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Commit 4fded33b authored by Arnaldo Carvalho de Melo's avatar Arnaldo Carvalho de Melo Committed by David S. Miller
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[CCID3]: Calculate the RTT in the RX half connection



Using TIMESTAMP_ECHO and ELAPSED_TIME options received.

Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent d4b81ff7
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+38 −29
Original line number Diff line number Diff line
@@ -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_SKB_CB(skb)->dccpd_ccval = hcrx->ccid3hcrx_last_counter;

		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));
	}
	if (dccp_packet_without_ack(skb))
		return;
		
	DCCP_SKB_CB(skb)->dccpd_ccval = hcrx->ccid3hcrx_last_counter;
	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;
}