack publication into message: */
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publ_to_item(item, publ);
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item++;
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msg_rem -= ITEM_SIZE;
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/* Append full buffer to list: */
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if (!msg_rem) {
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__skb_queue_tail(list, skb);
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skb = NULL;
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msg_rem = msg_dsz;
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}
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}
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if (skb) {
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msg_set_size(buf_msg(skb), INT_H_SIZE + (msg_dsz - msg_rem));
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skb_trim(skb, INT_H_SIZE + (msg_dsz - msg_rem));
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__skb_queue_tail(list, skb);
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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(u32 dnode)
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{
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struct sk_buff_head head;
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__skb_queue_head_init(&head);
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rcu_read_lock();
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named_distribute(&head, dnode,
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&tipc_nametbl->publ_list[TIPC_CLUSTER_SCOPE]);
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named_distribute(&head, dnode,
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&tipc_nametbl->publ_list[TIPC_ZONE_SCOPE]);
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rcu_read_unlock();
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tipc_link_xmit(&head, dnode, dnode);
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}
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static void tipc_publ_subscribe(struct publication *publ, u32 addr)
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{
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struct tipc_node *node;
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if (in_own_node(addr))
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return;
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node = tipc_node_find(addr);
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if (!node) {
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pr_warn("Node subscription rejected, unknown node 0x%x\n",
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addr);
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return;
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}
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tipc_node_lock(node);
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list_add_tail(&publ->nodesub_list, &node->publ_list);
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tipc_node_unlock(node);
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}
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static void tipc_publ_unsubscribe(struct publication *publ, u32 addr)
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{
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struct tipc_node *node;
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node = tipc_node_find(addr);
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if (!node)
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return;
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tipc_node_lock(node);
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list_del_init(&publ->nodesub_list);
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tipc_node_unlock(node);
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}
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/**
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* tipc_publ_purge - 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 tipc_publ_purge(struct publication *publ, u32 addr)
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{
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struct publication *p;
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spin_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_publ_unsubscribe(p, addr);
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spin_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_rcu(p, rcu);
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}
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void tipc_publ_notify(struct list_head *nsub_list, u32 addr)
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{
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struct publication *publ, *tmp;
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list_for_each_entry_safe(publ, tmp, nsub_list, nodesub_list)
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tipc_publ_purge(publ, addr);
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}
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/**
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* tipc_update_nametbl - try to process a nametable update and notify
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* subscribers
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*
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* tipc_nametbl_lock must be held.
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* Returns the publication item if successful, otherwise NULL.
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*/
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static bool tipc_update_nametbl(struct distr_item *i, u32 node, u32 dtype)
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{
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struct publication *publ = NULL;
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if (dtype == PUBLICATION) {
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publ = tipc_nametbl_insert_publ(ntohl(i->type), ntohl(i->lower),
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ntohl(i->upper),
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TIPC_CLUSTER_SCOPE, node,
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ntohl(i->ref), ntohl(i->key));
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if (publ) {
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tipc_publ_subscribe(publ, node);
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return true;
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}
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} else if (dtype == WITHDRAWAL) {
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publ = tipc_nametbl_remove_publ(ntohl(i->type), ntohl(i->lower),
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node, ntohl(i->ref),
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ntohl(i->key));
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if (publ) {
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tipc_publ_unsubscribe(publ, node);
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kfree_rcu(publ, rcu);
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return true;
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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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return false;
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}
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/**
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* tipc_named_add_backlog - add a failed name table update to the backlog
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*
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*/
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static void tipc_named_add_backlog(struct distr_item *i, u32 type, u32 node)
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{
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struct distr_queue_item *e;
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unsigned long now = get_jiffies_64();
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e = kzalloc(sizeof(*e), GFP_ATOMIC);
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if (!e)
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return;
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e->dtype = type;
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e->node = node;
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e->expires = now + msecs_to_jiffies(sysctl_tipc_named_timeout);
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memcpy(e, i, sizeof(*i));
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list_add_tail(&e->next, &tipc_dist_queue);
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}
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/**
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* tipc_named_process_backlog - try to process any pending name table updates
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* from the network.
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*/
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void tipc_named_process_backlog(void)
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{
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struct distr_queue_item *e, *tmp;
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char addr[16];
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unsigned long now = get_jiffies_64();
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list_for_each_entry_safe(e, tmp, &tipc_dist_queue, next) {
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if (time_after(e->expires, now)) {
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if (!tipc_update_nametbl(&e->i, e->node, e->dtype))
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continue;
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} else {
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tipc_addr_string_fill(addr, e->node);
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pr_warn_ratelimited("Dropping name table update (%d) of {%u, %u, %u} from %s key=%u\n",
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e->dtype, ntohl(e->i.type),
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ntohl(e->i.lower),
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ntohl(e->i.upper),
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addr, ntohl(e->i.key));
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}
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list_del(&e->next);
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kfree(e);
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}
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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 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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u32 node = msg_orignode(msg);
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spin_lock_bh(&tipc_nametbl_lock);
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while (count--) {
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if (!tipc_update_nametbl(item, node, msg_type(msg)))
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tipc_named_add_backlog(item, msg_type(msg), node);
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item++;
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}
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tipc_named_process_backlog();
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spin_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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spin_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_rcu(publ, &tipc_nametbl->publ_list[scope],
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local_list)
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publ->node = tipc_own_addr;
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spin_unlock_bh(&tipc_nametbl_lock);
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}
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