Date: Wed, 29 Nov 2023 16:38:37 GMT From: "Bjoern A. Zeeb" <bz@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org Subject: git: 6b816fdfada1 - stable/13 - LinuxKPI: 802.11: fix problem removing sta Message-ID: <202311291638.3ATGcbBn046334@gitrepo.freebsd.org>
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The branch stable/13 has been updated by bz: URL: https://cgit.FreeBSD.org/src/commit/?id=6b816fdfada19b56750053c02f0c32f562a77b94 commit 6b816fdfada19b56750053c02f0c32f562a77b94 Author: Bjoern A. Zeeb <bz@FreeBSD.org> AuthorDate: 2023-09-30 07:59:48 +0000 Commit: Bjoern A. Zeeb <bz@FreeBSD.org> CommitDate: 2023-11-29 16:36:09 +0000 LinuxKPI: 802.11: fix problem removing sta Move the call to lkpi_disassoc() before the state change to IEEE80211_STA_NOTEXIST which will remove the sta (from firmware). Based on a comment it seems that originally we had to do it the other way round. iwlwifi(4) has a check and will silently not remove the sta from the firmware when vif->cfg.assoc is still set (see iwl_mvm_sta_del()). This leads to the LinuxKPI 802.11 code thinking the sta is gone as downward state changes by the mac80211 op (*sta_state)() may not fail. Once we try to assoc with a newly added station later, iwlwifi firmware will run into an assert having two ap_sta set on the same vif. We can observe that problem in iwlwifi(4) having __le32 sta_id = 1 instead of sta_id = 0 in iwl_mvm_sta_cfg_cmd{} on the HCMD. This should fix one of the most seen problems with iwlwifi(4), e.g., when running service netif restart wlan0 or service wpa_supplicant restart wlan0. Sponsored by: The FreeBSD Foundation (cherry picked from commit 16e688b2a403a3dbc05de3b9f8a3132838613790) --- sys/compat/linuxkpi/common/src/linux_80211.c | 37 ++++++++++++++-------------- 1 file changed, 18 insertions(+), 19 deletions(-) diff --git a/sys/compat/linuxkpi/common/src/linux_80211.c b/sys/compat/linuxkpi/common/src/linux_80211.c index 85ee4f22434c..54c7c5de6627 100644 --- a/sys/compat/linuxkpi/common/src/linux_80211.c +++ b/sys/compat/linuxkpi/common/src/linux_80211.c @@ -1426,6 +1426,15 @@ _lkpi_sta_assoc_to_down(struct ieee80211vap *vap, enum ieee80211_state nstate, i lkpi_lsta_dump(lsta, ni, __func__, __LINE__); + /* Update bss info (bss_info_changed) (assoc, aid, ..). */ + /* + * We need to do this now, before sta changes to IEEE80211_STA_NOTEXIST + * as otherwise drivers (iwlwifi at least) will silently not remove + * the sta from the firmware and when we will add a new one trigger + * a fw assert. + */ + lkpi_disassoc(sta, vif, lhw); + /* Adjust sta and change state (from NONE) to NOTEXIST. */ KASSERT(lsta != NULL, ("%s: ni %p lsta is NULL\n", __func__, ni)); KASSERT(lsta->state == IEEE80211_STA_NONE, ("%s: lsta %p state not " @@ -1435,15 +1444,8 @@ _lkpi_sta_assoc_to_down(struct ieee80211vap *vap, enum ieee80211_state nstate, i IMPROVE("do we need to undo the chan ctx?"); goto out; } -#if 0 - lsta->added_to_drv = false; /* mo manages. */ -#endif - lkpi_lsta_dump(lsta, ni, __func__, __LINE__); - - /* Update bss info (bss_info_changed) (assoc, aid, ..). */ - /* We need to do this now, can only do after sta is IEEE80211_STA_NOTEXIST. */ - lkpi_disassoc(sta, vif, lhw); + lkpi_lsta_dump(lsta, ni, __func__, __LINE__); /* sta no longer save to use. */ IMPROVE("Any bss_info changes to announce?"); bss_changed = 0; @@ -1887,6 +1889,13 @@ lkpi_sta_run_to_init(struct ieee80211vap *vap, enum ieee80211_state nstate, int lkpi_lsta_dump(lsta, ni, __func__, __LINE__); + /* Update bss info (bss_info_changed) (assoc, aid, ..). */ + /* + * One would expect this to happen when going off AUTHORIZED. + * See comment there; removes the sta from fw. + */ + lkpi_disassoc(sta, vif, lhw); + /* Adjust sta and change state (from NONE) to NOTEXIST. */ KASSERT(lsta != NULL, ("%s: ni %p lsta is NULL\n", __func__, ni)); KASSERT(lsta->state == IEEE80211_STA_NONE, ("%s: lsta %p state not " @@ -1896,18 +1905,8 @@ lkpi_sta_run_to_init(struct ieee80211vap *vap, enum ieee80211_state nstate, int IMPROVE("do we need to undo the chan ctx?"); goto out; } -#if 0 - lsta->added_to_drv = false; /* mo manages. */ -#endif - lkpi_lsta_dump(lsta, ni, __func__, __LINE__); - - /* Update bss info (bss_info_changed) (assoc, aid, ..). */ - /* - * One would expect this to happen when going off AUTHORIZED. - * See comment there; removes the sta from fw. - */ - lkpi_disassoc(sta, vif, lhw); + lkpi_lsta_dump(lsta, ni, __func__, __LINE__); /* sta no longer save to use. */ IMPROVE("Any bss_info changes to announce?"); bss_changed = 0;
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