From patchwork Wed Mar 4 01:06:49 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Abhishek Pandit-Subedi X-Patchwork-Id: 1248688 X-Patchwork-Delegate: davem@davemloft.net Return-Path: X-Original-To: patchwork-incoming-netdev@ozlabs.org Delivered-To: patchwork-incoming-netdev@ozlabs.org Authentication-Results: ozlabs.org; spf=none (no SPF record) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=netdev-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=pass (p=none dis=none) header.from=chromium.org Authentication-Results: ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=chromium.org header.i=@chromium.org header.a=rsa-sha256 header.s=google header.b=F6NMdqPr; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 48XG1l0rXwz9sSG for ; Wed, 4 Mar 2020 12:07:07 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2387522AbgCDBHF (ORCPT ); Tue, 3 Mar 2020 20:07:05 -0500 Received: from mail-pj1-f68.google.com ([209.85.216.68]:33975 "EHLO mail-pj1-f68.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2387500AbgCDBHE (ORCPT ); Tue, 3 Mar 2020 20:07:04 -0500 Received: by mail-pj1-f68.google.com with SMTP id f2so1817868pjq.1 for ; Tue, 03 Mar 2020 17:07:03 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=m+K0TGWc4HnteXlVBS4gLC/Nu6BvXZvSL2BDlCkEUXk=; b=F6NMdqPrhsdchoaJkQnC8cYNotm9saFI6AvC98AHub2r60SCKh0JNOn+jMv8RSWtkH RilC9j6KAj8OHutPzJjnZWnc7iuFcwLDwdx/FmDqB8Sh6YsdVsG/uxQspApCqanXf+07 Yan04pAWSwlbTVkhJbsXvLGsx94TkK2Nvn8EA= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=m+K0TGWc4HnteXlVBS4gLC/Nu6BvXZvSL2BDlCkEUXk=; b=NYX/aMBJGXMY9mQ5x/crfL5DGrzowkSIE4xWYEBf0IHsajpsHClg/njkfj5kF5FsDQ 7EBWHz3cBV3gkAcl3jb4wj9Wclv5ZofgjinumIcBmkBOFLpCKQ8H38PBBZk55XjPmURw NPFWC0AbW8Kghttr5ouJMNc1bbF2p1R4Hs2z3O5fjeS7j3ZCBJXKUs6/XUG/zgxKyL0+ AXkv98A+SBG4dBglPjQsObMwX6y6fB9+DAiSX6ejyi9KLMn8s6xQqN/UIGEvxeHVGw+J hsQdz7B6JMhBEs1ZgA6vk952LE9uR14Zxl/okiIwMiLCLqCVXVUQ+VwGSY0ESo+QrCF5 OOqw== X-Gm-Message-State: ANhLgQ0/SAp4Lo8iaiC8HT2m4PyyKbEyawTb8+iIQ5iiCmCUdGOpWHYd bQWIeuLRzutjeEXFABpuQ4qJNQ== X-Google-Smtp-Source: ADFU+vvs/C93yVt3EKnaxJCKLr9e92lgc71JmNGAbYHKf4FceC5/Tf3Esa/8aVCUVcPXBoHt4OPWBg== X-Received: by 2002:a17:90a:a616:: with SMTP id c22mr342620pjq.47.1583284022605; Tue, 03 Mar 2020 17:07:02 -0800 (PST) Received: from apsdesk.mtv.corp.google.com ([2620:15c:202:1:e09a:8d06:a338:aafb]) by smtp.gmail.com with ESMTPSA id w2sm17780889pfb.138.2020.03.03.17.07.01 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 03 Mar 2020 17:07:01 -0800 (PST) From: Abhishek Pandit-Subedi To: marcel@holtmann.org, luiz.dentz@gmail.com, alainm@chromium.org Cc: linux-bluetooth@vger.kernel.org, chromeos-bluetooth-upstreaming@chromium.org, Abhishek Pandit-Subedi , "David S. Miller" , Johan Hedberg , netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Jakub Kicinski Subject: [RFC PATCH v4 4/5] Bluetooth: Handle LE devices during suspend Date: Tue, 3 Mar 2020 17:06:49 -0800 Message-Id: <20200303170610.RFC.v4.4.Ib0d1956aff8b9b0eff8efff085675f2156fe91c5@changeid> X-Mailer: git-send-email 2.25.0.265.gbab2e86ba0-goog In-Reply-To: <20200304010650.259961-1-abhishekpandit@chromium.org> References: <20200304010650.259961-1-abhishekpandit@chromium.org> MIME-Version: 1.0 Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org To handle LE devices, we must first disable passive scanning and disconnect all connected devices. Once that is complete, we update the whitelist and re-enable scanning Signed-off-by: Abhishek Pandit-Subedi --- Changes in v4: None Changes in v3: * Split LE changes into its own commit Changes in v2: None net/bluetooth/hci_request.c | 164 ++++++++++++++++++++++++------------ 1 file changed, 110 insertions(+), 54 deletions(-) diff --git a/net/bluetooth/hci_request.c b/net/bluetooth/hci_request.c index 4d67b1d08608..88fd95d70f89 100644 --- a/net/bluetooth/hci_request.c +++ b/net/bluetooth/hci_request.c @@ -34,6 +34,9 @@ #define HCI_REQ_PEND 1 #define HCI_REQ_CANCELED 2 +#define LE_SUSPEND_SCAN_WINDOW 0x0012 +#define LE_SUSPEND_SCAN_INTERVAL 0x0060 + void hci_req_init(struct hci_request *req, struct hci_dev *hdev) { skb_queue_head_init(&req->cmd_q); @@ -654,6 +657,11 @@ void hci_req_add_le_scan_disable(struct hci_request *req) { struct hci_dev *hdev = req->hdev; + if (hdev->scanning_paused) { + BT_DBG("Scanning is paused for suspend"); + return; + } + if (use_ext_scan(hdev)) { struct hci_cp_le_set_ext_scan_enable cp; @@ -670,15 +678,53 @@ void hci_req_add_le_scan_disable(struct hci_request *req) } } -static void add_to_white_list(struct hci_request *req, - struct hci_conn_params *params) +static void del_from_white_list(struct hci_request *req, bdaddr_t *bdaddr, + u8 bdaddr_type) +{ + struct hci_cp_le_del_from_white_list cp; + + cp.bdaddr_type = bdaddr_type; + bacpy(&cp.bdaddr, bdaddr); + + BT_DBG("Remove %pMR (0x%x) from whitelist", &cp.bdaddr, cp.bdaddr_type); + hci_req_add(req, HCI_OP_LE_DEL_FROM_WHITE_LIST, sizeof(cp), &cp); +} + +/* Adds connection to white list if needed. On error, returns -1. */ +static int add_to_white_list(struct hci_request *req, + struct hci_conn_params *params, u8 *num_entries, + bool allow_rpa) { struct hci_cp_le_add_to_white_list cp; + struct hci_dev *hdev = req->hdev; + + /* Already in white list */ + if (hci_bdaddr_list_lookup(&hdev->le_white_list, ¶ms->addr, + params->addr_type)) + return 0; + + /* Select filter policy to accept all advertising */ + if (*num_entries >= hdev->le_white_list_size) + return -1; + /* White list can not be used with RPAs */ + if (!allow_rpa && + hci_find_irk_by_addr(hdev, ¶ms->addr, params->addr_type)) { + return -1; + } + + /* During suspend, only wakeable devices can be in whitelist */ + if (hdev->suspended && !params->wakeable) + return 0; + + *num_entries += 1; cp.bdaddr_type = params->addr_type; bacpy(&cp.bdaddr, ¶ms->addr); + BT_DBG("Add %pMR (0x%x) to whitelist", &cp.bdaddr, cp.bdaddr_type); hci_req_add(req, HCI_OP_LE_ADD_TO_WHITE_LIST, sizeof(cp), &cp); + + return 0; } static u8 update_white_list(struct hci_request *req) @@ -686,7 +732,14 @@ static u8 update_white_list(struct hci_request *req) struct hci_dev *hdev = req->hdev; struct hci_conn_params *params; struct bdaddr_list *b; - uint8_t white_list_entries = 0; + u8 num_entries = 0; + bool pend_conn, pend_report; + /* We allow whitelisting even with RPAs in suspend. In the worst case, + * we won't be able to wake from devices that use the privacy1.2 + * features. Additionally, once we support privacy1.2 and IRK + * offloading, we can update this to also check for those conditions. + */ + bool allow_rpa = hdev->suspended; /* Go through the current white list programmed into the * controller one by one and check if that address is still @@ -695,29 +748,28 @@ static u8 update_white_list(struct hci_request *req) * command to remove it from the controller. */ list_for_each_entry(b, &hdev->le_white_list, list) { - /* If the device is neither in pend_le_conns nor - * pend_le_reports then remove it from the whitelist. + pend_conn = hci_pend_le_action_lookup(&hdev->pend_le_conns, + &b->bdaddr, + b->bdaddr_type); + pend_report = hci_pend_le_action_lookup(&hdev->pend_le_reports, + &b->bdaddr, + b->bdaddr_type); + + /* If the device is not likely to connect or report, + * remove it from the whitelist. */ - if (!hci_pend_le_action_lookup(&hdev->pend_le_conns, - &b->bdaddr, b->bdaddr_type) && - !hci_pend_le_action_lookup(&hdev->pend_le_reports, - &b->bdaddr, b->bdaddr_type)) { - struct hci_cp_le_del_from_white_list cp; - - cp.bdaddr_type = b->bdaddr_type; - bacpy(&cp.bdaddr, &b->bdaddr); - - hci_req_add(req, HCI_OP_LE_DEL_FROM_WHITE_LIST, - sizeof(cp), &cp); + if (!pend_conn && !pend_report) { + del_from_white_list(req, &b->bdaddr, b->bdaddr_type); continue; } - if (hci_find_irk_by_addr(hdev, &b->bdaddr, b->bdaddr_type)) { - /* White list can not be used with RPAs */ + /* White list can not be used with RPAs */ + if (!allow_rpa && + hci_find_irk_by_addr(hdev, &b->bdaddr, b->bdaddr_type)) { return 0x00; } - white_list_entries++; + num_entries++; } /* Since all no longer valid white list entries have been @@ -731,47 +783,17 @@ static u8 update_white_list(struct hci_request *req) * white list. */ list_for_each_entry(params, &hdev->pend_le_conns, action) { - if (hci_bdaddr_list_lookup(&hdev->le_white_list, - ¶ms->addr, params->addr_type)) - continue; - - if (white_list_entries >= hdev->le_white_list_size) { - /* Select filter policy to accept all advertising */ + if (add_to_white_list(req, params, &num_entries, allow_rpa)) return 0x00; - } - - if (hci_find_irk_by_addr(hdev, ¶ms->addr, - params->addr_type)) { - /* White list can not be used with RPAs */ - return 0x00; - } - - white_list_entries++; - add_to_white_list(req, params); } /* After adding all new pending connections, walk through * the list of pending reports and also add these to the - * white list if there is still space. + * white list if there is still space. Abort if space runs out. */ list_for_each_entry(params, &hdev->pend_le_reports, action) { - if (hci_bdaddr_list_lookup(&hdev->le_white_list, - ¶ms->addr, params->addr_type)) - continue; - - if (white_list_entries >= hdev->le_white_list_size) { - /* Select filter policy to accept all advertising */ + if (add_to_white_list(req, params, &num_entries, allow_rpa)) return 0x00; - } - - if (hci_find_irk_by_addr(hdev, ¶ms->addr, - params->addr_type)) { - /* White list can not be used with RPAs */ - return 0x00; - } - - white_list_entries++; - add_to_white_list(req, params); } /* Select filter policy to use white list */ @@ -866,6 +888,12 @@ void hci_req_add_le_passive_scan(struct hci_request *req) struct hci_dev *hdev = req->hdev; u8 own_addr_type; u8 filter_policy; + u8 window, interval; + + if (hdev->scanning_paused) { + BT_DBG("Scanning is paused for suspend"); + return; + } /* Set require_privacy to false since no SCAN_REQ are send * during passive scanning. Not using an non-resolvable address @@ -896,8 +924,17 @@ void hci_req_add_le_passive_scan(struct hci_request *req) (hdev->le_features[0] & HCI_LE_EXT_SCAN_POLICY)) filter_policy |= 0x02; - hci_req_start_scan(req, LE_SCAN_PASSIVE, hdev->le_scan_interval, - hdev->le_scan_window, own_addr_type, filter_policy); + if (hdev->suspended) { + window = LE_SUSPEND_SCAN_WINDOW; + interval = LE_SUSPEND_SCAN_INTERVAL; + } else { + window = hdev->le_scan_window; + interval = hdev->le_scan_interval; + } + + BT_DBG("LE passive scan with whitelist = %d", filter_policy); + hci_req_start_scan(req, LE_SCAN_PASSIVE, interval, window, + own_addr_type, filter_policy); } static u8 get_adv_instance_scan_rsp_len(struct hci_dev *hdev, u8 instance) @@ -957,6 +994,18 @@ static void hci_req_set_event_filter(struct hci_request *req) hci_req_add(req, HCI_OP_WRITE_SCAN_ENABLE, 1, &scan); } +static void hci_req_config_le_suspend_scan(struct hci_request *req) +{ + /* Can't change params without disabling first */ + hci_req_add_le_scan_disable(req); + + /* Configure params and enable scanning */ + hci_req_add_le_passive_scan(req); + + /* Block suspend notifier on response */ + set_bit(SUSPEND_SCAN_ENABLE, req->hdev->suspend_tasks); +} + static void suspend_req_complete(struct hci_dev *hdev, u8 status, u16 opcode) { BT_DBG("Request complete opcode=0x%x, status=0x%x", opcode, status); @@ -991,6 +1040,9 @@ void hci_req_prepare_suspend(struct hci_dev *hdev, enum suspended_state next) page_scan = SCAN_DISABLED; hci_req_add(&req, HCI_OP_WRITE_SCAN_ENABLE, 1, &page_scan); + /* Disable LE passive scan */ + hci_req_add_le_scan_disable(&req); + /* Mark task needing completion */ set_bit(SUSPEND_SCAN_DISABLE, hdev->suspend_tasks); @@ -1017,6 +1069,8 @@ void hci_req_prepare_suspend(struct hci_dev *hdev, enum suspended_state next) hdev->scanning_paused = false; /* Enable event filter for paired devices */ hci_req_set_event_filter(&req); + /* Enable passive scan at lower duty cycle */ + hci_req_config_le_suspend_scan(&req); /* Pause scan changes again. */ hdev->scanning_paused = true; hci_req_run(&req, suspend_req_complete); @@ -1025,6 +1079,8 @@ void hci_req_prepare_suspend(struct hci_dev *hdev, enum suspended_state next) hdev->scanning_paused = false; hci_req_clear_event_filter(&req); + /* Reset passive/background scanning to normal */ + hci_req_config_le_suspend_scan(&req); hci_req_run(&req, suspend_req_complete); }