Hi Mat,
> The logical link confirm callback is executed when the AMP controller
> completes its logical link setup. During a channel move, a newly
> formed logical link allows a move responder to send a move channel
> response. A move initiator will send a move channel confirm. A
> failed logical link will end the channel move and send an appropriate
> response or confirm command indicating a failure.
>
> If the channel is being created on an AMP controller, L2CAP
> configuration is completed after the logical link is set up.
>
> Signed-off-by: Mat Martineau <mathewm@xxxxxxxxxxxxxx>
> ---
> net/bluetooth/l2cap_core.c | 124 ++++++++++++++++++++++++++++++++++++++++++---
> 1 file changed, 116 insertions(+), 8 deletions(-)
>
> diff --git a/net/bluetooth/l2cap_core.c b/net/bluetooth/l2cap_core.c
> index 69d43c9..0edc955 100644
> --- a/net/bluetooth/l2cap_core.c
> +++ b/net/bluetooth/l2cap_core.c
> @@ -3799,6 +3799,7 @@ static inline int l2cap_config_req(struct l2cap_conn *conn,
> goto unlock;
> }
>
> + chan->ident = cmd->ident;
> l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp);
> chan->num_conf_rsp++;
>
> @@ -4198,17 +4199,17 @@ static int l2cap_create_channel_req(struct l2cap_conn *conn,
> return 0;
> }
>
> -static void l2cap_send_move_chan_rsp(struct l2cap_conn *conn, u8 ident,
> - u16 icid, u16 result)
> +static void l2cap_send_move_chan_rsp(struct l2cap_chan *chan, u16 result)
> {
> struct l2cap_move_chan_rsp rsp;
>
> - BT_DBG("icid 0x%4.4x, result 0x%4.4x", icid, result);
> + BT_DBG("chan %p, result 0x%4.4x", chan, result);
>
> - rsp.icid = cpu_to_le16(icid);
> + rsp.icid = cpu_to_le16(chan->dcid);
> rsp.result = cpu_to_le16(result);
>
> - l2cap_send_cmd(conn, ident, L2CAP_MOVE_CHAN_RSP, sizeof(rsp), &rsp);
> + l2cap_send_cmd(chan->conn, chan->ident, L2CAP_MOVE_CHAN_RSP,
> + sizeof(rsp), &rsp);
> }
>
> static void l2cap_send_move_chan_cfm(struct l2cap_chan *chan, u16 result)
> @@ -4260,11 +4261,114 @@ static void __release_logical_link(struct l2cap_chan *chan)
> /* Placeholder - release the logical link */
> }
>
> +static void l2cap_logical_fail(struct l2cap_chan *chan)
> +{
> + /* Logical link setup failed */
> + if (chan->state != BT_CONNECTED) {
> + /* Create channel failure, disconnect */
> + l2cap_send_disconn_req(chan->conn, chan, ECONNRESET);
lets do this:
if (chan->state != BT_CONNECTED) {
...
return;
}
> + } else if (chan->move_role == L2CAP_MOVE_ROLE_RESPONDER) {
> + l2cap_move_revert(chan);
> + chan->move_role = L2CAP_MOVE_ROLE_NONE;
> + chan->move_state = L2CAP_MOVE_STABLE;
> + l2cap_send_move_chan_rsp(chan, L2CAP_MR_NOT_SUPP);
> + } else if (chan->move_role == L2CAP_MOVE_ROLE_INITIATOR) {
> + if (chan->move_state == L2CAP_MOVE_WAIT_LOGICAL_COMP ||
> + chan->move_state == L2CAP_MOVE_WAIT_LOGICAL_CFM) {
> + /* Remote has only sent pending or
> + * success responses, clean up
> + */
> + l2cap_move_revert(chan);
> + chan->move_role = L2CAP_MOVE_ROLE_NONE;
> + chan->move_state = L2CAP_MOVE_STABLE;
> + }
> +
> + /* Other amp move states imply that the move
> + * has already aborted
> + */
> + l2cap_send_move_chan_cfm(chan, L2CAP_MC_UNCONFIRMED);
> + }
And turn this into a switch statement.
> +
> + __release_logical_link(chan);
And leave this to the caller.
> +}
> +
> +static void l2cap_logical_finish_create(struct l2cap_chan *chan,
> + struct hci_chan *hchan)
> +{
> + struct l2cap_conf_rsp rsp;
> + u8 code;
> +
> + chan->hs_hcon = hchan->conn;
> + chan->hs_hcon->l2cap_data = chan->conn;
> +
> + code = l2cap_build_conf_rsp(chan, &rsp,
> + L2CAP_CONF_SUCCESS, 0);
> + l2cap_send_cmd(chan->conn, chan->ident, L2CAP_CONF_RSP, code,
> + &rsp);
> + set_bit(CONF_OUTPUT_DONE, &chan->conf_state);
> +
> + if (test_bit(CONF_INPUT_DONE, &chan->conf_state)) {
> + int err = 0;
> +
> + set_default_fcs(chan);
> +
> + err = l2cap_ertm_init(chan);
> + if (err < 0)
> + l2cap_send_disconn_req(chan->conn, chan, -err);
> + else
> + l2cap_chan_ready(chan);
> + }
> +}
> +
> +static void l2cap_logical_finish_move(struct l2cap_chan *chan,
> + struct hci_chan *hchan)
> +{
> + chan->hs_hcon = hchan->conn;
> + chan->hs_hcon->l2cap_data = chan->conn;
> +
> + BT_DBG("move_state %d", chan->move_state);
> +
> + switch (chan->move_state) {
> + case L2CAP_MOVE_WAIT_LOGICAL_COMP:
> + /* Move confirm will be sent after a success
> + * response is received
> + */
> + chan->move_state = L2CAP_MOVE_WAIT_RSP_SUCCESS;
> + break;
> + case L2CAP_MOVE_WAIT_LOGICAL_CFM:
> + if (test_bit(CONN_LOCAL_BUSY, &chan->conn_state)) {
> + chan->move_state = L2CAP_MOVE_WAIT_LOCAL_BUSY;
My brain just hurts from these nested if-else. A nested two switch does
not make it any better though. So we can leave it as this. Except the
statement below is used multiple places and we have a function for it.
> + } else if (chan->move_role == L2CAP_MOVE_ROLE_INITIATOR) {
> + chan->move_state = L2CAP_MOVE_WAIT_CONFIRM_RSP;
> + l2cap_send_move_chan_cfm(chan, L2CAP_MC_CONFIRMED);
> + } else if (chan->move_role == L2CAP_MOVE_ROLE_RESPONDER) {
> + chan->move_state = L2CAP_MOVE_WAIT_CONFIRM;
> + l2cap_send_move_chan_rsp(chan, L2CAP_MR_SUCCESS);
> + }
> + break;
> + default:
> + /* Move was not in expected state, free the channel */
> + __release_logical_link(chan);
> +
> + chan->move_state = L2CAP_MOVE_STABLE;
> + }
> +}
> +
> +/* Call with chan locked */
> static void l2cap_logical_cfm(struct l2cap_chan *chan, struct hci_chan *hchan,
> u8 status)
> {
> - /* Placeholder */
> - return;
> + BT_DBG("chan %p, hchan %p, status %d", chan, hchan, status);
> +
> + if (status) {
> + l2cap_logical_fail(chan);
I rather have a return here.
if (status) {
l2cap_logical_fail(chan);
__release_logical_link(chan);
return;
}
> + } else if (chan->state != BT_CONNECTED) {
> + /* Ignore logical link if channel is on BR/EDR */
> + if (chan->local_amp_id)
> + l2cap_logical_finish_create(chan, hchan);
> + } else {
> + l2cap_logical_finish_move(chan, hchan);
> + }
> }
>
> static inline int l2cap_move_channel_req(struct l2cap_conn *conn,
> @@ -4272,6 +4376,7 @@ static inline int l2cap_move_channel_req(struct l2cap_conn *conn,
> u16 cmd_len, void *data)
> {
> struct l2cap_move_chan_req *req = data;
> + struct l2cap_move_chan_rsp rsp;
> struct l2cap_chan *chan;
> u16 icid = 0;
> u16 result = L2CAP_MR_NOT_ALLOWED;
> @@ -4348,7 +4453,10 @@ static inline int l2cap_move_channel_req(struct l2cap_conn *conn,
> }
>
> send_move_response:
> - l2cap_send_move_chan_rsp(conn, cmd->ident, icid, result);
> + rsp.icid = cpu_to_le16(icid);
> + rsp.result = cpu_to_le16(result);
> + l2cap_send_cmd(conn, cmd->ident, L2CAP_MOVE_CHAN_RSP,
> + sizeof(rsp), &rsp);
>
> if (chan)
> l2cap_chan_unlock(chan);
While not part of this patch, I still dislike if (something) unlock
style. Please have that fixed as well.
Rest looks fine.
Regards
Marcel
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