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Message-Id: <1206462011-24907-4-git-send-email-gerrit@erg.abdn.ac.uk>
Date: Tue, 25 Mar 2008 16:20:07 +0000
From: Gerrit Renker <gerrit@....abdn.ac.uk>
To: acme@...hat.com
Cc: dccp@...r.kernel.org, netdev@...r.kernel.org,
Gerrit Renker <gerrit@....abdn.ac.uk>
Subject: [PATCH 3/7] [RFC] [CCID-3]: Get rid of ccid3hc{tx,rx}_ prefixes
Arnaldo can you please check if you are ok with this - it is a follow-up
to the earlier patch, for consistency.
--------------------------> Patch <-----------------------------------------
This continues work done in an earlier patch for CCID-2, where there was
agreement on dccp@...r that the `hctx->ccid3hctx_' prefixes were too long.
Thus this patch does the same for CCID-3 as the previous patch for CCID-2:
s#ccid3hctx_##g;
s#ccid3hcrx_##g;
plus manual editing to retain consistency (updated comments, moved assignment
within an `if' expression into standalone expression).
As in the previous patch, the code becomes much clearer to read, and many
multi-line expressions are reduced in size.
Note: expanded the fields of the `struct tfrc_tx_info' in the hc_tx_sock, since
using short #define identifiers is not a good idea. The only place where
this embedded struct was used is ccid3_hc_tx_getsockopt().
(It may be that removing the embedded struct allows to reduce the size of
the socket, by re-arranging fields; I haven't checked this.)
Signed-off-by: Gerrit Renker <gerrit@....abdn.ac.uk>
---
net/dccp/ccids/ccid3.c | 335 +++++++++++++++++++++++--------------------------
net/dccp/ccids/ccid3.h | 119 ++++++++---------
net/dccp/probe.c | 8 -
3 files changed, 221 insertions(+), 241 deletions(-)
--- a/net/dccp/ccids/ccid3.h
+++ b/net/dccp/ccids/ccid3.h
@@ -77,44 +77,43 @@ enum ccid3_hc_tx_states {
/** struct ccid3_hc_tx_sock - CCID3 sender half-connection socket
*
- * @ccid3hctx_x - Current sending rate in 64 * bytes per second
- * @ccid3hctx_x_recv - Receive rate in 64 * bytes per second
- * @ccid3hctx_x_calc - Calculated rate in bytes per second
- * @ccid3hctx_rtt - Estimate of current round trip time in usecs
- * @ccid3hctx_p - Current loss event rate (0-1) scaled by 1000000
- * @ccid3hctx_s - Packet size in bytes
- * @ccid3hctx_t_rto - Nofeedback Timer setting in usecs
- * @ccid3hctx_t_ipi - Interpacket (send) interval (RFC 3448, 4.6) in usecs
- * @ccid3hctx_state - Sender state, one of %ccid3_hc_tx_states
- * @ccid3hctx_last_win_count - Last window counter sent
- * @ccid3hctx_t_last_win_count - Timestamp of earliest packet
- * with last_win_count value sent
- * @ccid3hctx_no_feedback_timer - Handle to no feedback timer
- * @ccid3hctx_t_ld - Time last doubled during slow start
- * @ccid3hctx_t_nom - Nominal send time of next packet
- * @ccid3hctx_delta - Send timer delta (RFC 3448, 4.6) in usecs
- * @ccid3hctx_hist - Packet history
- * @ccid3hctx_options_received - Parsed set of retrieved options
+ * @x - Current sending rate in 64 * bytes per second
+ * @x_recv - Receive rate in 64 * bytes per second
+ * @x_calc - Calculated rate in bytes per second
+ * @rtt - Estimate of current round trip time in usecs
+ * @p - Current loss event rate (0-1) scaled by 1000000
+ * @s - Packet size in bytes
+ * @t_rto - Nofeedback Timer setting in usecs
+ * @t_ipi - Interpacket (send) interval (RFC 3448, 4.6) in usecs
+ * @state - Sender state, one of %ccid3_hc_tx_states
+ * @last_win_count - Last window counter sent
+ * @t_last_win_count - Timestamp of earliest packet with
+ * last_win_count value sent
+ * @no_feedback_timer - Handle to no feedback timer
+ * @t_ld - Time last doubled during slow start
+ * @t_nom - Nominal send time of next packet
+ * @delta - Send timer delta (RFC 3448, 4.6) in usecs
+ * @hist - Packet history
+ * @options_received - Parsed set of retrieved options
*/
struct ccid3_hc_tx_sock {
- struct tfrc_tx_info ccid3hctx_tfrc;
-#define ccid3hctx_x ccid3hctx_tfrc.tfrctx_x
-#define ccid3hctx_x_recv ccid3hctx_tfrc.tfrctx_x_recv
-#define ccid3hctx_x_calc ccid3hctx_tfrc.tfrctx_x_calc
-#define ccid3hctx_rtt ccid3hctx_tfrc.tfrctx_rtt
-#define ccid3hctx_p ccid3hctx_tfrc.tfrctx_p
-#define ccid3hctx_t_rto ccid3hctx_tfrc.tfrctx_rto
-#define ccid3hctx_t_ipi ccid3hctx_tfrc.tfrctx_ipi
- u16 ccid3hctx_s;
- enum ccid3_hc_tx_states ccid3hctx_state:8;
- u8 ccid3hctx_last_win_count;
- ktime_t ccid3hctx_t_last_win_count;
- struct timer_list ccid3hctx_no_feedback_timer;
- ktime_t ccid3hctx_t_ld;
- ktime_t ccid3hctx_t_nom;
- u32 ccid3hctx_delta;
- struct tfrc_tx_hist_entry *ccid3hctx_hist;
- struct ccid3_options_received ccid3hctx_options_received;
+ u64 x;
+ u64 x_recv;
+ u32 x_calc;
+ u32 rtt;
+ u32 p;
+ u32 t_rto;
+ u32 t_ipi;
+ u16 s;
+ enum ccid3_hc_tx_states state:8;
+ u8 last_win_count;
+ ktime_t t_last_win_count;
+ struct timer_list no_feedback_timer;
+ ktime_t t_ld;
+ ktime_t t_nom;
+ u32 delta;
+ struct tfrc_tx_hist_entry *hist;
+ struct ccid3_options_received options_received;
};
static inline struct ccid3_hc_tx_sock *ccid3_hc_tx_sk(const struct sock *sk)
@@ -133,32 +132,32 @@ enum ccid3_hc_rx_states {
/** struct ccid3_hc_rx_sock - CCID3 receiver half-connection socket
*
- * @ccid3hcrx_x_recv - Receiver estimate of send rate (RFC 3448 4.3)
- * @ccid3hcrx_rtt - Receiver estimate of rtt (non-standard)
- * @ccid3hcrx_p - Current loss event rate (RFC 3448 5.4)
- * @ccid3hcrx_last_counter - Tracks window counter (RFC 4342, 8.1)
- * @ccid3hcrx_state - Receiver state, one of %ccid3_hc_rx_states
- * @ccid3hcrx_bytes_recv - Total sum of DCCP payload bytes
- * @ccid3hcrx_x_recv - Receiver estimate of send rate (RFC 3448, sec. 4.3)
- * @ccid3hcrx_rtt - Receiver estimate of RTT
- * @ccid3hcrx_tstamp_last_feedback - Time at which last feedback was sent
- * @ccid3hcrx_tstamp_last_ack - Time at which last feedback was sent
- * @ccid3hcrx_hist - Packet history (loss detection + RTT sampling)
- * @ccid3hcrx_li_hist - Loss Interval database
- * @ccid3hcrx_s - Received packet size in bytes
- * @ccid3hcrx_pinv - Inverse of Loss Event Rate (RFC 4342, sec. 8.5)
+ * @x_recv - Receiver estimate of send rate (RFC 3448 4.3)
+ * @rtt - Receiver estimate of rtt (non-standard)
+ * @p - Current loss event rate (RFC 3448 5.4)
+ * @last_counter - Tracks window counter (RFC 4342, 8.1)
+ * @state - Receiver state, one of %ccid3_hc_rx_states
+ * @bytes_recv - Total sum of DCCP payload bytes
+ * @x_recv - Receiver estimate of send rate (RFC 3448, sec. 4.3)
+ * @rtt - Receiver estimate of RTT
+ * @tstamp_last_feedback - Time at which last feedback was sent
+ * @tstamp_last_ack - Time at which last feedback was sent
+ * @hist - Packet history (loss detection + RTT sampling)
+ * @li_hist - Loss Interval database
+ * @s - Received packet size in bytes
+ * @p_inverse - Inverse of Loss Event Rate (RFC 4342, sec. 8.5)
*/
struct ccid3_hc_rx_sock {
- u8 ccid3hcrx_last_counter:4;
- enum ccid3_hc_rx_states ccid3hcrx_state:8;
- u32 ccid3hcrx_bytes_recv;
- u32 ccid3hcrx_x_recv;
- u32 ccid3hcrx_rtt;
- ktime_t ccid3hcrx_tstamp_last_feedback;
- struct tfrc_rx_hist ccid3hcrx_hist;
- struct tfrc_loss_hist ccid3hcrx_li_hist;
- u16 ccid3hcrx_s;
-#define ccid3hcrx_pinv ccid3hcrx_li_hist.i_mean
+ u8 last_counter:4;
+ enum ccid3_hc_rx_states state:8;
+ u32 bytes_recv;
+ u32 x_recv;
+ u32 rtt;
+ ktime_t tstamp_last_feedback;
+ struct tfrc_rx_hist hist;
+ struct tfrc_loss_hist li_hist;
+ u16 s;
+#define p_inverse li_hist.i_mean
};
static inline struct ccid3_hc_rx_sock *ccid3_hc_rx_sk(const struct sock *sk)
--- a/net/dccp/ccids/ccid3.c
+++ b/net/dccp/ccids/ccid3.c
@@ -67,13 +67,13 @@ static void ccid3_hc_tx_set_state(struct
enum ccid3_hc_tx_states state)
{
struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
- enum ccid3_hc_tx_states oldstate = hctx->ccid3hctx_state;
+ enum ccid3_hc_tx_states oldstate = hctx->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->ccid3hctx_state = state;
+ hctx->state = state;
}
/*
@@ -88,10 +88,10 @@ static void ccid3_hc_tx_set_state(struct
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 = min_t(__u32, 4 * hctx->ccid3hctx_s,
- max_t(__u32, 2 * hctx->ccid3hctx_s, 4380));
+ const u32 w_init = min_t(u32, 4 * hctx->s,
+ max_t(u32, 2 * hctx->s, 4380U));
- return scaled_div(w_init << 6, hctx->ccid3hctx_rtt);
+ return scaled_div(w_init << 6, hctx->rtt);
}
/*
@@ -100,24 +100,21 @@ static inline u64 rfc3390_initial_rate(s
static void ccid3_update_send_interval(struct ccid3_hc_tx_sock *hctx)
{
/* Calculate new t_ipi = s / X_inst (X_inst is in 64 * bytes/second) */
- hctx->ccid3hctx_t_ipi = scaled_div32(((u64)hctx->ccid3hctx_s) << 6,
- hctx->ccid3hctx_x);
+ hctx->t_ipi = scaled_div32(((u64)hctx->s) << 6, hctx->x);
/* Calculate new delta by delta = min(t_ipi / 2, t_gran / 2) */
- hctx->ccid3hctx_delta = min_t(u32, hctx->ccid3hctx_t_ipi / 2,
- TFRC_OPSYS_HALF_TIME_GRAN);
+ hctx->delta = min_t(u32, hctx->t_ipi / 2, TFRC_OPSYS_HALF_TIME_GRAN);
- ccid3_pr_debug("t_ipi=%u, delta=%u, s=%u, X=%u\n",
- hctx->ccid3hctx_t_ipi, hctx->ccid3hctx_delta,
- hctx->ccid3hctx_s, (unsigned)(hctx->ccid3hctx_x >> 6));
+ ccid3_pr_debug("t_ipi=%u, delta=%u, s=%u, X=%u\n", hctx->t_ipi,
+ hctx->delta, hctx->s, (unsigned)(hctx->x >> 6));
}
static u32 ccid3_hc_tx_idle_rtt(struct ccid3_hc_tx_sock *hctx, ktime_t now)
{
- u32 delta = ktime_us_delta(now, hctx->ccid3hctx_t_last_win_count);
+ u32 delta = ktime_us_delta(now, hctx->t_last_win_count);
- return delta / hctx->ccid3hctx_rtt;
+ return delta / hctx->rtt;
}
/**
@@ -133,8 +130,8 @@ static u32 ccid3_hc_tx_idle_rtt(struct c
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->ccid3hctx_x_recv;
- const __u64 old_x = hctx->ccid3hctx_x;
+ u64 min_rate = 2 * hctx->x_recv;
+ const u64 old_x = hctx->x;
ktime_t now = stamp ? *stamp : ktime_get_real();
/*
@@ -145,33 +142,26 @@ static void ccid3_hc_tx_update_x(struct
*/
if (ccid3_hc_tx_idle_rtt(hctx, now) >= 2) {
min_rate = rfc3390_initial_rate(sk);
- min_rate = max(min_rate, 2 * hctx->ccid3hctx_x_recv);
+ min_rate = max(min_rate, 2 * hctx->x_recv);
}
- if (hctx->ccid3hctx_p > 0) {
+ if (hctx->p > 0) {
- hctx->ccid3hctx_x = min(((__u64)hctx->ccid3hctx_x_calc) << 6,
- min_rate);
- hctx->ccid3hctx_x = max(hctx->ccid3hctx_x,
- (((__u64)hctx->ccid3hctx_s) << 6) /
- TFRC_T_MBI);
+ hctx->x = min(((u64)hctx->x_calc) << 6, min_rate);
+ hctx->x = max(hctx->x, (((u64)hctx->s) << 6) / TFRC_T_MBI);
- } else if (ktime_us_delta(now, hctx->ccid3hctx_t_ld)
- - (s64)hctx->ccid3hctx_rtt >= 0) {
+ } else if (ktime_us_delta(now, hctx->t_ld) - (s64)hctx->rtt >= 0) {
- hctx->ccid3hctx_x =
- max(min(2 * hctx->ccid3hctx_x, min_rate),
- scaled_div(((__u64)hctx->ccid3hctx_s) << 6,
- hctx->ccid3hctx_rtt));
- hctx->ccid3hctx_t_ld = now;
+ hctx->x = max(min(2 * hctx->x, min_rate),
+ scaled_div(((u64)hctx->s) << 6, hctx->rtt));
+ hctx->t_ld = now;
}
- if (hctx->ccid3hctx_x != old_x) {
+ if (hctx->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->ccid3hctx_x >> 6),
- hctx->ccid3hctx_x_calc,
- (unsigned)(hctx->ccid3hctx_x_recv >> 6));
+ (unsigned)(hctx->x >> 6), hctx->x_calc,
+ (unsigned)(hctx->x_recv >> 6));
ccid3_update_send_interval(hctx);
}
@@ -183,11 +173,11 @@ static void ccid3_hc_tx_update_x(struct
*/
static inline void ccid3_hc_tx_update_s(struct ccid3_hc_tx_sock *hctx, int len)
{
- const u16 old_s = hctx->ccid3hctx_s;
+ const u16 old_s = hctx->s;
- hctx->ccid3hctx_s = tfrc_ewma(hctx->ccid3hctx_s, len, 9);
+ hctx->s = tfrc_ewma(hctx->s, len, 9);
- if (hctx->ccid3hctx_s != old_s)
+ if (hctx->s != old_s)
ccid3_update_send_interval(hctx);
}
@@ -198,13 +188,13 @@ static inline void ccid3_hc_tx_update_s(
static inline void ccid3_hc_tx_update_win_count(struct ccid3_hc_tx_sock *hctx,
ktime_t now)
{
- u32 delta = ktime_us_delta(now, hctx->ccid3hctx_t_last_win_count),
- quarter_rtts = (4 * delta) / hctx->ccid3hctx_rtt;
+ u32 delta = ktime_us_delta(now, hctx->t_last_win_count),
+ quarter_rtts = (4 * delta) / hctx->rtt;
if (quarter_rtts > 0) {
- hctx->ccid3hctx_t_last_win_count = now;
- hctx->ccid3hctx_last_win_count += min(quarter_rtts, 5U);
- hctx->ccid3hctx_last_win_count &= 0xF; /* mod 16 */
+ hctx->t_last_win_count = now;
+ hctx->last_win_count += min(quarter_rtts, 5U);
+ hctx->last_win_count &= 0xF; /* mod 16 */
}
}
@@ -222,23 +212,21 @@ static void ccid3_hc_tx_no_feedback_time
}
ccid3_pr_debug("%s(%p, state=%s) - entry \n", dccp_role(sk), sk,
- ccid3_tx_state_name(hctx->ccid3hctx_state));
+ ccid3_tx_state_name(hctx->state));
- if (hctx->ccid3hctx_state == TFRC_SSTATE_FBACK)
+ if (hctx->state == TFRC_SSTATE_FBACK)
ccid3_hc_tx_set_state(sk, TFRC_SSTATE_NO_FBACK);
- else if (hctx->ccid3hctx_state != TFRC_SSTATE_NO_FBACK)
+ else if (hctx->state != TFRC_SSTATE_NO_FBACK)
goto out;
/*
* Determine new allowed sending rate X as per draft rfc3448bis-00, 4.4
+ * RTO is 0 if and only if no feedback has been received yet.
*/
- if (hctx->ccid3hctx_t_rto == 0 || /* no feedback received yet */
- hctx->ccid3hctx_p == 0) {
+ if (hctx->t_rto == 0 || hctx->p == 0) {
/* halve send rate directly */
- hctx->ccid3hctx_x = max(hctx->ccid3hctx_x / 2,
- (((__u64)hctx->ccid3hctx_s) << 6) /
- TFRC_T_MBI);
+ hctx->x = max(hctx->x / 2, (((u64)hctx->s) << 6) / TFRC_T_MBI);
ccid3_update_send_interval(hctx);
} else {
/*
@@ -251,33 +239,31 @@ static void ccid3_hc_tx_no_feedback_time
*
* Note that X_recv is scaled by 2^6 while X_calc is not
*/
- BUG_ON(hctx->ccid3hctx_p && !hctx->ccid3hctx_x_calc);
+ BUG_ON(hctx->p && !hctx->x_calc);
- if (hctx->ccid3hctx_x_calc > (hctx->ccid3hctx_x_recv >> 5))
- hctx->ccid3hctx_x_recv =
- max(hctx->ccid3hctx_x_recv / 2,
- (((__u64)hctx->ccid3hctx_s) << 6) /
- (2 * TFRC_T_MBI));
+ if (hctx->x_calc > (hctx->x_recv >> 5))
+ hctx->x_recv = max((((u64)hctx->s) << 6) / TFRC_T_MBI,
+ hctx->x_recv) / 2;
else {
- hctx->ccid3hctx_x_recv = hctx->ccid3hctx_x_calc;
- hctx->ccid3hctx_x_recv <<= 4;
+ hctx->x_recv = hctx->x_calc;
+ hctx->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->ccid3hctx_x);
+ (unsigned long long)hctx->x);
/*
* Set new timeout for the nofeedback timer.
* See comments in packet_recv() regarding the value of t_RTO.
*/
- if (unlikely(hctx->ccid3hctx_t_rto == 0)) /* no feedback yet */
+ if (unlikely(hctx->t_rto == 0)) /* no feedback received yet */
t_nfb = TFRC_INITIAL_TIMEOUT;
else
- t_nfb = max(hctx->ccid3hctx_t_rto, 2 * hctx->ccid3hctx_t_ipi);
+ t_nfb = max(hctx->t_rto, 2 * hctx->t_ipi);
restart_timer:
- sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer,
+ sk_reset_timer(sk, &hctx->no_feedback_timer,
jiffies + usecs_to_jiffies(t_nfb));
out:
bh_unlock_sock(sk);
@@ -305,18 +291,17 @@ static int ccid3_hc_tx_send_packet(struc
if (unlikely(skb->len == 0))
return -EBADMSG;
- switch (hctx->ccid3hctx_state) {
+ switch (hctx->state) {
case TFRC_SSTATE_NO_SENT:
- sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer,
- (jiffies +
+ sk_reset_timer(sk, &hctx->no_feedback_timer, (jiffies +
usecs_to_jiffies(TFRC_INITIAL_TIMEOUT)));
- hctx->ccid3hctx_last_win_count = 0;
- hctx->ccid3hctx_t_last_win_count = now;
+ hctx->last_win_count = 0;
+ hctx->t_last_win_count = now;
/* Set t_0 for initial packet */
- hctx->ccid3hctx_t_nom = now;
+ hctx->t_nom = now;
- hctx->ccid3hctx_s = skb->len;
+ hctx->s = skb->len;
/*
* Use initial RTT sample when available: recommended by erratum
@@ -325,13 +310,13 @@ static int ccid3_hc_tx_send_packet(struc
*/
if (dp->dccps_syn_rtt) {
ccid3_pr_debug("SYN RTT = %uus\n", dp->dccps_syn_rtt);
- hctx->ccid3hctx_rtt = dp->dccps_syn_rtt;
- hctx->ccid3hctx_x = rfc3390_initial_rate(sk);
- hctx->ccid3hctx_t_ld = now;
+ hctx->rtt = dp->dccps_syn_rtt;
+ hctx->x = rfc3390_initial_rate(sk);
+ hctx->t_ld = now;
} else {
/* Sender does not have RTT sample: X_pps = 1 pkt/sec */
- hctx->ccid3hctx_x = hctx->ccid3hctx_s;
- hctx->ccid3hctx_x <<= 6;
+ hctx->x = hctx->s;
+ hctx->x <<= 6;
}
ccid3_update_send_interval(hctx);
@@ -339,7 +324,7 @@ static int ccid3_hc_tx_send_packet(struc
break;
case TFRC_SSTATE_NO_FBACK:
case TFRC_SSTATE_FBACK:
- delay = ktime_us_delta(hctx->ccid3hctx_t_nom, now);
+ delay = ktime_us_delta(hctx->t_nom, now);
ccid3_pr_debug("delay=%ld\n", (long)delay);
if (delay > CCID_PACKET_DELAY_MAX_USEC)
delay = CCID_PACKET_DELAY_MAX_USEC;
@@ -351,7 +336,7 @@ static int ccid3_hc_tx_send_packet(struc
* else
* // send the packet in (t_nom - t_now) milliseconds.
*/
- if (delay - (s64)hctx->ccid3hctx_delta >= 1000)
+ if (delay - (s64)hctx->delta >= 1000)
return (u32)delay / 1000L;
ccid3_hc_tx_update_win_count(hctx, now);
@@ -363,11 +348,10 @@ static int ccid3_hc_tx_send_packet(struc
/* prepare to send now (add options etc.) */
dp->dccps_hc_tx_insert_options = 1;
- DCCP_SKB_CB(skb)->dccpd_ccval = hctx->ccid3hctx_last_win_count;
+ DCCP_SKB_CB(skb)->dccpd_ccval = hctx->last_win_count;
/* set the nominal send time for the next following packet */
- hctx->ccid3hctx_t_nom = ktime_add_us(hctx->ccid3hctx_t_nom,
- hctx->ccid3hctx_t_ipi);
+ hctx->t_nom = ktime_add_us(hctx->t_nom, hctx->t_ipi);
return CCID_PACKET_SEND_AT_ONCE;
}
@@ -377,7 +361,7 @@ static void ccid3_hc_tx_packet_sent(stru
ccid3_hc_tx_update_s(hctx, len);
- if (tfrc_tx_hist_add(&hctx->ccid3hctx_hist, dccp_sk(sk)->dccps_gss))
+ if (tfrc_tx_hist_add(&hctx->hist, dccp_sk(sk)->dccps_gss))
DCCP_CRIT("packet history - out of memory!");
}
@@ -391,21 +375,20 @@ static void ccid3_hc_tx_packet_recv(stru
u32 pinv, r_sample;
/* Ignore if nothing has been sent; feedback is on Ack/DataAck only */
- if (tfrc_tx_hist_is_empty(hctx->ccid3hctx_hist) ||
+ if (tfrc_tx_hist_is_empty(hctx->hist) ||
!(dcb->dccpd_type == DCCP_PKT_ACK ||
dcb->dccpd_type == DCCP_PKT_DATAACK))
return;
/* ... and only in the established state */
- if (hctx->ccid3hctx_state != TFRC_SSTATE_FBACK &&
- hctx->ccid3hctx_state != TFRC_SSTATE_NO_FBACK)
+ if (hctx->state != TFRC_SSTATE_FBACK &&
+ hctx->state != TFRC_SSTATE_NO_FBACK)
return;
- opt_recv = &hctx->ccid3hctx_options_received;
+ opt_recv = &hctx->options_received;
now = ktime_get_real();
/* Estimate RTT from history if ACK number is valid */
- r_sample = tfrc_tx_hist_rtt(hctx->ccid3hctx_hist,
- dcb->dccpd_ack_seq, now);
+ r_sample = tfrc_tx_hist_rtt(hctx->hist, dcb->dccpd_ack_seq, now);
if (r_sample == 0) {
DCCP_WARN("%s(%p): %s with bogus ACK #%llu\n",
dccp_role(sk), sk, dccp_packet_name(dcb->dccpd_type),
@@ -414,37 +397,37 @@ static void ccid3_hc_tx_packet_recv(stru
}
/* Update receive rate in units of 64 * bytes/second */
- hctx->ccid3hctx_x_recv = opt_recv->ccid3or_receive_rate;
- hctx->ccid3hctx_x_recv <<= 6;
+ hctx->x_recv = opt_recv->ccid3or_receive_rate;
+ hctx->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->ccid3hctx_p = 0;
+ hctx->p = 0;
else /* can not exceed 100% */
- hctx->ccid3hctx_p = scaled_div(1, pinv);
+ hctx->p = scaled_div(1, pinv);
/*
* Validate new RTT sample and update moving average
*/
r_sample = dccp_sample_rtt(sk, r_sample);
- hctx->ccid3hctx_rtt = tfrc_ewma(hctx->ccid3hctx_rtt, r_sample, 9);
+ hctx->rtt = tfrc_ewma(hctx->rtt, r_sample, 9);
/*
* Update allowed sending rate X as per draft rfc3448bis-00, 4.2/3
*/
- if (hctx->ccid3hctx_state == TFRC_SSTATE_NO_FBACK) {
+ if (hctx->state == TFRC_SSTATE_NO_FBACK) {
ccid3_hc_tx_set_state(sk, TFRC_SSTATE_FBACK);
- if (hctx->ccid3hctx_t_rto == 0) {
+ if (hctx->t_rto == 0) {
/*
* Initial feedback packet: Larger Initial Windows (4.2)
*/
- hctx->ccid3hctx_x = rfc3390_initial_rate(sk);
- hctx->ccid3hctx_t_ld = now;
+ hctx->x = rfc3390_initial_rate(sk);
+ hctx->t_ld = now;
ccid3_update_send_interval(hctx);
goto done_computing_x;
- } else if (hctx->ccid3hctx_p == 0) {
+ } else if (hctx->p == 0) {
/*
* First feedback after nofeedback timer expiry (4.3)
*/
@@ -453,25 +436,20 @@ static void ccid3_hc_tx_packet_recv(stru
}
/* Update sending rate (step 4 of [RFC 3448, 4.3]) */
- if (hctx->ccid3hctx_p > 0)
- hctx->ccid3hctx_x_calc =
- tfrc_calc_x(hctx->ccid3hctx_s,
- hctx->ccid3hctx_rtt,
- hctx->ccid3hctx_p);
+ if (hctx->p > 0)
+ hctx->x_calc = tfrc_calc_x(hctx->s, hctx->rtt, hctx->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->ccid3hctx_rtt, r_sample,
- hctx->ccid3hctx_s, hctx->ccid3hctx_p,
- hctx->ccid3hctx_x_calc,
- (unsigned)(hctx->ccid3hctx_x_recv >> 6),
- (unsigned)(hctx->ccid3hctx_x >> 6));
+ dccp_role(sk), sk, hctx->rtt, r_sample,
+ hctx->s, hctx->p, hctx->x_calc,
+ (unsigned)(hctx->x_recv >> 6),
+ (unsigned)(hctx->x >> 6));
/* unschedule no feedback timer */
- sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer);
+ sk_stop_timer(sk, &hctx->no_feedback_timer);
/*
* As we have calculated new ipi, delta, t_nom it is possible
@@ -485,21 +463,19 @@ done_computing_x:
* This can help avoid triggering the nofeedback timer too
* often ('spinning') on LANs with small RTTs.
*/
- hctx->ccid3hctx_t_rto = max_t(u32, 4 * hctx->ccid3hctx_rtt,
- (CONFIG_IP_DCCP_CCID3_RTO *
- (USEC_PER_SEC / 1000)));
+ hctx->t_rto = max_t(u32, 4 * hctx->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->ccid3hctx_t_rto, 2 * hctx->ccid3hctx_t_ipi);
+ t_nfb = max(hctx->t_rto, 2 * hctx->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);
+ dccp_role(sk), sk, usecs_to_jiffies(t_nfb), t_nfb);
- sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer,
+ sk_reset_timer(sk, &hctx->no_feedback_timer,
jiffies + usecs_to_jiffies(t_nfb));
}
@@ -513,7 +489,7 @@ static int ccid3_hc_tx_parse_options(str
struct ccid3_options_received *opt_recv;
__be32 opt_val;
- opt_recv = &hctx->ccid3hctx_options_received;
+ opt_recv = &hctx->options_received;
if (opt_recv->ccid3or_seqno != dp->dccps_gsr) {
opt_recv->ccid3or_seqno = dp->dccps_gsr;
@@ -569,9 +545,9 @@ static int ccid3_hc_tx_init(struct ccid
{
struct ccid3_hc_tx_sock *hctx = ccid_priv(ccid);
- hctx->ccid3hctx_state = TFRC_SSTATE_NO_SENT;
- hctx->ccid3hctx_hist = NULL;
- setup_timer(&hctx->ccid3hctx_no_feedback_timer,
+ hctx->state = TFRC_SSTATE_NO_SENT;
+ hctx->hist = NULL;
+ setup_timer(&hctx->no_feedback_timer,
ccid3_hc_tx_no_feedback_timer, (unsigned long)sk);
return 0;
@@ -582,29 +558,37 @@ static void ccid3_hc_tx_exit(struct sock
struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
ccid3_hc_tx_set_state(sk, TFRC_SSTATE_TERM);
- sk_stop_timer(sk, &hctx->ccid3hctx_no_feedback_timer);
+ sk_stop_timer(sk, &hctx->no_feedback_timer);
- tfrc_tx_hist_purge(&hctx->ccid3hctx_hist);
+ tfrc_tx_hist_purge(&hctx->hist);
}
static void ccid3_hc_tx_get_info(struct sock *sk, struct tcp_info *info)
{
- info->tcpi_rto = ccid3_hc_tx_sk(sk)->ccid3hctx_t_rto;
- info->tcpi_rtt = ccid3_hc_tx_sk(sk)->ccid3hctx_rtt;
+ info->tcpi_rto = ccid3_hc_tx_sk(sk)->t_rto;
+ info->tcpi_rtt = ccid3_hc_tx_sk(sk)->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 = ccid3_hc_tx_sk(sk);
+ struct tfrc_tx_info tfrc;
const void *val;
switch (optname) {
case DCCP_SOCKOPT_CCID_TX_INFO:
- if (len < sizeof(hctx->ccid3hctx_tfrc))
+ if (len < sizeof(tfrc))
return -EINVAL;
- len = sizeof(hctx->ccid3hctx_tfrc);
- val = &hctx->ccid3hctx_tfrc;
+ tfrc.tfrctx_x = hctx->x;
+ tfrc.tfrctx_x_recv = hctx->x_recv;
+ tfrc.tfrctx_x_calc = hctx->x_calc;
+ tfrc.tfrctx_rtt = hctx->rtt;
+ tfrc.tfrctx_p = hctx->p;
+ tfrc.tfrctx_rto = hctx->t_rto;
+ tfrc.tfrctx_ipi = hctx->t_ipi;
+ len = sizeof(tfrc);
+ val = &tfrc;
break;
default:
return -ENOPROTOOPT;
@@ -645,13 +629,13 @@ static void ccid3_hc_rx_set_state(struct
enum ccid3_hc_rx_states state)
{
struct ccid3_hc_rx_sock *hcrx = ccid3_hc_rx_sk(sk);
- enum ccid3_hc_rx_states oldstate = hcrx->ccid3hcrx_state;
+ enum ccid3_hc_rx_states oldstate = hcrx->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->ccid3hcrx_state = state;
+ hcrx->state = state;
}
static void ccid3_hc_rx_send_feedback(struct sock *sk,
@@ -663,15 +647,15 @@ static void ccid3_hc_rx_send_feedback(st
ktime_t now;
s64 delta = 0;
- if (unlikely(hcrx->ccid3hcrx_state == TFRC_RSTATE_TERM))
+ if (unlikely(hcrx->state == TFRC_RSTATE_TERM))
return;
now = ktime_get_real();
switch (fbtype) {
case CCID3_FBACK_INITIAL:
- hcrx->ccid3hcrx_x_recv = 0;
- hcrx->ccid3hcrx_pinv = ~0U; /* see RFC 4342, 8.5 */
+ hcrx->x_recv = 0;
+ hcrx->p_inverse = ~0U; /* see RFC 4342, 8.5 */
break;
case CCID3_FBACK_PARAM_CHANGE:
/*
@@ -684,27 +668,26 @@ static void ccid3_hc_rx_send_feedback(st
* the number of bytes since last feedback.
* This is a safe fallback, since X is bounded above by X_calc.
*/
- if (hcrx->ccid3hcrx_x_recv > 0)
+ if (hcrx->x_recv > 0)
break;
/* fall through */
case CCID3_FBACK_PERIODIC:
- delta = ktime_us_delta(now, hcrx->ccid3hcrx_tstamp_last_feedback);
+ delta = ktime_us_delta(now, hcrx->tstamp_last_feedback);
if (delta <= 0)
DCCP_BUG("delta (%ld) <= 0", (long)delta);
else
- hcrx->ccid3hcrx_x_recv =
- scaled_div32(hcrx->ccid3hcrx_bytes_recv, delta);
+ hcrx->x_recv = scaled_div32(hcrx->bytes_recv, delta);
break;
default:
return;
}
- ccid3_pr_debug("Interval %ldusec, X_recv=%u, 1/p=%u\n", (long)delta,
- hcrx->ccid3hcrx_x_recv, hcrx->ccid3hcrx_pinv);
+ ccid3_pr_debug("Interval %ldusec, X_recv=%u, 1/p=%u\n",
+ (long)delta, hcrx->x_recv, hcrx->p_inverse);
- hcrx->ccid3hcrx_tstamp_last_feedback = now;
- hcrx->ccid3hcrx_last_counter = dccp_hdr(skb)->dccph_ccval;
- hcrx->ccid3hcrx_bytes_recv = 0;
+ hcrx->tstamp_last_feedback = now;
+ hcrx->last_counter = dccp_hdr(skb)->dccph_ccval;
+ hcrx->bytes_recv = 0;
dp->dccps_hc_rx_insert_options = 1;
dccp_send_ack(sk);
@@ -721,8 +704,8 @@ static int ccid3_hc_rx_insert_options(st
if (dccp_packet_without_ack(skb))
return 0;
- x_recv = htonl(hcrx->ccid3hcrx_x_recv);
- pinv = htonl(hcrx->ccid3hcrx_pinv);
+ x_recv = htonl(hcrx->x_recv);
+ pinv = htonl(hcrx->p_inverse);
if (dccp_insert_option(sk, skb, TFRC_OPT_LOSS_EVENT_RATE,
&pinv, sizeof(pinv)) ||
@@ -748,22 +731,23 @@ static u32 ccid3_first_li(struct sock *s
u32 x_recv, p, delta;
u64 fval;
- if (hcrx->ccid3hcrx_rtt == 0) {
+ if (hcrx->rtt == 0) {
DCCP_WARN("No RTT estimate available, using fallback RTT\n");
- hcrx->ccid3hcrx_rtt = DCCP_FALLBACK_RTT;
+ hcrx->rtt = DCCP_FALLBACK_RTT;
}
- delta = ktime_to_us(net_timedelta(hcrx->ccid3hcrx_tstamp_last_feedback));
- x_recv = scaled_div32(hcrx->ccid3hcrx_bytes_recv, delta);
+ delta = ktime_to_us(net_timedelta(hcrx->tstamp_last_feedback));
+ x_recv = scaled_div32(hcrx->bytes_recv, delta);
if (x_recv == 0) { /* would also trigger divide-by-zero */
DCCP_WARN("X_recv==0\n");
- if ((x_recv = hcrx->ccid3hcrx_x_recv) == 0) {
+ if (hcrx->x_recv == 0) {
DCCP_BUG("stored value of X_recv is zero");
return ~0U;
}
+ x_recv = hcrx->x_recv;
}
- fval = scaled_div(hcrx->ccid3hcrx_s, hcrx->ccid3hcrx_rtt);
+ fval = scaled_div(hcrx->s, hcrx->rtt);
fval = scaled_div32(fval, x_recv);
p = tfrc_calc_x_reverse_lookup(fval);
@@ -780,14 +764,14 @@ static void ccid3_hc_rx_packet_recv(stru
const u64 ndp = dccp_sk(sk)->dccps_options_received.dccpor_ndp;
const bool is_data_packet = dccp_data_packet(skb);
- if (unlikely(hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA)) {
+ if (unlikely(hcrx->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->ccid3hcrx_s = payload;
+ hcrx->s = payload;
/*
- * Not necessary to update ccid3hcrx_bytes_recv here,
+ * Not necessary to update bytes_recv here,
* since X_recv = 0 for the first feedback packet (cf.
* RFC 3448, 6.3) -- gerrit
*/
@@ -795,7 +779,7 @@ static void ccid3_hc_rx_packet_recv(stru
goto update_records;
}
- if (tfrc_rx_hist_duplicate(&hcrx->ccid3hcrx_hist, skb))
+ if (tfrc_rx_hist_duplicate(&hcrx->hist, skb))
return; /* done receiving */
if (is_data_packet) {
@@ -803,22 +787,21 @@ static void ccid3_hc_rx_packet_recv(stru
/*
* Update moving-average of s and the sum of received payload bytes
*/
- hcrx->ccid3hcrx_s = tfrc_ewma(hcrx->ccid3hcrx_s, payload, 9);
- hcrx->ccid3hcrx_bytes_recv += payload;
+ hcrx->s = tfrc_ewma(hcrx->s, payload, 9);
+ hcrx->bytes_recv += payload;
}
/*
* Handle pending losses and otherwise check for new loss
*/
- if (tfrc_rx_hist_loss_pending(&hcrx->ccid3hcrx_hist) &&
- tfrc_rx_handle_loss(&hcrx->ccid3hcrx_hist,
- &hcrx->ccid3hcrx_li_hist,
- skb, ndp, ccid3_first_li, sk) ) {
+ if (tfrc_rx_hist_loss_pending(&hcrx->hist) &&
+ tfrc_rx_handle_loss(&hcrx->hist, &hcrx->li_hist,
+ skb, ndp, ccid3_first_li, sk)) {
do_feedback = CCID3_FBACK_PARAM_CHANGE;
goto done_receiving;
}
- if (tfrc_rx_hist_new_loss_indicated(&hcrx->ccid3hcrx_hist, skb, ndp))
+ if (tfrc_rx_hist_new_loss_indicated(&hcrx->hist, skb, ndp))
goto update_records;
/*
@@ -827,17 +810,17 @@ static void ccid3_hc_rx_packet_recv(stru
if (unlikely(!is_data_packet))
goto update_records;
- if (!tfrc_lh_is_initialised(&hcrx->ccid3hcrx_li_hist)) {
- const u32 sample = tfrc_rx_hist_sample_rtt(&hcrx->ccid3hcrx_hist, skb);
+ if (!tfrc_lh_is_initialised(&hcrx->li_hist)) {
+ const u32 sample = tfrc_rx_hist_sample_rtt(&hcrx->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->ccid3hcrx_rtt = tfrc_ewma(hcrx->ccid3hcrx_rtt, sample, 9);
+ hcrx->rtt = tfrc_ewma(hcrx->rtt, sample, 9);
- } else if (tfrc_lh_update_i_mean(&hcrx->ccid3hcrx_li_hist, skb)) {
+ } else if (tfrc_lh_update_i_mean(&hcrx->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.
@@ -848,11 +831,11 @@ static void ccid3_hc_rx_packet_recv(stru
/*
* Check if the periodic once-per-RTT feedback is due; RFC 4342, 10.3
*/
- if (SUB16(dccp_hdr(skb)->dccph_ccval, hcrx->ccid3hcrx_last_counter) > 3)
+ if (SUB16(dccp_hdr(skb)->dccph_ccval, hcrx->last_counter) > 3)
do_feedback = CCID3_FBACK_PERIODIC;
update_records:
- tfrc_rx_hist_add_packet(&hcrx->ccid3hcrx_hist, skb, ndp);
+ tfrc_rx_hist_add_packet(&hcrx->hist, skb, ndp);
done_receiving:
if (do_feedback)
@@ -863,9 +846,9 @@ static int ccid3_hc_rx_init(struct ccid
{
struct ccid3_hc_rx_sock *hcrx = ccid_priv(ccid);
- hcrx->ccid3hcrx_state = TFRC_RSTATE_NO_DATA;
- tfrc_lh_init(&hcrx->ccid3hcrx_li_hist);
- return tfrc_rx_hist_alloc(&hcrx->ccid3hcrx_hist);
+ hcrx->state = TFRC_RSTATE_NO_DATA;
+ tfrc_lh_init(&hcrx->li_hist);
+ return tfrc_rx_hist_alloc(&hcrx->hist);
}
static void ccid3_hc_rx_exit(struct sock *sk)
@@ -874,15 +857,15 @@ static void ccid3_hc_rx_exit(struct sock
ccid3_hc_rx_set_state(sk, TFRC_RSTATE_TERM);
- tfrc_rx_hist_purge(&hcrx->ccid3hcrx_hist);
- tfrc_lh_cleanup(&hcrx->ccid3hcrx_li_hist);
+ tfrc_rx_hist_purge(&hcrx->hist);
+ tfrc_lh_cleanup(&hcrx->li_hist);
}
static void ccid3_hc_rx_get_info(struct sock *sk, struct tcp_info *info)
{
- info->tcpi_ca_state = ccid3_hc_rx_sk(sk)->ccid3hcrx_state;
+ info->tcpi_ca_state = ccid3_hc_rx_sk(sk)->state;
info->tcpi_options |= TCPI_OPT_TIMESTAMPS;
- info->tcpi_rcv_rtt = ccid3_hc_rx_sk(sk)->ccid3hcrx_rtt;
+ info->tcpi_rcv_rtt = ccid3_hc_rx_sk(sk)->rtt;
}
static int ccid3_hc_rx_getsockopt(struct sock *sk, const int optname, int len,
@@ -896,10 +879,10 @@ static int ccid3_hc_rx_getsockopt(struct
case DCCP_SOCKOPT_CCID_RX_INFO:
if (len < sizeof(rx_info))
return -EINVAL;
- rx_info.tfrcrx_x_recv = hcrx->ccid3hcrx_x_recv;
- rx_info.tfrcrx_rtt = hcrx->ccid3hcrx_rtt;
- rx_info.tfrcrx_p = hcrx->ccid3hcrx_pinv == 0 ? ~0U :
- scaled_div(1, hcrx->ccid3hcrx_pinv);
+ rx_info.tfrcrx_x_recv = hcrx->x_recv;
+ rx_info.tfrcrx_rtt = hcrx->rtt;
+ rx_info.tfrcrx_p = hcrx->p_inverse == 0 ? ~0U :
+ scaled_div(1, hcrx->p_inverse);
len = sizeof(rx_info);
val = &rx_info;
break;
--- a/net/dccp/probe.c
+++ b/net/dccp/probe.c
@@ -71,11 +71,9 @@ static void jdccp_write_xmit(struct sock
if (hctx)
len += sprintf(tbuf + len, " %d %d %d %u %u %u %d",
- hctx->ccid3hctx_s, hctx->ccid3hctx_rtt,
- hctx->ccid3hctx_p, hctx->ccid3hctx_x_calc,
- (unsigned)(hctx->ccid3hctx_x_recv >> 6),
- (unsigned)(hctx->ccid3hctx_x >> 6),
- hctx->ccid3hctx_t_ipi);
+ hctx->s, hctx->rtt, hctx->p, hctx->x_calc,
+ (unsigned)(hctx->x_recv >> 6),
+ (unsigned)(hctx->x >> 6), hctx->t_ipi);
len += sprintf(tbuf + len, "\n");
kfifo_put(dccpw.fifo, tbuf, len);
--
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