- 根目录:
- drivers
- net
- wireless
- b43
- xmit.c
/*
Broadcom B43 wireless driver
Transmission (TX/RX) related functions.
Copyright (C) 2005 Martin Langer <martin-langer@gmx.de>
Copyright (C) 2005 Stefano Brivio <stefano.brivio@polimi.it>
Copyright (C) 2005, 2006 Michael Buesch <mb@bu3sch.de>
Copyright (C) 2005 Danny van Dyk <kugelfang@gentoo.org>
Copyright (C) 2005 Andreas Jaggi <andreas.jaggi@waterwave.ch>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
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; see the file COPYING. If not, write to
the Free Software Foundation, Inc., 51 Franklin Steet, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
#include "xmit.h"
#include "phy_common.h"
#include "dma.h"
#include "pio.h"
static const struct b43_tx_legacy_rate_phy_ctl_entry b43_tx_legacy_rate_phy_ctl[] = {
{ B43_CCK_RATE_1MB, 0x0, 0x0 },
{ B43_CCK_RATE_2MB, 0x0, 0x1 },
{ B43_CCK_RATE_5MB, 0x0, 0x2 },
{ B43_CCK_RATE_11MB, 0x0, 0x3 },
{ B43_OFDM_RATE_6MB, B43_TXH_PHY1_CRATE_1_2, B43_TXH_PHY1_MODUL_BPSK },
{ B43_OFDM_RATE_9MB, B43_TXH_PHY1_CRATE_3_4, B43_TXH_PHY1_MODUL_BPSK },
{ B43_OFDM_RATE_12MB, B43_TXH_PHY1_CRATE_1_2, B43_TXH_PHY1_MODUL_QPSK },
{ B43_OFDM_RATE_18MB, B43_TXH_PHY1_CRATE_3_4, B43_TXH_PHY1_MODUL_QPSK },
{ B43_OFDM_RATE_24MB, B43_TXH_PHY1_CRATE_1_2, B43_TXH_PHY1_MODUL_QAM16 },
{ B43_OFDM_RATE_36MB, B43_TXH_PHY1_CRATE_3_4, B43_TXH_PHY1_MODUL_QAM16 },
{ B43_OFDM_RATE_48MB, B43_TXH_PHY1_CRATE_2_3, B43_TXH_PHY1_MODUL_QAM64 },
{ B43_OFDM_RATE_54MB, B43_TXH_PHY1_CRATE_3_4, B43_TXH_PHY1_MODUL_QAM64 },
};
static const struct b43_tx_legacy_rate_phy_ctl_entry *
b43_tx_legacy_rate_phy_ctl_ent(u8 bitrate)
{
const struct b43_tx_legacy_rate_phy_ctl_entry *e;
unsigned int i;
for (i = 0; i < ARRAY_SIZE(b43_tx_legacy_rate_phy_ctl); i++) {
e = &(b43_tx_legacy_rate_phy_ctl[i]);
if (e->bitrate == bitrate)
return e;
}
B43_WARN_ON(1);
return NULL;
}
/* Extract the bitrate index out of a CCK PLCP header. */
static int b43_plcp_get_bitrate_idx_cck(struct b43_plcp_hdr6 *plcp)
{
switch (plcp->raw[0]) {
case 0x0A:
return 0;
case 0x14:
return 1;
case 0x37:
return 2;
case 0x6E:
return 3;
}
return -1;
}
/* Extract the bitrate index out of an OFDM PLCP header. */
static int b43_plcp_get_bitrate_idx_ofdm(struct b43_plcp_hdr6 *plcp, bool aphy)
{
int base = aphy ? 0 : 4;
switch (plcp->raw[0] & 0xF) {
case 0xB:
return base + 0;
case 0xF:
return base + 1;
case 0xA:
return base + 2;
case 0xE:
return base + 3;
case 0x9:
return base + 4;
case 0xD:
return base + 5;
case 0x8:
return base + 6;
case 0xC:
return base + 7;
}
return -1;
}
u8 b43_plcp_get_ratecode_cck(const u8 bitrate)
{
switch (bitrate) {
case B43_CCK_RATE_1MB:
return 0x0A;
case B43_CCK_RATE_2MB:
return 0x14;
case B43_CCK_RATE_5MB:
return 0x37;
case B43_CCK_RATE_11MB:
return 0x6E;
}
B43_WARN_ON(1);
return 0;
}
u8 b43_plcp_get_ratecode_ofdm(const u8 bitrate)
{
switch (bitrate) {
case B43_OFDM_RATE_6MB:
return 0xB;
case B43_OFDM_RATE_9MB:
return 0xF;
case B43_OFDM_RATE_12MB:
return 0xA;
case B43_OFDM_RATE_18MB:
return 0xE;
case B43_OFDM_RATE_24MB:
return 0x9;
case B43_OFDM_RATE_36MB:
return 0xD;
case B43_OFDM_RATE_48MB:
return 0x8;
case B43_OFDM_RATE_54MB:
return 0xC;
}
B43_WARN_ON(1);
return 0;
}
void b43_generate_plcp_hdr(struct b43_plcp_hdr4 *plcp,
const u16 octets, const u8 bitrate)
{
__u8 *raw = plcp->raw;
if (b43_is_ofdm_rate(bitrate)) {
u32 d;
d = b43_plcp_get_ratecode_ofdm(bitrate);
B43_WARN_ON(octets & 0xF000);
d |= (octets << 5);
plcp->data = cpu_to_le32(d);
} else {
u32 plen;
plen = octets * 16 / bitrate;
if ((octets * 16 % bitrate) > 0) {
plen++;
if ((bitrate == B43_CCK_RATE_11MB)
&& ((octets * 8 % 11) < 4)) {
raw[1] = 0x84;
} else
raw[1] = 0x04;
} else
raw[1] = 0x04;
plcp->data |= cpu_to_le32(plen << 16);
raw[0] = b43_plcp_get_ratecode_cck(bitrate);
}
}
static u16 b43_generate_tx_phy_ctl1(struct b43_wldev *dev, u8 bitrate)
{
const struct b43_phy *phy = &dev->phy;
const struct b43_tx_legacy_rate_phy_ctl_entry *e;
u16 control = 0;
u16 bw;
if (phy->type == B43_PHYTYPE_LP)
bw = B43_TXH_PHY1_BW_20;
else /* FIXME */
bw = B43_TXH_PHY1_BW_20;
if (0) { /* FIXME: MIMO */
} else if (b43_is_cck_rate(bitrate) && phy->type != B43_PHYTYPE_LP) {
control = bw;
} else {
control = bw;
e = b43_tx_legacy_rate_phy_ctl_ent(bitrate);
if (e) {
control |= e->coding_rate;
control |= e->modulation;
}
control |= B43_TXH_PHY1_MODE_SISO;
}
return control;
}
static u8 b43_calc_fallback_rate(u8 bitrate)
{
switch (bitrate) {
case B43_CCK_RATE_1MB:
return B43_CCK_RATE_1MB;
case B43_CCK_RATE_2MB:
return B43_CCK_RATE_1MB;
case B43_CCK_RATE_5MB:
return B43_CCK_RATE_2MB;
case B43_CCK_RATE_11MB:
return B43_CCK_RATE_5MB;
case B43_OFDM_RATE_6MB:
return B43_CCK_RATE_5MB;
case B43_OFDM_RATE_9MB:
return B43_OFDM_RATE_6MB;
case B43_OFDM_RATE_12MB:
return B43_OFDM_RATE_9MB;
case B43_OFDM_RATE_18MB:
return B43_OFDM_RATE_12MB;
case B43_OFDM_RATE_24MB:
return B43_OFDM_RATE_18MB;
case B43_OFDM_RATE_36MB:
return B43_OFDM_RATE_24MB;
case B43_OFDM_RATE_48MB:
return B43_OFDM_RATE_36MB;
case B43_OFDM_RATE_54MB:
return B43_OFDM_RATE_48MB;
}
B43_WARN_ON(1);
return 0;
}
/* Generate a TX data header. */
int b43_generate_txhdr(struct b43_wldev *dev,
u8 *_txhdr,
struct sk_buff *skb_frag,
struct ieee80211_tx_info *info,
u16 cookie)
{
const unsigned char *fragment_data = skb_frag->data;
unsigned int fragment_len = skb_frag->len;
struct b43_txhdr *txhdr = (struct b43_txhdr *)_txhdr;
const struct b43_phy *phy = &dev->phy;
const struct ieee80211_hdr *wlhdr =
(const struct ieee80211_hdr *)fragment_data;
int use_encryption = !!info->control.hw_key;
__le16 fctl = wlhdr->frame_control;
struct ieee80211_rate *fbrate;
u8 rate, rate_fb;
int rate_ofdm, rate_fb_ofdm;
unsigned int plcp_fragment_len;
u32 mac_ctl = 0;
u16 phy_ctl = 0;
u8 extra_ft = 0;
struct ieee80211_rate *txrate;
struct ieee80211_tx_rate *rates;
memset(txhdr, 0, sizeof(*txhdr));
txrate = ieee80211_get_tx_rate(dev->wl->hw, info);
rate = txrate ? txrate->hw_value : B43_CCK_RATE_1MB;
rate_ofdm = b43_is_ofdm_rate(rate);
fbrate = ieee80211_get_alt_retry_rate(dev->wl->hw, info, 0) ? : txrate;
rate_fb = fbrate->hw_value;
rate_fb_ofdm = b43_is_ofdm_rate(rate_fb);
if (rate_ofdm)
txhdr->phy_rate = b43_plcp_get_ratecode_ofdm(rate);
else
txhdr->phy_rate = b43_plcp_get_ratecode_cck(rate);
txhdr->mac_frame_ctl = wlhdr->frame_control;
memcpy(txhdr->tx_receiver, wlhdr->addr1, 6);
/* Calculate duration for fallback rate */
if ((rate_fb == rate) ||
(wlhdr->duration_id & cpu_to_le16(0x8000)) ||
(wlhdr->duration_id == cpu_to_le16(0))) {
/* If the fallback rate equals the normal rate or the
* dur_id field contains an AID, CFP magic or 0,
* use the original dur_id field. */
txhdr->dur_fb = wlhdr->duration_id;
} else {
txhdr->dur_fb = ieee80211_generic_frame_duration(
dev->wl->hw, info->control.vif, fragment_len, fbrate);
}
plcp_fragment_len = fragment_len + FCS_LEN;
if (use_encryption) {
u8 key_idx = info->control.hw_key->hw_key_idx;
struct b43_key *key;
int wlhdr_len;
size_t iv_len;
B43_WARN_ON(key_idx >= ARRAY_SIZE(dev->key));
key = &(dev->key[key_idx]);
if (unlikely(!key->keyconf)) {
/* This key is invalid. This might only happen
* in a short timeframe after machine resume before
* we were able to reconfigure keys.
* Drop this packet completely. Do not transmit it
* unencrypted to avoid leaking information. */
return -ENOKEY;
}
/* Hardware appends ICV. */
plcp_fragment_len += info->control.hw_key->icv_len;
key_idx = b43_kidx_to_fw(dev, key_idx);
mac_ctl |= (key_idx << B43_TXH_MAC_KEYIDX_SHIFT) &
B43_TXH_MAC_KEYIDX;
mac_ctl |= (key->algorithm << B43_TXH_MAC_KEYALG_SHIFT) &
B43_TXH_MAC_KEYALG;
wlhdr_len = ieee80211_hdrlen(fctl);
if (key->algorithm == B43_SEC_ALGO_TKIP) {
u16 phase1key[5];
int i;
/* we give the phase1key and iv16 here, the key is stored in
* shm. With that the hardware can do phase 2 and encryption.
*/
ieee80211_get_tkip_key(info->control.hw_key, skb_frag,
IEEE80211_TKIP_P1_KEY, (u8*)phase1key);
/* phase1key is in host endian. Copy to little-endian txhdr->iv. */
for (i = 0; i < 5; i++) {
txhdr->iv[i * 2 + 0] = phase1key[i];
txhdr->iv[i * 2 + 1] = phase1key[i] >> 8;
}
/* iv16 */
memcpy(txhdr->iv + 10, ((u8 *) wlhdr) + wlhdr_len, 3);
} else {
iv_len = min((size_t) info->control.hw_key->iv_len,
ARRAY_SIZE(txhdr->iv));
memcpy(txhdr->iv, ((u8 *) wlhdr) + wlhdr_len, iv_len);
}
}
if (b43_is_old_txhdr_format(dev)) {
b43_generate_plcp_hdr((struct b43_plcp_hdr4 *)(&txhdr->old_format.plcp),
plcp_fragment_len, rate);
} else {
b43_generate_plcp_hdr((struct b43_plcp_hdr4 *)(&txhdr->new_format.plcp),
plcp_fragment_len, rate);
}
b43_generate_plcp_hdr((struct b43_plcp_hdr4 *)(&txhdr->plcp_fb),
plcp_fragment_len, rate_fb);
/* Extra Frame Types */
if (rate_fb_ofdm)
extra_ft |= B43_TXH_EFT_FB_OFDM;
else
extra_ft |= B43_TXH_EFT_FB_CCK;
/* Set channel radio code. Note that the micrcode ORs 0x100 to
* this value before comparing it to the value in SHM, if this
* is a 5Ghz packet.
*/
txhdr->chan_radio_code = phy->channel;
/* PHY TX Control word */
if (rate_ofdm)
phy_ctl |= B43_TXH_PHY_ENC_OFDM;
else
phy_ctl |= B43_TXH_PHY_ENC_CCK;
if (info->control.rates[0].flags & IEEE80211_TX_RC_USE_SHORT_PREAMBLE)
phy_ctl |= B43_TXH_PHY_SHORTPRMBL;
switch (b43_ieee80211_antenna_sanitize(dev, info->antenna_sel_tx)) {
case 0: /* Default */
phy_ctl |= B43_TXH_PHY_ANT01AUTO;
break;
case 1: /* Antenna 0 */
phy_ctl |= B43_TXH_PHY_ANT0;
break;
case 2: /* Antenna 1 */
phy_ctl |= B43_TXH_PHY_ANT1;
break;
case 3: /* Antenna 2 */
phy_ctl |= B43_TXH_PHY_ANT2;
break;
case 4: /* Antenna 3 */
phy_ctl |= B43_TXH_PHY_ANT3;
break;
default:
B43_WARN_ON(1);
}
rates = info->control.rates;
/* MAC control */
if (!(info->flags & IEEE80211_TX_CTL_NO_ACK))
mac_ctl |= B43_TXH_MAC_ACK;
/* use hardware sequence counter as the non-TID counter */
if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ)
mac_ctl |= B43_TXH_MAC_HWSEQ;
if (info->flags & IEEE80211_TX_CTL_FIRST_FRAGMENT)
mac_ctl |= B43_TXH_MAC_STMSDU;
if (phy->type == B43_PHYTYPE_A)
mac_ctl |= B43_TXH_MAC_5GHZ;
/* Overwrite rates[0].count to make the retry calculation
* in the tx status easier. need the actual retry limit to
* detect whether the fallback rate was used.
*/
if ((rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) ||
(rates[0].count <= dev->wl->hw->conf.long_frame_max_tx_count)) {
rates[0].count = dev->wl->hw->conf.long_frame_max_tx_count;
mac_ctl |= B43_TXH_MAC_LONGFRAME;
} else {
rates[0].count = dev->wl->hw->conf.short_frame_max_tx_count;
}
/* Generate the RTS or CTS-to-self frame */
if ((rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) ||
(rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT)) {
unsigned int len;
struct ieee80211_hdr *hdr;
int rts_rate, rts_rate_fb;
int rts_rate_ofdm, rts_rate_fb_ofdm;
struct b43_plcp_hdr6 *plcp;
struct ieee80211_rate *rts_cts_rate;
rts_cts_rate = ieee80211_get_rts_cts_rate(dev->wl->hw, info);
rts_rate = rts_cts_rate ? rts_cts_rate->hw_value : B43_CCK_RATE_1MB;
rts_rate_ofdm = b43_is_ofdm_rate(rts_rate);
rts_rate_fb = b43_calc_fallback_rate(rts_rate);
rts_rate_fb_ofdm = b43_is_ofdm_rate(rts_rate_fb);
if (rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT) {
struct ieee80211_cts *cts;
if (b43_is_old_txhdr_format(dev)) {
cts = (struct ieee80211_cts *)
(txhdr->old_format.rts_frame);
} else {
cts = (struct ieee80211_cts *)
(txhdr->new_format.rts_frame);
}
ieee80211_ctstoself_get(dev->wl->hw, info->control.vif,
fragment_data, fragment_len,
info, cts);
mac_ctl |= B43_TXH_MAC_SENDCTS;
len = sizeof(struct ieee80211_cts);
} else {
struct ieee80211_rts *rts;
if (b43_is_old_txhdr_format(dev)) {
rts = (struct ieee80211_rts *)
(txhdr->old_format.rts_frame);
} else {
rts = (struct ieee80211_rts *)
(txhdr->new_format.rts_frame);
}
ieee80211_rts_get(dev->wl->hw, info->control.vif,
fragment_data, fragment_len,
info, rts);
mac_ctl |= B43_TXH_MAC_SENDRTS;
len = sizeof(struct ieee80211_rts);
}
len += FCS_LEN;
/* Generate the PLCP headers for the RTS/CTS frame */
if (b43_is_old_txhdr_format(dev))
plcp = &txhdr->old_format.rts_plcp;
else
plcp = &txhdr->new_format.rts_plcp;
b43_generate_plcp_hdr((struct b43_plcp_hdr4 *)plcp,
len, rts_rate);
plcp = &txhdr->rts_plcp_fb;
b43_generate_plcp_hdr((struct b43_plcp_hdr4 *)plcp,
len, rts_rate_fb);
if (b43_is_old_txhdr_format(dev)) {
hdr = (struct ieee80211_hdr *)
(&txhdr->old_format.rts_frame);
} else {
hdr = (struct ieee80211_hdr *)
(&txhdr->new_format.rts_frame);
}
txhdr->rts_dur_fb = hdr->duration_id;
if (rts_rate_ofdm) {
extra_ft |= B43_TXH_EFT_RTS_OFDM;
txhdr->phy_rate_rts =
b43_plcp_get_ratecode_ofdm(rts_rate);
} else {
extra_ft |= B43_TXH_EFT_RTS_CCK;
txhdr->phy_rate_rts =
b43_plcp_get_ratecode_cck(rts_rate);
}
if (rts_rate_fb_ofdm)
extra_ft |= B43_TXH_EFT_RTSFB_OFDM;
else
extra_ft |= B43_TXH_EFT_RTSFB_CCK;
if (rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS &&
phy->type == B43_PHYTYPE_N) {
txhdr->phy_ctl1_rts = cpu_to_le16(
b43_generate_tx_phy_ctl1(dev, rts_rate));
txhdr->phy_ctl1_rts_fb = cpu_to_le16(
b43_generate_tx_phy_ctl1(dev, rts_rate_fb));
}
}
/* Magic cookie */
if (b43_is_old_txhdr_format(dev))
txhdr->old_format.cookie = cpu_to_le16(cookie);
else
txhdr->new_format.cookie = cpu_to_le16(cookie);
if (phy->type == B43_PHYTYPE_N) {
txhdr->phy_ctl1 =
cpu_to_le16(b43_generate_tx_phy_ctl1(dev, rate));
txhdr->phy_ctl1_fb =
cpu_to_le16(b43_generate_tx_phy_ctl1(dev, rate_fb));
}
/* Apply the bitfields */
txhdr->mac_ctl = cpu_to_le32(mac_ctl);
txhdr->phy_ctl = cpu_to_le16(phy_ctl);
txhdr->extra_ft = extra_ft;
return 0;
}
static s8 b43_rssi_postprocess(struct b43_wldev *dev,
u8 in_rssi, int ofdm,
int adjust_2053, int adjust_2050)
{
struct b43_phy *phy = &dev->phy;
struct b43_phy_g *gphy = phy->g;
s32 tmp;
switch (phy->radio_ver) {
case 0x2050:
if (ofdm) {
tmp = in_rssi;
if (tmp > 127)
tmp -= 256;
tmp *= 73;
tmp /= 64;
if (adjust_2050)
tmp += 25;
else
tmp -= 3;
} else {
if (dev->dev->bus->sprom.
boardflags_lo & B43_BFL_RSSI) {
if (in_rssi > 63)
in_rssi = 63;
B43_WARN_ON(phy->type != B43_PHYTYPE_G);
tmp = gphy->nrssi_lt[in_rssi];
tmp = 31 - tmp;
tmp *= -131;
tmp /= 128;
tmp -= 57;
} else {
tmp = in_rssi;
tmp = 31 - tmp;
tmp *= -149;
tmp /= 128;
tmp -= 68;
}
if (phy->type == B43_PHYTYPE_G && adjust_2050)
tmp += 25;
}
break;
case 0x2060:
if (in_rssi > 127)
tmp = in_rssi - 256;
else
tmp = in_rssi;
break;
default:
tmp = in_rssi;
tmp -= 11;
tmp *= 103;
tmp /= 64;
if (adjust_2053)
tmp -= 109;
else
tmp -= 83;
}
return (s8) tmp;
}
//TODO
#if 0
static s8 b43_rssinoise_postprocess(struct b43_wldev *dev, u8 in_rssi)
{
struct b43_phy *phy = &dev->phy;
s8 ret;
if (phy->type == B43_PHYTYPE_A) {
//TODO: Incomplete specs.
ret = 0;
} else
ret = b43_rssi_postprocess(dev, in_rssi, 0, 1, 1);
return ret;
}
#endif
void b43_rx(struct b43_wldev *dev, struct sk_buff *skb, const void *_rxhdr)
{
struct ieee80211_rx_status status;
struct b43_plcp_hdr6 *plcp;
struct ieee80211_hdr *wlhdr;
const struct b43_rxhdr_fw4 *rxhdr = _rxhdr;
__le16 fctl;
u16 phystat0, phystat3, chanstat, mactime;
u32 macstat;
u16 chanid;
u16 phytype;
int padding;
memset(&status, 0, sizeof(status));
/* Get metadata about the frame from the header. */
phystat0 = le16_to_cpu(rxhdr->phy_status0);
phystat3 = le16_to_cpu(rxhdr->phy_status3);
macstat = le32_to_cpu(rxhdr->mac_status);
mactime = le16_to_cpu(rxhdr->mac_time);
chanstat = le16_to_cpu(rxhdr->channel);
phytype = chanstat & B43_RX_CHAN_PHYTYPE;
if (unlikely(macstat & B43_RX_MAC_FCSERR)) {
dev->wl->ieee_stats.dot11FCSErrorCount++;
status.flag |= RX_FLAG_FAILED_FCS_CRC;
}
if (unlikely(phystat0 & (B43_RX_PHYST0_PLCPHCF | B43_RX_PHYST0_PLCPFV)))
status.flag |= RX_FLAG_FAILED_PLCP_CRC;
if (phystat0 & B43_RX_PHYST0_SHORTPRMBL)
status.flag |= RX_FLAG_SHORTPRE;
if (macstat & B43_RX_MAC_DECERR) {
/* Decryption with the given key failed.
* Drop the packet. We also won't be able to decrypt it with
* the key in software. */
goto drop;
}
/* Skip PLCP and padding */
padding = (macstat & B43_RX_MAC_PADDING) ? 2 : 0;
if (unlikely(skb->len < (sizeof(struct b43_plcp_hdr6) + padding))) {
b43dbg(dev->wl, "RX: Packet size underrun (1)\n");
goto drop;
}
plcp = (struct b43_plcp_hdr6 *)(skb->data + padding);
skb_pull(skb, sizeof(struct b43_plcp_hdr6) + padding);
/* The skb contains the Wireless Header + payload data now */
if (unlikely(skb->len < (2 + 2 + 6 /*minimum hdr */ + FCS_LEN))) {
b43dbg(dev->wl, "RX: Packet size underrun (2)\n");
goto drop;
}
wlhdr = (struct ieee80211_hdr *)(skb->data);
fctl = wlhdr->frame_control;
if (macstat & B43_RX_MAC_DEC) {
unsigned int keyidx;
int wlhdr_len;
keyidx = ((macstat & B43_RX_MAC_KEYIDX)
>> B43_RX_MAC_KEYIDX_SHIFT);
/* We must adjust the key index here. We want the "physical"
* key index, but the ucode passed it slightly different.
*/
keyidx = b43_kidx_to_raw(dev, keyidx);
B43_WARN_ON(keyidx >= ARRAY_SIZE(dev->key));
if (dev->key[keyidx].algorithm != B43_SEC_ALGO_NONE) {
wlhdr_len = ieee80211_hdrlen(fctl);
if (unlikely(skb->len < (wlhdr_len + 3))) {
b43dbg(dev->wl,
"RX: Packet size underrun (3)\n");
goto drop;
}
status.flag |= RX_FLAG_DECRYPTED;
}
}
/* Link quality statistics */
if ((chanstat & B43_RX_CHAN_PHYTYPE) == B43_PHYTYPE_N) {
// s8 rssi = max(rxhdr->power0, rxhdr->power1);
//TODO: Find out what the rssi value is (dBm or percentage?)
// and also find out what the maximum possible value is.
// Fill status.ssi and status.signal fields.
} else {
status.signal = b43_rssi_postprocess(dev, rxhdr->jssi,
(phystat0 & B43_RX_PHYST0_OFDM),
(phystat0 & B43_RX_PHYST0_GAINCTL),
(phystat3 & B43_RX_PHYST3_TRSTATE));
}
if (phystat0 & B43_RX_PHYST0_OFDM)
status.rate_idx = b43_plcp_get_bitrate_idx_ofdm(plcp,
phytype == B43_PHYTYPE_A);
else
status.rate_idx = b43_plcp_get_bitrate_idx_cck(plcp);
if (unlikely(status.rate_idx == -1)) {
/* PLCP seems to be corrupted.
* Drop the frame, if we are not interested in corrupted frames. */
if (!(dev->wl->filter_flags & FIF_PLCPFAIL))
goto drop;
}
status.antenna = !!(phystat0 & B43_RX_PHYST0_ANT);
/*
* All frames on monitor interfaces and beacons always need a full
* 64-bit timestamp. Monitor interfaces need it for diagnostic
* purposes and beacons for IBSS merging.
* This code assumes we get to process the packet within 16 bits
* of timestamp, i.e. about 65 milliseconds after the PHY received
* the first symbol.
*/
if (ieee80211_is_beacon(fctl) || dev->wl->radiotap_enabled) {
u16 low_mactime_now;
b43_tsf_read(dev, &status.mactime);
low_mactime_now = status.mactime;
status.mactime = status.mactime & ~0xFFFFULL;
status.mactime += mactime;
if (low_mactime_now <= mactime)
status.mactime -= 0x10000;
status.flag |= RX_FLAG_MACTIME_MPDU;
}
chanid = (chanstat & B43_RX_CHAN_ID) >> B43_RX_CHAN_ID_SHIFT;
switch (chanstat & B43_RX_CHAN_PHYTYPE) {
case B43_PHYTYPE_A:
status.band = IEEE80211_BAND_5GHZ;
B43_WARN_ON(1);
/* FIXME: We don't really know which value the "chanid" contains.
* So the following assignment might be wrong. */
status.freq = b43_channel_to_freq_5ghz(chanid);
break;
case B43_PHYTYPE_G:
status.band = IEEE80211_BAND_2GHZ;
/* chanid is the radio channel cookie value as used
* to tune the radio. */
status.freq = chanid + 2400;
break;
case B43_PHYTYPE_N:
case B43_PHYTYPE_LP:
/* chanid is the SHM channel cookie. Which is the plain
* channel number in b43. */
if (chanstat & B43_RX_CHAN_5GHZ) {
status.band = IEEE80211_BAND_5GHZ;
status.freq = b43_freq_to_channel_5ghz(chanid);
} else {
status.band = IEEE80211_BAND_2GHZ;
status.freq = b43_freq_to_channel_2ghz(chanid);
}
break;
default:
B43_WARN_ON(1);
goto drop;
}
memcpy(IEEE80211_SKB_RXCB(skb), &status, sizeof(status));
ieee80211_rx_ni(dev->wl->hw, skb);
#if B43_DEBUG
dev->rx_count++;
#endif
return;
drop:
b43dbg(dev->wl, "RX: Packet dropped\n");
dev_kfree_skb_any(skb);
}
void b43_handle_txstatus(struct b43_wldev *dev,
const struct b43_txstatus *status)
{
b43_debugfs_log_txstat(dev, status);
if (status->intermediate)
return;
if (status->for_ampdu)
return;
if (!status->acked)
dev->wl->ieee_stats.dot11ACKFailureCount++;
if (status->rts_count) {
if (status->rts_count == 0xF) //FIXME
dev->wl->ieee_stats.dot11RTSFailureCount++;
else
dev->wl->ieee_stats.dot11RTSSuccessCount++;
}
if (b43_using_pio_transfers(dev))
b43_pio_handle_txstatus(dev, status);
else
b43_dma_handle_txstatus(dev, status);
b43_phy_txpower_check(dev, 0);
}
/* Fill out the mac80211 TXstatus report based on the b43-specific
* txstatus report data. This returns a boolean whether the frame was
* successfully transmitted. */
bool b43_fill_txstatus_report(struct b43_wldev *dev,
struct ieee80211_tx_info *report,
const struct b43_txstatus *status)
{
bool frame_success = 1;
int retry_limit;
/* preserve the confiured retry limit before clearing the status
* The xmit function has overwritten the rc's value with the actual
* retry limit done by the hardware */
retry_limit = report->status.rates[0].count;
ieee80211_tx_info_clear_status(report);
if (status->acked) {
/* The frame was ACKed. */
report->flags |= IEEE80211_TX_STAT_ACK;
} else {
/* The frame was not ACKed... */
if (!(report->flags & IEEE80211_TX_CTL_NO_ACK)) {
/* ...but we expected an ACK. */
frame_success = 0;
}
}
if (status->frame_count == 0) {
/* The frame was not transmitted at all. */
report->status.rates[0].count = 0;
} else if (status->rts_count > dev->wl->hw->conf.short_frame_max_tx_count) {
/*
* If the short retries (RTS, not data frame) have exceeded
* the limit, the hw will not have tried the selected rate,
* but will have used the fallback rate instead.
* Don't let the rate control count attempts for the selected
* rate in this case, otherwise the statistics will be off.
*/
report->status.rates[0].count = 0;
report->status.rates[1].count = status->frame_count;
} else {
if (status->frame_count > retry_limit) {
report->status.rates[0].count = retry_limit;
report->status.rates[1].count = status->frame_count -
retry_limit;
} else {
report->status.rates[0].count = status->frame_count;
report->status.rates[1].idx = -1;
}
}
return frame_success;
}
/* Stop any TX operation on the device (suspend the hardware queues) */
void b43_tx_suspend(struct b43_wldev *dev)
{
if (b43_using_pio_transfers(dev))
b43_pio_tx_suspend(dev);
else
b43_dma_tx_suspend(dev);
}
/* Resume any TX operation on the device (resume the hardware queues) */
void b43_tx_resume(struct b43_wldev *dev)
{
if (b43_using_pio_transfers(dev))
b43_pio_tx_resume(dev);
else
b43_dma_tx_resume(dev);
}