5566a3e358
Replace the BSD license header with the SPDX tag for files with only an Intel copyright on them. Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
154 lines
3.4 KiB
C
154 lines
3.4 KiB
C
/* SPDX-License-Identifier: BSD-3-Clause
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* Copyright(c) 2016-2017 Intel Corporation
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*/
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/*
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* Generic ring structure for passing events from one core to another.
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*
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* Used by the software scheduler for the producer and consumer rings for
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* each port, i.e. for passing events from worker cores to scheduler and
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* vice-versa. Designed for single-producer, single-consumer use with two
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* cores working on each ring.
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*/
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#ifndef _EVENT_RING_
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#define _EVENT_RING_
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#include <stdint.h>
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#include <rte_common.h>
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#include <rte_memory.h>
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#include <rte_malloc.h>
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#define QE_RING_NAMESIZE 32
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struct qe_ring {
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char name[QE_RING_NAMESIZE] __rte_cache_aligned;
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uint32_t ring_size; /* size of memory block allocated to the ring */
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uint32_t mask; /* mask for read/write values == ring_size -1 */
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uint32_t size; /* actual usable space in the ring */
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volatile uint32_t write_idx __rte_cache_aligned;
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volatile uint32_t read_idx __rte_cache_aligned;
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struct rte_event ring[0] __rte_cache_aligned;
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};
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static inline struct qe_ring *
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qe_ring_create(const char *name, unsigned int size, unsigned int socket_id)
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{
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struct qe_ring *retval;
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const uint32_t ring_size = rte_align32pow2(size + 1);
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size_t memsize = sizeof(*retval) +
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(ring_size * sizeof(retval->ring[0]));
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retval = rte_zmalloc_socket(NULL, memsize, 0, socket_id);
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if (retval == NULL)
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goto end;
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snprintf(retval->name, sizeof(retval->name), "EVDEV_RG_%s", name);
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retval->ring_size = ring_size;
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retval->mask = ring_size - 1;
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retval->size = size;
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end:
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return retval;
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}
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static inline void
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qe_ring_destroy(struct qe_ring *r)
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{
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rte_free(r);
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}
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static __rte_always_inline unsigned int
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qe_ring_count(const struct qe_ring *r)
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{
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return r->write_idx - r->read_idx;
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}
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static __rte_always_inline unsigned int
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qe_ring_free_count(const struct qe_ring *r)
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{
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return r->size - qe_ring_count(r);
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}
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static __rte_always_inline unsigned int
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qe_ring_enqueue_burst(struct qe_ring *r, const struct rte_event *qes,
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unsigned int nb_qes, uint16_t *free_count)
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{
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const uint32_t size = r->size;
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const uint32_t mask = r->mask;
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const uint32_t read = r->read_idx;
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uint32_t write = r->write_idx;
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const uint32_t space = read + size - write;
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uint32_t i;
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if (space < nb_qes)
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nb_qes = space;
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for (i = 0; i < nb_qes; i++, write++)
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r->ring[write & mask] = qes[i];
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rte_smp_wmb();
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if (nb_qes != 0)
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r->write_idx = write;
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*free_count = space - nb_qes;
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return nb_qes;
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}
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static __rte_always_inline unsigned int
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qe_ring_enqueue_burst_with_ops(struct qe_ring *r, const struct rte_event *qes,
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unsigned int nb_qes, uint8_t *ops)
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{
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const uint32_t size = r->size;
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const uint32_t mask = r->mask;
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const uint32_t read = r->read_idx;
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uint32_t write = r->write_idx;
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const uint32_t space = read + size - write;
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uint32_t i;
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if (space < nb_qes)
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nb_qes = space;
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for (i = 0; i < nb_qes; i++, write++) {
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r->ring[write & mask] = qes[i];
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r->ring[write & mask].op = ops[i];
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}
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rte_smp_wmb();
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if (nb_qes != 0)
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r->write_idx = write;
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return nb_qes;
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}
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static __rte_always_inline unsigned int
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qe_ring_dequeue_burst(struct qe_ring *r, struct rte_event *qes,
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unsigned int nb_qes)
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{
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const uint32_t mask = r->mask;
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uint32_t read = r->read_idx;
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const uint32_t write = r->write_idx;
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const uint32_t items = write - read;
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uint32_t i;
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if (items < nb_qes)
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nb_qes = items;
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for (i = 0; i < nb_qes; i++, read++)
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qes[i] = r->ring[read & mask];
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rte_smp_rmb();
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if (nb_qes != 0)
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r->read_idx += nb_qes;
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return nb_qes;
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}
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#endif
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