[CCID3]: Implement rfc3448bis changes to feedback reception
This implements the algorithm to update the allowed sending rate X upon receiving feedback packets, as described in draft rfc3448bis, 4.2/4.3. Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk> Signed-off-by: Ian McDonald <ian.mcdonald@jandi.co.nz> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -429,40 +429,46 @@ static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb)
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if (pinv == ~0U || pinv == 0) /* see RFC 4342, 8.5 */
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hctx->ccid3hctx_p = 0;
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else /* can not exceed 100% */
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hctx->ccid3hctx_p = 1000000 / pinv;
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hctx->ccid3hctx_p = scaled_div(1, pinv);
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/*
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* Validate new RTT sample and update moving average
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*/
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r_sample = dccp_sample_rtt(sk, r_sample);
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hctx->ccid3hctx_rtt = tfrc_ewma(hctx->ccid3hctx_rtt, r_sample, 9);
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/*
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* Update allowed sending rate X as per draft rfc3448bis-00, 4.2/3
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*/
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if (hctx->ccid3hctx_state == TFRC_SSTATE_NO_FBACK) {
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/*
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* Larger Initial Windows [RFC 4342, sec. 5]
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*/
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hctx->ccid3hctx_x = rfc3390_initial_rate(sk);
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hctx->ccid3hctx_t_ld = now;
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ccid3_update_send_interval(hctx);
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ccid3_pr_debug("%s(%p), s=%u, MSS=%u, "
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"R_sample=%uus, X=%u\n", dccp_role(sk),
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sk, hctx->ccid3hctx_s,
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dccp_sk(sk)->dccps_mss_cache, r_sample,
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(unsigned)(hctx->ccid3hctx_x >> 6));
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ccid3_hc_tx_set_state(sk, TFRC_SSTATE_FBACK);
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} else {
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/* Update sending rate (step 4 of [RFC 3448, 4.3]) */
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if (hctx->ccid3hctx_p > 0)
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hctx->ccid3hctx_x_calc =
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if (hctx->ccid3hctx_t_rto == 0) {
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/*
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* Initial feedback packet: Larger Initial Windows (4.2)
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*/
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hctx->ccid3hctx_x = rfc3390_initial_rate(sk);
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hctx->ccid3hctx_t_ld = now;
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ccid3_update_send_interval(hctx);
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goto done_computing_x;
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} else if (hctx->ccid3hctx_p == 0) {
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/*
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* First feedback after nofeedback timer expiry (4.3)
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*/
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goto done_computing_x;
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}
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}
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/* Update sending rate (step 4 of [RFC 3448, 4.3]) */
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if (hctx->ccid3hctx_p > 0)
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hctx->ccid3hctx_x_calc =
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tfrc_calc_x(hctx->ccid3hctx_s,
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hctx->ccid3hctx_rtt,
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hctx->ccid3hctx_p);
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ccid3_hc_tx_update_x(sk, &now);
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ccid3_hc_tx_update_x(sk, &now);
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ccid3_pr_debug("%s(%p), RTT=%uus (sample=%uus), s=%u, "
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done_computing_x:
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ccid3_pr_debug("%s(%p), RTT=%uus (sample=%uus), s=%u, "
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"p=%u, X_calc=%u, X_recv=%u, X=%u\n",
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dccp_role(sk),
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sk, hctx->ccid3hctx_rtt, r_sample,
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@ -470,7 +476,6 @@ static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb)
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hctx->ccid3hctx_x_calc,
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(unsigned)(hctx->ccid3hctx_x_recv >> 6),
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(unsigned)(hctx->ccid3hctx_x >> 6));
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}
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/* unschedule no feedback timer */
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sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer);
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