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path: root/cleopatre/linux-2.6.25.10-spc300/drivers/net/wireless/zd1211rw/zd_mac.c
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Diffstat (limited to 'cleopatre/linux-2.6.25.10-spc300/drivers/net/wireless/zd1211rw/zd_mac.c')
-rw-r--r--cleopatre/linux-2.6.25.10-spc300/drivers/net/wireless/zd1211rw/zd_mac.c995
1 files changed, 995 insertions, 0 deletions
diff --git a/cleopatre/linux-2.6.25.10-spc300/drivers/net/wireless/zd1211rw/zd_mac.c b/cleopatre/linux-2.6.25.10-spc300/drivers/net/wireless/zd1211rw/zd_mac.c
new file mode 100644
index 0000000000..76ef2d8391
--- /dev/null
+++ b/cleopatre/linux-2.6.25.10-spc300/drivers/net/wireless/zd1211rw/zd_mac.c
@@ -0,0 +1,995 @@
+/* ZD1211 USB-WLAN driver for Linux
+ *
+ * Copyright (C) 2005-2007 Ulrich Kunitz <kune@deine-taler.de>
+ * Copyright (C) 2006-2007 Daniel Drake <dsd@gentoo.org>
+ * Copyright (C) 2006-2007 Michael Wu <flamingice@sourmilk.net>
+ * Copyright (c) 2007 Luis R. Rodriguez <mcgrof@winlab.rutgers.edu>
+ *
+ * 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/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_rf.h"
+
+/* This table contains the hardware specific values for the modulation rates. */
+static const struct ieee80211_rate zd_rates[] = {
+ { .rate = 10,
+ .val = ZD_CCK_RATE_1M,
+ .flags = IEEE80211_RATE_CCK },
+ { .rate = 20,
+ .val = ZD_CCK_RATE_2M,
+ .val2 = ZD_CCK_RATE_2M | ZD_CCK_PREA_SHORT,
+ .flags = IEEE80211_RATE_CCK_2 },
+ { .rate = 55,
+ .val = ZD_CCK_RATE_5_5M,
+ .val2 = ZD_CCK_RATE_5_5M | ZD_CCK_PREA_SHORT,
+ .flags = IEEE80211_RATE_CCK_2 },
+ { .rate = 110,
+ .val = ZD_CCK_RATE_11M,
+ .val2 = ZD_CCK_RATE_11M | ZD_CCK_PREA_SHORT,
+ .flags = IEEE80211_RATE_CCK_2 },
+ { .rate = 60,
+ .val = ZD_OFDM_RATE_6M,
+ .flags = IEEE80211_RATE_OFDM },
+ { .rate = 90,
+ .val = ZD_OFDM_RATE_9M,
+ .flags = IEEE80211_RATE_OFDM },
+ { .rate = 120,
+ .val = ZD_OFDM_RATE_12M,
+ .flags = IEEE80211_RATE_OFDM },
+ { .rate = 180,
+ .val = ZD_OFDM_RATE_18M,
+ .flags = IEEE80211_RATE_OFDM },
+ { .rate = 240,
+ .val = ZD_OFDM_RATE_24M,
+ .flags = IEEE80211_RATE_OFDM },
+ { .rate = 360,
+ .val = ZD_OFDM_RATE_36M,
+ .flags = IEEE80211_RATE_OFDM },
+ { .rate = 480,
+ .val = ZD_OFDM_RATE_48M,
+ .flags = IEEE80211_RATE_OFDM },
+ { .rate = 540,
+ .val = ZD_OFDM_RATE_54M,
+ .flags = IEEE80211_RATE_OFDM },
+};
+
+static const struct ieee80211_channel zd_channels[] = {
+ { .chan = 1,
+ .freq = 2412},
+ { .chan = 2,
+ .freq = 2417},
+ { .chan = 3,
+ .freq = 2422},
+ { .chan = 4,
+ .freq = 2427},
+ { .chan = 5,
+ .freq = 2432},
+ { .chan = 6,
+ .freq = 2437},
+ { .chan = 7,
+ .freq = 2442},
+ { .chan = 8,
+ .freq = 2447},
+ { .chan = 9,
+ .freq = 2452},
+ { .chan = 10,
+ .freq = 2457},
+ { .chan = 11,
+ .freq = 2462},
+ { .chan = 12,
+ .freq = 2467},
+ { .chan = 13,
+ .freq = 2472},
+ { .chan = 14,
+ .freq = 2484}
+};
+
+static void housekeeping_init(struct zd_mac *mac);
+static void housekeeping_enable(struct zd_mac *mac);
+static void housekeeping_disable(struct zd_mac *mac);
+
+int zd_mac_preinit_hw(struct ieee80211_hw *hw)
+{
+ int r;
+ u8 addr[ETH_ALEN];
+ struct zd_mac *mac = zd_hw_mac(hw);
+
+ r = zd_chip_read_mac_addr_fw(&mac->chip, addr);
+ if (r)
+ return r;
+
+ SET_IEEE80211_PERM_ADDR(hw, addr);
+
+ return 0;
+}
+
+int zd_mac_init_hw(struct ieee80211_hw *hw)
+{
+ int r;
+ struct zd_mac *mac = zd_hw_mac(hw);
+ struct zd_chip *chip = &mac->chip;
+ u8 default_regdomain;
+
+ r = zd_chip_enable_int(chip);
+ if (r)
+ goto out;
+ r = zd_chip_init_hw(chip);
+ if (r)
+ goto disable_int;
+
+ ZD_ASSERT(!irqs_disabled());
+
+ r = zd_read_regdomain(chip, &default_regdomain);
+ if (r)
+ goto disable_int;
+ spin_lock_irq(&mac->lock);
+ mac->regdomain = mac->default_regdomain = default_regdomain;
+ spin_unlock_irq(&mac->lock);
+
+ /* 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;
+
+ zd_geo_init(hw, mac->regdomain);
+
+ r = 0;
+disable_int:
+ zd_chip_disable_int(chip);
+out:
+ return r;
+}
+
+void zd_mac_clear(struct zd_mac *mac)
+{
+ flush_workqueue(zd_workqueue);
+ zd_chip_clear(&mac->chip);
+ ZD_ASSERT(!spin_is_locked(&mac->lock));
+ ZD_MEMCLEAR(mac, sizeof(struct zd_mac));
+}
+
+static int set_rx_filter(struct zd_mac *mac)
+{
+ unsigned long flags;
+ u32 filter = STA_RX_FILTER;
+
+ spin_lock_irqsave(&mac->lock, flags);
+ if (mac->pass_ctrl)
+ filter |= RX_FILTER_CTRL;
+ spin_unlock_irqrestore(&mac->lock, flags);
+
+ return zd_iowrite32(&mac->chip, CR_RX_FILTER, filter);
+}
+
+static int set_mc_hash(struct zd_mac *mac)
+{
+ struct zd_mc_hash hash;
+ zd_mc_clear(&hash);
+ return zd_chip_set_multicast_hash(&mac->chip, &hash);
+}
+
+static int zd_op_start(struct ieee80211_hw *hw)
+{
+ struct zd_mac *mac = zd_hw_mac(hw);
+ struct zd_chip *chip = &mac->chip;
+ struct zd_usb *usb = &chip->usb;
+ int r;
+
+ if (!usb->initialized) {
+ r = zd_usb_init_hw(usb);
+ if (r)
+ goto out;
+ }
+
+ 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 = set_rx_filter(mac);
+ if (r)
+ goto disable_int;
+ r = set_mc_hash(mac);
+ if (r)
+ goto disable_int;
+ r = zd_chip_switch_radio_on(chip);
+ if (r < 0)
+ goto disable_int;
+ r = zd_chip_enable_rxtx(chip);
+ if (r < 0)
+ goto disable_radio;
+ r = zd_chip_enable_hwint(chip);
+ if (r < 0)
+ goto disable_rxtx;
+
+ housekeeping_enable(mac);
+ return 0;
+disable_rxtx:
+ zd_chip_disable_rxtx(chip);
+disable_radio:
+ zd_chip_switch_radio_off(chip);
+disable_int:
+ zd_chip_disable_int(chip);
+out:
+ return r;
+}
+
+/**
+ * clear_tx_skb_control_block - clears the control block of tx skbuffs
+ * @skb: a &struct sk_buff pointer
+ *
+ * This clears the control block of skbuff buffers, which were transmitted to
+ * the device. Notify that the function is not thread-safe, so prevent
+ * multiple calls.
+ */
+static void clear_tx_skb_control_block(struct sk_buff *skb)
+{
+ struct zd_tx_skb_control_block *cb =
+ (struct zd_tx_skb_control_block *)skb->cb;
+
+ kfree(cb->control);
+ cb->control = NULL;
+}
+
+/**
+ * kfree_tx_skb - frees a tx skbuff
+ * @skb: a &struct sk_buff pointer
+ *
+ * Frees the tx skbuff. Frees also the allocated control structure in the
+ * control block if necessary.
+ */
+static void kfree_tx_skb(struct sk_buff *skb)
+{
+ clear_tx_skb_control_block(skb);
+ dev_kfree_skb_any(skb);
+}
+
+static void zd_op_stop(struct ieee80211_hw *hw)
+{
+ struct zd_mac *mac = zd_hw_mac(hw);
+ struct zd_chip *chip = &mac->chip;
+ struct sk_buff *skb;
+ struct sk_buff_head *ack_wait_queue = &mac->ack_wait_queue;
+
+ /* 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 mac80211 after we have stopped it.
+ */
+
+ zd_chip_disable_rxtx(chip);
+ housekeeping_disable(mac);
+ flush_workqueue(zd_workqueue);
+
+ zd_chip_disable_hwint(chip);
+ zd_chip_switch_radio_off(chip);
+ zd_chip_disable_int(chip);
+
+
+ while ((skb = skb_dequeue(ack_wait_queue)))
+ kfree_tx_skb(skb);
+}
+
+/**
+ * init_tx_skb_control_block - initializes skb control block
+ * @skb: a &sk_buff pointer
+ * @dev: pointer to the mac80221 device
+ * @control: mac80211 tx control applying for the frame in @skb
+ *
+ * Initializes the control block of the skbuff to be transmitted.
+ */
+static int init_tx_skb_control_block(struct sk_buff *skb,
+ struct ieee80211_hw *hw,
+ struct ieee80211_tx_control *control)
+{
+ struct zd_tx_skb_control_block *cb =
+ (struct zd_tx_skb_control_block *)skb->cb;
+
+ ZD_ASSERT(sizeof(*cb) <= sizeof(skb->cb));
+ memset(cb, 0, sizeof(*cb));
+ cb->hw= hw;
+ cb->control = kmalloc(sizeof(*control), GFP_ATOMIC);
+ if (cb->control == NULL)
+ return -ENOMEM;
+ memcpy(cb->control, control, sizeof(*control));
+
+ return 0;
+}
+
+/**
+ * tx_status - reports tx status of a packet if required
+ * @hw - a &struct ieee80211_hw pointer
+ * @skb - a sk-buffer
+ * @status - the tx status of the packet without control information
+ * @success - True for successfull transmission of the frame
+ *
+ * This information calls ieee80211_tx_status_irqsafe() if required by the
+ * control information. It copies the control information into the status
+ * information.
+ *
+ * If no status information has been requested, the skb is freed.
+ */
+static void tx_status(struct ieee80211_hw *hw, struct sk_buff *skb,
+ struct ieee80211_tx_status *status,
+ bool success)
+{
+ struct zd_tx_skb_control_block *cb = (struct zd_tx_skb_control_block *)
+ skb->cb;
+
+ ZD_ASSERT(cb->control != NULL);
+ memcpy(&status->control, cb->control, sizeof(status->control));
+ if (!success)
+ status->excessive_retries = 1;
+ clear_tx_skb_control_block(skb);
+ ieee80211_tx_status_irqsafe(hw, skb, status);
+}
+
+/**
+ * zd_mac_tx_failed - callback for failed frames
+ * @dev: the mac80211 wireless device
+ *
+ * This function is called if a frame couldn't be succesfully be
+ * transferred. The first frame from the tx queue, will be selected and
+ * reported as error to the upper layers.
+ */
+void zd_mac_tx_failed(struct ieee80211_hw *hw)
+{
+ struct sk_buff_head *q = &zd_hw_mac(hw)->ack_wait_queue;
+ struct sk_buff *skb;
+ struct ieee80211_tx_status status;
+
+ skb = skb_dequeue(q);
+ if (skb == NULL)
+ return;
+
+ memset(&status, 0, sizeof(status));
+
+ tx_status(hw, skb, &status, 0);
+}
+
+/**
+ * zd_mac_tx_to_dev - callback for USB layer
+ * @skb: a &sk_buff pointer
+ * @error: error value, 0 if transmission successful
+ *
+ * Informs the MAC layer that the frame has successfully transferred to the
+ * device. If an ACK is required and the transfer to the device has been
+ * successful, the packets are put on the @ack_wait_queue with
+ * the control set removed.
+ */
+void zd_mac_tx_to_dev(struct sk_buff *skb, int error)
+{
+ struct zd_tx_skb_control_block *cb =
+ (struct zd_tx_skb_control_block *)skb->cb;
+ struct ieee80211_hw *hw = cb->hw;
+
+ if (likely(cb->control)) {
+ skb_pull(skb, sizeof(struct zd_ctrlset));
+ if (unlikely(error ||
+ (cb->control->flags & IEEE80211_TXCTL_NO_ACK)))
+ {
+ struct ieee80211_tx_status status;
+ memset(&status, 0, sizeof(status));
+ tx_status(hw, skb, &status, !error);
+ } else {
+ struct sk_buff_head *q =
+ &zd_hw_mac(hw)->ack_wait_queue;
+
+ skb_queue_tail(q, skb);
+ while (skb_queue_len(q) > ZD_MAC_MAX_ACK_WAITERS)
+ zd_mac_tx_failed(hw);
+ }
+ } else {
+ kfree_tx_skb(skb);
+ }
+}
+
+static int zd_calc_tx_length_us(u8 *service, u8 zd_rate, u16 tx_length)
+{
+ /* ZD_PURE_RATE() must be used to remove the modulation type flag of
+ * the zd-rate values.
+ */
+ static const u8 rate_divisor[] = {
+ [ZD_PURE_RATE(ZD_CCK_RATE_1M)] = 1,
+ [ZD_PURE_RATE(ZD_CCK_RATE_2M)] = 2,
+ /* Bits must be doubled. */
+ [ZD_PURE_RATE(ZD_CCK_RATE_5_5M)] = 11,
+ [ZD_PURE_RATE(ZD_CCK_RATE_11M)] = 11,
+ [ZD_PURE_RATE(ZD_OFDM_RATE_6M)] = 6,
+ [ZD_PURE_RATE(ZD_OFDM_RATE_9M)] = 9,
+ [ZD_PURE_RATE(ZD_OFDM_RATE_12M)] = 12,
+ [ZD_PURE_RATE(ZD_OFDM_RATE_18M)] = 18,
+ [ZD_PURE_RATE(ZD_OFDM_RATE_24M)] = 24,
+ [ZD_PURE_RATE(ZD_OFDM_RATE_36M)] = 36,
+ [ZD_PURE_RATE(ZD_OFDM_RATE_48M)] = 48,
+ [ZD_PURE_RATE(ZD_OFDM_RATE_54M)] = 54,
+ };
+
+ u32 bits = (u32)tx_length * 8;
+ u32 divisor;
+
+ divisor = rate_divisor[ZD_PURE_RATE(zd_rate)];
+ if (divisor == 0)
+ return -EINVAL;
+
+ switch (zd_rate) {
+ case ZD_CCK_RATE_5_5M:
+ bits = (2*bits) + 10; /* round up to the next integer */
+ break;
+ case ZD_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;
+}
+
+static void cs_set_control(struct zd_mac *mac, struct zd_ctrlset *cs,
+ struct ieee80211_hdr *header, u32 flags)
+{
+ u16 fctl = le16_to_cpu(header->frame_control);
+
+ /*
+ * CONTROL TODO:
+ * - if backoff needed, enable bit 0
+ * - if burst (backoff not needed) disable bit 0
+ */
+
+ cs->control = 0;
+
+ /* First fragment */
+ if (flags & IEEE80211_TXCTL_FIRST_FRAGMENT)
+ cs->control |= ZD_CS_NEED_RANDOM_BACKOFF;
+
+ /* Multicast */
+ if (is_multicast_ether_addr(header->addr1))
+ cs->control |= ZD_CS_MULTICAST;
+
+ /* PS-POLL */
+ if ((fctl & (IEEE80211_FCTL_FTYPE|IEEE80211_FCTL_STYPE)) ==
+ (IEEE80211_FTYPE_CTL|IEEE80211_STYPE_PSPOLL))
+ cs->control |= ZD_CS_PS_POLL_FRAME;
+
+ if (flags & IEEE80211_TXCTL_USE_RTS_CTS)
+ cs->control |= ZD_CS_RTS;
+
+ if (flags & IEEE80211_TXCTL_USE_CTS_PROTECT)
+ cs->control |= ZD_CS_SELF_CTS;
+
+ /* FIXME: Management frame? */
+}
+
+static int fill_ctrlset(struct zd_mac *mac,
+ struct sk_buff *skb,
+ struct ieee80211_tx_control *control)
+{
+ int r;
+ struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
+ unsigned int frag_len = skb->len + FCS_LEN;
+ unsigned int packet_length;
+ struct zd_ctrlset *cs = (struct zd_ctrlset *)
+ skb_push(skb, sizeof(struct zd_ctrlset));
+
+ ZD_ASSERT(frag_len <= 0xffff);
+
+ cs->modulation = control->tx_rate;
+
+ cs->tx_length = cpu_to_le16(frag_len);
+
+ cs_set_control(mac, cs, hdr, control->flags);
+
+ 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(zd_chip_is_zd1211b(&mac->chip) ?
+ 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_RATE(cs->modulation),
+ le16_to_cpu(cs->tx_length));
+ if (r < 0)
+ return r;
+ cs->current_length = cpu_to_le16(r);
+ cs->next_frame_length = 0;
+
+ return 0;
+}
+
+/**
+ * zd_op_tx - transmits a network frame to the device
+ *
+ * @dev: mac80211 hardware device
+ * @skb: socket buffer
+ * @control: the control structure
+ *
+ * This function transmit an IEEE 802.11 network frame to the device. The
+ * control block of the skbuff will be initialized. If necessary the incoming
+ * mac80211 queues will be stopped.
+ */
+static int zd_op_tx(struct ieee80211_hw *hw, struct sk_buff *skb,
+ struct ieee80211_tx_control *control)
+{
+ struct zd_mac *mac = zd_hw_mac(hw);
+ int r;
+
+ r = fill_ctrlset(mac, skb, control);
+ if (r)
+ return r;
+
+ r = init_tx_skb_control_block(skb, hw, control);
+ if (r)
+ return r;
+ r = zd_usb_tx(&mac->chip.usb, skb);
+ if (r) {
+ clear_tx_skb_control_block(skb);
+ return r;
+ }
+ return 0;
+}
+
+/**
+ * filter_ack - filters incoming packets for acknowledgements
+ * @dev: the mac80211 device
+ * @rx_hdr: received header
+ * @stats: the status for the received packet
+ *
+ * This functions looks for ACK packets and tries to match them with the
+ * frames in the tx queue. If a match is found the frame will be dequeued and
+ * the upper layers is informed about the successful transmission. If
+ * mac80211 queues have been stopped and the number of frames still to be
+ * transmitted is low the queues will be opened again.
+ *
+ * Returns 1 if the frame was an ACK, 0 if it was ignored.
+ */
+static int filter_ack(struct ieee80211_hw *hw, struct ieee80211_hdr *rx_hdr,
+ struct ieee80211_rx_status *stats)
+{
+ u16 fc = le16_to_cpu(rx_hdr->frame_control);
+ struct sk_buff *skb;
+ struct sk_buff_head *q;
+ unsigned long flags;
+
+ if ((fc & (IEEE80211_FCTL_FTYPE | IEEE80211_FCTL_STYPE)) !=
+ (IEEE80211_FTYPE_CTL | IEEE80211_STYPE_ACK))
+ return 0;
+
+ q = &zd_hw_mac(hw)->ack_wait_queue;
+ spin_lock_irqsave(&q->lock, flags);
+ for (skb = q->next; skb != (struct sk_buff *)q; skb = skb->next) {
+ struct ieee80211_hdr *tx_hdr;
+
+ tx_hdr = (struct ieee80211_hdr *)skb->data;
+ if (likely(!compare_ether_addr(tx_hdr->addr2, rx_hdr->addr1)))
+ {
+ struct ieee80211_tx_status status;
+
+ memset(&status, 0, sizeof(status));
+ status.flags = IEEE80211_TX_STATUS_ACK;
+ status.ack_signal = stats->ssi;
+ __skb_unlink(skb, q);
+ tx_status(hw, skb, &status, 1);
+ goto out;
+ }
+ }
+out:
+ spin_unlock_irqrestore(&q->lock, flags);
+ return 1;
+}
+
+int zd_mac_rx(struct ieee80211_hw *hw, const u8 *buffer, unsigned int length)
+{
+ struct zd_mac *mac = zd_hw_mac(hw);
+ struct ieee80211_rx_status stats;
+ const struct rx_status *status;
+ struct sk_buff *skb;
+ int bad_frame = 0;
+ u16 fc;
+ bool is_qos, is_4addr, need_padding;
+
+ if (length < ZD_PLCP_HEADER_SIZE + 10 /* IEEE80211_1ADDR_LEN */ +
+ FCS_LEN + sizeof(struct rx_status))
+ return -EINVAL;
+
+ memset(&stats, 0, sizeof(stats));
+
+ /* Note about pass_failed_fcs and pass_ctrl access below:
+ * mac locking intentionally omitted here, as this is the only unlocked
+ * reader and the only writer is configure_filter. Plus, if there were
+ * any races accessing these variables, it wouldn't really matter.
+ * If mac80211 ever provides a way for us to access filter flags
+ * from outside configure_filter, we could improve on this. Also, this
+ * situation may change once we implement some kind of DMA-into-skb
+ * RX path. */
+
+ /* Caller has to ensure that length >= sizeof(struct rx_status). */
+ status = (struct rx_status *)
+ (buffer + (length - sizeof(struct rx_status)));
+ if (status->frame_status & ZD_RX_ERROR) {
+ if (mac->pass_failed_fcs &&
+ (status->frame_status & ZD_RX_CRC32_ERROR)) {
+ stats.flag |= RX_FLAG_FAILED_FCS_CRC;
+ bad_frame = 1;
+ } else {
+ return -EINVAL;
+ }
+ }
+
+ stats.channel = _zd_chip_get_channel(&mac->chip);
+ stats.freq = zd_channels[stats.channel - 1].freq;
+ stats.phymode = MODE_IEEE80211G;
+ stats.ssi = status->signal_strength;
+ stats.signal = zd_rx_qual_percent(buffer,
+ length - sizeof(struct rx_status),
+ status);
+ stats.rate = zd_rx_rate(buffer, status);
+
+ length -= ZD_PLCP_HEADER_SIZE + sizeof(struct rx_status);
+ buffer += ZD_PLCP_HEADER_SIZE;
+
+ /* Except for bad frames, filter each frame to see if it is an ACK, in
+ * which case our internal TX tracking is updated. Normally we then
+ * bail here as there's no need to pass ACKs on up to the stack, but
+ * there is also the case where the stack has requested us to pass
+ * control frames on up (pass_ctrl) which we must consider. */
+ if (!bad_frame &&
+ filter_ack(hw, (struct ieee80211_hdr *)buffer, &stats)
+ && !mac->pass_ctrl)
+ return 0;
+
+ fc = le16_to_cpu(*((__le16 *) buffer));
+
+ is_qos = ((fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA) &&
+ ((fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_QOS_DATA);
+ is_4addr = (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
+ (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS);
+ need_padding = is_qos ^ is_4addr;
+
+ skb = dev_alloc_skb(length + (need_padding ? 2 : 0));
+ if (skb == NULL)
+ return -ENOMEM;
+ if (need_padding) {
+ /* Make sure the the payload data is 4 byte aligned. */
+ skb_reserve(skb, 2);
+ }
+
+ memcpy(skb_put(skb, length), buffer, length);
+
+ ieee80211_rx_irqsafe(hw, skb, &stats);
+ return 0;
+}
+
+static int zd_op_add_interface(struct ieee80211_hw *hw,
+ struct ieee80211_if_init_conf *conf)
+{
+ struct zd_mac *mac = zd_hw_mac(hw);
+
+ /* using IEEE80211_IF_TYPE_INVALID to indicate no mode selected */
+ if (mac->type != IEEE80211_IF_TYPE_INVALID)
+ return -EOPNOTSUPP;
+
+ switch (conf->type) {
+ case IEEE80211_IF_TYPE_MNTR:
+ case IEEE80211_IF_TYPE_STA:
+ mac->type = conf->type;
+ break;
+ default:
+ return -EOPNOTSUPP;
+ }
+
+ return zd_write_mac_addr(&mac->chip, conf->mac_addr);
+}
+
+static void zd_op_remove_interface(struct ieee80211_hw *hw,
+ struct ieee80211_if_init_conf *conf)
+{
+ struct zd_mac *mac = zd_hw_mac(hw);
+ mac->type = IEEE80211_IF_TYPE_INVALID;
+ zd_write_mac_addr(&mac->chip, NULL);
+}
+
+static int zd_op_config(struct ieee80211_hw *hw, struct ieee80211_conf *conf)
+{
+ struct zd_mac *mac = zd_hw_mac(hw);
+ return zd_chip_set_channel(&mac->chip, conf->channel);
+}
+
+static int zd_op_config_interface(struct ieee80211_hw *hw,
+ struct ieee80211_vif *vif,
+ struct ieee80211_if_conf *conf)
+{
+ struct zd_mac *mac = zd_hw_mac(hw);
+
+ spin_lock_irq(&mac->lock);
+ mac->associated = is_valid_ether_addr(conf->bssid);
+ spin_unlock_irq(&mac->lock);
+
+ /* TODO: do hardware bssid filtering */
+ return 0;
+}
+
+static void set_multicast_hash_handler(struct work_struct *work)
+{
+ struct zd_mac *mac =
+ container_of(work, struct zd_mac, set_multicast_hash_work);
+ struct zd_mc_hash hash;
+
+ spin_lock_irq(&mac->lock);
+ hash = mac->multicast_hash;
+ spin_unlock_irq(&mac->lock);
+
+ zd_chip_set_multicast_hash(&mac->chip, &hash);
+}
+
+static void set_rx_filter_handler(struct work_struct *work)
+{
+ struct zd_mac *mac =
+ container_of(work, struct zd_mac, set_rx_filter_work);
+ int r;
+
+ dev_dbg_f(zd_mac_dev(mac), "\n");
+ r = set_rx_filter(mac);
+ if (r)
+ dev_err(zd_mac_dev(mac), "set_rx_filter_handler error %d\n", r);
+}
+
+#define SUPPORTED_FIF_FLAGS \
+ (FIF_PROMISC_IN_BSS | FIF_ALLMULTI | FIF_FCSFAIL | FIF_CONTROL | \
+ FIF_OTHER_BSS)
+static void zd_op_configure_filter(struct ieee80211_hw *hw,
+ unsigned int changed_flags,
+ unsigned int *new_flags,
+ int mc_count, struct dev_mc_list *mclist)
+{
+ struct zd_mc_hash hash;
+ struct zd_mac *mac = zd_hw_mac(hw);
+ unsigned long flags;
+ int i;
+
+ /* Only deal with supported flags */
+ changed_flags &= SUPPORTED_FIF_FLAGS;
+ *new_flags &= SUPPORTED_FIF_FLAGS;
+
+ /* changed_flags is always populated but this driver
+ * doesn't support all FIF flags so its possible we don't
+ * need to do anything */
+ if (!changed_flags)
+ return;
+
+ if (*new_flags & (FIF_PROMISC_IN_BSS | FIF_ALLMULTI)) {
+ zd_mc_add_all(&hash);
+ } else {
+ DECLARE_MAC_BUF(macbuf);
+
+ zd_mc_clear(&hash);
+ for (i = 0; i < mc_count; i++) {
+ if (!mclist)
+ break;
+ dev_dbg_f(zd_mac_dev(mac), "mc addr %s\n",
+ print_mac(macbuf, mclist->dmi_addr));
+ zd_mc_add_addr(&hash, mclist->dmi_addr);
+ mclist = mclist->next;
+ }
+ }
+
+ spin_lock_irqsave(&mac->lock, flags);
+ mac->pass_failed_fcs = !!(*new_flags & FIF_FCSFAIL);
+ mac->pass_ctrl = !!(*new_flags & FIF_CONTROL);
+ mac->multicast_hash = hash;
+ spin_unlock_irqrestore(&mac->lock, flags);
+ queue_work(zd_workqueue, &mac->set_multicast_hash_work);
+
+ if (changed_flags & FIF_CONTROL)
+ queue_work(zd_workqueue, &mac->set_rx_filter_work);
+
+ /* no handling required for FIF_OTHER_BSS as we don't currently
+ * do BSSID filtering */
+ /* FIXME: in future it would be nice to enable the probe response
+ * filter (so that the driver doesn't see them) until
+ * FIF_BCN_PRBRESP_PROMISC is set. however due to atomicity here, we'd
+ * have to schedule work to enable prbresp reception, which might
+ * happen too late. For now we'll just listen and forward them all the
+ * time. */
+}
+
+static void set_rts_cts_work(struct work_struct *work)
+{
+ struct zd_mac *mac =
+ container_of(work, struct zd_mac, set_rts_cts_work);
+ unsigned long flags;
+ unsigned int short_preamble;
+
+ mutex_lock(&mac->chip.mutex);
+
+ spin_lock_irqsave(&mac->lock, flags);
+ mac->updating_rts_rate = 0;
+ short_preamble = mac->short_preamble;
+ spin_unlock_irqrestore(&mac->lock, flags);
+
+ zd_chip_set_rts_cts_rate_locked(&mac->chip, short_preamble);
+ mutex_unlock(&mac->chip.mutex);
+}
+
+static void zd_op_bss_info_changed(struct ieee80211_hw *hw,
+ struct ieee80211_vif *vif,
+ struct ieee80211_bss_conf *bss_conf,
+ u32 changes)
+{
+ struct zd_mac *mac = zd_hw_mac(hw);
+ unsigned long flags;
+
+ dev_dbg_f(zd_mac_dev(mac), "changes: %x\n", changes);
+
+ if (changes & BSS_CHANGED_ERP_PREAMBLE) {
+ spin_lock_irqsave(&mac->lock, flags);
+ mac->short_preamble = bss_conf->use_short_preamble;
+ if (!mac->updating_rts_rate) {
+ mac->updating_rts_rate = 1;
+ /* FIXME: should disable TX here, until work has
+ * completed and RTS_CTS reg is updated */
+ queue_work(zd_workqueue, &mac->set_rts_cts_work);
+ }
+ spin_unlock_irqrestore(&mac->lock, flags);
+ }
+}
+
+static const struct ieee80211_ops zd_ops = {
+ .tx = zd_op_tx,
+ .start = zd_op_start,
+ .stop = zd_op_stop,
+ .add_interface = zd_op_add_interface,
+ .remove_interface = zd_op_remove_interface,
+ .config = zd_op_config,
+ .config_interface = zd_op_config_interface,
+ .configure_filter = zd_op_configure_filter,
+ .bss_info_changed = zd_op_bss_info_changed,
+};
+
+struct ieee80211_hw *zd_mac_alloc_hw(struct usb_interface *intf)
+{
+ struct zd_mac *mac;
+ struct ieee80211_hw *hw;
+ int i;
+
+ hw = ieee80211_alloc_hw(sizeof(struct zd_mac), &zd_ops);
+ if (!hw) {
+ dev_dbg_f(&intf->dev, "out of memory\n");
+ return NULL;
+ }
+
+ mac = zd_hw_mac(hw);
+
+ memset(mac, 0, sizeof(*mac));
+ spin_lock_init(&mac->lock);
+ mac->hw = hw;
+
+ mac->type = IEEE80211_IF_TYPE_INVALID;
+
+ memcpy(mac->channels, zd_channels, sizeof(zd_channels));
+ memcpy(mac->rates, zd_rates, sizeof(zd_rates));
+ mac->modes[0].mode = MODE_IEEE80211G;
+ mac->modes[0].num_rates = ARRAY_SIZE(zd_rates);
+ mac->modes[0].rates = mac->rates;
+ mac->modes[0].num_channels = ARRAY_SIZE(zd_channels);
+ mac->modes[0].channels = mac->channels;
+ mac->modes[1].mode = MODE_IEEE80211B;
+ mac->modes[1].num_rates = 4;
+ mac->modes[1].rates = mac->rates;
+ mac->modes[1].num_channels = ARRAY_SIZE(zd_channels);
+ mac->modes[1].channels = mac->channels;
+
+ hw->flags = IEEE80211_HW_RX_INCLUDES_FCS |
+ IEEE80211_HW_DEFAULT_REG_DOMAIN_CONFIGURED;
+ hw->max_rssi = 100;
+ hw->max_signal = 100;
+
+ hw->queues = 1;
+ hw->extra_tx_headroom = sizeof(struct zd_ctrlset);
+
+ skb_queue_head_init(&mac->ack_wait_queue);
+
+ for (i = 0; i < 2; i++) {
+ if (ieee80211_register_hwmode(hw, &mac->modes[i])) {
+ dev_dbg_f(&intf->dev, "cannot register hwmode\n");
+ ieee80211_free_hw(hw);
+ return NULL;
+ }
+ }
+
+ zd_chip_init(&mac->chip, hw, intf);
+ housekeeping_init(mac);
+ INIT_WORK(&mac->set_multicast_hash_work, set_multicast_hash_handler);
+ INIT_WORK(&mac->set_rts_cts_work, set_rts_cts_work);
+ INIT_WORK(&mac->set_rx_filter_work, set_rx_filter_handler);
+
+ SET_IEEE80211_DEV(hw, &intf->dev);
+ return hw;
+}
+
+#define LINK_LED_WORK_DELAY HZ
+
+static void link_led_handler(struct work_struct *work)
+{
+ struct zd_mac *mac =
+ container_of(work, struct zd_mac, housekeeping.link_led_work.work);
+ struct zd_chip *chip = &mac->chip;
+ int is_associated;
+ int r;
+
+ spin_lock_irq(&mac->lock);
+ is_associated = mac->associated;
+ spin_unlock_irq(&mac->lock);
+
+ r = zd_chip_control_leds(chip,
+ is_associated ? LED_ASSOCIATED : LED_SCANNING);
+ if (r)
+ dev_dbg_f(zd_mac_dev(mac), "zd_chip_control_leds error %d\n", r);
+
+ queue_delayed_work(zd_workqueue, &mac->housekeeping.link_led_work,
+ LINK_LED_WORK_DELAY);
+}
+
+static void housekeeping_init(struct zd_mac *mac)
+{
+ INIT_DELAYED_WORK(&mac->housekeeping.link_led_work, link_led_handler);
+}
+
+static void housekeeping_enable(struct zd_mac *mac)
+{
+ dev_dbg_f(zd_mac_dev(mac), "\n");
+ queue_delayed_work(zd_workqueue, &mac->housekeeping.link_led_work,
+ 0);
+}
+
+static void housekeeping_disable(struct zd_mac *mac)
+{
+ dev_dbg_f(zd_mac_dev(mac), "\n");
+ cancel_rearming_delayed_workqueue(zd_workqueue,
+ &mac->housekeeping.link_led_work);
+ zd_chip_control_leds(&mac->chip, LED_OFF);
+}