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authorJon Paul Maloy <jon.maloy@ericsson.com>2015-10-22 08:51:45 -0400
committerDavid S. Miller <davem@davemloft.net>2015-10-24 06:56:44 -0700
commit7214bcf8753109256d635ba079938fbd6fcf713b (patch)
tree68362919c4ba243fa20d31fb35e9f485e1b024bc /net
parent60852d679575b0d7ce62497938116f92654ae908 (diff)
downloadlinux-7214bcf8753109256d635ba079938fbd6fcf713b.tar.bz2
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>
Diffstat (limited to 'net')
-rw-r--r--net/tipc/bearer.c31
-rw-r--r--net/tipc/udp_media.c12
2 files changed, 15 insertions, 28 deletions
diff --git a/net/tipc/bearer.c b/net/tipc/bearer.c
index 11333916279f..c3fa13a92ac8 100644
--- a/net/tipc/bearer.c
+++ b/net/tipc/bearer.c
@@ -414,10 +414,9 @@ void tipc_disable_l2_media(struct tipc_bearer *b)
* @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 @@ int tipc_l2_send_msg(struct net *net, struct sk_buff *buf,
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 @@ void tipc_bearer_xmit_skb(struct net *net, u32 bearer_id,
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 @@ void tipc_bearer_xmit(struct net *net, u32 bearer_id,
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 @@ void tipc_bearer_bc_xmit(struct net *net, u32 bearer_id,
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();
diff --git a/net/tipc/udp_media.c b/net/tipc/udp_media.c
index 0021c01dec17..816914ef228d 100644
--- a/net/tipc/udp_media.c
+++ b/net/tipc/udp_media.c
@@ -155,14 +155,12 @@ static int tipc_udp_send_msg(struct net *net, struct sk_buff *skb,
struct udp_bearer *ub;
struct udp_media_addr *dst = (struct udp_media_addr *)&dest->value;
struct udp_media_addr *src = (struct udp_media_addr *)&b->addr.value;
- struct sk_buff *clone;
struct rtable *rt;
if (skb_headroom(skb) < UDP_MIN_HEADROOM)
pskb_expand_head(skb, UDP_MIN_HEADROOM, 0, GFP_ATOMIC);
- clone = skb_clone(skb, GFP_ATOMIC);
- skb_set_inner_protocol(clone, htons(ETH_P_TIPC));
+ skb_set_inner_protocol(skb, htons(ETH_P_TIPC));
ub = rcu_dereference_rtnl(b->media_ptr);
if (!ub) {
err = -ENODEV;
@@ -172,7 +170,7 @@ static int tipc_udp_send_msg(struct net *net, struct sk_buff *skb,
struct flowi4 fl = {
.daddr = dst->ipv4.s_addr,
.saddr = src->ipv4.s_addr,
- .flowi4_mark = clone->mark,
+ .flowi4_mark = skb->mark,
.flowi4_proto = IPPROTO_UDP
};
rt = ip_route_output_key(net, &fl);
@@ -181,7 +179,7 @@ static int tipc_udp_send_msg(struct net *net, struct sk_buff *skb,
goto tx_error;
}
ttl = ip4_dst_hoplimit(&rt->dst);
- err = udp_tunnel_xmit_skb(rt, ub->ubsock->sk, clone,
+ err = udp_tunnel_xmit_skb(rt, ub->ubsock->sk, skb,
src->ipv4.s_addr,
dst->ipv4.s_addr, 0, ttl, 0,
src->udp_port, dst->udp_port,
@@ -204,7 +202,7 @@ static int tipc_udp_send_msg(struct net *net, struct sk_buff *skb,
if (err)
goto tx_error;
ttl = ip6_dst_hoplimit(ndst);
- err = udp_tunnel6_xmit_skb(ndst, ub->ubsock->sk, clone,
+ err = udp_tunnel6_xmit_skb(ndst, ub->ubsock->sk, skb,
ndst->dev, &src->ipv6,
&dst->ipv6, 0, ttl, src->udp_port,
dst->udp_port, false);
@@ -213,7 +211,7 @@ static int tipc_udp_send_msg(struct net *net, struct sk_buff *skb,
return err;
tx_error:
- kfree_skb(clone);
+ kfree_skb(skb);
return err;
}