freebsd-nq/sys/dev/mlx5/mlx5_en/mlx5_en_ethtool.c

/*-
 * Copyright (c) 2015 Mellanox Technologies. 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 AUTHOR 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 AUTHOR 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.
 *
 * $FreeBSD$
 */

#include "en.h"
#include <net/sff8472.h>

void
mlx5e_create_stats(struct sysctl_ctx_list *ctx,
    struct sysctl_oid_list *parent, const char *buffer,
    const char **desc, unsigned num, u64 * arg)
{
	struct sysctl_oid *node;
	unsigned x;

	sysctl_ctx_init(ctx);

	node = SYSCTL_ADD_NODE(ctx, parent, OID_AUTO,
	    buffer, CTLFLAG_RD, NULL, "Statistics");
	if (node == NULL)
		return;
	for (x = 0; x != num; x++) {
		SYSCTL_ADD_UQUAD(ctx, SYSCTL_CHILDREN(node), OID_AUTO,
		    desc[2 * x], CTLFLAG_RD, arg + x, desc[2 * x + 1]);
	}
}

static void
mlx5e_ethtool_sync_tx_completion_fact(struct mlx5e_priv *priv)
{
	/*
	 * Limit the maximum distance between completion events to
	 * half of the currently set TX queue size.
	 *
	 * The maximum number of queue entries a single IP packet can
	 * consume is given by MLX5_SEND_WQE_MAX_WQEBBS.
	 *
	 * The worst case max value is then given as below:
	 */
	uint64_t max = priv->params_ethtool.tx_queue_size /
	    (2 * MLX5_SEND_WQE_MAX_WQEBBS);

	/*
	 * Update the maximum completion factor value in case the
	 * tx_queue_size field changed. Ensure we don't overflow
	 * 16-bits.
	 */
	if (max < 1)
		max = 1;
	else if (max > 65535)
		max = 65535;
	priv->params_ethtool.tx_completion_fact_max = max;

	/*
	 * Verify that the current TX completion factor is within the
	 * given limits:
	 */
	if (priv->params_ethtool.tx_completion_fact < 1)
		priv->params_ethtool.tx_completion_fact = 1;
	else if (priv->params_ethtool.tx_completion_fact > max)
		priv->params_ethtool.tx_completion_fact = max;
}

#define	MLX5_PARAM_OFFSET(n)				\
    __offsetof(struct mlx5e_priv, params_ethtool.n)

static int
mlx5e_ethtool_handler(SYSCTL_HANDLER_ARGS)
{
	struct mlx5e_priv *priv = arg1;
	uint64_t value;
	int was_opened;
	int error;

	PRIV_LOCK(priv);
	value = priv->params_ethtool.arg[arg2];
	if (req != NULL) {
		error = sysctl_handle_64(oidp, &value, 0, req);
		if (error || req->newptr == NULL ||
		    value == priv->params_ethtool.arg[arg2])
			goto done;

		/* assign new value */
		priv->params_ethtool.arg[arg2] = value;
	} else {
		error = 0;
	}
	/* check if device is gone */
	if (priv->gone) {
		error = ENXIO;
		goto done;
	}
	was_opened = test_bit(MLX5E_STATE_OPENED, &priv->state);

	switch (MLX5_PARAM_OFFSET(arg[arg2])) {
	case MLX5_PARAM_OFFSET(rx_coalesce_usecs):
		/* import RX coal time */
		if (priv->params_ethtool.rx_coalesce_usecs < 1)
			priv->params_ethtool.rx_coalesce_usecs = 0;
		else if (priv->params_ethtool.rx_coalesce_usecs >
		    MLX5E_FLD_MAX(cqc, cq_period)) {
			priv->params_ethtool.rx_coalesce_usecs =
			    MLX5E_FLD_MAX(cqc, cq_period);
		}
		priv->params.rx_cq_moderation_usec =
		    priv->params_ethtool.rx_coalesce_usecs;

		/* check to avoid down and up the network interface */
		if (was_opened)
			error = mlx5e_refresh_channel_params(priv);
		break;

	case MLX5_PARAM_OFFSET(rx_coalesce_pkts):
		/* import RX coal pkts */
		if (priv->params_ethtool.rx_coalesce_pkts < 1)
			priv->params_ethtool.rx_coalesce_pkts = 0;
		else if (priv->params_ethtool.rx_coalesce_pkts >
		    MLX5E_FLD_MAX(cqc, cq_max_count)) {
			priv->params_ethtool.rx_coalesce_pkts =
			    MLX5E_FLD_MAX(cqc, cq_max_count);
		}
		priv->params.rx_cq_moderation_pkts =
		    priv->params_ethtool.rx_coalesce_pkts;

		/* check to avoid down and up the network interface */
		if (was_opened)
			error = mlx5e_refresh_channel_params(priv);
		break;

	case MLX5_PARAM_OFFSET(tx_coalesce_usecs):
		/* import TX coal time */
		if (priv->params_ethtool.tx_coalesce_usecs < 1)
			priv->params_ethtool.tx_coalesce_usecs = 0;
		else if (priv->params_ethtool.tx_coalesce_usecs >
		    MLX5E_FLD_MAX(cqc, cq_period)) {
			priv->params_ethtool.tx_coalesce_usecs =
			    MLX5E_FLD_MAX(cqc, cq_period);
		}
		priv->params.tx_cq_moderation_usec =
		    priv->params_ethtool.tx_coalesce_usecs;

		/* check to avoid down and up the network interface */
		if (was_opened)
			error = mlx5e_refresh_channel_params(priv);
		break;

	case MLX5_PARAM_OFFSET(tx_coalesce_pkts):
		/* import TX coal pkts */
		if (priv->params_ethtool.tx_coalesce_pkts < 1)
			priv->params_ethtool.tx_coalesce_pkts = 0;
		else if (priv->params_ethtool.tx_coalesce_pkts >
		    MLX5E_FLD_MAX(cqc, cq_max_count)) {
			priv->params_ethtool.tx_coalesce_pkts =
			    MLX5E_FLD_MAX(cqc, cq_max_count);
		}
		priv->params.tx_cq_moderation_pkts =
		    priv->params_ethtool.tx_coalesce_pkts;

		/* check to avoid down and up the network interface */
		if (was_opened)
			error = mlx5e_refresh_channel_params(priv);
		break;

	case MLX5_PARAM_OFFSET(tx_queue_size):
		/* network interface must be down */
		if (was_opened)
			mlx5e_close_locked(priv->ifp);

		/* import TX queue size */
		if (priv->params_ethtool.tx_queue_size <
		    (1 << MLX5E_PARAMS_MINIMUM_LOG_SQ_SIZE)) {
			priv->params_ethtool.tx_queue_size =
			    (1 << MLX5E_PARAMS_MINIMUM_LOG_SQ_SIZE);
		} else if (priv->params_ethtool.tx_queue_size >
		    priv->params_ethtool.tx_queue_size_max) {
			priv->params_ethtool.tx_queue_size =
			    priv->params_ethtool.tx_queue_size_max;
		}
		/* store actual TX queue size */
		priv->params.log_sq_size =
		    order_base_2(priv->params_ethtool.tx_queue_size);
		priv->params_ethtool.tx_queue_size =
		    1 << priv->params.log_sq_size;

		/* verify TX completion factor */
		mlx5e_ethtool_sync_tx_completion_fact(priv);

		/* restart network interface, if any */
		if (was_opened)
			mlx5e_open_locked(priv->ifp);
		break;

	case MLX5_PARAM_OFFSET(rx_queue_size):
		/* network interface must be down */
		if (was_opened)
			mlx5e_close_locked(priv->ifp);

		/* import RX queue size */
		if (priv->params_ethtool.rx_queue_size <
		    (1 << MLX5E_PARAMS_MINIMUM_LOG_RQ_SIZE)) {
			priv->params_ethtool.rx_queue_size =
			    (1 << MLX5E_PARAMS_MINIMUM_LOG_RQ_SIZE);
		} else if (priv->params_ethtool.rx_queue_size >
		    priv->params_ethtool.rx_queue_size_max) {
			priv->params_ethtool.rx_queue_size =
			    priv->params_ethtool.rx_queue_size_max;
		}
		/* store actual RX queue size */
		priv->params.log_rq_size =
		    order_base_2(priv->params_ethtool.rx_queue_size);
		priv->params_ethtool.rx_queue_size =
		    1 << priv->params.log_rq_size;

		/* update least number of RX WQEs */
		priv->params.min_rx_wqes = min(
		    priv->params_ethtool.rx_queue_size - 1,
		    MLX5E_PARAMS_DEFAULT_MIN_RX_WQES);

		/* restart network interface, if any */
		if (was_opened)
			mlx5e_open_locked(priv->ifp);
		break;

	case MLX5_PARAM_OFFSET(channels):
		/* network interface must be down */
		if (was_opened)
			mlx5e_close_locked(priv->ifp);

		/* import number of channels */
		if (priv->params_ethtool.channels < 1)
			priv->params_ethtool.channels = 1;
		else if (priv->params_ethtool.channels >
		    (u64) priv->mdev->priv.eq_table.num_comp_vectors) {
			priv->params_ethtool.channels =
			    (u64) priv->mdev->priv.eq_table.num_comp_vectors;
		}
		priv->params.num_channels = priv->params_ethtool.channels;

		/* restart network interface, if any */
		if (was_opened)
			mlx5e_open_locked(priv->ifp);
		break;

	case MLX5_PARAM_OFFSET(rx_coalesce_mode):
		/* network interface must be down */
		if (was_opened)
			mlx5e_close_locked(priv->ifp);

		/* import RX coalesce mode */
		if (priv->params_ethtool.rx_coalesce_mode != 0)
			priv->params_ethtool.rx_coalesce_mode = 1;
		priv->params.rx_cq_moderation_mode =
		    priv->params_ethtool.rx_coalesce_mode;

		/* restart network interface, if any */
		if (was_opened)
			mlx5e_open_locked(priv->ifp);
		break;

	case MLX5_PARAM_OFFSET(tx_coalesce_mode):
		/* network interface must be down */
		if (was_opened)
			mlx5e_close_locked(priv->ifp);

		/* import TX coalesce mode */
		if (priv->params_ethtool.tx_coalesce_mode != 0)
			priv->params_ethtool.tx_coalesce_mode = 1;
		priv->params.tx_cq_moderation_mode =
		    priv->params_ethtool.tx_coalesce_mode;

		/* restart network interface, if any */
		if (was_opened)
			mlx5e_open_locked(priv->ifp);
		break;

	case MLX5_PARAM_OFFSET(hw_lro):
		/* network interface must be down */
		if (was_opened)
			mlx5e_close_locked(priv->ifp);

		/* import HW LRO mode */
		if (priv->params_ethtool.hw_lro != 0) {
			if ((priv->ifp->if_capenable & IFCAP_LRO) &&
			    MLX5_CAP_ETH(priv->mdev, lro_cap)) {
				priv->params.hw_lro_en = 1;
				priv->params_ethtool.hw_lro = 1;
			} else {
				priv->params.hw_lro_en = 0;
				priv->params_ethtool.hw_lro = 0;
				error = EINVAL;

				if_printf(priv->ifp, "Can't enable HW LRO: "
				    "The HW or SW LRO feature is disabled\n");
			}
		} else {
			priv->params.hw_lro_en = 0;
		}
		/* restart network interface, if any */
		if (was_opened)
			mlx5e_open_locked(priv->ifp);
		break;

	case MLX5_PARAM_OFFSET(cqe_zipping):
		/* network interface must be down */
		if (was_opened)
			mlx5e_close_locked(priv->ifp);

		/* import CQE zipping mode */
		if (priv->params_ethtool.cqe_zipping &&
		    MLX5_CAP_GEN(priv->mdev, cqe_compression)) {
			priv->params.cqe_zipping_en = true;
			priv->params_ethtool.cqe_zipping = 1;
		} else {
			priv->params.cqe_zipping_en = false;
			priv->params_ethtool.cqe_zipping = 0;
		}
		/* restart network interface, if any */
		if (was_opened)
			mlx5e_open_locked(priv->ifp);
		break;

	case MLX5_PARAM_OFFSET(tx_completion_fact):
		/* network interface must be down */
		if (was_opened)
			mlx5e_close_locked(priv->ifp);

		/* verify parameter */
		mlx5e_ethtool_sync_tx_completion_fact(priv);

		/* restart network interface, if any */
		if (was_opened)
			mlx5e_open_locked(priv->ifp);
		break;

	default:
		break;
	}
done:
	PRIV_UNLOCK(priv);
	return (error);
}

/*
 * Read the first three bytes of the eeprom in order to get the needed info
 * for the whole reading.
 * Byte 0 - Identifier byte
 * Byte 1 - Revision byte
 * Byte 2 - Status byte
 */
static int
mlx5e_get_eeprom_info(struct mlx5e_priv *priv, struct mlx5e_eeprom *eeprom)
{
	struct mlx5_core_dev *dev = priv->mdev;
	u32 data = 0;
	int size_read = 0;
	int ret;

	ret = mlx5_query_module_num(dev, &eeprom->module_num);
	if (ret) {
		if_printf(priv->ifp, "%s:%d: Failed query module error=%d\n",
		    __func__, __LINE__, ret);
		return (ret);
	}

	/* Read the first three bytes to get Identifier, Revision and Status */
	ret = mlx5_query_eeprom(dev, eeprom->i2c_addr, eeprom->page_num,
	    eeprom->device_addr, MLX5E_EEPROM_INFO_BYTES, eeprom->module_num, &data,
	    &size_read);
	if (ret) {
		if_printf(priv->ifp, "%s:%d: Failed query eeprom module error=0x%x\n",
		    __func__, __LINE__, ret);
		return (ret);
	}

	switch (data & MLX5_EEPROM_IDENTIFIER_BYTE_MASK) {
	case SFF_8024_ID_QSFP:
		eeprom->type = MLX5E_ETH_MODULE_SFF_8436;
		eeprom->len = MLX5E_ETH_MODULE_SFF_8436_LEN;
		break;
	case SFF_8024_ID_QSFPPLUS:
	case SFF_8024_ID_QSFP28:
		if ((data & MLX5_EEPROM_IDENTIFIER_BYTE_MASK) == SFF_8024_ID_QSFP28 ||
		    ((data & MLX5_EEPROM_REVISION_ID_BYTE_MASK) >> 8) >= 0x3) {
			eeprom->type = MLX5E_ETH_MODULE_SFF_8636;
			eeprom->len = MLX5E_ETH_MODULE_SFF_8636_LEN;
		} else {
			eeprom->type = MLX5E_ETH_MODULE_SFF_8436;
			eeprom->len = MLX5E_ETH_MODULE_SFF_8436_LEN;
		}
		if ((data & MLX5_EEPROM_PAGE_3_VALID_BIT_MASK) == 0)
			eeprom->page_valid = 1;
		break;
	case SFF_8024_ID_SFP:
		eeprom->type = MLX5E_ETH_MODULE_SFF_8472;
		eeprom->len = MLX5E_ETH_MODULE_SFF_8472_LEN;
		break;
	default:
		if_printf(priv->ifp, "%s:%d: Not recognized cable type = 0x%x(%s)\n",
		    __func__, __LINE__, data & MLX5_EEPROM_IDENTIFIER_BYTE_MASK,
		    sff_8024_id[data & MLX5_EEPROM_IDENTIFIER_BYTE_MASK]);
		return (EINVAL);
	}
	return (0);
}

/* Read both low and high pages of the eeprom */
static int
mlx5e_get_eeprom(struct mlx5e_priv *priv, struct mlx5e_eeprom *ee)
{
	struct mlx5_core_dev *dev = priv->mdev;
	int size_read = 0;
	int ret;

	if (ee->len == 0)
		return (EINVAL);

	/* Read low page of the eeprom */
	while (ee->device_addr < ee->len) {
		ret = mlx5_query_eeprom(dev, ee->i2c_addr, ee->page_num, ee->device_addr,
		    ee->len - ee->device_addr, ee->module_num,
		    ee->data + (ee->device_addr / 4), &size_read);
		if (ret) {
			if_printf(priv->ifp, "%s:%d: Failed reading eeprom, "
			    "error = 0x%02x\n", __func__, __LINE__, ret);
			return (ret);
		}
		ee->device_addr += size_read;
	}

	/* Read high page of the eeprom */
	if (ee->page_valid) {
		ee->device_addr = MLX5E_EEPROM_HIGH_PAGE_OFFSET;
		ee->page_num = MLX5E_EEPROM_HIGH_PAGE;
		size_read = 0;
		while (ee->device_addr < MLX5E_EEPROM_PAGE_LENGTH) {
			ret = mlx5_query_eeprom(dev, ee->i2c_addr, ee->page_num,
			    ee->device_addr, MLX5E_EEPROM_PAGE_LENGTH - ee->device_addr,
			    ee->module_num, ee->data + (ee->len / 4) +
			    ((ee->device_addr - MLX5E_EEPROM_HIGH_PAGE_OFFSET) / 4),
			    &size_read);
			if (ret) {
				if_printf(priv->ifp, "%s:%d: Failed reading eeprom, "
				    "error = 0x%02x\n", __func__, __LINE__, ret);
				return (ret);
			}
			ee->device_addr += size_read;
		}
	}
	return (0);
}

static void
mlx5e_print_eeprom(struct mlx5e_eeprom *eeprom)
{
	int row;
	int index_in_row;
	int byte_to_write = 0;
	int line_length = 16;

	printf("\nOffset\t\tValues\n");
	printf("------\t\t------");
	while (byte_to_write < eeprom->len) {
		printf("\n0x%04X\t\t", byte_to_write);
		for (index_in_row = 0; index_in_row < line_length; index_in_row++) {
			printf("%02X ", ((u8 *)eeprom->data)[byte_to_write]);
			byte_to_write++;
		}
	}

	if (eeprom->page_valid) {
		row = MLX5E_EEPROM_HIGH_PAGE_OFFSET;
		printf("\n\nUpper Page 0x03\n");
		printf("\nOffset\t\tValues\n");
		printf("------\t\t------");
		while (row < MLX5E_EEPROM_PAGE_LENGTH) {
			printf("\n0x%04X\t\t", row);
			for (index_in_row = 0; index_in_row < line_length; index_in_row++) {
				printf("%02X ", ((u8 *)eeprom->data)[byte_to_write]);
				byte_to_write++;
				row++;
			}
		}
	}
}

/*
 * Read cable EEPROM module information by first inspecting the first
 * three bytes to get the initial information for a whole reading.
 * Information will be printed to dmesg.
 */
static int
mlx5e_read_eeprom(SYSCTL_HANDLER_ARGS)
{
	struct mlx5e_priv *priv = arg1;
	struct mlx5e_eeprom eeprom;
	int error;
	int result = 0;

	PRIV_LOCK(priv);
	error = sysctl_handle_int(oidp, &result, 0, req);
	if (error || !req->newptr)
		goto done;

	/* Check if device is gone */
	if (priv->gone) {
		error = ENXIO;
		goto done;
	}

	if (result == 1) {
		eeprom.i2c_addr = MLX5E_I2C_ADDR_LOW;
		eeprom.device_addr = 0;
		eeprom.page_num = MLX5E_EEPROM_LOW_PAGE;
		eeprom.page_valid = 0;

		/* Read three first bytes to get important info */
		error = mlx5e_get_eeprom_info(priv, &eeprom);
		if (error) {
			if_printf(priv->ifp, "%s:%d: Failed reading eeprom's "
			    "initial information\n", __func__, __LINE__);
			error = 0;
			goto done;
		}
		/*
		 * Allocate needed length buffer and additional space for
		 * page 0x03
		 */
		eeprom.data = malloc(eeprom.len + MLX5E_EEPROM_PAGE_LENGTH,
		    M_MLX5EN, M_WAITOK | M_ZERO);

		/* Read the whole eeprom information */
		error = mlx5e_get_eeprom(priv, &eeprom);
		if (error) {
			if_printf(priv->ifp, "%s:%d: Failed reading eeprom\n",
			    __func__, __LINE__);
			error = 0;
			/*
			 * Continue printing partial information in case of
			 * an error
			 */
		}
		mlx5e_print_eeprom(&eeprom);
		free(eeprom.data, M_MLX5EN);
	}
done:
	PRIV_UNLOCK(priv);
	return (error);
}

static const char *mlx5e_params_desc[] = {
	MLX5E_PARAMS(MLX5E_STATS_DESC)
};

static const char *mlx5e_port_stats_debug_desc[] = {
	MLX5E_PORT_STATS_DEBUG(MLX5E_STATS_DESC)
};

static int
mlx5e_ethtool_debug_stats(SYSCTL_HANDLER_ARGS)
{
	struct mlx5e_priv *priv = arg1;
	int error;
	int sys_debug;

	sys_debug = priv->sysctl_debug;
	error = sysctl_handle_int(oidp, &priv->sysctl_debug, 0, req);
	if (error || !req->newptr)
		return (error);
	priv->sysctl_debug = !!priv->sysctl_debug;
	if (sys_debug == priv->sysctl_debug)
		return (error);
	if (priv->sysctl_debug)
		mlx5e_create_stats(&priv->stats.port_stats_debug.ctx,
		    SYSCTL_CHILDREN(priv->sysctl_ifnet), "debug_stats",
		    mlx5e_port_stats_debug_desc, MLX5E_PORT_STATS_DEBUG_NUM,
		    priv->stats.port_stats_debug.arg);
	else
		sysctl_ctx_free(&priv->stats.port_stats_debug.ctx);
	return (error);
}

void
mlx5e_create_ethtool(struct mlx5e_priv *priv)
{
	struct sysctl_oid *node;
	const char *pnameunit;
	unsigned x;

	/* set some defaults */
	priv->params_ethtool.tx_queue_size_max = 1 << MLX5E_PARAMS_MAXIMUM_LOG_SQ_SIZE;
	priv->params_ethtool.rx_queue_size_max = 1 << MLX5E_PARAMS_MAXIMUM_LOG_RQ_SIZE;
	priv->params_ethtool.tx_queue_size = 1 << priv->params.log_sq_size;
	priv->params_ethtool.rx_queue_size = 1 << priv->params.log_rq_size;
	priv->params_ethtool.channels = priv->params.num_channels;
	priv->params_ethtool.coalesce_pkts_max = MLX5E_FLD_MAX(cqc, cq_max_count);
	priv->params_ethtool.coalesce_usecs_max = MLX5E_FLD_MAX(cqc, cq_period);
	priv->params_ethtool.rx_coalesce_mode = priv->params.rx_cq_moderation_mode;
	priv->params_ethtool.rx_coalesce_usecs = priv->params.rx_cq_moderation_usec;
	priv->params_ethtool.rx_coalesce_pkts = priv->params.rx_cq_moderation_pkts;
	priv->params_ethtool.tx_coalesce_mode = priv->params.tx_cq_moderation_mode;
	priv->params_ethtool.tx_coalesce_usecs = priv->params.tx_cq_moderation_usec;
	priv->params_ethtool.tx_coalesce_pkts = priv->params.tx_cq_moderation_pkts;
	priv->params_ethtool.hw_lro = priv->params.hw_lro_en;
	priv->params_ethtool.cqe_zipping = priv->params.cqe_zipping_en;
	mlx5e_ethtool_sync_tx_completion_fact(priv);

	/* create root node */
	node = SYSCTL_ADD_NODE(&priv->sysctl_ctx,
	    SYSCTL_CHILDREN(priv->sysctl_ifnet), OID_AUTO,
	    "conf", CTLFLAG_RW, NULL, "Configuration");
	if (node == NULL)
		return;
	for (x = 0; x != MLX5E_PARAMS_NUM; x++) {
		/* check for read-only parameter */
		if (strstr(mlx5e_params_desc[2 * x], "_max") != NULL) {
			SYSCTL_ADD_PROC(&priv->sysctl_ctx, SYSCTL_CHILDREN(node), OID_AUTO,
			    mlx5e_params_desc[2 * x], CTLTYPE_U64 | CTLFLAG_RD |
			    CTLFLAG_MPSAFE, priv, x, &mlx5e_ethtool_handler, "QU",
			    mlx5e_params_desc[2 * x + 1]);
		} else {
#if (__FreeBSD_version < 1100000)
			char path[64];
#endif
			/*
			 * NOTE: In FreeBSD-11 and newer the
			 * CTLFLAG_RWTUN flag will take care of
			 * loading default sysctl value from the
			 * kernel environment, if any:
			 */
			SYSCTL_ADD_PROC(&priv->sysctl_ctx, SYSCTL_CHILDREN(node), OID_AUTO,
			    mlx5e_params_desc[2 * x], CTLTYPE_U64 | CTLFLAG_RWTUN |
			    CTLFLAG_MPSAFE, priv, x, &mlx5e_ethtool_handler, "QU",
			    mlx5e_params_desc[2 * x + 1]);

#if (__FreeBSD_version < 1100000)
			/* compute path for sysctl */
			snprintf(path, sizeof(path), "dev.mce.%d.conf.%s",
			    device_get_unit(priv->mdev->pdev->dev.bsddev),
			    mlx5e_params_desc[2 * x]);

			/* try to fetch tunable, if any */
			if (TUNABLE_QUAD_FETCH(path, &priv->params_ethtool.arg[x]))
				mlx5e_ethtool_handler(NULL, priv, x, NULL);
#endif
		}
	}

	SYSCTL_ADD_PROC(&priv->sysctl_ctx, SYSCTL_CHILDREN(node), OID_AUTO,
	    "debug_stats", CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, priv,
	    0, &mlx5e_ethtool_debug_stats, "I", "Extended debug statistics");

	pnameunit = device_get_nameunit(priv->mdev->pdev->dev.bsddev);

	SYSCTL_ADD_STRING(&priv->sysctl_ctx, SYSCTL_CHILDREN(node),
	    OID_AUTO, "device_name", CTLFLAG_RD,
	    __DECONST(void *, pnameunit), 0,
	    "PCI device name");

	/* EEPROM support */
	SYSCTL_ADD_PROC(&priv->sysctl_ctx, SYSCTL_CHILDREN(node), OID_AUTO, "eeprom_info",
	    CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, priv, 0,
	    mlx5e_read_eeprom, "I", "EEPROM information");
}