[dpdk-dev] [PATCH v2 37/55] net/sfc: implement event queue support

[Andrew Rybchenko]

Reviewed-by: Andy Moreton <amoreton at solarflare.com>
Signed-off-by: Andrew Rybchenko <arybchenko at solarflare.com>
---
 drivers/net/sfc/Makefile |   1 +
 drivers/net/sfc/sfc.c    |  17 ++
 drivers/net/sfc/sfc.h    |   7 +
 drivers/net/sfc/sfc_ev.c | 482 +++++++++++++++++++++++++++++++++++++++++++++++
 drivers/net/sfc/sfc_ev.h | 139 ++++++++++++++
 5 files changed, 646 insertions(+)
 create mode 100644 drivers/net/sfc/sfc_ev.c
 create mode 100644 drivers/net/sfc/sfc_ev.h

diff --git a/drivers/net/sfc/Makefile b/drivers/net/sfc/Makefile
index d19497c..3286fd8 100644
--- a/drivers/net/sfc/Makefile
+++ b/drivers/net/sfc/Makefile
@@ -83,6 +83,7 @@ SRCS-$(CONFIG_RTE_LIBRTE_SFC_EFX_PMD) += sfc_kvargs.c
 SRCS-$(CONFIG_RTE_LIBRTE_SFC_EFX_PMD) += sfc.c
 SRCS-$(CONFIG_RTE_LIBRTE_SFC_EFX_PMD) += sfc_mcdi.c
 SRCS-$(CONFIG_RTE_LIBRTE_SFC_EFX_PMD) += sfc_intr.c
+SRCS-$(CONFIG_RTE_LIBRTE_SFC_EFX_PMD) += sfc_ev.c
 
 VPATH += $(SRCDIR)/base
 
diff --git a/drivers/net/sfc/sfc.c b/drivers/net/sfc/sfc.c
index d66ea4a..6870efe 100644
--- a/drivers/net/sfc/sfc.c
+++ b/drivers/net/sfc/sfc.c
@@ -36,6 +36,7 @@
 
 #include "sfc.h"
 #include "sfc_log.h"
+#include "sfc_ev.h"
 
 
 int
@@ -261,10 +262,17 @@ sfc_start(struct sfc_adapter *sa)
 	if (rc != 0)
 		goto fail_intr_start;
 
+	rc = sfc_ev_start(sa);
+	if (rc != 0)
+		goto fail_ev_start;
+
 	sa->state = SFC_ADAPTER_STARTED;
 	sfc_log_init(sa, "done");
 	return 0;
 
+fail_ev_start:
+	sfc_intr_stop(sa);
+
 fail_intr_start:
 	efx_nic_fini(sa->nic);
 
@@ -297,6 +305,7 @@ sfc_stop(struct sfc_adapter *sa)
 
 	sa->state = SFC_ADAPTER_STOPPING;
 
+	sfc_ev_stop(sa);
 	sfc_intr_stop(sa);
 	efx_nic_fini(sa->nic);
 
@@ -324,10 +333,17 @@ sfc_configure(struct sfc_adapter *sa)
 	if (rc != 0)
 		goto fail_intr_init;
 
+	rc = sfc_ev_init(sa);
+	if (rc != 0)
+		goto fail_ev_init;
+
 	sa->state = SFC_ADAPTER_CONFIGURED;
 	sfc_log_init(sa, "done");
 	return 0;
 
+fail_ev_init:
+	sfc_intr_fini(sa);
+
 fail_intr_init:
 fail_check_conf:
 	sa->state = SFC_ADAPTER_INITIALIZED;
@@ -345,6 +361,7 @@ sfc_close(struct sfc_adapter *sa)
 	SFC_ASSERT(sa->state == SFC_ADAPTER_CONFIGURED);
 	sa->state = SFC_ADAPTER_CLOSING;
 
+	sfc_ev_fini(sa);
 	sfc_intr_fini(sa);
 
 	sa->state = SFC_ADAPTER_INITIALIZED;
diff --git a/drivers/net/sfc/sfc.h b/drivers/net/sfc/sfc.h
index 102a324..cbad989 100644
--- a/drivers/net/sfc/sfc.h
+++ b/drivers/net/sfc/sfc.h
@@ -113,6 +113,8 @@ struct sfc_intr {
 	efx_intr_type_t			type;
 };
 
+struct sfc_evq_info;
+
 /* Adapter private data */
 struct sfc_adapter {
 	/*
@@ -137,6 +139,11 @@ struct sfc_adapter {
 
 	unsigned int			rxq_max;
 	unsigned int			txq_max;
+
+	unsigned int			evq_count;
+	struct sfc_evq_info		*evq_info;
+
+	unsigned int			mgmt_evq_index;
 };
 
 /*
diff --git a/drivers/net/sfc/sfc_ev.c b/drivers/net/sfc/sfc_ev.c
new file mode 100644
index 0000000..2ee579a
--- /dev/null
+++ b/drivers/net/sfc/sfc_ev.c
@@ -0,0 +1,482 @@
+/*-
+ * Copyright (c) 2016 Solarflare Communications Inc.
+ * All rights reserved.
+ *
+ * This software was jointly developed between OKTET Labs (under contract
+ * for Solarflare) and Solarflare Communications, Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. 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.
+ *
+ * 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_debug.h>
+#include <rte_cycles.h>
+
+#include "efx.h"
+
+#include "sfc.h"
+#include "sfc_debug.h"
+#include "sfc_log.h"
+#include "sfc_ev.h"
+
+
+/* Initial delay when waiting for event queue init complete event */
+#define SFC_EVQ_INIT_BACKOFF_START_US	(1)
+/* Maximum delay between event queue polling attempts */
+#define SFC_EVQ_INIT_BACKOFF_MAX_US	(10 * 1000)
+/* Event queue init approx timeout */
+#define SFC_EVQ_INIT_TIMEOUT_US		(2 * US_PER_S)
+
+
+static boolean_t
+sfc_ev_initialized(void *arg)
+{
+	struct sfc_evq *evq = arg;
+
+	/* Init done events may be duplicated on SFN7xxx (SFC bug 31631) */
+	SFC_ASSERT(evq->init_state == SFC_EVQ_STARTING ||
+		   evq->init_state == SFC_EVQ_STARTED);
+
+	evq->init_state = SFC_EVQ_STARTED;
+
+	return B_FALSE;
+}
+
+static boolean_t
+sfc_ev_rx(void *arg, __rte_unused uint32_t label, __rte_unused uint32_t id,
+	  __rte_unused uint32_t size, __rte_unused uint16_t flags)
+{
+	struct sfc_evq *evq = arg;
+
+	sfc_err(evq->sa, "EVQ %u unexpected Rx event", evq->evq_index);
+	return B_TRUE;
+}
+
+static boolean_t
+sfc_ev_tx(void *arg, __rte_unused uint32_t label, __rte_unused uint32_t id)
+{
+	struct sfc_evq *evq = arg;
+
+	sfc_err(evq->sa, "EVQ %u unexpected Tx event", evq->evq_index);
+	return B_TRUE;
+}
+
+static boolean_t
+sfc_ev_exception(void *arg, __rte_unused uint32_t code,
+		 __rte_unused uint32_t data)
+{
+	struct sfc_evq *evq = arg;
+
+	sfc_err(evq->sa, "EVQ %u unexpected exception event",
+		evq->evq_index);
+	return B_TRUE;
+}
+
+static boolean_t
+sfc_ev_rxq_flush_done(void *arg, __rte_unused uint32_t rxq_hw_index)
+{
+	struct sfc_evq *evq = arg;
+
+	sfc_err(evq->sa, "EVQ %u unexpected Rx flush done event",
+		evq->evq_index);
+	return B_TRUE;
+}
+
+static boolean_t
+sfc_ev_rxq_flush_failed(void *arg, __rte_unused uint32_t rxq_hw_index)
+{
+	struct sfc_evq *evq = arg;
+
+	sfc_err(evq->sa, "EVQ %u unexpected Rx flush failed event",
+		evq->evq_index);
+	return B_TRUE;
+}
+
+static boolean_t
+sfc_ev_txq_flush_done(void *arg, __rte_unused uint32_t txq_hw_index)
+{
+	struct sfc_evq *evq = arg;
+
+	sfc_err(evq->sa, "EVQ %u unexpected Tx flush done event",
+		evq->evq_index);
+	return B_TRUE;
+}
+
+static boolean_t
+sfc_ev_software(void *arg, uint16_t magic)
+{
+	struct sfc_evq *evq = arg;
+
+	sfc_err(evq->sa, "EVQ %u unexpected software event magic=%#.4x",
+		evq->evq_index, magic);
+	return B_TRUE;
+}
+
+static boolean_t
+sfc_ev_sram(void *arg, uint32_t code)
+{
+	struct sfc_evq *evq = arg;
+
+	sfc_err(evq->sa, "EVQ %u unexpected SRAM event code=%u",
+		evq->evq_index, code);
+	return B_TRUE;
+}
+
+static boolean_t
+sfc_ev_wake_up(void *arg, uint32_t index)
+{
+	struct sfc_evq *evq = arg;
+
+	sfc_err(evq->sa, "EVQ %u unexpected wake up event index=%u",
+		evq->evq_index, index);
+	return B_TRUE;
+}
+
+static boolean_t
+sfc_ev_timer(void *arg, uint32_t index)
+{
+	struct sfc_evq *evq = arg;
+
+	sfc_err(evq->sa, "EVQ %u unexpected timer event index=%u",
+		evq->evq_index, index);
+	return B_TRUE;
+}
+
+static boolean_t
+sfc_ev_link_change(void *arg, __rte_unused efx_link_mode_t link_mode)
+{
+	struct sfc_evq *evq = arg;
+
+	sfc_err(evq->sa, "EVQ %u unexpected link change",
+		evq->evq_index);
+	return B_TRUE;
+}
+
+static const efx_ev_callbacks_t sfc_ev_callbacks = {
+	.eec_initialized	= sfc_ev_initialized,
+	.eec_rx			= sfc_ev_rx,
+	.eec_tx			= sfc_ev_tx,
+	.eec_exception		= sfc_ev_exception,
+	.eec_rxq_flush_done	= sfc_ev_rxq_flush_done,
+	.eec_rxq_flush_failed	= sfc_ev_rxq_flush_failed,
+	.eec_txq_flush_done	= sfc_ev_txq_flush_done,
+	.eec_software		= sfc_ev_software,
+	.eec_sram		= sfc_ev_sram,
+	.eec_wake_up		= sfc_ev_wake_up,
+	.eec_timer		= sfc_ev_timer,
+	.eec_link_change	= sfc_ev_link_change,
+};
+
+
+void
+sfc_ev_qpoll(struct sfc_evq *evq)
+{
+	SFC_ASSERT(evq->init_state == SFC_EVQ_STARTED ||
+		   evq->init_state == SFC_EVQ_STARTING);
+
+	/* Synchronize the DMA memory for reading not required */
+
+	efx_ev_qpoll(evq->common, &evq->read_ptr, &sfc_ev_callbacks, evq);
+
+	/* Poll-mode driver does not re-prime the event queue for interrupts */
+}
+
+int
+sfc_ev_qprime(struct sfc_evq *evq)
+{
+	SFC_ASSERT(evq->init_state == SFC_EVQ_STARTED);
+	return efx_ev_qprime(evq->common, evq->read_ptr);
+}
+
+int
+sfc_ev_qstart(struct sfc_adapter *sa, unsigned int sw_index)
+{
+	const struct sfc_evq_info *evq_info;
+	struct sfc_evq *evq;
+	efsys_mem_t *esmp;
+	unsigned int total_delay_us;
+	unsigned int delay_us;
+	int rc;
+
+	sfc_log_init(sa, "sw_index=%u", sw_index);
+
+	evq_info = &sa->evq_info[sw_index];
+	evq = evq_info->evq;
+	esmp = &evq->mem;
+
+	/* Clear all events */
+	(void)memset((void *)esmp->esm_base, 0xff,
+		     EFX_EVQ_SIZE(evq_info->entries));
+
+	/* Create the common code event queue */
+	rc = efx_ev_qcreate(sa->nic, sw_index, esmp, evq_info->entries,
+			    0 /* unused on EF10 */, 0,
+			    EFX_EVQ_FLAGS_TYPE_THROUGHPUT |
+			    EFX_EVQ_FLAGS_NOTIFY_DISABLED,
+			    &evq->common);
+	if (rc != 0)
+		goto fail_ev_qcreate;
+
+	evq->init_state = SFC_EVQ_STARTING;
+
+	/* Wait for the initialization event */
+	total_delay_us = 0;
+	delay_us = SFC_EVQ_INIT_BACKOFF_START_US;
+	do {
+		(void)sfc_ev_qpoll(evq);
+
+		/* Check to see if the initialization complete indication
+		 * posted by the hardware.
+		 */
+		if (evq->init_state == SFC_EVQ_STARTED)
+			goto done;
+
+		/* Give event queue some time to init */
+		rte_delay_us(delay_us);
+
+		total_delay_us += delay_us;
+
+		/* Exponential backoff */
+		delay_us *= 2;
+		if (delay_us > SFC_EVQ_INIT_BACKOFF_MAX_US)
+			delay_us = SFC_EVQ_INIT_BACKOFF_MAX_US;
+
+	} while (total_delay_us < SFC_EVQ_INIT_TIMEOUT_US);
+
+	rc = ETIMEDOUT;
+	goto fail_timedout;
+
+done:
+	return 0;
+
+fail_timedout:
+	evq->init_state = SFC_EVQ_INITIALIZED;
+	efx_ev_qdestroy(evq->common);
+
+fail_ev_qcreate:
+	sfc_log_init(sa, "failed %d", rc);
+	return rc;
+}
+
+void
+sfc_ev_qstop(struct sfc_adapter *sa, unsigned int sw_index)
+{
+	const struct sfc_evq_info *evq_info;
+	struct sfc_evq *evq;
+
+	sfc_log_init(sa, "sw_index=%u", sw_index);
+
+	SFC_ASSERT(sw_index < sa->evq_count);
+
+	evq_info = &sa->evq_info[sw_index];
+	evq = evq_info->evq;
+
+	if (evq == NULL || evq->init_state != SFC_EVQ_STARTED)
+		return;
+
+	evq->init_state = SFC_EVQ_INITIALIZED;
+	evq->read_ptr = 0;
+	evq->exception = B_FALSE;
+
+	efx_ev_qdestroy(evq->common);
+}
+
+int
+sfc_ev_start(struct sfc_adapter *sa)
+{
+	int rc;
+
+	sfc_log_init(sa, "entry");
+
+	rc = efx_ev_init(sa->nic);
+	if (rc != 0)
+		goto fail_ev_init;
+
+	/*
+	 * Rx/Tx event queues are started/stopped when corresponding queue
+	 * is started/stopped.
+	 */
+
+	return 0;
+
+fail_ev_init:
+	sfc_log_init(sa, "failed %d", rc);
+	return rc;
+}
+
+void
+sfc_ev_stop(struct sfc_adapter *sa)
+{
+	unsigned int sw_index;
+
+	sfc_log_init(sa, "entry");
+
+	/* Make sure that all event queues are stopped */
+	sw_index = sa->evq_count;
+	while (sw_index-- > 0)
+		sfc_ev_qstop(sa, sw_index);
+
+	efx_ev_fini(sa->nic);
+}
+
+int
+sfc_ev_qinit(struct sfc_adapter *sa, unsigned int sw_index,
+	     unsigned int entries, int socket_id)
+{
+	struct sfc_evq_info *evq_info;
+	struct sfc_evq *evq;
+	int rc;
+
+	sfc_log_init(sa, "sw_index=%u", sw_index);
+
+	evq_info = &sa->evq_info[sw_index];
+
+	SFC_ASSERT(rte_is_power_of_2(entries));
+	SFC_ASSERT(entries <= evq_info->max_entries);
+	evq_info->entries = entries;
+
+	evq = rte_zmalloc_socket("sfc-evq", sizeof(*evq), RTE_CACHE_LINE_SIZE,
+				 socket_id);
+	if (evq == NULL)
+		return ENOMEM;
+
+	evq->sa = sa;
+	evq->evq_index = sw_index;
+
+	/* Allocate DMA space */
+	rc = sfc_dma_alloc(sa, "evq", sw_index, EFX_EVQ_SIZE(evq_info->entries),
+			   socket_id, &evq->mem);
+	if (rc != 0)
+		return rc;
+
+	evq->init_state = SFC_EVQ_INITIALIZED;
+
+	evq_info->evq = evq;
+
+	return 0;
+}
+
+void
+sfc_ev_qfini(struct sfc_adapter *sa, unsigned int sw_index)
+{
+	struct sfc_evq *evq;
+
+	sfc_log_init(sa, "sw_index=%u", sw_index);
+
+	evq = sa->evq_info[sw_index].evq;
+
+	SFC_ASSERT(evq->init_state == SFC_EVQ_INITIALIZED);
+
+	sa->evq_info[sw_index].evq = NULL;
+
+	sfc_dma_free(sa, &evq->mem);
+
+	rte_free(evq);
+}
+
+static int
+sfc_ev_qinit_info(struct sfc_adapter *sa, unsigned int sw_index)
+{
+	struct sfc_evq_info *evq_info = &sa->evq_info[sw_index];
+	unsigned int max_entries;
+
+	sfc_log_init(sa, "sw_index=%u", sw_index);
+
+	max_entries = sfc_evq_max_entries(sa, sw_index);
+	SFC_ASSERT(rte_is_power_of_2(max_entries));
+
+	evq_info->max_entries = max_entries;
+
+	return 0;
+}
+
+static void
+sfc_ev_qfini_info(struct sfc_adapter *sa, unsigned int sw_index)
+{
+	sfc_log_init(sa, "sw_index=%u", sw_index);
+
+	/* Nothing to cleanup */
+}
+
+int
+sfc_ev_init(struct sfc_adapter *sa)
+{
+	int rc;
+	unsigned int sw_index;
+
+	sfc_log_init(sa, "entry");
+
+	sa->evq_count = sfc_ev_qcount(sa);
+	sa->mgmt_evq_index = 0;
+
+	/* Allocate EVQ info array */
+	rc = ENOMEM;
+	sa->evq_info = rte_calloc_socket("sfc-evqs", sa->evq_count,
+					 sizeof(struct sfc_evq_info), 0,
+					 sa->socket_id);
+	if (sa->evq_info == NULL)
+		goto fail_evqs_alloc;
+
+	for (sw_index = 0; sw_index < sa->evq_count; ++sw_index) {
+		rc = sfc_ev_qinit_info(sa, sw_index);
+		if (rc != 0)
+			goto fail_ev_qinit_info;
+	}
+
+	/*
+	 * Rx/Tx event queues are created/destroyed when corresponding
+	 * Rx/Tx queue is created/destroyed.
+	 */
+
+	return 0;
+
+fail_ev_qinit_info:
+	while (sw_index-- > 0)
+		sfc_ev_qfini_info(sa, sw_index);
+
+	rte_free(sa->evq_info);
+	sa->evq_info = NULL;
+
+fail_evqs_alloc:
+	sa->evq_count = 0;
+	sfc_log_init(sa, "failed %d", rc);
+	return rc;
+}
+
+void
+sfc_ev_fini(struct sfc_adapter *sa)
+{
+	int sw_index;
+
+	sfc_log_init(sa, "entry");
+
+	/* Cleanup all event queues */
+	sw_index = sa->evq_count;
+	while (--sw_index >= 0) {
+		if (sa->evq_info[sw_index].evq != NULL)
+			sfc_ev_qfini(sa, sw_index);
+		sfc_ev_qfini_info(sa, sw_index);
+	}
+
+	rte_free(sa->evq_info);
+	sa->evq_info = NULL;
+	sa->evq_count = 0;
+}
diff --git a/drivers/net/sfc/sfc_ev.h b/drivers/net/sfc/sfc_ev.h
new file mode 100644
index 0000000..11478e9
--- /dev/null
+++ b/drivers/net/sfc/sfc_ev.h
@@ -0,0 +1,139 @@
+/*-
+ * Copyright (c) 2016 Solarflare Communications Inc.
+ * All rights reserved.
+ *
+ * This software was jointly developed between OKTET Labs (under contract
+ * for Solarflare) and Solarflare Communications, Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. 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.
+ *
+ * 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.
+ */
+
+#ifndef _SFC_EV_H_
+#define _SFC_EV_H_
+
+#include "efx.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* Number of entries in the management event queue */
+#define SFC_MGMT_EVQ_ENTRIES	(EFX_EVQ_MINNEVS)
+
+struct sfc_adapter;
+
+enum sfc_evq_state {
+	SFC_EVQ_UNINITIALIZED = 0,
+	SFC_EVQ_INITIALIZED,
+	SFC_EVQ_STARTING,
+	SFC_EVQ_STARTED,
+
+	SFC_EVQ_NSTATES
+};
+
+struct sfc_evq {
+	/* Used on datapath */
+	efx_evq_t		*common;
+	unsigned int		read_ptr;
+	boolean_t		exception;
+	efsys_mem_t		mem;
+
+	/* Not used on datapath */
+	struct sfc_adapter	*sa;
+	unsigned int		evq_index;
+	enum sfc_evq_state	init_state;
+};
+
+struct sfc_evq_info {
+	/* Maximum number of EVQ entries taken into account when buffer
+	 * table space is allocated.
+	 */
+	unsigned int		max_entries;
+	/* Real number of EVQ entries, less or equal to max_entries */
+	unsigned int		entries;
+	/* NUMA-aware EVQ data structure used on datapath */
+	struct sfc_evq		*evq;
+};
+
+/*
+ * Functions below define event queue to transmit/receive queue and vice
+ * versa mapping.
+ */
+
+static inline unsigned int
+sfc_ev_qcount(struct sfc_adapter *sa)
+{
+	const struct rte_eth_dev_data *dev_data = sa->eth_dev->data;
+
+	/*
+	 * One management EVQ for global events.
+	 * Own EVQ for each Tx and Rx queue.
+	 */
+	return 1 + dev_data->nb_rx_queues + dev_data->nb_tx_queues;
+}
+
+static inline unsigned int
+sfc_evq_max_entries(struct sfc_adapter *sa, unsigned int sw_index)
+{
+	unsigned int max_entries;
+
+	if (sw_index == sa->mgmt_evq_index)
+		max_entries = SFC_MGMT_EVQ_ENTRIES;
+	else if (sw_index <= sa->eth_dev->data->nb_rx_queues)
+		max_entries = EFX_RXQ_MAXNDESCS;
+	else
+		max_entries = efx_nic_cfg_get(sa->nic)->enc_txq_max_ndescs;
+
+	return max_entries;
+}
+
+static inline unsigned int
+sfc_evq_index_by_rxq_sw_index(__rte_unused struct sfc_adapter *sa,
+			      unsigned int rxq_sw_index)
+{
+	return 1 + rxq_sw_index;
+}
+
+static inline unsigned int
+sfc_evq_index_by_txq_sw_index(struct sfc_adapter *sa, unsigned int txq_sw_index)
+{
+	return 1 + sa->eth_dev->data->nb_rx_queues + txq_sw_index;
+}
+
+int sfc_ev_init(struct sfc_adapter *sa);
+void sfc_ev_fini(struct sfc_adapter *sa);
+int sfc_ev_start(struct sfc_adapter *sa);
+void sfc_ev_stop(struct sfc_adapter *sa);
+
+int sfc_ev_qinit(struct sfc_adapter *sa, unsigned int sw_index,
+		 unsigned int entries, int socket_id);
+void sfc_ev_qfini(struct sfc_adapter *sa, unsigned int sw_index);
+int sfc_ev_qstart(struct sfc_adapter *sa, unsigned int sw_index);
+void sfc_ev_qstop(struct sfc_adapter *sa, unsigned int sw_index);
+
+int sfc_ev_qprime(struct sfc_evq *evq);
+void sfc_ev_qpoll(struct sfc_evq *evq);
+
+#ifdef __cplusplus
+}
+#endif
+#endif /* _SFC_EV_H_ */
-- 
2.5.5