Imported Upstream version 17.05

Change-Id: Id1e419c5a214e4a18739663b91f0f9a549f1fdc6
Signed-off-by: Christian Ehrhardt <christian.ehrhardt@canonical.com>

1 files changed, 342 insertions, 0 deletions

diff --git a/drivers/net/sfc/sfc_intr.c b/drivers/net/sfc/sfc_intr.c
new file mode 100644
index 00000000..7eb4b86c
--- /dev/null
+++ b/drivers/net/sfc/sfc_intr.c
@@ -0,0 +1,342 @@
+/*-
+ *   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.
+ */
+
+/*
+ * At the momemt of writing DPDK v16.07 has notion of two types of
+ * interrupts: LSC (link status change) and RXQ (receive indication).
+ * It allows to register interrupt callback for entire device which is
+ * not intended to be used for receive indication (i.e. link status
+ * change indication only). The handler has no information which HW
+ * interrupt has triggered it, so we don't know which event queue should
+ * be polled/reprimed (except qmask in the case of legacy line interrupt).
+ */
+
+#include <rte_common.h>
+#include <rte_interrupts.h>
+
+#include "efx.h"
+
+#include "sfc.h"
+#include "sfc_log.h"
+#include "sfc_ev.h"
+
+static void
+sfc_intr_handle_mgmt_evq(struct sfc_adapter *sa)
+{
+	struct sfc_evq *evq;
+
+	rte_spinlock_lock(&sa->mgmt_evq_lock);
+
+	evq = sa->mgmt_evq;
+
+	if (evq->init_state != SFC_EVQ_STARTED) {
+		sfc_log_init(sa, "interrupt on stopped EVQ %u", evq->evq_index);
+	} else {
+		sfc_ev_qpoll(evq);
+
+		if (sfc_ev_qprime(evq) != 0)
+			sfc_err(sa, "cannot prime EVQ %u", evq->evq_index);
+	}
+
+	rte_spinlock_unlock(&sa->mgmt_evq_lock);
+}
+
+static void
+sfc_intr_line_handler(void *cb_arg)
+{
+	struct sfc_adapter *sa = (struct sfc_adapter *)cb_arg;
+	efx_nic_t *enp = sa->nic;
+	boolean_t fatal;
+	uint32_t qmask;
+	unsigned int lsc_seq = sa->port.lsc_seq;
+	struct rte_pci_device *pci_dev = SFC_DEV_TO_PCI(sa->eth_dev);
+
+	sfc_log_init(sa, "entry");
+
+	if (sa->state != SFC_ADAPTER_STARTED &&
+	    sa->state != SFC_ADAPTER_STARTING &&
+	    sa->state != SFC_ADAPTER_STOPPING) {
+		sfc_log_init(sa,
+			     "interrupt on stopped adapter, don't reenable");
+		goto exit;
+	}
+
+	efx_intr_status_line(enp, &fatal, &qmask);
+	if (fatal) {
+		(void)efx_intr_disable(enp);
+		(void)efx_intr_fatal(enp);
+		sfc_err(sa, "fatal, interrupts disabled");
+		goto exit;
+	}
+
+	if (qmask & (1 << sa->mgmt_evq_index))
+		sfc_intr_handle_mgmt_evq(sa);
+
+	if (rte_intr_enable(&pci_dev->intr_handle) != 0)
+		sfc_err(sa, "cannot reenable interrupts");
+
+	sfc_log_init(sa, "done");
+
+exit:
+	if (lsc_seq != sa->port.lsc_seq) {
+		sfc_info(sa, "link status change event: link %s",
+			 sa->eth_dev->data->dev_link.link_status ?
+			 "UP" : "DOWN");
+		_rte_eth_dev_callback_process(sa->eth_dev,
+					      RTE_ETH_EVENT_INTR_LSC, NULL);
+	}
+}
+
+static void
+sfc_intr_message_handler(void *cb_arg)
+{
+	struct sfc_adapter *sa = (struct sfc_adapter *)cb_arg;
+	efx_nic_t *enp = sa->nic;
+	boolean_t fatal;
+	unsigned int lsc_seq = sa->port.lsc_seq;
+	struct rte_pci_device *pci_dev = SFC_DEV_TO_PCI(sa->eth_dev);
+
+	sfc_log_init(sa, "entry");
+
+	if (sa->state != SFC_ADAPTER_STARTED &&
+	    sa->state != SFC_ADAPTER_STARTING &&
+	    sa->state != SFC_ADAPTER_STOPPING) {
+		sfc_log_init(sa, "adapter not-started, don't reenable");
+		goto exit;
+	}
+
+	efx_intr_status_message(enp, sa->mgmt_evq_index, &fatal);
+	if (fatal) {
+		(void)efx_intr_disable(enp);
+		(void)efx_intr_fatal(enp);
+		sfc_err(sa, "fatal, interrupts disabled");
+		goto exit;
+	}
+
+	sfc_intr_handle_mgmt_evq(sa);
+
+	if (rte_intr_enable(&pci_dev->intr_handle) != 0)
+		sfc_err(sa, "cannot reenable interrupts");
+
+	sfc_log_init(sa, "done");
+
+exit:
+	if (lsc_seq != sa->port.lsc_seq) {
+		sfc_info(sa, "link status change event");
+		_rte_eth_dev_callback_process(sa->eth_dev,
+					      RTE_ETH_EVENT_INTR_LSC, NULL);
+	}
+}
+
+int
+sfc_intr_start(struct sfc_adapter *sa)
+{
+	struct sfc_intr *intr = &sa->intr;
+	struct rte_intr_handle *intr_handle;
+	struct rte_pci_device *pci_dev;
+	int rc;
+
+	sfc_log_init(sa, "entry");
+
+	/*
+	 * The EFX common code event queue module depends on the interrupt
+	 * module. Ensure that the interrupt module is always initialized
+	 * (even if interrupts are not used).  Status memory is required
+	 * for Siena only and may be NULL for EF10.
+	 */
+	sfc_log_init(sa, "efx_intr_init");
+	rc = efx_intr_init(sa->nic, intr->type, NULL);
+	if (rc != 0)
+		goto fail_intr_init;
+
+	pci_dev = SFC_DEV_TO_PCI(sa->eth_dev);
+	intr_handle = &pci_dev->intr_handle;
+
+	if (intr->handler != NULL) {
+		sfc_log_init(sa, "rte_intr_callback_register");
+		rc = rte_intr_callback_register(intr_handle, intr->handler,
+						(void *)sa);
+		if (rc != 0) {
+			sfc_err(sa,
+				"cannot register interrupt handler (rc=%d)",
+				rc);
+			/*
+			 * Convert error code from negative returned by RTE API
+			 * to positive used in the driver.
+			 */
+			rc = -rc;
+			goto fail_rte_intr_cb_reg;
+		}
+
+		sfc_log_init(sa, "rte_intr_enable");
+		rc = rte_intr_enable(intr_handle);
+		if (rc != 0) {
+			sfc_err(sa, "cannot enable interrupts (rc=%d)", rc);
+			/*
+			 * Convert error code from negative returned by RTE API
+			 * to positive used in the driver.
+			 */
+			rc = -rc;
+			goto fail_rte_intr_enable;
+		}
+
+		sfc_log_init(sa, "efx_intr_enable");
+		efx_intr_enable(sa->nic);
+	}
+
+	sfc_log_init(sa, "done type=%u max_intr=%d nb_efd=%u vec=%p",
+		     intr_handle->type, intr_handle->max_intr,
+		     intr_handle->nb_efd, intr_handle->intr_vec);
+	return 0;
+
+fail_rte_intr_enable:
+	rte_intr_callback_unregister(intr_handle, intr->handler, (void *)sa);
+
+fail_rte_intr_cb_reg:
+	efx_intr_fini(sa->nic);
+
+fail_intr_init:
+	sfc_log_init(sa, "failed %d", rc);
+	return rc;
+}
+
+void
+sfc_intr_stop(struct sfc_adapter *sa)
+{
+	struct sfc_intr *intr = &sa->intr;
+	struct rte_pci_device *pci_dev = SFC_DEV_TO_PCI(sa->eth_dev);
+
+	sfc_log_init(sa, "entry");
+
+	if (intr->handler != NULL) {
+		struct rte_intr_handle *intr_handle;
+		int rc;
+
+		efx_intr_disable(sa->nic);
+
+		intr_handle = &pci_dev->intr_handle;
+		if (rte_intr_disable(intr_handle) != 0)
+			sfc_err(sa, "cannot disable interrupts");
+
+		while ((rc = rte_intr_callback_unregister(intr_handle,
+				intr->handler, (void *)sa)) == -EAGAIN)
+			;
+		if (rc != 1)
+			sfc_err(sa,
+				"cannot unregister interrupt handler %d",
+				rc);
+	}
+
+	efx_intr_fini(sa->nic);
+
+	sfc_log_init(sa, "done");
+}
+
+int
+sfc_intr_configure(struct sfc_adapter *sa)
+{
+	struct sfc_intr *intr = &sa->intr;
+
+	sfc_log_init(sa, "entry");
+
+	intr->handler = NULL;
+	intr->lsc_intr = (sa->eth_dev->data->dev_conf.intr_conf.lsc != 0);
+	if (!intr->lsc_intr) {
+		sfc_info(sa, "LSC tracking using interrupts is disabled");
+		goto done;
+	}
+
+	switch (intr->type) {
+	case EFX_INTR_MESSAGE:
+		intr->handler = sfc_intr_message_handler;
+		break;
+	case EFX_INTR_LINE:
+		intr->handler = sfc_intr_line_handler;
+		break;
+	case EFX_INTR_INVALID:
+		sfc_warn(sa, "interrupts are not supported");
+		break;
+	default:
+		sfc_panic(sa, "unexpected EFX interrupt type %u\n", intr->type);
+		break;
+	}
+
+done:
+	sfc_log_init(sa, "done");
+	return 0;
+}
+
+void
+sfc_intr_close(struct sfc_adapter *sa)
+{
+	sfc_log_init(sa, "entry");
+
+	sfc_log_init(sa, "done");
+}
+
+int
+sfc_intr_attach(struct sfc_adapter *sa)
+{
+	struct sfc_intr *intr = &sa->intr;
+	struct rte_pci_device *pci_dev = SFC_DEV_TO_PCI(sa->eth_dev);
+
+	sfc_log_init(sa, "entry");
+
+	switch (pci_dev->intr_handle.type) {
+#ifdef RTE_EXEC_ENV_LINUXAPP
+	case RTE_INTR_HANDLE_UIO_INTX:
+	case RTE_INTR_HANDLE_VFIO_LEGACY:
+		intr->type = EFX_INTR_LINE;
+		break;
+	case RTE_INTR_HANDLE_UIO:
+	case RTE_INTR_HANDLE_VFIO_MSI:
+	case RTE_INTR_HANDLE_VFIO_MSIX:
+		intr->type = EFX_INTR_MESSAGE;
+		break;
+#endif
+	default:
+		intr->type = EFX_INTR_INVALID;
+		break;
+	}
+
+	sfc_log_init(sa, "done");
+	return 0;
+}
+
+void
+sfc_intr_detach(struct sfc_adapter *sa)
+{
+	sfc_log_init(sa, "entry");
+
+	sa->intr.type = EFX_INTR_INVALID;
+
+	sfc_log_init(sa, "done");
+}