Linux-libre 4.3.2-gnu

1 files changed, 60 insertions, 9 deletions

diff --git a/net/tipc/bcast.c b/net/tipc/bcast.c
index a816382fc..eadba62af 100644
--- a/net/tipc/bcast.c
+++ b/net/tipc/bcast.c
@@ -42,7 +42,8 @@
 #include "core.h"
 
 #define	MAX_PKT_DEFAULT_MCAST	1500	/* bcast link max packet size (fixed) */
-#define	BCLINK_WIN_DEFAULT	20	/* bcast link window size (default) */
+#define	BCLINK_WIN_DEFAULT	50	/* bcast link window size (default) */
+#define	BCLINK_WIN_MIN	        32	/* bcast minimum link window size */
 
 const char tipc_bclink_name[] = "broadcast-link";
 
@@ -170,6 +171,30 @@ static void bclink_retransmit_pkt(struct tipc_net *tn, u32 after, u32 to)
 }
 
 /**
+ * bclink_prepare_wakeup - prepare users for wakeup after congestion
+ * @bcl: broadcast link
+ * @resultq: queue for users which can be woken up
+ * Move a number of waiting users, as permitted by available space in
+ * the send queue, from link wait queue to specified queue for wakeup
+ */
+static void bclink_prepare_wakeup(struct tipc_link *bcl, struct sk_buff_head *resultq)
+{
+	int pnd[TIPC_SYSTEM_IMPORTANCE + 1] = {0,};
+	int imp, lim;
+	struct sk_buff *skb, *tmp;
+
+	skb_queue_walk_safe(&bcl->wakeupq, skb, tmp) {
+		imp = TIPC_SKB_CB(skb)->chain_imp;
+		lim = bcl->window + bcl->backlog[imp].limit;
+		pnd[imp] += TIPC_SKB_CB(skb)->chain_sz;
+		if ((pnd[imp] + bcl->backlog[imp].len) >= lim)
+			continue;
+		skb_unlink(skb, &bcl->wakeupq);
+		skb_queue_tail(resultq, skb);
+	}
+}
+
+/**
  * tipc_bclink_wakeup_users - wake up pending users
  *
  * Called with no locks taken
@@ -177,8 +202,12 @@ static void bclink_retransmit_pkt(struct tipc_net *tn, u32 after, u32 to)
 void tipc_bclink_wakeup_users(struct net *net)
 {
 	struct tipc_net *tn = net_generic(net, tipc_net_id);
+	struct tipc_link *bcl = tn->bcl;
+	struct sk_buff_head resultq;
 
-	tipc_sk_rcv(net, &tn->bclink->link.wakeupq);
+	skb_queue_head_init(&resultq);
+	bclink_prepare_wakeup(bcl, &resultq);
+	tipc_sk_rcv(net, &resultq);
 }
 
 /**
@@ -316,6 +345,29 @@ void tipc_bclink_update_link_state(struct tipc_node *n_ptr,
 	}
 }
 
+void tipc_bclink_sync_state(struct tipc_node *n, struct tipc_msg *hdr)
+{
+	u16 last = msg_last_bcast(hdr);
+	int mtyp = msg_type(hdr);
+
+	if (unlikely(msg_user(hdr) != LINK_PROTOCOL))
+		return;
+	if (mtyp == STATE_MSG) {
+		tipc_bclink_update_link_state(n, last);
+		return;
+	}
+	/* Compatibility: older nodes don't know BCAST_PROTOCOL synchronization,
+	 * and transfer synch info in LINK_PROTOCOL messages.
+	 */
+	if (tipc_node_is_up(n))
+		return;
+	if ((mtyp != RESET_MSG) && (mtyp != ACTIVATE_MSG))
+		return;
+	n->bclink.last_sent = last;
+	n->bclink.last_in = last;
+	n->bclink.oos_state = 0;
+}
+
 /**
  * bclink_peek_nack - monitor retransmission requests sent by other nodes
  *
@@ -358,10 +410,9 @@ int tipc_bclink_xmit(struct net *net, struct sk_buff_head *list)
 
 	/* Prepare clone of message for local node */
 	skb = tipc_msg_reassemble(list);
-	if (unlikely(!skb)) {
-		__skb_queue_purge(list);
+	if (unlikely(!skb))
 		return -EHOSTUNREACH;
-	}
+
 	/* Broadcast to all nodes */
 	if (likely(bclink)) {
 		tipc_bclink_lock(net);
@@ -413,7 +464,7 @@ static void bclink_accept_pkt(struct tipc_node *node, u32 seqno)
 	 * all nodes in the cluster don't ACK at the same time
 	 */
 	if (((seqno - tn->own_addr) % TIPC_MIN_LINK_WIN) == 0) {
-		tipc_link_proto_xmit(node->active_links[node->addr & 1],
+		tipc_link_proto_xmit(node_active_link(node, node->addr),
 				     STATE_MSG, 0, 0, 0, 0);
 		tn->bcl->stats.sent_acks++;
 	}
@@ -858,9 +909,10 @@ int tipc_bclink_set_queue_limits(struct net *net, u32 limit)
 
 	if (!bcl)
 		return -ENOPROTOOPT;
-	if ((limit < TIPC_MIN_LINK_WIN) || (limit > TIPC_MAX_LINK_WIN))
+	if (limit < BCLINK_WIN_MIN)
+		limit = BCLINK_WIN_MIN;
+	if (limit > TIPC_MAX_LINK_WIN)
 		return -EINVAL;
-
 	tipc_bclink_lock(net);
 	tipc_link_set_queue_limits(bcl, limit);
 	tipc_bclink_unlock(net);
@@ -925,7 +977,6 @@ int tipc_bclink_init(struct net *net)
 	tipc_link_set_queue_limits(bcl, BCLINK_WIN_DEFAULT);
 	bcl->bearer_id = MAX_BEARERS;
 	rcu_assign_pointer(tn->bearer_list[MAX_BEARERS], &bcbearer->bearer);
-	bcl->state = WORKING_WORKING;
 	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);