From patchwork Thu Jun 25 11:15:24 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Emmanuel Grumbach X-Patchwork-Id: 11624901 X-Patchwork-Delegate: johannes@sipsolutions.net Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 323A5913 for ; Thu, 25 Jun 2020 11:15:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 115F720781 for ; Thu, 25 Jun 2020 11:15:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2404201AbgFYLPa (ORCPT ); Thu, 25 Jun 2020 07:15:30 -0400 Received: from mga11.intel.com ([192.55.52.93]:27499 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2404195AbgFYLP3 (ORCPT ); Thu, 25 Jun 2020 07:15:29 -0400 IronPort-SDR: HJsnwG4a0RJkd6jaQFgceoOBF7CzJG4oCGySP/u4V1yBQLM9vg751Uu70QCnEQDOMFIwkUDYaZ iR+O9MKY2Qww== X-IronPort-AV: E=McAfee;i="6000,8403,9662"; a="143082221" X-IronPort-AV: E=Sophos;i="5.75,279,1589266800"; d="scan'208";a="143082221" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga004.jf.intel.com ([10.7.209.38]) by fmsmga102.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 25 Jun 2020 04:15:29 -0700 IronPort-SDR: of9TehtZ1pMxuW6CMNd0rcyc3eskj7i5VSr6hoYfmZBavnqc1Cb5G8pczyHU4Ij0z8VVnyFeQp RAJQ97UdSBFw== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.75,279,1589266800"; d="scan'208";a="423703718" Received: from kbergman-mobl.ger.corp.intel.com (HELO egrumbac-mobl1.ger.corp.intel.com) ([10.249.94.147]) by orsmga004.jf.intel.com with ESMTP; 25 Jun 2020 04:15:27 -0700 From: Emmanuel Grumbach To: johannes@sipsolutions.net Cc: linux-wireless@vger.kernel.org, Emmanuel Grumbach Subject: [PATCH v2] cfg80211: allow the low level driver to flush the BSS table Date: Thu, 25 Jun 2020 14:15:24 +0300 Message-Id: <20200625111524.3992-1-emmanuel.grumbach@intel.com> X-Mailer: git-send-email 2.17.1 Sender: linux-wireless-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org The low level driver adds its own opaque information in the BSS table in the cfg80211_bss structure. The low level driver may need to signal that this information is no longer relevant and needs to be recreated. Add an API to allow the low level driver to do that. iwlwifi needs this because it keeps there an information about the firmware's internal clock. This is kept in mac80211's struct ieee80211_bss::sync_device_ts. This information is populated while we scan, we add the internal firmware's clock to each beacon which allows us to program the firmware correctly after association so that it'll know when (in terms of its internal clock) the DTIM and TBTT will happen. When the firmware is reset this internal clock is reset as well and ieee80211_bss::sync_device_ts is no longer accurate. iwlwifi will call this new API any time the firmware is started. Signed-off-by: Emmanuel Grumbach --- v2: do not flush the BSS table upon suspend, and rewrite the commit message --- include/net/cfg80211.h | 6 ++++++ net/wireless/scan.c | 10 ++++++++++ 2 files changed, 16 insertions(+) diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h index fc7e8807838d..03a72b5b1986 100644 --- a/include/net/cfg80211.h +++ b/include/net/cfg80211.h @@ -7882,4 +7882,10 @@ void cfg80211_update_owe_info_event(struct net_device *netdev, struct cfg80211_update_owe_info *owe_info, gfp_t gfp); +/** + * cfg80211_bss_flush - resets all the scan entries + * @wiphy: the wiphy + */ +void cfg80211_bss_flush(struct wiphy *wiphy); + #endif /* __NET_CFG80211_H */ diff --git a/net/wireless/scan.c b/net/wireless/scan.c index 74ea4cfb39fb..e67a74488bbe 100644 --- a/net/wireless/scan.c +++ b/net/wireless/scan.c @@ -712,6 +712,16 @@ void cfg80211_bss_expire(struct cfg80211_registered_device *rdev) __cfg80211_bss_expire(rdev, jiffies - IEEE80211_SCAN_RESULT_EXPIRE); } +void cfg80211_bss_flush(struct wiphy *wiphy) +{ + struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); + + spin_lock_bh(&rdev->bss_lock); + __cfg80211_bss_expire(rdev, jiffies); + spin_unlock_bh(&rdev->bss_lock); +} +EXPORT_SYMBOL(cfg80211_bss_flush); + const struct element * cfg80211_find_elem_match(u8 eid, const u8 *ies, unsigned int len, const u8 *match, unsigned int match_len,