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@@ -1615,6 +1615,10 @@ struct iwl4965_link_quality_cmd {
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/*
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* REPLY_BT_CONFIG = 0x9b (command, has simple generic response)
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+ *
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+ * 3945 and 4965 support hardware handshake with Bluetooth device on
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+ * same platform. Bluetooth device alerts wireless device when it will Tx;
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+ * wireless device can delay or kill its own Tx to accomodate.
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*/
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struct iwl4965_bt_cmd {
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u8 flags;
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@@ -1857,20 +1861,47 @@ struct iwl4965_ct_kill_config {
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*
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*****************************************************************************/
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+/**
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+ * struct iwl4965_scan_channel - entry in REPLY_SCAN_CMD channel table
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+ *
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+ * One for each channel in the scan list.
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+ * Each channel can independently select:
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+ * 1) SSID for directed active scans
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+ * 2) Txpower setting (for rate specified within Tx command)
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+ * 3) How long to stay on-channel (behavior may be modified by quiet_time,
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+ * quiet_plcp_th, good_CRC_th)
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+ *
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+ * To avoid uCode errors, make sure the following are true (see comments
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+ * under struct iwl4965_scan_cmd about max_out_time and quiet_time):
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+ * 1) If using passive_dwell (i.e. passive_dwell != 0):
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+ * active_dwell <= passive_dwell (< max_out_time if max_out_time != 0)
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+ * 2) quiet_time <= active_dwell
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+ * 3) If restricting off-channel time (i.e. max_out_time !=0):
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+ * passive_dwell < max_out_time
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+ * active_dwell < max_out_time
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+ */
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struct iwl4965_scan_channel {
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- /* type is defined as:
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- * 0:0 active (0 - passive)
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- * 1:4 SSID direct
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- * If 1 is set then corresponding SSID IE is transmitted in probe
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+ /*
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+ * type is defined as:
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+ * 0:0 1 = active, 0 = passive
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+ * 1:4 SSID direct bit map; if a bit is set, then corresponding
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+ * SSID IE is transmitted in probe request.
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* 5:7 reserved
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*/
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u8 type;
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- u8 channel;
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+ u8 channel; /* band is selected by iwl4965_scan_cmd "flags" field */
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struct iwl4965_tx_power tpc;
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- __le16 active_dwell;
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- __le16 passive_dwell;
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+ __le16 active_dwell; /* in 1024-uSec TU (time units), typ 5-50 */
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+ __le16 passive_dwell; /* in 1024-uSec TU (time units), typ 20-500 */
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} __attribute__ ((packed));
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+/**
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+ * struct iwl4965_ssid_ie - directed scan network information element
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+ *
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+ * Up to 4 of these may appear in REPLY_SCAN_CMD, selected by "type" field
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+ * in struct iwl4965_scan_channel; each channel may select different ssids from
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+ * among the 4 entries. SSID IEs get transmitted in reverse order of entry.
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+ */
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struct iwl4965_ssid_ie {
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u8 id;
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u8 len;
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@@ -1884,40 +1915,98 @@ struct iwl4965_ssid_ie {
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/*
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* REPLY_SCAN_CMD = 0x80 (command)
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+ *
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+ * The hardware scan command is very powerful; the driver can set it up to
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+ * maintain (relatively) normal network traffic while doing a scan in the
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+ * background. The max_out_time and suspend_time control the ratio of how
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+ * long the device stays on an associated network channel ("service channel")
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+ * vs. how long it's away from the service channel, i.e. tuned to other channels
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+ * for scanning.
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+ *
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+ * max_out_time is the max time off-channel (in usec), and suspend_time
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+ * is how long (in "extended beacon" format) that the scan is "suspended"
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+ * after returning to the service channel. That is, suspend_time is the
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+ * time that we stay on the service channel, doing normal work, between
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+ * scan segments. The driver may set these parameters differently to support
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+ * scanning when associated vs. not associated, and light vs. heavy traffic
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+ * loads when associated.
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+ *
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+ * After receiving this command, the device's scan engine does the following;
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+ *
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+ * 1) Sends SCAN_START notification to driver
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+ * 2) Checks to see if it has time to do scan for one channel
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+ * 3) Sends NULL packet, with power-save (PS) bit set to 1,
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+ * to tell AP that we're going off-channel
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+ * 4) Tunes to first channel in scan list, does active or passive scan
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+ * 5) Sends SCAN_RESULT notification to driver
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+ * 6) Checks to see if it has time to do scan on *next* channel in list
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+ * 7) Repeats 4-6 until it no longer has time to scan the next channel
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+ * before max_out_time expires
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+ * 8) Returns to service channel
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+ * 9) Sends NULL packet with PS=0 to tell AP that we're back
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+ * 10) Stays on service channel until suspend_time expires
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+ * 11) Repeats entire process 2-10 until list is complete
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+ * 12) Sends SCAN_COMPLETE notification
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+ *
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+ * For fast, efficient scans, the scan command also has support for staying on
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+ * a channel for just a short time, if doing active scanning and getting no
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+ * responses to the transmitted probe request. This time is controlled by
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+ * quiet_time, and the number of received packets below which a channel is
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+ * considered "quiet" is controlled by quiet_plcp_threshold.
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+ *
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+ * For active scanning on channels that have regulatory restrictions against
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+ * blindly transmitting, the scan can listen before transmitting, to make sure
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+ * that there is already legitimate activity on the channel. If enough
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+ * packets are cleanly received on the channel (controlled by good_CRC_th,
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+ * typical value 1), the scan engine starts transmitting probe requests.
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+ *
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+ * Driver must use separate scan commands for 2.4 vs. 5 GHz bands.
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+ *
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+ * To avoid uCode errors, see timing restrictions described under
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+ * struct iwl4965_scan_channel.
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*/
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struct iwl4965_scan_cmd {
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__le16 len;
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u8 reserved0;
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- u8 channel_count;
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- __le16 quiet_time; /* dwell only this long on quiet chnl
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- * (active scan) */
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- __le16 quiet_plcp_th; /* quiet chnl is < this # pkts (typ. 1) */
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- __le16 good_CRC_th; /* passive -> active promotion threshold */
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- __le16 rx_chain;
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- __le32 max_out_time; /* max usec to be out of associated (service)
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- * chnl */
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- __le32 suspend_time; /* pause scan this long when returning to svc
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- * chnl.
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- * 3945 -- 31:24 # beacons, 19:0 additional usec,
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- * 4965 -- 31:22 # beacons, 21:0 additional usec.
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- */
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- __le32 flags;
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- __le32 filter_flags;
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-
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+ u8 channel_count; /* # channels in channel list */
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+ __le16 quiet_time; /* dwell only this # millisecs on quiet channel
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+ * (only for active scan) */
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+ __le16 quiet_plcp_th; /* quiet chnl is < this # pkts (typ. 1) */
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+ __le16 good_CRC_th; /* passive -> active promotion threshold */
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+ __le16 rx_chain; /* RXON_RX_CHAIN_* */
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+ __le32 max_out_time; /* max usec to be away from associated (service)
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+ * channel */
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+ __le32 suspend_time; /* pause scan this long (in "extended beacon
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+ * format") when returning to service chnl:
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+ * 3945; 31:24 # beacons, 19:0 additional usec,
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+ * 4965; 31:22 # beacons, 21:0 additional usec.
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+ */
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+ __le32 flags; /* RXON_FLG_* */
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+ __le32 filter_flags; /* RXON_FILTER_* */
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+
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+ /* For active scans (set to all-0s for passive scans).
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+ * Does not include payload. Must specify Tx rate; no rate scaling. */
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struct iwl4965_tx_cmd tx_cmd;
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+
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+ /* For directed active scans (set to all-0s otherwise) */
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struct iwl4965_ssid_ie direct_scan[PROBE_OPTION_MAX];
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- u8 data[0];
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/*
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- * The channels start after the probe request payload and are of type:
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+ * Probe request frame, followed by channel list.
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+ *
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+ * Size of probe request frame is specified by byte count in tx_cmd.
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+ * Channel list follows immediately after probe request frame.
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+ * Number of channels in list is specified by channel_count.
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+ * Each channel in list is of type:
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*
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* struct iwl4965_scan_channel channels[0];
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*
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* NOTE: Only one band of channels can be scanned per pass. You
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- * can not mix 2.4GHz channels and 5.2GHz channels and must
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- * request a scan multiple times (not concurrently)
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- *
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+ * must not mix 2.4GHz channels and 5.2GHz channels, and you must wait
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+ * for one scan to complete (i.e. receive SCAN_COMPLETE_NOTIFICATION)
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+ * before requesting another scan.
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*/
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+ u8 data[0];
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} __attribute__ ((packed));
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/* Can abort will notify by complete notification with abort status. */
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@@ -2087,7 +2176,7 @@ struct statistics_rx_non_phy {
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__le32 interference_data_flag; /* flag for interference data
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* availability. 1 when data is
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* available. */
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- __le32 channel_load; /* counts RX Enable time */
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+ __le32 channel_load; /* counts RX Enable time in uSec */
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__le32 dsp_false_alarms; /* DSP false alarm (both OFDM
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* and CCK) counter */
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__le32 beacon_rssi_a;
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Ben Cahill