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author | Ying Xue <ying.xue@windriver.com> | 2014-12-02 15:00:24 +0800 |
---|---|---|
committer | David S. Miller <davem@davemloft.net> | 2014-12-08 20:39:56 -0500 |
commit | 993bfe5daf34c645a51348facdc7c28c55f488fe (patch) | |
tree | 004748177d0ee50bfad2e6b12f3364f7e047adf9 /net/tipc/name_table.c | |
parent | 1b61e70ad13e1c907f143c3b0a1694df640639c0 (diff) | |
download | linux-993bfe5daf34c645a51348facdc7c28c55f488fe.tar.gz linux-993bfe5daf34c645a51348facdc7c28c55f488fe.tar.bz2 linux-993bfe5daf34c645a51348facdc7c28c55f488fe.zip |
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@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>
Diffstat (limited to 'net/tipc/name_table.c')
-rw-r--r-- | net/tipc/name_table.c | 60 |
1 files changed, 30 insertions, 30 deletions
diff --git a/net/tipc/name_table.c b/net/tipc/name_table.c index 772be1cd8bf6..df3da2924fc7 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); |