New upstream version 18.02upstream/18.02

Change-Id: I89ed24cb2a49b78fe5be6970b99dd46c1499fcc3
Signed-off-by: Luca Boccassi <luca.boccassi@gmail.com>

1 files changed, 110 insertions, 0 deletions

diff --git a/drivers/net/tap/tap_intr.c b/drivers/net/tap/tap_intr.c
new file mode 100644
index 00000000..b0e19914
--- /dev/null
+++ b/drivers/net/tap/tap_intr.c
@@ -0,0 +1,110 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright 2018 Mellanox Technologies, Ltd.
+ */
+
+/**
+ * @file
+ * Interrupts handling for tap driver.
+ */
+
+#include <assert.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <signal.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include <rte_eth_tap.h>
+#include <rte_errno.h>
+#include <rte_interrupts.h>
+
+
+/**
+ * Unregister Rx interrupts free the queue interrupt vector.
+ *
+ * @param dev
+ *   Pointer to the tap rte_eth_dev structure.
+ */
+static void
+tap_rx_intr_vec_uninstall(struct rte_eth_dev *dev)
+{
+	struct pmd_internals *pmd = dev->data->dev_private;
+	struct rte_intr_handle *intr_handle = &pmd->intr_handle;
+
+	rte_intr_free_epoll_fd(intr_handle);
+	free(intr_handle->intr_vec);
+	intr_handle->intr_vec = NULL;
+	intr_handle->nb_efd = 0;
+}
+
+/**
+ * Allocate Rx queue interrupt vector and register Rx interrupts.
+ *
+ * @param dev
+ *   Pointer to the tap rte_eth_dev device structure.
+ *
+ * @return
+ *   0 on success, negative errno value otherwise and rte_errno is set.
+ */
+static int
+tap_rx_intr_vec_install(struct rte_eth_dev *dev)
+{
+	struct pmd_internals *pmd = dev->data->dev_private;
+	unsigned int rxqs_n = pmd->dev->data->nb_rx_queues;
+	struct rte_intr_handle *intr_handle = &pmd->intr_handle;
+	unsigned int n = RTE_MIN(rxqs_n, (uint32_t)RTE_MAX_RXTX_INTR_VEC_ID);
+	unsigned int i;
+	unsigned int count = 0;
+
+	if (!dev->data->dev_conf.intr_conf.rxq)
+		return 0;
+	intr_handle->intr_vec = malloc(sizeof(intr_handle->intr_vec[rxqs_n]));
+	if (intr_handle->intr_vec == NULL) {
+		rte_errno = ENOMEM;
+		RTE_LOG(ERR, PMD,
+			"failed to allocate memory for interrupt vector,"
+			" Rx interrupts will not be supported");
+		return -rte_errno;
+	}
+	for (i = 0; i < n; i++) {
+		struct rx_queue *rxq = pmd->dev->data->rx_queues[i];
+
+		/* Skip queues that cannot request interrupts. */
+		if (!rxq || rxq->fd <= 0) {
+			/* Use invalid intr_vec[] index to disable entry. */
+			intr_handle->intr_vec[i] =
+				RTE_INTR_VEC_RXTX_OFFSET +
+				RTE_MAX_RXTX_INTR_VEC_ID;
+			continue;
+		}
+		intr_handle->intr_vec[i] = RTE_INTR_VEC_RXTX_OFFSET + count;
+		intr_handle->efds[count] = rxq->fd;
+		count++;
+	}
+	if (!count)
+		tap_rx_intr_vec_uninstall(dev);
+	else
+		intr_handle->nb_efd = count;
+	return 0;
+}
+
+/**
+ * Register or unregister the Rx interrupts.
+ *
+ * @param dev
+ *   Pointer to the tap rte_eth_dev device structure.
+ * @param set
+ *   should the operation be register or unregister the interrupts.
+ *
+ * @return
+ *   0 on success, negative errno value otherwise and rte_errno is set.
+ */
+int
+tap_rx_intr_vec_set(struct rte_eth_dev *dev, int set)
+{
+	tap_rx_intr_vec_uninstall(dev);
+	if (set)
+		return tap_rx_intr_vec_install(dev);
+	return 0;
+}