tipc: eliminate unnecessary skb expansion during retransmission

We increase the allocated headroom for the buffer copies to be
retransmitted. This eliminates the need for the lower stack levels
(UDP/IP/L2) to expand the headroom in order to add their own headers.

Signed-off-by: Jon Maloy <jon.maloy@ericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/tipc/link.c b/net/tipc/link.c
index af50b53..aa79bf8 100644 (file)
--- a/net/tipc/link.c
+++ b/net/tipc/link.c
@@ -1125,7 +1125,7 @@ static int tipc_link_bc_retrans(struct tipc_link *l, struct tipc_link *r,
                                continue;
                        TIPC_SKB_CB(skb)->nxt_retr = jiffies + TIPC_BC_RETR_LIM;
                }
-               _skb = __pskb_copy(skb, MIN_H_SIZE, GFP_ATOMIC);
+               _skb = __pskb_copy(skb, LL_MAX_HEADER + MIN_H_SIZE, GFP_ATOMIC);
                if (!_skb)
                        return 0;
                hdr = buf_msg(_skb);