This extracts the clamping part of dccp_sample_rtt() and makes it available
to other parts of the code (as e.g. used in the next patch).
Note: The function dccp_sample_rtt() now reduces to subtracting the elapsed
time. This could be eliminated but would require shorter prefixes and thus
is not done by this patch - maybe an idea for later.
Signed-off-by: Gerrit Renker <gerrit@xxxxxxxxxxxxxx>
---
net/dccp/dccp.h | 9 ++++++++-
net/dccp/input.c | 11 +----------
2 files changed, 9 insertions(+), 11 deletions(-)
--- a/net/dccp/dccp.h
+++ b/net/dccp/dccp.h
@@ -333,7 +333,14 @@ extern struct sk_buff *dccp_ctl_make_reset(struct sock *sk,
extern int dccp_send_reset(struct sock *sk, enum dccp_reset_codes code);
extern void dccp_send_close(struct sock *sk, const int active);
extern int dccp_invalid_packet(struct sk_buff *skb);
-extern u32 dccp_sample_rtt(struct sock *sk, long delta);
+
+static inline u32 dccp_sane_rtt(long usec_sample)
+{
+ if (unlikely(usec_sample <= 0 || usec_sample > DCCP_SANE_RTT_MAX))
+ DCCP_WARN("RTT sample %ld out of bounds!\n", usec_sample);
+ return clamp_val(usec_sample, DCCP_SANE_RTT_MIN, DCCP_SANE_RTT_MAX);
+}
+extern u32 dccp_sample_rtt(struct sock *sk, long delta);
static inline int dccp_bad_service_code(const struct sock *sk,
const __be32 service)
--- a/net/dccp/input.c
+++ b/net/dccp/input.c
@@ -707,16 +707,7 @@ u32 dccp_sample_rtt(struct sock *sk, long delta)
/* dccpor_elapsed_time is either zeroed out or set and > 0 */
delta -= dccp_sk(sk)->dccps_options_received.dccpor_elapsed_time * 10;
- if (unlikely(delta <= 0)) {
- DCCP_WARN("unusable RTT sample %ld, using min\n", delta);
- return DCCP_SANE_RTT_MIN;
- }
- if (unlikely(delta > DCCP_SANE_RTT_MAX)) {
- DCCP_WARN("RTT sample %ld too large, using max\n", delta);
- return DCCP_SANE_RTT_MAX;
- }
-
- return delta;
+ return dccp_sane_rtt(delta);
}
EXPORT_SYMBOL_GPL(dccp_sample_rtt);
--
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