linux-stable/net/mac80211/ocb.c
Sriram R 046d2e7c50 mac80211: prepare sta handling for MLO support
Currently in mac80211 each STA object is represented
using sta_info datastructure with the associated
STA specific information and drivers access ieee80211_sta
part of it.

With MLO (Multi Link Operation) support being added
in 802.11be standard, though the association is logically
with a single Multi Link capable STA, at the physical level
communication can happen via different advertised
links (uniquely identified by Channel, operating class,
BSSID) and hence the need to handle multiple link
STA parameters within a composite sta_info object
called the MLD STA. The different link STA part of
MLD STA are identified using the link address which can
be same or different as the MLD STA address and unique
link id based on the link vif.

To support extension of such a model, the sta_info
datastructure is modified to hold multiple link STA
objects with link specific params currently within
sta_info moved to this new structure. Similarly this is
done for ieee80211_sta as well which will be accessed
within mac80211 as well as by drivers, hence trivial
driver changes are expected to support this.

For current non MLO supported drivers, only one link STA
is present and link information is accessed via 'deflink'
member.

For MLO drivers, we still need to define the APIs etc. to
get the correct link ID and access the correct part of
the station info.

Currently in mac80211, all link STA info are accessed directly
via deflink. These will be updated to access via link pointers
indexed by link id with MLO support patches, with link id
being 0 for non MLO supported cases.

Except for couple of macro related changes, below spatch takes
care of updating mac80211 and driver code to access to the
link STA info via deflink.

  @ieee80211_sta@
  struct ieee80211_sta *s;
  struct sta_info *si;
  identifier var = {supp_rates, ht_cap, vht_cap, he_cap, he_6ghz_capa, eht_cap, rx_nss, bandwidth, txpwr};
  @@

  (
    s->
  -    var
  +    deflink.var
  |
   si->sta.
  -    var
  +    deflink.var
  )

  @sta_info@
  struct sta_info *si;
  identifier var = {gtk, pcpu_rx_stats, rx_stats, rx_stats_avg, status_stats, tx_stats, cur_max_bandwidth};
  @@

  (
    si->
  -    var
  +    deflink.var
  )

Signed-off-by: Sriram R <quic_srirrama@quicinc.com>
Link: https://lore.kernel.org/r/1649086883-13246-1-git-send-email-quic_srirrama@quicinc.com
[remove MLO-drivers notes from commit message, not clear yet; run spatch]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2022-04-11 16:42:03 +02:00

245 lines
6.7 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/*
* OCB mode implementation
*
* Copyright: (c) 2014 Czech Technical University in Prague
* (c) 2014 Volkswagen Group Research
* Author: Rostislav Lisovy <rostislav.lisovy@fel.cvut.cz>
* Funded by: Volkswagen Group Research
*/
#include <linux/delay.h>
#include <linux/if_ether.h>
#include <linux/skbuff.h>
#include <linux/if_arp.h>
#include <linux/etherdevice.h>
#include <linux/rtnetlink.h>
#include <net/mac80211.h>
#include <asm/unaligned.h>
#include "ieee80211_i.h"
#include "driver-ops.h"
#include "rate.h"
#define IEEE80211_OCB_HOUSEKEEPING_INTERVAL (60 * HZ)
#define IEEE80211_OCB_PEER_INACTIVITY_LIMIT (240 * HZ)
#define IEEE80211_OCB_MAX_STA_ENTRIES 128
/**
* enum ocb_deferred_task_flags - mac80211 OCB deferred tasks
* @OCB_WORK_HOUSEKEEPING: run the periodic OCB housekeeping tasks
*
* These flags are used in @wrkq_flags field of &struct ieee80211_if_ocb
*/
enum ocb_deferred_task_flags {
OCB_WORK_HOUSEKEEPING,
};
void ieee80211_ocb_rx_no_sta(struct ieee80211_sub_if_data *sdata,
const u8 *bssid, const u8 *addr,
u32 supp_rates)
{
struct ieee80211_if_ocb *ifocb = &sdata->u.ocb;
struct ieee80211_local *local = sdata->local;
struct ieee80211_chanctx_conf *chanctx_conf;
struct ieee80211_supported_band *sband;
enum nl80211_bss_scan_width scan_width;
struct sta_info *sta;
int band;
/* XXX: Consider removing the least recently used entry and
* allow new one to be added.
*/
if (local->num_sta >= IEEE80211_OCB_MAX_STA_ENTRIES) {
net_info_ratelimited("%s: No room for a new OCB STA entry %pM\n",
sdata->name, addr);
return;
}
ocb_dbg(sdata, "Adding new OCB station %pM\n", addr);
rcu_read_lock();
chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
if (WARN_ON_ONCE(!chanctx_conf)) {
rcu_read_unlock();
return;
}
band = chanctx_conf->def.chan->band;
scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
rcu_read_unlock();
sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
if (!sta)
return;
/* Add only mandatory rates for now */
sband = local->hw.wiphy->bands[band];
sta->sta.deflink.supp_rates[band] =
ieee80211_mandatory_rates(sband, scan_width);
spin_lock(&ifocb->incomplete_lock);
list_add(&sta->list, &ifocb->incomplete_stations);
spin_unlock(&ifocb->incomplete_lock);
ieee80211_queue_work(&local->hw, &sdata->work);
}
static struct sta_info *ieee80211_ocb_finish_sta(struct sta_info *sta)
__acquires(RCU)
{
struct ieee80211_sub_if_data *sdata = sta->sdata;
u8 addr[ETH_ALEN];
memcpy(addr, sta->sta.addr, ETH_ALEN);
ocb_dbg(sdata, "Adding new IBSS station %pM (dev=%s)\n",
addr, sdata->name);
sta_info_move_state(sta, IEEE80211_STA_AUTH);
sta_info_move_state(sta, IEEE80211_STA_ASSOC);
sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
rate_control_rate_init(sta);
/* If it fails, maybe we raced another insertion? */
if (sta_info_insert_rcu(sta))
return sta_info_get(sdata, addr);
return sta;
}
static void ieee80211_ocb_housekeeping(struct ieee80211_sub_if_data *sdata)
{
struct ieee80211_if_ocb *ifocb = &sdata->u.ocb;
ocb_dbg(sdata, "Running ocb housekeeping\n");
ieee80211_sta_expire(sdata, IEEE80211_OCB_PEER_INACTIVITY_LIMIT);
mod_timer(&ifocb->housekeeping_timer,
round_jiffies(jiffies + IEEE80211_OCB_HOUSEKEEPING_INTERVAL));
}
void ieee80211_ocb_work(struct ieee80211_sub_if_data *sdata)
{
struct ieee80211_if_ocb *ifocb = &sdata->u.ocb;
struct sta_info *sta;
if (ifocb->joined != true)
return;
sdata_lock(sdata);
spin_lock_bh(&ifocb->incomplete_lock);
while (!list_empty(&ifocb->incomplete_stations)) {
sta = list_first_entry(&ifocb->incomplete_stations,
struct sta_info, list);
list_del(&sta->list);
spin_unlock_bh(&ifocb->incomplete_lock);
ieee80211_ocb_finish_sta(sta);
rcu_read_unlock();
spin_lock_bh(&ifocb->incomplete_lock);
}
spin_unlock_bh(&ifocb->incomplete_lock);
if (test_and_clear_bit(OCB_WORK_HOUSEKEEPING, &ifocb->wrkq_flags))
ieee80211_ocb_housekeeping(sdata);
sdata_unlock(sdata);
}
static void ieee80211_ocb_housekeeping_timer(struct timer_list *t)
{
struct ieee80211_sub_if_data *sdata =
from_timer(sdata, t, u.ocb.housekeeping_timer);
struct ieee80211_local *local = sdata->local;
struct ieee80211_if_ocb *ifocb = &sdata->u.ocb;
set_bit(OCB_WORK_HOUSEKEEPING, &ifocb->wrkq_flags);
ieee80211_queue_work(&local->hw, &sdata->work);
}
void ieee80211_ocb_setup_sdata(struct ieee80211_sub_if_data *sdata)
{
struct ieee80211_if_ocb *ifocb = &sdata->u.ocb;
timer_setup(&ifocb->housekeeping_timer,
ieee80211_ocb_housekeeping_timer, 0);
INIT_LIST_HEAD(&ifocb->incomplete_stations);
spin_lock_init(&ifocb->incomplete_lock);
}
int ieee80211_ocb_join(struct ieee80211_sub_if_data *sdata,
struct ocb_setup *setup)
{
struct ieee80211_local *local = sdata->local;
struct ieee80211_if_ocb *ifocb = &sdata->u.ocb;
u32 changed = BSS_CHANGED_OCB | BSS_CHANGED_BSSID;
int err;
if (ifocb->joined == true)
return -EINVAL;
sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
sdata->smps_mode = IEEE80211_SMPS_OFF;
sdata->needed_rx_chains = sdata->local->rx_chains;
mutex_lock(&sdata->local->mtx);
err = ieee80211_vif_use_channel(sdata, &setup->chandef,
IEEE80211_CHANCTX_SHARED);
mutex_unlock(&sdata->local->mtx);
if (err)
return err;
ieee80211_bss_info_change_notify(sdata, changed);
ifocb->joined = true;
set_bit(OCB_WORK_HOUSEKEEPING, &ifocb->wrkq_flags);
ieee80211_queue_work(&local->hw, &sdata->work);
netif_carrier_on(sdata->dev);
return 0;
}
int ieee80211_ocb_leave(struct ieee80211_sub_if_data *sdata)
{
struct ieee80211_if_ocb *ifocb = &sdata->u.ocb;
struct ieee80211_local *local = sdata->local;
struct sta_info *sta;
ifocb->joined = false;
sta_info_flush(sdata);
spin_lock_bh(&ifocb->incomplete_lock);
while (!list_empty(&ifocb->incomplete_stations)) {
sta = list_first_entry(&ifocb->incomplete_stations,
struct sta_info, list);
list_del(&sta->list);
spin_unlock_bh(&ifocb->incomplete_lock);
sta_info_free(local, sta);
spin_lock_bh(&ifocb->incomplete_lock);
}
spin_unlock_bh(&ifocb->incomplete_lock);
netif_carrier_off(sdata->dev);
clear_bit(SDATA_STATE_OFFCHANNEL, &sdata->state);
ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_OCB);
mutex_lock(&sdata->local->mtx);
ieee80211_vif_release_channel(sdata);
mutex_unlock(&sdata->local->mtx);
skb_queue_purge(&sdata->skb_queue);
del_timer_sync(&sdata->u.ocb.housekeeping_timer);
/* If the timer fired while we waited for it, it will have
* requeued the work. Now the work will be running again
* but will not rearm the timer again because it checks
* whether we are connected to the network or not -- at this
* point we shouldn't be anymore.
*/
return 0;
}