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Date: Tue, 2 Dec 2014 15:00:24 +0800
From: Ying Xue <ying.xue@...driver.com>
To: <davem@...emloft.net>
CC: <jon.maloy@...csson.com>, <Paul.Gortmaker@...driver.com>,
<erik.hugne@...csson.com>, <richard.alpe@...csson.com>,
<tero.aho@...iant.com>, <netdev@...r.kernel.org>,
<tipc-discussion@...ts.sourceforge.net>
Subject: [PATCH net-next 2/8] tipc: make name table allocated dynamically
Name table locking policy is going to be adjusted from read-write
lock protection to RCU lock protection in the future commits. But
its essential precondition is to convert the allocation way of name
table from static to dynamic mode.
Signed-off-by: Ying Xue <ying.xue@...driver.com>
Reviewed-by: Erik Hugne <erik.hugne@...csson.com>
Reviewed-by: Jon Maloy <jon.maloy@...csson.com>
Tested-by: Erik Hugne <erik.hugne@...csson.com>
---
net/tipc/name_distr.c | 44 +++++++++---------------------------
net/tipc/name_table.c | 60 ++++++++++++++++++++++++-------------------------
net/tipc/name_table.h | 16 ++++++++++++-
3 files changed, 55 insertions(+), 65 deletions(-)
diff --git a/net/tipc/name_distr.c b/net/tipc/name_distr.c
index 628cd85..ed00929 100644
--- a/net/tipc/name_distr.c
+++ b/net/tipc/name_distr.c
@@ -38,34 +38,6 @@
#include "link.h"
#include "name_distr.h"
-/**
- * struct publ_list - list of publications made by this node
- * @list: circular list of publications
- */
-struct publ_list {
- struct list_head list;
-};
-
-static struct publ_list publ_zone = {
- .list = LIST_HEAD_INIT(publ_zone.list),
-};
-
-static struct publ_list publ_cluster = {
- .list = LIST_HEAD_INIT(publ_cluster.list),
-};
-
-static struct publ_list publ_node = {
- .list = LIST_HEAD_INIT(publ_node.list),
-};
-
-static struct publ_list *publ_lists[] = {
- NULL,
- &publ_zone, /* publ_lists[TIPC_ZONE_SCOPE] */
- &publ_cluster, /* publ_lists[TIPC_CLUSTER_SCOPE] */
- &publ_node /* publ_lists[TIPC_NODE_SCOPE] */
-};
-
-
int sysctl_tipc_named_timeout __read_mostly = 2000;
/**
@@ -141,7 +113,8 @@ struct sk_buff *tipc_named_publish(struct publication *publ)
struct sk_buff *buf;
struct distr_item *item;
- list_add_tail(&publ->local_list, &publ_lists[publ->scope]->list);
+ list_add_tail(&publ->local_list,
+ &tipc_nametbl->publ_list[publ->scope]);
if (publ->scope == TIPC_NODE_SCOPE)
return NULL;
@@ -188,7 +161,7 @@ struct sk_buff *tipc_named_withdraw(struct publication *publ)
* @pls: linked list of publication items to be packed into buffer chain
*/
static void named_distribute(struct sk_buff_head *list, u32 dnode,
- struct publ_list *pls)
+ struct list_head *pls)
{
struct publication *publ;
struct sk_buff *skb = NULL;
@@ -196,7 +169,7 @@ static void named_distribute(struct sk_buff_head *list, u32 dnode,
uint msg_dsz = (tipc_node_get_mtu(dnode, 0) / ITEM_SIZE) * ITEM_SIZE;
uint msg_rem = msg_dsz;
- list_for_each_entry(publ, &pls->list, local_list) {
+ list_for_each_entry(publ, pls, local_list) {
/* Prepare next buffer: */
if (!skb) {
skb = named_prepare_buf(PUBLICATION, msg_rem, dnode);
@@ -236,8 +209,10 @@ void tipc_named_node_up(u32 dnode)
__skb_queue_head_init(&head);
read_lock_bh(&tipc_nametbl_lock);
- named_distribute(&head, dnode, &publ_cluster);
- named_distribute(&head, dnode, &publ_zone);
+ named_distribute(&head, dnode,
+ &tipc_nametbl->publ_list[TIPC_CLUSTER_SCOPE]);
+ named_distribute(&head, dnode,
+ &tipc_nametbl->publ_list[TIPC_ZONE_SCOPE]);
read_unlock_bh(&tipc_nametbl_lock);
tipc_link_xmit(&head, dnode, dnode);
@@ -427,7 +402,8 @@ void tipc_named_reinit(void)
write_lock_bh(&tipc_nametbl_lock);
for (scope = TIPC_ZONE_SCOPE; scope <= TIPC_NODE_SCOPE; scope++)
- list_for_each_entry(publ, &publ_lists[scope]->list, local_list)
+ list_for_each_entry(publ, &tipc_nametbl->publ_list[scope],
+ local_list)
publ->node = tipc_own_addr;
write_unlock_bh(&tipc_nametbl_lock);
diff --git a/net/tipc/name_table.c b/net/tipc/name_table.c
index 772be1c..df3da29 100644
--- a/net/tipc/name_table.c
+++ b/net/tipc/name_table.c
@@ -2,7 +2,7 @@
* net/tipc/name_table.c: TIPC name table code
*
* Copyright (c) 2000-2006, 2014, Ericsson AB
- * Copyright (c) 2004-2008, 2010-2011, Wind River Systems
+ * Copyright (c) 2004-2008, 2010-2014, Wind River Systems
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
@@ -103,18 +103,7 @@ struct name_seq {
spinlock_t lock;
};
-/**
- * struct name_table - table containing all existing port name publications
- * @types: pointer to fixed-sized array of name sequence lists,
- * accessed via hashing on 'type'; name sequence lists are *not* sorted
- * @local_publ_count: number of publications issued by this node
- */
-struct name_table {
- struct hlist_head *types;
- u32 local_publ_count;
-};
-
-static struct name_table table;
+struct name_table *tipc_nametbl;
DEFINE_RWLOCK(tipc_nametbl_lock);
static int hash(int x)
@@ -475,7 +464,7 @@ static struct name_seq *nametbl_find_seq(u32 type)
struct hlist_head *seq_head;
struct name_seq *ns;
- seq_head = &table.types[hash(type)];
+ seq_head = &tipc_nametbl->seq_hlist[hash(type)];
hlist_for_each_entry(ns, seq_head, ns_list) {
if (ns->type == type)
return ns;
@@ -488,6 +477,7 @@ struct publication *tipc_nametbl_insert_publ(u32 type, u32 lower, u32 upper,
u32 scope, u32 node, u32 port, u32 key)
{
struct name_seq *seq = nametbl_find_seq(type);
+ int index = hash(type);
if ((scope < TIPC_ZONE_SCOPE) || (scope > TIPC_NODE_SCOPE) ||
(lower > upper)) {
@@ -497,7 +487,8 @@ struct publication *tipc_nametbl_insert_publ(u32 type, u32 lower, u32 upper,
}
if (!seq)
- seq = tipc_nameseq_create(type, &table.types[hash(type)]);
+ seq = tipc_nameseq_create(type,
+ &tipc_nametbl->seq_hlist[index]);
if (!seq)
return NULL;
@@ -667,7 +658,7 @@ struct publication *tipc_nametbl_publish(u32 type, u32 lower, u32 upper,
struct publication *publ;
struct sk_buff *buf = NULL;
- if (table.local_publ_count >= TIPC_MAX_PUBLICATIONS) {
+ if (tipc_nametbl->local_publ_count >= TIPC_MAX_PUBLICATIONS) {
pr_warn("Publication failed, local publication limit reached (%u)\n",
TIPC_MAX_PUBLICATIONS);
return NULL;
@@ -677,7 +668,7 @@ struct publication *tipc_nametbl_publish(u32 type, u32 lower, u32 upper,
publ = tipc_nametbl_insert_publ(type, lower, upper, scope,
tipc_own_addr, port_ref, key);
if (likely(publ)) {
- table.local_publ_count++;
+ tipc_nametbl->local_publ_count++;
buf = tipc_named_publish(publ);
/* Any pending external events? */
tipc_named_process_backlog();
@@ -700,7 +691,7 @@ int tipc_nametbl_withdraw(u32 type, u32 lower, u32 ref, u32 key)
write_lock_bh(&tipc_nametbl_lock);
publ = tipc_nametbl_remove_publ(type, lower, tipc_own_addr, ref, key);
if (likely(publ)) {
- table.local_publ_count--;
+ tipc_nametbl->local_publ_count--;
buf = tipc_named_withdraw(publ);
/* Any pending external events? */
tipc_named_process_backlog();
@@ -725,12 +716,14 @@ int tipc_nametbl_withdraw(u32 type, u32 lower, u32 ref, u32 key)
void tipc_nametbl_subscribe(struct tipc_subscription *s)
{
u32 type = s->seq.type;
+ int index = hash(type);
struct name_seq *seq;
write_lock_bh(&tipc_nametbl_lock);
seq = nametbl_find_seq(type);
if (!seq)
- seq = tipc_nameseq_create(type, &table.types[hash(type)]);
+ seq = tipc_nameseq_create(type,
+ &tipc_nametbl->seq_hlist[index]);
if (seq) {
spin_lock_bh(&seq->lock);
tipc_nameseq_subscribe(seq, s);
@@ -882,7 +875,7 @@ static int nametbl_list(char *buf, int len, u32 depth_info,
lowbound = 0;
upbound = ~0;
for (i = 0; i < TIPC_NAMETBL_SIZE; i++) {
- seq_head = &table.types[i];
+ seq_head = &tipc_nametbl->seq_hlist[i];
hlist_for_each_entry(seq, seq_head, ns_list) {
ret += nameseq_list(seq, buf + ret, len - ret,
depth, seq->type,
@@ -898,7 +891,7 @@ static int nametbl_list(char *buf, int len, u32 depth_info,
}
ret += nametbl_header(buf + ret, len - ret, depth);
i = hash(type);
- seq_head = &table.types[i];
+ seq_head = &tipc_nametbl->seq_hlist[i];
hlist_for_each_entry(seq, seq_head, ns_list) {
if (seq->type == type) {
ret += nameseq_list(seq, buf + ret, len - ret,
@@ -945,12 +938,18 @@ struct sk_buff *tipc_nametbl_get(const void *req_tlv_area, int req_tlv_space)
int tipc_nametbl_init(void)
{
- table.types = kcalloc(TIPC_NAMETBL_SIZE, sizeof(struct hlist_head),
- GFP_ATOMIC);
- if (!table.types)
+ int i;
+
+ tipc_nametbl = kzalloc(sizeof(*tipc_nametbl), GFP_ATOMIC);
+ if (!tipc_nametbl)
return -ENOMEM;
- table.local_publ_count = 0;
+ for (i = 0; i < TIPC_NAMETBL_SIZE; i++)
+ INIT_HLIST_HEAD(&tipc_nametbl->seq_hlist[i]);
+
+ INIT_LIST_HEAD(&tipc_nametbl->publ_list[TIPC_ZONE_SCOPE]);
+ INIT_LIST_HEAD(&tipc_nametbl->publ_list[TIPC_CLUSTER_SCOPE]);
+ INIT_LIST_HEAD(&tipc_nametbl->publ_list[TIPC_NODE_SCOPE]);
return 0;
}
@@ -990,16 +989,17 @@ void tipc_nametbl_stop(void)
*/
write_lock_bh(&tipc_nametbl_lock);
for (i = 0; i < TIPC_NAMETBL_SIZE; i++) {
- if (hlist_empty(&table.types[i]))
+ if (hlist_empty(&tipc_nametbl->seq_hlist[i]))
continue;
- seq_head = &table.types[i];
+ seq_head = &tipc_nametbl->seq_hlist[i];
hlist_for_each_entry_safe(seq, safe, seq_head, ns_list) {
tipc_purge_publications(seq);
}
}
- kfree(table.types);
- table.types = NULL;
write_unlock_bh(&tipc_nametbl_lock);
+
+ kfree(tipc_nametbl);
+
}
static int __tipc_nl_add_nametable_publ(struct tipc_nl_msg *msg,
@@ -1113,7 +1113,7 @@ static int __tipc_nl_seq_list(struct tipc_nl_msg *msg, u32 *last_type,
i = 0;
for (; i < TIPC_NAMETBL_SIZE; i++) {
- seq_head = &table.types[i];
+ seq_head = &tipc_nametbl->seq_hlist[i];
if (*last_type) {
seq = nametbl_find_seq(*last_type);
diff --git a/net/tipc/name_table.h b/net/tipc/name_table.h
index c628778..c1fd734 100644
--- a/net/tipc/name_table.h
+++ b/net/tipc/name_table.h
@@ -43,7 +43,9 @@ struct tipc_port_list;
/*
* TIPC name types reserved for internal TIPC use (both current and planned)
*/
-#define TIPC_ZM_SRV 3 /* zone master service name type */
+#define TIPC_ZM_SRV 3 /* zone master service name type */
+#define TIPC_PUBL_SCOPE_NUM (TIPC_NODE_SCOPE + 1)
+#define TIPC_NAMETBL_SIZE 1024 /* must be a power of 2 */
/**
* struct publication - info about a published (name or) name sequence
@@ -79,8 +81,20 @@ struct publication {
struct list_head zone_list;
};
+/**
+ * struct name_table - table containing all existing port name publications
+ * @seq_hlist: name sequence hash lists
+ * @publ_list: pulication lists
+ * @local_publ_count: number of publications issued by this node
+ */
+struct name_table {
+ struct hlist_head seq_hlist[TIPC_NAMETBL_SIZE];
+ struct list_head publ_list[TIPC_PUBL_SCOPE_NUM];
+ u32 local_publ_count;
+};
extern rwlock_t tipc_nametbl_lock;
+extern struct name_table *tipc_nametbl;
int tipc_nl_name_table_dump(struct sk_buff *skb, struct netlink_callback *cb);
--
1.7.9.5
--
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