From 5fd9fd635104f4816da158cdac6917e99e192eac Mon Sep 17 00:00:00 2001 From: Jon Paul Maloy Date: Thu, 22 Oct 2015 08:51:35 -0400 Subject: [PATCH] tipc: create broadcast transmission link at namespace init The broadcast transmission link is currently instantiated when the network subsystem is started, i.e., on order from user space via netlink. This forces the broadcast transmission code to do unnecessary tests for the existence of the transmission link, as well in single mode node as in network mode. In this commit, we do instead create the link during initialization of the name space, and remove it when it is stopped. The fact that the transmission link now has a guaranteed longer life cycle than any of its potential clients paves the way for further code simplifcations and optimizations. Signed-off-by: Jon Maloy Reviewed-by: Ying Xue Signed-off-by: David S. Miller --- net/tipc/bcast.c | 15 +++++++++++++-- net/tipc/bcast.h | 1 + net/tipc/core.c | 9 +++++++++ net/tipc/net.c | 6 +----- 4 files changed, 24 insertions(+), 7 deletions(-) diff --git a/net/tipc/bcast.c b/net/tipc/bcast.c index ebf4fd7c3749..c6f0d1dbfc3c 100644 --- a/net/tipc/bcast.c +++ b/net/tipc/bcast.c @@ -106,6 +106,11 @@ struct tipc_bc_base { struct tipc_node *retransmit_to; }; +static struct tipc_bc_base *tipc_bc_base(struct net *net) +{ + return tipc_net(net)->bcbase; +} + /** * tipc_nmap_equal - test for equality of node maps */ @@ -1041,7 +1046,7 @@ int tipc_bcast_init(struct net *net) bcl->bearer_id = MAX_BEARERS; rcu_assign_pointer(tn->bearer_list[MAX_BEARERS], &bcbearer->bearer); bcl->pmsg = (struct tipc_msg *)&bcl->proto_msg; - msg_set_prevnode(bcl->pmsg, tn->own_addr); + strlcpy(bcl->name, tipc_bclink_name, TIPC_MAX_LINK_NAME); tn->bcbearer = bcbearer; tn->bcbase = bclink; @@ -1049,6 +1054,13 @@ int tipc_bcast_init(struct net *net) return 0; } +void tipc_bcast_reinit(struct net *net) +{ + struct tipc_bc_base *b = tipc_bc_base(net); + + msg_set_prevnode(b->link.pmsg, tipc_own_addr(net)); +} + void tipc_bcast_stop(struct net *net) { struct tipc_net *tn = net_generic(net, tipc_net_id); @@ -1056,7 +1068,6 @@ void tipc_bcast_stop(struct net *net) tipc_bclink_lock(net); tipc_link_purge_queues(tn->bcl); tipc_bclink_unlock(net); - RCU_INIT_POINTER(tn->bearer_list[BCBEARER], NULL); synchronize_net(); kfree(tn->bcbearer); diff --git a/net/tipc/bcast.h b/net/tipc/bcast.h index eac912abacd2..041935d4ad6d 100644 --- a/net/tipc/bcast.h +++ b/net/tipc/bcast.h @@ -47,6 +47,7 @@ struct tipc_node_map; extern const char tipc_bclink_name[]; int tipc_bcast_init(struct net *net); +void tipc_bcast_reinit(struct net *net); void tipc_bcast_stop(struct net *net); void tipc_bclink_add_node(struct net *net, u32 addr); void tipc_bclink_remove_node(struct net *net, u32 addr); diff --git a/net/tipc/core.c b/net/tipc/core.c index 005ba5eb0ea4..03a842870c52 100644 --- a/net/tipc/core.c +++ b/net/tipc/core.c @@ -42,6 +42,7 @@ #include "bearer.h" #include "net.h" #include "socket.h" +#include "bcast.h" #include @@ -71,8 +72,15 @@ static int __net_init tipc_init_net(struct net *net) err = tipc_topsrv_start(net); if (err) goto out_subscr; + + err = tipc_bcast_init(net); + if (err) + goto out_bclink; + return 0; +out_bclink: + tipc_bcast_stop(net); out_subscr: tipc_nametbl_stop(net); out_nametbl: @@ -85,6 +93,7 @@ static void __net_exit tipc_exit_net(struct net *net) { tipc_topsrv_stop(net); tipc_net_stop(net); + tipc_bcast_stop(net); tipc_nametbl_stop(net); tipc_sk_rht_destroy(net); } diff --git a/net/tipc/net.c b/net/tipc/net.c index dc623d5358aa..77bf9113c7a7 100644 --- a/net/tipc/net.c +++ b/net/tipc/net.c @@ -112,14 +112,11 @@ int tipc_net_start(struct net *net, u32 addr) { struct tipc_net *tn = net_generic(net, tipc_net_id); char addr_string[16]; - int res; tn->own_addr = addr; tipc_named_reinit(net); tipc_sk_reinit(net); - res = tipc_bcast_init(net); - if (res) - return res; + tipc_bcast_reinit(net); tipc_nametbl_publish(net, TIPC_CFG_SRV, tn->own_addr, tn->own_addr, TIPC_ZONE_SCOPE, 0, tn->own_addr); @@ -142,7 +139,6 @@ void tipc_net_stop(struct net *net) tn->own_addr); rtnl_lock(); tipc_bearer_stop(net); - tipc_bcast_stop(net); tipc_node_stop(net); rtnl_unlock(); -- 2.30.2