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| author | Gerrit Renker <gerrit@erg.abdn.ac.uk> | 2006-11-27 20:29:27 -0200 |
|---|---|---|
| committer | David S. Miller <davem@sunset.davemloft.net> | 2006-12-02 21:30:50 -0800 |
| commit | 48e03eee715b9e19df03153f2bcce6413632afcb (patch) | |
| tree | 7a2995b3ac6bad9cac4309e97690dc0aa63a2868 /net/dccp/ccids | |
| parent | b798a9ede2b2434b9cbf0f3aee3e8598586fa89c (diff) | |
| download | linux-48e03eee715b9e19df03153f2bcce6413632afcb.tar.gz linux-48e03eee715b9e19df03153f2bcce6413632afcb.tar.bz2 linux-48e03eee715b9e19df03153f2bcce6413632afcb.zip | |
[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/dccp/ccids')
| -rw-r--r-- | net/dccp/ccids/ccid3.c | 18 | ||||
| -rw-r--r-- | net/dccp/ccids/ccid3.h | 2 |
2 files changed, 10 insertions, 10 deletions
diff --git a/net/dccp/ccids/ccid3.c b/net/dccp/ccids/ccid3.c index 6777a7f33a9a..9297fca78683 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 462165234ff6..970921700ce3 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 */ |