diff options
| -rw-r--r-- | net/sched/sch_netem.c | 47 |
1 files changed, 28 insertions, 19 deletions
diff --git a/net/sched/sch_netem.c b/net/sched/sch_netem.c index 3019c10d6c56..a2bfc371b44a 100644 --- a/net/sched/sch_netem.c +++ b/net/sched/sch_netem.c @@ -110,6 +110,13 @@ struct netem_sched_data { CLG_GILB_ELL, } loss_model; + enum { + TX_IN_GAP_PERIOD = 1, + TX_IN_BURST_PERIOD, + LOST_IN_GAP_PERIOD, + LOST_IN_BURST_PERIOD, + } _4_state_model; + /* Correlated Loss Generation models */ struct clgstate { /* state of the Markov chain */ @@ -205,43 +212,45 @@ static bool loss_4state(struct netem_sched_data *q) * probabilities outgoing from the current state, then decides the * next state and if the next packet has to be transmitted or lost. * The four states correspond to: - * 1 => successfully transmitted packets within a gap period - * 4 => isolated losses within a gap period - * 3 => lost packets within a burst period - * 2 => successfully transmitted packets within a burst period + * TX_IN_GAP_PERIOD => successfully transmitted packets within a gap period + * LOST_IN_BURST_PERIOD => isolated losses within a gap period + * LOST_IN_GAP_PERIOD => lost packets within a burst period + * TX_IN_GAP_PERIOD => successfully transmitted packets within a burst period */ switch (clg->state) { - case 1: + case TX_IN_GAP_PERIOD: if (rnd < clg->a4) { - clg->state = 4; + clg->state = LOST_IN_BURST_PERIOD; return true; } else if (clg->a4 < rnd && rnd < clg->a1 + clg->a4) { - clg->state = 3; + clg->state = LOST_IN_GAP_PERIOD; return true; - } else if (clg->a1 + clg->a4 < rnd) - clg->state = 1; + } else if (clg->a1 + clg->a4 < rnd) { + clg->state = TX_IN_GAP_PERIOD; + } break; - case 2: + case TX_IN_BURST_PERIOD: if (rnd < clg->a5) { - clg->state = 3; + clg->state = LOST_IN_GAP_PERIOD; return true; - } else - clg->state = 2; + } else { + clg->state = TX_IN_BURST_PERIOD; + } break; - case 3: + case LOST_IN_GAP_PERIOD: if (rnd < clg->a3) - clg->state = 2; + clg->state = TX_IN_BURST_PERIOD; else if (clg->a3 < rnd && rnd < clg->a2 + clg->a3) { - clg->state = 1; + clg->state = TX_IN_GAP_PERIOD; } else if (clg->a2 + clg->a3 < rnd) { - clg->state = 3; + clg->state = LOST_IN_GAP_PERIOD; return true; } break; - case 4: - clg->state = 1; + case LOST_IN_BURST_PERIOD: + clg->state = TX_IN_GAP_PERIOD; break; } |