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mac80211: support VHT association 

Determine the VHT channel from the AP's VHT operation IE
(if present) and configure the hardware to that channel
if it is supported. If channel contexts cause a channel
to not be usable, try a smaller bandwidth.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Johannes Berg 2012-11-22 14:11:39 +01:00
parent 9f5e8f6efc
commit f2d9d270c1
3 changed files with 313 additions and 72 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
include/linux/ieee80211.h
View File

@ -1212,6 +1212,21 @@ struct ieee80211_vht_cap {
struct ieee80211_vht_mcs_info supp_mcs;
} __packed;
/**
* enum ieee80211_vht_chanwidth - VHT channel width
* @IEEE80211_VHT_CHANWIDTH_USE_HT: use the HT operation IE to
* determine the channel width (20 or 40 MHz)
* @IEEE80211_VHT_CHANWIDTH_80MHZ: 80 MHz bandwidth
* @IEEE80211_VHT_CHANWIDTH_160MHZ: 160 MHz bandwidth
* @IEEE80211_VHT_CHANWIDTH_80P80MHZ: 80+80 MHz bandwidth
*/
enum ieee80211_vht_chanwidth {
IEEE80211_VHT_CHANWIDTH_USE_HT = 0,
IEEE80211_VHT_CHANWIDTH_80MHZ = 1,
IEEE80211_VHT_CHANWIDTH_160MHZ = 2,
IEEE80211_VHT_CHANWIDTH_80P80MHZ = 3,
};
/**
* struct ieee80211_vht_operation - VHT operation IE
*

2
net/mac80211/ieee80211_i.h
View File

@ -371,6 +371,8 @@ enum ieee80211_sta_flags {
IEEE80211_STA_RESET_SIGNAL_AVE = BIT(9),
IEEE80211_STA_DISABLE_40MHZ = BIT(10),
IEEE80211_STA_DISABLE_VHT = BIT(11),
IEEE80211_STA_DISABLE_80P80MHZ = BIT(12),
IEEE80211_STA_DISABLE_160MHZ = BIT(13),
};
struct ieee80211_mgd_auth_data {

368
net/mac80211/mlme.c
View File

@ -354,6 +354,16 @@ static void ieee80211_add_vht_ie(struct ieee80211_sub_if_data *sdata,
/* determine capability flags */
cap = vht_cap.cap;
if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_80P80MHZ) {
cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ;
cap |= IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
}
if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_160MHZ) {
cap &= ~IEEE80211_VHT_CAP_SHORT_GI_160;
cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
}
/* reserve and fill IE */
pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
ieee80211_ie_build_vht_cap(pos, &vht_cap, cap);
@ -543,6 +553,10 @@ static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
offset = noffset;
}
if (WARN_ON_ONCE((ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)))
ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
ieee80211_add_ht_ie(sdata, skb, assoc_data->ap_ht_param,
sband, chan, sdata->smps_mode);
@ -3183,23 +3197,270 @@ int ieee80211_max_network_latency(struct notifier_block *nb,
return 0;
}
static u32 chandef_downgrade(struct cfg80211_chan_def *c)
{
u32 ret;
int tmp;
switch (c->width) {
case NL80211_CHAN_WIDTH_20:
c->width = NL80211_CHAN_WIDTH_20_NOHT;
ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
break;
case NL80211_CHAN_WIDTH_40:
c->width = NL80211_CHAN_WIDTH_20;
c->center_freq1 = c->chan->center_freq;
ret = IEEE80211_STA_DISABLE_40MHZ |
IEEE80211_STA_DISABLE_VHT;
break;
case NL80211_CHAN_WIDTH_80:
tmp = (30 + c->chan->center_freq - c->center_freq1)/20;
/* n_P40 */
tmp /= 2;
/* freq_P40 */
c->center_freq1 = c->center_freq1 - 20 + 40 * tmp;
c->width = NL80211_CHAN_WIDTH_40;
ret = IEEE80211_STA_DISABLE_VHT;
break;
case NL80211_CHAN_WIDTH_80P80:
c->center_freq2 = 0;
c->width = NL80211_CHAN_WIDTH_80;
ret = IEEE80211_STA_DISABLE_80P80MHZ |
IEEE80211_STA_DISABLE_160MHZ;
break;
case NL80211_CHAN_WIDTH_160:
/* n_P20 */
tmp = (70 + c->chan->center_freq - c->center_freq1)/20;
/* n_P80 */
tmp /= 4;
c->center_freq1 = c->center_freq1 - 40 + 80 * tmp;
c->width = NL80211_CHAN_WIDTH_80;
ret = IEEE80211_STA_DISABLE_80P80MHZ |
IEEE80211_STA_DISABLE_160MHZ;
break;
default:
case NL80211_CHAN_WIDTH_20_NOHT:
WARN_ON_ONCE(1);
c->width = NL80211_CHAN_WIDTH_20_NOHT;
ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
break;
}
WARN_ON_ONCE(!cfg80211_chandef_valid(c));
return ret;
}
static u32
ieee80211_determine_chantype(struct ieee80211_sub_if_data *sdata,
struct ieee80211_supported_band *sband,
struct ieee80211_channel *channel,
const struct ieee80211_ht_operation *ht_oper,
const struct ieee80211_vht_operation *vht_oper,
struct cfg80211_chan_def *chandef)
{
struct cfg80211_chan_def vht_chandef;
u32 ht_cfreq, ret;
chandef->chan = channel;
chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
chandef->center_freq1 = channel->center_freq;
chandef->center_freq2 = 0;
if (!ht_oper || !sband->ht_cap.ht_supported) {
ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
goto out;
}
chandef->width = NL80211_CHAN_WIDTH_20;
ht_cfreq = ieee80211_channel_to_frequency(ht_oper->primary_chan,
channel->band);
/* check that channel matches the right operating channel */
if (channel->center_freq != ht_cfreq) {
/*
* It's possible that some APs are confused here;
* Netgear WNDR3700 sometimes reports 4 higher than
* the actual channel in association responses, but
* since we look at probe response/beacon data here
* it should be OK.
*/
sdata_info(sdata,
"Wrong control channel: center-freq: %d ht-cfreq: %d ht->primary_chan: %d band: %d - Disabling HT\n",
channel->center_freq, ht_cfreq,
ht_oper->primary_chan, channel->band);
ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
goto out;
}
/* check 40 MHz support, if we have it */
if (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) {
switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
chandef->width = NL80211_CHAN_WIDTH_40;
chandef->center_freq1 += 10;
break;
case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
chandef->width = NL80211_CHAN_WIDTH_40;
chandef->center_freq1 -= 10;
break;
}
} else {
/* 40 MHz (and 80 MHz) must be supported for VHT */
ret = IEEE80211_STA_DISABLE_VHT;
goto out;
}
if (!vht_oper || !sband->vht_cap.vht_supported) {
ret = IEEE80211_STA_DISABLE_VHT;
goto out;
}
vht_chandef.chan = channel;
vht_chandef.center_freq1 =
ieee80211_channel_to_frequency(vht_oper->center_freq_seg1_idx,
channel->band);
vht_chandef.center_freq2 = 0;
if (vht_oper->center_freq_seg2_idx)
vht_chandef.center_freq2 =
ieee80211_channel_to_frequency(
vht_oper->center_freq_seg2_idx,
channel->band);
switch (vht_oper->chan_width) {
case IEEE80211_VHT_CHANWIDTH_USE_HT:
vht_chandef.width = chandef->width;
break;
case IEEE80211_VHT_CHANWIDTH_80MHZ:
vht_chandef.width = NL80211_CHAN_WIDTH_80;
break;
case IEEE80211_VHT_CHANWIDTH_160MHZ:
vht_chandef.width = NL80211_CHAN_WIDTH_160;
break;
case IEEE80211_VHT_CHANWIDTH_80P80MHZ:
vht_chandef.width = NL80211_CHAN_WIDTH_80P80;
break;
default:
sdata_info(sdata,
"AP VHT operation IE has invalid channel width (%d), disable VHT\n",
vht_oper->chan_width);
ret = IEEE80211_STA_DISABLE_VHT;
goto out;
}
if (!cfg80211_chandef_valid(&vht_chandef)) {
sdata_info(sdata,
"AP VHT information is invalid, disable VHT\n");
ret = IEEE80211_STA_DISABLE_VHT;
goto out;
}
if (cfg80211_chandef_identical(chandef, &vht_chandef)) {
ret = 0;
goto out;
}
if (!cfg80211_chandef_compatible(chandef, &vht_chandef)) {
sdata_info(sdata,
"AP VHT information doesn't match HT, disable VHT\n");
ret = IEEE80211_STA_DISABLE_VHT;
goto out;
}
*chandef = vht_chandef;
ret = 0;
while (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef,
IEEE80211_CHAN_DISABLED)) {
if (WARN_ON(chandef->width == NL80211_CHAN_WIDTH_20_NOHT)) {
ret = IEEE80211_STA_DISABLE_HT |
IEEE80211_STA_DISABLE_VHT;
goto out;
}
ret = chandef_downgrade(chandef);
}
if (chandef->width != vht_chandef.width)
sdata_info(sdata,
"local regulatory prevented using AP HT/VHT configuration, downgraded\n");
out:
WARN_ON_ONCE(!cfg80211_chandef_valid(chandef));
return ret;
}
static u8 ieee80211_ht_vht_rx_chains(struct ieee80211_sub_if_data *sdata,
struct cfg80211_bss *cbss)
{
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
const u8 *ht_cap_ie, *vht_cap_ie;
const struct ieee80211_ht_cap *ht_cap;
const struct ieee80211_vht_cap *vht_cap;
u8 chains = 1;
if (ifmgd->flags & IEEE80211_STA_DISABLE_HT)
return chains;
ht_cap_ie = cfg80211_find_ie(WLAN_EID_HT_CAPABILITY,
cbss->information_elements,
cbss->len_information_elements);
if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap)) {
ht_cap = (void *)(ht_cap_ie + 2);
chains = ieee80211_mcs_to_chains(&ht_cap->mcs);
/*
* TODO: use "Tx Maximum Number Spatial Streams Supported" and
* "Tx Unequal Modulation Supported" fields.
*/
}
if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
return chains;
vht_cap_ie = cfg80211_find_ie(WLAN_EID_VHT_CAPABILITY,
cbss->information_elements,
cbss->len_information_elements);
if (vht_cap_ie && vht_cap_ie[1] >= sizeof(*vht_cap)) {
u8 nss;
u16 tx_mcs_map;
vht_cap = (void *)(vht_cap_ie + 2);
tx_mcs_map = le16_to_cpu(vht_cap->supp_mcs.tx_mcs_map);
for (nss = 8; nss > 0; nss--) {
if (((tx_mcs_map >> (2 * (nss - 1))) & 3) !=
IEEE80211_VHT_MCS_NOT_SUPPORTED)
break;
}
/* TODO: use "Tx Highest Supported Long GI Data Rate" field? */
chains = max(chains, nss);
}
return chains;
}
static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
struct cfg80211_bss *cbss)
{
struct ieee80211_local *local = sdata->local;
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
int ht_cfreq;
enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
const u8 *ht_oper_ie;
const struct ieee80211_ht_operation *ht_oper = NULL;
const struct ieee80211_vht_operation *vht_oper = NULL;
struct ieee80211_supported_band *sband;
struct cfg80211_chan_def chandef;
int ret;
sband = local->hw.wiphy->bands[cbss->channel->band];
ifmgd->flags &= ~IEEE80211_STA_DISABLE_40MHZ;
ifmgd->flags &= ~(IEEE80211_STA_DISABLE_40MHZ |
IEEE80211_STA_DISABLE_80P80MHZ |
IEEE80211_STA_DISABLE_160MHZ);
if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
sband->ht_cap.ht_supported) {
const u8 *ht_oper_ie;
if (sband->ht_cap.ht_supported) {
ht_oper_ie = cfg80211_find_ie(WLAN_EID_HT_OPERATION,
cbss->information_elements,
cbss->len_information_elements);
@ -3207,82 +3468,45 @@ static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
ht_oper = (void *)(ht_oper_ie + 2);
}
if (ht_oper) {
ht_cfreq = ieee80211_channel_to_frequency(ht_oper->primary_chan,
cbss->channel->band);
/* check that channel matches the right operating channel */
if (cbss->channel->center_freq != ht_cfreq) {
/*
* It's possible that some APs are confused here;
* Netgear WNDR3700 sometimes reports 4 higher than
* the actual channel in association responses, but
* since we look at probe response/beacon data here
* it should be OK.
*/
if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
sband->vht_cap.vht_supported) {
const u8 *vht_oper_ie;
vht_oper_ie = cfg80211_find_ie(WLAN_EID_VHT_OPERATION,
cbss->information_elements,
cbss->len_information_elements);
if (vht_oper_ie && vht_oper_ie[1] >= sizeof(*vht_oper))
vht_oper = (void *)(vht_oper_ie + 2);
if (vht_oper && !ht_oper) {
vht_oper = NULL;
sdata_info(sdata,
"Wrong control channel: center-freq: %d ht-cfreq: %d ht->primary_chan: %d band: %d - Disabling HT\n",
cbss->channel->center_freq,
ht_cfreq, ht_oper->primary_chan,
cbss->channel->band);
ht_oper = NULL;
"AP advertised VHT without HT, disabling both\n");
sdata->flags |= IEEE80211_STA_DISABLE_HT;
sdata->flags |= IEEE80211_STA_DISABLE_VHT;
}
}
if (ht_oper) {
/*
* cfg80211 already verified that the channel itself can
* be used, but it didn't check that we can do the right
* HT type, so do that here as well. If HT40 isn't allowed
* on this channel, disable 40 MHz operation.
*/
const u8 *ht_cap_ie;
const struct ieee80211_ht_cap *ht_cap;
u8 chains = 1;
ifmgd->flags |= ieee80211_determine_chantype(sdata, sband,
cbss->channel,
ht_oper, vht_oper,
&chandef);
channel_type = NL80211_CHAN_HT20;
if (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) {
switch (ht_oper->ht_param &
IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
if (cbss->channel->flags &
IEEE80211_CHAN_NO_HT40PLUS)
ifmgd->flags |=
IEEE80211_STA_DISABLE_40MHZ;
else
channel_type = NL80211_CHAN_HT40PLUS;
break;
case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
if (cbss->channel->flags &
IEEE80211_CHAN_NO_HT40MINUS)
ifmgd->flags |=
IEEE80211_STA_DISABLE_40MHZ;
else
channel_type = NL80211_CHAN_HT40MINUS;
break;
}
}
ht_cap_ie = cfg80211_find_ie(WLAN_EID_HT_CAPABILITY,
cbss->information_elements,
cbss->len_information_elements);
if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap)) {
ht_cap = (void *)(ht_cap_ie + 2);
chains = ieee80211_mcs_to_chains(&ht_cap->mcs);
}
sdata->needed_rx_chains = min(chains, local->rx_chains);
} else {
sdata->needed_rx_chains = 1;
sdata->u.mgd.flags |= IEEE80211_STA_DISABLE_HT;
}
sdata->needed_rx_chains = min(ieee80211_ht_vht_rx_chains(sdata, cbss),
local->rx_chains);
/* will change later if needed */
sdata->smps_mode = IEEE80211_SMPS_OFF;
ieee80211_vif_release_channel(sdata);
cfg80211_chandef_create(&chandef, cbss->channel, channel_type);
return ieee80211_vif_use_channel(sdata, &chandef,
IEEE80211_CHANCTX_SHARED);
/*
* If this fails (possibly due to channel context sharing
* on incompatible channels, e.g. 80+80 and 160 sharing the
* same control channel) try to use a smaller bandwidth.
*/
ret = ieee80211_vif_use_channel(sdata, &chandef,
IEEE80211_CHANCTX_SHARED);
while (ret && chandef.width != NL80211_CHAN_WIDTH_20_NOHT)
ifmgd->flags |= chandef_downgrade(&chandef);
return ret;
}
static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,