Merge branch 'fix/hda' into topic/hda

[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / net / mlx4 / en_netdev.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/etherdevice.h>
#include <linux/tcp.h>
#include <linux/if_vlan.h>
#include <linux/delay.h>

#include <linux/mlx4/driver.h>
#include <linux/mlx4/device.h>
#include <linux/mlx4/cmd.h>
#include <linux/mlx4/cq.h>

#include "mlx4_en.h"
#include "en_port.h"


static void mlx4_en_vlan_rx_register(struct net_device *dev, struct vlan_group *grp)
{
        struct mlx4_en_priv *priv = netdev_priv(dev);
        struct mlx4_en_dev *mdev = priv->mdev;
        int err;

        en_dbg(HW, priv, "Registering VLAN group:%p\n", grp);
        priv->vlgrp = grp;

        mutex_lock(&mdev->state_lock);
        if (mdev->device_up && priv->port_up) {
                err = mlx4_SET_VLAN_FLTR(mdev->dev, priv->port, grp);
                if (err)
                        en_err(priv, "Failed configuring VLAN filter\n");
        }
        mutex_unlock(&mdev->state_lock);
}

static void mlx4_en_vlan_rx_add_vid(struct net_device *dev, unsigned short vid)
{
        struct mlx4_en_priv *priv = netdev_priv(dev);
        struct mlx4_en_dev *mdev = priv->mdev;
        int err;

        if (!priv->vlgrp)
                return;

        en_dbg(HW, priv, "adding VLAN:%d (vlgrp entry:%p)\n",
               vid, vlan_group_get_device(priv->vlgrp, vid));

        /* Add VID to port VLAN filter */
        mutex_lock(&mdev->state_lock);
        if (mdev->device_up && priv->port_up) {
                err = mlx4_SET_VLAN_FLTR(mdev->dev, priv->port, priv->vlgrp);
                if (err)
                        en_err(priv, "Failed configuring VLAN filter\n");
        }
        mutex_unlock(&mdev->state_lock);
}

static void mlx4_en_vlan_rx_kill_vid(struct net_device *dev, unsigned short vid)
{
        struct mlx4_en_priv *priv = netdev_priv(dev);
        struct mlx4_en_dev *mdev = priv->mdev;
        int err;

        if (!priv->vlgrp)
                return;

        en_dbg(HW, priv, "Killing VID:%d (vlgrp:%p vlgrp entry:%p)\n",
               vid, priv->vlgrp, vlan_group_get_device(priv->vlgrp, vid));
        vlan_group_set_device(priv->vlgrp, vid, NULL);

        /* Remove VID from port VLAN filter */
        mutex_lock(&mdev->state_lock);
        if (mdev->device_up && priv->port_up) {
                err = mlx4_SET_VLAN_FLTR(mdev->dev, priv->port, priv->vlgrp);
                if (err)
                        en_err(priv, "Failed configuring VLAN filter\n");
        }
        mutex_unlock(&mdev->state_lock);
}

static u64 mlx4_en_mac_to_u64(u8 *addr)
{
        u64 mac = 0;
        int i;

        for (i = 0; i < ETH_ALEN; i++) {
                mac <<= 8;
                mac |= addr[i];
        }
        return mac;
}

static int mlx4_en_set_mac(struct net_device *dev, void *addr)
{
        struct mlx4_en_priv *priv = netdev_priv(dev);
        struct mlx4_en_dev *mdev = priv->mdev;
        struct sockaddr *saddr = addr;

        if (!is_valid_ether_addr(saddr->sa_data))
                return -EADDRNOTAVAIL;

        memcpy(dev->dev_addr, saddr->sa_data, ETH_ALEN);
        priv->mac = mlx4_en_mac_to_u64(dev->dev_addr);
        queue_work(mdev->workqueue, &priv->mac_task);
        return 0;
}

static void mlx4_en_do_set_mac(struct work_struct *work)
{
        struct mlx4_en_priv *priv = container_of(work, struct mlx4_en_priv,
                                                 mac_task);
        struct mlx4_en_dev *mdev = priv->mdev;
        int err = 0;

        mutex_lock(&mdev->state_lock);
        if (priv->port_up) {
                /* Remove old MAC and insert the new one */
                mlx4_unregister_mac(mdev->dev, priv->port, priv->mac_index);
                err = mlx4_register_mac(mdev->dev, priv->port,
                                        priv->mac, &priv->mac_index);
                if (err)
                        en_err(priv, "Failed changing HW MAC address\n");
        } else
                en_dbg(HW, priv, "Port is down while "
                                 "registering mac, exiting...\n");

        mutex_unlock(&mdev->state_lock);
}

static void mlx4_en_clear_list(struct net_device *dev)
{
        struct mlx4_en_priv *priv = netdev_priv(dev);
        struct dev_mc_list *plist = priv->mc_list;
        struct dev_mc_list *next;

        while (plist) {
                next = plist->next;
                kfree(plist);
                plist = next;
        }
        priv->mc_list = NULL;
}

static void mlx4_en_cache_mclist(struct net_device *dev)
{
        struct mlx4_en_priv *priv = netdev_priv(dev);
        struct dev_mc_list *mclist;
        struct dev_mc_list *tmp;
        struct dev_mc_list *plist = NULL;

        for (mclist = dev->mc_list; mclist; mclist = mclist->next) {
                tmp = kmalloc(sizeof(struct dev_mc_list), GFP_ATOMIC);
                if (!tmp) {
                        en_err(priv, "failed to allocate multicast list\n");
                        mlx4_en_clear_list(dev);
                        return;
                }
                memcpy(tmp, mclist, sizeof(struct dev_mc_list));
                tmp->next = NULL;
                if (plist)
                        plist->next = tmp;
                else
                        priv->mc_list = tmp;
                plist = tmp;
        }
}


static void mlx4_en_set_multicast(struct net_device *dev)
{
        struct mlx4_en_priv *priv = netdev_priv(dev);

        if (!priv->port_up)
                return;

        queue_work(priv->mdev->workqueue, &priv->mcast_task);
}

static void mlx4_en_do_set_multicast(struct work_struct *work)
{
        struct mlx4_en_priv *priv = container_of(work, struct mlx4_en_priv,
                                                 mcast_task);
        struct mlx4_en_dev *mdev = priv->mdev;
        struct net_device *dev = priv->dev;
        struct dev_mc_list *mclist;
        u64 mcast_addr = 0;
        int err;

        mutex_lock(&mdev->state_lock);
        if (!mdev->device_up) {
                en_dbg(HW, priv, "Card is not up, "
                                 "ignoring multicast change.\n");
                goto out;
        }
        if (!priv->port_up) {
                en_dbg(HW, priv, "Port is down, "
                                 "ignoring  multicast change.\n");
                goto out;
        }

        /*
         * Promsicuous mode: disable all filters
         */

        if (dev->flags & IFF_PROMISC) {
                if (!(priv->flags & MLX4_EN_FLAG_PROMISC)) {
                        if (netif_msg_rx_status(priv))
                                en_warn(priv, "Entering promiscuous mode\n");
                        priv->flags |= MLX4_EN_FLAG_PROMISC;

                        /* Enable promiscouos mode */
                        err = mlx4_SET_PORT_qpn_calc(mdev->dev, priv->port,
                                                     priv->base_qpn, 1);
                        if (err)
                                en_err(priv, "Failed enabling "
                                             "promiscous mode\n");

                        /* Disable port multicast filter (unconditionally) */
                        err = mlx4_SET_MCAST_FLTR(mdev->dev, priv->port, 0,
                                                  0, MLX4_MCAST_DISABLE);
                        if (err)
                                en_err(priv, "Failed disabling "
                                             "multicast filter\n");

                        /* Disable port VLAN filter */
                        err = mlx4_SET_VLAN_FLTR(mdev->dev, priv->port, NULL);
                        if (err)
                                en_err(priv, "Failed disabling VLAN filter\n");
                }
                goto out;
        }

        /*
         * Not in promiscous mode
         */

        if (priv->flags & MLX4_EN_FLAG_PROMISC) {
                if (netif_msg_rx_status(priv))
                        en_warn(priv, "Leaving promiscuous mode\n");
                priv->flags &= ~MLX4_EN_FLAG_PROMISC;

                /* Disable promiscouos mode */
                err = mlx4_SET_PORT_qpn_calc(mdev->dev, priv->port,
                                             priv->base_qpn, 0);
                if (err)
                        en_err(priv, "Failed disabling promiscous mode\n");

                /* Enable port VLAN filter */
                err = mlx4_SET_VLAN_FLTR(mdev->dev, priv->port, priv->vlgrp);
                if (err)
                        en_err(priv, "Failed enabling VLAN filter\n");
        }

        /* Enable/disable the multicast filter according to IFF_ALLMULTI */
        if (dev->flags & IFF_ALLMULTI) {
                err = mlx4_SET_MCAST_FLTR(mdev->dev, priv->port, 0,
                                          0, MLX4_MCAST_DISABLE);
                if (err)
                        en_err(priv, "Failed disabling multicast filter\n");
        } else {
                err = mlx4_SET_MCAST_FLTR(mdev->dev, priv->port, 0,
                                          0, MLX4_MCAST_DISABLE);
                if (err)
                        en_err(priv, "Failed disabling multicast filter\n");

                /* Flush mcast filter and init it with broadcast address */
                mlx4_SET_MCAST_FLTR(mdev->dev, priv->port, ETH_BCAST,
                                    1, MLX4_MCAST_CONFIG);

                /* Update multicast list - we cache all addresses so they won't
                 * change while HW is updated holding the command semaphor */
                netif_tx_lock_bh(dev);
                mlx4_en_cache_mclist(dev);
                netif_tx_unlock_bh(dev);
                for (mclist = priv->mc_list; mclist; mclist = mclist->next) {
                        mcast_addr = mlx4_en_mac_to_u64(mclist->dmi_addr);
                        mlx4_SET_MCAST_FLTR(mdev->dev, priv->port,
                                            mcast_addr, 0, MLX4_MCAST_CONFIG);
                }
                err = mlx4_SET_MCAST_FLTR(mdev->dev, priv->port, 0,
                                          0, MLX4_MCAST_ENABLE);
                if (err)
                        en_err(priv, "Failed enabling multicast filter\n");

                mlx4_en_clear_list(dev);
        }
out:
        mutex_unlock(&mdev->state_lock);
}

#ifdef CONFIG_NET_POLL_CONTROLLER
static void mlx4_en_netpoll(struct net_device *dev)
{
        struct mlx4_en_priv *priv = netdev_priv(dev);
        struct mlx4_en_cq *cq;
        unsigned long flags;
        int i;

        for (i = 0; i < priv->rx_ring_num; i++) {
                cq = &priv->rx_cq[i];
                spin_lock_irqsave(&cq->lock, flags);
                napi_synchronize(&cq->napi);
                mlx4_en_process_rx_cq(dev, cq, 0);
                spin_unlock_irqrestore(&cq->lock, flags);
        }
}
#endif

static void mlx4_en_tx_timeout(struct net_device *dev)
{
        struct mlx4_en_priv *priv = netdev_priv(dev);
        struct mlx4_en_dev *mdev = priv->mdev;

        if (netif_msg_timer(priv))
                en_warn(priv, "Tx timeout called on port:%d\n", priv->port);

        priv->port_stats.tx_timeout++;
        en_dbg(DRV, priv, "Scheduling watchdog\n");
        queue_work(mdev->workqueue, &priv->watchdog_task);
}


static struct net_device_stats *mlx4_en_get_stats(struct net_device *dev)
{
        struct mlx4_en_priv *priv = netdev_priv(dev);

        spin_lock_bh(&priv->stats_lock);
        memcpy(&priv->ret_stats, &priv->stats, sizeof(priv->stats));
        spin_unlock_bh(&priv->stats_lock);

        return &priv->ret_stats;
}

static void mlx4_en_set_default_moderation(struct mlx4_en_priv *priv)
{
        struct mlx4_en_cq *cq;
        int i;

        /* If we haven't received a specific coalescing setting
         * (module param), we set the moderation parameters as follows:
         * - moder_cnt is set to the number of mtu sized packets to
         *   satisfy our coelsing target.
         * - moder_time is set to a fixed value.
         */
        priv->rx_frames = MLX4_EN_RX_COAL_TARGET;
        priv->rx_usecs = MLX4_EN_RX_COAL_TIME;
        en_dbg(INTR, priv, "Default coalesing params for mtu:%d - "
                           "rx_frames:%d rx_usecs:%d\n",
                 priv->dev->mtu, priv->rx_frames, priv->rx_usecs);

        /* Setup cq moderation params */
        for (i = 0; i < priv->rx_ring_num; i++) {
                cq = &priv->rx_cq[i];
                cq->moder_cnt = priv->rx_frames;
                cq->moder_time = priv->rx_usecs;
        }

        for (i = 0; i < priv->tx_ring_num; i++) {
                cq = &priv->tx_cq[i];
                cq->moder_cnt = MLX4_EN_TX_COAL_PKTS;
                cq->moder_time = MLX4_EN_TX_COAL_TIME;
        }

        /* Reset auto-moderation params */
        priv->pkt_rate_low = MLX4_EN_RX_RATE_LOW;
        priv->rx_usecs_low = MLX4_EN_RX_COAL_TIME_LOW;
        priv->pkt_rate_high = MLX4_EN_RX_RATE_HIGH;
        priv->rx_usecs_high = MLX4_EN_RX_COAL_TIME_HIGH;
        priv->sample_interval = MLX4_EN_SAMPLE_INTERVAL;
        priv->adaptive_rx_coal = 1;
        priv->last_moder_time = MLX4_EN_AUTO_CONF;
        priv->last_moder_jiffies = 0;
        priv->last_moder_packets = 0;
        priv->last_moder_tx_packets = 0;
        priv->last_moder_bytes = 0;
}

static void mlx4_en_auto_moderation(struct mlx4_en_priv *priv)
{
        unsigned long period = (unsigned long) (jiffies - priv->last_moder_jiffies);
        struct mlx4_en_cq *cq;
        unsigned long packets;
        unsigned long rate;
        unsigned long avg_pkt_size;
        unsigned long rx_packets;
        unsigned long rx_bytes;
        unsigned long rx_byte_diff;
        unsigned long tx_packets;
        unsigned long tx_pkt_diff;
        unsigned long rx_pkt_diff;
        int moder_time;
        int i, err;

        if (!priv->adaptive_rx_coal || period < priv->sample_interval * HZ)
                return;

        spin_lock_bh(&priv->stats_lock);
        rx_packets = priv->stats.rx_packets;
        rx_bytes = priv->stats.rx_bytes;
        tx_packets = priv->stats.tx_packets;
        spin_unlock_bh(&priv->stats_lock);

        if (!priv->last_moder_jiffies || !period)
                goto out;

        tx_pkt_diff = ((unsigned long) (tx_packets -
                                        priv->last_moder_tx_packets));
        rx_pkt_diff = ((unsigned long) (rx_packets -
                                        priv->last_moder_packets));
        packets = max(tx_pkt_diff, rx_pkt_diff);
        rx_byte_diff = rx_bytes - priv->last_moder_bytes;
        rx_byte_diff = rx_byte_diff ? rx_byte_diff : 1;
        rate = packets * HZ / period;
        avg_pkt_size = packets ? ((unsigned long) (rx_bytes -
                                 priv->last_moder_bytes)) / packets : 0;

        /* Apply auto-moderation only when packet rate exceeds a rate that
         * it matters */
        if (rate > MLX4_EN_RX_RATE_THRESH) {
                /* If tx and rx packet rates are not balanced, assume that
                 * traffic is mainly BW bound and apply maximum moderation.
                 * Otherwise, moderate according to packet rate */
                if (2 * tx_pkt_diff > 3 * rx_pkt_diff &&
                    rx_pkt_diff / rx_byte_diff <
                    MLX4_EN_SMALL_PKT_SIZE)
                        moder_time = priv->rx_usecs_low;
                else if (2 * rx_pkt_diff > 3 * tx_pkt_diff)
                        moder_time = priv->rx_usecs_high;
                else {
                        if (rate < priv->pkt_rate_low)
                                moder_time = priv->rx_usecs_low;
                        else if (rate > priv->pkt_rate_high)
                                moder_time = priv->rx_usecs_high;
                        else
                                moder_time = (rate - priv->pkt_rate_low) *
                                        (priv->rx_usecs_high - priv->rx_usecs_low) /
                                        (priv->pkt_rate_high - priv->pkt_rate_low) +
                                        priv->rx_usecs_low;
                }
        } else {
                /* When packet rate is low, use default moderation rather than
                 * 0 to prevent interrupt storms if traffic suddenly increases */
                moder_time = priv->rx_usecs;
        }

        en_dbg(INTR, priv, "tx rate:%lu rx_rate:%lu\n",
               tx_pkt_diff * HZ / period, rx_pkt_diff * HZ / period);

        en_dbg(INTR, priv, "Rx moder_time changed from:%d to %d period:%lu "
               "[jiff] packets:%lu avg_pkt_size:%lu rate:%lu [p/s])\n",
                 priv->last_moder_time, moder_time, period, packets,
                 avg_pkt_size, rate);

        if (moder_time != priv->last_moder_time) {
                priv->last_moder_time = moder_time;
                for (i = 0; i < priv->rx_ring_num; i++) {
                        cq = &priv->rx_cq[i];
                        cq->moder_time = moder_time;
                        err = mlx4_en_set_cq_moder(priv, cq);
                        if (err) {
                                en_err(priv, "Failed modifying moderation for cq:%d\n", i);
                                break;
                        }
                }
        }

out:
        priv->last_moder_packets = rx_packets;
        priv->last_moder_tx_packets = tx_packets;
        priv->last_moder_bytes = rx_bytes;
        priv->last_moder_jiffies = jiffies;
}

static void mlx4_en_do_get_stats(struct work_struct *work)
{
        struct delayed_work *delay = to_delayed_work(work);
        struct mlx4_en_priv *priv = container_of(delay, struct mlx4_en_priv,
                                                 stats_task);
        struct mlx4_en_dev *mdev = priv->mdev;
        int err;

        err = mlx4_en_DUMP_ETH_STATS(mdev, priv->port, 0);
        if (err)
                en_dbg(HW, priv, "Could not update stats \n");

        mutex_lock(&mdev->state_lock);
        if (mdev->device_up) {
                if (priv->port_up)
                        mlx4_en_auto_moderation(priv);

                queue_delayed_work(mdev->workqueue, &priv->stats_task, STATS_DELAY);
        }
        mutex_unlock(&mdev->state_lock);
}

static void mlx4_en_linkstate(struct work_struct *work)
{
        struct mlx4_en_priv *priv = container_of(work, struct mlx4_en_priv,
                                                 linkstate_task);
        struct mlx4_en_dev *mdev = priv->mdev;
        int linkstate = priv->link_state;

        mutex_lock(&mdev->state_lock);
        /* If observable port state changed set carrier state and
         * report to system log */
        if (priv->last_link_state != linkstate) {
                if (linkstate == MLX4_DEV_EVENT_PORT_DOWN) {
                        en_dbg(LINK, priv, "Link Down\n");
                        netif_carrier_off(priv->dev);
                } else {
                        en_dbg(LINK, priv, "Link Up\n");
                        netif_carrier_on(priv->dev);
                }
        }
        priv->last_link_state = linkstate;
        mutex_unlock(&mdev->state_lock);
}


int mlx4_en_start_port(struct net_device *dev)
{
        struct mlx4_en_priv *priv = netdev_priv(dev);
        struct mlx4_en_dev *mdev = priv->mdev;
        struct mlx4_en_cq *cq;
        struct mlx4_en_tx_ring *tx_ring;
        int rx_index = 0;
        int tx_index = 0;
        int err = 0;
        int i;
        int j;

        if (priv->port_up) {
                en_dbg(DRV, priv, "start port called while port already up\n");
                return 0;
        }

        /* Calculate Rx buf size */
        dev->mtu = min(dev->mtu, priv->max_mtu);
        mlx4_en_calc_rx_buf(dev);
        en_dbg(DRV, priv, "Rx buf size:%d\n", priv->rx_skb_size);

        /* Configure rx cq's and rings */
        err = mlx4_en_activate_rx_rings(priv);
        if (err) {
                en_err(priv, "Failed to activate RX rings\n");
                return err;
        }
        for (i = 0; i < priv->rx_ring_num; i++) {
                cq = &priv->rx_cq[i];

                err = mlx4_en_activate_cq(priv, cq);
                if (err) {
                        en_err(priv, "Failed activating Rx CQ\n");
                        goto cq_err;
                }
                for (j = 0; j < cq->size; j++)
                        cq->buf[j].owner_sr_opcode = MLX4_CQE_OWNER_MASK;
                err = mlx4_en_set_cq_moder(priv, cq);
                if (err) {
                        en_err(priv, "Failed setting cq moderation parameters");
                        mlx4_en_deactivate_cq(priv, cq);
                        goto cq_err;
                }
                mlx4_en_arm_cq(priv, cq);
                priv->rx_ring[i].cqn = cq->mcq.cqn;
                ++rx_index;
        }

        err = mlx4_en_config_rss_steer(priv);
        if (err) {
                en_err(priv, "Failed configuring rss steering\n");
                goto cq_err;
        }

        /* Configure tx cq's and rings */
        for (i = 0; i < priv->tx_ring_num; i++) {
                /* Configure cq */
                cq = &priv->tx_cq[i];
                err = mlx4_en_activate_cq(priv, cq);
                if (err) {
                        en_err(priv, "Failed allocating Tx CQ\n");
                        goto tx_err;
                }
                err = mlx4_en_set_cq_moder(priv, cq);
                if (err) {
                        en_err(priv, "Failed setting cq moderation parameters");
                        mlx4_en_deactivate_cq(priv, cq);
                        goto tx_err;
                }
                en_dbg(DRV, priv, "Resetting index of collapsed CQ:%d to -1\n", i);
                cq->buf->wqe_index = cpu_to_be16(0xffff);

                /* Configure ring */
                tx_ring = &priv->tx_ring[i];
                err = mlx4_en_activate_tx_ring(priv, tx_ring, cq->mcq.cqn);
                if (err) {
                        en_err(priv, "Failed allocating Tx ring\n");
                        mlx4_en_deactivate_cq(priv, cq);
                        goto tx_err;
                }
                /* Set initial ownership of all Tx TXBBs to SW (1) */
                for (j = 0; j < tx_ring->buf_size; j += STAMP_STRIDE)
                        *((u32 *) (tx_ring->buf + j)) = 0xffffffff;
                ++tx_index;
        }

        /* Configure port */
        err = mlx4_SET_PORT_general(mdev->dev, priv->port,
                                    priv->rx_skb_size + ETH_FCS_LEN,
                                    priv->prof->tx_pause,
                                    priv->prof->tx_ppp,
                                    priv->prof->rx_pause,
                                    priv->prof->rx_ppp);
        if (err) {
                en_err(priv, "Failed setting port general configurations "
                             "for port %d, with error %d\n", priv->port, err);
                goto tx_err;
        }
        /* Set default qp number */
        err = mlx4_SET_PORT_qpn_calc(mdev->dev, priv->port, priv->base_qpn, 0);
        if (err) {
                en_err(priv, "Failed setting default qp numbers\n");
                goto tx_err;
        }
        /* Set port mac number */
        en_dbg(DRV, priv, "Setting mac for port %d\n", priv->port);
        err = mlx4_register_mac(mdev->dev, priv->port,
                                priv->mac, &priv->mac_index);
        if (err) {
                en_err(priv, "Failed setting port mac\n");
                goto tx_err;
        }

        /* Init port */
        en_dbg(HW, priv, "Initializing port\n");
        err = mlx4_INIT_PORT(mdev->dev, priv->port);
        if (err) {
                en_err(priv, "Failed Initializing port\n");
                goto mac_err;
        }

        /* Schedule multicast task to populate multicast list */
        queue_work(mdev->workqueue, &priv->mcast_task);

        priv->port_up = true;
        netif_tx_start_all_queues(dev);
        return 0;

mac_err:
        mlx4_unregister_mac(mdev->dev, priv->port, priv->mac_index);
tx_err:
        while (tx_index--) {
                mlx4_en_deactivate_tx_ring(priv, &priv->tx_ring[tx_index]);
                mlx4_en_deactivate_cq(priv, &priv->tx_cq[tx_index]);
        }

        mlx4_en_release_rss_steer(priv);
cq_err:
        while (rx_index--)
                mlx4_en_deactivate_cq(priv, &priv->rx_cq[rx_index]);
        for (i = 0; i < priv->rx_ring_num; i++)
                mlx4_en_deactivate_rx_ring(priv, &priv->rx_ring[i]);

        return err; /* need to close devices */
}


void mlx4_en_stop_port(struct net_device *dev)
{
        struct mlx4_en_priv *priv = netdev_priv(dev);
        struct mlx4_en_dev *mdev = priv->mdev;
        int i;

        if (!priv->port_up) {
                en_dbg(DRV, priv, "stop port called while port already down\n");
                return;
        }

        /* Synchronize with tx routine */
        netif_tx_lock_bh(dev);
        netif_tx_stop_all_queues(dev);
        netif_tx_unlock_bh(dev);

        /* close port*/
        priv->port_up = false;
        mlx4_CLOSE_PORT(mdev->dev, priv->port);

        /* Unregister Mac address for the port */
        mlx4_unregister_mac(mdev->dev, priv->port, priv->mac_index);

        /* Free TX Rings */
        for (i = 0; i < priv->tx_ring_num; i++) {
                mlx4_en_deactivate_tx_ring(priv, &priv->tx_ring[i]);
                mlx4_en_deactivate_cq(priv, &priv->tx_cq[i]);
        }
        msleep(10);

        for (i = 0; i < priv->tx_ring_num; i++)
                mlx4_en_free_tx_buf(dev, &priv->tx_ring[i]);

        /* Free RSS qps */
        mlx4_en_release_rss_steer(priv);

        /* Free RX Rings */
        for (i = 0; i < priv->rx_ring_num; i++) {
                mlx4_en_deactivate_rx_ring(priv, &priv->rx_ring[i]);
                while (test_bit(NAPI_STATE_SCHED, &priv->rx_cq[i].napi.state))
                        msleep(1);
                mlx4_en_deactivate_cq(priv, &priv->rx_cq[i]);
        }
}

static void mlx4_en_restart(struct work_struct *work)
{
        struct mlx4_en_priv *priv = container_of(work, struct mlx4_en_priv,
                                                 watchdog_task);
        struct mlx4_en_dev *mdev = priv->mdev;
        struct net_device *dev = priv->dev;

        en_dbg(DRV, priv, "Watchdog task called for port %d\n", priv->port);

        mutex_lock(&mdev->state_lock);
        if (priv->port_up) {
                mlx4_en_stop_port(dev);
                if (mlx4_en_start_port(dev))
                        en_err(priv, "Failed restarting port %d\n", priv->port);
        }
        mutex_unlock(&mdev->state_lock);
}


static int mlx4_en_open(struct net_device *dev)
{
        struct mlx4_en_priv *priv = netdev_priv(dev);
        struct mlx4_en_dev *mdev = priv->mdev;
        int i;
        int err = 0;

        mutex_lock(&mdev->state_lock);

        if (!mdev->device_up) {
                en_err(priv, "Cannot open - device down/disabled\n");
                err = -EBUSY;
                goto out;
        }

        /* Reset HW statistics and performance counters */
        if (mlx4_en_DUMP_ETH_STATS(mdev, priv->port, 1))
                en_dbg(HW, priv, "Failed dumping statistics\n");

        memset(&priv->stats, 0, sizeof(priv->stats));
        memset(&priv->pstats, 0, sizeof(priv->pstats));

        for (i = 0; i < priv->tx_ring_num; i++) {
                priv->tx_ring[i].bytes = 0;
                priv->tx_ring[i].packets = 0;
        }
        for (i = 0; i < priv->rx_ring_num; i++) {
                priv->rx_ring[i].bytes = 0;
                priv->rx_ring[i].packets = 0;
        }

        mlx4_en_set_default_moderation(priv);
        err = mlx4_en_start_port(dev);
        if (err)
                en_err(priv, "Failed starting port:%d\n", priv->port);

out:
        mutex_unlock(&mdev->state_lock);
        return err;
}


static int mlx4_en_close(struct net_device *dev)
{
        struct mlx4_en_priv *priv = netdev_priv(dev);
        struct mlx4_en_dev *mdev = priv->mdev;

        en_dbg(IFDOWN, priv, "Close port called\n");

        mutex_lock(&mdev->state_lock);

        mlx4_en_stop_port(dev);
        netif_carrier_off(dev);

        mutex_unlock(&mdev->state_lock);
        return 0;
}

void mlx4_en_free_resources(struct mlx4_en_priv *priv)
{
        int i;

        for (i = 0; i < priv->tx_ring_num; i++) {
                if (priv->tx_ring[i].tx_info)
                        mlx4_en_destroy_tx_ring(priv, &priv->tx_ring[i]);
                if (priv->tx_cq[i].buf)
                        mlx4_en_destroy_cq(priv, &priv->tx_cq[i]);
        }

        for (i = 0; i < priv->rx_ring_num; i++) {
                if (priv->rx_ring[i].rx_info)
                        mlx4_en_destroy_rx_ring(priv, &priv->rx_ring[i]);
                if (priv->rx_cq[i].buf)
                        mlx4_en_destroy_cq(priv, &priv->rx_cq[i]);
        }
}

int mlx4_en_alloc_resources(struct mlx4_en_priv *priv)
{
        struct mlx4_en_port_profile *prof = priv->prof;
        int i;

        /* Create tx Rings */
        for (i = 0; i < priv->tx_ring_num; i++) {
                if (mlx4_en_create_cq(priv, &priv->tx_cq[i],
                                      prof->tx_ring_size, i, TX))
                        goto err;

                if (mlx4_en_create_tx_ring(priv, &priv->tx_ring[i],
                                           prof->tx_ring_size, TXBB_SIZE))
                        goto err;
        }

        /* Create rx Rings */
        for (i = 0; i < priv->rx_ring_num; i++) {
                if (mlx4_en_create_cq(priv, &priv->rx_cq[i],
                                      prof->rx_ring_size, i, RX))
                        goto err;

                if (mlx4_en_create_rx_ring(priv, &priv->rx_ring[i],
                                           prof->rx_ring_size, priv->stride))
                        goto err;
        }

        return 0;

err:
        en_err(priv, "Failed to allocate NIC resources\n");
        return -ENOMEM;
}


void mlx4_en_destroy_netdev(struct net_device *dev)
{
        struct mlx4_en_priv *priv = netdev_priv(dev);
        struct mlx4_en_dev *mdev = priv->mdev;

        en_dbg(DRV, priv, "Destroying netdev on port:%d\n", priv->port);

        /* Unregister device - this will close the port if it was up */
        if (priv->registered)
                unregister_netdev(dev);

        if (priv->allocated)
                mlx4_free_hwq_res(mdev->dev, &priv->res, MLX4_EN_PAGE_SIZE);

        cancel_delayed_work(&priv->stats_task);
        /* flush any pending task for this netdev */
        flush_workqueue(mdev->workqueue);

        /* Detach the netdev so tasks would not attempt to access it */
        mutex_lock(&mdev->state_lock);
        mdev->pndev[priv->port] = NULL;
        mutex_unlock(&mdev->state_lock);

        mlx4_en_free_resources(priv);
        free_netdev(dev);
}

static int mlx4_en_change_mtu(struct net_device *dev, int new_mtu)
{
        struct mlx4_en_priv *priv = netdev_priv(dev);
        struct mlx4_en_dev *mdev = priv->mdev;
        int err = 0;

        en_dbg(DRV, priv, "Change MTU called - current:%d new:%d\n",
                 dev->mtu, new_mtu);

        if ((new_mtu < MLX4_EN_MIN_MTU) || (new_mtu > priv->max_mtu)) {
                en_err(priv, "Bad MTU size:%d.\n", new_mtu);
                return -EPERM;
        }
        dev->mtu = new_mtu;

        if (netif_running(dev)) {
                mutex_lock(&mdev->state_lock);
                if (!mdev->device_up) {
                        /* NIC is probably restarting - let watchdog task reset
                         * the port */
                        en_dbg(DRV, priv, "Change MTU called with card down!?\n");
                } else {
                        mlx4_en_stop_port(dev);
                        mlx4_en_set_default_moderation(priv);
                        err = mlx4_en_start_port(dev);
                        if (err) {
                                en_err(priv, "Failed restarting port:%d\n",
                                         priv->port);
                                queue_work(mdev->workqueue, &priv->watchdog_task);
                        }
                }
                mutex_unlock(&mdev->state_lock);
        }
        return 0;
}

static const struct net_device_ops mlx4_netdev_ops = {
        .ndo_open               = mlx4_en_open,
        .ndo_stop               = mlx4_en_close,
        .ndo_start_xmit         = mlx4_en_xmit,
        .ndo_select_queue       = mlx4_en_select_queue,
        .ndo_get_stats          = mlx4_en_get_stats,
        .ndo_set_multicast_list = mlx4_en_set_multicast,
        .ndo_set_mac_address    = mlx4_en_set_mac,
        .ndo_validate_addr      = eth_validate_addr,
        .ndo_change_mtu         = mlx4_en_change_mtu,
        .ndo_tx_timeout         = mlx4_en_tx_timeout,
        .ndo_vlan_rx_register   = mlx4_en_vlan_rx_register,
        .ndo_vlan_rx_add_vid    = mlx4_en_vlan_rx_add_vid,
        .ndo_vlan_rx_kill_vid   = mlx4_en_vlan_rx_kill_vid,
#ifdef CONFIG_NET_POLL_CONTROLLER
        .ndo_poll_controller    = mlx4_en_netpoll,
#endif
};

int mlx4_en_init_netdev(struct mlx4_en_dev *mdev, int port,
                        struct mlx4_en_port_profile *prof)
{
        struct net_device *dev;
        struct mlx4_en_priv *priv;
        int i;
        int err;

        dev = alloc_etherdev_mq(sizeof(struct mlx4_en_priv), prof->tx_ring_num);
        if (dev == NULL) {
                mlx4_err(mdev, "Net device allocation failed\n");
                return -ENOMEM;
        }

        SET_NETDEV_DEV(dev, &mdev->dev->pdev->dev);

        /*
         * Initialize driver private data
         */

        priv = netdev_priv(dev);
        memset(priv, 0, sizeof(struct mlx4_en_priv));
        priv->dev = dev;
        priv->mdev = mdev;
        priv->prof = prof;
        priv->port = port;
        priv->port_up = false;
        priv->rx_csum = 1;
        priv->flags = prof->flags;
        priv->tx_ring_num = prof->tx_ring_num;
        priv->rx_ring_num = prof->rx_ring_num;
        priv->mc_list = NULL;
        priv->mac_index = -1;
        priv->msg_enable = MLX4_EN_MSG_LEVEL;
        spin_lock_init(&priv->stats_lock);
        INIT_WORK(&priv->mcast_task, mlx4_en_do_set_multicast);
        INIT_WORK(&priv->mac_task, mlx4_en_do_set_mac);
        INIT_WORK(&priv->watchdog_task, mlx4_en_restart);
        INIT_WORK(&priv->linkstate_task, mlx4_en_linkstate);
        INIT_DELAYED_WORK(&priv->stats_task, mlx4_en_do_get_stats);

        /* Query for default mac and max mtu */
        priv->max_mtu = mdev->dev->caps.eth_mtu_cap[priv->port];
        priv->mac = mdev->dev->caps.def_mac[priv->port];
        if (ILLEGAL_MAC(priv->mac)) {
                en_err(priv, "Port: %d, invalid mac burned: 0x%llx, quiting\n",
                         priv->port, priv->mac);
                err = -EINVAL;
                goto out;
        }

        priv->stride = roundup_pow_of_two(sizeof(struct mlx4_en_rx_desc) +
                                          DS_SIZE * MLX4_EN_MAX_RX_FRAGS);
        err = mlx4_en_alloc_resources(priv);
        if (err)
                goto out;

        /* Allocate page for receive rings */
        err = mlx4_alloc_hwq_res(mdev->dev, &priv->res,
                                MLX4_EN_PAGE_SIZE, MLX4_EN_PAGE_SIZE);
        if (err) {
                en_err(priv, "Failed to allocate page for rx qps\n");
                goto out;
        }
        priv->allocated = 1;

        /*
         * Initialize netdev entry points
         */
        dev->netdev_ops = &mlx4_netdev_ops;
        dev->watchdog_timeo = MLX4_EN_WATCHDOG_TIMEOUT;
        dev->real_num_tx_queues = MLX4_EN_NUM_TX_RINGS;

        SET_ETHTOOL_OPS(dev, &mlx4_en_ethtool_ops);

        /* Set defualt MAC */
        dev->addr_len = ETH_ALEN;
        for (i = 0; i < ETH_ALEN; i++)
                dev->dev_addr[ETH_ALEN - 1 - i] =
                (u8) (priv->mac >> (8 * i));

        /*
         * Set driver features
         */
        dev->features |= NETIF_F_SG;
        dev->vlan_features |= NETIF_F_SG;
        dev->features |= NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;
        dev->vlan_features |= NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;
        dev->features |= NETIF_F_HIGHDMA;
        dev->features |= NETIF_F_HW_VLAN_TX |
                         NETIF_F_HW_VLAN_RX |
                         NETIF_F_HW_VLAN_FILTER;
        if (mdev->profile.num_lro)
                dev->features |= NETIF_F_LRO;
        if (mdev->LSO_support) {
                dev->features |= NETIF_F_TSO;
                dev->features |= NETIF_F_TSO6;
                dev->vlan_features |= NETIF_F_TSO;
                dev->vlan_features |= NETIF_F_TSO6;
        }

        mdev->pndev[port] = dev;

        netif_carrier_off(dev);
        err = register_netdev(dev);
        if (err) {
                en_err(priv, "Netdev registration failed for port %d\n", port);
                goto out;
        }

        en_warn(priv, "Using %d TX rings\n", prof->tx_ring_num);
        en_warn(priv, "Using %d RX rings\n", prof->rx_ring_num);

        priv->registered = 1;
        queue_delayed_work(mdev->workqueue, &priv->stats_task, STATS_DELAY);
        return 0;

out:
        mlx4_en_destroy_netdev(dev);
        return err;
}