netdev - [PATCH net-next 3/7] inet: add rsk_refcnt/ireq

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Message-Id: <1426197016-14482-4-git-send-email-edumazet@google.com>
Date:	Thu, 12 Mar 2015 14:50:12 -0700
From:	Eric Dumazet <edumazet@...gle.com>
To:	"David S. Miller" <davem@...emloft.net>
Cc:	netdev@...r.kernel.org, Eric Dumazet <edumazet@...gle.com>
Subject: [PATCH net-next 3/7] inet: add rsk_refcnt/ireq_refcnt to request socks

When request socks will be in ehash, they'll need to be refcounted.

This patch adds rsk_refcnt/ireq_refcnt macros, and adds
reqsk_put() function, but nothing yet use them.

Signed-off-by: Eric Dumazet <edumazet@...gle.com>
---
 include/net/inet_sock.h    | 1 +
 include/net/request_sock.h | 8 ++++++++
 2 files changed, 9 insertions(+)

diff --git a/include/net/inet_sock.h b/include/net/inet_sock.h
index e6991bff91b0..dd8a8e37fa9e 100644
--- a/include/net/inet_sock.h
+++ b/include/net/inet_sock.h
@@ -80,6 +80,7 @@ struct inet_request_sock {
 #define ir_cookie		req.__req_common.skc_cookie
 #define ireq_net		req.__req_common.skc_net
 #define ireq_state		req.__req_common.skc_state
+#define ireq_refcnt		req.__req_common.skc_refcnt
 
 	kmemcheck_bitfield_begin(flags);
 	u16			snd_wscale : 4,
diff --git a/include/net/request_sock.h b/include/net/request_sock.h
index 7f830ff67f08..e255ecf8bb40 100644
--- a/include/net/request_sock.h
+++ b/include/net/request_sock.h
@@ -49,6 +49,8 @@ int inet_rtx_syn_ack(struct sock *parent, struct request_sock *req);
  */
 struct request_sock {
 	struct sock_common		__req_common;
+#define rsk_refcnt			__req_common.skc_refcnt
+
 	struct request_sock		*dl_next;
 	u16				mss;
 	u8				num_retrans; /* number of retransmits */
@@ -86,6 +88,12 @@ static inline void reqsk_free(struct request_sock *req)
 	__reqsk_free(req);
 }
 
+static inline void reqsk_put(struct request_sock *req)
+{
+	if (atomic_dec_and_test(&req->rsk_refcnt))
+		reqsk_free(req);
+}
+
 extern int sysctl_max_syn_backlog;
 
 /** struct listen_sock - listen state
-- 
2.2.0.rc0.207.ga3a616c

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