linux/net/mac80211/chan.c
Mordechay Goodstein d6c375095a mac80211: handle rate control (RC) racing with chanctx definition
chanctx represents the current phy configuration and rate scale uses
it for achieving max throughput, so if phy changes bandwidth to narrow
bandwidth, RC should be _first_ updated to avoid using the wider bandwidth
before updating the phy, and vice versa.

We assume in the patch that station interface is always updated before
updating phy context by calling ieee80211_vif_update_chandef.

Signed-off-by: Mordechay Goodstein <mordechay.goodstein@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Link: https://lore.kernel.org/r/iwlwifi.20210618133832.fc4e24496aa2.Ic40ea947c2f65739ea4b5fe3babd0a544240ced6@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2021-06-23 11:29:14 +02:00

1905 lines
48 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/*
* mac80211 - channel management
* Copyright 2020 - 2021 Intel Corporation
*/
#include <linux/nl80211.h>
#include <linux/export.h>
#include <linux/rtnetlink.h>
#include <net/cfg80211.h>
#include "ieee80211_i.h"
#include "driver-ops.h"
#include "rate.h"
static int ieee80211_chanctx_num_assigned(struct ieee80211_local *local,
struct ieee80211_chanctx *ctx)
{
struct ieee80211_sub_if_data *sdata;
int num = 0;
lockdep_assert_held(&local->chanctx_mtx);
list_for_each_entry(sdata, &ctx->assigned_vifs, assigned_chanctx_list)
num++;
return num;
}
static int ieee80211_chanctx_num_reserved(struct ieee80211_local *local,
struct ieee80211_chanctx *ctx)
{
struct ieee80211_sub_if_data *sdata;
int num = 0;
lockdep_assert_held(&local->chanctx_mtx);
list_for_each_entry(sdata, &ctx->reserved_vifs, reserved_chanctx_list)
num++;
return num;
}
int ieee80211_chanctx_refcount(struct ieee80211_local *local,
struct ieee80211_chanctx *ctx)
{
return ieee80211_chanctx_num_assigned(local, ctx) +
ieee80211_chanctx_num_reserved(local, ctx);
}
static int ieee80211_num_chanctx(struct ieee80211_local *local)
{
struct ieee80211_chanctx *ctx;
int num = 0;
lockdep_assert_held(&local->chanctx_mtx);
list_for_each_entry(ctx, &local->chanctx_list, list)
num++;
return num;
}
static bool ieee80211_can_create_new_chanctx(struct ieee80211_local *local)
{
lockdep_assert_held(&local->chanctx_mtx);
return ieee80211_num_chanctx(local) < ieee80211_max_num_channels(local);
}
static struct ieee80211_chanctx *
ieee80211_vif_get_chanctx(struct ieee80211_sub_if_data *sdata)
{
struct ieee80211_local *local __maybe_unused = sdata->local;
struct ieee80211_chanctx_conf *conf;
conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
lockdep_is_held(&local->chanctx_mtx));
if (!conf)
return NULL;
return container_of(conf, struct ieee80211_chanctx, conf);
}
static const struct cfg80211_chan_def *
ieee80211_chanctx_reserved_chandef(struct ieee80211_local *local,
struct ieee80211_chanctx *ctx,
const struct cfg80211_chan_def *compat)
{
struct ieee80211_sub_if_data *sdata;
lockdep_assert_held(&local->chanctx_mtx);
list_for_each_entry(sdata, &ctx->reserved_vifs,
reserved_chanctx_list) {
if (!compat)
compat = &sdata->reserved_chandef;
compat = cfg80211_chandef_compatible(&sdata->reserved_chandef,
compat);
if (!compat)
break;
}
return compat;
}
static const struct cfg80211_chan_def *
ieee80211_chanctx_non_reserved_chandef(struct ieee80211_local *local,
struct ieee80211_chanctx *ctx,
const struct cfg80211_chan_def *compat)
{
struct ieee80211_sub_if_data *sdata;
lockdep_assert_held(&local->chanctx_mtx);
list_for_each_entry(sdata, &ctx->assigned_vifs,
assigned_chanctx_list) {
if (sdata->reserved_chanctx != NULL)
continue;
if (!compat)
compat = &sdata->vif.bss_conf.chandef;
compat = cfg80211_chandef_compatible(
&sdata->vif.bss_conf.chandef, compat);
if (!compat)
break;
}
return compat;
}
static const struct cfg80211_chan_def *
ieee80211_chanctx_combined_chandef(struct ieee80211_local *local,
struct ieee80211_chanctx *ctx,
const struct cfg80211_chan_def *compat)
{
lockdep_assert_held(&local->chanctx_mtx);
compat = ieee80211_chanctx_reserved_chandef(local, ctx, compat);
if (!compat)
return NULL;
compat = ieee80211_chanctx_non_reserved_chandef(local, ctx, compat);
if (!compat)
return NULL;
return compat;
}
static bool
ieee80211_chanctx_can_reserve_chandef(struct ieee80211_local *local,
struct ieee80211_chanctx *ctx,
const struct cfg80211_chan_def *def)
{
lockdep_assert_held(&local->chanctx_mtx);
if (ieee80211_chanctx_combined_chandef(local, ctx, def))
return true;
if (!list_empty(&ctx->reserved_vifs) &&
ieee80211_chanctx_reserved_chandef(local, ctx, def))
return true;
return false;
}
static struct ieee80211_chanctx *
ieee80211_find_reservation_chanctx(struct ieee80211_local *local,
const struct cfg80211_chan_def *chandef,
enum ieee80211_chanctx_mode mode)
{
struct ieee80211_chanctx *ctx;
lockdep_assert_held(&local->chanctx_mtx);
if (mode == IEEE80211_CHANCTX_EXCLUSIVE)
return NULL;
list_for_each_entry(ctx, &local->chanctx_list, list) {
if (ctx->replace_state == IEEE80211_CHANCTX_WILL_BE_REPLACED)
continue;
if (ctx->mode == IEEE80211_CHANCTX_EXCLUSIVE)
continue;
if (!ieee80211_chanctx_can_reserve_chandef(local, ctx,
chandef))
continue;
return ctx;
}
return NULL;
}
static enum nl80211_chan_width ieee80211_get_sta_bw(struct sta_info *sta)
{
enum ieee80211_sta_rx_bandwidth width = ieee80211_sta_cap_rx_bw(sta);
switch (width) {
case IEEE80211_STA_RX_BW_20:
if (sta->sta.ht_cap.ht_supported)
return NL80211_CHAN_WIDTH_20;
else
return NL80211_CHAN_WIDTH_20_NOHT;
case IEEE80211_STA_RX_BW_40:
return NL80211_CHAN_WIDTH_40;
case IEEE80211_STA_RX_BW_80:
return NL80211_CHAN_WIDTH_80;
case IEEE80211_STA_RX_BW_160:
/*
* This applied for both 160 and 80+80. since we use
* the returned value to consider degradation of
* ctx->conf.min_def, we have to make sure to take
* the bigger one (NL80211_CHAN_WIDTH_160).
* Otherwise we might try degrading even when not
* needed, as the max required sta_bw returned (80+80)
* might be smaller than the configured bw (160).
*/
return NL80211_CHAN_WIDTH_160;
default:
WARN_ON(1);
return NL80211_CHAN_WIDTH_20;
}
}
static enum nl80211_chan_width
ieee80211_get_max_required_bw(struct ieee80211_sub_if_data *sdata)
{
enum nl80211_chan_width max_bw = NL80211_CHAN_WIDTH_20_NOHT;
struct sta_info *sta;
rcu_read_lock();
list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) {
if (sdata != sta->sdata &&
!(sta->sdata->bss && sta->sdata->bss == sdata->bss))
continue;
max_bw = max(max_bw, ieee80211_get_sta_bw(sta));
}
rcu_read_unlock();
return max_bw;
}
static enum nl80211_chan_width
ieee80211_get_chanctx_max_required_bw(struct ieee80211_local *local,
struct ieee80211_chanctx_conf *conf)
{
struct ieee80211_sub_if_data *sdata;
enum nl80211_chan_width max_bw = NL80211_CHAN_WIDTH_20_NOHT;
rcu_read_lock();
list_for_each_entry_rcu(sdata, &local->interfaces, list) {
struct ieee80211_vif *vif = &sdata->vif;
enum nl80211_chan_width width = NL80211_CHAN_WIDTH_20_NOHT;
if (!ieee80211_sdata_running(sdata))
continue;
if (rcu_access_pointer(sdata->vif.chanctx_conf) != conf)
continue;
switch (vif->type) {
case NL80211_IFTYPE_AP:
case NL80211_IFTYPE_AP_VLAN:
width = ieee80211_get_max_required_bw(sdata);
break;
case NL80211_IFTYPE_STATION:
/*
* The ap's sta->bandwidth is not set yet at this
* point, so take the width from the chandef, but
* account also for TDLS peers
*/
width = max(vif->bss_conf.chandef.width,
ieee80211_get_max_required_bw(sdata));
break;
case NL80211_IFTYPE_P2P_DEVICE:
case NL80211_IFTYPE_NAN:
continue;
case NL80211_IFTYPE_ADHOC:
case NL80211_IFTYPE_MESH_POINT:
case NL80211_IFTYPE_OCB:
width = vif->bss_conf.chandef.width;
break;
case NL80211_IFTYPE_WDS:
case NL80211_IFTYPE_UNSPECIFIED:
case NUM_NL80211_IFTYPES:
case NL80211_IFTYPE_MONITOR:
case NL80211_IFTYPE_P2P_CLIENT:
case NL80211_IFTYPE_P2P_GO:
WARN_ON_ONCE(1);
}
max_bw = max(max_bw, width);
}
/* use the configured bandwidth in case of monitor interface */
sdata = rcu_dereference(local->monitor_sdata);
if (sdata && rcu_access_pointer(sdata->vif.chanctx_conf) == conf)
max_bw = max(max_bw, conf->def.width);
rcu_read_unlock();
return max_bw;
}
/*
* recalc the min required chan width of the channel context, which is
* the max of min required widths of all the interfaces bound to this
* channel context.
*/
static u32 _ieee80211_recalc_chanctx_min_def(struct ieee80211_local *local,
struct ieee80211_chanctx *ctx)
{
enum nl80211_chan_width max_bw;
struct cfg80211_chan_def min_def;
lockdep_assert_held(&local->chanctx_mtx);
/* don't optimize non-20MHz based and radar_enabled confs */
if (ctx->conf.def.width == NL80211_CHAN_WIDTH_5 ||
ctx->conf.def.width == NL80211_CHAN_WIDTH_10 ||
ctx->conf.def.width == NL80211_CHAN_WIDTH_1 ||
ctx->conf.def.width == NL80211_CHAN_WIDTH_2 ||
ctx->conf.def.width == NL80211_CHAN_WIDTH_4 ||
ctx->conf.def.width == NL80211_CHAN_WIDTH_8 ||
ctx->conf.def.width == NL80211_CHAN_WIDTH_16 ||
ctx->conf.radar_enabled) {
ctx->conf.min_def = ctx->conf.def;
return 0;
}
max_bw = ieee80211_get_chanctx_max_required_bw(local, &ctx->conf);
/* downgrade chandef up to max_bw */
min_def = ctx->conf.def;
while (min_def.width > max_bw)
ieee80211_chandef_downgrade(&min_def);
if (cfg80211_chandef_identical(&ctx->conf.min_def, &min_def))
return 0;
ctx->conf.min_def = min_def;
if (!ctx->driver_present)
return 0;
return IEEE80211_CHANCTX_CHANGE_MIN_WIDTH;
}
/* calling this function is assuming that station vif is updated to
* lates changes by calling ieee80211_vif_update_chandef
*/
static void ieee80211_chan_bw_change(struct ieee80211_local *local,
struct ieee80211_chanctx *ctx,
bool narrowed)
{
struct sta_info *sta;
struct ieee80211_supported_band *sband =
local->hw.wiphy->bands[ctx->conf.def.chan->band];
rcu_read_lock();
list_for_each_entry_rcu(sta, &local->sta_list,
list) {
enum ieee80211_sta_rx_bandwidth new_sta_bw;
if (!ieee80211_sdata_running(sta->sdata))
continue;
if (rcu_access_pointer(sta->sdata->vif.chanctx_conf) !=
&ctx->conf)
continue;
new_sta_bw = ieee80211_sta_cur_vht_bw(sta);
/* nothing change */
if (new_sta_bw == sta->sta.bandwidth)
continue;
/* vif changed to narrow BW and narrow BW for station wasn't
* requested or vise versa */
if ((new_sta_bw < sta->sta.bandwidth) == !narrowed)
continue;
sta->sta.bandwidth = new_sta_bw;
rate_control_rate_update(local, sband, sta,
IEEE80211_RC_BW_CHANGED);
}
rcu_read_unlock();
}
/*
* recalc the min required chan width of the channel context, which is
* the max of min required widths of all the interfaces bound to this
* channel context.
*/
void ieee80211_recalc_chanctx_min_def(struct ieee80211_local *local,
struct ieee80211_chanctx *ctx)
{
u32 changed = _ieee80211_recalc_chanctx_min_def(local, ctx);
if (!changed)
return;
/* check is BW narrowed */
ieee80211_chan_bw_change(local, ctx, true);
drv_change_chanctx(local, ctx, changed);
/* check is BW wider */
ieee80211_chan_bw_change(local, ctx, false);
}
static void ieee80211_change_chanctx(struct ieee80211_local *local,
struct ieee80211_chanctx *ctx,
struct ieee80211_chanctx *old_ctx,
const struct cfg80211_chan_def *chandef)
{
u32 changed;
/* expected to handle only 20/40/80/160 channel widths */
switch (chandef->width) {
case NL80211_CHAN_WIDTH_20_NOHT:
case NL80211_CHAN_WIDTH_20:
case NL80211_CHAN_WIDTH_40:
case NL80211_CHAN_WIDTH_80:
case NL80211_CHAN_WIDTH_80P80:
case NL80211_CHAN_WIDTH_160:
break;
default:
WARN_ON(1);
}
/* Check maybe BW narrowed - we do this _before_ calling recalc_chanctx_min_def
* due to maybe not returning from it, e.g in case new context was added
* first time with all parameters up to date.
*/
ieee80211_chan_bw_change(local, old_ctx, true);
if (cfg80211_chandef_identical(&ctx->conf.def, chandef)) {
ieee80211_recalc_chanctx_min_def(local, ctx);
return;
}
WARN_ON(!cfg80211_chandef_compatible(&ctx->conf.def, chandef));
ctx->conf.def = *chandef;
/* check if min chanctx also changed */
changed = IEEE80211_CHANCTX_CHANGE_WIDTH |
_ieee80211_recalc_chanctx_min_def(local, ctx);
drv_change_chanctx(local, ctx, changed);
if (!local->use_chanctx) {
local->_oper_chandef = *chandef;
ieee80211_hw_config(local, 0);
}
/* check is BW wider */
ieee80211_chan_bw_change(local, old_ctx, false);
}
static struct ieee80211_chanctx *
ieee80211_find_chanctx(struct ieee80211_local *local,
const struct cfg80211_chan_def *chandef,
enum ieee80211_chanctx_mode mode)
{
struct ieee80211_chanctx *ctx;
lockdep_assert_held(&local->chanctx_mtx);
if (mode == IEEE80211_CHANCTX_EXCLUSIVE)
return NULL;
list_for_each_entry(ctx, &local->chanctx_list, list) {
const struct cfg80211_chan_def *compat;
if (ctx->replace_state != IEEE80211_CHANCTX_REPLACE_NONE)
continue;
if (ctx->mode == IEEE80211_CHANCTX_EXCLUSIVE)
continue;
compat = cfg80211_chandef_compatible(&ctx->conf.def, chandef);
if (!compat)
continue;
compat = ieee80211_chanctx_reserved_chandef(local, ctx,
compat);
if (!compat)
continue;
ieee80211_change_chanctx(local, ctx, ctx, compat);
return ctx;
}
return NULL;
}
bool ieee80211_is_radar_required(struct ieee80211_local *local)
{
struct ieee80211_sub_if_data *sdata;
lockdep_assert_held(&local->mtx);
rcu_read_lock();
list_for_each_entry_rcu(sdata, &local->interfaces, list) {
if (sdata->radar_required) {
rcu_read_unlock();
return true;
}
}
rcu_read_unlock();
return false;
}
static bool
ieee80211_chanctx_radar_required(struct ieee80211_local *local,
struct ieee80211_chanctx *ctx)
{
struct ieee80211_chanctx_conf *conf = &ctx->conf;
struct ieee80211_sub_if_data *sdata;
bool required = false;
lockdep_assert_held(&local->chanctx_mtx);
lockdep_assert_held(&local->mtx);
rcu_read_lock();
list_for_each_entry_rcu(sdata, &local->interfaces, list) {
if (!ieee80211_sdata_running(sdata))
continue;
if (rcu_access_pointer(sdata->vif.chanctx_conf) != conf)
continue;
if (!sdata->radar_required)
continue;
required = true;
break;
}
rcu_read_unlock();
return required;
}
static struct ieee80211_chanctx *
ieee80211_alloc_chanctx(struct ieee80211_local *local,
const struct cfg80211_chan_def *chandef,
enum ieee80211_chanctx_mode mode)
{
struct ieee80211_chanctx *ctx;
lockdep_assert_held(&local->chanctx_mtx);
ctx = kzalloc(sizeof(*ctx) + local->hw.chanctx_data_size, GFP_KERNEL);
if (!ctx)
return NULL;
INIT_LIST_HEAD(&ctx->assigned_vifs);
INIT_LIST_HEAD(&ctx->reserved_vifs);
ctx->conf.def = *chandef;
ctx->conf.rx_chains_static = 1;
ctx->conf.rx_chains_dynamic = 1;
ctx->mode = mode;
ctx->conf.radar_enabled = false;
ieee80211_recalc_chanctx_min_def(local, ctx);
return ctx;
}
static int ieee80211_add_chanctx(struct ieee80211_local *local,
struct ieee80211_chanctx *ctx)
{
u32 changed;
int err;
lockdep_assert_held(&local->mtx);
lockdep_assert_held(&local->chanctx_mtx);
if (!local->use_chanctx)
local->hw.conf.radar_enabled = ctx->conf.radar_enabled;
/* turn idle off *before* setting channel -- some drivers need that */
changed = ieee80211_idle_off(local);
if (changed)
ieee80211_hw_config(local, changed);
if (!local->use_chanctx) {
local->_oper_chandef = ctx->conf.def;
ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
} else {
err = drv_add_chanctx(local, ctx);
if (err) {
ieee80211_recalc_idle(local);
return err;
}
}
return 0;
}
static struct ieee80211_chanctx *
ieee80211_new_chanctx(struct ieee80211_local *local,
const struct cfg80211_chan_def *chandef,
enum ieee80211_chanctx_mode mode)
{
struct ieee80211_chanctx *ctx;
int err;
lockdep_assert_held(&local->mtx);
lockdep_assert_held(&local->chanctx_mtx);
ctx = ieee80211_alloc_chanctx(local, chandef, mode);
if (!ctx)
return ERR_PTR(-ENOMEM);
err = ieee80211_add_chanctx(local, ctx);
if (err) {
kfree(ctx);
return ERR_PTR(err);
}
list_add_rcu(&ctx->list, &local->chanctx_list);
return ctx;
}
static void ieee80211_del_chanctx(struct ieee80211_local *local,
struct ieee80211_chanctx *ctx)
{
lockdep_assert_held(&local->chanctx_mtx);
if (!local->use_chanctx) {
struct cfg80211_chan_def *chandef = &local->_oper_chandef;
/* S1G doesn't have 20MHz, so get the correct width for the
* current channel.
*/
if (chandef->chan->band == NL80211_BAND_S1GHZ)
chandef->width =
ieee80211_s1g_channel_width(chandef->chan);
else
chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
chandef->center_freq1 = chandef->chan->center_freq;
chandef->freq1_offset = chandef->chan->freq_offset;
chandef->center_freq2 = 0;
/* NOTE: Disabling radar is only valid here for
* single channel context. To be sure, check it ...
*/
WARN_ON(local->hw.conf.radar_enabled &&
!list_empty(&local->chanctx_list));
local->hw.conf.radar_enabled = false;
ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
} else {
drv_remove_chanctx(local, ctx);
}
ieee80211_recalc_idle(local);
}
static void ieee80211_free_chanctx(struct ieee80211_local *local,
struct ieee80211_chanctx *ctx)
{
lockdep_assert_held(&local->chanctx_mtx);
WARN_ON_ONCE(ieee80211_chanctx_refcount(local, ctx) != 0);
list_del_rcu(&ctx->list);
ieee80211_del_chanctx(local, ctx);
kfree_rcu(ctx, rcu_head);
}
void ieee80211_recalc_chanctx_chantype(struct ieee80211_local *local,
struct ieee80211_chanctx *ctx)
{
struct ieee80211_chanctx_conf *conf = &ctx->conf;
struct ieee80211_sub_if_data *sdata;
const struct cfg80211_chan_def *compat = NULL;
struct sta_info *sta;
lockdep_assert_held(&local->chanctx_mtx);
rcu_read_lock();
list_for_each_entry_rcu(sdata, &local->interfaces, list) {
if (!ieee80211_sdata_running(sdata))
continue;
if (rcu_access_pointer(sdata->vif.chanctx_conf) != conf)
continue;
if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
continue;
if (!compat)
compat = &sdata->vif.bss_conf.chandef;
compat = cfg80211_chandef_compatible(
&sdata->vif.bss_conf.chandef, compat);
if (WARN_ON_ONCE(!compat))
break;
}
/* TDLS peers can sometimes affect the chandef width */
list_for_each_entry_rcu(sta, &local->sta_list, list) {
if (!sta->uploaded ||
!test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW) ||
!test_sta_flag(sta, WLAN_STA_AUTHORIZED) ||
!sta->tdls_chandef.chan)
continue;
compat = cfg80211_chandef_compatible(&sta->tdls_chandef,
compat);
if (WARN_ON_ONCE(!compat))
break;
}
rcu_read_unlock();
if (!compat)
return;
ieee80211_change_chanctx(local, ctx, ctx, compat);
}
static void ieee80211_recalc_radar_chanctx(struct ieee80211_local *local,
struct ieee80211_chanctx *chanctx)
{
bool radar_enabled;
lockdep_assert_held(&local->chanctx_mtx);
/* for ieee80211_is_radar_required */
lockdep_assert_held(&local->mtx);
radar_enabled = ieee80211_chanctx_radar_required(local, chanctx);
if (radar_enabled == chanctx->conf.radar_enabled)
return;
chanctx->conf.radar_enabled = radar_enabled;
if (!local->use_chanctx) {
local->hw.conf.radar_enabled = chanctx->conf.radar_enabled;
ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
}
drv_change_chanctx(local, chanctx, IEEE80211_CHANCTX_CHANGE_RADAR);
}
static int ieee80211_assign_vif_chanctx(struct ieee80211_sub_if_data *sdata,
struct ieee80211_chanctx *new_ctx)
{
struct ieee80211_local *local = sdata->local;
struct ieee80211_chanctx_conf *conf;
struct ieee80211_chanctx *curr_ctx = NULL;
int ret = 0;
if (WARN_ON(sdata->vif.type == NL80211_IFTYPE_NAN))
return -ENOTSUPP;
conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
lockdep_is_held(&local->chanctx_mtx));
if (conf) {
curr_ctx = container_of(conf, struct ieee80211_chanctx, conf);
drv_unassign_vif_chanctx(local, sdata, curr_ctx);
conf = NULL;
list_del(&sdata->assigned_chanctx_list);
}
if (new_ctx) {
ret = drv_assign_vif_chanctx(local, sdata, new_ctx);
if (ret)
goto out;
conf = &new_ctx->conf;
list_add(&sdata->assigned_chanctx_list,
&new_ctx->assigned_vifs);
}
out:
rcu_assign_pointer(sdata->vif.chanctx_conf, conf);
sdata->vif.bss_conf.idle = !conf;
if (curr_ctx && ieee80211_chanctx_num_assigned(local, curr_ctx) > 0) {
ieee80211_recalc_chanctx_chantype(local, curr_ctx);
ieee80211_recalc_smps_chanctx(local, curr_ctx);
ieee80211_recalc_radar_chanctx(local, curr_ctx);
ieee80211_recalc_chanctx_min_def(local, curr_ctx);
}
if (new_ctx && ieee80211_chanctx_num_assigned(local, new_ctx) > 0) {
ieee80211_recalc_txpower(sdata, false);
ieee80211_recalc_chanctx_min_def(local, new_ctx);
}
if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE &&
sdata->vif.type != NL80211_IFTYPE_MONITOR)
ieee80211_bss_info_change_notify(sdata,
BSS_CHANGED_IDLE);
ieee80211_check_fast_xmit_iface(sdata);
return ret;
}
void ieee80211_recalc_smps_chanctx(struct ieee80211_local *local,
struct ieee80211_chanctx *chanctx)
{
struct ieee80211_sub_if_data *sdata;
u8 rx_chains_static, rx_chains_dynamic;
lockdep_assert_held(&local->chanctx_mtx);
rx_chains_static = 1;
rx_chains_dynamic = 1;
rcu_read_lock();
list_for_each_entry_rcu(sdata, &local->interfaces, list) {
u8 needed_static, needed_dynamic;
if (!ieee80211_sdata_running(sdata))
continue;
if (rcu_access_pointer(sdata->vif.chanctx_conf) !=
&chanctx->conf)
continue;
switch (sdata->vif.type) {
case NL80211_IFTYPE_P2P_DEVICE:
case NL80211_IFTYPE_NAN:
continue;
case NL80211_IFTYPE_STATION:
if (!sdata->u.mgd.associated)
continue;
break;
case NL80211_IFTYPE_AP_VLAN:
continue;
case NL80211_IFTYPE_AP:
case NL80211_IFTYPE_ADHOC:
case NL80211_IFTYPE_MESH_POINT:
case NL80211_IFTYPE_OCB:
break;
default:
WARN_ON_ONCE(1);
}
switch (sdata->smps_mode) {
default:
WARN_ONCE(1, "Invalid SMPS mode %d\n",
sdata->smps_mode);
fallthrough;
case IEEE80211_SMPS_OFF:
needed_static = sdata->needed_rx_chains;
needed_dynamic = sdata->needed_rx_chains;
break;
case IEEE80211_SMPS_DYNAMIC:
needed_static = 1;
needed_dynamic = sdata->needed_rx_chains;
break;
case IEEE80211_SMPS_STATIC:
needed_static = 1;
needed_dynamic = 1;
break;
}
rx_chains_static = max(rx_chains_static, needed_static);
rx_chains_dynamic = max(rx_chains_dynamic, needed_dynamic);
}
/* Disable SMPS for the monitor interface */
sdata = rcu_dereference(local->monitor_sdata);
if (sdata &&
rcu_access_pointer(sdata->vif.chanctx_conf) == &chanctx->conf)
rx_chains_dynamic = rx_chains_static = local->rx_chains;
rcu_read_unlock();
if (!local->use_chanctx) {
if (rx_chains_static > 1)
local->smps_mode = IEEE80211_SMPS_OFF;
else if (rx_chains_dynamic > 1)
local->smps_mode = IEEE80211_SMPS_DYNAMIC;
else
local->smps_mode = IEEE80211_SMPS_STATIC;
ieee80211_hw_config(local, 0);
}
if (rx_chains_static == chanctx->conf.rx_chains_static &&
rx_chains_dynamic == chanctx->conf.rx_chains_dynamic)
return;
chanctx->conf.rx_chains_static = rx_chains_static;
chanctx->conf.rx_chains_dynamic = rx_chains_dynamic;
drv_change_chanctx(local, chanctx, IEEE80211_CHANCTX_CHANGE_RX_CHAINS);
}
static void
__ieee80211_vif_copy_chanctx_to_vlans(struct ieee80211_sub_if_data *sdata,
bool clear)
{
struct ieee80211_local *local __maybe_unused = sdata->local;
struct ieee80211_sub_if_data *vlan;
struct ieee80211_chanctx_conf *conf;
if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP))
return;
lockdep_assert_held(&local->mtx);
/* Check that conf exists, even when clearing this function
* must be called with the AP's channel context still there
* as it would otherwise cause VLANs to have an invalid
* channel context pointer for a while, possibly pointing
* to a channel context that has already been freed.
*/
conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
lockdep_is_held(&local->chanctx_mtx));
WARN_ON(!conf);
if (clear)
conf = NULL;
list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
rcu_assign_pointer(vlan->vif.chanctx_conf, conf);
}
void ieee80211_vif_copy_chanctx_to_vlans(struct ieee80211_sub_if_data *sdata,
bool clear)
{
struct ieee80211_local *local = sdata->local;
mutex_lock(&local->chanctx_mtx);
__ieee80211_vif_copy_chanctx_to_vlans(sdata, clear);
mutex_unlock(&local->chanctx_mtx);
}
int ieee80211_vif_unreserve_chanctx(struct ieee80211_sub_if_data *sdata)
{
struct ieee80211_chanctx *ctx = sdata->reserved_chanctx;
lockdep_assert_held(&sdata->local->chanctx_mtx);
if (WARN_ON(!ctx))
return -EINVAL;
list_del(&sdata->reserved_chanctx_list);
sdata->reserved_chanctx = NULL;
if (ieee80211_chanctx_refcount(sdata->local, ctx) == 0) {
if (ctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER) {
if (WARN_ON(!ctx->replace_ctx))
return -EINVAL;
WARN_ON(ctx->replace_ctx->replace_state !=
IEEE80211_CHANCTX_WILL_BE_REPLACED);
WARN_ON(ctx->replace_ctx->replace_ctx != ctx);
ctx->replace_ctx->replace_ctx = NULL;
ctx->replace_ctx->replace_state =
IEEE80211_CHANCTX_REPLACE_NONE;
list_del_rcu(&ctx->list);
kfree_rcu(ctx, rcu_head);
} else {
ieee80211_free_chanctx(sdata->local, ctx);
}
}
return 0;
}
int ieee80211_vif_reserve_chanctx(struct ieee80211_sub_if_data *sdata,
const struct cfg80211_chan_def *chandef,
enum ieee80211_chanctx_mode mode,
bool radar_required)
{
struct ieee80211_local *local = sdata->local;
struct ieee80211_chanctx *new_ctx, *curr_ctx, *ctx;
lockdep_assert_held(&local->chanctx_mtx);
curr_ctx = ieee80211_vif_get_chanctx(sdata);
if (curr_ctx && local->use_chanctx && !local->ops->switch_vif_chanctx)
return -ENOTSUPP;
new_ctx = ieee80211_find_reservation_chanctx(local, chandef, mode);
if (!new_ctx) {
if (ieee80211_can_create_new_chanctx(local)) {
new_ctx = ieee80211_new_chanctx(local, chandef, mode);
if (IS_ERR(new_ctx))
return PTR_ERR(new_ctx);
} else {
if (!curr_ctx ||
(curr_ctx->replace_state ==
IEEE80211_CHANCTX_WILL_BE_REPLACED) ||
!list_empty(&curr_ctx->reserved_vifs)) {
/*
* Another vif already requested this context
* for a reservation. Find another one hoping
* all vifs assigned to it will also switch
* soon enough.
*
* TODO: This needs a little more work as some
* cases (more than 2 chanctx capable devices)
* may fail which could otherwise succeed
* provided some channel context juggling was
* performed.
*
* Consider ctx1..3, vif1..6, each ctx has 2
* vifs. vif1 and vif2 from ctx1 request new
* different chandefs starting 2 in-place
* reserations with ctx4 and ctx5 replacing
* ctx1 and ctx2 respectively. Next vif5 and
* vif6 from ctx3 reserve ctx4. If vif3 and
* vif4 remain on ctx2 as they are then this
* fails unless `replace_ctx` from ctx5 is
* replaced with ctx3.
*/
list_for_each_entry(ctx, &local->chanctx_list,
list) {
if (ctx->replace_state !=
IEEE80211_CHANCTX_REPLACE_NONE)
continue;
if (!list_empty(&ctx->reserved_vifs))
continue;
curr_ctx = ctx;
break;
}
}
/*
* If that's true then all available contexts already
* have reservations and cannot be used.
*/
if (!curr_ctx ||
(curr_ctx->replace_state ==
IEEE80211_CHANCTX_WILL_BE_REPLACED) ||
!list_empty(&curr_ctx->reserved_vifs))
return -EBUSY;
new_ctx = ieee80211_alloc_chanctx(local, chandef, mode);
if (!new_ctx)
return -ENOMEM;
new_ctx->replace_ctx = curr_ctx;
new_ctx->replace_state =
IEEE80211_CHANCTX_REPLACES_OTHER;
curr_ctx->replace_ctx = new_ctx;
curr_ctx->replace_state =
IEEE80211_CHANCTX_WILL_BE_REPLACED;
list_add_rcu(&new_ctx->list, &local->chanctx_list);
}
}
list_add(&sdata->reserved_chanctx_list, &new_ctx->reserved_vifs);
sdata->reserved_chanctx = new_ctx;
sdata->reserved_chandef = *chandef;
sdata->reserved_radar_required = radar_required;
sdata->reserved_ready = false;
return 0;
}
static void
ieee80211_vif_chanctx_reservation_complete(struct ieee80211_sub_if_data *sdata)
{
switch (sdata->vif.type) {
case NL80211_IFTYPE_ADHOC:
case NL80211_IFTYPE_AP:
case NL80211_IFTYPE_MESH_POINT:
case NL80211_IFTYPE_OCB:
ieee80211_queue_work(&sdata->local->hw,
&sdata->csa_finalize_work);
break;
case NL80211_IFTYPE_STATION:
ieee80211_queue_work(&sdata->local->hw,
&sdata->u.mgd.chswitch_work);
break;
case NL80211_IFTYPE_UNSPECIFIED:
case NL80211_IFTYPE_AP_VLAN:
case NL80211_IFTYPE_WDS:
case NL80211_IFTYPE_MONITOR:
case NL80211_IFTYPE_P2P_CLIENT:
case NL80211_IFTYPE_P2P_GO:
case NL80211_IFTYPE_P2P_DEVICE:
case NL80211_IFTYPE_NAN:
case NUM_NL80211_IFTYPES:
WARN_ON(1);
break;
}
}
static void
ieee80211_vif_update_chandef(struct ieee80211_sub_if_data *sdata,
const struct cfg80211_chan_def *chandef)
{
struct ieee80211_sub_if_data *vlan;
sdata->vif.bss_conf.chandef = *chandef;
if (sdata->vif.type != NL80211_IFTYPE_AP)
return;
list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
vlan->vif.bss_conf.chandef = *chandef;
}
static int
ieee80211_vif_use_reserved_reassign(struct ieee80211_sub_if_data *sdata)
{
struct ieee80211_local *local = sdata->local;
struct ieee80211_vif_chanctx_switch vif_chsw[1] = {};
struct ieee80211_chanctx *old_ctx, *new_ctx;
const struct cfg80211_chan_def *chandef;
u32 changed = 0;
int err;
lockdep_assert_held(&local->mtx);
lockdep_assert_held(&local->chanctx_mtx);
new_ctx = sdata->reserved_chanctx;
old_ctx = ieee80211_vif_get_chanctx(sdata);
if (WARN_ON(!sdata->reserved_ready))
return -EBUSY;
if (WARN_ON(!new_ctx))
return -EINVAL;
if (WARN_ON(!old_ctx))
return -EINVAL;
if (WARN_ON(new_ctx->replace_state ==
IEEE80211_CHANCTX_REPLACES_OTHER))
return -EINVAL;
chandef = ieee80211_chanctx_non_reserved_chandef(local, new_ctx,
&sdata->reserved_chandef);
if (WARN_ON(!chandef))
return -EINVAL;
if (sdata->vif.bss_conf.chandef.width != sdata->reserved_chandef.width)
changed = BSS_CHANGED_BANDWIDTH;
ieee80211_vif_update_chandef(sdata, &sdata->reserved_chandef);
ieee80211_change_chanctx(local, new_ctx, old_ctx, chandef);
vif_chsw[0].vif = &sdata->vif;
vif_chsw[0].old_ctx = &old_ctx->conf;
vif_chsw[0].new_ctx = &new_ctx->conf;
list_del(&sdata->reserved_chanctx_list);
sdata->reserved_chanctx = NULL;
err = drv_switch_vif_chanctx(local, vif_chsw, 1,
CHANCTX_SWMODE_REASSIGN_VIF);
if (err) {
if (ieee80211_chanctx_refcount(local, new_ctx) == 0)
ieee80211_free_chanctx(local, new_ctx);
goto out;
}
list_move(&sdata->assigned_chanctx_list, &new_ctx->assigned_vifs);
rcu_assign_pointer(sdata->vif.chanctx_conf, &new_ctx->conf);
if (sdata->vif.type == NL80211_IFTYPE_AP)
__ieee80211_vif_copy_chanctx_to_vlans(sdata, false);
ieee80211_check_fast_xmit_iface(sdata);
if (ieee80211_chanctx_refcount(local, old_ctx) == 0)
ieee80211_free_chanctx(local, old_ctx);
ieee80211_recalc_chanctx_min_def(local, new_ctx);
ieee80211_recalc_smps_chanctx(local, new_ctx);
ieee80211_recalc_radar_chanctx(local, new_ctx);
if (changed)
ieee80211_bss_info_change_notify(sdata, changed);
out:
ieee80211_vif_chanctx_reservation_complete(sdata);
return err;
}
static int
ieee80211_vif_use_reserved_assign(struct ieee80211_sub_if_data *sdata)
{
struct ieee80211_local *local = sdata->local;
struct ieee80211_chanctx *old_ctx, *new_ctx;
const struct cfg80211_chan_def *chandef;
int err;
old_ctx = ieee80211_vif_get_chanctx(sdata);
new_ctx = sdata->reserved_chanctx;
if (WARN_ON(!sdata->reserved_ready))
return -EINVAL;
if (WARN_ON(old_ctx))
return -EINVAL;
if (WARN_ON(!new_ctx))
return -EINVAL;
if (WARN_ON(new_ctx->replace_state ==
IEEE80211_CHANCTX_REPLACES_OTHER))
return -EINVAL;
chandef = ieee80211_chanctx_non_reserved_chandef(local, new_ctx,
&sdata->reserved_chandef);
if (WARN_ON(!chandef))
return -EINVAL;
ieee80211_change_chanctx(local, new_ctx, new_ctx, chandef);
list_del(&sdata->reserved_chanctx_list);
sdata->reserved_chanctx = NULL;
err = ieee80211_assign_vif_chanctx(sdata, new_ctx);
if (err) {
if (ieee80211_chanctx_refcount(local, new_ctx) == 0)
ieee80211_free_chanctx(local, new_ctx);
goto out;
}
out:
ieee80211_vif_chanctx_reservation_complete(sdata);
return err;
}
static bool
ieee80211_vif_has_in_place_reservation(struct ieee80211_sub_if_data *sdata)
{
struct ieee80211_chanctx *old_ctx, *new_ctx;
lockdep_assert_held(&sdata->local->chanctx_mtx);
new_ctx = sdata->reserved_chanctx;
old_ctx = ieee80211_vif_get_chanctx(sdata);
if (!old_ctx)
return false;
if (WARN_ON(!new_ctx))
return false;
if (old_ctx->replace_state != IEEE80211_CHANCTX_WILL_BE_REPLACED)
return false;
if (new_ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
return false;
return true;
}
static int ieee80211_chsw_switch_hwconf(struct ieee80211_local *local,
struct ieee80211_chanctx *new_ctx)
{
const struct cfg80211_chan_def *chandef;
lockdep_assert_held(&local->mtx);
lockdep_assert_held(&local->chanctx_mtx);
chandef = ieee80211_chanctx_reserved_chandef(local, new_ctx, NULL);
if (WARN_ON(!chandef))
return -EINVAL;
local->hw.conf.radar_enabled = new_ctx->conf.radar_enabled;
local->_oper_chandef = *chandef;
ieee80211_hw_config(local, 0);
return 0;
}
static int ieee80211_chsw_switch_vifs(struct ieee80211_local *local,
int n_vifs)
{
struct ieee80211_vif_chanctx_switch *vif_chsw;
struct ieee80211_sub_if_data *sdata;
struct ieee80211_chanctx *ctx, *old_ctx;
int i, err;
lockdep_assert_held(&local->mtx);
lockdep_assert_held(&local->chanctx_mtx);
vif_chsw = kcalloc(n_vifs, sizeof(vif_chsw[0]), GFP_KERNEL);
if (!vif_chsw)
return -ENOMEM;
i = 0;
list_for_each_entry(ctx, &local->chanctx_list, list) {
if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
continue;
if (WARN_ON(!ctx->replace_ctx)) {
err = -EINVAL;
goto out;
}
list_for_each_entry(sdata, &ctx->reserved_vifs,
reserved_chanctx_list) {
if (!ieee80211_vif_has_in_place_reservation(
sdata))
continue;
old_ctx = ieee80211_vif_get_chanctx(sdata);
vif_chsw[i].vif = &sdata->vif;
vif_chsw[i].old_ctx = &old_ctx->conf;
vif_chsw[i].new_ctx = &ctx->conf;
i++;
}
}
err = drv_switch_vif_chanctx(local, vif_chsw, n_vifs,
CHANCTX_SWMODE_SWAP_CONTEXTS);
out:
kfree(vif_chsw);
return err;
}
static int ieee80211_chsw_switch_ctxs(struct ieee80211_local *local)
{
struct ieee80211_chanctx *ctx;
int err;
lockdep_assert_held(&local->mtx);
lockdep_assert_held(&local->chanctx_mtx);
list_for_each_entry(ctx, &local->chanctx_list, list) {
if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
continue;
if (!list_empty(&ctx->replace_ctx->assigned_vifs))
continue;
ieee80211_del_chanctx(local, ctx->replace_ctx);
err = ieee80211_add_chanctx(local, ctx);
if (err)
goto err;
}
return 0;
err:
WARN_ON(ieee80211_add_chanctx(local, ctx));
list_for_each_entry_continue_reverse(ctx, &local->chanctx_list, list) {
if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
continue;
if (!list_empty(&ctx->replace_ctx->assigned_vifs))
continue;
ieee80211_del_chanctx(local, ctx);
WARN_ON(ieee80211_add_chanctx(local, ctx->replace_ctx));
}
return err;
}
static int ieee80211_vif_use_reserved_switch(struct ieee80211_local *local)
{
struct ieee80211_sub_if_data *sdata, *sdata_tmp;
struct ieee80211_chanctx *ctx, *ctx_tmp, *old_ctx;
struct ieee80211_chanctx *new_ctx = NULL;
int err, n_assigned, n_reserved, n_ready;
int n_ctx = 0, n_vifs_switch = 0, n_vifs_assign = 0, n_vifs_ctxless = 0;
lockdep_assert_held(&local->mtx);
lockdep_assert_held(&local->chanctx_mtx);
/*
* If there are 2 independent pairs of channel contexts performing
* cross-switch of their vifs this code will still wait until both are
* ready even though it could be possible to switch one before the
* other is ready.
*
* For practical reasons and code simplicity just do a single huge
* switch.
*/
/*
* Verify if the reservation is still feasible.
* - if it's not then disconnect
* - if it is but not all vifs necessary are ready then defer
*/
list_for_each_entry(ctx, &local->chanctx_list, list) {
if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
continue;
if (WARN_ON(!ctx->replace_ctx)) {
err = -EINVAL;
goto err;
}
if (!local->use_chanctx)
new_ctx = ctx;
n_ctx++;
n_assigned = 0;
n_reserved = 0;
n_ready = 0;
list_for_each_entry(sdata, &ctx->replace_ctx->assigned_vifs,
assigned_chanctx_list) {
n_assigned++;
if (sdata->reserved_chanctx) {
n_reserved++;
if (sdata->reserved_ready)
n_ready++;
}
}
if (n_assigned != n_reserved) {
if (n_ready == n_reserved) {
wiphy_info(local->hw.wiphy,
"channel context reservation cannot be finalized because some interfaces aren't switching\n");
err = -EBUSY;
goto err;
}
return -EAGAIN;
}
ctx->conf.radar_enabled = false;
list_for_each_entry(sdata, &ctx->reserved_vifs,
reserved_chanctx_list) {
if (ieee80211_vif_has_in_place_reservation(sdata) &&
!sdata->reserved_ready)
return -EAGAIN;
old_ctx = ieee80211_vif_get_chanctx(sdata);
if (old_ctx) {
if (old_ctx->replace_state ==
IEEE80211_CHANCTX_WILL_BE_REPLACED)
n_vifs_switch++;
else
n_vifs_assign++;
} else {
n_vifs_ctxless++;
}
if (sdata->reserved_radar_required)
ctx->conf.radar_enabled = true;
}
}
if (WARN_ON(n_ctx == 0) ||
WARN_ON(n_vifs_switch == 0 &&
n_vifs_assign == 0 &&
n_vifs_ctxless == 0) ||
WARN_ON(n_ctx > 1 && !local->use_chanctx) ||
WARN_ON(!new_ctx && !local->use_chanctx)) {
err = -EINVAL;
goto err;
}
/*
* All necessary vifs are ready. Perform the switch now depending on
* reservations and driver capabilities.
*/
if (local->use_chanctx) {
if (n_vifs_switch > 0) {
err = ieee80211_chsw_switch_vifs(local, n_vifs_switch);
if (err)
goto err;
}
if (n_vifs_assign > 0 || n_vifs_ctxless > 0) {
err = ieee80211_chsw_switch_ctxs(local);
if (err)
goto err;
}
} else {
err = ieee80211_chsw_switch_hwconf(local, new_ctx);
if (err)
goto err;
}
/*
* Update all structures, values and pointers to point to new channel
* context(s).
*/
list_for_each_entry(ctx, &local->chanctx_list, list) {
if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
continue;
if (WARN_ON(!ctx->replace_ctx)) {
err = -EINVAL;
goto err;
}
list_for_each_entry(sdata, &ctx->reserved_vifs,
reserved_chanctx_list) {
u32 changed = 0;
if (!ieee80211_vif_has_in_place_reservation(sdata))
continue;
rcu_assign_pointer(sdata->vif.chanctx_conf, &ctx->conf);
if (sdata->vif.type == NL80211_IFTYPE_AP)
__ieee80211_vif_copy_chanctx_to_vlans(sdata,
false);
ieee80211_check_fast_xmit_iface(sdata);
sdata->radar_required = sdata->reserved_radar_required;
if (sdata->vif.bss_conf.chandef.width !=
sdata->reserved_chandef.width)
changed = BSS_CHANGED_BANDWIDTH;
ieee80211_vif_update_chandef(sdata, &sdata->reserved_chandef);
if (changed)
ieee80211_bss_info_change_notify(sdata,
changed);
ieee80211_recalc_txpower(sdata, false);
}
ieee80211_recalc_chanctx_chantype(local, ctx);
ieee80211_recalc_smps_chanctx(local, ctx);
ieee80211_recalc_radar_chanctx(local, ctx);
ieee80211_recalc_chanctx_min_def(local, ctx);
list_for_each_entry_safe(sdata, sdata_tmp, &ctx->reserved_vifs,
reserved_chanctx_list) {
if (ieee80211_vif_get_chanctx(sdata) != ctx)
continue;
list_del(&sdata->reserved_chanctx_list);
list_move(&sdata->assigned_chanctx_list,
&ctx->assigned_vifs);
sdata->reserved_chanctx = NULL;
ieee80211_vif_chanctx_reservation_complete(sdata);
}
/*
* This context might have been a dependency for an already
* ready re-assign reservation interface that was deferred. Do
* not propagate error to the caller though. The in-place
* reservation for originally requested interface has already
* succeeded at this point.
*/
list_for_each_entry_safe(sdata, sdata_tmp, &ctx->reserved_vifs,
reserved_chanctx_list) {
if (WARN_ON(ieee80211_vif_has_in_place_reservation(
sdata)))
continue;
if (WARN_ON(sdata->reserved_chanctx != ctx))
continue;
if (!sdata->reserved_ready)
continue;
if (ieee80211_vif_get_chanctx(sdata))
err = ieee80211_vif_use_reserved_reassign(
sdata);
else
err = ieee80211_vif_use_reserved_assign(sdata);
if (err) {
sdata_info(sdata,
"failed to finalize (re-)assign reservation (err=%d)\n",
err);
ieee80211_vif_unreserve_chanctx(sdata);
cfg80211_stop_iface(local->hw.wiphy,
&sdata->wdev,
GFP_KERNEL);
}
}
}
/*
* Finally free old contexts
*/
list_for_each_entry_safe(ctx, ctx_tmp, &local->chanctx_list, list) {
if (ctx->replace_state != IEEE80211_CHANCTX_WILL_BE_REPLACED)
continue;
ctx->replace_ctx->replace_ctx = NULL;
ctx->replace_ctx->replace_state =
IEEE80211_CHANCTX_REPLACE_NONE;
list_del_rcu(&ctx->list);
kfree_rcu(ctx, rcu_head);
}
return 0;
err:
list_for_each_entry(ctx, &local->chanctx_list, list) {
if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER)
continue;
list_for_each_entry_safe(sdata, sdata_tmp, &ctx->reserved_vifs,
reserved_chanctx_list) {
ieee80211_vif_unreserve_chanctx(sdata);
ieee80211_vif_chanctx_reservation_complete(sdata);
}
}
return err;
}
static void __ieee80211_vif_release_channel(struct ieee80211_sub_if_data *sdata)
{
struct ieee80211_local *local = sdata->local;
struct ieee80211_chanctx_conf *conf;
struct ieee80211_chanctx *ctx;
bool use_reserved_switch = false;
lockdep_assert_held(&local->chanctx_mtx);
conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
lockdep_is_held(&local->chanctx_mtx));
if (!conf)
return;
ctx = container_of(conf, struct ieee80211_chanctx, conf);
if (sdata->reserved_chanctx) {
if (sdata->reserved_chanctx->replace_state ==
IEEE80211_CHANCTX_REPLACES_OTHER &&
ieee80211_chanctx_num_reserved(local,
sdata->reserved_chanctx) > 1)
use_reserved_switch = true;
ieee80211_vif_unreserve_chanctx(sdata);
}
ieee80211_assign_vif_chanctx(sdata, NULL);
if (ieee80211_chanctx_refcount(local, ctx) == 0)
ieee80211_free_chanctx(local, ctx);
sdata->radar_required = false;
/* Unreserving may ready an in-place reservation. */
if (use_reserved_switch)
ieee80211_vif_use_reserved_switch(local);
}
int ieee80211_vif_use_channel(struct ieee80211_sub_if_data *sdata,
const struct cfg80211_chan_def *chandef,
enum ieee80211_chanctx_mode mode)
{
struct ieee80211_local *local = sdata->local;
struct ieee80211_chanctx *ctx;
u8 radar_detect_width = 0;
int ret;
lockdep_assert_held(&local->mtx);
WARN_ON(sdata->dev && netif_carrier_ok(sdata->dev));
mutex_lock(&local->chanctx_mtx);
ret = cfg80211_chandef_dfs_required(local->hw.wiphy,
chandef,
sdata->wdev.iftype);
if (ret < 0)
goto out;
if (ret > 0)
radar_detect_width = BIT(chandef->width);
sdata->radar_required = ret;
ret = ieee80211_check_combinations(sdata, chandef, mode,
radar_detect_width);
if (ret < 0)
goto out;
__ieee80211_vif_release_channel(sdata);
ctx = ieee80211_find_chanctx(local, chandef, mode);
if (!ctx)
ctx = ieee80211_new_chanctx(local, chandef, mode);
if (IS_ERR(ctx)) {
ret = PTR_ERR(ctx);
goto out;
}
ieee80211_vif_update_chandef(sdata, chandef);
ret = ieee80211_assign_vif_chanctx(sdata, ctx);
if (ret) {
/* if assign fails refcount stays the same */
if (ieee80211_chanctx_refcount(local, ctx) == 0)
ieee80211_free_chanctx(local, ctx);
goto out;
}
ieee80211_recalc_smps_chanctx(local, ctx);
ieee80211_recalc_radar_chanctx(local, ctx);
out:
if (ret)
sdata->radar_required = false;
mutex_unlock(&local->chanctx_mtx);
return ret;
}
int ieee80211_vif_use_reserved_context(struct ieee80211_sub_if_data *sdata)
{
struct ieee80211_local *local = sdata->local;
struct ieee80211_chanctx *new_ctx;
struct ieee80211_chanctx *old_ctx;
int err;
lockdep_assert_held(&local->mtx);
lockdep_assert_held(&local->chanctx_mtx);
new_ctx = sdata->reserved_chanctx;
old_ctx = ieee80211_vif_get_chanctx(sdata);
if (WARN_ON(!new_ctx))
return -EINVAL;
if (WARN_ON(new_ctx->replace_state ==
IEEE80211_CHANCTX_WILL_BE_REPLACED))
return -EINVAL;
if (WARN_ON(sdata->reserved_ready))
return -EINVAL;
sdata->reserved_ready = true;
if (new_ctx->replace_state == IEEE80211_CHANCTX_REPLACE_NONE) {
if (old_ctx)
err = ieee80211_vif_use_reserved_reassign(sdata);
else
err = ieee80211_vif_use_reserved_assign(sdata);
if (err)
return err;
}
/*
* In-place reservation may need to be finalized now either if:
* a) sdata is taking part in the swapping itself and is the last one
* b) sdata has switched with a re-assign reservation to an existing
* context readying in-place switching of old_ctx
*
* In case of (b) do not propagate the error up because the requested
* sdata already switched successfully. Just spill an extra warning.
* The ieee80211_vif_use_reserved_switch() already stops all necessary
* interfaces upon failure.
*/
if ((old_ctx &&
old_ctx->replace_state == IEEE80211_CHANCTX_WILL_BE_REPLACED) ||
new_ctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER) {
err = ieee80211_vif_use_reserved_switch(local);
if (err && err != -EAGAIN) {
if (new_ctx->replace_state ==
IEEE80211_CHANCTX_REPLACES_OTHER)
return err;
wiphy_info(local->hw.wiphy,
"depending in-place reservation failed (err=%d)\n",
err);
}
}
return 0;
}
int ieee80211_vif_change_bandwidth(struct ieee80211_sub_if_data *sdata,
const struct cfg80211_chan_def *chandef,
u32 *changed)
{
struct ieee80211_local *local = sdata->local;
struct ieee80211_chanctx_conf *conf;
struct ieee80211_chanctx *ctx;
const struct cfg80211_chan_def *compat;
int ret;
if (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef,
IEEE80211_CHAN_DISABLED))
return -EINVAL;
mutex_lock(&local->chanctx_mtx);
if (cfg80211_chandef_identical(chandef, &sdata->vif.bss_conf.chandef)) {
ret = 0;
goto out;
}
if (chandef->width == NL80211_CHAN_WIDTH_20_NOHT ||
sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT) {
ret = -EINVAL;
goto out;
}
conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
lockdep_is_held(&local->chanctx_mtx));
if (!conf) {
ret = -EINVAL;
goto out;
}
ctx = container_of(conf, struct ieee80211_chanctx, conf);
compat = cfg80211_chandef_compatible(&conf->def, chandef);
if (!compat) {
ret = -EINVAL;
goto out;
}
switch (ctx->replace_state) {
case IEEE80211_CHANCTX_REPLACE_NONE:
if (!ieee80211_chanctx_reserved_chandef(local, ctx, compat)) {
ret = -EBUSY;
goto out;
}
break;
case IEEE80211_CHANCTX_WILL_BE_REPLACED:
/* TODO: Perhaps the bandwidth change could be treated as a
* reservation itself? */
ret = -EBUSY;
goto out;
case IEEE80211_CHANCTX_REPLACES_OTHER:
/* channel context that is going to replace another channel
* context doesn't really exist and shouldn't be assigned
* anywhere yet */
WARN_ON(1);
break;
}
ieee80211_vif_update_chandef(sdata, chandef);
ieee80211_recalc_chanctx_chantype(local, ctx);
*changed |= BSS_CHANGED_BANDWIDTH;
ret = 0;
out:
mutex_unlock(&local->chanctx_mtx);
return ret;
}
void ieee80211_vif_release_channel(struct ieee80211_sub_if_data *sdata)
{
WARN_ON(sdata->dev && netif_carrier_ok(sdata->dev));
lockdep_assert_held(&sdata->local->mtx);
mutex_lock(&sdata->local->chanctx_mtx);
__ieee80211_vif_release_channel(sdata);
mutex_unlock(&sdata->local->chanctx_mtx);
}
void ieee80211_vif_vlan_copy_chanctx(struct ieee80211_sub_if_data *sdata)
{
struct ieee80211_local *local = sdata->local;
struct ieee80211_sub_if_data *ap;
struct ieee80211_chanctx_conf *conf;
if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->bss))
return;
ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap);
mutex_lock(&local->chanctx_mtx);
conf = rcu_dereference_protected(ap->vif.chanctx_conf,
lockdep_is_held(&local->chanctx_mtx));
rcu_assign_pointer(sdata->vif.chanctx_conf, conf);
mutex_unlock(&local->chanctx_mtx);
}
void ieee80211_iter_chan_contexts_atomic(
struct ieee80211_hw *hw,
void (*iter)(struct ieee80211_hw *hw,
struct ieee80211_chanctx_conf *chanctx_conf,
void *data),
void *iter_data)
{
struct ieee80211_local *local = hw_to_local(hw);
struct ieee80211_chanctx *ctx;
rcu_read_lock();
list_for_each_entry_rcu(ctx, &local->chanctx_list, list)
if (ctx->driver_present)
iter(hw, &ctx->conf, iter_data);
rcu_read_unlock();
}
EXPORT_SYMBOL_GPL(ieee80211_iter_chan_contexts_atomic);