[PATCH v8 3/5] Bluetooth: refactor set_exp_feature with a feature table
From: Joseph Hwang
Date: Fri Aug 13 2021 - 12:53:14 EST
This patch refactors the set_exp_feature with a feature table
consisting of UUIDs and the corresponding callback functions.
In this way, a new experimental feature setting function can be
simply added with its UUID and callback function.
Signed-off-by: Joseph Hwang <josephsih@xxxxxxxxxxxx>
---
Changes in v8:
- Refactor the set_exp_feature function with a feature table.
- This is a new patch added in v8.
net/bluetooth/mgmt.c | 248 +++++++++++++++++++++++++------------------
1 file changed, 142 insertions(+), 106 deletions(-)
diff --git a/net/bluetooth/mgmt.c b/net/bluetooth/mgmt.c
index 1e21e014efd2..ffd526b2beab 100644
--- a/net/bluetooth/mgmt.c
+++ b/net/bluetooth/mgmt.c
@@ -3806,7 +3806,7 @@ 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[62]; /* Enough space for 3 features */
+ char buf[62]; /* Enough space for 3 features */
struct mgmt_rp_read_exp_features_info *rp = (void *)buf;
u16 idx = 0;
u32 flags;
@@ -3892,150 +3892,186 @@ static int exp_debug_feature_changed(bool enabled, struct sock *skip)
}
#endif
-static int set_exp_feature(struct sock *sk, struct hci_dev *hdev,
- void *data, u16 data_len)
+#define EXP_FEAT(_uuid, _set_func) \
+{ \
+ .uuid = _uuid, \
+ .set_func = _set_func, \
+}
+
+/* The zero key uuid is special. Multiple exp features are set through it. */
+static int set_zero_key_func(struct sock *sk, struct hci_dev *hdev,
+ struct mgmt_cp_set_exp_feature *cp, u16 data_len)
{
- struct mgmt_cp_set_exp_feature *cp = data;
struct mgmt_rp_set_exp_feature rp;
- bt_dev_dbg(hdev, "sock %p", sk);
-
- if (!memcmp(cp->uuid, ZERO_KEY, 16)) {
- memset(rp.uuid, 0, 16);
- rp.flags = cpu_to_le32(0);
+ memset(rp.uuid, 0, 16);
+ rp.flags = cpu_to_le32(0);
#ifdef CONFIG_BT_FEATURE_DEBUG
- if (!hdev) {
- bool changed = bt_dbg_get();
+ if (!hdev) {
+ bool changed = bt_dbg_get();
- bt_dbg_set(false);
+ bt_dbg_set(false);
- if (changed)
- exp_debug_feature_changed(false, sk);
- }
+ if (changed)
+ exp_debug_feature_changed(false, sk);
+ }
#endif
- if (hdev && use_ll_privacy(hdev) && !hdev_is_powered(hdev)) {
- bool changed = hci_dev_test_flag(hdev,
- HCI_ENABLE_LL_PRIVACY);
+ if (hdev && use_ll_privacy(hdev) && !hdev_is_powered(hdev)) {
+ bool changed = hci_dev_test_flag(hdev, HCI_ENABLE_LL_PRIVACY);
- hci_dev_clear_flag(hdev, HCI_ENABLE_LL_PRIVACY);
+ hci_dev_clear_flag(hdev, HCI_ENABLE_LL_PRIVACY);
- if (changed)
- exp_ll_privacy_feature_changed(false, hdev, sk);
- }
+ if (changed)
+ exp_ll_privacy_feature_changed(false, hdev, sk);
+ }
- hci_sock_set_flag(sk, HCI_MGMT_EXP_FEATURE_EVENTS);
+ hci_sock_set_flag(sk, HCI_MGMT_EXP_FEATURE_EVENTS);
- return mgmt_cmd_complete(sk, hdev ? hdev->id : MGMT_INDEX_NONE,
- MGMT_OP_SET_EXP_FEATURE, 0,
- &rp, sizeof(rp));
- }
+ return mgmt_cmd_complete(sk, hdev ? hdev->id : MGMT_INDEX_NONE,
+ MGMT_OP_SET_EXP_FEATURE, 0,
+ &rp, sizeof(rp));
+}
#ifdef CONFIG_BT_FEATURE_DEBUG
- if (!memcmp(cp->uuid, debug_uuid, 16)) {
- bool val, changed;
- int err;
+static int set_debug_func(struct sock *sk, struct hci_dev *hdev,
+ struct mgmt_cp_set_exp_feature *cp, u16 data_len)
+{
+ struct mgmt_rp_set_exp_feature rp;
- /* Command requires to use the non-controller index */
- if (hdev)
- return mgmt_cmd_status(sk, hdev->id,
- MGMT_OP_SET_EXP_FEATURE,
- MGMT_STATUS_INVALID_INDEX);
+ bool val, changed;
+ int err;
- /* Parameters are limited to a single octet */
- if (data_len != MGMT_SET_EXP_FEATURE_SIZE + 1)
- return mgmt_cmd_status(sk, MGMT_INDEX_NONE,
- MGMT_OP_SET_EXP_FEATURE,
- MGMT_STATUS_INVALID_PARAMS);
+ /* Command requires to use the non-controller index */
+ if (hdev)
+ return mgmt_cmd_status(sk, hdev->id,
+ MGMT_OP_SET_EXP_FEATURE,
+ MGMT_STATUS_INVALID_INDEX);
- /* Only boolean on/off is supported */
- if (cp->param[0] != 0x00 && cp->param[0] != 0x01)
- return mgmt_cmd_status(sk, MGMT_INDEX_NONE,
- MGMT_OP_SET_EXP_FEATURE,
- MGMT_STATUS_INVALID_PARAMS);
+ /* Parameters are limited to a single octet */
+ if (data_len != MGMT_SET_EXP_FEATURE_SIZE + 1)
+ return mgmt_cmd_status(sk, MGMT_INDEX_NONE,
+ MGMT_OP_SET_EXP_FEATURE,
+ MGMT_STATUS_INVALID_PARAMS);
- val = !!cp->param[0];
- changed = val ? !bt_dbg_get() : bt_dbg_get();
- bt_dbg_set(val);
+ /* Only boolean on/off is supported */
+ if (cp->param[0] != 0x00 && cp->param[0] != 0x01)
+ return mgmt_cmd_status(sk, MGMT_INDEX_NONE,
+ MGMT_OP_SET_EXP_FEATURE,
+ MGMT_STATUS_INVALID_PARAMS);
- memcpy(rp.uuid, debug_uuid, 16);
- rp.flags = cpu_to_le32(val ? BIT(0) : 0);
+ val = !!cp->param[0];
+ changed = val ? !bt_dbg_get() : bt_dbg_get();
+ bt_dbg_set(val);
- hci_sock_set_flag(sk, HCI_MGMT_EXP_FEATURE_EVENTS);
+ memcpy(rp.uuid, debug_uuid, 16);
+ rp.flags = cpu_to_le32(val ? BIT(0) : 0);
- err = mgmt_cmd_complete(sk, MGMT_INDEX_NONE,
- MGMT_OP_SET_EXP_FEATURE, 0,
- &rp, sizeof(rp));
+ hci_sock_set_flag(sk, HCI_MGMT_EXP_FEATURE_EVENTS);
- if (changed)
- exp_debug_feature_changed(val, sk);
+ err = mgmt_cmd_complete(sk, MGMT_INDEX_NONE,
+ MGMT_OP_SET_EXP_FEATURE, 0,
+ &rp, sizeof(rp));
- return err;
- }
+ if (changed)
+ exp_debug_feature_changed(val, sk);
+
+ return err;
+}
#endif
- if (!memcmp(cp->uuid, rpa_resolution_uuid, 16)) {
- bool val, changed;
- int err;
- u32 flags;
+static int set_rpa_resolution_func(struct sock *sk, struct hci_dev *hdev,
+ struct mgmt_cp_set_exp_feature *cp,
+ u16 data_len)
+{
+ struct mgmt_rp_set_exp_feature rp;
+ bool val, changed;
+ int err;
+ u32 flags;
+
+ /* Command requires to use the controller index */
+ if (!hdev)
+ return mgmt_cmd_status(sk, MGMT_INDEX_NONE,
+ MGMT_OP_SET_EXP_FEATURE,
+ MGMT_STATUS_INVALID_INDEX);
- /* Command requires to use the controller index */
- if (!hdev)
- return mgmt_cmd_status(sk, MGMT_INDEX_NONE,
- MGMT_OP_SET_EXP_FEATURE,
- MGMT_STATUS_INVALID_INDEX);
+ /* Changes can only be made when controller is powered down */
+ if (hdev_is_powered(hdev))
+ return mgmt_cmd_status(sk, hdev->id,
+ MGMT_OP_SET_EXP_FEATURE,
+ MGMT_STATUS_REJECTED);
- /* Changes can only be made when controller is powered down */
- if (hdev_is_powered(hdev))
- return mgmt_cmd_status(sk, hdev->id,
- MGMT_OP_SET_EXP_FEATURE,
- MGMT_STATUS_REJECTED);
+ /* 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);
- /* 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);
- /* 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];
- val = !!cp->param[0];
+ if (val) {
+ changed = !hci_dev_test_flag(hdev, HCI_ENABLE_LL_PRIVACY);
+ hci_dev_set_flag(hdev, HCI_ENABLE_LL_PRIVACY);
+ hci_dev_clear_flag(hdev, HCI_ADVERTISING);
- if (val) {
- changed = !hci_dev_test_flag(hdev,
- HCI_ENABLE_LL_PRIVACY);
- hci_dev_set_flag(hdev, HCI_ENABLE_LL_PRIVACY);
- hci_dev_clear_flag(hdev, HCI_ADVERTISING);
+ /* Enable LL privacy + supported settings changed */
+ flags = BIT(0) | BIT(1);
+ } else {
+ changed = hci_dev_test_flag(hdev, HCI_ENABLE_LL_PRIVACY);
+ hci_dev_clear_flag(hdev, HCI_ENABLE_LL_PRIVACY);
- /* Enable LL privacy + supported settings changed */
- flags = BIT(0) | BIT(1);
- } else {
- changed = hci_dev_test_flag(hdev,
- HCI_ENABLE_LL_PRIVACY);
- hci_dev_clear_flag(hdev, HCI_ENABLE_LL_PRIVACY);
+ /* Disable LL privacy + supported settings changed */
+ flags = BIT(1);
+ }
- /* Disable LL privacy + supported settings changed */
- flags = BIT(1);
- }
+ memcpy(rp.uuid, rpa_resolution_uuid, 16);
+ rp.flags = cpu_to_le32(flags);
- memcpy(rp.uuid, rpa_resolution_uuid, 16);
- rp.flags = cpu_to_le32(flags);
+ hci_sock_set_flag(sk, HCI_MGMT_EXP_FEATURE_EVENTS);
- 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));
- err = mgmt_cmd_complete(sk, hdev->id,
- MGMT_OP_SET_EXP_FEATURE, 0,
- &rp, sizeof(rp));
+ if (changed)
+ exp_ll_privacy_feature_changed(val, hdev, sk);
- if (changed)
- exp_ll_privacy_feature_changed(val, hdev, sk);
+ return err;
+}
- return err;
+static const struct mgmt_exp_feature {
+ const u8 *uuid;
+ int (*set_func)(struct sock *sk, struct hci_dev *hdev,
+ struct mgmt_cp_set_exp_feature *cp, u16 data_len);
+} exp_features[] = {
+ EXP_FEAT(ZERO_KEY, set_zero_key_func),
+#ifdef CONFIG_BT_FEATURE_DEBUG
+ EXP_FEAT(debug_uuid, set_debug_func),
+#endif
+ EXP_FEAT(rpa_resolution_uuid, set_rpa_resolution_func),
+
+ /* end with a null feature */
+ EXP_FEAT(NULL, NULL)
+};
+
+static int set_exp_feature(struct sock *sk, struct hci_dev *hdev,
+ void *data, u16 data_len)
+{
+ struct mgmt_cp_set_exp_feature *cp = data;
+ size_t i = 0;
+
+ bt_dev_dbg(hdev, "sock %p", sk);
+
+ for (i = 0; exp_features[i].uuid; i++) {
+ if (!memcmp(cp->uuid, exp_features[i].uuid, 16)) {
+ return exp_features[i].set_func(sk, hdev, cp, data_len);
}
return mgmt_cmd_status(sk, hdev ? hdev->id : MGMT_INDEX_NONE,
--
2.33.0.rc1.237.g0d66db33f3-goog