diff options
Diffstat (limited to 'net/tipc/bcast.c')
-rw-r--r-- | net/tipc/bcast.c | 145 |
1 files changed, 93 insertions, 52 deletions
diff --git a/net/tipc/bcast.c b/net/tipc/bcast.c index 119a59b..a0978d0 100644 --- a/net/tipc/bcast.c +++ b/net/tipc/bcast.c @@ -71,7 +71,7 @@ struct tipc_bcbearer_pair { * Note: The fields labelled "temporary" are incorporated into the bearer * to avoid consuming potentially limited stack space through the use of * large local variables within multicast routines. Concurrent access is - * prevented through use of the spinlock "bc_lock". + * prevented through use of the spinlock "bclink_lock". */ struct tipc_bcbearer { struct tipc_bearer bearer; @@ -84,28 +84,27 @@ struct tipc_bcbearer { /** * struct tipc_bclink - link used for broadcast messages + * @lock: spinlock governing access to structure * @link: (non-standard) broadcast link structure * @node: (non-standard) node structure representing b'cast link's peer node + * @flags: represent bclink states * @bcast_nodes: map of broadcast-capable nodes * @retransmit_to: node that most recently requested a retransmit * * Handles sequence numbering, fragmentation, bundling, etc. */ struct tipc_bclink { + spinlock_t lock; struct tipc_link link; struct tipc_node node; + unsigned int flags; struct tipc_node_map bcast_nodes; struct tipc_node *retransmit_to; }; -static struct tipc_bcbearer bcast_bearer; -static struct tipc_bclink bcast_link; - -static struct tipc_bcbearer *bcbearer = &bcast_bearer; -static struct tipc_bclink *bclink = &bcast_link; -static struct tipc_link *bcl = &bcast_link.link; - -static DEFINE_SPINLOCK(bc_lock); +static struct tipc_bcbearer *bcbearer; +static struct tipc_bclink *bclink; +static struct tipc_link *bcl; const char tipc_bclink_name[] = "broadcast-link"; @@ -115,6 +114,35 @@ static void tipc_nmap_diff(struct tipc_node_map *nm_a, static void tipc_nmap_add(struct tipc_node_map *nm_ptr, u32 node); static void tipc_nmap_remove(struct tipc_node_map *nm_ptr, u32 node); +static void tipc_bclink_lock(void) +{ + spin_lock_bh(&bclink->lock); +} + +static void tipc_bclink_unlock(void) +{ + struct tipc_node *node = NULL; + + if (likely(!bclink->flags)) { + spin_unlock_bh(&bclink->lock); + return; + } + + if (bclink->flags & TIPC_BCLINK_RESET) { + bclink->flags &= ~TIPC_BCLINK_RESET; + node = tipc_bclink_retransmit_to(); + } + spin_unlock_bh(&bclink->lock); + + if (node) + tipc_link_reset_all(node); +} + +void tipc_bclink_set_flags(unsigned int flags) +{ + bclink->flags |= flags; +} + static u32 bcbuf_acks(struct sk_buff *buf) { return (u32)(unsigned long)TIPC_SKB_CB(buf)->handle; @@ -132,16 +160,16 @@ static void bcbuf_decr_acks(struct sk_buff *buf) void tipc_bclink_add_node(u32 addr) { - spin_lock_bh(&bc_lock); + tipc_bclink_lock(); tipc_nmap_add(&bclink->bcast_nodes, addr); - spin_unlock_bh(&bc_lock); + tipc_bclink_unlock(); } void tipc_bclink_remove_node(u32 addr) { - spin_lock_bh(&bc_lock); + tipc_bclink_lock(); tipc_nmap_remove(&bclink->bcast_nodes, addr); - spin_unlock_bh(&bc_lock); + tipc_bclink_unlock(); } static void bclink_set_last_sent(void) @@ -167,7 +195,7 @@ static void bclink_update_last_sent(struct tipc_node *node, u32 seqno) /** * tipc_bclink_retransmit_to - get most recent node to request retransmission * - * Called with bc_lock locked + * Called with bclink_lock locked */ struct tipc_node *tipc_bclink_retransmit_to(void) { @@ -179,7 +207,7 @@ struct tipc_node *tipc_bclink_retransmit_to(void) * @after: sequence number of last packet to *not* retransmit * @to: sequence number of last packet to retransmit * - * Called with bc_lock locked + * Called with bclink_lock locked */ static void bclink_retransmit_pkt(u32 after, u32 to) { @@ -196,7 +224,7 @@ static void bclink_retransmit_pkt(u32 after, u32 to) * @n_ptr: node that sent acknowledgement info * @acked: broadcast sequence # that has been acknowledged * - * Node is locked, bc_lock unlocked. + * Node is locked, bclink_lock unlocked. */ void tipc_bclink_acknowledge(struct tipc_node *n_ptr, u32 acked) { @@ -204,8 +232,7 @@ void tipc_bclink_acknowledge(struct tipc_node *n_ptr, u32 acked) struct sk_buff *next; unsigned int released = 0; - spin_lock_bh(&bc_lock); - + tipc_bclink_lock(); /* Bail out if tx queue is empty (no clean up is required) */ crs = bcl->first_out; if (!crs) @@ -269,7 +296,7 @@ void tipc_bclink_acknowledge(struct tipc_node *n_ptr, u32 acked) if (unlikely(released && !list_empty(&bcl->waiting_ports))) tipc_link_wakeup_ports(bcl, 0); exit: - spin_unlock_bh(&bc_lock); + tipc_bclink_unlock(); } /** @@ -322,10 +349,10 @@ void tipc_bclink_update_link_state(struct tipc_node *n_ptr, u32 last_sent) ? buf_seqno(n_ptr->bclink.deferred_head) - 1 : n_ptr->bclink.last_sent); - spin_lock_bh(&bc_lock); + tipc_bclink_lock(); tipc_bearer_send(MAX_BEARERS, buf, NULL); bcl->stats.sent_nacks++; - spin_unlock_bh(&bc_lock); + tipc_bclink_unlock(); kfree_skb(buf); n_ptr->bclink.oos_state++; @@ -362,7 +389,7 @@ int tipc_bclink_xmit(struct sk_buff *buf) { int res; - spin_lock_bh(&bc_lock); + tipc_bclink_lock(); if (!bclink->bcast_nodes.count) { res = msg_data_sz(buf_msg(buf)); @@ -377,14 +404,14 @@ int tipc_bclink_xmit(struct sk_buff *buf) bcl->stats.accu_queue_sz += bcl->out_queue_size; } exit: - spin_unlock_bh(&bc_lock); + tipc_bclink_unlock(); return res; } /** * bclink_accept_pkt - accept an incoming, in-sequence broadcast packet * - * Called with both sending node's lock and bc_lock taken. + * Called with both sending node's lock and bclink_lock taken. */ static void bclink_accept_pkt(struct tipc_node *node, u32 seqno) { @@ -439,12 +466,12 @@ void tipc_bclink_rcv(struct sk_buff *buf) if (msg_destnode(msg) == tipc_own_addr) { tipc_bclink_acknowledge(node, msg_bcast_ack(msg)); tipc_node_unlock(node); - spin_lock_bh(&bc_lock); + tipc_bclink_lock(); bcl->stats.recv_nacks++; bclink->retransmit_to = node; bclink_retransmit_pkt(msg_bcgap_after(msg), msg_bcgap_to(msg)); - spin_unlock_bh(&bc_lock); + tipc_bclink_unlock(); } else { tipc_node_unlock(node); bclink_peek_nack(msg); @@ -462,20 +489,20 @@ receive: /* Deliver message to destination */ if (likely(msg_isdata(msg))) { - spin_lock_bh(&bc_lock); + tipc_bclink_lock(); bclink_accept_pkt(node, seqno); - spin_unlock_bh(&bc_lock); + tipc_bclink_unlock(); tipc_node_unlock(node); if (likely(msg_mcast(msg))) tipc_port_mcast_rcv(buf, NULL); else kfree_skb(buf); } else if (msg_user(msg) == MSG_BUNDLER) { - spin_lock_bh(&bc_lock); + tipc_bclink_lock(); bclink_accept_pkt(node, seqno); bcl->stats.recv_bundles++; bcl->stats.recv_bundled += msg_msgcnt(msg); - spin_unlock_bh(&bc_lock); + tipc_bclink_unlock(); tipc_node_unlock(node); tipc_link_bundle_rcv(buf); } else if (msg_user(msg) == MSG_FRAGMENTER) { @@ -485,28 +512,28 @@ receive: &buf); if (ret == LINK_REASM_ERROR) goto unlock; - spin_lock_bh(&bc_lock); + tipc_bclink_lock(); bclink_accept_pkt(node, seqno); bcl->stats.recv_fragments++; if (ret == LINK_REASM_COMPLETE) { bcl->stats.recv_fragmented++; /* Point msg to inner header */ msg = buf_msg(buf); - spin_unlock_bh(&bc_lock); + tipc_bclink_unlock(); goto receive; } - spin_unlock_bh(&bc_lock); + tipc_bclink_unlock(); tipc_node_unlock(node); } else if (msg_user(msg) == NAME_DISTRIBUTOR) { - spin_lock_bh(&bc_lock); + tipc_bclink_lock(); bclink_accept_pkt(node, seqno); - spin_unlock_bh(&bc_lock); + tipc_bclink_unlock(); tipc_node_unlock(node); tipc_named_rcv(buf); } else { - spin_lock_bh(&bc_lock); + tipc_bclink_lock(); bclink_accept_pkt(node, seqno); - spin_unlock_bh(&bc_lock); + tipc_bclink_unlock(); tipc_node_unlock(node); kfree_skb(buf); } @@ -552,14 +579,14 @@ receive: } else deferred = 0; - spin_lock_bh(&bc_lock); + tipc_bclink_lock(); if (deferred) bcl->stats.deferred_recv++; else bcl->stats.duplicates++; - spin_unlock_bh(&bc_lock); + tipc_bclink_unlock(); unlock: tipc_node_unlock(node); @@ -663,7 +690,7 @@ void tipc_bcbearer_sort(struct tipc_node_map *nm_ptr, u32 node, bool action) int b_index; int pri; - spin_lock_bh(&bc_lock); + tipc_bclink_lock(); if (action) tipc_nmap_add(nm_ptr, node); @@ -710,7 +737,7 @@ void tipc_bcbearer_sort(struct tipc_node_map *nm_ptr, u32 node, bool action) bp_curr++; } - spin_unlock_bh(&bc_lock); + tipc_bclink_unlock(); } @@ -722,7 +749,7 @@ int tipc_bclink_stats(char *buf, const u32 buf_size) if (!bcl) return 0; - spin_lock_bh(&bc_lock); + tipc_bclink_lock(); s = &bcl->stats; @@ -751,7 +778,7 @@ int tipc_bclink_stats(char *buf, const u32 buf_size) s->queue_sz_counts ? (s->accu_queue_sz / s->queue_sz_counts) : 0); - spin_unlock_bh(&bc_lock); + tipc_bclink_unlock(); return ret; } @@ -760,9 +787,9 @@ int tipc_bclink_reset_stats(void) if (!bcl) return -ENOPROTOOPT; - spin_lock_bh(&bc_lock); + tipc_bclink_lock(); memset(&bcl->stats, 0, sizeof(bcl->stats)); - spin_unlock_bh(&bc_lock); + tipc_bclink_unlock(); return 0; } @@ -773,18 +800,30 @@ int tipc_bclink_set_queue_limits(u32 limit) if ((limit < TIPC_MIN_LINK_WIN) || (limit > TIPC_MAX_LINK_WIN)) return -EINVAL; - spin_lock_bh(&bc_lock); + tipc_bclink_lock(); tipc_link_set_queue_limits(bcl, limit); - spin_unlock_bh(&bc_lock); + tipc_bclink_unlock(); return 0; } -void tipc_bclink_init(void) +int tipc_bclink_init(void) { + bcbearer = kzalloc(sizeof(*bcbearer), GFP_ATOMIC); + if (!bcbearer) + return -ENOMEM; + + bclink = kzalloc(sizeof(*bclink), GFP_ATOMIC); + if (!bclink) { + kfree(bcbearer); + return -ENOMEM; + } + + bcl = &bclink->link; bcbearer->bearer.media = &bcbearer->media; bcbearer->media.send_msg = tipc_bcbearer_send; sprintf(bcbearer->media.name, "tipc-broadcast"); + spin_lock_init(&bclink->lock); INIT_LIST_HEAD(&bcl->waiting_ports); bcl->next_out_no = 1; spin_lock_init(&bclink->node.lock); @@ -795,17 +834,19 @@ void tipc_bclink_init(void) rcu_assign_pointer(bearer_list[MAX_BEARERS], &bcbearer->bearer); bcl->state = WORKING_WORKING; strlcpy(bcl->name, tipc_bclink_name, TIPC_MAX_LINK_NAME); + return 0; } void tipc_bclink_stop(void) { - spin_lock_bh(&bc_lock); + tipc_bclink_lock(); tipc_link_purge_queues(bcl); - spin_unlock_bh(&bc_lock); + tipc_bclink_unlock(); RCU_INIT_POINTER(bearer_list[BCBEARER], NULL); - memset(bclink, 0, sizeof(*bclink)); - memset(bcbearer, 0, sizeof(*bcbearer)); + synchronize_net(); + kfree(bcbearer); + kfree(bclink); } /** |