583 lines
16 KiB
C
583 lines
16 KiB
C
/*
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Broadcom BCM43xx wireless driver
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Transmission (TX/RX) related functions.
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Copyright (c) 2005 Martin Langer <martin-langer@gmx.de>,
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Stefano Brivio <st3@riseup.net>
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Michael Buesch <mbuesch@freenet.de>
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Danny van Dyk <kugelfang@gentoo.org>
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Andreas Jaggi <andreas.jaggi@waterwave.ch>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; see the file COPYING. If not, write to
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the Free Software Foundation, Inc., 51 Franklin Steet, Fifth Floor,
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Boston, MA 02110-1301, USA.
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*/
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#include "bcm43xx_xmit.h"
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#include <linux/etherdevice.h>
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/* Extract the bitrate out of a CCK PLCP header. */
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static u8 bcm43xx_plcp_get_bitrate_cck(struct bcm43xx_plcp_hdr4 *plcp)
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{
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switch (plcp->raw[0]) {
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case 0x0A:
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return IEEE80211_CCK_RATE_1MB;
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case 0x14:
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return IEEE80211_CCK_RATE_2MB;
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case 0x37:
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return IEEE80211_CCK_RATE_5MB;
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case 0x6E:
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return IEEE80211_CCK_RATE_11MB;
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}
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assert(0);
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return 0;
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}
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/* Extract the bitrate out of an OFDM PLCP header. */
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static u8 bcm43xx_plcp_get_bitrate_ofdm(struct bcm43xx_plcp_hdr4 *plcp)
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{
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switch (plcp->raw[0] & 0xF) {
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case 0xB:
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return IEEE80211_OFDM_RATE_6MB;
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case 0xF:
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return IEEE80211_OFDM_RATE_9MB;
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case 0xA:
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return IEEE80211_OFDM_RATE_12MB;
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case 0xE:
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return IEEE80211_OFDM_RATE_18MB;
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case 0x9:
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return IEEE80211_OFDM_RATE_24MB;
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case 0xD:
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return IEEE80211_OFDM_RATE_36MB;
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case 0x8:
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return IEEE80211_OFDM_RATE_48MB;
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case 0xC:
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return IEEE80211_OFDM_RATE_54MB;
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}
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assert(0);
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return 0;
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}
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u8 bcm43xx_plcp_get_ratecode_cck(const u8 bitrate)
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{
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switch (bitrate) {
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case IEEE80211_CCK_RATE_1MB:
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return 0x0A;
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case IEEE80211_CCK_RATE_2MB:
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return 0x14;
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case IEEE80211_CCK_RATE_5MB:
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return 0x37;
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case IEEE80211_CCK_RATE_11MB:
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return 0x6E;
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}
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assert(0);
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return 0;
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}
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u8 bcm43xx_plcp_get_ratecode_ofdm(const u8 bitrate)
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{
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switch (bitrate) {
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case IEEE80211_OFDM_RATE_6MB:
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return 0xB;
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case IEEE80211_OFDM_RATE_9MB:
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return 0xF;
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case IEEE80211_OFDM_RATE_12MB:
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return 0xA;
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case IEEE80211_OFDM_RATE_18MB:
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return 0xE;
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case IEEE80211_OFDM_RATE_24MB:
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return 0x9;
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case IEEE80211_OFDM_RATE_36MB:
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return 0xD;
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case IEEE80211_OFDM_RATE_48MB:
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return 0x8;
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case IEEE80211_OFDM_RATE_54MB:
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return 0xC;
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}
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assert(0);
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return 0;
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}
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static void bcm43xx_generate_plcp_hdr(struct bcm43xx_plcp_hdr4 *plcp,
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const u16 octets, const u8 bitrate,
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const int ofdm_modulation)
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{
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__le32 *data = &(plcp->data);
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__u8 *raw = plcp->raw;
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if (ofdm_modulation) {
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*data = bcm43xx_plcp_get_ratecode_ofdm(bitrate);
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assert(!(octets & 0xF000));
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*data |= (octets << 5);
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*data = cpu_to_le32(*data);
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} else {
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u32 plen;
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plen = octets * 16 / bitrate;
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if ((octets * 16 % bitrate) > 0) {
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plen++;
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if ((bitrate == IEEE80211_CCK_RATE_11MB)
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&& ((octets * 8 % 11) < 4)) {
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raw[1] = 0x84;
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} else
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raw[1] = 0x04;
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} else
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raw[1] = 0x04;
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*data |= cpu_to_le32(plen << 16);
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raw[0] = bcm43xx_plcp_get_ratecode_cck(bitrate);
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}
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}
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static u8 bcm43xx_calc_fallback_rate(u8 bitrate)
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{
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switch (bitrate) {
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case IEEE80211_CCK_RATE_1MB:
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return IEEE80211_CCK_RATE_1MB;
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case IEEE80211_CCK_RATE_2MB:
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return IEEE80211_CCK_RATE_1MB;
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case IEEE80211_CCK_RATE_5MB:
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return IEEE80211_CCK_RATE_2MB;
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case IEEE80211_CCK_RATE_11MB:
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return IEEE80211_CCK_RATE_5MB;
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case IEEE80211_OFDM_RATE_6MB:
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return IEEE80211_CCK_RATE_5MB;
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case IEEE80211_OFDM_RATE_9MB:
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return IEEE80211_OFDM_RATE_6MB;
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case IEEE80211_OFDM_RATE_12MB:
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return IEEE80211_OFDM_RATE_9MB;
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case IEEE80211_OFDM_RATE_18MB:
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return IEEE80211_OFDM_RATE_12MB;
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case IEEE80211_OFDM_RATE_24MB:
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return IEEE80211_OFDM_RATE_18MB;
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case IEEE80211_OFDM_RATE_36MB:
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return IEEE80211_OFDM_RATE_24MB;
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case IEEE80211_OFDM_RATE_48MB:
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return IEEE80211_OFDM_RATE_36MB;
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case IEEE80211_OFDM_RATE_54MB:
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return IEEE80211_OFDM_RATE_48MB;
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}
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assert(0);
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return 0;
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}
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static
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__le16 bcm43xx_calc_duration_id(const struct ieee80211_hdr *wireless_header,
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u8 bitrate)
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{
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const u16 frame_ctl = le16_to_cpu(wireless_header->frame_ctl);
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__le16 duration_id = wireless_header->duration_id;
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switch (WLAN_FC_GET_TYPE(frame_ctl)) {
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case IEEE80211_FTYPE_DATA:
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case IEEE80211_FTYPE_MGMT:
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//TODO: Steal the code from ieee80211, once it is completed there.
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break;
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case IEEE80211_FTYPE_CTL:
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/* Use the original duration/id. */
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break;
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default:
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assert(0);
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}
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return duration_id;
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}
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static inline
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u16 ceiling_div(u16 dividend, u16 divisor)
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{
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return ((dividend + divisor - 1) / divisor);
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}
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static void bcm43xx_generate_rts(const struct bcm43xx_phyinfo *phy,
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struct bcm43xx_txhdr *txhdr,
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u16 *flags,
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u8 bitrate,
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const struct ieee80211_hdr_4addr *wlhdr)
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{
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u16 fctl;
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u16 dur;
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u8 fallback_bitrate;
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int ofdm_modulation;
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int fallback_ofdm_modulation;
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// u8 *sa, *da;
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u16 flen;
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//FIXME sa = ieee80211_get_SA((struct ieee80211_hdr *)wlhdr);
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//FIXME da = ieee80211_get_DA((struct ieee80211_hdr *)wlhdr);
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fallback_bitrate = bcm43xx_calc_fallback_rate(bitrate);
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ofdm_modulation = !(ieee80211_is_cck_rate(bitrate));
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fallback_ofdm_modulation = !(ieee80211_is_cck_rate(fallback_bitrate));
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flen = sizeof(u16) + sizeof(u16) + ETH_ALEN + ETH_ALEN + IEEE80211_FCS_LEN,
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bcm43xx_generate_plcp_hdr((struct bcm43xx_plcp_hdr4 *)(&txhdr->rts_cts_plcp),
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flen, bitrate,
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!ieee80211_is_cck_rate(bitrate));
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bcm43xx_generate_plcp_hdr((struct bcm43xx_plcp_hdr4 *)(&txhdr->rts_cts_fallback_plcp),
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flen, fallback_bitrate,
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!ieee80211_is_cck_rate(fallback_bitrate));
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fctl = IEEE80211_FTYPE_CTL;
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fctl |= IEEE80211_STYPE_RTS;
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dur = le16_to_cpu(wlhdr->duration_id);
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/*FIXME: should we test for dur==0 here and let it unmodified in this case?
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* The following assert checks for this case...
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*/
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assert(dur);
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/*FIXME: The duration calculation is not really correct.
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* I am not 100% sure which bitrate to use. We use the RTS rate here,
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* but this is likely to be wrong.
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*/
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if (phy->type == BCM43xx_PHYTYPE_A) {
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/* Three times SIFS */
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dur += 16 * 3;
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/* Add ACK duration. */
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dur += ceiling_div((16 + 8 * (14 /*bytes*/) + 6) * 10,
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bitrate * 4);
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/* Add CTS duration. */
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dur += ceiling_div((16 + 8 * (14 /*bytes*/) + 6) * 10,
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bitrate * 4);
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} else {
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/* Three times SIFS */
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dur += 10 * 3;
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/* Add ACK duration. */
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dur += ceiling_div(8 * (14 /*bytes*/) * 10,
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bitrate);
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/* Add CTS duration. */
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dur += ceiling_div(8 * (14 /*bytes*/) * 10,
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bitrate);
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}
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txhdr->rts_cts_frame_control = cpu_to_le16(fctl);
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txhdr->rts_cts_dur = cpu_to_le16(dur);
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//printk(BCM43xx_MACFMT " " BCM43xx_MACFMT " " BCM43xx_MACFMT "\n", BCM43xx_MACARG(wlhdr->addr1), BCM43xx_MACARG(wlhdr->addr2), BCM43xx_MACARG(wlhdr->addr3));
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//printk(BCM43xx_MACFMT " " BCM43xx_MACFMT "\n", BCM43xx_MACARG(sa), BCM43xx_MACARG(da));
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memcpy(txhdr->rts_cts_mac1, wlhdr->addr1, ETH_ALEN);//FIXME!
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// memcpy(txhdr->rts_cts_mac2, sa, ETH_ALEN);
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*flags |= BCM43xx_TXHDRFLAG_RTSCTS;
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*flags |= BCM43xx_TXHDRFLAG_RTS;
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if (ofdm_modulation)
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*flags |= BCM43xx_TXHDRFLAG_RTSCTS_OFDM;
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if (fallback_ofdm_modulation)
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*flags |= BCM43xx_TXHDRFLAG_RTSCTSFALLBACK_OFDM;
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}
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void bcm43xx_generate_txhdr(struct bcm43xx_private *bcm,
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struct bcm43xx_txhdr *txhdr,
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const unsigned char *fragment_data,
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const unsigned int fragment_len,
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const int is_first_fragment,
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const u16 cookie)
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{
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const struct bcm43xx_phyinfo *phy = bcm43xx_current_phy(bcm);
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const struct ieee80211_hdr_4addr *wireless_header = (const struct ieee80211_hdr_4addr *)fragment_data;
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const struct ieee80211_security *secinfo = &bcm->ieee->sec;
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u8 bitrate;
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u8 fallback_bitrate;
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int ofdm_modulation;
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int fallback_ofdm_modulation;
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u16 plcp_fragment_len = fragment_len;
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u16 flags = 0;
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u16 control = 0;
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u16 wsec_rate = 0;
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u16 encrypt_frame;
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/* Now construct the TX header. */
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memset(txhdr, 0, sizeof(*txhdr));
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bitrate = bcm->softmac->txrates.default_rate;
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ofdm_modulation = !(ieee80211_is_cck_rate(bitrate));
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fallback_bitrate = bcm43xx_calc_fallback_rate(bitrate);
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fallback_ofdm_modulation = !(ieee80211_is_cck_rate(fallback_bitrate));
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/* Set Frame Control from 80211 header. */
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txhdr->frame_control = wireless_header->frame_ctl;
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/* Copy address1 from 80211 header. */
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memcpy(txhdr->mac1, wireless_header->addr1, 6);
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/* Set the fallback duration ID. */
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txhdr->fallback_dur_id = bcm43xx_calc_duration_id((const struct ieee80211_hdr *)wireless_header,
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fallback_bitrate);
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/* Set the cookie (used as driver internal ID for the frame) */
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txhdr->cookie = cpu_to_le16(cookie);
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/* Hardware appends FCS. */
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plcp_fragment_len += IEEE80211_FCS_LEN;
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/* Hardware encryption. */
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encrypt_frame = le16_to_cpup(&wireless_header->frame_ctl) & IEEE80211_FCTL_PROTECTED;
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if (encrypt_frame && !bcm->ieee->host_encrypt) {
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const struct ieee80211_hdr_3addr *hdr = (struct ieee80211_hdr_3addr *)wireless_header;
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memcpy(txhdr->wep_iv, hdr->payload, 4);
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/* Hardware appends ICV. */
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plcp_fragment_len += 4;
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wsec_rate |= (bcm->key[secinfo->active_key].algorithm << BCM43xx_TXHDR_WSEC_ALGO_SHIFT)
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& BCM43xx_TXHDR_WSEC_ALGO_MASK;
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wsec_rate |= (secinfo->active_key << BCM43xx_TXHDR_WSEC_KEYINDEX_SHIFT)
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& BCM43xx_TXHDR_WSEC_KEYINDEX_MASK;
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}
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/* Generate the PLCP header and the fallback PLCP header. */
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bcm43xx_generate_plcp_hdr((struct bcm43xx_plcp_hdr4 *)(&txhdr->plcp),
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plcp_fragment_len,
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bitrate, ofdm_modulation);
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bcm43xx_generate_plcp_hdr(&txhdr->fallback_plcp, plcp_fragment_len,
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fallback_bitrate, fallback_ofdm_modulation);
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/* Set the CONTROL field */
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if (ofdm_modulation)
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control |= BCM43xx_TXHDRCTL_OFDM;
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if (bcm->short_preamble) //FIXME: could be the other way around, please test
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control |= BCM43xx_TXHDRCTL_SHORT_PREAMBLE;
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control |= (phy->antenna_diversity << BCM43xx_TXHDRCTL_ANTENNADIV_SHIFT)
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& BCM43xx_TXHDRCTL_ANTENNADIV_MASK;
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/* Set the FLAGS field */
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if (!is_multicast_ether_addr(wireless_header->addr1) &&
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!is_broadcast_ether_addr(wireless_header->addr1))
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flags |= BCM43xx_TXHDRFLAG_EXPECTACK;
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if (1 /* FIXME: PS poll?? */)
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flags |= 0x10; // FIXME: unknown meaning.
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if (fallback_ofdm_modulation)
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flags |= BCM43xx_TXHDRFLAG_FALLBACKOFDM;
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if (is_first_fragment)
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flags |= BCM43xx_TXHDRFLAG_FIRSTFRAGMENT;
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/* Set WSEC/RATE field */
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wsec_rate |= (txhdr->plcp.raw[0] << BCM43xx_TXHDR_RATE_SHIFT)
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& BCM43xx_TXHDR_RATE_MASK;
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/* Generate the RTS/CTS packet, if required. */
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/* FIXME: We should first try with CTS-to-self,
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* if we are on 80211g. If we get too many
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* failures (hidden nodes), we should switch back to RTS/CTS.
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*/
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if (0/*FIXME txctl->use_rts_cts*/) {
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bcm43xx_generate_rts(phy, txhdr, &flags,
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0/*FIXME txctl->rts_cts_rate*/,
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wireless_header);
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}
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txhdr->flags = cpu_to_le16(flags);
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txhdr->control = cpu_to_le16(control);
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txhdr->wsec_rate = cpu_to_le16(wsec_rate);
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}
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static s8 bcm43xx_rssi_postprocess(struct bcm43xx_private *bcm,
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u8 in_rssi, int ofdm,
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int adjust_2053, int adjust_2050)
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{
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struct bcm43xx_radioinfo *radio = bcm43xx_current_radio(bcm);
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struct bcm43xx_phyinfo *phy = bcm43xx_current_phy(bcm);
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s32 tmp;
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switch (radio->version) {
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case 0x2050:
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if (ofdm) {
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tmp = in_rssi;
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if (tmp > 127)
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tmp -= 256;
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tmp *= 73;
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tmp /= 64;
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if (adjust_2050)
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tmp += 25;
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else
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tmp -= 3;
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} else {
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if (bcm->sprom.boardflags & BCM43xx_BFL_RSSI) {
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if (in_rssi > 63)
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in_rssi = 63;
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tmp = radio->nrssi_lt[in_rssi];
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tmp = 31 - tmp;
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tmp *= -131;
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tmp /= 128;
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tmp -= 57;
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} else {
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tmp = in_rssi;
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tmp = 31 - tmp;
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tmp *= -149;
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tmp /= 128;
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tmp -= 68;
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}
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if (phy->type == BCM43xx_PHYTYPE_G &&
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adjust_2050)
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tmp += 25;
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}
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break;
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case 0x2060:
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if (in_rssi > 127)
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tmp = in_rssi - 256;
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else
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tmp = in_rssi;
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break;
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default:
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tmp = in_rssi;
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tmp -= 11;
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tmp *= 103;
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tmp /= 64;
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if (adjust_2053)
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tmp -= 109;
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else
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tmp -= 83;
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}
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return (s8)tmp;
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}
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//TODO
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#if 0
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static s8 bcm43xx_rssinoise_postprocess(struct bcm43xx_private *bcm,
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u8 in_rssi)
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{
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struct bcm43xx_phyinfo *phy = bcm43xx_current_phy(bcm);
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s8 ret;
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if (phy->type == BCM43xx_PHYTYPE_A) {
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//TODO: Incomplete specs.
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ret = 0;
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} else
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ret = bcm43xx_rssi_postprocess(bcm, in_rssi, 0, 1, 1);
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return ret;
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}
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#endif
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int bcm43xx_rx(struct bcm43xx_private *bcm,
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struct sk_buff *skb,
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struct bcm43xx_rxhdr *rxhdr)
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{
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struct bcm43xx_radioinfo *radio = bcm43xx_current_radio(bcm);
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|
struct bcm43xx_phyinfo *phy = bcm43xx_current_phy(bcm);
|
|
struct bcm43xx_plcp_hdr4 *plcp;
|
|
struct ieee80211_rx_stats stats;
|
|
struct ieee80211_hdr_4addr *wlhdr;
|
|
u16 frame_ctl;
|
|
int is_packet_for_us = 0;
|
|
int err = -EINVAL;
|
|
const u16 rxflags1 = le16_to_cpu(rxhdr->flags1);
|
|
const u16 rxflags2 = le16_to_cpu(rxhdr->flags2);
|
|
const u16 rxflags3 = le16_to_cpu(rxhdr->flags3);
|
|
const int is_ofdm = !!(rxflags1 & BCM43xx_RXHDR_FLAGS1_OFDM);
|
|
|
|
if (rxflags2 & BCM43xx_RXHDR_FLAGS2_TYPE2FRAME) {
|
|
plcp = (struct bcm43xx_plcp_hdr4 *)(skb->data + 2);
|
|
/* Skip two unknown bytes and the PLCP header. */
|
|
skb_pull(skb, 2 + sizeof(struct bcm43xx_plcp_hdr6));
|
|
} else {
|
|
plcp = (struct bcm43xx_plcp_hdr4 *)(skb->data);
|
|
/* Skip the PLCP header. */
|
|
skb_pull(skb, sizeof(struct bcm43xx_plcp_hdr6));
|
|
}
|
|
/* The SKB contains the PAYLOAD (wireless header + data)
|
|
* at this point. The FCS at the end is stripped.
|
|
*/
|
|
|
|
memset(&stats, 0, sizeof(stats));
|
|
stats.mac_time = le16_to_cpu(rxhdr->mactime);
|
|
stats.rssi = bcm43xx_rssi_postprocess(bcm, rxhdr->rssi, is_ofdm,
|
|
!!(rxflags1 & BCM43xx_RXHDR_FLAGS1_2053RSSIADJ),
|
|
!!(rxflags3 & BCM43xx_RXHDR_FLAGS3_2050RSSIADJ));
|
|
stats.signal = rxhdr->signal_quality; //FIXME
|
|
//TODO stats.noise =
|
|
if (is_ofdm)
|
|
stats.rate = bcm43xx_plcp_get_bitrate_ofdm(plcp);
|
|
else
|
|
stats.rate = bcm43xx_plcp_get_bitrate_cck(plcp);
|
|
//printk("RX ofdm %d, rate == %u\n", is_ofdm, stats.rate);
|
|
stats.received_channel = radio->channel;
|
|
//TODO stats.control =
|
|
stats.mask = IEEE80211_STATMASK_SIGNAL |
|
|
//TODO IEEE80211_STATMASK_NOISE |
|
|
IEEE80211_STATMASK_RATE |
|
|
IEEE80211_STATMASK_RSSI;
|
|
if (phy->type == BCM43xx_PHYTYPE_A)
|
|
stats.freq = IEEE80211_52GHZ_BAND;
|
|
else
|
|
stats.freq = IEEE80211_24GHZ_BAND;
|
|
stats.len = skb->len;
|
|
|
|
bcm->stats.last_rx = jiffies;
|
|
if (bcm->ieee->iw_mode == IW_MODE_MONITOR) {
|
|
err = ieee80211_rx(bcm->ieee, skb, &stats);
|
|
return (err == 0) ? -EINVAL : 0;
|
|
}
|
|
|
|
wlhdr = (struct ieee80211_hdr_4addr *)(skb->data);
|
|
|
|
switch (bcm->ieee->iw_mode) {
|
|
case IW_MODE_ADHOC:
|
|
if (memcmp(wlhdr->addr1, bcm->net_dev->dev_addr, ETH_ALEN) == 0 ||
|
|
memcmp(wlhdr->addr3, bcm->ieee->bssid, ETH_ALEN) == 0 ||
|
|
is_broadcast_ether_addr(wlhdr->addr1) ||
|
|
is_multicast_ether_addr(wlhdr->addr1) ||
|
|
bcm->net_dev->flags & IFF_PROMISC)
|
|
is_packet_for_us = 1;
|
|
break;
|
|
case IW_MODE_INFRA:
|
|
default:
|
|
/* When receiving multicast or broadcast packets, filter out
|
|
the packets we send ourself; we shouldn't see those */
|
|
if (memcmp(wlhdr->addr3, bcm->ieee->bssid, ETH_ALEN) == 0 ||
|
|
memcmp(wlhdr->addr1, bcm->net_dev->dev_addr, ETH_ALEN) == 0 ||
|
|
(memcmp(wlhdr->addr3, bcm->net_dev->dev_addr, ETH_ALEN) &&
|
|
(is_broadcast_ether_addr(wlhdr->addr1) ||
|
|
is_multicast_ether_addr(wlhdr->addr1) ||
|
|
bcm->net_dev->flags & IFF_PROMISC)))
|
|
is_packet_for_us = 1;
|
|
break;
|
|
}
|
|
|
|
frame_ctl = le16_to_cpu(wlhdr->frame_ctl);
|
|
if ((frame_ctl & IEEE80211_FCTL_PROTECTED) && !bcm->ieee->host_decrypt) {
|
|
frame_ctl &= ~IEEE80211_FCTL_PROTECTED;
|
|
wlhdr->frame_ctl = cpu_to_le16(frame_ctl);
|
|
/* trim IV and ICV */
|
|
/* FIXME: this must be done only for WEP encrypted packets */
|
|
if (skb->len < 32) {
|
|
dprintkl(KERN_ERR PFX "RX packet dropped (PROTECTED flag "
|
|
"set and length < 32)\n");
|
|
return -EINVAL;
|
|
} else {
|
|
memmove(skb->data + 4, skb->data, 24);
|
|
skb_pull(skb, 4);
|
|
skb_trim(skb, skb->len - 4);
|
|
stats.len -= 8;
|
|
}
|
|
wlhdr = (struct ieee80211_hdr_4addr *)(skb->data);
|
|
}
|
|
|
|
switch (WLAN_FC_GET_TYPE(frame_ctl)) {
|
|
case IEEE80211_FTYPE_MGMT:
|
|
ieee80211_rx_mgt(bcm->ieee, wlhdr, &stats);
|
|
break;
|
|
case IEEE80211_FTYPE_DATA:
|
|
if (is_packet_for_us) {
|
|
err = ieee80211_rx(bcm->ieee, skb, &stats);
|
|
err = (err == 0) ? -EINVAL : 0;
|
|
}
|
|
break;
|
|
case IEEE80211_FTYPE_CTL:
|
|
break;
|
|
default:
|
|
assert(0);
|
|
return -EINVAL;
|
|
}
|
|
|
|
return err;
|
|
}
|