From: Gerrit Renker Date: Tue, 28 Nov 2006 20:34:34 +0000 (-0200) Subject: [DCCP] ccid3: Set NoFeedback Timeout according to RFC 3448 X-Git-Tag: MMI-PSA29.97-13-9~44978^2~47^2~228 X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=2a1fda6f6c01d7ac195c040f14edcf9f64a5451e;p=GitHub%2FMotorolaMobilityLLC%2Fkernel-slsi.git [DCCP] ccid3: Set NoFeedback Timeout according to RFC 3448 This corrects the setting of the nofeedback timer with regard to RFC 3448 - previously it was not set to max(4*R, 2*s/X) as specified. Using the maximum of 1 second as upper bound (as it was done before) can have detrimental effects, especially if R is small. Signed-off-by: Ian McDonald Signed-off-by: Gerrit Renker Signed-off-by: Arnaldo Carvalho de Melo --- diff --git a/net/dccp/ccids/ccid3.c b/net/dccp/ccids/ccid3.c index f0ed67c84a55..577fd0ef84e5 100644 --- a/net/dccp/ccids/ccid3.c +++ b/net/dccp/ccids/ccid3.c @@ -163,7 +163,7 @@ static void ccid3_hc_tx_no_feedback_timer(unsigned long data) { struct sock *sk = (struct sock *)data; struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk); - unsigned long next_tmout = USEC_PER_SEC / 5; + unsigned long t_nfb = USEC_PER_SEC / 5; bh_lock_sock(sk); if (sock_owned_by_user(sk)) { @@ -191,7 +191,7 @@ static void ccid3_hc_tx_no_feedback_timer(unsigned long data) hctx->ccid3hctx_x); /* The value of R is still undefined and so we can not recompute * the timout value. Keep initial value as per [RFC 4342, 5]. */ - next_tmout = TFRC_INITIAL_TIMEOUT; + t_nfb = TFRC_INITIAL_TIMEOUT; ccid3_update_send_time(hctx); break; case TFRC_SSTATE_FBACK: @@ -228,10 +228,9 @@ static void ccid3_hc_tx_no_feedback_timer(unsigned long data) } /* * Schedule no feedback timer to expire in - * max(4 * t_RTO, 2 * s/X) = max(4 * t_RTO, 2 * t_ipi) - * XXX This is non-standard, RFC 3448, 4.3 uses 4 * R + * max(4 * R, 2 * s/X) = max(4 * R, 2 * t_ipi) */ - next_tmout = max(hctx->ccid3hctx_t_rto, 2*hctx->ccid3hctx_t_ipi); + t_nfb = max(4 * hctx->ccid3hctx_rtt, 2 * hctx->ccid3hctx_t_ipi); break; case TFRC_SSTATE_NO_SENT: DCCP_BUG("Illegal %s state NO_SENT, sk=%p", dccp_role(sk), sk); @@ -244,7 +243,7 @@ static void ccid3_hc_tx_no_feedback_timer(unsigned long data) restart_timer: sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, - jiffies + usecs_to_jiffies(next_tmout)); + jiffies + usecs_to_jiffies(t_nfb)); out: bh_unlock_sock(sk); sock_put(sk); @@ -396,7 +395,7 @@ static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb) struct ccid3_options_received *opt_recv; struct dccp_tx_hist_entry *packet; struct timeval now; - unsigned long next_tmout; + unsigned long t_nfb; u32 t_elapsed; u32 pinv; u32 x_recv; @@ -498,18 +497,17 @@ static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb) USEC_PER_SEC ); /* * Schedule no feedback timer to expire in - * max(4 * t_RTO, 2 * s/X) = max(4 * t_RTO, 2 * t_ipi) - * XXX This is non-standard, RFC 3448, 4.3 uses 4 * R + * max(4 * R, 2 * s/X) = max(4 * R, 2 * t_ipi) */ - next_tmout = max(hctx->ccid3hctx_t_rto, 2*hctx->ccid3hctx_t_ipi); + t_nfb = max(4 * hctx->ccid3hctx_rtt, 2 * hctx->ccid3hctx_t_ipi); ccid3_pr_debug("%s, sk=%p, Scheduled no feedback timer to " "expire in %lu jiffies (%luus)\n", dccp_role(sk), sk, - usecs_to_jiffies(next_tmout), next_tmout); + usecs_to_jiffies(t_nfb), t_nfb); sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, - jiffies + usecs_to_jiffies(next_tmout)); + jiffies + usecs_to_jiffies(t_nfb)); /* set idle flag */ hctx->ccid3hctx_idle = 1;