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iwlagn: support off-channel TX 

Add support to iwlagn for off-channel TX. The
microcode API for this is a bit strange in that
it uses a hacked-up scan command, so the scan
code needs to change quite a bit to accomodate
that and be able to send it out.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Johannes Berg 2011-03-10 20:13:26 -08:00 committed by John W. Linville
parent 808118cb41
commit 266af4c745
6 changed files with 238 additions and 51 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

135
drivers/net/wireless/iwlwifi/iwl-agn-lib.c
View File

@ -1115,6 +1115,18 @@ static int iwl_get_channels_for_scan(struct iwl_priv *priv,
return added;
}
static int iwl_fill_offch_tx(struct iwl_priv *priv, void *data, size_t maxlen)
{
struct sk_buff *skb = priv->_agn.offchan_tx_skb;
if (skb->len < maxlen)
maxlen = skb->len;
memcpy(data, skb->data, maxlen);
return maxlen;
}
int iwlagn_request_scan(struct iwl_priv *priv, struct ieee80211_vif *vif)
{
struct iwl_host_cmd cmd = {
@ -1157,17 +1169,25 @@ int iwlagn_request_scan(struct iwl_priv *priv, struct ieee80211_vif *vif)
scan->quiet_plcp_th = IWL_PLCP_QUIET_THRESH;
scan->quiet_time = IWL_ACTIVE_QUIET_TIME;
if (iwl_is_any_associated(priv)) {
if (priv->scan_type != IWL_SCAN_OFFCH_TX &&
iwl_is_any_associated(priv)) {
u16 interval = 0;
u32 extra;
u32 suspend_time = 100;
u32 scan_suspend_time = 100;
IWL_DEBUG_INFO(priv, "Scanning while associated...\n");
if (priv->is_internal_short_scan)
switch (priv->scan_type) {
case IWL_SCAN_OFFCH_TX:
WARN_ON(1);
break;
case IWL_SCAN_RADIO_RESET:
interval = 0;
else
break;
case IWL_SCAN_NORMAL:
interval = vif->bss_conf.beacon_int;
break;
}
scan->suspend_time = 0;
scan->max_out_time = cpu_to_le32(200 * 1024);
@ -1180,29 +1200,41 @@ int iwlagn_request_scan(struct iwl_priv *priv, struct ieee80211_vif *vif)
scan->suspend_time = cpu_to_le32(scan_suspend_time);
IWL_DEBUG_SCAN(priv, "suspend_time 0x%X beacon interval %d\n",
scan_suspend_time, interval);
} else if (priv->scan_type == IWL_SCAN_OFFCH_TX) {
scan->suspend_time = 0;
scan->max_out_time =
cpu_to_le32(1024 * priv->_agn.offchan_tx_timeout);
}
if (priv->is_internal_short_scan) {
switch (priv->scan_type) {
case IWL_SCAN_RADIO_RESET:
IWL_DEBUG_SCAN(priv, "Start internal passive scan.\n");
} else if (priv->scan_request->n_ssids) {
int i, p = 0;
IWL_DEBUG_SCAN(priv, "Kicking off active scan\n");
for (i = 0; i < priv->scan_request->n_ssids; i++) {
/* always does wildcard anyway */
if (!priv->scan_request->ssids[i].ssid_len)
continue;
scan->direct_scan[p].id = WLAN_EID_SSID;
scan->direct_scan[p].len =
priv->scan_request->ssids[i].ssid_len;
memcpy(scan->direct_scan[p].ssid,
priv->scan_request->ssids[i].ssid,
priv->scan_request->ssids[i].ssid_len);
n_probes++;
p++;
}
is_active = true;
} else
IWL_DEBUG_SCAN(priv, "Start passive scan.\n");
break;
case IWL_SCAN_NORMAL:
if (priv->scan_request->n_ssids) {
int i, p = 0;
IWL_DEBUG_SCAN(priv, "Kicking off active scan\n");
for (i = 0; i < priv->scan_request->n_ssids; i++) {
/* always does wildcard anyway */
if (!priv->scan_request->ssids[i].ssid_len)
continue;
scan->direct_scan[p].id = WLAN_EID_SSID;
scan->direct_scan[p].len =
priv->scan_request->ssids[i].ssid_len;
memcpy(scan->direct_scan[p].ssid,
priv->scan_request->ssids[i].ssid,
priv->scan_request->ssids[i].ssid_len);
n_probes++;
p++;
}
is_active = true;
} else
IWL_DEBUG_SCAN(priv, "Start passive scan.\n");
break;
case IWL_SCAN_OFFCH_TX:
IWL_DEBUG_SCAN(priv, "Start offchannel TX scan.\n");
break;
}
scan->tx_cmd.tx_flags = TX_CMD_FLG_SEQ_CTL_MSK;
scan->tx_cmd.sta_id = ctx->bcast_sta_id;
@ -1300,38 +1332,77 @@ int iwlagn_request_scan(struct iwl_priv *priv, struct ieee80211_vif *vif)
rx_chain |= rx_ant << RXON_RX_CHAIN_FORCE_SEL_POS;
rx_chain |= 0x1 << RXON_RX_CHAIN_DRIVER_FORCE_POS;
scan->rx_chain = cpu_to_le16(rx_chain);
if (!priv->is_internal_short_scan) {
switch (priv->scan_type) {
case IWL_SCAN_NORMAL:
cmd_len = iwl_fill_probe_req(priv,
(struct ieee80211_mgmt *)scan->data,
vif->addr,
priv->scan_request->ie,
priv->scan_request->ie_len,
IWL_MAX_SCAN_SIZE - sizeof(*scan));
} else {
break;
case IWL_SCAN_RADIO_RESET:
/* use bcast addr, will not be transmitted but must be valid */
cmd_len = iwl_fill_probe_req(priv,
(struct ieee80211_mgmt *)scan->data,
iwl_bcast_addr, NULL, 0,
IWL_MAX_SCAN_SIZE - sizeof(*scan));
break;
case IWL_SCAN_OFFCH_TX:
cmd_len = iwl_fill_offch_tx(priv, scan->data,
IWL_MAX_SCAN_SIZE
- sizeof(*scan)
- sizeof(struct iwl_scan_channel));
scan->scan_flags |= IWL_SCAN_FLAGS_ACTION_FRAME_TX;
break;
default:
BUG();
}
scan->tx_cmd.len = cpu_to_le16(cmd_len);
scan->filter_flags |= (RXON_FILTER_ACCEPT_GRP_MSK |
RXON_FILTER_BCON_AWARE_MSK);
if (priv->is_internal_short_scan) {
switch (priv->scan_type) {
case IWL_SCAN_RADIO_RESET:
scan->channel_count =
iwl_get_single_channel_for_scan(priv, vif, band,
(void *)&scan->data[le16_to_cpu(
scan->tx_cmd.len)]);
} else {
(void *)&scan->data[cmd_len]);
break;
case IWL_SCAN_NORMAL:
scan->channel_count =
iwl_get_channels_for_scan(priv, vif, band,
is_active, n_probes,
(void *)&scan->data[le16_to_cpu(
scan->tx_cmd.len)]);
(void *)&scan->data[cmd_len]);
break;
case IWL_SCAN_OFFCH_TX: {
struct iwl_scan_channel *scan_ch;
scan->channel_count = 1;
scan_ch = (void *)&scan->data[cmd_len];
scan_ch->type = SCAN_CHANNEL_TYPE_ACTIVE;
scan_ch->channel =
cpu_to_le16(priv->_agn.offchan_tx_chan->hw_value);
scan_ch->active_dwell =
cpu_to_le16(priv->_agn.offchan_tx_timeout);
scan_ch->passive_dwell = 0;
/* Set txpower levels to defaults */
scan_ch->dsp_atten = 110;
/* NOTE: if we were doing 6Mb OFDM for scans we'd use
* power level:
* scan_ch->tx_gain = ((1 << 5) | (2 << 3)) | 3;
*/
if (priv->_agn.offchan_tx_chan->band == IEEE80211_BAND_5GHZ)
scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3;
else
scan_ch->tx_gain = ((1 << 5) | (5 << 3));
}
break;
}
if (scan->channel_count == 0) {
IWL_DEBUG_SCAN(priv, "channel count %d\n", scan->channel_count);
return -EIO;

87
drivers/net/wireless/iwlwifi/iwl-agn.c
View File

@ -2937,6 +2937,91 @@ static void iwl_bg_rx_replenish(struct work_struct *data)
mutex_unlock(&priv->mutex);
}
static int iwl_mac_offchannel_tx(struct ieee80211_hw *hw, struct sk_buff *skb,
struct ieee80211_channel *chan,
enum nl80211_channel_type channel_type,
unsigned int wait)
{
struct iwl_priv *priv = hw->priv;
int ret;
/* Not supported if we don't have PAN */
if (!(priv->valid_contexts & BIT(IWL_RXON_CTX_PAN))) {
ret = -EOPNOTSUPP;
goto free;
}
/* Not supported on pre-P2P firmware */
if (!(priv->contexts[IWL_RXON_CTX_PAN].interface_modes &
BIT(NL80211_IFTYPE_P2P_CLIENT))) {
ret = -EOPNOTSUPP;
goto free;
}
mutex_lock(&priv->mutex);
if (!priv->contexts[IWL_RXON_CTX_PAN].is_active) {
/*
* If the PAN context is free, use the normal
* way of doing remain-on-channel offload + TX.
*/
ret = 1;
goto out;
}
/* TODO: queue up if scanning? */
if (test_bit(STATUS_SCANNING, &priv->status) ||
priv->_agn.offchan_tx_skb) {
ret = -EBUSY;
goto out;
}
/*
* max_scan_ie_len doesn't include the blank SSID or the header,
* so need to add that again here.
*/
if (skb->len > hw->wiphy->max_scan_ie_len + 24 + 2) {
ret = -ENOBUFS;
goto out;
}
priv->_agn.offchan_tx_skb = skb;
priv->_agn.offchan_tx_timeout = wait;
priv->_agn.offchan_tx_chan = chan;
ret = iwl_scan_initiate(priv, priv->contexts[IWL_RXON_CTX_PAN].vif,
IWL_SCAN_OFFCH_TX, chan->band);
if (ret)
priv->_agn.offchan_tx_skb = NULL;
out:
mutex_unlock(&priv->mutex);
free:
if (ret < 0)
kfree_skb(skb);
return ret;
}
static int iwl_mac_offchannel_tx_cancel_wait(struct ieee80211_hw *hw)
{
struct iwl_priv *priv = hw->priv;
int ret;
mutex_lock(&priv->mutex);
if (!priv->_agn.offchan_tx_skb)
return -EINVAL;
priv->_agn.offchan_tx_skb = NULL;
ret = iwl_scan_cancel_timeout(priv, 200);
if (ret)
ret = -EIO;
mutex_unlock(&priv->mutex);
return ret;
}
/*****************************************************************************
*
* mac80211 entry point functions
@ -3815,6 +3900,8 @@ struct ieee80211_ops iwlagn_hw_ops = {
.tx_last_beacon = iwl_mac_tx_last_beacon,
.remain_on_channel = iwl_mac_remain_on_channel,
.cancel_remain_on_channel = iwl_mac_cancel_remain_on_channel,
.offchannel_tx = iwl_mac_offchannel_tx,
.offchannel_tx_cancel_wait = iwl_mac_offchannel_tx_cancel_wait,
};
static void iwl_hw_detect(struct iwl_priv *priv)

8
drivers/net/wireless/iwlwifi/iwl-commands.h
View File

@ -2964,9 +2964,15 @@ struct iwl3945_scan_cmd {
u8 data[0];
} __packed;
enum iwl_scan_flags {
/* BIT(0) currently unused */
IWL_SCAN_FLAGS_ACTION_FRAME_TX = BIT(1),
/* bits 2-7 reserved */
};
struct iwl_scan_cmd {
__le16 len;
u8 reserved0;
u8 scan_flags; /* scan flags: see enum iwl_scan_flags */
u8 channel_count; /* # channels in channel list */
__le16 quiet_time; /* dwell only this # millisecs on quiet channel
* (only for active scan) */

6
drivers/net/wireless/iwlwifi/iwl-core.h
View File

@ -63,6 +63,8 @@
#ifndef __iwl_core_h__
#define __iwl_core_h__
#include "iwl-dev.h"
/************************
* forward declarations *
************************/
@ -551,6 +553,10 @@ u16 iwl_get_passive_dwell_time(struct iwl_priv *priv,
struct ieee80211_vif *vif);
void iwl_setup_scan_deferred_work(struct iwl_priv *priv);
void iwl_cancel_scan_deferred_work(struct iwl_priv *priv);
int __must_check iwl_scan_initiate(struct iwl_priv *priv,
struct ieee80211_vif *vif,
enum iwl_scan_type scan_type,
enum ieee80211_band band);
/* For faster active scanning, scan will move to the next channel if fewer than
* PLCP_QUIET_THRESH packets are heard on this channel within

12
drivers/net/wireless/iwlwifi/iwl-dev.h
View File

@ -1230,6 +1230,12 @@ struct iwl_rxon_context {
} ht;
};
enum iwl_scan_type {
IWL_SCAN_NORMAL,
IWL_SCAN_RADIO_RESET,
IWL_SCAN_OFFCH_TX,
};
struct iwl_priv {
/* ieee device used by generic ieee processing code */
@ -1290,7 +1296,7 @@ struct iwl_priv {
enum ieee80211_band scan_band;
struct cfg80211_scan_request *scan_request;
struct ieee80211_vif *scan_vif;
bool is_internal_short_scan;
enum iwl_scan_type scan_type;
u8 scan_tx_ant[IEEE80211_NUM_BANDS];
u8 mgmt_tx_ant;
@ -1504,6 +1510,10 @@ struct iwl_priv {
struct delayed_work hw_roc_work;
enum nl80211_channel_type hw_roc_chantype;
int hw_roc_duration;
struct sk_buff *offchan_tx_skb;
int offchan_tx_timeout;
struct ieee80211_channel *offchan_tx_chan;
} _agn;
#endif
};

41
drivers/net/wireless/iwlwifi/iwl-scan.c
View File

@ -101,7 +101,7 @@ static void iwl_complete_scan(struct iwl_priv *priv, bool aborted)
ieee80211_scan_completed(priv->hw, aborted);
}
priv->is_internal_short_scan = false;
priv->scan_type = IWL_SCAN_NORMAL;
priv->scan_vif = NULL;
priv->scan_request = NULL;
}
@ -339,10 +339,10 @@ void iwl_init_scan_params(struct iwl_priv *priv)
priv->scan_tx_ant[IEEE80211_BAND_2GHZ] = ant_idx;
}
static int __must_check iwl_scan_initiate(struct iwl_priv *priv,
struct ieee80211_vif *vif,
bool internal,
enum ieee80211_band band)
int __must_check iwl_scan_initiate(struct iwl_priv *priv,
struct ieee80211_vif *vif,
enum iwl_scan_type scan_type,
enum ieee80211_band band)
{
int ret;
@ -370,17 +370,19 @@ static int __must_check iwl_scan_initiate(struct iwl_priv *priv,
}
IWL_DEBUG_SCAN(priv, "Starting %sscan...\n",
internal ? "internal short " : "");
scan_type == IWL_SCAN_NORMAL ? "" :
scan_type == IWL_SCAN_OFFCH_TX ? "offchan TX " :
"internal short ");
set_bit(STATUS_SCANNING, &priv->status);
priv->is_internal_short_scan = internal;
priv->scan_type = scan_type;
priv->scan_start = jiffies;
priv->scan_band = band;
ret = priv->cfg->ops->utils->request_scan(priv, vif);
if (ret) {
clear_bit(STATUS_SCANNING, &priv->status);
priv->is_internal_short_scan = false;
priv->scan_type = IWL_SCAN_NORMAL;
return ret;
}
@ -405,7 +407,7 @@ int iwl_mac_hw_scan(struct ieee80211_hw *hw,
mutex_lock(&priv->mutex);
if (test_bit(STATUS_SCANNING, &priv->status) &&
!priv->is_internal_short_scan) {
priv->scan_type != IWL_SCAN_NORMAL) {
IWL_DEBUG_SCAN(priv, "Scan already in progress.\n");
ret = -EAGAIN;
goto out_unlock;
@ -419,11 +421,11 @@ int iwl_mac_hw_scan(struct ieee80211_hw *hw,
* If an internal scan is in progress, just set
* up the scan_request as per above.
*/
if (priv->is_internal_short_scan) {
if (priv->scan_type != IWL_SCAN_NORMAL) {
IWL_DEBUG_SCAN(priv, "SCAN request during internal scan\n");
ret = 0;
} else
ret = iwl_scan_initiate(priv, vif, false,
ret = iwl_scan_initiate(priv, vif, IWL_SCAN_NORMAL,
req->channels[0]->band);
IWL_DEBUG_MAC80211(priv, "leave\n");
@ -452,7 +454,7 @@ static void iwl_bg_start_internal_scan(struct work_struct *work)
mutex_lock(&priv->mutex);
if (priv->is_internal_short_scan == true) {
if (priv->scan_type == IWL_SCAN_RADIO_RESET) {
IWL_DEBUG_SCAN(priv, "Internal scan already in progress\n");
goto unlock;
}
@ -462,7 +464,7 @@ static void iwl_bg_start_internal_scan(struct work_struct *work)
goto unlock;
}
if (iwl_scan_initiate(priv, NULL, true, priv->band))
if (iwl_scan_initiate(priv, NULL, IWL_SCAN_RADIO_RESET, priv->band))
IWL_DEBUG_SCAN(priv, "failed to start internal short scan\n");
unlock:
mutex_unlock(&priv->mutex);
@ -549,8 +551,7 @@ static void iwl_bg_scan_completed(struct work_struct *work)
container_of(work, struct iwl_priv, scan_completed);
bool aborted;
IWL_DEBUG_SCAN(priv, "Completed %sscan.\n",
priv->is_internal_short_scan ? "internal short " : "");
IWL_DEBUG_SCAN(priv, "Completed scan.\n");
cancel_delayed_work(&priv->scan_check);
@ -565,7 +566,13 @@ static void iwl_bg_scan_completed(struct work_struct *work)
goto out_settings;
}
if (priv->is_internal_short_scan && !aborted) {
if (priv->scan_type == IWL_SCAN_OFFCH_TX && priv->_agn.offchan_tx_skb) {
ieee80211_tx_status_irqsafe(priv->hw,
priv->_agn.offchan_tx_skb);
priv->_agn.offchan_tx_skb = NULL;
}
if (priv->scan_type != IWL_SCAN_NORMAL && !aborted) {
int err;
/* Check if mac80211 requested scan during our internal scan */
@ -573,7 +580,7 @@ static void iwl_bg_scan_completed(struct work_struct *work)
goto out_complete;
/* If so request a new scan */
err = iwl_scan_initiate(priv, priv->scan_vif, false,
err = iwl_scan_initiate(priv, priv->scan_vif, IWL_SCAN_NORMAL,
priv->scan_request->channels[0]->band);
if (err) {
IWL_DEBUG_SCAN(priv,