tipc: eliminate redundant buffer cloning at transmission
Since all packet transmitters (link, bcast, discovery) are now sending
consumable buffer clones to the bearer layer, we can remove the
redundant buffer cloning that is perfomed in the lower level functions
tipc_l2_send_msg() and tipc_udp_send_msg().
Signed-off-by: Jon Maloy <jon.maloy@ericsson.com>
Reviewed-by: Ying Xue <ying.xue@windriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/tipc/bearer.c b/net/tipc/bearer.c
index 1133391..c3fa13a 100644
--- a/net/tipc/bearer.c
+++ b/net/tipc/bearer.c
@@ -414,10 +414,9 @@
* @b_ptr: the bearer through which the packet is to be sent
* @dest: peer destination address
*/
-int tipc_l2_send_msg(struct net *net, struct sk_buff *buf,
+int tipc_l2_send_msg(struct net *net, struct sk_buff *skb,
struct tipc_bearer *b, struct tipc_media_addr *dest)
{
- struct sk_buff *clone;
struct net_device *dev;
int delta;
@@ -425,23 +424,19 @@
if (!dev)
return 0;
- clone = skb_clone(buf, GFP_ATOMIC);
- if (!clone)
- return 0;
-
- delta = dev->hard_header_len - skb_headroom(buf);
+ delta = dev->hard_header_len - skb_headroom(skb);
if ((delta > 0) &&
- pskb_expand_head(clone, SKB_DATA_ALIGN(delta), 0, GFP_ATOMIC)) {
- kfree_skb(clone);
+ pskb_expand_head(skb, SKB_DATA_ALIGN(delta), 0, GFP_ATOMIC)) {
+ kfree_skb(skb);
return 0;
}
- skb_reset_network_header(clone);
- clone->dev = dev;
- clone->protocol = htons(ETH_P_TIPC);
- dev_hard_header(clone, dev, ETH_P_TIPC, dest->value,
- dev->dev_addr, clone->len);
- dev_queue_xmit(clone);
+ skb_reset_network_header(skb);
+ skb->dev = dev;
+ skb->protocol = htons(ETH_P_TIPC);
+ dev_hard_header(skb, dev, ETH_P_TIPC, dest->value,
+ dev->dev_addr, skb->len);
+ dev_queue_xmit(skb);
return 0;
}
@@ -491,8 +486,6 @@
if (likely(b))
b->media->send_msg(net, skb, b, dest);
rcu_read_unlock();
- /* Until we remove cloning in tipc_l2_send_msg(): */
- kfree_skb(skb);
}
/* tipc_bearer_xmit() -send buffer to destination over bearer
@@ -514,8 +507,6 @@
skb_queue_walk_safe(xmitq, skb, tmp) {
__skb_dequeue(xmitq);
b->media->send_msg(net, skb, b, dst);
- /* Until we remove cloning in tipc_l2_send_msg(): */
- kfree_skb(skb);
}
}
rcu_read_unlock();
@@ -541,8 +532,6 @@
msg_set_mc_netid(hdr, net_id);
__skb_dequeue(xmitq);
b->media->send_msg(net, skb, b, &b->bcast_addr);
- /* Until we remove cloning in tipc_l2_send_msg(): */
- kfree_skb(skb);
}
}
rcu_read_unlock();