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freebsd-dev/sys/net80211/ieee80211_vht.c
Bjoern A. Zeeb dc32c71339 net80211: VHT correct check/option in ieee80211_vht_adjust_channel() 
In ieee80211_vht_adjust_channel() we have to check for all possible
IEEE80211_FVHT_VHT* options using the mask rather than just checking
for IEEE80211_FVHT_VHT;  ieee80211_vhtchanflags() (contrary to its
HT counterpart) only returns the "highest" flag nor or-ing them together
with the base flag.  For the moment this seems to make sense as with
more width options we'd add a pyramid.

Later on, in the same function when we get VHT160 actually go and look
for VHT160 and not VHT80.

Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
Reviewed by:	adrian
Differential Revision: https://reviews.freebsd.org/D35977
2022-07-29 15:10:45 +00:00

867 lines
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/*-
* Copyright (c) 2017 Adrian Chadd <adrian@FreeBSD.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#ifdef __FreeBSD__
__FBSDID("$FreeBSD$");
#endif
/*
* IEEE 802.11ac-2013 protocol support.
*/
#include "opt_inet.h"
#include "opt_wlan.h"
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/systm.h>
#include <sys/endian.h>
#include <sys/socket.h>
#include <net/if.h>
#include <net/if_var.h>
#include <net/if_media.h>
#include <net/ethernet.h>
#include <net80211/ieee80211_var.h>
#include <net80211/ieee80211_action.h>
#include <net80211/ieee80211_input.h>
#include <net80211/ieee80211_vht.h>
#define ADDSHORT(frm, v) do { \
frm[0] = (v) & 0xff; \
frm[1] = (v) >> 8; \
frm += 2; \
} while (0)
#define ADDWORD(frm, v) do { \
frm[0] = (v) & 0xff; \
frm[1] = ((v) >> 8) & 0xff; \
frm[2] = ((v) >> 16) & 0xff; \
frm[3] = ((v) >> 24) & 0xff; \
frm += 4; \
} while (0)
/*
* Immediate TODO:
*
* + handle WLAN_ACTION_VHT_OPMODE_NOTIF and other VHT action frames
* + ensure vhtinfo/vhtcap parameters correctly use the negotiated
* capabilities and ratesets
* + group ID management operation
*/
/*
* XXX TODO: handle WLAN_ACTION_VHT_OPMODE_NOTIF
*
* Look at mac80211/vht.c:ieee80211_vht_handle_opmode() for further details.
*/
static int
vht_recv_action_placeholder(struct ieee80211_node *ni,
const struct ieee80211_frame *wh,
const uint8_t *frm, const uint8_t *efrm)
{
#ifdef IEEE80211_DEBUG
ieee80211_note(ni->ni_vap, "%s: called; fc=0x%.2x/0x%.2x",
__func__, wh->i_fc[0], wh->i_fc[1]);
#endif
return (0);
}
static int
vht_send_action_placeholder(struct ieee80211_node *ni,
int category, int action, void *arg0)
{
#ifdef IEEE80211_DEBUG
ieee80211_note(ni->ni_vap, "%s: called; category=%d, action=%d",
__func__, category, action);
#endif
return (EINVAL);
}
static void
ieee80211_vht_init(void)
{
ieee80211_recv_action_register(IEEE80211_ACTION_CAT_VHT,
WLAN_ACTION_VHT_COMPRESSED_BF, vht_recv_action_placeholder);
ieee80211_recv_action_register(IEEE80211_ACTION_CAT_VHT,
WLAN_ACTION_VHT_GROUPID_MGMT, vht_recv_action_placeholder);
ieee80211_recv_action_register(IEEE80211_ACTION_CAT_VHT,
WLAN_ACTION_VHT_OPMODE_NOTIF, vht_recv_action_placeholder);
ieee80211_send_action_register(IEEE80211_ACTION_CAT_VHT,
WLAN_ACTION_VHT_COMPRESSED_BF, vht_send_action_placeholder);
ieee80211_send_action_register(IEEE80211_ACTION_CAT_VHT,
WLAN_ACTION_VHT_GROUPID_MGMT, vht_send_action_placeholder);
ieee80211_send_action_register(IEEE80211_ACTION_CAT_VHT,
WLAN_ACTION_VHT_OPMODE_NOTIF, vht_send_action_placeholder);
}
SYSINIT(wlan_vht, SI_SUB_DRIVERS, SI_ORDER_FIRST, ieee80211_vht_init, NULL);
void
ieee80211_vht_attach(struct ieee80211com *ic)
{
}
void
ieee80211_vht_detach(struct ieee80211com *ic)
{
}
void
ieee80211_vht_vattach(struct ieee80211vap *vap)
{
struct ieee80211com *ic = vap->iv_ic;
if (! IEEE80211_CONF_VHT(ic))
return;
vap->iv_vhtcaps = ic->ic_vhtcaps;
vap->iv_vhtextcaps = ic->ic_vhtextcaps;
/* XXX assume VHT80 support; should really check vhtcaps */
vap->iv_flags_vht =
IEEE80211_FVHT_VHT
| IEEE80211_FVHT_USEVHT40
| IEEE80211_FVHT_USEVHT80;
if (IEEE80211_VHTCAP_SUPP_CHAN_WIDTH_IS_160MHZ(vap->iv_vhtcaps))
vap->iv_flags_vht |= IEEE80211_FVHT_USEVHT160;
if (IEEE80211_VHTCAP_SUPP_CHAN_WIDTH_IS_160_80P80MHZ(vap->iv_vhtcaps))
vap->iv_flags_vht |= IEEE80211_FVHT_USEVHT80P80;
memcpy(&vap->iv_vht_mcsinfo, &ic->ic_vht_mcsinfo,
sizeof(struct ieee80211_vht_mcs_info));
}
void
ieee80211_vht_vdetach(struct ieee80211vap *vap)
{
}
#if 0
static void
vht_announce(struct ieee80211com *ic, enum ieee80211_phymode mode)
{
}
#endif
static int
vht_mcs_to_num(int m)
{
switch (m) {
case IEEE80211_VHT_MCS_SUPPORT_0_7:
return (7);
case IEEE80211_VHT_MCS_SUPPORT_0_8:
return (8);
case IEEE80211_VHT_MCS_SUPPORT_0_9:
return (9);
default:
return (0);
}
}
void
ieee80211_vht_announce(struct ieee80211com *ic)
{
int i, tx, rx;
if (! IEEE80211_CONF_VHT(ic))
return;
/* Channel width */
ic_printf(ic, "[VHT] Channel Widths: 20MHz, 40MHz, 80MHz%s%s\n",
(IEEE80211_VHTCAP_SUPP_CHAN_WIDTH_IS_160MHZ(ic->ic_vhtcaps)) ?
", 160MHz" : "",
(IEEE80211_VHTCAP_SUPP_CHAN_WIDTH_IS_160_80P80MHZ(ic->ic_vhtcaps)) ?
", 80+80MHz" : "");
/* Features */
ic_printf(ic, "[VHT] Features: %b\n", ic->ic_vhtcaps,
IEEE80211_VHTCAP_BITS);
/* For now, just 5GHz VHT. Worry about 2GHz VHT later */
for (i = 0; i < 8; i++) {
/* Each stream is 2 bits */
tx = (ic->ic_vht_mcsinfo.tx_mcs_map >> (2*i)) & 0x3;
rx = (ic->ic_vht_mcsinfo.rx_mcs_map >> (2*i)) & 0x3;
if (tx == 3 && rx == 3)
continue;
ic_printf(ic, "[VHT] NSS %d: TX MCS 0..%d, RX MCS 0..%d\n",
i + 1, vht_mcs_to_num(tx), vht_mcs_to_num(rx));
}
}
void
ieee80211_vht_node_init(struct ieee80211_node *ni)
{
IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N, ni,
"%s: called", __func__);
ni->ni_flags |= IEEE80211_NODE_VHT;
}
void
ieee80211_vht_node_cleanup(struct ieee80211_node *ni)
{
IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N, ni,
"%s: called", __func__);
ni->ni_flags &= ~IEEE80211_NODE_VHT;
ni->ni_vhtcap = 0;
bzero(&ni->ni_vht_mcsinfo, sizeof(struct ieee80211_vht_mcs_info));
}
/*
* Parse an 802.11ac VHT operation IE.
*/
void
ieee80211_parse_vhtopmode(struct ieee80211_node *ni, const uint8_t *ie)
{
/* vht operation */
ni->ni_vht_chanwidth = ie[2];
ni->ni_vht_chan1 = ie[3];
ni->ni_vht_chan2 = ie[4];
ni->ni_vht_basicmcs = le16dec(ie + 5);
#if 0
printf("%s: chan1=%d, chan2=%d, chanwidth=%d, basicmcs=0x%04x\n",
__func__, ni->ni_vht_chan1, ni->ni_vht_chan2, ni->ni_vht_chanwidth,
ni->ni_vht_basicmcs);
#endif
}
/*
* Parse an 802.11ac VHT capability IE.
*/
void
ieee80211_parse_vhtcap(struct ieee80211_node *ni, const uint8_t *ie)
{
/* vht capability */
ni->ni_vhtcap = le32dec(ie + 2);
/* suppmcs */
ni->ni_vht_mcsinfo.rx_mcs_map = le16dec(ie + 6);
ni->ni_vht_mcsinfo.rx_highest = le16dec(ie + 8);
ni->ni_vht_mcsinfo.tx_mcs_map = le16dec(ie + 10);
ni->ni_vht_mcsinfo.tx_highest = le16dec(ie + 12);
}
int
ieee80211_vht_updateparams(struct ieee80211_node *ni,
const uint8_t *vhtcap_ie,
const uint8_t *vhtop_ie)
{
//printf("%s: called\n", __func__);
ieee80211_parse_vhtcap(ni, vhtcap_ie);
ieee80211_parse_vhtopmode(ni, vhtop_ie);
return (0);
}
void
ieee80211_setup_vht_rates(struct ieee80211_node *ni,
const uint8_t *vhtcap_ie,
const uint8_t *vhtop_ie)
{
//printf("%s: called\n", __func__);
/* XXX TODO */
}
void
ieee80211_vht_timeout(struct ieee80211vap *vap)
{
}
void
ieee80211_vht_node_join(struct ieee80211_node *ni)
{
IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N, ni,
"%s: called", __func__);
}
void
ieee80211_vht_node_leave(struct ieee80211_node *ni)
{
IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N, ni,
"%s: called", __func__);
}
/*
* Calculate the VHTCAP IE for a given node.
*
* This includes calculating the capability intersection based on the
* current operating mode and intersection of the TX/RX MCS maps.
*
* The standard only makes it clear about MCS rate negotiation
* and MCS basic rates (which must be a subset of the general
* negotiated rates). It doesn't make it clear that the AP should
* figure out the minimum functional overlap with the STA and
* support that.
*
* Note: this is in host order, not in 802.11 endian order.
*
* TODO: ensure I re-read 9.7.11 Rate Selection for VHT STAs.
*
* TODO: investigate what we should negotiate for MU-MIMO beamforming
* options.
*
* opmode is '1' for "vhtcap as if I'm a STA", 0 otherwise.
*/
void
ieee80211_vht_get_vhtcap_ie(struct ieee80211_node *ni,
struct ieee80211_ie_vhtcap *vhtcap, int opmode)
{
struct ieee80211vap *vap = ni->ni_vap;
// struct ieee80211com *ic = vap->iv_ic;
uint32_t val, val1, val2;
uint32_t new_vhtcap;
int i;
vhtcap->ie = IEEE80211_ELEMID_VHT_CAP;
vhtcap->len = sizeof(struct ieee80211_ie_vhtcap) - 2;
/*
* Capabilities - it depends on whether we are a station
* or not.
*/
new_vhtcap = 0;
/*
* Station - use our desired configuration based on
* local config, local device bits and the already-learnt
* vhtcap/vhtinfo IE in the node.
*/
/* Limit MPDU size to the smaller of the two */
val2 = val1 = _IEEE80211_MASKSHIFT(vap->iv_vhtcaps,
IEEE80211_VHTCAP_MAX_MPDU_MASK);
if (opmode == 1) {
val2 = _IEEE80211_MASKSHIFT(ni->ni_vhtcap,
IEEE80211_VHTCAP_MAX_MPDU_MASK);
}
val = MIN(val1, val2);
new_vhtcap |= _IEEE80211_SHIFTMASK(val, IEEE80211_VHTCAP_MAX_MPDU_MASK);
/* Limit supp channel config */
val2 = val1 = _IEEE80211_MASKSHIFT(vap->iv_vhtcaps,
IEEE80211_VHTCAP_SUPP_CHAN_WIDTH_MASK);
if (opmode == 1) {
val2 = _IEEE80211_MASKSHIFT(ni->ni_vhtcap,
IEEE80211_VHTCAP_SUPP_CHAN_WIDTH_MASK);
}
if ((val2 == 2) &&
((vap->iv_flags_vht & IEEE80211_FVHT_USEVHT80P80) == 0))
val2 = 1;
if ((val2 == 1) &&
((vap->iv_flags_vht & IEEE80211_FVHT_USEVHT160) == 0))
val2 = 0;
val = MIN(val1, val2);
new_vhtcap |= _IEEE80211_SHIFTMASK(val,
IEEE80211_VHTCAP_SUPP_CHAN_WIDTH_MASK);
/* RX LDPC */
val2 = val1 = _IEEE80211_MASKSHIFT(vap->iv_vhtcaps,
IEEE80211_VHTCAP_RXLDPC);
if (opmode == 1) {
val2 = _IEEE80211_MASKSHIFT(ni->ni_vhtcap,
IEEE80211_VHTCAP_RXLDPC);
}
val = MIN(val1, val2);
new_vhtcap |= _IEEE80211_SHIFTMASK(val, IEEE80211_VHTCAP_RXLDPC);
/* Short-GI 80 */
val2 = val1 = _IEEE80211_MASKSHIFT(vap->iv_vhtcaps,
IEEE80211_VHTCAP_SHORT_GI_80);
if (opmode == 1) {
val2 = _IEEE80211_MASKSHIFT(ni->ni_vhtcap,
IEEE80211_VHTCAP_SHORT_GI_80);
}
val = MIN(val1, val2);
new_vhtcap |= _IEEE80211_SHIFTMASK(val, IEEE80211_VHTCAP_SHORT_GI_80);
/* Short-GI 160 */
val2 = val1 = _IEEE80211_MASKSHIFT(vap->iv_vhtcaps,
IEEE80211_VHTCAP_SHORT_GI_160);
if (opmode == 1) {
val2 = _IEEE80211_MASKSHIFT(ni->ni_vhtcap,
IEEE80211_VHTCAP_SHORT_GI_160);
}
val = MIN(val1, val2);
new_vhtcap |= _IEEE80211_SHIFTMASK(val, IEEE80211_VHTCAP_SHORT_GI_160);
/*
* STBC is slightly more complicated.
*
* In non-STA mode, we just announce our capabilities and that
* is that.
*
* In STA mode, we should calculate our capabilities based on
* local capabilities /and/ what the remote says. So:
*
* + Only TX STBC if we support it and the remote supports RX STBC;
* + Only announce RX STBC if we support it and the remote supports
* TX STBC;
* + RX STBC should be the minimum of local and remote RX STBC;
*/
/* TX STBC */
val2 = val1 = _IEEE80211_MASKSHIFT(vap->iv_vhtcaps,
IEEE80211_VHTCAP_TXSTBC);
if (opmode == 1) {
/* STA mode - enable it only if node RXSTBC is non-zero */
val2 = !! _IEEE80211_MASKSHIFT(ni->ni_vhtcap,
IEEE80211_VHTCAP_RXSTBC_MASK);
}
val = MIN(val1, val2);
/* XXX For now, use the 11n config flag */
if ((vap->iv_flags_ht & IEEE80211_FHT_STBC_TX) == 0)
val = 0;
new_vhtcap |= _IEEE80211_SHIFTMASK(val, IEEE80211_VHTCAP_TXSTBC);
/* RX STBC1..4 */
val2 = val1 = _IEEE80211_MASKSHIFT(vap->iv_vhtcaps,
IEEE80211_VHTCAP_RXSTBC_MASK);
if (opmode == 1) {
/* STA mode - enable it only if node TXSTBC is non-zero */
val2 = _IEEE80211_MASKSHIFT(ni->ni_vhtcap,
IEEE80211_VHTCAP_TXSTBC);
}
val = MIN(val1, val2);
/* XXX For now, use the 11n config flag */
if ((vap->iv_flags_ht & IEEE80211_FHT_STBC_RX) == 0)
val = 0;
new_vhtcap |= _IEEE80211_SHIFTMASK(val, IEEE80211_VHTCAP_RXSTBC_MASK);
/*
* Finally - if RXSTBC is 0, then don't enable TXSTBC.
* Strictly speaking a device can TXSTBC and not RXSTBC, but
* it would be silly.
*/
if (val == 0)
new_vhtcap &= ~IEEE80211_VHTCAP_TXSTBC;
/*
* Some of these fields require other fields to exist.
* So before using it, the parent field needs to be checked
* otherwise the overridden value may be wrong.
*
* For example, if SU beamformee is set to 0, then BF STS
* needs to be 0.
*/
/* SU Beamformer capable */
val2 = val1 = _IEEE80211_MASKSHIFT(vap->iv_vhtcaps,
IEEE80211_VHTCAP_SU_BEAMFORMER_CAPABLE);
if (opmode == 1) {
val2 = _IEEE80211_MASKSHIFT(ni->ni_vhtcap,
IEEE80211_VHTCAP_SU_BEAMFORMER_CAPABLE);
}
val = MIN(val1, val2);
new_vhtcap |= _IEEE80211_SHIFTMASK(val,
IEEE80211_VHTCAP_SU_BEAMFORMER_CAPABLE);
/* SU Beamformee capable */
val2 = val1 = _IEEE80211_MASKSHIFT(vap->iv_vhtcaps,
IEEE80211_VHTCAP_SU_BEAMFORMEE_CAPABLE);
if (opmode == 1) {
val2 = _IEEE80211_MASKSHIFT(ni->ni_vhtcap,
IEEE80211_VHTCAP_SU_BEAMFORMEE_CAPABLE);
}
val = MIN(val1, val2);
new_vhtcap |= _IEEE80211_SHIFTMASK(val,
IEEE80211_VHTCAP_SU_BEAMFORMEE_CAPABLE);
/* Beamformee STS capability - only if SU beamformee capable */
val2 = val1 = _IEEE80211_MASKSHIFT(vap->iv_vhtcaps,
IEEE80211_VHTCAP_BEAMFORMEE_STS_MASK);
if (opmode == 1) {
val2 = _IEEE80211_MASKSHIFT(ni->ni_vhtcap,
IEEE80211_VHTCAP_BEAMFORMEE_STS_MASK);
}
val = MIN(val1, val2);
if ((new_vhtcap & IEEE80211_VHTCAP_SU_BEAMFORMEE_CAPABLE) == 0)
val = 0;
new_vhtcap |= _IEEE80211_SHIFTMASK(val,
IEEE80211_VHTCAP_BEAMFORMEE_STS_MASK);
/* Sounding dimensions - only if SU beamformer capable */
val2 = val1 = _IEEE80211_MASKSHIFT(vap->iv_vhtcaps,
IEEE80211_VHTCAP_SOUNDING_DIMENSIONS_MASK);
if (opmode == 1)
val2 = _IEEE80211_MASKSHIFT(ni->ni_vhtcap,
IEEE80211_VHTCAP_SOUNDING_DIMENSIONS_MASK);
val = MIN(val1, val2);
if ((new_vhtcap & IEEE80211_VHTCAP_SU_BEAMFORMER_CAPABLE) == 0)
val = 0;
new_vhtcap |= _IEEE80211_SHIFTMASK(val,
IEEE80211_VHTCAP_SOUNDING_DIMENSIONS_MASK);
/*
* MU Beamformer capable - only if SU BFF capable, MU BFF capable
* and STA (not AP)
*/
val2 = val1 = _IEEE80211_MASKSHIFT(vap->iv_vhtcaps,
IEEE80211_VHTCAP_MU_BEAMFORMER_CAPABLE);
if (opmode == 1)
val2 = _IEEE80211_MASKSHIFT(ni->ni_vhtcap,
IEEE80211_VHTCAP_MU_BEAMFORMER_CAPABLE);
val = MIN(val1, val2);
if ((new_vhtcap & IEEE80211_VHTCAP_SU_BEAMFORMER_CAPABLE) == 0)
val = 0;
if (opmode != 1) /* Only enable for STA mode */
val = 0;
new_vhtcap |= _IEEE80211_SHIFTMASK(val,
IEEE80211_VHTCAP_SU_BEAMFORMER_CAPABLE);
/*
* MU Beamformee capable - only if SU BFE capable, MU BFE capable
* and AP (not STA)
*/
val2 = val1 = _IEEE80211_MASKSHIFT(vap->iv_vhtcaps,
IEEE80211_VHTCAP_MU_BEAMFORMEE_CAPABLE);
if (opmode == 1)
val2 = _IEEE80211_MASKSHIFT(ni->ni_vhtcap,
IEEE80211_VHTCAP_MU_BEAMFORMEE_CAPABLE);
val = MIN(val1, val2);
if ((new_vhtcap & IEEE80211_VHTCAP_SU_BEAMFORMEE_CAPABLE) == 0)
val = 0;
if (opmode != 0) /* Only enable for AP mode */
val = 0;
new_vhtcap |= _IEEE80211_SHIFTMASK(val,
IEEE80211_VHTCAP_SU_BEAMFORMEE_CAPABLE);
/* VHT TXOP PS */
val2 = val1 = _IEEE80211_MASKSHIFT(vap->iv_vhtcaps,
IEEE80211_VHTCAP_VHT_TXOP_PS);
if (opmode == 1)
val2 = _IEEE80211_MASKSHIFT(ni->ni_vhtcap,
IEEE80211_VHTCAP_VHT_TXOP_PS);
val = MIN(val1, val2);
new_vhtcap |= _IEEE80211_SHIFTMASK(val, IEEE80211_VHTCAP_VHT_TXOP_PS);
/* HTC_VHT */
val2 = val1 = _IEEE80211_MASKSHIFT(vap->iv_vhtcaps,
IEEE80211_VHTCAP_HTC_VHT);
if (opmode == 1)
val2 = _IEEE80211_MASKSHIFT(ni->ni_vhtcap,
IEEE80211_VHTCAP_HTC_VHT);
val = MIN(val1, val2);
new_vhtcap |= _IEEE80211_SHIFTMASK(val, IEEE80211_VHTCAP_HTC_VHT);
/* A-MPDU length max */
/* XXX TODO: we need a userland config knob for this */
val2 = val1 = _IEEE80211_MASKSHIFT(vap->iv_vhtcaps,
IEEE80211_VHTCAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK);
if (opmode == 1)
val2 = _IEEE80211_MASKSHIFT(ni->ni_vhtcap,
IEEE80211_VHTCAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK);
val = MIN(val1, val2);
new_vhtcap |= _IEEE80211_SHIFTMASK(val,
IEEE80211_VHTCAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK);
/*
* Link adaptation is only valid if HTC-VHT capable is 1.
* Otherwise, always set it to 0.
*/
val2 = val1 = _IEEE80211_MASKSHIFT(vap->iv_vhtcaps,
IEEE80211_VHTCAP_VHT_LINK_ADAPTATION_VHT_MASK);
if (opmode == 1)
val2 = _IEEE80211_MASKSHIFT(ni->ni_vhtcap,
IEEE80211_VHTCAP_VHT_LINK_ADAPTATION_VHT_MASK);
val = MIN(val1, val2);
if ((new_vhtcap & IEEE80211_VHTCAP_HTC_VHT) == 0)
val = 0;
new_vhtcap |= _IEEE80211_SHIFTMASK(val,
IEEE80211_VHTCAP_VHT_LINK_ADAPTATION_VHT_MASK);
/*
* The following two options are 0 if the pattern may change, 1 if it
* does not change. So, downgrade to the higher value.
*/
/* RX antenna pattern */
val2 = val1 = _IEEE80211_MASKSHIFT(vap->iv_vhtcaps,
IEEE80211_VHTCAP_RX_ANTENNA_PATTERN);
if (opmode == 1)
val2 = _IEEE80211_MASKSHIFT(ni->ni_vhtcap,
IEEE80211_VHTCAP_RX_ANTENNA_PATTERN);
val = MAX(val1, val2);
new_vhtcap |= _IEEE80211_SHIFTMASK(val,
IEEE80211_VHTCAP_RX_ANTENNA_PATTERN);
/* TX antenna pattern */
val2 = val1 = _IEEE80211_MASKSHIFT(vap->iv_vhtcaps,
IEEE80211_VHTCAP_TX_ANTENNA_PATTERN);
if (opmode == 1)
val2 = _IEEE80211_MASKSHIFT(ni->ni_vhtcap,
IEEE80211_VHTCAP_TX_ANTENNA_PATTERN);
val = MAX(val1, val2);
new_vhtcap |= _IEEE80211_SHIFTMASK(val,
IEEE80211_VHTCAP_TX_ANTENNA_PATTERN);
/*
* MCS set - again, we announce what we want to use
* based on configuration, device capabilities and
* already-learnt vhtcap/vhtinfo IE information.
*/
/* MCS set - start with whatever the device supports */
vhtcap->supp_mcs.rx_mcs_map = vap->iv_vht_mcsinfo.rx_mcs_map;
vhtcap->supp_mcs.rx_highest = 0;
vhtcap->supp_mcs.tx_mcs_map = vap->iv_vht_mcsinfo.tx_mcs_map;
vhtcap->supp_mcs.tx_highest = 0;
vhtcap->vht_cap_info = new_vhtcap;
/*
* Now, if we're a STA, mask off whatever the AP doesn't support.
* Ie, we continue to state we can receive whatever we can do,
* but we only announce that we will transmit rates that meet
* the AP requirement.
*
* Note: 0 - MCS0..7; 1 - MCS0..8; 2 - MCS0..9; 3 = not supported.
* We can't just use MIN() because '3' means "no", so special case it.
*/
if (opmode) {
for (i = 0; i < 8; i++) {
val1 = (vhtcap->supp_mcs.tx_mcs_map >> (i*2)) & 0x3;
val2 = (ni->ni_vht_mcsinfo.tx_mcs_map >> (i*2)) & 0x3;
val = MIN(val1, val2);
if (val1 == 3 || val2 == 3)
val = 3;
vhtcap->supp_mcs.tx_mcs_map &= ~(0x3 << (i*2));
vhtcap->supp_mcs.tx_mcs_map |= (val << (i*2));
}
}
}
/*
* Add a VHTCAP field.
*
* If in station mode, we announce what we would like our
* desired configuration to be.
*
* Else, we announce our capabilities based on our current
* configuration.
*/
uint8_t *
ieee80211_add_vhtcap(uint8_t *frm, struct ieee80211_node *ni)
{
struct ieee80211_ie_vhtcap vhtcap;
int opmode;
opmode = 0;
if (ni->ni_vap->iv_opmode == IEEE80211_M_STA)
opmode = 1;
ieee80211_vht_get_vhtcap_ie(ni, &vhtcap, opmode);
memset(frm, '\0', sizeof(struct ieee80211_ie_vhtcap));
frm[0] = IEEE80211_ELEMID_VHT_CAP;
frm[1] = sizeof(struct ieee80211_ie_vhtcap) - 2;
frm += 2;
/* 32-bit VHT capability */
ADDWORD(frm, vhtcap.vht_cap_info);
/* suppmcs */
ADDSHORT(frm, vhtcap.supp_mcs.rx_mcs_map);
ADDSHORT(frm, vhtcap.supp_mcs.rx_highest);
ADDSHORT(frm, vhtcap.supp_mcs.tx_mcs_map);
ADDSHORT(frm, vhtcap.supp_mcs.tx_highest);
return (frm);
}
static uint8_t
ieee80211_vht_get_chwidth_ie(struct ieee80211_channel *c)
{
/*
* XXX TODO: look at the node configuration as
* well?
*/
if (IEEE80211_IS_CHAN_VHT80P80(c))
return IEEE80211_VHT_CHANWIDTH_80P80MHZ;
if (IEEE80211_IS_CHAN_VHT160(c))
return IEEE80211_VHT_CHANWIDTH_160MHZ;
if (IEEE80211_IS_CHAN_VHT80(c))
return IEEE80211_VHT_CHANWIDTH_80MHZ;
if (IEEE80211_IS_CHAN_VHT40(c))
return IEEE80211_VHT_CHANWIDTH_USE_HT;
if (IEEE80211_IS_CHAN_VHT20(c))
return IEEE80211_VHT_CHANWIDTH_USE_HT;
/* We shouldn't get here */
printf("%s: called on a non-VHT channel (freq=%d, flags=0x%08x\n",
__func__, (int) c->ic_freq, c->ic_flags);
return IEEE80211_VHT_CHANWIDTH_USE_HT;
}
/*
* Note: this just uses the current channel information;
* it doesn't use the node info after parsing.
*
* XXX TODO: need to make the basic MCS set configurable.
* XXX TODO: read 802.11-2013 to determine what to set
* chwidth to when scanning. I have a feeling
* it isn't involved in scanning and we shouldn't
* be sending it; and I don't yet know what to set
* it to for IBSS or hostap where the peer may be
* a completely different channel width to us.
*/
uint8_t *
ieee80211_add_vhtinfo(uint8_t *frm, struct ieee80211_node *ni)
{
memset(frm, '\0', sizeof(struct ieee80211_ie_vht_operation));
frm[0] = IEEE80211_ELEMID_VHT_OPMODE;
frm[1] = sizeof(struct ieee80211_ie_vht_operation) - 2;
frm += 2;
/* 8-bit chanwidth */
*frm++ = ieee80211_vht_get_chwidth_ie(ni->ni_chan);
/* 8-bit freq1 */
*frm++ = ni->ni_chan->ic_vht_ch_freq1;
/* 8-bit freq2 */
*frm++ = ni->ni_chan->ic_vht_ch_freq2;
/* 16-bit basic MCS set - just MCS0..7 for NSS=1 for now */
ADDSHORT(frm, 0xfffc);
return (frm);
}
void
ieee80211_vht_update_cap(struct ieee80211_node *ni, const uint8_t *vhtcap_ie,
const uint8_t *vhtop_ie)
{
ieee80211_parse_vhtcap(ni, vhtcap_ie);
ieee80211_parse_vhtopmode(ni, vhtop_ie);
}
static struct ieee80211_channel *
findvhtchan(struct ieee80211com *ic, struct ieee80211_channel *c, int vhtflags)
{
return (ieee80211_find_channel(ic, c->ic_freq,
(c->ic_flags & ~IEEE80211_CHAN_VHT) | vhtflags));
}
/*
* Handle channel promotion to VHT, similar to ieee80211_ht_adjust_channel().
*/
struct ieee80211_channel *
ieee80211_vht_adjust_channel(struct ieee80211com *ic,
struct ieee80211_channel *chan, int flags)
{
struct ieee80211_channel *c;
/* First case - handle channel demotion - if VHT isn't set */
if ((flags & IEEE80211_FVHT_MASK) == 0) {
#if 0
printf("%s: demoting channel %d/0x%08x\n", __func__,
chan->ic_ieee, chan->ic_flags);
#endif
c = ieee80211_find_channel(ic, chan->ic_freq,
chan->ic_flags & ~IEEE80211_CHAN_VHT);
if (c == NULL)
c = chan;
#if 0
printf("%s: .. to %d/0x%08x\n", __func__,
c->ic_ieee, c->ic_flags);
#endif
return (c);
}
/*
* We can upgrade to VHT - attempt to do so
*
* Note: we don't clear the HT flags, these are the hints
* for HT40U/HT40D when selecting VHT40 or larger channels.
*/
c = NULL;
if ((c == NULL) && (flags & IEEE80211_FVHT_USEVHT160))
c = findvhtchan(ic, chan, IEEE80211_CHAN_VHT160);
if ((c == NULL) && (flags & IEEE80211_FVHT_USEVHT80P80))
c = findvhtchan(ic, chan, IEEE80211_CHAN_VHT80P80);
if ((c == NULL) && (flags & IEEE80211_FVHT_USEVHT80))
c = findvhtchan(ic, chan, IEEE80211_CHAN_VHT80);
if ((c == NULL) && (flags & IEEE80211_FVHT_USEVHT40))
c = findvhtchan(ic, chan, IEEE80211_CHAN_VHT40U);
if ((c == NULL) && (flags & IEEE80211_FVHT_USEVHT40))
c = findvhtchan(ic, chan, IEEE80211_CHAN_VHT40D);
/*
* If we get here, VHT20 is always possible because we checked
* for IEEE80211_FVHT_VHT above.
*/
if (c == NULL)
c = findvhtchan(ic, chan, IEEE80211_CHAN_VHT20);
if (c != NULL)
chan = c;
#if 0
printf("%s: selected %d/0x%08x\n", __func__, c->ic_ieee, c->ic_flags);
#endif
return (chan);
}
/*
* Calculate the VHT operation IE for a given node.
*
* This includes calculating the suitable channel width/parameters
* and basic MCS set.
*
* TODO: ensure I read 9.7.11 Rate Selection for VHT STAs.
* TODO: ensure I read 10.39.7 - BSS Basic VHT-MCS and NSS set operation.
*/
void
ieee80211_vht_get_vhtinfo_ie(struct ieee80211_node *ni,
struct ieee80211_ie_vht_operation *vhtop, int opmode)
{
printf("%s: called; TODO!\n", __func__);
}
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