From b7b1ba64500cc09ec310f8805796b589fc9e69bb Mon Sep 17 00:00:00 2001 From: Nicolas Chautru Date: Sat, 18 Apr 2020 15:46:47 -0700 Subject: [PATCH] baseband/fpga_5gnr_fec: support interrupt Adding support for interrupt capability in the PMD and the related operations. Signed-off-by: Nicolas Chautru Acked-by: Dave Burley Acked-by: Niall Power Acked-by: Akhil Goyal --- .../fpga_5gnr_fec/rte_fpga_5gnr_fec.c | 139 ++++++++++++++++++ 1 file changed, 139 insertions(+) diff --git a/drivers/baseband/fpga_5gnr_fec/rte_fpga_5gnr_fec.c b/drivers/baseband/fpga_5gnr_fec/rte_fpga_5gnr_fec.c index 63d11ad19e..e152b206e7 100644 --- a/drivers/baseband/fpga_5gnr_fec/rte_fpga_5gnr_fec.c +++ b/drivers/baseband/fpga_5gnr_fec/rte_fpga_5gnr_fec.c @@ -325,6 +325,7 @@ fpga_dev_info_get(struct rte_bbdev *dev, RTE_BBDEV_LDPC_INTERNAL_HARQ_MEMORY_IN_ENABLE | RTE_BBDEV_LDPC_INTERNAL_HARQ_MEMORY_OUT_ENABLE | RTE_BBDEV_LDPC_INTERNAL_HARQ_MEMORY_LOOPBACK | + RTE_BBDEV_LDPC_DEC_INTERRUPTS | RTE_BBDEV_LDPC_INTERNAL_HARQ_MEMORY_FILLERS, .llr_size = 6, .llr_decimals = 2, @@ -636,14 +637,152 @@ fpga_queue_stop(struct rte_bbdev *dev, uint16_t queue_id) return 0; } +static inline uint16_t +get_queue_id(struct rte_bbdev_data *data, uint8_t q_idx) +{ + uint16_t queue_id; + + for (queue_id = 0; queue_id < data->num_queues; ++queue_id) { + struct fpga_queue *q = data->queues[queue_id].queue_private; + if (q != NULL && q->q_idx == q_idx) + return queue_id; + } + + return -1; +} + +/* Interrupt handler triggered by FPGA dev for handling specific interrupt */ +static void +fpga_dev_interrupt_handler(void *cb_arg) +{ + struct rte_bbdev *dev = cb_arg; + struct fpga_5gnr_fec_device *fpga_dev = dev->data->dev_private; + struct fpga_queue *q; + uint64_t ring_head; + uint64_t q_idx; + uint16_t queue_id; + uint8_t i; + + /* Scan queue assigned to this device */ + for (i = 0; i < FPGA_TOTAL_NUM_QUEUES; ++i) { + q_idx = 1ULL << i; + if (fpga_dev->q_bound_bit_map & q_idx) { + queue_id = get_queue_id(dev->data, i); + if (queue_id == (uint16_t) -1) + continue; + + /* Check if completion head was changed */ + q = dev->data->queues[queue_id].queue_private; + ring_head = *q->ring_head_addr; + if (q->shadow_completion_head != ring_head && + q->irq_enable == 1) { + q->shadow_completion_head = ring_head; + rte_bbdev_pmd_callback_process( + dev, + RTE_BBDEV_EVENT_DEQUEUE, + &queue_id); + } + } + } +} + +static int +fpga_queue_intr_enable(struct rte_bbdev *dev, uint16_t queue_id) +{ + struct fpga_queue *q = dev->data->queues[queue_id].queue_private; + + if (!rte_intr_cap_multiple(dev->intr_handle)) + return -ENOTSUP; + + q->irq_enable = 1; + + return 0; +} + +static int +fpga_queue_intr_disable(struct rte_bbdev *dev, uint16_t queue_id) +{ + struct fpga_queue *q = dev->data->queues[queue_id].queue_private; + q->irq_enable = 0; + + return 0; +} + +static int +fpga_intr_enable(struct rte_bbdev *dev) +{ + int ret; + uint8_t i; + + if (!rte_intr_cap_multiple(dev->intr_handle)) { + rte_bbdev_log(ERR, "Multiple intr vector is not supported by FPGA (%s)", + dev->data->name); + return -ENOTSUP; + } + + /* Create event file descriptors for each of 64 queue. Event fds will be + * mapped to FPGA IRQs in rte_intr_enable(). This is a 1:1 mapping where + * the IRQ number is a direct translation to the queue number. + * + * 63 (FPGA_NUM_INTR_VEC) event fds are created as rte_intr_enable() + * mapped the first IRQ to already created interrupt event file + * descriptor (intr_handle->fd). + */ + if (rte_intr_efd_enable(dev->intr_handle, FPGA_NUM_INTR_VEC)) { + rte_bbdev_log(ERR, "Failed to create fds for %u queues", + dev->data->num_queues); + return -1; + } + + /* TODO Each event file descriptor is overwritten by interrupt event + * file descriptor. That descriptor is added to epoll observed list. + * It ensures that callback function assigned to that descriptor will + * invoked when any FPGA queue issues interrupt. + */ + for (i = 0; i < FPGA_NUM_INTR_VEC; ++i) + dev->intr_handle->efds[i] = dev->intr_handle->fd; + + if (!dev->intr_handle->intr_vec) { + dev->intr_handle->intr_vec = rte_zmalloc("intr_vec", + dev->data->num_queues * sizeof(int), 0); + if (!dev->intr_handle->intr_vec) { + rte_bbdev_log(ERR, "Failed to allocate %u vectors", + dev->data->num_queues); + return -ENOMEM; + } + } + + ret = rte_intr_enable(dev->intr_handle); + if (ret < 0) { + rte_bbdev_log(ERR, + "Couldn't enable interrupts for device: %s", + dev->data->name); + return ret; + } + + ret = rte_intr_callback_register(dev->intr_handle, + fpga_dev_interrupt_handler, dev); + if (ret < 0) { + rte_bbdev_log(ERR, + "Couldn't register interrupt callback for device: %s", + dev->data->name); + return ret; + } + + return 0; +} + static const struct rte_bbdev_ops fpga_ops = { .setup_queues = fpga_setup_queues, + .intr_enable = fpga_intr_enable, .close = fpga_dev_close, .info_get = fpga_dev_info_get, .queue_setup = fpga_queue_setup, .queue_stop = fpga_queue_stop, .queue_start = fpga_queue_start, .queue_release = fpga_queue_release, + .queue_intr_enable = fpga_queue_intr_enable, + .queue_intr_disable = fpga_queue_intr_disable }; static inline void -- 2.20.1