b6cdf10310
We can get rid of the view pool for SDU segments :) We have to make the code slightly more complex :'( The basic idea is always giving the original SDU buffer to `conn.c` for it to pull ACL fragments from. In order to do this, we need to add the PDU headers just-in-time. `bt_l2cap_send_pdu()` does not add them before putting the PDU on the queue anymore. They are added by `l2cap_data_pull()` right before the data leaves `l2cap.c` for `conn.c`. We also have to inform `conn.c` "out of band" of the real L2CAP PDU size so it doesn't fragment across segment boundaries. This oob is the new `length` parameter to the `.pull()` method. This is the added complexity mentioned above. Since SDU segmentation concerns only LE-L2CAP, ISO and Classic L2CAP don't need this extra logic. Signed-off-by: Jonathan Rico <jonathan.rico@nordicsemi.no>
54 lines
1.7 KiB
C
54 lines
1.7 KiB
C
/* l2cap_br.c - L2CAP BREDR internal interface
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*
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* This is the only interface between l2cap.c and l2cap_br.c.
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*
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* Copyright (c) 2024 Nordic Semiconductor ASA
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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/* Initialize BR/EDR L2CAP signal layer */
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void bt_l2cap_br_init(void);
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/* Notify BR/EDR L2CAP channels about established new ACL connection */
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void bt_l2cap_br_connected(struct bt_conn *conn);
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/* Notify BR/EDR L2CAP channels about ACL disconnection*/
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void bt_l2cap_br_disconnected(struct bt_conn *conn);
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/* Lookup BR/EDR L2CAP channel by Receiver CID */
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struct bt_l2cap_chan *bt_l2cap_br_lookup_rx_cid(struct bt_conn *conn,
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uint16_t cid);
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/* Disconnects dynamic channel */
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int bt_l2cap_br_chan_disconnect(struct bt_l2cap_chan *chan);
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/* Make connection to peer psm server */
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int bt_l2cap_br_chan_connect(struct bt_conn *conn, struct bt_l2cap_chan *chan,
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uint16_t psm);
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/* Send packet data to connected peer */
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int bt_l2cap_br_chan_send(struct bt_l2cap_chan *chan, struct net_buf *buf);
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int bt_l2cap_br_chan_send_cb(struct bt_l2cap_chan *chan, struct net_buf *buf, bt_conn_tx_cb_t cb,
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void *user_data);
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/* Send a single PDU over a BR channel.
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* Used by e.g. SMP.
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*/
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int bt_l2cap_br_send_cb(struct bt_conn *conn, uint16_t cid, struct net_buf *buf,
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bt_conn_tx_cb_t cb, void *user_data);
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/*
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* Handle security level changed on link passing HCI status of performed
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* security procedure.
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*/
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void l2cap_br_encrypt_change(struct bt_conn *conn, uint8_t hci_status);
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/* Handle received data */
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void bt_l2cap_br_recv(struct bt_conn *conn, struct net_buf *buf);
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/* Pull HCI fragments from buffers intended for `conn` */
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struct net_buf *l2cap_br_data_pull(struct bt_conn *conn,
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size_t amount,
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size_t *length);
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