[PATCH 2/3] dccp ccid-2: Use existing function to test for data packets

[Gerrit Renker <gerrit@erg.abdn.ac.uk>]

This replaces a switch statement with a test using the equivalent function
dccp_data_packet(skb).
It also doubles the range of the field `rx_num_data_pkts' by changing the
type from `int' to `u32' (avoiding signed/unsigned comparison with the u16
field `dccps_r_ack_ratio').

Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
---
 net/dccp/ccids/ccid2.h |    6 +++++-
 net/dccp/ccids/ccid2.c |   16 ++++++----------
 2 files changed, 11 insertions(+), 11 deletions(-)

--- a/net/dccp/ccids/ccid2.h
+++ b/net/dccp/ccids/ccid2.h
@@ -88,8 +88,12 @@ static inline bool ccid2_cwnd_network_limited(struct ccid2_hc_tx_sock *hc)
 	return (hc->tx_pipe >= hc->tx_cwnd);
 }
 
+/**
+ * struct ccid2_hc_rx_sock  -  Receiving end of CCID-2 half-connection
+ * @rx_num_data_pkts: number of data packets received since last feedback
+ */
 struct ccid2_hc_rx_sock {
-	int	rx_data;
+	u32	rx_num_data_pkts;
 };
 
 static inline struct ccid2_hc_tx_sock *ccid2_hc_tx_sk(const struct sock *sk)
--- a/net/dccp/ccids/ccid2.c
+++ b/net/dccp/ccids/ccid2.c
@@ -629,18 +629,14 @@ static void ccid2_hc_tx_exit(struct sock *sk)
 
 static void ccid2_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb)
 {
-	const struct dccp_sock *dp = dccp_sk(sk);
 	struct ccid2_hc_rx_sock *hc = ccid2_hc_rx_sk(sk);
 
-	switch (DCCP_SKB_CB(skb)->dccpd_type) {
-	case DCCP_PKT_DATA:
-	case DCCP_PKT_DATAACK:
-		hc->rx_data++;
-		if (hc->rx_data >= dp->dccps_r_ack_ratio) {
-			dccp_send_ack(sk);
-			hc->rx_data = 0;
-		}
-		break;
+	if (!dccp_data_packet(skb))
+		return;
+
+	if (++hc->rx_num_data_pkts >= dccp_sk(sk)->dccps_r_ack_ratio) {
+		dccp_send_ack(sk);
+		hc->rx_num_data_pkts = 0;
 	}
 }