From patchwork Wed Sep 23 09:22:29 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Howard Chung X-Patchwork-Id: 11794367 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 8DC29618 for ; Wed, 23 Sep 2020 09:22:44 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6988A206C3 for ; Wed, 23 Sep 2020 09:22:44 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="Uhd7zm4j" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726638AbgIWJWi (ORCPT ); Wed, 23 Sep 2020 05:22:38 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42708 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726632AbgIWJWi (ORCPT ); Wed, 23 Sep 2020 05:22:38 -0400 Received: from mail-qk1-x749.google.com (mail-qk1-x749.google.com [IPv6:2607:f8b0:4864:20::749]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 695ACC0613D2 for ; Wed, 23 Sep 2020 02:22:38 -0700 (PDT) Received: by mail-qk1-x749.google.com with SMTP id m23so16073161qkh.10 for ; Wed, 23 Sep 2020 02:22:38 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=sender:date:message-id:mime-version:subject:from:to:cc; bh=p7FjT0Z9TxDxmogWu7RwZqin4A2u/8/n4a0QLXm41QA=; b=Uhd7zm4jAdOqVK+DWeJ+IDn2X0JgRtQslGb9WVWiZ+pxswl3yJa9hEdb07XF+oyyBv XBmN1WH1TanTM+p+7gXInyzYwtdSVuKas6QBcngfwM5ktxE1ahUdUAGM3mZlJYKjNQs0 TXTXykUU5v82HEHhO5ruXWh8BvaDLgRTDrMfrB327CyKxzAv8AF40McieQU880zBCbJK sTsUsZNYsq8y0XMTAu45HFiqCYFjJ5zSSFvJYRzJpQmUOQ0FuzMSdnOcnI6Sd7RCWWVf R+7P5jDx8/Nplup0Ur5CFcPSKYz8BCVKEc+L5FbsZynSXaiMnuhj3XdiqxpBi39E52ae OBDw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:date:message-id:mime-version:subject:from :to:cc; bh=p7FjT0Z9TxDxmogWu7RwZqin4A2u/8/n4a0QLXm41QA=; b=W0SYvo7i9CYWEYNnGagVSH2WqOyKOqnJ/ddeksD44gSKsLyIlYEw7YBfKYOT7CQmtz dtXUZQQUSVXAPuOTyyypUE1tY9QYLb5kgK4rMK5YZ0rqzF3NYkk/Fau6Kxt6DM4rTjSi FfW5JJt7ST6fZ6cnZZUCOQXvE+lQcBUGdtR3wFip8uk5pWEW8ZqgInaUYcgV7P/J5fnl 53/ijqM3LDv07CZ7artX+SYHgzgVsAbhHRKw7qdv9HbBvOvOFCbnD2hXtaTA+tJl459z zMdkdtTUivhj3Of+Od4FLpp2DkTlm2kBeJrQUBdf8IeHdxw7uLhdStSjX5C98xuN0C4F n5hQ== X-Gm-Message-State: AOAM531ImsBQswXC8w5cQVYwAb/tBN7eALg4S0v15Li/4OPUIcmGizyY ZPGi9ia8ONTxWcDS62ouOS0S17nETo++M18c//ooDkjpM7IC0kHd3n/hVlGzFBujyEkiv9sN1+g Zr4YUEy/US7JdH4YO8Z1JXnxX8/BWXT/LzUR/oGjqFkARLqUVrgFDx1n7JzNJHRPvpMkyiql8YX o5lrVx4yrlQvY= X-Google-Smtp-Source: ABdhPJzhH4foqTq1nf/zVlsqPGwf8FxHK07J9KHYUL616ICVa2IMbSLTZp54XM6QVxylb4INYaathIrZyZNfuwst+Q== Sender: "howardchung via sendgmr" X-Received: from howardchung-p920.tpe.corp.google.com ([2401:fa00:1:10:f693:9fff:fef4:4e45]) (user=howardchung job=sendgmr) by 2002:a0c:abc7:: with SMTP id k7mr9794492qvb.45.1600852957349; Wed, 23 Sep 2020 02:22:37 -0700 (PDT) Date: Wed, 23 Sep 2020 17:22:29 +0800 Message-Id: <20200923172129.v5.1.Ib75f58e90c477f9b82c5598f00c59f0e95a1a352@changeid> Mime-Version: 1.0 X-Mailer: git-send-email 2.28.0.681.g6f77f65b4e-goog Subject: [PATCH v5 1/4] Bluetooth: Interleave with allowlist scan From: Howard Chung To: linux-bluetooth@vger.kernel.org, marcel@holtmann.org, luiz.dentz@gmail.com Cc: mmandlik@chromium.orgi, mcchou@chromium.org, alainm@chromium.org, Howard Chung , Manish Mandlik , "David S. Miller" , Jakub Kicinski , Johan Hedberg , linux-kernel@vger.kernel.org, netdev@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-bluetooth@vger.kernel.org This patch implements the interleaving between allowlist scan and no-filter scan. It'll be used to save power when at least one monitor is registered and at least one pending connection or one device to be scanned for. The durations of the allowlist scan and the no-filter scan are controlled by MGMT command: Set Default System Configuration. The default values are set randomly for now. Signed-off-by: Howard Chung Reviewed-by: Alain Michaud Reviewed-by: Manish Mandlik --- Changes in v5: - Rename 'adv_monitor' from many functions/variables - Move __hci_update_interleaved_scan into hci_req_add_le_passive_scan - Update the logic of update_adv_monitor_scan_state Changes in v4: - Rebase to bluetooth-next/master (previous 2 patches are applied) - Fix over 80 chars limit in mgmt_config.c - Set EnableAdvMonInterleaveScan default to Disable Changes in v3: - Remove 'Bluez' prefix Changes in v2: - remove 'case 0x001c' in mgmt_config.c include/net/bluetooth/hci_core.h | 10 +++ net/bluetooth/hci_core.c | 4 + net/bluetooth/hci_request.c | 133 +++++++++++++++++++++++++++++-- net/bluetooth/mgmt_config.c | 10 +++ 4 files changed, 150 insertions(+), 7 deletions(-) diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h index 9873e1c8cd163..cfede18709d8f 100644 --- a/include/net/bluetooth/hci_core.h +++ b/include/net/bluetooth/hci_core.h @@ -361,6 +361,8 @@ struct hci_dev { __u8 ssp_debug_mode; __u8 hw_error_code; __u32 clock; + __u16 advmon_allowlist_duration; + __u16 advmon_no_filter_duration; __u16 devid_source; __u16 devid_vendor; @@ -542,6 +544,14 @@ struct hci_dev { struct delayed_work rpa_expired; bdaddr_t rpa; + enum { + INTERLEAVE_SCAN_NONE, + INTERLEAVE_SCAN_NO_FILTER, + INTERLEAVE_SCAN_ALLOWLIST + } interleave_scan_state; + + struct delayed_work interleave_scan; + #if IS_ENABLED(CONFIG_BT_LEDS) struct led_trigger *power_led; #endif diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c index f30a1f5950e15..6c8850149265a 100644 --- a/net/bluetooth/hci_core.c +++ b/net/bluetooth/hci_core.c @@ -3592,6 +3592,10 @@ struct hci_dev *hci_alloc_dev(void) hdev->cur_adv_instance = 0x00; hdev->adv_instance_timeout = 0; + /* The default values will be chosen in the future */ + hdev->advmon_allowlist_duration = 300; + hdev->advmon_no_filter_duration = 500; + hdev->sniff_max_interval = 800; hdev->sniff_min_interval = 80; diff --git a/net/bluetooth/hci_request.c b/net/bluetooth/hci_request.c index d2b06f5c93804..ba3016cc0b573 100644 --- a/net/bluetooth/hci_request.c +++ b/net/bluetooth/hci_request.c @@ -378,6 +378,56 @@ void __hci_req_write_fast_connectable(struct hci_request *req, bool enable) hci_req_add(req, HCI_OP_WRITE_PAGE_SCAN_TYPE, 1, &type); } +static void start_interleave_scan(struct hci_dev *hdev) +{ + hdev->interleave_scan_state = INTERLEAVE_SCAN_NO_FILTER; + queue_delayed_work(hdev->req_workqueue, + &hdev->interleave_scan, 0); +} + +static bool is_interleave_scanning(struct hci_dev *hdev) +{ + return hdev->interleave_scan_state != INTERLEAVE_SCAN_NONE; +} + +static void cancel_interleave_scan(struct hci_dev *hdev) +{ + bt_dev_dbg(hdev, "%s cancelling interleave scan", hdev->name); + + cancel_delayed_work_sync(&hdev->interleave_scan); + + hdev->interleave_scan_state = INTERLEAVE_SCAN_NONE; +} + +/* Return true if interleave_scan wasn't started until exiting this function, + * otherwise, return false + */ +static bool __hci_update_interleaved_scan(struct hci_dev *hdev) +{ + if (hci_is_adv_monitoring(hdev) && + !(list_empty(&hdev->pend_le_conns) && + list_empty(&hdev->pend_le_reports))) { + if (!is_interleave_scanning(hdev)) { + /* If there is at least one ADV monitors and one pending + * LE connection or one device to be scanned for, we + * should alternate between allowlist scan and one + * without any filters to save power. + */ + start_interleave_scan(hdev); + bt_dev_dbg(hdev, "%s starting interleave scan", + hdev->name); + return true; + } + } else if (is_interleave_scanning(hdev)) { + /* If the interleave condition no longer holds, cancel + * the existed interleave scan. + */ + cancel_interleave_scan(hdev); + } + + return false; +} + /* This function controls the background scanning based on hdev->pend_le_conns * list. If there are pending LE connection we start the background scanning, * otherwise we stop it. @@ -450,8 +500,8 @@ static void __hci_update_background_scan(struct hci_request *req) hci_req_add_le_scan_disable(req, false); hci_req_add_le_passive_scan(req); - - BT_DBG("%s starting background scanning", hdev->name); + bt_dev_dbg(hdev, "%s starting background scanning", + hdev->name); } } @@ -844,12 +894,17 @@ static u8 update_white_list(struct hci_request *req) return 0x00; } - /* Once the controller offloading of advertisement monitor is in place, - * the if condition should include the support of MSFT extension - * support. If suspend is ongoing, whitelist should be the default to - * prevent waking by random advertisements. + /* Use the allowlist unless the following conditions are all true: + * - We are not currently suspending + * - There are 1 or more ADV monitors registered + * - Interleaved scanning is not currently using the allowlist + * + * Once the controller offloading of advertisement monitor is in place, + * the above condition should include the support of MSFT extension + * support. */ - if (!idr_is_empty(&hdev->adv_monitors_idr) && !hdev->suspended) + if (!idr_is_empty(&hdev->adv_monitors_idr) && !hdev->suspended && + hdev->interleave_scan_state != INTERLEAVE_SCAN_ALLOWLIST) return 0x00; /* Select filter policy to use white list */ @@ -1002,6 +1057,9 @@ void hci_req_add_le_passive_scan(struct hci_request *req) &own_addr_type)) return; + if (__hci_update_interleaved_scan(hdev)) + return; + /* Adding or removing entries from the white list must * happen before enabling scanning. The controller does * not allow white list modification while scanning. @@ -1871,6 +1929,64 @@ static void adv_timeout_expire(struct work_struct *work) hci_dev_unlock(hdev); } +static int hci_req_add_le_interleaved_scan(struct hci_request *req, + unsigned long opt) +{ + struct hci_dev *hdev = req->hdev; + int ret = 0; + + hci_dev_lock(hdev); + + if (hci_dev_test_flag(hdev, HCI_LE_SCAN)) + hci_req_add_le_scan_disable(req, false); + hci_req_add_le_passive_scan(req); + + switch (hdev->interleave_scan_state) { + case INTERLEAVE_SCAN_ALLOWLIST: + bt_dev_dbg(hdev, "next state: allowlist"); + hdev->interleave_scan_state = INTERLEAVE_SCAN_NO_FILTER; + break; + case INTERLEAVE_SCAN_NO_FILTER: + bt_dev_dbg(hdev, "next state: no filter"); + hdev->interleave_scan_state = INTERLEAVE_SCAN_ALLOWLIST; + break; + case INTERLEAVE_SCAN_NONE: + default: + BT_ERR("unexpected error"); + ret = -1; + } + + hci_dev_unlock(hdev); + + return ret; +} + +static void interleave_scan_work(struct work_struct *work) +{ + struct hci_dev *hdev = container_of(work, struct hci_dev, + interleave_scan.work); + u8 status; + unsigned long timeout; + + if (hdev->interleave_scan_state == INTERLEAVE_SCAN_ALLOWLIST) { + timeout = msecs_to_jiffies(hdev->advmon_allowlist_duration); + } else if (hdev->interleave_scan_state == INTERLEAVE_SCAN_NO_FILTER) { + timeout = msecs_to_jiffies(hdev->advmon_no_filter_duration); + } else { + bt_dev_err(hdev, "unexpected error"); + return; + } + + hci_req_sync(hdev, hci_req_add_le_interleaved_scan, 0, + HCI_CMD_TIMEOUT, &status); + + /* Don't continue interleaving if it was canceled */ + if (is_interleave_scanning(hdev)) { + queue_delayed_work(hdev->req_workqueue, + &hdev->interleave_scan, timeout); + } +} + int hci_get_random_address(struct hci_dev *hdev, bool require_privacy, bool use_rpa, struct adv_info *adv_instance, u8 *own_addr_type, bdaddr_t *rand_addr) @@ -3292,6 +3408,7 @@ void hci_request_setup(struct hci_dev *hdev) INIT_DELAYED_WORK(&hdev->le_scan_disable, le_scan_disable_work); INIT_DELAYED_WORK(&hdev->le_scan_restart, le_scan_restart_work); INIT_DELAYED_WORK(&hdev->adv_instance_expire, adv_timeout_expire); + INIT_DELAYED_WORK(&hdev->interleave_scan, interleave_scan_work); } void hci_request_cancel_all(struct hci_dev *hdev) @@ -3311,4 +3428,6 @@ void hci_request_cancel_all(struct hci_dev *hdev) cancel_delayed_work_sync(&hdev->adv_instance_expire); hdev->adv_instance_timeout = 0; } + + cancel_interleave_scan(hdev); } diff --git a/net/bluetooth/mgmt_config.c b/net/bluetooth/mgmt_config.c index b30b571f8caf8..2d3ad288c78ac 100644 --- a/net/bluetooth/mgmt_config.c +++ b/net/bluetooth/mgmt_config.c @@ -67,6 +67,8 @@ int read_def_system_config(struct sock *sk, struct hci_dev *hdev, void *data, HDEV_PARAM_U16(0x001a, le_supv_timeout), HDEV_PARAM_U16_JIFFIES_TO_MSECS(0x001b, def_le_autoconnect_timeout), + HDEV_PARAM_U16(0x001d, advmon_allowlist_duration), + HDEV_PARAM_U16(0x001e, advmon_no_filter_duration), }; struct mgmt_rp_read_def_system_config *rp = (void *)params; @@ -138,6 +140,8 @@ int set_def_system_config(struct sock *sk, struct hci_dev *hdev, void *data, case 0x0019: case 0x001a: case 0x001b: + case 0x001d: + case 0x001e: if (len != sizeof(u16)) { bt_dev_warn(hdev, "invalid length %d, exp %zu for type %d", len, sizeof(u16), type); @@ -251,6 +255,12 @@ int set_def_system_config(struct sock *sk, struct hci_dev *hdev, void *data, hdev->def_le_autoconnect_timeout = msecs_to_jiffies(TLV_GET_LE16(buffer)); break; + case 0x0001d: + hdev->advmon_allowlist_duration = TLV_GET_LE16(buffer); + break; + case 0x0001e: + hdev->advmon_no_filter_duration = TLV_GET_LE16(buffer); + break; default: bt_dev_warn(hdev, "unsupported parameter %u", type); break;