Bluetooth: Add offload feature under experimental flag

Allow user level process to enable / disable codec offload
feature through mgmt interface. By default offload codec feature
is disabled.

Signed-off-by: Kiran K <kiran.k@intel.com>
Reviewed-by: Chethan T N <chethan.tumkur.narayan@intel.com>
Reviewed-by: Srivatsa Ravishankar <ravishankar.srivatsa@intel.com>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>

diff --git a/net/bluetooth/mgmt.c b/net/bluetooth/mgmt.c
index af1e65c4e00e9756cdb9ba2bc1df52d2873d52a6..df5e16d7e313e33caf27f7f2991f0eb549d9c4de 100644 (file)
--- a/net/bluetooth/mgmt.c
+++ b/net/bluetooth/mgmt.c
@@ -3797,6 +3797,12 @@ static const u8 quality_report_uuid[16] = {
        0x2d, 0x49, 0x06, 0x75, 0xbc, 0x59, 0x08, 0x33,
 };
 
+/* a6695ace-ee7f-4fb9-881a-5fac66c629af */
+static const u8 offload_codecs_uuid[16] = {
+       0xaf, 0x29, 0xc6, 0x66, 0xac, 0x5f, 0x1a, 0x88,
+       0xb9, 0x4f, 0x7f, 0xee, 0xce, 0x5a, 0x69, 0xa6,
+};
+
 /* 671b10b5-42c0-4696-9227-eb28d1b049d6 */
 static const u8 simult_central_periph_uuid[16] = {
        0xd6, 0x49, 0xb0, 0xd1, 0x28, 0xeb, 0x27, 0x92,
@@ -3812,7 +3818,7 @@ static const u8 rpa_resolution_uuid[16] = {
 static int read_exp_features_info(struct sock *sk, struct hci_dev *hdev,
                                  void *data, u16 data_len)
 {
-       char buf[82];   /* Enough space for 4 features: 2 + 20 * 4 */
+       char buf[102];   /* Enough space for 5 features: 2 + 20 * 5 */
        struct mgmt_rp_read_exp_features_info *rp = (void *)buf;
        u16 idx = 0;
        u32 flags;
@@ -3874,6 +3880,26 @@ static int read_exp_features_info(struct sock *sk, struct hci_dev *hdev,
                idx++;
        }
 
+       if (hdev) {
+               if (hdev->get_data_path_id) {
+                       /* BIT(0): indicating if offload codecs are
+                        * supported by controller.
+                        */
+                       flags = BIT(0);
+
+                       /* BIT(1): indicating if codec offload feature
+                        * is enabled.
+                        */
+                       if (hci_dev_test_flag(hdev, HCI_OFFLOAD_CODECS_ENABLED))
+                               flags |= BIT(1);
+               } else {
+                       flags = 0;
+               }
+               memcpy(rp->features[idx].uuid, offload_codecs_uuid, 16);
+               rp->features[idx].flags = cpu_to_le32(flags);
+               idx++;
+       }
+
        rp->feature_count = cpu_to_le16(idx);
 
        /* After reading the experimental features information, enable
@@ -4152,6 +4178,77 @@ unlock_quality_report:
        return err;
 }
 
+static int exp_offload_codec_feature_changed(bool enabled, struct sock *skip)
+{
+       struct mgmt_ev_exp_feature_changed ev;
+
+       memset(&ev, 0, sizeof(ev));
+       memcpy(ev.uuid, offload_codecs_uuid, 16);
+       ev.flags = cpu_to_le32(enabled ? BIT(0) : 0);
+
+       return mgmt_limited_event(MGMT_EV_EXP_FEATURE_CHANGED, NULL,
+                                 &ev, sizeof(ev),
+                                 HCI_MGMT_EXP_FEATURE_EVENTS, skip);
+}
+
+static int set_offload_codec_func(struct sock *sk, struct hci_dev *hdev,
+                                 struct mgmt_cp_set_exp_feature *cp,
+                                 u16 data_len)
+{
+       bool val, changed;
+       int err;
+       struct mgmt_rp_set_exp_feature rp;
+
+       /* Command requires to use a valid controller index */
+       if (!hdev)
+               return mgmt_cmd_status(sk, MGMT_INDEX_NONE,
+                                      MGMT_OP_SET_EXP_FEATURE,
+                                      MGMT_STATUS_INVALID_INDEX);
+
+       /* Parameters are limited to a single octet */
+       if (data_len != MGMT_SET_EXP_FEATURE_SIZE + 1)
+               return mgmt_cmd_status(sk, hdev->id,
+                                      MGMT_OP_SET_EXP_FEATURE,
+                                      MGMT_STATUS_INVALID_PARAMS);
+
+       /* Only boolean on/off is supported */
+       if (cp->param[0] != 0x00 && cp->param[0] != 0x01)
+               return mgmt_cmd_status(sk, hdev->id,
+                                      MGMT_OP_SET_EXP_FEATURE,
+                                      MGMT_STATUS_INVALID_PARAMS);
+
+       val = !!cp->param[0];
+       changed = (val != hci_dev_test_flag(hdev, HCI_OFFLOAD_CODECS_ENABLED));
+
+       if (!hdev->get_data_path_id) {
+               return mgmt_cmd_status(sk, hdev->id,
+                                      MGMT_OP_SET_EXP_FEATURE,
+                                      MGMT_STATUS_NOT_SUPPORTED);
+       }
+
+       if (changed) {
+               if (val)
+                       hci_dev_set_flag(hdev, HCI_OFFLOAD_CODECS_ENABLED);
+               else
+                       hci_dev_clear_flag(hdev, HCI_OFFLOAD_CODECS_ENABLED);
+       }
+
+       bt_dev_info(hdev, "offload codecs enable %d changed %d",
+                   val, changed);
+
+       memcpy(rp.uuid, offload_codecs_uuid, 16);
+       rp.flags = cpu_to_le32(val ? BIT(0) : 0);
+       hci_sock_set_flag(sk, HCI_MGMT_EXP_FEATURE_EVENTS);
+       err = mgmt_cmd_complete(sk, hdev->id,
+                               MGMT_OP_SET_EXP_FEATURE, 0,
+                               &rp, sizeof(rp));
+
+       if (changed)
+               exp_offload_codec_feature_changed(val, sk);
+
+       return err;
+}
+
 static const struct mgmt_exp_feature {
        const u8 *uuid;
        int (*set_func)(struct sock *sk, struct hci_dev *hdev,
@@ -4163,6 +4260,7 @@ static const struct mgmt_exp_feature {
 #endif
        EXP_FEAT(rpa_resolution_uuid, set_rpa_resolution_func),
        EXP_FEAT(quality_report_uuid, set_quality_report_func),
+       EXP_FEAT(offload_codecs_uuid, set_offload_codec_func),
 
        /* end with a null feature */
        EXP_FEAT(NULL, NULL)