dhd_linux.c

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/*
 * Copyright (c) 2010 Broadcom Corporation
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
 * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/kthread.h>
#include <linux/slab.h>
#include <linux/skbuff.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/mmc/sdio_func.h>
#include <linux/random.h>
#include <linux/spinlock.h>
#include <linux/ethtool.h>
#include <linux/fcntl.h>
#include <linux/fs.h>
#include <linux/uaccess.h>
#include <linux/hardirq.h>
#include <linux/mutex.h>
#include <linux/wait.h>
#include <linux/module.h>
#include <net/cfg80211.h>
#include <net/rtnetlink.h>
#include <defs.h>
#include <brcmu_utils.h>
#include <brcmu_wifi.h>

#include "dhd.h"
#include "dhd_bus.h"
#include "dhd_proto.h"
#include "dhd_dbg.h"
#include "wl_cfg80211.h"

MODULE_AUTHOR("Broadcom Corporation");
MODULE_DESCRIPTION("Broadcom 802.11n wireless LAN fullmac driver.");
MODULE_SUPPORTED_DEVICE("Broadcom 802.11n WLAN fullmac cards");
MODULE_LICENSE("Dual BSD/GPL");


/* Interface control information */
struct brcmf_if {
    struct brcmf_pub *drvr; /* back pointer to brcmf_pub */
    /* OS/stack specifics */
    struct net_device *ndev;
    struct net_device_stats stats;
    int idx;        /* iface idx in dongle */
    u8 mac_addr[ETH_ALEN];  /* assigned MAC address */
};

/* Error bits */
int brcmf_msg_level = BRCMF_ERROR_VAL;
module_param(brcmf_msg_level, int, 0);

int brcmf_ifname2idx(struct brcmf_pub *drvr, char *name)
{
    int i = BRCMF_MAX_IFS;
    struct brcmf_if *ifp;

    if (name == NULL || *name == '\0')
        return 0;

    while (--i > 0) {
        ifp = drvr->iflist[i];
        if (ifp && !strncmp(ifp->ndev->name, name, IFNAMSIZ))
            break;
    }

    brcmf_dbg(TRACE, "return idx %d for \"%s\"\n", i, name);

    return i;       /* default - the primary interface */
}

char *brcmf_ifname(struct brcmf_pub *drvr, int ifidx)
{
    if (ifidx < 0 || ifidx >= BRCMF_MAX_IFS) {
        brcmf_dbg(ERROR, "ifidx %d out of range\n", ifidx);
        return "<if_bad>";
    }

    if (drvr->iflist[ifidx] == NULL) {
        brcmf_dbg(ERROR, "null i/f %d\n", ifidx);
        return "<if_null>";
    }

    if (drvr->iflist[ifidx]->ndev)
        return drvr->iflist[ifidx]->ndev->name;

    return "<if_none>";
}

static void _brcmf_set_multicast_list(struct work_struct *work)
{
    struct net_device *ndev;
    struct netdev_hw_addr *ha;
    u32 dcmd_value, cnt;
    __le32 cnt_le;
    __le32 dcmd_le_value;

    struct brcmf_dcmd dcmd;
    char *buf, *bufp;
    uint buflen;
    int ret;

    struct brcmf_pub *drvr = container_of(work, struct brcmf_pub,
                            multicast_work);

    ndev = drvr->iflist[0]->ndev;
    cnt = netdev_mc_count(ndev);

    /* Determine initial value of allmulti flag */
    dcmd_value = (ndev->flags & IFF_ALLMULTI) ? true : false;

    /* Send down the multicast list first. */

    buflen = sizeof("mcast_list") + sizeof(cnt) + (cnt * ETH_ALEN);
    bufp = buf = kmalloc(buflen, GFP_ATOMIC);
    if (!bufp)
        return;

    strcpy(bufp, "mcast_list");
    bufp += strlen("mcast_list") + 1;

    cnt_le = cpu_to_le32(cnt);
    memcpy(bufp, &cnt_le, sizeof(cnt));
    bufp += sizeof(cnt_le);

    netdev_for_each_mc_addr(ha, ndev) {
        if (!cnt)
            break;
        memcpy(bufp, ha->addr, ETH_ALEN);
        bufp += ETH_ALEN;
        cnt--;
    }

    memset(&dcmd, 0, sizeof(dcmd));
    dcmd.cmd = BRCMF_C_SET_VAR;
    dcmd.buf = buf;
    dcmd.len = buflen;
    dcmd.set = true;

    ret = brcmf_proto_dcmd(drvr, 0, &dcmd, dcmd.len);
    if (ret < 0) {
        brcmf_dbg(ERROR, "%s: set mcast_list failed, cnt %d\n",
              brcmf_ifname(drvr, 0), cnt);
        dcmd_value = cnt ? true : dcmd_value;
    }

    kfree(buf);

    /* Now send the allmulti setting.  This is based on the setting in the
     * net_device flags, but might be modified above to be turned on if we
     * were trying to set some addresses and dongle rejected it...
     */

    buflen = sizeof("allmulti") + sizeof(dcmd_value);
    buf = kmalloc(buflen, GFP_ATOMIC);
    if (!buf)
        return;

    dcmd_le_value = cpu_to_le32(dcmd_value);

    if (!brcmf_c_mkiovar
        ("allmulti", (void *)&dcmd_le_value,
        sizeof(dcmd_le_value), buf, buflen)) {
        brcmf_dbg(ERROR, "%s: mkiovar failed for allmulti, datalen %d buflen %u\n",
              brcmf_ifname(drvr, 0),
              (int)sizeof(dcmd_value), buflen);
        kfree(buf);
        return;
    }

    memset(&dcmd, 0, sizeof(dcmd));
    dcmd.cmd = BRCMF_C_SET_VAR;
    dcmd.buf = buf;
    dcmd.len = buflen;
    dcmd.set = true;

    ret = brcmf_proto_dcmd(drvr, 0, &dcmd, dcmd.len);
    if (ret < 0) {
        brcmf_dbg(ERROR, "%s: set allmulti %d failed\n",
              brcmf_ifname(drvr, 0),
              le32_to_cpu(dcmd_le_value));
    }

    kfree(buf);

    /* Finally, pick up the PROMISC flag as well, like the NIC
         driver does */

    dcmd_value = (ndev->flags & IFF_PROMISC) ? true : false;
    dcmd_le_value = cpu_to_le32(dcmd_value);

    memset(&dcmd, 0, sizeof(dcmd));
    dcmd.cmd = BRCMF_C_SET_PROMISC;
    dcmd.buf = &dcmd_le_value;
    dcmd.len = sizeof(dcmd_le_value);
    dcmd.set = true;

    ret = brcmf_proto_dcmd(drvr, 0, &dcmd, dcmd.len);
    if (ret < 0) {
        brcmf_dbg(ERROR, "%s: set promisc %d failed\n",
              brcmf_ifname(drvr, 0),
              le32_to_cpu(dcmd_le_value));
    }
}

static void
_brcmf_set_mac_address(struct work_struct *work)
{
    char buf[32];
    struct brcmf_dcmd dcmd;
    int ret;

    struct brcmf_pub *drvr = container_of(work, struct brcmf_pub,
                            setmacaddr_work);

    brcmf_dbg(TRACE, "enter\n");
    if (!brcmf_c_mkiovar("cur_etheraddr", (char *)drvr->macvalue,
               ETH_ALEN, buf, 32)) {
        brcmf_dbg(ERROR, "%s: mkiovar failed for cur_etheraddr\n",
              brcmf_ifname(drvr, 0));
        return;
    }
    memset(&dcmd, 0, sizeof(dcmd));
    dcmd.cmd = BRCMF_C_SET_VAR;
    dcmd.buf = buf;
    dcmd.len = 32;
    dcmd.set = true;

    ret = brcmf_proto_dcmd(drvr, 0, &dcmd, dcmd.len);
    if (ret < 0)
        brcmf_dbg(ERROR, "%s: set cur_etheraddr failed\n",
              brcmf_ifname(drvr, 0));
    else
        memcpy(drvr->iflist[0]->ndev->dev_addr,
               drvr->macvalue, ETH_ALEN);

    return;
}

static int brcmf_netdev_set_mac_address(struct net_device *ndev, void *addr)
{
    struct brcmf_if *ifp = netdev_priv(ndev);
    struct brcmf_pub *drvr = ifp->drvr;
    struct sockaddr *sa = (struct sockaddr *)addr;

    memcpy(&drvr->macvalue, sa->sa_data, ETH_ALEN);
    schedule_work(&drvr->setmacaddr_work);
    return 0;
}

static void brcmf_netdev_set_multicast_list(struct net_device *ndev)
{
    struct brcmf_if *ifp = netdev_priv(ndev);
    struct brcmf_pub *drvr = ifp->drvr;

    schedule_work(&drvr->multicast_work);
}

static int brcmf_netdev_start_xmit(struct sk_buff *skb, struct net_device *ndev)
{
    int ret;
    struct brcmf_if *ifp = netdev_priv(ndev);
    struct brcmf_pub *drvr = ifp->drvr;

    brcmf_dbg(TRACE, "Enter\n");

    /* Reject if down */
    if (!drvr->bus_if->drvr_up ||
        (drvr->bus_if->state == BRCMF_BUS_DOWN)) {
        brcmf_dbg(ERROR, "xmit rejected drvup=%d state=%d\n",
              drvr->bus_if->drvr_up,
              drvr->bus_if->state);
        netif_stop_queue(ndev);
        return -ENODEV;
    }

    if (!drvr->iflist[ifp->idx]) {
        brcmf_dbg(ERROR, "bad ifidx %d\n", ifp->idx);
        netif_stop_queue(ndev);
        return -ENODEV;
    }

    /* Make sure there's enough room for any header */
    if (skb_headroom(skb) < drvr->hdrlen) {
        struct sk_buff *skb2;

        brcmf_dbg(INFO, "%s: insufficient headroom\n",
              brcmf_ifname(drvr, ifp->idx));
        drvr->bus_if->tx_realloc++;
        skb2 = skb_realloc_headroom(skb, drvr->hdrlen);
        dev_kfree_skb(skb);
        skb = skb2;
        if (skb == NULL) {
            brcmf_dbg(ERROR, "%s: skb_realloc_headroom failed\n",
                  brcmf_ifname(drvr, ifp->idx));
            ret = -ENOMEM;
            goto done;
        }
    }

    /* Update multicast statistic */
    if (skb->len >= ETH_ALEN) {
        u8 *pktdata = (u8 *)(skb->data);
        struct ethhdr *eh = (struct ethhdr *)pktdata;

        if (is_multicast_ether_addr(eh->h_dest))
            drvr->tx_multicast++;
        if (ntohs(eh->h_proto) == ETH_P_PAE)
            atomic_inc(&drvr->pend_8021x_cnt);
    }

    /* If the protocol uses a data header, apply it */
    brcmf_proto_hdrpush(drvr, ifp->idx, skb);

    /* Use bus module to send data frame */
    ret =  drvr->bus_if->brcmf_bus_txdata(drvr->dev, skb);

done:
    if (ret)
        drvr->bus_if->dstats.tx_dropped++;
    else
        drvr->bus_if->dstats.tx_packets++;

    /* Return ok: we always eat the packet */
    return 0;
}

void brcmf_txflowblock(struct device *dev, bool state)
{
    struct net_device *ndev;
    struct brcmf_bus *bus_if = dev_get_drvdata(dev);
    struct brcmf_pub *drvr = bus_if->drvr;
    int i;

    brcmf_dbg(TRACE, "Enter\n");

    for (i = 0; i < BRCMF_MAX_IFS; i++)
        if (drvr->iflist[i]) {
            ndev = drvr->iflist[i]->ndev;
            if (state)
                netif_stop_queue(ndev);
            else
                netif_wake_queue(ndev);
        }
}

static int brcmf_host_event(struct brcmf_pub *drvr, int *ifidx,
                void *pktdata, struct brcmf_event_msg *event,
                void **data)
{
    int bcmerror = 0;

    bcmerror = brcmf_c_host_event(drvr, ifidx, pktdata, event, data);
    if (bcmerror != 0)
        return bcmerror;

    if (drvr->iflist[*ifidx]->ndev)
        brcmf_cfg80211_event(drvr->iflist[*ifidx]->ndev,
                     event, *data);

    return bcmerror;
}

void brcmf_rx_frame(struct device *dev, int ifidx,
            struct sk_buff_head *skb_list)
{
    unsigned char *eth;
    uint len;
    void *data;
    struct sk_buff *skb, *pnext;
    struct brcmf_if *ifp;
    struct brcmf_event_msg event;
    struct brcmf_bus *bus_if = dev_get_drvdata(dev);
    struct brcmf_pub *drvr = bus_if->drvr;

    brcmf_dbg(TRACE, "Enter\n");

    skb_queue_walk_safe(skb_list, skb, pnext) {
        skb_unlink(skb, skb_list);

        /* Get the protocol, maintain skb around eth_type_trans()
         * The main reason for this hack is for the limitation of
         * Linux 2.4 where 'eth_type_trans' uses the
         * 'net->hard_header_len'
         * to perform skb_pull inside vs ETH_HLEN. Since to avoid
         * coping of the packet coming from the network stack to add
         * BDC, Hardware header etc, during network interface
         * registration
         * we set the 'net->hard_header_len' to ETH_HLEN + extra space
         * required
         * for BDC, Hardware header etc. and not just the ETH_HLEN
         */
        eth = skb->data;
        len = skb->len;

        ifp = drvr->iflist[ifidx];
        if (ifp == NULL)
            ifp = drvr->iflist[0];

        if (!ifp || !ifp->ndev ||
            ifp->ndev->reg_state != NETREG_REGISTERED) {
            brcmu_pkt_buf_free_skb(skb);
            continue;
        }

        skb->dev = ifp->ndev;
        skb->protocol = eth_type_trans(skb, skb->dev);

        if (skb->pkt_type == PACKET_MULTICAST)
            bus_if->dstats.multicast++;

        skb->data = eth;
        skb->len = len;

        /* Strip header, count, deliver upward */
        skb_pull(skb, ETH_HLEN);

        /* Process special event packets and then discard them */
        if (ntohs(skb->protocol) == ETH_P_LINK_CTL)
            brcmf_host_event(drvr, &ifidx,
                      skb_mac_header(skb),
                      &event, &data);

        if (drvr->iflist[ifidx]) {
            ifp = drvr->iflist[ifidx];
            ifp->ndev->last_rx = jiffies;
        }

        bus_if->dstats.rx_bytes += skb->len;
        bus_if->dstats.rx_packets++;    /* Local count */

        if (in_interrupt())
            netif_rx(skb);
        else
            /* If the receive is not processed inside an ISR,
             * the softirqd must be woken explicitly to service
             * the NET_RX_SOFTIRQ.  In 2.6 kernels, this is handled
             * by netif_rx_ni(), but in earlier kernels, we need
             * to do it manually.
             */
            netif_rx_ni(skb);
    }
}

void brcmf_txcomplete(struct device *dev, struct sk_buff *txp, bool success)
{
    uint ifidx;
    struct ethhdr *eh;
    u16 type;
    struct brcmf_bus *bus_if = dev_get_drvdata(dev);
    struct brcmf_pub *drvr = bus_if->drvr;

    brcmf_proto_hdrpull(dev, &ifidx, txp);

    eh = (struct ethhdr *)(txp->data);
    type = ntohs(eh->h_proto);

    if (type == ETH_P_PAE)
        atomic_dec(&drvr->pend_8021x_cnt);

}

static struct net_device_stats *brcmf_netdev_get_stats(struct net_device *ndev)
{
    struct brcmf_if *ifp = netdev_priv(ndev);
    struct brcmf_bus *bus_if = ifp->drvr->bus_if;

    brcmf_dbg(TRACE, "Enter\n");

    /* Copy dongle stats to net device stats */
    ifp->stats.rx_packets = bus_if->dstats.rx_packets;
    ifp->stats.tx_packets = bus_if->dstats.tx_packets;
    ifp->stats.rx_bytes = bus_if->dstats.rx_bytes;
    ifp->stats.tx_bytes = bus_if->dstats.tx_bytes;
    ifp->stats.rx_errors = bus_if->dstats.rx_errors;
    ifp->stats.tx_errors = bus_if->dstats.tx_errors;
    ifp->stats.rx_dropped = bus_if->dstats.rx_dropped;
    ifp->stats.tx_dropped = bus_if->dstats.tx_dropped;
    ifp->stats.multicast = bus_if->dstats.multicast;

    return &ifp->stats;
}

/* Retrieve current toe component enables, which are kept
     as a bitmap in toe_ol iovar */
static int brcmf_toe_get(struct brcmf_pub *drvr, int ifidx, u32 *toe_ol)
{
    struct brcmf_dcmd dcmd;
    __le32 toe_le;
    char buf[32];
    int ret;

    memset(&dcmd, 0, sizeof(dcmd));

    dcmd.cmd = BRCMF_C_GET_VAR;
    dcmd.buf = buf;
    dcmd.len = (uint) sizeof(buf);
    dcmd.set = false;

    strcpy(buf, "toe_ol");
    ret = brcmf_proto_dcmd(drvr, ifidx, &dcmd, dcmd.len);
    if (ret < 0) {
        /* Check for older dongle image that doesn't support toe_ol */
        if (ret == -EIO) {
            brcmf_dbg(ERROR, "%s: toe not supported by device\n",
                  brcmf_ifname(drvr, ifidx));
            return -EOPNOTSUPP;
        }

        brcmf_dbg(INFO, "%s: could not get toe_ol: ret=%d\n",
              brcmf_ifname(drvr, ifidx), ret);
        return ret;
    }

    memcpy(&toe_le, buf, sizeof(u32));
    *toe_ol = le32_to_cpu(toe_le);
    return 0;
}

/* Set current toe component enables in toe_ol iovar,
     and set toe global enable iovar */
static int brcmf_toe_set(struct brcmf_pub *drvr, int ifidx, u32 toe_ol)
{
    struct brcmf_dcmd dcmd;
    char buf[32];
    int ret;
    __le32 toe_le = cpu_to_le32(toe_ol);

    memset(&dcmd, 0, sizeof(dcmd));

    dcmd.cmd = BRCMF_C_SET_VAR;
    dcmd.buf = buf;
    dcmd.len = (uint) sizeof(buf);
    dcmd.set = true;

    /* Set toe_ol as requested */
    strcpy(buf, "toe_ol");
    memcpy(&buf[sizeof("toe_ol")], &toe_le, sizeof(u32));

    ret = brcmf_proto_dcmd(drvr, ifidx, &dcmd, dcmd.len);
    if (ret < 0) {
        brcmf_dbg(ERROR, "%s: could not set toe_ol: ret=%d\n",
              brcmf_ifname(drvr, ifidx), ret);
        return ret;
    }

    /* Enable toe globally only if any components are enabled. */
    toe_le = cpu_to_le32(toe_ol != 0);

    strcpy(buf, "toe");
    memcpy(&buf[sizeof("toe")], &toe_le, sizeof(u32));

    ret = brcmf_proto_dcmd(drvr, ifidx, &dcmd, dcmd.len);
    if (ret < 0) {
        brcmf_dbg(ERROR, "%s: could not set toe: ret=%d\n",
              brcmf_ifname(drvr, ifidx), ret);
        return ret;
    }

    return 0;
}

static void brcmf_ethtool_get_drvinfo(struct net_device *ndev,
                    struct ethtool_drvinfo *info)
{
    struct brcmf_if *ifp = netdev_priv(ndev);
    struct brcmf_pub *drvr = ifp->drvr;

    sprintf(info->driver, KBUILD_MODNAME);
    sprintf(info->version, "%lu", drvr->drv_version);
    sprintf(info->bus_info, "%s", dev_name(drvr->dev));
}

static const struct ethtool_ops brcmf_ethtool_ops = {
    .get_drvinfo = brcmf_ethtool_get_drvinfo,
};

static int brcmf_ethtool(struct brcmf_pub *drvr, void __user *uaddr)
{
    struct ethtool_drvinfo info;
    char drvname[sizeof(info.driver)];
    u32 cmd;
    struct ethtool_value edata;
    u32 toe_cmpnt, csum_dir;
    int ret;

    brcmf_dbg(TRACE, "Enter\n");

    /* all ethtool calls start with a cmd word */
    if (copy_from_user(&cmd, uaddr, sizeof(u32)))
        return -EFAULT;

    switch (cmd) {
    case ETHTOOL_GDRVINFO:
        /* Copy out any request driver name */
        if (copy_from_user(&info, uaddr, sizeof(info)))
            return -EFAULT;
        strncpy(drvname, info.driver, sizeof(info.driver));
        drvname[sizeof(info.driver) - 1] = '\0';

        /* clear struct for return */
        memset(&info, 0, sizeof(info));
        info.cmd = cmd;

        /* if requested, identify ourselves */
        if (strcmp(drvname, "?dhd") == 0) {
            sprintf(info.driver, "dhd");
            strcpy(info.version, BRCMF_VERSION_STR);
        }

        /* otherwise, require dongle to be up */
        else if (!drvr->bus_if->drvr_up) {
            brcmf_dbg(ERROR, "dongle is not up\n");
            return -ENODEV;
        }

        /* finally, report dongle driver type */
        else if (drvr->iswl)
            sprintf(info.driver, "wl");
        else
            sprintf(info.driver, "xx");

        sprintf(info.version, "%lu", drvr->drv_version);
        if (copy_to_user(uaddr, &info, sizeof(info)))
            return -EFAULT;
        brcmf_dbg(CTL, "given %*s, returning %s\n",
              (int)sizeof(drvname), drvname, info.driver);
        break;

        /* Get toe offload components from dongle */
    case ETHTOOL_GRXCSUM:
    case ETHTOOL_GTXCSUM:
        ret = brcmf_toe_get(drvr, 0, &toe_cmpnt);
        if (ret < 0)
            return ret;

        csum_dir =
            (cmd == ETHTOOL_GTXCSUM) ? TOE_TX_CSUM_OL : TOE_RX_CSUM_OL;

        edata.cmd = cmd;
        edata.data = (toe_cmpnt & csum_dir) ? 1 : 0;

        if (copy_to_user(uaddr, &edata, sizeof(edata)))
            return -EFAULT;
        break;

        /* Set toe offload components in dongle */
    case ETHTOOL_SRXCSUM:
    case ETHTOOL_STXCSUM:
        if (copy_from_user(&edata, uaddr, sizeof(edata)))
            return -EFAULT;

        /* Read the current settings, update and write back */
        ret = brcmf_toe_get(drvr, 0, &toe_cmpnt);
        if (ret < 0)
            return ret;

        csum_dir =
            (cmd == ETHTOOL_STXCSUM) ? TOE_TX_CSUM_OL : TOE_RX_CSUM_OL;

        if (edata.data != 0)
            toe_cmpnt |= csum_dir;
        else
            toe_cmpnt &= ~csum_dir;

        ret = brcmf_toe_set(drvr, 0, toe_cmpnt);
        if (ret < 0)
            return ret;

        /* If setting TX checksum mode, tell Linux the new mode */
        if (cmd == ETHTOOL_STXCSUM) {
            if (edata.data)
                drvr->iflist[0]->ndev->features |=
                    NETIF_F_IP_CSUM;
            else
                drvr->iflist[0]->ndev->features &=
                    ~NETIF_F_IP_CSUM;
        }

        break;

    default:
        return -EOPNOTSUPP;
    }

    return 0;
}

static int brcmf_netdev_ioctl_entry(struct net_device *ndev, struct ifreq *ifr,
                    int cmd)
{
    struct brcmf_if *ifp = netdev_priv(ndev);
    struct brcmf_pub *drvr = ifp->drvr;

    brcmf_dbg(TRACE, "ifidx %d, cmd 0x%04x\n", ifp->idx, cmd);

    if (!drvr->iflist[ifp->idx])
        return -1;

    if (cmd == SIOCETHTOOL)
        return brcmf_ethtool(drvr, ifr->ifr_data);

    return -EOPNOTSUPP;
}

/* called only from within this driver. Sends a command to the dongle. */
s32 brcmf_exec_dcmd(struct net_device *ndev, u32 cmd, void *arg, u32 len)
{
    struct brcmf_dcmd dcmd;
    s32 err = 0;
    int buflen = 0;
    bool is_set_key_cmd;
    struct brcmf_if *ifp = netdev_priv(ndev);
    struct brcmf_pub *drvr = ifp->drvr;

    memset(&dcmd, 0, sizeof(dcmd));
    dcmd.cmd = cmd;
    dcmd.buf = arg;
    dcmd.len = len;

    if (dcmd.buf != NULL)
        buflen = min_t(uint, dcmd.len, BRCMF_DCMD_MAXLEN);

    /* send to dongle (must be up, and wl) */
    if ((drvr->bus_if->state != BRCMF_BUS_DATA)) {
        brcmf_dbg(ERROR, "DONGLE_DOWN\n");
        err = -EIO;
        goto done;
    }

    if (!drvr->iswl) {
        err = -EIO;
        goto done;
    }

    /*
     * Intercept BRCMF_C_SET_KEY CMD - serialize M4 send and
     * set key CMD to prevent M4 encryption.
     */
    is_set_key_cmd = ((dcmd.cmd == BRCMF_C_SET_KEY) ||
              ((dcmd.cmd == BRCMF_C_SET_VAR) &&
               !(strncmp("wsec_key", dcmd.buf, 9))) ||
              ((dcmd.cmd == BRCMF_C_SET_VAR) &&
               !(strncmp("bsscfg:wsec_key", dcmd.buf, 15))));
    if (is_set_key_cmd)
        brcmf_netdev_wait_pend8021x(ndev);

    err = brcmf_proto_dcmd(drvr, ifp->idx, &dcmd, buflen);

done:
    if (err > 0)
        err = 0;

    return err;
}

int brcmf_netlink_dcmd(struct net_device *ndev, struct brcmf_dcmd *dcmd)
{
    brcmf_dbg(TRACE, "enter: cmd %x buf %p len %d\n",
          dcmd->cmd, dcmd->buf, dcmd->len);

    return brcmf_exec_dcmd(ndev, dcmd->cmd, dcmd->buf, dcmd->len);
}

static int brcmf_netdev_stop(struct net_device *ndev)
{
    struct brcmf_if *ifp = netdev_priv(ndev);
    struct brcmf_pub *drvr = ifp->drvr;

    brcmf_dbg(TRACE, "Enter\n");
    brcmf_cfg80211_down(drvr->config);
    if (drvr->bus_if->drvr_up == 0)
        return 0;

    /* Set state and stop OS transmissions */
    drvr->bus_if->drvr_up = false;
    netif_stop_queue(ndev);

    return 0;
}

static int brcmf_netdev_open(struct net_device *ndev)
{
    struct brcmf_if *ifp = netdev_priv(ndev);
    struct brcmf_pub *drvr = ifp->drvr;
    struct brcmf_bus *bus_if = drvr->bus_if;
    u32 toe_ol;
    s32 ret = 0;
    uint up = 0;

    brcmf_dbg(TRACE, "ifidx %d\n", ifp->idx);

    if (ifp->idx == 0) {    /* do it only for primary eth0 */
        /* If bus is not ready, can't continue */
        if (bus_if->state != BRCMF_BUS_DATA) {
            brcmf_dbg(ERROR, "failed bus is not ready\n");
            return -EAGAIN;
        }

        atomic_set(&drvr->pend_8021x_cnt, 0);

        memcpy(ndev->dev_addr, drvr->mac, ETH_ALEN);

        /* Get current TOE mode from dongle */
        if (brcmf_toe_get(drvr, ifp->idx, &toe_ol) >= 0
            && (toe_ol & TOE_TX_CSUM_OL) != 0)
            drvr->iflist[ifp->idx]->ndev->features |=
                NETIF_F_IP_CSUM;
        else
            drvr->iflist[ifp->idx]->ndev->features &=
                ~NETIF_F_IP_CSUM;
    }

    /* make sure RF is ready for work */
    brcmf_proto_cdc_set_dcmd(drvr, 0, BRCMF_C_UP, (char *)&up, sizeof(up));

    /* Allow transmit calls */
    netif_start_queue(ndev);
    drvr->bus_if->drvr_up = true;
    if (brcmf_cfg80211_up(drvr->config)) {
        brcmf_dbg(ERROR, "failed to bring up cfg80211\n");
        return -1;
    }

    return ret;
}

static const struct net_device_ops brcmf_netdev_ops_pri = {
    .ndo_open = brcmf_netdev_open,
    .ndo_stop = brcmf_netdev_stop,
    .ndo_get_stats = brcmf_netdev_get_stats,
    .ndo_do_ioctl = brcmf_netdev_ioctl_entry,
    .ndo_start_xmit = brcmf_netdev_start_xmit,
    .ndo_set_mac_address = brcmf_netdev_set_mac_address,
    .ndo_set_rx_mode = brcmf_netdev_set_multicast_list
};

static int brcmf_net_attach(struct brcmf_if *ifp)
{
    struct brcmf_pub *drvr = ifp->drvr;
    struct net_device *ndev;
    u8 temp_addr[ETH_ALEN];

    brcmf_dbg(TRACE, "ifidx %d\n", ifp->idx);

    ndev = drvr->iflist[ifp->idx]->ndev;
    ndev->netdev_ops = &brcmf_netdev_ops_pri;

    /*
     * determine mac address to use
     */
    if (is_valid_ether_addr(ifp->mac_addr))
        memcpy(temp_addr, ifp->mac_addr, ETH_ALEN);
    else
        memcpy(temp_addr, drvr->mac, ETH_ALEN);

    if (ifp->idx == 1) {
        brcmf_dbg(TRACE, "ACCESS POINT MAC:\n");
        /*  ACCESSPOINT INTERFACE CASE */
        temp_addr[0] |= 0X02;   /* set bit 2 ,
             - Locally Administered address  */

    }
    ndev->hard_header_len = ETH_HLEN + drvr->hdrlen;
    ndev->ethtool_ops = &brcmf_ethtool_ops;

    drvr->rxsz = ndev->mtu + ndev->hard_header_len +
                  drvr->hdrlen;

    memcpy(ndev->dev_addr, temp_addr, ETH_ALEN);

    /* attach to cfg80211 for primary interface */
    if (!ifp->idx) {
        drvr->config = brcmf_cfg80211_attach(ndev, drvr->dev, drvr);
        if (drvr->config == NULL) {
            brcmf_dbg(ERROR, "wl_cfg80211_attach failed\n");
            goto fail;
        }
    }

    if (register_netdev(ndev) != 0) {
        brcmf_dbg(ERROR, "couldn't register the net device\n");
        goto fail;
    }

    brcmf_dbg(INFO, "%s: Broadcom Dongle Host Driver\n", ndev->name);

    return 0;

fail:
    ndev->netdev_ops = NULL;
    return -EBADE;
}

int
brcmf_add_if(struct device *dev, int ifidx, char *name, u8 *mac_addr)
{
    struct brcmf_if *ifp;
    struct net_device *ndev;
    struct brcmf_bus *bus_if = dev_get_drvdata(dev);
    struct brcmf_pub *drvr = bus_if->drvr;

    brcmf_dbg(TRACE, "idx %d\n", ifidx);

    ifp = drvr->iflist[ifidx];
    /*
     * Delete the existing interface before overwriting it
     * in case we missed the BRCMF_E_IF_DEL event.
     */
    if (ifp) {
        brcmf_dbg(ERROR, "ERROR: netdev:%s already exists, try free & unregister\n",
              ifp->ndev->name);
        netif_stop_queue(ifp->ndev);
        unregister_netdev(ifp->ndev);
        free_netdev(ifp->ndev);
        drvr->iflist[ifidx] = NULL;
    }

    /* Allocate netdev, including space for private structure */
    ndev = alloc_netdev(sizeof(struct brcmf_if), name, ether_setup);
    if (!ndev) {
        brcmf_dbg(ERROR, "OOM - alloc_netdev\n");
        return -ENOMEM;
    }

    ifp = netdev_priv(ndev);
    ifp->ndev = ndev;
    ifp->drvr = drvr;
    drvr->iflist[ifidx] = ifp;
    ifp->idx = ifidx;
    if (mac_addr != NULL)
        memcpy(&ifp->mac_addr, mac_addr, ETH_ALEN);

    if (brcmf_net_attach(ifp)) {
        brcmf_dbg(ERROR, "brcmf_net_attach failed");
        free_netdev(ifp->ndev);
        drvr->iflist[ifidx] = NULL;
        return -EOPNOTSUPP;
    }

    brcmf_dbg(TRACE, " ==== pid:%x, net_device for if:%s created ===\n",
          current->pid, ifp->ndev->name);

    return 0;
}

void brcmf_del_if(struct brcmf_pub *drvr, int ifidx)
{
    struct brcmf_if *ifp;

    brcmf_dbg(TRACE, "idx %d\n", ifidx);

    ifp = drvr->iflist[ifidx];
    if (!ifp) {
        brcmf_dbg(ERROR, "Null interface\n");
        return;
    }
    if (ifp->ndev) {
        if (ifidx == 0) {
            if (ifp->ndev->netdev_ops == &brcmf_netdev_ops_pri) {
                rtnl_lock();
                brcmf_netdev_stop(ifp->ndev);
                rtnl_unlock();
            }
        } else {
            netif_stop_queue(ifp->ndev);
        }

        unregister_netdev(ifp->ndev);
        drvr->iflist[ifidx] = NULL;
        if (ifidx == 0)
            brcmf_cfg80211_detach(drvr->config);
        free_netdev(ifp->ndev);
    }
}

int brcmf_attach(uint bus_hdrlen, struct device *dev)
{
    struct brcmf_pub *drvr = NULL;
    int ret = 0;

    brcmf_dbg(TRACE, "Enter\n");

    /* Allocate primary brcmf_info */
    drvr = kzalloc(sizeof(struct brcmf_pub), GFP_ATOMIC);
    if (!drvr)
        return -ENOMEM;

    mutex_init(&drvr->proto_block);

    /* Link to bus module */
    drvr->hdrlen = bus_hdrlen;
    drvr->bus_if = dev_get_drvdata(dev);
    drvr->bus_if->drvr = drvr;
    drvr->dev = dev;

    /* create device debugfs folder */
    brcmf_debugfs_attach(drvr);

    /* Attach and link in the protocol */
    ret = brcmf_proto_attach(drvr);
    if (ret != 0) {
        brcmf_dbg(ERROR, "brcmf_prot_attach failed\n");
        goto fail;
    }

    INIT_WORK(&drvr->setmacaddr_work, _brcmf_set_mac_address);
    INIT_WORK(&drvr->multicast_work, _brcmf_set_multicast_list);

    INIT_LIST_HEAD(&drvr->bus_if->dcmd_list);

    return ret;

fail:
    brcmf_detach(dev);

    return ret;
}

int brcmf_bus_start(struct device *dev)
{
    int ret = -1;
    /* Room for "event_msgs" + '\0' + bitvec */
    char iovbuf[BRCMF_EVENTING_MASK_LEN + 12];
    struct brcmf_bus *bus_if = dev_get_drvdata(dev);
    struct brcmf_pub *drvr = bus_if->drvr;

    brcmf_dbg(TRACE, "\n");

    /* Bring up the bus */
    ret = bus_if->brcmf_bus_init(dev);
    if (ret != 0) {
        brcmf_dbg(ERROR, "brcmf_sdbrcm_bus_init failed %d\n", ret);
        return ret;
    }

    brcmf_c_mkiovar("event_msgs", drvr->eventmask, BRCMF_EVENTING_MASK_LEN,
              iovbuf, sizeof(iovbuf));
    brcmf_proto_cdc_query_dcmd(drvr, 0, BRCMF_C_GET_VAR, iovbuf,
                    sizeof(iovbuf));
    memcpy(drvr->eventmask, iovbuf, BRCMF_EVENTING_MASK_LEN);

    setbit(drvr->eventmask, BRCMF_E_SET_SSID);
    setbit(drvr->eventmask, BRCMF_E_PRUNE);
    setbit(drvr->eventmask, BRCMF_E_AUTH);
    setbit(drvr->eventmask, BRCMF_E_REASSOC);
    setbit(drvr->eventmask, BRCMF_E_REASSOC_IND);
    setbit(drvr->eventmask, BRCMF_E_DEAUTH_IND);
    setbit(drvr->eventmask, BRCMF_E_DISASSOC_IND);
    setbit(drvr->eventmask, BRCMF_E_DISASSOC);
    setbit(drvr->eventmask, BRCMF_E_JOIN);
    setbit(drvr->eventmask, BRCMF_E_ASSOC_IND);
    setbit(drvr->eventmask, BRCMF_E_PSK_SUP);
    setbit(drvr->eventmask, BRCMF_E_LINK);
    setbit(drvr->eventmask, BRCMF_E_NDIS_LINK);
    setbit(drvr->eventmask, BRCMF_E_MIC_ERROR);
    setbit(drvr->eventmask, BRCMF_E_PMKID_CACHE);
    setbit(drvr->eventmask, BRCMF_E_TXFAIL);
    setbit(drvr->eventmask, BRCMF_E_JOIN_START);
    setbit(drvr->eventmask, BRCMF_E_SCAN_COMPLETE);

/* enable dongle roaming event */

    drvr->pktfilter_count = 1;
    /* Setup filter to allow only unicast */
    drvr->pktfilter[0] = "100 0 0 0 0x01 0x00";

    /* Bus is ready, do any protocol initialization */
    ret = brcmf_proto_init(drvr);
    if (ret < 0)
        return ret;

    /* add primary networking interface */
    ret = brcmf_add_if(dev, 0, "wlan%d", drvr->mac);
    if (ret < 0)
        return ret;

    /* signal bus ready */
    bus_if->state = BRCMF_BUS_DATA;
    return 0;
}

static void brcmf_bus_detach(struct brcmf_pub *drvr)
{
    brcmf_dbg(TRACE, "Enter\n");

    if (drvr) {
        /* Stop the protocol module */
        brcmf_proto_stop(drvr);

        /* Stop the bus module */
        drvr->bus_if->brcmf_bus_stop(drvr->dev);
    }
}

void brcmf_detach(struct device *dev)
{
    int i;
    struct brcmf_bus *bus_if = dev_get_drvdata(dev);
    struct brcmf_pub *drvr = bus_if->drvr;

    brcmf_dbg(TRACE, "Enter\n");


    /* make sure primary interface removed last */
    for (i = BRCMF_MAX_IFS-1; i > -1; i--)
        if (drvr->iflist[i])
            brcmf_del_if(drvr, i);

    brcmf_bus_detach(drvr);

    if (drvr->prot) {
        cancel_work_sync(&drvr->setmacaddr_work);
        cancel_work_sync(&drvr->multicast_work);
        brcmf_proto_detach(drvr);
    }

    brcmf_debugfs_detach(drvr);
    bus_if->drvr = NULL;
    kfree(drvr);
}

static int brcmf_get_pend_8021x_cnt(struct brcmf_pub *drvr)
{
    return atomic_read(&drvr->pend_8021x_cnt);
}

#define MAX_WAIT_FOR_8021X_TX   10

int brcmf_netdev_wait_pend8021x(struct net_device *ndev)
{
    struct brcmf_if *ifp = netdev_priv(ndev);
    struct brcmf_pub *drvr = ifp->drvr;
    int timeout = 10 * HZ / 1000;
    int ntimes = MAX_WAIT_FOR_8021X_TX;
    int pend = brcmf_get_pend_8021x_cnt(drvr);

    while (ntimes && pend) {
        if (pend) {
            set_current_state(TASK_INTERRUPTIBLE);
            schedule_timeout(timeout);
            set_current_state(TASK_RUNNING);
            ntimes--;
        }
        pend = brcmf_get_pend_8021x_cnt(drvr);
    }
    return pend;
}

#ifdef DEBUG
int brcmf_write_to_file(struct brcmf_pub *drvr, const u8 *buf, int size)
{
    int ret = 0;
    struct file *fp;
    mm_segment_t old_fs;
    loff_t pos = 0;

    /* change to KERNEL_DS address limit */
    old_fs = get_fs();
    set_fs(KERNEL_DS);

    /* open file to write */
    fp = filp_open("/tmp/mem_dump", O_WRONLY | O_CREAT, 0640);
    if (!fp) {
        brcmf_dbg(ERROR, "open file error\n");
        ret = -1;
        goto exit;
    }

    /* Write buf to file */
    fp->f_op->write(fp, (char __user *)buf, size, &pos);

exit:
    /* free buf before return */
    kfree(buf);
    /* close file before return */
    if (fp)
        filp_close(fp, NULL);
    /* restore previous address limit */
    set_fs(old_fs);

    return ret;
}
#endif              /* DEBUG */

static void brcmf_driver_init(struct work_struct *work)
{
    brcmf_debugfs_init();

#ifdef CONFIG_BRCMFMAC_SDIO
    brcmf_sdio_init();
#endif
#ifdef CONFIG_BRCMFMAC_USB
    brcmf_usb_init();
#endif
}
static DECLARE_WORK(brcmf_driver_work, brcmf_driver_init);

static int __init brcmfmac_module_init(void)
{
    if (!schedule_work(&brcmf_driver_work))
        return -EBUSY;

    return 0;
}

static void __exit brcmfmac_module_exit(void)
{
    cancel_work_sync(&brcmf_driver_work);

#ifdef CONFIG_BRCMFMAC_SDIO
    brcmf_sdio_exit();
#endif
#ifdef CONFIG_BRCMFMAC_USB
    brcmf_usb_exit();
#endif
    brcmf_debugfs_exit();
}

module_init(brcmfmac_module_init);
module_exit(brcmfmac_module_exit);