From patchwork Mon May 30 13:54:52 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sascha Hauer X-Patchwork-Id: 12864685 X-Patchwork-Delegate: kvalo@adurom.com Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id E91A1C4332F for ; Mon, 30 May 2022 14:44:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241171AbiE3Ooe (ORCPT ); Mon, 30 May 2022 10:44:34 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57620 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S242462AbiE3OmU (ORCPT ); Mon, 30 May 2022 10:42:20 -0400 Received: from metis.ext.pengutronix.de (metis.ext.pengutronix.de [IPv6:2001:67c:670:201:290:27ff:fe1d:cc33]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 817FE14AC97 for ; Mon, 30 May 2022 06:55:14 -0700 (PDT) Received: from drehscheibe.grey.stw.pengutronix.de ([2a0a:edc0:0:c01:1d::a2]) by metis.ext.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1nvfrO-0007Ub-PZ; Mon, 30 May 2022 15:55:06 +0200 Received: from [2a0a:edc0:0:1101:1d::28] (helo=dude02.red.stw.pengutronix.de) by drehscheibe.grey.stw.pengutronix.de with esmtp (Exim 4.94.2) (envelope-from ) id 1nvfrO-005SmI-LG; Mon, 30 May 2022 15:55:05 +0200 Received: from sha by dude02.red.stw.pengutronix.de with local (Exim 4.94.2) (envelope-from ) id 1nvfrL-004dIZ-Hf; Mon, 30 May 2022 15:55:03 +0200 From: Sascha Hauer To: linux-wireless@vger.kernel.org Cc: Neo Jou , Hans Ulli Kroll , Ping-Ke Shih , Yan-Hsuan Chuang , Kalle Valo , netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Martin Blumenstingl , kernel@pengutronix.de, Johannes Berg , Sascha Hauer Subject: [PATCH v2 05/10] rtw88: iterate over vif/sta list non-atomically Date: Mon, 30 May 2022 15:54:52 +0200 Message-Id: <20220530135457.1104091-6-s.hauer@pengutronix.de> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220530135457.1104091-1-s.hauer@pengutronix.de> References: <20220530135457.1104091-1-s.hauer@pengutronix.de> MIME-Version: 1.0 X-SA-Exim-Connect-IP: 2a0a:edc0:0:c01:1d::a2 X-SA-Exim-Mail-From: sha@pengutronix.de X-SA-Exim-Scanned: No (on metis.ext.pengutronix.de); SAEximRunCond expanded to false X-PTX-Original-Recipient: linux-wireless@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org The driver uses ieee80211_iterate_active_interfaces_atomic() and ieee80211_iterate_stations_atomic() in several places and does register accesses in the iterators. This doesn't cope with upcoming USB support as registers can only be accessed non-atomically. Split these into a two stage process: First use the atomic iterator functions to collect all active interfaces or stations on a list, then iterate over the list non-atomically and call the iterator on each entry. Signed-off-by: Sascha Hauer Suggested-by: Pkshih --- Notes: Changes since v1: - Change subject - Add some lockdep_assert_held(&rtwdev->mutex); - make locally used functions static - Add comment how &rtwdev->mutex protects us from stations/interfaces being deleted between collecting them and iterating over them. drivers/net/wireless/realtek/rtw88/phy.c | 6 +- drivers/net/wireless/realtek/rtw88/ps.c | 2 +- drivers/net/wireless/realtek/rtw88/util.c | 103 ++++++++++++++++++++++ drivers/net/wireless/realtek/rtw88/util.h | 12 ++- 4 files changed, 116 insertions(+), 7 deletions(-) diff --git a/drivers/net/wireless/realtek/rtw88/phy.c b/drivers/net/wireless/realtek/rtw88/phy.c index e505d17f107e4..5521a7c2c1afe 100644 --- a/drivers/net/wireless/realtek/rtw88/phy.c +++ b/drivers/net/wireless/realtek/rtw88/phy.c @@ -300,7 +300,7 @@ static void rtw_phy_stat_rssi(struct rtw_dev *rtwdev) data.rtwdev = rtwdev; data.min_rssi = U8_MAX; - rtw_iterate_stas_atomic(rtwdev, rtw_phy_stat_rssi_iter, &data); + rtw_iterate_stas(rtwdev, rtw_phy_stat_rssi_iter, &data); dm_info->pre_min_rssi = dm_info->min_rssi; dm_info->min_rssi = data.min_rssi; @@ -544,7 +544,7 @@ static void rtw_phy_ra_info_update(struct rtw_dev *rtwdev) if (rtwdev->watch_dog_cnt & 0x3) return; - rtw_iterate_stas_atomic(rtwdev, rtw_phy_ra_info_update_iter, rtwdev); + rtw_iterate_stas(rtwdev, rtw_phy_ra_info_update_iter, rtwdev); } static u32 rtw_phy_get_rrsr_mask(struct rtw_dev *rtwdev, u8 rate_idx) @@ -597,7 +597,7 @@ static void rtw_phy_rrsr_update(struct rtw_dev *rtwdev) struct rtw_dm_info *dm_info = &rtwdev->dm_info; dm_info->rrsr_mask_min = RRSR_RATE_ORDER_MAX; - rtw_iterate_stas_atomic(rtwdev, rtw_phy_rrsr_mask_min_iter, rtwdev); + rtw_iterate_stas(rtwdev, rtw_phy_rrsr_mask_min_iter, rtwdev); rtw_write32(rtwdev, REG_RRSR, dm_info->rrsr_val_init & dm_info->rrsr_mask_min); } diff --git a/drivers/net/wireless/realtek/rtw88/ps.c b/drivers/net/wireless/realtek/rtw88/ps.c index bfa64c038f5f0..a7213ff2c2244 100644 --- a/drivers/net/wireless/realtek/rtw88/ps.c +++ b/drivers/net/wireless/realtek/rtw88/ps.c @@ -58,7 +58,7 @@ int rtw_leave_ips(struct rtw_dev *rtwdev) return ret; } - rtw_iterate_vifs_atomic(rtwdev, rtw_restore_port_cfg_iter, rtwdev); + rtw_iterate_vifs(rtwdev, rtw_restore_port_cfg_iter, rtwdev); rtw_coex_ips_notify(rtwdev, COEX_IPS_LEAVE); diff --git a/drivers/net/wireless/realtek/rtw88/util.c b/drivers/net/wireless/realtek/rtw88/util.c index 2c515af214e76..ed61c962fa27f 100644 --- a/drivers/net/wireless/realtek/rtw88/util.c +++ b/drivers/net/wireless/realtek/rtw88/util.c @@ -105,3 +105,106 @@ void rtw_desc_to_mcsrate(u16 rate, u8 *mcs, u8 *nss) *mcs = rate - DESC_RATEMCS0; } } + +struct rtw_stas_entry { + struct list_head list; + struct ieee80211_sta *sta; +}; + +struct rtw_iter_stas_data { + struct rtw_dev *rtwdev; + struct list_head list; +}; + +static void rtw_collect_sta_iter(void *data, struct ieee80211_sta *sta) +{ + struct rtw_iter_stas_data *iter_stas = data; + struct rtw_stas_entry *stas_entry; + + stas_entry = kmalloc(sizeof(*stas_entry), GFP_ATOMIC); + if (!stas_entry) + return; + + stas_entry->sta = sta; + list_add_tail(&stas_entry->list, &iter_stas->list); +} + +void rtw_iterate_stas(struct rtw_dev *rtwdev, + void (*iterator)(void *data, + struct ieee80211_sta *sta), + void *data) +{ + struct rtw_iter_stas_data iter_data; + struct rtw_stas_entry *sta_entry, *tmp; + + /* &rtwdev->mutex makes sure no stations can be removed between + * collecting the stations and iterating over them. + */ + lockdep_assert_held(&rtwdev->mutex); + + iter_data.rtwdev = rtwdev; + INIT_LIST_HEAD(&iter_data.list); + + ieee80211_iterate_stations_atomic(rtwdev->hw, rtw_collect_sta_iter, + &iter_data); + + list_for_each_entry_safe(sta_entry, tmp, &iter_data.list, + list) { + list_del_init(&sta_entry->list); + iterator(data, sta_entry->sta); + kfree(sta_entry); + } +} + +struct rtw_vifs_entry { + struct list_head list; + struct ieee80211_vif *vif; + u8 mac[ETH_ALEN]; +}; + +struct rtw_iter_vifs_data { + struct rtw_dev *rtwdev; + struct list_head list; +}; + +void rtw_collect_vif_iter(void *data, u8 *mac, struct ieee80211_vif *vif) +{ + struct rtw_iter_vifs_data *iter_stas = data; + struct rtw_vifs_entry *vifs_entry; + + vifs_entry = kmalloc(sizeof(*vifs_entry), GFP_ATOMIC); + if (!vifs_entry) + return; + + vifs_entry->vif = vif; + ether_addr_copy(vifs_entry->mac, mac); + list_add_tail(&vifs_entry->list, &iter_stas->list); +} + +void rtw_iterate_vifs(struct rtw_dev *rtwdev, + void (*iterator)(void *data, u8 *mac, + struct ieee80211_vif *vif), + void *data) +{ + struct rtw_iter_vifs_data iter_data; + struct rtw_vifs_entry *vif_entry, *tmp; + + /* &rtwdev->mutex makes sure no interfaces can be removed between + * collecting the interfaces and iterating over them. + */ + lockdep_assert_held(&rtwdev->mutex); + + iter_data.rtwdev = rtwdev; + INIT_LIST_HEAD(&iter_data.list); + + ieee80211_iterate_active_interfaces_atomic(rtwdev->hw, + IEEE80211_IFACE_ITER_NORMAL, + rtw_collect_vif_iter, &iter_data); + + list_for_each_entry_safe(vif_entry, tmp, &iter_data.list, + list) { + list_del_init(&vif_entry->list); + iterator(data, vif_entry->mac, vif_entry->vif); + kfree(vif_entry); + } +} diff --git a/drivers/net/wireless/realtek/rtw88/util.h b/drivers/net/wireless/realtek/rtw88/util.h index 0c23b5069be0b..dc89655254002 100644 --- a/drivers/net/wireless/realtek/rtw88/util.h +++ b/drivers/net/wireless/realtek/rtw88/util.h @@ -7,9 +7,6 @@ struct rtw_dev; -#define rtw_iterate_vifs(rtwdev, iterator, data) \ - ieee80211_iterate_active_interfaces(rtwdev->hw, \ - IEEE80211_IFACE_ITER_NORMAL, iterator, data) #define rtw_iterate_vifs_atomic(rtwdev, iterator, data) \ ieee80211_iterate_active_interfaces_atomic(rtwdev->hw, \ IEEE80211_IFACE_ITER_NORMAL, iterator, data) @@ -20,6 +17,15 @@ struct rtw_dev; #define rtw_iterate_keys_rcu(rtwdev, vif, iterator, data) \ ieee80211_iter_keys_rcu((rtwdev)->hw, vif, iterator, data) +void rtw_iterate_vifs(struct rtw_dev *rtwdev, + void (*iterator)(void *data, u8 *mac, + struct ieee80211_vif *vif), + void *data); +void rtw_iterate_stas(struct rtw_dev *rtwdev, + void (*iterator)(void *data, + struct ieee80211_sta *sta), + void *data); + static inline u8 *get_hdr_bssid(struct ieee80211_hdr *hdr) { __le16 fc = hdr->frame_control;