[CCID3]: Calculate the RTT in the RX half connection

Using TIMESTAMP_ECHO and ELAPSED_TIME options received.

Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 38 insertions, 29 deletions

diff --git a/net/dccp/ccids/ccid3.c b/net/dccp/ccids/ccid3.c
index ffd5b449f5f1..48c36afa4934 100644
--- a/net/dccp/ccids/ccid3.c
+++ b/net/dccp/ccids/ccid3.c
@@ -1010,7 +1010,6 @@ static void ccid3_hc_tx_packet_sent(struct sock *sk, int more, int len)
         struct ccid3_hc_tx_sock *hctx = dp->dccps_hc_tx_ccid_private;
         struct timeval now;
 
-//      ccid3_pr_debug("%s, sk=%p, more=%d, len=%d\n", dccp_role(sk), sk, more, len);
         BUG_ON(hctx == NULL);
 
         if (hctx->ccid3hctx_state == TFRC_SSTATE_TERM) {
@@ -1562,23 +1561,27 @@ static void ccid3_hc_rx_send_feedback(struct sock *sk)
 static void ccid3_hc_rx_insert_options(struct sock *sk, struct sk_buff *skb)
 {
         const struct dccp_sock *dp = dccp_sk(sk);
+        u32 x_recv, pinv;
         struct ccid3_hc_rx_sock *hcrx = dp->dccps_hc_rx_ccid_private;
 
         if (hcrx == NULL || !(sk->sk_state == DCCP_OPEN || sk->sk_state == DCCP_PARTOPEN))
                 return;
 
-        if (hcrx->ccid3hcrx_elapsed_time != 0 && !dccp_packet_without_ack(skb))
-                dccp_insert_option_elapsed_time(sk, skb, hcrx->ccid3hcrx_elapsed_time);
-
-        if (DCCP_SKB_CB(skb)->dccpd_type != DCCP_PKT_DATA) {
-                const u32 x_recv = htonl(hcrx->ccid3hcrx_x_recv);
-                const u32 pinv   = htonl(hcrx->ccid3hcrx_pinv);
-
-                dccp_insert_option(sk, skb, TFRC_OPT_LOSS_EVENT_RATE, &pinv, sizeof(pinv));
-                dccp_insert_option(sk, skb, TFRC_OPT_RECEIVE_RATE, &x_recv, sizeof(x_recv));
-        }
-
         DCCP_SKB_CB(skb)->dccpd_ccval = hcrx->ccid3hcrx_last_counter;
+
+        if (dccp_packet_without_ack(skb))
+                return;
+                
+        if (hcrx->ccid3hcrx_elapsed_time != 0)
+                dccp_insert_option_elapsed_time(sk, skb,
+                                                hcrx->ccid3hcrx_elapsed_time);
+        dccp_insert_option_timestamp(sk, skb);
+        x_recv = htonl(hcrx->ccid3hcrx_x_recv);
+        pinv   = htonl(hcrx->ccid3hcrx_pinv);
+        dccp_insert_option(sk, skb, TFRC_OPT_LOSS_EVENT_RATE,
+                           &pinv, sizeof(pinv));
+        dccp_insert_option(sk, skb, TFRC_OPT_RECEIVE_RATE,
+                           &x_recv, sizeof(x_recv));
 }
 
 /* Weights used to calculate loss event rate */
@@ -1860,8 +1863,10 @@ static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb)
 {
         struct dccp_sock *dp = dccp_sk(sk);
         struct ccid3_hc_rx_sock *hcrx = dp->dccps_hc_rx_ccid_private;
+        const struct dccp_options_received *opt_recv;
         struct dccp_rx_hist_entry *packet;
         struct timeval now;
+        u32 now_usecs;
         u8 win_count;
         u32 p_prev;
         int ins;
@@ -1876,24 +1881,25 @@ static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb)
         BUG_ON(!(hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA ||
                  hcrx->ccid3hcrx_state == TFRC_RSTATE_DATA));
 
+        opt_recv = &dp->dccps_options_received;
+
         switch (DCCP_SKB_CB(skb)->dccpd_type) {
         case DCCP_PKT_ACK:
                 if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA)
                         return;
         case DCCP_PKT_DATAACK:
-                if (dp->dccps_options_received.dccpor_timestamp_echo == 0)
+                if (opt_recv->dccpor_timestamp_echo == 0)
                         break;
                 p_prev = hcrx->ccid3hcrx_rtt;
                 do_gettimeofday(&now);
-                /* hcrx->ccid3hcrx_rtt = now - dp->dccps_options_received.dccpor_timestamp_echo -
-                                      usecs_to_jiffies(dp->dccps_options_received.dccpor_elapsed_time * 10);
-                FIXME - I think above code is broken - have to look at options more, will also need
-                to fix pr_debug below */
+                now_usecs = now.tv_sec * USEC_PER_SEC + now.tv_usec;
+                hcrx->ccid3hcrx_rtt = now_usecs -
+                                     (opt_recv->dccpor_timestamp_echo -
+                                      opt_recv->dccpor_elapsed_time) * 10;
                 if (p_prev != hcrx->ccid3hcrx_rtt)
-                        ccid3_pr_debug("%s, sk=%p, New RTT estimate=%lu jiffies, tstamp_echo=%u, elapsed time=%u\n",
-                                       dccp_role(sk), sk, hcrx->ccid3hcrx_rtt,
-                                       dp->dccps_options_received.dccpor_timestamp_echo,
-                                       dp->dccps_options_received.dccpor_elapsed_time);
+                        ccid3_pr_debug("%s, New RTT=%luus, elapsed time=%u\n",
+                                       dccp_role(sk), hcrx->ccid3hcrx_rtt,
+                                       opt_recv->dccpor_elapsed_time);
                 break;
         case DCCP_PKT_DATA:
                 break;
@@ -1904,8 +1910,7 @@ static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb)
                 return;
         }
 
-        packet = dccp_rx_hist_entry_new(ccid3_rx_hist,
-                                        dp->dccps_options_received.dccpor_ndp,
+        packet = dccp_rx_hist_entry_new(ccid3_rx_hist, opt_recv->dccpor_ndp,
                                         skb, SLAB_ATOMIC);
         if (packet == NULL) {
                 ccid3_pr_debug("%s, sk=%p, Not enough mem to add rx packet to history (consider it lost)!",
@@ -1930,9 +1935,9 @@ static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb)
         case TFRC_RSTATE_DATA:
                 hcrx->ccid3hcrx_bytes_recv += skb->len - dccp_hdr(skb)->dccph_doff * 4;
                 if (ins == 0) {
-                        do_gettimeofday(&now);
-                        if ((now_delta(hcrx->ccid3hcrx_tstamp_last_ack)) >= hcrx->ccid3hcrx_rtt) {
-                                hcrx->ccid3hcrx_tstamp_last_ack = now;
+                        if (now_delta(hcrx->ccid3hcrx_tstamp_last_ack) >=
+                            hcrx->ccid3hcrx_rtt) {
+                                do_gettimeofday(&hcrx->ccid3hcrx_tstamp_last_ack);
                                 ccid3_hc_rx_send_feedback(sk);
                         }
                         return;
@@ -1946,8 +1951,8 @@ static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb)
         }
 
         /* Dealing with packet loss */
-        ccid3_pr_debug("%s, sk=%p(%s), skb=%p, data loss! Reacting...\n",
-                       dccp_role(sk), sk, dccp_state_name(sk->sk_state), skb);
+        ccid3_pr_debug("%s, sk=%p(%s), data loss! Reacting...\n",
+                       dccp_role(sk), sk, dccp_state_name(sk->sk_state));
 
         ccid3_hc_rx_detect_loss(sk);
         p_prev = hcrx->ccid3hcrx_p;
@@ -1985,7 +1990,11 @@ static int ccid3_hc_rx_init(struct sock *sk)
         hcrx->ccid3hcrx_state = TFRC_RSTATE_NO_DATA;
         INIT_LIST_HEAD(&hcrx->ccid3hcrx_hist);
         INIT_LIST_HEAD(&hcrx->ccid3hcrx_loss_interval_hist);
-
+        /*
+         * XXX this seems to be paranoid, need to think more about this, for
+         * now start with something different than zero. -acme
+         */
+        hcrx->ccid3hcrx_rtt = USEC_PER_SEC / 5;
         return 0;
 }