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-rw-r--r--src/spdk/dpdk/drivers/event/sw/event_ring.h153
1 files changed, 153 insertions, 0 deletions
diff --git a/src/spdk/dpdk/drivers/event/sw/event_ring.h b/src/spdk/dpdk/drivers/event/sw/event_ring.h
new file mode 100644
index 00000000..02308728
--- /dev/null
+++ b/src/spdk/dpdk/drivers/event/sw/event_ring.h
@@ -0,0 +1,153 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2016-2017 Intel Corporation
+ */
+
+/*
+ * Generic ring structure for passing events from one core to another.
+ *
+ * Used by the software scheduler for the producer and consumer rings for
+ * each port, i.e. for passing events from worker cores to scheduler and
+ * vice-versa. Designed for single-producer, single-consumer use with two
+ * cores working on each ring.
+ */
+
+#ifndef _EVENT_RING_
+#define _EVENT_RING_
+
+#include <stdint.h>
+
+#include <rte_common.h>
+#include <rte_memory.h>
+#include <rte_malloc.h>
+
+#define QE_RING_NAMESIZE 32
+
+struct qe_ring {
+ char name[QE_RING_NAMESIZE] __rte_cache_aligned;
+ uint32_t ring_size; /* size of memory block allocated to the ring */
+ uint32_t mask; /* mask for read/write values == ring_size -1 */
+ uint32_t size; /* actual usable space in the ring */
+ volatile uint32_t write_idx __rte_cache_aligned;
+ volatile uint32_t read_idx __rte_cache_aligned;
+
+ struct rte_event ring[0] __rte_cache_aligned;
+};
+
+static inline struct qe_ring *
+qe_ring_create(const char *name, unsigned int size, unsigned int socket_id)
+{
+ struct qe_ring *retval;
+ const uint32_t ring_size = rte_align32pow2(size + 1);
+ size_t memsize = sizeof(*retval) +
+ (ring_size * sizeof(retval->ring[0]));
+
+ retval = rte_zmalloc_socket(NULL, memsize, 0, socket_id);
+ if (retval == NULL)
+ goto end;
+
+ snprintf(retval->name, sizeof(retval->name), "EVDEV_RG_%s", name);
+ retval->ring_size = ring_size;
+ retval->mask = ring_size - 1;
+ retval->size = size;
+end:
+ return retval;
+}
+
+static inline void
+qe_ring_destroy(struct qe_ring *r)
+{
+ rte_free(r);
+}
+
+static __rte_always_inline unsigned int
+qe_ring_count(const struct qe_ring *r)
+{
+ return r->write_idx - r->read_idx;
+}
+
+static __rte_always_inline unsigned int
+qe_ring_free_count(const struct qe_ring *r)
+{
+ return r->size - qe_ring_count(r);
+}
+
+static __rte_always_inline unsigned int
+qe_ring_enqueue_burst(struct qe_ring *r, const struct rte_event *qes,
+ unsigned int nb_qes, uint16_t *free_count)
+{
+ const uint32_t size = r->size;
+ const uint32_t mask = r->mask;
+ const uint32_t read = r->read_idx;
+ uint32_t write = r->write_idx;
+ const uint32_t space = read + size - write;
+ uint32_t i;
+
+ if (space < nb_qes)
+ nb_qes = space;
+
+ for (i = 0; i < nb_qes; i++, write++)
+ r->ring[write & mask] = qes[i];
+
+ rte_smp_wmb();
+
+ if (nb_qes != 0)
+ r->write_idx = write;
+
+ *free_count = space - nb_qes;
+
+ return nb_qes;
+}
+
+static __rte_always_inline unsigned int
+qe_ring_enqueue_burst_with_ops(struct qe_ring *r, const struct rte_event *qes,
+ unsigned int nb_qes, uint8_t *ops)
+{
+ const uint32_t size = r->size;
+ const uint32_t mask = r->mask;
+ const uint32_t read = r->read_idx;
+ uint32_t write = r->write_idx;
+ const uint32_t space = read + size - write;
+ uint32_t i;
+
+ if (space < nb_qes)
+ nb_qes = space;
+
+ for (i = 0; i < nb_qes; i++, write++) {
+ r->ring[write & mask] = qes[i];
+ r->ring[write & mask].op = ops[i];
+ }
+
+ rte_smp_wmb();
+
+ if (nb_qes != 0)
+ r->write_idx = write;
+
+ return nb_qes;
+}
+
+static __rte_always_inline unsigned int
+qe_ring_dequeue_burst(struct qe_ring *r, struct rte_event *qes,
+ unsigned int nb_qes)
+{
+ const uint32_t mask = r->mask;
+ uint32_t read = r->read_idx;
+ const uint32_t write = r->write_idx;
+ const uint32_t items = write - read;
+ uint32_t i;
+
+ if (items < nb_qes)
+ nb_qes = items;
+
+
+ for (i = 0; i < nb_qes; i++, read++)
+ qes[i] = r->ring[read & mask];
+
+ rte_smp_rmb();
+
+ if (nb_qes != 0)
+ r->read_idx += nb_qes;
+
+ return nb_qes;
+}
+
+#endif