i40evf: core ethtool functionality

/*******************************************************************************

 *

 * Intel Ethernet Controller XL710 Family Linux Virtual Function Driver

 * Copyright(c) 2013 Intel Corporation.

 *

 * This program is free software; you can redistribute it and/or modify it

 * under the terms and conditions of the GNU General Public License,

 * version 2, as published by the Free Software Foundation.

 *

 * This program is distributed in the hope it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for

 * more details.

 *

 * The full GNU General Public License is included in this distribution in

 * the file called "COPYING".

 *

 * Contact Information:

 * e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>

 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497

 *

 ******************************************************************************/

/* ethtool support for i40evf */

#include "i40evf.h"

#include <linux/uaccess.h>

struct i40evf_stats {

	char stat_string[ETH_GSTRING_LEN];

	int stat_offset;

};

#define I40EVF_STAT(_name, _stat) { \

	.stat_string = _name, \

	.stat_offset = offsetof(struct i40evf_adapter, _stat) \

}

/* All stats are u64, so we don't need to track the size of the field. */

static const struct i40evf_stats i40evf_gstrings_stats[] = {

	I40EVF_STAT("rx_bytes", current_stats.rx_bytes),

	I40EVF_STAT("rx_unicast", current_stats.rx_unicast),

	I40EVF_STAT("rx_multicast", current_stats.rx_multicast),

	I40EVF_STAT("rx_broadcast", current_stats.rx_broadcast),

	I40EVF_STAT("rx_discards", current_stats.rx_discards),

	I40EVF_STAT("rx_errors", current_stats.rx_errors),

	I40EVF_STAT("rx_missed", current_stats.rx_missed),

	I40EVF_STAT("rx_unknown_protocol", current_stats.rx_unknown_protocol),

	I40EVF_STAT("tx_bytes", current_stats.tx_bytes),

	I40EVF_STAT("tx_unicast", current_stats.tx_unicast),

	I40EVF_STAT("tx_multicast", current_stats.tx_multicast),

	I40EVF_STAT("tx_broadcast", current_stats.tx_broadcast),

	I40EVF_STAT("tx_discards", current_stats.tx_discards),

	I40EVF_STAT("tx_errors", current_stats.tx_errors),

};

#define I40EVF_GLOBAL_STATS_LEN ARRAY_SIZE(i40evf_gstrings_stats)

#define I40EVF_QUEUE_STATS_LEN \

	(((struct i40evf_adapter *) \

		netdev_priv(netdev))->vsi_res->num_queue_pairs * 4)

#define I40EVF_STATS_LEN (I40EVF_GLOBAL_STATS_LEN + I40EVF_QUEUE_STATS_LEN)

/**

 * i40evf_get_settings - Get Link Speed and Duplex settings

 * @netdev: network interface device structure

 * @ecmd: ethtool command

 *

 * Reports speed/duplex settings. Because this is a VF, we don't know what

 * kind of link we really have, so we fake it.

 **/

static int i40evf_get_settings(struct net_device *netdev,

			       struct ethtool_cmd *ecmd)

{

	/* In the future the VF will be able to query the PF for

	 * some information - for now use a dummy value

	 */

	ecmd->supported = SUPPORTED_10000baseT_Full;

	ecmd->autoneg = AUTONEG_DISABLE;

	ecmd->transceiver = XCVR_DUMMY1;

	ecmd->port = PORT_NONE;

	return 0;

}

/**

 * i40evf_get_sset_count - Get length of string set

 * @netdev: network interface device structure

 * @sset: id of string set

 *

 * Reports size of string table. This driver only supports

 * strings for statistics.

 **/

static int i40evf_get_sset_count(struct net_device *netdev, int sset)

{

	if (sset == ETH_SS_STATS)

		return I40EVF_STATS_LEN;

	else

		return -ENOTSUPP;

}

/**

 * i40evf_get_ethtool_stats - report device statistics

 * @netdev: network interface device structure

 * @stats: ethtool statistics structure

 * @data: pointer to data buffer

 *

 * All statistics are added to the data buffer as an array of u64.

 **/

static void i40evf_get_ethtool_stats(struct net_device *netdev,

				     struct ethtool_stats *stats, u64 *data)

{

	struct i40evf_adapter *adapter = netdev_priv(netdev);

	int i, j;

	char *p;

	for (i = 0; i < I40EVF_GLOBAL_STATS_LEN; i++) {

		p = (char *)adapter + i40evf_gstrings_stats[i].stat_offset;

		data[i] =  *(u64 *)p;

	}

	for (j = 0; j < adapter->vsi_res->num_queue_pairs; j++) {

		data[i++] = adapter->tx_rings[j]->stats.packets;

		data[i++] = adapter->tx_rings[j]->stats.bytes;

	}

	for (j = 0; j < adapter->vsi_res->num_queue_pairs; j++) {

		data[i++] = adapter->rx_rings[j]->stats.packets;

		data[i++] = adapter->rx_rings[j]->stats.bytes;

	}

}

/**

 * i40evf_get_strings - Get string set

 * @netdev: network interface device structure

 * @sset: id of string set

 * @data: buffer for string data

 *

 * Builds stats string table.

 **/

static void i40evf_get_strings(struct net_device *netdev, u32 sset, u8 *data)

{

	struct i40evf_adapter *adapter = netdev_priv(netdev);

	u8 *p = data;

	int i;

	if (sset == ETH_SS_STATS) {

		for (i = 0; i < I40EVF_GLOBAL_STATS_LEN; i++) {

			memcpy(p, i40evf_gstrings_stats[i].stat_string,

			       ETH_GSTRING_LEN);

			p += ETH_GSTRING_LEN;

		}

		for (i = 0; i < adapter->vsi_res->num_queue_pairs; i++) {

			snprintf(p, ETH_GSTRING_LEN, "tx-%u.packets", i);

			p += ETH_GSTRING_LEN;

			snprintf(p, ETH_GSTRING_LEN, "tx-%u.bytes", i);

			p += ETH_GSTRING_LEN;

		}

		for (i = 0; i < adapter->vsi_res->num_queue_pairs; i++) {

			snprintf(p, ETH_GSTRING_LEN, "rx-%u.packets", i);

			p += ETH_GSTRING_LEN;

			snprintf(p, ETH_GSTRING_LEN, "rx-%u.bytes", i);

			p += ETH_GSTRING_LEN;

		}

	}

}

/**

 * i40evf_get_msglevel - Get debug message level

 * @netdev: network interface device structure

 *

 * Returns current debug message level.

 **/

static u32 i40evf_get_msglevel(struct net_device *netdev)

{

	struct i40evf_adapter *adapter = netdev_priv(netdev);

	return adapter->msg_enable;

}

/**

 * i40evf_get_msglevel - Set debug message level

 * @netdev: network interface device structure

 * @data: message level

 *

 * Set current debug message level. Higher values cause the driver to

 * be noisier.

 **/

static void i40evf_set_msglevel(struct net_device *netdev, u32 data)

{

	struct i40evf_adapter *adapter = netdev_priv(netdev);

	adapter->msg_enable = data;

}

/**

 * i40evf_get_drvinto - Get driver info

 * @netdev: network interface device structure

 * @drvinfo: ethool driver info structure

 *

 * Returns information about the driver and device for display to the user.

 **/

static void i40evf_get_drvinfo(struct net_device *netdev,

			       struct ethtool_drvinfo *drvinfo)

{

	struct i40evf_adapter *adapter = netdev_priv(netdev);

	strlcpy(drvinfo->driver, i40evf_driver_name, 32);

	strlcpy(drvinfo->version, i40evf_driver_version, 32);

	strlcpy(drvinfo->bus_info, pci_name(adapter->pdev), 32);

}

/**

 * i40evf_get_ringparam - Get ring parameters

 * @netdev: network interface device structure

 * @ring: ethtool ringparam structure

 *

 * Returns current ring parameters. TX and RX rings are reported separately,

 * but the number of rings is not reported.

 **/

static void i40evf_get_ringparam(struct net_device *netdev,

				  struct ethtool_ringparam *ring)

{

	struct i40evf_adapter *adapter = netdev_priv(netdev);

	struct i40e_ring *tx_ring = adapter->tx_rings[0];

	struct i40e_ring *rx_ring = adapter->rx_rings[0];

	ring->rx_max_pending = I40EVF_MAX_RXD;

	ring->tx_max_pending = I40EVF_MAX_TXD;

	ring->rx_pending = rx_ring->count;

	ring->tx_pending = tx_ring->count;

}

/**

 * i40evf_set_ringparam - Set ring parameters

 * @netdev: network interface device structure

 * @ring: ethtool ringparam structure

 *

 * Sets ring parameters. TX and RX rings are controlled separately, but the

 * number of rings is not specified, so all rings get the same settings.

 **/

static int i40evf_set_ringparam(struct net_device *netdev,

				struct ethtool_ringparam *ring)

{

	struct i40evf_adapter *adapter = netdev_priv(netdev);

	u32 new_rx_count, new_tx_count;

	if ((ring->rx_mini_pending) || (ring->rx_jumbo_pending))

		return -EINVAL;

	new_tx_count = clamp_t(u32, ring->tx_pending,

			       I40EVF_MIN_TXD,

			       I40EVF_MAX_TXD);

	new_tx_count = ALIGN(new_tx_count, I40EVF_REQ_DESCRIPTOR_MULTIPLE);

	new_rx_count = clamp_t(u32, ring->rx_pending,

			       I40EVF_MIN_RXD,

			       I40EVF_MAX_RXD);

	new_rx_count = ALIGN(new_rx_count, I40EVF_REQ_DESCRIPTOR_MULTIPLE);

	/* if nothing to do return success */

	if ((new_tx_count == adapter->txd_count) &&

	    (new_rx_count == adapter->rxd_count))

		return 0;

	adapter->txd_count = new_tx_count;

	adapter->rxd_count = new_rx_count;

	if (netif_running(netdev))

		i40evf_reinit_locked(adapter);

	return 0;

}

/**

 * i40evf_get_coalesce - Get interrupt coalescing settings

 * @netdev: network interface device structure

 * @ec: ethtool coalesce structure

 *

 * Returns current coalescing settings. This is referred to elsewhere in the

 * driver as Interrupt Throttle Rate, as this is how the hardware describes

 * this functionality.

 **/

static int i40evf_get_coalesce(struct net_device *netdev,

			     struct ethtool_coalesce *ec)

{

	struct i40evf_adapter *adapter = netdev_priv(netdev);

	struct i40e_vsi *vsi = &adapter->vsi;

	ec->tx_max_coalesced_frames = vsi->work_limit;

	ec->rx_max_coalesced_frames = vsi->work_limit;

	if (ITR_IS_DYNAMIC(vsi->rx_itr_setting))

		ec->rx_coalesce_usecs = 1;

	else

		ec->rx_coalesce_usecs = vsi->rx_itr_setting;

	if (ITR_IS_DYNAMIC(vsi->tx_itr_setting))

		ec->tx_coalesce_usecs = 1;

	else

		ec->tx_coalesce_usecs = vsi->tx_itr_setting;

	return 0;

}

/**

 * i40evf_set_coalesce - Set interrupt coalescing settings

 * @netdev: network interface device structure

 * @ec: ethtool coalesce structure

 *

 * Change current coalescing settings.

 **/

static int i40evf_set_coalesce(struct net_device *netdev,

			     struct ethtool_coalesce *ec)

{

	struct i40evf_adapter *adapter = netdev_priv(netdev);

	struct i40e_hw *hw = &adapter->hw;

	struct i40e_vsi *vsi = &adapter->vsi;

	struct i40e_q_vector *q_vector;

	int i;

	if (ec->tx_max_coalesced_frames || ec->rx_max_coalesced_frames)

		vsi->work_limit = ec->tx_max_coalesced_frames;

	switch (ec->rx_coalesce_usecs) {

	case 0:

		vsi->rx_itr_setting = 0;

		break;

	case 1:

		vsi->rx_itr_setting = (I40E_ITR_DYNAMIC

				       | ITR_REG_TO_USEC(I40E_ITR_RX_DEF));

		break;

	default:

		if ((ec->rx_coalesce_usecs < (I40E_MIN_ITR << 1)) ||

		    (ec->rx_coalesce_usecs > (I40E_MAX_ITR << 1)))

			return -EINVAL;

		vsi->rx_itr_setting = ec->rx_coalesce_usecs;

		break;

	}

	switch (ec->tx_coalesce_usecs) {

	case 0:

		vsi->tx_itr_setting = 0;

		break;

	case 1:

		vsi->tx_itr_setting = (I40E_ITR_DYNAMIC

				       | ITR_REG_TO_USEC(I40E_ITR_TX_DEF));

		break;

	default:

		if ((ec->tx_coalesce_usecs < (I40E_MIN_ITR << 1)) ||

		    (ec->tx_coalesce_usecs > (I40E_MAX_ITR << 1)))

			return -EINVAL;

		vsi->tx_itr_setting = ec->tx_coalesce_usecs;

		break;

	}

	for (i = 0; i < adapter->num_msix_vectors - NONQ_VECS; i++) {

		q_vector = adapter->q_vector[i];

		q_vector->rx.itr = ITR_TO_REG(vsi->rx_itr_setting);

		wr32(hw, I40E_VFINT_ITRN1(0, i), q_vector->rx.itr);

		q_vector->tx.itr = ITR_TO_REG(vsi->tx_itr_setting);

		wr32(hw, I40E_VFINT_ITRN1(1, i), q_vector->tx.itr);

		i40e_flush(hw);

	}

	return 0;

}

static struct ethtool_ops i40evf_ethtool_ops = {

	.get_settings		= i40evf_get_settings,

	.get_drvinfo		= i40evf_get_drvinfo,

	.get_link		= ethtool_op_get_link,

	.get_ringparam		= i40evf_get_ringparam,

	.set_ringparam		= i40evf_set_ringparam,

	.get_strings		= i40evf_get_strings,

	.get_ethtool_stats	= i40evf_get_ethtool_stats,

	.get_sset_count		= i40evf_get_sset_count,

	.get_msglevel		= i40evf_get_msglevel,

	.set_msglevel		= i40evf_set_msglevel,

	.get_coalesce		= i40evf_get_coalesce,

	.set_coalesce		= i40evf_set_coalesce,

};

/**

 * i40evf_set_ethtool_ops - Initialize ethtool ops struct

 * @netdev: network interface device structure

 *

 * Sets ethtool ops struct in our netdev so that ethtool can call

 * our functions.

 **/

void i40evf_set_ethtool_ops(struct net_device *netdev)

{

	SET_ETHTOOL_OPS(netdev, &i40evf_ethtool_ops);

}