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Date: Sat, 26 Jul 2014 15:29:23 -0700 (PDT)
From: Tom Herbert <therbert@...gle.com>
To: davem@...emloft.net, netdev@...r.kernel.org
Subject: [PATCH net-next 1/2] udp: UDP Fast Port
This patch implements fast ports in UDP. The idea is that a kernel
module registers a port and associated receive function. In UDP receive,
the list of fast ports is scanned and the destinaton port is matched
against the registered port. If there is a match, then the receive
function is called to process the packet. When a UDP fast port is used,
we can receive encap'ed packets without performing or accessing a
socket. This is a performance gain, especially since we don't need to
take socket ref count on every packet.
Signed-off-by: Tom Herbert <therbert@...gle.com>
---
include/net/udp.h | 23 +++++++++++++++++++
net/ipv4/udp.c | 69 ++++++++++++++++++++++++++++++++++++++++++++++++++++---
net/ipv6/udp.c | 21 +++++++++++++++--
3 files changed, 108 insertions(+), 5 deletions(-)
diff --git a/include/net/udp.h b/include/net/udp.h
index 70f9413..1a88f4b 100644
--- a/include/net/udp.h
+++ b/include/net/udp.h
@@ -300,6 +300,29 @@ void udp4_proc_exit(void);
int udpv4_offload_init(void);
+/* Definitions for UDP fast port */
+
+#define UFP_HASH_SIZE (16)
+#define UFP_HASH_MASK (UFP_HASH_SIZE - 1)
+
+struct udp_fast_port {
+ __be16 port;
+ int (*encap_rcv)(struct udp_fast_port *ufp, struct sk_buff *skb);
+ void *priv_data;
+ struct list_head list;
+};
+
+extern struct list_head ufp_base[];
+
+static inline struct list_head *ufp_head(const __be16 port)
+{
+ return &ufp_base[ntohs(port) & UFP_HASH_MASK];
+}
+
+void udp_add_fast_port(struct udp_fast_port *ufp);
+void __udp_remove_fast_port(struct udp_fast_port *ufp);
+void udp_remove_fast_port(struct udp_fast_port *ufp);
+
void udp_init(void);
void udp_encap_enable(void);
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index f57c0e4..8cf359a 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -131,6 +131,10 @@ EXPORT_SYMBOL(udp_memory_allocated);
#define MAX_UDP_PORTS 65536
#define PORTS_PER_CHAIN (MAX_UDP_PORTS / UDP_HTABLE_SIZE_MIN)
+struct list_head ufp_base[UFP_HASH_SIZE] __read_mostly;
+EXPORT_SYMBOL(ufp_base);
+static DEFINE_SPINLOCK(ufp_lock);
+
static int udp_lib_lport_inuse(struct net *net, __u16 num,
const struct udp_hslot *hslot,
unsigned long *bitmap,
@@ -1735,6 +1739,7 @@ int __udp4_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
struct rtable *rt = skb_rtable(skb);
__be32 saddr, daddr;
struct net *net = dev_net(skb->dev);
+ int ret;
/*
* Validate the packet.
@@ -1763,7 +1768,6 @@ int __udp4_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
sk = skb_steal_sock(skb);
if (sk) {
struct dst_entry *dst = skb_dst(skb);
- int ret;
if (unlikely(sk->sk_rx_dst != dst))
udp_sk_rx_dst_set(sk, dst);
@@ -1777,16 +1781,33 @@ int __udp4_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
return -ret;
return 0;
} else {
+ struct udp_fast_port *ufp;
+
if (rt->rt_flags & (RTCF_BROADCAST|RTCF_MULTICAST))
return __udp4_lib_mcast_deliver(net, skb, uh,
saddr, daddr, udptable);
+ /* Check for a UDP fast port */
+ list_for_each_entry_rcu(ufp, ufp_head(uh->dest), list) {
+ if (uh->dest != ufp->port)
+ continue;
+
+ /* Verify checksum before giving to encap */
+ if (udp_lib_checksum_complete(skb))
+ goto csum_error;
+
+ ret = ufp->encap_rcv(ufp, skb);
+ if (ret <= 0) {
+ UDP_INC_STATS_BH(net, UDP_MIB_INDATAGRAMS,
+ proto == IPPROTO_UDPLITE);
+ return -ret;
+ }
+ }
+
sk = __udp4_lib_lookup_skb(skb, uh->source, uh->dest, udptable);
}
if (sk != NULL) {
- int ret;
-
ret = udp_queue_rcv_skb(sk, skb);
sock_put(sk);
@@ -1981,6 +2002,44 @@ int udp_rcv(struct sk_buff *skb)
return __udp4_lib_rcv(skb, &udp_table, IPPROTO_UDP);
}
+void udp_add_fast_port(struct udp_fast_port *ufp)
+{
+ struct list_head *head = ufp_head(ufp->port);
+
+ spin_lock(&ufp_lock);
+ list_add_rcu(&ufp->list, head);
+ spin_unlock(&ufp_lock);
+}
+EXPORT_SYMBOL(udp_add_fast_port);
+
+void __udp_remove_fast_port(struct udp_fast_port *ufp)
+{
+ struct list_head *head = ufp_head(ufp->port);
+ struct udp_fast_port *ufp1;
+
+ spin_lock(&ufp_lock);
+
+ list_for_each_entry(ufp1, head, list) {
+ if (ufp == ufp1) {
+ list_del_rcu(&ufp->list);
+ goto out;
+ }
+ }
+
+ pr_warn("udp_remove_fast_port: %p not found\n", ufp);
+out:
+ spin_unlock(&ufp_lock);
+}
+EXPORT_SYMBOL(__udp_remove_fast_port);
+
+void udp_remove_fast_port(struct udp_fast_port *ufp)
+{
+ __udp_remove_fast_port(ufp);
+
+ synchronize_net();
+}
+EXPORT_SYMBOL(udp_remove_fast_port);
+
void udp_destroy_sock(struct sock *sk)
{
struct udp_sock *up = udp_sk(sk);
@@ -2505,6 +2564,7 @@ void __init udp_table_init(struct udp_table *table, const char *name)
void __init udp_init(void)
{
unsigned long limit;
+ int i;
udp_table_init(&udp_table, "UDP");
limit = nr_free_buffer_pages() / 8;
@@ -2515,4 +2575,7 @@ void __init udp_init(void)
sysctl_udp_rmem_min = SK_MEM_QUANTUM;
sysctl_udp_wmem_min = SK_MEM_QUANTUM;
+
+ for (i = 0; i < UFP_HASH_SIZE; i++)
+ INIT_LIST_HEAD(&ufp_base[i]);
}
diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index 5b6091d..e928182 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -830,6 +830,8 @@ int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
struct udphdr *uh;
const struct in6_addr *saddr, *daddr;
u32 ulen = 0;
+ struct udp_fast_port *ufp;
+ int ret;
if (!pskb_may_pull(skb, sizeof(struct udphdr)))
goto discard;
@@ -873,14 +875,29 @@ int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
/* Unicast */
+ /* Check for a UDP fast port */
+ list_for_each_entry_rcu(ufp, ufp_head(uh->dest), list) {
+ if (uh->dest != ufp->port)
+ continue;
+
+ /* Verify checksum before giving to encap */
+ if (udp_lib_checksum_complete(skb))
+ goto csum_error;
+
+ ret = ufp->encap_rcv(ufp, skb);
+ if (ret <= 0) {
+ UDP_INC_STATS_BH(net, UDP_MIB_INDATAGRAMS,
+ proto == IPPROTO_UDPLITE);
+ return -ret;
+ }
+ }
+
/*
* check socket cache ... must talk to Alan about his plans
* for sock caches... i'll skip this for now.
*/
sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable);
if (sk != NULL) {
- int ret;
-
if (!uh->check && !udp_sk(sk)->no_check6_rx) {
sock_put(sk);
udp6_csum_zero_error(skb);
--
2.0.0.526.g5318336
--
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