en_netdev.c

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/*
 * 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/slab.h>
#include <linux/hash.h>
#include <net/ip.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 int mlx4_en_setup_tc(struct net_device *dev, u8 up)
{
    struct mlx4_en_priv *priv = netdev_priv(dev);
    int i;
    unsigned int q, offset = 0;

    if (up && up != MLX4_EN_NUM_UP)
        return -EINVAL;

    netdev_set_num_tc(dev, up);

    /* Partition Tx queues evenly amongst UP's */
    q = priv->tx_ring_num / up;
    for (i = 0; i < up; i++) {
        netdev_set_tc_queue(dev, i, q, offset);
        offset += q;
    }

    return 0;
}

#ifdef CONFIG_RFS_ACCEL

struct mlx4_en_filter {
    struct list_head next;
    struct work_struct work;

    __be32 src_ip;
    __be32 dst_ip;
    __be16 src_port;
    __be16 dst_port;

    int rxq_index;
    struct mlx4_en_priv *priv;
    u32 flow_id;            /* RFS infrastructure id */
    int id;             /* mlx4_en driver id */
    u64 reg_id;         /* Flow steering API id */
    u8 activated;           /* Used to prevent expiry before filter
                     * is attached
                     */
    struct hlist_node filter_chain;
};

static void mlx4_en_filter_rfs_expire(struct mlx4_en_priv *priv);

static void mlx4_en_filter_work(struct work_struct *work)
{
    struct mlx4_en_filter *filter = container_of(work,
                             struct mlx4_en_filter,
                             work);
    struct mlx4_en_priv *priv = filter->priv;
    struct mlx4_spec_list spec_tcp = {
        .id = MLX4_NET_TRANS_RULE_ID_TCP,
        {
            .tcp_udp = {
                .dst_port = filter->dst_port,
                .dst_port_msk = (__force __be16)-1,
                .src_port = filter->src_port,
                .src_port_msk = (__force __be16)-1,
            },
        },
    };
    struct mlx4_spec_list spec_ip = {
        .id = MLX4_NET_TRANS_RULE_ID_IPV4,
        {
            .ipv4 = {
                .dst_ip = filter->dst_ip,
                .dst_ip_msk = (__force __be32)-1,
                .src_ip = filter->src_ip,
                .src_ip_msk = (__force __be32)-1,
            },
        },
    };
    struct mlx4_spec_list spec_eth = {
        .id = MLX4_NET_TRANS_RULE_ID_ETH,
    };
    struct mlx4_net_trans_rule rule = {
        .list = LIST_HEAD_INIT(rule.list),
        .queue_mode = MLX4_NET_TRANS_Q_LIFO,
        .exclusive = 1,
        .allow_loopback = 1,
        .promisc_mode = MLX4_FS_PROMISC_NONE,
        .port = priv->port,
        .priority = MLX4_DOMAIN_RFS,
    };
    int rc;
    __be64 mac;
    __be64 mac_mask = cpu_to_be64(MLX4_MAC_MASK << 16);

    list_add_tail(&spec_eth.list, &rule.list);
    list_add_tail(&spec_ip.list, &rule.list);
    list_add_tail(&spec_tcp.list, &rule.list);

    mac = cpu_to_be64((priv->mac & MLX4_MAC_MASK) << 16);

    rule.qpn = priv->rss_map.qps[filter->rxq_index].qpn;
    memcpy(spec_eth.eth.dst_mac, &mac, ETH_ALEN);
    memcpy(spec_eth.eth.dst_mac_msk, &mac_mask, ETH_ALEN);

    filter->activated = 0;

    if (filter->reg_id) {
        rc = mlx4_flow_detach(priv->mdev->dev, filter->reg_id);
        if (rc && rc != -ENOENT)
            en_err(priv, "Error detaching flow. rc = %d\n", rc);
    }

    rc = mlx4_flow_attach(priv->mdev->dev, &rule, &filter->reg_id);
    if (rc)
        en_err(priv, "Error attaching flow. err = %d\n", rc);

    mlx4_en_filter_rfs_expire(priv);

    filter->activated = 1;
}

static inline struct hlist_head *
filter_hash_bucket(struct mlx4_en_priv *priv, __be32 src_ip, __be32 dst_ip,
           __be16 src_port, __be16 dst_port)
{
    unsigned long l;
    int bucket_idx;

    l = (__force unsigned long)src_port |
        ((__force unsigned long)dst_port << 2);
    l ^= (__force unsigned long)(src_ip ^ dst_ip);

    bucket_idx = hash_long(l, MLX4_EN_FILTER_HASH_SHIFT);

    return &priv->filter_hash[bucket_idx];
}

static struct mlx4_en_filter *
mlx4_en_filter_alloc(struct mlx4_en_priv *priv, int rxq_index, __be32 src_ip,
             __be32 dst_ip, __be16 src_port, __be16 dst_port,
             u32 flow_id)
{
    struct mlx4_en_filter *filter = NULL;

    filter = kzalloc(sizeof(struct mlx4_en_filter), GFP_ATOMIC);
    if (!filter)
        return NULL;

    filter->priv = priv;
    filter->rxq_index = rxq_index;
    INIT_WORK(&filter->work, mlx4_en_filter_work);

    filter->src_ip = src_ip;
    filter->dst_ip = dst_ip;
    filter->src_port = src_port;
    filter->dst_port = dst_port;

    filter->flow_id = flow_id;

    filter->id = priv->last_filter_id++ % RPS_NO_FILTER;

    list_add_tail(&filter->next, &priv->filters);
    hlist_add_head(&filter->filter_chain,
               filter_hash_bucket(priv, src_ip, dst_ip, src_port,
                      dst_port));

    return filter;
}

static void mlx4_en_filter_free(struct mlx4_en_filter *filter)
{
    struct mlx4_en_priv *priv = filter->priv;
    int rc;

    list_del(&filter->next);

    rc = mlx4_flow_detach(priv->mdev->dev, filter->reg_id);
    if (rc && rc != -ENOENT)
        en_err(priv, "Error detaching flow. rc = %d\n", rc);

    kfree(filter);
}

static inline struct mlx4_en_filter *
mlx4_en_filter_find(struct mlx4_en_priv *priv, __be32 src_ip, __be32 dst_ip,
            __be16 src_port, __be16 dst_port)
{
    struct hlist_node *elem;
    struct mlx4_en_filter *filter;
    struct mlx4_en_filter *ret = NULL;

    hlist_for_each_entry(filter, elem,
                 filter_hash_bucket(priv, src_ip, dst_ip,
                        src_port, dst_port),
                 filter_chain) {
        if (filter->src_ip == src_ip &&
            filter->dst_ip == dst_ip &&
            filter->src_port == src_port &&
            filter->dst_port == dst_port) {
            ret = filter;
            break;
        }
    }

    return ret;
}

static int
mlx4_en_filter_rfs(struct net_device *net_dev, const struct sk_buff *skb,
           u16 rxq_index, u32 flow_id)
{
    struct mlx4_en_priv *priv = netdev_priv(net_dev);
    struct mlx4_en_filter *filter;
    const struct iphdr *ip;
    const __be16 *ports;
    __be32 src_ip;
    __be32 dst_ip;
    __be16 src_port;
    __be16 dst_port;
    int nhoff = skb_network_offset(skb);
    int ret = 0;

    if (skb->protocol != htons(ETH_P_IP))
        return -EPROTONOSUPPORT;

    ip = (const struct iphdr *)(skb->data + nhoff);
    if (ip_is_fragment(ip))
        return -EPROTONOSUPPORT;

    ports = (const __be16 *)(skb->data + nhoff + 4 * ip->ihl);

    src_ip = ip->saddr;
    dst_ip = ip->daddr;
    src_port = ports[0];
    dst_port = ports[1];

    if (ip->protocol != IPPROTO_TCP)
        return -EPROTONOSUPPORT;

    spin_lock_bh(&priv->filters_lock);
    filter = mlx4_en_filter_find(priv, src_ip, dst_ip, src_port, dst_port);
    if (filter) {
        if (filter->rxq_index == rxq_index)
            goto out;

        filter->rxq_index = rxq_index;
    } else {
        filter = mlx4_en_filter_alloc(priv, rxq_index,
                          src_ip, dst_ip,
                          src_port, dst_port, flow_id);
        if (!filter) {
            ret = -ENOMEM;
            goto err;
        }
    }

    queue_work(priv->mdev->workqueue, &filter->work);

out:
    ret = filter->id;
err:
    spin_unlock_bh(&priv->filters_lock);

    return ret;
}

void mlx4_en_cleanup_filters(struct mlx4_en_priv *priv,
                 struct mlx4_en_rx_ring *rx_ring)
{
    struct mlx4_en_filter *filter, *tmp;
    LIST_HEAD(del_list);

    spin_lock_bh(&priv->filters_lock);
    list_for_each_entry_safe(filter, tmp, &priv->filters, next) {
        list_move(&filter->next, &del_list);
        hlist_del(&filter->filter_chain);
    }
    spin_unlock_bh(&priv->filters_lock);

    list_for_each_entry_safe(filter, tmp, &del_list, next) {
        cancel_work_sync(&filter->work);
        mlx4_en_filter_free(filter);
    }
}

static void mlx4_en_filter_rfs_expire(struct mlx4_en_priv *priv)
{
    struct mlx4_en_filter *filter = NULL, *tmp, *last_filter = NULL;
    LIST_HEAD(del_list);
    int i = 0;

    spin_lock_bh(&priv->filters_lock);
    list_for_each_entry_safe(filter, tmp, &priv->filters, next) {
        if (i > MLX4_EN_FILTER_EXPIRY_QUOTA)
            break;

        if (filter->activated &&
            !work_pending(&filter->work) &&
            rps_may_expire_flow(priv->dev,
                    filter->rxq_index, filter->flow_id,
                    filter->id)) {
            list_move(&filter->next, &del_list);
            hlist_del(&filter->filter_chain);
        } else
            last_filter = filter;

        i++;
    }

    if (last_filter && (&last_filter->next != priv->filters.next))
        list_move(&priv->filters, &last_filter->next);

    spin_unlock_bh(&priv->filters_lock);

    list_for_each_entry_safe(filter, tmp, &del_list, next)
        mlx4_en_filter_free(filter);
}
#endif

static int 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;
    int idx;

    en_dbg(HW, priv, "adding VLAN:%d\n", vid);

    set_bit(vid, priv->active_vlans);

    /* 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);
        if (err)
            en_err(priv, "Failed configuring VLAN filter\n");
    }
    if (mlx4_register_vlan(mdev->dev, priv->port, vid, &idx))
        en_err(priv, "failed adding vlan %d\n", vid);
    mutex_unlock(&mdev->state_lock);

    return 0;
}

static int 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;
    int idx;

    en_dbg(HW, priv, "Killing VID:%d\n", vid);

    clear_bit(vid, priv->active_vlans);

    /* Remove VID from port VLAN filter */
    mutex_lock(&mdev->state_lock);
    if (!mlx4_find_cached_vlan(mdev->dev, priv->port, vid, &idx))
        mlx4_unregister_vlan(mdev->dev, priv->port, idx);
    else
        en_err(priv, "could not find vid %d in cache\n", vid);

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

    return 0;
}

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 */
        err = mlx4_replace_mac(mdev->dev, priv->port,
                       priv->base_qpn, priv->mac);
        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 mlx4_en_mc_list *tmp, *mc_to_del;

    list_for_each_entry_safe(mc_to_del, tmp, &priv->mc_list, list) {
        list_del(&mc_to_del->list);
        kfree(mc_to_del);
    }
}

static void mlx4_en_cache_mclist(struct net_device *dev)
{
    struct mlx4_en_priv *priv = netdev_priv(dev);
    struct netdev_hw_addr *ha;
    struct mlx4_en_mc_list *tmp;

    mlx4_en_clear_list(dev);
    netdev_for_each_mc_addr(ha, dev) {
        tmp = kzalloc(sizeof(struct mlx4_en_mc_list), GFP_ATOMIC);
        if (!tmp) {
            en_err(priv, "failed to allocate multicast list\n");
            mlx4_en_clear_list(dev);
            return;
        }
        memcpy(tmp->addr, ha->addr, ETH_ALEN);
        list_add_tail(&tmp->list, &priv->mc_list);
    }
}

static void update_mclist_flags(struct mlx4_en_priv *priv,
                struct list_head *dst,
                struct list_head *src)
{
    struct mlx4_en_mc_list *dst_tmp, *src_tmp, *new_mc;
    bool found;

    /* Find all the entries that should be removed from dst,
     * These are the entries that are not found in src
     */
    list_for_each_entry(dst_tmp, dst, list) {
        found = false;
        list_for_each_entry(src_tmp, src, list) {
            if (!memcmp(dst_tmp->addr, src_tmp->addr, ETH_ALEN)) {
                found = true;
                break;
            }
        }
        if (!found)
            dst_tmp->action = MCLIST_REM;
    }

    /* Add entries that exist in src but not in dst
     * mark them as need to add
     */
    list_for_each_entry(src_tmp, src, list) {
        found = false;
        list_for_each_entry(dst_tmp, dst, list) {
            if (!memcmp(dst_tmp->addr, src_tmp->addr, ETH_ALEN)) {
                dst_tmp->action = MCLIST_NONE;
                found = true;
                break;
            }
        }
        if (!found) {
            new_mc = kmalloc(sizeof(struct mlx4_en_mc_list),
                     GFP_KERNEL);
            if (!new_mc) {
                en_err(priv, "Failed to allocate current multicast list\n");
                return;
            }
            memcpy(new_mc, src_tmp,
                   sizeof(struct mlx4_en_mc_list));
            new_mc->action = MCLIST_ADD;
            list_add_tail(&new_mc->list, dst);
        }
    }
}

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 mlx4_en_mc_list *mclist, *tmp;
    u64 mcast_addr = 0;
    u8 mc_list[16] = {0};
    int err = 0;

    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;
    }

    if (!netif_carrier_ok(dev)) {
        if (!mlx4_en_QUERY_PORT(mdev, priv->port)) {
            if (priv->port_state.link_state) {
                priv->last_link_state = MLX4_DEV_EVENT_PORT_UP;
                netif_carrier_on(dev);
                en_dbg(LINK, priv, "Link Up\n");
            }
        }
    }

    /*
     * 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 */
            switch (mdev->dev->caps.steering_mode) {
            case MLX4_STEERING_MODE_DEVICE_MANAGED:
                err = mlx4_flow_steer_promisc_add(mdev->dev,
                                  priv->port,
                                  priv->base_qpn,
                                  MLX4_FS_PROMISC_UPLINK);
                if (err)
                    en_err(priv, "Failed enabling promiscuous mode\n");
                priv->flags |= MLX4_EN_FLAG_MC_PROMISC;
                break;

            case MLX4_STEERING_MODE_B0:
                err = mlx4_unicast_promisc_add(mdev->dev,
                                   priv->base_qpn,
                                   priv->port);
                if (err)
                    en_err(priv, "Failed enabling unicast promiscuous mode\n");

                /* Add the default qp number as multicast
                 * promisc
                 */
                if (!(priv->flags & MLX4_EN_FLAG_MC_PROMISC)) {
                    err = mlx4_multicast_promisc_add(mdev->dev,
                                     priv->base_qpn,
                                     priv->port);
                    if (err)
                        en_err(priv, "Failed enabling multicast promiscuous mode\n");
                    priv->flags |= MLX4_EN_FLAG_MC_PROMISC;
                }
                break;

            case MLX4_STEERING_MODE_A0:
                err = mlx4_SET_PORT_qpn_calc(mdev->dev,
                                 priv->port,
                                 priv->base_qpn,
                                 1);
                if (err)
                    en_err(priv, "Failed enabling promiscuous mode\n");
                break;
            }

            /* 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);
            if (err)
                en_err(priv, "Failed disabling VLAN filter\n");
        }
        goto out;
    }

    /*
     * Not in promiscuous 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 */
        switch (mdev->dev->caps.steering_mode) {
        case MLX4_STEERING_MODE_DEVICE_MANAGED:
            err = mlx4_flow_steer_promisc_remove(mdev->dev,
                                 priv->port,
                                 MLX4_FS_PROMISC_UPLINK);
            if (err)
                en_err(priv, "Failed disabling promiscuous mode\n");
            priv->flags &= ~MLX4_EN_FLAG_MC_PROMISC;
            break;

        case MLX4_STEERING_MODE_B0:
            err = mlx4_unicast_promisc_remove(mdev->dev,
                              priv->base_qpn,
                              priv->port);
            if (err)
                en_err(priv, "Failed disabling unicast promiscuous mode\n");
            /* Disable Multicast promisc */
            if (priv->flags & MLX4_EN_FLAG_MC_PROMISC) {
                err = mlx4_multicast_promisc_remove(mdev->dev,
                                    priv->base_qpn,
                                    priv->port);
                if (err)
                    en_err(priv, "Failed disabling multicast promiscuous mode\n");
                priv->flags &= ~MLX4_EN_FLAG_MC_PROMISC;
            }
            break;

        case MLX4_STEERING_MODE_A0:
            err = mlx4_SET_PORT_qpn_calc(mdev->dev,
                             priv->port,
                             priv->base_qpn, 0);
            if (err)
                en_err(priv, "Failed disabling promiscuous mode\n");
            break;
        }

        /* Enable port VLAN filter */
        err = mlx4_SET_VLAN_FLTR(mdev->dev, priv);
        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");

        /* Add the default qp number as multicast promisc */
        if (!(priv->flags & MLX4_EN_FLAG_MC_PROMISC)) {
            switch (mdev->dev->caps.steering_mode) {
            case MLX4_STEERING_MODE_DEVICE_MANAGED:
                err = mlx4_flow_steer_promisc_add(mdev->dev,
                                  priv->port,
                                  priv->base_qpn,
                                  MLX4_FS_PROMISC_ALL_MULTI);
                break;

            case MLX4_STEERING_MODE_B0:
                err = mlx4_multicast_promisc_add(mdev->dev,
                                 priv->base_qpn,
                                 priv->port);
                break;

            case MLX4_STEERING_MODE_A0:
                break;
            }
            if (err)
                en_err(priv, "Failed entering multicast promisc mode\n");
            priv->flags |= MLX4_EN_FLAG_MC_PROMISC;
        }
    } else {
        /* Disable Multicast promisc */
        if (priv->flags & MLX4_EN_FLAG_MC_PROMISC) {
            switch (mdev->dev->caps.steering_mode) {
            case MLX4_STEERING_MODE_DEVICE_MANAGED:
                err = mlx4_flow_steer_promisc_remove(mdev->dev,
                                     priv->port,
                                     MLX4_FS_PROMISC_ALL_MULTI);
                break;

            case MLX4_STEERING_MODE_B0:
                err = mlx4_multicast_promisc_remove(mdev->dev,
                                    priv->base_qpn,
                                    priv->port);
                break;

            case MLX4_STEERING_MODE_A0:
                break;
            }
            if (err)
                en_err(priv, "Failed disabling multicast promiscuous mode\n");
            priv->flags &= ~MLX4_EN_FLAG_MC_PROMISC;
        }

        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);
        list_for_each_entry(mclist, &priv->mc_list, list) {
            mcast_addr = mlx4_en_mac_to_u64(mclist->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");

        update_mclist_flags(priv, &priv->curr_list, &priv->mc_list);
        list_for_each_entry_safe(mclist, tmp, &priv->curr_list, list) {
            if (mclist->action == MCLIST_REM) {
                /* detach this address and delete from list */
                memcpy(&mc_list[10], mclist->addr, ETH_ALEN);
                mc_list[5] = priv->port;
                err = mlx4_multicast_detach(mdev->dev,
                                &priv->rss_map.indir_qp,
                                mc_list,
                                MLX4_PROT_ETH,
                                mclist->reg_id);
                if (err)
                    en_err(priv, "Fail to detach multicast address\n");

                /* remove from list */
                list_del(&mclist->list);
                kfree(mclist);
            } else if (mclist->action == MCLIST_ADD) {
                /* attach the address */
                memcpy(&mc_list[10], mclist->addr, ETH_ALEN);
                /* needed for B0 steering support */
                mc_list[5] = priv->port;
                err = mlx4_multicast_attach(mdev->dev,
                                &priv->rss_map.indir_qp,
                                mc_list,
                                priv->port, 0,
                                MLX4_PROT_ETH,
                                &mclist->reg_id);
                if (err)
                    en_err(priv, "Fail to attach multicast address\n");

            }
        }
    }
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;
    priv->tx_frames = MLX4_EN_TX_COAL_PKTS;
    priv->tx_usecs = MLX4_EN_TX_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;
        priv->last_moder_time[i] = MLX4_EN_AUTO_CONF;
        priv->last_moder_packets[i] = 0;
        priv->last_moder_bytes[i] = 0;
    }

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

    /* 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_jiffies = 0;
    priv->last_moder_tx_packets = 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_pkt_diff;
    int moder_time;
    int ring, err;

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

    for (ring = 0; ring < priv->rx_ring_num; ring++) {
        spin_lock_bh(&priv->stats_lock);
        rx_packets = priv->rx_ring[ring].packets;
        rx_bytes = priv->rx_ring[ring].bytes;
        spin_unlock_bh(&priv->stats_lock);

        rx_pkt_diff = ((unsigned long) (rx_packets -
                priv->last_moder_packets[ring]));
        packets = rx_pkt_diff;
        rate = packets * HZ / period;
        avg_pkt_size = packets ? ((unsigned long) (rx_bytes -
                priv->last_moder_bytes[ring])) / packets : 0;

        /* Apply auto-moderation only when packet rate
         * exceeds a rate that it matters */
        if (rate > (MLX4_EN_RX_RATE_THRESH / priv->rx_ring_num) &&
            avg_pkt_size > MLX4_EN_AVG_PKT_SMALL) {
            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 {
            moder_time = priv->rx_usecs_low;
        }

        if (moder_time != priv->last_moder_time[ring]) {
            priv->last_moder_time[ring] = moder_time;
            cq = &priv->rx_cq[ring];
            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", ring);
        }
        priv->last_moder_packets[ring] = rx_packets;
        priv->last_moder_bytes[ring] = 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);
    }
    if (mdev->mac_removed[MLX4_MAX_PORTS + 1 - priv->port]) {
        queue_work(mdev->workqueue, &priv->mac_task);
        mdev->mac_removed[MLX4_MAX_PORTS + 1 - priv->port] = 0;
    }
    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_info(priv, "Link Down\n");
            netif_carrier_off(priv->dev);
        } else {
            en_info(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;
    u8 mc_list[16] = {0};

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

    INIT_LIST_HEAD(&priv->mc_list);
    INIT_LIST_HEAD(&priv->curr_list);

    /* 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, i);
        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;
    }

    /* Set qp number */
    en_dbg(DRV, priv, "Getting qp number for port %d\n", priv->port);
    err = mlx4_get_eth_qp(mdev->dev, priv->port,
                priv->mac, &priv->base_qpn);
    if (err) {
        en_err(priv, "Failed getting eth qp\n");
        goto cq_err;
    }
    mdev->mac_removed[priv->port] = 0;

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

    err = mlx4_en_create_drop_qp(priv);
    if (err)
        goto rss_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, i);
        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,
            i / priv->mdev->profile.num_tx_rings_p_up);
        if (err) {
            en_err(priv, "Failed allocating Tx ring\n");
            mlx4_en_deactivate_cq(priv, cq);
            goto tx_err;
        }
        tx_ring->tx_queue = netdev_get_tx_queue(dev, i);

        /* Arm CQ for TX completions */
        mlx4_en_arm_cq(priv, cq);

        /* 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;
    }

    /* 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 tx_err;
    }

    /* Attach rx QP to bradcast address */
    memset(&mc_list[10], 0xff, ETH_ALEN);
    mc_list[5] = priv->port; /* needed for B0 steering support */
    if (mlx4_multicast_attach(mdev->dev, &priv->rss_map.indir_qp, mc_list,
                  priv->port, 0, MLX4_PROT_ETH,
                  &priv->broadcast_id))
        mlx4_warn(mdev, "Failed Attaching Broadcast\n");

    /* Must redo promiscuous mode setup. */
    priv->flags &= ~(MLX4_EN_FLAG_PROMISC | MLX4_EN_FLAG_MC_PROMISC);
    if (mdev->dev->caps.steering_mode ==
        MLX4_STEERING_MODE_DEVICE_MANAGED) {
        mlx4_flow_steer_promisc_remove(mdev->dev,
                           priv->port,
                           MLX4_FS_PROMISC_UPLINK);
        mlx4_flow_steer_promisc_remove(mdev->dev,
                           priv->port,
                           MLX4_FS_PROMISC_ALL_MULTI);
    }

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

    mlx4_set_stats_bitmap(mdev->dev, &priv->stats_bitmap);

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

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_destroy_drop_qp(priv);
rss_err:
    mlx4_en_release_rss_steer(priv);
mac_err:
    mlx4_put_eth_qp(mdev->dev, priv->port, priv->mac, priv->base_qpn);
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;
    struct mlx4_en_mc_list *mclist, *tmp;
    int i;
    u8 mc_list[16] = {0};

    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);

    /* Set port as not active */
    priv->port_up = false;

    /* Detach All multicasts */
    memset(&mc_list[10], 0xff, ETH_ALEN);
    mc_list[5] = priv->port; /* needed for B0 steering support */
    mlx4_multicast_detach(mdev->dev, &priv->rss_map.indir_qp, mc_list,
                  MLX4_PROT_ETH, priv->broadcast_id);
    list_for_each_entry(mclist, &priv->curr_list, list) {
        memcpy(&mc_list[10], mclist->addr, ETH_ALEN);
        mc_list[5] = priv->port;
        mlx4_multicast_detach(mdev->dev, &priv->rss_map.indir_qp,
                      mc_list, MLX4_PROT_ETH, mclist->reg_id);
    }
    mlx4_en_clear_list(dev);
    list_for_each_entry_safe(mclist, tmp, &priv->curr_list, list) {
        list_del(&mclist->list);
        kfree(mclist);
    }

    /* Flush multicast filter */
    mlx4_SET_MCAST_FLTR(mdev->dev, priv->port, 0, 1, MLX4_MCAST_CONFIG);

    mlx4_en_destroy_drop_qp(priv);

    /* 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);

    /* Unregister Mac address for the port */
    mlx4_put_eth_qp(mdev->dev, priv->port, priv->mac, priv->base_qpn);
    mdev->mac_removed[priv->port] = 1;

    /* 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]);
    }

    /* close port*/
    mlx4_CLOSE_PORT(mdev->dev, priv->port);
}

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;
    int i;

    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);
        for (i = 0; i < priv->tx_ring_num; i++)
            netdev_tx_reset_queue(priv->tx_ring[i].tx_queue);
        if (mlx4_en_start_port(dev))
            en_err(priv, "Failed restarting port %d\n", priv->port);
    }
    mutex_unlock(&mdev->state_lock);
}

static void mlx4_en_clear_stats(struct net_device *dev)
{
    struct mlx4_en_priv *priv = netdev_priv(dev);
    struct mlx4_en_dev *mdev = priv->mdev;
    int i;

    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));
    memset(&priv->pkstats, 0, sizeof(priv->pkstats));
    memset(&priv->port_stats, 0, sizeof(priv->port_stats));

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

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 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 SW counters */
    mlx4_en_clear_stats(dev);

    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;

#ifdef CONFIG_RFS_ACCEL
    free_irq_cpu_rmap(priv->dev->rx_cpu_rmap);
    priv->dev->rx_cpu_rmap = NULL;
#endif

    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],
                priv->prof->rx_ring_size, priv->stride);
        if (priv->rx_cq[i].buf)
            mlx4_en_destroy_cq(priv, &priv->rx_cq[i]);
    }

    if (priv->base_tx_qpn) {
        mlx4_qp_release_range(priv->mdev->dev, priv->base_tx_qpn, priv->tx_ring_num);
        priv->base_tx_qpn = 0;
    }
}

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

    err = mlx4_qp_reserve_range(priv->mdev->dev, priv->tx_ring_num, 256, &priv->base_tx_qpn);
    if (err) {
        en_err(priv, "failed reserving range for TX rings\n");
        return err;
    }

    /* 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], priv->base_tx_qpn + 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;
    }

#ifdef CONFIG_RFS_ACCEL
    priv->dev->rx_cpu_rmap = alloc_irq_cpu_rmap(priv->rx_ring_num);
    if (!priv->dev->rx_cpu_rmap)
        goto err;

    INIT_LIST_HEAD(&priv->filters);
    spin_lock_init(&priv->filters_lock);
#endif

    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);

    kfree(priv->tx_ring);
    kfree(priv->tx_cq);

    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);
            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 int mlx4_en_set_features(struct net_device *netdev,
        netdev_features_t features)
{
    struct mlx4_en_priv *priv = netdev_priv(netdev);

    if (features & NETIF_F_LOOPBACK)
        priv->ctrl_flags |= cpu_to_be32(MLX4_WQE_CTRL_FORCE_LOOPBACK);
    else
        priv->ctrl_flags &=
            cpu_to_be32(~MLX4_WQE_CTRL_FORCE_LOOPBACK);

    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_rx_mode    = 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_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
    .ndo_set_features   = mlx4_en_set_features,
    .ndo_setup_tc       = mlx4_en_setup_tc,
#ifdef CONFIG_RFS_ACCEL
    .ndo_rx_flow_steer  = mlx4_en_filter_rfs,
#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_mqs(sizeof(struct mlx4_en_priv),
        prof->tx_ring_num, prof->rx_ring_num);
    if (dev == NULL)
        return -ENOMEM;

    SET_NETDEV_DEV(dev, &mdev->dev->pdev->dev);
    dev->dev_id =  port - 1;

    /*
     * Initialize driver private data
     */

    priv = netdev_priv(dev);
    memset(priv, 0, sizeof(struct mlx4_en_priv));
    priv->dev = dev;
    priv->mdev = mdev;
    priv->ddev = &mdev->pdev->dev;
    priv->prof = prof;
    priv->port = port;
    priv->port_up = false;
    priv->flags = prof->flags;
    priv->ctrl_flags = cpu_to_be32(MLX4_WQE_CTRL_CQ_UPDATE |
            MLX4_WQE_CTRL_SOLICITED);
    priv->tx_ring_num = prof->tx_ring_num;
    priv->tx_ring = kzalloc(sizeof(struct mlx4_en_tx_ring) *
            priv->tx_ring_num, GFP_KERNEL);
    if (!priv->tx_ring) {
        err = -ENOMEM;
        goto out;
    }
    priv->tx_cq = kzalloc(sizeof(struct mlx4_en_cq) * priv->tx_ring_num,
            GFP_KERNEL);
    if (!priv->tx_cq) {
        err = -ENOMEM;
        goto out;
    }
    priv->rx_ring_num = prof->rx_ring_num;
    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);
#ifdef CONFIG_MLX4_EN_DCB
    if (!mlx4_is_slave(priv->mdev->dev))
        dev->dcbnl_ops = &mlx4_en_dcbnl_ops;
#endif

    /* 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;
    netif_set_real_num_tx_queues(dev, priv->tx_ring_num);
    netif_set_real_num_rx_queues(dev, priv->rx_ring_num);

    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));
        dev->perm_addr[ETH_ALEN - 1 - i] = (u8) (priv->mac >> (8 * i));
    }

    /*
     * Set driver features
     */
    dev->hw_features = NETIF_F_SG | NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;
    if (mdev->LSO_support)
        dev->hw_features |= NETIF_F_TSO | NETIF_F_TSO6;

    dev->vlan_features = dev->hw_features;

    dev->hw_features |= NETIF_F_RXCSUM | NETIF_F_RXHASH;
    dev->features = dev->hw_features | NETIF_F_HIGHDMA |
            NETIF_F_HW_VLAN_TX | NETIF_F_HW_VLAN_RX |
            NETIF_F_HW_VLAN_FILTER;
    dev->hw_features |= NETIF_F_LOOPBACK;

    if (mdev->dev->caps.steering_mode ==
        MLX4_STEERING_MODE_DEVICE_MANAGED)
        dev->hw_features |= NETIF_F_NTUPLE;

    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;
    }
    priv->registered = 1;

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

    /* Configure port */
    mlx4_en_calc_rx_buf(dev);
    err = mlx4_SET_PORT_general(mdev->dev, priv->port,
                    priv->rx_skb_size + ETH_FCS_LEN,
                    prof->tx_pause, prof->tx_ppp,
                    prof->rx_pause, prof->rx_ppp);
    if (err) {
        en_err(priv, "Failed setting port general configurations "
               "for port %d, with error %d\n", priv->port, err);
        goto out;
    }

    /* Init port */
    en_warn(priv, "Initializing port\n");
    err = mlx4_INIT_PORT(mdev->dev, priv->port);
    if (err) {
        en_err(priv, "Failed Initializing port\n");
        goto out;
    }
    mlx4_en_set_default_moderation(priv);
    queue_delayed_work(mdev->workqueue, &priv->stats_task, STATS_DELAY);
    return 0;

out:
    mlx4_en_destroy_netdev(dev);
    return err;
}