From: Jon Paul Maloy Date: Thu, 30 Jul 2015 22:24:24 +0000 (-0400) Subject: tipc: remove implicit message delivery in node_unlock() X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=23d8335d786472021b5c733f228c7074208dcfa0;p=linux-beck.git tipc: remove implicit message delivery in node_unlock() After the most recent changes, all access calls to a link which may entail addition of messages to the link's input queue are postpended by an explicit call to tipc_sk_rcv(), using a reference to the correct queue. This means that the potentially hazardous implicit delivery, using tipc_node_unlock() in combination with a binary flag and a cached queue pointer, now has become redundant. This commit removes this implicit delivery mechanism both for regular data messages and for binding table update messages. Tested-by: Ying Xue Signed-off-by: Jon Maloy Signed-off-by: David S. Miller --- diff --git a/net/tipc/link.c b/net/tipc/link.c index 3a92924711a1..2aa19de715f6 100644 --- a/net/tipc/link.c +++ b/net/tipc/link.c @@ -559,8 +559,6 @@ void link_prepare_wakeup(struct tipc_link *l) break; skb_unlink(skb, &l->wakeupq); skb_queue_tail(l->inputq, skb); - l->owner->inputq = l->inputq; - l->owner->action_flags |= TIPC_MSG_EVT; } } @@ -598,8 +596,6 @@ void tipc_link_purge_queues(struct tipc_link *l_ptr) void tipc_link_reset(struct tipc_link *l) { - struct tipc_node *owner = l->owner; - tipc_link_fsm_evt(l, LINK_RESET_EVT); /* Link is down, accept any session */ @@ -611,14 +607,10 @@ void tipc_link_reset(struct tipc_link *l) /* Prepare for renewed mtu size negotiation */ l->mtu = l->advertised_mtu; - /* Clean up all queues, except inputq: */ + /* Clean up all queues: */ __skb_queue_purge(&l->transmq); __skb_queue_purge(&l->deferdq); - if (!owner->inputq) - owner->inputq = l->inputq; - skb_queue_splice_init(&l->wakeupq, owner->inputq); - if (!skb_queue_empty(owner->inputq)) - owner->action_flags |= TIPC_MSG_EVT; + skb_queue_splice_init(&l->wakeupq, l->inputq); tipc_link_purge_backlog(l); kfree_skb(l->reasm_buf); @@ -972,7 +964,6 @@ static bool tipc_data_input(struct tipc_link *link, struct sk_buff *skb) { struct tipc_node *node = link->owner; struct tipc_msg *msg = buf_msg(skb); - u32 dport = msg_destport(msg); switch (msg_user(msg)) { case TIPC_LOW_IMPORTANCE: @@ -980,17 +971,11 @@ static bool tipc_data_input(struct tipc_link *link, struct sk_buff *skb) case TIPC_HIGH_IMPORTANCE: case TIPC_CRITICAL_IMPORTANCE: case CONN_MANAGER: - if (tipc_skb_queue_tail(link->inputq, skb, dport)) { - node->inputq = link->inputq; - node->action_flags |= TIPC_MSG_EVT; - } + skb_queue_tail(link->inputq, skb); return true; case NAME_DISTRIBUTOR: node->bclink.recv_permitted = true; - node->namedq = link->namedq; skb_queue_tail(link->namedq, skb); - if (skb_queue_len(link->namedq) == 1) - node->action_flags |= TIPC_NAMED_MSG_EVT; return true; case MSG_BUNDLER: case TUNNEL_PROTOCOL: diff --git a/net/tipc/msg.h b/net/tipc/msg.h index 53d98ef78650..a82c5848d4bc 100644 --- a/net/tipc/msg.h +++ b/net/tipc/msg.h @@ -862,28 +862,6 @@ static inline struct sk_buff *tipc_skb_dequeue(struct sk_buff_head *list, return skb; } -/* tipc_skb_queue_tail(): add buffer to tail of list; - * @list: list to be appended to - * @skb: buffer to append. Always appended - * @dport: the destination port of the buffer - * returns true if dport differs from previous destination - */ -static inline bool tipc_skb_queue_tail(struct sk_buff_head *list, - struct sk_buff *skb, u32 dport) -{ - struct sk_buff *_skb = NULL; - bool rv = false; - - spin_lock_bh(&list->lock); - _skb = skb_peek_tail(list); - if (!_skb || (msg_destport(buf_msg(_skb)) != dport) || - (skb_queue_len(list) > 32)) - rv = true; - __skb_queue_tail(list, skb); - spin_unlock_bh(&list->lock); - return rv; -} - /* tipc_skb_queue_sorted(); sort pkt into list according to sequence number * @list: list to be appended to * @skb: buffer to add diff --git a/net/tipc/node.c b/net/tipc/node.c index cdca57be85bf..9e9b0938bd17 100644 --- a/net/tipc/node.c +++ b/net/tipc/node.c @@ -873,10 +873,8 @@ static void node_lost_contact(struct tipc_node *n_ptr, SHORT_H_SIZE, 0, tn->own_addr, conn->peer_node, conn->port, conn->peer_port, TIPC_ERR_NO_NODE); - if (likely(skb)) { + if (likely(skb)) skb_queue_tail(inputq, skb); - n_ptr->action_flags |= TIPC_MSG_EVT; - } list_del(&conn->list); kfree(conn); } @@ -923,27 +921,20 @@ void tipc_node_unlock(struct tipc_node *node) u32 flags = node->action_flags; u32 link_id = 0; struct list_head *publ_list; - struct sk_buff_head *inputq = node->inputq; - struct sk_buff_head *namedq; - if (likely(!flags || (flags == TIPC_MSG_EVT))) { - node->action_flags = 0; + if (likely(!flags)) { spin_unlock_bh(&node->lock); - if (flags == TIPC_MSG_EVT) - tipc_sk_rcv(net, inputq); return; } addr = node->addr; link_id = node->link_id; - namedq = node->namedq; publ_list = &node->publ_list; - node->action_flags &= ~(TIPC_MSG_EVT | - TIPC_NOTIFY_NODE_DOWN | TIPC_NOTIFY_NODE_UP | + node->action_flags &= ~(TIPC_NOTIFY_NODE_DOWN | TIPC_NOTIFY_NODE_UP | TIPC_NOTIFY_LINK_DOWN | TIPC_NOTIFY_LINK_UP | TIPC_WAKEUP_BCAST_USERS | TIPC_BCAST_MSG_EVT | - TIPC_NAMED_MSG_EVT | TIPC_BCAST_RESET); + TIPC_BCAST_RESET); spin_unlock_bh(&node->lock); @@ -964,12 +955,6 @@ void tipc_node_unlock(struct tipc_node *node) tipc_nametbl_withdraw(net, TIPC_LINK_STATE, addr, link_id, addr); - if (flags & TIPC_MSG_EVT) - tipc_sk_rcv(net, inputq); - - if (flags & TIPC_NAMED_MSG_EVT) - tipc_named_rcv(net, namedq); - if (flags & TIPC_BCAST_MSG_EVT) tipc_bclink_input(net); @@ -1270,6 +1255,9 @@ unlock: if (unlikely(rc & TIPC_LINK_DOWN_EVT)) tipc_node_link_down(n, bearer_id, false); + if (unlikely(!skb_queue_empty(&n->bclink.namedq))) + tipc_named_rcv(net, &n->bclink.namedq); + if (!skb_queue_empty(&le->inputq)) tipc_sk_rcv(net, &le->inputq); diff --git a/net/tipc/node.h b/net/tipc/node.h index 9a977467fc46..344b3e7594fd 100644 --- a/net/tipc/node.h +++ b/net/tipc/node.h @@ -53,13 +53,11 @@ * TIPC_DISTRIBUTE_NAME: publish or withdraw link state name type */ enum { - TIPC_MSG_EVT = 1, TIPC_NOTIFY_NODE_DOWN = (1 << 3), TIPC_NOTIFY_NODE_UP = (1 << 4), TIPC_WAKEUP_BCAST_USERS = (1 << 5), TIPC_NOTIFY_LINK_UP = (1 << 6), TIPC_NOTIFY_LINK_DOWN = (1 << 7), - TIPC_NAMED_MSG_EVT = (1 << 8), TIPC_BCAST_MSG_EVT = (1 << 9), TIPC_BCAST_RESET = (1 << 10) }; @@ -124,8 +122,6 @@ struct tipc_node { spinlock_t lock; struct net *net; struct hlist_node hash; - struct sk_buff_head *inputq; - struct sk_buff_head *namedq; int active_links[2]; struct tipc_link_entry links[MAX_BEARERS]; int action_flags;