/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (c) 2015-2024 Amazon.com, Inc. or its affiliates.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <sys/param.h>
#include "opt_rss.h"

#include "ena_rss.h"
#include "ena_sysctl.h"

static void ena_sysctl_add_wd(struct ena_adapter *);
static void ena_sysctl_add_stats(struct ena_adapter *);
static void ena_sysctl_add_eni_metrics(struct ena_adapter *);
static void ena_sysctl_add_customer_metrics(struct ena_adapter *);
static void ena_sysctl_add_srd_info(struct ena_adapter *);
static void ena_sysctl_add_tuneables(struct ena_adapter *);
static void ena_sysctl_add_irq_affinity(struct ena_adapter *);
/* Kernel option RSS prevents manipulation of key hash and indirection table. */
#ifndef RSS
static void ena_sysctl_add_rss(struct ena_adapter *);
#endif
static int ena_sysctl_buf_ring_size(SYSCTL_HANDLER_ARGS);
static int ena_sysctl_rx_queue_size(SYSCTL_HANDLER_ARGS);
static int ena_sysctl_io_queues_nb(SYSCTL_HANDLER_ARGS);
static int ena_sysctl_irq_base_cpu(SYSCTL_HANDLER_ARGS);
static int ena_sysctl_irq_cpu_stride(SYSCTL_HANDLER_ARGS);
static int ena_sysctl_metrics_interval(SYSCTL_HANDLER_ARGS);
#ifndef RSS
static int ena_sysctl_rss_key(SYSCTL_HANDLER_ARGS);
static int ena_sysctl_rss_indir_table(SYSCTL_HANDLER_ARGS);
#endif

/* Limit max ENA sample rate to be an hour. */
#define ENA_METRICS_MAX_SAMPLE_INTERVAL 3600
#define ENA_HASH_KEY_MSG_SIZE (ENA_HASH_KEY_SIZE * 2 + 1)

#define SYSCTL_GSTRING_LEN 128

#define ENA_METRIC_ENI_ENTRY(stat, desc) { \
        .name = #stat, \
        .description = #desc, \
}

#define ENA_STAT_ENTRY(stat, desc, stat_type) { \
        .name = #stat, \
        .description = #desc, \
        .stat_offset = offsetof(struct ena_admin_##stat_type, stat) / sizeof(u64), \
}

#define ENA_STAT_ENA_SRD_ENTRY(stat, desc) \
        ENA_STAT_ENTRY(stat, desc, ena_srd_stats)

struct ena_hw_metrics {
        char name[SYSCTL_GSTRING_LEN];
        char description[SYSCTL_GSTRING_LEN];
};

struct ena_srd_metrics {
        char name[SYSCTL_GSTRING_LEN];
        char description[SYSCTL_GSTRING_LEN];
        int stat_offset;
};

static const struct ena_srd_metrics ena_srd_stats_strings[] = {
        ENA_STAT_ENA_SRD_ENTRY(
            ena_srd_tx_pkts, Number of packets transmitted over ENA SRD),
        ENA_STAT_ENA_SRD_ENTRY(
            ena_srd_eligible_tx_pkts, Number of packets transmitted or could
            have been transmitted over ENA SRD),
        ENA_STAT_ENA_SRD_ENTRY(
            ena_srd_rx_pkts, Number of packets received over ENA SRD),
        ENA_STAT_ENA_SRD_ENTRY(
            ena_srd_resource_utilization, Percentage of the ENA SRD resources
            that are in use),
};

static const struct ena_hw_metrics ena_hw_stats_strings[] = {
        ENA_METRIC_ENI_ENTRY(
            bw_in_allowance_exceeded, Inbound BW allowance exceeded),
        ENA_METRIC_ENI_ENTRY(
            bw_out_allowance_exceeded, Outbound BW allowance exceeded),
        ENA_METRIC_ENI_ENTRY(
            pps_allowance_exceeded, PPS allowance exceeded),
        ENA_METRIC_ENI_ENTRY(
            conntrack_allowance_exceeded, Connection tracking allowance exceeded),
        ENA_METRIC_ENI_ENTRY(
            linklocal_allowance_exceeded, Linklocal packet rate allowance),
        ENA_METRIC_ENI_ENTRY(
            conntrack_allowance_available, Number of available conntracks),
};

#ifndef ARRAY_SIZE
#define ARRAY_SIZE(a) (sizeof(a) / sizeof(a[0]))
#endif

#define ENA_CUSTOMER_METRICS_ARRAY_SIZE      ARRAY_SIZE(ena_hw_stats_strings)
#define ENA_SRD_METRICS_ARRAY_SIZE           ARRAY_SIZE(ena_srd_stats_strings)

static SYSCTL_NODE(_hw, OID_AUTO, ena, CTLFLAG_RD | CTLFLAG_MPSAFE, 0,
    "ENA driver parameters");

/*
 * Logging level for changing verbosity of the output
 */
int ena_log_level = ENA_INFO;
SYSCTL_INT(_hw_ena, OID_AUTO, log_level, CTLFLAG_RWTUN, &ena_log_level, 0,
    "Logging level indicating verbosity of the logs");

SYSCTL_CONST_STRING(_hw_ena, OID_AUTO, driver_version, CTLFLAG_RD,
    ENA_DRV_MODULE_VERSION, "ENA driver version");

/*
 * Use 9k mbufs for the Rx buffers. Default to 0 (use page size mbufs instead).
 * Using 9k mbufs in low memory conditions might cause allocation to take a lot
 * of time and lead to the OS instability as it needs to look for the contiguous
 * pages.
 * However, page size mbufs has a bit smaller throughput than 9k mbufs, so if
 * the network performance is the priority, the 9k mbufs can be used.
 */
int ena_enable_9k_mbufs = 0;
SYSCTL_INT(_hw_ena, OID_AUTO, enable_9k_mbufs, CTLFLAG_RDTUN,
    &ena_enable_9k_mbufs, 0, "Use 9 kB mbufs for Rx descriptors");

/*
 * Force the driver to use large or regular LLQ (Low Latency Queue) header size.
 * Defaults to ENA_LLQ_HEADER_SIZE_POLICY_DEFAULT. This option may be
 * important for platforms, which often handle packet headers on Tx with total
 * header size greater than 96B, as it may reduce the latency.
 * It also reduces the maximum Tx queue size by half, so it may cause more Tx
 * packet drops.
 */
int ena_force_large_llq_header = ENA_LLQ_HEADER_SIZE_POLICY_DEFAULT;
SYSCTL_INT(_hw_ena, OID_AUTO, force_large_llq_header, CTLFLAG_RDTUN,
    &ena_force_large_llq_header, 0,
    "Change default LLQ entry size received from the device");

int ena_rss_table_size = ENA_RX_RSS_TABLE_SIZE;

int ena_sysctl_allocate_customer_metrics_buffer(struct ena_adapter *adapter)
{
        int rc = 0;

        adapter->customer_metrics_array = malloc((sizeof(u64) * ENA_CUSTOMER_METRICS_ARRAY_SIZE),
            M_DEVBUF, M_NOWAIT | M_ZERO);
        if (unlikely(adapter->customer_metrics_array == NULL))
                rc = ENOMEM;

        return rc;
}
void
ena_sysctl_add_nodes(struct ena_adapter *adapter)
{
        struct ena_com_dev *dev = adapter->ena_dev;

        if (ena_com_get_cap(dev, ENA_ADMIN_CUSTOMER_METRICS))
                ena_sysctl_add_customer_metrics(adapter);
        else if (ena_com_get_cap(dev, ENA_ADMIN_ENI_STATS))
                ena_sysctl_add_eni_metrics(adapter);

        if (ena_com_get_cap(adapter->ena_dev, ENA_ADMIN_ENA_SRD_INFO))
                ena_sysctl_add_srd_info(adapter);

        ena_sysctl_add_wd(adapter);
        ena_sysctl_add_stats(adapter);
        ena_sysctl_add_tuneables(adapter);
        ena_sysctl_add_irq_affinity(adapter);
#ifndef RSS
        ena_sysctl_add_rss(adapter);
#endif
}

static void
ena_sysctl_add_wd(struct ena_adapter *adapter)
{
        device_t dev;

        struct sysctl_ctx_list *ctx;
        struct sysctl_oid *tree;
        struct sysctl_oid_list *child;

        dev = adapter->pdev;

        ctx = device_get_sysctl_ctx(dev);
        tree = device_get_sysctl_tree(dev);
        child = SYSCTL_CHILDREN(tree);

        /* Sysctl calls for Watchdog service */
        SYSCTL_ADD_INT(ctx, child, OID_AUTO, "wd_active", CTLFLAG_RWTUN,
            &adapter->wd_active, 0, "Watchdog is active");

        SYSCTL_ADD_QUAD(ctx, child, OID_AUTO, "keep_alive_timeout",
            CTLFLAG_RWTUN, &adapter->keep_alive_timeout,
            "Timeout for Keep Alive messages");

        SYSCTL_ADD_QUAD(ctx, child, OID_AUTO, "missing_tx_timeout",
            CTLFLAG_RWTUN, &adapter->missing_tx_timeout,
            "Timeout for TX completion");

        SYSCTL_ADD_U32(ctx, child, OID_AUTO, "missing_tx_max_queues",
            CTLFLAG_RWTUN, &adapter->missing_tx_max_queues, 0,
            "Number of TX queues to check per run");

        SYSCTL_ADD_U32(ctx, child, OID_AUTO, "missing_tx_threshold",
            CTLFLAG_RWTUN, &adapter->missing_tx_threshold, 0,
            "Max number of timeouted packets");
}

static void
ena_sysctl_add_stats(struct ena_adapter *adapter)
{
        device_t dev;

        struct ena_ring *tx_ring;
        struct ena_ring *rx_ring;

        struct ena_hw_stats *hw_stats;
        struct ena_stats_dev *dev_stats;
        struct ena_stats_tx *tx_stats;
        struct ena_stats_rx *rx_stats;
        struct ena_com_stats_admin *admin_stats;

        struct sysctl_ctx_list *ctx;
        struct sysctl_oid *tree;
        struct sysctl_oid_list *child;

        struct sysctl_oid *queue_node, *tx_node, *rx_node, *hw_node;
        struct sysctl_oid *admin_node;
        struct sysctl_oid_list *queue_list, *tx_list, *rx_list, *hw_list;
        struct sysctl_oid_list *admin_list;

#define QUEUE_NAME_LEN 32
        char namebuf[QUEUE_NAME_LEN];
        int i;

        dev = adapter->pdev;

        ctx = device_get_sysctl_ctx(dev);
        tree = device_get_sysctl_tree(dev);
        child = SYSCTL_CHILDREN(tree);

        tx_ring = adapter->tx_ring;
        rx_ring = adapter->rx_ring;

        hw_stats = &adapter->hw_stats;
        dev_stats = &adapter->dev_stats;
        admin_stats = &adapter->ena_dev->admin_queue.stats;

        SYSCTL_ADD_COUNTER_U64(ctx, child, OID_AUTO, "wd_expired", CTLFLAG_RD,
            &dev_stats->wd_expired, "Watchdog expiry count");
        SYSCTL_ADD_COUNTER_U64(ctx, child, OID_AUTO, "interface_up", CTLFLAG_RD,
            &dev_stats->interface_up, "Network interface up count");
        SYSCTL_ADD_COUNTER_U64(ctx, child, OID_AUTO, "interface_down", CTLFLAG_RD,
            &dev_stats->interface_down, "Network interface down count");
        SYSCTL_ADD_COUNTER_U64(ctx, child, OID_AUTO, "admin_q_pause", CTLFLAG_RD,
            &dev_stats->admin_q_pause, "Admin queue pauses");
        SYSCTL_ADD_COUNTER_U64(ctx, child, OID_AUTO, "os_trigger", CTLFLAG_RD,
            &dev_stats->os_trigger, "OS trigger count");
        SYSCTL_ADD_COUNTER_U64(ctx, child, OID_AUTO, "missing_tx_cmpl", CTLFLAG_RD,
            &dev_stats->missing_tx_cmpl, "Missing TX completions resets count");
        SYSCTL_ADD_COUNTER_U64(ctx, child, OID_AUTO, "bad_rx_req_id", CTLFLAG_RD,
            &dev_stats->bad_rx_req_id, "Bad RX req id count");
        SYSCTL_ADD_COUNTER_U64(ctx, child, OID_AUTO, "bad_tx_req_id", CTLFLAG_RD,
            &dev_stats->bad_tx_req_id, "Bad TX req id count");
        SYSCTL_ADD_COUNTER_U64(ctx, child, OID_AUTO, "bad_rx_desc_num", CTLFLAG_RD,
            &dev_stats->bad_rx_desc_num, "Bad RX descriptors number count");
        SYSCTL_ADD_COUNTER_U64(ctx, child, OID_AUTO, "invalid_state", CTLFLAG_RD,
            &dev_stats->invalid_state, "Driver invalid state count");
        SYSCTL_ADD_COUNTER_U64(ctx, child, OID_AUTO, "missing_intr", CTLFLAG_RD,
            &dev_stats->missing_intr, "Missing interrupt count");
        SYSCTL_ADD_COUNTER_U64(ctx, child, OID_AUTO, "tx_desc_malformed", CTLFLAG_RD,
            &dev_stats->tx_desc_malformed, "TX descriptors malformed count");
        SYSCTL_ADD_COUNTER_U64(ctx, child, OID_AUTO, "rx_desc_malformed", CTLFLAG_RD,
            &dev_stats->rx_desc_malformed, "RX descriptors malformed count");
        SYSCTL_ADD_COUNTER_U64(ctx, child, OID_AUTO, "missing_admin_interrupt", CTLFLAG_RD,
            &dev_stats->missing_admin_interrupt, "Missing admin interrupts count");
        SYSCTL_ADD_COUNTER_U64(ctx, child, OID_AUTO, "admin_to", CTLFLAG_RD,
            &dev_stats->admin_to, "Admin queue timeouts count");
        SYSCTL_ADD_COUNTER_U64(ctx, child, OID_AUTO, "device_request_reset", CTLFLAG_RD,
            &dev_stats->device_request_reset, "Device reset requests count");
        SYSCTL_ADD_COUNTER_U64(ctx, child, OID_AUTO, "total_resets", CTLFLAG_RD,
            &dev_stats->total_resets, "Total resets count");

        for (i = 0; i < adapter->num_io_queues; ++i, ++tx_ring, ++rx_ring) {
                snprintf(namebuf, QUEUE_NAME_LEN, "queue%d", i);

                queue_node = SYSCTL_ADD_NODE(ctx, child, OID_AUTO, namebuf,
                    CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, "Queue Name");
                queue_list = SYSCTL_CHILDREN(queue_node);

                adapter->que[i].oid = queue_node;

#ifdef RSS
                /* Common stats */
                SYSCTL_ADD_INT(ctx, queue_list, OID_AUTO, "cpu", CTLFLAG_RD,
                    &adapter->que[i].cpu, 0, "CPU affinity");
                SYSCTL_ADD_INT(ctx, queue_list, OID_AUTO, "domain", CTLFLAG_RD,
                    &adapter->que[i].domain, 0, "NUMA domain");
#endif

                /* TX specific stats */
                tx_node = SYSCTL_ADD_NODE(ctx, queue_list, OID_AUTO, "tx_ring",
                    CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, "TX ring");
                tx_list = SYSCTL_CHILDREN(tx_node);

                tx_stats = &tx_ring->tx_stats;

                SYSCTL_ADD_COUNTER_U64(ctx, tx_list, OID_AUTO, "count",
                    CTLFLAG_RD, &tx_stats->cnt, "Packets sent");
                SYSCTL_ADD_COUNTER_U64(ctx, tx_list, OID_AUTO, "bytes",
                    CTLFLAG_RD, &tx_stats->bytes, "Bytes sent");
                SYSCTL_ADD_COUNTER_U64(ctx, tx_list, OID_AUTO,
                    "prepare_ctx_err", CTLFLAG_RD, &tx_stats->prepare_ctx_err,
                    "TX buffer preparation failures");
                SYSCTL_ADD_COUNTER_U64(ctx, tx_list, OID_AUTO,
                    "dma_mapping_err", CTLFLAG_RD, &tx_stats->dma_mapping_err,
                    "DMA mapping failures");
                SYSCTL_ADD_COUNTER_U64(ctx, tx_list, OID_AUTO, "doorbells",
                    CTLFLAG_RD, &tx_stats->doorbells, "Queue doorbells");
                SYSCTL_ADD_COUNTER_U64(ctx, tx_list, OID_AUTO,
                    "missing_tx_comp", CTLFLAG_RD, &tx_stats->missing_tx_comp,
                    "TX completions missed");
                SYSCTL_ADD_COUNTER_U64(ctx, tx_list, OID_AUTO, "bad_req_id",
                    CTLFLAG_RD, &tx_stats->bad_req_id, "Bad request id count");
                SYSCTL_ADD_COUNTER_U64(ctx, tx_list, OID_AUTO, "mbuf_collapses",
                    CTLFLAG_RD, &tx_stats->collapse, "Mbuf collapse count");
                SYSCTL_ADD_COUNTER_U64(ctx, tx_list, OID_AUTO,
                    "mbuf_collapse_err", CTLFLAG_RD, &tx_stats->collapse_err,
                    "Mbuf collapse failures");
                SYSCTL_ADD_COUNTER_U64(ctx, tx_list, OID_AUTO, "queue_wakeups",
                    CTLFLAG_RD, &tx_stats->queue_wakeup, "Queue wakeups");
                SYSCTL_ADD_COUNTER_U64(ctx, tx_list, OID_AUTO, "queue_stops",
                    CTLFLAG_RD, &tx_stats->queue_stop, "Queue stops");
                SYSCTL_ADD_COUNTER_U64(ctx, tx_list, OID_AUTO,
                    "llq_buffer_copy", CTLFLAG_RD, &tx_stats->llq_buffer_copy,
                    "Header copies for llq transaction");
                SYSCTL_ADD_COUNTER_U64(ctx, tx_list, OID_AUTO,
                    "unmask_interrupt_num", CTLFLAG_RD,
                    &tx_stats->unmask_interrupt_num,
                    "Unmasked interrupt count");

                /* RX specific stats */
                rx_node = SYSCTL_ADD_NODE(ctx, queue_list, OID_AUTO, "rx_ring",
                    CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, "RX ring");
                rx_list = SYSCTL_CHILDREN(rx_node);

                rx_stats = &rx_ring->rx_stats;

                SYSCTL_ADD_COUNTER_U64(ctx, rx_list, OID_AUTO, "count",
                    CTLFLAG_RD, &rx_stats->cnt, "Packets received");
                SYSCTL_ADD_COUNTER_U64(ctx, rx_list, OID_AUTO, "bytes",
                    CTLFLAG_RD, &rx_stats->bytes, "Bytes received");
                SYSCTL_ADD_COUNTER_U64(ctx, rx_list, OID_AUTO, "refil_partial",
                    CTLFLAG_RD, &rx_stats->refil_partial,
                    "Partial refilled mbufs");
                SYSCTL_ADD_COUNTER_U64(ctx, rx_list, OID_AUTO, "csum_bad",
                    CTLFLAG_RD, &rx_stats->csum_bad, "Bad RX checksum");
                SYSCTL_ADD_COUNTER_U64(ctx, rx_list, OID_AUTO,
                    "mbuf_alloc_fail", CTLFLAG_RD, &rx_stats->mbuf_alloc_fail,
                    "Failed mbuf allocs");
                SYSCTL_ADD_COUNTER_U64(ctx, rx_list, OID_AUTO,
                    "mjum_alloc_fail", CTLFLAG_RD, &rx_stats->mjum_alloc_fail,
                    "Failed jumbo mbuf allocs");
                SYSCTL_ADD_COUNTER_U64(ctx, rx_list, OID_AUTO,
                    "dma_mapping_err", CTLFLAG_RD, &rx_stats->dma_mapping_err,
                    "DMA mapping errors");
                SYSCTL_ADD_COUNTER_U64(ctx, rx_list, OID_AUTO, "bad_desc_num",
                    CTLFLAG_RD, &rx_stats->bad_desc_num,
                    "Bad descriptor count");
                SYSCTL_ADD_COUNTER_U64(ctx, rx_list, OID_AUTO, "bad_req_id",
                    CTLFLAG_RD, &rx_stats->bad_req_id, "Bad request id count");
                SYSCTL_ADD_COUNTER_U64(ctx, rx_list, OID_AUTO, "empty_rx_ring",
                    CTLFLAG_RD, &rx_stats->empty_rx_ring,
                    "RX descriptors depletion count");
                SYSCTL_ADD_COUNTER_U64(ctx, rx_list, OID_AUTO, "csum_good",
                    CTLFLAG_RD, &rx_stats->csum_good,
                    "Valid RX checksum calculations");
        }

        /* Stats read from device */
        hw_node = SYSCTL_ADD_NODE(ctx, child, OID_AUTO, "hw_stats",
            CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, "Statistics from hardware");
        hw_list = SYSCTL_CHILDREN(hw_node);

        SYSCTL_ADD_COUNTER_U64(ctx, hw_list, OID_AUTO, "rx_packets", CTLFLAG_RD,
            &hw_stats->rx_packets, "Packets received");
        SYSCTL_ADD_COUNTER_U64(ctx, hw_list, OID_AUTO, "tx_packets", CTLFLAG_RD,
            &hw_stats->tx_packets, "Packets transmitted");
        SYSCTL_ADD_COUNTER_U64(ctx, hw_list, OID_AUTO, "rx_bytes", CTLFLAG_RD,
            &hw_stats->rx_bytes, "Bytes received");
        SYSCTL_ADD_COUNTER_U64(ctx, hw_list, OID_AUTO, "tx_bytes", CTLFLAG_RD,
            &hw_stats->tx_bytes, "Bytes transmitted");
        SYSCTL_ADD_COUNTER_U64(ctx, hw_list, OID_AUTO, "rx_drops", CTLFLAG_RD,
            &hw_stats->rx_drops, "Receive packet drops");
        SYSCTL_ADD_COUNTER_U64(ctx, hw_list, OID_AUTO, "tx_drops", CTLFLAG_RD,
            &hw_stats->tx_drops, "Transmit packet drops");

        /* ENA Admin queue stats */
        admin_node = SYSCTL_ADD_NODE(ctx, child, OID_AUTO, "admin_stats",
            CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, "ENA Admin Queue statistics");
        admin_list = SYSCTL_CHILDREN(admin_node);

        SYSCTL_ADD_U64(ctx, admin_list, OID_AUTO, "aborted_cmd", CTLFLAG_RD,
            &admin_stats->aborted_cmd, 0, "Aborted commands");
        SYSCTL_ADD_U64(ctx, admin_list, OID_AUTO, "sumbitted_cmd", CTLFLAG_RD,
            &admin_stats->submitted_cmd, 0, "Submitted commands");
        SYSCTL_ADD_U64(ctx, admin_list, OID_AUTO, "completed_cmd", CTLFLAG_RD,
            &admin_stats->completed_cmd, 0, "Completed commands");
        SYSCTL_ADD_U64(ctx, admin_list, OID_AUTO, "out_of_space", CTLFLAG_RD,
            &admin_stats->out_of_space, 0, "Queue out of space");
        SYSCTL_ADD_U64(ctx, admin_list, OID_AUTO, "no_completion", CTLFLAG_RD,
            &admin_stats->no_completion, 0, "Commands not completed");
}

static void
ena_sysctl_add_srd_info(struct ena_adapter *adapter)
{
        device_t dev;

        struct sysctl_oid *ena_srd_info;
        struct sysctl_oid_list *srd_list;

        struct sysctl_ctx_list *ctx;
        struct sysctl_oid *tree;
        struct sysctl_oid_list *child;

        struct ena_admin_ena_srd_stats *srd_stats_ptr;
        struct ena_srd_metrics cur_stat_strings;

        int i;

        dev = adapter->pdev;

        ctx = device_get_sysctl_ctx(dev);
        tree = device_get_sysctl_tree(dev);
        child = SYSCTL_CHILDREN(tree);

        ena_srd_info = SYSCTL_ADD_NODE(ctx, child, OID_AUTO, "ena_srd_info",
            CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, "ENA's SRD information");
        srd_list = SYSCTL_CHILDREN(ena_srd_info);

        SYSCTL_ADD_U64(ctx, srd_list, OID_AUTO, "ena_srd_mode",
            CTLFLAG_RD, &adapter->ena_srd_info.flags, 0,
            "Describes which ENA-express features are enabled");

        srd_stats_ptr = &adapter->ena_srd_info.ena_srd_stats;

        for (i = 0 ; i < ENA_SRD_METRICS_ARRAY_SIZE; i++) {
                cur_stat_strings = ena_srd_stats_strings[i];
                SYSCTL_ADD_U64(ctx, srd_list, OID_AUTO, cur_stat_strings.name,
                    CTLFLAG_RD, (u64 *)srd_stats_ptr + cur_stat_strings.stat_offset,
                    0, cur_stat_strings.description);
        }
}

static void
ena_sysctl_add_customer_metrics(struct ena_adapter *adapter)
{
        device_t dev;
        struct ena_com_dev *ena_dev;

        struct sysctl_ctx_list *ctx;
        struct sysctl_oid *tree;
        struct sysctl_oid_list *child;

        struct sysctl_oid *customer_metric;
        struct sysctl_oid_list *customer_list;

        int i;

        dev = adapter->pdev;
        ena_dev = adapter->ena_dev;

        ctx = device_get_sysctl_ctx(dev);
        tree = device_get_sysctl_tree(dev);
        child = SYSCTL_CHILDREN(tree);
        customer_metric = SYSCTL_ADD_NODE(ctx, child, OID_AUTO, "customer_metrics",
            CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, "ENA's customer metrics");
        customer_list = SYSCTL_CHILDREN(customer_metric);

        for (i = 0; i < ENA_CUSTOMER_METRICS_ARRAY_SIZE; i++) {
                if (ena_com_get_customer_metric_support(ena_dev, i)) {
                        SYSCTL_ADD_U64(ctx, customer_list, OID_AUTO, ena_hw_stats_strings[i].name,
                            CTLFLAG_RD, &adapter->customer_metrics_array[i], 0,
                            ena_hw_stats_strings[i].description);
                 }
         }
}

static void
ena_sysctl_add_eni_metrics(struct ena_adapter *adapter)
{
        device_t dev;
        struct ena_admin_eni_stats *eni_metrics;

        struct sysctl_ctx_list *ctx;
        struct sysctl_oid *tree;
        struct sysctl_oid_list *child;

        struct sysctl_oid *eni_node;
        struct sysctl_oid_list *eni_list;

        dev = adapter->pdev;

        ctx = device_get_sysctl_ctx(dev);
        tree = device_get_sysctl_tree(dev);
        child = SYSCTL_CHILDREN(tree);

        eni_node = SYSCTL_ADD_NODE(ctx, child, OID_AUTO, "eni_metrics",
            CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, "ENA's ENI metrics");
        eni_list = SYSCTL_CHILDREN(eni_node);

        eni_metrics = &adapter->eni_metrics;

        SYSCTL_ADD_U64(ctx, eni_list, OID_AUTO, "bw_in_allowance_exceeded",
            CTLFLAG_RD, &eni_metrics->bw_in_allowance_exceeded, 0,
            "Inbound BW allowance exceeded");
        SYSCTL_ADD_U64(ctx, eni_list, OID_AUTO, "bw_out_allowance_exceeded",
            CTLFLAG_RD, &eni_metrics->bw_out_allowance_exceeded, 0,
            "Outbound BW allowance exceeded");
        SYSCTL_ADD_U64(ctx, eni_list, OID_AUTO, "pps_allowance_exceeded",
            CTLFLAG_RD, &eni_metrics->pps_allowance_exceeded, 0,
            "PPS allowance exceeded");
        SYSCTL_ADD_U64(ctx, eni_list, OID_AUTO, "conntrack_allowance_exceeded",
            CTLFLAG_RD, &eni_metrics->conntrack_allowance_exceeded, 0,
            "Connection tracking allowance exceeded");
        SYSCTL_ADD_U64(ctx, eni_list, OID_AUTO, "linklocal_allowance_exceeded",
            CTLFLAG_RD, &eni_metrics->linklocal_allowance_exceeded, 0,
            "Linklocal packet rate allowance exceeded");
}

static void
ena_sysctl_add_tuneables(struct ena_adapter *adapter)
{
        device_t dev;

        struct sysctl_ctx_list *ctx;
        struct sysctl_oid *tree;
        struct sysctl_oid_list *child;

        dev = adapter->pdev;

        ctx = device_get_sysctl_ctx(dev);
        tree = device_get_sysctl_tree(dev);
        child = SYSCTL_CHILDREN(tree);

        /* Tuneable number of buffers in the buf-ring (drbr) */
        SYSCTL_ADD_PROC(ctx, child, OID_AUTO, "buf_ring_size",
            CTLTYPE_U32 | CTLFLAG_RW | CTLFLAG_MPSAFE, adapter, 0,
            ena_sysctl_buf_ring_size, "I",
            "Size of the Tx buffer ring (drbr).");

        /* Tuneable number of the Rx ring size */
        SYSCTL_ADD_PROC(ctx, child, OID_AUTO, "rx_queue_size",
            CTLTYPE_U32 | CTLFLAG_RW | CTLFLAG_MPSAFE, adapter, 0,
            ena_sysctl_rx_queue_size, "I",
            "Size of the Rx ring. The size should be a power of 2.");

        /* Tuneable number of IO queues */
        SYSCTL_ADD_PROC(ctx, child, OID_AUTO, "io_queues_nb",
            CTLTYPE_U32 | CTLFLAG_RW | CTLFLAG_MPSAFE, adapter, 0,
            ena_sysctl_io_queues_nb, "I", "Number of IO queues.");

        /*
         * Tuneable, which determines how often ENA metrics will be read.
         * 0 means it's turned off. Maximum allowed value is limited by:
         * ENA_METRICS_MAX_SAMPLE_INTERVAL.
         */
        SYSCTL_ADD_PROC(ctx, child, OID_AUTO, "stats_sample_interval",
            CTLTYPE_U16 | CTLFLAG_RW | CTLFLAG_MPSAFE, adapter, 0,
            ena_sysctl_metrics_interval, "SU",
            "Interval in seconds for updating Netword interface metrics. 0 turns off the update.");
}

/* Kernel option RSS prevents manipulation of key hash and indirection table. */
#ifndef RSS
static void
ena_sysctl_add_rss(struct ena_adapter *adapter)
{
        device_t dev;

        struct sysctl_ctx_list *ctx;
        struct sysctl_oid *tree;
        struct sysctl_oid_list *child;

        dev = adapter->pdev;

        ctx = device_get_sysctl_ctx(dev);
        tree = device_get_sysctl_tree(dev);
        child = SYSCTL_CHILDREN(tree);

        /* RSS options */
        tree = SYSCTL_ADD_NODE(ctx, child, OID_AUTO, "rss",
            CTLFLAG_RW | CTLFLAG_MPSAFE, NULL, "Receive Side Scaling options.");
        child = SYSCTL_CHILDREN(tree);

        /* RSS hash key */
        SYSCTL_ADD_PROC(ctx, child, OID_AUTO, "key",
            CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_MPSAFE, adapter, 0,
            ena_sysctl_rss_key, "A", "RSS key.");

        /* Tuneable RSS indirection table */
        SYSCTL_ADD_PROC(ctx, child, OID_AUTO, "indir_table",
            CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_MPSAFE, adapter, 0,
            ena_sysctl_rss_indir_table, "A", "RSS indirection table.");

        /* RSS indirection table size */
        SYSCTL_ADD_INT(ctx, child, OID_AUTO, "indir_table_size",
            CTLFLAG_RD | CTLFLAG_MPSAFE, &ena_rss_table_size, 0,
            "RSS indirection table size.");
}
#endif /* RSS */

static void
ena_sysctl_add_irq_affinity(struct ena_adapter *adapter)
{
        device_t dev;

        struct sysctl_ctx_list *ctx;
        struct sysctl_oid *tree;
        struct sysctl_oid_list *child;

        dev = adapter->pdev;

        ctx = device_get_sysctl_ctx(dev);
        tree = device_get_sysctl_tree(dev);
        child = SYSCTL_CHILDREN(tree);

        tree = SYSCTL_ADD_NODE(ctx, child, OID_AUTO, "irq_affinity",
            CTLFLAG_RW | CTLFLAG_MPSAFE, NULL, "Decide base CPU and stride for irqs affinity.");
        child = SYSCTL_CHILDREN(tree);

        /* Add base cpu leaf */
        SYSCTL_ADD_PROC(ctx, child, OID_AUTO, "base_cpu",
            CTLTYPE_S32 | CTLFLAG_RW | CTLFLAG_MPSAFE, adapter, 0,
            ena_sysctl_irq_base_cpu, "I", "Base cpu index for setting irq affinity.");

        /* Add cpu stride leaf */
        SYSCTL_ADD_PROC(ctx, child, OID_AUTO, "cpu_stride",
            CTLTYPE_S32 | CTLFLAG_RW | CTLFLAG_MPSAFE, adapter, 0,
            ena_sysctl_irq_cpu_stride, "I", "Distance between irqs when setting affinity.");
}


/*
 * ena_sysctl_update_queue_node_nb - Register/unregister sysctl queue nodes.
 *
 * Whether the nodes are registered or unregistered depends on a delta between
 * the `old` and `new` parameters, representing the number of queues.
 *
 * This function is used to hide sysctl attributes for queue nodes which aren't
 * currently used by the HW (e.g. after a call to `ena_sysctl_io_queues_nb`).
 *
 * NOTE:
 * All unregistered nodes must be registered again at detach, i.e. by a call to
 * this function.
 */
void
ena_sysctl_update_queue_node_nb(struct ena_adapter *adapter, int old, int new)
{
        struct sysctl_oid *oid;
        int min, max, i;

        min = MIN(old, new);
        max = MIN(MAX(old, new), adapter->max_num_io_queues);

        for (i = min; i < max; ++i) {
                oid = adapter->que[i].oid;

                sysctl_wlock();
                if (old > new)
                        sysctl_unregister_oid(oid);
                else
                        sysctl_register_oid(oid);
                sysctl_wunlock();
        }
}

static int
ena_sysctl_buf_ring_size(SYSCTL_HANDLER_ARGS)
{
        struct ena_adapter *adapter = arg1;
        uint32_t val;
        int error;

        ENA_LOCK_LOCK();
        if (unlikely(!ENA_FLAG_ISSET(ENA_FLAG_DEVICE_RUNNING, adapter))) {
                error = EINVAL;
                goto unlock;
        }

        val = 0;
        error = sysctl_wire_old_buffer(req, sizeof(val));
        if (error == 0) {
                val = adapter->buf_ring_size;
                error = sysctl_handle_32(oidp, &val, 0, req);
        }
        if (error != 0 || req->newptr == NULL)
                goto unlock;

        if (!powerof2(val) || val == 0) {
                ena_log(adapter->pdev, ERR,
                    "Requested new Tx buffer ring size (%u) is not a power of 2\n",
                    val);
                error = EINVAL;
                goto unlock;
        }

        if (val != adapter->buf_ring_size) {
                ena_log(adapter->pdev, INFO,
                    "Requested new Tx buffer ring size: %d. Old size: %d\n",
                    val, adapter->buf_ring_size);

                error = ena_update_buf_ring_size(adapter, val);
        } else {
                ena_log(adapter->pdev, ERR,
                    "New Tx buffer ring size is the same as already used: %u\n",
                    adapter->buf_ring_size);
        }

unlock:
        ENA_LOCK_UNLOCK();

        return (error);
}

static int
ena_sysctl_rx_queue_size(SYSCTL_HANDLER_ARGS)
{
        struct ena_adapter *adapter = arg1;
        uint32_t val;
        int error;

        ENA_LOCK_LOCK();
        if (unlikely(!ENA_FLAG_ISSET(ENA_FLAG_DEVICE_RUNNING, adapter))) {
                error = EINVAL;
                goto unlock;
        }

        val = 0;
        error = sysctl_wire_old_buffer(req, sizeof(val));
        if (error == 0) {
                val = adapter->requested_rx_ring_size;
                error = sysctl_handle_32(oidp, &val, 0, req);
        }
        if (error != 0 || req->newptr == NULL)
                goto unlock;

        if (val < ENA_MIN_RING_SIZE || val > adapter->max_rx_ring_size) {
                ena_log(adapter->pdev, ERR,
                    "Requested new Rx queue size (%u) is out of range: [%u, %u]\n",
                    val, ENA_MIN_RING_SIZE, adapter->max_rx_ring_size);
                error = EINVAL;
                goto unlock;
        }

        /* Check if the parameter is power of 2 */
        if (!powerof2(val)) {
                ena_log(adapter->pdev, ERR,
                    "Requested new Rx queue size (%u) is not a power of 2\n",
                    val);
                error = EINVAL;
                goto unlock;
        }

        if (val != adapter->requested_rx_ring_size) {
                ena_log(adapter->pdev, INFO,
                    "Requested new Rx queue size: %u. Old size: %u\n", val,
                    adapter->requested_rx_ring_size);

                error = ena_update_queue_size(adapter,
                    adapter->requested_tx_ring_size, val);
        } else {
                ena_log(adapter->pdev, ERR,
                    "New Rx queue size is the same as already used: %u\n",
                    adapter->requested_rx_ring_size);
        }

unlock:
        ENA_LOCK_UNLOCK();

        return (error);
}

/*
 * Change number of effectively used IO queues adapter->num_io_queues
 */
static int
ena_sysctl_io_queues_nb(SYSCTL_HANDLER_ARGS)
{
        struct ena_adapter *adapter = arg1;
        uint32_t old_num_queues, tmp = 0;
        int error;

        ENA_LOCK_LOCK();
        if (unlikely(!ENA_FLAG_ISSET(ENA_FLAG_DEVICE_RUNNING, adapter))) {
                error = EINVAL;
                goto unlock;
        }

        error = sysctl_wire_old_buffer(req, sizeof(tmp));
        if (error == 0) {
                tmp = adapter->num_io_queues;
                error = sysctl_handle_int(oidp, &tmp, 0, req);
        }
        if (error != 0 || req->newptr == NULL)
                goto unlock;

        if (tmp == 0) {
                ena_log(adapter->pdev, ERR,
                    "Requested number of IO queues is zero\n");
                error = EINVAL;
                goto unlock;
        }

        /*
         * The adapter::max_num_io_queues is the HW capability. The system
         * resources availability may potentially be a tighter limit. Therefore
         * the relation `adapter::max_num_io_queues >= adapter::msix_vecs`
         * always holds true, while the `adapter::msix_vecs` is variable across
         * device reset (`ena_destroy_device()` + `ena_restore_device()`).
         */
        if (tmp > (adapter->msix_vecs - ENA_ADMIN_MSIX_VEC)) {
                ena_log(adapter->pdev, ERR,
                    "Requested number of IO queues is higher than maximum allowed (%u)\n",
                    adapter->msix_vecs - ENA_ADMIN_MSIX_VEC);
                error = EINVAL;
                goto unlock;
        }
        if (tmp == adapter->num_io_queues) {
                ena_log(adapter->pdev, ERR,
                    "Requested number of IO queues is equal to current value "
                    "(%u)\n",
                    adapter->num_io_queues);
        } else {
                ena_log(adapter->pdev, INFO,
                    "Requested new number of IO queues: %u, current value: "
                    "%u\n",
                    tmp, adapter->num_io_queues);

                old_num_queues = adapter->num_io_queues;
                error = ena_update_io_queue_nb(adapter, tmp);
                if (error != 0)
                        return (error);

                ena_sysctl_update_queue_node_nb(adapter, old_num_queues, tmp);
        }

unlock:
        ENA_LOCK_UNLOCK();

        return (error);
}

static int
ena_sysctl_metrics_interval(SYSCTL_HANDLER_ARGS)
{
        struct ena_adapter *adapter = arg1;
        uint16_t interval;
        int error;

        ENA_LOCK_LOCK();
        if (unlikely(!ENA_FLAG_ISSET(ENA_FLAG_DEVICE_RUNNING, adapter))) {
                error = EINVAL;
                goto unlock;
        }

        error = sysctl_wire_old_buffer(req, sizeof(interval));
        if (error == 0) {
                interval = adapter->metrics_sample_interval;
                error = sysctl_handle_16(oidp, &interval, 0, req);
        }
        if (error != 0 || req->newptr == NULL)
                goto unlock;

        if (interval > ENA_METRICS_MAX_SAMPLE_INTERVAL) {
                ena_log(adapter->pdev, ERR,
                    "ENA metrics update interval is out of range - maximum allowed value: %d seconds\n",
                    ENA_METRICS_MAX_SAMPLE_INTERVAL);
                error = EINVAL;
                goto unlock;
        }

        if (interval == 0) {
                ena_log(adapter->pdev, INFO,
                    "ENA metrics update is now turned off\n");
                bzero(&adapter->eni_metrics, sizeof(adapter->eni_metrics));
        } else {
                ena_log(adapter->pdev, INFO,
                    "ENA metrics update interval is set to: %" PRIu16
                    " seconds\n",
                    interval);
        }

        adapter->metrics_sample_interval = interval;

unlock:
        ENA_LOCK_UNLOCK();

        return (0);
}

static int
ena_sysctl_irq_base_cpu(SYSCTL_HANDLER_ARGS)
{
        struct ena_adapter *adapter = arg1;
        int irq_base_cpu = 0;
        int error;

        ENA_LOCK_LOCK();
        if (unlikely(!ENA_FLAG_ISSET(ENA_FLAG_DEVICE_RUNNING, adapter))) {
                error = ENODEV;
                goto unlock;
        }

        error = sysctl_wire_old_buffer(req, sizeof(irq_base_cpu));
        if (error == 0) {
                irq_base_cpu = adapter->irq_cpu_base;
                error = sysctl_handle_int(oidp, &irq_base_cpu, 0, req);
        }
        if (error != 0 || req->newptr == NULL)
                goto unlock;

        if (irq_base_cpu <= ENA_BASE_CPU_UNSPECIFIED) {
                ena_log(adapter->pdev, ERR,
                    "Requested base CPU is less than zero.\n");
                error = EINVAL;
                goto unlock;
        }

        if (irq_base_cpu > mp_ncpus) {
                ena_log(adapter->pdev, INFO,
                    "Requested base CPU is larger than the number of available CPUs. \n");
                error = EINVAL;
                goto unlock;

        }

        if (irq_base_cpu == adapter->irq_cpu_base) {
                ena_log(adapter->pdev, INFO,
                    "Requested IRQ base CPU is equal to current value "
                    "(%d)\n",
                    adapter->irq_cpu_base);
                goto unlock;
        }

        ena_log(adapter->pdev, INFO,
            "Requested new IRQ base CPU: %d, current value: %d\n",
            irq_base_cpu, adapter->irq_cpu_base);

        error = ena_update_base_cpu(adapter, irq_base_cpu);

unlock:
        ENA_LOCK_UNLOCK();

        return (error);
}

static int
ena_sysctl_irq_cpu_stride(SYSCTL_HANDLER_ARGS)
{
        struct ena_adapter *adapter = arg1;
        int32_t irq_cpu_stride = 0;
        int error;

        ENA_LOCK_LOCK();
        if (unlikely(!ENA_FLAG_ISSET(ENA_FLAG_DEVICE_RUNNING, adapter))) {
                error = ENODEV;
                goto unlock;
        }

        error = sysctl_wire_old_buffer(req, sizeof(irq_cpu_stride));
        if (error == 0) {
                irq_cpu_stride = adapter->irq_cpu_stride;
                error = sysctl_handle_int(oidp, &irq_cpu_stride, 0, req);
        }
        if (error != 0 || req->newptr == NULL)
                goto unlock;

        if (irq_cpu_stride < 0) {
                ena_log(adapter->pdev, ERR,
                    "Requested IRQ stride is less than zero.\n");
                error = EINVAL;
                goto unlock;
        }

        if (irq_cpu_stride > mp_ncpus) {
                ena_log(adapter->pdev, INFO,
                    "Warning: Requested IRQ stride is larger than the number of available CPUs.\n");
        }

        if (irq_cpu_stride == adapter->irq_cpu_stride) {
                ena_log(adapter->pdev, INFO,
                    "Requested IRQ CPU stride is equal to current value "
                    "(%u)\n",
                    adapter->irq_cpu_stride);
                goto unlock;
        }

        ena_log(adapter->pdev, INFO,
            "Requested new IRQ CPU stride: %u, current value: %u\n",
            irq_cpu_stride, adapter->irq_cpu_stride);

        error = ena_update_cpu_stride(adapter, irq_cpu_stride);
        if (error != 0)
                goto unlock;

unlock:
        ENA_LOCK_UNLOCK();

        return (error);
}

#ifndef RSS
/*
 * Change the Receive Side Scaling hash key.
 */
static int
ena_sysctl_rss_key(SYSCTL_HANDLER_ARGS)
{
        struct ena_adapter *adapter = arg1;
        struct ena_com_dev *ena_dev = adapter->ena_dev;
        enum ena_admin_hash_functions ena_func;
        char msg[ENA_HASH_KEY_MSG_SIZE];
        char elem[3] = { 0 };
        char *endp;
        u8 rss_key[ENA_HASH_KEY_SIZE];
        int error, i;

        ENA_LOCK_LOCK();
        if (unlikely(!ENA_FLAG_ISSET(ENA_FLAG_DEVICE_RUNNING, adapter))) {
                error = EINVAL;
                goto unlock;
        }

        if (unlikely(!ENA_FLAG_ISSET(ENA_FLAG_RSS_ACTIVE, adapter))) {
                error = ENOTSUP;
                goto unlock;
        }

        error = sysctl_wire_old_buffer(req, sizeof(msg));
        if (error != 0)
                goto unlock;

        error = ena_com_get_hash_function(adapter->ena_dev, &ena_func);
        if (error != 0) {
                device_printf(adapter->pdev, "Cannot get hash function\n");
                goto unlock;
        }

        if (ena_func != ENA_ADMIN_TOEPLITZ) {
                error = EINVAL;
                device_printf(adapter->pdev, "Unsupported hash algorithm\n");
                goto unlock;
        }

        error = ena_rss_get_hash_key(ena_dev, rss_key);
        if (error != 0) {
                device_printf(adapter->pdev, "Cannot get hash key\n");
                goto unlock;
        }

        for (i = 0; i < ENA_HASH_KEY_SIZE; ++i)
                snprintf(&msg[i * 2], 3, "%02x", rss_key[i]);

        error = sysctl_handle_string(oidp, msg, sizeof(msg), req);
        if (error != 0 || req->newptr == NULL)
                goto unlock;

        if (strlen(msg) != sizeof(msg) - 1) {
                error = EINVAL;
                device_printf(adapter->pdev, "Invalid key size\n");
                goto unlock;
        }

        for (i = 0; i < ENA_HASH_KEY_SIZE; ++i) {
                strncpy(elem, &msg[i * 2], 2);
                rss_key[i] = strtol(elem, &endp, 16);

                /* Both hex nibbles in the string must be valid to continue. */
                if (endp == elem || *endp != '\0' || rss_key[i] < 0) {
                        error = EINVAL;
                        device_printf(adapter->pdev,
                            "Invalid key hex value: '%c'\n", *endp);
                        goto unlock;
                }
        }

        error = ena_rss_set_hash(ena_dev, rss_key);
        if (error != 0)
                device_printf(adapter->pdev, "Cannot fill hash key\n");

unlock:
        ENA_LOCK_UNLOCK();

        return (error);
}

/*
 * Change the Receive Side Scaling indirection table.
 *
 * The sysctl entry string consists of one or more `x:y` keypairs, where
 * x stands for the table index and y for its new value.
 * Table indices that don't need to be updated can be omitted from the string
 * and will retain their existing values. If an index is entered more than once,
 * the last value is used.
 *
 * Example:
 * To update two selected indices in the RSS indirection table, e.g. setting
 * index 0 to queue 5 and then index 5 to queue 0, the below command should be
 * used:
 *   sysctl dev.ena.0.rss.indir_table="0:5 5:0"
 */
static int
ena_sysctl_rss_indir_table(SYSCTL_HANDLER_ARGS)
{
        int num_queues, error;
        struct ena_adapter *adapter = arg1;
        struct ena_indir *indir;
        char *msg, *buf, *endp;
        uint32_t idx, value;

        ENA_LOCK_LOCK();
        if (unlikely(!ENA_FLAG_ISSET(ENA_FLAG_DEVICE_RUNNING, adapter))) {
                error = EINVAL;
                goto unlock;
        }

        if (unlikely(!ENA_FLAG_ISSET(ENA_FLAG_RSS_ACTIVE, adapter))) {
                error = ENOTSUP;
                goto unlock;
        }

        indir = adapter->rss_indir;
        msg = indir->sysctl_buf;

        if (unlikely(indir == NULL)) {
                error = ENOTSUP;
                goto unlock;
        }

        error = sysctl_handle_string(oidp, msg, sizeof(indir->sysctl_buf), req);
        if (error != 0 || req->newptr == NULL)
                goto unlock;

        num_queues = adapter->num_io_queues;

        /*
         * This sysctl expects msg to be a list of `x:y` record pairs,
         * where x is the indirection table index and y is its value.
         */
        for (buf = msg; *buf != '\0'; buf = endp) {
                idx = strtol(buf, &endp, 10);

                if (endp == buf || idx < 0) {
                        device_printf(adapter->pdev, "Invalid index: %s\n",
                            buf);
                        error = EINVAL;
                        break;
                }

                if (idx >= ENA_RX_RSS_TABLE_SIZE) {
                        device_printf(adapter->pdev, "Index %d out of range\n",
                            idx);
                        error = ERANGE;
                        break;
                }

                buf = endp;

                if (*buf++ != ':') {
                        device_printf(adapter->pdev, "Missing ':' separator\n");
                        error = EINVAL;
                        break;
                }

                value = strtol(buf, &endp, 10);

                if (endp == buf || value < 0) {
                        device_printf(adapter->pdev, "Invalid value: %s\n",
                            buf);
                        error = EINVAL;
                        break;
                }

                if (value >= num_queues) {
                        device_printf(adapter->pdev, "Value %d out of range\n",
                            value);
                        error = ERANGE;
                        break;
                }

                indir->table[idx] = value;
        }

        if (error != 0) /* Reload indirection table with last good data. */
                ena_rss_indir_get(adapter, indir->table);

        /* At this point msg has been clobbered by sysctl_handle_string. */
        ena_rss_copy_indir_buf(msg, indir->table);

        if (error == 0)
                error = ena_rss_indir_set(adapter, indir->table);

unlock:
        ENA_LOCK_UNLOCK();

        return (error);
}
#endif /* RSS */