Sorry if this comes late. By checking on values, I noted that values were
not shifted properly since the typecast from u32 to __u64 was not performed
properly. Fixed by explicitly casting each type.
(uploaded as number 17_CCID3_fix-scaling-type-cast.diff)
----------------------------> Patch <--------------------------------------------
[CCID3]: BUG-FIX - conversion errors
This fixes conversion errors which arose by not properly type-casting
from u32 to __u64. Fixed by explicitly casting each type which is not
__u64, or by performing operation after assignment.
The patch further adds missing debug information to track the current
value of X_recv.
Signed-off-by: Gerrit Renker <gerrit@xxxxxxxxxxxxxx>
---
net/dccp/ccids/ccid3.c | 52 +++++++++++++++++++++++++++----------------------
1 file changed, 29 insertions(+), 23 deletions(-)
--- a/net/dccp/ccids/ccid3.c
+++ b/net/dccp/ccids/ccid3.c
@@ -123,18 +123,19 @@ static void ccid3_hc_tx_update_x(struct
if (hctx->ccid3hctx_p > 0) {
- hctx->ccid3hctx_x = min_t(u64, hctx->ccid3hctx_x_calc << 6,
- hctx->ccid3hctx_x_recv * 2 );
- hctx->ccid3hctx_x = max_t(u64, hctx->ccid3hctx_x,
- (hctx->ccid3hctx_s << 6)/TFRC_T_MBI);
+ hctx->ccid3hctx_x = min(((__u64)hctx->ccid3hctx_x_calc) << 6,
+ hctx->ccid3hctx_x_recv * 2 );
+ hctx->ccid3hctx_x = max(hctx->ccid3hctx_x,
+ (((__u64)hctx->ccid3hctx_s) << 6) /
+ TFRC_T_MBI);
} else if (timeval_delta(now, &hctx->ccid3hctx_t_ld) -
(suseconds_t)hctx->ccid3hctx_rtt >= 0 ) {
- hctx->ccid3hctx_x = max(2 * min(hctx->ccid3hctx_x,
- hctx->ccid3hctx_x_recv),
- scaled_div(hctx->ccid3hctx_s << 6,
- hctx->ccid3hctx_rtt ));
+ hctx->ccid3hctx_x =
+ max(2 * min(hctx->ccid3hctx_x, hctx->ccid3hctx_x_recv),
+ scaled_div(((__u64)hctx->ccid3hctx_s) << 6,
+ hctx->ccid3hctx_rtt ) );
hctx->ccid3hctx_t_ld = *now;
}
@@ -207,8 +208,9 @@ static void ccid3_hc_tx_no_feedback_time
switch (hctx->ccid3hctx_state) {
case TFRC_SSTATE_NO_FBACK:
/* RFC 3448, 4.4: Halve send rate directly */
- hctx->ccid3hctx_x = max_t(u32, hctx->ccid3hctx_x / 2,
- (hctx->ccid3hctx_s << 6)/TFRC_T_MBI);
+ hctx->ccid3hctx_x = max(hctx->ccid3hctx_x / 2,
+ (((__u64)hctx->ccid3hctx_s) << 6) /
+ TFRC_T_MBI);
ccid3_pr_debug("%s(%p, state=%s), updated tx rate to %u "
"bytes/s\n", dccp_role(sk), sk,
@@ -226,7 +228,7 @@ static void ccid3_hc_tx_no_feedback_time
*/
if (!hctx->ccid3hctx_idle ||
(hctx->ccid3hctx_x_recv >= 4 *
- scaled_div(hctx->ccid3hctx_s << 6, hctx->ccid3hctx_rtt))) {
+ scaled_div(((__u64)hctx->ccid3hctx_s) << 6, hctx->ccid3hctx_rtt))) {
struct timeval now;
ccid3_pr_debug("%s(%p, state=%s), not idle\n",
@@ -249,15 +251,16 @@ static void ccid3_hc_tx_no_feedback_time
hctx->ccid3hctx_x_calc > (hctx->ccid3hctx_x_recv >> 5)) {
hctx->ccid3hctx_x_recv =
- max_t(u64, hctx->ccid3hctx_x_recv / 2,
- (hctx->ccid3hctx_s << 6) /
+ 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 << 4;
-
+ } 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);
}
@@ -320,7 +323,8 @@ static int ccid3_hc_tx_send_packet(struc
/* 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 << 6;
+ 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;
@@ -421,7 +425,8 @@ 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 << 6;
+ hctx->ccid3hctx_x_recv = opt_recv->ccid3or_receive_rate;
+ hctx->ccid3hctx_x_recv <<= 6;
/* Update loss event rate */
pinv = opt_recv->ccid3or_loss_event_rate;
@@ -460,10 +465,10 @@ static void ccid3_hc_tx_packet_recv(stru
* Larger Initial Windows [RFC 4342, sec. 5]
* We deviate in that we use `s' instead of `MSS'.
*/
- u16 w_init = min( 4 * hctx->ccid3hctx_s,
- max(2 * hctx->ccid3hctx_s, 4380));
+ __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 = scaled_div(w_init << 6, r_sample);
hctx->ccid3hctx_t_ld = now;
ccid3_update_send_time(hctx);
@@ -487,11 +492,12 @@ static void ccid3_hc_tx_packet_recv(stru
ccid3_hc_tx_update_x(sk, &now);
ccid3_pr_debug("%s(%p), RTT=%uus (sample=%ldus), s=%u, "
- "p=%u, X_calc=%u, X=%u\n", dccp_role(sk),
+ "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 >> 6));
+ (unsigned)(hctx->ccid3hctx_x_recv >> 6),
+ (unsigned)(hctx->ccid3hctx_x >> 6) );
}
/* unschedule no feedback timer */
-
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