From patchwork Wed Jun 30 08:07:58 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "K, Kiran" X-Patchwork-Id: 12351543 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-14.0 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,UNWANTED_LANGUAGE_BODY, URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id EE8FCC11F65 for ; Wed, 30 Jun 2021 08:03:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C9AE161C82 for ; Wed, 30 Jun 2021 08:03:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233048AbhF3IGY (ORCPT ); Wed, 30 Jun 2021 04:06:24 -0400 Received: from mga07.intel.com ([134.134.136.100]:5410 "EHLO mga07.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232966AbhF3IGX (ORCPT ); Wed, 30 Jun 2021 04:06:23 -0400 X-IronPort-AV: E=McAfee;i="6200,9189,10030"; a="272164630" X-IronPort-AV: E=Sophos;i="5.83,311,1616482800"; d="scan'208";a="272164630" Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by orsmga105.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 30 Jun 2021 01:03:54 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.83,311,1616482800"; d="scan'208";a="643997930" Received: from intel-lenovo-legion-y540-15irh-pg0.iind.intel.com ([10.224.186.95]) by fmsmga005.fm.intel.com with ESMTP; 30 Jun 2021 01:03:52 -0700 From: Kiran K To: linux-bluetooth@vger.kernel.org Cc: Kiran K , Chethan T N , Srivatsa Ravishankar Subject: [PATCH v10 01/10] Bluetooth: Enumerate local supported codec and cache details Date: Wed, 30 Jun 2021 13:37:58 +0530 Message-Id: <20210630080807.12600-1-kiran.k@intel.com> X-Mailer: git-send-email 2.17.1 Precedence: bulk List-ID: X-Mailing-List: linux-bluetooth@vger.kernel.org Move reading of supported local codecs into a separate init function, query codecs capabilities and cache the data Signed-off-by: Kiran K Signed-off-by: Chethan T N Signed-off-by: Srivatsa Ravishankar --- * changes in v10: - define Kconfig to control offload feature at build time - fix review comments * changes in v9: - use shortname vnd instead of ven * changes in v8: - add comments - split __u8 codec_id[5] into {__u8 id; __le16 cid, vid } - address review comment related codec caps structure * changes in v7: - keep codec enumeration call in hci_init instead of having a separate function - Remove unused bitmasks defined for LE transports * changes in v6: - fix compiler warning reported for ARCH=arc * changes in v5: - fix review comments - move code used to read standard/vendor codecs caps into single function * changes in v4: - convert reading of codecs and codecs caps calls from async to sync * changes in v3 move codec enumeration into a new init function * changes in v2 add skb length check before accessing data include/net/bluetooth/hci.h | 41 ++++++ include/net/bluetooth/hci_core.h | 23 ++++ net/bluetooth/Kconfig | 11 ++ net/bluetooth/hci_core.c | 207 ++++++++++++++++++++++++++++++- 4 files changed, 278 insertions(+), 4 deletions(-) diff --git a/include/net/bluetooth/hci.h b/include/net/bluetooth/hci.h index b80415011dcd..f76849c8eafd 100644 --- a/include/net/bluetooth/hci.h +++ b/include/net/bluetooth/hci.h @@ -1307,6 +1307,28 @@ struct hci_rp_read_data_block_size { } __packed; #define HCI_OP_READ_LOCAL_CODECS 0x100b +struct hci_std_codecs { + __u8 num; + __u8 codec[]; +} __packed; + +struct hci_vnd_codec { + /* company id */ + __le16 cid; + /* vendor codec id */ + __le16 vid; +} __packed; + +struct hci_vnd_codecs { + __u8 num; + struct hci_vnd_codec codec[]; +} __packed; + +struct hci_rp_read_local_supported_codecs { + __u8 status; + struct hci_std_codecs std_codecs; + struct hci_vnd_codecs vnd_codecs; +} __packed; #define HCI_OP_READ_LOCAL_PAIRING_OPTS 0x100c struct hci_rp_read_local_pairing_opts { @@ -1315,6 +1337,25 @@ struct hci_rp_read_local_pairing_opts { __u8 max_key_size; } __packed; +#define HCI_OP_READ_LOCAL_CODEC_CAPS 0x100e +struct hci_op_read_local_codec_caps { + __u8 id; + __le16 cid; + __le16 vid; + __u8 transport; + __u8 direction; +} __packed; + +struct hci_codec_caps { + __u8 len; + __u8 data[]; +} __packed; + +struct hci_rp_read_local_codec_caps { + __u8 status; + __u8 num_caps; +} __packed; + #define HCI_OP_READ_PAGE_SCAN_ACTIVITY 0x0c1b struct hci_rp_read_page_scan_activity { __u8 status; diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h index a53e94459ecd..7b8d603358b9 100644 --- a/include/net/bluetooth/hci_core.h +++ b/include/net/bluetooth/hci_core.h @@ -131,6 +131,19 @@ struct bdaddr_list { u8 bdaddr_type; }; +#if IS_ENABLED(CONFIG_BT_OFFLOAD_CODECS) +struct codec_list { + struct list_head list; + u8 id; + __le16 cid; + __le16 vid; + u8 transport; + u8 num_caps; + u32 len; + struct hci_codec_caps caps[]; +}; +#endif + struct bdaddr_list_with_irk { struct list_head list; bdaddr_t bdaddr; @@ -535,6 +548,9 @@ struct hci_dev { struct list_head pend_le_conns; struct list_head pend_le_reports; struct list_head blocked_keys; +#if IS_ENABLED(CONFIG_BT_OFFLOAD_CODECS) + struct list_head local_codecs; +#endif struct hci_dev_stats stat; @@ -1849,4 +1865,11 @@ void hci_copy_identity_address(struct hci_dev *hdev, bdaddr_t *bdaddr, #define SCO_AIRMODE_CVSD 0x0000 #define SCO_AIRMODE_TRANSP 0x0003 +#if IS_ENABLED(CONFIG_BT_OFFLOAD_CODECS) +#define LOCAL_CODEC_ACL_MASK BIT(0) +#define LOCAL_CODEC_SCO_MASK BIT(1) + +#define TRANSPORT_TYPE_MAX 0x04 +#endif + #endif /* __HCI_CORE_H */ diff --git a/net/bluetooth/Kconfig b/net/bluetooth/Kconfig index e0ab4cd7afc3..1069623f36c4 100644 --- a/net/bluetooth/Kconfig +++ b/net/bluetooth/Kconfig @@ -92,6 +92,17 @@ config BT_LEDS This option selects a few LED triggers for different Bluetooth events. +config BT_OFFLOAD_CODECS + bool "Enable offload codecs" + depends on BT && BT_BREDR + default n + help + This option enables offload codecs if controller supports. + When this option is enabled, user space audio modules can + query offload codecs and can set the codec to be used for + specific use case. + + config BT_MSFTEXT bool "Enable Microsoft extensions" depends on BT diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c index 2560ed2f144d..2657d84e8240 100644 --- a/net/bluetooth/hci_core.c +++ b/net/bluetooth/hci_core.c @@ -838,10 +838,6 @@ static int hci_init4_req(struct hci_request *req, unsigned long opt) if (hdev->commands[22] & 0x04) hci_set_event_mask_page_2(req); - /* Read local codec list if the HCI command is supported */ - if (hdev->commands[29] & 0x20) - hci_req_add(req, HCI_OP_READ_LOCAL_CODECS, 0, NULL); - /* Read local pairing options if the HCI command is supported */ if (hdev->commands[41] & 0x08) hci_req_add(req, HCI_OP_READ_LOCAL_PAIRING_OPTS, 0, NULL); @@ -907,6 +903,197 @@ static int hci_init4_req(struct hci_request *req, unsigned long opt) return 0; } +#if IS_ENABLED(CONFIG_BT_OFFLOAD_CODECS) +static int hci_codec_list_add(struct list_head *list, + struct hci_op_read_local_codec_caps *sent, + struct hci_rp_read_local_codec_caps *rp, + void *caps, + __u32 len) +{ + struct codec_list *entry; + + entry = kzalloc(sizeof(*entry) + len, GFP_KERNEL); + if (!entry) + return -ENOMEM; + + entry->id = sent->id; + if (sent->id == 0xFF) { + entry->cid = __le16_to_cpu(sent->cid); + entry->vid = __le16_to_cpu(sent->vid); + } + entry->transport = sent->transport; + entry->len = len; + entry->num_caps = rp->num_caps; + if (rp->num_caps) + memcpy(entry->caps, caps, len); + list_add(&entry->list, list); + + return 0; +} + +static void hci_codec_list_clear(struct list_head *codec_list) +{ + struct codec_list *c, *n; + + list_for_each_entry_safe(c, n, codec_list, list) { + list_del(&c->list); + kfree(c); + } +} + +static void hci_read_codec_capabilities(struct hci_dev *hdev, void *codec_id, + __u8 transport, bool is_vnd_codec) +{ + struct hci_op_read_local_codec_caps cmd; + __u8 i; + + memset(&cmd, 0, sizeof(cmd)); + + if (is_vnd_codec) { + struct hci_vnd_codec *vnd_codec; + + vnd_codec = codec_id; + cmd.id = 0xFF; + cmd.cid = vnd_codec->cid; + cmd.vid = vnd_codec->vid; + } else { + cmd.id = *(__u8 *)codec_id; + } + + cmd.direction = 0x00; + + for (i = 0; i < TRANSPORT_TYPE_MAX; i++) { + if (transport & BIT(i)) { + struct hci_rp_read_local_codec_caps *rp; + struct hci_codec_caps *caps; + struct sk_buff *skb; + __u8 j; + __u32 len; + + cmd.transport = i; + skb = __hci_cmd_sync(hdev, HCI_OP_READ_LOCAL_CODEC_CAPS, + sizeof(cmd), &cmd, + HCI_CMD_TIMEOUT); + if (IS_ERR(skb)) { + bt_dev_err(hdev, "Failed to read codec capabilities (%ld)", + PTR_ERR(skb)); + continue; + } + + if (skb->len < sizeof(*rp)) + goto error; + + rp = (void *)skb->data; + + if (rp->status) + goto error; + + if (!rp->num_caps) { + len = 0; + /* this codec doesn't have capabilities */ + goto skip_caps_parse; + } + + skb_pull(skb, sizeof(*rp)); + + for (j = 0, len = 0; j < rp->num_caps; j++) { + caps = (void *)skb->data; + if (skb->len < sizeof(*caps)) + goto error; + if (skb->len < caps->len) + goto error; + len += sizeof(caps->len) + caps->len; + skb_pull(skb, sizeof(caps->len) + caps->len); + } + +skip_caps_parse: + hci_dev_lock(hdev); + hci_codec_list_add(&hdev->local_codecs, &cmd, rp, + (__u8 *)rp + sizeof(*rp), len); + hci_dev_unlock(hdev); +error: + kfree_skb(skb); + } + } +} + +static void hci_codec_list_parse(struct hci_dev *hdev, __u8 num_codecs, + void *codec_list, bool is_vnd_codec) +{ + __u8 i; + + for (i = 0; i < num_codecs; i++) { + if (!is_vnd_codec) { + struct hci_std_codecs *codecs = codec_list; + + hci_read_codec_capabilities(hdev, &codecs->codec[i], + LOCAL_CODEC_ACL_MASK, + is_vnd_codec); + } else { + struct hci_vnd_codecs *codecs = codec_list; + + hci_read_codec_capabilities(hdev, &codecs->codec[i], + LOCAL_CODEC_ACL_MASK, + is_vnd_codec); + } + } +} + +static void hci_read_supported_codecs(struct hci_dev *hdev) +{ + struct sk_buff *skb; + struct hci_rp_read_local_supported_codecs *rp; + struct hci_std_codecs *std_codecs; + struct hci_vnd_codecs *vnd_codecs; + + skb = __hci_cmd_sync(hdev, HCI_OP_READ_LOCAL_CODECS, 0, NULL, + HCI_CMD_TIMEOUT); + + if (IS_ERR(skb)) { + bt_dev_err(hdev, "Failed to read local supported codecs (%ld)", + PTR_ERR(skb)); + return; + } + + if (skb->len < sizeof(*rp)) + goto error; + + rp = (void *)skb->data; + + if (rp->status) + goto error; + + skb_pull(skb, sizeof(rp->status)); + + std_codecs = (void *)skb->data; + + /* validate codecs length before accessing */ + if (skb->len < flex_array_size(std_codecs, codec, std_codecs->num) + + sizeof(std_codecs->num)) + goto error; + + /* enumerate codec capabilities of standard codecs */ + hci_codec_list_parse(hdev, std_codecs->num, std_codecs, false); + + skb_pull(skb, flex_array_size(std_codecs, codec, std_codecs->num) + + sizeof(std_codecs->num)); + + vnd_codecs = (void *)skb->data; + + /* validate vendor codecs length before accessing */ + if (skb->len < + flex_array_size(vnd_codecs, codec, vnd_codecs->num) + + sizeof(vnd_codecs->num)) + goto error; + + /* enumerate vendor codec capabilities */ + hci_codec_list_parse(hdev, vnd_codecs->num, vnd_codecs, true); + +error: + kfree_skb(skb); +} +#endif + static int __hci_init(struct hci_dev *hdev) { int err; @@ -937,6 +1124,12 @@ static int __hci_init(struct hci_dev *hdev) if (err < 0) return err; +#if IS_ENABLED(CONFIG_BT_OFFLOAD_CODECS) + /* Read local codec list if the HCI command is supported */ + if (hdev->commands[29] & 0x20) + hci_read_supported_codecs(hdev); +#endif + /* This function is only called when the controller is actually in * configured state. When the controller is marked as unconfigured, * this initialization procedure is not run. @@ -1841,6 +2034,9 @@ int hci_dev_do_close(struct hci_dev *hdev) memset(hdev->eir, 0, sizeof(hdev->eir)); memset(hdev->dev_class, 0, sizeof(hdev->dev_class)); bacpy(&hdev->random_addr, BDADDR_ANY); +#if IS_ENABLED(CONFIG_BT_OFFLOAD_CODECS) + hci_codec_list_clear(&hdev->local_codecs); +#endif hci_req_sync_unlock(hdev); @@ -3843,6 +4039,9 @@ struct hci_dev *hci_alloc_dev(void) INIT_LIST_HEAD(&hdev->adv_instances); INIT_LIST_HEAD(&hdev->blocked_keys); +#if IS_ENABLED(CONFIG_BT_OFFLOAD_CODECS) + INIT_LIST_HEAD(&hdev->local_codecs); +#endif INIT_WORK(&hdev->rx_work, hci_rx_work); INIT_WORK(&hdev->cmd_work, hci_cmd_work); INIT_WORK(&hdev->tx_work, hci_tx_work);