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Diffstat (limited to 'drivers/net/tap/tap_intr.c')
-rw-r--r--drivers/net/tap/tap_intr.c110
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;
+}