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bluetooth: Add support for reconfiguring L2CAP channels

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This allows application to increase channel's MTU and (in some cases)
MPS. When channel gets reconfigured dedicated callback is called to
inform application.

Signed-off-by: Szymon Janc <szymon.janc@codecoup.pl>
This commit is contained in:
Szymon Janc 2021-09-17 20:33:53 +02:00 • committed by Carles Cufí
commit c589994dc0
2 changed files with 164 additions and 0 deletions
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28
include/bluetooth/l2cap.h
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@ -177,6 +177,10 @@ struct bt_l2cap_le_chan {
* @ref BT_L2CAP_SDU_RX_MTU by the stack.
*/
struct bt_l2cap_le_endpoint rx;
/** Pending RX MTU on ECFC reconfigure, used internally by stack */
uint16_t pending_rx_mtu;
/** Channel Transmission Endpoint */
struct bt_l2cap_le_endpoint tx;
/** Channel Transmission queue */
@ -316,6 +320,16 @@ struct bt_l2cap_chan_ops {
* references to the channel object.
*/
void (*released)(struct bt_l2cap_chan *chan);
/** @brief Channel reconfigured callback
*
* If this callback is provided it will be called whenever peer or
* local device requested reconfiguration. Application may check
* updated MTU and MPS values by inspecting chan->le endpoints.
*
* @param chan The channel which was reconfigured
*/
void (*reconfigured)(struct bt_l2cap_chan *chan);
};
/** @def BT_L2CAP_CHAN_SEND_RESERVE
@ -414,6 +428,20 @@ int bt_l2cap_br_server_register(struct bt_l2cap_server *server);
int bt_l2cap_ecred_chan_connect(struct bt_conn *conn,
struct bt_l2cap_chan **chans, uint16_t psm);
/** @brief Reconfigure Enhanced Credit Based L2CAP channels
*
* Reconfigure up to 5 L2CAP channels. Channels must be from the same bt_conn.
* Once reconfiguration is completed each channel reconfigured() callback will
* be called. MTU cannot be decreased on any of provided channels.
*
* @param chans Array of channel objects. Null-terminated. Elements after the
* first 5 are silently ignored.
* @param mtu Channel MTU to reconfigure to.
*
* @return 0 in case of success or negative value in case of error.
*/
int bt_l2cap_ecred_chan_reconfigure(struct bt_l2cap_chan **chans, uint16_t mtu);
/** @brief Connect L2CAP channel
*
* Connect L2CAP channel by PSM, once the connection is completed channel