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sch_netem: replace magic numbers with enumerate
Replace some magic numbers which describe states of 4-state model loss generator with enumerate. Signed-off-by: Yang Yingliang <yangyingliang@huawei.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -110,6 +110,13 @@ struct netem_sched_data {
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CLG_GILB_ELL,
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} loss_model;
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enum {
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TX_IN_GAP_PERIOD = 1,
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TX_IN_BURST_PERIOD,
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LOST_IN_GAP_PERIOD,
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LOST_IN_BURST_PERIOD,
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} _4_state_model;
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/* Correlated Loss Generation models */
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struct clgstate {
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/* state of the Markov chain */
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@ -205,43 +212,45 @@ static bool loss_4state(struct netem_sched_data *q)
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* probabilities outgoing from the current state, then decides the
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* next state and if the next packet has to be transmitted or lost.
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* The four states correspond to:
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* 1 => successfully transmitted packets within a gap period
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* 4 => isolated losses within a gap period
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* 3 => lost packets within a burst period
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* 2 => successfully transmitted packets within a burst period
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* TX_IN_GAP_PERIOD => successfully transmitted packets within a gap period
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* LOST_IN_BURST_PERIOD => isolated losses within a gap period
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* LOST_IN_GAP_PERIOD => lost packets within a burst period
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* TX_IN_GAP_PERIOD => successfully transmitted packets within a burst period
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*/
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switch (clg->state) {
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case 1:
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case TX_IN_GAP_PERIOD:
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if (rnd < clg->a4) {
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clg->state = 4;
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clg->state = LOST_IN_BURST_PERIOD;
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return true;
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} else if (clg->a4 < rnd && rnd < clg->a1 + clg->a4) {
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clg->state = 3;
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clg->state = LOST_IN_GAP_PERIOD;
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return true;
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} else if (clg->a1 + clg->a4 < rnd)
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clg->state = 1;
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} else if (clg->a1 + clg->a4 < rnd) {
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clg->state = TX_IN_GAP_PERIOD;
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}
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break;
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case 2:
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case TX_IN_BURST_PERIOD:
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if (rnd < clg->a5) {
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clg->state = 3;
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clg->state = LOST_IN_GAP_PERIOD;
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return true;
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} else
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clg->state = 2;
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} else {
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clg->state = TX_IN_BURST_PERIOD;
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}
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break;
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case 3:
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case LOST_IN_GAP_PERIOD:
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if (rnd < clg->a3)
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clg->state = 2;
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clg->state = TX_IN_BURST_PERIOD;
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else if (clg->a3 < rnd && rnd < clg->a2 + clg->a3) {
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clg->state = 1;
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clg->state = TX_IN_GAP_PERIOD;
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} else if (clg->a2 + clg->a3 < rnd) {
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clg->state = 3;
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clg->state = LOST_IN_GAP_PERIOD;
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return true;
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}
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break;
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case 4:
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clg->state = 1;
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case LOST_IN_BURST_PERIOD:
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clg->state = TX_IN_GAP_PERIOD;
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break;
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}
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