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bluetooth: host: Add API to get a connection's UATT MTU

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Similar to bt_att_get_mtu but only considering the Unenhanced ATT
channel.

Signed-off-by: Luis Ubieda <luisf@croxel.com>
This commit is contained in:
Luis Ubieda 2024-08-10 16:48:51 -04:00 • committed by Fabio Baltieri
commit 775cd201c3
4 changed files with 44 additions and 0 deletions
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17
include/zephyr/bluetooth/gatt.h
View file

@ -1488,6 +1488,23 @@ bool bt_gatt_is_subscribed(struct bt_conn *conn,
*/
uint16_t bt_gatt_get_mtu(struct bt_conn *conn);
/** @brief Get Unenhanced ATT (UATT) MTU for a connection
*
* Get UATT connection MTU.
*
* The ATT_MTU defines the largest size of an ATT PDU, encompassing the ATT
* opcode, additional fields, and any attribute value payload. Consequently,
* the maximum size of a value payload is less and varies based on the type
* of ATT PDU. For example, in an ATT_HANDLE_VALUE_NTF PDU, the Attribute Value
* field can contain up to ATT_MTU - 3 octets (size of opcode and handle).
*
* @param conn Connection object.
*
* @return 0 if @p conn does not have an UATT ATT_MTU (e.g: disconnected).
* @return Current UATT ATT_MTU.
*/
uint16_t bt_gatt_get_uatt_mtu(struct bt_conn *conn);
/** @} */
/**

21
subsys/bluetooth/host/att.c
View file

@ -3832,6 +3832,27 @@ uint16_t bt_att_get_mtu(struct bt_conn *conn)
return mtu;
}
uint16_t bt_att_get_uatt_mtu(struct bt_conn *conn)
{
struct bt_att_chan *chan, *tmp;
struct bt_att *att;
att = att_get(conn);
if (!att) {
return 0;
}
SYS_SLIST_FOR_EACH_CONTAINER_SAFE(&att->chans, chan, tmp, node) {
if (!bt_att_is_enhanced(chan)) {
return bt_att_mtu(chan);
}
}
LOG_WRN("No UATT channel found in %p", conn);
return 0;
}
static void att_chan_mtu_updated(struct bt_att_chan *updated_chan)
{
struct bt_att *att = updated_chan->att;

1
subsys/bluetooth/host/att_internal.h
View file

@ -293,6 +293,7 @@ struct bt_att_req {
void bt_att_init(void);
uint16_t bt_att_get_mtu(struct bt_conn *conn);
uint16_t bt_att_get_uatt_mtu(struct bt_conn *conn);
struct net_buf *bt_att_create_pdu(struct bt_conn *conn, uint8_t op,
size_t len);

5
subsys/bluetooth/host/gatt.c
View file

@ -3164,6 +3164,11 @@ uint16_t bt_gatt_get_mtu(struct bt_conn *conn)
return bt_att_get_mtu(conn);
}
uint16_t bt_gatt_get_uatt_mtu(struct bt_conn *conn)
{
return bt_att_get_uatt_mtu(conn);
}
uint8_t bt_gatt_check_perm(struct bt_conn *conn, const struct bt_gatt_attr *attr,
uint16_t mask)
{