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linux/net/mac80211/s1g.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

199 lines
5.5 KiB
C
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// SPDX-License-Identifier: GPL-2.0
/*
* S1G handling
* Copyright(c) 2020 Adapt-IP
*/
#include <linux/ieee80211.h>
#include <net/mac80211.h>
#include "ieee80211_i.h"
#include "driver-ops.h"
void ieee80211_s1g_sta_rate_init(struct sta_info *sta)
{
/* avoid indicating legacy bitrates for S1G STAs */
sta->deflink.tx_stats.last_rate.flags |= IEEE80211_TX_RC_S1G_MCS;
sta->deflink.rx_stats.last_rate =
STA_STATS_FIELD(TYPE, STA_STATS_RATE_TYPE_S1G);
}
bool ieee80211_s1g_is_twt_setup(struct sk_buff *skb)
{
struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)skb->data;
if (likely(!ieee80211_is_action(mgmt->frame_control)))
return false;
if (likely(mgmt->u.action.category != WLAN_CATEGORY_S1G))
return false;
return mgmt->u.action.u.s1g.action_code == WLAN_S1G_TWT_SETUP;
}
static void
ieee80211_s1g_send_twt_setup(struct ieee80211_sub_if_data *sdata, const u8 *da,
const u8 *bssid, struct ieee80211_twt_setup *twt)
{
int len = IEEE80211_MIN_ACTION_SIZE + 4 + twt->length;
struct ieee80211_local *local = sdata->local;
struct ieee80211_mgmt *mgmt;
struct sk_buff *skb;
skb = dev_alloc_skb(local->hw.extra_tx_headroom + len);
if (!skb)
return;
skb_reserve(skb, local->hw.extra_tx_headroom);
mgmt = skb_put_zero(skb, len);
mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
IEEE80211_STYPE_ACTION);
memcpy(mgmt->da, da, ETH_ALEN);
memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
memcpy(mgmt->bssid, bssid, ETH_ALEN);
mgmt->u.action.category = WLAN_CATEGORY_S1G;
mgmt->u.action.u.s1g.action_code = WLAN_S1G_TWT_SETUP;
memcpy(mgmt->u.action.u.s1g.variable, twt, 3 + twt->length);
IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
IEEE80211_TX_INTFL_MLME_CONN_TX |
IEEE80211_TX_CTL_REQ_TX_STATUS;
ieee80211_tx_skb(sdata, skb);
}
static void
ieee80211_s1g_send_twt_teardown(struct ieee80211_sub_if_data *sdata,
const u8 *da, const u8 *bssid, u8 flowid)
{
struct ieee80211_local *local = sdata->local;
struct ieee80211_mgmt *mgmt;
struct sk_buff *skb;
u8 *id;
skb = dev_alloc_skb(local->hw.extra_tx_headroom +
IEEE80211_MIN_ACTION_SIZE + 2);
if (!skb)
return;
skb_reserve(skb, local->hw.extra_tx_headroom);
mgmt = skb_put_zero(skb, IEEE80211_MIN_ACTION_SIZE + 2);
mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
IEEE80211_STYPE_ACTION);
memcpy(mgmt->da, da, ETH_ALEN);
memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
memcpy(mgmt->bssid, bssid, ETH_ALEN);
mgmt->u.action.category = WLAN_CATEGORY_S1G;
mgmt->u.action.u.s1g.action_code = WLAN_S1G_TWT_TEARDOWN;
id = (u8 *)mgmt->u.action.u.s1g.variable;
*id = flowid;
IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
IEEE80211_TX_CTL_REQ_TX_STATUS;
ieee80211_tx_skb(sdata, skb);
}
static void
ieee80211_s1g_rx_twt_setup(struct ieee80211_sub_if_data *sdata,
struct sta_info *sta, struct sk_buff *skb)
{
struct ieee80211_mgmt *mgmt = (void *)skb->data;
struct ieee80211_twt_setup *twt = (void *)mgmt->u.action.u.s1g.variable;
struct ieee80211_twt_params *twt_agrt = (void *)twt->params;
twt_agrt->req_type &= cpu_to_le16(~IEEE80211_TWT_REQTYPE_REQUEST);
/* broadcast TWT not supported yet */
if (twt->control & IEEE80211_TWT_CONTROL_NEG_TYPE_BROADCAST) {
twt_agrt->req_type &=
~cpu_to_le16(IEEE80211_TWT_REQTYPE_SETUP_CMD);
twt_agrt->req_type |=
le16_encode_bits(TWT_SETUP_CMD_REJECT,
IEEE80211_TWT_REQTYPE_SETUP_CMD);
goto out;
}
drv_add_twt_setup(sdata->local, sdata, &sta->sta, twt);
out:
ieee80211_s1g_send_twt_setup(sdata, mgmt->sa, sdata->vif.addr, twt);
}
static void
ieee80211_s1g_rx_twt_teardown(struct ieee80211_sub_if_data *sdata,
struct sta_info *sta, struct sk_buff *skb)
{
struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)skb->data;
drv_twt_teardown_request(sdata->local, sdata, &sta->sta,
mgmt->u.action.u.s1g.variable[0]);
}
static void
ieee80211_s1g_tx_twt_setup_fail(struct ieee80211_sub_if_data *sdata,
struct sta_info *sta, struct sk_buff *skb)
{
struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)skb->data;
struct ieee80211_twt_setup *twt = (void *)mgmt->u.action.u.s1g.variable;
struct ieee80211_twt_params *twt_agrt = (void *)twt->params;
u8 flowid = le16_get_bits(twt_agrt->req_type,
IEEE80211_TWT_REQTYPE_FLOWID);
drv_twt_teardown_request(sdata->local, sdata, &sta->sta, flowid);
ieee80211_s1g_send_twt_teardown(sdata, mgmt->sa, sdata->vif.addr,
flowid);
}
void ieee80211_s1g_rx_twt_action(struct ieee80211_sub_if_data *sdata,
struct sk_buff *skb)
{
struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)skb->data;
struct ieee80211_local *local = sdata->local;
struct sta_info *sta;
mutex_lock(&local->sta_mtx);
sta = sta_info_get_bss(sdata, mgmt->sa);
if (!sta)
goto out;
switch (mgmt->u.action.u.s1g.action_code) {
case WLAN_S1G_TWT_SETUP:
ieee80211_s1g_rx_twt_setup(sdata, sta, skb);
break;
case WLAN_S1G_TWT_TEARDOWN:
ieee80211_s1g_rx_twt_teardown(sdata, sta, skb);
break;
default:
break;
}
out:
mutex_unlock(&local->sta_mtx);
}
void ieee80211_s1g_status_twt_action(struct ieee80211_sub_if_data *sdata,
struct sk_buff *skb)
{
struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)skb->data;
struct ieee80211_local *local = sdata->local;
struct sta_info *sta;
mutex_lock(&local->sta_mtx);
sta = sta_info_get_bss(sdata, mgmt->da);
if (!sta)
goto out;
switch (mgmt->u.action.u.s1g.action_code) {
case WLAN_S1G_TWT_SETUP:
/* process failed twt setup frames */
ieee80211_s1g_tx_twt_setup_fail(sdata, sta, skb);
break;
default:
break;
}
out:
mutex_unlock(&local->sta_mtx);
}
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