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sch_netem: replace magic numbers with enumerate in GE model

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Replace some magic numbers which describe states of GE model
loss generator with enumerate.

Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Yang Yingliang 2014-02-14 10:30:43 +08:00 committed by David S. Miller
parent 49545a7775
commit c045a734da
1 changed files with 9 additions and 4 deletions
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13
net/sched/sch_netem.c
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@ -117,6 +117,11 @@ struct netem_sched_data {
LOST_IN_BURST_PERIOD,
} _4_state_model;
enum {
GOOD_STATE = 1,
BAD_STATE,
} GE_state_model;
/* Correlated Loss Generation models */
struct clgstate {
/* state of the Markov chain */
@ -272,15 +277,15 @@ static bool loss_gilb_ell(struct netem_sched_data *q)
struct clgstate *clg = &q->clg;
switch (clg->state) {
case 1:
case GOOD_STATE:
if (prandom_u32() < clg->a1)
clg->state = 2;
clg->state = BAD_STATE;
if (prandom_u32() < clg->a4)
return true;
break;
case 2:
case BAD_STATE:
if (prandom_u32() < clg->a2)
clg->state = 1;
clg->state = GOOD_STATE;
if (prandom_u32() > clg->a3)
return true;
}