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Date: Thu, 11 Feb 2016 11:12:01 +0100
From: Paolo Abeni <pabeni@...hat.com>
To: netdev@...r.kernel.org
Cc: "David S. Miller" <davem@...emloft.net>,
Thomas Graf <tgraf@...g.ch>,
Pravin B Shelar <pshelar@...ira.com>,
Jiri Benc <jbenc@...hat.com>,
Hannes Frederic Sowa <hannes@...essinduktion.org>,
Tom Herbert <therbert@...gle.com>
Subject: [PATCH net-next 5/7] net: add dst_cache to ovs vxlan lwtunnel
In case of UDP traffic with datagram length
below MTU this give about 2% performance increase
Signed-off-by: Paolo Abeni <pabeni@...hat.com>
Suggested-and-acked-by: Hannes Frederic Sowa <hannes@...essinduktion.org>
---
drivers/net/vxlan.c | 17 +++++++++--------
include/net/ip_tunnels.h | 1 +
net/openvswitch/Kconfig | 1 +
net/openvswitch/flow.h | 1 +
net/openvswitch/flow_netlink.c | 11 +++++++++++
5 files changed, 23 insertions(+), 8 deletions(-)
diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c
index 59c1337..71c2323 100644
--- a/drivers/net/vxlan.c
+++ b/drivers/net/vxlan.c
@@ -1861,6 +1861,7 @@ static void vxlan_encap_bypass(struct sk_buff *skb, struct vxlan_dev *src_vxlan,
static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
struct vxlan_rdst *rdst, bool did_rsc)
{
+ struct dst_cache *dst_cache;
struct ip_tunnel_info *info;
struct vxlan_dev *vxlan = netdev_priv(dev);
struct sock *sk;
@@ -1886,6 +1887,7 @@ static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
dst_port = rdst->remote_port ? rdst->remote_port : vxlan->cfg.dst_port;
vni = rdst->remote_vni;
dst = &rdst->remote_ip;
+ dst_cache = &rdst->dst_cache;
} else {
if (!info) {
WARN_ONCE(1, "%s: Missing encapsulation instructions\n",
@@ -1900,6 +1902,7 @@ static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
else
remote_ip.sin6.sin6_addr = info->key.u.ipv6.dst;
dst = &remote_ip;
+ dst_cache = info->dst_cache;
}
if (vxlan_addr_any(dst)) {
@@ -1958,9 +1961,9 @@ static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
udp_sum = !!(flags & VXLAN_F_UDP_CSUM);
}
- use_cache = use_cache && rdst && !skb->mark;
+ use_cache = use_cache && dst_cache && !skb->mark;
if (use_cache)
- rt = dst_cache_get_ip4(&rdst->dst_cache, &saddr);
+ rt = dst_cache_get_ip4(dst_cache, &saddr);
else
rt = NULL;
@@ -1977,8 +1980,7 @@ static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
}
if (use_cache)
- dst_cache_set_ip4(&rdst->dst_cache, &rt->dst,
- saddr);
+ dst_cache_set_ip4(dst_cache, &rt->dst, saddr);
}
if (rt->dst.dev == dev) {
@@ -2022,9 +2024,9 @@ static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
goto drop;
sk = vxlan->vn6_sock->sock->sk;
- use_cache = rdst && !skb->mark;
+ use_cache = dst_cache && !skb->mark;
if (use_cache)
- ndst = dst_cache_get_ip6(&rdst->dst_cache, &saddr);
+ ndst = dst_cache_get_ip6(dst_cache, &saddr);
else
ndst = NULL;
@@ -2040,8 +2042,7 @@ static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
}
if (use_cache)
- dst_cache_set_ip6(&rdst->dst_cache, ndst,
- &saddr);
+ dst_cache_set_ip6(dst_cache, ndst, &saddr);
}
if (ndst->dev == dev) {
diff --git a/include/net/ip_tunnels.h b/include/net/ip_tunnels.h
index d66797e..f0e29be 100644
--- a/include/net/ip_tunnels.h
+++ b/include/net/ip_tunnels.h
@@ -58,6 +58,7 @@ struct ip_tunnel_key {
struct ip_tunnel_info {
struct ip_tunnel_key key;
+ struct dst_cache *dst_cache;
u8 options_len;
u8 mode;
};
diff --git a/net/openvswitch/Kconfig b/net/openvswitch/Kconfig
index d143aa9..cd5fd9d 100644
--- a/net/openvswitch/Kconfig
+++ b/net/openvswitch/Kconfig
@@ -10,6 +10,7 @@ config OPENVSWITCH
select LIBCRC32C
select MPLS
select NET_MPLS_GSO
+ select DST_CACHE
---help---
Open vSwitch is a multilayer Ethernet switch targeted at virtualized
environments. In addition to supporting a variety of features
diff --git a/net/openvswitch/flow.h b/net/openvswitch/flow.h
index 1d055c5..edaf6ca 100644
--- a/net/openvswitch/flow.h
+++ b/net/openvswitch/flow.h
@@ -48,6 +48,7 @@ struct sk_buff;
struct ovs_tunnel_info {
struct metadata_dst *tun_dst;
+ struct dst_cache dst_cache;
};
#define OVS_SW_FLOW_KEY_METADATA_SIZE \
diff --git a/net/openvswitch/flow_netlink.c b/net/openvswitch/flow_netlink.c
index d1bd4a4..f181186 100644
--- a/net/openvswitch/flow_netlink.c
+++ b/net/openvswitch/flow_netlink.c
@@ -1698,6 +1698,7 @@ static void ovs_nla_free_set_action(const struct nlattr *a)
case OVS_KEY_ATTR_TUNNEL_INFO:
ovs_tun = nla_data(ovs_key);
dst_release((struct dst_entry *)ovs_tun->tun_dst);
+ dst_cache_destroy(&ovs_tun->dst_cache);
break;
}
}
@@ -1928,6 +1929,7 @@ static int validate_and_copy_set_tun(const struct nlattr *attr,
{
struct sw_flow_match match;
struct sw_flow_key key;
+ struct dst_cache dst_cache;
struct metadata_dst *tun_dst;
struct ip_tunnel_info *tun_info;
struct ovs_tunnel_info *ovs_tun;
@@ -1959,15 +1961,24 @@ static int validate_and_copy_set_tun(const struct nlattr *attr,
if (!tun_dst)
return -ENOMEM;
+ err = dst_cache_init(&dst_cache, GFP_KERNEL);
+ if (err) {
+ dst_release((struct dst_entry *)tun_dst);
+ return err;
+ }
+
a = __add_action(sfa, OVS_KEY_ATTR_TUNNEL_INFO, NULL,
sizeof(*ovs_tun), log);
if (IS_ERR(a)) {
dst_release((struct dst_entry *)tun_dst);
+ dst_cache_destroy(&dst_cache);
return PTR_ERR(a);
}
ovs_tun = nla_data(a);
ovs_tun->tun_dst = tun_dst;
+ ovs_tun->dst_cache = dst_cache;
+ tun_dst->u.tun_info.dst_cache = &ovs_tun->dst_cache;
tun_info = &tun_dst->u.tun_info;
tun_info->mode = IP_TUNNEL_INFO_TX;
--
1.8.3.1
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