Author | Tokens | Token Proportion | Commits | Commit Proportion |
---|---|---|---|---|
Michal Kazior | 3498 | 42.19% | 18 | 11.61% |
Johannes Berg | 2801 | 33.78% | 77 | 49.68% |
Eliad Peller | 591 | 7.13% | 4 | 2.58% |
Luciano Coelho | 298 | 3.59% | 5 | 3.23% |
Simon Wunderlich | 239 | 2.88% | 4 | 2.58% |
Ilan Peer | 187 | 2.26% | 3 | 1.94% |
Mordechai Goodstein | 154 | 1.86% | 1 | 0.65% |
Arik Nemtsov | 100 | 1.21% | 4 | 2.58% |
Jiri Benc | 98 | 1.18% | 1 | 0.65% |
Felix Fietkau | 66 | 0.80% | 3 | 1.94% |
Thomas Pedersen | 57 | 0.69% | 3 | 1.94% |
Karl Beldan | 27 | 0.33% | 1 | 0.65% |
John W. Linville | 24 | 0.29% | 2 | 1.29% |
Jouni Malinen | 22 | 0.27% | 3 | 1.94% |
Emmanuel Grumbach | 20 | 0.24% | 2 | 1.29% |
Ayala Beker | 17 | 0.21% | 2 | 1.29% |
Anjaneyulu | 16 | 0.19% | 2 | 1.29% |
Andrei Otcheretianski | 14 | 0.17% | 1 | 0.65% |
Gregory Greenman | 10 | 0.12% | 1 | 0.65% |
Rostislav Lisovy | 9 | 0.11% | 2 | 1.29% |
Lorenzo Bianconi | 7 | 0.08% | 3 | 1.94% |
Meenakshi Venkataraman | 6 | 0.07% | 1 | 0.65% |
Daniel Drake | 6 | 0.07% | 1 | 0.65% |
Tamizh chelvam | 5 | 0.06% | 1 | 0.65% |
Ron Rindjunsky | 3 | 0.04% | 1 | 0.65% |
Kees Cook | 3 | 0.04% | 1 | 0.65% |
Michael Wu | 3 | 0.04% | 1 | 0.65% |
Gustavo A. R. Silva | 2 | 0.02% | 1 | 0.65% |
Ido Yariv | 2 | 0.02% | 1 | 0.65% |
Alina Friedrichsen | 2 | 0.02% | 1 | 0.65% |
Joe Perches | 1 | 0.01% | 1 | 0.65% |
Thomas Gleixner | 1 | 0.01% | 1 | 0.65% |
Janusz Dziedzic | 1 | 0.01% | 1 | 0.65% |
Stephen Hemminger | 1 | 0.01% | 1 | 0.65% |
Total | 8291 | 155 |
// SPDX-License-Identifier: GPL-2.0-only /* * mac80211 - channel management * Copyright 2020 - 2022 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_link_data *link; int num = 0; lockdep_assert_wiphy(local->hw.wiphy); list_for_each_entry(link, &ctx->assigned_links, assigned_chanctx_list) num++; return num; } static int ieee80211_chanctx_num_reserved(struct ieee80211_local *local, struct ieee80211_chanctx *ctx) { struct ieee80211_link_data *link; int num = 0; lockdep_assert_wiphy(local->hw.wiphy); list_for_each_entry(link, &ctx->reserved_links, 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_wiphy(local->hw.wiphy); 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_wiphy(local->hw.wiphy); return ieee80211_num_chanctx(local) < ieee80211_max_num_channels(local); } static struct ieee80211_chanctx * ieee80211_link_get_chanctx(struct ieee80211_link_data *link) { struct ieee80211_local *local __maybe_unused = link->sdata->local; struct ieee80211_chanctx_conf *conf; conf = rcu_dereference_protected(link->conf->chanctx_conf, lockdep_is_held(&local->hw.wiphy->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_link_data *link; lockdep_assert_wiphy(local->hw.wiphy); list_for_each_entry(link, &ctx->reserved_links, reserved_chanctx_list) { if (!compat) compat = &link->reserved_chandef; compat = cfg80211_chandef_compatible(&link->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_link_data *link; lockdep_assert_wiphy(local->hw.wiphy); list_for_each_entry(link, &ctx->assigned_links, assigned_chanctx_list) { struct ieee80211_bss_conf *link_conf = link->conf; if (link->reserved_chanctx) continue; if (!compat) compat = &link_conf->chandef; compat = cfg80211_chandef_compatible( &link_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_wiphy(local->hw.wiphy); 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_wiphy(local->hw.wiphy); if (ieee80211_chanctx_combined_chandef(local, ctx, def)) return true; if (!list_empty(&ctx->reserved_links) && 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_wiphy(local->hw.wiphy); 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, unsigned int link_id) { enum ieee80211_sta_rx_bandwidth width; struct link_sta_info *link_sta; link_sta = rcu_dereference(sta->link[link_id]); /* no effect if this STA has no presence on this link */ if (!link_sta) return NL80211_CHAN_WIDTH_20_NOHT; width = ieee80211_sta_cap_rx_bw(link_sta); switch (width) { case IEEE80211_STA_RX_BW_20: if (link_sta->pub->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; case IEEE80211_STA_RX_BW_320: return NL80211_CHAN_WIDTH_320; 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, unsigned int link_id) { enum nl80211_chan_width max_bw = NL80211_CHAN_WIDTH_20_NOHT; struct sta_info *sta; 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, link_id)); } return max_bw; } static enum nl80211_chan_width ieee80211_get_chanctx_vif_max_required_bw(struct ieee80211_sub_if_data *sdata, struct ieee80211_chanctx *ctx, struct ieee80211_link_data *rsvd_for) { enum nl80211_chan_width max_bw = NL80211_CHAN_WIDTH_20_NOHT; struct ieee80211_vif *vif = &sdata->vif; int link_id; rcu_read_lock(); for (link_id = 0; link_id < ARRAY_SIZE(sdata->link); link_id++) { enum nl80211_chan_width width = NL80211_CHAN_WIDTH_20_NOHT; struct ieee80211_link_data *link = rcu_dereference(sdata->link[link_id]); if (!link) continue; if (link != rsvd_for && rcu_access_pointer(link->conf->chanctx_conf) != &ctx->conf) continue; switch (vif->type) { case NL80211_IFTYPE_AP: case NL80211_IFTYPE_AP_VLAN: width = ieee80211_get_max_required_bw(sdata, link_id); 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(link->conf->chandef.width, ieee80211_get_max_required_bw(sdata, link_id)); 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 = link->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); } rcu_read_unlock(); return max_bw; } static enum nl80211_chan_width ieee80211_get_chanctx_max_required_bw(struct ieee80211_local *local, struct ieee80211_chanctx *ctx, struct ieee80211_link_data *rsvd_for) { 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) { enum nl80211_chan_width width; if (!ieee80211_sdata_running(sdata)) continue; width = ieee80211_get_chanctx_vif_max_required_bw(sdata, ctx, rsvd_for); 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.bss_conf.chanctx_conf) == &ctx->conf) max_bw = max(max_bw, ctx->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, struct ieee80211_link_data *rsvd_for) { enum nl80211_chan_width max_bw; struct cfg80211_chan_def min_def; lockdep_assert_wiphy(local->hw.wiphy); /* 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, rsvd_for); /* 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_link_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) { struct ieee80211_sub_if_data *sdata = sta->sdata; enum ieee80211_sta_rx_bandwidth new_sta_bw; unsigned int link_id; if (!ieee80211_sdata_running(sta->sdata)) continue; for (link_id = 0; link_id < ARRAY_SIZE(sta->sdata->link); link_id++) { struct ieee80211_bss_conf *link_conf = rcu_dereference(sdata->vif.link_conf[link_id]); struct link_sta_info *link_sta; if (!link_conf) continue; if (rcu_access_pointer(link_conf->chanctx_conf) != &ctx->conf) continue; link_sta = rcu_dereference(sta->link[link_id]); if (!link_sta) continue; new_sta_bw = ieee80211_sta_cur_vht_bw(link_sta); /* nothing change */ if (new_sta_bw == link_sta->pub->bandwidth) continue; /* vif changed to narrow BW and narrow BW for station wasn't * requested or vise versa */ if ((new_sta_bw < link_sta->pub->bandwidth) == !narrowed) continue; link_sta->pub->bandwidth = new_sta_bw; rate_control_rate_update(local, sband, sta, link_id, 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, struct ieee80211_link_data *rsvd_for) { u32 changed = _ieee80211_recalc_chanctx_min_def(local, ctx, rsvd_for); 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, struct ieee80211_link_data *rsvd_for) { u32 changed; /* expected to handle only 20/40/80/160/320 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: case NL80211_CHAN_WIDTH_320: 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, rsvd_for); 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, rsvd_for); 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 void ieee80211_change_chanctx(struct ieee80211_local *local, struct ieee80211_chanctx *ctx, struct ieee80211_chanctx *old_ctx, const struct cfg80211_chan_def *chandef) { _ieee80211_change_chanctx(local, ctx, old_ctx, chandef, NULL); } 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_wiphy(local->hw.wiphy); 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_wiphy(local->hw.wiphy); rcu_read_lock(); list_for_each_entry_rcu(sdata, &local->interfaces, list) { unsigned int link_id; for (link_id = 0; link_id < ARRAY_SIZE(sdata->link); link_id++) { struct ieee80211_link_data *link; link = rcu_dereference(sdata->link[link_id]); if (link && link->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_wiphy(local->hw.wiphy); rcu_read_lock(); list_for_each_entry_rcu(sdata, &local->interfaces, list) { unsigned int link_id; if (!ieee80211_sdata_running(sdata)) continue; for (link_id = 0; link_id < ARRAY_SIZE(sdata->link); link_id++) { struct ieee80211_link_data *link; link = rcu_dereference(sdata->link[link_id]); if (!link) continue; if (rcu_access_pointer(link->conf->chanctx_conf) != conf) continue; if (!link->radar_required) continue; required = true; break; } if (required) 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_wiphy(local->hw.wiphy); ctx = kzalloc(sizeof(*ctx) + local->hw.chanctx_data_size, GFP_KERNEL); if (!ctx) return NULL; INIT_LIST_HEAD(&ctx->assigned_links); INIT_LIST_HEAD(&ctx->reserved_links); 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, NULL); return ctx; } static int ieee80211_add_chanctx(struct ieee80211_local *local, struct ieee80211_chanctx *ctx) { u32 changed; int err; lockdep_assert_wiphy(local->hw.wiphy); 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_wiphy(local->hw.wiphy); 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_wiphy(local->hw.wiphy); 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_wiphy(local->hw.wiphy); 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_wiphy(local->hw.wiphy); rcu_read_lock(); list_for_each_entry_rcu(sdata, &local->interfaces, list) { int link_id; if (!ieee80211_sdata_running(sdata)) continue; if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) continue; for (link_id = 0; link_id < ARRAY_SIZE(sdata->link); link_id++) { struct ieee80211_bss_conf *link_conf = rcu_dereference(sdata->vif.link_conf[link_id]); if (!link_conf) continue; if (rcu_access_pointer(link_conf->chanctx_conf) != conf) continue; if (!compat) compat = &link_conf->chandef; compat = cfg80211_chandef_compatible(&link_conf->chandef, compat); if (WARN_ON_ONCE(!compat)) break; } } if (WARN_ON_ONCE(!compat)) { rcu_read_unlock(); return; } /* 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_wiphy(local->hw.wiphy); 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_link_chanctx(struct ieee80211_link_data *link, struct ieee80211_chanctx *new_ctx) { struct ieee80211_sub_if_data *sdata = link->sdata; 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(link->conf->chanctx_conf, lockdep_is_held(&local->hw.wiphy->mtx)); if (conf) { curr_ctx = container_of(conf, struct ieee80211_chanctx, conf); drv_unassign_vif_chanctx(local, sdata, link->conf, curr_ctx); conf = NULL; list_del(&link->assigned_chanctx_list); } if (new_ctx) { /* recalc considering the link we'll use it for now */ ieee80211_recalc_chanctx_min_def(local, new_ctx, link); ret = drv_assign_vif_chanctx(local, sdata, link->conf, new_ctx); if (ret) goto out; conf = &new_ctx->conf; list_add(&link->assigned_chanctx_list, &new_ctx->assigned_links); } out: rcu_assign_pointer(link->conf->chanctx_conf, conf); sdata->vif.cfg.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, NULL); } if (new_ctx && ieee80211_chanctx_num_assigned(local, new_ctx) > 0) { ieee80211_recalc_txpower(sdata, false); ieee80211_recalc_chanctx_min_def(local, new_ctx, NULL); } if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE && sdata->vif.type != NL80211_IFTYPE_MONITOR) ieee80211_vif_cfg_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_wiphy(local->hw.wiphy); 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; unsigned int link_id; if (!ieee80211_sdata_running(sdata)) continue; switch (sdata->vif.type) { case NL80211_IFTYPE_STATION: if (!sdata->u.mgd.associated) continue; break; case NL80211_IFTYPE_AP: case NL80211_IFTYPE_ADHOC: case NL80211_IFTYPE_MESH_POINT: case NL80211_IFTYPE_OCB: break; default: continue; } for (link_id = 0; link_id < ARRAY_SIZE(sdata->link); link_id++) { struct ieee80211_link_data *link; link = rcu_dereference(sdata->link[link_id]); if (!link) continue; if (rcu_access_pointer(link->conf->chanctx_conf) != &chanctx->conf) continue; switch (link->smps_mode) { default: WARN_ONCE(1, "Invalid SMPS mode %d\n", link->smps_mode); fallthrough; case IEEE80211_SMPS_OFF: needed_static = link->needed_rx_chains; needed_dynamic = link->needed_rx_chains; break; case IEEE80211_SMPS_DYNAMIC: needed_static = 1; needed_dynamic = link->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.bss_conf.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_link_copy_chanctx_to_vlans(struct ieee80211_link_data *link, bool clear) { struct ieee80211_sub_if_data *sdata = link->sdata; unsigned int link_id = link->link_id; struct ieee80211_bss_conf *link_conf = link->conf; 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_wiphy(local->hw.wiphy); /* 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(link_conf->chanctx_conf, lockdep_is_held(&local->hw.wiphy->mtx)); WARN_ON(!conf); if (clear) conf = NULL; rcu_read_lock(); list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) { struct ieee80211_bss_conf *vlan_conf; vlan_conf = rcu_dereference(vlan->vif.link_conf[link_id]); if (WARN_ON(!vlan_conf)) continue; rcu_assign_pointer(vlan_conf->chanctx_conf, conf); } rcu_read_unlock(); } void ieee80211_link_copy_chanctx_to_vlans(struct ieee80211_link_data *link, bool clear) { struct ieee80211_local *local = link->sdata->local; lockdep_assert_wiphy(local->hw.wiphy); __ieee80211_link_copy_chanctx_to_vlans(link, clear); } int ieee80211_link_unreserve_chanctx(struct ieee80211_link_data *link) { struct ieee80211_sub_if_data *sdata = link->sdata; struct ieee80211_chanctx *ctx = link->reserved_chanctx; lockdep_assert_wiphy(sdata->local->hw.wiphy); if (WARN_ON(!ctx)) return -EINVAL; list_del(&link->reserved_chanctx_list); link->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_link_reserve_chanctx(struct ieee80211_link_data *link, const struct cfg80211_chan_def *chandef, enum ieee80211_chanctx_mode mode, bool radar_required) { struct ieee80211_sub_if_data *sdata = link->sdata; struct ieee80211_local *local = sdata->local; struct ieee80211_chanctx *new_ctx, *curr_ctx, *ctx; lockdep_assert_wiphy(local->hw.wiphy); curr_ctx = ieee80211_link_get_chanctx(link); 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_links)) { /* * Another link already requested this context * for a reservation. Find another one hoping * all links 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, link1..6, each ctx has 2 * links. link1 and link2 from ctx1 request new * different chandefs starting 2 in-place * reserations with ctx4 and ctx5 replacing * ctx1 and ctx2 respectively. Next link5 and * link6 from ctx3 reserve ctx4. If link3 and * link4 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_links)) 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_links)) 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(&link->reserved_chanctx_list, &new_ctx->reserved_links); link->reserved_chanctx = new_ctx; link->reserved_chandef = *chandef; link->reserved_radar_required = radar_required; link->reserved_ready = false; return 0; } static void ieee80211_link_chanctx_reservation_complete(struct ieee80211_link_data *link) { struct ieee80211_sub_if_data *sdata = link->sdata; switch (sdata->vif.type) { case NL80211_IFTYPE_ADHOC: case NL80211_IFTYPE_AP: case NL80211_IFTYPE_MESH_POINT: case NL80211_IFTYPE_OCB: wiphy_work_queue(sdata->local->hw.wiphy, &link->csa_finalize_work); break; case NL80211_IFTYPE_STATION: wiphy_delayed_work_queue(sdata->local->hw.wiphy, &link->u.mgd.chswitch_work, 0); 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_link_update_chandef(struct ieee80211_link_data *link, const struct cfg80211_chan_def *chandef) { struct ieee80211_sub_if_data *sdata = link->sdata; unsigned int link_id = link->link_id; struct ieee80211_sub_if_data *vlan; link->conf->chandef = *chandef; if (sdata->vif.type != NL80211_IFTYPE_AP) return; rcu_read_lock(); list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list) { struct ieee80211_bss_conf *vlan_conf; vlan_conf = rcu_dereference(vlan->vif.link_conf[link_id]); if (WARN_ON(!vlan_conf)) continue; vlan_conf->chandef = *chandef; } rcu_read_unlock(); } static int ieee80211_link_use_reserved_reassign(struct ieee80211_link_data *link) { struct ieee80211_sub_if_data *sdata = link->sdata; struct ieee80211_bss_conf *link_conf = link->conf; 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; u64 changed = 0; int err; lockdep_assert_wiphy(local->hw.wiphy); new_ctx = link->reserved_chanctx; old_ctx = ieee80211_link_get_chanctx(link); if (WARN_ON(!link->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, &link->reserved_chandef); if (WARN_ON(!chandef)) return -EINVAL; if (link_conf->chandef.width != link->reserved_chandef.width) changed = BSS_CHANGED_BANDWIDTH; ieee80211_link_update_chandef(link, &link->reserved_chandef); _ieee80211_change_chanctx(local, new_ctx, old_ctx, chandef, link); vif_chsw[0].vif = &sdata->vif; vif_chsw[0].old_ctx = &old_ctx->conf; vif_chsw[0].new_ctx = &new_ctx->conf; vif_chsw[0].link_conf = link->conf; list_del(&link->reserved_chanctx_list); link->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(&link->assigned_chanctx_list, &new_ctx->assigned_links); rcu_assign_pointer(link_conf->chanctx_conf, &new_ctx->conf); if (sdata->vif.type == NL80211_IFTYPE_AP) __ieee80211_link_copy_chanctx_to_vlans(link, 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, NULL); ieee80211_recalc_smps_chanctx(local, new_ctx); ieee80211_recalc_radar_chanctx(local, new_ctx); if (changed) ieee80211_link_info_change_notify(sdata, link, changed); out: ieee80211_link_chanctx_reservation_complete(link); return err; } static int ieee80211_link_use_reserved_assign(struct ieee80211_link_data *link) { struct ieee80211_sub_if_data *sdata = link->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_link_get_chanctx(link); new_ctx = link->reserved_chanctx; if (WARN_ON(!link->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, &link->reserved_chandef); if (WARN_ON(!chandef)) return -EINVAL; ieee80211_change_chanctx(local, new_ctx, new_ctx, chandef); list_del(&link->reserved_chanctx_list); link->reserved_chanctx = NULL; err = ieee80211_assign_link_chanctx(link, new_ctx); if (err) { if (ieee80211_chanctx_refcount(local, new_ctx) == 0) ieee80211_free_chanctx(local, new_ctx); goto out; } out: ieee80211_link_chanctx_reservation_complete(link); return err; } static bool ieee80211_link_has_in_place_reservation(struct ieee80211_link_data *link) { struct ieee80211_sub_if_data *sdata = link->sdata; struct ieee80211_chanctx *old_ctx, *new_ctx; lockdep_assert_wiphy(sdata->local->hw.wiphy); new_ctx = link->reserved_chanctx; old_ctx = ieee80211_link_get_chanctx(link); 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_wiphy(local->hw.wiphy); 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_link_data *link; struct ieee80211_chanctx *ctx, *old_ctx; int i, err; lockdep_assert_wiphy(local->hw.wiphy); 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(link, &ctx->reserved_links, reserved_chanctx_list) { if (!ieee80211_link_has_in_place_reservation(link)) continue; old_ctx = ieee80211_link_get_chanctx(link); vif_chsw[i].vif = &link->sdata->vif; vif_chsw[i].old_ctx = &old_ctx->conf; vif_chsw[i].new_ctx = &ctx->conf; vif_chsw[i].link_conf = link->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_wiphy(local->hw.wiphy); 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_links)) 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_links)) 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_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_wiphy(local->hw.wiphy); /* * 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) { struct ieee80211_link_data *link; 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(link, &ctx->replace_ctx->assigned_links, assigned_chanctx_list) { n_assigned++; if (link->reserved_chanctx) { n_reserved++; if (link->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(link, &ctx->reserved_links, reserved_chanctx_list) { if (ieee80211_link_has_in_place_reservation(link) && !link->reserved_ready) return -EAGAIN; old_ctx = ieee80211_link_get_chanctx(link); 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 (link->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) { struct ieee80211_link_data *link, *link_tmp; if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER) continue; if (WARN_ON(!ctx->replace_ctx)) { err = -EINVAL; goto err; } list_for_each_entry(link, &ctx->reserved_links, reserved_chanctx_list) { struct ieee80211_sub_if_data *sdata = link->sdata; struct ieee80211_bss_conf *link_conf = link->conf; u64 changed = 0; if (!ieee80211_link_has_in_place_reservation(link)) continue; rcu_assign_pointer(link_conf->chanctx_conf, &ctx->conf); if (sdata->vif.type == NL80211_IFTYPE_AP) __ieee80211_link_copy_chanctx_to_vlans(link, false); ieee80211_check_fast_xmit_iface(sdata); link->radar_required = link->reserved_radar_required; if (link_conf->chandef.width != link->reserved_chandef.width) changed = BSS_CHANGED_BANDWIDTH; ieee80211_link_update_chandef(link, &link->reserved_chandef); if (changed) ieee80211_link_info_change_notify(sdata, link, 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, NULL); list_for_each_entry_safe(link, link_tmp, &ctx->reserved_links, reserved_chanctx_list) { if (ieee80211_link_get_chanctx(link) != ctx) continue; list_del(&link->reserved_chanctx_list); list_move(&link->assigned_chanctx_list, &ctx->assigned_links); link->reserved_chanctx = NULL; ieee80211_link_chanctx_reservation_complete(link); } /* * 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(link, link_tmp, &ctx->reserved_links, reserved_chanctx_list) { if (WARN_ON(ieee80211_link_has_in_place_reservation(link))) continue; if (WARN_ON(link->reserved_chanctx != ctx)) continue; if (!link->reserved_ready) continue; if (ieee80211_link_get_chanctx(link)) err = ieee80211_link_use_reserved_reassign(link); else err = ieee80211_link_use_reserved_assign(link); if (err) { link_info(link, "failed to finalize (re-)assign reservation (err=%d)\n", err); ieee80211_link_unreserve_chanctx(link); cfg80211_stop_iface(local->hw.wiphy, &link->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) { struct ieee80211_link_data *link, *link_tmp; if (ctx->replace_state != IEEE80211_CHANCTX_REPLACES_OTHER) continue; list_for_each_entry_safe(link, link_tmp, &ctx->reserved_links, reserved_chanctx_list) { ieee80211_link_unreserve_chanctx(link); ieee80211_link_chanctx_reservation_complete(link); } } return err; } static void __ieee80211_link_release_channel(struct ieee80211_link_data *link) { struct ieee80211_sub_if_data *sdata = link->sdata; struct ieee80211_bss_conf *link_conf = link->conf; struct ieee80211_local *local = sdata->local; struct ieee80211_chanctx_conf *conf; struct ieee80211_chanctx *ctx; bool use_reserved_switch = false; lockdep_assert_wiphy(local->hw.wiphy); conf = rcu_dereference_protected(link_conf->chanctx_conf, lockdep_is_held(&local->hw.wiphy->mtx)); if (!conf) return; ctx = container_of(conf, struct ieee80211_chanctx, conf); if (link->reserved_chanctx) { if (link->reserved_chanctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER && ieee80211_chanctx_num_reserved(local, link->reserved_chanctx) > 1) use_reserved_switch = true; ieee80211_link_unreserve_chanctx(link); } ieee80211_assign_link_chanctx(link, NULL); if (ieee80211_chanctx_refcount(local, ctx) == 0) ieee80211_free_chanctx(local, ctx); link->radar_required = false; /* Unreserving may ready an in-place reservation. */ if (use_reserved_switch) ieee80211_vif_use_reserved_switch(local); } int ieee80211_link_use_channel(struct ieee80211_link_data *link, const struct cfg80211_chan_def *chandef, enum ieee80211_chanctx_mode mode) { struct ieee80211_sub_if_data *sdata = link->sdata; struct ieee80211_local *local = sdata->local; struct ieee80211_chanctx *ctx; u8 radar_detect_width = 0; int ret; lockdep_assert_wiphy(local->hw.wiphy); if (sdata->vif.active_links && !(sdata->vif.active_links & BIT(link->link_id))) { ieee80211_link_update_chandef(link, chandef); return 0; } 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); link->radar_required = ret; ret = ieee80211_check_combinations(sdata, chandef, mode, radar_detect_width); if (ret < 0) goto out; __ieee80211_link_release_channel(link); 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_link_update_chandef(link, chandef); ret = ieee80211_assign_link_chanctx(link, 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) link->radar_required = false; return ret; } int ieee80211_link_use_reserved_context(struct ieee80211_link_data *link) { struct ieee80211_sub_if_data *sdata = link->sdata; struct ieee80211_local *local = sdata->local; struct ieee80211_chanctx *new_ctx; struct ieee80211_chanctx *old_ctx; int err; lockdep_assert_wiphy(local->hw.wiphy); new_ctx = link->reserved_chanctx; old_ctx = ieee80211_link_get_chanctx(link); if (WARN_ON(!new_ctx)) return -EINVAL; if (WARN_ON(new_ctx->replace_state == IEEE80211_CHANCTX_WILL_BE_REPLACED)) return -EINVAL; if (WARN_ON(link->reserved_ready)) return -EINVAL; link->reserved_ready = true; if (new_ctx->replace_state == IEEE80211_CHANCTX_REPLACE_NONE) { if (old_ctx) return ieee80211_link_use_reserved_reassign(link); return ieee80211_link_use_reserved_assign(link); } /* * 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_link_change_bandwidth(struct ieee80211_link_data *link, const struct cfg80211_chan_def *chandef, u64 *changed) { struct ieee80211_sub_if_data *sdata = link->sdata; struct ieee80211_bss_conf *link_conf = link->conf; struct ieee80211_local *local = sdata->local; struct ieee80211_chanctx_conf *conf; struct ieee80211_chanctx *ctx; const struct cfg80211_chan_def *compat; lockdep_assert_wiphy(local->hw.wiphy); if (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef, IEEE80211_CHAN_DISABLED)) return -EINVAL; if (cfg80211_chandef_identical(chandef, &link_conf->chandef)) return 0; if (chandef->width == NL80211_CHAN_WIDTH_20_NOHT || link_conf->chandef.width == NL80211_CHAN_WIDTH_20_NOHT) return -EINVAL; conf = rcu_dereference_protected(link_conf->chanctx_conf, lockdep_is_held(&local->hw.wiphy->mtx)); if (!conf) return -EINVAL; ctx = container_of(conf, struct ieee80211_chanctx, conf); compat = cfg80211_chandef_compatible(&conf->def, chandef); if (!compat) return -EINVAL; switch (ctx->replace_state) { case IEEE80211_CHANCTX_REPLACE_NONE: if (!ieee80211_chanctx_reserved_chandef(local, ctx, compat)) return -EBUSY; break; case IEEE80211_CHANCTX_WILL_BE_REPLACED: /* TODO: Perhaps the bandwidth change could be treated as a * reservation itself? */ return -EBUSY; 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_link_update_chandef(link, chandef); ieee80211_recalc_chanctx_chantype(local, ctx); *changed |= BSS_CHANGED_BANDWIDTH; return 0; } void ieee80211_link_release_channel(struct ieee80211_link_data *link) { struct ieee80211_sub_if_data *sdata = link->sdata; lockdep_assert_wiphy(sdata->local->hw.wiphy); if (rcu_access_pointer(link->conf->chanctx_conf)) __ieee80211_link_release_channel(link); } void ieee80211_link_vlan_copy_chanctx(struct ieee80211_link_data *link) { struct ieee80211_sub_if_data *sdata = link->sdata; unsigned int link_id = link->link_id; struct ieee80211_bss_conf *link_conf = link->conf; struct ieee80211_bss_conf *ap_conf; struct ieee80211_local *local = sdata->local; struct ieee80211_sub_if_data *ap; struct ieee80211_chanctx_conf *conf; lockdep_assert_wiphy(local->hw.wiphy); 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); rcu_read_lock(); ap_conf = rcu_dereference(ap->vif.link_conf[link_id]); conf = rcu_dereference_protected(ap_conf->chanctx_conf, lockdep_is_held(&local->hw.wiphy->mtx)); rcu_assign_pointer(link_conf->chanctx_conf, conf); rcu_read_unlock(); } 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);
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