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wifi: mac80211: introduce a feature flag for quiet in CSA 

When doing CSA in multi-link, there really isn't a need to
stop transmissions entirely. Add a feature flag for drivers
to indicate they can handle quiet in CSA (be it by parsing
themselves, or by implementing drv_pre_channel_switch()),
to make that possible.

Also clean up the csa_block_tx handling: it clearly cannot
handle multi-link due to the way queues are stopped, move
it to the sdata. Drivers should be doing it themselves for
working properly during CSA in MLO anyway. Also rename it
to indicate that it reflects TX was blocked at mac80211.

Reviewed-by: Miriam Rachel Korenblit <miriam.rachel.korenblit@intel.com>
Link: https://msgid.link/20240228095719.258439191541.I2469d206e2bf5cb244cfde2b4bbc2ae6d1cd3dd9@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Johannes Berg 2024-02-28 09:55:45 +01:00
parent 5ecd5d82b1
commit 6f0107d195
6 changed files with 43 additions and 26 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
include/net/mac80211.h
View File

@ -2778,6 +2778,11 @@ struct ieee80211_txq {
* @IEEE80211_HW_DISALLOW_PUNCTURING: HW requires disabling puncturing in EHT
* and connecting with a lower bandwidth instead
*
* @IEEE80211_HW_HANDLES_QUIET_CSA: HW/driver handles quieting for CSA, so
* no need to stop queues. This really should be set by a driver that
* implements MLO, so operation can continue on other links when one
* link is switching.
*
* @NUM_IEEE80211_HW_FLAGS: number of hardware flags, used for sizing arrays
*/
enum ieee80211_hw_flags {
@ -2836,6 +2841,7 @@ enum ieee80211_hw_flags {
IEEE80211_HW_DETECTS_COLOR_COLLISION,
IEEE80211_HW_MLO_MCAST_MULTI_LINK_TX,
IEEE80211_HW_DISALLOW_PUNCTURING,
IEEE80211_HW_HANDLES_QUIET_CSA,
/* keep last, obviously */
NUM_IEEE80211_HW_FLAGS

16
net/mac80211/cfg.c
View File

@ -1607,10 +1607,10 @@ static int ieee80211_stop_ap(struct wiphy *wiphy, struct net_device *dev,
/* abort any running channel switch or color change */
link_conf->csa_active = false;
link_conf->color_change_active = false;
if (link->csa_block_tx) {
if (sdata->csa_blocked_tx) {
ieee80211_wake_vif_queues(local, sdata,
IEEE80211_QUEUE_STOP_REASON_CSA);
link->csa_block_tx = false;
sdata->csa_blocked_tx = false;
}
ieee80211_free_next_beacon(link);
@ -3649,7 +3649,7 @@ void ieee80211_channel_switch_disconnect(struct ieee80211_vif *vif, bool block_t
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
struct ieee80211_local *local = sdata->local;
sdata->deflink.csa_block_tx = block_tx;
sdata->csa_blocked_tx = block_tx;
sdata_info(sdata, "channel switch failed, disconnecting\n");
wiphy_work_queue(local->hw.wiphy, &ifmgd->csa_connection_drop_work);
}
@ -3735,10 +3735,10 @@ static int __ieee80211_csa_finalize(struct ieee80211_link_data *link_data)
ieee80211_link_info_change_notify(sdata, link_data, changed);
if (link_data->csa_block_tx) {
if (sdata->csa_blocked_tx) {
ieee80211_wake_vif_queues(local, sdata,
IEEE80211_QUEUE_STOP_REASON_CSA);
link_data->csa_block_tx = false;
sdata->csa_blocked_tx = false;
}
err = drv_post_channel_switch(link_data);
@ -4014,12 +4014,14 @@ __ieee80211_channel_switch(struct wiphy *wiphy, struct net_device *dev,
}
link_data->csa_chanreq = chanreq;
link_data->csa_block_tx = params->block_tx;
link_conf->csa_active = true;
if (link_data->csa_block_tx)
if (params->block_tx &&
!ieee80211_hw_check(&local->hw, HANDLES_QUIET_CSA)) {
ieee80211_stop_vif_queues(local, sdata,
IEEE80211_QUEUE_STOP_REASON_CSA);
sdata->csa_blocked_tx = true;
}
cfg80211_ch_switch_started_notify(sdata->dev,
&link_data->csa_chanreq.oper, 0,

3
net/mac80211/debugfs.c
View File

@ -4,7 +4,7 @@
*
* Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
* Copyright 2013-2014 Intel Mobile Communications GmbH
* Copyright (C) 2018 - 2019, 2021-2023 Intel Corporation
* Copyright (C) 2018 - 2019, 2021-2024 Intel Corporation
*/
#include <linux/debugfs.h>
@ -498,6 +498,7 @@ static const char *hw_flag_names[] = {
FLAG(DETECTS_COLOR_COLLISION),
FLAG(MLO_MCAST_MULTI_LINK_TX),
FLAG(DISALLOW_PUNCTURING),
FLAG(HANDLES_QUIET_CSA),
#undef FLAG
};

3
net/mac80211/ieee80211_i.h
View File

@ -1034,7 +1034,6 @@ struct ieee80211_link_data {
struct ieee80211_key __rcu *default_beacon_key;
struct wiphy_work csa_finalize_work;
bool csa_block_tx;
bool operating_11g_mode;
@ -1093,6 +1092,8 @@ struct ieee80211_sub_if_data {
unsigned long state;
bool csa_blocked_tx;
char name[IFNAMSIZ];
struct ieee80211_fragment_cache frags;

6
net/mac80211/iface.c
View File

@ -8,7 +8,7 @@
* Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
* Copyright 2013-2014 Intel Mobile Communications GmbH
* Copyright (c) 2016 Intel Deutschland GmbH
* Copyright (C) 2018-2023 Intel Corporation
* Copyright (C) 2018-2024 Intel Corporation
*/
#include <linux/slab.h>
#include <linux/kernel.h>
@ -544,10 +544,10 @@ static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata, bool going_do
sdata->vif.bss_conf.csa_active = false;
if (sdata->vif.type == NL80211_IFTYPE_STATION)
sdata->deflink.u.mgd.csa_waiting_bcn = false;
if (sdata->deflink.csa_block_tx) {
if (sdata->csa_blocked_tx) {
ieee80211_wake_vif_queues(local, sdata,
IEEE80211_QUEUE_STOP_REASON_CSA);
sdata->deflink.csa_block_tx = false;
sdata->csa_blocked_tx = false;
}
wiphy_work_cancel(local->hw.wiphy, &sdata->deflink.csa_finalize_work);

35
net/mac80211/mlme.c
View File

@ -1926,10 +1926,10 @@ static void ieee80211_chswitch_post_beacon(struct ieee80211_link_data *link)
WARN_ON(!link->conf->csa_active);
if (link->csa_block_tx) {
if (sdata->csa_blocked_tx) {
ieee80211_wake_vif_queues(local, sdata,
IEEE80211_QUEUE_STOP_REASON_CSA);
link->csa_block_tx = false;
sdata->csa_blocked_tx = false;
}
link->conf->csa_active = false;
@ -1997,11 +1997,12 @@ ieee80211_sta_abort_chanswitch(struct ieee80211_link_data *link)
ieee80211_link_unreserve_chanctx(link);
if (link->csa_block_tx)
if (sdata->csa_blocked_tx) {
ieee80211_wake_vif_queues(local, sdata,
IEEE80211_QUEUE_STOP_REASON_CSA);
sdata->csa_blocked_tx = false;
}
link->csa_block_tx = false;
link->conf->csa_active = false;
drv_abort_channel_switch(link);
@ -2145,13 +2146,15 @@ ieee80211_sta_process_chanswitch(struct ieee80211_link_data *link,
link->conf->csa_active = true;
link->csa_chanreq = csa_ie.chanreq;
link->csa_block_tx = csa_ie.mode;
link->u.mgd.csa_ignored_same_chan = false;
link->u.mgd.beacon_crc_valid = false;
if (link->csa_block_tx)
if (csa_ie.mode &&
!ieee80211_hw_check(&local->hw, HANDLES_QUIET_CSA)) {
ieee80211_stop_vif_queues(local, sdata,
IEEE80211_QUEUE_STOP_REASON_CSA);
sdata->csa_blocked_tx = true;
}
cfg80211_ch_switch_started_notify(sdata->dev, &csa_ie.chanreq.oper,
link->link_id, csa_ie.count,
@ -2179,7 +2182,8 @@ ieee80211_sta_process_chanswitch(struct ieee80211_link_data *link,
* reset when the disconnection worker runs.
*/
link->conf->csa_active = true;
link->csa_block_tx = csa_ie.mode;
sdata->csa_blocked_tx =
csa_ie.mode && !ieee80211_hw_check(&local->hw, HANDLES_QUIET_CSA);
wiphy_work_queue(sdata->local->hw.wiphy,
&ifmgd->csa_connection_drop_work);
@ -3233,10 +3237,10 @@ static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
sdata->vif.bss_conf.csa_active = false;
sdata->deflink.u.mgd.csa_waiting_bcn = false;
sdata->deflink.u.mgd.csa_ignored_same_chan = false;
if (sdata->deflink.csa_block_tx) {
if (sdata->csa_blocked_tx) {
ieee80211_wake_vif_queues(local, sdata,
IEEE80211_QUEUE_STOP_REASON_CSA);
sdata->deflink.csa_block_tx = false;
sdata->csa_blocked_tx = false;
}
/* existing TX TSPEC sessions no longer exist */
@ -3549,9 +3553,12 @@ static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata)
if (!ifmgd->associated)
return;
/* in MLO assume we have a link where we can TX the frame */
tx = ieee80211_vif_is_mld(&sdata->vif) ||
!sdata->deflink.csa_block_tx;
/*
* MLO drivers should have HANDLES_QUIET_CSA, so that csa_blocked_tx
* is always false; if they don't then this may try to transmit the
* frame but queues will be stopped.
*/
tx = !sdata->csa_blocked_tx;
if (!ifmgd->driver_disconnect) {
unsigned int link_id;
@ -3584,10 +3591,10 @@ static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata)
/* the other links will be destroyed */
sdata->vif.bss_conf.csa_active = false;
sdata->deflink.u.mgd.csa_waiting_bcn = false;
if (sdata->deflink.csa_block_tx) {
if (sdata->csa_blocked_tx) {
ieee80211_wake_vif_queues(local, sdata,
IEEE80211_QUEUE_STOP_REASON_CSA);
sdata->deflink.csa_block_tx = false;
sdata->csa_blocked_tx = false;
}
ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), tx,