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| author | Gerrit Renker <gerrit@erg.abdn.ac.uk> | 2008-09-04 07:30:19 +0200 |
|---|---|---|
| committer | Gerrit Renker <gerrit@erg.abdn.ac.uk> | 2008-09-04 07:45:41 +0200 |
| commit | 49ffc29a0223adbe0ea7005eea3ab2a03abbeb06 (patch) | |
| tree | d7bf19858c85b5dbb6bded3f543fbf8a6a355a2e /net | |
| parent | dccp ccid-3: Always perform receiver RTT sampling (diff) | |
| download | linux-49ffc29a0223adbe0ea7005eea3ab2a03abbeb06.tar.xz linux-49ffc29a0223adbe0ea7005eea3ab2a03abbeb06.zip | |
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>
Diffstat (limited to 'net')
| -rw-r--r-- | net/dccp/dccp.h | 9 | ||||
| -rw-r--r-- | net/dccp/input.c | 11 |
2 files changed, 9 insertions, 11 deletions
diff --git a/net/dccp/dccp.h b/net/dccp/dccp.h index b63a82ccb2b2..5281190aa19c 100644 --- a/net/dccp/dccp.h +++ b/net/dccp/dccp.h @@ -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 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) diff --git a/net/dccp/input.c b/net/dccp/input.c index b1e38bf94456..df0e6714aa11 100644 --- 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); |