From patchwork Tue Apr 16 10:54:07 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Korenblit, Miriam Rachel" X-Patchwork-Id: 790493 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C640B129E88 for ; Tue, 16 Apr 2024 10:54:43 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=192.198.163.17 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1713264885; cv=none; b=RkwyxR8qW81Iw1eG9GWzodPMvYXNsnlvXQe+3FdNEZWj8nj1eAB8xIO8GqCgUM3yonG6YWYXe/cMVp4GG/tLCceA1+6tqzs7fxGgP1dGI5Q59BcjcLC+KNp0oQreXdrRepF5b/+frqcHQFJHDDh9gPk72pMF5z4ZYK/SGEFsOw8= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1713264885; c=relaxed/simple; bh=aWbvrjGleNQOYvzUqMcG0J0NzG5Cv5W8aWNGL5WOjBU=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=nnzDGQ4FrnK7b6XdhsmkwBshb4f4CtrrWTyZckWXhfPL/oEFbRQIfVt7gyo4rx6aiudjfmQwEtti0Gks85hfNxCjZNqDGjO0cUjd+7UecxUNHjShqRhjNeAzAxd1wKW+g8axUMc5wbCeV/Lu3/a4r/cHR4Bc6La0koPJ4TOC/LQ= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com; spf=pass smtp.mailfrom=intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=cKNURtWF; arc=none smtp.client-ip=192.198.163.17 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="cKNURtWF" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1713264884; x=1744800884; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=aWbvrjGleNQOYvzUqMcG0J0NzG5Cv5W8aWNGL5WOjBU=; b=cKNURtWFHqSnIu0WOQZ9gAv1Qp2lJyEJt8yP81v7guapqjiXUyg3EF0V h4TPUMR64Iien8OCuFiVmWCzhR/xXqaL00ICyXRsxWx9wyyuMG8H5Af7q Rahx/PrvzQNfejLqCaP6+ul30H/pJkqvALgjwl8L4R0y1pzltpwMMBAxw 1u6Cc3TcoEulAxPEIlWVj1qBHaZu6OiWBRtUlWmWhZnFPst/4nVTV7rE8 jJF4CqKVQAfv5WpwBdxT1oh0tj6pFk0jbYz/499D44nmwpqFwcqvgxnRj 31VJVJpGmv5s0p9hUG5h9auNaZppxqqrV9T83bdbrsiuSjzhqIkNH+6yj w==; X-CSE-ConnectionGUID: f+k68XHtTwWi4yZumEPp9Q== X-CSE-MsgGUID: ucMY2EEbQRCnh9tRyWp3Sg== X-IronPort-AV: E=McAfee;i="6600,9927,11045"; a="8556063" X-IronPort-AV: E=Sophos;i="6.07,205,1708416000"; d="scan'208";a="8556063" Received: from fmviesa004.fm.intel.com ([10.60.135.144]) by fmvoesa111.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 16 Apr 2024 03:54:44 -0700 X-CSE-ConnectionGUID: Fui4OTt7RQ+urkh5D909jg== X-CSE-MsgGUID: z53rzBvbSvCzGB86MkiKaA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.07,205,1708416000"; d="scan'208";a="26872564" Received: from unknown (HELO WEIS0040.iil.intel.com) ([10.12.217.108]) by fmviesa004-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 16 Apr 2024 03:54:43 -0700 From: Miri Korenblit To: johannes@sipsolutions.net Cc: linux-wireless@vger.kernel.org, Johannes Berg Subject: [PATCH 12/16] wifi: iwlwifi: mvm: implement EMLSR prevention mechanism. Date: Tue, 16 Apr 2024 13:54:07 +0300 Message-Id: <20240416134215.d820ee98b300.I6406db40cf25eabdba602afd783466473b909216@changeid> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240416105411.706221-1-miriam.rachel.korenblit@intel.com> References: <20240416105411.706221-1-miriam.rachel.korenblit@intel.com> Precedence: bulk X-Mailing-List: linux-wireless@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Organization: Intel Israel (74) Limited Address scenarios where repeated entry and exit from EMLSR occur, such as encountering missed beacons on a specific link, while still discovering that link during a scan. To mitigate this, introduce the EMLSR prevention mechanism, which operates as follows: - On each exit from EMLSR event, record the timestamp and the exit reason. - If two consecutive exits happen for the same reason within a 400-second window, enforce a 300-second EMLSR prevention. - If a third exit for the same reason occurs within 400 seconds from the second exit, enforce an extended EMLSR prevention of 600 seconds. Signed-off-by: Miri Korenblit Reviewed-by: Johannes Berg --- drivers/net/wireless/intel/iwlwifi/mvm/link.c | 52 +++++++++++++++++++ .../net/wireless/intel/iwlwifi/mvm/mac80211.c | 25 +++++++++ drivers/net/wireless/intel/iwlwifi/mvm/mvm.h | 23 ++++++++ 3 files changed, 100 insertions(+) diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/link.c b/drivers/net/wireless/intel/iwlwifi/mvm/link.c index acbe8e6f14c8..4bb71a14ac3b 100644 --- a/drivers/net/wireless/intel/iwlwifi/mvm/link.c +++ b/drivers/net/wireless/intel/iwlwifi/mvm/link.c @@ -712,6 +712,55 @@ u8 iwl_mvm_get_other_link(struct ieee80211_vif *vif, u8 link_id) } } +/* Reasons that can cause esr prevention */ +#define IWL_MVM_ESR_PREVENT_REASONS IWL_MVM_ESR_EXIT_MISSED_BEACON +#define IWL_MVM_PREVENT_ESR_TIMEOUT (HZ * 400) +#define IWL_MVM_ESR_PREVENT_SHORT (HZ * 300) +#define IWL_MVM_ESR_PREVENT_LONG (HZ * 600) + +static void iwl_mvm_recalc_esr_prevention(struct iwl_mvm *mvm, + struct iwl_mvm_vif *mvmvif, + enum iwl_mvm_esr_state reason) +{ + unsigned long now = jiffies; + unsigned long delay; + bool timeout_expired = + time_after(now, mvmvif->last_esr_exit.ts + + IWL_MVM_PREVENT_ESR_TIMEOUT); + + if (WARN_ON(!(IWL_MVM_ESR_PREVENT_REASONS & reason))) + return; + + lockdep_assert_held(&mvm->mutex); + + mvmvif->last_esr_exit.ts = now; + + if (timeout_expired || + mvmvif->last_esr_exit.reason != reason) { + mvmvif->last_esr_exit.reason = reason; + mvmvif->exit_same_reason_count = 1; + return; + } + + mvmvif->exit_same_reason_count++; + if (WARN_ON(mvmvif->exit_same_reason_count < 2 || + mvmvif->exit_same_reason_count > 3)) + return; + + mvmvif->esr_disable_reason |= IWL_MVM_ESR_BLOCKED_PREVENTION; + + delay = mvmvif->exit_same_reason_count == 2 ? + IWL_MVM_ESR_PREVENT_SHORT : + IWL_MVM_ESR_PREVENT_LONG; + + IWL_DEBUG_INFO(mvm, + "Preventing EMLSR for %ld seconds due to %u exits with the reason 0x%x\n", + delay / HZ, mvmvif->exit_same_reason_count, reason); + + wiphy_delayed_work_queue(mvm->hw->wiphy, + &mvmvif->prevent_esr_done_wk, delay); +} + /* API to exit eSR mode */ void iwl_mvm_exit_esr(struct iwl_mvm *mvm, struct ieee80211_vif *vif, enum iwl_mvm_esr_state reason, @@ -738,6 +787,9 @@ void iwl_mvm_exit_esr(struct iwl_mvm *mvm, struct ieee80211_vif *vif, reason, vif->active_links, new_active_links); ieee80211_set_active_links_async(vif, new_active_links); + + if (IWL_MVM_ESR_PREVENT_REASONS & reason) + iwl_mvm_recalc_esr_prevention(mvm, mvmvif, reason); } void iwl_mvm_block_esr(struct iwl_mvm *mvm, struct ieee80211_vif *vif, diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c b/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c index efe9205a7cf2..ddf27e6d2df2 100644 --- a/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c +++ b/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c @@ -1612,6 +1612,19 @@ static int iwl_mvm_alloc_bcast_mcast_sta(struct iwl_mvm *mvm, IWL_STA_MULTICAST); } +static void iwl_mvm_prevent_esr_done_wk(struct wiphy *wiphy, + struct wiphy_work *wk) +{ + struct iwl_mvm_vif *mvmvif = + container_of(wk, struct iwl_mvm_vif, prevent_esr_done_wk.work); + struct iwl_mvm *mvm = mvmvif->mvm; + struct ieee80211_vif *vif = iwl_mvm_get_bss_vif(mvm); + + mutex_lock(&mvm->mutex); + iwl_mvm_unblock_esr(mvm, vif, IWL_MVM_ESR_BLOCKED_PREVENTION); + mutex_unlock(&mvm->mutex); +} + void iwl_mvm_mac_init_mvmvif(struct iwl_mvm *mvm, struct iwl_mvm_vif *mvmvif) { lockdep_assert_held(&mvm->mutex); @@ -1621,6 +1634,9 @@ void iwl_mvm_mac_init_mvmvif(struct iwl_mvm *mvm, struct iwl_mvm_vif *mvmvif) INIT_DELAYED_WORK(&mvmvif->csa_work, iwl_mvm_channel_switch_disconnect_wk); + + wiphy_delayed_work_init(&mvmvif->prevent_esr_done_wk, + iwl_mvm_prevent_esr_done_wk); } static int iwl_mvm_mac_add_interface(struct ieee80211_hw *hw, @@ -1764,6 +1780,9 @@ void iwl_mvm_prepare_mac_removal(struct iwl_mvm *mvm, flush_work(&mvm->roc_done_wk); } + wiphy_delayed_work_cancel(mvm->hw->wiphy, + &mvmvif->prevent_esr_done_wk); + cancel_delayed_work_sync(&mvmvif->csa_work); } @@ -3906,6 +3925,9 @@ iwl_mvm_sta_state_assoc_to_authorized(struct iwl_mvm *mvm, callbacks->mac_ctxt_changed(mvm, vif, false); iwl_mvm_mei_host_associated(mvm, vif, mvm_sta); + memset(&mvmvif->last_esr_exit, 0, + sizeof(mvmvif->last_esr_exit)); + /* Calculate eSR mode due to BT coex */ iwl_mvm_bt_coex_update_vif_esr(mvm, vif); @@ -3962,6 +3984,9 @@ iwl_mvm_sta_state_authorized_to_assoc(struct iwl_mvm *mvm, /* disable beacon filtering */ iwl_mvm_disable_beacon_filter(mvm, vif); + + wiphy_delayed_work_cancel(mvm->hw->wiphy, + &mvmvif->prevent_esr_done_wk); } return 0; diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/mvm.h b/drivers/net/wireless/intel/iwlwifi/mvm/mvm.h index 3f13b346bfc6..920fd0afbb59 100644 --- a/drivers/net/wireless/intel/iwlwifi/mvm/mvm.h +++ b/drivers/net/wireless/intel/iwlwifi/mvm/mvm.h @@ -354,15 +354,29 @@ struct iwl_mvm_vif_link_info { * reasons - use iwl_mvm_exit_esr(). * * @IWL_MVM_ESR_BLOCKED_COEX: COEX is preventing the enablement of EMLSR + * @IWL_MVM_ESR_BLOCKED_PREVENTION: Prevent EMLSR to avoid entering and exiting + * in a loop. * @IWL_MVM_ESR_EXIT_MISSED_BEACON: exited EMLSR due to missed beacons */ enum iwl_mvm_esr_state { IWL_MVM_ESR_BLOCKED_COEX = 0x1, + IWL_MVM_ESR_BLOCKED_PREVENTION = 0x2, IWL_MVM_ESR_EXIT_MISSED_BEACON = 0x10000, }; #define IWL_MVM_BLOCK_ESR_REASONS 0xffff +/** + * struct iwl_mvm_esr_exit - details of the last exit from EMLSR mode. + * @reason: The reason for the last exit from EMLSR. + * &iwl_mvm_prevent_esr_reasons. Will be 0 before exiting EMLSR. + * @ts: the time stamp of the last time we existed EMLSR. + */ +struct iwl_mvm_esr_exit { + unsigned long ts; + enum iwl_mvm_esr_state reason; +}; + /** * struct iwl_mvm_vif - data per Virtual Interface, it is a MAC context * @mvm: pointer back to the mvm struct @@ -404,6 +418,11 @@ enum iwl_mvm_esr_state { * @link_selection_primary: primary link selected by link selection * @primary_link: primary link in eSR. Valid only for an associated MLD vif, * and in eSR mode. Valid only for a STA. + * @last_esr_exit: Details of the last exit from EMLSR. + * @exit_same_reason_count: The number of times we exited due to the specified + * @last_esr_exit::reason, only counting exits due to + * &IWL_MVM_ESR_PREVENT_REASONS. + * @prevent_esr_done_wk: work that should be done when esr prevention ends. */ struct iwl_mvm_vif { struct iwl_mvm *mvm; @@ -497,6 +516,10 @@ struct iwl_mvm_vif { u16 link_selection_res; u8 link_selection_primary; u8 primary_link; + struct iwl_mvm_esr_exit last_esr_exit; + u8 exit_same_reason_count; + struct wiphy_delayed_work prevent_esr_done_wk; + struct iwl_mvm_vif_link_info deflink; struct iwl_mvm_vif_link_info *link[IEEE80211_MLD_MAX_NUM_LINKS]; };