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path: root/drivers/net/wireless/zd1211rw/zd_mac.c
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Diffstat (limited to 'drivers/net/wireless/zd1211rw/zd_mac.c')
-rw-r--r--drivers/net/wireless/zd1211rw/zd_mac.c1057
1 files changed, 1057 insertions, 0 deletions
diff --git a/drivers/net/wireless/zd1211rw/zd_mac.c b/drivers/net/wireless/zd1211rw/zd_mac.c
new file mode 100644
index 00000000000..d6f3e02a0b5
--- /dev/null
+++ b/drivers/net/wireless/zd1211rw/zd_mac.c
@@ -0,0 +1,1057 @@
+/* zd_mac.c
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/wireless.h>
+#include <linux/usb.h>
+#include <linux/jiffies.h>
+#include <net/ieee80211_radiotap.h>
+
+#include "zd_def.h"
+#include "zd_chip.h"
+#include "zd_mac.h"
+#include "zd_ieee80211.h"
+#include "zd_netdev.h"
+#include "zd_rf.h"
+#include "zd_util.h"
+
+static void ieee_init(struct ieee80211_device *ieee);
+static void softmac_init(struct ieee80211softmac_device *sm);
+
+int zd_mac_init(struct zd_mac *mac,
+ struct net_device *netdev,
+ struct usb_interface *intf)
+{
+ struct ieee80211_device *ieee = zd_netdev_ieee80211(netdev);
+
+ memset(mac, 0, sizeof(*mac));
+ spin_lock_init(&mac->lock);
+ mac->netdev = netdev;
+
+ ieee_init(ieee);
+ softmac_init(ieee80211_priv(netdev));
+ zd_chip_init(&mac->chip, netdev, intf);
+ return 0;
+}
+
+static int reset_channel(struct zd_mac *mac)
+{
+ int r;
+ unsigned long flags;
+ const struct channel_range *range;
+
+ spin_lock_irqsave(&mac->lock, flags);
+ range = zd_channel_range(mac->regdomain);
+ if (!range->start) {
+ r = -EINVAL;
+ goto out;
+ }
+ mac->requested_channel = range->start;
+ r = 0;
+out:
+ spin_unlock_irqrestore(&mac->lock, flags);
+ return r;
+}
+
+int zd_mac_init_hw(struct zd_mac *mac, u8 device_type)
+{
+ int r;
+ struct zd_chip *chip = &mac->chip;
+ u8 addr[ETH_ALEN];
+ u8 default_regdomain;
+
+ r = zd_chip_enable_int(chip);
+ if (r)
+ goto out;
+ r = zd_chip_init_hw(chip, device_type);
+ if (r)
+ goto disable_int;
+
+ zd_get_e2p_mac_addr(chip, addr);
+ r = zd_write_mac_addr(chip, addr);
+ if (r)
+ goto disable_int;
+ ZD_ASSERT(!irqs_disabled());
+ spin_lock_irq(&mac->lock);
+ memcpy(mac->netdev->dev_addr, addr, ETH_ALEN);
+ spin_unlock_irq(&mac->lock);
+
+ r = zd_read_regdomain(chip, &default_regdomain);
+ if (r)
+ goto disable_int;
+ if (!zd_regdomain_supported(default_regdomain)) {
+ dev_dbg_f(zd_mac_dev(mac),
+ "Regulatory Domain %#04x is not supported.\n",
+ default_regdomain);
+ r = -EINVAL;
+ goto disable_int;
+ }
+ spin_lock_irq(&mac->lock);
+ mac->regdomain = mac->default_regdomain = default_regdomain;
+ spin_unlock_irq(&mac->lock);
+ r = reset_channel(mac);
+ if (r)
+ goto disable_int;
+
+ /* We must inform the device that we are doing encryption/decryption in
+ * software at the moment. */
+ r = zd_set_encryption_type(chip, ENC_SNIFFER);
+ if (r)
+ goto disable_int;
+
+ r = zd_geo_init(zd_mac_to_ieee80211(mac), mac->regdomain);
+ if (r)
+ goto disable_int;
+
+ r = 0;
+disable_int:
+ zd_chip_disable_int(chip);
+out:
+ return r;
+}
+
+void zd_mac_clear(struct zd_mac *mac)
+{
+ /* Aquire the lock. */
+ spin_lock(&mac->lock);
+ spin_unlock(&mac->lock);
+ zd_chip_clear(&mac->chip);
+ memset(mac, 0, sizeof(*mac));
+}
+
+static int reset_mode(struct zd_mac *mac)
+{
+ struct ieee80211_device *ieee = zd_mac_to_ieee80211(mac);
+ struct zd_ioreq32 ioreqs[3] = {
+ { CR_RX_FILTER, STA_RX_FILTER },
+ { CR_SNIFFER_ON, 0U },
+ };
+
+ if (ieee->iw_mode == IW_MODE_MONITOR) {
+ ioreqs[0].value = 0xffffffff;
+ ioreqs[1].value = 0x1;
+ ioreqs[2].value = ENC_SNIFFER;
+ }
+
+ return zd_iowrite32a(&mac->chip, ioreqs, 3);
+}
+
+int zd_mac_open(struct net_device *netdev)
+{
+ struct zd_mac *mac = zd_netdev_mac(netdev);
+ struct zd_chip *chip = &mac->chip;
+ int r;
+
+ r = zd_chip_enable_int(chip);
+ if (r < 0)
+ goto out;
+
+ r = zd_chip_set_basic_rates(chip, CR_RATES_80211B | CR_RATES_80211G);
+ if (r < 0)
+ goto disable_int;
+ r = reset_mode(mac);
+ if (r)
+ goto disable_int;
+ r = zd_chip_switch_radio_on(chip);
+ if (r < 0)
+ goto disable_int;
+ r = zd_chip_set_channel(chip, mac->requested_channel);
+ if (r < 0)
+ goto disable_radio;
+ r = zd_chip_enable_rx(chip);
+ if (r < 0)
+ goto disable_radio;
+ r = zd_chip_enable_hwint(chip);
+ if (r < 0)
+ goto disable_rx;
+
+ ieee80211softmac_start(netdev);
+ return 0;
+disable_rx:
+ zd_chip_disable_rx(chip);
+disable_radio:
+ zd_chip_switch_radio_off(chip);
+disable_int:
+ zd_chip_disable_int(chip);
+out:
+ return r;
+}
+
+int zd_mac_stop(struct net_device *netdev)
+{
+ struct zd_mac *mac = zd_netdev_mac(netdev);
+ struct zd_chip *chip = &mac->chip;
+
+ netif_stop_queue(netdev);
+
+ /*
+ * The order here deliberately is a little different from the open()
+ * method, since we need to make sure there is no opportunity for RX
+ * frames to be processed by softmac after we have stopped it.
+ */
+
+ zd_chip_disable_rx(chip);
+ ieee80211softmac_stop(netdev);
+
+ zd_chip_disable_hwint(chip);
+ zd_chip_switch_radio_off(chip);
+ zd_chip_disable_int(chip);
+
+ return 0;
+}
+
+int zd_mac_set_mac_address(struct net_device *netdev, void *p)
+{
+ int r;
+ unsigned long flags;
+ struct sockaddr *addr = p;
+ struct zd_mac *mac = zd_netdev_mac(netdev);
+ struct zd_chip *chip = &mac->chip;
+
+ if (!is_valid_ether_addr(addr->sa_data))
+ return -EADDRNOTAVAIL;
+
+ dev_dbg_f(zd_mac_dev(mac),
+ "Setting MAC to " MAC_FMT "\n", MAC_ARG(addr->sa_data));
+
+ r = zd_write_mac_addr(chip, addr->sa_data);
+ if (r)
+ return r;
+
+ spin_lock_irqsave(&mac->lock, flags);
+ memcpy(netdev->dev_addr, addr->sa_data, ETH_ALEN);
+ spin_unlock_irqrestore(&mac->lock, flags);
+
+ return 0;
+}
+
+int zd_mac_set_regdomain(struct zd_mac *mac, u8 regdomain)
+{
+ int r;
+ u8 channel;
+
+ ZD_ASSERT(!irqs_disabled());
+ spin_lock_irq(&mac->lock);
+ if (regdomain == 0) {
+ regdomain = mac->default_regdomain;
+ }
+ if (!zd_regdomain_supported(regdomain)) {
+ spin_unlock_irq(&mac->lock);
+ return -EINVAL;
+ }
+ mac->regdomain = regdomain;
+ channel = mac->requested_channel;
+ spin_unlock_irq(&mac->lock);
+
+ r = zd_geo_init(zd_mac_to_ieee80211(mac), regdomain);
+ if (r)
+ return r;
+ if (!zd_regdomain_supports_channel(regdomain, channel)) {
+ r = reset_channel(mac);
+ if (r)
+ return r;
+ }
+
+ return 0;
+}
+
+u8 zd_mac_get_regdomain(struct zd_mac *mac)
+{
+ unsigned long flags;
+ u8 regdomain;
+
+ spin_lock_irqsave(&mac->lock, flags);
+ regdomain = mac->regdomain;
+ spin_unlock_irqrestore(&mac->lock, flags);
+ return regdomain;
+}
+
+static void set_channel(struct net_device *netdev, u8 channel)
+{
+ struct zd_mac *mac = zd_netdev_mac(netdev);
+
+ dev_dbg_f(zd_mac_dev(mac), "channel %d\n", 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;
+ struct ieee80211_device *ieee = zd_mac_to_ieee80211(mac);
+
+ if (ieee->iw_mode == IW_MODE_INFRA)
+ return -EPERM;
+
+ spin_lock_irqsave(&mac->lock, lock_flags);
+ if (!zd_regdomain_supports_channel(mac->regdomain, channel)) {
+ spin_unlock_irqrestore(&mac->lock, lock_flags);
+ return -EINVAL;
+ }
+ mac->requested_channel = channel;
+ spin_unlock_irqrestore(&mac->lock, lock_flags);
+ if (netif_running(mac->netdev))
+ return zd_chip_set_channel(&mac->chip, channel);
+ else
+ return 0;
+}
+
+int zd_mac_get_channel(struct zd_mac *mac, u8 *channel, u8 *flags)
+{
+ struct ieee80211_device *ieee = zd_mac_to_ieee80211(mac);
+
+ *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;
+}
+
+/* If wrong rate is given, we are falling back to the slowest rate: 1MBit/s */
+static u8 cs_typed_rate(u8 cs_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_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,
+ [ZD_OFDM_RATE_18M] = ZD_CS_OFDM|ZD_OFDM_RATE_18M,
+ [ZD_OFDM_RATE_24M] = ZD_CS_OFDM|ZD_OFDM_RATE_24M,
+ [ZD_OFDM_RATE_36M] = ZD_CS_OFDM|ZD_OFDM_RATE_36M,
+ [ZD_OFDM_RATE_48M] = ZD_CS_OFDM|ZD_OFDM_RATE_48M,
+ [ZD_OFDM_RATE_54M] = ZD_CS_OFDM|ZD_OFDM_RATE_54M,
+ };
+
+ 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;
+}
+
+int zd_mac_set_mode(struct zd_mac *mac, u32 mode)
+{
+ struct ieee80211_device *ieee;
+
+ switch (mode) {
+ case IW_MODE_AUTO:
+ case IW_MODE_ADHOC:
+ case IW_MODE_INFRA:
+ mac->netdev->type = ARPHRD_ETHER;
+ break;
+ case IW_MODE_MONITOR:
+ mac->netdev->type = ARPHRD_IEEE80211_RADIOTAP;
+ break;
+ default:
+ dev_dbg_f(zd_mac_dev(mac), "wrong mode %u\n", mode);
+ return -EINVAL;
+ }
+
+ ieee = zd_mac_to_ieee80211(mac);
+ ZD_ASSERT(!irqs_disabled());
+ spin_lock_irq(&ieee->lock);
+ ieee->iw_mode = mode;
+ spin_unlock_irq(&ieee->lock);
+
+ if (netif_running(mac->netdev))
+ return reset_mode(mac);
+
+ return 0;
+}
+
+int zd_mac_get_mode(struct zd_mac *mac, u32 *mode)
+{
+ unsigned long flags;
+ struct ieee80211_device *ieee;
+
+ ieee = zd_mac_to_ieee80211(mac);
+ spin_lock_irqsave(&ieee->lock, flags);
+ *mode = ieee->iw_mode;
+ spin_unlock_irqrestore(&ieee->lock, flags);
+ return 0;
+}
+
+int zd_mac_get_range(struct zd_mac *mac, struct iw_range *range)
+{
+ int i;
+ const struct channel_range *channel_range;
+ u8 regdomain;
+
+ memset(range, 0, sizeof(*range));
+
+ /* FIXME: Not so important and depends on the mode. For 802.11g
+ * usually this value is used. It seems to be that Bit/s number is
+ * given here.
+ */
+ range->throughput = 27 * 1000 * 1000;
+
+ range->max_qual.qual = 100;
+ range->max_qual.level = 100;
+
+ /* FIXME: Needs still to be tuned. */
+ range->avg_qual.qual = 71;
+ range->avg_qual.level = 80;
+
+ /* FIXME: depends on standard? */
+ range->min_rts = 256;
+ range->max_rts = 2346;
+
+ range->min_frag = MIN_FRAG_THRESHOLD;
+ range->max_frag = MAX_FRAG_THRESHOLD;
+
+ range->max_encoding_tokens = WEP_KEYS;
+ range->num_encoding_sizes = 2;
+ range->encoding_size[0] = 5;
+ range->encoding_size[1] = WEP_KEY_LEN;
+
+ range->we_version_compiled = WIRELESS_EXT;
+ range->we_version_source = 20;
+
+ ZD_ASSERT(!irqs_disabled());
+ spin_lock_irq(&mac->lock);
+ regdomain = mac->regdomain;
+ spin_unlock_irq(&mac->lock);
+ channel_range = zd_channel_range(regdomain);
+
+ range->num_channels = channel_range->end - channel_range->start;
+ range->old_num_channels = range->num_channels;
+ range->num_frequency = range->num_channels;
+ range->old_num_frequency = range->num_frequency;
+
+ for (i = 0; i < range->num_frequency; i++) {
+ struct iw_freq *freq = &range->freq[i];
+ freq->i = channel_range->start + i;
+ zd_channel_to_freq(freq, freq->i);
+ }
+
+ return 0;
+}
+
+static int zd_calc_tx_length_us(u8 *service, u8 cs_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_OFDM_RATE_6M] = 6,
+ [ZD_OFDM_RATE_9M] = 9,
+ [ZD_OFDM_RATE_12M] = 12,
+ [ZD_OFDM_RATE_18M] = 18,
+ [ZD_OFDM_RATE_24M] = 24,
+ [ZD_OFDM_RATE_36M] = 36,
+ [ZD_OFDM_RATE_48M] = 48,
+ [ZD_OFDM_RATE_54M] = 54,
+ };
+
+ u32 bits = (u32)tx_length * 8;
+ u32 divisor;
+
+ divisor = rate_divisor[cs_rate];
+ if (divisor == 0)
+ return -EINVAL;
+
+ switch (cs_rate) {
+ case ZD_CS_CCK_RATE_5_5M:
+ bits = (2*bits) + 10; /* round up to the next integer */
+ break;
+ case ZD_CS_CCK_RATE_11M:
+ if (service) {
+ u32 t = bits % 11;
+ *service &= ~ZD_PLCP_SERVICE_LENGTH_EXTENSION;
+ if (0 < t && t <= 3) {
+ *service |= ZD_PLCP_SERVICE_LENGTH_EXTENSION;
+ }
+ }
+ bits += 10; /* round up to the next integer */
+ break;
+ }
+
+ return bits/divisor;
+}
+
+enum {
+ R2M_SHORT_PREAMBLE = 0x01,
+ R2M_11A = 0x02,
+};
+
+static u8 cs_rate_to_modulation(u8 cs_rate, int flags)
+{
+ u8 modulation;
+
+ modulation = cs_typed_rate(cs_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:
+ modulation |= ZD_CS_CCK_PREA_SHORT;
+ return modulation;
+ }
+ }
+ if (flags & R2M_11A) {
+ if (ZD_CS_TYPE(modulation) == ZD_CS_OFDM)
+ modulation |= ZD_CS_OFDM_MODE_11A;
+ }
+ return modulation;
+}
+
+static void cs_set_modulation(struct zd_mac *mac, struct zd_ctrlset *cs,
+ struct ieee80211_hdr_4addr *hdr)
+{
+ struct ieee80211softmac_device *softmac = ieee80211_priv(mac->netdev);
+ u16 ftype = WLAN_FC_GET_TYPE(le16_to_cpu(hdr->frame_ctl));
+ u8 rate, cs_rate;
+ int is_mgt = (ftype == IEEE80211_FTYPE_MGMT) != 0;
+
+ /* FIXME: 802.11a? short preamble? */
+ rate = ieee80211softmac_suggest_txrate(softmac,
+ is_multicast_ether_addr(hdr->addr1), is_mgt);
+
+ cs_rate = rate_to_cs_rate(rate);
+ cs->modulation = cs_rate_to_modulation(cs_rate, 0);
+}
+
+static void cs_set_control(struct zd_mac *mac, struct zd_ctrlset *cs,
+ struct ieee80211_hdr_4addr *header)
+{
+ 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
+ * - 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;
+
+ /* First fragment */
+ if (WLAN_GET_SEQ_FRAG(le16_to_cpu(header->seq_ctl)) == 0)
+ cs->control |= ZD_CS_NEED_RANDOM_BACKOFF;
+
+ /* Multicast */
+ if (is_multicast_ether_addr(header->addr1))
+ cs->control |= ZD_CS_MULTICAST;
+
+ /* PS-POLL */
+ if (stype == IEEE80211_STYPE_PSPOLL)
+ cs->control |= ZD_CS_PS_POLL_FRAME;
+
+ 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;
+ }
+ }
+
+ /* FIXME: Management frame? */
+}
+
+static int fill_ctrlset(struct zd_mac *mac,
+ struct ieee80211_txb *txb,
+ int frag_num)
+{
+ int r;
+ struct sk_buff *skb = txb->fragments[frag_num];
+ struct ieee80211_hdr_4addr *hdr =
+ (struct ieee80211_hdr_4addr *) skb->data;
+ unsigned int frag_len = skb->len + IEEE80211_FCS_LEN;
+ unsigned int next_frag_len;
+ unsigned int packet_length;
+ struct zd_ctrlset *cs = (struct zd_ctrlset *)
+ skb_push(skb, sizeof(struct zd_ctrlset));
+
+ if (frag_num+1 < txb->nr_frags) {
+ next_frag_len = txb->fragments[frag_num+1]->len +
+ IEEE80211_FCS_LEN;
+ } else {
+ next_frag_len = 0;
+ }
+ ZD_ASSERT(frag_len <= 0xffff);
+ ZD_ASSERT(next_frag_len <= 0xffff);
+
+ cs_set_modulation(mac, cs, hdr);
+
+ cs->tx_length = cpu_to_le16(frag_len);
+
+ cs_set_control(mac, cs, hdr);
+
+ packet_length = frag_len + sizeof(struct zd_ctrlset) + 10;
+ ZD_ASSERT(packet_length <= 0xffff);
+ /* ZD1211B: Computing the length difference this way, gives us
+ * flexibility to compute the packet length.
+ */
+ cs->packet_length = cpu_to_le16(mac->chip.is_zd1211b ?
+ packet_length - frag_len : packet_length);
+
+ /*
+ * CURRENT LENGTH:
+ * - transmit frame length in microseconds
+ * - seems to be derived from frame length
+ * - see Cal_Us_Service() in zdinlinef.h
+ * - if macp->bTxBurstEnable is enabled, then multiply by 4
+ * - bTxBurstEnable is never set in the vendor driver
+ *
+ * SERVICE:
+ * - "for PLCP configuration"
+ * - always 0 except in some situations at 802.11b 11M
+ * - see line 53 of zdinlinef.h
+ */
+ cs->service = 0;
+ r = zd_calc_tx_length_us(&cs->service, ZD_CS_RATE(cs->modulation),
+ le16_to_cpu(cs->tx_length));
+ if (r < 0)
+ return r;
+ cs->current_length = cpu_to_le16(r);
+
+ if (next_frag_len == 0) {
+ cs->next_frame_length = 0;
+ } else {
+ r = zd_calc_tx_length_us(NULL, ZD_CS_RATE(cs->modulation),
+ next_frag_len);
+ if (r < 0)
+ return r;
+ cs->next_frame_length = cpu_to_le16(r);
+ }
+
+ return 0;
+}
+
+static int zd_mac_tx(struct zd_mac *mac, struct ieee80211_txb *txb, int pri)
+{
+ int i, r;
+
+ for (i = 0; i < txb->nr_frags; i++) {
+ struct sk_buff *skb = txb->fragments[i];
+
+ r = fill_ctrlset(mac, txb, i);
+ if (r)
+ return r;
+ r = zd_usb_tx(&mac->chip.usb, skb->data, skb->len);
+ if (r)
+ return r;
+ }
+
+ /* FIXME: shouldn't this be handled by the upper layers? */
+ mac->netdev->trans_start = jiffies;
+
+ ieee80211_txb_free(txb);
+ return 0;
+}
+
+struct zd_rt_hdr {
+ struct ieee80211_radiotap_header rt_hdr;
+ u8 rt_flags;
+ u8 rt_rate;
+ u16 rt_channel;
+ u16 rt_chbitmask;
+} __attribute__((packed));
+
+static void fill_rt_header(void *buffer, struct zd_mac *mac,
+ const struct ieee80211_rx_stats *stats,
+ const struct rx_status *status)
+{
+ struct zd_rt_hdr *hdr = buffer;
+
+ hdr->rt_hdr.it_version = PKTHDR_RADIOTAP_VERSION;
+ hdr->rt_hdr.it_pad = 0;
+ hdr->rt_hdr.it_len = cpu_to_le16(sizeof(struct zd_rt_hdr));
+ hdr->rt_hdr.it_present = cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) |
+ (1 << IEEE80211_RADIOTAP_CHANNEL) |
+ (1 << IEEE80211_RADIOTAP_RATE));
+
+ hdr->rt_flags = 0;
+ if (status->decryption_type & (ZD_RX_WEP64|ZD_RX_WEP128|ZD_RX_WEP256))
+ hdr->rt_flags |= IEEE80211_RADIOTAP_F_WEP;
+
+ hdr->rt_rate = stats->rate / 5;
+
+ /* FIXME: 802.11a */
+ hdr->rt_channel = cpu_to_le16(ieee80211chan2mhz(
+ _zd_chip_get_channel(&mac->chip)));
+ hdr->rt_chbitmask = cpu_to_le16(IEEE80211_CHAN_2GHZ |
+ ((status->frame_status & ZD_RX_FRAME_MODULATION_MASK) ==
+ ZD_RX_OFDM ? IEEE80211_CHAN_OFDM : IEEE80211_CHAN_CCK));
+}
+
+/* Returns 1 if the data packet is for us and 0 otherwise. */
+static int is_data_packet_for_us(struct ieee80211_device *ieee,
+ struct ieee80211_hdr_4addr *hdr)
+{
+ struct net_device *netdev = ieee->dev;
+ u16 fc = le16_to_cpu(hdr->frame_ctl);
+
+ ZD_ASSERT(WLAN_FC_GET_TYPE(fc) == IEEE80211_FTYPE_DATA);
+
+ switch (ieee->iw_mode) {
+ case IW_MODE_ADHOC:
+ if ((fc & (IEEE80211_FCTL_TODS|IEEE80211_FCTL_FROMDS)) != 0 ||
+ memcmp(hdr->addr3, ieee->bssid, ETH_ALEN) != 0)
+ return 0;
+ break;
+ case IW_MODE_AUTO:
+ case IW_MODE_INFRA:
+ if ((fc & (IEEE80211_FCTL_TODS|IEEE80211_FCTL_FROMDS)) !=
+ IEEE80211_FCTL_FROMDS ||
+ memcmp(hdr->addr2, ieee->bssid, ETH_ALEN) != 0)
+ return 0;
+ break;
+ default:
+ ZD_ASSERT(ieee->iw_mode != IW_MODE_MONITOR);
+ return 0;
+ }
+
+ return memcmp(hdr->addr1, netdev->dev_addr, ETH_ALEN) == 0 ||
+ is_multicast_ether_addr(hdr->addr1) ||
+ (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.
+ *
+ * It has been based on ieee80211_rx_any.
+ */
+static int filter_rx(struct ieee80211_device *ieee,
+ const u8 *buffer, unsigned int length,
+ struct ieee80211_rx_stats *stats)
+{
+ struct ieee80211_hdr_4addr *hdr;
+ u16 fc;
+
+ if (ieee->iw_mode == IW_MODE_MONITOR)
+ return 1;
+
+ hdr = (struct ieee80211_hdr_4addr *)buffer;
+ fc = le16_to_cpu(hdr->frame_ctl);
+ if ((fc & IEEE80211_FCTL_VERS) != 0)
+ return -EINVAL;
+
+ switch (WLAN_FC_GET_TYPE(fc)) {
+ case IEEE80211_FTYPE_MGMT:
+ if (length < sizeof(struct ieee80211_hdr_3addr))
+ return -EINVAL;
+ ieee80211_rx_mgt(ieee, hdr, stats);
+ return 0;
+ case IEEE80211_FTYPE_CTL:
+ /* Ignore invalid short buffers */
+ return 0;
+ case IEEE80211_FTYPE_DATA:
+ if (length < sizeof(struct ieee80211_hdr_3addr))
+ return -EINVAL;
+ return is_data_packet_for_us(ieee, hdr);
+ }
+
+ return -EINVAL;
+}
+
+static void update_qual_rssi(struct zd_mac *mac, u8 qual_percent, u8 rssi)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&mac->lock, flags);
+ mac->qual_average = (7 * mac->qual_average + qual_percent) / 8;
+ mac->rssi_average = (7 * mac->rssi_average + rssi) / 8;
+ spin_unlock_irqrestore(&mac->lock, flags);
+}
+
+static int fill_rx_stats(struct ieee80211_rx_stats *stats,
+ const struct rx_status **pstatus,
+ struct zd_mac *mac,
+ const u8 *buffer, unsigned int length)
+{
+ const struct rx_status *status;
+
+ *pstatus = status = zd_tail(buffer, length, sizeof(struct rx_status));
+ if (status->frame_status & ZD_RX_ERROR) {
+ /* FIXME: update? */
+ return -EINVAL;
+ }
+ memset(stats, 0, sizeof(struct ieee80211_rx_stats));
+ stats->len = length - (ZD_PLCP_HEADER_SIZE + IEEE80211_FCS_LEN +
+ + sizeof(struct rx_status));
+ /* FIXME: 802.11a */
+ stats->freq = IEEE80211_24GHZ_BAND;
+ stats->received_channel = _zd_chip_get_channel(&mac->chip);
+ stats->rssi = zd_rx_strength_percent(status->signal_strength);
+ stats->signal = zd_rx_qual_percent(buffer,
+ length - sizeof(struct rx_status),
+ status);
+ stats->mask = IEEE80211_STATMASK_RSSI | IEEE80211_STATMASK_SIGNAL;
+ stats->rate = zd_rx_rate(buffer, status);
+ if (stats->rate)
+ stats->mask |= IEEE80211_STATMASK_RATE;
+
+ update_qual_rssi(mac, stats->signal, stats->rssi);
+ return 0;
+}
+
+int zd_mac_rx(struct zd_mac *mac, const u8 *buffer, unsigned int length)
+{
+ int r;
+ struct ieee80211_device *ieee = zd_mac_to_ieee80211(mac);
+ struct ieee80211_rx_stats stats;
+ const struct rx_status *status;
+ struct sk_buff *skb;
+
+ if (length < ZD_PLCP_HEADER_SIZE + IEEE80211_1ADDR_LEN +
+ IEEE80211_FCS_LEN + sizeof(struct rx_status))
+ return -EINVAL;
+
+ r = fill_rx_stats(&stats, &status, mac, buffer, length);
+ if (r)
+ return r;
+
+ length -= ZD_PLCP_HEADER_SIZE+IEEE80211_FCS_LEN+
+ sizeof(struct rx_status);
+ buffer += ZD_PLCP_HEADER_SIZE;
+
+ r = filter_rx(ieee, buffer, length, &stats);
+ if (r <= 0)
+ return r;
+
+ skb = dev_alloc_skb(sizeof(struct zd_rt_hdr) + length);
+ if (!skb)
+ return -ENOMEM;
+ if (ieee->iw_mode == IW_MODE_MONITOR)
+ fill_rt_header(skb_put(skb, sizeof(struct zd_rt_hdr)), mac,
+ &stats, status);
+ memcpy(skb_put(skb, length), buffer, length);
+
+ r = ieee80211_rx(ieee, skb, &stats);
+ if (!r) {
+ ZD_ASSERT(in_irq());
+ dev_kfree_skb_irq(skb);
+ }
+ return 0;
+}
+
+static int netdev_tx(struct ieee80211_txb *txb, struct net_device *netdev,
+ int pri)
+{
+ return zd_mac_tx(zd_netdev_mac(netdev), txb, pri);
+}
+
+static void set_security(struct net_device *netdev,
+ struct ieee80211_security *sec)
+{
+ struct ieee80211_device *ieee = zd_netdev_ieee80211(netdev);
+ struct ieee80211_security *secinfo = &ieee->sec;
+ int keyidx;
+
+ dev_dbg_f(zd_mac_dev(zd_netdev_mac(netdev)), "\n");
+
+ for (keyidx = 0; keyidx<WEP_KEYS; keyidx++)
+ if (sec->flags & (1<<keyidx)) {
+ secinfo->encode_alg[keyidx] = sec->encode_alg[keyidx];
+ secinfo->key_sizes[keyidx] = sec->key_sizes[keyidx];
+ memcpy(secinfo->keys[keyidx], sec->keys[keyidx],
+ SCM_KEY_LEN);
+ }
+
+ if (sec->flags & SEC_ACTIVE_KEY) {
+ secinfo->active_key = sec->active_key;
+ dev_dbg_f(zd_mac_dev(zd_netdev_mac(netdev)),
+ " .active_key = %d\n", sec->active_key);
+ }
+ if (sec->flags & SEC_UNICAST_GROUP) {
+ secinfo->unicast_uses_group = sec->unicast_uses_group;
+ dev_dbg_f(zd_mac_dev(zd_netdev_mac(netdev)),
+ " .unicast_uses_group = %d\n",
+ sec->unicast_uses_group);
+ }
+ if (sec->flags & SEC_LEVEL) {
+ secinfo->level = sec->level;
+ dev_dbg_f(zd_mac_dev(zd_netdev_mac(netdev)),
+ " .level = %d\n", sec->level);
+ }
+ if (sec->flags & SEC_ENABLED) {
+ secinfo->enabled = sec->enabled;
+ dev_dbg_f(zd_mac_dev(zd_netdev_mac(netdev)),
+ " .enabled = %d\n", sec->enabled);
+ }
+ if (sec->flags & SEC_ENCRYPT) {
+ secinfo->encrypt = sec->encrypt;
+ dev_dbg_f(zd_mac_dev(zd_netdev_mac(netdev)),
+ " .encrypt = %d\n", sec->encrypt);
+ }
+ if (sec->flags & SEC_AUTH_MODE) {
+ secinfo->auth_mode = sec->auth_mode;
+ dev_dbg_f(zd_mac_dev(zd_netdev_mac(netdev)),
+ " .auth_mode = %d\n", sec->auth_mode);
+ }
+}
+
+static void ieee_init(struct ieee80211_device *ieee)
+{
+ ieee->mode = IEEE_B | IEEE_G;
+ ieee->freq_band = IEEE80211_24GHZ_BAND;
+ ieee->modulation = IEEE80211_OFDM_MODULATION | IEEE80211_CCK_MODULATION;
+ ieee->tx_headroom = sizeof(struct zd_ctrlset);
+ ieee->set_security = set_security;
+ ieee->hard_start_xmit = netdev_tx;
+
+ /* Software encryption/decryption for now */
+ ieee->host_build_iv = 0;
+ ieee->host_encrypt = 1;
+ ieee->host_decrypt = 1;
+
+ /* FIXME: default to managed mode, until ieee80211 and zd1211rw can
+ * correctly support AUTO */
+ ieee->iw_mode = IW_MODE_INFRA;
+}
+
+static void softmac_init(struct ieee80211softmac_device *sm)
+{
+ sm->set_channel = set_channel;
+}
+
+struct iw_statistics *zd_mac_get_wireless_stats(struct net_device *ndev)
+{
+ struct zd_mac *mac = zd_netdev_mac(ndev);
+ struct iw_statistics *iw_stats = &mac->iw_stats;
+
+ memset(iw_stats, 0, sizeof(struct iw_statistics));
+ /* We are not setting the status, because ieee->state is not updated
+ * at all and this driver doesn't track authentication state.
+ */
+ spin_lock_irq(&mac->lock);
+ iw_stats->qual.qual = mac->qual_average;
+ iw_stats->qual.level = mac->rssi_average;
+ iw_stats->qual.updated = IW_QUAL_QUAL_UPDATED|IW_QUAL_LEVEL_UPDATED|
+ IW_QUAL_NOISE_INVALID;
+ spin_unlock_irq(&mac->lock);
+ /* TODO: update counter */
+ 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 */
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-11 12:23:25 +0000