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-rw-r--r--net/dccp/ccids/ccid3.c322
-rw-r--r--net/dccp/ccids/ccid3.h10
-rw-r--r--net/dccp/ccids/lib/loss_interval.c2
3 files changed, 161 insertions, 173 deletions
diff --git a/net/dccp/ccids/ccid3.c b/net/dccp/ccids/ccid3.c
index 746f79d104b..d7d9ce73724 100644
--- a/net/dccp/ccids/ccid3.c
+++ b/net/dccp/ccids/ccid3.c
@@ -33,7 +33,6 @@
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
-
#include "../ccid.h"
#include "../dccp.h"
#include "lib/packet_history.h"
@@ -52,6 +51,9 @@ static struct dccp_tx_hist *ccid3_tx_hist;
static struct dccp_rx_hist *ccid3_rx_hist;
static struct dccp_li_hist *ccid3_li_hist;
+/*
+ * Transmitter Half-Connection Routines
+ */
#ifdef CONFIG_IP_DCCP_CCID3_DEBUG
static const char *ccid3_tx_state_name(enum ccid3_hc_tx_states state)
{
@@ -80,23 +82,37 @@ static void ccid3_hc_tx_set_state(struct sock *sk,
}
/*
- * Recalculate scheduled nominal send time t_nom, inter-packet interval
- * t_ipi, and delta value. Should be called after each change to X.
+ * Compute the initial sending rate X_init according to RFC 3390:
+ * w_init = min(4 * MSS, max(2 * MSS, 4380 bytes))
+ * X_init = w_init / RTT
+ * For consistency with other parts of the code, X_init is scaled by 2^6.
*/
-static inline void ccid3_update_send_time(struct ccid3_hc_tx_sock *hctx)
+static inline u64 rfc3390_initial_rate(struct sock *sk)
{
- timeval_sub_usecs(&hctx->ccid3hctx_t_nom, hctx->ccid3hctx_t_ipi);
+ const struct dccp_sock *dp = dccp_sk(sk);
+ const __u32 w_init = min(4 * dp->dccps_mss_cache,
+ max(2 * dp->dccps_mss_cache, 4380U));
- /* Calculate new t_ipi = s / X_inst (X_inst is in 64 * bytes/second) */
- hctx->ccid3hctx_t_ipi = scaled_div(hctx->ccid3hctx_s,
- hctx->ccid3hctx_x >> 6);
+ return scaled_div(w_init << 6, ccid3_hc_tx_sk(sk)->ccid3hctx_rtt);
+}
- /* Update nominal send time with regard to the new t_ipi */
- timeval_add_usecs(&hctx->ccid3hctx_t_nom, hctx->ccid3hctx_t_ipi);
+/*
+ * Recalculate t_ipi and delta (should be called whenever X changes)
+ */
+static inline 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);
/* 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);
+
+ 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));
+
}
/*
* Update X by
@@ -112,19 +128,28 @@ static inline void ccid3_update_send_time(struct ccid3_hc_tx_sock *hctx)
* fine-grained resolution of sending rates. This requires scaling by 2^6
* throughout the code. Only X_calc is unscaled (in bytes/second).
*
- * If X has changed, we also update the scheduled send time t_now,
- * the inter-packet interval t_ipi, and the delta value.
*/
static void ccid3_hc_tx_update_x(struct sock *sk, struct timeval *now)
{
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;
+ /*
+ * Handle IDLE periods: do not reduce below RFC3390 initial sending rate
+ * when idling [RFC 4342, 5.1]. See also draft-ietf-dccp-rfc3448bis.
+ * For consistency with X and X_recv, min_rate is also scaled by 2^6.
+ */
+ if (unlikely(hctx->ccid3hctx_idle)) {
+ min_rate = rfc3390_initial_rate(sk);
+ min_rate = max(min_rate, 2 * hctx->ccid3hctx_x_recv);
+ }
+
if (hctx->ccid3hctx_p > 0) {
hctx->ccid3hctx_x = min(((__u64)hctx->ccid3hctx_x_calc) << 6,
- hctx->ccid3hctx_x_recv * 2);
+ min_rate);
hctx->ccid3hctx_x = max(hctx->ccid3hctx_x,
(((__u64)hctx->ccid3hctx_s) << 6) /
TFRC_T_MBI);
@@ -133,14 +158,21 @@ static void ccid3_hc_tx_update_x(struct sock *sk, struct timeval *now)
(suseconds_t)hctx->ccid3hctx_rtt >= 0) {
hctx->ccid3hctx_x =
- max(2 * min(hctx->ccid3hctx_x, hctx->ccid3hctx_x_recv),
+ max(min(2 * hctx->ccid3hctx_x, min_rate),
scaled_div(((__u64)hctx->ccid3hctx_s) << 6,
hctx->ccid3hctx_rtt));
hctx->ccid3hctx_t_ld = *now;
}
- if (hctx->ccid3hctx_x != old_x)
- ccid3_update_send_time(hctx);
+ if (hctx->ccid3hctx_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));
+
+ ccid3_update_send_interval(hctx);
+ }
}
/*
@@ -149,17 +181,12 @@ static void ccid3_hc_tx_update_x(struct sock *sk, struct timeval *now)
*/
static inline void ccid3_hc_tx_update_s(struct ccid3_hc_tx_sock *hctx, int len)
{
- if (unlikely(len == 0))
- ccid3_pr_debug("Packet payload length is 0 - not updating\n");
- else
- hctx->ccid3hctx_s = hctx->ccid3hctx_s == 0 ? len :
- (9 * hctx->ccid3hctx_s + len) / 10;
- /*
- * Note: We could do a potential optimisation here - when `s' changes,
- * recalculate sending rate and consequently t_ipi, t_delta, and
- * t_now. This is however non-standard, and the benefits are not
- * clear, so it is currently left out.
- */
+ const u16 old_s = hctx->ccid3hctx_s;
+
+ hctx->ccid3hctx_s = old_s == 0 ? len : (9 * old_s + len) / 10;
+
+ if (hctx->ccid3hctx_s != old_s)
+ ccid3_update_send_interval(hctx);
}
/*
@@ -193,6 +220,7 @@ static void ccid3_hc_tx_no_feedback_timer(unsigned long data)
{
struct sock *sk = (struct sock *)data;
struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
+ struct timeval now;
unsigned long t_nfb = USEC_PER_SEC / 5;
bh_lock_sock(sk);
@@ -205,6 +233,8 @@ static void ccid3_hc_tx_no_feedback_timer(unsigned long data)
ccid3_pr_debug("%s(%p, state=%s) - entry \n", dccp_role(sk), sk,
ccid3_tx_state_name(hctx->ccid3hctx_state));
+ hctx->ccid3hctx_idle = 1;
+
switch (hctx->ccid3hctx_state) {
case TFRC_SSTATE_NO_FBACK:
/* RFC 3448, 4.4: Halve send rate directly */
@@ -219,53 +249,37 @@ static void ccid3_hc_tx_no_feedback_timer(unsigned long data)
/* The value of R is still undefined and so we can not recompute
* the timout value. Keep initial value as per [RFC 4342, 5]. */
t_nfb = TFRC_INITIAL_TIMEOUT;
- ccid3_update_send_time(hctx);
+ ccid3_update_send_interval(hctx);
break;
case TFRC_SSTATE_FBACK:
/*
- * Check if IDLE since last timeout and recv rate is less than
- * 4 packets (in units of 64*bytes/sec) per RTT
+ * Modify the cached value of X_recv [RFC 3448, 4.4]
+ *
+ * If (p == 0 || X_calc > 2 * X_recv)
+ * X_recv = max(X_recv / 2, s / (2 * t_mbi));
+ * Else
+ * X_recv = X_calc / 4;
+ *
+ * Note that X_recv is scaled by 2^6 while X_calc is not
*/
- if (!hctx->ccid3hctx_idle ||
- (hctx->ccid3hctx_x_recv >= 4 *
- scaled_div(((__u64)hctx->ccid3hctx_s) << 6,
- hctx->ccid3hctx_rtt))) {
- struct timeval now;
+ BUG_ON(hctx->ccid3hctx_p && !hctx->ccid3hctx_x_calc);
- ccid3_pr_debug("%s(%p, state=%s), not idle\n",
- dccp_role(sk), sk,
- ccid3_tx_state_name(hctx->ccid3hctx_state));
+ if (hctx->ccid3hctx_p == 0 ||
+ (hctx->ccid3hctx_x_calc > (hctx->ccid3hctx_x_recv >> 5))) {
- /*
- * Modify the cached value of X_recv [RFC 3448, 4.4]
- *
- * If (p == 0 || X_calc > 2 * X_recv)
- * X_recv = max(X_recv / 2, s / (2 * t_mbi));
- * Else
- * X_recv = X_calc / 4;
- *
- * Note that X_recv is scaled by 2^6 while X_calc is not
- */
- BUG_ON(hctx->ccid3hctx_p && !hctx->ccid3hctx_x_calc);
-
- if (hctx->ccid3hctx_p == 0 ||
- (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->ccid3hctx_p == 0)
- dccp_timestamp(sk, &now);
- } else {
- hctx->ccid3hctx_x_recv = hctx->ccid3hctx_x_calc;
- hctx->ccid3hctx_x_recv <<= 4;
- }
- /* Now recalculate X [RFC 3448, 4.3, step (4)] */
- ccid3_hc_tx_update_x(sk, &now);
+ hctx->ccid3hctx_x_recv =
+ max(hctx->ccid3hctx_x_recv / 2,
+ (((__u64)hctx->ccid3hctx_s) << 6) /
+ (2 * TFRC_T_MBI));
+
+ if (hctx->ccid3hctx_p == 0)
+ dccp_timestamp(sk, &now);
+ } else {
+ hctx->ccid3hctx_x_recv = hctx->ccid3hctx_x_calc;
+ hctx->ccid3hctx_x_recv <<= 4;
}
+ /* Now recalculate X [RFC 3448, 4.3, step (4)] */
+ ccid3_hc_tx_update_x(sk, &now);
/*
* Schedule no feedback timer to expire in
* max(t_RTO, 2 * s/X) = max(t_RTO, 2 * t_ipi)
@@ -280,8 +294,6 @@ static void ccid3_hc_tx_no_feedback_timer(unsigned long data)
goto out;
}
- hctx->ccid3hctx_idle = 1;
-
restart_timer:
sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer,
jiffies + usecs_to_jiffies(t_nfb));
@@ -322,24 +334,35 @@ static int ccid3_hc_tx_send_packet(struct sock *sk, struct sk_buff *skb)
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 initial sending rate X/s to 1pps (X is scaled by 2^6) */
- ccid3_hc_tx_update_s(hctx, skb->len);
- hctx->ccid3hctx_x = hctx->ccid3hctx_s;
- hctx->ccid3hctx_x <<= 6;
-
- /* First timeout, according to [RFC 3448, 4.2], is 1 second */
- hctx->ccid3hctx_t_ipi = USEC_PER_SEC;
- /* Initial delta: minimum of 0.5 sec and t_gran/2 */
- hctx->ccid3hctx_delta = TFRC_OPSYS_HALF_TIME_GRAN;
/* Set t_0 for initial packet */
hctx->ccid3hctx_t_nom = now;
+
+ hctx->ccid3hctx_s = skb->len;
+
+ /*
+ * Use initial RTT sample when available: recommended by erratum
+ * to RFC 4342. This implements the initialisation procedure of
+ * draft rfc3448bis, section 4.2. Remember, X is scaled by 2^6.
+ */
+ 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;
+ } else {
+ /* Sender does not have RTT sample: X = MSS/second */
+ hctx->ccid3hctx_x = dp->dccps_mss_cache;
+ hctx->ccid3hctx_x <<= 6;
+ }
+ ccid3_update_send_interval(hctx);
+
+ ccid3_hc_tx_set_state(sk, TFRC_SSTATE_NO_FBACK);
break;
case TFRC_SSTATE_NO_FBACK:
case TFRC_SSTATE_FBACK:
delay = timeval_delta(&hctx->ccid3hctx_t_nom, &now);
+ ccid3_pr_debug("delay=%ld\n", (long)delay);
/*
* Scheduling of packet transmissions [RFC 3448, 4.6]
*
@@ -361,6 +384,7 @@ static int ccid3_hc_tx_send_packet(struct sock *sk, struct sk_buff *skb)
/* 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;
+ hctx->ccid3hctx_idle = 0;
/* set the nominal send time for the next following packet */
timeval_add_usecs(&hctx->ccid3hctx_t_nom, hctx->ccid3hctx_t_ipi);
@@ -391,7 +415,6 @@ static void ccid3_hc_tx_packet_sent(struct sock *sk, int more,
packet->dccphtx_seqno = dccp_sk(sk)->dccps_gss;
packet->dccphtx_rtt = hctx->ccid3hctx_rtt;
packet->dccphtx_sent = 1;
- hctx->ccid3hctx_idle = 0;
}
static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb)
@@ -402,8 +425,7 @@ static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb)
struct dccp_tx_hist_entry *packet;
struct timeval now;
unsigned long t_nfb;
- u32 pinv;
- suseconds_t r_sample, t_elapsed;
+ u32 pinv, r_sample;
BUG_ON(hctx == NULL);
@@ -445,18 +467,10 @@ static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb)
* Calculate new round trip sample as per [RFC 3448, 4.3] by
* R_sample = (now - t_recvdata) - t_elapsed
*/
- r_sample = timeval_delta(&now, &packet->dccphtx_tstamp);
- t_elapsed = dp->dccps_options_received.dccpor_elapsed_time * 10;
-
- DCCP_BUG_ON(r_sample < 0);
- if (unlikely(r_sample <= t_elapsed))
- DCCP_WARN("WARNING: r_sample=%dus <= t_elapsed=%dus\n",
- (int)r_sample, (int)t_elapsed);
- else
- r_sample -= t_elapsed;
- CCID3_RTT_SANITY_CHECK(r_sample);
+ r_sample = dccp_sample_rtt(sk, &now, &packet->dccphtx_tstamp);
- /* Update RTT estimate by
+ /*
+ * Update RTT estimate by
* If (No feedback recv)
* R = R_sample;
* Else
@@ -467,27 +481,23 @@ static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb)
if (hctx->ccid3hctx_state == TFRC_SSTATE_NO_FBACK) {
/*
* Larger Initial Windows [RFC 4342, sec. 5]
- * We deviate in that we use `s' instead of `MSS'.
*/
- __u64 w_init = min(4 * hctx->ccid3hctx_s,
- max(2 * hctx->ccid3hctx_s, 4380));
hctx->ccid3hctx_rtt = r_sample;
- hctx->ccid3hctx_x = scaled_div(w_init << 6, r_sample);
+ hctx->ccid3hctx_x = rfc3390_initial_rate(sk);
hctx->ccid3hctx_t_ld = now;
- ccid3_update_send_time(hctx);
+ ccid3_update_send_interval(hctx);
- ccid3_pr_debug("%s(%p), s=%u, w_init=%llu, "
- "R_sample=%dus, X=%u\n", dccp_role(sk),
+ ccid3_pr_debug("%s(%p), s=%u, MSS=%u, "
+ "R_sample=%uus, X=%u\n", dccp_role(sk),
sk, hctx->ccid3hctx_s,
- (unsigned long long)w_init,
- (int)r_sample,
+ dp->dccps_mss_cache, r_sample,
(unsigned)(hctx->ccid3hctx_x >> 6));
ccid3_hc_tx_set_state(sk, TFRC_SSTATE_FBACK);
} else {
hctx->ccid3hctx_rtt = (9 * hctx->ccid3hctx_rtt +
- (u32)r_sample) / 10;
+ r_sample) / 10;
/* Update sending rate (step 4 of [RFC 3448, 4.3]) */
if (hctx->ccid3hctx_p > 0)
@@ -497,10 +507,10 @@ static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb)
hctx->ccid3hctx_p);
ccid3_hc_tx_update_x(sk, &now);
- ccid3_pr_debug("%s(%p), RTT=%uus (sample=%dus), s=%u, "
+ 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, (int)r_sample,
+ sk, hctx->ccid3hctx_rtt, r_sample,
hctx->ccid3hctx_s, hctx->ccid3hctx_p,
hctx->ccid3hctx_x_calc,
(unsigned)(hctx->ccid3hctx_x_recv >> 6),
@@ -644,10 +654,50 @@ static void ccid3_hc_tx_exit(struct sock *sk)
dccp_tx_hist_purge(ccid3_tx_hist, &hctx->ccid3hctx_hist);
}
+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);
+
+ /* Listen socks doesn't have a private CCID block */
+ if (sk->sk_state == DCCP_LISTEN)
+ return;
+
+ BUG_ON(hctx == NULL);
+
+ info->tcpi_rto = hctx->ccid3hctx_t_rto;
+ info->tcpi_rtt = hctx->ccid3hctx_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);
+ const void *val;
+
+ /* Listen socks doesn't have a private CCID block */
+ if (sk->sk_state == DCCP_LISTEN)
+ return -EINVAL;
+
+ switch (optname) {
+ case DCCP_SOCKOPT_CCID_TX_INFO:
+ if (len < sizeof(hctx->ccid3hctx_tfrc))
+ return -EINVAL;
+ len = sizeof(hctx->ccid3hctx_tfrc);
+ val = &hctx->ccid3hctx_tfrc;
+ break;
+ default:
+ return -ENOPROTOOPT;
+ }
+
+ if (put_user(len, optlen) || copy_to_user(optval, val, len))
+ return -EFAULT;
+
+ return 0;
+}
+
/*
- * RX Half Connection methods
+ * Receiver Half-Connection Routines
*/
-
#ifdef CONFIG_IP_DCCP_CCID3_DEBUG
static const char *ccid3_rx_state_name(enum ccid3_hc_rx_states state)
{
@@ -977,8 +1027,7 @@ static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb)
const struct dccp_options_received *opt_recv;
struct dccp_rx_hist_entry *packet;
struct timeval now;
- u32 p_prev, rtt_prev;
- suseconds_t r_sample, t_elapsed;
+ u32 p_prev, r_sample, rtt_prev;
int loss, payload_size;
BUG_ON(hcrx == NULL);
@@ -994,17 +1043,7 @@ static void ccid3_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb)
break;
rtt_prev = hcrx->ccid3hcrx_rtt;
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;
-
- DCCP_BUG_ON(r_sample < 0);
- if (unlikely(r_sample <= t_elapsed))
- DCCP_WARN("r_sample=%ldus, t_elapsed=%ldus\n",
- (long)r_sample, (long)t_elapsed);
- else
- r_sample -= t_elapsed;
- CCID3_RTT_SANITY_CHECK(r_sample);
+ r_sample = dccp_sample_rtt(sk, &now, NULL);
if (hcrx->ccid3hcrx_state == TFRC_RSTATE_NO_DATA)
hcrx->ccid3hcrx_rtt = r_sample;
@@ -1132,20 +1171,6 @@ static void ccid3_hc_rx_get_info(struct sock *sk, struct tcp_info *info)
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);
-
- /* Listen socks doesn't have a private CCID block */
- if (sk->sk_state == DCCP_LISTEN)
- return;
-
- BUG_ON(hctx == NULL);
-
- info->tcpi_rto = hctx->ccid3hctx_t_rto;
- info->tcpi_rtt = hctx->ccid3hctx_rtt;
-}
-
static int ccid3_hc_rx_getsockopt(struct sock *sk, const int optname, int len,
u32 __user *optval, int __user *optlen)
{
@@ -1173,33 +1198,6 @@ static int ccid3_hc_rx_getsockopt(struct sock *sk, const int optname, int len,
return 0;
}
-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);
- const void *val;
-
- /* Listen socks doesn't have a private CCID block */
- if (sk->sk_state == DCCP_LISTEN)
- return -EINVAL;
-
- switch (optname) {
- case DCCP_SOCKOPT_CCID_TX_INFO:
- if (len < sizeof(hctx->ccid3hctx_tfrc))
- return -EINVAL;
- len = sizeof(hctx->ccid3hctx_tfrc);
- val = &hctx->ccid3hctx_tfrc;
- break;
- default:
- return -ENOPROTOOPT;
- }
-
- if (put_user(len, optlen) || copy_to_user(optval, val, len))
- return -EFAULT;
-
- return 0;
-}
-
static struct ccid_operations ccid3 = {
.ccid_id = DCCPC_CCID3,
.ccid_name = "ccid3",
diff --git a/net/dccp/ccids/ccid3.h b/net/dccp/ccids/ccid3.h
index 15776a88c09..8d31b389c19 100644
--- a/net/dccp/ccids/ccid3.h
+++ b/net/dccp/ccids/ccid3.h
@@ -51,16 +51,6 @@
/* Parameter t_mbi from [RFC 3448, 4.3]: backoff interval in seconds */
#define TFRC_T_MBI 64
-/* What we think is a reasonable upper limit on RTT values */
-#define CCID3_SANE_RTT_MAX ((suseconds_t)(4 * USEC_PER_SEC))
-
-#define CCID3_RTT_SANITY_CHECK(rtt) do { \
- if (rtt > CCID3_SANE_RTT_MAX) { \
- DCCP_CRIT("RTT (%d) too large, substituting %d", \
- (int)rtt, (int)CCID3_SANE_RTT_MAX); \
- rtt = CCID3_SANE_RTT_MAX; \
- } } while (0)
-
enum ccid3_options {
TFRC_OPT_LOSS_EVENT_RATE = 192,
TFRC_OPT_LOSS_INTERVALS = 193,
diff --git a/net/dccp/ccids/lib/loss_interval.c b/net/dccp/ccids/lib/loss_interval.c
index 0a0baef16b3..372d7e75cdd 100644
--- a/net/dccp/ccids/lib/loss_interval.c
+++ b/net/dccp/ccids/lib/loss_interval.c
@@ -91,7 +91,7 @@ u32 dccp_li_hist_calc_i_mean(struct list_head *list)
u32 w_tot = 0;
list_for_each_entry_safe(li_entry, li_next, list, dccplih_node) {
- if (li_entry->dccplih_interval != ~0) {
+ if (li_entry->dccplih_interval != ~0U) {
i_tot0 += li_entry->dccplih_interval * dccp_li_hist_w[i];
w_tot += dccp_li_hist_w[i];
if (i != 0)
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-22 09:17:17 +0000