Bluetooth: Add configuration support for ERTM and Streaming mode

Add support to config_req and config_rsp to configure ERTM and Streaming
mode. If the remote device specifies ERTM or Streaming mode, then the
same mode is proposed. Otherwise ERTM or Basic mode is used. And in case
of a state 2 device, the remote device should propose the same mode. If
not, then the channel gets disconnected.

Signed-off-by: Gustavo F. Padovan <gustavo@las.ic.unicamp.br>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
static inline int l2cap_information_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
{
	struct l2cap_info_req *req = (struct l2cap_info_req *) data;
	u16 type;

	type = __le16_to_cpu(req->type);

	BT_DBG("type 0x%4.4x", type);

	if (type == L2CAP_IT_FEAT_MASK) {
		u8 buf[8];
		u32 feat_mask = l2cap_feat_mask;
		struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
		rsp->type   = cpu_to_le16(L2CAP_IT_FEAT_MASK);
		rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS);
		if (enable_ertm)
			feat_mask |= L2CAP_FEAT_ERTM;
		put_unaligned(cpu_to_le32(feat_mask), (__le32 *) rsp->data);
		l2cap_send_cmd(conn, cmd->ident,
					L2CAP_INFO_RSP, sizeof(buf), buf);
	} else if (type == L2CAP_IT_FIXED_CHAN) {
		u8 buf[12];
		struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
		rsp->type   = cpu_to_le16(L2CAP_IT_FIXED_CHAN);
		rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS);
		memcpy(buf + 4, l2cap_fixed_chan, 8);
		l2cap_send_cmd(conn, cmd->ident,
					L2CAP_INFO_RSP, sizeof(buf), buf);
	} else {
		struct l2cap_info_rsp rsp;
		rsp.type   = cpu_to_le16(type);
		rsp.result = cpu_to_le16(L2CAP_IR_NOTSUPP);
		l2cap_send_cmd(conn, cmd->ident,
					L2CAP_INFO_RSP, sizeof(rsp), &rsp);
	}

	return 0;
}

static inline int l2cap_information_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr *cmd, u8 *data)
{
	struct l2cap_info_req *req = (struct l2cap_info_req *) data;
	u16 type;

	type = __le16_to_cpu(req->type);

	BT_DBG("type 0x%4.4x", type);

	if (type == L2CAP_IT_FEAT_MASK) {
		u8 buf[8];
		u32 feat_mask = l2cap_feat_mask;
		struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
		rsp->type   = cpu_to_le16(L2CAP_IT_FEAT_MASK);
		rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS);
		if (enable_ertm)
			feat_mask |= L2CAP_FEAT_ERTM;
		put_unaligned(cpu_to_le32(feat_mask), (__le32 *) rsp->data);
		l2cap_send_cmd(conn, cmd->ident,
					L2CAP_INFO_RSP, sizeof(buf), buf);
	} else if (type == L2CAP_IT_FIXED_CHAN) {
		u8 buf[12];
		struct l2cap_info_rsp *rsp = (struct l2cap_info_rsp *) buf;
		rsp->type   = cpu_to_le16(L2CAP_IT_FIXED_CHAN);
		rsp->result = cpu_to_le16(L2CAP_IR_SUCCESS);
		memcpy(buf + 4, l2cap_fixed_chan, 8);
		l2cap_send_cmd(conn, cmd->ident,
					L2CAP_INFO_RSP, sizeof(buf), buf);
	} else {
		struct l2cap_info_rsp rsp;
		rsp.type   = cpu_to_le16(type);
		rsp.result = cpu_to_le16(L2CAP_IR_NOTSUPP);
		l2cap_send_cmd(conn, cmd->ident,
					L2CAP_INFO_RSP, sizeof(rsp), &rsp);
	}

	return 0;
}
