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authorArnaldo Carvalho de Melo <acme@ghostprotocols.net>2005-06-18 22:46:52 -0700
committerDavid S. Miller <davem@davemloft.net>2005-06-18 22:46:52 -0700
commit2e6599cb899ba4b133f42cbf9d2b1883d2dc583a (patch)
treeb5d4fcca4d2a515fc3d3d20cefaaeebd8dbf661f /include/net/request_sock.h
parent1944972d3bb651474a5021c9da8d0166ae19f1eb (diff)
downloadop-kernel-dev-2e6599cb899ba4b133f42cbf9d2b1883d2dc583a.zip
op-kernel-dev-2e6599cb899ba4b133f42cbf9d2b1883d2dc583a.tar.gz
[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>
Diffstat (limited to 'include/net/request_sock.h')
-rw-r--r--include/net/request_sock.h77
1 files changed, 77 insertions, 0 deletions
diff --git a/include/net/request_sock.h b/include/net/request_sock.h
new file mode 100644
index 0000000..9502f55
--- /dev/null
+++ b/include/net/request_sock.h
@@ -0,0 +1,77 @@
+/*
+ * NET Generic infrastructure for Network protocols.
+ *
+ * Definitions for request_sock
+ *
+ * Authors: Arnaldo Carvalho de Melo <acme@conectiva.com.br>
+ *
+ * From code originally in include/net/tcp.h
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+#ifndef _REQUEST_SOCK_H
+#define _REQUEST_SOCK_H
+
+#include <linux/slab.h>
+#include <linux/types.h>
+#include <net/sock.h>
+
+struct open_request;
+struct sk_buff;
+struct dst_entry;
+struct proto;
+
+struct or_calltable {
+ int family;
+ kmem_cache_t *slab;
+ int obj_size;
+ int (*rtx_syn_ack)(struct sock *sk,
+ struct open_request *req,
+ struct dst_entry *dst);
+ void (*send_ack)(struct sk_buff *skb,
+ struct open_request *req);
+ void (*send_reset)(struct sk_buff *skb);
+ void (*destructor)(struct open_request *req);
+};
+
+/* struct open_request - mini sock to represent a connection request
+ */
+struct open_request {
+ struct open_request *dl_next; /* Must be first member! */
+ u16 mss;
+ u8 retrans;
+ u8 __pad;
+ /* The following two fields can be easily recomputed I think -AK */
+ u32 window_clamp; /* window clamp at creation time */
+ u32 rcv_wnd; /* rcv_wnd offered first time */
+ u32 ts_recent;
+ unsigned long expires;
+ struct or_calltable *class;
+ struct sock *sk;
+};
+
+static inline struct open_request *tcp_openreq_alloc(struct or_calltable *class)
+{
+ struct open_request *req = kmem_cache_alloc(class->slab, SLAB_ATOMIC);
+
+ if (req != NULL)
+ req->class = class;
+
+ return req;
+}
+
+static inline void tcp_openreq_fastfree(struct open_request *req)
+{
+ kmem_cache_free(req->class->slab, req);
+}
+
+static inline void tcp_openreq_free(struct open_request *req)
+{
+ req->class->destructor(req);
+ tcp_openreq_fastfree(req);
+}
+
+#endif /* _REQUEST_SOCK_H */
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