/******************************************************************************
* rtl8712_recv.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 <wlanfae@realtek.com>
* Larry Finger <Larry.Finger@lwfinger.net>
*
******************************************************************************/
#define _RTL8712_RECV_C_
#include <linux/if_ether.h>
#include <linux/ip.h>
#include "osdep_service.h"
#include "drv_types.h"
#include "recv_osdep.h"
#include "mlme_osdep.h"
#include "ethernet.h"
#include "usb_ops.h"
#include "wifi.h"
/* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
static u8 bridge_tunnel_header[] = {0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8};
/* Ethernet-II snap header (RFC1042 for most EtherTypes) */
static u8 rfc1042_header[] = {0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00};
static void recv_tasklet(void *priv);
int r8712_init_recv_priv(struct recv_priv *precvpriv, struct _adapter *padapter)
{
int i;
struct recv_buf *precvbuf;
int res = _SUCCESS;
addr_t tmpaddr = 0;
int alignment = 0;
struct sk_buff *pskb = NULL;
/*init recv_buf*/
_init_queue(&precvpriv->free_recv_buf_queue);
precvpriv->pallocated_recv_buf = _malloc(NR_RECVBUFF *
sizeof(struct recv_buf) + 4);
if (precvpriv->pallocated_recv_buf == NULL)
return _FAIL;
memset(precvpriv->pallocated_recv_buf, 0, NR_RECVBUFF *
sizeof(struct recv_buf) + 4);
precvpriv->precv_buf = precvpriv->pallocated_recv_buf + 4 -
((addr_t) (precvpriv->pallocated_recv_buf) & 3);
precvbuf = (struct recv_buf *)precvpriv->precv_buf;
for (i = 0; i < NR_RECVBUFF; i++) {
_init_listhead(&precvbuf->list);
spin_lock_init(&precvbuf->recvbuf_lock);
res = r8712_os_recvbuf_resource_alloc(padapter, precvbuf);
if (res == _FAIL)
break;
precvbuf->ref_cnt = 0;
precvbuf->adapter = padapter;
list_insert_tail(&precvbuf->list,
&(precvpriv->free_recv_buf_queue.queue));
precvbuf++;
}
precvpriv->free_recv_buf_queue_cnt = NR_RECVBUFF;
tasklet_init(&precvpriv->recv_tasklet,
(void(*)(unsigned long))recv_tasklet,
(unsigned long)padapter);
skb_queue_head_init(&precvpriv->rx_skb_queue);
skb_queue_head_init(&precvpriv->free_recv_skb_queue);
for (i = 0; i < NR_PREALLOC_RECV_SKB; i++) {
pskb = netdev_alloc_skb(padapter->pnetdev, MAX_RECVBUF_SZ +
RECVBUFF_ALIGN_SZ);
if (pskb) {
pskb->dev = padapter->pnetdev;
tmpaddr = (addr_t)pskb->data;
alignment = tmpaddr & (RECVBUFF_ALIGN_SZ-1);
skb_reserve(pskb, (RECVBUFF_ALIGN_SZ - alignment));
skb_queue_tail(&precvpriv->free_recv_skb_queue, pskb);
}
pskb = NULL;
}
return res;
}
void r8712_free_recv_priv(struct recv_priv *precvpriv)
{
int i;
struct recv_buf *precvbuf;
struct _adapter *padapter = precvpriv->adapter;
precvbuf = (struct recv_buf *)precvpriv->precv_buf;
for (i = 0; i < NR_RECVBUFF ; i++) {
r8712_os_recvbuf_resource_free(padapter, precvbuf);
precvbuf++;
}
kfree(precvpriv->pallocated_recv_buf);
skb_queue_purge(&precvpriv->rx_skb_queue);
if (skb_queue_len(&precvpriv->rx_skb_queue))
netdev_warn(padapter->pnetdev, "r8712u: rx_skb_queue not empty\n");
skb_queue_purge(&precvpriv->free_recv_skb_queue);
if (skb_queue_len(&precvpriv->free_recv_skb_queue))
netdev_warn(padapter->pnetdev, "r8712u: free_recv_skb_queue not empty %d\n",
skb_queue_len(&precvpriv->free_recv_skb_queue));
}
int r8712_init_recvbuf(struct _adapter *padapter, struct recv_buf *precvbuf)
{
int res = _SUCCESS;
precvbuf->transfer_len = 0;
precvbuf->len = 0;
precvbuf->ref_cnt = 0;
if (precvbuf->pbuf) {
precvbuf->pdata = precvbuf->pbuf;
precvbuf->phead = precvbuf->pbuf;
precvbuf->ptail = precvbuf->pbuf;
precvbuf->pend = precvbuf->pdata + MAX_RECVBUF_SZ;
}
return res;
}
int r8712_free_recvframe(union recv_frame *precvframe,
struct __queue *pfree_recv_queue)
{
unsigned long irqL;
struct _adapter *padapter = precvframe->u.hdr.adapter;
struct recv_priv *precvpriv = &padapter->recvpriv;
if (precvframe->u.hdr.pkt) {
dev_kfree_skb_any(precvframe->u.hdr.pkt);/*free skb by driver*/
precvframe->u.hdr.pkt = NULL;
}
spin_lock_irqsave(&pfree_recv_queue->lock, irqL);
list_delete(&(precvframe->u.hdr.list));
list_insert_tail(&(precvframe->u.hdr.list),
get_list_head(pfree_recv_queue));
if (padapter != NULL) {
if (pfree_recv_queue == &precvpriv->free_recv_queue)
precvpriv->free_recvframe_cnt++;
}
spin_unlock_irqrestore(&pfree_recv_queue->lock, irqL);
return _SUCCESS;
}
static void update_recvframe_attrib_from_recvstat(struct rx_pkt_attrib *pattrib,
struct recv_stat *prxstat)
{
u32 *pphy_info;
struct phy_stat *pphy_stat;
u16 drvinfo_sz = 0;
drvinfo_sz = (le32_to_cpu(prxstat->rxdw0)&0x000f0000)>>16;
drvinfo_sz = drvinfo_sz<<3;
/*TODO:
* Offset 0 */
pattrib->bdecrypted = ((le32_to_cpu(prxstat->rxdw0) & BIT(27)) >> 27)
? 0 : 1;
pattrib->crc_err = ((le32_to_cpu(prxstat->rxdw0) & BIT(14)) >> 14);
/*Offset 4*/
/*Offset 8*/
/*Offset 12*/
if (le32_to_cpu(prxstat->rxdw3) & BIT(13)) {
pattrib->tcpchk_valid = 1; /* valid */
if (le32_to_cpu(prxstat->rxdw3) & BIT(11))
pattrib->tcp_chkrpt = 1; /* correct */
else
pattrib->tcp_chkrpt = 0; /* incorrect */
if (le32_to_cpu(prxstat->rxdw3) & BIT(12))
pattrib->ip_chkrpt = 1; /* correct */
else
pattrib->ip_chkrpt = 0; /* incorrect */
} else
pattrib->tcpchk_valid = 0; /* invalid */
pattrib->mcs_rate = (u8)((le32_to_cpu(prxstat->rxdw3)) & 0x3f);
pattrib->htc = (u8)((le32_to_cpu(prxstat->rxdw3) >> 14) & 0x1);
/*Offset 16*/
/*Offset 20*/
/*phy_info*/
if (drvinfo_sz) {
pphy_stat = (struct phy_stat *)(prxstat+1);
pphy_info = (u32 *)prxstat+1;
}
}
/*perform defrag*/
static union recv_frame *recvframe_defrag(struct _adapter *adapter,
struct __queue *defrag_q)
{
struct list_head *plist, *phead;
u8 *data, wlanhdr_offset;
u8 curfragnum;
struct recv_frame_hdr *pfhdr, *pnfhdr;
union recv_frame *prframe, *pnextrframe;
struct __queue *pfree_recv_queue;
pfree_recv_queue = &adapter->recvpriv.free_recv_queue;
phead = get_list_head(defrag_q);
plist = get_next(phead);
prframe = LIST_CONTAINOR(plist, union recv_frame, u);
list_delete(&prframe->u.list);
pfhdr = &prframe->u.hdr;
curfragnum = 0;
if (curfragnum != pfhdr->attrib.frag_num) {
/*the first fragment number must be 0
*free the whole queue*/
r8712_free_recvframe(prframe, pfree_recv_queue);
r8712_free_recvframe_queue(defrag_q, pfree_recv_queue);
return NULL;
}
curfragnum++;
plist = get_list_head(defrag_q);
plist = get_next(plist);
data = get_recvframe_data(prframe);
while (end_of_queue_search(phead, plist) == false) {
pnextrframe = LIST_CONTAINOR(plist, union recv_frame, u);
pnfhdr = &pnextrframe->u.hdr;
/*check the fragment sequence (2nd ~n fragment frame) */
if (curfragnum != pnfhdr->attrib.frag_num) {
/* the fragment number must increase (after decache)
* release the defrag_q & prframe */
r8712_free_recvframe(prframe, pfree_recv_queue);
r8712_free_recvframe_queue(defrag_q, pfree_recv_queue);
return NULL;
}
curfragnum++;
/* copy the 2nd~n fragment frame's payload to the first fragment
* get the 2nd~last fragment frame's payload */
wlanhdr_offset = pnfhdr->attrib.hdrlen + pnfhdr->attrib.iv_len;
recvframe_pull(pnextrframe, wlanhdr_offset);
/* append to first fragment frame's tail (if privacy frame,
* pull the ICV) */
recvframe_pull_tail(prframe, pfhdr->attrib.icv_len);
memcpy(pfhdr->rx_tail, pnfhdr->rx_data, pnfhdr->len);
recvframe_put(prframe, pnfhdr->len);
pfhdr->attrib.icv_len = pnfhdr->attrib.icv_len;
plist = get_next(plist);
}
/* free the defrag_q queue and return the prframe */
r8712_free_recvframe_queue(defrag_q, pfree_recv_queue);
return prframe;
}
/* check if need to defrag, if needed queue the frame to defrag_q */
union recv_frame *r8712_recvframe_chk_defrag(struct _adapter *padapter,
union recv_frame *precv_frame)
{
u8 ismfrag;
u8 fragnum;
u8 *psta_addr;
struct recv_frame_hdr *pfhdr;
struct sta_info *psta;
struct sta_priv *pstapriv ;
struct list_head *phead;
union recv_frame *prtnframe = NULL;
struct __queue *pfree_recv_queue, *pdefrag_q;
pstapriv = &padapter->stapriv;
pfhdr = &precv_frame->u.hdr;
pfree_recv_queue = &padapter->recvpriv.free_recv_queue;
/* need to define struct of wlan header frame ctrl */
ismfrag = pfhdr->attrib.mfrag;
fragnum = pfhdr->attrib.frag_num;
psta_addr = pfhdr->attrib.ta;
psta = r8712_get_stainfo(pstapriv, psta_addr);
if (psta == NULL)
pdefrag_q = NULL;
else
pdefrag_q = &psta->sta_recvpriv.defrag_q;
if ((ismfrag == 0) && (fragnum == 0))
prtnframe = precv_frame;/*isn't a fragment frame*/
if (ismfrag == 1) {
/* 0~(n-1) fragment frame
* enqueue to defraf_g */
if (pdefrag_q != NULL) {
if (fragnum == 0) {
/*the first fragment*/
if (_queue_empty(pdefrag_q) == false) {
/*free current defrag_q */
r8712_free_recvframe_queue(pdefrag_q,
pfree_recv_queue);
}
}
/* Then enqueue the 0~(n-1) fragment to the defrag_q */
phead = get_list_head(pdefrag_q);
list_insert_tail(&pfhdr->list, phead);
prtnframe = NULL;
} else {
/* can't find this ta's defrag_queue, so free this
* recv_frame */
r8712_free_recvframe(precv_frame, pfree_recv_queue);
prtnframe = NULL;
}
}
if ((ismfrag == 0) && (fragnum != 0)) {
/* the last fragment frame
* enqueue the last fragment */
if (pdefrag_q != NULL) {
phead = get_list_head(pdefrag_q);
list_insert_tail(&pfhdr->list, phead);
/*call recvframe_defrag to defrag*/
precv_frame = recvframe_defrag(padapter, pdefrag_q);
prtnframe = precv_frame;
} else {
/* can't find this ta's defrag_queue, so free this
* recv_frame */
r8712_free_recvframe(precv_frame, pfree_recv_queue);
prtnframe = NULL;
}
}
if ((prtnframe != NULL) && (prtnframe->u.hdr.attrib.privacy)) {
/* after defrag we must check tkip mic code */
if (r8712_recvframe_chkmic(padapter, prtnframe) == _FAIL) {
r8712_free_recvframe(prtnframe, pfree_recv_queue);
prtnframe = NULL;
}
}
return prtnframe;
}
static int amsdu_to_msdu(struct _adapter *padapter, union recv_frame *prframe)
{
int a_len, padding_len;
u16 eth_type, nSubframe_Length;
u8 nr_subframes, i;
unsigned char *data_ptr, *pdata;
struct rx_pkt_attrib *pattrib;
_pkt *sub_skb, *subframes[MAX_SUBFRAME_COUNT];
struct recv_priv *precvpriv = &padapter->recvpriv;
struct __queue *pfree_recv_queue = &(precvpriv->free_recv_queue);
int ret = _SUCCESS;
nr_subframes = 0;
pattrib = &prframe->u.hdr.attrib;
recvframe_pull(prframe, prframe->u.hdr.attrib.hdrlen);
if (prframe->u.hdr.attrib.iv_len > 0)
recvframe_pull(prframe, prframe->u.hdr.attrib.iv_len);
a_len = prframe->u.hdr.len;
pdata = prframe->u.hdr.rx_data;
while (a_len > ETH_HLEN) {
/* Offset 12 denote 2 mac address */
nSubframe_Length = *((u16 *)(pdata + 12));
/*==m==>change the length order*/
nSubframe_Length = (nSubframe_Length >> 8) +
(nSubframe_Length << 8);
if (a_len < (ETHERNET_HEADER_SIZE + nSubframe_Length)) {
netdev_warn(padapter->pnetdev, "r8712u: nRemain_Length is %d and nSubframe_Length is: %d\n",
a_len, nSubframe_Length);
goto exit;
}
/* move the data point to data content */
pdata += ETH_HLEN;
a_len -= ETH_HLEN;
/* Allocate new skb for releasing to upper layer */
sub_skb = dev_alloc_skb(nSubframe_Length + 12);
if (!sub_skb)
break;
skb_reserve(sub_skb, 12);
data_ptr = (u8 *)skb_put(sub_skb, nSubframe_Length);
memcpy(data_ptr, pdata, nSubframe_Length);
subframes[nr_subframes++] = sub_skb;
if (nr_subframes >= MAX_SUBFRAME_COUNT) {
netdev_warn(padapter->pnetdev, "r8712u: ParseSubframe(): Too many Subframes! Packets dropped!\n");
break;
}
pdata += nSubframe_Length;
a_len -= nSubframe_Length;
if (a_len != 0) {
padding_len = 4 - ((nSubframe_Length + ETH_HLEN) & 3);
if (padding_len == 4)
padding_len = 0;
if (a_len < padding_len)
goto exit;
pdata += padding_len;
a_len -= padding_len;
}
}
for (i = 0; i < nr_subframes; i++) {
sub_skb = subframes[i];
/* convert hdr + possible LLC headers into Ethernet header */
eth_type = (sub_skb->data[6] << 8) | sub_skb->data[7];
if (sub_skb->len >= 8 &&
((!memcmp(sub_skb->data, rfc1042_header, SNAP_SIZE) &&
eth_type != ETH_P_AARP && eth_type != ETH_P_IPX) ||
!memcmp(sub_skb->data, bridge_tunnel_header, SNAP_SIZE))) {
/* remove RFC1042 or Bridge-Tunnel encapsulation and
* replace EtherType */
skb_pull(sub_skb, SNAP_SIZE);
memcpy(skb_push(sub_skb, ETH_ALEN), pattrib->src,
ETH_ALEN);
memcpy(skb_push(sub_skb, ETH_ALEN), pattrib->dst,
ETH_ALEN);
} else {
u16 len;
/* Leave Ethernet header part of hdr and full payload */
len = htons(sub_skb->len);
memcpy(skb_push(sub_skb, 2), &len, 2);
memcpy(skb_push(sub_skb, ETH_ALEN), pattrib->src,
ETH_ALEN);
memcpy(skb_push(sub_skb, ETH_ALEN), pattrib->dst,
ETH_ALEN);
}
/* Indicate the packets to upper layer */
if (sub_skb) {
sub_skb->protocol =
eth_type_trans(sub_skb, padapter->pnetdev);
sub_skb->dev = padapter->pnetdev;
if ((pattrib->tcpchk_valid == 1) &&
(pattrib->tcp_chkrpt == 1)) {
sub_skb->ip_summed = CHECKSUM_UNNECESSARY;
} else
sub_skb->ip_summed = CHECKSUM_NONE;
netif_rx(sub_skb);
}
}
exit:
prframe->u.hdr.len = 0;
r8712_free_recvframe(prframe, pfree_recv_queue);
return ret;
}
void r8712_rxcmd_event_hdl(struct _adapter *padapter, void *prxcmdbuf)
{
uint voffset;
u8 *poffset;
u16 pkt_len, cmd_len, drvinfo_sz;
u8 eid, cmd_seq;
struct recv_stat *prxstat;
poffset = (u8 *)prxcmdbuf;
voffset = *(uint *)poffset;
pkt_len = le32_to_cpu(voffset) & 0x00003fff;
prxstat = (struct recv_stat *)prxcmdbuf;
drvinfo_sz = ((le32_to_cpu(prxstat->rxdw0) & 0x000f0000) >> 16);
drvinfo_sz = drvinfo_sz << 3;
poffset += RXDESC_SIZE + drvinfo_sz;
do {
voffset = *(uint *)poffset;
cmd_len = (u16)(le32_to_cpu(voffset) & 0xffff);
cmd_seq = (u8)((le32_to_cpu(voffset) >> 24) & 0x7f);
eid = (u8)((le32_to_cpu(voffset) >> 16) & 0xff);
r8712_event_handle(padapter, (uint *)poffset);
poffset += (cmd_len + 8);/*8 bytes alignment*/
} while (le32_to_cpu(voffset) & BIT(31));
}
static int check_indicate_seq(struct recv_reorder_ctrl *preorder_ctrl,
u16 seq_num)
{
u8 wsize = preorder_ctrl->wsize_b;
u16 wend = (preorder_ctrl->indicate_seq + wsize - 1) % 4096;
/* Rx Reorder initialize condition.*/
if (preorder_ctrl->indicate_seq == 0xffff)
preorder_ctrl->indicate_seq = seq_num;
/* Drop out the packet which SeqNum is smaller than WinStart */
if (SN_LESS(seq_num, preorder_ctrl->indicate_seq))
return false;
/*
* Sliding window manipulation. Conditions includes:
* 1. Incoming SeqNum is equal to WinStart =>Window shift 1
* 2. Incoming SeqNum is larger than the WinEnd => Window shift N
*/
if (SN_EQUAL(seq_num, preorder_ctrl->indicate_seq))
preorder_ctrl->indicate_seq = (preorder_ctrl->indicate_seq +
1) % 4096;
else if (SN_LESS(wend, seq_num)) {
if (seq_num >= (wsize - 1))
preorder_ctrl->indicate_seq = seq_num + 1 - wsize;
else
preorder_ctrl->indicate_seq = 4095 - (wsize -
(seq_num + 1)) + 1;
}
return true;
}
static int enqueue_reorder_recvframe(struct recv_reorder_ctrl *preorder_ctrl,
union recv_frame *prframe)
{
struct list_head *phead, *plist;
union recv_frame *pnextrframe;
struct rx_pkt_attrib *pnextattrib;
struct __queue *ppending_recvframe_queue =
&preorder_ctrl->pending_recvframe_queue;
struct rx_pkt_attrib *pattrib = &prframe->u.hdr.attrib;
phead = get_list_head(ppending_recvframe_queue);
plist = get_next(phead);
while (end_of_queue_search(phead, plist) == false) {
pnextrframe = LIST_CONTAINOR(plist, union recv_frame, u);
pnextattrib = &pnextrframe->u.hdr.attrib;
if (SN_LESS(pnextattrib->seq_num, pattrib->seq_num))
plist = get_next(plist);
else if (SN_EQUAL(pnextattrib->seq_num, pattrib->seq_num))
return false;
else
break;
}
list_delete(&(prframe->u.hdr.list));
list_insert_tail(&(prframe->u.hdr.list), plist);
return true;
}
int r8712_recv_indicatepkts_in_order(struct _adapter *padapter,
struct recv_reorder_ctrl *preorder_ctrl,
int bforced)
{
struct list_head *phead, *plist;
union recv_frame *prframe;
struct rx_pkt_attrib *pattrib;
int bPktInBuf = false;
struct recv_priv *precvpriv = &padapter->recvpriv;
struct __queue *ppending_recvframe_queue =
&preorder_ctrl->pending_recvframe_queue;
phead = get_list_head(ppending_recvframe_queue);
plist = get_next(phead);
/* Handling some condition for forced indicate case.*/
if (bforced == true) {
if (is_list_empty(phead))
return true;
else {
prframe = LIST_CONTAINOR(plist, union recv_frame, u);
pattrib = &prframe->u.hdr.attrib;
preorder_ctrl->indicate_seq = pattrib->seq_num;
}
}
/* Prepare indication list and indication.
* Check if there is any packet need indicate. */
while (!is_list_empty(phead)) {
prframe = LIST_CONTAINOR(plist, union recv_frame, u);
pattrib = &prframe->u.hdr.attrib;
if (!SN_LESS(preorder_ctrl->indicate_seq, pattrib->seq_num)) {
plist = get_next(plist);
list_delete(&(prframe->u.hdr.list));
if (SN_EQUAL(preorder_ctrl->indicate_seq,
pattrib->seq_num))
preorder_ctrl->indicate_seq =
(preorder_ctrl->indicate_seq + 1) % 4096;
/*indicate this recv_frame*/
if (!pattrib->amsdu) {
if ((padapter->bDriverStopped == false) &&
(padapter->bSurpriseRemoved == false)) {
/* indicate this recv_frame */
r8712_recv_indicatepkt(padapter,
prframe);
}
} else if (pattrib->amsdu == 1) {
if (amsdu_to_msdu(padapter, prframe) !=
_SUCCESS)
r8712_free_recvframe(prframe,
&precvpriv->free_recv_queue);
}
/* Update local variables. */
bPktInBuf = false;
} else {
bPktInBuf = true;
break;
}
}
return bPktInBuf;
}
static int recv_indicatepkt_reorder(struct _adapter *padapter,
union recv_frame *prframe)
{
unsigned long irql;
struct rx_pkt_attrib *pattrib = &prframe->u.hdr.attrib;
struct recv_reorder_ctrl *preorder_ctrl = prframe->u.hdr.preorder_ctrl;
struct __queue *ppending_recvframe_queue =
&preorder_ctrl->pending_recvframe_queue;
if (!pattrib->amsdu) {
/* s1. */
r8712_wlanhdr_to_ethhdr(prframe);
if (pattrib->qos != 1) {
if ((padapter->bDriverStopped == false) &&
(padapter->bSurpriseRemoved == false)) {
r8712_recv_indicatepkt(padapter, prframe);
return _SUCCESS;
} else
return _FAIL;
}
}
spin_lock_irqsave(&ppending_recvframe_queue->lock, irql);
/*s2. check if winstart_b(indicate_seq) needs to be updated*/
if (!check_indicate_seq(preorder_ctrl, pattrib->seq_num))
goto _err_exit;
/*s3. Insert all packet into Reorder Queue to maintain its ordering.*/
if (!enqueue_reorder_recvframe(preorder_ctrl, prframe))
goto _err_exit;
/*s4.
* Indication process.
* After Packet dropping and Sliding Window shifting as above, we can
* now just indicate the packets with the SeqNum smaller than latest
* WinStart and buffer other packets.
*
* For Rx Reorder condition:
* 1. All packets with SeqNum smaller than WinStart => Indicate
* 2. All packets with SeqNum larger than or equal to
* WinStart => Buffer it.
*/
if (r8712_recv_indicatepkts_in_order(padapter, preorder_ctrl, false) ==
true) {
_set_timer(&preorder_ctrl->reordering_ctrl_timer,
REORDER_WAIT_TIME);
spin_unlock_irqrestore(&ppending_recvframe_queue->lock, irql);
} else {
spin_unlock_irqrestore(&ppending_recvframe_queue->lock, irql);
_cancel_timer_ex(&preorder_ctrl->reordering_ctrl_timer);
}
return _SUCCESS;
_err_exit:
spin_unlock_irqrestore(&ppending_recvframe_queue->lock, irql);
return _FAIL;
}
void r8712_reordering_ctrl_timeout_handler(void *pcontext)
{
unsigned long irql;
struct recv_reorder_ctrl *preorder_ctrl =
(struct recv_reorder_ctrl *)pcontext;
struct _adapter *padapter = preorder_ctrl->padapter;
struct __queue *ppending_recvframe_queue =
&preorder_ctrl->pending_recvframe_queue;
if (padapter->bDriverStopped || padapter->bSurpriseRemoved)
return;
spin_lock_irqsave(&ppending_recvframe_queue->lock, irql);
r8712_recv_indicatepkts_in_order(padapter, preorder_ctrl, true);
spin_unlock_irqrestore(&ppending_recvframe_queue->lock, irql);
}
static int r8712_process_recv_indicatepkts(struct _adapter *padapter,
union recv_frame *prframe)
{
int retval = _SUCCESS;
struct mlme_priv *pmlmepriv = &padapter->mlmepriv;
struct ht_priv *phtpriv = &pmlmepriv->htpriv;
if (phtpriv->ht_option == 1) { /*B/G/N Mode*/
if (recv_indicatepkt_reorder(padapter, prframe) != _SUCCESS) {
/* including perform A-MPDU Rx Ordering Buffer Control*/
if ((padapter->bDriverStopped == false) &&
(padapter->bSurpriseRemoved == false))
return _FAIL;
}
} else { /*B/G mode*/
retval = r8712_wlanhdr_to_ethhdr(prframe);
if (retval != _SUCCESS)
return retval;
if ((padapter->bDriverStopped == false) &&
(padapter->bSurpriseRemoved == false)) {
/* indicate this recv_frame */
r8712_recv_indicatepkt(padapter, prframe);
} else
return _FAIL;
}
return retval;
}
static u8 query_rx_pwr_percentage(s8 antpower)
{
if ((antpower <= -100) || (antpower >= 20))
return 0;
else if (antpower >= 0)
return 100;
else
return 100 + antpower;
}
static u8 evm_db2percentage(s8 value)
{
/*
* -33dB~0dB to 0%~99%
*/
s8 ret_val;
ret_val = value;
if (ret_val >= 0)
ret_val = 0;
if (ret_val <= -33)
ret_val = -33;
ret_val = -ret_val;
ret_val *= 3;
if (ret_val == 99)
ret_val = 100;
return ret_val;
}
s32 r8712_signal_scale_mapping(s32 cur_sig)
{
s32 ret_sig;
if (cur_sig >= 51 && cur_sig <= 100)
ret_sig = 100;
else if (cur_sig >= 41 && cur_sig <= 50)
ret_sig = 80 + ((cur_sig - 40) * 2);
else if (cur_sig >= 31 && cur_sig <= 40)
ret_sig = 66 + (cur_sig - 30);
else if (cur_sig >= 21 && cur_sig <= 30)
ret_sig = 54 + (cur_sig - 20);
else if (cur_sig >= 10 && cur_sig <= 20)
ret_sig = 42 + (((cur_sig - 10) * 2) / 3);
else if (cur_sig >= 5 && cur_sig <= 9)
ret_sig = 22 + (((cur_sig - 5) * 3) / 2);
else if (cur_sig >= 1 && cur_sig <= 4)
ret_sig = 6 + (((cur_sig - 1) * 3) / 2);
else
ret_sig = cur_sig;
return ret_sig;
}
static s32 translate2dbm(struct _adapter *padapter, u8 signal_strength_idx)
{
s32 signal_power; /* in dBm.*/
/* Translate to dBm (x=0.5y-95).*/
signal_power = (s32)((signal_strength_idx + 1) >> 1);
signal_power -= 95;
return signal_power;
}
static void query_rx_phy_status(struct _adapter *padapter,
union recv_frame *prframe)
{
u8 i, max_spatial_stream, evm;
struct recv_stat *prxstat = (struct recv_stat *)prframe->u.hdr.rx_head;
struct phy_stat *pphy_stat = (struct phy_stat *)(prxstat + 1);
u8 *pphy_head = (u8 *)(prxstat + 1);
s8 rx_pwr[4], rx_pwr_all;
u8 pwdb_all;
u32 rssi, total_rssi = 0;
u8 bcck_rate = 0, rf_rx_num = 0, cck_highpwr = 0;
struct phy_cck_rx_status *pcck_buf;
u8 sq;
/* Record it for next packet processing*/
bcck_rate = (prframe->u.hdr.attrib.mcs_rate <= 3 ? 1 : 0);
if (bcck_rate) {
u8 report;
/* CCK Driver info Structure is not the same as OFDM packet.*/
pcck_buf = (struct phy_cck_rx_status *)pphy_stat;
/* (1)Hardware does not provide RSSI for CCK
* (2)PWDB, Average PWDB cacluated by hardware
* (for rate adaptive)
*/
if (!cck_highpwr) {
report = pcck_buf->cck_agc_rpt & 0xc0;
report = report >> 6;
switch (report) {
/* Modify the RF RNA gain value to -40, -20,
* -2, 14 by Jenyu's suggestion
* Note: different RF with the different
* RNA gain. */
case 0x3:
rx_pwr_all = -40 - (pcck_buf->cck_agc_rpt &
0x3e);
break;
case 0x2:
rx_pwr_all = -20 - (pcck_buf->cck_agc_rpt &
0x3e);
break;
case 0x1:
rx_pwr_all = -2 - (pcck_buf->cck_agc_rpt &
0x3e);
break;
case 0x0:
rx_pwr_all = 14 - (pcck_buf->cck_agc_rpt &
0x3e);
break;
}
} else {
report = ((u8)(le32_to_cpu(pphy_stat->phydw1) >> 8)) &
0x60;
report = report >> 5;
switch (report) {
case 0x3:
rx_pwr_all = -40 - ((pcck_buf->cck_agc_rpt &
0x1f) << 1);
break;
case 0x2:
rx_pwr_all = -20 - ((pcck_buf->cck_agc_rpt &
0x1f) << 1);
break;
case 0x1:
rx_pwr_all = -2 - ((pcck_buf->cck_agc_rpt &
0x1f) << 1);
break;
case 0x0:
rx_pwr_all = 14 - ((pcck_buf->cck_agc_rpt &
0x1f) << 1);
break;
}
}
pwdb_all = query_rx_pwr_percentage(rx_pwr_all);
/* CCK gain is smaller than OFDM/MCS gain,*/
/* so we add gain diff by experiences, the val is 6 */
pwdb_all += 6;
if (pwdb_all > 100)
pwdb_all = 100;
/* modify the offset to make the same gain index with OFDM.*/
if (pwdb_all > 34 && pwdb_all <= 42)
pwdb_all -= 2;
else if (pwdb_all > 26 && pwdb_all <= 34)
pwdb_all -= 6;
else if (pwdb_all > 14 && pwdb_all <= 26)
pwdb_all -= 8;
else if (pwdb_all > 4 && pwdb_all <= 14)
pwdb_all -= 4;
/*
* (3) Get Signal Quality (EVM)
*/
if (pwdb_all > 40)
sq = 100;
else {
sq = pcck_buf->sq_rpt;
if (pcck_buf->sq_rpt > 64)
sq = 0;
else if (pcck_buf->sq_rpt < 20)
sq = 100;
else
sq = ((64-sq) * 100) / 44;
}
prframe->u.hdr.attrib.signal_qual = sq;
prframe->u.hdr.attrib.rx_mimo_signal_qual[0] = sq;
prframe->u.hdr.attrib.rx_mimo_signal_qual[1] = -1;
} else {
/* (1)Get RSSI for HT rate */
for (i = 0; i < ((padapter->registrypriv.rf_config) &
0x0f) ; i++) {
rf_rx_num++;
rx_pwr[i] = ((pphy_head[PHY_STAT_GAIN_TRSW_SHT + i]
& 0x3F) * 2) - 110;
/* Translate DBM to percentage. */
rssi = query_rx_pwr_percentage(rx_pwr[i]);
total_rssi += rssi;
}
/* (2)PWDB, Average PWDB cacluated by hardware (for
* rate adaptive) */
rx_pwr_all = (((pphy_head[PHY_STAT_PWDB_ALL_SHT]) >> 1) & 0x7f)
- 106;
pwdb_all = query_rx_pwr_percentage(rx_pwr_all);
{
/* (3)EVM of HT rate */
if (prframe->u.hdr.attrib.htc &&
prframe->u.hdr.attrib.mcs_rate >= 20 &&
prframe->u.hdr.attrib.mcs_rate <= 27) {
/* both spatial stream make sense */
max_spatial_stream = 2;
} else {
/* only spatial stream 1 makes sense */
max_spatial_stream = 1;
}
for (i = 0; i < max_spatial_stream; i++) {
evm = evm_db2percentage((pphy_head
[PHY_STAT_RXEVM_SHT + i]));/*dbm*/
prframe->u.hdr.attrib.signal_qual =
(u8)(evm & 0xff);
prframe->u.hdr.attrib.rx_mimo_signal_qual[i] =
(u8)(evm & 0xff);
}
}
}
/* UI BSS List signal strength(in percentage), make it good looking,
* from 0~100. It is assigned to the BSS List in
* GetValueFromBeaconOrProbeRsp(). */
if (bcck_rate)
prframe->u.hdr.attrib.signal_strength =
(u8)r8712_signal_scale_mapping(pwdb_all);
else {
if (rf_rx_num != 0)
prframe->u.hdr.attrib.signal_strength =
(u8)(r8712_signal_scale_mapping(total_rssi /=
rf_rx_num));
}
}
static void process_link_qual(struct _adapter *padapter,
union recv_frame *prframe)
{
u32 last_evm = 0, tmpVal;
struct rx_pkt_attrib *pattrib;
if (prframe == NULL || padapter == NULL)
return;
pattrib = &prframe->u.hdr.attrib;
if (pattrib->signal_qual != 0) {
/*
* 1. Record the general EVM to the sliding window.
*/
if (padapter->recvpriv.signal_qual_data.total_num++ >=
PHY_LINKQUALITY_SLID_WIN_MAX) {
padapter->recvpriv.signal_qual_data.total_num =
PHY_LINKQUALITY_SLID_WIN_MAX;
last_evm = padapter->recvpriv.signal_qual_data.elements
[padapter->recvpriv.signal_qual_data.index];
padapter->recvpriv.signal_qual_data.total_val -=
last_evm;
}
padapter->recvpriv.signal_qual_data.total_val +=
pattrib->signal_qual;
padapter->recvpriv.signal_qual_data.elements[padapter->
recvpriv.signal_qual_data.index++] =
pattrib->signal_qual;
if (padapter->recvpriv.signal_qual_data.index >=
PHY_LINKQUALITY_SLID_WIN_MAX)
padapter->recvpriv.signal_qual_data.index = 0;
/* <1> Showed on UI for user, in percentage. */
tmpVal = padapter->recvpriv.signal_qual_data.total_val /
padapter->recvpriv.signal_qual_data.total_num;
padapter->recvpriv.signal = (u8)tmpVal;
}
}
static void process_rssi(struct _adapter *padapter, union recv_frame *prframe)
{
u32 last_rssi, tmp_val;
struct rx_pkt_attrib *pattrib = &prframe->u.hdr.attrib;
if (padapter->recvpriv.signal_strength_data.total_num++ >=
PHY_RSSI_SLID_WIN_MAX) {
padapter->recvpriv.signal_strength_data.total_num =
PHY_RSSI_SLID_WIN_MAX;
last_rssi = padapter->recvpriv.signal_strength_data.elements
[padapter->recvpriv.signal_strength_data.index];
padapter->recvpriv.signal_strength_data.total_val -= last_rssi;
}
padapter->recvpriv.signal_strength_data.total_val +=
pattrib->signal_strength;
padapter->recvpriv.signal_strength_data.elements[padapter->recvpriv.
signal_strength_data.index++] =
pattrib->signal_strength;
if (padapter->recvpriv.signal_strength_data.index >=
PHY_RSSI_SLID_WIN_MAX)
padapter->recvpriv.signal_strength_data.index = 0;
tmp_val = padapter->recvpriv.signal_strength_data.total_val /
padapter->recvpriv.signal_strength_data.total_num;
padapter->recvpriv.rssi = (s8)translate2dbm(padapter, (u8)tmp_val);
}
static void process_phy_info(struct _adapter *padapter,
union recv_frame *prframe)
{
query_rx_phy_status(padapter, prframe);
process_rssi(padapter, prframe);
process_link_qual(padapter, prframe);
}
int recv_func(struct _adapter *padapter, void *pcontext)
{
struct rx_pkt_attrib *pattrib;
union recv_frame *prframe, *orig_prframe;
int retval = _SUCCESS;
struct __queue *pfree_recv_queue = &padapter->recvpriv.free_recv_queue;
struct mlme_priv *pmlmepriv = &padapter->mlmepriv;
prframe = (union recv_frame *)pcontext;
orig_prframe = prframe;
pattrib = &prframe->u.hdr.attrib;
if ((check_fwstate(pmlmepriv, WIFI_MP_STATE) == true)) {
if (pattrib->crc_err == 1)
padapter->mppriv.rx_crcerrpktcount++;
else
padapter->mppriv.rx_pktcount++;
if (check_fwstate(pmlmepriv, WIFI_MP_LPBK_STATE) == false) {
/* free this recv_frame */
r8712_free_recvframe(orig_prframe, pfree_recv_queue);
goto _exit_recv_func;
}
}
/* check the frame crtl field and decache */
retval = r8712_validate_recv_frame(padapter, prframe);
if (retval != _SUCCESS) {
/* free this recv_frame */
r8712_free_recvframe(orig_prframe, pfree_recv_queue);
goto _exit_recv_func;
}
process_phy_info(padapter, prframe);
prframe = r8712_decryptor(padapter, prframe);
if (prframe == NULL) {
retval = _FAIL;
goto _exit_recv_func;
}
prframe = r8712_recvframe_chk_defrag(padapter, prframe);
if (prframe == NULL)
goto _exit_recv_func;
prframe = r8712_portctrl(padapter, prframe);
if (prframe == NULL) {
retval = _FAIL;
goto _exit_recv_func;
}
retval = r8712_process_recv_indicatepkts(padapter, prframe);
if (retval != _SUCCESS) {
r8712_free_recvframe(orig_prframe, pfree_recv_queue);
goto _exit_recv_func;
}
_exit_recv_func:
return retval;
}
static int recvbuf2recvframe(struct _adapter *padapter, struct sk_buff *pskb)
{
u8 *pbuf, shift_sz = 0;
u8 frag, mf;
uint pkt_len;
u32 transfer_len;
struct recv_stat *prxstat;
u16 pkt_cnt, drvinfo_sz, pkt_offset, tmp_len, alloc_sz;
struct __queue *pfree_recv_queue;
_pkt *pkt_copy = NULL;
union recv_frame *precvframe = NULL;
struct recv_priv *precvpriv = &padapter->recvpriv;
pfree_recv_queue = &(precvpriv->free_recv_queue);
pbuf = pskb->data;
prxstat = (struct recv_stat *)pbuf;
pkt_cnt = (le32_to_cpu(prxstat->rxdw2)>>16)&0xff;
pkt_len = le32_to_cpu(prxstat->rxdw0)&0x00003fff;
transfer_len = pskb->len;
/* Test throughput with Netgear 3700 (No security) with Chariot 3T3R
* pairs. The packet count will be a big number so that the containing
* packet will effect the Rx reordering. */
if (transfer_len < pkt_len) {
/* In this case, it means the MAX_RECVBUF_SZ is too small to
* get the data from 8712u. */
return _FAIL;
}
do {
prxstat = (struct recv_stat *)pbuf;
pkt_len = le32_to_cpu(prxstat->rxdw0)&0x00003fff;
/* more fragment bit */
mf = (le32_to_cpu(prxstat->rxdw1) >> 27) & 0x1;
/* ragmentation number */
frag = (le32_to_cpu(prxstat->rxdw2) >> 12) & 0xf;
/* uint 2^3 = 8 bytes */
drvinfo_sz = (le32_to_cpu(prxstat->rxdw0) & 0x000f0000) >> 16;
drvinfo_sz = drvinfo_sz<<3;
if (pkt_len <= 0)
goto _exit_recvbuf2recvframe;
/* Qos data, wireless lan header length is 26 */
if ((le32_to_cpu(prxstat->rxdw0) >> 23) & 0x01)
shift_sz = 2;
precvframe = r8712_alloc_recvframe(pfree_recv_queue);
if (precvframe == NULL)
goto _exit_recvbuf2recvframe;
_init_listhead(&precvframe->u.hdr.list);
precvframe->u.hdr.precvbuf = NULL; /*can't access the precvbuf*/
precvframe->u.hdr.len = 0;
tmp_len = pkt_len + drvinfo_sz + RXDESC_SIZE;
pkt_offset = (u16)_RND128(tmp_len);
/* for first fragment packet, driver need allocate 1536 +
* drvinfo_sz + RXDESC_SIZE to defrag packet. */
if ((mf == 1) && (frag == 0))
alloc_sz = 1658;/*1658+6=1664, 1664 is 128 alignment.*/
else
alloc_sz = tmp_len;
/* 2 is for IP header 4 bytes alignment in QoS packet case.
* 4 is for skb->data 4 bytes alignment. */
alloc_sz += 6;
pkt_copy = netdev_alloc_skb(padapter->pnetdev, alloc_sz);
if (pkt_copy) {
pkt_copy->dev = padapter->pnetdev;
precvframe->u.hdr.pkt = pkt_copy;
skb_reserve(pkt_copy, 4 - ((addr_t)(pkt_copy->data)
% 4));
skb_reserve(pkt_copy, shift_sz);
memcpy(pkt_copy->data, pbuf, tmp_len);
precvframe->u.hdr.rx_head = precvframe->u.hdr.rx_data =
precvframe->u.hdr.rx_tail = pkt_copy->data;
precvframe->u.hdr.rx_end = pkt_copy->data + alloc_sz;
} else {
precvframe->u.hdr.pkt = skb_clone(pskb, GFP_ATOMIC);
if (!precvframe->u.hdr.pkt)
return _FAIL;
precvframe->u.hdr.rx_head = pbuf;
precvframe->u.hdr.rx_data = pbuf;
precvframe->u.hdr.rx_tail = pbuf;
precvframe->u.hdr.rx_end = pbuf + alloc_sz;
}
recvframe_put(precvframe, tmp_len);
recvframe_pull(precvframe, drvinfo_sz + RXDESC_SIZE);
/* because the endian issue, driver avoid reference to the
* rxstat after calling update_recvframe_attrib_from_recvstat();
*/
update_recvframe_attrib_from_recvstat(&precvframe->u.hdr.attrib,
prxstat);
r8712_recv_entry(precvframe);
transfer_len -= pkt_offset;
pbuf += pkt_offset;
pkt_cnt--;
precvframe = NULL;
pkt_copy = NULL;
} while ((transfer_len > 0) && pkt_cnt > 0);
_exit_recvbuf2recvframe:
return _SUCCESS;
}
static void recv_tasklet(void *priv)
{
struct sk_buff *pskb;
struct _adapter *padapter = (struct _adapter *)priv;
struct recv_priv *precvpriv = &padapter->recvpriv;
while (NULL != (pskb = skb_dequeue(&precvpriv->rx_skb_queue))) {
recvbuf2recvframe(padapter, pskb);
skb_reset_tail_pointer(pskb);
pskb->len = 0;
if (!skb_cloned(pskb))
skb_queue_tail(&precvpriv->free_recv_skb_queue, pskb);
else
consume_skb(pskb);
}
}