diff options
Diffstat (limited to 'drivers/event/sw/sw_evdev_worker.c')
| -rw-r--r-- | drivers/event/sw/sw_evdev_worker.c | 185 |
1 files changed, 185 insertions, 0 deletions
diff --git a/drivers/event/sw/sw_evdev_worker.c b/drivers/event/sw/sw_evdev_worker.c new file mode 100644 index 00000000..9cb6bef5 --- /dev/null +++ b/drivers/event/sw/sw_evdev_worker.c @@ -0,0 +1,185 @@ +/*- + * BSD LICENSE + * + * Copyright(c) 2016-2017 Intel Corporation. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * * Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * * Neither the name of Intel Corporation nor the names of its + * contributors may be used to endorse or promote products derived + * from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#include <rte_atomic.h> +#include <rte_cycles.h> + +#include "sw_evdev.h" +#include "event_ring.h" + +#define PORT_ENQUEUE_MAX_BURST_SIZE 64 + +static inline void +sw_event_release(struct sw_port *p, uint8_t index) +{ + /* + * Drops the next outstanding event in our history. Used on dequeue + * to clear any history before dequeuing more events. + */ + RTE_SET_USED(index); + + /* create drop message */ + struct rte_event ev; + ev.op = sw_qe_flag_map[RTE_EVENT_OP_RELEASE]; + + uint16_t free_count; + qe_ring_enqueue_burst(p->rx_worker_ring, &ev, 1, &free_count); + + /* each release returns one credit */ + p->outstanding_releases--; + p->inflight_credits++; +} + +uint16_t +sw_event_enqueue_burst(void *port, const struct rte_event ev[], uint16_t num) +{ + int32_t i; + uint8_t new_ops[PORT_ENQUEUE_MAX_BURST_SIZE]; + struct sw_port *p = port; + struct sw_evdev *sw = (void *)p->sw; + uint32_t sw_inflights = rte_atomic32_read(&sw->inflights); + + if (unlikely(p->inflight_max < sw_inflights)) + return 0; + + if (num > PORT_ENQUEUE_MAX_BURST_SIZE) + num = PORT_ENQUEUE_MAX_BURST_SIZE; + + if (p->inflight_credits < num) { + /* check if event enqueue brings port over max threshold */ + uint32_t credit_update_quanta = sw->credit_update_quanta; + if (sw_inflights + credit_update_quanta > sw->nb_events_limit) + return 0; + + rte_atomic32_add(&sw->inflights, credit_update_quanta); + p->inflight_credits += (credit_update_quanta); + + if (p->inflight_credits < num) + return 0; + } + + for (i = 0; i < num; i++) { + int op = ev[i].op; + int outstanding = p->outstanding_releases > 0; + const uint8_t invalid_qid = (ev[i].queue_id >= sw->qid_count); + + p->inflight_credits -= (op == RTE_EVENT_OP_NEW); + p->inflight_credits += (op == RTE_EVENT_OP_RELEASE) * + outstanding; + + new_ops[i] = sw_qe_flag_map[op]; + new_ops[i] &= ~(invalid_qid << QE_FLAG_VALID_SHIFT); + + /* FWD and RELEASE packets will both resolve to taken (assuming + * correct usage of the API), providing very high correct + * prediction rate. + */ + if ((new_ops[i] & QE_FLAG_COMPLETE) && outstanding) + p->outstanding_releases--; + + /* error case: branch to avoid touching p->stats */ + if (unlikely(invalid_qid)) { + p->stats.rx_dropped++; + p->inflight_credits++; + } + } + + /* returns number of events actually enqueued */ + uint32_t enq = qe_ring_enqueue_burst_with_ops(p->rx_worker_ring, ev, i, + new_ops); + if (p->outstanding_releases == 0 && p->last_dequeue_burst_sz != 0) { + uint64_t burst_ticks = rte_get_timer_cycles() - + p->last_dequeue_ticks; + uint64_t burst_pkt_ticks = + burst_ticks / p->last_dequeue_burst_sz; + p->avg_pkt_ticks -= p->avg_pkt_ticks / NUM_SAMPLES; + p->avg_pkt_ticks += burst_pkt_ticks / NUM_SAMPLES; + p->last_dequeue_ticks = 0; + } + return enq; +} + +uint16_t +sw_event_enqueue(void *port, const struct rte_event *ev) +{ + return sw_event_enqueue_burst(port, ev, 1); +} + +uint16_t +sw_event_dequeue_burst(void *port, struct rte_event *ev, uint16_t num, + uint64_t wait) +{ + RTE_SET_USED(wait); + struct sw_port *p = (void *)port; + struct sw_evdev *sw = (void *)p->sw; + struct qe_ring *ring = p->cq_worker_ring; + uint32_t credit_update_quanta = sw->credit_update_quanta; + + /* check that all previous dequeues have been released */ + if (!p->is_directed) { + uint16_t out_rels = p->outstanding_releases; + uint16_t i; + for (i = 0; i < out_rels; i++) + sw_event_release(p, i); + } + + /* returns number of events actually dequeued */ + uint16_t ndeq = qe_ring_dequeue_burst(ring, ev, num); + if (unlikely(ndeq == 0)) { + p->outstanding_releases = 0; + p->zero_polls++; + p->total_polls++; + goto end; + } + + /* only add credits for directed ports - LB ports send RELEASEs */ + p->inflight_credits += ndeq * p->is_directed; + p->outstanding_releases = ndeq; + p->last_dequeue_burst_sz = ndeq; + p->last_dequeue_ticks = rte_get_timer_cycles(); + p->poll_buckets[(ndeq - 1) >> SW_DEQ_STAT_BUCKET_SHIFT]++; + p->total_polls++; + +end: + if (p->inflight_credits >= credit_update_quanta * 2 && + p->inflight_credits > credit_update_quanta + ndeq) { + rte_atomic32_sub(&sw->inflights, credit_update_quanta); + p->inflight_credits -= credit_update_quanta; + } + return ndeq; +} + +uint16_t +sw_event_dequeue(void *port, struct rte_event *ev, uint64_t wait) +{ + return sw_event_dequeue_burst(port, ev, 1, wait); +} |