static void ccid3_hc_tx_set_state(struct sock *sk,
enum ccid3_hc_tx_states state)
{
- struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
- enum ccid3_hc_tx_states oldstate = hctx->tx_state;
+ struct ccid3_hc_tx_sock *hc = ccid3_hc_tx_sk(sk);
+ enum ccid3_hc_tx_states oldstate = hc->tx_state;
ccid3_pr_debug("%s(%p) %-8.8s -> %s\n",
dccp_role(sk), sk, ccid3_tx_state_name(oldstate),
ccid3_tx_state_name(state));
WARN_ON(state == oldstate);
- hctx->tx_state = state;
+ hc->tx_state = state;
}
/*
*/
static inline u64 rfc3390_initial_rate(struct sock *sk)
{
- const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
- const __u32 w_init = clamp_t(__u32, 4380U, 2 * hctx->tx_s, 4 * hctx->tx_s);
+ const struct ccid3_hc_tx_sock *hc = ccid3_hc_tx_sk(sk);
+ const __u32 w_init = clamp_t(__u32, 4380U, 2 * hc->tx_s, 4 * hc->tx_s);
- return scaled_div(w_init << 6, hctx->tx_rtt);
+ return scaled_div(w_init << 6, hc->tx_rtt);
}
/*
* Recalculate t_ipi and delta (should be called whenever X changes)
*/
-static void ccid3_update_send_interval(struct ccid3_hc_tx_sock *hctx)
+static void ccid3_update_send_interval(struct ccid3_hc_tx_sock *hc)
{
/* Calculate new t_ipi = s / X_inst (X_inst is in 64 * bytes/second) */
- hctx->tx_t_ipi = scaled_div32(((u64)hctx->tx_s) << 6, hctx->tx_x);
+ hc->tx_t_ipi = scaled_div32(((u64)hc->tx_s) << 6, hc->tx_x);
/* Calculate new delta by delta = min(t_ipi / 2, t_gran / 2) */
- hctx->tx_delta = min_t(u32, hctx->tx_t_ipi / 2, TFRC_OPSYS_HALF_TIME_GRAN);
+ hc->tx_delta = min_t(u32, hc->tx_t_ipi / 2, TFRC_OPSYS_HALF_TIME_GRAN);
- ccid3_pr_debug("t_ipi=%u, delta=%u, s=%u, X=%u\n", hctx->tx_t_ipi,
- hctx->tx_delta, hctx->tx_s, (unsigned)(hctx->tx_x >> 6));
+ ccid3_pr_debug("t_ipi=%u, delta=%u, s=%u, X=%u\n", hc->tx_t_ipi,
+ hc->tx_delta, hc->tx_s, (unsigned)(hc->tx_x >> 6));
}
-static u32 ccid3_hc_tx_idle_rtt(struct ccid3_hc_tx_sock *hctx, ktime_t now)
+static u32 ccid3_hc_tx_idle_rtt(struct ccid3_hc_tx_sock *hc, ktime_t now)
{
- u32 delta = ktime_us_delta(now, hctx->tx_t_last_win_count);
+ u32 delta = ktime_us_delta(now, hc->tx_t_last_win_count);
- return delta / hctx->tx_rtt;
+ return delta / hc->tx_rtt;
}
/**
*/
static void ccid3_hc_tx_update_x(struct sock *sk, ktime_t *stamp)
{
- struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
- __u64 min_rate = 2 * hctx->tx_x_recv;
- const __u64 old_x = hctx->tx_x;
+ struct ccid3_hc_tx_sock *hc = ccid3_hc_tx_sk(sk);
+ __u64 min_rate = 2 * hc->tx_x_recv;
+ const __u64 old_x = hc->tx_x;
ktime_t now = stamp ? *stamp : ktime_get_real();
/*
* a sender is idle if it has not sent anything over a 2-RTT-period.
* For consistency with X and X_recv, min_rate is also scaled by 2^6.
*/
- if (ccid3_hc_tx_idle_rtt(hctx, now) >= 2) {
+ if (ccid3_hc_tx_idle_rtt(hc, now) >= 2) {
min_rate = rfc3390_initial_rate(sk);
- min_rate = max(min_rate, 2 * hctx->tx_x_recv);
+ min_rate = max(min_rate, 2 * hc->tx_x_recv);
}
- if (hctx->tx_p > 0) {
+ if (hc->tx_p > 0) {
- hctx->tx_x = min(((__u64)hctx->tx_x_calc) << 6, min_rate);
- hctx->tx_x = max(hctx->tx_x, (((__u64)hctx->tx_s) << 6) / TFRC_T_MBI);
+ hc->tx_x = min(((__u64)hc->tx_x_calc) << 6, min_rate);
+ hc->tx_x = max(hc->tx_x, (((__u64)hc->tx_s) << 6) / TFRC_T_MBI);
- } else if (ktime_us_delta(now, hctx->tx_t_ld) - (s64)hctx->tx_rtt >= 0) {
+ } else if (ktime_us_delta(now, hc->tx_t_ld) - (s64)hc->tx_rtt >= 0) {
- hctx->tx_x = min(2 * hctx->tx_x, min_rate);
- hctx->tx_x = max(hctx->tx_x, scaled_div(((__u64)hctx->tx_s) << 6,
- hctx->tx_rtt));
- hctx->tx_t_ld = now;
+ hc->tx_x = min(2 * hc->tx_x, min_rate);
+ hc->tx_x = max(hc->tx_x,
+ scaled_div(((__u64)hc->tx_s) << 6, hc->tx_rtt));
+ hc->tx_t_ld = now;
}
- if (hctx->tx_x != old_x) {
+ if (hc->tx_x != old_x) {
ccid3_pr_debug("X_prev=%u, X_now=%u, X_calc=%u, "
"X_recv=%u\n", (unsigned)(old_x >> 6),
- (unsigned)(hctx->tx_x >> 6), hctx->tx_x_calc,
- (unsigned)(hctx->tx_x_recv >> 6));
+ (unsigned)(hc->tx_x >> 6), hc->tx_x_calc,
+ (unsigned)(hc->tx_x_recv >> 6));
- ccid3_update_send_interval(hctx);
+ ccid3_update_send_interval(hc);
}
}
* Track the mean packet size `s' (cf. RFC 4342, 5.3 and RFC 3448, 4.1)
* @len: DCCP packet payload size in bytes
*/
-static inline void ccid3_hc_tx_update_s(struct ccid3_hc_tx_sock *hctx, int len)
+static inline void ccid3_hc_tx_update_s(struct ccid3_hc_tx_sock *hc, int len)
{
- const u16 old_s = hctx->tx_s;
+ const u16 old_s = hc->tx_s;
- hctx->tx_s = tfrc_ewma(hctx->tx_s, len, 9);
+ hc->tx_s = tfrc_ewma(hc->tx_s, len, 9);
- if (hctx->tx_s != old_s)
- ccid3_update_send_interval(hctx);
+ if (hc->tx_s != old_s)
+ ccid3_update_send_interval(hc);
}
/*
* Update Window Counter using the algorithm from [RFC 4342, 8.1].
* As elsewhere, RTT > 0 is assumed by using dccp_sample_rtt().
*/
-static inline void ccid3_hc_tx_update_win_count(struct ccid3_hc_tx_sock *hctx,
+static inline void ccid3_hc_tx_update_win_count(struct ccid3_hc_tx_sock *hc,
ktime_t now)
{
- u32 delta = ktime_us_delta(now, hctx->tx_t_last_win_count),
- quarter_rtts = (4 * delta) / hctx->tx_rtt;
+ u32 delta = ktime_us_delta(now, hc->tx_t_last_win_count),
+ quarter_rtts = (4 * delta) / hc->tx_rtt;
if (quarter_rtts > 0) {
- hctx->tx_t_last_win_count = now;
- hctx->tx_last_win_count += min(quarter_rtts, 5U);
- hctx->tx_last_win_count &= 0xF; /* mod 16 */
+ hc->tx_t_last_win_count = now;
+ hc->tx_last_win_count += min(quarter_rtts, 5U);
+ hc->tx_last_win_count &= 0xF; /* mod 16 */
}
}
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);
+ struct ccid3_hc_tx_sock *hc = ccid3_hc_tx_sk(sk);
unsigned long t_nfb = USEC_PER_SEC / 5;
bh_lock_sock(sk);
}
ccid3_pr_debug("%s(%p, state=%s) - entry \n", dccp_role(sk), sk,
- ccid3_tx_state_name(hctx->tx_state));
+ ccid3_tx_state_name(hc->tx_state));
- if (hctx->tx_state == TFRC_SSTATE_FBACK)
+ if (hc->tx_state == TFRC_SSTATE_FBACK)
ccid3_hc_tx_set_state(sk, TFRC_SSTATE_NO_FBACK);
- else if (hctx->tx_state != TFRC_SSTATE_NO_FBACK)
+ else if (hc->tx_state != TFRC_SSTATE_NO_FBACK)
goto out;
/*
* Determine new allowed sending rate X as per draft rfc3448bis-00, 4.4
*/
- if (hctx->tx_t_rto == 0 || /* no feedback received yet */
- hctx->tx_p == 0) {
+ if (hc->tx_t_rto == 0 || /* no feedback received yet */
+ hc->tx_p == 0) {
/* halve send rate directly */
- hctx->tx_x = max(hctx->tx_x / 2,
- (((__u64)hctx->tx_s) << 6) / TFRC_T_MBI);
- ccid3_update_send_interval(hctx);
+ hc->tx_x = max(hc->tx_x / 2,
+ (((__u64)hc->tx_s) << 6) / TFRC_T_MBI);
+ ccid3_update_send_interval(hc);
} else {
/*
* Modify the cached value of X_recv
*
* Note that X_recv is scaled by 2^6 while X_calc is not
*/
- BUG_ON(hctx->tx_p && !hctx->tx_x_calc);
+ BUG_ON(hc->tx_p && !hc->tx_x_calc);
- if (hctx->tx_x_calc > (hctx->tx_x_recv >> 5))
- hctx->tx_x_recv =
- max(hctx->tx_x_recv / 2,
- (((__u64)hctx->tx_s) << 6) /
- (2 * TFRC_T_MBI));
+ if (hc->tx_x_calc > (hc->tx_x_recv >> 5))
+ hc->tx_x_recv =
+ max(hc->tx_x_recv / 2,
+ (((__u64)hc->tx_s) << 6) / (2*TFRC_T_MBI));
else {
- hctx->tx_x_recv = hctx->tx_x_calc;
- hctx->tx_x_recv <<= 4;
+ hc->tx_x_recv = hc->tx_x_calc;
+ hc->tx_x_recv <<= 4;
}
ccid3_hc_tx_update_x(sk, NULL);
}
ccid3_pr_debug("Reduced X to %llu/64 bytes/sec\n",
- (unsigned long long)hctx->tx_x);
+ (unsigned long long)hc->tx_x);
/*
* Set new timeout for the nofeedback timer.
* See comments in packet_recv() regarding the value of t_RTO.
*/
- if (unlikely(hctx->tx_t_rto == 0)) /* no feedback yet */
+ if (unlikely(hc->tx_t_rto == 0)) /* no feedback yet */
t_nfb = TFRC_INITIAL_TIMEOUT;
else
- t_nfb = max(hctx->tx_t_rto, 2 * hctx->tx_t_ipi);
+ t_nfb = max(hc->tx_t_rto, 2 * hc->tx_t_ipi);
restart_timer:
- sk_reset_timer(sk, &hctx->tx_no_feedback_timer,
+ sk_reset_timer(sk, &hc->tx_no_feedback_timer,
jiffies + usecs_to_jiffies(t_nfb));
out:
bh_unlock_sock(sk);
static int ccid3_hc_tx_send_packet(struct sock *sk, struct sk_buff *skb)
{
struct dccp_sock *dp = dccp_sk(sk);
- struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
+ struct ccid3_hc_tx_sock *hc = ccid3_hc_tx_sk(sk);
ktime_t now = ktime_get_real();
s64 delay;
if (unlikely(skb->len == 0))
return -EBADMSG;
- switch (hctx->tx_state) {
+ switch (hc->tx_state) {
case TFRC_SSTATE_NO_SENT:
- sk_reset_timer(sk, &hctx->tx_no_feedback_timer, (jiffies +
- usecs_to_jiffies(TFRC_INITIAL_TIMEOUT)));
- hctx->tx_last_win_count = 0;
- hctx->tx_t_last_win_count = now;
+ sk_reset_timer(sk, &hc->tx_no_feedback_timer, (jiffies +
+ usecs_to_jiffies(TFRC_INITIAL_TIMEOUT)));
+ hc->tx_last_win_count = 0;
+ hc->tx_t_last_win_count = now;
/* Set t_0 for initial packet */
- hctx->tx_t_nom = now;
+ hc->tx_t_nom = now;
- hctx->tx_s = skb->len;
+ hc->tx_s = skb->len;
/*
* Use initial RTT sample when available: recommended by erratum
*/
if (dp->dccps_syn_rtt) {
ccid3_pr_debug("SYN RTT = %uus\n", dp->dccps_syn_rtt);
- hctx->tx_rtt = dp->dccps_syn_rtt;
- hctx->tx_x = rfc3390_initial_rate(sk);
- hctx->tx_t_ld = now;
+ hc->tx_rtt = dp->dccps_syn_rtt;
+ hc->tx_x = rfc3390_initial_rate(sk);
+ hc->tx_t_ld = now;
} else {
/*
* Sender does not have RTT sample:
* is needed in several parts (e.g. window counter);
* - set sending rate X_pps = 1pps as per RFC 3448, 4.2.
*/
- hctx->tx_rtt = DCCP_FALLBACK_RTT;
- hctx->tx_x = hctx->tx_s;
- hctx->tx_x <<= 6;
+ hc->tx_rtt = DCCP_FALLBACK_RTT;
+ hc->tx_x = hc->tx_s;
+ hc->tx_x <<= 6;
}
- ccid3_update_send_interval(hctx);
+ ccid3_update_send_interval(hc);
ccid3_hc_tx_set_state(sk, TFRC_SSTATE_NO_FBACK);
break;
case TFRC_SSTATE_NO_FBACK:
case TFRC_SSTATE_FBACK:
- delay = ktime_us_delta(hctx->tx_t_nom, now);
+ delay = ktime_us_delta(hc->tx_t_nom, now);
ccid3_pr_debug("delay=%ld\n", (long)delay);
/*
* Scheduling of packet transmissions [RFC 3448, 4.6]
* else
* // send the packet in (t_nom - t_now) milliseconds.
*/
- if (delay - (s64)hctx->tx_delta >= 1000)
+ if (delay - (s64)hc->tx_delta >= 1000)
return (u32)delay / 1000L;
- ccid3_hc_tx_update_win_count(hctx, now);
+ ccid3_hc_tx_update_win_count(hc, now);
break;
case TFRC_SSTATE_TERM:
DCCP_BUG("%s(%p) - Illegal state TERM", dccp_role(sk), sk);
/* prepare to send now (add options etc.) */
dp->dccps_hc_tx_insert_options = 1;
- DCCP_SKB_CB(skb)->dccpd_ccval = hctx->tx_last_win_count;
+ DCCP_SKB_CB(skb)->dccpd_ccval = hc->tx_last_win_count;
/* set the nominal send time for the next following packet */
- hctx->tx_t_nom = ktime_add_us(hctx->tx_t_nom, hctx->tx_t_ipi);
+ hc->tx_t_nom = ktime_add_us(hc->tx_t_nom, hc->tx_t_ipi);
return 0;
}
static void ccid3_hc_tx_packet_sent(struct sock *sk, int more,
unsigned int len)
{
- struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
+ struct ccid3_hc_tx_sock *hc = ccid3_hc_tx_sk(sk);
- ccid3_hc_tx_update_s(hctx, len);
+ ccid3_hc_tx_update_s(hc, len);
- if (tfrc_tx_hist_add(&hctx->tx_hist, dccp_sk(sk)->dccps_gss))
+ if (tfrc_tx_hist_add(&hc->tx_hist, dccp_sk(sk)->dccps_gss))
DCCP_CRIT("packet history - out of memory!");
}
static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb)
{
- struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
+ struct ccid3_hc_tx_sock *hc = ccid3_hc_tx_sk(sk);
struct ccid3_options_received *opt_recv;
ktime_t now;
unsigned long t_nfb;
DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_DATAACK))
return;
/* ... and only in the established state */
- if (hctx->tx_state != TFRC_SSTATE_FBACK &&
- hctx->tx_state != TFRC_SSTATE_NO_FBACK)
+ if (hc->tx_state != TFRC_SSTATE_FBACK &&
+ hc->tx_state != TFRC_SSTATE_NO_FBACK)
return;
- opt_recv = &hctx->tx_options_received;
+ opt_recv = &hc->tx_options_received;
now = ktime_get_real();
/* Estimate RTT from history if ACK number is valid */
- r_sample = tfrc_tx_hist_rtt(hctx->tx_hist,
+ r_sample = tfrc_tx_hist_rtt(hc->tx_hist,
DCCP_SKB_CB(skb)->dccpd_ack_seq, now);
if (r_sample == 0) {
DCCP_WARN("%s(%p): %s with bogus ACK-%llu\n", dccp_role(sk), sk,
}
/* Update receive rate in units of 64 * bytes/second */
- hctx->tx_x_recv = opt_recv->ccid3or_receive_rate;
- hctx->tx_x_recv <<= 6;
+ 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 == ~0U || pinv == 0) /* see RFC 4342, 8.5 */
- hctx->tx_p = 0;
+ hc->tx_p = 0;
else /* can not exceed 100% */
- hctx->tx_p = scaled_div(1, pinv);
+ hc->tx_p = scaled_div(1, pinv);
/*
* Validate new RTT sample and update moving average
*/
r_sample = dccp_sample_rtt(sk, r_sample);
- hctx->tx_rtt = tfrc_ewma(hctx->tx_rtt, r_sample, 9);
+ hc->tx_rtt = tfrc_ewma(hc->tx_rtt, r_sample, 9);
/*
* Update allowed sending rate X as per draft rfc3448bis-00, 4.2/3
*/
- if (hctx->tx_state == TFRC_SSTATE_NO_FBACK) {
+ if (hc->tx_state == TFRC_SSTATE_NO_FBACK) {
ccid3_hc_tx_set_state(sk, TFRC_SSTATE_FBACK);
- if (hctx->tx_t_rto == 0) {
+ if (hc->tx_t_rto == 0) {
/*
* Initial feedback packet: Larger Initial Windows (4.2)
*/
- hctx->tx_x = rfc3390_initial_rate(sk);
- hctx->tx_t_ld = now;
+ hc->tx_x = rfc3390_initial_rate(sk);
+ hc->tx_t_ld = now;
- ccid3_update_send_interval(hctx);
+ ccid3_update_send_interval(hc);
goto done_computing_x;
- } else if (hctx->tx_p == 0) {
+ } else if (hc->tx_p == 0) {
/*
* First feedback after nofeedback timer expiry (4.3)
*/
}
/* Update sending rate (step 4 of [RFC 3448, 4.3]) */
- if (hctx->tx_p > 0)
- hctx->tx_x_calc = tfrc_calc_x(hctx->tx_s, hctx->tx_rtt, hctx->tx_p);
+ if (hc->tx_p > 0)
+ hc->tx_x_calc = tfrc_calc_x(hc->tx_s, hc->tx_rtt, hc->tx_p);
ccid3_hc_tx_update_x(sk, &now);
done_computing_x:
ccid3_pr_debug("%s(%p), RTT=%uus (sample=%uus), s=%u, "
"p=%u, X_calc=%u, X_recv=%u, X=%u\n",
- dccp_role(sk), sk, hctx->tx_rtt, r_sample,
- hctx->tx_s, hctx->tx_p, hctx->tx_x_calc,
- (unsigned)(hctx->tx_x_recv >> 6),
- (unsigned)(hctx->tx_x >> 6));
+ dccp_role(sk), sk, hc->tx_rtt, r_sample,
+ hc->tx_s, hc->tx_p, hc->tx_x_calc,
+ (unsigned)(hc->tx_x_recv >> 6),
+ (unsigned)(hc->tx_x >> 6));
/* unschedule no feedback timer */
- sk_stop_timer(sk, &hctx->tx_no_feedback_timer);
+ sk_stop_timer(sk, &hc->tx_no_feedback_timer);
/*
* As we have calculated new ipi, delta, t_nom it is possible
* This can help avoid triggering the nofeedback timer too
* often ('spinning') on LANs with small RTTs.
*/
- hctx->tx_t_rto = max_t(u32, 4 * hctx->tx_rtt, (CONFIG_IP_DCCP_CCID3_RTO *
+ hc->tx_t_rto = max_t(u32, 4 * hc->tx_rtt, (CONFIG_IP_DCCP_CCID3_RTO *
(USEC_PER_SEC / 1000)));
/*
* Schedule no feedback timer to expire in
* max(t_RTO, 2 * s/X) = max(t_RTO, 2 * t_ipi)
*/
- t_nfb = max(hctx->tx_t_rto, 2 * hctx->tx_t_ipi);
+ t_nfb = max(hc->tx_t_rto, 2 * hc->tx_t_ipi);
ccid3_pr_debug("%s(%p), Scheduled no feedback timer to "
"expire in %lu jiffies (%luus)\n",
dccp_role(sk), sk, usecs_to_jiffies(t_nfb), t_nfb);
- sk_reset_timer(sk, &hctx->tx_no_feedback_timer,
+ sk_reset_timer(sk, &hc->tx_no_feedback_timer,
jiffies + usecs_to_jiffies(t_nfb));
}
{
int rc = 0;
const struct dccp_sock *dp = dccp_sk(sk);
- struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
+ struct ccid3_hc_tx_sock *hc = ccid3_hc_tx_sk(sk);
struct ccid3_options_received *opt_recv;
__be32 opt_val;
- opt_recv = &hctx->tx_options_received;
+ opt_recv = &hc->tx_options_received;
if (opt_recv->ccid3or_seqno != dp->dccps_gsr) {
opt_recv->ccid3or_seqno = dp->dccps_gsr;
static int ccid3_hc_tx_init(struct ccid *ccid, struct sock *sk)
{
- struct ccid3_hc_tx_sock *hctx = ccid_priv(ccid);
+ struct ccid3_hc_tx_sock *hc = ccid_priv(ccid);
- hctx->tx_state = TFRC_SSTATE_NO_SENT;
- hctx->tx_hist = NULL;
- setup_timer(&hctx->tx_no_feedback_timer,
+ hc->tx_state = TFRC_SSTATE_NO_SENT;
+ hc->tx_hist = NULL;
+ setup_timer(&hc->tx_no_feedback_timer,
ccid3_hc_tx_no_feedback_timer, (unsigned long)sk);
return 0;
}
static void ccid3_hc_tx_exit(struct sock *sk)
{
- struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
+ struct ccid3_hc_tx_sock *hc = ccid3_hc_tx_sk(sk);
ccid3_hc_tx_set_state(sk, TFRC_SSTATE_TERM);
- sk_stop_timer(sk, &hctx->tx_no_feedback_timer);
+ sk_stop_timer(sk, &hc->tx_no_feedback_timer);
- tfrc_tx_hist_purge(&hctx->tx_hist);
+ tfrc_tx_hist_purge(&hc->tx_hist);
}
static void ccid3_hc_tx_get_info(struct sock *sk, struct tcp_info *info)
{
- struct ccid3_hc_tx_sock *hctx;
+ struct ccid3_hc_tx_sock *hc;
/* Listen socks doesn't have a private CCID block */
if (sk->sk_state == DCCP_LISTEN)
return;
- hctx = ccid3_hc_tx_sk(sk);
- info->tcpi_rto = hctx->tx_t_rto;
- info->tcpi_rtt = hctx->tx_rtt;
+ hc = ccid3_hc_tx_sk(sk);
+ info->tcpi_rto = hc->tx_t_rto;
+ info->tcpi_rtt = hc->tx_rtt;
}
static int ccid3_hc_tx_getsockopt(struct sock *sk, const int optname, int len,
u32 __user *optval, int __user *optlen)
{
- const struct ccid3_hc_tx_sock *hctx;
+ const struct ccid3_hc_tx_sock *hc;
const void *val;
/* Listen socks doesn't have a private CCID block */
if (sk->sk_state == DCCP_LISTEN)
return -EINVAL;
- hctx = ccid3_hc_tx_sk(sk);
+ hc = ccid3_hc_tx_sk(sk);
switch (optname) {
case DCCP_SOCKOPT_CCID_TX_INFO:
- if (len < sizeof(hctx->tx_tfrc))
+ if (len < sizeof(hc->tx_tfrc))
return -EINVAL;
- len = sizeof(hctx->tx_tfrc);
- val = &hctx->tx_tfrc;
+ len = sizeof(hc->tx_tfrc);
+ val = &hc->tx_tfrc;
break;
default:
return -ENOPROTOOPT;
static void ccid3_hc_rx_set_state(struct sock *sk,
enum ccid3_hc_rx_states state)
{
- struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk);
- enum ccid3_hc_rx_states oldstate = hcrx->rx_state;
+ struct ccid3_hc_rx_sock *hc = ccid3_hc_rx_sk(sk);
+ enum ccid3_hc_rx_states oldstate = hc->rx_state;
ccid3_pr_debug("%s(%p) %-8.8s -> %s\n",
dccp_role(sk), sk, ccid3_rx_state_name(oldstate),
ccid3_rx_state_name(state));
WARN_ON(state == oldstate);
- hcrx->rx_state = state;
+ hc->rx_state = state;
}
static void ccid3_hc_rx_send_feedback(struct sock *sk,
const struct sk_buff *skb,
enum ccid3_fback_type fbtype)
{
- struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk);
+ struct ccid3_hc_rx_sock *hc = ccid3_hc_rx_sk(sk);
struct dccp_sock *dp = dccp_sk(sk);
ktime_t now;
s64 delta = 0;
- if (unlikely(hcrx->rx_state == TFRC_RSTATE_TERM))
+ if (unlikely(hc->rx_state == TFRC_RSTATE_TERM))
return;
now = ktime_get_real();
switch (fbtype) {
case CCID3_FBACK_INITIAL:
- hcrx->rx_x_recv = 0;
- hcrx->rx_pinv = ~0U; /* see RFC 4342, 8.5 */
+ hc->rx_x_recv = 0;
+ hc->rx_pinv = ~0U; /* see RFC 4342, 8.5 */
break;
case CCID3_FBACK_PARAM_CHANGE:
/*
* the number of bytes since last feedback.
* This is a safe fallback, since X is bounded above by X_calc.
*/
- if (hcrx->rx_x_recv > 0)
+ if (hc->rx_x_recv > 0)
break;
/* fall through */
case CCID3_FBACK_PERIODIC:
- delta = ktime_us_delta(now, hcrx->rx_tstamp_last_feedback);
+ delta = ktime_us_delta(now, hc->rx_tstamp_last_feedback);
if (delta <= 0)
DCCP_BUG("delta (%ld) <= 0", (long)delta);
else
- hcrx->rx_x_recv = scaled_div32(hcrx->rx_bytes_recv, delta);
+ hc->rx_x_recv = scaled_div32(hc->rx_bytes_recv, delta);
break;
default:
return;
}
ccid3_pr_debug("Interval %ldusec, X_recv=%u, 1/p=%u\n", (long)delta,
- hcrx->rx_x_recv, hcrx->rx_pinv);
+ hc->rx_x_recv, hc->rx_pinv);
- hcrx->rx_tstamp_last_feedback = now;
- hcrx->rx_last_counter = dccp_hdr(skb)->dccph_ccval;
- hcrx->rx_bytes_recv = 0;
+ hc->rx_tstamp_last_feedback = now;
+ hc->rx_last_counter = dccp_hdr(skb)->dccph_ccval;
+ hc->rx_bytes_recv = 0;
dp->dccps_hc_rx_insert_options = 1;
dccp_send_ack(sk);
static int ccid3_hc_rx_insert_options(struct sock *sk, struct sk_buff *skb)
{
- const struct ccid3_hc_rx_sock *hcrx;
+ const struct ccid3_hc_rx_sock *hc;
__be32 x_recv, pinv;
if (!(sk->sk_state == DCCP_OPEN || sk->sk_state == DCCP_PARTOPEN))
return 0;
- hcrx = ccid3_hc_rx_sk(sk);
+ hc = ccid3_hc_rx_sk(sk);
if (dccp_packet_without_ack(skb))
return 0;
- x_recv = htonl(hcrx->rx_x_recv);
- pinv = htonl(hcrx->rx_pinv);
+ x_recv = htonl(hc->rx_x_recv);
+ pinv = htonl(hc->rx_pinv);
if (dccp_insert_option(sk, skb, TFRC_OPT_LOSS_EVENT_RATE,
&pinv, sizeof(pinv)) ||
*/
static u32 ccid3_first_li(struct sock *sk)
{
- struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk);
+ struct ccid3_hc_rx_sock *hc = ccid3_hc_rx_sk(sk);
u32 x_recv, p, delta;
u64 fval;
- if (hcrx->rx_rtt == 0) {
+ if (hc->rx_rtt == 0) {
DCCP_WARN("No RTT estimate available, using fallback RTT\n");
- hcrx->rx_rtt = DCCP_FALLBACK_RTT;
+ hc->rx_rtt = DCCP_FALLBACK_RTT;
}
- delta = ktime_to_us(net_timedelta(hcrx->rx_tstamp_last_feedback));
- x_recv = scaled_div32(hcrx->rx_bytes_recv, delta);
+ delta = ktime_to_us(net_timedelta(hc->rx_tstamp_last_feedback));
+ x_recv = scaled_div32(hc->rx_bytes_recv, delta);
if (x_recv == 0) { /* would also trigger divide-by-zero */
DCCP_WARN("X_recv==0\n");
- if ((x_recv = hcrx->rx_x_recv) == 0) {
+ if ((x_recv = hc->rx_x_recv) == 0) {
DCCP_BUG("stored value of X_recv is zero");
return ~0U;
}
}
- fval = scaled_div(hcrx->rx_s, hcrx->rx_rtt);
+ fval = scaled_div(hc->rx_s, hc->rx_rtt);
fval = scaled_div32(fval, x_recv);
p = tfrc_calc_x_reverse_lookup(fval);
static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb)
{
- struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk);
+ struct ccid3_hc_rx_sock *hc = ccid3_hc_rx_sk(sk);
enum ccid3_fback_type do_feedback = CCID3_FBACK_NONE;
const u64 ndp = dccp_sk(sk)->dccps_options_received.dccpor_ndp;
const bool is_data_packet = dccp_data_packet(skb);
- if (unlikely(hcrx->rx_state == TFRC_RSTATE_NO_DATA)) {
+ if (unlikely(hc->rx_state == TFRC_RSTATE_NO_DATA)) {
if (is_data_packet) {
const u32 payload = skb->len - dccp_hdr(skb)->dccph_doff * 4;
do_feedback = CCID3_FBACK_INITIAL;
ccid3_hc_rx_set_state(sk, TFRC_RSTATE_DATA);
- hcrx->rx_s = payload;
+ hc->rx_s = payload;
/*
* Not necessary to update rx_bytes_recv here,
* since X_recv = 0 for the first feedback packet (cf.
goto update_records;
}
- if (tfrc_rx_hist_duplicate(&hcrx->rx_hist, skb))
+ if (tfrc_rx_hist_duplicate(&hc->rx_hist, skb))
return; /* done receiving */
if (is_data_packet) {
/*
* Update moving-average of s and the sum of received payload bytes
*/
- hcrx->rx_s = tfrc_ewma(hcrx->rx_s, payload, 9);
- hcrx->rx_bytes_recv += payload;
+ hc->rx_s = tfrc_ewma(hc->rx_s, payload, 9);
+ hc->rx_bytes_recv += payload;
}
/*
* Perform loss detection and handle pending losses
*/
- if (tfrc_rx_handle_loss(&hcrx->rx_hist, &hcrx->rx_li_hist,
+ if (tfrc_rx_handle_loss(&hc->rx_hist, &hc->rx_li_hist,
skb, ndp, ccid3_first_li, sk)) {
do_feedback = CCID3_FBACK_PARAM_CHANGE;
goto done_receiving;
}
- if (tfrc_rx_hist_loss_pending(&hcrx->rx_hist))
+ if (tfrc_rx_hist_loss_pending(&hc->rx_hist))
return; /* done receiving */
/*
if (unlikely(!is_data_packet))
goto update_records;
- if (!tfrc_lh_is_initialised(&hcrx->rx_li_hist)) {
- const u32 sample = tfrc_rx_hist_sample_rtt(&hcrx->rx_hist, skb);
+ if (!tfrc_lh_is_initialised(&hc->rx_li_hist)) {
+ const u32 sample = tfrc_rx_hist_sample_rtt(&hc->rx_hist, skb);
/*
* Empty loss history: no loss so far, hence p stays 0.
* Sample RTT values, since an RTT estimate is required for the
* computation of p when the first loss occurs; RFC 3448, 6.3.1.
*/
if (sample != 0)
- hcrx->rx_rtt = tfrc_ewma(hcrx->rx_rtt, sample, 9);
+ hc->rx_rtt = tfrc_ewma(hc->rx_rtt, sample, 9);
- } else if (tfrc_lh_update_i_mean(&hcrx->rx_li_hist, skb)) {
+ } else if (tfrc_lh_update_i_mean(&hc->rx_li_hist, skb)) {
/*
* Step (3) of [RFC 3448, 6.1]: Recompute I_mean and, if I_mean
* has decreased (resp. p has increased), send feedback now.
/*
* Check if the periodic once-per-RTT feedback is due; RFC 4342, 10.3
*/
- if (SUB16(dccp_hdr(skb)->dccph_ccval, hcrx->rx_last_counter) > 3)
+ if (SUB16(dccp_hdr(skb)->dccph_ccval, hc->rx_last_counter) > 3)
do_feedback = CCID3_FBACK_PERIODIC;
update_records:
- tfrc_rx_hist_add_packet(&hcrx->rx_hist, skb, ndp);
+ tfrc_rx_hist_add_packet(&hc->rx_hist, skb, ndp);
done_receiving:
if (do_feedback)
static int ccid3_hc_rx_init(struct ccid *ccid, struct sock *sk)
{
- struct ccid3_hc_rx_sock *hcrx = ccid_priv(ccid);
+ struct ccid3_hc_rx_sock *hc = ccid_priv(ccid);
- hcrx->rx_state = TFRC_RSTATE_NO_DATA;
- tfrc_lh_init(&hcrx->rx_li_hist);
- return tfrc_rx_hist_alloc(&hcrx->rx_hist);
+ hc->rx_state = TFRC_RSTATE_NO_DATA;
+ tfrc_lh_init(&hc->rx_li_hist);
+ return tfrc_rx_hist_alloc(&hc->rx_hist);
}
static void ccid3_hc_rx_exit(struct sock *sk)
{
- struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk);
+ struct ccid3_hc_rx_sock *hc = ccid3_hc_rx_sk(sk);
ccid3_hc_rx_set_state(sk, TFRC_RSTATE_TERM);
- tfrc_rx_hist_purge(&hcrx->rx_hist);
- tfrc_lh_cleanup(&hcrx->rx_li_hist);
+ tfrc_rx_hist_purge(&hc->rx_hist);
+ tfrc_lh_cleanup(&hc->rx_li_hist);
}
static void ccid3_hc_rx_get_info(struct sock *sk, struct tcp_info *info)
{
- const struct ccid3_hc_rx_sock *hcrx;
+ const struct ccid3_hc_rx_sock *hc;
/* Listen socks doesn't have a private CCID block */
if (sk->sk_state == DCCP_LISTEN)
return;
- hcrx = ccid3_hc_rx_sk(sk);
- info->tcpi_ca_state = hcrx->rx_state;
+ hc = ccid3_hc_rx_sk(sk);
+ info->tcpi_ca_state = hc->rx_state;
info->tcpi_options |= TCPI_OPT_TIMESTAMPS;
- info->tcpi_rcv_rtt = hcrx->rx_rtt;
+ info->tcpi_rcv_rtt = hc->rx_rtt;
}
static int ccid3_hc_rx_getsockopt(struct sock *sk, const int optname, int len,
u32 __user *optval, int __user *optlen)
{
- const struct ccid3_hc_rx_sock *hcrx;
+ const struct ccid3_hc_rx_sock *hc;
struct tfrc_rx_info rx_info;
const void *val;
if (sk->sk_state == DCCP_LISTEN)
return -EINVAL;
- hcrx = ccid3_hc_rx_sk(sk);
+ hc = ccid3_hc_rx_sk(sk);
switch (optname) {
case DCCP_SOCKOPT_CCID_RX_INFO:
if (len < sizeof(rx_info))
return -EINVAL;
- rx_info.tfrcrx_x_recv = hcrx->rx_x_recv;
- rx_info.tfrcrx_rtt = hcrx->rx_rtt;
- rx_info.tfrcrx_p = hcrx->rx_pinv == 0 ? ~0U :
- scaled_div(1, hcrx->rx_pinv);
+ rx_info.tfrcrx_x_recv = hc->rx_x_recv;
+ rx_info.tfrcrx_rtt = hc->rx_rtt;
+ rx_info.tfrcrx_p = hc->rx_pinv == 0 ? ~0U :
+ scaled_div(1, hc->rx_pinv);
len = sizeof(rx_info);
val = &rx_info;
break;
git.openpandora.org / pandora-kernel.git / commitdiff