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net_sched: psched_ratecfg_precompute() improvements

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Before allowing 64bits bytes rates, refactor
psched_ratecfg_precompute() to get better comments
and increased accuracy.

rate_bps field is renamed to rate_bytes_ps, as we only
have to worry about bytes per second.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Ben Greear <greearb@candelatech.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2013-06-06 13:56:19 -07:00 • committed by David S. Miller
commit 130d3d68b5
2 changed files with 23 additions and 27 deletions
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4
include/net/sch_generic.h
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@ -680,7 +680,7 @@ static inline struct sk_buff *skb_act_clone(struct sk_buff *skb, gfp_t gfp_mask,
#endif
struct psched_ratecfg {
u64 rate_bps;
u64 rate_bytes_ps; /* bytes per second */
u32 mult;
u16 overhead;
u8 shift;
@ -698,7 +698,7 @@ static inline void psched_ratecfg_getrate(struct tc_ratespec *res,
const struct psched_ratecfg *r)
{
memset(res, 0, sizeof(*res));
res->rate = r->rate_bps >> 3;
res->rate = r->rate_bytes_ps;
res->overhead = r->overhead;
}