dccp ccid-3: Remove redundant 'options_received' struct

The `options_received' struct is redundant, since it re-duplicates the existing
`p' and `x_recv' fields. This patch removes the sub-struct and migrates the
format conversion operations to ccid3_hc_tx_parse_options().

Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>

diff --git a/net/dccp/ccids/ccid3.c b/net/dccp/ccids/ccid3.c
index 9715eeb..c3f3a25 100644 (file)
--- a/net/dccp/ccids/ccid3.c
+++ b/net/dccp/ccids/ccid3.c
@@ -365,11 +365,10 @@ static void ccid3_hc_tx_packet_sent(struct sock *sk, int more,
 static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb)
 {
        struct ccid3_hc_tx_sock *hc = ccid3_hc_tx_sk(sk);
-       struct ccid3_options_received *opt_recv = &hc->tx_options_received;
        struct tfrc_tx_hist_entry *acked;
        ktime_t now;
        unsigned long t_nfb;
-       u32 pinv, r_sample;
+       u32 r_sample;
 
        /* we are only interested in ACKs */
        if (!(DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK ||
@@ -394,17 +393,6 @@ static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb)
        r_sample  = dccp_sample_rtt(sk, ktime_us_delta(now, acked->stamp));
        hc->tx_rtt = tfrc_ewma(hc->tx_rtt, r_sample, 9);
 
-       /* Update receive rate in units of 64 * bytes/second */
-       hc->tx_x_recv = opt_recv->ccid3or_receive_rate;
-       hc->tx_x_recv <<= 6;
-
-       /* Update loss event rate (which is scaled by 1e6) */
-       pinv = opt_recv->ccid3or_loss_event_rate;
-       if (pinv == 0)
-               hc->tx_p = 0;
-       else
-               hc->tx_p = tfrc_invert_loss_event_rate(pinv);
-
        /*
         * Update allowed sending rate X as per draft rfc3448bis-00, 4.2/3
         */
@@ -476,7 +464,6 @@ static int ccid3_hc_tx_parse_options(struct sock *sk, u8 packet_type,
                                     u8 option, u8 *optval, u8 optlen)
 {
        struct ccid3_hc_tx_sock *hc = ccid3_hc_tx_sk(sk);
-       struct ccid3_options_received *opt_recv = &hc->tx_options_received;
        __be32 opt_val;
 
        switch (option) {
@@ -493,11 +480,16 @@ static int ccid3_hc_tx_parse_options(struct sock *sk, u8 packet_type,
                opt_val = ntohl(get_unaligned((__be32 *)optval));
 
                if (option == TFRC_OPT_RECEIVE_RATE) {
-                       opt_recv->ccid3or_receive_rate = opt_val;
+                       /* Receive Rate is kept in units of 64 bytes/second */
+                       hc->tx_x_recv = opt_val;
+                       hc->tx_x_recv <<= 6;
+
                        ccid3_pr_debug("%s(%p), RECEIVE_RATE=%u\n",
                                       dccp_role(sk), sk, opt_val);
                } else {
-                       opt_recv->ccid3or_loss_event_rate = opt_val;
+                       /* Update the fixpoint Loss Event Rate fraction */
+                       hc->tx_p = tfrc_invert_loss_event_rate(opt_val);
+
                        ccid3_pr_debug("%s(%p), LOSS_EVENT_RATE=%u\n",
                                       dccp_role(sk), sk, opt_val);
                }

diff --git a/net/dccp/ccids/ccid3.h b/net/dccp/ccids/ccid3.h
index 89b047b..1a9933c 100644 (file)
--- a/net/dccp/ccids/ccid3.h
+++ b/net/dccp/ccids/ccid3.h
@@ -67,11 +67,6 @@ enum ccid3_options {
        TFRC_OPT_RECEIVE_RATE    = 194,
 };
 
-struct ccid3_options_received {
-       u32 ccid3or_loss_event_rate;
-       u32 ccid3or_receive_rate;
-};
-
 /* TFRC sender states */
 enum ccid3_hc_tx_states {
        TFRC_SSTATE_NO_SENT = 1,
@@ -97,7 +92,6 @@ enum ccid3_hc_tx_states {
  * @tx_t_ld:             Time last doubled during slow start
  * @tx_t_nom:            Nominal send time of next packet
  * @tx_hist:             Packet history
- * @tx_options_received:  Parsed set of retrieved options
  */
 struct ccid3_hc_tx_sock {
        u64                             tx_x;
@@ -115,7 +109,6 @@ struct ccid3_hc_tx_sock {
        ktime_t                         tx_t_ld;
        ktime_t                         tx_t_nom;
        struct tfrc_tx_hist_entry       *tx_hist;
-       struct ccid3_options_received   tx_options_received;
 };
 
 static inline struct ccid3_hc_tx_sock *ccid3_hc_tx_sk(const struct sock *sk)