From 041d38740d64e295b18de68164ea2ef5d3fd52f8 Mon Sep 17 00:00:00 2001
From: Paul Sokolovsky <paul.sokolovsky@linaro.org>
Date: Thu, 11 May 2017 13:49:16 +0300
Subject: [PATCH] net: context, pkt: Changes for Sockets API

Two changes are required so far:

* There's unavoidable need to have a per-socket queue of packets
(for data sockets) or pending connections (for listening sockets).
These queues share the same space (as a C union).
* There's a need to track "EOF" status of connection, synchronized
with a queue of pending packets (i.e. EOF status should be processed
only when all pending packets are processed). A natural place to
store it per-packet then, and we had a "sent" bit which was used
only for outgoing packets, recast it as "eof" for incoming socket
packets.

Signed-off-by: Paul Sokolovsky <paul.sokolovsky@linaro.org>
---
 include/net/net_context.h |  8 ++++++++
 include/net/net_pkt.h     | 20 +++++++++++++++++---
 2 files changed, 25 insertions(+), 3 deletions(-)

diff --git a/include/net/net_context.h b/include/net/net_context.h
index e0d1c7cdf6e..e7d20279012 100644
--- a/include/net/net_context.h
+++ b/include/net/net_context.h
@@ -237,6 +237,14 @@ struct net_context {
 	/** TCP connection information */
 	struct net_tcp *tcp;
 #endif /* CONFIG_NET_TCP */
+
+#if defined(CONFIG_NET_SOCKETS)
+	/** Per-socket packet or connection queues */
+	union {
+		struct k_fifo recv_q;
+		struct k_fifo accept_q;
+	};
+#endif /* CONFIG_NET_SOCKETS */
 };
 
 static inline bool net_context_is_used(struct net_context *context)
diff --git a/include/net/net_pkt.h b/include/net/net_pkt.h
index 3d38349f06a..da4fa6b6a21 100644
--- a/include/net/net_pkt.h
+++ b/include/net/net_pkt.h
@@ -71,7 +71,9 @@ struct net_pkt {
 	sys_snode_t sent_list;
 #endif
 
-	u8_t sent       : 1;	/* Is this sent or not
+	u8_t sent_or_eof: 1;	/* For outgoing packet: is this sent or not
+				 * For incoming packet of a socket: last
+				 * packet before EOF
 				 * Used only if defined(CONFIG_NET_TCP)
 				 */
 	u8_t forwarding : 1;	/* Are we forwarding this pkt
@@ -188,13 +190,25 @@ static inline void net_pkt_set_next_hdr(struct net_pkt *pkt, u8_t *hdr)
 #if defined(CONFIG_NET_TCP)
 static inline u8_t net_pkt_sent(struct net_pkt *pkt)
 {
-	return pkt->sent;
+	return pkt->sent_or_eof;
 }
 
 static inline void net_pkt_set_sent(struct net_pkt *pkt, bool sent)
 {
-	pkt->sent = sent;
+	pkt->sent_or_eof = sent;
 }
+
+#if defined(CONFIG_NET_SOCKETS)
+static inline u8_t net_pkt_eof(struct net_pkt *pkt)
+{
+	return pkt->sent_or_eof;
+}
+
+static inline void net_pkt_set_eof(struct net_pkt *pkt, bool eof)
+{
+	pkt->sent_or_eof = eof;
+}
+#endif
 #endif
 
 #if defined(CONFIG_NET_ROUTE)