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dccp: Clamping RTT values 

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@erg.abdn.ac.uk>
This commit is contained in:
Gerrit Renker 2008-09-04 07:30:19 +02:00
parent 2b81143aa3
commit 49ffc29a02
2 changed files with 9 additions and 11 deletions
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9
net/dccp/dccp.h
View File

@ -334,7 +334,14 @@ 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 int dccp_send_reset(struct sock *sk, enum dccp_reset_codes code);
extern void dccp_send_close(struct sock *sk, const int active); extern void dccp_send_close(struct sock *sk, const int active);
extern int dccp_invalid_packet(struct sk_buff *skb); 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, static inline int dccp_bad_service_code(const struct sock *sk,
const __be32 service) const __be32 service)

11
net/dccp/input.c
View File

@ -707,16 +707,7 @@ u32 dccp_sample_rtt(struct sock *sk, long delta)
/* dccpor_elapsed_time is either zeroed out or set and > 0 */ /* dccpor_elapsed_time is either zeroed out or set and > 0 */
delta -= dccp_sk(sk)->dccps_options_received.dccpor_elapsed_time * 10; delta -= dccp_sk(sk)->dccps_options_received.dccpor_elapsed_time * 10;
if (unlikely(delta <= 0)) { return dccp_sane_rtt(delta);
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;
} }
EXPORT_SYMBOL_GPL(dccp_sample_rtt); EXPORT_SYMBOL_GPL(dccp_sample_rtt);