[DCCP] Introduce dccp_timestamp
To start the timestamps with 0.0ms, easing the integer maths in the CCIDs, this
probably will be reworked to use the to be introduced struct timeval_offset
infrastructure out of skb_get_timestamp, etc.
Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
diff --git a/include/linux/dccp.h b/include/linux/dccp.h
index 5e0af0d..8bf4bac 100644
--- a/include/linux/dccp.h
+++ b/include/linux/dccp.h
@@ -432,6 +432,7 @@
struct ccid *dccps_hc_rx_ccid;
struct ccid *dccps_hc_tx_ccid;
struct dccp_options_received dccps_options_received;
+ struct timeval dccps_epoch;
enum dccp_role dccps_role:2;
__u8 dccps_hc_rx_insert_options:1;
__u8 dccps_hc_tx_insert_options:1;
diff --git a/net/dccp/ccids/ccid3.c b/net/dccp/ccids/ccid3.c
index 145aafa..348e6fb 100644
--- a/net/dccp/ccids/ccid3.c
+++ b/net/dccp/ccids/ccid3.c
@@ -169,7 +169,7 @@
} else {
struct timeval now;
- do_gettimeofday(&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,
@@ -317,7 +317,7 @@
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:
@@ -382,7 +382,7 @@
return;
}
- do_gettimeofday(&now);
+ dccp_timestamp(sk, &now);
/* check if we have sent a data packet */
if (len > 0) {
@@ -461,6 +461,7 @@
struct ccid3_hc_tx_sock *hctx = dp->dccps_hc_tx_ccid_private;
struct ccid3_options_received *opt_recv;
struct dccp_tx_hist_entry *packet;
+ struct timeval now;
unsigned long next_tmout;
u32 t_elapsed;
u32 pinv;
@@ -508,7 +509,8 @@
}
/* Update RTT */
- r_sample = timeval_now_delta(&packet->dccphtx_tstamp);
+ 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",
@@ -774,7 +776,7 @@
ccid3_pr_debug("%s, sk=%p\n", dccp_role(sk), sk);
- do_gettimeofday(&now);
+ dccp_timestamp(sk, &now);
switch (hcrx->ccid3hcrx_state) {
case TFRC_RSTATE_NO_DATA:
@@ -903,10 +905,9 @@
if (rtt == 0)
rtt = 1;
- delta = timeval_now_delta(&hcrx->ccid3hcrx_tstamp_last_feedback);
- x_recv = hcrx->ccid3hcrx_bytes_recv * USEC_PER_SEC;
- if (likely(delta > 1))
- x_recv /= 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);
@@ -981,7 +982,7 @@
if (opt_recv->dccpor_timestamp_echo == 0)
break;
p_prev = hcrx->ccid3hcrx_rtt;
- do_gettimeofday(&now);
+ 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;
@@ -1013,7 +1014,7 @@
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 "
@@ -1045,7 +1046,7 @@
if (ins != 0)
break;
- do_gettimeofday(&now);
+ dccp_timestamp(sk, &now);
if (timeval_delta(&now, &hcrx->ccid3hcrx_tstamp_last_ack) >=
hcrx->ccid3hcrx_rtt) {
hcrx->ccid3hcrx_tstamp_last_ack = now;
@@ -1100,7 +1101,7 @@
hcrx->ccid3hcrx_state = TFRC_RSTATE_NO_DATA;
INIT_LIST_HEAD(&hcrx->ccid3hcrx_hist);
INIT_LIST_HEAD(&hcrx->ccid3hcrx_li_hist);
- do_gettimeofday(&hcrx->ccid3hcrx_tstamp_last_ack);
+ 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;
diff --git a/net/dccp/ccids/ccid3.h b/net/dccp/ccids/ccid3.h
index ee8cbac..58be612 100644
--- a/net/dccp/ccids/ccid3.h
+++ b/net/dccp/ccids/ccid3.h
@@ -115,7 +115,7 @@
u64 ccid3hcrx_seqno_last_counter:48,
ccid3hcrx_state:8,
ccid3hcrx_last_counter:4;
- unsigned long ccid3hcrx_rtt;
+ u32 ccid3hcrx_rtt;
u32 ccid3hcrx_p;
u32 ccid3hcrx_bytes_recv;
struct timeval ccid3hcrx_tstamp_last_feedback;
diff --git a/net/dccp/ccids/lib/packet_history.h b/net/dccp/ccids/lib/packet_history.h
index fb90a91..b375ebd 100644
--- a/net/dccp/ccids/lib/packet_history.h
+++ b/net/dccp/ccids/lib/packet_history.h
@@ -134,6 +134,7 @@
static inline struct dccp_rx_hist_entry *
dccp_rx_hist_entry_new(struct dccp_rx_hist *hist,
+ const struct sock *sk,
const u32 ndp,
const struct sk_buff *skb,
const unsigned int __nocast prio)
@@ -148,7 +149,7 @@
entry->dccphrx_ccval = dh->dccph_ccval;
entry->dccphrx_type = dh->dccph_type;
entry->dccphrx_ndp = ndp;
- do_gettimeofday(&(entry->dccphrx_tstamp));
+ dccp_timestamp(sk, &entry->dccphrx_tstamp);
}
return entry;
diff --git a/net/dccp/dccp.h b/net/dccp/dccp.h
index 33456c0..95c4630 100644
--- a/net/dccp/dccp.h
+++ b/net/dccp/dccp.h
@@ -426,10 +426,13 @@
dccp_ackpkts_alloc(unsigned int len,
const unsigned int __nocast priority);
extern void dccp_ackpkts_free(struct dccp_ackpkts *ap);
-extern int dccp_ackpkts_add(struct dccp_ackpkts *ap, u64 ackno, u8 state);
+extern int dccp_ackpkts_add(struct dccp_ackpkts *ap, const struct sock *sk,
+ u64 ackno, u8 state);
extern void dccp_ackpkts_check_rcv_ackno(struct dccp_ackpkts *ap,
struct sock *sk, u64 ackno);
+extern void dccp_timestamp(const struct sock *sk, struct timeval *tv);
+
static inline suseconds_t timeval_usecs(const struct timeval *tv)
{
return tv->tv_sec * USEC_PER_SEC + tv->tv_usec;
@@ -468,17 +471,6 @@
}
}
-/*
- * Returns the difference in usecs between timeval
- * passed in and current time
- */
-static inline suseconds_t timeval_now_delta(const struct timeval *tv)
-{
- struct timeval now;
- do_gettimeofday(&now);
- return timeval_delta(&now, tv);
-}
-
#ifdef CONFIG_IP_DCCP_DEBUG
extern void dccp_ackvector_print(const u64 ackno,
const unsigned char *vector, int len);
diff --git a/net/dccp/input.c b/net/dccp/input.c
index ef29cef..c60bc34 100644
--- a/net/dccp/input.c
+++ b/net/dccp/input.c
@@ -170,7 +170,7 @@
if (dp->dccps_options.dccpo_send_ack_vector) {
struct dccp_ackpkts *ap = dp->dccps_hc_rx_ackpkts;
- if (dccp_ackpkts_add(dp->dccps_hc_rx_ackpkts,
+ if (dccp_ackpkts_add(dp->dccps_hc_rx_ackpkts, sk,
DCCP_SKB_CB(skb)->dccpd_seq,
DCCP_ACKPKTS_STATE_RECEIVED)) {
LIMIT_NETDEBUG(KERN_WARNING "DCCP: acknowledgeable "
@@ -498,7 +498,7 @@
* DCCP_ACKPKTS_STATE_ECN_MARKED
*/
if (dp->dccps_options.dccpo_send_ack_vector) {
- if (dccp_ackpkts_add(dp->dccps_hc_rx_ackpkts,
+ if (dccp_ackpkts_add(dp->dccps_hc_rx_ackpkts, sk,
DCCP_SKB_CB(skb)->dccpd_seq,
DCCP_ACKPKTS_STATE_RECEIVED))
goto discard;
diff --git a/net/dccp/ipv4.c b/net/dccp/ipv4.c
index 3fc75db..fee9a8c 100644
--- a/net/dccp/ipv4.c
+++ b/net/dccp/ipv4.c
@@ -1243,6 +1243,7 @@
static int dccp_ctl_socket_init = 1;
dccp_options_init(&dp->dccps_options);
+ do_gettimeofday(&dp->dccps_epoch);
if (dp->dccps_options.dccpo_send_ack_vector) {
dp->dccps_hc_rx_ackpkts =
diff --git a/net/dccp/minisocks.c b/net/dccp/minisocks.c
index ce5dff4..18461bc 100644
--- a/net/dccp/minisocks.c
+++ b/net/dccp/minisocks.c
@@ -96,6 +96,7 @@
newdp->dccps_hc_rx_ackpkts = NULL;
newdp->dccps_role = DCCP_ROLE_SERVER;
newicsk->icsk_rto = DCCP_TIMEOUT_INIT;
+ do_gettimeofday(&newdp->dccps_epoch);
if (newdp->dccps_options.dccpo_send_ack_vector) {
newdp->dccps_hc_rx_ackpkts =
diff --git a/net/dccp/options.c b/net/dccp/options.c
index 34b230a..d4c4242 100644
--- a/net/dccp/options.c
+++ b/net/dccp/options.c
@@ -140,7 +140,7 @@
opt_recv->dccpor_timestamp = ntohl(*(u32 *)value);
dp->dccps_timestamp_echo = opt_recv->dccpor_timestamp;
- do_gettimeofday(&dp->dccps_timestamp_time);
+ dccp_timestamp(sk, &dp->dccps_timestamp_time);
dccp_pr_debug("%sTIMESTAMP=%u, ackno=%llu\n",
debug_prefix, opt_recv->dccpor_timestamp,
@@ -361,9 +361,13 @@
#endif
struct dccp_ackpkts *ap = dp->dccps_hc_rx_ackpkts;
int len = ap->dccpap_buf_vector_len + 2;
- const u32 elapsed_time = timeval_now_delta(&ap->dccpap_time) / 10;
+ struct timeval now;
+ u32 elapsed_time;
unsigned char *to, *from;
+ dccp_timestamp(sk, &now);
+ elapsed_time = timeval_delta(&now, &ap->dccpap_time) / 10;
+
if (elapsed_time != 0)
dccp_insert_option_elapsed_time(sk, skb, elapsed_time);
@@ -428,13 +432,29 @@
(unsigned long long) ap->dccpap_ack_ackno);
}
+void dccp_timestamp(const struct sock *sk, struct timeval *tv)
+{
+ const struct dccp_sock *dp = dccp_sk(sk);
+
+ do_gettimeofday(tv);
+ tv->tv_sec -= dp->dccps_epoch.tv_sec;
+ tv->tv_usec -= dp->dccps_epoch.tv_usec;
+
+ while (tv->tv_usec < 0) {
+ tv->tv_sec--;
+ tv->tv_usec += USEC_PER_SEC;
+ }
+}
+
+EXPORT_SYMBOL_GPL(dccp_timestamp);
+
void dccp_insert_option_timestamp(struct sock *sk, struct sk_buff *skb)
{
struct timeval tv;
u32 now;
- do_gettimeofday(&tv);
- now = (tv.tv_sec * USEC_PER_SEC + tv.tv_usec) / 10;
+ dccp_timestamp(sk, &tv);
+ now = timeval_usecs(&tv) / 10;
/* yes this will overflow but that is the point as we want a
* 10 usec 32 bit timer which mean it wraps every 11.9 hours */
@@ -452,13 +472,17 @@
const char *debug_prefix = dp->dccps_role == DCCP_ROLE_CLIENT ?
"CLIENT TX opt: " : "server TX opt: ";
#endif
+ struct timeval now;
u32 tstamp_echo;
- const u32 elapsed_time =
- timeval_now_delta(&dp->dccps_timestamp_time) / 10;
- const int elapsed_time_len = dccp_elapsed_time_len(elapsed_time);
- const int len = 6 + elapsed_time_len;
+ u32 elapsed_time;
+ int len, elapsed_time_len;
unsigned char *to;
+ dccp_timestamp(sk, &now);
+ elapsed_time = timeval_delta(&now, &dp->dccps_timestamp_time) / 10;
+ elapsed_time_len = dccp_elapsed_time_len(elapsed_time);
+ len = 6 + elapsed_time_len;
+
if (DCCP_SKB_CB(skb)->dccpd_opt_len + len > DCCP_MAX_OPT_LEN) {
LIMIT_NETDEBUG(KERN_INFO "DCCP: packet too small to insert "
"timestamp echo!\n");
@@ -623,7 +647,8 @@
/*
* Implements the draft-ietf-dccp-spec-11.txt Appendix A
*/
-int dccp_ackpkts_add(struct dccp_ackpkts *ap, u64 ackno, u8 state)
+int dccp_ackpkts_add(struct dccp_ackpkts *ap, const struct sock *sk,
+ u64 ackno, u8 state)
{
/*
* Check at the right places if the buffer is full, if it is, tell the
@@ -704,7 +729,7 @@
}
ap->dccpap_buf_ackno = ackno;
- do_gettimeofday(&ap->dccpap_time);
+ dccp_timestamp(sk, &ap->dccpap_time);
out:
dccp_pr_debug("");
dccp_ackpkts_print(ap);