netdev - [PATCH v3 net-next 1/6] tcp: Add clean acked data hook

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Date:   Mon, 18 Dec 2017 13:10:28 +0200
From:   Ilya Lesokhin <ilyal@...lanox.com>
To:     netdev@...r.kernel.org, davem@...emloft.net
Cc:     davejwatson@...com, tom@...bertland.com,
        hannes@...essinduktion.org, borisp@...lanox.com,
        aviadye@...lanox.com, liranl@...lanox.com,
        Ilya Lesokhin <ilyal@...lanox.com>
Subject: [PATCH v3 net-next 1/6] tcp: Add clean acked data hook

Called when a TCP segment is acknowledged.
Could be used by application protocols who hold additional
metadata associated with the stream data
This is required by TLS device offload to release
metadata associated with acknowledged TLS records.

Signed-off-by: Boris Pismenny <borisp@...lanox.com>
Signed-off-by: Ilya Lesokhin <ilyal@...lanox.com>
Signed-off-by: Aviad Yehezkel <aviadye@...lanox.com>
---
 include/net/inet_connection_sock.h | 2 ++
 net/ipv4/tcp_input.c               | 3 +++
 2 files changed, 5 insertions(+)

diff --git a/include/net/inet_connection_sock.h b/include/net/inet_connection_sock.h
index 8e1bf9ae4a5e..ec405a667a85 100644
--- a/include/net/inet_connection_sock.h
+++ b/include/net/inet_connection_sock.h
@@ -77,6 +77,7 @@ struct inet_connection_sock_af_ops {
  * @icsk_af_ops		   Operations which are AF_INET{4,6} specific
  * @icsk_ulp_ops	   Pluggable ULP control hook
  * @icsk_ulp_data	   ULP private data
+ * @icsk_clean_acked	   Clean acked data hook
  * @icsk_listen_portaddr_node	hash to the portaddr listener hashtable
  * @icsk_ca_state:	   Congestion control state
  * @icsk_retransmits:	   Number of unrecovered [RTO] timeouts
@@ -102,6 +103,7 @@ struct inet_connection_sock {
 	const struct inet_connection_sock_af_ops *icsk_af_ops;
 	const struct tcp_ulp_ops  *icsk_ulp_ops;
 	void			  *icsk_ulp_data;
+	void			  (*icsk_clean_acked)(struct sock *sk);
 	struct hlist_node         icsk_listen_portaddr_node;
 	unsigned int		  (*icsk_sync_mss)(struct sock *sk, u32 pmtu);
 	__u8			  icsk_ca_state:6,
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 4d55c4b338ee..961abc5be84c 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -3592,6 +3592,9 @@ static int tcp_ack(struct sock *sk, const struct sk_buff *skb, int flag)
 	if (!prior_packets)
 		goto no_queue;
 
+	if (icsk->icsk_clean_acked)
+		icsk->icsk_clean_acked(sk);
+
 	/* See if we can take anything off of the retransmit queue. */
 	flag |= tcp_clean_rtx_queue(sk, prior_fack, prior_snd_una, &sack_state);
 
-- 
2.15.0.317.g14c63a9