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authorGerrit Renker <gerrit@erg.abdn.ac.uk>2006-11-27 20:29:27 -0200
committerDavid S. Miller <davem@sunset.davemloft.net>2006-12-02 21:30:50 -0800
commit48e03eee715b9e19df03153f2bcce6413632afcb (patch)
tree7a2995b3ac6bad9cac4309e97690dc0aa63a2868 /net
parentb798a9ede2b2434b9cbf0f3aee3e8598586fa89c (diff)
[DCCP] ccid3: Consolidate timer resets
This patch concerns updating the value of the nofeedback timer when no feedback has been received so far. Since in this case the value of R is still undefined according to [RFC 3448, 4.2], we can not perform step (3) of [RFC 3448, 4.3]. A clarification is provided in [RFC 4342, sec. 5], which states that in these cases the nofeedback timer (still) expires "after two seconds". Many thanks to Ian McDonald for pointing this out and providing the clarification. The patch * implements [RFC 4342, sec. 5] with regard to the above case * consolidates handling timer restart by - adding an appropriate jump label and - initialising the timeout value Acked-by: Ian McDonald <ian.mcdonald@jandi.co.nz> Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk> Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Diffstat (limited to 'net')
-rw-r--r--net/dccp/ccids/ccid3.c18
-rw-r--r--net/dccp/ccids/ccid3.h2
2 files changed, 10 insertions, 10 deletions
diff --git a/net/dccp/ccids/ccid3.c b/net/dccp/ccids/ccid3.c
index 6777a7f33a9..9297fca7868 100644
--- a/net/dccp/ccids/ccid3.c
+++ b/net/dccp/ccids/ccid3.c
@@ -154,16 +154,14 @@ static void ccid3_hc_tx_update_x(struct sock *sk)
static void ccid3_hc_tx_no_feedback_timer(unsigned long data)
{
struct sock *sk = (struct sock *)data;
- unsigned long next_tmout = 0;
struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
+ unsigned long next_tmout = USEC_PER_SEC / 5;
bh_lock_sock(sk);
if (sock_owned_by_user(sk)) {
/* Try again later. */
/* XXX: set some sensible MIB */
- sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer,
- jiffies + HZ / 5);
- goto out;
+ goto restart_timer;
}
ccid3_pr_debug("%s, sk=%p, state=%s\n", dccp_role(sk), sk,
@@ -183,9 +181,9 @@ static void ccid3_hc_tx_no_feedback_timer(unsigned long data)
dccp_role(sk), sk,
ccid3_tx_state_name(hctx->ccid3hctx_state),
hctx->ccid3hctx_x);
- next_tmout = max_t(u32, 2 * usecs_div(hctx->ccid3hctx_s,
- hctx->ccid3hctx_x),
- TFRC_INITIAL_TIMEOUT);
+ /* The value of R is still undefined and so we can not recompute
+ * the timout value. Keep initial value as per [RFC 4342, 5]. */
+ next_tmout = TFRC_INITIAL_TIMEOUT;
/*
* FIXME - not sure above calculation is correct. See section
* 5 of CCID3 11 should adjust tx_t_ipi and double that to
@@ -239,9 +237,11 @@ static void ccid3_hc_tx_no_feedback_timer(unsigned long data)
goto out;
}
- sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer,
- jiffies + max_t(u32, 1, usecs_to_jiffies(next_tmout)));
hctx->ccid3hctx_idle = 1;
+
+restart_timer:
+ sk_reset_timer(sk, &hctx->ccid3hctx_no_feedback_timer,
+ jiffies + usecs_to_jiffies(next_tmout));
out:
bh_unlock_sock(sk);
sock_put(sk);
diff --git a/net/dccp/ccids/ccid3.h b/net/dccp/ccids/ccid3.h
index 462165234ff..970921700ce 100644
--- a/net/dccp/ccids/ccid3.h
+++ b/net/dccp/ccids/ccid3.h
@@ -46,7 +46,7 @@
#define TFRC_STD_PACKET_SIZE 256
#define TFRC_MAX_PACKET_SIZE 65535
-/* Two seconds as per CCID3 spec */
+/* Two seconds as per RFC 3448 4.2 */
#define TFRC_INITIAL_TIMEOUT (2 * USEC_PER_SEC)
/* In usecs - half the scheduling granularity as per RFC3448 4.6 */