Merge branch 'faster-soreuseport'

Craig Gallek says:

====================
Faster SO_REUSEPORT

This series contains two optimizations for the SO_REUSEPORT feature:
Faster lookup when selecting a socket for an incoming packet and
the ability to select the socket from the group using a BPF program.

This series only includes the UDP path.  I plan to submit a follow-up
including the TCP path if the implementation in this series is
acceptable.

Changes in v4:
- pskb_may_pull is unnecessary with pskb_pull (per Alexei Starovoitov)

Changes in v3:
- skb_pull_inline -> pskb_pull (per Alexei Starovoitov)
- reuseport_attach* -> sk_reuseport_attach* and simple return statement
  syntax change (per Daniel Borkmann)

Changes in v2:
- Fix ARM build; remove unnecessary include.
- Handle case where protocol header is not in linear section (per
  Alexei Starovoitov).
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 28 insertions, 0 deletions

diff --git a/include/net/sock_reuseport.h b/include/net/sock_reuseport.h
new file mode 100644
index 0000000..7dda3d7
--- /dev/null
+++ b/include/net/sock_reuseport.h
@@ -0,0 +1,28 @@
+#ifndef _SOCK_REUSEPORT_H
+#define _SOCK_REUSEPORT_H
+
+#include <linux/filter.h>
+#include <linux/skbuff.h>
+#include <linux/types.h>
+#include <net/sock.h>
+
+struct sock_reuseport {
+	struct rcu_head		rcu;
+
+	u16			max_socks;	/* length of socks */
+	u16			num_socks;	/* elements in socks */
+	struct bpf_prog __rcu	*prog;		/* optional BPF sock selector */
+	struct sock		*socks[0];	/* array of sock pointers */
+};
+
+extern int reuseport_alloc(struct sock *sk);
+extern int reuseport_add_sock(struct sock *sk, const struct sock *sk2);
+extern void reuseport_detach_sock(struct sock *sk);
+extern struct sock *reuseport_select_sock(struct sock *sk,
+					  u32 hash,
+					  struct sk_buff *skb,
+					  int hdr_len);
+extern struct bpf_prog *reuseport_attach_prog(struct sock *sk,
+					      struct bpf_prog *prog);
+
+#endif  /* _SOCK_REUSEPORT_H */