653 lines
17 KiB
C
653 lines
17 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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Broadcom B43legacy 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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Copyright (C) 2005 Stefano Brivio <stefano.brivio@polimi.it>
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Copyright (C) 2005, 2006 Michael Buesch <m@bues.ch>
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Copyright (C) 2005 Danny van Dyk <kugelfang@gentoo.org>
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Copyright (C) 2005 Andreas Jaggi <andreas.jaggi@waterwave.ch>
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Copyright (C) 2007 Larry Finger <Larry.Finger@lwfinger.net>
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*/
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#include <net/dst.h>
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#include "xmit.h"
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#include "phy.h"
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#include "dma.h"
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#include "pio.h"
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/* Extract the bitrate out of a CCK PLCP header. */
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static u8 b43legacy_plcp_get_bitrate_idx_cck(struct b43legacy_plcp_hdr6 *plcp)
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{
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switch (plcp->raw[0]) {
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case 0x0A:
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return 0;
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case 0x14:
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return 1;
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case 0x37:
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return 2;
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case 0x6E:
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return 3;
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}
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B43legacy_BUG_ON(1);
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return -1;
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}
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/* Extract the bitrate out of an OFDM PLCP header. */
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static u8 b43legacy_plcp_get_bitrate_idx_ofdm(struct b43legacy_plcp_hdr6 *plcp,
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bool aphy)
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{
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int base = aphy ? 0 : 4;
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switch (plcp->raw[0] & 0xF) {
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case 0xB:
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return base + 0;
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case 0xF:
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return base + 1;
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case 0xA:
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return base + 2;
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case 0xE:
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return base + 3;
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case 0x9:
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return base + 4;
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case 0xD:
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return base + 5;
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case 0x8:
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return base + 6;
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case 0xC:
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return base + 7;
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}
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B43legacy_BUG_ON(1);
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return -1;
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}
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u8 b43legacy_plcp_get_ratecode_cck(const u8 bitrate)
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{
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switch (bitrate) {
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case B43legacy_CCK_RATE_1MB:
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return 0x0A;
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case B43legacy_CCK_RATE_2MB:
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return 0x14;
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case B43legacy_CCK_RATE_5MB:
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return 0x37;
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case B43legacy_CCK_RATE_11MB:
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return 0x6E;
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}
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B43legacy_BUG_ON(1);
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return 0;
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}
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u8 b43legacy_plcp_get_ratecode_ofdm(const u8 bitrate)
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{
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switch (bitrate) {
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case B43legacy_OFDM_RATE_6MB:
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return 0xB;
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case B43legacy_OFDM_RATE_9MB:
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return 0xF;
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case B43legacy_OFDM_RATE_12MB:
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return 0xA;
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case B43legacy_OFDM_RATE_18MB:
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return 0xE;
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case B43legacy_OFDM_RATE_24MB:
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return 0x9;
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case B43legacy_OFDM_RATE_36MB:
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return 0xD;
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case B43legacy_OFDM_RATE_48MB:
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return 0x8;
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case B43legacy_OFDM_RATE_54MB:
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return 0xC;
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}
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B43legacy_BUG_ON(1);
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return 0;
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}
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void b43legacy_generate_plcp_hdr(struct b43legacy_plcp_hdr4 *plcp,
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const u16 octets, const u8 bitrate)
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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 (b43legacy_is_ofdm_rate(bitrate)) {
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u16 d;
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d = b43legacy_plcp_get_ratecode_ofdm(bitrate);
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B43legacy_WARN_ON(octets & 0xF000);
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d |= (octets << 5);
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*data = cpu_to_le32(d);
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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 == B43legacy_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] = b43legacy_plcp_get_ratecode_cck(bitrate);
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}
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}
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static u8 b43legacy_calc_fallback_rate(u8 bitrate)
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{
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switch (bitrate) {
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case B43legacy_CCK_RATE_1MB:
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return B43legacy_CCK_RATE_1MB;
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case B43legacy_CCK_RATE_2MB:
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return B43legacy_CCK_RATE_1MB;
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case B43legacy_CCK_RATE_5MB:
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return B43legacy_CCK_RATE_2MB;
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case B43legacy_CCK_RATE_11MB:
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return B43legacy_CCK_RATE_5MB;
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case B43legacy_OFDM_RATE_6MB:
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return B43legacy_CCK_RATE_5MB;
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case B43legacy_OFDM_RATE_9MB:
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return B43legacy_OFDM_RATE_6MB;
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case B43legacy_OFDM_RATE_12MB:
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return B43legacy_OFDM_RATE_9MB;
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case B43legacy_OFDM_RATE_18MB:
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return B43legacy_OFDM_RATE_12MB;
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case B43legacy_OFDM_RATE_24MB:
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return B43legacy_OFDM_RATE_18MB;
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case B43legacy_OFDM_RATE_36MB:
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return B43legacy_OFDM_RATE_24MB;
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case B43legacy_OFDM_RATE_48MB:
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return B43legacy_OFDM_RATE_36MB;
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case B43legacy_OFDM_RATE_54MB:
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return B43legacy_OFDM_RATE_48MB;
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}
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B43legacy_BUG_ON(1);
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return 0;
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}
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static int generate_txhdr_fw3(struct b43legacy_wldev *dev,
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struct b43legacy_txhdr_fw3 *txhdr,
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const unsigned char *fragment_data,
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unsigned int fragment_len,
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struct ieee80211_tx_info *info,
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u16 cookie)
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{
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const struct ieee80211_hdr *wlhdr;
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int use_encryption = !!info->control.hw_key;
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u8 rate;
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struct ieee80211_rate *rate_fb;
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int rate_ofdm;
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int rate_fb_ofdm;
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unsigned int plcp_fragment_len;
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u32 mac_ctl = 0;
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u16 phy_ctl = 0;
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struct ieee80211_rate *tx_rate;
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struct ieee80211_tx_rate *rates;
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wlhdr = (const struct ieee80211_hdr *)fragment_data;
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memset(txhdr, 0, sizeof(*txhdr));
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tx_rate = ieee80211_get_tx_rate(dev->wl->hw, info);
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rate = tx_rate->hw_value;
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rate_ofdm = b43legacy_is_ofdm_rate(rate);
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rate_fb = ieee80211_get_alt_retry_rate(dev->wl->hw, info, 0) ? : tx_rate;
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rate_fb_ofdm = b43legacy_is_ofdm_rate(rate_fb->hw_value);
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txhdr->mac_frame_ctl = wlhdr->frame_control;
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memcpy(txhdr->tx_receiver, wlhdr->addr1, ETH_ALEN);
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/* Calculate duration for fallback rate */
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if ((rate_fb->hw_value == rate) ||
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(wlhdr->duration_id & cpu_to_le16(0x8000)) ||
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(wlhdr->duration_id == cpu_to_le16(0))) {
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/* If the fallback rate equals the normal rate or the
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* dur_id field contains an AID, CFP magic or 0,
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* use the original dur_id field. */
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txhdr->dur_fb = wlhdr->duration_id;
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} else {
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txhdr->dur_fb = ieee80211_generic_frame_duration(dev->wl->hw,
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info->control.vif,
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info->band,
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fragment_len,
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rate_fb);
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}
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plcp_fragment_len = fragment_len + FCS_LEN;
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if (use_encryption) {
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u8 key_idx = info->control.hw_key->hw_key_idx;
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struct b43legacy_key *key;
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int wlhdr_len;
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size_t iv_len;
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B43legacy_WARN_ON(key_idx >= dev->max_nr_keys);
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key = &(dev->key[key_idx]);
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if (key->enabled) {
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/* Hardware appends ICV. */
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plcp_fragment_len += info->control.hw_key->icv_len;
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key_idx = b43legacy_kidx_to_fw(dev, key_idx);
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mac_ctl |= (key_idx << B43legacy_TX4_MAC_KEYIDX_SHIFT) &
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B43legacy_TX4_MAC_KEYIDX;
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mac_ctl |= (key->algorithm <<
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B43legacy_TX4_MAC_KEYALG_SHIFT) &
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B43legacy_TX4_MAC_KEYALG;
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wlhdr_len = ieee80211_hdrlen(wlhdr->frame_control);
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iv_len = min_t(size_t, info->control.hw_key->iv_len,
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ARRAY_SIZE(txhdr->iv));
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memcpy(txhdr->iv, ((u8 *)wlhdr) + wlhdr_len, iv_len);
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} else {
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/* This key is invalid. This might only happen
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* in a short timeframe after machine resume before
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* we were able to reconfigure keys.
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* Drop this packet completely. Do not transmit it
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* unencrypted to avoid leaking information. */
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return -ENOKEY;
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}
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}
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b43legacy_generate_plcp_hdr((struct b43legacy_plcp_hdr4 *)
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(&txhdr->plcp), plcp_fragment_len,
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rate);
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b43legacy_generate_plcp_hdr(&txhdr->plcp_fb, plcp_fragment_len,
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rate_fb->hw_value);
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/* PHY TX Control word */
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if (rate_ofdm)
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phy_ctl |= B43legacy_TX4_PHY_ENC_OFDM;
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if (info->control.rates[0].flags & IEEE80211_TX_RC_USE_SHORT_PREAMBLE)
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phy_ctl |= B43legacy_TX4_PHY_SHORTPRMBL;
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phy_ctl |= B43legacy_TX4_PHY_ANTLAST;
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/* MAC control */
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rates = info->control.rates;
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if (!(info->flags & IEEE80211_TX_CTL_NO_ACK))
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mac_ctl |= B43legacy_TX4_MAC_ACK;
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if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ)
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mac_ctl |= B43legacy_TX4_MAC_HWSEQ;
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if (info->flags & IEEE80211_TX_CTL_FIRST_FRAGMENT)
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mac_ctl |= B43legacy_TX4_MAC_STMSDU;
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if (rate_fb_ofdm)
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mac_ctl |= B43legacy_TX4_MAC_FALLBACKOFDM;
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/* Overwrite rates[0].count to make the retry calculation
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* in the tx status easier. need the actual retry limit to
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* detect whether the fallback rate was used.
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*/
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if ((rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) ||
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(rates[0].count <= dev->wl->hw->conf.long_frame_max_tx_count)) {
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rates[0].count = dev->wl->hw->conf.long_frame_max_tx_count;
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mac_ctl |= B43legacy_TX4_MAC_LONGFRAME;
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} else {
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rates[0].count = dev->wl->hw->conf.short_frame_max_tx_count;
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}
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/* Generate the RTS or CTS-to-self frame */
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if ((rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) ||
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(rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT)) {
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unsigned int len;
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struct ieee80211_hdr *hdr;
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int rts_rate;
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int rts_rate_fb;
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int rts_rate_fb_ofdm;
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rts_rate = ieee80211_get_rts_cts_rate(dev->wl->hw, info)->hw_value;
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rts_rate_fb = b43legacy_calc_fallback_rate(rts_rate);
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rts_rate_fb_ofdm = b43legacy_is_ofdm_rate(rts_rate_fb);
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if (rts_rate_fb_ofdm)
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mac_ctl |= B43legacy_TX4_MAC_CTSFALLBACKOFDM;
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if (rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT) {
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ieee80211_ctstoself_get(dev->wl->hw,
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info->control.vif,
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fragment_data,
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fragment_len, info,
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(struct ieee80211_cts *)
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(txhdr->rts_frame));
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mac_ctl |= B43legacy_TX4_MAC_SENDCTS;
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len = sizeof(struct ieee80211_cts);
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} else {
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ieee80211_rts_get(dev->wl->hw,
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info->control.vif,
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fragment_data, fragment_len, info,
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(struct ieee80211_rts *)
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(txhdr->rts_frame));
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mac_ctl |= B43legacy_TX4_MAC_SENDRTS;
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len = sizeof(struct ieee80211_rts);
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}
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len += FCS_LEN;
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b43legacy_generate_plcp_hdr((struct b43legacy_plcp_hdr4 *)
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(&txhdr->rts_plcp),
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len, rts_rate);
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b43legacy_generate_plcp_hdr(&txhdr->rts_plcp_fb,
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len, rts_rate_fb);
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hdr = (struct ieee80211_hdr *)(&txhdr->rts_frame);
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txhdr->rts_dur_fb = hdr->duration_id;
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}
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/* Magic cookie */
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txhdr->cookie = cpu_to_le16(cookie);
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/* Apply the bitfields */
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txhdr->mac_ctl = cpu_to_le32(mac_ctl);
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txhdr->phy_ctl = cpu_to_le16(phy_ctl);
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return 0;
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}
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int b43legacy_generate_txhdr(struct b43legacy_wldev *dev,
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u8 *txhdr,
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const unsigned char *fragment_data,
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unsigned int fragment_len,
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struct ieee80211_tx_info *info,
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u16 cookie)
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{
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return generate_txhdr_fw3(dev, (struct b43legacy_txhdr_fw3 *)txhdr,
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fragment_data, fragment_len,
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info, cookie);
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}
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static s8 b43legacy_rssi_postprocess(struct b43legacy_wldev *dev,
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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 b43legacy_phy *phy = &dev->phy;
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s32 tmp;
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switch (phy->radio_ver) {
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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 (dev->dev->bus->sprom.boardflags_lo
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& B43legacy_BFL_RSSI) {
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if (in_rssi > 63)
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in_rssi = 63;
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tmp = phy->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 == B43legacy_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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void b43legacy_rx(struct b43legacy_wldev *dev,
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struct sk_buff *skb,
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const void *_rxhdr)
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{
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struct ieee80211_rx_status status;
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struct b43legacy_plcp_hdr6 *plcp;
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struct ieee80211_hdr *wlhdr;
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const struct b43legacy_rxhdr_fw3 *rxhdr = _rxhdr;
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__le16 fctl;
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u16 phystat0;
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u16 phystat3;
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u16 chanstat;
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u16 mactime;
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u32 macstat;
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u16 chanid;
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u8 jssi;
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int padding;
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memset(&status, 0, sizeof(status));
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/* Get metadata about the frame from the header. */
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phystat0 = le16_to_cpu(rxhdr->phy_status0);
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phystat3 = le16_to_cpu(rxhdr->phy_status3);
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jssi = rxhdr->jssi;
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macstat = le16_to_cpu(rxhdr->mac_status);
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mactime = le16_to_cpu(rxhdr->mac_time);
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chanstat = le16_to_cpu(rxhdr->channel);
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if (macstat & B43legacy_RX_MAC_FCSERR)
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dev->wl->ieee_stats.dot11FCSErrorCount++;
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/* Skip PLCP and padding */
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padding = (macstat & B43legacy_RX_MAC_PADDING) ? 2 : 0;
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if (unlikely(skb->len < (sizeof(struct b43legacy_plcp_hdr6) +
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padding))) {
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b43legacydbg(dev->wl, "RX: Packet size underrun (1)\n");
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goto drop;
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}
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plcp = (struct b43legacy_plcp_hdr6 *)(skb->data + padding);
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skb_pull(skb, sizeof(struct b43legacy_plcp_hdr6) + padding);
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/* The skb contains the Wireless Header + payload data now */
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if (unlikely(skb->len < (2+2+6/*minimum hdr*/ + FCS_LEN))) {
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b43legacydbg(dev->wl, "RX: Packet size underrun (2)\n");
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goto drop;
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}
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wlhdr = (struct ieee80211_hdr *)(skb->data);
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fctl = wlhdr->frame_control;
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if ((macstat & B43legacy_RX_MAC_DEC) &&
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!(macstat & B43legacy_RX_MAC_DECERR)) {
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unsigned int keyidx;
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int wlhdr_len;
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int iv_len;
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int icv_len;
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keyidx = ((macstat & B43legacy_RX_MAC_KEYIDX)
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>> B43legacy_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 = b43legacy_kidx_to_raw(dev, keyidx);
|
|
B43legacy_WARN_ON(keyidx >= dev->max_nr_keys);
|
|
|
|
if (dev->key[keyidx].algorithm != B43legacy_SEC_ALGO_NONE) {
|
|
/* Remove PROTECTED flag to mark it as decrypted. */
|
|
B43legacy_WARN_ON(!ieee80211_has_protected(fctl));
|
|
fctl &= ~cpu_to_le16(IEEE80211_FCTL_PROTECTED);
|
|
wlhdr->frame_control = fctl;
|
|
|
|
wlhdr_len = ieee80211_hdrlen(fctl);
|
|
if (unlikely(skb->len < (wlhdr_len + 3))) {
|
|
b43legacydbg(dev->wl, "RX: Packet size"
|
|
" underrun3\n");
|
|
goto drop;
|
|
}
|
|
if (skb->data[wlhdr_len + 3] & (1 << 5)) {
|
|
/* The Ext-IV Bit is set in the "KeyID"
|
|
* octet of the IV.
|
|
*/
|
|
iv_len = 8;
|
|
icv_len = 8;
|
|
} else {
|
|
iv_len = 4;
|
|
icv_len = 4;
|
|
}
|
|
if (unlikely(skb->len < (wlhdr_len + iv_len +
|
|
icv_len))) {
|
|
b43legacydbg(dev->wl, "RX: Packet size"
|
|
" underrun4\n");
|
|
goto drop;
|
|
}
|
|
/* Remove the IV */
|
|
memmove(skb->data + iv_len, skb->data, wlhdr_len);
|
|
skb_pull(skb, iv_len);
|
|
/* Remove the ICV */
|
|
skb_trim(skb, skb->len - icv_len);
|
|
|
|
status.flag |= RX_FLAG_DECRYPTED;
|
|
}
|
|
}
|
|
|
|
status.signal = b43legacy_rssi_postprocess(dev, jssi,
|
|
(phystat0 & B43legacy_RX_PHYST0_OFDM),
|
|
(phystat0 & B43legacy_RX_PHYST0_GAINCTL),
|
|
(phystat3 & B43legacy_RX_PHYST3_TRSTATE));
|
|
/* change to support A PHY */
|
|
if (phystat0 & B43legacy_RX_PHYST0_OFDM)
|
|
status.rate_idx = b43legacy_plcp_get_bitrate_idx_ofdm(plcp, false);
|
|
else
|
|
status.rate_idx = b43legacy_plcp_get_bitrate_idx_cck(plcp);
|
|
status.antenna = !!(phystat0 & B43legacy_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;
|
|
|
|
b43legacy_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_START;
|
|
}
|
|
|
|
chanid = (chanstat & B43legacy_RX_CHAN_ID) >>
|
|
B43legacy_RX_CHAN_ID_SHIFT;
|
|
switch (chanstat & B43legacy_RX_CHAN_PHYTYPE) {
|
|
case B43legacy_PHYTYPE_B:
|
|
case B43legacy_PHYTYPE_G:
|
|
status.band = NL80211_BAND_2GHZ;
|
|
status.freq = chanid + 2400;
|
|
break;
|
|
default:
|
|
b43legacywarn(dev->wl, "Unexpected value for chanstat (0x%X)\n",
|
|
chanstat);
|
|
goto drop;
|
|
}
|
|
|
|
memcpy(IEEE80211_SKB_RXCB(skb), &status, sizeof(status));
|
|
ieee80211_rx_irqsafe(dev->wl->hw, skb);
|
|
|
|
return;
|
|
drop:
|
|
b43legacydbg(dev->wl, "RX: Packet dropped\n");
|
|
dev_kfree_skb_any(skb);
|
|
}
|
|
|
|
void b43legacy_handle_txstatus(struct b43legacy_wldev *dev,
|
|
const struct b43legacy_txstatus *status)
|
|
{
|
|
b43legacy_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 (b43legacy_using_pio(dev))
|
|
b43legacy_pio_handle_txstatus(dev, status);
|
|
else
|
|
b43legacy_dma_handle_txstatus(dev, status);
|
|
}
|
|
|
|
/* Handle TX status report as received through DMA/PIO queues */
|
|
void b43legacy_handle_hwtxstatus(struct b43legacy_wldev *dev,
|
|
const struct b43legacy_hwtxstatus *hw)
|
|
{
|
|
struct b43legacy_txstatus status;
|
|
u8 tmp;
|
|
|
|
status.cookie = le16_to_cpu(hw->cookie);
|
|
status.seq = le16_to_cpu(hw->seq);
|
|
status.phy_stat = hw->phy_stat;
|
|
tmp = hw->count;
|
|
status.frame_count = (tmp >> 4);
|
|
status.rts_count = (tmp & 0x0F);
|
|
tmp = hw->flags << 1;
|
|
status.supp_reason = ((tmp & 0x1C) >> 2);
|
|
status.pm_indicated = !!(tmp & 0x80);
|
|
status.intermediate = !!(tmp & 0x40);
|
|
status.for_ampdu = !!(tmp & 0x20);
|
|
status.acked = !!(tmp & 0x02);
|
|
|
|
b43legacy_handle_txstatus(dev, &status);
|
|
}
|
|
|
|
/* Stop any TX operation on the device (suspend the hardware queues) */
|
|
void b43legacy_tx_suspend(struct b43legacy_wldev *dev)
|
|
{
|
|
if (b43legacy_using_pio(dev))
|
|
b43legacy_pio_freeze_txqueues(dev);
|
|
else
|
|
b43legacy_dma_tx_suspend(dev);
|
|
}
|
|
|
|
/* Resume any TX operation on the device (resume the hardware queues) */
|
|
void b43legacy_tx_resume(struct b43legacy_wldev *dev)
|
|
{
|
|
if (b43legacy_using_pio(dev))
|
|
b43legacy_pio_thaw_txqueues(dev);
|
|
else
|
|
b43legacy_dma_tx_resume(dev);
|
|
}
|
|
|
|
/* Initialize the QoS parameters */
|
|
void b43legacy_qos_init(struct b43legacy_wldev *dev)
|
|
{
|
|
/* FIXME: This function must probably be called from the mac80211
|
|
* config callback. */
|
|
return;
|
|
|
|
b43legacy_hf_write(dev, b43legacy_hf_read(dev) | B43legacy_HF_EDCF);
|
|
/* FIXME kill magic */
|
|
b43legacy_write16(dev, 0x688,
|
|
b43legacy_read16(dev, 0x688) | 0x4);
|
|
|
|
|
|
/*TODO: We might need some stack support here to get the values. */
|
|
}
|