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tipc: avoid to asynchronously deliver name tables to peer node 

Postpone the actions of delivering name tables until after node
lock is released, avoiding to do it under asynchronous context.

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>
This commit is contained in:
Ying Xue 2014-05-05 08:56:14 +08:00 committed by David S. Miller
parent 9d56194968
commit ca0c42732c
4 changed files with 52 additions and 54 deletions
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52
net/tipc/name_distr.c
View File

@ -38,34 +38,6 @@
#include "link.h"
#include "name_distr.h"
#define ITEM_SIZE sizeof(struct distr_item)
/**
* struct distr_item - publication info distributed to other nodes
* @type: name sequence type
* @lower: name sequence lower bound
* @upper: name sequence upper bound
* @ref: publishing port reference
* @key: publication key
*
* ===> All fields are stored in network byte order. <===
*
* First 3 fields identify (name or) name sequence being published.
* Reference field uniquely identifies port that published name sequence.
* Key field uniquely identifies publication, in the event a port has
* multiple publications of the same name sequence.
*
* Note: There is no field that identifies the publishing node because it is
* the same for all items contained within a publication message.
*/
struct distr_item {
__be32 type;
__be32 lower;
__be32 upper;
__be32 ref;
__be32 key;
};
/**
* struct publ_list - list of publications made by this node
* @list: circular list of publications
@ -239,29 +211,9 @@ static void named_distribute(struct list_head *message_list, u32 node,
/**
* tipc_named_node_up - tell specified node about all publications by this node
*/
void tipc_named_node_up(unsigned long nodearg)
void tipc_named_node_up(u32 max_item_buf, u32 node)
{
struct tipc_node *n_ptr;
struct tipc_link *l_ptr;
struct list_head message_list;
u32 node = (u32)nodearg;
u32 max_item_buf = 0;
/* compute maximum amount of publication data to send per message */
n_ptr = tipc_node_find(node);
if (n_ptr) {
tipc_node_lock(n_ptr);
l_ptr = n_ptr->active_links[0];
if (l_ptr)
max_item_buf = ((l_ptr->max_pkt - INT_H_SIZE) /
ITEM_SIZE) * ITEM_SIZE;
tipc_node_unlock(n_ptr);
}
if (!max_item_buf)
return;
/* create list of publication messages, then send them as a unit */
INIT_LIST_HEAD(&message_list);
LIST_HEAD(message_list);
read_lock_bh(&tipc_nametbl_lock);
named_distribute(&message_list, node, &publ_cluster, max_item_buf);

30
net/tipc/name_distr.h
View File

@ -39,10 +39,38 @@
#include "name_table.h"
#define ITEM_SIZE sizeof(struct distr_item)
/**
* struct distr_item - publication info distributed to other nodes
* @type: name sequence type
* @lower: name sequence lower bound
* @upper: name sequence upper bound
* @ref: publishing port reference
* @key: publication key
*
* ===> All fields are stored in network byte order. <===
*
* First 3 fields identify (name or) name sequence being published.
* Reference field uniquely identifies port that published name sequence.
* Key field uniquely identifies publication, in the event a port has
* multiple publications of the same name sequence.
*
* Note: There is no field that identifies the publishing node because it is
* the same for all items contained within a publication message.
*/
struct distr_item {
__be32 type;
__be32 lower;
__be32 upper;
__be32 ref;
__be32 key;
};
struct sk_buff *tipc_named_publish(struct publication *publ);
struct sk_buff *tipc_named_withdraw(struct publication *publ);
void named_cluster_distribute(struct sk_buff *buf);
void tipc_named_node_up(unsigned long node);
void tipc_named_node_up(u32 max_item_buf, u32 node);
void tipc_named_rcv(struct sk_buff *buf);
void tipc_named_reinit(void);

16
net/tipc/node.c
View File

@ -267,7 +267,7 @@ void tipc_node_detach_link(struct tipc_node *n_ptr, struct tipc_link *l_ptr)
static void node_established_contact(struct tipc_node *n_ptr)
{
tipc_k_signal((Handler)tipc_named_node_up, n_ptr->addr);
n_ptr->flags |= TIPC_NODE_UP;
n_ptr->bclink.oos_state = 0;
n_ptr->bclink.acked = tipc_bclink_get_last_sent();
tipc_bclink_add_node(n_ptr->addr);
@ -455,6 +455,9 @@ int tipc_node_get_linkname(u32 bearer_id, u32 addr, char *linkname, size_t len)
void tipc_node_unlock(struct tipc_node *node)
{
LIST_HEAD(nsub_list);
struct tipc_link *link;
int pkt_sz = 0;
u32 addr = 0;
if (likely(!node->flags)) {
spin_unlock_bh(&node->lock);
@ -465,8 +468,19 @@ void tipc_node_unlock(struct tipc_node *node)
list_replace_init(&node->nsub, &nsub_list);
node->flags &= ~TIPC_NODE_LOST;
}
if (node->flags & TIPC_NODE_UP) {
link = node->active_links[0];
node->flags &= ~TIPC_NODE_UP;
if (link) {
pkt_sz = ((link->max_pkt - INT_H_SIZE) / ITEM_SIZE) *
ITEM_SIZE;
addr = node->addr;
}
}
spin_unlock_bh(&node->lock);
if (!list_empty(&nsub_list))
tipc_nodesub_notify(&nsub_list);
if (pkt_sz)
tipc_named_node_up(pkt_sz, addr);
}

8
net/tipc/node.h
View File

@ -48,15 +48,19 @@
#define INVALID_NODE_SIG 0x10000
/* Flags used to block (re)establishment of contact with a neighboring node
* TIPC_NODE_DOWN: indicate node is down
* TIPC_NODE_DOWN: indicate node is down and it's used to block the node's
* links until RESET or ACTIVE message arrives
* TIPC_NODE_RESET: indicate node is reset
* TIPC_NODE_LOST: indicate node is lost and it's used to notify subscriptions
* when node lock is released
* TIPC_NODE_UP: indicate node is up and it's used to deliver local name table
* when node lock is released
*/
enum {
TIPC_NODE_DOWN = (1 << 1),
TIPC_NODE_RESET = (1 << 2),
TIPC_NODE_LOST = (1 << 3)
TIPC_NODE_LOST = (1 << 3),
TIPC_NODE_UP = (1 << 4)
};
/**