1 files changed, 921 insertions, 0 deletions

diff --git a/drivers/net/sfc/sfc_ev.c b/drivers/net/sfc/sfc_ev.c
new file mode 100644
index 00000000..160d39f9
--- /dev/null
+++ b/drivers/net/sfc/sfc_ev.c
@@ -0,0 +1,921 @@
+/*-
+ *   BSD LICENSE
+ *
+ * Copyright (c) 2016-2017 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 <rte_alarm.h>
+#include <rte_branch_prediction.h>
+
+#include "efx.h"
+
+#include "sfc.h"
+#include "sfc_debug.h"
+#include "sfc_log.h"
+#include "sfc_ev.h"
+#include "sfc_rx.h"
+#include "sfc_tx.h"
+#include "sfc_kvargs.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)
+
+/* Management event queue polling period in microseconds */
+#define SFC_MGMT_EV_QPOLL_PERIOD_US	(US_PER_S)
+
+static const char *
+sfc_evq_type2str(enum sfc_evq_type type)
+{
+	switch (type) {
+	case SFC_EVQ_TYPE_MGMT:
+		return "mgmt-evq";
+	case SFC_EVQ_TYPE_RX:
+		return "rx-evq";
+	case SFC_EVQ_TYPE_TX:
+		return "tx-evq";
+	default:
+		SFC_ASSERT(B_FALSE);
+		return NULL;
+	}
+}
+
+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_nop_rx(void *arg, uint32_t label, uint32_t id,
+	      uint32_t size, uint16_t flags)
+{
+	struct sfc_evq *evq = arg;
+
+	sfc_err(evq->sa,
+		"EVQ %u unexpected Rx event label=%u id=%#x size=%u flags=%#x",
+		evq->evq_index, label, id, size, flags);
+	return B_TRUE;
+}
+
+static boolean_t
+sfc_ev_efx_rx(void *arg, __rte_unused uint32_t label, uint32_t id,
+	      uint32_t size, uint16_t flags)
+{
+	struct sfc_evq *evq = arg;
+	struct sfc_efx_rxq *rxq;
+	unsigned int stop;
+	unsigned int pending_id;
+	unsigned int delta;
+	unsigned int i;
+	struct sfc_efx_rx_sw_desc *rxd;
+
+	if (unlikely(evq->exception))
+		goto done;
+
+	rxq = sfc_efx_rxq_by_dp_rxq(evq->dp_rxq);
+
+	SFC_ASSERT(rxq != NULL);
+	SFC_ASSERT(rxq->evq == evq);
+	SFC_ASSERT(rxq->flags & SFC_EFX_RXQ_FLAG_STARTED);
+
+	stop = (id + 1) & rxq->ptr_mask;
+	pending_id = rxq->pending & rxq->ptr_mask;
+	delta = (stop >= pending_id) ? (stop - pending_id) :
+		(rxq->ptr_mask + 1 - pending_id + stop);
+
+	if (delta == 0) {
+		/*
+		 * Rx event with no new descriptors done and zero length
+		 * is used to abort scattered packet when there is no room
+		 * for the tail.
+		 */
+		if (unlikely(size != 0)) {
+			evq->exception = B_TRUE;
+			sfc_err(evq->sa,
+				"EVQ %u RxQ %u invalid RX abort "
+				"(id=%#x size=%u flags=%#x); needs restart",
+				evq->evq_index, rxq->dp.dpq.queue_id,
+				id, size, flags);
+			goto done;
+		}
+
+		/* Add discard flag to the first fragment */
+		rxq->sw_desc[pending_id].flags |= EFX_DISCARD;
+		/* Remove continue flag from the last fragment */
+		rxq->sw_desc[id].flags &= ~EFX_PKT_CONT;
+	} else if (unlikely(delta > rxq->batch_max)) {
+		evq->exception = B_TRUE;
+
+		sfc_err(evq->sa,
+			"EVQ %u RxQ %u completion out of order "
+			"(id=%#x delta=%u flags=%#x); needs restart",
+			evq->evq_index, rxq->dp.dpq.queue_id,
+			id, delta, flags);
+
+		goto done;
+	}
+
+	for (i = pending_id; i != stop; i = (i + 1) & rxq->ptr_mask) {
+		rxd = &rxq->sw_desc[i];
+
+		rxd->flags = flags;
+
+		SFC_ASSERT(size < (1 << 16));
+		rxd->size = (uint16_t)size;
+	}
+
+	rxq->pending += delta;
+
+done:
+	return B_FALSE;
+}
+
+static boolean_t
+sfc_ev_dp_rx(void *arg, __rte_unused uint32_t label, uint32_t id,
+	     __rte_unused uint32_t size, __rte_unused uint16_t flags)
+{
+	struct sfc_evq *evq = arg;
+	struct sfc_dp_rxq *dp_rxq;
+
+	dp_rxq = evq->dp_rxq;
+	SFC_ASSERT(dp_rxq != NULL);
+
+	SFC_ASSERT(evq->sa->dp_rx->qrx_ev != NULL);
+	return evq->sa->dp_rx->qrx_ev(dp_rxq, id);
+}
+
+static boolean_t
+sfc_ev_nop_tx(void *arg, uint32_t label, uint32_t id)
+{
+	struct sfc_evq *evq = arg;
+
+	sfc_err(evq->sa, "EVQ %u unexpected Tx event label=%u id=%#x",
+		evq->evq_index, label, id);
+	return B_TRUE;
+}
+
+static boolean_t
+sfc_ev_tx(void *arg, __rte_unused uint32_t label, uint32_t id)
+{
+	struct sfc_evq *evq = arg;
+	struct sfc_dp_txq *dp_txq;
+	struct sfc_efx_txq *txq;
+	unsigned int stop;
+	unsigned int delta;
+
+	dp_txq = evq->dp_txq;
+	SFC_ASSERT(dp_txq != NULL);
+
+	txq = sfc_efx_txq_by_dp_txq(dp_txq);
+	SFC_ASSERT(txq->evq == evq);
+
+	if (unlikely((txq->flags & SFC_EFX_TXQ_FLAG_STARTED) == 0))
+		goto done;
+
+	stop = (id + 1) & txq->ptr_mask;
+	id = txq->pending & txq->ptr_mask;
+
+	delta = (stop >= id) ? (stop - id) : (txq->ptr_mask + 1 - id + stop);
+
+	txq->pending += delta;
+
+done:
+	return B_FALSE;
+}
+
+static boolean_t
+sfc_ev_dp_tx(void *arg, __rte_unused uint32_t label, uint32_t id)
+{
+	struct sfc_evq *evq = arg;
+	struct sfc_dp_txq *dp_txq;
+
+	dp_txq = evq->dp_txq;
+	SFC_ASSERT(dp_txq != NULL);
+
+	SFC_ASSERT(evq->sa->dp_tx->qtx_ev != NULL);
+	return evq->sa->dp_tx->qtx_ev(dp_txq, id);
+}
+
+static boolean_t
+sfc_ev_exception(void *arg, __rte_unused uint32_t code,
+		 __rte_unused uint32_t data)
+{
+	struct sfc_evq *evq = arg;
+
+	if (code == EFX_EXCEPTION_UNKNOWN_SENSOREVT)
+		return B_FALSE;
+
+	evq->exception = B_TRUE;
+	sfc_warn(evq->sa,
+		 "hardware exception %s (code=%u, data=%#x) on EVQ %u;"
+		 " needs recovery",
+		 (code == EFX_EXCEPTION_RX_RECOVERY) ? "RX_RECOVERY" :
+		 (code == EFX_EXCEPTION_RX_DSC_ERROR) ? "RX_DSC_ERROR" :
+		 (code == EFX_EXCEPTION_TX_DSC_ERROR) ? "TX_DSC_ERROR" :
+		 (code == EFX_EXCEPTION_FWALERT_SRAM) ? "FWALERT_SRAM" :
+		 (code == EFX_EXCEPTION_UNKNOWN_FWALERT) ? "UNKNOWN_FWALERT" :
+		 (code == EFX_EXCEPTION_RX_ERROR) ? "RX_ERROR" :
+		 (code == EFX_EXCEPTION_TX_ERROR) ? "TX_ERROR" :
+		 (code == EFX_EXCEPTION_EV_ERROR) ? "EV_ERROR" :
+		 "UNKNOWN",
+		 code, data, evq->evq_index);
+
+	return B_TRUE;
+}
+
+static boolean_t
+sfc_ev_nop_rxq_flush_done(void *arg, uint32_t rxq_hw_index)
+{
+	struct sfc_evq *evq = arg;
+
+	sfc_err(evq->sa, "EVQ %u unexpected RxQ %u flush done",
+		evq->evq_index, rxq_hw_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;
+	struct sfc_dp_rxq *dp_rxq;
+	struct sfc_rxq *rxq;
+
+	dp_rxq = evq->dp_rxq;
+	SFC_ASSERT(dp_rxq != NULL);
+
+	rxq = sfc_rxq_by_dp_rxq(dp_rxq);
+	SFC_ASSERT(rxq != NULL);
+	SFC_ASSERT(rxq->hw_index == rxq_hw_index);
+	SFC_ASSERT(rxq->evq == evq);
+	sfc_rx_qflush_done(rxq);
+
+	return B_FALSE;
+}
+
+static boolean_t
+sfc_ev_nop_rxq_flush_failed(void *arg, uint32_t rxq_hw_index)
+{
+	struct sfc_evq *evq = arg;
+
+	sfc_err(evq->sa, "EVQ %u unexpected RxQ %u flush failed",
+		evq->evq_index, rxq_hw_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;
+	struct sfc_dp_rxq *dp_rxq;
+	struct sfc_rxq *rxq;
+
+	dp_rxq = evq->dp_rxq;
+	SFC_ASSERT(dp_rxq != NULL);
+
+	rxq = sfc_rxq_by_dp_rxq(dp_rxq);
+	SFC_ASSERT(rxq != NULL);
+	SFC_ASSERT(rxq->hw_index == rxq_hw_index);
+	SFC_ASSERT(rxq->evq == evq);
+	sfc_rx_qflush_failed(rxq);
+
+	return B_FALSE;
+}
+
+static boolean_t
+sfc_ev_nop_txq_flush_done(void *arg, uint32_t txq_hw_index)
+{
+	struct sfc_evq *evq = arg;
+
+	sfc_err(evq->sa, "EVQ %u unexpected TxQ %u flush done",
+		evq->evq_index, txq_hw_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;
+	struct sfc_dp_txq *dp_txq;
+	struct sfc_txq *txq;
+
+	dp_txq = evq->dp_txq;
+	SFC_ASSERT(dp_txq != NULL);
+
+	txq = sfc_txq_by_dp_txq(dp_txq);
+	SFC_ASSERT(txq != NULL);
+	SFC_ASSERT(txq->hw_index == txq_hw_index);
+	SFC_ASSERT(txq->evq == evq);
+	sfc_tx_qflush_done(txq);
+
+	return B_FALSE;
+}
+
+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_nop_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 event",
+		evq->evq_index);
+	return B_TRUE;
+}
+
+static boolean_t
+sfc_ev_link_change(void *arg, efx_link_mode_t link_mode)
+{
+	struct sfc_evq *evq = arg;
+	struct sfc_adapter *sa = evq->sa;
+	struct rte_eth_link *dev_link = &sa->eth_dev->data->dev_link;
+	struct rte_eth_link new_link;
+	uint64_t new_link_u64;
+	uint64_t old_link_u64;
+
+	EFX_STATIC_ASSERT(sizeof(*dev_link) == sizeof(rte_atomic64_t));
+
+	sfc_port_link_mode_to_info(link_mode, &new_link);
+
+	new_link_u64 = *(uint64_t *)&new_link;
+	do {
+		old_link_u64 = rte_atomic64_read((rte_atomic64_t *)dev_link);
+		if (old_link_u64 == new_link_u64)
+			break;
+
+		if (rte_atomic64_cmpset((volatile uint64_t *)dev_link,
+					old_link_u64, new_link_u64)) {
+			evq->sa->port.lsc_seq++;
+			break;
+		}
+	} while (B_TRUE);
+
+	return B_FALSE;
+}
+
+static const efx_ev_callbacks_t sfc_ev_callbacks = {
+	.eec_initialized	= sfc_ev_initialized,
+	.eec_rx			= sfc_ev_nop_rx,
+	.eec_tx			= sfc_ev_nop_tx,
+	.eec_exception		= sfc_ev_exception,
+	.eec_rxq_flush_done	= sfc_ev_nop_rxq_flush_done,
+	.eec_rxq_flush_failed	= sfc_ev_nop_rxq_flush_failed,
+	.eec_txq_flush_done	= sfc_ev_nop_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,
+};
+
+static const efx_ev_callbacks_t sfc_ev_callbacks_efx_rx = {
+	.eec_initialized	= sfc_ev_initialized,
+	.eec_rx			= sfc_ev_efx_rx,
+	.eec_tx			= sfc_ev_nop_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_nop_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_nop_link_change,
+};
+
+static const efx_ev_callbacks_t sfc_ev_callbacks_dp_rx = {
+	.eec_initialized	= sfc_ev_initialized,
+	.eec_rx			= sfc_ev_dp_rx,
+	.eec_tx			= sfc_ev_nop_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_nop_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_nop_link_change,
+};
+
+static const efx_ev_callbacks_t sfc_ev_callbacks_efx_tx = {
+	.eec_initialized	= sfc_ev_initialized,
+	.eec_rx			= sfc_ev_nop_rx,
+	.eec_tx			= sfc_ev_tx,
+	.eec_exception		= sfc_ev_exception,
+	.eec_rxq_flush_done	= sfc_ev_nop_rxq_flush_done,
+	.eec_rxq_flush_failed	= sfc_ev_nop_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_nop_link_change,
+};
+
+static const efx_ev_callbacks_t sfc_ev_callbacks_dp_tx = {
+	.eec_initialized	= sfc_ev_initialized,
+	.eec_rx			= sfc_ev_nop_rx,
+	.eec_tx			= sfc_ev_dp_tx,
+	.eec_exception		= sfc_ev_exception,
+	.eec_rxq_flush_done	= sfc_ev_nop_rxq_flush_done,
+	.eec_rxq_flush_failed	= sfc_ev_nop_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_nop_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, evq->callbacks, evq);
+
+	if (unlikely(evq->exception) && sfc_adapter_trylock(evq->sa)) {
+		struct sfc_adapter *sa = evq->sa;
+		int rc;
+
+		if (evq->dp_rxq != NULL) {
+			unsigned int rxq_sw_index;
+
+			rxq_sw_index = evq->dp_rxq->dpq.queue_id;
+
+			sfc_warn(sa,
+				 "restart RxQ %u because of exception on its EvQ %u",
+				 rxq_sw_index, evq->evq_index);
+
+			sfc_rx_qstop(sa, rxq_sw_index);
+			rc = sfc_rx_qstart(sa, rxq_sw_index);
+			if (rc != 0)
+				sfc_err(sa, "cannot restart RxQ %u",
+					rxq_sw_index);
+		}
+
+		if (evq->dp_txq != NULL) {
+			unsigned int txq_sw_index;
+
+			txq_sw_index = evq->dp_txq->dpq.queue_id;
+
+			sfc_warn(sa,
+				 "restart TxQ %u because of exception on its EvQ %u",
+				 txq_sw_index, evq->evq_index);
+
+			sfc_tx_qstop(sa, txq_sw_index);
+			rc = sfc_tx_qstart(sa, txq_sw_index);
+			if (rc != 0)
+				sfc_err(sa, "cannot restart TxQ %u",
+					txq_sw_index);
+		}
+
+		if (evq->exception)
+			sfc_panic(sa, "unrecoverable exception on EvQ %u",
+				  evq->evq_index);
+
+		sfc_adapter_unlock(sa);
+	}
+
+	/* Poll-mode driver does not re-prime the event queue for interrupts */
+}
+
+void
+sfc_ev_mgmt_qpoll(struct sfc_adapter *sa)
+{
+	if (rte_spinlock_trylock(&sa->mgmt_evq_lock)) {
+		struct sfc_evq *mgmt_evq = sa->mgmt_evq;
+
+		if (mgmt_evq->init_state == SFC_EVQ_STARTED)
+			sfc_ev_qpoll(mgmt_evq);
+
+		rte_spinlock_unlock(&sa->mgmt_evq_lock);
+	}
+}
+
+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);
+}
+
+/* Event queue HW index allocation scheme is described in sfc_ev.h. */
+int
+sfc_ev_qstart(struct sfc_evq *evq, unsigned int hw_index)
+{
+	struct sfc_adapter *sa = evq->sa;
+	efsys_mem_t *esmp;
+	uint32_t evq_flags = sa->evq_flags;
+	unsigned int total_delay_us;
+	unsigned int delay_us;
+	int rc;
+
+	sfc_log_init(sa, "hw_index=%u", hw_index);
+
+	esmp = &evq->mem;
+
+	evq->evq_index = hw_index;
+
+	/* Clear all events */
+	(void)memset((void *)esmp->esm_base, 0xff, EFX_EVQ_SIZE(evq->entries));
+
+	if (sa->intr.lsc_intr && hw_index == sa->mgmt_evq_index)
+		evq_flags |= EFX_EVQ_FLAGS_NOTIFY_INTERRUPT;
+	else
+		evq_flags |= EFX_EVQ_FLAGS_NOTIFY_DISABLED;
+
+	/* Create the common code event queue */
+	rc = efx_ev_qcreate(sa->nic, hw_index, esmp, evq->entries,
+			    0 /* unused on EF10 */, 0, evq_flags,
+			    &evq->common);
+	if (rc != 0)
+		goto fail_ev_qcreate;
+
+	SFC_ASSERT(evq->dp_rxq == NULL || evq->dp_txq == NULL);
+	if (evq->dp_rxq != 0) {
+		if (strcmp(sa->dp_rx->dp.name, SFC_KVARG_DATAPATH_EFX) == 0)
+			evq->callbacks = &sfc_ev_callbacks_efx_rx;
+		else
+			evq->callbacks = &sfc_ev_callbacks_dp_rx;
+	} else if (evq->dp_txq != 0) {
+		if (strcmp(sa->dp_tx->dp.name, SFC_KVARG_DATAPATH_EFX) == 0)
+			evq->callbacks = &sfc_ev_callbacks_efx_tx;
+		else
+			evq->callbacks = &sfc_ev_callbacks_dp_tx;
+	} else {
+		evq->callbacks = &sfc_ev_callbacks;
+	}
+
+	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_evq *evq)
+{
+	if (evq == NULL)
+		return;
+
+	sfc_log_init(evq->sa, "hw_index=%u", evq->evq_index);
+
+	if (evq->init_state != SFC_EVQ_STARTED)
+		return;
+
+	evq->init_state = SFC_EVQ_INITIALIZED;
+	evq->callbacks = NULL;
+	evq->read_ptr = 0;
+	evq->exception = B_FALSE;
+
+	efx_ev_qdestroy(evq->common);
+
+	evq->evq_index = 0;
+}
+
+static void
+sfc_ev_mgmt_periodic_qpoll(void *arg)
+{
+	struct sfc_adapter *sa = arg;
+	int rc;
+
+	sfc_ev_mgmt_qpoll(sa);
+
+	rc = rte_eal_alarm_set(SFC_MGMT_EV_QPOLL_PERIOD_US,
+			       sfc_ev_mgmt_periodic_qpoll, sa);
+	if (rc == -ENOTSUP) {
+		sfc_warn(sa, "alarms are not supported");
+		sfc_warn(sa, "management EVQ must be polled indirectly using no-wait link status update");
+	} else if (rc != 0) {
+		sfc_err(sa,
+			"cannot rearm management EVQ polling alarm (rc=%d)",
+			rc);
+	}
+}
+
+static void
+sfc_ev_mgmt_periodic_qpoll_start(struct sfc_adapter *sa)
+{
+	sfc_ev_mgmt_periodic_qpoll(sa);
+}
+
+static void
+sfc_ev_mgmt_periodic_qpoll_stop(struct sfc_adapter *sa)
+{
+	rte_eal_alarm_cancel(sfc_ev_mgmt_periodic_qpoll, sa);
+}
+
+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;
+
+	/* Start management EVQ used for global events */
+	rte_spinlock_lock(&sa->mgmt_evq_lock);
+
+	rc = sfc_ev_qstart(sa->mgmt_evq, sa->mgmt_evq_index);
+	if (rc != 0)
+		goto fail_mgmt_evq_start;
+
+	if (sa->intr.lsc_intr) {
+		rc = sfc_ev_qprime(sa->mgmt_evq);
+		if (rc != 0)
+			goto fail_evq0_prime;
+	}
+
+	rte_spinlock_unlock(&sa->mgmt_evq_lock);
+
+	/*
+	 * Start management EVQ polling. If interrupts are disabled
+	 * (not used), it is required to process link status change
+	 * and other device level events to avoid unrecoverable
+	 * error because the event queue overflow.
+	 */
+	sfc_ev_mgmt_periodic_qpoll_start(sa);
+
+	/*
+	 * Rx/Tx event queues are started/stopped when corresponding
+	 * Rx/Tx queue is started/stopped.
+	 */
+
+	return 0;
+
+fail_evq0_prime:
+	sfc_ev_qstop(sa->mgmt_evq);
+
+fail_mgmt_evq_start:
+	rte_spinlock_unlock(&sa->mgmt_evq_lock);
+	efx_ev_fini(sa->nic);
+
+fail_ev_init:
+	sfc_log_init(sa, "failed %d", rc);
+	return rc;
+}
+
+void
+sfc_ev_stop(struct sfc_adapter *sa)
+{
+	sfc_log_init(sa, "entry");
+
+	sfc_ev_mgmt_periodic_qpoll_stop(sa);
+
+	rte_spinlock_lock(&sa->mgmt_evq_lock);
+	sfc_ev_qstop(sa->mgmt_evq);
+	rte_spinlock_unlock(&sa->mgmt_evq_lock);
+
+	efx_ev_fini(sa->nic);
+}
+
+int
+sfc_ev_qinit(struct sfc_adapter *sa,
+	     enum sfc_evq_type type, unsigned int type_index,
+	     unsigned int entries, int socket_id, struct sfc_evq **evqp)
+{
+	struct sfc_evq *evq;
+	int rc;
+
+	sfc_log_init(sa, "type=%s type_index=%u",
+		     sfc_evq_type2str(type), type_index);
+
+	SFC_ASSERT(rte_is_power_of_2(entries));
+
+	rc = ENOMEM;
+	evq = rte_zmalloc_socket("sfc-evq", sizeof(*evq), RTE_CACHE_LINE_SIZE,
+				 socket_id);
+	if (evq == NULL)
+		goto fail_evq_alloc;
+
+	evq->sa = sa;
+	evq->type = type;
+	evq->entries = entries;
+
+	/* Allocate DMA space */
+	rc = sfc_dma_alloc(sa, sfc_evq_type2str(type), type_index,
+			   EFX_EVQ_SIZE(evq->entries), socket_id, &evq->mem);
+	if (rc != 0)
+		goto fail_dma_alloc;
+
+	evq->init_state = SFC_EVQ_INITIALIZED;
+
+	sa->evq_count++;
+
+	*evqp = evq;
+
+	return 0;
+
+fail_dma_alloc:
+	rte_free(evq);
+
+fail_evq_alloc:
+
+	sfc_log_init(sa, "failed %d", rc);
+	return rc;
+}
+
+void
+sfc_ev_qfini(struct sfc_evq *evq)
+{
+	struct sfc_adapter *sa = evq->sa;
+
+	SFC_ASSERT(evq->init_state == SFC_EVQ_INITIALIZED);
+
+	sfc_dma_free(sa, &evq->mem);
+
+	rte_free(evq);
+
+	SFC_ASSERT(sa->evq_count > 0);
+	sa->evq_count--;
+}
+
+static int
+sfc_kvarg_perf_profile_handler(__rte_unused const char *key,
+			       const char *value_str, void *opaque)
+{
+	uint64_t *value = opaque;
+
+	if (strcasecmp(value_str, SFC_KVARG_PERF_PROFILE_THROUGHPUT) == 0)
+		*value = EFX_EVQ_FLAGS_TYPE_THROUGHPUT;
+	else if (strcasecmp(value_str, SFC_KVARG_PERF_PROFILE_LOW_LATENCY) == 0)
+		*value = EFX_EVQ_FLAGS_TYPE_LOW_LATENCY;
+	else if (strcasecmp(value_str, SFC_KVARG_PERF_PROFILE_AUTO) == 0)
+		*value = EFX_EVQ_FLAGS_TYPE_AUTO;
+	else
+		return -EINVAL;
+
+	return 0;
+}
+
+int
+sfc_ev_attach(struct sfc_adapter *sa)
+{
+	int rc;
+
+	sfc_log_init(sa, "entry");
+
+	sa->evq_flags = EFX_EVQ_FLAGS_TYPE_THROUGHPUT;
+	rc = sfc_kvargs_process(sa, SFC_KVARG_PERF_PROFILE,
+				sfc_kvarg_perf_profile_handler,
+				&sa->evq_flags);
+	if (rc != 0) {
+		sfc_err(sa, "invalid %s parameter value",
+			SFC_KVARG_PERF_PROFILE);
+		goto fail_kvarg_perf_profile;
+	}
+
+	sa->mgmt_evq_index = 0;
+	rte_spinlock_init(&sa->mgmt_evq_lock);
+
+	rc = sfc_ev_qinit(sa, SFC_EVQ_TYPE_MGMT, 0, SFC_MGMT_EVQ_ENTRIES,
+			  sa->socket_id, &sa->mgmt_evq);
+	if (rc != 0)
+		goto fail_mgmt_evq_init;
+
+	/*
+	 * Rx/Tx event queues are created/destroyed when corresponding
+	 * Rx/Tx queue is created/destroyed.
+	 */
+
+	return 0;
+
+fail_mgmt_evq_init:
+
+fail_kvarg_perf_profile:
+	sfc_log_init(sa, "failed %d", rc);
+	return rc;
+}
+
+void
+sfc_ev_detach(struct sfc_adapter *sa)
+{
+	sfc_log_init(sa, "entry");
+
+	sfc_ev_qfini(sa->mgmt_evq);
+
+	if (sa->evq_count != 0)
+		sfc_err(sa, "%u EvQs are not destroyed before detach",
+			sa->evq_count);
+}