#include <linux/config.h>
#include "../ccid.h"
#include "../dccp.h"
-#include "../packet_history.h"
+#include "lib/packet_history.h"
+#include "lib/loss_interval.h"
+#include "lib/tfrc.h"
#include "ccid3.h"
-#ifdef CCID3_DEBUG
-extern int ccid3_debug;
+/*
+ * Reason for maths here is to avoid 32 bit overflow when a is big.
+ * With this we get close to the limit.
+ */
+static inline u32 usecs_div(const u32 a, const u32 b)
+{
+ const u32 div = a < (UINT_MAX / (USEC_PER_SEC / 10)) ? 10 :
+ a < (UINT_MAX / (USEC_PER_SEC / 50)) ? 50 :
+ a < (UINT_MAX / (USEC_PER_SEC / 100)) ? 100 :
+ a < (UINT_MAX / (USEC_PER_SEC / 500)) ? 500 :
+ a < (UINT_MAX / (USEC_PER_SEC / 1000)) ? 1000 :
+ a < (UINT_MAX / (USEC_PER_SEC / 5000)) ? 5000 :
+ a < (UINT_MAX / (USEC_PER_SEC / 10000)) ? 10000 :
+ a < (UINT_MAX / (USEC_PER_SEC / 50000)) ? 50000 :
+ 100000;
+ const u32 tmp = a * (USEC_PER_SEC / div);
+ return (b >= 2 * div) ? tmp / (b / div) : tmp;
+}
+
+static int ccid3_debug;
+#ifdef CCID3_DEBUG
#define ccid3_pr_debug(format, a...) \
do { if (ccid3_debug) \
printk(KERN_DEBUG "%s: " format, __FUNCTION__, ##a); \
#define ccid3_pr_debug(format, a...)
#endif
-#define TFRC_MIN_PACKET_SIZE 16
-#define TFRC_STD_PACKET_SIZE 256
-#define TFRC_MAX_PACKET_SIZE 65535
-
-#define TFRC_INITIAL_TIMEOUT (2 * USEC_PER_SEC)
-/* two seconds as per CCID3 spec 11 */
-
-#define TFRC_OPSYS_HALF_TIME_GRAN (USEC_PER_SEC / (2 * HZ))
-/* above is in usecs - half the scheduling granularity as per RFC3448 4.6 */
-
-#define TFRC_WIN_COUNT_PER_RTT 4
-#define TFRC_WIN_COUNT_LIMIT 16
-
-#define TFRC_MAX_BACK_OFF_TIME 64
-/* above is in seconds */
-
-#define TFRC_SMALLEST_P 40
-
-#define TFRC_RECV_IVAL_F_LENGTH 8 /* length(w[]) */
-
-/* Number of later packets received before one is considered lost */
-#define TFRC_RECV_NUM_LATE_LOSS 3
-
-enum ccid3_options {
- TFRC_OPT_LOSS_EVENT_RATE = 192,
- TFRC_OPT_LOSS_INTERVALS = 193,
- TFRC_OPT_RECEIVE_RATE = 194,
-};
-
-static int ccid3_debug;
-
static struct dccp_tx_hist *ccid3_tx_hist;
static struct dccp_rx_hist *ccid3_rx_hist;
-
-static kmem_cache_t *ccid3_loss_interval_hist_slab;
-
-static inline struct ccid3_loss_interval_hist_entry *
- ccid3_loss_interval_hist_entry_new(const unsigned int __nocast prio)
-{
- return kmem_cache_alloc(ccid3_loss_interval_hist_slab, prio);
-}
-
-static inline void ccid3_loss_interval_hist_entry_delete(struct ccid3_loss_interval_hist_entry *entry)
-{
- if (entry != NULL)
- kmem_cache_free(ccid3_loss_interval_hist_slab, entry);
-}
-
-static void ccid3_loss_interval_history_delete(struct list_head *hist)
-{
- struct ccid3_loss_interval_hist_entry *entry, *next;
-
- list_for_each_entry_safe(entry, next, hist, ccid3lih_node) {
- list_del_init(&entry->ccid3lih_node);
- kmem_cache_free(ccid3_loss_interval_hist_slab, entry);
- }
-}
+static struct dccp_li_hist *ccid3_li_hist;
static int ccid3_init(struct sock *sk)
{
}
#endif
-static inline void ccid3_hc_tx_set_state(struct sock *sk, enum ccid3_hc_tx_states state)
+static inline void ccid3_hc_tx_set_state(struct sock *sk,
+ enum ccid3_hc_tx_states state)
{
- struct dccp_sock *dp = dccp_sk(sk);
- struct ccid3_hc_tx_sock *hctx = dp->dccps_hc_tx_ccid_private;
+ struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
enum ccid3_hc_tx_states oldstate = hctx->ccid3hctx_state;
ccid3_pr_debug("%s(%p) %-8.8s -> %s\n",
- dccp_role(sk), sk, ccid3_tx_state_name(oldstate), ccid3_tx_state_name(state));
+ dccp_role(sk), sk, ccid3_tx_state_name(oldstate),
+ ccid3_tx_state_name(state));
WARN_ON(state == oldstate);
hctx->ccid3hctx_state = state;
}
-static void timeval_sub(struct timeval large, struct timeval small,
- struct timeval *result)
-{
- result->tv_sec = large.tv_sec-small.tv_sec;
- if (large.tv_usec < small.tv_usec) {
- (result->tv_sec)--;
- result->tv_usec = USEC_PER_SEC +
- large.tv_usec - small.tv_usec;
- } else
- result->tv_usec = large.tv_usec-small.tv_usec;
-}
-
-static inline void timeval_fix(struct timeval *tv)
-{
- if (tv->tv_usec >= USEC_PER_SEC) {
- tv->tv_sec++;
- tv->tv_usec -= USEC_PER_SEC;
- }
-}
-
-#define CALCX_ARRSIZE 500
-
-#define CALCX_SPLIT 50000
-/* equivalent to 0.05 */
-
-static const u32 calcx_lookup[CALCX_ARRSIZE][2] = {
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-};
-
-/* Calculate the send rate as per section 3.1 of RFC3448
-
-Returns send rate in bytes per second
-
-Integer maths and lookups are used as not allowed floating point in kernel
-
-The function for Xcalc as per section 3.1 of RFC3448 is:
-
-X = s
- -------------------------------------------------------------
- R*sqrt(2*b*p/3) + (t_RTO * (3*sqrt(3*b*p/8) * p * (1+32*p^2)))
-
-where
-X is the trasmit rate in bytes/second
-s is the packet size in bytes
-R is the round trip time in seconds
-p is the loss event rate, between 0 and 1.0, of the number of loss events
- as a fraction of the number of packets transmitted
-t_RTO is the TCP retransmission timeout value in seconds
-b is the number of packets acknowledged by a single TCP acknowledgement
-
-we can assume that b = 1 and t_RTO is 4 * R. With this the equation becomes:
-
-X = s
- -----------------------------------------------------------------------
- R * sqrt(2 * p / 3) + (12 * R * (sqrt(3 * p / 8) * p * (1 + 32 * p^2)))
-
-
-which we can break down into:
-
-X = s
- --------
- R * f(p)
-
-where f(p) = sqrt(2 * p / 3) + (12 * sqrt(3 * p / 8) * p * (1 + 32 * p * p))
-
-Function parameters:
-s - bytes
-R - RTT in usecs
-p - loss rate (decimal fraction multiplied by 1,000,000)
-
-Returns Xcalc in bytes per second
-
-DON'T alter this code unless you run test cases against it as the code
-has been manipulated to stop underflow/overlow.
-
-*/
-static u32 ccid3_calc_x(u16 s, u32 R, u32 p)
-{
- int index;
- u32 f;
- u64 tmp1, tmp2;
-
- if (p < CALCX_SPLIT)
- index = (p / (CALCX_SPLIT / CALCX_ARRSIZE)) - 1;
- else
- index = (p / (1000000 / CALCX_ARRSIZE)) - 1;
-
- if (index < 0)
- /* p should be 0 unless there is a bug in my code */
- index = 0;
-
- if (R == 0)
- R = 1; /* RTT can't be zero or else divide by zero */
-
- BUG_ON(index >= CALCX_ARRSIZE);
-
- if (p >= CALCX_SPLIT)
- f = calcx_lookup[index][0];
- else
- f = calcx_lookup[index][1];
-
- tmp1 = ((u64)s * 100000000);
- tmp2 = ((u64)R * (u64)f);
- do_div(tmp2,10000);
- do_div(tmp1,tmp2);
- /* don't alter above math unless you test due to overflow on 32 bit */
-
- return (u32)tmp1;
-}
-
/* Calculate new t_ipi (inter packet interval) by t_ipi = s / X_inst */
static inline void ccid3_calc_new_t_ipi(struct ccid3_hc_tx_sock *hctx)
{
- if (hctx->ccid3hctx_state == TFRC_SSTATE_NO_FBACK)
- return;
- /* if no feedback spec says t_ipi is 1 second (set elsewhere and then
- * doubles after every no feedback timer (separate function) */
-
- if (hctx->ccid3hctx_x < 10) {
- ccid3_pr_debug("ccid3_calc_new_t_ipi - ccid3hctx_x < 10\n");
- hctx->ccid3hctx_x = 10;
- }
- hctx->ccid3hctx_t_ipi = (hctx->ccid3hctx_s * 100000)
- / (hctx->ccid3hctx_x / 10);
- /* reason for above maths with 10 in there is to avoid 32 bit
- * overflow for jumbo packets */
-
+ /*
+ * If no feedback spec says t_ipi is 1 second (set elsewhere and then
+ * doubles after every no feedback timer (separate function)
+ */
+ if (hctx->ccid3hctx_state != TFRC_SSTATE_NO_FBACK)
+ hctx->ccid3hctx_t_ipi = usecs_div(hctx->ccid3hctx_s,
+ hctx->ccid3hctx_x);
}
/* Calculate new delta by delta = min(t_ipi / 2, t_gran / 2) */
static inline void ccid3_calc_new_delta(struct ccid3_hc_tx_sock *hctx)
{
- hctx->ccid3hctx_delta = min_t(u32, hctx->ccid3hctx_t_ipi / 2, TFRC_OPSYS_HALF_TIME_GRAN);
-
+ hctx->ccid3hctx_delta = min_t(u32, hctx->ccid3hctx_t_ipi / 2,
+ TFRC_OPSYS_HALF_TIME_GRAN);
}
/*
*/
static void ccid3_hc_tx_update_x(struct sock *sk)
{
- struct dccp_sock *dp = dccp_sk(sk);
- struct ccid3_hc_tx_sock *hctx = dp->dccps_hc_tx_ccid_private;
-
- if (hctx->ccid3hctx_p >= TFRC_SMALLEST_P) { /* to avoid large error in calcX */
- hctx->ccid3hctx_x_calc = ccid3_calc_x(hctx->ccid3hctx_s,
- hctx->ccid3hctx_rtt,
- hctx->ccid3hctx_p);
- hctx->ccid3hctx_x = max_t(u32, min_t(u32, hctx->ccid3hctx_x_calc, 2 * hctx->ccid3hctx_x_recv),
- hctx->ccid3hctx_s / TFRC_MAX_BACK_OFF_TIME);
- } else if (now_delta(hctx->ccid3hctx_t_ld) >= hctx->ccid3hctx_rtt) {
- u32 rtt = hctx->ccid3hctx_rtt;
- if (rtt < 10) {
- rtt = 10;
- } /* avoid divide by zero below */
-
- hctx->ccid3hctx_x = max_t(u32, min_t(u32, 2 * hctx->ccid3hctx_x_recv, 2 * hctx->ccid3hctx_x),
- (hctx->ccid3hctx_s * 100000) / (rtt / 10));
- /* Using 100000 and 10 to avoid 32 bit overflow for jumbo frames */
- do_gettimeofday(&hctx->ccid3hctx_t_ld);
- }
-
- if (hctx->ccid3hctx_x == 0) {
- ccid3_pr_debug("ccid3hctx_x = 0!\n");
- hctx->ccid3hctx_x = 1;
+ struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
+
+ /* To avoid large error in calcX */
+ if (hctx->ccid3hctx_p >= TFRC_SMALLEST_P) {
+ hctx->ccid3hctx_x_calc = tfrc_calc_x(hctx->ccid3hctx_s,
+ hctx->ccid3hctx_rtt,
+ hctx->ccid3hctx_p);
+ hctx->ccid3hctx_x = max_t(u32, min_t(u32, hctx->ccid3hctx_x_calc,
+ 2 * hctx->ccid3hctx_x_recv),
+ (hctx->ccid3hctx_s /
+ TFRC_MAX_BACK_OFF_TIME));
+ } else {
+ struct timeval now;
+
+ dccp_timestamp(sk, &now);
+ if (timeval_delta(&now, &hctx->ccid3hctx_t_ld) >=
+ hctx->ccid3hctx_rtt) {
+ hctx->ccid3hctx_x = max_t(u32, min_t(u32, hctx->ccid3hctx_x_recv,
+ hctx->ccid3hctx_x) * 2,
+ usecs_div(hctx->ccid3hctx_s,
+ hctx->ccid3hctx_rtt));
+ hctx->ccid3hctx_t_ld = now;
+ }
}
}
static void ccid3_hc_tx_no_feedback_timer(unsigned long data)
{
struct sock *sk = (struct sock *)data;
- struct dccp_sock *dp = dccp_sk(sk);
unsigned long next_tmout = 0;
- struct ccid3_hc_tx_sock *hctx = dp->dccps_hc_tx_ccid_private;
- u32 rtt;
+ struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
bh_lock_sock(sk);
if (sock_owned_by_user(sk)) {
/* Try again later. */
/* XXX: set some sensible MIB */
- sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, jiffies + HZ / 5);
+ sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer,
+ jiffies + HZ / 5);
goto out;
}
ccid3_pr_debug("%s, sk=%p, state=%s\n", dccp_role(sk), sk,
ccid3_tx_state_name(hctx->ccid3hctx_state));
- if (hctx->ccid3hctx_x < 10) {
- ccid3_pr_debug("TFRC_SSTATE_NO_FBACK ccid3hctx_x < 10\n");
- hctx->ccid3hctx_x = 10;
- }
-
switch (hctx->ccid3hctx_state) {
case TFRC_SSTATE_TERM:
goto out;
case TFRC_SSTATE_NO_FBACK:
/* Halve send rate */
hctx->ccid3hctx_x /= 2;
- if (hctx->ccid3hctx_x < (hctx->ccid3hctx_s / TFRC_MAX_BACK_OFF_TIME))
- hctx->ccid3hctx_x = hctx->ccid3hctx_s / TFRC_MAX_BACK_OFF_TIME;
+ if (hctx->ccid3hctx_x < (hctx->ccid3hctx_s /
+ TFRC_MAX_BACK_OFF_TIME))
+ hctx->ccid3hctx_x = (hctx->ccid3hctx_s /
+ TFRC_MAX_BACK_OFF_TIME);
- ccid3_pr_debug("%s, sk=%p, state=%s, updated tx rate to %d bytes/s\n",
- dccp_role(sk), sk, ccid3_tx_state_name(hctx->ccid3hctx_state),
+ ccid3_pr_debug("%s, sk=%p, state=%s, updated tx rate to %d "
+ "bytes/s\n",
+ dccp_role(sk), sk,
+ ccid3_tx_state_name(hctx->ccid3hctx_state),
hctx->ccid3hctx_x);
- next_tmout = max_t(u32, 2 * (hctx->ccid3hctx_s * 100000)
- / (hctx->ccid3hctx_x / 10), TFRC_INITIAL_TIMEOUT);
- /* do above maths with 100000 and 10 to prevent overflow on 32 bit */
- /* FIXME - not sure above calculation is correct. See section 5 of CCID3 11
- * should adjust tx_t_ipi and double that to achieve it really */
+ next_tmout = max_t(u32, 2 * usecs_div(hctx->ccid3hctx_s,
+ hctx->ccid3hctx_x),
+ TFRC_INITIAL_TIMEOUT);
+ /*
+ * FIXME - not sure above calculation is correct. See section
+ * 5 of CCID3 11 should adjust tx_t_ipi and double that to
+ * achieve it really
+ */
break;
case TFRC_SSTATE_FBACK:
- /* Check if IDLE since last timeout and recv rate is less than 4 packets per RTT */
- rtt = hctx->ccid3hctx_rtt;
- if (rtt < 10)
- rtt = 10;
- /* stop divide by zero below */
- if (!hctx->ccid3hctx_idle || (hctx->ccid3hctx_x_recv >=
- 4 * (hctx->ccid3hctx_s * 100000) / (rtt / 10))) {
- ccid3_pr_debug("%s, sk=%p, state=%s, not idle\n", dccp_role(sk), sk,
+ /*
+ * Check if IDLE since last timeout and recv rate is less than
+ * 4 packets per RTT
+ */
+ if (!hctx->ccid3hctx_idle ||
+ (hctx->ccid3hctx_x_recv >=
+ 4 * usecs_div(hctx->ccid3hctx_s, hctx->ccid3hctx_rtt))) {
+ ccid3_pr_debug("%s, sk=%p, state=%s, not idle\n",
+ dccp_role(sk), sk,
ccid3_tx_state_name(hctx->ccid3hctx_state));
/* Halve sending rate */
* Else
* X_recv = X_calc / 4;
*/
- BUG_ON(hctx->ccid3hctx_p >= TFRC_SMALLEST_P && hctx->ccid3hctx_x_calc == 0);
+ BUG_ON(hctx->ccid3hctx_p >= TFRC_SMALLEST_P &&
+ hctx->ccid3hctx_x_calc == 0);
/* check also if p is zero -> x_calc is infinity? */
if (hctx->ccid3hctx_p < TFRC_SMALLEST_P ||
/* Update sending rate */
ccid3_hc_tx_update_x(sk);
}
- if (hctx->ccid3hctx_x == 0) {
- ccid3_pr_debug("TFRC_SSTATE_FBACK ccid3hctx_x = 0!\n");
- hctx->ccid3hctx_x = 10;
- }
- /* Schedule no feedback timer to expire in max(4 * R, 2 * s / X) */
+ /*
+ * Schedule no feedback timer to expire in
+ * max(4 * R, 2 * s / X)
+ */
next_tmout = max_t(u32, hctx->ccid3hctx_t_rto,
- 2 * (hctx->ccid3hctx_s * 100000) / (hctx->ccid3hctx_x / 10));
+ 2 * usecs_div(hctx->ccid3hctx_s,
+ hctx->ccid3hctx_x));
break;
default:
printk(KERN_CRIT "%s: %s, sk=%p, Illegal state (%d)!\n",
}
sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer,
- jiffies + max_t(u32, 1, usecs_to_jiffies(next_tmout)));
+ jiffies + max_t(u32, 1, usecs_to_jiffies(next_tmout)));
hctx->ccid3hctx_idle = 1;
out:
bh_unlock_sock(sk);
struct sk_buff *skb, int len)
{
struct dccp_sock *dp = dccp_sk(sk);
- struct ccid3_hc_tx_sock *hctx = dp->dccps_hc_tx_ccid_private;
+ struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
struct dccp_tx_hist_entry *new_packet;
struct timeval now;
long delay;
int rc = -ENOTCONN;
-// ccid3_pr_debug("%s, sk=%p, skb=%p, len=%d\n", dccp_role(sk), sk, skb, len);
+ /* Check if pure ACK or Terminating*/
+
/*
- * check if pure ACK or Terminating */
- /* XXX: We only call this function for DATA and DATAACK, on, these packets can have
- * zero length, but why the comment about "pure ACK"?
+ * XXX: We only call this function for DATA and DATAACK, on, these
+ * packets can have zero length, but why the comment about "pure ACK"?
*/
- if (hctx == NULL || len == 0 || hctx->ccid3hctx_state == TFRC_SSTATE_TERM)
+ if (hctx == NULL || len == 0 ||
+ hctx->ccid3hctx_state == TFRC_SSTATE_TERM)
goto out;
/* See if last packet allocated was not sent */
new_packet = dccp_tx_hist_head(&hctx->ccid3hctx_hist);
if (new_packet == NULL || new_packet->dccphtx_sent) {
- new_packet = dccp_tx_hist_entry_new(ccid3_tx_hist, SLAB_ATOMIC);
+ new_packet = dccp_tx_hist_entry_new(ccid3_tx_hist,
+ SLAB_ATOMIC);
rc = -ENOBUFS;
if (new_packet == NULL) {
ccid3_pr_debug("%s, sk=%p, not enough mem to add "
- "to history, send refused\n", dccp_role(sk), sk);
+ "to history, send refused\n",
+ dccp_role(sk), sk);
goto out;
}
dccp_tx_hist_add_entry(&hctx->ccid3hctx_hist, new_packet);
}
- do_gettimeofday(&now);
+ dccp_timestamp(sk, &now);
switch (hctx->ccid3hctx_state) {
case TFRC_SSTATE_NO_SENT:
- ccid3_pr_debug("%s, sk=%p, first packet(%llu)\n", dccp_role(sk), sk,
- dp->dccps_gss);
+ ccid3_pr_debug("%s, sk=%p, first packet(%llu)\n",
+ dccp_role(sk), sk, dp->dccps_gss);
hctx->ccid3hctx_no_feedback_timer.function = ccid3_hc_tx_no_feedback_timer;
hctx->ccid3hctx_no_feedback_timer.data = (unsigned long)sk;
- sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer, jiffies + usecs_to_jiffies(TFRC_INITIAL_TIMEOUT));
+ sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer,
+ jiffies + usecs_to_jiffies(TFRC_INITIAL_TIMEOUT));
hctx->ccid3hctx_last_win_count = 0;
hctx->ccid3hctx_t_last_win_count = now;
ccid3_hc_tx_set_state(sk, TFRC_SSTATE_NO_FBACK);
/* Set nominal send time for initial packet */
hctx->ccid3hctx_t_nom = now;
- (hctx->ccid3hctx_t_nom).tv_usec += hctx->ccid3hctx_t_ipi;
- timeval_fix(&(hctx->ccid3hctx_t_nom));
+ timeval_add_usecs(&hctx->ccid3hctx_t_nom,
+ hctx->ccid3hctx_t_ipi);
ccid3_calc_new_delta(hctx);
rc = 0;
break;
case TFRC_SSTATE_NO_FBACK:
case TFRC_SSTATE_FBACK:
- delay = (now_delta(hctx->ccid3hctx_t_nom) - hctx->ccid3hctx_delta);
+ delay = (timeval_delta(&now, &hctx->ccid3hctx_t_nom) -
+ hctx->ccid3hctx_delta);
ccid3_pr_debug("send_packet delay=%ld\n", delay);
delay /= -1000;
/* divide by -1000 is to convert to ms and get sign right */
- rc = delay > 0 ? -EAGAIN : 0;
+ rc = delay > 0 ? delay : 0;
break;
default:
printk(KERN_CRIT "%s: %s, sk=%p, Illegal state (%d)!\n",
}
/* Can we send? if so add options and add to packet history */
- if (rc == 0)
+ if (rc == 0) {
+ dp->dccps_hc_tx_insert_options = 1;
new_packet->dccphtx_ccval =
DCCP_SKB_CB(skb)->dccpd_ccval =
hctx->ccid3hctx_last_win_count;
+ }
out:
return rc;
}
static void ccid3_hc_tx_packet_sent(struct sock *sk, int more, int len)
{
- struct dccp_sock *dp = dccp_sk(sk);
- struct ccid3_hc_tx_sock *hctx = dp->dccps_hc_tx_ccid_private;
+ const struct dccp_sock *dp = dccp_sk(sk);
+ struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
struct timeval now;
BUG_ON(hctx == NULL);
return;
}
- do_gettimeofday(&now);
+ dccp_timestamp(sk, &now);
/* check if we have sent a data packet */
if (len > 0) {
packet = dccp_tx_hist_head(&hctx->ccid3hctx_hist);
if (packet == NULL) {
- printk(KERN_CRIT "%s: packet doesn't exists in history!\n", __FUNCTION__);
+ printk(KERN_CRIT "%s: packet doesn't exists in "
+ "history!\n", __FUNCTION__);
return;
}
if (packet->dccphtx_sent) {
- printk(KERN_CRIT "%s: no unsent packet in history!\n", __FUNCTION__);
+ printk(KERN_CRIT "%s: no unsent packet in history!\n",
+ __FUNCTION__);
return;
}
packet->dccphtx_tstamp = now;
packet->dccphtx_seqno = dp->dccps_gss;
-#if 0
- ccid3_pr_debug("%s, sk=%p, seqno=%llu inserted!\n",
- dccp_role(sk), sk, packet->dccphtx_seqno);
-#endif
/*
- * Check if win_count have changed */
- /* COMPLIANCE_BEGIN
- * Algorithm in "8.1. Window Counter Valuer" in draft-ietf-dccp-ccid3-11.txt
+ * Check if win_count have changed
+ * Algorithm in "8.1. Window Counter Valuer" in
+ * draft-ietf-dccp-ccid3-11.txt
*/
- quarter_rtt = now_delta(hctx->ccid3hctx_t_last_win_count) / (hctx->ccid3hctx_rtt / 4);
+ quarter_rtt = timeval_delta(&now, &hctx->ccid3hctx_t_last_win_count);
+ if (likely(hctx->ccid3hctx_rtt > 8))
+ quarter_rtt /= hctx->ccid3hctx_rtt / 4;
+
if (quarter_rtt > 0) {
hctx->ccid3hctx_t_last_win_count = now;
hctx->ccid3hctx_last_win_count = (hctx->ccid3hctx_last_win_count +
min_t(unsigned long, quarter_rtt, 5)) % 16;
- ccid3_pr_debug("%s, sk=%p, window changed from %u to %u!\n",
+ ccid3_pr_debug("%s, sk=%p, window changed from "
+ "%u to %u!\n",
dccp_role(sk), sk,
packet->dccphtx_ccval,
hctx->ccid3hctx_last_win_count);
}
- /* COMPLIANCE_END */
-#if 0
- ccid3_pr_debug("%s, sk=%p, packet sent (%llu,%u)\n",
- dccp_role(sk), sk,
- packet->dccphtx_seqno,
- packet->dccphtx_ccval);
-#endif
+
hctx->ccid3hctx_idle = 0;
packet->dccphtx_rtt = hctx->ccid3hctx_rtt;
packet->dccphtx_sent = 1;
case TFRC_SSTATE_NO_SENT:
/* if first wasn't pure ack */
if (len != 0)
- printk(KERN_CRIT "%s: %s, First packet sent is noted as a data packet\n",
+ printk(KERN_CRIT "%s: %s, First packet sent is noted "
+ "as a data packet\n",
__FUNCTION__, dccp_role(sk));
return;
case TFRC_SSTATE_NO_FBACK:
hctx->ccid3hctx_t_nom = now;
ccid3_calc_new_t_ipi(hctx);
ccid3_calc_new_delta(hctx);
- (hctx->ccid3hctx_t_nom).tv_usec += hctx->ccid3hctx_t_ipi;
- timeval_fix(&(hctx->ccid3hctx_t_nom));
+ timeval_add_usecs(&hctx->ccid3hctx_t_nom,
+ hctx->ccid3hctx_t_ipi);
}
break;
default:
static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb)
{
- struct dccp_sock *dp = dccp_sk(sk);
- struct ccid3_hc_tx_sock *hctx = dp->dccps_hc_tx_ccid_private;
+ const struct dccp_sock *dp = dccp_sk(sk);
+ struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
struct ccid3_options_received *opt_recv;
struct dccp_tx_hist_entry *packet;
+ struct timeval now;
unsigned long next_tmout;
u32 t_elapsed;
u32 pinv;
u32 x_recv;
u32 r_sample;
-#if 0
- ccid3_pr_debug("%s, sk=%p(%s), skb=%p(%s)\n",
- dccp_role(sk), sk, dccp_state_name(sk->sk_state),
- skb, dccp_packet_name(DCCP_SKB_CB(skb)->dccpd_type));
-#endif
+
if (hctx == NULL)
return;
if (hctx->ccid3hctx_state == TFRC_SSTATE_TERM) {
- ccid3_pr_debug("%s, sk=%p, received a packet when terminating!\n", dccp_role(sk), sk);
+ ccid3_pr_debug("%s, sk=%p, received a packet when "
+ "terminating!\n", dccp_role(sk), sk);
return;
}
opt_recv = &hctx->ccid3hctx_options_received;
- t_elapsed = dp->dccps_options_received.dccpor_elapsed_time;
+ t_elapsed = dp->dccps_options_received.dccpor_elapsed_time * 10;
x_recv = opt_recv->ccid3or_receive_rate;
pinv = opt_recv->ccid3or_loss_event_rate;
packet = dccp_tx_hist_find_entry(&hctx->ccid3hctx_hist,
DCCP_SKB_CB(skb)->dccpd_ack_seq);
if (packet == NULL) {
- ccid3_pr_debug("%s, sk=%p, seqno %llu(%s) does't exist in history!\n",
- dccp_role(sk), sk, DCCP_SKB_CB(skb)->dccpd_ack_seq,
+ ccid3_pr_debug("%s, sk=%p, seqno %llu(%s) does't "
+ "exist in history!\n",
+ dccp_role(sk), sk,
+ DCCP_SKB_CB(skb)->dccpd_ack_seq,
dccp_packet_name(DCCP_SKB_CB(skb)->dccpd_type));
return;
}
/* Update RTT */
- r_sample = now_delta(packet->dccphtx_tstamp);
- /* FIXME: */
- // r_sample -= usecs_to_jiffies(t_elapsed * 10);
+ dccp_timestamp(sk, &now);
+ r_sample = timeval_delta(&now, &packet->dccphtx_tstamp);
+ if (unlikely(r_sample <= t_elapsed))
+ LIMIT_NETDEBUG(KERN_WARNING
+ "%s: r_sample=%uus, t_elapsed=%uus\n",
+ __FUNCTION__, r_sample, t_elapsed);
+ else
+ r_sample -= t_elapsed;
/* Update RTT estimate by
* If (No feedback recv)
ccid3_hc_tx_set_state(sk, TFRC_SSTATE_FBACK);
hctx->ccid3hctx_rtt = r_sample;
} else
- hctx->ccid3hctx_rtt = (hctx->ccid3hctx_rtt * 9) / 10 + r_sample / 10;
+ hctx->ccid3hctx_rtt = (hctx->ccid3hctx_rtt * 9) / 10 +
+ r_sample / 10;
- /*
- * XXX: this is to avoid a division by zero in ccid3_hc_tx_packet_sent
- * implemention of the new window count.
- */
- if (hctx->ccid3hctx_rtt < 4)
- hctx->ccid3hctx_rtt = 4;
-
- ccid3_pr_debug("%s, sk=%p, New RTT estimate=%uus, r_sample=%us\n",
- dccp_role(sk), sk,
- hctx->ccid3hctx_rtt,
- r_sample);
+ ccid3_pr_debug("%s, sk=%p, New RTT estimate=%uus, "
+ "r_sample=%us\n", dccp_role(sk), sk,
+ hctx->ccid3hctx_rtt, r_sample);
/* Update timeout interval */
hctx->ccid3hctx_t_rto = max_t(u32, 4 * hctx->ccid3hctx_rtt,
USEC_PER_SEC);
/* Update receive rate */
- hctx->ccid3hctx_x_recv = x_recv; /* x_recv in bytes per second */
+ hctx->ccid3hctx_x_recv = x_recv;/* X_recv in bytes per sec */
/* Update loss event rate */
if (pinv == ~0 || pinv == 0)
if (hctx->ccid3hctx_p < TFRC_SMALLEST_P) {
hctx->ccid3hctx_p = TFRC_SMALLEST_P;
- ccid3_pr_debug("%s, sk=%p, Smallest p used!\n", dccp_role(sk), sk);
+ ccid3_pr_debug("%s, sk=%p, Smallest p used!\n",
+ dccp_role(sk), sk);
}
}
ccid3_hc_tx_update_x(sk);
/* Update next send time */
- if (hctx->ccid3hctx_t_ipi > (hctx->ccid3hctx_t_nom).tv_usec) {
- hctx->ccid3hctx_t_nom.tv_usec += USEC_PER_SEC;
- (hctx->ccid3hctx_t_nom).tv_sec--;
- }
- /* FIXME - if no feedback then t_ipi can go > 1 second */
- (hctx->ccid3hctx_t_nom).tv_usec -= hctx->ccid3hctx_t_ipi;
+ timeval_sub_usecs(&hctx->ccid3hctx_t_nom,
+ hctx->ccid3hctx_t_ipi);
ccid3_calc_new_t_ipi(hctx);
- (hctx->ccid3hctx_t_nom).tv_usec += hctx->ccid3hctx_t_ipi;
- timeval_fix(&(hctx->ccid3hctx_t_nom));
+ timeval_add_usecs(&hctx->ccid3hctx_t_nom,
+ hctx->ccid3hctx_t_ipi);
ccid3_calc_new_delta(hctx);
/* remove all packets older than the one acked from history */
dccp_tx_hist_purge_older(ccid3_tx_hist,
&hctx->ccid3hctx_hist, packet);
+ /*
+ * As we have calculated new ipi, delta, t_nom it is possible that
+ * we now can send a packet, so wake up dccp_wait_for_ccids.
+ */
+ sk->sk_write_space(sk);
- if (hctx->ccid3hctx_x < 10) {
- ccid3_pr_debug("ccid3_hc_tx_packet_recv hctx->ccid3hctx_x < 10\n");
- hctx->ccid3hctx_x = 10;
- }
- /* to prevent divide by zero below */
-
- /* Schedule no feedback timer to expire in max(4 * R, 2 * s / X) */
+ /*
+ * Schedule no feedback timer to expire in
+ * max(4 * R, 2 * s / X)
+ */
next_tmout = max(hctx->ccid3hctx_t_rto,
- (2 * (hctx->ccid3hctx_s * 100000) /
- (hctx->ccid3hctx_x / 10)));
- /* maths with 100000 and 10 is to prevent overflow with 32 bit */
-
- 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);
+ 2 * usecs_div(hctx->ccid3hctx_s,
+ hctx->ccid3hctx_x));
+
+ 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);
sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer,
- jiffies + max_t(u32,1,usecs_to_jiffies(next_tmout)));
+ jiffies + max_t(u32, 1, usecs_to_jiffies(next_tmout)));
/* set idle flag */
hctx->ccid3hctx_idle = 1;
static void ccid3_hc_tx_insert_options(struct sock *sk, struct sk_buff *skb)
{
- const struct dccp_sock *dp = dccp_sk(sk);
- struct ccid3_hc_tx_sock *hctx = dp->dccps_hc_tx_ccid_private;
+ struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
- if (hctx == NULL || !(sk->sk_state == DCCP_OPEN || sk->sk_state == DCCP_PARTOPEN))
+ if (hctx == NULL || !(sk->sk_state == DCCP_OPEN ||
+ sk->sk_state == DCCP_PARTOPEN))
return;
DCCP_SKB_CB(skb)->dccpd_ccval = hctx->ccid3hctx_last_win_count;
}
static int ccid3_hc_tx_parse_options(struct sock *sk, unsigned char option,
- unsigned char len, u16 idx, unsigned char *value)
+ unsigned char len, u16 idx,
+ unsigned char *value)
{
int rc = 0;
- struct dccp_sock *dp = dccp_sk(sk);
- struct ccid3_hc_tx_sock *hctx = dp->dccps_hc_tx_ccid_private;
+ const struct dccp_sock *dp = dccp_sk(sk);
+ struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
struct ccid3_options_received *opt_recv;
if (hctx == NULL)
switch (option) {
case TFRC_OPT_LOSS_EVENT_RATE:
if (len != 4) {
- ccid3_pr_debug("%s, sk=%p, invalid len for TFRC_OPT_LOSS_EVENT_RATE\n",
+ ccid3_pr_debug("%s, sk=%p, invalid len for "
+ "TFRC_OPT_LOSS_EVENT_RATE\n",
dccp_role(sk), sk);
rc = -EINVAL;
} else {
break;
case TFRC_OPT_RECEIVE_RATE:
if (len != 4) {
- ccid3_pr_debug("%s, sk=%p, invalid len for TFRC_OPT_RECEIVE_RATE\n",
+ ccid3_pr_debug("%s, sk=%p, invalid len for "
+ "TFRC_OPT_RECEIVE_RATE\n",
dccp_role(sk), sk);
rc = -EINVAL;
} else {
ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk);
- hctx = dp->dccps_hc_tx_ccid_private = kmalloc(sizeof(*hctx), gfp_any());
- if (hctx == NULL)
+ dp->dccps_hc_tx_ccid_private = kmalloc(sizeof(*hctx), gfp_any());
+ if (dp->dccps_hc_tx_ccid_private == NULL)
return -ENOMEM;
+ hctx = ccid3_hc_tx_sk(sk);
memset(hctx, 0, sizeof(*hctx));
- if (dp->dccps_avg_packet_size >= TFRC_MIN_PACKET_SIZE &&
- dp->dccps_avg_packet_size <= TFRC_MAX_PACKET_SIZE)
- hctx->ccid3hctx_s = (u16)dp->dccps_avg_packet_size;
+ if (dp->dccps_packet_size >= TFRC_MIN_PACKET_SIZE &&
+ dp->dccps_packet_size <= TFRC_MAX_PACKET_SIZE)
+ hctx->ccid3hctx_s = dp->dccps_packet_size;
else
hctx->ccid3hctx_s = TFRC_STD_PACKET_SIZE;
- hctx->ccid3hctx_x = hctx->ccid3hctx_s; /* set transmission rate to 1 packet per second */
- hctx->ccid3hctx_rtt = 4; /* See ccid3_hc_tx_packet_sent win_count calculatation */
+ /* Set transmission rate to 1 packet per second */
+ hctx->ccid3hctx_x = hctx->ccid3hctx_s;
hctx->ccid3hctx_t_rto = USEC_PER_SEC;
hctx->ccid3hctx_state = TFRC_SSTATE_NO_SENT;
INIT_LIST_HEAD(&hctx->ccid3hctx_hist);
static void ccid3_hc_tx_exit(struct sock *sk)
{
struct dccp_sock *dp = dccp_sk(sk);
- struct ccid3_hc_tx_sock *hctx = dp->dccps_hc_tx_ccid_private;
+ struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk);
BUG_ON(hctx == NULL);
}
#endif
-static inline void ccid3_hc_rx_set_state(struct sock *sk, enum ccid3_hc_rx_states state)
+static inline void ccid3_hc_rx_set_state(struct sock *sk,
+ enum ccid3_hc_rx_states state)
{
- struct dccp_sock *dp = dccp_sk(sk);
- struct ccid3_hc_rx_sock *hcrx = dp->dccps_hc_rx_ccid_private;
+ struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk);
enum ccid3_hc_rx_states oldstate = hcrx->ccid3hcrx_state;
ccid3_pr_debug("%s(%p) %-8.8s -> %s\n",
- dccp_role(sk), sk, ccid3_rx_state_name(oldstate), ccid3_rx_state_name(state));
+ dccp_role(sk), sk, ccid3_rx_state_name(oldstate),
+ ccid3_rx_state_name(state));
WARN_ON(state == oldstate);
hcrx->ccid3hcrx_state = state;
}
-static int ccid3_hc_rx_add_hist(struct sock *sk,
- struct dccp_rx_hist_entry *packet)
-{
- struct dccp_sock *dp = dccp_sk(sk);
- struct ccid3_hc_rx_sock *hcrx = dp->dccps_hc_rx_ccid_private;
- struct dccp_rx_hist_entry *entry, *next, *iter;
- u8 num_later = 0;
-
- iter = dccp_rx_hist_head(&hcrx->ccid3hcrx_hist);
- if (iter == NULL)
- dccp_rx_hist_add_entry(&hcrx->ccid3hcrx_hist, packet);
- else {
- const u64 seqno = packet->dccphrx_seqno;
-
- if (after48(seqno, iter->dccphrx_seqno))
- dccp_rx_hist_add_entry(&hcrx->ccid3hcrx_hist, packet);
- else {
- if (dccp_rx_hist_entry_data_packet(iter))
- num_later = 1;
-
- list_for_each_entry_continue(iter,
- &hcrx->ccid3hcrx_hist,
- dccphrx_node) {
- if (after48(seqno, iter->dccphrx_seqno)) {
- dccp_rx_hist_add_entry(&iter->dccphrx_node,
- packet);
- goto trim_history;
- }
-
- if (dccp_rx_hist_entry_data_packet(iter))
- num_later++;
-
- if (num_later == TFRC_RECV_NUM_LATE_LOSS) {
- dccp_rx_hist_entry_delete(ccid3_rx_hist, packet);
- ccid3_pr_debug("%s, sk=%p, packet(%llu) already lost!\n",
- dccp_role(sk), sk, seqno);
- return 1;
- }
- }
-
- if (num_later < TFRC_RECV_NUM_LATE_LOSS)
- dccp_rx_hist_add_entry(&hcrx->ccid3hcrx_hist,
- packet);
- /* FIXME: else what? should we destroy the packet like above? */
- }
- }
-
-trim_history:
- /* Trim history (remove all packets after the NUM_LATE_LOSS + 1 data packets) */
- num_later = TFRC_RECV_NUM_LATE_LOSS + 1;
-
- if (!list_empty(&hcrx->ccid3hcrx_loss_interval_hist)) {
- list_for_each_entry_safe(entry, next, &hcrx->ccid3hcrx_hist,
- dccphrx_node) {
- if (num_later == 0) {
- list_del_init(&entry->dccphrx_node);
- dccp_rx_hist_entry_delete(ccid3_rx_hist, entry);
- } else if (dccp_rx_hist_entry_data_packet(entry))
- --num_later;
- }
- } else {
- int step = 0;
- u8 win_count = 0; /* Not needed, but lets shut up gcc */
- int tmp;
- /*
- * We have no loss interval history so we need at least one
- * rtt:s of data packets to approximate rtt.
- */
- list_for_each_entry_safe(entry, next, &hcrx->ccid3hcrx_hist,
- dccphrx_node) {
- if (num_later == 0) {
- switch (step) {
- case 0:
- step = 1;
- /* OK, find next data packet */
- num_later = 1;
- break;
- case 1:
- step = 2;
- /* OK, find next data packet */
- num_later = 1;
- win_count = entry->dccphrx_ccval;
- break;
- case 2:
- tmp = win_count - entry->dccphrx_ccval;
- if (tmp < 0)
- tmp += TFRC_WIN_COUNT_LIMIT;
- if (tmp > TFRC_WIN_COUNT_PER_RTT + 1) {
- /* we have found a packet older than one rtt
- * remove the rest */
- step = 3;
- } else /* OK, find next data packet */
- num_later = 1;
- break;
- case 3:
- list_del_init(&entry->dccphrx_node);
- dccp_rx_hist_entry_delete(ccid3_rx_hist, entry);
- break;
- }
- } else if (dccp_rx_hist_entry_data_packet(entry))
- --num_later;
- }
- }
-
- return 0;
-}
-
static void ccid3_hc_rx_send_feedback(struct sock *sk)
{
+ struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk);
struct dccp_sock *dp = dccp_sk(sk);
- struct ccid3_hc_rx_sock *hcrx = dp->dccps_hc_rx_ccid_private;
struct dccp_rx_hist_entry *packet;
+ struct timeval now;
ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk);
+ dccp_timestamp(sk, &now);
+
switch (hcrx->ccid3hcrx_state) {
case TFRC_RSTATE_NO_DATA:
hcrx->ccid3hcrx_x_recv = 0;
break;
case TFRC_RSTATE_DATA: {
- u32 delta = now_delta(hcrx->ccid3hcrx_tstamp_last_feedback);
-
- if (delta == 0)
- delta = 1; /* to prevent divide by zero */
- hcrx->ccid3hcrx_x_recv = (hcrx->ccid3hcrx_bytes_recv *
- USEC_PER_SEC) / delta;
+ const u32 delta = timeval_delta(&now,
+ &hcrx->ccid3hcrx_tstamp_last_feedback);
+ hcrx->ccid3hcrx_x_recv = usecs_div(hcrx->ccid3hcrx_bytes_recv,
+ delta);
}
break;
default:
return;
}
- do_gettimeofday(&(hcrx->ccid3hcrx_tstamp_last_feedback));
+ hcrx->ccid3hcrx_tstamp_last_feedback = now;
hcrx->ccid3hcrx_last_counter = packet->dccphrx_ccval;
hcrx->ccid3hcrx_seqno_last_counter = packet->dccphrx_seqno;
hcrx->ccid3hcrx_bytes_recv = 0;
/* Convert to multiples of 10us */
- hcrx->ccid3hcrx_elapsed_time = now_delta(packet->dccphrx_tstamp) / 10;
+ hcrx->ccid3hcrx_elapsed_time =
+ timeval_delta(&now, &packet->dccphrx_tstamp) / 10;
if (hcrx->ccid3hcrx_p == 0)
hcrx->ccid3hcrx_pinv = ~0;
else
hcrx->ccid3hcrx_pinv = 1000000 / hcrx->ccid3hcrx_p;
+ dp->dccps_hc_rx_insert_options = 1;
dccp_send_ack(sk);
}
static void ccid3_hc_rx_insert_options(struct sock *sk, struct sk_buff *skb)
{
- const struct dccp_sock *dp = dccp_sk(sk);
+ struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_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))
+ if (hcrx == NULL || !(sk->sk_state == DCCP_OPEN ||
+ sk->sk_state == DCCP_PARTOPEN))
return;
DCCP_SKB_CB(skb)->dccpd_ccval = hcrx->ccid3hcrx_last_counter;
&x_recv, sizeof(x_recv));
}
-/* Weights used to calculate loss event rate */
-/*
- * These are integers as per section 8 of RFC3448. We can then divide by 4 *
- * when we use it.
- */
-static const int ccid3_hc_rx_w[TFRC_RECV_IVAL_F_LENGTH] = {
- 4, 4, 4, 4, 3, 2, 1, 1,
-};
-
-/*
- * args: fvalue - function value to match
- * returns: p closest to that value
- *
- * both fvalue and p are multiplied by 1,000,000 to use ints
- */
-static u32 calcx_reverse_lookup(u32 fvalue) {
- int ctr = 0;
- int small;
-
- if (fvalue < calcx_lookup[0][1])
- return 0;
- if (fvalue <= calcx_lookup[CALCX_ARRSIZE-1][1])
- small = 1;
- else if (fvalue > calcx_lookup[CALCX_ARRSIZE-1][0])
- return 1000000;
- else
- small = 0;
- while (fvalue > calcx_lookup[ctr][small])
- ctr++;
- if (small)
- return (CALCX_SPLIT * ctr / CALCX_ARRSIZE);
- else
- return (1000000 * ctr / CALCX_ARRSIZE) ;
-}
-
/* calculate first loss interval
*
* returns estimated loss interval in usecs */
static u32 ccid3_hc_rx_calc_first_li(struct sock *sk)
{
- struct dccp_sock *dp = dccp_sk(sk);
- struct ccid3_hc_rx_sock *hcrx = dp->dccps_hc_rx_ccid_private;
+ struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk);
struct dccp_rx_hist_entry *entry, *next, *tail = NULL;
u32 rtt, delta, x_recv, fval, p, tmp2;
- struct timeval tstamp = { 0 }, tmp_tv;
+ struct timeval tstamp = { 0, };
int interval = 0;
int win_count = 0;
int step = 0;
}
if (step == 0) {
- printk(KERN_CRIT "%s: %s, sk=%p, packet history contains no data packets!\n",
+ printk(KERN_CRIT "%s: %s, sk=%p, packet history contains no "
+ "data packets!\n",
__FUNCTION__, dccp_role(sk), sk);
return ~0;
}
if (interval == 0) {
- ccid3_pr_debug("%s, sk=%p, Could not find a win_count interval > 0. Defaulting to 1\n",
+ ccid3_pr_debug("%s, sk=%p, Could not find a win_count "
+ "interval > 0. Defaulting to 1\n",
dccp_role(sk), sk);
interval = 1;
}
found:
- timeval_sub(tstamp,tail->dccphrx_tstamp,&tmp_tv);
- rtt = (tmp_tv.tv_sec * USEC_PER_SEC + tmp_tv.tv_usec) * 4 / interval;
+ rtt = timeval_delta(&tstamp, &tail->dccphrx_tstamp) * 4 / interval;
ccid3_pr_debug("%s, sk=%p, approximated RTT to %uus\n",
dccp_role(sk), sk, rtt);
if (rtt == 0)
rtt = 1;
- delta = now_delta(hcrx->ccid3hcrx_tstamp_last_feedback);
- if (delta == 0)
- delta = 1;
-
- x_recv = (hcrx->ccid3hcrx_bytes_recv * USEC_PER_SEC) / delta;
+ dccp_timestamp(sk, &tstamp);
+ delta = timeval_delta(&tstamp, &hcrx->ccid3hcrx_tstamp_last_feedback);
+ x_recv = usecs_div(hcrx->ccid3hcrx_bytes_recv, delta);
tmp1 = (u64)x_recv * (u64)rtt;
do_div(tmp1,10000000);
tmp2 = (u32)tmp1;
fval = (hcrx->ccid3hcrx_s * 100000) / tmp2;
/* do not alter order above or you will get overflow on 32 bit */
- p = calcx_reverse_lookup(fval);
- ccid3_pr_debug("%s, sk=%p, receive rate=%u bytes/s, implied loss rate=%u\n",\
- dccp_role(sk), sk, x_recv, p);
+ p = tfrc_calc_x_reverse_lookup(fval);
+ ccid3_pr_debug("%s, sk=%p, receive rate=%u bytes/s, implied "
+ "loss rate=%u\n", dccp_role(sk), sk, x_recv, p);
if (p == 0)
return ~0;
static void ccid3_hc_rx_update_li(struct sock *sk, u64 seq_loss, u8 win_loss)
{
- struct dccp_sock *dp = dccp_sk(sk);
- struct ccid3_hc_rx_sock *hcrx = dp->dccps_hc_rx_ccid_private;
- struct ccid3_loss_interval_hist_entry *li_entry;
+ struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk);
- if (seq_loss != DCCP_MAX_SEQNO + 1) {
- ccid3_pr_debug("%s, sk=%p, seq_loss=%llu, win_loss=%u, packet loss detected\n",
- dccp_role(sk), sk, seq_loss, win_loss);
-
- if (list_empty(&hcrx->ccid3hcrx_loss_interval_hist)) {
- struct ccid3_loss_interval_hist_entry *li_tail = NULL;
- int i;
-
- ccid3_pr_debug("%s, sk=%p, first loss event detected, creating history\n", dccp_role(sk), sk);
- for (i = 0; i <= TFRC_RECV_IVAL_F_LENGTH; ++i) {
- li_entry = ccid3_loss_interval_hist_entry_new(SLAB_ATOMIC);
- if (li_entry == NULL) {
- ccid3_loss_interval_history_delete(&hcrx->ccid3hcrx_loss_interval_hist);
- ccid3_pr_debug("%s, sk=%p, not enough mem for creating history\n",
- dccp_role(sk), sk);
- return;
- }
- if (li_tail == NULL)
- li_tail = li_entry;
- list_add(&li_entry->ccid3lih_node, &hcrx->ccid3hcrx_loss_interval_hist);
- }
+ if (seq_loss != DCCP_MAX_SEQNO + 1 &&
+ list_empty(&hcrx->ccid3hcrx_li_hist)) {
+ struct dccp_li_hist_entry *li_tail;
- li_entry->ccid3lih_seqno = seq_loss;
- li_entry->ccid3lih_win_count = win_loss;
-
- li_tail->ccid3lih_interval = ccid3_hc_rx_calc_first_li(sk);
- }
+ li_tail = dccp_li_hist_interval_new(ccid3_li_hist,
+ &hcrx->ccid3hcrx_li_hist,
+ seq_loss, win_loss);
+ if (li_tail == NULL)
+ return;
+ li_tail->dccplih_interval = ccid3_hc_rx_calc_first_li(sk);
}
/* FIXME: find end of interval */
}
static void ccid3_hc_rx_detect_loss(struct sock *sk)
{
- struct dccp_sock *dp = dccp_sk(sk);
- struct ccid3_hc_rx_sock *hcrx = dp->dccps_hc_rx_ccid_private;
- struct dccp_rx_hist_entry *entry, *next, *packet;
- struct dccp_rx_hist_entry *a_loss = NULL;
- struct dccp_rx_hist_entry *b_loss = NULL;
- u64 seq_loss = DCCP_MAX_SEQNO + 1;
- u8 win_loss = 0;
- u8 num_later = TFRC_RECV_NUM_LATE_LOSS;
+ struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk);
+ u8 win_loss;
+ const u64 seq_loss = dccp_rx_hist_detect_loss(&hcrx->ccid3hcrx_hist,
+ &hcrx->ccid3hcrx_li_hist,
+ &win_loss);
- list_for_each_entry_safe(entry, next, &hcrx->ccid3hcrx_hist,
- dccphrx_node) {
- if (num_later == 0) {
- b_loss = entry;
- break;
- } else if (dccp_rx_hist_entry_data_packet(entry))
- --num_later;
- }
-
- if (b_loss == NULL)
- goto out_update_li;
-
- num_later = 1;
-
- list_for_each_entry_safe_continue(entry, next, &hcrx->ccid3hcrx_hist,
- dccphrx_node) {
- if (num_later == 0) {
- a_loss = entry;
- break;
- } else if (dccp_rx_hist_entry_data_packet(entry))
- --num_later;
- }
-
- if (a_loss == NULL) {
- if (list_empty(&hcrx->ccid3hcrx_loss_interval_hist)) {
- /* no loss event have occured yet */
- ccid3_pr_debug("%s, sk=%p, TODO: find a lost data "
- "packet by comparing to initial seqno\n",
- dccp_role(sk), sk);
- goto out_update_li;
- } else {
- pr_info("%s: %s, sk=%p, ERROR! Less than 4 data packets in history",
- __FUNCTION__, dccp_role(sk), sk);
- return;
- }
- }
-
- /* Locate a lost data packet */
- entry = packet = b_loss;
- list_for_each_entry_safe_continue(entry, next, &hcrx->ccid3hcrx_hist,
- dccphrx_node) {
- u64 delta = dccp_delta_seqno(entry->dccphrx_seqno,
- packet->dccphrx_seqno);
-
- if (delta != 0) {
- if (dccp_rx_hist_entry_data_packet(packet))
- --delta;
- /*
- * FIXME: check this, probably this % usage is because
- * in earlier drafts the ndp count was just 8 bits
- * long, but now it cam be up to 24 bits long.
- */
-#if 0
- if (delta % DCCP_NDP_LIMIT !=
- (packet->dccphrx_ndp -
- entry->dccphrx_ndp) % DCCP_NDP_LIMIT)
-#endif
- if (delta !=
- packet->dccphrx_ndp - entry->dccphrx_ndp) {
- seq_loss = entry->dccphrx_seqno;
- dccp_inc_seqno(&seq_loss);
- }
- }
- packet = entry;
- if (packet == a_loss)
- break;
- }
-
- if (seq_loss != DCCP_MAX_SEQNO + 1)
- win_loss = a_loss->dccphrx_ccval;
-
-out_update_li:
ccid3_hc_rx_update_li(sk, seq_loss, win_loss);
}
-static u32 ccid3_hc_rx_calc_i_mean(struct sock *sk)
-{
- struct dccp_sock *dp = dccp_sk(sk);
- struct ccid3_hc_rx_sock *hcrx = dp->dccps_hc_rx_ccid_private;
- struct ccid3_loss_interval_hist_entry *li_entry, *li_next;
- int i = 0;
- u32 i_tot;
- u32 i_tot0 = 0;
- u32 i_tot1 = 0;
- u32 w_tot = 0;
-
- list_for_each_entry_safe(li_entry, li_next, &hcrx->ccid3hcrx_loss_interval_hist, ccid3lih_node) {
- if (i < TFRC_RECV_IVAL_F_LENGTH) {
- i_tot0 += li_entry->ccid3lih_interval * ccid3_hc_rx_w[i];
- w_tot += ccid3_hc_rx_w[i];
- }
-
- if (i != 0)
- i_tot1 += li_entry->ccid3lih_interval * ccid3_hc_rx_w[i - 1];
-
- if (++i > TFRC_RECV_IVAL_F_LENGTH)
- break;
- }
-
- if (i != TFRC_RECV_IVAL_F_LENGTH) {
- pr_info("%s: %s, sk=%p, ERROR! Missing entry in interval history!\n",
- __FUNCTION__, dccp_role(sk), sk);
- return 0;
- }
-
- i_tot = max(i_tot0, i_tot1);
-
- /* FIXME: Why do we do this? -Ian McDonald */
- if (i_tot * 4 < w_tot)
- i_tot = w_tot * 4;
-
- return i_tot * 4 / w_tot;
-}
-
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;
+ struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk);
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;
+ u32 p_prev, r_sample, t_elapsed;
int ins;
-#if 0
- ccid3_pr_debug("%s, sk=%p(%s), skb=%p(%s)\n",
- dccp_role(sk), sk, dccp_state_name(sk->sk_state),
- skb, dccp_packet_name(DCCP_SKB_CB(skb)->dccpd_type));
-#endif
+
if (hcrx == NULL)
return;
BUG_ON(!(hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA ||
hcrx->ccid3hcrx_state == TFRC_RSTATE_DATA));
- opt_recv = &dp->dccps_options_received;
+ opt_recv = &dccp_sk(sk)->dccps_options_received;
switch (DCCP_SKB_CB(skb)->dccpd_type) {
case DCCP_PKT_ACK:
if (opt_recv->dccpor_timestamp_echo == 0)
break;
p_prev = hcrx->ccid3hcrx_rtt;
- do_gettimeofday(&now);
- 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;
+ dccp_timestamp(sk, &now);
+ timeval_sub_usecs(&now, opt_recv->dccpor_timestamp_echo * 10);
+ r_sample = timeval_usecs(&now);
+ t_elapsed = opt_recv->dccpor_elapsed_time * 10;
+
+ if (unlikely(r_sample <= t_elapsed))
+ LIMIT_NETDEBUG(KERN_WARNING
+ "%s: r_sample=%uus, t_elapsed=%uus\n",
+ __FUNCTION__, r_sample, t_elapsed);
+ else
+ r_sample -= t_elapsed;
+
+ if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA)
+ hcrx->ccid3hcrx_rtt = r_sample;
+ else
+ hcrx->ccid3hcrx_rtt = (hcrx->ccid3hcrx_rtt * 9) / 10 +
+ r_sample / 10;
+
if (p_prev != hcrx->ccid3hcrx_rtt)
ccid3_pr_debug("%s, New RTT=%luus, elapsed time=%u\n",
dccp_role(sk), hcrx->ccid3hcrx_rtt,
return;
}
- packet = dccp_rx_hist_entry_new(ccid3_rx_hist, opt_recv->dccpor_ndp,
+ packet = dccp_rx_hist_entry_new(ccid3_rx_hist, sk, 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)!",
+ ccid3_pr_debug("%s, sk=%p, Not enough mem to add rx packet "
+ "to history (consider it lost)!",
dccp_role(sk), sk);
return;
}
win_count = packet->dccphrx_ccval;
- ins = ccid3_hc_rx_add_hist(sk, packet);
+ ins = dccp_rx_hist_add_packet(ccid3_rx_hist, &hcrx->ccid3hcrx_hist,
+ &hcrx->ccid3hcrx_li_hist, packet);
if (DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_ACK)
return;
switch (hcrx->ccid3hcrx_state) {
case TFRC_RSTATE_NO_DATA:
- ccid3_pr_debug("%s, sk=%p(%s), skb=%p, sending initial feedback\n",
- dccp_role(sk), sk, dccp_state_name(sk->sk_state), skb);
+ ccid3_pr_debug("%s, sk=%p(%s), skb=%p, sending initial "
+ "feedback\n",
+ dccp_role(sk), sk,
+ dccp_state_name(sk->sk_state), skb);
ccid3_hc_rx_send_feedback(sk);
ccid3_hc_rx_set_state(sk, TFRC_RSTATE_DATA);
return;
case TFRC_RSTATE_DATA:
- hcrx->ccid3hcrx_bytes_recv += skb->len - dccp_hdr(skb)->dccph_doff * 4;
- if (ins == 0) {
- 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;
+ hcrx->ccid3hcrx_bytes_recv += skb->len -
+ dccp_hdr(skb)->dccph_doff * 4;
+ if (ins != 0)
+ break;
+
+ dccp_timestamp(sk, &now);
+ if (timeval_delta(&now, &hcrx->ccid3hcrx_tstamp_last_ack) >=
+ hcrx->ccid3hcrx_rtt) {
+ hcrx->ccid3hcrx_tstamp_last_ack = now;
+ ccid3_hc_rx_send_feedback(sk);
}
- break;
+ return;
default:
printk(KERN_CRIT "%s: %s, sk=%p, Illegal state (%d)!\n",
__FUNCTION__, dccp_role(sk), sk, hcrx->ccid3hcrx_state);
p_prev = hcrx->ccid3hcrx_p;
/* Calculate loss event rate */
- if (!list_empty(&hcrx->ccid3hcrx_loss_interval_hist))
+ if (!list_empty(&hcrx->ccid3hcrx_li_hist))
/* Scaling up by 1000000 as fixed decimal */
- hcrx->ccid3hcrx_p = 1000000 / ccid3_hc_rx_calc_i_mean(sk);
+ hcrx->ccid3hcrx_p = 1000000 / dccp_li_hist_calc_i_mean(&hcrx->ccid3hcrx_li_hist);
if (hcrx->ccid3hcrx_p > p_prev) {
ccid3_hc_rx_send_feedback(sk);
ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk);
- hcrx = dp->dccps_hc_rx_ccid_private = kmalloc(sizeof(*hcrx), gfp_any());
- if (hcrx == NULL)
+ dp->dccps_hc_rx_ccid_private = kmalloc(sizeof(*hcrx), gfp_any());
+ if (dp->dccps_hc_rx_ccid_private == NULL)
return -ENOMEM;
+ hcrx = ccid3_hc_rx_sk(sk);
memset(hcrx, 0, sizeof(*hcrx));
- if (dp->dccps_avg_packet_size >= TFRC_MIN_PACKET_SIZE &&
- dp->dccps_avg_packet_size <= TFRC_MAX_PACKET_SIZE)
- hcrx->ccid3hcrx_s = (u16)dp->dccps_avg_packet_size;
+ if (dp->dccps_packet_size >= TFRC_MIN_PACKET_SIZE &&
+ dp->dccps_packet_size <= TFRC_MAX_PACKET_SIZE)
+ hcrx->ccid3hcrx_s = dp->dccps_packet_size;
else
hcrx->ccid3hcrx_s = TFRC_STD_PACKET_SIZE;
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;
+ INIT_LIST_HEAD(&hcrx->ccid3hcrx_li_hist);
+ dccp_timestamp(sk, &hcrx->ccid3hcrx_tstamp_last_ack);
+ hcrx->ccid3hcrx_tstamp_last_feedback = hcrx->ccid3hcrx_tstamp_last_ack;
+ hcrx->ccid3hcrx_rtt = 5000; /* XXX 5ms for now... */
return 0;
}
static void ccid3_hc_rx_exit(struct sock *sk)
{
+ struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk);
struct dccp_sock *dp = dccp_sk(sk);
- struct ccid3_hc_rx_sock *hcrx = dp->dccps_hc_rx_ccid_private;
ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk);
dccp_rx_hist_purge(ccid3_rx_hist, &hcrx->ccid3hcrx_hist);
/* Empty loss interval history */
- ccid3_loss_interval_history_delete(&hcrx->ccid3hcrx_loss_interval_hist);
+ dccp_li_hist_purge(ccid3_li_hist, &hcrx->ccid3hcrx_li_hist);
kfree(dp->dccps_hc_rx_ccid_private);
dp->dccps_hc_rx_ccid_private = NULL;
}
+static void ccid3_hc_rx_get_info(struct sock *sk, struct tcp_info *info)
+{
+ const struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk);
+
+ if (hcrx == NULL)
+ return;
+
+ info->tcpi_ca_state = hcrx->ccid3hcrx_state;
+ info->tcpi_options |= TCPI_OPT_TIMESTAMPS;
+ info->tcpi_rcv_rtt = hcrx->ccid3hcrx_rtt;
+}
+
+static void ccid3_hc_tx_get_info(struct sock *sk, struct tcp_info *info)
+{
+ const struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
+
+ if (hctx == NULL)
+ return;
+
+ info->tcpi_rto = hctx->ccid3hctx_t_rto;
+ info->tcpi_rtt = hctx->ccid3hctx_rtt;
+}
+
static struct ccid ccid3 = {
.ccid_id = 3,
.ccid_name = "ccid3",
.ccid_hc_rx_exit = ccid3_hc_rx_exit,
.ccid_hc_rx_insert_options = ccid3_hc_rx_insert_options,
.ccid_hc_rx_packet_recv = ccid3_hc_rx_packet_recv,
+ .ccid_hc_rx_get_info = ccid3_hc_rx_get_info,
+ .ccid_hc_tx_get_info = ccid3_hc_tx_get_info,
};
module_param(ccid3_debug, int, 0444);
if (ccid3_tx_hist == NULL)
goto out_free_rx;
- ccid3_loss_interval_hist_slab = kmem_cache_create("li_hist_ccid3",
- sizeof(struct ccid3_loss_interval_hist_entry),
- 0, SLAB_HWCACHE_ALIGN,
- NULL, NULL);
- if (ccid3_loss_interval_hist_slab == NULL)
+ ccid3_li_hist = dccp_li_hist_new("ccid3");
+ if (ccid3_li_hist == NULL)
goto out_free_tx;
rc = ccid_register(&ccid3);
return rc;
out_free_loss_interval_history:
- kmem_cache_destroy(ccid3_loss_interval_hist_slab);
- ccid3_loss_interval_hist_slab = NULL;
+ dccp_li_hist_delete(ccid3_li_hist);
+ ccid3_li_hist = NULL;
out_free_tx:
dccp_tx_hist_delete(ccid3_tx_hist);
ccid3_tx_hist = NULL;
dccp_rx_hist_delete(ccid3_rx_hist);
ccid3_rx_hist = NULL;
}
- if (ccid3_loss_interval_hist_slab != NULL) {
- kmem_cache_destroy(ccid3_loss_interval_hist_slab);
- ccid3_loss_interval_hist_slab = NULL;
+ if (ccid3_li_hist != NULL) {
+ dccp_li_hist_delete(ccid3_li_hist);
+ ccid3_li_hist = NULL;
}
}
module_exit(ccid3_module_exit);
-MODULE_AUTHOR("Ian McDonald <iam4@cs.waikato.ac.nz> & Arnaldo Carvalho de Melo <acme@ghostprotocols.net>");
+MODULE_AUTHOR("Ian McDonald <iam4@cs.waikato.ac.nz>, "
+ "Arnaldo Carvalho de Melo <acme@ghostprotocols.net>");
MODULE_DESCRIPTION("DCCP TFRC CCID3 CCID");
MODULE_LICENSE("GPL");
MODULE_ALIAS("net-dccp-ccid-3");
git.samba.org / sfrench / cifs-2.6.git / blobdiff