rtl871x_sta_mgt.c

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/******************************************************************************
 * rtl871x_sta_mgt.c
 *
 * Copyright(c) 2007 - 2010 Realtek Corporation. All rights reserved.
 * Linux device driver for RTL8192SU
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
 *
 * Modifications for inclusion into the Linux staging tree are
 * Copyright(c) 2010 Larry Finger. All rights reserved.
 *
 * Contact information:
 * WLAN FAE <[email protected]>
 * Larry Finger <[email protected]>
 *
 ******************************************************************************/

#define _RTL871X_STA_MGT_C_

#include "osdep_service.h"
#include "drv_types.h"
#include "recv_osdep.h"
#include "xmit_osdep.h"
#include "sta_info.h"

static void _init_stainfo(struct sta_info *psta)
{
    memset((u8 *)psta, 0, sizeof(struct sta_info));
     spin_lock_init(&psta->lock);
    _init_listhead(&psta->list);
    _init_listhead(&psta->hash_list);
    _r8712_init_sta_xmit_priv(&psta->sta_xmitpriv);
    _r8712_init_sta_recv_priv(&psta->sta_recvpriv);
    _init_listhead(&psta->asoc_list);
    _init_listhead(&psta->auth_list);
}

u32 _r8712_init_sta_priv(struct sta_priv *pstapriv)
{
    struct sta_info *psta;
    s32 i;

    pstapriv->pallocated_stainfo_buf = _malloc(sizeof(struct sta_info) *
                           NUM_STA + 4);
    if (pstapriv->pallocated_stainfo_buf == NULL)
        return _FAIL;
    pstapriv->pstainfo_buf = pstapriv->pallocated_stainfo_buf + 4 -
        ((addr_t)(pstapriv->pallocated_stainfo_buf) & 3);
    _init_queue(&pstapriv->free_sta_queue);
    spin_lock_init(&pstapriv->sta_hash_lock);
    pstapriv->asoc_sta_count = 0;
    _init_queue(&pstapriv->sleep_q);
    _init_queue(&pstapriv->wakeup_q);
    psta = (struct sta_info *)(pstapriv->pstainfo_buf);
    for (i = 0; i < NUM_STA; i++) {
        _init_stainfo(psta);
        _init_listhead(&(pstapriv->sta_hash[i]));
        list_insert_tail(&psta->list,
                 get_list_head(&pstapriv->free_sta_queue));
        psta++;
    }
    _init_listhead(&pstapriv->asoc_list);
    _init_listhead(&pstapriv->auth_list);
    return _SUCCESS;
}

/* this function is used to free the memory of lock || sema for all stainfos */
static void mfree_all_stainfo(struct sta_priv *pstapriv)
{
    unsigned long irqL;
    struct list_head *plist, *phead;
    struct sta_info *psta = NULL;

    spin_lock_irqsave(&pstapriv->sta_hash_lock, irqL);
    phead = get_list_head(&pstapriv->free_sta_queue);
    plist = get_next(phead);
    while ((end_of_queue_search(phead, plist)) == false) {
        psta = LIST_CONTAINOR(plist, struct sta_info, list);
        plist = get_next(plist);
    }

    spin_unlock_irqrestore(&pstapriv->sta_hash_lock, irqL);
}


static void mfree_sta_priv_lock(struct  sta_priv *pstapriv)
{
     mfree_all_stainfo(pstapriv); /* be done before free sta_hash_lock */
}

u32 _r8712_free_sta_priv(struct sta_priv *pstapriv)
{
    if (pstapriv) {
        mfree_sta_priv_lock(pstapriv);
        kfree(pstapriv->pallocated_stainfo_buf);
    }
    return _SUCCESS;
}

struct sta_info *r8712_alloc_stainfo(struct sta_priv *pstapriv, u8 *hwaddr)
{
    uint tmp_aid;
    s32 index;
    struct list_head *phash_list;
    struct sta_info *psta;
    struct  __queue *pfree_sta_queue;
    struct recv_reorder_ctrl *preorder_ctrl;
    int i = 0;
    u16  wRxSeqInitialValue = 0xffff;
    unsigned long flags;

    pfree_sta_queue = &pstapriv->free_sta_queue;
    spin_lock_irqsave(&(pfree_sta_queue->lock), flags);
    if (_queue_empty(pfree_sta_queue) == true)
        psta = NULL;
    else {
        psta = LIST_CONTAINOR(get_next(&pfree_sta_queue->queue),
                      struct sta_info, list);
        list_delete(&(psta->list));
        tmp_aid = psta->aid;
        _init_stainfo(psta);
        memcpy(psta->hwaddr, hwaddr, ETH_ALEN);
        index = wifi_mac_hash(hwaddr);
        if (index >= NUM_STA) {
            psta = NULL;
            goto exit;
        }
        phash_list = &(pstapriv->sta_hash[index]);
        list_insert_tail(&psta->hash_list, phash_list);
        pstapriv->asoc_sta_count++ ;

/* For the SMC router, the sequence number of first packet of WPS handshake
 * will be 0. In this case, this packet will be dropped by recv_decache function
 * if we use the 0x00 as the default value for tid_rxseq variable. So, we
 * initialize the tid_rxseq variable as the 0xffff.
 */
        for (i = 0; i < 16; i++)
            memcpy(&psta->sta_recvpriv.rxcache.tid_rxseq[i],
                &wRxSeqInitialValue, 2);
        /* for A-MPDU Rx reordering buffer control */
        for (i = 0; i < 16 ; i++) {
            preorder_ctrl = &psta->recvreorder_ctrl[i];
            preorder_ctrl->padapter = pstapriv->padapter;
            preorder_ctrl->indicate_seq = 0xffff;
            preorder_ctrl->wend_b = 0xffff;
            preorder_ctrl->wsize_b = 64;
            _init_queue(&preorder_ctrl->pending_recvframe_queue);
            r8712_init_recv_timer(preorder_ctrl);
        }
    }
exit:
    spin_unlock_irqrestore(&(pfree_sta_queue->lock), flags);
    return psta;
}

/* using pstapriv->sta_hash_lock to protect */
void r8712_free_stainfo(struct _adapter *padapter, struct sta_info *psta)
{
    int i;
    unsigned long irqL0;
    struct  __queue *pfree_sta_queue;
    struct recv_reorder_ctrl *preorder_ctrl;
    struct  sta_xmit_priv *pstaxmitpriv;
    struct  xmit_priv *pxmitpriv = &padapter->xmitpriv;
    struct  sta_priv *pstapriv = &padapter->stapriv;

    if (psta == NULL)
        return;
    pfree_sta_queue = &pstapriv->free_sta_queue;
    pstaxmitpriv = &psta->sta_xmitpriv;
    spin_lock_irqsave(&(pxmitpriv->vo_pending.lock), irqL0);
    r8712_free_xmitframe_queue(pxmitpriv, &pstaxmitpriv->vo_q.sta_pending);
    list_delete(&(pstaxmitpriv->vo_q.tx_pending));
    spin_unlock_irqrestore(&(pxmitpriv->vo_pending.lock), irqL0);
    spin_lock_irqsave(&(pxmitpriv->vi_pending.lock), irqL0);
    r8712_free_xmitframe_queue(pxmitpriv, &pstaxmitpriv->vi_q.sta_pending);
    list_delete(&(pstaxmitpriv->vi_q.tx_pending));
    spin_unlock_irqrestore(&(pxmitpriv->vi_pending.lock), irqL0);
    spin_lock_irqsave(&(pxmitpriv->bk_pending.lock), irqL0);
    r8712_free_xmitframe_queue(pxmitpriv, &pstaxmitpriv->bk_q.sta_pending);
    list_delete(&(pstaxmitpriv->bk_q.tx_pending));
    spin_unlock_irqrestore(&(pxmitpriv->bk_pending.lock), irqL0);
    spin_lock_irqsave(&(pxmitpriv->be_pending.lock), irqL0);
    r8712_free_xmitframe_queue(pxmitpriv, &pstaxmitpriv->be_q.sta_pending);
    list_delete(&(pstaxmitpriv->be_q.tx_pending));
    spin_unlock_irqrestore(&(pxmitpriv->be_pending.lock), irqL0);
    list_delete(&psta->hash_list);
    pstapriv->asoc_sta_count--;
    /* re-init sta_info; 20061114 */
    _r8712_init_sta_xmit_priv(&psta->sta_xmitpriv);
    _r8712_init_sta_recv_priv(&psta->sta_recvpriv);
    /* for A-MPDU Rx reordering buffer control,
     * cancel reordering_ctrl_timer */
    for (i = 0; i < 16; i++) {
        preorder_ctrl = &psta->recvreorder_ctrl[i];
        _cancel_timer_ex(&preorder_ctrl->reordering_ctrl_timer);
    }
    spin_lock(&(pfree_sta_queue->lock));
    /* insert into free_sta_queue; 20061114 */
    list_insert_tail(&psta->list, get_list_head(pfree_sta_queue));
    spin_unlock(&(pfree_sta_queue->lock));
}

/* free all stainfo which in sta_hash[all] */
void r8712_free_all_stainfo(struct _adapter *padapter)
{
    unsigned long irqL;
    struct list_head *plist, *phead;
    s32 index;
    struct sta_info *psta = NULL;
    struct  sta_priv *pstapriv = &padapter->stapriv;
    struct sta_info *pbcmc_stainfo = r8712_get_bcmc_stainfo(padapter);

    if (pstapriv->asoc_sta_count == 1)
        return;
    spin_lock_irqsave(&pstapriv->sta_hash_lock, irqL);
    for (index = 0; index < NUM_STA; index++) {
        phead = &(pstapriv->sta_hash[index]);
        plist = get_next(phead);
        while ((end_of_queue_search(phead, plist)) == false) {
            psta = LIST_CONTAINOR(plist,
                          struct sta_info, hash_list);
            plist = get_next(plist);
            if (pbcmc_stainfo != psta)
                r8712_free_stainfo(padapter , psta);
        }
    }
    spin_unlock_irqrestore(&pstapriv->sta_hash_lock, irqL);
}

/* any station allocated can be searched by hash list */
struct sta_info *r8712_get_stainfo(struct sta_priv *pstapriv, u8 *hwaddr)
{
    unsigned long    irqL;
    struct list_head *plist, *phead;
    struct sta_info *psta = NULL;
    u32 index;

    if (hwaddr == NULL)
        return NULL;
    index = wifi_mac_hash(hwaddr);
    spin_lock_irqsave(&pstapriv->sta_hash_lock, irqL);
    phead = &(pstapriv->sta_hash[index]);
    plist = get_next(phead);
    while ((end_of_queue_search(phead, plist)) == false) {
        psta = LIST_CONTAINOR(plist, struct sta_info, hash_list);
        if ((!memcmp(psta->hwaddr, hwaddr, ETH_ALEN))) {
            /* if found the matched address */
            break;
        }
        psta = NULL;
        plist = get_next(plist);
    }
    spin_unlock_irqrestore(&pstapriv->sta_hash_lock, irqL);
    return psta;
}

void r8712_init_bcmc_stainfo(struct _adapter *padapter)
{
    struct sta_info *psta;
    struct tx_servq *ptxservq;
    unsigned char bcast_addr[6] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
    struct  sta_priv *pstapriv = &padapter->stapriv;

    psta = r8712_alloc_stainfo(pstapriv, bcast_addr);
    if (psta == NULL)
        return;
    ptxservq = &(psta->sta_xmitpriv.be_q);
}

struct sta_info *r8712_get_bcmc_stainfo(struct _adapter *padapter)
{
    struct sta_info *psta;
    struct sta_priv *pstapriv = &padapter->stapriv;
    u8 bc_addr[ETH_ALEN] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};

    psta = r8712_get_stainfo(pstapriv, bc_addr);
    return psta;
}


u8 r8712_access_ctrl(struct wlan_acl_pool *pacl_list, u8 *mac_addr)
{
    return true;
}