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OCV: Add function to derive Tx parameters to a specific STA

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Use the information elements that were present in the (Re)Association
Request frame to derive the maximum bandwidth the AP will use to
transmit frames to a specific STA. By using this approach, we don't need
to query the kernel for this information, and avoid having to add a
driver API for that.

Signed-off-by: Mathy Vanhoef <Mathy.Vanhoef@cs.kuleuven.be>
This commit is contained in:
Mathy Vanhoef 2018-08-06 15:46:30 -04:00 • committed by Jouni Malinen
parent 697652085f
commit 1034f67bf1
5 changed files with 118 additions and 0 deletions
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68
src/ap/ieee802_11_shared.c
View file

@ -752,3 +752,71 @@ u8 * hostapd_eid_fils_indic(struct hostapd_data *hapd, u8 *eid, int hessid)
return pos;
}
#ifdef CONFIG_OCV
int get_tx_parameters(struct sta_info *sta, int ap_max_chanwidth,
int ap_seg1_idx, int *bandwidth, int *seg1_idx)
{
int ht_40mhz = 0;
int vht_80p80 = 0;
int requested_bw;
if (sta->ht_capabilities)
ht_40mhz = !!(sta->ht_capabilities->ht_capabilities_info &
HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET);
if (sta->vht_operation) {
struct ieee80211_vht_operation *oper = sta->vht_operation;
/*
* If a VHT Operation element was present, use it to determine
* the supported channel bandwidth.
*/
if (oper->vht_op_info_chwidth == 0) {
requested_bw = ht_40mhz ? 40 : 20;
} else if (oper->vht_op_info_chan_center_freq_seg1_idx == 0) {
requested_bw = 80;
} else {
int diff;
requested_bw = 160;
diff = abs((int)
oper->vht_op_info_chan_center_freq_seg0_idx -
(int)
oper->vht_op_info_chan_center_freq_seg1_idx);
vht_80p80 = oper->vht_op_info_chan_center_freq_seg1_idx
!= 0 && diff > 16;
}
} else if (sta->vht_capabilities) {
struct ieee80211_vht_capabilities *capab;
int vht_chanwidth;
capab = sta->vht_capabilities;
/*
* If only the VHT Capabilities element is present (e.g., for
* normal clients), use it to determine the supported channel
* bandwidth.
*/
vht_chanwidth = capab->vht_capabilities_info &
VHT_CAP_SUPP_CHAN_WIDTH_MASK;
vht_80p80 = capab->vht_capabilities_info &
VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ;
/* TODO: Also take into account Extended NSS BW Support field */
requested_bw = vht_chanwidth ? 160 : 80;
} else {
requested_bw = ht_40mhz ? 40 : 20;
}
*bandwidth = requested_bw < ap_max_chanwidth ?
requested_bw : ap_max_chanwidth;
*seg1_idx = 0;
if (ap_seg1_idx && vht_80p80)
*seg1_idx = ap_seg1_idx;
return 0;
}
#endif /* CONFIG_OCV */