From patchwork Mon Dec 26 07:48:29 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hilda Wu X-Patchwork-Id: 637078 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 2F397C46467 for ; Mon, 26 Dec 2022 07:48:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231585AbiLZHst (ORCPT ); Mon, 26 Dec 2022 02:48:49 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60942 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229486AbiLZHsr (ORCPT ); Mon, 26 Dec 2022 02:48:47 -0500 Received: from rtits2.realtek.com.tw (rtits2.realtek.com [211.75.126.72]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 361D038BA; Sun, 25 Dec 2022 23:48:46 -0800 (PST) Authenticated-By: X-SpamFilter-By: ArmorX SpamTrap 5.77 with qID 2BQ7lfvfF020287, This message is accepted by code: ctloc85258 Received: from mail.realtek.com (rtexh36505.realtek.com.tw[172.21.6.25]) by rtits2.realtek.com.tw (8.15.2/2.81/5.90) with ESMTPS id 2BQ7lfvfF020287 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=FAIL); Mon, 26 Dec 2022 15:47:41 +0800 Received: from RTEXMBS04.realtek.com.tw (172.21.6.97) by RTEXH36505.realtek.com.tw (172.21.6.25) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.32; Mon, 26 Dec 2022 15:48:34 +0800 Received: from localhost.localdomain (172.21.132.192) by RTEXMBS04.realtek.com.tw (172.21.6.97) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.7; Mon, 26 Dec 2022 15:48:34 +0800 From: To: CC: , , , , , , , , Subject: [PATCH v5] Bluetooth: btusb: Work around spotty SCO quality Date: Mon, 26 Dec 2022 15:48:29 +0800 Message-ID: <20221226074829.8682-1-hildawu@realtek.com> X-Mailer: git-send-email 2.17.1 MIME-Version: 1.0 X-Originating-IP: [172.21.132.192] X-ClientProxiedBy: RTEXH36506.realtek.com.tw (172.21.6.27) To RTEXMBS04.realtek.com.tw (172.21.6.97) X-KSE-ServerInfo: RTEXMBS04.realtek.com.tw, 9 X-KSE-AntiSpam-Interceptor-Info: trusted connection X-KSE-Antiphishing-Info: Clean X-KSE-Antiphishing-ScanningType: Deterministic X-KSE-Antiphishing-Method: None X-KSE-Antiphishing-Bases: 12/26/2022 07:28:00 X-KSE-AttachmentFiltering-Interceptor-Info: no applicable attachment filtering rules found X-KSE-Antivirus-Interceptor-Info: scan successful X-KSE-Antivirus-Info: =?big5_tw?b?Q2xlYW4sIGJhc2VzOiAyMDIyLzEyLzI2IKRXpMggMDQ6?= =?big5_tw?b?Mzc6MDA=?= X-KSE-BulkMessagesFiltering-Scan-Result: protection disabled X-KSE-ServerInfo: RTEXH36505.realtek.com.tw, 9 X-KSE-Attachment-Filter-Triggered-Rules: Clean X-KSE-Attachment-Filter-Triggered-Filters: Clean X-KSE-BulkMessagesFiltering-Scan-Result: protection disabled Precedence: bulk List-ID: X-Mailing-List: linux-bluetooth@vger.kernel.org From: Hilda Wu When streaming HFP, every few minutes a brief pause in audio can be heard on some platforms with Realtek Bluetooth. Linux based products may be encountered, but because of the different implementation of upper-level SCO services, the situation would not necessarily impact customer experience. But when the issue occurs, the system will see the SCO packet for unknown connection handle messages. Note: This issue affects (e)SCO only, does not affect ACLs. The duplicate data affected the invalid connection handle only occurs in Realtek BT. This is to filter out the duplicate packet for avoiding influence. The btmon trace gives a better idea of what we're filtering. The following excerpts are part of SCO packets in the HCI log: > SCO Data RX: Handle 11 flags 0x00 dlen 72 #23327 [hci0] 132.343418 8c a3 55 4f 8a d5 56 e9 35 56 37 8d 55 87 53 55 ..UO..V.5V7.U.SU 59 66 d5 57 1d b5 54 00 01 08 ad 00 00 e0 10 00 Yf.W..T......... 00 00 85 c6 d5 60 e9 b5 52 94 6d 54 e4 9b 55 b1 .....`..R.mT..U. b6 d5 62 91 b5 57 84 6d 56 e4 5b 55 75 c6 d5 51 ..b..W.mV.[Uu..Q 2d b5 53 9a 6d 54 a5 1b -.S.mT.. < SCO Data TX: Handle 11 flags 0x00 dlen 72 #23328 [hci0] 132.343600 01 c8 ad 00 00 aa db ba aa a9 72 b4 d9 5d af 14 ..........r..].. 53 0c 75 b0 a6 f3 8a 51 b3 54 17 b1 a6 d5 62 c5 S.u....Q.T....b. d5 6b 35 29 8d c5 1c 56 4c 24 96 9b 8d b5 d7 1a .k5)...VL$...... b2 8d bc da 3b 8c 46 ae 1d 4d a4 04 01 f8 ad 00 ....;.F..M...... 00 3d ec bb a9 98 8b 28 .=.....( > SCO Data RX: Handle 11 flags 0x00 dlen 72 #23329 [hci0] 132.353419 55 55 c6 d5 62 29 b5 57 b2 6d 54 00 01 38 ad 00 UU..b).W.mT..8.. 00 e0 10 00 00 00 0b 00 d5 62 55 c6 57 b2 29 b5 .........bU.W.). 00 01 6d 54 00 00 38 ad 00 00 e0 10 00 00 00 92 ..mT..8......... 36 d5 5a ed b5 58 6c 6d 55 b3 1b 55 6b 26 d5 52 6.Z..XlmU..Uk&.R d1 b5 54 23 6d 56 82 db ..T#mV.. < SCO Data TX: Handle 11 flags 0x00 dlen 72 #23330 [hci0] 132.353581 6d 5b be db 89 34 66 e9 fa 99 a6 6e e5 6d 9f 1a m[...4f....n.m.. 1c 57 d2 66 92 63 98 99 a9 3b 8a 6c 3e 5b 5a 34 .W.f.c...;.l>[Z4 a4 96 e2 21 21 8c f8 88 0f 3d e0 52 48 85 18 00 ...!!....=.RH... 01 08 ad 00 00 0c eb ba a9 a8 28 ca 9a d0 3c 33 ..........(...<3 45 4a f9 90 fb ca 4b 39 EJ....K9 > SCO Data RX: Handle 2901 flags 0x0a dlen 54 #23331 [hci0] 132.373416 d5 48 a9 b5 56 aa 6d 56 d2 db 55 75 36 d5 56 2d .H..V.mV..Uu6.V- b5 57 5b 6d 54 00 0b 00 48 01 c8 ad 00 00 e0 10 .W[mT...H....... 00 00 00 5e c6 d5 56 e1 b5 56 43 6d 55 ca db 55 ...^..V..VCmU..U 7d c6 d5 5b 31 b5 We handle is HCI SCO Data RX packets. The packet 23327 was a normal HCI SCO Data RX packet. The packet 23329 was the abnormal HCI SCO Data RX packet. The packet 23331 was the invalid connection handle affected by the packet 23329 abnormal HCI SCO Data RX packet. So we expect to filter the packet 23329 SCO data RX packet case. As you can see the packet 23329, the packet's connection handle (0x0B 00/11) and length (0x48/72) is normal. This btmon trace is SCO packets in USB alternate setting 3, payload length is 72 bytes that consist of three SCO data packets. After our investigation, we found that the anomaly is due to the intermediate composition data. There is duplicate data in the intermediate composition data, but it affects packet combination. The system parses the next packet of the connection handle mistake, so the system shows unknown connection handle messages. This commit can estimate and find out its abnormal rule to filter the duplicate packet out for avoiding influence. Check fragments and filter out the abnormal packet, and then it will not affect the system parsing of the connection handle subsequent. This commit can filter out the invalid connection handle and avoid the spotty SCO quality. Signed-off-by: Alex Lu Signed-off-by: Hilda Wu --- Changes in v5: - Fix typos in the commit log. Changes in v4: - Fix typos and add more in commit description. - Modify comparison method. Changes in v3: - Use the vendor function to replace btus_recv_isoc - Additional info: The comparison of btrtl_usb_recv_isoc here is for invalid handle, the invalid handle shouldn't appear. So we try to find out the rule and filter out this. Changes in v2: - Separate commits for functions --- --- drivers/bluetooth/btrtl.c | 33 ++++++++++++++++ drivers/bluetooth/btrtl.h | 7 ++++ drivers/bluetooth/btusb.c | 80 ++++++++++++++++++++++++++++++++++++++- 3 files changed, 119 insertions(+), 1 deletion(-) diff --git a/drivers/bluetooth/btrtl.c b/drivers/bluetooth/btrtl.c index 69c3fe649ca7..a0a33d2467ef 100644 --- a/drivers/bluetooth/btrtl.c +++ b/drivers/bluetooth/btrtl.c @@ -944,6 +944,39 @@ int btrtl_get_uart_settings(struct hci_dev *hdev, } EXPORT_SYMBOL_GPL(btrtl_get_uart_settings); +int btrtl_usb_recv_isoc(u16 pos, u8 *data, u8 *p, u16 wMaxPacketSize) +{ + u8 *prev; + u8 tmp[8]; + u8 zero[1] = {0}; + u32 *prev_frag_a; + u32 *prev_frag_b; + + /* Issue was found when alt was set to 3 or bigger */ + if (wMaxPacketSize < 25) + return 0; + + /* The first fragment is always correct. */ + if (pos < wMaxPacketSize) + return 0; + + if (memcmp(p, zero, sizeof(zero))) { + prev = data + (pos - wMaxPacketSize); + memcpy(tmp, prev + 4, 8); + prev_frag_a = (u32 *)(tmp); + prev_frag_b = (u32 *)(tmp + 4); + *prev_frag_a = swahw32(*prev_frag_a); + *prev_frag_b = swahw32(*prev_frag_b); + + /* Check the current fragment with the previous one. */ + if (!memcmp(p, prev, 2) && !memcmp(p + 2, tmp, 8)) + return -1; + } + + return 0; +} +EXPORT_SYMBOL_GPL(btrtl_usb_recv_isoc); + MODULE_AUTHOR("Daniel Drake "); MODULE_DESCRIPTION("Bluetooth support for Realtek devices ver " VERSION); MODULE_VERSION(VERSION); diff --git a/drivers/bluetooth/btrtl.h b/drivers/bluetooth/btrtl.h index ebf0101c959b..893f1eae57e2 100644 --- a/drivers/bluetooth/btrtl.h +++ b/drivers/bluetooth/btrtl.h @@ -83,6 +83,7 @@ int btrtl_get_uart_settings(struct hci_dev *hdev, struct btrtl_device_info *btrtl_dev, unsigned int *controller_baudrate, u32 *device_baudrate, bool *flow_control); +int btrtl_usb_recv_isoc(u16 pos, u8 *data, u8 *buffer, u16 wMaxPacketSize); #else @@ -126,4 +127,10 @@ static inline int btrtl_get_uart_settings(struct hci_dev *hdev, return -ENOENT; } +static inline int btrtl_usb_recv_isoc(u16 pos, u8 *data, u8 *buffer, + u16 wMaxPacketSize) +{ + return -EOPNOTSUPP; +} + #endif diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c index afd2f08ffe30..47e4dcaec948 100644 --- a/drivers/bluetooth/btusb.c +++ b/drivers/bluetooth/btusb.c @@ -792,6 +792,7 @@ struct btusb_data { int (*recv_event)(struct hci_dev *hdev, struct sk_buff *skb); int (*recv_acl)(struct hci_dev *hdev, struct sk_buff *skb); int (*recv_bulk)(struct btusb_data *data, void *buffer, int count); + int (*recv_isoc)(struct btusb_data *data, void *buffer, int count); int (*setup_on_usb)(struct hci_dev *hdev); @@ -1394,7 +1395,7 @@ static void btusb_isoc_complete(struct urb *urb) hdev->stat.byte_rx += length; - if (btusb_recv_isoc(data, urb->transfer_buffer + offset, + if (data->recv_isoc(data, urb->transfer_buffer + offset, length) < 0) { bt_dev_err(hdev, "corrupted SCO packet"); hdev->stat.err_rx++; @@ -2492,6 +2493,80 @@ static int btusb_setup_realtek(struct hci_dev *hdev) return ret; } +static int btusb_recv_isoc_realtek(struct btusb_data *data, void *buffer, + int count) +{ + struct sk_buff *skb; + unsigned long flags; + int err = 0; + u16 wMaxPacketSize = le16_to_cpu(data->isoc_rx_ep->wMaxPacketSize); + + spin_lock_irqsave(&data->rxlock, flags); + skb = data->sco_skb; + + while (count) { + int len; + + if (!skb) { + skb = bt_skb_alloc(HCI_MAX_SCO_SIZE, GFP_ATOMIC); + if (!skb) { + err = -ENOMEM; + break; + } + + hci_skb_pkt_type(skb) = HCI_SCODATA_PKT; + hci_skb_expect(skb) = HCI_SCO_HDR_SIZE; + } + + len = min_t(uint, hci_skb_expect(skb), count); + + /* Gaps in audio could be heard while streaming WBS using USB + * alt settings 3 on some platforms, since this is only used + * with RTK chips so let vendor function detect it. + */ + if (!btusb_find_altsetting(data, 6) && + test_bit(BTUSB_USE_ALT3_FOR_WBS, &data->flags)) { + err = btrtl_usb_recv_isoc(skb->len, skb->data, buffer, + wMaxPacketSize); + if (err) + break; + } + + skb_put_data(skb, buffer, len); + + count -= len; + buffer += len; + hci_skb_expect(skb) -= len; + + if (skb->len == HCI_SCO_HDR_SIZE) { + /* Complete SCO header */ + struct hci_sco_hdr *hdr = hci_sco_hdr(skb); + + hci_skb_expect(skb) = hdr->dlen; + + if (skb_tailroom(skb) < hci_skb_expect(skb) || + !btusb_validate_sco_handle(data->hdev, hdr)) { + kfree_skb(skb); + skb = NULL; + + err = -EILSEQ; + break; + } + } + + if (!hci_skb_expect(skb)) { + /* Complete frame */ + hci_recv_frame(data->hdev, skb); + skb = NULL; + } + } + + data->sco_skb = skb; + spin_unlock_irqrestore(&data->rxlock, flags); + + return err; +} + /* UHW CR mapping */ #define MTK_BT_MISC 0x70002510 #define MTK_BT_SUBSYS_RST 0x70002610 @@ -3924,6 +3999,7 @@ static int btusb_probe(struct usb_interface *intf, data->recv_event = hci_recv_frame; data->recv_bulk = btusb_recv_bulk; + data->recv_isoc = btusb_recv_isoc; if (id->driver_info & BTUSB_INTEL_COMBINED) { /* Allocate extra space for Intel device */ @@ -4097,6 +4173,8 @@ static int btusb_probe(struct usb_interface *intf, hdev->shutdown = btrtl_shutdown_realtek; hdev->cmd_timeout = btusb_rtl_cmd_timeout; + data->recv_isoc = btusb_recv_isoc_realtek; + /* Realtek devices need to set remote wakeup on auto-suspend */ set_bit(BTUSB_WAKEUP_AUTOSUSPEND, &data->flags); set_bit(BTUSB_USE_ALT3_FOR_WBS, &data->flags);