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authorArnaldo Carvalho de Melo <acme@redhat.com>2007-11-29 22:47:15 -0200
committerDavid S. Miller <davem@davemloft.net>2008-01-28 14:55:19 -0800
commit9108d5f4b2cd82f55ad178caa0be66a866a06dcc (patch)
treec706ab8146fa93ab56c72037b7daa2a6f78e4062 /net/dccp
parent95bdfccb2bf4ea21c0065772c6a2c75cbaf6ad0d (diff)
downloadlinux-9108d5f4b2cd82f55ad178caa0be66a866a06dcc.tar.bz2
[TFRC]: Hide tx history details from the CCIDs
Based on a previous patch by Gerrit Renker. Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/dccp')
-rw-r--r--net/dccp/ccids/ccid3.c19
-rw-r--r--net/dccp/ccids/lib/packet_history.c33
-rw-r--r--net/dccp/ccids/lib/packet_history.h17
3 files changed, 41 insertions, 28 deletions
diff --git a/net/dccp/ccids/ccid3.c b/net/dccp/ccids/ccid3.c
index f73542ab9d08..49338370eb04 100644
--- a/net/dccp/ccids/ccid3.c
+++ b/net/dccp/ccids/ccid3.c
@@ -399,7 +399,6 @@ static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb)
{
struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
struct ccid3_options_received *opt_recv;
- struct tfrc_tx_hist_entry *packet;
ktime_t now;
unsigned long t_nfb;
u32 pinv, r_sample;
@@ -414,19 +413,17 @@ static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb)
switch (hctx->ccid3hctx_state) {
case TFRC_SSTATE_NO_FBACK:
case TFRC_SSTATE_FBACK:
+ now = ktime_get_real();
+
/* estimate RTT from history if ACK number is valid */
- packet = tfrc_tx_hist_find_entry(hctx->ccid3hctx_hist,
- DCCP_SKB_CB(skb)->dccpd_ack_seq);
- if (packet == NULL) {
+ r_sample = tfrc_tx_hist_rtt(hctx->ccid3hctx_hist,
+ DCCP_SKB_CB(skb)->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(DCCP_SKB_CB(skb)->dccpd_type),
(unsigned long long)DCCP_SKB_CB(skb)->dccpd_ack_seq);
return;
}
- /*
- * Garbage-collect older (irrelevant) entries
- */
- tfrc_tx_hist_purge(&packet->next);
/* Update receive rate in units of 64 * bytes/second */
hctx->ccid3hctx_x_recv = opt_recv->ccid3or_receive_rate;
@@ -438,12 +435,10 @@ static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb)
hctx->ccid3hctx_p = 0;
else /* can not exceed 100% */
hctx->ccid3hctx_p = 1000000 / pinv;
-
- now = ktime_get_real();
/*
- * Calculate new RTT sample and update moving average
+ * Validate new RTT sample and update moving average
*/
- r_sample = dccp_sample_rtt(sk, ktime_us_delta(now, packet->stamp));
+ r_sample = dccp_sample_rtt(sk, r_sample);
hctx->ccid3hctx_rtt = tfrc_ewma(hctx->ccid3hctx_rtt, r_sample, 9);
if (hctx->ccid3hctx_state == TFRC_SSTATE_NO_FBACK) {
diff --git a/net/dccp/ccids/lib/packet_history.c b/net/dccp/ccids/lib/packet_history.c
index 139736064713..4805de996568 100644
--- a/net/dccp/ccids/lib/packet_history.c
+++ b/net/dccp/ccids/lib/packet_history.c
@@ -39,12 +39,24 @@
#include <linux/string.h>
#include "packet_history.h"
+/**
+ * tfrc_tx_hist_entry - Simple singly-linked TX history list
+ * @next: next oldest entry (LIFO order)
+ * @seqno: sequence number of this entry
+ * @stamp: send time of packet with sequence number @seqno
+ */
+struct tfrc_tx_hist_entry {
+ struct tfrc_tx_hist_entry *next;
+ u64 seqno;
+ ktime_t stamp;
+};
+
/*
* Transmitter History Routines
*/
static struct kmem_cache *tfrc_tx_hist;
-struct tfrc_tx_hist_entry *
+static struct tfrc_tx_hist_entry *
tfrc_tx_hist_find_entry(struct tfrc_tx_hist_entry *head, u64 seqno)
{
while (head != NULL && head->seqno != seqno)
@@ -52,7 +64,6 @@ struct tfrc_tx_hist_entry *
return head;
}
-EXPORT_SYMBOL_GPL(tfrc_tx_hist_find_entry);
int tfrc_tx_hist_add(struct tfrc_tx_hist_entry **headp, u64 seqno)
{
@@ -83,6 +94,24 @@ void tfrc_tx_hist_purge(struct tfrc_tx_hist_entry **headp)
}
EXPORT_SYMBOL_GPL(tfrc_tx_hist_purge);
+u32 tfrc_tx_hist_rtt(struct tfrc_tx_hist_entry *head, const u64 seqno,
+ const ktime_t now)
+{
+ u32 rtt = 0;
+ struct tfrc_tx_hist_entry *packet = tfrc_tx_hist_find_entry(head, seqno);
+
+ if (packet != NULL) {
+ rtt = ktime_us_delta(now, packet->stamp);
+ /*
+ * Garbage-collect older (irrelevant) entries:
+ */
+ tfrc_tx_hist_purge(&packet->next);
+ }
+
+ return rtt;
+}
+EXPORT_SYMBOL_GPL(tfrc_tx_hist_rtt);
+
/*
* Receiver History Routines
*/
diff --git a/net/dccp/ccids/lib/packet_history.h b/net/dccp/ccids/lib/packet_history.h
index 5c07182dd659..0670f46dd53c 100644
--- a/net/dccp/ccids/lib/packet_history.h
+++ b/net/dccp/ccids/lib/packet_history.h
@@ -48,23 +48,12 @@
#define TFRC_WIN_COUNT_PER_RTT 4
#define TFRC_WIN_COUNT_LIMIT 16
-/**
- * tfrc_tx_hist_entry - Simple singly-linked TX history list
- * @next: next oldest entry (LIFO order)
- * @seqno: sequence number of this entry
- * @stamp: send time of packet with sequence number @seqno
- */
-struct tfrc_tx_hist_entry {
- struct tfrc_tx_hist_entry *next;
- u64 seqno;
- ktime_t stamp;
-};
+struct tfrc_tx_hist_entry;
extern int tfrc_tx_hist_add(struct tfrc_tx_hist_entry **headp, u64 seqno);
extern void tfrc_tx_hist_purge(struct tfrc_tx_hist_entry **headp);
-
-extern struct tfrc_tx_hist_entry *
- tfrc_tx_hist_find_entry(struct tfrc_tx_hist_entry *head, u64 ackno);
+extern u32 tfrc_tx_hist_rtt(struct tfrc_tx_hist_entry *head,
+ const u64 seqno, const ktime_t now);
/*
* Receiver History data structures and declarations