diff options
Diffstat (limited to 'drivers/net/wireless/zd1211rw/zd_mac.c')
-rw-r--r-- | drivers/net/wireless/zd1211rw/zd_mac.c | 402 |
1 files changed, 247 insertions, 155 deletions
diff --git a/drivers/net/wireless/zd1211rw/zd_mac.c b/drivers/net/wireless/zd1211rw/zd_mac.c index e5fedf968c1..2696f95b927 100644 --- a/drivers/net/wireless/zd1211rw/zd_mac.c +++ b/drivers/net/wireless/zd1211rw/zd_mac.c @@ -32,6 +32,8 @@ static void ieee_init(struct ieee80211_device *ieee); static void softmac_init(struct ieee80211softmac_device *sm); +static void set_rts_cts_work(void *d); +static void set_basic_rates_work(void *d); static void housekeeping_init(struct zd_mac *mac); static void housekeeping_enable(struct zd_mac *mac); @@ -46,6 +48,8 @@ int zd_mac_init(struct zd_mac *mac, memset(mac, 0, sizeof(*mac)); spin_lock_init(&mac->lock); mac->netdev = netdev; + INIT_WORK(&mac->set_rts_cts_work, set_rts_cts_work, mac); + INIT_WORK(&mac->set_basic_rates_work, set_basic_rates_work, mac); ieee_init(ieee); softmac_init(ieee80211_priv(netdev)); @@ -213,6 +217,13 @@ int zd_mac_stop(struct net_device *netdev) housekeeping_disable(mac); ieee80211softmac_stop(netdev); + /* Ensure no work items are running or queued from this point */ + cancel_delayed_work(&mac->set_rts_cts_work); + cancel_delayed_work(&mac->set_basic_rates_work); + flush_workqueue(zd_workqueue); + mac->updating_rts_rate = 0; + mac->updating_basic_rates = 0; + zd_chip_disable_hwint(chip); zd_chip_switch_radio_off(chip); zd_chip_disable_int(chip); @@ -286,6 +297,186 @@ u8 zd_mac_get_regdomain(struct zd_mac *mac) return regdomain; } +/* Fallback to lowest rate, if rate is unknown. */ +static u8 rate_to_zd_rate(u8 rate) +{ + switch (rate) { + case IEEE80211_CCK_RATE_2MB: + return ZD_CCK_RATE_2M; + case IEEE80211_CCK_RATE_5MB: + return ZD_CCK_RATE_5_5M; + case IEEE80211_CCK_RATE_11MB: + return ZD_CCK_RATE_11M; + case IEEE80211_OFDM_RATE_6MB: + return ZD_OFDM_RATE_6M; + case IEEE80211_OFDM_RATE_9MB: + return ZD_OFDM_RATE_9M; + case IEEE80211_OFDM_RATE_12MB: + return ZD_OFDM_RATE_12M; + case IEEE80211_OFDM_RATE_18MB: + return ZD_OFDM_RATE_18M; + case IEEE80211_OFDM_RATE_24MB: + return ZD_OFDM_RATE_24M; + case IEEE80211_OFDM_RATE_36MB: + return ZD_OFDM_RATE_36M; + case IEEE80211_OFDM_RATE_48MB: + return ZD_OFDM_RATE_48M; + case IEEE80211_OFDM_RATE_54MB: + return ZD_OFDM_RATE_54M; + } + return ZD_CCK_RATE_1M; +} + +static u16 rate_to_cr_rate(u8 rate) +{ + switch (rate) { + case IEEE80211_CCK_RATE_2MB: + return CR_RATE_1M; + case IEEE80211_CCK_RATE_5MB: + return CR_RATE_5_5M; + case IEEE80211_CCK_RATE_11MB: + return CR_RATE_11M; + case IEEE80211_OFDM_RATE_6MB: + return CR_RATE_6M; + case IEEE80211_OFDM_RATE_9MB: + return CR_RATE_9M; + case IEEE80211_OFDM_RATE_12MB: + return CR_RATE_12M; + case IEEE80211_OFDM_RATE_18MB: + return CR_RATE_18M; + case IEEE80211_OFDM_RATE_24MB: + return CR_RATE_24M; + case IEEE80211_OFDM_RATE_36MB: + return CR_RATE_36M; + case IEEE80211_OFDM_RATE_48MB: + return CR_RATE_48M; + case IEEE80211_OFDM_RATE_54MB: + return CR_RATE_54M; + } + return CR_RATE_1M; +} + +static void try_enable_tx(struct zd_mac *mac) +{ + unsigned long flags; + + spin_lock_irqsave(&mac->lock, flags); + if (mac->updating_rts_rate == 0 && mac->updating_basic_rates == 0) + netif_wake_queue(mac->netdev); + spin_unlock_irqrestore(&mac->lock, flags); +} + +static void set_rts_cts_work(void *d) +{ + struct zd_mac *mac = d; + unsigned long flags; + u8 rts_rate; + unsigned int short_preamble; + + mutex_lock(&mac->chip.mutex); + + spin_lock_irqsave(&mac->lock, flags); + mac->updating_rts_rate = 0; + rts_rate = mac->rts_rate; + short_preamble = mac->short_preamble; + spin_unlock_irqrestore(&mac->lock, flags); + + zd_chip_set_rts_cts_rate_locked(&mac->chip, rts_rate, short_preamble); + mutex_unlock(&mac->chip.mutex); + + try_enable_tx(mac); +} + +static void set_basic_rates_work(void *d) +{ + struct zd_mac *mac = d; + unsigned long flags; + u16 basic_rates; + + mutex_lock(&mac->chip.mutex); + + spin_lock_irqsave(&mac->lock, flags); + mac->updating_basic_rates = 0; + basic_rates = mac->basic_rates; + spin_unlock_irqrestore(&mac->lock, flags); + + zd_chip_set_basic_rates_locked(&mac->chip, basic_rates); + mutex_unlock(&mac->chip.mutex); + + try_enable_tx(mac); +} + +static void bssinfo_change(struct net_device *netdev, u32 changes) +{ + struct zd_mac *mac = zd_netdev_mac(netdev); + struct ieee80211softmac_device *softmac = ieee80211_priv(netdev); + struct ieee80211softmac_bss_info *bssinfo = &softmac->bssinfo; + int need_set_rts_cts = 0; + int need_set_rates = 0; + u16 basic_rates; + unsigned long flags; + + dev_dbg_f(zd_mac_dev(mac), "changes: %x\n", changes); + + if (changes & IEEE80211SOFTMAC_BSSINFOCHG_SHORT_PREAMBLE) { + spin_lock_irqsave(&mac->lock, flags); + mac->short_preamble = bssinfo->short_preamble; + spin_unlock_irqrestore(&mac->lock, flags); + need_set_rts_cts = 1; + } + + if (changes & IEEE80211SOFTMAC_BSSINFOCHG_RATES) { + /* Set RTS rate to highest available basic rate */ + u8 rate = ieee80211softmac_highest_supported_rate(softmac, + &bssinfo->supported_rates, 1); + rate = rate_to_zd_rate(rate); + + spin_lock_irqsave(&mac->lock, flags); + if (rate != mac->rts_rate) { + mac->rts_rate = rate; + need_set_rts_cts = 1; + } + spin_unlock_irqrestore(&mac->lock, flags); + + /* Set basic rates */ + need_set_rates = 1; + if (bssinfo->supported_rates.count == 0) { + /* Allow the device to be flexible */ + basic_rates = CR_RATES_80211B | CR_RATES_80211G; + } else { + int i = 0; + basic_rates = 0; + + for (i = 0; i < bssinfo->supported_rates.count; i++) { + u16 rate = bssinfo->supported_rates.rates[i]; + if ((rate & IEEE80211_BASIC_RATE_MASK) == 0) + continue; + + rate &= ~IEEE80211_BASIC_RATE_MASK; + basic_rates |= rate_to_cr_rate(rate); + } + } + spin_lock_irqsave(&mac->lock, flags); + mac->basic_rates = basic_rates; + spin_unlock_irqrestore(&mac->lock, flags); + } + + /* Schedule any changes we made above */ + + spin_lock_irqsave(&mac->lock, flags); + if (need_set_rts_cts && !mac->updating_rts_rate) { + mac->updating_rts_rate = 1; + netif_stop_queue(mac->netdev); + queue_work(zd_workqueue, &mac->set_rts_cts_work); + } + if (need_set_rates && !mac->updating_basic_rates) { + mac->updating_basic_rates = 1; + netif_stop_queue(mac->netdev); + queue_work(zd_workqueue, &mac->set_basic_rates_work); + } + spin_unlock_irqrestore(&mac->lock, flags); +} + static void set_channel(struct net_device *netdev, u8 channel) { struct zd_mac *mac = zd_netdev_mac(netdev); @@ -295,7 +486,6 @@ static void set_channel(struct net_device *netdev, u8 channel) zd_chip_set_channel(&mac->chip, channel); } -/* TODO: Should not work in Managed mode. */ int zd_mac_request_channel(struct zd_mac *mac, u8 channel) { unsigned long lock_flags; @@ -317,31 +507,22 @@ int zd_mac_request_channel(struct zd_mac *mac, u8 channel) return 0; } -int zd_mac_get_channel(struct zd_mac *mac, u8 *channel, u8 *flags) +u8 zd_mac_get_channel(struct zd_mac *mac) { - struct ieee80211_device *ieee = zd_mac_to_ieee80211(mac); + u8 channel = zd_chip_get_channel(&mac->chip); - *channel = zd_chip_get_channel(&mac->chip); - if (ieee->iw_mode != IW_MODE_INFRA) { - spin_lock_irq(&mac->lock); - *flags = *channel == mac->requested_channel ? - MAC_FIXED_CHANNEL : 0; - spin_unlock(&mac->lock); - } else { - *flags = 0; - } - dev_dbg_f(zd_mac_dev(mac), "channel %u flags %u\n", *channel, *flags); - return 0; + dev_dbg_f(zd_mac_dev(mac), "channel %u\n", channel); + return channel; } /* If wrong rate is given, we are falling back to the slowest rate: 1MBit/s */ -static u8 cs_typed_rate(u8 cs_rate) +static u8 zd_rate_typed(u8 zd_rate) { static const u8 typed_rates[16] = { - [ZD_CS_CCK_RATE_1M] = ZD_CS_CCK|ZD_CS_CCK_RATE_1M, - [ZD_CS_CCK_RATE_2M] = ZD_CS_CCK|ZD_CS_CCK_RATE_2M, - [ZD_CS_CCK_RATE_5_5M] = ZD_CS_CCK|ZD_CS_CCK_RATE_5_5M, - [ZD_CS_CCK_RATE_11M] = ZD_CS_CCK|ZD_CS_CCK_RATE_11M, + [ZD_CCK_RATE_1M] = ZD_CS_CCK|ZD_CCK_RATE_1M, + [ZD_CCK_RATE_2M] = ZD_CS_CCK|ZD_CCK_RATE_2M, + [ZD_CCK_RATE_5_5M] = ZD_CS_CCK|ZD_CCK_RATE_5_5M, + [ZD_CCK_RATE_11M] = ZD_CS_CCK|ZD_CCK_RATE_11M, [ZD_OFDM_RATE_6M] = ZD_CS_OFDM|ZD_OFDM_RATE_6M, [ZD_OFDM_RATE_9M] = ZD_CS_OFDM|ZD_OFDM_RATE_9M, [ZD_OFDM_RATE_12M] = ZD_CS_OFDM|ZD_OFDM_RATE_12M, @@ -353,37 +534,7 @@ static u8 cs_typed_rate(u8 cs_rate) }; ZD_ASSERT(ZD_CS_RATE_MASK == 0x0f); - return typed_rates[cs_rate & ZD_CS_RATE_MASK]; -} - -/* Fallback to lowest rate, if rate is unknown. */ -static u8 rate_to_cs_rate(u8 rate) -{ - switch (rate) { - case IEEE80211_CCK_RATE_2MB: - return ZD_CS_CCK_RATE_2M; - case IEEE80211_CCK_RATE_5MB: - return ZD_CS_CCK_RATE_5_5M; - case IEEE80211_CCK_RATE_11MB: - return ZD_CS_CCK_RATE_11M; - case IEEE80211_OFDM_RATE_6MB: - return ZD_OFDM_RATE_6M; - case IEEE80211_OFDM_RATE_9MB: - return ZD_OFDM_RATE_9M; - case IEEE80211_OFDM_RATE_12MB: - return ZD_OFDM_RATE_12M; - case IEEE80211_OFDM_RATE_18MB: - return ZD_OFDM_RATE_18M; - case IEEE80211_OFDM_RATE_24MB: - return ZD_OFDM_RATE_24M; - case IEEE80211_OFDM_RATE_36MB: - return ZD_OFDM_RATE_36M; - case IEEE80211_OFDM_RATE_48MB: - return ZD_OFDM_RATE_48M; - case IEEE80211_OFDM_RATE_54MB: - return ZD_OFDM_RATE_54M; - } - return ZD_CS_CCK_RATE_1M; + return typed_rates[zd_rate & ZD_CS_RATE_MASK]; } int zd_mac_set_mode(struct zd_mac *mac, u32 mode) @@ -484,13 +635,13 @@ int zd_mac_get_range(struct zd_mac *mac, struct iw_range *range) return 0; } -static int zd_calc_tx_length_us(u8 *service, u8 cs_rate, u16 tx_length) +static int zd_calc_tx_length_us(u8 *service, u8 zd_rate, u16 tx_length) { static const u8 rate_divisor[] = { - [ZD_CS_CCK_RATE_1M] = 1, - [ZD_CS_CCK_RATE_2M] = 2, - [ZD_CS_CCK_RATE_5_5M] = 11, /* bits must be doubled */ - [ZD_CS_CCK_RATE_11M] = 11, + [ZD_CCK_RATE_1M] = 1, + [ZD_CCK_RATE_2M] = 2, + [ZD_CCK_RATE_5_5M] = 11, /* bits must be doubled */ + [ZD_CCK_RATE_11M] = 11, [ZD_OFDM_RATE_6M] = 6, [ZD_OFDM_RATE_9M] = 9, [ZD_OFDM_RATE_12M] = 12, @@ -504,15 +655,15 @@ static int zd_calc_tx_length_us(u8 *service, u8 cs_rate, u16 tx_length) u32 bits = (u32)tx_length * 8; u32 divisor; - divisor = rate_divisor[cs_rate]; + divisor = rate_divisor[zd_rate]; if (divisor == 0) return -EINVAL; - switch (cs_rate) { - case ZD_CS_CCK_RATE_5_5M: + switch (zd_rate) { + case ZD_CCK_RATE_5_5M: bits = (2*bits) + 10; /* round up to the next integer */ break; - case ZD_CS_CCK_RATE_11M: + case ZD_CCK_RATE_11M: if (service) { u32 t = bits % 11; *service &= ~ZD_PLCP_SERVICE_LENGTH_EXTENSION; @@ -532,16 +683,16 @@ enum { R2M_11A = 0x02, }; -static u8 cs_rate_to_modulation(u8 cs_rate, int flags) +static u8 zd_rate_to_modulation(u8 zd_rate, int flags) { u8 modulation; - modulation = cs_typed_rate(cs_rate); + modulation = zd_rate_typed(zd_rate); if (flags & R2M_SHORT_PREAMBLE) { switch (ZD_CS_RATE(modulation)) { - case ZD_CS_CCK_RATE_2M: - case ZD_CS_CCK_RATE_5_5M: - case ZD_CS_CCK_RATE_11M: + case ZD_CCK_RATE_2M: + case ZD_CCK_RATE_5_5M: + case ZD_CCK_RATE_11M: modulation |= ZD_CS_CCK_PREA_SHORT; return modulation; } @@ -558,39 +709,36 @@ static void cs_set_modulation(struct zd_mac *mac, struct zd_ctrlset *cs, { struct ieee80211softmac_device *softmac = ieee80211_priv(mac->netdev); u16 ftype = WLAN_FC_GET_TYPE(le16_to_cpu(hdr->frame_ctl)); - u8 rate, cs_rate; + u8 rate, zd_rate; int is_mgt = (ftype == IEEE80211_FTYPE_MGMT) != 0; + int is_multicast = is_multicast_ether_addr(hdr->addr1); + int short_preamble = ieee80211softmac_short_preamble_ok(softmac, + is_multicast, is_mgt); + int flags = 0; + + /* FIXME: 802.11a? */ + rate = ieee80211softmac_suggest_txrate(softmac, is_multicast, is_mgt); - /* FIXME: 802.11a? short preamble? */ - rate = ieee80211softmac_suggest_txrate(softmac, - is_multicast_ether_addr(hdr->addr1), is_mgt); + if (short_preamble) + flags |= R2M_SHORT_PREAMBLE; - cs_rate = rate_to_cs_rate(rate); - cs->modulation = cs_rate_to_modulation(cs_rate, 0); + zd_rate = rate_to_zd_rate(rate); + cs->modulation = zd_rate_to_modulation(zd_rate, flags); } static void cs_set_control(struct zd_mac *mac, struct zd_ctrlset *cs, struct ieee80211_hdr_4addr *header) { + struct ieee80211softmac_device *softmac = ieee80211_priv(mac->netdev); unsigned int tx_length = le16_to_cpu(cs->tx_length); u16 fctl = le16_to_cpu(header->frame_ctl); u16 ftype = WLAN_FC_GET_TYPE(fctl); u16 stype = WLAN_FC_GET_STYPE(fctl); /* - * CONTROL: - * - start at 0x00 - * - if fragment 0, enable bit 0 + * CONTROL TODO: * - if backoff needed, enable bit 0 * - if burst (backoff not needed) disable bit 0 - * - if multicast, enable bit 1 - * - if PS-POLL frame, enable bit 2 - * - if in INDEPENDENT_BSS mode and zd1205_DestPowerSave, then enable - * bit 4 (FIXME: wtf) - * - if frag_len > RTS threshold, set bit 5 as long if it isnt - * multicast or mgt - * - if bit 5 is set, and we are in OFDM mode, unset bit 5 and set bit - * 7 */ cs->control = 0; @@ -607,17 +755,18 @@ static void cs_set_control(struct zd_mac *mac, struct zd_ctrlset *cs, if (stype == IEEE80211_STYPE_PSPOLL) cs->control |= ZD_CS_PS_POLL_FRAME; + /* Unicast data frames over the threshold should have RTS */ if (!is_multicast_ether_addr(header->addr1) && - ftype != IEEE80211_FTYPE_MGMT && - tx_length > zd_netdev_ieee80211(mac->netdev)->rts) - { - /* FIXME: check the logic */ - if (ZD_CS_TYPE(cs->modulation) == ZD_CS_OFDM) { - /* 802.11g */ - cs->control |= ZD_CS_SELF_CTS; - } else { /* 802.11b */ - cs->control |= ZD_CS_RTS; - } + ftype != IEEE80211_FTYPE_MGMT && + tx_length > zd_netdev_ieee80211(mac->netdev)->rts) + cs->control |= ZD_CS_RTS; + + /* Use CTS-to-self protection if required */ + if (ZD_CS_TYPE(cs->modulation) == ZD_CS_OFDM && + ieee80211softmac_protection_needed(softmac)) { + /* FIXME: avoid sending RTS *and* self-CTS, is that correct? */ + cs->control &= ~ZD_CS_RTS; + cs->control |= ZD_CS_SELF_CTS; } /* FIXME: Management frame? */ @@ -782,9 +931,11 @@ static int is_data_packet_for_us(struct ieee80211_device *ieee, (netdev->flags & IFF_PROMISC); } -/* Filters receiving packets. If it returns 1 send it to ieee80211_rx, if 0 - * return. If an error is detected -EINVAL is returned. ieee80211_rx_mgt() is - * called here. +/* Filters received packets. The function returns 1 if the packet should be + * forwarded to ieee80211_rx(). If the packet should be ignored the function + * returns 0. If an invalid packet is found the function returns -EINVAL. + * + * The function calls ieee80211_rx_mgt() directly. * * It has been based on ieee80211_rx_any. */ @@ -810,9 +961,9 @@ static int filter_rx(struct ieee80211_device *ieee, ieee80211_rx_mgt(ieee, hdr, stats); return 0; case IEEE80211_FTYPE_CTL: - /* Ignore invalid short buffers */ return 0; case IEEE80211_FTYPE_DATA: + /* Ignore invalid short buffers */ if (length < sizeof(struct ieee80211_hdr_3addr)) return -EINVAL; return is_data_packet_for_us(ieee, hdr); @@ -993,6 +1144,7 @@ static void ieee_init(struct ieee80211_device *ieee) static void softmac_init(struct ieee80211softmac_device *sm) { sm->set_channel = set_channel; + sm->bssinfo_change = bssinfo_change; } struct iw_statistics *zd_mac_get_wireless_stats(struct net_device *ndev) @@ -1028,66 +1180,6 @@ struct iw_statistics *zd_mac_get_wireless_stats(struct net_device *ndev) return iw_stats; } -#ifdef DEBUG -static const char* decryption_types[] = { - [ZD_RX_NO_WEP] = "none", - [ZD_RX_WEP64] = "WEP64", - [ZD_RX_TKIP] = "TKIP", - [ZD_RX_AES] = "AES", - [ZD_RX_WEP128] = "WEP128", - [ZD_RX_WEP256] = "WEP256", -}; - -static const char *decryption_type_string(u8 type) -{ - const char *s; - - if (type < ARRAY_SIZE(decryption_types)) { - s = decryption_types[type]; - } else { - s = NULL; - } - return s ? s : "unknown"; -} - -static int is_ofdm(u8 frame_status) -{ - return (frame_status & ZD_RX_OFDM); -} - -void zd_dump_rx_status(const struct rx_status *status) -{ - const char* modulation; - u8 quality; - - if (is_ofdm(status->frame_status)) { - modulation = "ofdm"; - quality = status->signal_quality_ofdm; - } else { - modulation = "cck"; - quality = status->signal_quality_cck; - } - pr_debug("rx status %s strength %#04x qual %#04x decryption %s\n", - modulation, status->signal_strength, quality, - decryption_type_string(status->decryption_type)); - if (status->frame_status & ZD_RX_ERROR) { - pr_debug("rx error %s%s%s%s%s%s\n", - (status->frame_status & ZD_RX_TIMEOUT_ERROR) ? - "timeout " : "", - (status->frame_status & ZD_RX_FIFO_OVERRUN_ERROR) ? - "fifo " : "", - (status->frame_status & ZD_RX_DECRYPTION_ERROR) ? - "decryption " : "", - (status->frame_status & ZD_RX_CRC32_ERROR) ? - "crc32 " : "", - (status->frame_status & ZD_RX_NO_ADDR1_MATCH_ERROR) ? - "addr1 " : "", - (status->frame_status & ZD_RX_CRC16_ERROR) ? - "crc16" : ""); - } -} -#endif /* DEBUG */ - #define LINK_LED_WORK_DELAY HZ static void link_led_handler(void *p) |