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mac80211: Add HT helper functions
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Some refactoring for IBSS HT.

Move HT info and capability IEs building code into separate functions.

Add function to get the channel type from an HT info IE.

Signed-off-by: Alexander Simon <an.alexsimon@googlemail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
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Alexander Simon authored and John W. Linville committed Nov 8, 2011
1 parent 3b69a9c commit 42e7aa7
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Showing 3 changed files with 108 additions and 45 deletions.
8 changes: 8 additions & 0 deletions net/mac80211/ieee80211_i.h
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Original file line number Diff line number Diff line change
Expand Up @@ -1333,6 +1333,12 @@ void ieee80211_recalc_smps(struct ieee80211_local *local);
size_t ieee80211_ie_split(const u8 *ies, size_t ielen,
const u8 *ids, int n_ids, size_t offset);
size_t ieee80211_ie_split_vendor(const u8 *ies, size_t ielen, size_t offset);
u8 *ieee80211_ie_build_ht_cap(u8 *pos, struct ieee80211_supported_band *sband,
u16 cap);
u8 *ieee80211_ie_build_ht_info(u8 *pos,
struct ieee80211_sta_ht_cap *ht_cap,
struct ieee80211_channel *channel,
enum nl80211_channel_type channel_type);

/* internal work items */
void ieee80211_work_init(struct ieee80211_local *local);
Expand Down Expand Up @@ -1361,6 +1367,8 @@ ieee80211_get_channel_mode(struct ieee80211_local *local,
bool ieee80211_set_channel_type(struct ieee80211_local *local,
struct ieee80211_sub_if_data *sdata,
enum nl80211_channel_type chantype);
enum nl80211_channel_type
ieee80211_ht_info_to_channel_type(struct ieee80211_ht_info *ht_info);

#ifdef CONFIG_MAC80211_NOINLINE
#define debug_noinline noinline
Expand Down
116 changes: 99 additions & 17 deletions net/mac80211/util.c
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Original file line number Diff line number Diff line change
Expand Up @@ -811,23 +811,8 @@ int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
offset = noffset;
}

if (sband->ht_cap.ht_supported) {
u16 cap = sband->ht_cap.cap;
__le16 tmp;

*pos++ = WLAN_EID_HT_CAPABILITY;
*pos++ = sizeof(struct ieee80211_ht_cap);
memset(pos, 0, sizeof(struct ieee80211_ht_cap));
tmp = cpu_to_le16(cap);
memcpy(pos, &tmp, sizeof(u16));
pos += sizeof(u16);
*pos++ = sband->ht_cap.ampdu_factor |
(sband->ht_cap.ampdu_density <<
IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT);
memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
pos += sizeof(sband->ht_cap.mcs);
pos += 2 + 4 + 1; /* ext info, BF cap, antsel */
}
if (sband->ht_cap.ht_supported)
pos = ieee80211_ie_build_ht_cap(pos, sband, sband->ht_cap.cap);

/*
* If adding more here, adjust code in main.c
Expand Down Expand Up @@ -1362,6 +1347,103 @@ void ieee80211_disable_rssi_reports(struct ieee80211_vif *vif)
}
EXPORT_SYMBOL(ieee80211_disable_rssi_reports);

u8 *ieee80211_ie_build_ht_cap(u8 *pos, struct ieee80211_supported_band *sband,
u16 cap)
{
__le16 tmp;

*pos++ = WLAN_EID_HT_CAPABILITY;
*pos++ = sizeof(struct ieee80211_ht_cap);
memset(pos, 0, sizeof(struct ieee80211_ht_cap));

/* capability flags */
tmp = cpu_to_le16(cap);
memcpy(pos, &tmp, sizeof(u16));
pos += sizeof(u16);

/* AMPDU parameters */
*pos++ = sband->ht_cap.ampdu_factor |
(sband->ht_cap.ampdu_density <<
IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT);

/* MCS set */
memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
pos += sizeof(sband->ht_cap.mcs);

/* extended capabilities */
pos += sizeof(__le16);

/* BF capabilities */
pos += sizeof(__le32);

/* antenna selection */
pos += sizeof(u8);

return pos;
}

u8 *ieee80211_ie_build_ht_info(u8 *pos,
struct ieee80211_sta_ht_cap *ht_cap,
struct ieee80211_channel *channel,
enum nl80211_channel_type channel_type)
{
struct ieee80211_ht_info *ht_info;
/* Build HT Information */
*pos++ = WLAN_EID_HT_INFORMATION;
*pos++ = sizeof(struct ieee80211_ht_info);
ht_info = (struct ieee80211_ht_info *)pos;
ht_info->control_chan =
ieee80211_frequency_to_channel(channel->center_freq);
switch (channel_type) {
case NL80211_CHAN_HT40MINUS:
ht_info->ht_param = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
break;
case NL80211_CHAN_HT40PLUS:
ht_info->ht_param = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
break;
case NL80211_CHAN_HT20:
default:
ht_info->ht_param = IEEE80211_HT_PARAM_CHA_SEC_NONE;
break;
}
if (ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40)
ht_info->ht_param |= IEEE80211_HT_PARAM_CHAN_WIDTH_ANY;
ht_info->operation_mode = 0x0000;
ht_info->stbc_param = 0x0000;

/* It seems that Basic MCS set and Supported MCS set
are identical for the first 10 bytes */
memset(&ht_info->basic_set, 0, 16);
memcpy(&ht_info->basic_set, &ht_cap->mcs, 10);

return pos + sizeof(struct ieee80211_ht_info);
}

enum nl80211_channel_type
ieee80211_ht_info_to_channel_type(struct ieee80211_ht_info *ht_info)
{
enum nl80211_channel_type channel_type;

if (!ht_info)
return NL80211_CHAN_NO_HT;

switch (ht_info->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
case IEEE80211_HT_PARAM_CHA_SEC_NONE:
channel_type = NL80211_CHAN_HT20;
break;
case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
channel_type = NL80211_CHAN_HT40PLUS;
break;
case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
channel_type = NL80211_CHAN_HT40MINUS;
break;
default:
channel_type = NL80211_CHAN_NO_HT;
}

return channel_type;
}

int ieee80211_add_srates_ie(struct ieee80211_vif *vif, struct sk_buff *skb)
{
struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
Expand Down
29 changes: 1 addition & 28 deletions net/mac80211/work.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -103,7 +103,6 @@ static void ieee80211_add_ht_ie(struct sk_buff *skb, const u8 *ht_info_ie,
u8 *pos;
u32 flags = channel->flags;
u16 cap = sband->ht_cap.cap;
__le16 tmp;

if (!sband->ht_cap.ht_supported)
return;
Expand Down Expand Up @@ -154,34 +153,8 @@ static void ieee80211_add_ht_ie(struct sk_buff *skb, const u8 *ht_info_ie,
}

/* reserve and fill IE */

pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
*pos++ = WLAN_EID_HT_CAPABILITY;
*pos++ = sizeof(struct ieee80211_ht_cap);
memset(pos, 0, sizeof(struct ieee80211_ht_cap));

/* capability flags */
tmp = cpu_to_le16(cap);
memcpy(pos, &tmp, sizeof(u16));
pos += sizeof(u16);

/* AMPDU parameters */
*pos++ = sband->ht_cap.ampdu_factor |
(sband->ht_cap.ampdu_density <<
IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT);

/* MCS set */
memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
pos += sizeof(sband->ht_cap.mcs);

/* extended capabilities */
pos += sizeof(__le16);

/* BF capabilities */
pos += sizeof(__le32);

/* antenna selection */
pos += sizeof(u8);
ieee80211_ie_build_ht_cap(pos, sband, cap);
}

static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata,
Expand Down

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