[NET] Generalise TCP's struct open_request minisock infrastructure
Kept this first changeset minimal, without changing existing names to
ease peer review.
Basicaly tcp_openreq_alloc now receives the or_calltable, that in turn
has two new members:
->slab, that replaces tcp_openreq_cachep
->obj_size, to inform the size of the openreq descendant for
a specific protocol
The protocol specific fields in struct open_request were moved to a
class hierarchy, with the things that are common to all connection
oriented PF_INET protocols in struct inet_request_sock, the TCP ones
in tcp_request_sock, that is an inet_request_sock, that is an
open_request.
I.e. this uses the same approach used for the struct sock class
hierarchy, with sk_prot indicating if the protocol wants to use the
open_request infrastructure by filling in sk_prot->rsk_prot with an
or_calltable.
Results? Performance is improved and TCP v4 now uses only 64 bytes per
open request minisock, down from 96 without this patch :-)
Next changeset will rename some of the structs, fields and functions
mentioned above, struct or_calltable is way unclear, better name it
struct request_sock_ops, s/struct open_request/struct request_sock/g,
etc.
Signed-off-by: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/ip.h b/include/linux/ip.h
index 8438c68..d5b7c90 100644
--- a/include/linux/ip.h
+++ b/include/linux/ip.h
@@ -81,6 +81,7 @@
#ifdef __KERNEL__
#include <linux/config.h>
#include <linux/types.h>
+#include <net/request_sock.h>
#include <net/sock.h>
#include <linux/igmp.h>
#include <net/flow.h>
@@ -107,6 +108,26 @@
#define optlength(opt) (sizeof(struct ip_options) + opt->optlen)
+struct inet_request_sock {
+ struct open_request req;
+ u32 loc_addr;
+ u32 rmt_addr;
+ u16 rmt_port;
+ u16 snd_wscale : 4,
+ rcv_wscale : 4,
+ tstamp_ok : 1,
+ sack_ok : 1,
+ wscale_ok : 1,
+ ecn_ok : 1,
+ acked : 1;
+ struct ip_options *opt;
+};
+
+static inline struct inet_request_sock *inet_rsk(const struct open_request *sk)
+{
+ return (struct inet_request_sock *)sk;
+}
+
struct ipv6_pinfo;
struct inet_sock {