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Date:   Tue, 13 Oct 2020 13:18:10 +0700
From:   Hoang Huu Le <>
Subject: [net] tipc: re-configure queue limit for broadcast link

The queue limit of the broadcast link is being calculated base on initial
MTU. However, when MTU value changed (e.g manual changing MTU on NIC
device, MTU negotiation etc.,) we do not re-calculate queue limit.
This gives throughput does not reflect with the change.

So fix it by calling the function to re-calculate queue limit of the
broadcast link.

Acked-by: Jon Maloy <>
Signed-off-by: Hoang Huu Le <>
 net/tipc/bcast.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/net/tipc/bcast.c b/net/tipc/bcast.c
index 940d176e0e87..c77fd13e2777 100644
--- a/net/tipc/bcast.c
+++ b/net/tipc/bcast.c
@@ -108,6 +108,7 @@ static void tipc_bcbase_select_primary(struct net *net)
 	struct tipc_bc_base *bb = tipc_bc_base(net);
 	int all_dests =  tipc_link_bc_peers(bb->link);
+	int max_win = tipc_link_max_win(bb->link);
 	int i, mtu, prim;
 	bb->primary_bearer = INVALID_BEARER_ID;
@@ -121,8 +122,11 @@ static void tipc_bcbase_select_primary(struct net *net)
 		mtu = tipc_bearer_mtu(net, i);
-		if (mtu < tipc_link_mtu(bb->link))
+		if (mtu < tipc_link_mtu(bb->link)) {
 			tipc_link_set_mtu(bb->link, mtu);
+			tipc_link_set_queue_limits(bb->link, max_win,
+						   max_win);
+		}
 		bb->bcast_support &= tipc_bearer_bcast_support(net, i);
 		if (bb->dests[i] < all_dests)

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