1 /* SPDX-License-Identifier: BSD-3-Clause
2 * Copyright 2018 Mellanox Technologies, Ltd
7 * Interrupts handling for tap driver.
17 #include <rte_eth_tap.h>
18 #include <rte_errno.h>
19 #include <rte_interrupts.h>
23 * Unregister Rx interrupts free the queue interrupt vector.
26 * Pointer to the tap rte_eth_dev structure.
29 tap_rx_intr_vec_uninstall(struct rte_eth_dev *dev)
31 struct pmd_internals *pmd = dev->data->dev_private;
32 struct rte_intr_handle *intr_handle = pmd->intr_handle;
34 rte_intr_free_epoll_fd(intr_handle);
35 rte_intr_vec_list_free(intr_handle);
36 rte_intr_nb_efd_set(intr_handle, 0);
38 rte_intr_instance_free(intr_handle);
42 * Allocate Rx queue interrupt vector and register Rx interrupts.
45 * Pointer to the tap rte_eth_dev device structure.
48 * 0 on success, negative errno value otherwise and rte_errno is set.
51 tap_rx_intr_vec_install(struct rte_eth_dev *dev)
53 struct pmd_internals *pmd = dev->data->dev_private;
54 struct pmd_process_private *process_private = dev->process_private;
55 unsigned int rxqs_n = pmd->dev->data->nb_rx_queues;
56 struct rte_intr_handle *intr_handle = pmd->intr_handle;
57 unsigned int n = RTE_MIN(rxqs_n, (uint32_t)RTE_MAX_RXTX_INTR_VEC_ID);
59 unsigned int count = 0;
61 if (!dev->data->dev_conf.intr_conf.rxq)
64 if (rte_intr_vec_list_alloc(intr_handle, NULL, rxqs_n)) {
67 "failed to allocate memory for interrupt vector,"
68 " Rx interrupts will not be supported");
71 for (i = 0; i < n; i++) {
72 struct rx_queue *rxq = pmd->dev->data->rx_queues[i];
74 /* Skip queues that cannot request interrupts. */
75 if (!rxq || process_private->rxq_fds[i] == -1) {
76 /* Use invalid intr_vec[] index to disable entry. */
77 if (rte_intr_vec_list_index_set(intr_handle, i,
78 RTE_INTR_VEC_RXTX_OFFSET + RTE_MAX_RXTX_INTR_VEC_ID))
82 if (rte_intr_vec_list_index_set(intr_handle, i,
83 RTE_INTR_VEC_RXTX_OFFSET + count))
85 if (rte_intr_efds_index_set(intr_handle, count,
86 process_private->rxq_fds[i]))
91 tap_rx_intr_vec_uninstall(dev);
92 else if (rte_intr_nb_efd_set(intr_handle, count))
98 * Register or unregister the Rx interrupts.
101 * Pointer to the tap rte_eth_dev device structure.
103 * should the operation be register or unregister the interrupts.
106 * 0 on success, negative errno value otherwise and rte_errno is set.
109 tap_rx_intr_vec_set(struct rte_eth_dev *dev, int set)
111 tap_rx_intr_vec_uninstall(dev);
113 return tap_rx_intr_vec_install(dev);