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sch: make htb_rate_cfg and functions around that generic

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As it is going to be used in tbf as well, push these to generic code.

Signed-off-by: Jiri Pirko <jiri@resnulli.us>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jiri Pirko
2013-02-12 00:12:03 +00:00
committed by David S. Miller
parent b9a7afdefd
commit 292f1c7ff6
3 changed files with 65 additions and 56 deletions
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37
net/sched/sch_generic.c
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@@ -25,6 +25,7 @@
#include <linux/rcupdate.h>
#include <linux/list.h>
#include <linux/slab.h>
#include <net/sch_generic.h>
#include <net/pkt_sched.h>
#include <net/dst.h>
@@ -896,3 +897,39 @@ void dev_shutdown(struct net_device *dev)
WARN_ON(timer_pending(&dev->watchdog_timer));
}
void psched_ratecfg_precompute(struct psched_ratecfg *r, u32 rate)
{
u64 factor;
u64 mult;
int shift;
r->rate_bps = rate << 3;
r->shift = 0;
r->mult = 1;
/*
* Calibrate mult, shift so that token counting is accurate
* for smallest packet size (64 bytes). Token (time in ns) is
* computed as (bytes * 8) * NSEC_PER_SEC / rate_bps. It will
* work as long as the smallest packet transfer time can be
* accurately represented in nanosec.
*/
if (r->rate_bps > 0) {
/*
* Higher shift gives better accuracy. Find the largest
* shift such that mult fits in 32 bits.
*/
for (shift = 0; shift < 16; shift++) {
r->shift = shift;
factor = 8LLU * NSEC_PER_SEC * (1 << r->shift);
mult = div64_u64(factor, r->rate_bps);
if (mult > UINT_MAX)
break;
}
r->shift = shift - 1;
factor = 8LLU * NSEC_PER_SEC * (1 << r->shift);
r->mult = div64_u64(factor, r->rate_bps);
}
}
EXPORT_SYMBOL(psched_ratecfg_precompute);