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iwlwifi: support channel switch offload in driver 

Support channel switch in driver as a separated mac80211 callback
function instead of part of mac_config callback; by moving to this
approach, uCode can have more control of channel switch timing.

Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
This commit is contained in:
Wey-Yi Guy 2010-05-06 08:54:11 -07:00 committed by Reinette Chatre
parent a0ee74cf08
commit 79d0732550
6 changed files with 257 additions and 51 deletions
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52
drivers/net/wireless/iwlwifi/iwl-4965.c
View File

@ -1445,7 +1445,8 @@ static int iwl4965_send_rxon_assoc(struct iwl_priv *priv)
return ret;
}
static int iwl4965_hw_channel_switch(struct iwl_priv *priv, u16 channel)
static int iwl4965_hw_channel_switch(struct iwl_priv *priv,
struct ieee80211_channel_switch *ch_switch)
{
int rc;
u8 band = 0;
@ -1453,11 +1454,14 @@ static int iwl4965_hw_channel_switch(struct iwl_priv *priv, u16 channel)
u8 ctrl_chan_high = 0;
struct iwl4965_channel_switch_cmd cmd;
const struct iwl_channel_info *ch_info;
u32 switch_time_in_usec, ucode_switch_time;
u16 ch;
u32 tsf_low;
u8 switch_count;
u16 beacon_interval = le16_to_cpu(priv->rxon_timing.beacon_interval);
struct ieee80211_vif *vif = priv->vif;
band = priv->band == IEEE80211_BAND_2GHZ;
ch_info = iwl_get_channel_info(priv, priv->band, channel);
is_ht40 = is_ht40_channel(priv->staging_rxon.flags);
if (is_ht40 &&
@ -1466,26 +1470,56 @@ static int iwl4965_hw_channel_switch(struct iwl_priv *priv, u16 channel)
cmd.band = band;
cmd.expect_beacon = 0;
cmd.channel = cpu_to_le16(channel);
ch = ieee80211_frequency_to_channel(ch_switch->channel->center_freq);
cmd.channel = cpu_to_le16(ch);
cmd.rxon_flags = priv->staging_rxon.flags;
cmd.rxon_filter_flags = priv->staging_rxon.filter_flags;
cmd.switch_time = cpu_to_le32(priv->ucode_beacon_time);
switch_count = ch_switch->count;
tsf_low = ch_switch->timestamp & 0x0ffffffff;
/*
* calculate the ucode channel switch time
* adding TSF as one of the factor for when to switch
*/
if ((priv->ucode_beacon_time > tsf_low) && beacon_interval) {
if (switch_count > ((priv->ucode_beacon_time - tsf_low) /
beacon_interval)) {
switch_count -= (priv->ucode_beacon_time -
tsf_low) / beacon_interval;
} else
switch_count = 0;
}
if (switch_count <= 1)
cmd.switch_time = cpu_to_le32(priv->ucode_beacon_time);
else {
switch_time_in_usec =
vif->bss_conf.beacon_int * switch_count * TIME_UNIT;
ucode_switch_time = iwl_usecs_to_beacons(priv,
switch_time_in_usec,
beacon_interval);
cmd.switch_time = iwl_add_beacon_time(priv,
priv->ucode_beacon_time,
ucode_switch_time,
beacon_interval);
}
IWL_DEBUG_11H(priv, "uCode time for the switch is 0x%x\n",
cmd.switch_time);
ch_info = iwl_get_channel_info(priv, priv->band, ch);
if (ch_info)
cmd.expect_beacon = is_channel_radar(ch_info);
else {
IWL_ERR(priv, "invalid channel switch from %u to %u\n",
priv->active_rxon.channel, channel);
priv->active_rxon.channel, ch);
return -EFAULT;
}
rc = iwl4965_fill_txpower_tbl(priv, band, channel, is_ht40,
rc = iwl4965_fill_txpower_tbl(priv, band, ch, is_ht40,
ctrl_chan_high, &cmd.tx_power);
if (rc) {
IWL_DEBUG_11H(priv, "error:%d fill txpower_tbl\n", rc);
return rc;
}
priv->switch_rxon.channel = cpu_to_le16(channel);
priv->switch_rxon.channel = cmd.channel;
priv->switch_rxon.switch_in_progress = true;
return iwl_send_cmd_pdu(priv, REPLY_CHANNEL_SWITCH, sizeof(cmd), &cmd);

52
drivers/net/wireless/iwlwifi/iwl-5000.c
View File

@ -271,10 +271,17 @@ static void iwl5150_temperature(struct iwl_priv *priv)
iwl_tt_handler(priv);
}
static int iwl5000_hw_channel_switch(struct iwl_priv *priv, u16 channel)
static int iwl5000_hw_channel_switch(struct iwl_priv *priv,
struct ieee80211_channel_switch *ch_switch)
{
struct iwl5000_channel_switch_cmd cmd;
const struct iwl_channel_info *ch_info;
u32 switch_time_in_usec, ucode_switch_time;
u16 ch;
u32 tsf_low;
u8 switch_count;
u16 beacon_interval = le16_to_cpu(priv->rxon_timing.beacon_interval);
struct ieee80211_vif *vif = priv->vif;
struct iwl_host_cmd hcmd = {
.id = REPLY_CHANNEL_SWITCH,
.len = sizeof(cmd),
@ -282,22 +289,51 @@ static int iwl5000_hw_channel_switch(struct iwl_priv *priv, u16 channel)
.data = &cmd,
};
IWL_DEBUG_11H(priv, "channel switch from %d to %d\n",
priv->active_rxon.channel, channel);
cmd.band = priv->band == IEEE80211_BAND_2GHZ;
cmd.channel = cpu_to_le16(channel);
ch = ieee80211_frequency_to_channel(ch_switch->channel->center_freq);
IWL_DEBUG_11H(priv, "channel switch from %d to %d\n",
priv->active_rxon.channel, ch);
cmd.channel = cpu_to_le16(ch);
cmd.rxon_flags = priv->staging_rxon.flags;
cmd.rxon_filter_flags = priv->staging_rxon.filter_flags;
cmd.switch_time = cpu_to_le32(priv->ucode_beacon_time);
ch_info = iwl_get_channel_info(priv, priv->band, channel);
switch_count = ch_switch->count;
tsf_low = ch_switch->timestamp & 0x0ffffffff;
/*
* calculate the ucode channel switch time
* adding TSF as one of the factor for when to switch
*/
if ((priv->ucode_beacon_time > tsf_low) && beacon_interval) {
if (switch_count > ((priv->ucode_beacon_time - tsf_low) /
beacon_interval)) {
switch_count -= (priv->ucode_beacon_time -
tsf_low) / beacon_interval;
} else
switch_count = 0;
}
if (switch_count <= 1)
cmd.switch_time = cpu_to_le32(priv->ucode_beacon_time);
else {
switch_time_in_usec =
vif->bss_conf.beacon_int * switch_count * TIME_UNIT;
ucode_switch_time = iwl_usecs_to_beacons(priv,
switch_time_in_usec,
beacon_interval);
cmd.switch_time = iwl_add_beacon_time(priv,
priv->ucode_beacon_time,
ucode_switch_time,
beacon_interval);
}
IWL_DEBUG_11H(priv, "uCode time for the switch is 0x%x\n",
cmd.switch_time);
ch_info = iwl_get_channel_info(priv, priv->band, ch);
if (ch_info)
cmd.expect_beacon = is_channel_radar(ch_info);
else {
IWL_ERR(priv, "invalid channel switch from %u to %u\n",
priv->active_rxon.channel, channel);
priv->active_rxon.channel, ch);
return -EFAULT;
}
priv->switch_rxon.channel = cpu_to_le16(channel);
priv->switch_rxon.channel = cmd.channel;
priv->switch_rxon.switch_in_progress = true;
return iwl_send_cmd_sync(priv, &hcmd);

53
drivers/net/wireless/iwlwifi/iwl-6000.c
View File

@ -239,10 +239,17 @@ static int iwl6050_hw_set_hw_params(struct iwl_priv *priv)
return 0;
}
static int iwl6000_hw_channel_switch(struct iwl_priv *priv, u16 channel)
static int iwl6000_hw_channel_switch(struct iwl_priv *priv,
struct ieee80211_channel_switch *ch_switch)
{
struct iwl6000_channel_switch_cmd cmd;
const struct iwl_channel_info *ch_info;
u32 switch_time_in_usec, ucode_switch_time;
u16 ch;
u32 tsf_low;
u8 switch_count;
u16 beacon_interval = le16_to_cpu(priv->rxon_timing.beacon_interval);
struct ieee80211_vif *vif = priv->vif;
struct iwl_host_cmd hcmd = {
.id = REPLY_CHANNEL_SWITCH,
.len = sizeof(cmd),
@ -250,23 +257,51 @@ static int iwl6000_hw_channel_switch(struct iwl_priv *priv, u16 channel)
.data = &cmd,
};
IWL_DEBUG_11H(priv, "channel switch from %d to %d\n",
priv->active_rxon.channel, channel);
cmd.band = priv->band == IEEE80211_BAND_2GHZ;
cmd.channel = cpu_to_le16(channel);
ch = ieee80211_frequency_to_channel(ch_switch->channel->center_freq);
IWL_DEBUG_11H(priv, "channel switch from %u to %u\n",
priv->active_rxon.channel, ch);
cmd.channel = cpu_to_le16(ch);
cmd.rxon_flags = priv->staging_rxon.flags;
cmd.rxon_filter_flags = priv->staging_rxon.filter_flags;
cmd.switch_time = cpu_to_le32(priv->ucode_beacon_time);
ch_info = iwl_get_channel_info(priv, priv->band, channel);
switch_count = ch_switch->count;
tsf_low = ch_switch->timestamp & 0x0ffffffff;
/*
* calculate the ucode channel switch time
* adding TSF as one of the factor for when to switch
*/
if ((priv->ucode_beacon_time > tsf_low) && beacon_interval) {
if (switch_count > ((priv->ucode_beacon_time - tsf_low) /
beacon_interval)) {
switch_count -= (priv->ucode_beacon_time -
tsf_low) / beacon_interval;
} else
switch_count = 0;
}
if (switch_count <= 1)
cmd.switch_time = cpu_to_le32(priv->ucode_beacon_time);
else {
switch_time_in_usec =
vif->bss_conf.beacon_int * switch_count * TIME_UNIT;
ucode_switch_time = iwl_usecs_to_beacons(priv,
switch_time_in_usec,
beacon_interval);
cmd.switch_time = iwl_add_beacon_time(priv,
priv->ucode_beacon_time,
ucode_switch_time,
beacon_interval);
}
IWL_DEBUG_11H(priv, "uCode time for the switch is 0x%x\n",
cmd.switch_time);
ch_info = iwl_get_channel_info(priv, priv->band, ch);
if (ch_info)
cmd.expect_beacon = is_channel_radar(ch_info);
else {
IWL_ERR(priv, "invalid channel switch from %u to %u\n",
priv->active_rxon.channel, channel);
priv->active_rxon.channel, ch);
return -EFAULT;
}
priv->switch_rxon.channel = cpu_to_le16(channel);
priv->switch_rxon.channel = cmd.channel;
priv->switch_rxon.switch_in_progress = true;
return iwl_send_cmd_sync(priv, &hcmd);

95
drivers/net/wireless/iwlwifi/iwl-agn.c
View File

@ -120,7 +120,7 @@ int iwl_commit_rxon(struct iwl_priv *priv)
(priv->switch_rxon.channel != priv->staging_rxon.channel)) {
IWL_DEBUG_11H(priv, "abort channel switch on %d\n",
le16_to_cpu(priv->switch_rxon.channel));
priv->switch_rxon.switch_in_progress = false;
iwl_chswitch_done(priv, false);
}
/* If we don't need to send a full RXON, we can use
@ -3325,6 +3325,98 @@ static int iwlagn_mac_sta_add(struct ieee80211_hw *hw,
return 0;
}
static void iwl_mac_channel_switch(struct ieee80211_hw *hw,
struct ieee80211_channel_switch *ch_switch)
{
struct iwl_priv *priv = hw->priv;
const struct iwl_channel_info *ch_info;
struct ieee80211_conf *conf = &hw->conf;
struct iwl_ht_config *ht_conf = &priv->current_ht_config;
u16 ch;
unsigned long flags = 0;
IWL_DEBUG_MAC80211(priv, "enter\n");
if (iwl_is_rfkill(priv))
goto out_exit;
if (test_bit(STATUS_EXIT_PENDING, &priv->status) ||
test_bit(STATUS_SCANNING, &priv->status))
goto out_exit;
if (!iwl_is_associated(priv))
goto out_exit;
/* channel switch in progress */
if (priv->switch_rxon.switch_in_progress == true)
goto out_exit;
mutex_lock(&priv->mutex);
if (priv->cfg->ops->lib->set_channel_switch) {
ch = ieee80211_frequency_to_channel(
ch_switch->channel->center_freq);
if (le16_to_cpu(priv->active_rxon.channel) != ch) {
ch_info = iwl_get_channel_info(priv,
conf->channel->band,
ch);
if (!is_channel_valid(ch_info)) {
IWL_DEBUG_MAC80211(priv, "invalid channel\n");
goto out;
}
spin_lock_irqsave(&priv->lock, flags);
priv->current_ht_config.smps = conf->smps_mode;
/* Configure HT40 channels */
ht_conf->is_ht = conf_is_ht(conf);
if (ht_conf->is_ht) {
if (conf_is_ht40_minus(conf)) {
ht_conf->extension_chan_offset =
IEEE80211_HT_PARAM_CHA_SEC_BELOW;
ht_conf->is_40mhz = true;
} else if (conf_is_ht40_plus(conf)) {
ht_conf->extension_chan_offset =
IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
ht_conf->is_40mhz = true;
} else {
ht_conf->extension_chan_offset =
IEEE80211_HT_PARAM_CHA_SEC_NONE;
ht_conf->is_40mhz = false;
}
} else
ht_conf->is_40mhz = false;
/* if we are switching from ht to 2.4 clear flags
* from any ht related info since 2.4 does not
* support ht */
if ((le16_to_cpu(priv->staging_rxon.channel) != ch))
priv->staging_rxon.flags = 0;
iwl_set_rxon_channel(priv, conf->channel);
iwl_set_rxon_ht(priv, ht_conf);
iwl_set_flags_for_band(priv, conf->channel->band,
priv->vif);
spin_unlock_irqrestore(&priv->lock, flags);
iwl_set_rate(priv);
/*
* at this point, staging_rxon has the
* configuration for channel switch
*/
if (priv->cfg->ops->lib->set_channel_switch(priv,
ch_switch))
priv->switch_rxon.switch_in_progress = false;
}
}
out:
mutex_unlock(&priv->mutex);
out_exit:
if (!priv->switch_rxon.switch_in_progress)
ieee80211_chswitch_done(priv->vif, false);
IWL_DEBUG_MAC80211(priv, "leave\n");
}
/*****************************************************************************
*
* sysfs attributes
@ -3646,6 +3738,7 @@ static struct ieee80211_ops iwl_hw_ops = {
.sta_notify = iwl_mac_sta_notify,
.sta_add = iwlagn_mac_sta_add,
.sta_remove = iwl_mac_sta_remove,
.channel_switch = iwl_mac_channel_switch,
};
static int iwl_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)

48
drivers/net/wireless/iwlwifi/iwl-core.c
View File

@ -893,9 +893,9 @@ int iwl_set_rxon_channel(struct iwl_priv *priv, struct ieee80211_channel *ch)
}
EXPORT_SYMBOL(iwl_set_rxon_channel);
static void iwl_set_flags_for_band(struct iwl_priv *priv,
enum ieee80211_band band,
struct ieee80211_vif *vif)
void iwl_set_flags_for_band(struct iwl_priv *priv,
enum ieee80211_band band,
struct ieee80211_vif *vif)
{
if (band == IEEE80211_BAND_5GHZ) {
priv->staging_rxon.flags &=
@ -914,6 +914,7 @@ static void iwl_set_flags_for_band(struct iwl_priv *priv,
priv->staging_rxon.flags &= ~RXON_FLG_CCK_MSK;
}
}
EXPORT_SYMBOL(iwl_set_flags_for_band);
/*
* initialize rxon structure with default values from eeprom
@ -989,7 +990,7 @@ void iwl_connection_init_rx_config(struct iwl_priv *priv,
}
EXPORT_SYMBOL(iwl_connection_init_rx_config);
static void iwl_set_rate(struct iwl_priv *priv)
void iwl_set_rate(struct iwl_priv *priv)
{
const struct ieee80211_supported_band *hw = NULL;
struct ieee80211_rate *rate;
@ -1017,6 +1018,21 @@ static void iwl_set_rate(struct iwl_priv *priv)
priv->staging_rxon.ofdm_basic_rates =
(IWL_OFDM_BASIC_RATES_MASK >> IWL_FIRST_OFDM_RATE) & 0xFF;
}
EXPORT_SYMBOL(iwl_set_rate);
void iwl_chswitch_done(struct iwl_priv *priv, bool is_success)
{
if (test_bit(STATUS_EXIT_PENDING, &priv->status))
return;
if (priv->switch_rxon.switch_in_progress) {
ieee80211_chswitch_done(priv->vif, is_success);
mutex_lock(&priv->mutex);
priv->switch_rxon.switch_in_progress = false;
mutex_unlock(&priv->mutex);
}
}
EXPORT_SYMBOL(iwl_chswitch_done);
void iwl_rx_csa(struct iwl_priv *priv, struct iwl_rx_mem_buffer *rxb)
{
@ -1031,11 +1047,12 @@ void iwl_rx_csa(struct iwl_priv *priv, struct iwl_rx_mem_buffer *rxb)
priv->staging_rxon.channel = csa->channel;
IWL_DEBUG_11H(priv, "CSA notif: channel %d\n",
le16_to_cpu(csa->channel));
} else
iwl_chswitch_done(priv, true);
} else {
IWL_ERR(priv, "CSA notif (fail) : channel %d\n",
le16_to_cpu(csa->channel));
priv->switch_rxon.switch_in_progress = false;
iwl_chswitch_done(priv, false);
}
}
}
EXPORT_SYMBOL(iwl_rx_csa);
@ -2044,22 +2061,7 @@ int iwl_mac_config(struct ieee80211_hw *hw, u32 changed)
iwl_set_flags_for_band(priv, conf->channel->band, priv->vif);
spin_unlock_irqrestore(&priv->lock, flags);
if (iwl_is_associated(priv) &&
(le16_to_cpu(priv->active_rxon.channel) != ch) &&
priv->cfg->ops->lib->set_channel_switch) {
iwl_set_rate(priv);
/*
* at this point, staging_rxon has the
* configuration for channel switch
*/
ret = priv->cfg->ops->lib->set_channel_switch(priv,
ch);
if (!ret) {
iwl_print_rx_config_cmd(priv);
goto out;
}
priv->switch_rxon.switch_in_progress = false;
}
set_ch_out:
/* The list of supported rates and rate mask can be different
* for each band; since the band may have changed, reset

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

@ -175,7 +175,8 @@ struct iwl_lib_ops {
void (*dump_nic_error_log)(struct iwl_priv *priv);
void (*dump_csr)(struct iwl_priv *priv);
int (*dump_fh)(struct iwl_priv *priv, char **buf, bool display);
int (*set_channel_switch)(struct iwl_priv *priv, u16 channel);
int (*set_channel_switch)(struct iwl_priv *priv,
struct ieee80211_channel_switch *ch_switch);
/* power management */
struct iwl_apm_ops apm_ops;
@ -345,11 +346,15 @@ int iwl_check_rxon_cmd(struct iwl_priv *priv);
int iwl_full_rxon_required(struct iwl_priv *priv);
void iwl_set_rxon_chain(struct iwl_priv *priv);
int iwl_set_rxon_channel(struct iwl_priv *priv, struct ieee80211_channel *ch);
void iwl_set_flags_for_band(struct iwl_priv *priv,
enum ieee80211_band band,
struct ieee80211_vif *vif);
void iwl_set_rxon_ht(struct iwl_priv *priv, struct iwl_ht_config *ht_conf);
u8 iwl_is_ht40_tx_allowed(struct iwl_priv *priv,
struct ieee80211_sta_ht_cap *sta_ht_inf);
void iwl_connection_init_rx_config(struct iwl_priv *priv,
struct ieee80211_vif *vif);
void iwl_set_rate(struct iwl_priv *priv);
int iwl_set_decrypted_flag(struct iwl_priv *priv,
struct ieee80211_hdr *hdr,
u32 decrypt_res,
@ -461,6 +466,7 @@ void iwl_rx_statistics(struct iwl_priv *priv,
struct iwl_rx_mem_buffer *rxb);
void iwl_reply_statistics(struct iwl_priv *priv,
struct iwl_rx_mem_buffer *rxb);
void iwl_chswitch_done(struct iwl_priv *priv, bool is_success);
void iwl_rx_csa(struct iwl_priv *priv, struct iwl_rx_mem_buffer *rxb);
/* TX helpers */