drivers/net/ethernet/mellanox/mlx4/port.c

/*
 * Copyright (c) 2007 Mellanox Technologies. All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - 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.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include <linux/errno.h>
#include <linux/if_ether.h>
#include <linux/export.h>

#include <linux/mlx4/cmd.h>

#include "mlx4.h"

#define MLX4_MAC_VALID		(1ull << 63)
#define MLX4_MAC_MASK		0xffffffffffffULL

#define MLX4_VLAN_VALID		(1u << 31)
#define MLX4_VLAN_MASK		0xfff

#define MLX4_STATS_TRAFFIC_COUNTERS_MASK	0xfULL
#define MLX4_STATS_TRAFFIC_DROPS_MASK		0xc0ULL
#define MLX4_STATS_ERROR_COUNTERS_MASK		0x1ffc30ULL
#define MLX4_STATS_PORT_COUNTERS_MASK		0x1fe00000ULL

void mlx4_init_mac_table(struct mlx4_dev *dev, struct mlx4_mac_table *table)
{
	int i;

	mutex_init(&table->mutex);
	for (i = 0; i < MLX4_MAX_MAC_NUM; i++) {
		table->entries[i] = 0;
		table->refs[i]	 = 0;
	}
	table->max   = 1 << dev->caps.log_num_macs;
	table->total = 0;
}

void mlx4_init_vlan_table(struct mlx4_dev *dev, struct mlx4_vlan_table *table)
{
	int i;

	mutex_init(&table->mutex);
	for (i = 0; i < MLX4_MAX_VLAN_NUM; i++) {
		table->entries[i] = 0;
		table->refs[i]	 = 0;
	}
	table->max   = (1 << dev->caps.log_num_vlans) - MLX4_VLAN_REGULAR;
	table->total = 0;
}

static int mlx4_uc_steer_add(struct mlx4_dev *dev, u8 port, u64 mac, int *qpn)
{
	struct mlx4_qp qp;
	u8 gid[16] = {0};
	int err;

	qp.qpn = *qpn;

	mac &= 0xffffffffffffULL;
	mac = cpu_to_be64(mac << 16);
	memcpy(&gid[10], &mac, ETH_ALEN);
	gid[5] = port;
	gid[7] = MLX4_UC_STEER << 1;

	err = mlx4_unicast_attach(dev, &qp, gid, 0, MLX4_PROT_ETH);
	if (err)
		mlx4_warn(dev, "Failed Attaching Unicast\n");

	return err;
}

static void mlx4_uc_steer_release(struct mlx4_dev *dev, u8 port,
				  u64 mac, int qpn)
{
	struct mlx4_qp qp;
	u8 gid[16] = {0};

	qp.qpn = qpn;
	mac &= 0xffffffffffffULL;
	mac = cpu_to_be64(mac << 16);
	memcpy(&gid[10], &mac, ETH_ALEN);
	gid[5] = port;
	gid[7] = MLX4_UC_STEER << 1;

	mlx4_unicast_detach(dev, &qp, gid, MLX4_PROT_ETH);
}

static int validate_index(struct mlx4_dev *dev,
			  struct mlx4_mac_table *table, int index)
{
	int err = 0;

	if (index < 0 || index >= table->max || !table->entries[index]) {
		mlx4_warn(dev, "No valid Mac entry for the given index\n");
		err = -EINVAL;
	}
	return err;
}

static int find_index(struct mlx4_dev *dev,
		      struct mlx4_mac_table *table, u64 mac)
{
	int i;

	for (i = 0; i < MLX4_MAX_MAC_NUM; i++) {
		if ((mac & MLX4_MAC_MASK) ==
		    (MLX4_MAC_MASK & be64_to_cpu(table->entries[i])))
			return i;
	}
	/* Mac not found */
	return -EINVAL;
}

int mlx4_get_eth_qp(struct mlx4_dev *dev, u8 port, u64 mac, int *qpn)
{
	struct mlx4_port_info *info = &mlx4_priv(dev)->port[port];
	struct mlx4_mac_entry *entry;
	int index = 0;
	int err = 0;

	mlx4_dbg(dev, "Registering MAC: 0x%llx for adding\n",
			(unsigned long long) mac);
	index = mlx4_register_mac(dev, port, mac);
	if (index < 0) {
		err = index;
		mlx4_err(dev, "Failed adding MAC: 0x%llx\n",
			 (unsigned long long) mac);
		return err;
	}

	if (!(dev->caps.flags & MLX4_DEV_CAP_FLAG_VEP_UC_STEER)) {
		*qpn = info->base_qpn + index;
		return 0;
	}

	err = mlx4_qp_reserve_range(dev, 1, 1, qpn);
	mlx4_dbg(dev, "Reserved qp %d\n", *qpn);
	if (err) {
		mlx4_err(dev, "Failed to reserve qp for mac registration\n");
		goto qp_err;
	}

	err = mlx4_uc_steer_add(dev, port, mac, qpn);
	if (err)
		goto steer_err;

	entry = kmalloc(sizeof *entry, GFP_KERNEL);
	if (!entry) {
		err = -ENOMEM;
		goto alloc_err;
	}
	entry->mac = mac;
	err = radix_tree_insert(&info->mac_tree, *qpn, entry);
	if (err)
		goto insert_err;
	return 0;

insert_err:
	kfree(entry);

alloc_err:
	mlx4_uc_steer_release(dev, port, mac, *qpn);

steer_err:
	mlx4_qp_release_range(dev, *qpn, 1);

qp_err:
	mlx4_unregister_mac(dev, port, mac);
	return err;
}
EXPORT_SYMBOL_GPL(mlx4_get_eth_qp);

void mlx4_put_eth_qp(struct mlx4_dev *dev, u8 port, u64 mac, int qpn)
{
	struct mlx4_port_info *info = &mlx4_priv(dev)->port[port];
	struct mlx4_mac_entry *entry;

	mlx4_dbg(dev, "Registering MAC: 0x%llx for deleting\n",
		 (unsigned long long) mac);
	mlx4_unregister_mac(dev, port, mac);

	if (dev->caps.flags & MLX4_DEV_CAP_FLAG_VEP_UC_STEER) {
		entry = radix_tree_lookup(&info->mac_tree, qpn);
		if (entry) {
			mlx4_dbg(dev, "Releasing qp: port %d, mac 0x%llx,"
				 " qpn %d\n", port,
				 (unsigned long long) mac, qpn);
			mlx4_uc_steer_release(dev, port, entry->mac, qpn);
			mlx4_qp_release_range(dev, qpn, 1);
			radix_tree_delete(&info->mac_tree, qpn);
			kfree(entry);
		}
	}
}
EXPORT_SYMBOL_GPL(mlx4_put_eth_qp);

static int mlx4_set_port_mac_table(struct mlx4_dev *dev, u8 port,
				   __be64 *entries)
{
	struct mlx4_cmd_mailbox *mailbox;
	u32 in_mod;
	int err;

	mailbox = mlx4_alloc_cmd_mailbox(dev);
	if (IS_ERR(mailbox))
		return PTR_ERR(mailbox);

	memcpy(mailbox->buf, entries, MLX4_MAC_TABLE_SIZE);

	in_mod = MLX4_SET_PORT_MAC_TABLE << 8 | port;

	err = mlx4_cmd(dev, mailbox->dma, in_mod, 1, MLX4_CMD_SET_PORT,
		       MLX4_CMD_TIME_CLASS_B, MLX4_CMD_NATIVE);

	mlx4_free_cmd_mailbox(dev, mailbox);
	return err;
}

int __mlx4_register_mac(struct mlx4_dev *dev, u8 port, u64 mac)
{
	struct mlx4_port_info *info = &mlx4_priv(dev)->port[port];
	struct mlx4_mac_table *table = &info->mac_table;
	int i, err = 0;
	int free = -1;

	mlx4_dbg(dev, "Registering MAC: 0x%llx for port %d\n",
		 (unsigned long long) mac, port);

	mutex_lock(&table->mutex);
	for (i = 0; i < MLX4_MAX_MAC_NUM; i++) {
		if (free < 0 && !table->entries[i]) {
			free = i;
			continue;
		}

		if (mac == (MLX4_MAC_MASK & be64_to_cpu(table->entries[i]))) {
			/* MAC already registered, Must not have duplicates */
			err = -EEXIST;
			goto out;
		}
	}

	mlx4_dbg(dev, "Free MAC index is %d\n", free);

	if (table->total == table->max) {
		/* No free mac entries */
		err = -ENOSPC;
		goto out;
	}

	/* Register new MAC */
	table->entries[free] = cpu_to_be64(mac | MLX4_MAC_VALID);

	err = mlx4_set_port_mac_table(dev, port, table->entries);
	if (unlikely(err)) {
		mlx4_err(dev, "Failed adding MAC: 0x%llx\n",
			 (unsigned long long) mac);
		table->entries[free] = 0;
		goto out;
	}

	err = free;
	++table->total;
out:
	mutex_unlock(&table->mutex);
	return err;
}
EXPORT_SYMBOL_GPL(__mlx4_register_mac);

int mlx4_register_mac(struct mlx4_dev *dev, u8 port, u64 mac)
{
	u64 out_param;
	int err;

	if (mlx4_is_mfunc(dev)) {
		set_param_l(&out_param, port);
		err = mlx4_cmd_imm(dev, mac, &out_param, RES_MAC,
				   RES_OP_RESERVE_AND_MAP, MLX4_CMD_ALLOC_RES,
				   MLX4_CMD_TIME_CLASS_A, MLX4_CMD_WRAPPED);
		if (err)
			return err;

		return get_param_l(&out_param);
	}
	return __mlx4_register_mac(dev, port, mac);
}
EXPORT_SYMBOL_GPL(mlx4_register_mac);


void __mlx4_unregister_mac(struct mlx4_dev *dev, u8 port, u64 mac)
{
	struct mlx4_port_info *info = &mlx4_priv(dev)->port[port];
	struct mlx4_mac_table *table = &info->mac_table;
	int index;

	index = find_index(dev, table, mac);

	mutex_lock(&table->mutex);

	if (validate_index(dev, table, index))
		goto out;

	table->entries[index] = 0;
	mlx4_set_port_mac_table(dev, port, table->entries);
	--table->total;
out:
	mutex_unlock(&table->mutex);
}
EXPORT_SYMBOL_GPL(__mlx4_unregister_mac);

void mlx4_unregister_mac(struct mlx4_dev *dev, u8 port, u64 mac)
{
	u64 out_param;
	int err;

	if (mlx4_is_mfunc(dev)) {
		set_param_l(&out_param, port);
		err = mlx4_cmd_imm(dev, mac, &out_param, RES_MAC,
				   RES_OP_RESERVE_AND_MAP, MLX4_CMD_FREE_RES,
				   MLX4_CMD_TIME_CLASS_A, MLX4_CMD_WRAPPED);
		return;
	}
	__mlx4_unregister_mac(dev, port, mac);
	return;
}
EXPORT_SYMBOL_GPL(mlx4_unregister_mac);

int mlx4_replace_mac(struct mlx4_dev *dev, u8 port, int qpn, u64 new_mac)
{
	struct mlx4_port_info *info = &mlx4_priv(dev)->port[port];
	struct mlx4_mac_table *table = &info->mac_table;
	struct mlx4_mac_entry *entry;
	int index = qpn - info->base_qpn;
	int err = 0;

	if (dev->caps.flags & MLX4_DEV_CAP_FLAG_VEP_UC_STEER) {
		entry = radix_tree_lookup(&info->mac_tree, qpn);
		if (!entry)
			return -EINVAL;
		mlx4_uc_steer_release(dev, port, entry->mac, qpn);
		mlx4_unregister_mac(dev, port, entry->mac);
		entry->mac = new_mac;
		mlx4_register_mac(dev, port, new_mac);
		err = mlx4_uc_steer_add(dev, port, entry->mac, &qpn);
		return err;
	}

	/* CX1 doesn't support multi-functions */
	mutex_lock(&table->mutex);

	err = validate_index(dev, table, index);
	if (err)
		goto out;

	table->entries[index] = cpu_to_be64(new_mac | MLX4_MAC_VALID);

	err = mlx4_set_port_mac_table(dev, port, table->entries);
	if (unlikely(err)) {
		mlx4_err(dev, "Failed adding MAC: 0x%llx\n",
			 (unsigned long long) new_mac);
		table->entries[index] = 0;
	}
out:
	mutex_unlock(&table->mutex);
	return err;
}
EXPORT_SYMBOL_GPL(mlx4_replace_mac);

static int mlx4_set_port_vlan_table(struct mlx4_dev *dev, u8 port,
				    __be32 *entries)
{
	struct mlx4_cmd_mailbox *mailbox;
	u32 in_mod;
	int err;

	mailbox = mlx4_alloc_cmd_mailbox(dev);
	if (IS_ERR(mailbox))
		return PTR_ERR(mailbox);

	memcpy(mailbox->buf, entries, MLX4_VLAN_TABLE_SIZE);
	in_mod = MLX4_SET_PORT_VLAN_TABLE << 8 | port;
	err = mlx4_cmd(dev, mailbox->dma, in_mod, 1, MLX4_CMD_SET_PORT,
		       MLX4_CMD_TIME_CLASS_B, MLX4_CMD_WRAPPED);

	mlx4_free_cmd_mailbox(dev, mailbox);

	return err;
}

int mlx4_find_cached_vlan(struct mlx4_dev *dev, u8 port, u16 vid, int *idx)
{
	struct mlx4_vlan_table *table = &mlx4_priv(dev)->port[port].vlan_table;
	int i;

	for (i = 0; i < MLX4_MAX_VLAN_NUM; ++i) {
		if (table->refs[i] &&
		    (vid == (MLX4_VLAN_MASK &
			      be32_to_cpu(table->entries[i])))) {
			/* VLAN already registered, increase reference count */
			*idx = i;
			return 0;
		}
	}

	return -ENOENT;
}
EXPORT_SYMBOL_GPL(mlx4_find_cached_vlan);

static int __mlx4_register_vlan(struct mlx4_dev *dev, u8 port, u16 vlan,
				int *index)
{
	struct mlx4_vlan_table *table = &mlx4_priv(dev)->port[port].vlan_table;
	int i, err = 0;
	int free = -1;

	mutex_lock(&table->mutex);

	if (table->total == table->max) {
		/* No free vlan entries */
		err = -ENOSPC;
		goto out;
	}

	for (i = MLX4_VLAN_REGULAR; i < MLX4_MAX_VLAN_NUM; i++) {
		if (free < 0 && (table->refs[i] == 0)) {
			free = i;
			continue;
		}

		if (table->refs[i] &&
		    (vlan == (MLX4_VLAN_MASK &
			      be32_to_cpu(table->entries[i])))) {
			/* Vlan already registered, increase references count */
			*index = i;
			++table->refs[i];
			goto out;
		}
	}

	if (free < 0) {
		err = -ENOMEM;
		goto out;
	}

	/* Register new VLAN */
	table->refs[free] = 1;
	table->entries[free] = cpu_to_be32(vlan | MLX4_VLAN_VALID);

	err = mlx4_set_port_vlan_table(dev, port, table->entries);
	if (unlikely(err)) {
		mlx4_warn(dev, "Failed adding vlan: %u\n", vlan);
		table->refs[free] = 0;
		table->entries[free] = 0;
		goto out;
	}

	*index = free;
	++table->total;
out:
	mutex_unlock(&table->mutex);
	return err;
}

int mlx4_register_vlan(struct mlx4_dev *dev, u8 port, u16 vlan, int *index)
{
	u64 out_param;
	int err;

	if (mlx4_is_mfunc(dev)) {
		set_param_l(&out_param, port);
		err = mlx4_cmd_imm(dev, vlan, &out_param, RES_VLAN,
				   RES_OP_RESERVE_AND_MAP, MLX4_CMD_ALLOC_RES,
				   MLX4_CMD_TIME_CLASS_A, MLX4_CMD_WRAPPED);
		if (!err)
			*index = get_param_l(&out_param);

		return err;
	}
	return __mlx4_register_vlan(dev, port, vlan, index);
}
EXPORT_SYMBOL_GPL(mlx4_register_vlan);

static void __mlx4_unregister_vlan(struct mlx4_dev *dev, u8 port, int index)
{
	struct mlx4_vlan_table *table = &mlx4_priv(dev)->port[port].vlan_table;

	if (index < MLX4_VLAN_REGULAR) {
		mlx4_warn(dev, "Trying to free special vlan index %d\n", index);
		return;
	}

	mutex_lock(&table->mutex);
	if (!table->refs[index]) {
		mlx4_warn(dev, "No vlan entry for index %d\n", index);
		goto out;
	}
	if (--table->refs[index]) {
		mlx4_dbg(dev, "Have more references for index %d,"
			 "no need to modify vlan table\n", index);
		goto out;
	}
	table->entries[index] = 0;
	mlx4_set_port_vlan_table(dev, port, table->entries);
	--table->total;
out:
	mutex_unlock(&table->mutex);
}

void mlx4_unregister_vlan(struct mlx4_dev *dev, u8 port, int index)
{
	u64 in_param;
	int err;

	if (mlx4_is_mfunc(dev)) {
		set_param_l(&in_param, port);
		err = mlx4_cmd(dev, in_param, RES_VLAN, RES_OP_RESERVE_AND_MAP,
			       MLX4_CMD_FREE_RES, MLX4_CMD_TIME_CLASS_A,
			       MLX4_CMD_WRAPPED);
		if (!err)
			mlx4_warn(dev, "Failed freeing vlan at index:%d\n",
					index);

		return;
	}
	__mlx4_unregister_vlan(dev, port, index);
}
EXPORT_SYMBOL_GPL(mlx4_unregister_vlan);

int mlx4_get_port_ib_caps(struct mlx4_dev *dev, u8 port, __be32 *caps)
{
	struct mlx4_cmd_mailbox *inmailbox, *outmailbox;
	u8 *inbuf, *outbuf;
	int err;

	inmailbox = mlx4_alloc_cmd_mailbox(dev);
	if (IS_ERR(inmailbox))
		return PTR_ERR(inmailbox);

	outmailbox = mlx4_alloc_cmd_mailbox(dev);
	if (IS_ERR(outmailbox)) {
		mlx4_free_cmd_mailbox(dev, inmailbox);
		return PTR_ERR(outmailbox);
	}

	inbuf = inmailbox->buf;
	outbuf = outmailbox->buf;
	memset(inbuf, 0, 256);
	memset(outbuf, 0, 256);
	inbuf[0] = 1;
	inbuf[1] = 1;
	inbuf[2] = 1;
	inbuf[3] = 1;
	*(__be16 *) (&inbuf[16]) = cpu_to_be16(0x0015);
	*(__be32 *) (&inbuf[20]) = cpu_to_be32(port);

	err = mlx4_cmd_box(dev, inmailbox->dma, outmailbox->dma, port, 3,
			   MLX4_CMD_MAD_IFC, MLX4_CMD_TIME_CLASS_C,
			   MLX4_CMD_NATIVE);
	if (!err)
		*caps = *(__be32 *) (outbuf + 84);
	mlx4_free_cmd_mailbox(dev, inmailbox);
	mlx4_free_cmd_mailbox(dev, outmailbox);
	return err;
}

int mlx4_check_ext_port_caps(struct mlx4_dev *dev, u8 port)
{
	struct mlx4_cmd_mailbox *inmailbox, *outmailbox;
	u8 *inbuf, *outbuf;
	int err, packet_error;

	inmailbox = mlx4_alloc_cmd_mailbox(dev);
	if (IS_ERR(inmailbox))
		return PTR_ERR(inmailbox);

	outmailbox = mlx4_alloc_cmd_mailbox(dev);
	if (IS_ERR(outmailbox)) {
		mlx4_free_cmd_mailbox(dev, inmailbox);
		return PTR_ERR(outmailbox);
	}

	inbuf = inmailbox->buf;
	outbuf = outmailbox->buf;
	memset(inbuf, 0, 256);
	memset(outbuf, 0, 256);
	inbuf[0] = 1;
	inbuf[1] = 1;
	inbuf[2] = 1;
	inbuf[3] = 1;

	*(__be16 *) (&inbuf[16]) = MLX4_ATTR_EXTENDED_PORT_INFO;
	*(__be32 *) (&inbuf[20]) = cpu_to_be32(port);

	err = mlx4_cmd_box(dev, inmailbox->dma, outmailbox->dma, port, 3,
			   MLX4_CMD_MAD_IFC, MLX4_CMD_TIME_CLASS_C,
			   MLX4_CMD_NATIVE);

	packet_error = be16_to_cpu(*(__be16 *) (outbuf + 4));

	dev->caps.ext_port_cap[port] = (!err && !packet_error) ?
				       MLX_EXT_PORT_CAP_FLAG_EXTENDED_PORT_INFO
				       : 0;

	mlx4_free_cmd_mailbox(dev, inmailbox);
	mlx4_free_cmd_mailbox(dev, outmailbox);
	return err;
}

static int mlx4_common_set_port(struct mlx4_dev *dev, int slave, u32 in_mod,
				u8 op_mod, struct mlx4_cmd_mailbox *inbox)
{
	struct mlx4_priv *priv = mlx4_priv(dev);
	struct mlx4_port_info *port_info;
	struct mlx4_mfunc_master_ctx *master = &priv->mfunc.master;
	struct mlx4_slave_state *slave_st = &master->slave_state[slave];
	struct mlx4_set_port_rqp_calc_context *qpn_context;
	struct mlx4_set_port_general_context *gen_context;
	int reset_qkey_viols;
	int port;
	int is_eth;
	u32 in_modifier;
	u32 promisc;
	u16 mtu, prev_mtu;
	int err;
	int i;
	__be32 agg_cap_mask;
	__be32 slave_cap_mask;
	__be32 new_cap_mask;

	port = in_mod & 0xff;
	in_modifier = in_mod >> 8;
	is_eth = op_mod;
	port_info = &priv->port[port];

	/* Slaves cannot perform SET_PORT operations except changing MTU */
	if (is_eth) {
		if (slave != dev->caps.function &&
		    in_modifier != MLX4_SET_PORT_GENERAL) {
			mlx4_warn(dev, "denying SET_PORT for slave:%d\n",
					slave);
			return -EINVAL;
		}
		switch (in_modifier) {
		case MLX4_SET_PORT_RQP_CALC:
			qpn_context = inbox->buf;
			qpn_context->base_qpn =
				cpu_to_be32(port_info->base_qpn);
			qpn_context->n_mac = 0x7;
			promisc = be32_to_cpu(qpn_context->promisc) >>
				SET_PORT_PROMISC_SHIFT;
			qpn_context->promisc = cpu_to_be32(
				promisc << SET_PORT_PROMISC_SHIFT |
				port_info->base_qpn);
			promisc = be32_to_cpu(qpn_context->mcast) >>
				SET_PORT_MC_PROMISC_SHIFT;
			qpn_context->mcast = cpu_to_be32(
				promisc << SET_PORT_MC_PROMISC_SHIFT |
				port_info->base_qpn);
			break;
		case MLX4_SET_PORT_GENERAL:
			gen_context = inbox->buf;
			/* Mtu is configured as the max MTU among all the
			 * the functions on the port. */
			mtu = be16_to_cpu(gen_context->mtu);
			mtu = min_t(int, mtu, dev->caps.eth_mtu_cap[port]);
			prev_mtu = slave_st->mtu[port];
			slave_st->mtu[port] = mtu;
			if (mtu > master->max_mtu[port])
				master->max_mtu[port] = mtu;
			if (mtu < prev_mtu && prev_mtu ==
						master->max_mtu[port]) {
				slave_st->mtu[port] = mtu;
				master->max_mtu[port] = mtu;
				for (i = 0; i < dev->num_slaves; i++) {
					master->max_mtu[port] =
					max(master->max_mtu[port],
					    master->slave_state[i].mtu[port]);
				}
			}

			gen_context->mtu = cpu_to_be16(master->max_mtu[port]);
			break;
		}
		return mlx4_cmd(dev, inbox->dma, in_mod, op_mod,
				MLX4_CMD_SET_PORT, MLX4_CMD_TIME_CLASS_B,
				MLX4_CMD_NATIVE);
	}

	/* For IB, we only consider:
	 * - The capability mask, which is set to the aggregate of all
	 *   slave function capabilities
	 * - The QKey violatin counter - reset according to each request.
	 */

	if (dev->flags & MLX4_FLAG_OLD_PORT_CMDS) {
		reset_qkey_viols = (*(u8 *) inbox->buf) & 0x40;
		new_cap_mask = ((__be32 *) inbox->buf)[2];
	} else {
		reset_qkey_viols = ((u8 *) inbox->buf)[3] & 0x1;
		new_cap_mask = ((__be32 *) inbox->buf)[1];
	}

	agg_cap_mask = 0;
	slave_cap_mask =
		priv->mfunc.master.slave_state[slave].ib_cap_mask[port];
	priv->mfunc.master.slave_state[slave].ib_cap_mask[port] = new_cap_mask;
	for (i = 0; i < dev->num_slaves; i++)
		agg_cap_mask |=
			priv->mfunc.master.slave_state[i].ib_cap_mask[port];

	/* only clear mailbox for guests.  Master may be setting
	* MTU or PKEY table size
	*/
	if (slave != dev->caps.function)
		memset(inbox->buf, 0, 256);
	if (dev->flags & MLX4_FLAG_OLD_PORT_CMDS) {
		*(u8 *) inbox->buf	   = !!reset_qkey_viols << 6;
		((__be32 *) inbox->buf)[2] = agg_cap_mask;
	} else {
		((u8 *) inbox->buf)[3]     = !!reset_qkey_viols;
		((__be32 *) inbox->buf)[1] = agg_cap_mask;
	}

	err = mlx4_cmd(dev, inbox->dma, port, is_eth, MLX4_CMD_SET_PORT,
		       MLX4_CMD_TIME_CLASS_B, MLX4_CMD_NATIVE);
	if (err)
		priv->mfunc.master.slave_state[slave].ib_cap_mask[port] =
			slave_cap_mask;
	return err;
}

int mlx4_SET_PORT_wrapper(struct mlx4_dev *dev, int slave,
			  struct mlx4_vhcr *vhcr,
			  struct mlx4_cmd_mailbox *inbox,
			  struct mlx4_cmd_mailbox *outbox,
			  struct mlx4_cmd_info *cmd)
{
	return mlx4_common_set_port(dev, slave, vhcr->in_modifier,
				    vhcr->op_modifier, inbox);
}

/* bit locations for set port command with zero op modifier */
enum {
	MLX4_SET_PORT_VL_CAP	 = 4, /* bits 7:4 */
	MLX4_SET_PORT_MTU_CAP	 = 12, /* bits 15:12 */
	MLX4_CHANGE_PORT_VL_CAP	 = 21,
	MLX4_CHANGE_PORT_MTU_CAP = 22,
};

int mlx4_SET_PORT(struct mlx4_dev *dev, u8 port)
{
	struct mlx4_cmd_mailbox *mailbox;
	int err, vl_cap;

	if (dev->caps.port_type[port] == MLX4_PORT_TYPE_ETH)
		return 0;

	mailbox = mlx4_alloc_cmd_mailbox(dev);
	if (IS_ERR(mailbox))
		return PTR_ERR(mailbox);

	memset(mailbox->buf, 0, 256);

	((__be32 *) mailbox->buf)[1] = dev->caps.ib_port_def_cap[port];

	/* IB VL CAP enum isn't used by the firmware, just numerical values */
	for (vl_cap = 8; vl_cap >= 1; vl_cap >>= 1) {
		((__be32 *) mailbox->buf)[0] = cpu_to_be32(
			(1 << MLX4_CHANGE_PORT_MTU_CAP) |
			(1 << MLX4_CHANGE_PORT_VL_CAP)  |
			(dev->caps.port_ib_mtu[port] << MLX4_SET_PORT_MTU_CAP) |
			(vl_cap << MLX4_SET_PORT_VL_CAP));
		err = mlx4_cmd(dev, mailbox->dma, port, 0, MLX4_CMD_SET_PORT,
				MLX4_CMD_TIME_CLASS_B, MLX4_CMD_WRAPPED);
		if (err != -ENOMEM)
			break;
	}

	mlx4_free_cmd_mailbox(dev, mailbox);
	return err;
}

int mlx4_SET_PORT_general(struct mlx4_dev *dev, u8 port, int mtu,
			  u8 pptx, u8 pfctx, u8 pprx, u8 pfcrx)
{
	struct mlx4_cmd_mailbox *mailbox;
	struct mlx4_set_port_general_context *context;
	int err;
	u32 in_mod;

	mailbox = mlx4_alloc_cmd_mailbox(dev);
	if (IS_ERR(mailbox))
		return PTR_ERR(mailbox);
	context = mailbox->buf;
	memset(context, 0, sizeof *context);

	context->flags = SET_PORT_GEN_ALL_VALID;
	context->mtu = cpu_to_be16(mtu);
	context->pptx = (pptx * (!pfctx)) << 7;
	context->pfctx = pfctx;
	context->pprx = (pprx * (!pfcrx)) << 7;
	context->pfcrx = pfcrx;

	in_mod = MLX4_SET_PORT_GENERAL << 8 | port;
	err = mlx4_cmd(dev, mailbox->dma, in_mod, 1, MLX4_CMD_SET_PORT,
		       MLX4_CMD_TIME_CLASS_B,  MLX4_CMD_WRAPPED);

	mlx4_free_cmd_mailbox(dev, mailbox);
	return err;
}
EXPORT_SYMBOL(mlx4_SET_PORT_general);

int mlx4_SET_PORT_qpn_calc(struct mlx4_dev *dev, u8 port, u32 base_qpn,
			   u8 promisc)
{
	struct mlx4_cmd_mailbox *mailbox;
	struct mlx4_set_port_rqp_calc_context *context;
	int err;
	u32 in_mod;
	u32 m_promisc = (dev->caps.flags & MLX4_DEV_CAP_FLAG_VEP_MC_STEER) ?
		MCAST_DIRECT : MCAST_DEFAULT;

	if (dev->caps.flags & MLX4_DEV_CAP_FLAG_VEP_MC_STEER  &&
	    dev->caps.flags & MLX4_DEV_CAP_FLAG_VEP_UC_STEER)
		return 0;

	mailbox = mlx4_alloc_cmd_mailbox(dev);
	if (IS_ERR(mailbox))
		return PTR_ERR(mailbox);
	context = mailbox->buf;
	memset(context, 0, sizeof *context);

	context->base_qpn = cpu_to_be32(base_qpn);
	context->n_mac = dev->caps.log_num_macs;
	context->promisc = cpu_to_be32(promisc << SET_PORT_PROMISC_SHIFT |
				       base_qpn);
	context->mcast = cpu_to_be32(m_promisc << SET_PORT_MC_PROMISC_SHIFT |
				     base_qpn);
	context->intra_no_vlan = 0;
	context->no_vlan = MLX4_NO_VLAN_IDX;
	context->intra_vlan_miss = 0;
	context->vlan_miss = MLX4_VLAN_MISS_IDX;

	in_mod = MLX4_SET_PORT_RQP_CALC << 8 | port;
	err = mlx4_cmd(dev, mailbox->dma, in_mod, 1, MLX4_CMD_SET_PORT,
		       MLX4_CMD_TIME_CLASS_B,  MLX4_CMD_WRAPPED);

	mlx4_free_cmd_mailbox(dev, mailbox);
	return err;
}
EXPORT_SYMBOL(mlx4_SET_PORT_qpn_calc);

int mlx4_SET_MCAST_FLTR_wrapper(struct mlx4_dev *dev, int slave,
				struct mlx4_vhcr *vhcr,
				struct mlx4_cmd_mailbox *inbox,
				struct mlx4_cmd_mailbox *outbox,
				struct mlx4_cmd_info *cmd)
{
	int err = 0;

	return err;
}

int mlx4_SET_MCAST_FLTR(struct mlx4_dev *dev, u8 port,
			u64 mac, u64 clear, u8 mode)
{
	return mlx4_cmd(dev, (mac | (clear << 63)), port, mode,
			MLX4_CMD_SET_MCAST_FLTR, MLX4_CMD_TIME_CLASS_B,
			MLX4_CMD_WRAPPED);
}
EXPORT_SYMBOL(mlx4_SET_MCAST_FLTR);

int mlx4_SET_VLAN_FLTR_wrapper(struct mlx4_dev *dev, int slave,
			       struct mlx4_vhcr *vhcr,
			       struct mlx4_cmd_mailbox *inbox,
			       struct mlx4_cmd_mailbox *outbox,
			       struct mlx4_cmd_info *cmd)
{
	int err = 0;

	return err;
}

int mlx4_common_dump_eth_stats(struct mlx4_dev *dev, int slave,
			       u32 in_mod, struct mlx4_cmd_mailbox *outbox)
{
	return mlx4_cmd_box(dev, 0, outbox->dma, in_mod, 0,
			    MLX4_CMD_DUMP_ETH_STATS, MLX4_CMD_TIME_CLASS_B,
			    MLX4_CMD_NATIVE);
}

int mlx4_DUMP_ETH_STATS_wrapper(struct mlx4_dev *dev, int slave,
				struct mlx4_vhcr *vhcr,
				struct mlx4_cmd_mailbox *inbox,
				struct mlx4_cmd_mailbox *outbox,
				struct mlx4_cmd_info *cmd)
{
	if (slave != dev->caps.function)
		return 0;
	return mlx4_common_dump_eth_stats(dev, slave,
					  vhcr->in_modifier, outbox);
}

void mlx4_set_stats_bitmap(struct mlx4_dev *dev, u64 *stats_bitmap)
{
	if (!mlx4_is_mfunc(dev)) {
		*stats_bitmap = 0;
		return;
	}

	*stats_bitmap = (MLX4_STATS_TRAFFIC_COUNTERS_MASK |
			 MLX4_STATS_TRAFFIC_DROPS_MASK |
			 MLX4_STATS_PORT_COUNTERS_MASK);

	if (mlx4_is_master(dev))
		*stats_bitmap |= MLX4_STATS_ERROR_COUNTERS_MASK;
}
EXPORT_SYMBOL(mlx4_set_stats_bitmap);