5feecc57d9
Aligning Mellanox SPDX copyrights to a single format. In addition replace to SPDX licence files which were missed. Signed-off-by: Shahaf Shuler <shahafs@mellanox.com> Acked-by: Adrien Mazarguil <adrien.mazarguil@6wind.com>
111 lines
2.6 KiB
C
111 lines
2.6 KiB
C
/* SPDX-License-Identifier: BSD-3-Clause
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* Copyright 2018 Mellanox Technologies, Ltd
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*/
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/**
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* @file
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* Interrupts handling for tap driver.
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*/
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#include <assert.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <signal.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <rte_eth_tap.h>
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#include <rte_errno.h>
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#include <rte_interrupts.h>
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/**
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* Unregister Rx interrupts free the queue interrupt vector.
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*
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* @param dev
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* Pointer to the tap rte_eth_dev structure.
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*/
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static void
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tap_rx_intr_vec_uninstall(struct rte_eth_dev *dev)
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{
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struct pmd_internals *pmd = dev->data->dev_private;
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struct rte_intr_handle *intr_handle = &pmd->intr_handle;
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rte_intr_free_epoll_fd(intr_handle);
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free(intr_handle->intr_vec);
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intr_handle->intr_vec = NULL;
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intr_handle->nb_efd = 0;
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}
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/**
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* Allocate Rx queue interrupt vector and register Rx interrupts.
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*
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* @param dev
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* Pointer to the tap rte_eth_dev device structure.
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*
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* @return
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* 0 on success, negative errno value otherwise and rte_errno is set.
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*/
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static int
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tap_rx_intr_vec_install(struct rte_eth_dev *dev)
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{
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struct pmd_internals *pmd = dev->data->dev_private;
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unsigned int rxqs_n = pmd->dev->data->nb_rx_queues;
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struct rte_intr_handle *intr_handle = &pmd->intr_handle;
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unsigned int n = RTE_MIN(rxqs_n, (uint32_t)RTE_MAX_RXTX_INTR_VEC_ID);
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unsigned int i;
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unsigned int count = 0;
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if (!dev->data->dev_conf.intr_conf.rxq)
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return 0;
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intr_handle->intr_vec = malloc(sizeof(intr_handle->intr_vec[rxqs_n]));
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if (intr_handle->intr_vec == NULL) {
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rte_errno = ENOMEM;
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RTE_LOG(ERR, PMD,
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"failed to allocate memory for interrupt vector,"
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" Rx interrupts will not be supported");
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return -rte_errno;
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}
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for (i = 0; i < n; i++) {
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struct rx_queue *rxq = pmd->dev->data->rx_queues[i];
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/* Skip queues that cannot request interrupts. */
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if (!rxq || rxq->fd <= 0) {
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/* Use invalid intr_vec[] index to disable entry. */
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intr_handle->intr_vec[i] =
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RTE_INTR_VEC_RXTX_OFFSET +
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RTE_MAX_RXTX_INTR_VEC_ID;
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continue;
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}
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intr_handle->intr_vec[i] = RTE_INTR_VEC_RXTX_OFFSET + count;
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intr_handle->efds[count] = rxq->fd;
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count++;
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}
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if (!count)
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tap_rx_intr_vec_uninstall(dev);
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else
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intr_handle->nb_efd = count;
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return 0;
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}
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/**
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* Register or unregister the Rx interrupts.
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*
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* @param dev
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* Pointer to the tap rte_eth_dev device structure.
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* @param set
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* should the operation be register or unregister the interrupts.
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*
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* @return
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* 0 on success, negative errno value otherwise and rte_errno is set.
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*/
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int
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tap_rx_intr_vec_set(struct rte_eth_dev *dev, int set)
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{
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tap_rx_intr_vec_uninstall(dev);
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if (set)
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return tap_rx_intr_vec_install(dev);
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return 0;
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}
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