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33 #include <rte_atomic.h>
34 #include <rte_cycles.h>
37 #include "event_ring.h"
39 #define PORT_ENQUEUE_MAX_BURST_SIZE 64
42 sw_event_release(struct sw_port *p, uint8_t index)
45 * Drops the next outstanding event in our history. Used on dequeue
46 * to clear any history before dequeuing more events.
50 /* create drop message */
51 struct rte_event ev = {
52 .op = sw_qe_flag_map[RTE_EVENT_OP_RELEASE],
56 qe_ring_enqueue_burst(p->rx_worker_ring, &ev, 1, &free_count);
58 /* each release returns one credit */
59 p->outstanding_releases--;
60 p->inflight_credits++;
64 sw_event_enqueue_burst(void *port, const struct rte_event ev[], uint16_t num)
67 uint8_t new_ops[PORT_ENQUEUE_MAX_BURST_SIZE];
68 struct sw_port *p = port;
69 struct sw_evdev *sw = (void *)p->sw;
70 uint32_t sw_inflights = rte_atomic32_read(&sw->inflights);
72 if (unlikely(p->inflight_max < sw_inflights))
75 if (num > PORT_ENQUEUE_MAX_BURST_SIZE)
76 num = PORT_ENQUEUE_MAX_BURST_SIZE;
78 if (p->inflight_credits < num) {
79 /* check if event enqueue brings port over max threshold */
80 uint32_t credit_update_quanta = sw->credit_update_quanta;
81 if (sw_inflights + credit_update_quanta > sw->nb_events_limit)
84 rte_atomic32_add(&sw->inflights, credit_update_quanta);
85 p->inflight_credits += (credit_update_quanta);
87 if (p->inflight_credits < num)
91 for (i = 0; i < num; i++) {
93 int outstanding = p->outstanding_releases > 0;
94 const uint8_t invalid_qid = (ev[i].queue_id >= sw->qid_count);
96 p->inflight_credits -= (op == RTE_EVENT_OP_NEW);
97 p->inflight_credits += (op == RTE_EVENT_OP_RELEASE) *
100 new_ops[i] = sw_qe_flag_map[op];
101 new_ops[i] &= ~(invalid_qid << QE_FLAG_VALID_SHIFT);
103 /* FWD and RELEASE packets will both resolve to taken (assuming
104 * correct usage of the API), providing very high correct
107 if ((new_ops[i] & QE_FLAG_COMPLETE) && outstanding)
108 p->outstanding_releases--;
109 /* Branch to avoid touching p->stats except error case */
110 if (unlikely(invalid_qid))
111 p->stats.rx_dropped++;
114 /* returns number of events actually enqueued */
115 uint32_t enq = qe_ring_enqueue_burst_with_ops(p->rx_worker_ring, ev, i,
117 if (p->outstanding_releases == 0 && p->last_dequeue_burst_sz != 0) {
118 uint64_t burst_ticks = rte_get_timer_cycles() -
119 p->last_dequeue_ticks;
120 uint64_t burst_pkt_ticks =
121 burst_ticks / p->last_dequeue_burst_sz;
122 p->avg_pkt_ticks -= p->avg_pkt_ticks / NUM_SAMPLES;
123 p->avg_pkt_ticks += burst_pkt_ticks / NUM_SAMPLES;
124 p->last_dequeue_ticks = 0;
130 sw_event_enqueue(void *port, const struct rte_event *ev)
132 return sw_event_enqueue_burst(port, ev, 1);
136 sw_event_dequeue_burst(void *port, struct rte_event *ev, uint16_t num,
140 struct sw_port *p = (void *)port;
141 struct sw_evdev *sw = (void *)p->sw;
142 struct qe_ring *ring = p->cq_worker_ring;
143 uint32_t credit_update_quanta = sw->credit_update_quanta;
145 /* check that all previous dequeues have been released */
146 if (!p->is_directed) {
147 uint16_t out_rels = p->outstanding_releases;
149 for (i = 0; i < out_rels; i++)
150 sw_event_release(p, i);
153 /* returns number of events actually dequeued */
154 uint16_t ndeq = qe_ring_dequeue_burst(ring, ev, num);
155 if (unlikely(ndeq == 0)) {
156 p->outstanding_releases = 0;
162 /* only add credits for directed ports - LB ports send RELEASEs */
163 p->inflight_credits += ndeq * p->is_directed;
164 p->outstanding_releases = ndeq;
165 p->last_dequeue_burst_sz = ndeq;
166 p->last_dequeue_ticks = rte_get_timer_cycles();
167 p->poll_buckets[(ndeq - 1) >> SW_DEQ_STAT_BUCKET_SHIFT]++;
171 if (p->inflight_credits >= credit_update_quanta * 2 &&
172 p->inflight_credits > credit_update_quanta + ndeq) {
173 rte_atomic32_sub(&sw->inflights, credit_update_quanta);
174 p->inflight_credits -= credit_update_quanta;
180 sw_event_dequeue(void *port, struct rte_event *ev, uint64_t wait)
182 return sw_event_dequeue_burst(port, ev, 1, wait);