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linux/net/mac80211/link.c
Johannes Berg 6092077ad0 wifi: mac80211: introduce 'channel request' 
For channel contexts, mac80211 currently uses the cfg80211
chandef struct (control channel, center freq(s), width) to
define towards drivers and internally how these behave. In
fact, there are _two_ such structs used, where the min_def
can reduce bandwidth according to the stations connected.

Unfortunately,  with EHT this is longer be sufficient,  at
least not for all hardware.  EHT requires that non-AP STAs
that are connected to an AP with a lower bandwidth than it
(the AP) advertises (e.g. 160 MHz STA connected to 320 MHz
AP) still be able to receive downlink OFDMA and respond to
trigger frames for uplink OFDMA  that specify the position
and bandwidth  for the non-AP STA  relative to the channel
the AP is using.  Therefore, they need to be aware of this,
and at least for some hardware (e.g. Intel) this awareness
is in the hardware. As a result, use of the "same" channel
may need to be split over  two channel contexts where they
differ by the AP being used.

As a first step,  introduce a concept of a channel request
('chanreq') for each interface,  to control the context it
requests.   This step does nothing but reorganise the code,
so that later the AP's chandef can be added to the request
in order to handle the EHT case described above.

Link: https://msgid.link/20240129194108.2e88e48bd2e9.I4256183debe975c5ed71621611206fdbb69ba330@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2024-02-08 13:07:34 +01:00

499 lines
13 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
/*
* MLO link handling
*
* Copyright (C) 2022-2023 Intel Corporation
*/
#include <linux/slab.h>
#include <linux/kernel.h>
#include <net/mac80211.h>
#include "ieee80211_i.h"
#include "driver-ops.h"
#include "key.h"
#include "debugfs_netdev.h"
void ieee80211_link_setup(struct ieee80211_link_data *link)
{
if (link->sdata->vif.type == NL80211_IFTYPE_STATION)
ieee80211_mgd_setup_link(link);
}
void ieee80211_link_init(struct ieee80211_sub_if_data *sdata,
int link_id,
struct ieee80211_link_data *link,
struct ieee80211_bss_conf *link_conf)
{
bool deflink = link_id < 0;
if (link_id < 0)
link_id = 0;
rcu_assign_pointer(sdata->vif.link_conf[link_id], link_conf);
rcu_assign_pointer(sdata->link[link_id], link);
link->sdata = sdata;
link->link_id = link_id;
link->conf = link_conf;
link_conf->link_id = link_id;
link_conf->vif = &sdata->vif;
wiphy_work_init(&link->csa_finalize_work,
ieee80211_csa_finalize_work);
wiphy_work_init(&link->color_change_finalize_work,
ieee80211_color_change_finalize_work);
INIT_DELAYED_WORK(&link->color_collision_detect_work,
ieee80211_color_collision_detection_work);
INIT_LIST_HEAD(&link->assigned_chanctx_list);
INIT_LIST_HEAD(&link->reserved_chanctx_list);
wiphy_delayed_work_init(&link->dfs_cac_timer_work,
ieee80211_dfs_cac_timer_work);
if (!deflink) {
switch (sdata->vif.type) {
case NL80211_IFTYPE_AP:
ether_addr_copy(link_conf->addr,
sdata->wdev.links[link_id].addr);
link_conf->bssid = link_conf->addr;
WARN_ON(!(sdata->wdev.valid_links & BIT(link_id)));
break;
case NL80211_IFTYPE_STATION:
/* station sets the bssid in ieee80211_mgd_setup_link */
break;
default:
WARN_ON(1);
}
ieee80211_link_debugfs_add(link);
}
}
void ieee80211_link_stop(struct ieee80211_link_data *link)
{
if (link->sdata->vif.type == NL80211_IFTYPE_STATION)
ieee80211_mgd_stop_link(link);
cancel_delayed_work_sync(&link->color_collision_detect_work);
ieee80211_link_release_channel(link);
}
struct link_container {
struct ieee80211_link_data data;
struct ieee80211_bss_conf conf;
};
static void ieee80211_tear_down_links(struct ieee80211_sub_if_data *sdata,
struct link_container **links, u16 mask)
{
struct ieee80211_link_data *link;
LIST_HEAD(keys);
unsigned int link_id;
for (link_id = 0; link_id < IEEE80211_MLD_MAX_NUM_LINKS; link_id++) {
if (!(mask & BIT(link_id)))
continue;
link = &links[link_id]->data;
if (link_id == 0 && !link)
link = &sdata->deflink;
if (WARN_ON(!link))
continue;
ieee80211_remove_link_keys(link, &keys);
ieee80211_link_debugfs_remove(link);
ieee80211_link_stop(link);
}
synchronize_rcu();
ieee80211_free_key_list(sdata->local, &keys);
}
static void ieee80211_free_links(struct ieee80211_sub_if_data *sdata,
struct link_container **links)
{
unsigned int link_id;
for (link_id = 0; link_id < IEEE80211_MLD_MAX_NUM_LINKS; link_id++)
kfree(links[link_id]);
}
static int ieee80211_check_dup_link_addrs(struct ieee80211_sub_if_data *sdata)
{
unsigned int i, j;
for (i = 0; i < IEEE80211_MLD_MAX_NUM_LINKS; i++) {
struct ieee80211_link_data *link1;
link1 = sdata_dereference(sdata->link[i], sdata);
if (!link1)
continue;
for (j = i + 1; j < IEEE80211_MLD_MAX_NUM_LINKS; j++) {
struct ieee80211_link_data *link2;
link2 = sdata_dereference(sdata->link[j], sdata);
if (!link2)
continue;
if (ether_addr_equal(link1->conf->addr,
link2->conf->addr))
return -EALREADY;
}
}
return 0;
}
static void ieee80211_set_vif_links_bitmaps(struct ieee80211_sub_if_data *sdata,
u16 valid_links, u16 dormant_links)
{
sdata->vif.valid_links = valid_links;
sdata->vif.dormant_links = dormant_links;
if (!valid_links ||
WARN((~valid_links & dormant_links) ||
!(valid_links & ~dormant_links),
"Invalid links: valid=0x%x, dormant=0x%x",
valid_links, dormant_links)) {
sdata->vif.active_links = 0;
sdata->vif.dormant_links = 0;
return;
}
switch (sdata->vif.type) {
case NL80211_IFTYPE_AP:
/* in an AP all links are always active */
sdata->vif.active_links = valid_links;
/* AP links are not expected to be disabled */
WARN_ON(dormant_links);
break;
case NL80211_IFTYPE_STATION:
if (sdata->vif.active_links)
break;
sdata->vif.active_links = valid_links & ~dormant_links;
WARN_ON(hweight16(sdata->vif.active_links) > 1);
break;
default:
WARN_ON(1);
}
}
static int ieee80211_vif_update_links(struct ieee80211_sub_if_data *sdata,
struct link_container **to_free,
u16 new_links, u16 dormant_links)
{
u16 old_links = sdata->vif.valid_links;
u16 old_active = sdata->vif.active_links;
unsigned long add = new_links & ~old_links;
unsigned long rem = old_links & ~new_links;
unsigned int link_id;
int ret;
struct link_container *links[IEEE80211_MLD_MAX_NUM_LINKS] = {}, *link;
struct ieee80211_bss_conf *old[IEEE80211_MLD_MAX_NUM_LINKS];
struct ieee80211_link_data *old_data[IEEE80211_MLD_MAX_NUM_LINKS];
bool use_deflink = old_links == 0; /* set for error case */
lockdep_assert_wiphy(sdata->local->hw.wiphy);
memset(to_free, 0, sizeof(links));
if (old_links == new_links && dormant_links == sdata->vif.dormant_links)
return 0;
/* if there were no old links, need to clear the pointers to deflink */
if (!old_links)
rem |= BIT(0);
/* allocate new link structures first */
for_each_set_bit(link_id, &add, IEEE80211_MLD_MAX_NUM_LINKS) {
link = kzalloc(sizeof(*link), GFP_KERNEL);
if (!link) {
ret = -ENOMEM;
goto free;
}
links[link_id] = link;
}
/* keep track of the old pointers for the driver */
BUILD_BUG_ON(sizeof(old) != sizeof(sdata->vif.link_conf));
memcpy(old, sdata->vif.link_conf, sizeof(old));
/* and for us in error cases */
BUILD_BUG_ON(sizeof(old_data) != sizeof(sdata->link));
memcpy(old_data, sdata->link, sizeof(old_data));
/* grab old links to free later */
for_each_set_bit(link_id, &rem, IEEE80211_MLD_MAX_NUM_LINKS) {
if (rcu_access_pointer(sdata->link[link_id]) != &sdata->deflink) {
/*
* we must have allocated the data through this path so
* we know we can free both at the same time
*/
to_free[link_id] = container_of(rcu_access_pointer(sdata->link[link_id]),
typeof(*links[link_id]),
data);
}
RCU_INIT_POINTER(sdata->link[link_id], NULL);
RCU_INIT_POINTER(sdata->vif.link_conf[link_id], NULL);
}
if (!old_links)
ieee80211_debugfs_recreate_netdev(sdata, true);
/* link them into data structures */
for_each_set_bit(link_id, &add, IEEE80211_MLD_MAX_NUM_LINKS) {
WARN_ON(!use_deflink &&
rcu_access_pointer(sdata->link[link_id]) == &sdata->deflink);
link = links[link_id];
ieee80211_link_init(sdata, link_id, &link->data, &link->conf);
ieee80211_link_setup(&link->data);
}
if (new_links == 0)
ieee80211_link_init(sdata, -1, &sdata->deflink,
&sdata->vif.bss_conf);
ret = ieee80211_check_dup_link_addrs(sdata);
if (!ret) {
/* for keys we will not be able to undo this */
ieee80211_tear_down_links(sdata, to_free, rem);
ieee80211_set_vif_links_bitmaps(sdata, new_links, dormant_links);
/* tell the driver */
ret = drv_change_vif_links(sdata->local, sdata,
old_links & old_active,
new_links & sdata->vif.active_links,
old);
if (!new_links)
ieee80211_debugfs_recreate_netdev(sdata, false);
}
if (ret) {
/* restore config */
memcpy(sdata->link, old_data, sizeof(old_data));
memcpy(sdata->vif.link_conf, old, sizeof(old));
ieee80211_set_vif_links_bitmaps(sdata, old_links, dormant_links);
/* and free (only) the newly allocated links */
memset(to_free, 0, sizeof(links));
goto free;
}
/* use deflink/bss_conf again if and only if there are no more links */
use_deflink = new_links == 0;
goto deinit;
free:
/* if we failed during allocation, only free all */
for (link_id = 0; link_id < IEEE80211_MLD_MAX_NUM_LINKS; link_id++) {
kfree(links[link_id]);
links[link_id] = NULL;
}
deinit:
if (use_deflink)
ieee80211_link_init(sdata, -1, &sdata->deflink,
&sdata->vif.bss_conf);
return ret;
}
int ieee80211_vif_set_links(struct ieee80211_sub_if_data *sdata,
u16 new_links, u16 dormant_links)
{
struct link_container *links[IEEE80211_MLD_MAX_NUM_LINKS];
int ret;
ret = ieee80211_vif_update_links(sdata, links, new_links,
dormant_links);
ieee80211_free_links(sdata, links);
return ret;
}
static int _ieee80211_set_active_links(struct ieee80211_sub_if_data *sdata,
u16 active_links)
{
struct ieee80211_bss_conf *link_confs[IEEE80211_MLD_MAX_NUM_LINKS];
struct ieee80211_local *local = sdata->local;
u16 old_active = sdata->vif.active_links;
unsigned long rem = old_active & ~active_links;
unsigned long add = active_links & ~old_active;
struct sta_info *sta;
unsigned int link_id;
int ret, i;
if (!ieee80211_sdata_running(sdata))
return -ENETDOWN;
if (sdata->vif.type != NL80211_IFTYPE_STATION)
return -EINVAL;
if (active_links & ~ieee80211_vif_usable_links(&sdata->vif))
return -EINVAL;
/* nothing to do */
if (old_active == active_links)
return 0;
for (i = 0; i < IEEE80211_MLD_MAX_NUM_LINKS; i++)
link_confs[i] = sdata_dereference(sdata->vif.link_conf[i],
sdata);
if (add) {
sdata->vif.active_links |= active_links;
ret = drv_change_vif_links(local, sdata,
old_active,
sdata->vif.active_links,
link_confs);
if (ret) {
sdata->vif.active_links = old_active;
return ret;
}
}
for_each_set_bit(link_id, &rem, IEEE80211_MLD_MAX_NUM_LINKS) {
struct ieee80211_link_data *link;
link = sdata_dereference(sdata->link[link_id], sdata);
/* FIXME: kill TDLS connections on the link */
ieee80211_link_release_channel(link);
}
list_for_each_entry(sta, &local->sta_list, list) {
if (sdata != sta->sdata)
continue;
/* this is very temporary, but do it anyway */
__ieee80211_sta_recalc_aggregates(sta,
old_active | active_links);
ret = drv_change_sta_links(local, sdata, &sta->sta,
old_active,
old_active | active_links);
WARN_ON_ONCE(ret);
}
ret = ieee80211_key_switch_links(sdata, rem, add);
WARN_ON_ONCE(ret);
list_for_each_entry(sta, &local->sta_list, list) {
if (sdata != sta->sdata)
continue;
__ieee80211_sta_recalc_aggregates(sta, active_links);
ret = drv_change_sta_links(local, sdata, &sta->sta,
old_active | active_links,
active_links);
WARN_ON_ONCE(ret);
/*
* Do it again, just in case - the driver might very
* well have called ieee80211_sta_recalc_aggregates()
* from there when filling in the new links, which
* would set it wrong since the vif's active links are
* not switched yet...
*/
__ieee80211_sta_recalc_aggregates(sta, active_links);
}
for_each_set_bit(link_id, &add, IEEE80211_MLD_MAX_NUM_LINKS) {
struct ieee80211_link_data *link;
link = sdata_dereference(sdata->link[link_id], sdata);
ret = ieee80211_link_use_channel(link,
&link->conf->chanreq,
IEEE80211_CHANCTX_SHARED);
WARN_ON_ONCE(ret);
ieee80211_mgd_set_link_qos_params(link);
ieee80211_link_info_change_notify(sdata, link,
BSS_CHANGED_ERP_CTS_PROT |
BSS_CHANGED_ERP_PREAMBLE |
BSS_CHANGED_ERP_SLOT |
BSS_CHANGED_HT |
BSS_CHANGED_BASIC_RATES |
BSS_CHANGED_BSSID |
BSS_CHANGED_CQM |
BSS_CHANGED_QOS |
BSS_CHANGED_TXPOWER |
BSS_CHANGED_BANDWIDTH |
BSS_CHANGED_TWT |
BSS_CHANGED_HE_OBSS_PD |
BSS_CHANGED_HE_BSS_COLOR);
}
old_active = sdata->vif.active_links;
sdata->vif.active_links = active_links;
if (rem) {
ret = drv_change_vif_links(local, sdata, old_active,
active_links, link_confs);
WARN_ON_ONCE(ret);
}
return 0;
}
int ieee80211_set_active_links(struct ieee80211_vif *vif, u16 active_links)
{
struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
struct ieee80211_local *local = sdata->local;
u16 old_active;
int ret;
lockdep_assert_wiphy(local->hw.wiphy);
if (WARN_ON(!active_links))
return -EINVAL;
if (!drv_can_activate_links(local, sdata, active_links))
return -EINVAL;
old_active = sdata->vif.active_links;
if (old_active & active_links) {
/*
* if there's at least one link that stays active across
* the change then switch to it (to those) first, and
* then enable the additional links
*/
ret = _ieee80211_set_active_links(sdata,
old_active & active_links);
if (!ret)
ret = _ieee80211_set_active_links(sdata, active_links);
} else {
/* otherwise switch directly */
ret = _ieee80211_set_active_links(sdata, active_links);
}
return ret;
}
EXPORT_SYMBOL_GPL(ieee80211_set_active_links);
void ieee80211_set_active_links_async(struct ieee80211_vif *vif,
u16 active_links)
{
struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
if (WARN_ON(!active_links))
return;
if (!ieee80211_sdata_running(sdata))
return;
if (sdata->vif.type != NL80211_IFTYPE_STATION)
return;
if (active_links & ~ieee80211_vif_usable_links(&sdata->vif))
return;
/* nothing to do */
if (sdata->vif.active_links == active_links)
return;
sdata->desired_active_links = active_links;
wiphy_work_queue(sdata->local->hw.wiphy, &sdata->activate_links_work);
}
EXPORT_SYMBOL_GPL(ieee80211_set_active_links_async);
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